From a359038b4bfc60211572950eefb0097810bacb74 Mon Sep 17 00:00:00 2001 From: "Sergey Semyonov (Serge)" Date: Tue, 1 Mar 2011 21:41:20 +0000 Subject: [PATCH] libpng 1.5.1 git-svn-id: svn://kolibrios.org@1897 a494cfbc-eb01-0410-851d-a64ba20cac60 --- programs/develop/libraries/cairo/Makefile | 129 +- programs/develop/libraries/cairo/config.h | 16 +- .../libraries/cairo/src/cairo-cff-subset.c | 2271 +++++++++ .../libraries/cairo/src/cairo-pdf-operators.c | 1475 ++++++ .../develop/libraries/cairo/src/cairo-png.c | 798 ++++ .../cairo/src/cairo-scaled-font-subsets.c | 1091 +++++ .../libraries/cairo/src/cairo-svg-surface.c | 2848 +++++++++++ .../cairo/src/cairo-truetype-subset.c | 1433 ++++++ .../cairo/src/cairo-type1-fallback.c | 887 ++++ .../libraries/cairo/src/cairo-type1-subset.c | 1431 ++++++ .../cairo/src/cairo-type3-glyph-surface.c | 563 +++ programs/develop/libraries/libpng/LICENSE | 111 + programs/develop/libraries/libpng/Makefile | 44 + programs/develop/libraries/libpng/config.h | 87 + .../libraries/libpng/libpng-manual.txt | 4136 ++++++++++++++++ programs/develop/libraries/libpng/png.c | 2362 +++++++++ programs/develop/libraries/libpng/png.h | 2280 +++++++++ programs/develop/libraries/libpng/pngconf.h | 632 +++ programs/develop/libraries/libpng/pngdebug.h | 157 + programs/develop/libraries/libpng/pngerror.c | 447 ++ programs/develop/libraries/libpng/pngget.c | 1032 ++++ programs/develop/libraries/libpng/pnginfo.h | 270 ++ .../develop/libraries/libpng/pnglibconf.h | 173 + programs/develop/libraries/libpng/pngmem.c | 658 +++ programs/develop/libraries/libpng/pngpread.c | 1854 ++++++++ programs/develop/libraries/libpng/pngpriv.h | 1235 +++++ programs/develop/libraries/libpng/pngread.c | 1466 ++++++ programs/develop/libraries/libpng/pngrio.c | 176 + programs/develop/libraries/libpng/pngrtran.c | 4224 +++++++++++++++++ programs/develop/libraries/libpng/pngrutil.c | 3616 ++++++++++++++ programs/develop/libraries/libpng/pngset.c | 1225 +++++ programs/develop/libraries/libpng/pngstruct.h | 308 ++ programs/develop/libraries/libpng/pngtrans.c | 723 +++ programs/develop/libraries/libpng/pngwio.c | 254 + programs/develop/libraries/libpng/pngwrite.c | 1605 +++++++ programs/develop/libraries/libpng/pngwtran.c | 631 +++ programs/develop/libraries/libpng/pngwutil.c | 2948 ++++++++++++ 37 files changed, 45530 insertions(+), 66 deletions(-) create mode 100644 programs/develop/libraries/cairo/src/cairo-cff-subset.c create mode 100644 programs/develop/libraries/cairo/src/cairo-pdf-operators.c create mode 100644 programs/develop/libraries/cairo/src/cairo-png.c create mode 100644 programs/develop/libraries/cairo/src/cairo-scaled-font-subsets.c create mode 100644 programs/develop/libraries/cairo/src/cairo-svg-surface.c create mode 100644 programs/develop/libraries/cairo/src/cairo-truetype-subset.c create mode 100644 programs/develop/libraries/cairo/src/cairo-type1-fallback.c create mode 100644 programs/develop/libraries/cairo/src/cairo-type1-subset.c create mode 100644 programs/develop/libraries/cairo/src/cairo-type3-glyph-surface.c create mode 100644 programs/develop/libraries/libpng/LICENSE create mode 100644 programs/develop/libraries/libpng/Makefile create mode 100644 programs/develop/libraries/libpng/config.h create mode 100644 programs/develop/libraries/libpng/libpng-manual.txt create mode 100644 programs/develop/libraries/libpng/png.c create mode 100644 programs/develop/libraries/libpng/png.h create mode 100644 programs/develop/libraries/libpng/pngconf.h create mode 100644 programs/develop/libraries/libpng/pngdebug.h create mode 100644 programs/develop/libraries/libpng/pngerror.c create mode 100644 programs/develop/libraries/libpng/pngget.c create mode 100644 programs/develop/libraries/libpng/pnginfo.h create mode 100644 programs/develop/libraries/libpng/pnglibconf.h create mode 100644 programs/develop/libraries/libpng/pngmem.c create mode 100644 programs/develop/libraries/libpng/pngpread.c create mode 100644 programs/develop/libraries/libpng/pngpriv.h create mode 100644 programs/develop/libraries/libpng/pngread.c create mode 100644 programs/develop/libraries/libpng/pngrio.c create mode 100644 programs/develop/libraries/libpng/pngrtran.c create mode 100644 programs/develop/libraries/libpng/pngrutil.c create mode 100644 programs/develop/libraries/libpng/pngset.c create mode 100644 programs/develop/libraries/libpng/pngstruct.h create mode 100644 programs/develop/libraries/libpng/pngtrans.c create mode 100644 programs/develop/libraries/libpng/pngwio.c create mode 100644 programs/develop/libraries/libpng/pngwrite.c create mode 100644 programs/develop/libraries/libpng/pngwtran.c create mode 100644 programs/develop/libraries/libpng/pngwutil.c diff --git a/programs/develop/libraries/cairo/Makefile b/programs/develop/libraries/cairo/Makefile index 2203daca50..bbbb7489eb 100644 --- a/programs/develop/libraries/cairo/Makefile +++ b/programs/develop/libraries/cairo/Makefile @@ -8,9 +8,9 @@ CFLAGS = -c -O2 -fomit-frame-pointer DEFINES = -DHAVE_CONFIG_H -DCAIRO_NO_MUTEX -U_WIN32 -U_MSC_VER -U__WIN32__ -INCLUDES = -I../pixman -I../newlib/include -I../newlib/include/sys +INCLUDES = -I../newlib/include -I../pixman -I../zlib -I../libpng -SOURCES = \ +CAIRO_SOURCES = \ cairo-analysis-surface.c \ cairo-arc.c \ cairo-array.c \ @@ -24,66 +24,79 @@ SOURCES = \ cairo-boxes.c \ cairo.c \ cairo-cache.c \ - cairo-clip.c \ - cairo-color.c \ - cairo-composite-rectangles.c \ - cairo-device.c \ - cairo-fixed.c \ - cairo-font-face.c \ - cairo-font-face-twin.c \ - cairo-font-face-twin-data.c \ - cairo-font-options.c \ - cairo-freelist.c \ - cairo-freed-pool.c \ - cairo-gstate.c \ - cairo-hash.c \ - cairo-hull.c \ - cairo-image-info.c \ - cairo-image-surface.c \ - cairo-lzw.c \ - cairo-matrix.c \ - cairo-recording-surface.c \ - cairo-misc.c \ - cairo-mutex.c \ - cairo-observer.c \ - cairo-output-stream.c \ - cairo-paginated-surface.c \ - cairo-path-bounds.c \ - cairo-path.c \ - cairo-path-fill.c \ - cairo-path-fixed.c \ - cairo-path-in-fill.c \ - cairo-path-stroke.c \ - cairo-pattern.c \ - cairo-pen.c \ - cairo-polygon.c \ - cairo-rectangle.c \ - cairo-rectangular-scan-converter.c \ - cairo-region.c \ - cairo-rtree.c \ - cairo-scaled-font.c \ - cairo-slope.c \ - cairo-spans.c \ - cairo-spline.c \ - cairo-stroke-style.c \ - cairo-surface.c \ - cairo-surface-fallback.c \ - cairo-surface-clipper.c \ - cairo-surface-offset.c \ - cairo-surface-snapshot.c \ - cairo-surface-subsurface.c \ - cairo-surface-wrapper.c \ - cairo-tor-scan-converter.c \ - cairo-toy-font-face.c \ - cairo-traps.c \ - cairo-unicode.c \ - cairo-user-font.c \ - cairo-version.c \ - cairo-wideint.c \ + cairo-clip.c \ + cairo-color.c \ + cairo-composite-rectangles.c \ + cairo-device.c \ + cairo-fixed.c \ + cairo-font-face.c \ + cairo-font-face-twin.c \ + cairo-font-face-twin-data.c \ + cairo-font-options.c \ + cairo-freelist.c \ + cairo-freed-pool.c \ + cairo-gstate.c \ + cairo-hash.c \ + cairo-hull.c \ + cairo-image-info.c \ + cairo-image-surface.c \ + cairo-lzw.c \ + cairo-matrix.c \ + cairo-recording-surface.c \ + cairo-misc.c \ + cairo-mutex.c \ + cairo-observer.c \ + cairo-output-stream.c \ + cairo-paginated-surface.c \ + cairo-path-bounds.c \ + cairo-path.c \ + cairo-path-fill.c \ + cairo-path-fixed.c \ + cairo-path-in-fill.c \ + cairo-path-stroke.c \ + cairo-pattern.c \ + cairo-pdf-operators.c \ + cairo-pen.c \ + cairo-png.c \ + cairo-polygon.c \ + cairo-rectangle.c \ + cairo-rectangular-scan-converter.c \ + cairo-region.c \ + cairo-rtree.c \ + cairo-scaled-font.c \ + cairo-slope.c \ + cairo-spans.c \ + cairo-spline.c \ + cairo-stroke-style.c \ + cairo-surface.c \ + cairo-surface-fallback.c \ + cairo-surface-clipper.c \ + cairo-surface-offset.c \ + cairo-surface-snapshot.c \ + cairo-surface-subsurface.c \ + cairo-surface-wrapper.c \ + cairo-svg-surface.c \ + cairo-tor-scan-converter.c \ + cairo-toy-font-face.c \ + cairo-traps.c \ + cairo-unicode.c \ + cairo-user-font.c \ + cairo-version.c \ + cairo-wideint.c \ $(NULL) +CAIRO_FONT = \ + cairo-cff-subset.c \ + cairo-scaled-font-subsets.c \ + cairo-truetype-subset.c \ + cairo-type1-fallback.c \ + cairo-type1-subset.c \ + cairo-type3-glyph-surface.c \ + $(NULL) + +SOURCES= $(CAIRO_SOURCES) $(CAIRO_FONT) OBJECTS = $(patsubst %.c, src/%.o, $(SOURCES)) diff --git a/programs/develop/libraries/cairo/config.h b/programs/develop/libraries/cairo/config.h index 65f7b4c794..1dfb65dd16 100644 --- a/programs/develop/libraries/cairo/config.h +++ b/programs/develop/libraries/cairo/config.h @@ -24,11 +24,13 @@ /* Define to 1 to enable cairo's cairo-script-interpreter feature */ //#define CAIRO_HAS_INTERPRETER 1 +#define CAIRO_NO_MUTEX 1 + /* Define to 1 to enable cairo's pthread feature */ -//#define CAIRO_HAS_PTHREAD 1 +/* #undef CAIRO_HAS_PTHREAD */ /* Define to 1 if we have full pthread support */ -//#define CAIRO_HAS_REAL_PTHREAD 1 +/* #undef CAIRO_HAS_REAL_PTHREAD */ /* Define to 1 if libspectre is available */ /* #undef CAIRO_HAS_SPECTRE */ @@ -40,7 +42,7 @@ /* #undef CAIRO_HAS_TEST_SURFACES */ /* Define to 1 to enable cairo's cairo-trace feature */ -//#define CAIRO_HAS_TRACE 1 +/* #undef CAIRO_HAS_TRACE */ /* Define to 1 to disable certain code paths that rely heavily on double precision floating-point calculation */ @@ -73,7 +75,7 @@ #define HAVE_DLFCN_H 1 /* Define to 1 if you have the `drand48' function. */ -//#define HAVE_DRAND48 1 +#define HAVE_DRAND48 1 /* Define to 1 if you have the `FcFini' function. */ /* #undef HAVE_FCFINI */ @@ -173,7 +175,7 @@ //#define HAVE_SCHED_H 1 /* Define to 1 if you have the header file. */ -//#define HAVE_SETJMP_H 1 +#define HAVE_SETJMP_H 1 /* Define to 1 if you have the header file. */ //#define HAVE_SIGNAL_H 1 @@ -342,7 +344,7 @@ #define X_DISPLAY_MISSING 1 /* Number of bits in a file offset, on hosts where this is settable. */ -#define _FILE_OFFSET_BITS 64 +/* #undef _FILE_OFFSET_BITS */ /* Define for large files, on AIX-style hosts. */ /* #undef _LARGE_FILES */ @@ -362,5 +364,3 @@ #ifndef __cplusplus /* #undef inline */ #endif - - diff --git a/programs/develop/libraries/cairo/src/cairo-cff-subset.c b/programs/develop/libraries/cairo/src/cairo-cff-subset.c new file mode 100644 index 0000000000..a4a434f77c --- /dev/null +++ b/programs/develop/libraries/cairo/src/cairo-cff-subset.c @@ -0,0 +1,2271 @@ +/* cairo - a vector graphics library with display and print output + * + * Copyright © 2006 Adrian Johnson + * + * This library is free software; you can redistribute it and/or + * modify it either under the terms of the GNU Lesser General Public + * License version 2.1 as published by the Free Software Foundation + * (the "LGPL") or, at your option, under the terms of the Mozilla + * Public License Version 1.1 (the "MPL"). If you do not alter this + * notice, a recipient may use your version of this file under either + * the MPL or the LGPL. + * + * You should have received a copy of the LGPL along with this library + * in the file COPYING-LGPL-2.1; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA + * You should have received a copy of the MPL along with this library + * in the file COPYING-MPL-1.1 + * + * The contents of this file are subject to the Mozilla Public License + * Version 1.1 (the "License"); you may not use this file except in + * compliance with the License. You may obtain a copy of the License at + * http://www.mozilla.org/MPL/ + * + * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY + * OF ANY KIND, either express or implied. See the LGPL or the MPL for + * the specific language governing rights and limitations. + * + * The Original Code is the cairo graphics library. + * + * The Initial Developer of the Original Code is Adrian Johnson. + * + * Contributor(s): + * Adrian Johnson + * Eugeniy Meshcheryakov + */ + +/* + * Useful links: + * http://www.adobe.com/devnet/font/pdfs/5176.CFF.pdf + */ + +#define _BSD_SOURCE /* for snprintf(), strdup() */ +#include "cairoint.h" +#include "cairo-error-private.h" + +#if CAIRO_HAS_FONT_SUBSET + +#include "cairo-scaled-font-subsets-private.h" +#include "cairo-truetype-subset-private.h" +#include + +/* CFF Dict Operators. If the high byte is 0 the command is encoded + * with a single byte. */ +#define BASEFONTNAME_OP 0x0c16 +#define CIDCOUNT_OP 0x0c22 +#define CHARSET_OP 0x000f +#define CHARSTRINGS_OP 0x0011 +#define COPYRIGHT_OP 0x0c00 +#define ENCODING_OP 0x0010 +#define FAMILYNAME_OP 0x0003 +#define FDARRAY_OP 0x0c24 +#define FDSELECT_OP 0x0c25 +#define FONTBBOX_OP 0x0005 +#define FONTNAME_OP 0x0c26 +#define FULLNAME_OP 0x0002 +#define LOCAL_SUB_OP 0x0013 +#define NOTICE_OP 0x0001 +#define POSTSCRIPT_OP 0x0c15 +#define PRIVATE_OP 0x0012 +#define ROS_OP 0x0c1e +#define UNIQUEID_OP 0x000d +#define VERSION_OP 0x0000 +#define WEIGHT_OP 0x0004 +#define XUID_OP 0x000e + +#define NUM_STD_STRINGS 391 + +typedef struct _cff_header { + uint8_t major; + uint8_t minor; + uint8_t header_size; + uint8_t offset_size; +} cff_header_t; + +typedef struct _cff_index_element { + cairo_bool_t is_copy; + unsigned char *data; + int length; +} cff_index_element_t; + +typedef struct _cff_dict_operator { + cairo_hash_entry_t base; + + unsigned short operator; + unsigned char *operand; + int operand_length; + int operand_offset; +} cff_dict_operator_t; + +typedef struct _cairo_cff_font { + + cairo_scaled_font_subset_t *scaled_font_subset; + const cairo_scaled_font_backend_t *backend; + + /* Font Data */ + unsigned char *data; + unsigned long data_length; + unsigned char *current_ptr; + unsigned char *data_end; + cff_header_t *header; + char *font_name; + char *ps_name; + cairo_hash_table_t *top_dict; + cairo_hash_table_t *private_dict; + cairo_array_t strings_index; + cairo_array_t charstrings_index; + cairo_array_t global_sub_index; + cairo_array_t local_sub_index; + int num_glyphs; + cairo_bool_t is_cid; + int units_per_em; + + /* CID Font Data */ + int *fdselect; + unsigned int num_fontdicts; + cairo_hash_table_t **fd_dict; + cairo_hash_table_t **fd_private_dict; + cairo_array_t *fd_local_sub_index; + + /* Subsetted Font Data */ + char *subset_font_name; + cairo_array_t charstrings_subset_index; + cairo_array_t strings_subset_index; + int *fdselect_subset; + unsigned int num_subset_fontdicts; + int *fd_subset_map; + int *private_dict_offset; + cairo_array_t output; + + /* Subset Metrics */ + int *widths; + int x_min, y_min, x_max, y_max; + int ascent, descent; + +} cairo_cff_font_t; + +/* Encoded integer using maximum sized encoding. This is required for + * operands that are later modified after encoding. */ +static unsigned char * +encode_integer_max (unsigned char *p, int i) +{ + *p++ = 29; + *p++ = i >> 24; + *p++ = (i >> 16) & 0xff; + *p++ = (i >> 8) & 0xff; + *p++ = i & 0xff; + return p; +} + +static unsigned char * +encode_integer (unsigned char *p, int i) +{ + if (i >= -107 && i <= 107) { + *p++ = i + 139; + } else if (i >= 108 && i <= 1131) { + i -= 108; + *p++ = (i >> 8)+ 247; + *p++ = i & 0xff; + } else if (i >= -1131 && i <= -108) { + i = -i - 108; + *p++ = (i >> 8)+ 251; + *p++ = i & 0xff; + } else if (i >= -32768 && i <= 32767) { + *p++ = 28; + *p++ = (i >> 8) & 0xff; + *p++ = i & 0xff; + } else { + p = encode_integer_max (p, i); + } + return p; +} + +static unsigned char * +decode_integer (unsigned char *p, int *integer) +{ + if (*p == 28) { + *integer = (int)(p[1]<<8 | p[2]); + p += 3; + } else if (*p == 29) { + *integer = (int)((p[1] << 24) | (p[2] << 16) | (p[3] << 8) | p[4]); + p += 5; + } else if (*p >= 32 && *p <= 246) { + *integer = *p++ - 139; + } else if (*p <= 250) { + *integer = (p[0] - 247) * 256 + p[1] + 108; + p += 2; + } else if (*p <= 254) { + *integer = -(p[0] - 251) * 256 - p[1] - 108; + p += 2; + } else { + *integer = 0; + p += 1; + } + return p; +} + +static unsigned char * +decode_operator (unsigned char *p, unsigned short *operator) +{ + unsigned short op = 0; + + op = *p++; + if (op == 12) { + op <<= 8; + op |= *p++; + } + *operator = op; + return p; +} + +/* return 0 if not an operand */ +static int +operand_length (unsigned char *p) +{ + unsigned char *begin = p; + + if (*p == 28) + return 3; + + if (*p == 29) + return 5; + + if (*p >= 32 && *p <= 246) + return 1; + + if (*p >= 247 && *p <= 254) + return 2; + + if (*p == 30) { + while ((*p & 0x0f) != 0x0f) + p++; + return p - begin + 1; + } + + return 0; +} + +static unsigned char * +encode_index_offset (unsigned char *p, int offset_size, unsigned long offset) +{ + while (--offset_size >= 0) { + p[offset_size] = (unsigned char) (offset & 0xff); + offset >>= 8; + } + return p + offset_size; +} + +static unsigned long +decode_index_offset(unsigned char *p, int off_size) +{ + unsigned long offset = 0; + + while (off_size-- > 0) + offset = offset*256 + *p++; + return offset; +} + +static void +cff_index_init (cairo_array_t *index) +{ + _cairo_array_init (index, sizeof (cff_index_element_t)); +} + +static cairo_int_status_t +cff_index_read (cairo_array_t *index, unsigned char **ptr, unsigned char *end_ptr) +{ + cff_index_element_t element; + unsigned char *data, *p; + cairo_status_t status; + int offset_size, count, start, i; + int end = 0; + + p = *ptr; + if (p + 2 > end_ptr) + return CAIRO_INT_STATUS_UNSUPPORTED; + count = be16_to_cpu( *((uint16_t *)p) ); + p += 2; + if (count > 0) { + offset_size = *p++; + if (p + (count + 1)*offset_size > end_ptr) + return CAIRO_INT_STATUS_UNSUPPORTED; + data = p + offset_size*(count + 1) - 1; + start = decode_index_offset (p, offset_size); + p += offset_size; + for (i = 0; i < count; i++) { + end = decode_index_offset (p, offset_size); + p += offset_size; + if (p > end_ptr) + return CAIRO_INT_STATUS_UNSUPPORTED; + element.length = end - start; + element.is_copy = FALSE; + element.data = data + start; + status = _cairo_array_append (index, &element); + if (unlikely (status)) + return status; + start = end; + } + p = data + end; + } + *ptr = p; + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_status_t +cff_index_write (cairo_array_t *index, cairo_array_t *output) +{ + int offset_size; + int offset; + int num_elem; + int i; + cff_index_element_t *element; + uint16_t count; + unsigned char buf[5]; + cairo_status_t status; + + num_elem = _cairo_array_num_elements (index); + count = cpu_to_be16 ((uint16_t) num_elem); + status = _cairo_array_append_multiple (output, &count, 2); + if (unlikely (status)) + return status; + + if (num_elem == 0) + return CAIRO_STATUS_SUCCESS; + + /* Find maximum offset to determine offset size */ + offset = 1; + for (i = 0; i < num_elem; i++) { + element = _cairo_array_index (index, i); + offset += element->length; + } + if (offset < 0x100) + offset_size = 1; + else if (offset < 0x10000) + offset_size = 2; + else if (offset < 0x1000000) + offset_size = 3; + else + offset_size = 4; + + buf[0] = (unsigned char) offset_size; + status = _cairo_array_append (output, buf); + if (unlikely (status)) + return status; + + offset = 1; + encode_index_offset (buf, offset_size, offset); + status = _cairo_array_append_multiple (output, buf, offset_size); + if (unlikely (status)) + return status; + + for (i = 0; i < num_elem; i++) { + element = _cairo_array_index (index, i); + offset += element->length; + encode_index_offset (buf, offset_size, offset); + status = _cairo_array_append_multiple (output, buf, offset_size); + if (unlikely (status)) + return status; + } + + for (i = 0; i < num_elem; i++) { + element = _cairo_array_index (index, i); + status = _cairo_array_append_multiple (output, + element->data, + element->length); + if (unlikely (status)) + return status; + } + return CAIRO_STATUS_SUCCESS; +} + +static cairo_status_t +cff_index_append (cairo_array_t *index, unsigned char *object , int length) +{ + cff_index_element_t element; + + element.length = length; + element.is_copy = FALSE; + element.data = object; + + return _cairo_array_append (index, &element); +} + +static cairo_status_t +cff_index_append_copy (cairo_array_t *index, + const unsigned char *object, + unsigned int length) +{ + cff_index_element_t element; + cairo_status_t status; + + element.length = length; + element.is_copy = TRUE; + element.data = malloc (element.length); + if (unlikely (element.data == NULL)) + return _cairo_error (CAIRO_STATUS_NO_MEMORY); + + memcpy (element.data, object, element.length); + + status = _cairo_array_append (index, &element); + if (unlikely (status)) { + free (element.data); + return status; + } + + return CAIRO_STATUS_SUCCESS; +} + +static void +cff_index_fini (cairo_array_t *index) +{ + cff_index_element_t *element; + int i; + + for (i = 0; i < _cairo_array_num_elements (index); i++) { + element = _cairo_array_index (index, i); + if (element->is_copy) + free (element->data); + } + _cairo_array_fini (index); +} + +static cairo_bool_t +_cairo_cff_dict_equal (const void *key_a, const void *key_b) +{ + const cff_dict_operator_t *op_a = key_a; + const cff_dict_operator_t *op_b = key_b; + + return op_a->operator == op_b->operator; +} + +static cairo_status_t +cff_dict_init (cairo_hash_table_t **dict) +{ + *dict = _cairo_hash_table_create (_cairo_cff_dict_equal); + if (unlikely (*dict == NULL)) + return _cairo_error (CAIRO_STATUS_NO_MEMORY); + + return CAIRO_STATUS_SUCCESS; +} + +static void +_cairo_dict_init_key (cff_dict_operator_t *key, int operator) +{ + key->base.hash = (unsigned long) operator; + key->operator = operator; +} + +static cairo_status_t +cff_dict_create_operator (int operator, + unsigned char *operand, + int size, + cff_dict_operator_t **out) +{ + cff_dict_operator_t *op; + + op = malloc (sizeof (cff_dict_operator_t)); + if (unlikely (op == NULL)) + return _cairo_error (CAIRO_STATUS_NO_MEMORY); + + _cairo_dict_init_key (op, operator); + op->operand = malloc (size); + if (unlikely (op->operand == NULL)) { + free (op); + return _cairo_error (CAIRO_STATUS_NO_MEMORY); + } + + memcpy (op->operand, operand, size); + op->operand_length = size; + op->operand_offset = -1; + + *out = op; + return CAIRO_STATUS_SUCCESS; +} + +static cairo_status_t +cff_dict_read (cairo_hash_table_t *dict, unsigned char *p, int dict_size) +{ + unsigned char *end; + cairo_array_t operands; + cff_dict_operator_t *op; + unsigned short operator; + cairo_status_t status = CAIRO_STATUS_SUCCESS; + int size; + + end = p + dict_size; + _cairo_array_init (&operands, 1); + while (p < end) { + size = operand_length (p); + if (size != 0) { + status = _cairo_array_append_multiple (&operands, p, size); + if (unlikely (status)) + goto fail; + + p += size; + } else { + p = decode_operator (p, &operator); + status = cff_dict_create_operator (operator, + _cairo_array_index (&operands, 0), + _cairo_array_num_elements (&operands), + &op); + if (unlikely (status)) + goto fail; + + status = _cairo_hash_table_insert (dict, &op->base); + if (unlikely (status)) + goto fail; + + _cairo_array_truncate (&operands, 0); + } + } + +fail: + _cairo_array_fini (&operands); + + return status; +} + +static void +cff_dict_remove (cairo_hash_table_t *dict, unsigned short operator) +{ + cff_dict_operator_t key, *op; + + _cairo_dict_init_key (&key, operator); + op = _cairo_hash_table_lookup (dict, &key.base); + if (op != NULL) { + free (op->operand); + _cairo_hash_table_remove (dict, (cairo_hash_entry_t *) op); + free (op); + } +} + +static unsigned char * +cff_dict_get_operands (cairo_hash_table_t *dict, + unsigned short operator, + int *size) +{ + cff_dict_operator_t key, *op; + + _cairo_dict_init_key (&key, operator); + op = _cairo_hash_table_lookup (dict, &key.base); + if (op != NULL) { + *size = op->operand_length; + return op->operand; + } + + return NULL; +} + +static cairo_status_t +cff_dict_set_operands (cairo_hash_table_t *dict, + unsigned short operator, + unsigned char *operand, + int size) +{ + cff_dict_operator_t key, *op; + cairo_status_t status; + + _cairo_dict_init_key (&key, operator); + op = _cairo_hash_table_lookup (dict, &key.base); + if (op != NULL) { + free (op->operand); + op->operand = malloc (size); + if (unlikely (op->operand == NULL)) + return _cairo_error (CAIRO_STATUS_NO_MEMORY); + + memcpy (op->operand, operand, size); + op->operand_length = size; + } + else + { + status = cff_dict_create_operator (operator, operand, size, &op); + if (unlikely (status)) + return status; + + status = _cairo_hash_table_insert (dict, &op->base); + if (unlikely (status)) + return status; + } + + return CAIRO_STATUS_SUCCESS; +} + +static int +cff_dict_get_location (cairo_hash_table_t *dict, + unsigned short operator, + int *size) +{ + cff_dict_operator_t key, *op; + + _cairo_dict_init_key (&key, operator); + op = _cairo_hash_table_lookup (dict, &key.base); + if (op != NULL) { + *size = op->operand_length; + return op->operand_offset; + } + + return -1; +} + +typedef struct _dict_write_info { + cairo_array_t *output; + cairo_status_t status; +} dict_write_info_t; + +static void +cairo_dict_write_operator (cff_dict_operator_t *op, dict_write_info_t *write_info) +{ + unsigned char data; + + op->operand_offset = _cairo_array_num_elements (write_info->output); + write_info->status = _cairo_array_append_multiple (write_info->output, op->operand, op->operand_length); + if (write_info->status) + return; + + if (op->operator & 0xff00) { + data = op->operator >> 8; + write_info->status = _cairo_array_append (write_info->output, &data); + if (write_info->status) + return; + } + data = op->operator & 0xff; + write_info->status = _cairo_array_append (write_info->output, &data); +} + +static void +_cairo_dict_collect (void *entry, void *closure) +{ + dict_write_info_t *write_info = closure; + cff_dict_operator_t *op = entry; + + if (write_info->status) + return; + + /* The ROS operator is handled separately in cff_dict_write() */ + if (op->operator != ROS_OP) + cairo_dict_write_operator (op, write_info); +} + +static cairo_status_t +cff_dict_write (cairo_hash_table_t *dict, cairo_array_t *output) +{ + dict_write_info_t write_info; + cff_dict_operator_t key, *op; + + write_info.output = output; + write_info.status = CAIRO_STATUS_SUCCESS; + + /* The CFF specification requires that the Top Dict of CID fonts + * begin with the ROS operator. */ + _cairo_dict_init_key (&key, ROS_OP); + op = _cairo_hash_table_lookup (dict, &key.base); + if (op != NULL) + cairo_dict_write_operator (op, &write_info); + + _cairo_hash_table_foreach (dict, _cairo_dict_collect, &write_info); + + return write_info.status; +} + +static void +_cff_dict_entry_pluck (void *_entry, void *dict) +{ + cff_dict_operator_t *entry = _entry; + + _cairo_hash_table_remove (dict, &entry->base); + free (entry->operand); + free (entry); +} + +static void +cff_dict_fini (cairo_hash_table_t *dict) +{ + _cairo_hash_table_foreach (dict, _cff_dict_entry_pluck, dict); + _cairo_hash_table_destroy (dict); +} + +static cairo_int_status_t +cairo_cff_font_read_header (cairo_cff_font_t *font) +{ + if (font->data_length < sizeof (cff_header_t)) + return CAIRO_INT_STATUS_UNSUPPORTED; + + font->header = (cff_header_t *) font->data; + font->current_ptr = font->data + font->header->header_size; + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_int_status_t +cairo_cff_font_read_name (cairo_cff_font_t *font) +{ + cairo_array_t index; + cairo_int_status_t status; + + /* The original font name is not used in the subset. Read the name + * index to skip over it. */ + cff_index_init (&index); + status = cff_index_read (&index, &font->current_ptr, font->data_end); + cff_index_fini (&index); + + return status; +} + +static cairo_int_status_t +cairo_cff_font_read_private_dict (cairo_cff_font_t *font, + cairo_hash_table_t *private_dict, + cairo_array_t *local_sub_index, + unsigned char *ptr, + int size) +{ + cairo_int_status_t status; + unsigned char buf[10]; + unsigned char *end_buf; + int offset; + int i; + unsigned char *operand; + unsigned char *p; + + status = cff_dict_read (private_dict, ptr, size); + if (unlikely (status)) + return status; + + operand = cff_dict_get_operands (private_dict, LOCAL_SUB_OP, &i); + if (operand) { + decode_integer (operand, &offset); + p = ptr + offset; + status = cff_index_read (local_sub_index, &p, font->data_end); + if (unlikely (status)) + return status; + + /* Use maximum sized encoding to reserve space for later modification. */ + end_buf = encode_integer_max (buf, 0); + status = cff_dict_set_operands (private_dict, LOCAL_SUB_OP, buf, end_buf - buf); + if (unlikely (status)) + return status; + } + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_int_status_t +cairo_cff_font_read_fdselect (cairo_cff_font_t *font, unsigned char *p) +{ + int type, num_ranges, first, last, fd, i, j; + + font->fdselect = calloc (font->num_glyphs, sizeof (int)); + if (unlikely (font->fdselect == NULL)) + return _cairo_error (CAIRO_STATUS_NO_MEMORY); + + type = *p++; + if (type == 0) + { + for (i = 0; i < font->num_glyphs; i++) + font->fdselect[i] = *p++; + } else if (type == 3) { + num_ranges = be16_to_cpu( *((uint16_t *)p) ); + p += 2; + for (i = 0; i < num_ranges; i++) + { + first = be16_to_cpu( *((uint16_t *)p) ); + p += 2; + fd = *p++; + last = be16_to_cpu( *((uint16_t *)p) ); + for (j = first; j < last; j++) + font->fdselect[j] = fd; + } + } else { + return CAIRO_INT_STATUS_UNSUPPORTED; + } + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_int_status_t +cairo_cff_font_read_cid_fontdict (cairo_cff_font_t *font, unsigned char *ptr) +{ + cairo_array_t index; + cff_index_element_t *element; + unsigned int i; + int size; + unsigned char *operand; + int offset; + cairo_int_status_t status; + unsigned char buf[100]; + unsigned char *end_buf; + + cff_index_init (&index); + status = cff_index_read (&index, &ptr, font->data_end); + if (unlikely (status)) + goto fail; + + font->num_fontdicts = _cairo_array_num_elements (&index); + + font->fd_dict = calloc (sizeof (cairo_hash_table_t *), font->num_fontdicts); + if (unlikely (font->fd_dict == NULL)) { + status = _cairo_error (CAIRO_STATUS_NO_MEMORY); + goto fail; + } + + font->fd_private_dict = calloc (sizeof (cairo_hash_table_t *), font->num_fontdicts); + if (unlikely (font->fd_private_dict == NULL)) { + status = _cairo_error (CAIRO_STATUS_NO_MEMORY); + goto fail; + } + + font->fd_local_sub_index = calloc (sizeof (cairo_array_t), font->num_fontdicts); + if (unlikely (font->fd_local_sub_index == NULL)) { + status = _cairo_error (CAIRO_STATUS_NO_MEMORY); + goto fail; + } + + for (i = 0; i < font->num_fontdicts; i++) { + status = cff_dict_init (&font->fd_dict[i]); + if (unlikely (status)) + goto fail; + + element = _cairo_array_index (&index, i); + status = cff_dict_read (font->fd_dict[i], element->data, element->length); + if (unlikely (status)) + goto fail; + + operand = cff_dict_get_operands (font->fd_dict[i], PRIVATE_OP, &size); + if (operand == NULL) { + status = CAIRO_INT_STATUS_UNSUPPORTED; + goto fail; + } + operand = decode_integer (operand, &size); + decode_integer (operand, &offset); + status = cff_dict_init (&font->fd_private_dict[i]); + if (unlikely (status)) + goto fail; + + cff_index_init (&font->fd_local_sub_index[i]); + status = cairo_cff_font_read_private_dict (font, + font->fd_private_dict[i], + &font->fd_local_sub_index[i], + font->data + offset, + size); + if (unlikely (status)) + goto fail; + + /* Set integer operand to max value to use max size encoding to reserve + * space for any value later */ + end_buf = encode_integer_max (buf, 0); + end_buf = encode_integer_max (end_buf, 0); + status = cff_dict_set_operands (font->fd_dict[i], PRIVATE_OP, buf, end_buf - buf); + if (unlikely (status)) + goto fail; + } + + return CAIRO_STATUS_SUCCESS; + +fail: + cff_index_fini (&index); + + return status; +} + +static cairo_int_status_t +cairo_cff_font_read_top_dict (cairo_cff_font_t *font) +{ + cairo_array_t index; + cff_index_element_t *element; + unsigned char buf[20]; + unsigned char *end_buf; + unsigned char *operand; + cairo_int_status_t status; + unsigned char *p; + int size; + int offset; + + cff_index_init (&index); + status = cff_index_read (&index, &font->current_ptr, font->data_end); + if (unlikely (status)) + goto fail; + + element = _cairo_array_index (&index, 0); + status = cff_dict_read (font->top_dict, element->data, element->length); + if (unlikely (status)) + goto fail; + + if (cff_dict_get_operands (font->top_dict, ROS_OP, &size) != NULL) + font->is_cid = TRUE; + else + font->is_cid = FALSE; + + operand = cff_dict_get_operands (font->top_dict, CHARSTRINGS_OP, &size); + decode_integer (operand, &offset); + p = font->data + offset; + status = cff_index_read (&font->charstrings_index, &p, font->data_end); + if (unlikely (status)) + goto fail; + font->num_glyphs = _cairo_array_num_elements (&font->charstrings_index); + + if (font->is_cid) { + operand = cff_dict_get_operands (font->top_dict, FDSELECT_OP, &size); + decode_integer (operand, &offset); + status = cairo_cff_font_read_fdselect (font, font->data + offset); + if (unlikely (status)) + goto fail; + + operand = cff_dict_get_operands (font->top_dict, FDARRAY_OP, &size); + decode_integer (operand, &offset); + status = cairo_cff_font_read_cid_fontdict (font, font->data + offset); + if (unlikely (status)) + goto fail; + } else { + operand = cff_dict_get_operands (font->top_dict, PRIVATE_OP, &size); + operand = decode_integer (operand, &size); + decode_integer (operand, &offset); + status = cairo_cff_font_read_private_dict (font, + font->private_dict, + &font->local_sub_index, + font->data + offset, + size); + if (unlikely (status)) + goto fail; + } + + /* Use maximum sized encoding to reserve space for later modification. */ + end_buf = encode_integer_max (buf, 0); + status = cff_dict_set_operands (font->top_dict, + CHARSTRINGS_OP, buf, end_buf - buf); + if (unlikely (status)) + goto fail; + + status = cff_dict_set_operands (font->top_dict, + FDSELECT_OP, buf, end_buf - buf); + if (unlikely (status)) + goto fail; + + status = cff_dict_set_operands (font->top_dict, + FDARRAY_OP, buf, end_buf - buf); + if (unlikely (status)) + goto fail; + + status = cff_dict_set_operands (font->top_dict, + CHARSET_OP, buf, end_buf - buf); + if (unlikely (status)) + goto fail; + + cff_dict_remove (font->top_dict, ENCODING_OP); + cff_dict_remove (font->top_dict, PRIVATE_OP); + + /* Remove the unique identifier operators as the subsetted font is + * not the same is the original font. */ + cff_dict_remove (font->top_dict, UNIQUEID_OP); + cff_dict_remove (font->top_dict, XUID_OP); + +fail: + cff_index_fini (&index); + + return status; +} + +static cairo_int_status_t +cairo_cff_font_read_strings (cairo_cff_font_t *font) +{ + return cff_index_read (&font->strings_index, &font->current_ptr, font->data_end); +} + +static cairo_int_status_t +cairo_cff_font_read_global_subroutines (cairo_cff_font_t *font) +{ + return cff_index_read (&font->global_sub_index, &font->current_ptr, font->data_end); +} + +typedef cairo_int_status_t +(*font_read_t) (cairo_cff_font_t *font); + +static const font_read_t font_read_funcs[] = { + cairo_cff_font_read_header, + cairo_cff_font_read_name, + cairo_cff_font_read_top_dict, + cairo_cff_font_read_strings, + cairo_cff_font_read_global_subroutines, +}; + +static cairo_int_status_t +cairo_cff_font_read_font (cairo_cff_font_t *font) +{ + cairo_int_status_t status; + unsigned int i; + + for (i = 0; i < ARRAY_LENGTH (font_read_funcs); i++) { + status = font_read_funcs[i] (font); + if (unlikely (status)) + return status; + } + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_status_t +cairo_cff_font_set_ros_strings (cairo_cff_font_t *font) +{ + cairo_status_t status; + unsigned char buf[30]; + unsigned char *p; + int sid1, sid2; + const char *registry = "Adobe"; + const char *ordering = "Identity"; + + sid1 = NUM_STD_STRINGS + _cairo_array_num_elements (&font->strings_subset_index); + status = cff_index_append_copy (&font->strings_subset_index, + (unsigned char *)registry, + strlen(registry)); + if (unlikely (status)) + return status; + + sid2 = NUM_STD_STRINGS + _cairo_array_num_elements (&font->strings_subset_index); + status = cff_index_append_copy (&font->strings_subset_index, + (unsigned char *)ordering, + strlen(ordering)); + if (unlikely (status)) + return status; + + p = encode_integer (buf, sid1); + p = encode_integer (p, sid2); + p = encode_integer (p, 0); + status = cff_dict_set_operands (font->top_dict, ROS_OP, buf, p - buf); + if (unlikely (status)) + return status; + + p = encode_integer (buf, font->scaled_font_subset->num_glyphs); + status = cff_dict_set_operands (font->top_dict, CIDCOUNT_OP, buf, p - buf); + if (unlikely (status)) + return status; + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_status_t +cairo_cff_font_subset_dict_string(cairo_cff_font_t *font, + cairo_hash_table_t *dict, + int operator) +{ + int size; + unsigned char *p; + int sid; + unsigned char buf[100]; + cff_index_element_t *element; + cairo_status_t status; + + p = cff_dict_get_operands (dict, operator, &size); + if (!p) + return CAIRO_STATUS_SUCCESS; + + decode_integer (p, &sid); + if (sid < NUM_STD_STRINGS) + return CAIRO_STATUS_SUCCESS; + + element = _cairo_array_index (&font->strings_index, sid - NUM_STD_STRINGS); + sid = NUM_STD_STRINGS + _cairo_array_num_elements (&font->strings_subset_index); + status = cff_index_append (&font->strings_subset_index, element->data, element->length); + if (unlikely (status)) + return status; + + p = encode_integer (buf, sid); + status = cff_dict_set_operands (dict, operator, buf, p - buf); + if (unlikely (status)) + return status; + + return CAIRO_STATUS_SUCCESS; +} + +static const int dict_strings[] = { + VERSION_OP, + NOTICE_OP, + COPYRIGHT_OP, + FULLNAME_OP, + FAMILYNAME_OP, + WEIGHT_OP, + POSTSCRIPT_OP, + BASEFONTNAME_OP, + FONTNAME_OP, +}; + +static cairo_status_t +cairo_cff_font_subset_dict_strings (cairo_cff_font_t *font, + cairo_hash_table_t *dict) +{ + cairo_status_t status; + unsigned int i; + + for (i = 0; i < ARRAY_LENGTH (dict_strings); i++) { + status = cairo_cff_font_subset_dict_string (font, dict, dict_strings[i]); + if (unlikely (status)) + return status; + } + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_status_t +cairo_cff_font_subset_charstrings (cairo_cff_font_t *font) +{ + cff_index_element_t *element; + unsigned int i; + cairo_status_t status; + + for (i = 0; i < font->scaled_font_subset->num_glyphs; i++) { + element = _cairo_array_index (&font->charstrings_index, + font->scaled_font_subset->glyphs[i]); + status = cff_index_append (&font->charstrings_subset_index, + element->data, + element->length); + if (unlikely (status)) + return status; + } + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_status_t +cairo_cff_font_subset_fontdict (cairo_cff_font_t *font) +{ + unsigned int i; + int fd; + int *reverse_map; + + font->fdselect_subset = calloc (font->scaled_font_subset->num_glyphs, + sizeof (int)); + if (unlikely (font->fdselect_subset == NULL)) + return _cairo_error (CAIRO_STATUS_NO_MEMORY); + + font->fd_subset_map = calloc (font->num_fontdicts, sizeof (int)); + if (unlikely (font->fd_subset_map == NULL)) + return _cairo_error (CAIRO_STATUS_NO_MEMORY); + + font->private_dict_offset = calloc (font->num_fontdicts, sizeof (int)); + if (unlikely (font->private_dict_offset == NULL)) + return _cairo_error (CAIRO_STATUS_NO_MEMORY); + + reverse_map = calloc (font->num_fontdicts, sizeof (int)); + if (unlikely (reverse_map == NULL)) + return _cairo_error (CAIRO_STATUS_NO_MEMORY); + + for (i = 0; i < font->num_fontdicts; i++) + reverse_map[i] = -1; + + font->num_subset_fontdicts = 0; + for (i = 0; i < font->scaled_font_subset->num_glyphs; i++) { + fd = font->fdselect[font->scaled_font_subset->glyphs[i]]; + if (reverse_map[fd] < 0) { + font->fd_subset_map[font->num_subset_fontdicts] = fd; + reverse_map[fd] = font->num_subset_fontdicts++; + } + font->fdselect_subset[i] = reverse_map[fd]; + } + + free (reverse_map); + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_status_t +cairo_cff_font_create_cid_fontdict (cairo_cff_font_t *font) +{ + unsigned char buf[100]; + unsigned char *end_buf; + cairo_status_t status; + + font->num_fontdicts = 1; + font->fd_dict = malloc (sizeof (cairo_hash_table_t *)); + if (unlikely (font->fd_dict == NULL)) + return _cairo_error (CAIRO_STATUS_NO_MEMORY); + + if (cff_dict_init (&font->fd_dict[0])) { + free (font->fd_dict); + font->fd_dict = NULL; + font->num_fontdicts = 0; + return _cairo_error (CAIRO_STATUS_NO_MEMORY); + } + + font->fd_subset_map = malloc (sizeof (int)); + if (unlikely (font->fd_subset_map == NULL)) + return _cairo_error (CAIRO_STATUS_NO_MEMORY); + + font->private_dict_offset = malloc (sizeof (int)); + if (unlikely (font->private_dict_offset == NULL)) + return _cairo_error (CAIRO_STATUS_NO_MEMORY); + + font->fd_subset_map[0] = 0; + font->num_subset_fontdicts = 1; + + /* Set integer operand to max value to use max size encoding to reserve + * space for any value later */ + end_buf = encode_integer_max (buf, 0); + end_buf = encode_integer_max (end_buf, 0); + status = cff_dict_set_operands (font->fd_dict[0], PRIVATE_OP, buf, end_buf - buf); + if (unlikely (status)) + return status; + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_status_t +cairo_cff_font_subset_strings (cairo_cff_font_t *font) +{ + cairo_status_t status; + unsigned int i; + + status = cairo_cff_font_subset_dict_strings (font, font->top_dict); + if (unlikely (status)) + return status; + + if (font->is_cid) { + for (i = 0; i < font->num_subset_fontdicts; i++) { + status = cairo_cff_font_subset_dict_strings (font, font->fd_dict[font->fd_subset_map[i]]); + if (unlikely (status)) + return status; + + status = cairo_cff_font_subset_dict_strings (font, font->fd_private_dict[font->fd_subset_map[i]]); + if (unlikely (status)) + return status; + } + } else { + status = cairo_cff_font_subset_dict_strings (font, font->private_dict); + } + + return status; +} + +static cairo_status_t +cairo_cff_font_subset_font (cairo_cff_font_t *font) +{ + cairo_status_t status; + + status = cairo_cff_font_set_ros_strings (font); + if (unlikely (status)) + return status; + + status = cairo_cff_font_subset_charstrings (font); + if (unlikely (status)) + return status; + + if (font->is_cid) + status = cairo_cff_font_subset_fontdict (font); + else + status = cairo_cff_font_create_cid_fontdict (font); + if (unlikely (status)) + return status; + + status = cairo_cff_font_subset_strings (font); + if (unlikely (status)) + return status; + + return status; +} + +/* Set the operand of the specified operator in the (already written) + * top dict to point to the current position in the output + * array. Operands updated with this function must have previously + * been encoded with the 5-byte (max) integer encoding. */ +static void +cairo_cff_font_set_topdict_operator_to_cur_pos (cairo_cff_font_t *font, + int operator) +{ + int cur_pos; + int offset; + int size; + unsigned char buf[10]; + unsigned char *buf_end; + unsigned char *op_ptr; + + cur_pos = _cairo_array_num_elements (&font->output); + buf_end = encode_integer_max (buf, cur_pos); + offset = cff_dict_get_location (font->top_dict, operator, &size); + assert (offset > 0); + op_ptr = _cairo_array_index (&font->output, offset); + memcpy (op_ptr, buf, buf_end - buf); +} + +static cairo_status_t +cairo_cff_font_write_header (cairo_cff_font_t *font) +{ + return _cairo_array_append_multiple (&font->output, + font->header, + font->header->header_size); +} + +static cairo_status_t +cairo_cff_font_write_name (cairo_cff_font_t *font) +{ + cairo_status_t status = CAIRO_STATUS_SUCCESS; + cairo_array_t index; + + cff_index_init (&index); + + status = cff_index_append_copy (&index, + (unsigned char *) font->subset_font_name, + strlen(font->subset_font_name)); + if (unlikely (status)) + goto FAIL; + + status = cff_index_write (&index, &font->output); + if (unlikely (status)) + goto FAIL; + +FAIL: + cff_index_fini (&index); + + return status; +} + +static cairo_status_t +cairo_cff_font_write_top_dict (cairo_cff_font_t *font) +{ + uint16_t count; + unsigned char buf[10]; + unsigned char *p; + int offset_index; + int dict_start, dict_size; + int offset_size = 4; + cairo_status_t status; + + /* Write an index containing the top dict */ + + count = cpu_to_be16 (1); + status = _cairo_array_append_multiple (&font->output, &count, 2); + if (unlikely (status)) + return status; + buf[0] = offset_size; + status = _cairo_array_append (&font->output, buf); + if (unlikely (status)) + return status; + encode_index_offset (buf, offset_size, 1); + status = _cairo_array_append_multiple (&font->output, buf, offset_size); + if (unlikely (status)) + return status; + + /* Reserve space for last element of offset array and update after + * dict is written */ + offset_index = _cairo_array_num_elements (&font->output); + status = _cairo_array_append_multiple (&font->output, buf, offset_size); + if (unlikely (status)) + return status; + + dict_start = _cairo_array_num_elements (&font->output); + status = cff_dict_write (font->top_dict, &font->output); + if (unlikely (status)) + return status; + dict_size = _cairo_array_num_elements (&font->output) - dict_start; + + encode_index_offset (buf, offset_size, dict_size + 1); + p = _cairo_array_index (&font->output, offset_index); + memcpy (p, buf, offset_size); + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_status_t +cairo_cff_font_write_strings (cairo_cff_font_t *font) +{ + return cff_index_write (&font->strings_subset_index, &font->output); +} + +static cairo_status_t +cairo_cff_font_write_global_subrs (cairo_cff_font_t *font) +{ + return cff_index_write (&font->global_sub_index, &font->output); +} + +static cairo_status_t +cairo_cff_font_write_fdselect (cairo_cff_font_t *font) +{ + unsigned char data; + unsigned int i; + cairo_int_status_t status; + + cairo_cff_font_set_topdict_operator_to_cur_pos (font, FDSELECT_OP); + + if (font->is_cid) { + data = 0; + status = _cairo_array_append (&font->output, &data); + if (unlikely (status)) + return status; + + for (i = 0; i < font->scaled_font_subset->num_glyphs; i++) { + data = font->fdselect_subset[i]; + status = _cairo_array_append (&font->output, &data); + if (unlikely (status)) + return status; + } + } else { + unsigned char byte; + uint16_t word; + + status = _cairo_array_grow_by (&font->output, 9); + if (unlikely (status)) + return status; + + byte = 3; + status = _cairo_array_append (&font->output, &byte); + assert (status == CAIRO_STATUS_SUCCESS); + + word = cpu_to_be16 (1); + status = _cairo_array_append_multiple (&font->output, &word, 2); + assert (status == CAIRO_STATUS_SUCCESS); + + word = cpu_to_be16 (0); + status = _cairo_array_append_multiple (&font->output, &word, 2); + assert (status == CAIRO_STATUS_SUCCESS); + + byte = 0; + status = _cairo_array_append (&font->output, &byte); + assert (status == CAIRO_STATUS_SUCCESS); + + word = cpu_to_be16 (font->scaled_font_subset->num_glyphs); + status = _cairo_array_append_multiple (&font->output, &word, 2); + assert (status == CAIRO_STATUS_SUCCESS); + } + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_status_t +cairo_cff_font_write_charset (cairo_cff_font_t *font) +{ + unsigned char byte; + uint16_t word; + cairo_status_t status; + + cairo_cff_font_set_topdict_operator_to_cur_pos (font, CHARSET_OP); + status = _cairo_array_grow_by (&font->output, 5); + if (unlikely (status)) + return status; + + byte = 2; + status = _cairo_array_append (&font->output, &byte); + assert (status == CAIRO_STATUS_SUCCESS); + + word = cpu_to_be16 (1); + status = _cairo_array_append_multiple (&font->output, &word, 2); + assert (status == CAIRO_STATUS_SUCCESS); + + word = cpu_to_be16 (font->scaled_font_subset->num_glyphs - 2); + status = _cairo_array_append_multiple (&font->output, &word, 2); + assert (status == CAIRO_STATUS_SUCCESS); + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_status_t +cairo_cff_font_write_charstrings (cairo_cff_font_t *font) +{ + cairo_cff_font_set_topdict_operator_to_cur_pos (font, CHARSTRINGS_OP); + + return cff_index_write (&font->charstrings_subset_index, &font->output); +} + +static cairo_status_t +cairo_cff_font_write_cid_fontdict (cairo_cff_font_t *font) +{ + unsigned int i; + cairo_int_status_t status; + uint32_t *offset_array; + int offset_base; + uint16_t count; + uint8_t offset_size = 4; + + cairo_cff_font_set_topdict_operator_to_cur_pos (font, FDARRAY_OP); + count = cpu_to_be16 (font->num_subset_fontdicts); + status = _cairo_array_append_multiple (&font->output, &count, sizeof (uint16_t)); + if (unlikely (status)) + return status; + status = _cairo_array_append (&font->output, &offset_size); + if (unlikely (status)) + return status; + status = _cairo_array_allocate (&font->output, + (font->num_subset_fontdicts + 1)*offset_size, + (void **) &offset_array); + if (unlikely (status)) + return status; + offset_base = _cairo_array_num_elements (&font->output) - 1; + *offset_array++ = cpu_to_be32(1); + for (i = 0; i < font->num_subset_fontdicts; i++) { + status = cff_dict_write (font->fd_dict[font->fd_subset_map[i]], + &font->output); + if (unlikely (status)) + return status; + *offset_array++ = cpu_to_be32(_cairo_array_num_elements (&font->output) - offset_base); + } + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_status_t +cairo_cff_font_write_private_dict (cairo_cff_font_t *font, + int dict_num, + cairo_hash_table_t *parent_dict, + cairo_hash_table_t *private_dict) +{ + int offset; + int size; + unsigned char buf[10]; + unsigned char *buf_end; + unsigned char *p; + cairo_status_t status; + + /* Write private dict and update offset and size in top dict */ + font->private_dict_offset[dict_num] = _cairo_array_num_elements (&font->output); + status = cff_dict_write (private_dict, &font->output); + if (unlikely (status)) + return status; + + size = _cairo_array_num_elements (&font->output) - font->private_dict_offset[dict_num]; + /* private entry has two operands - size and offset */ + buf_end = encode_integer_max (buf, size); + buf_end = encode_integer_max (buf_end, font->private_dict_offset[dict_num]); + offset = cff_dict_get_location (parent_dict, PRIVATE_OP, &size); + assert (offset > 0); + p = _cairo_array_index (&font->output, offset); + memcpy (p, buf, buf_end - buf); + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_status_t +cairo_cff_font_write_local_sub (cairo_cff_font_t *font, + int dict_num, + cairo_hash_table_t *private_dict, + cairo_array_t *local_sub_index) +{ + int offset; + int size; + unsigned char buf[10]; + unsigned char *buf_end; + unsigned char *p; + cairo_status_t status; + + if (_cairo_array_num_elements (local_sub_index) > 0) { + /* Write local subroutines and update offset in private + * dict. Local subroutines offset is relative to start of + * private dict */ + offset = _cairo_array_num_elements (&font->output) - font->private_dict_offset[dict_num]; + buf_end = encode_integer_max (buf, offset); + offset = cff_dict_get_location (private_dict, LOCAL_SUB_OP, &size); + assert (offset > 0); + p = _cairo_array_index (&font->output, offset); + memcpy (p, buf, buf_end - buf); + status = cff_index_write (local_sub_index, &font->output); + if (unlikely (status)) + return status; + } + + return CAIRO_STATUS_SUCCESS; +} + + +static cairo_status_t +cairo_cff_font_write_cid_private_dict_and_local_sub (cairo_cff_font_t *font) +{ + unsigned int i; + cairo_int_status_t status; + + if (font->is_cid) { + for (i = 0; i < font->num_subset_fontdicts; i++) { + status = cairo_cff_font_write_private_dict ( + font, + i, + font->fd_dict[font->fd_subset_map[i]], + font->fd_private_dict[font->fd_subset_map[i]]); + if (unlikely (status)) + return status; + } + + for (i = 0; i < font->num_subset_fontdicts; i++) { + status = cairo_cff_font_write_local_sub ( + font, + i, + font->fd_private_dict[font->fd_subset_map[i]], + &font->fd_local_sub_index[font->fd_subset_map[i]]); + if (unlikely (status)) + return status; + } + } else { + status = cairo_cff_font_write_private_dict (font, + 0, + font->fd_dict[0], + font->private_dict); + if (unlikely (status)) + return status; + + status = cairo_cff_font_write_local_sub (font, + 0, + font->private_dict, + &font->local_sub_index); + if (unlikely (status)) + return status; + } + + return CAIRO_STATUS_SUCCESS; +} + +typedef cairo_status_t +(*font_write_t) (cairo_cff_font_t *font); + +static const font_write_t font_write_funcs[] = { + cairo_cff_font_write_header, + cairo_cff_font_write_name, + cairo_cff_font_write_top_dict, + cairo_cff_font_write_strings, + cairo_cff_font_write_global_subrs, + cairo_cff_font_write_charset, + cairo_cff_font_write_fdselect, + cairo_cff_font_write_charstrings, + cairo_cff_font_write_cid_fontdict, + cairo_cff_font_write_cid_private_dict_and_local_sub, +}; + +static cairo_status_t +cairo_cff_font_write_subset (cairo_cff_font_t *font) +{ + cairo_int_status_t status; + unsigned int i; + + for (i = 0; i < ARRAY_LENGTH (font_write_funcs); i++) { + status = font_write_funcs[i] (font); + if (unlikely (status)) + return status; + } + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_int_status_t +cairo_cff_font_generate (cairo_cff_font_t *font, + const char **data, + unsigned long *length) +{ + cairo_int_status_t status; + + status = cairo_cff_font_read_font (font); + if (unlikely (status)) + return status; + + status = cairo_cff_font_subset_font (font); + if (unlikely (status)) + return status; + + status = cairo_cff_font_write_subset (font); + if (unlikely (status)) + return status; + + *data = _cairo_array_index (&font->output, 0); + *length = _cairo_array_num_elements (&font->output); + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_int_status_t +cairo_cff_font_create_set_widths (cairo_cff_font_t *font) +{ + unsigned long size; + unsigned long long_entry_size; + unsigned long short_entry_size; + unsigned int i; + tt_hhea_t hhea; + int num_hmetrics; + unsigned char buf[10]; + int glyph_index; + cairo_int_status_t status; + + size = sizeof (tt_hhea_t); + status = font->backend->load_truetype_table (font->scaled_font_subset->scaled_font, + TT_TAG_hhea, 0, + (unsigned char*) &hhea, &size); + if (unlikely (status)) + return status; + num_hmetrics = be16_to_cpu (hhea.num_hmetrics); + + for (i = 1; i < font->scaled_font_subset->num_glyphs; i++) { + glyph_index = font->scaled_font_subset->glyphs[i]; + long_entry_size = 2 * sizeof (int16_t); + short_entry_size = sizeof (int16_t); + if (glyph_index < num_hmetrics) { + status = font->backend->load_truetype_table (font->scaled_font_subset->scaled_font, + TT_TAG_hmtx, + glyph_index * long_entry_size, + buf, &short_entry_size); + if (unlikely (status)) + return status; + } + else + { + status = font->backend->load_truetype_table (font->scaled_font_subset->scaled_font, + TT_TAG_hmtx, + (num_hmetrics - 1) * long_entry_size, + buf, &short_entry_size); + if (unlikely (status)) + return status; + } + font->widths[i] = be16_to_cpu (*((int16_t*)buf)); + } + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_int_status_t +_cairo_cff_font_create (cairo_scaled_font_subset_t *scaled_font_subset, + cairo_cff_font_t **font_return, + const char *subset_name) +{ + const cairo_scaled_font_backend_t *backend; + cairo_status_t status; + cairo_cff_font_t *font; + tt_head_t head; + tt_hhea_t hhea; + unsigned long size, data_length; + + backend = scaled_font_subset->scaled_font->backend; + if (!backend->load_truetype_table) + return CAIRO_INT_STATUS_UNSUPPORTED; + + data_length = 0; + status = backend->load_truetype_table( scaled_font_subset->scaled_font, + TT_TAG_CFF, 0, NULL, &data_length); + if (unlikely (status)) + return status; + + size = sizeof (tt_head_t); + status = backend->load_truetype_table (scaled_font_subset->scaled_font, + TT_TAG_head, 0, + (unsigned char *) &head, &size); + if (unlikely (status)) + return status; + + size = sizeof (tt_hhea_t); + status = backend->load_truetype_table (scaled_font_subset->scaled_font, + TT_TAG_hhea, 0, + (unsigned char *) &hhea, &size); + if (unlikely (status)) + return status; + + size = 0; + status = backend->load_truetype_table (scaled_font_subset->scaled_font, + TT_TAG_hmtx, 0, NULL, &size); + if (unlikely (status)) + return status; + + font = malloc (sizeof (cairo_cff_font_t)); + if (unlikely (font == NULL)) + return _cairo_error (CAIRO_STATUS_NO_MEMORY); + + font->backend = backend; + font->scaled_font_subset = scaled_font_subset; + + _cairo_array_init (&font->output, sizeof (char)); + status = _cairo_array_grow_by (&font->output, 4096); + if (unlikely (status)) + goto fail2; + + font->subset_font_name = strdup (subset_name); + if (unlikely (font->subset_font_name == NULL)) { + status = _cairo_error (CAIRO_STATUS_NO_MEMORY); + goto fail2; + } + font->x_min = (int16_t) be16_to_cpu (head.x_min); + font->y_min = (int16_t) be16_to_cpu (head.y_min); + font->x_max = (int16_t) be16_to_cpu (head.x_max); + font->y_max = (int16_t) be16_to_cpu (head.y_max); + font->ascent = (int16_t) be16_to_cpu (hhea.ascender); + font->descent = (int16_t) be16_to_cpu (hhea.descender); + font->units_per_em = (int16_t) be16_to_cpu (head.units_per_em); + if (font->units_per_em == 0) + font->units_per_em = 1000; + + font->font_name = NULL; + status = _cairo_truetype_read_font_name (scaled_font_subset->scaled_font, + &font->ps_name, + &font->font_name); + if (_cairo_status_is_error (status)) + goto fail3; + + /* If the PS name is not found, create a CairoFont-x-y name. */ + if (font->ps_name == NULL) { + font->ps_name = malloc (30); + if (unlikely (font->ps_name == NULL)) { + status = _cairo_error (CAIRO_STATUS_NO_MEMORY); + goto fail3; + } + + snprintf(font->ps_name, 30, "CairoFont-%u-%u", + scaled_font_subset->font_id, + scaled_font_subset->subset_id); + } + + font->widths = calloc (font->scaled_font_subset->num_glyphs, sizeof (int)); + if (unlikely (font->widths == NULL)) { + status = _cairo_error (CAIRO_STATUS_NO_MEMORY); + goto fail4; + } + + status = cairo_cff_font_create_set_widths (font); + if (unlikely (status)) + goto fail5; + + font->data_length = data_length; + font->data = malloc (data_length); + if (unlikely (font->data == NULL)) { + status = _cairo_error (CAIRO_STATUS_NO_MEMORY); + goto fail5; + } + status = font->backend->load_truetype_table ( font->scaled_font_subset->scaled_font, + TT_TAG_CFF, 0, font->data, + &font->data_length); + if (unlikely (status)) + goto fail6; + + font->data_end = font->data + font->data_length; + + status = cff_dict_init (&font->top_dict); + if (unlikely (status)) + goto fail6; + + status = cff_dict_init (&font->private_dict); + if (unlikely (status)) + goto fail7; + + cff_index_init (&font->strings_index); + cff_index_init (&font->charstrings_index); + cff_index_init (&font->global_sub_index); + cff_index_init (&font->local_sub_index); + cff_index_init (&font->charstrings_subset_index); + cff_index_init (&font->strings_subset_index); + font->fdselect = NULL; + font->fd_dict = NULL; + font->fd_private_dict = NULL; + font->fd_local_sub_index = NULL; + font->fdselect_subset = NULL; + font->fd_subset_map = NULL; + font->private_dict_offset = NULL; + + *font_return = font; + + return CAIRO_STATUS_SUCCESS; + +fail7: + _cairo_hash_table_destroy (font->top_dict); +fail6: + free (font->data); +fail5: + free (font->widths); +fail4: + if (font->font_name) + free (font->font_name); +fail3: + free (font->subset_font_name); +fail2: + _cairo_array_fini (&font->output); + free (font); + + return status; +} + +static void +cairo_cff_font_destroy (cairo_cff_font_t *font) +{ + unsigned int i; + + free (font->widths); + if (font->font_name) + free (font->font_name); + free (font->ps_name); + free (font->subset_font_name); + _cairo_array_fini (&font->output); + cff_dict_fini (font->top_dict); + cff_dict_fini (font->private_dict); + cff_index_fini (&font->strings_index); + cff_index_fini (&font->charstrings_index); + cff_index_fini (&font->global_sub_index); + cff_index_fini (&font->local_sub_index); + cff_index_fini (&font->charstrings_subset_index); + cff_index_fini (&font->strings_subset_index); + + /* If we bailed out early as a result of an error some of the + * following cairo_cff_font_t members may still be NULL */ + if (font->fd_dict) { + for (i = 0; i < font->num_fontdicts; i++) { + if (font->fd_dict[i]) + cff_dict_fini (font->fd_dict[i]); + } + free (font->fd_dict); + } + if (font->fd_subset_map) + free (font->fd_subset_map); + if (font->private_dict_offset) + free (font->private_dict_offset); + + if (font->is_cid) { + if (font->fdselect) + free (font->fdselect); + if (font->fdselect_subset) + free (font->fdselect_subset); + if (font->fd_private_dict) { + for (i = 0; i < font->num_fontdicts; i++) { + if (font->fd_private_dict[i]) + cff_dict_fini (font->fd_private_dict[i]); + } + free (font->fd_private_dict); + } + if (font->fd_local_sub_index) { + for (i = 0; i < font->num_fontdicts; i++) + cff_index_fini (&font->fd_local_sub_index[i]); + free (font->fd_local_sub_index); + } + } + + if (font->data) + free (font->data); + + free (font); +} + +cairo_status_t +_cairo_cff_subset_init (cairo_cff_subset_t *cff_subset, + const char *subset_name, + cairo_scaled_font_subset_t *font_subset) +{ + cairo_cff_font_t *font = NULL; /* squelch bogus compiler warning */ + cairo_status_t status; + const char *data = NULL; /* squelch bogus compiler warning */ + unsigned long length = 0; /* squelch bogus compiler warning */ + unsigned int i; + + status = _cairo_cff_font_create (font_subset, &font, subset_name); + if (unlikely (status)) + return status; + + status = cairo_cff_font_generate (font, &data, &length); + if (unlikely (status)) + goto fail1; + + cff_subset->ps_name = strdup (font->ps_name); + if (unlikely (cff_subset->ps_name == NULL)) { + status = _cairo_error (CAIRO_STATUS_NO_MEMORY); + goto fail1; + } + + if (font->font_name) { + cff_subset->font_name = strdup (font->font_name); + if (cff_subset->font_name == NULL) { + status = _cairo_error (CAIRO_STATUS_NO_MEMORY); + goto fail2; + } + } else { + cff_subset->font_name = NULL; + } + + cff_subset->widths = calloc (sizeof (double), font->scaled_font_subset->num_glyphs); + if (unlikely (cff_subset->widths == NULL)) { + status = _cairo_error (CAIRO_STATUS_NO_MEMORY); + goto fail3; + } + for (i = 0; i < font->scaled_font_subset->num_glyphs; i++) + cff_subset->widths[i] = (double)font->widths[i]/font->units_per_em; + + cff_subset->x_min = (double)font->x_min/font->units_per_em; + cff_subset->y_min = (double)font->y_min/font->units_per_em; + cff_subset->x_max = (double)font->x_max/font->units_per_em; + cff_subset->y_max = (double)font->y_max/font->units_per_em; + cff_subset->ascent = (double)font->ascent/font->units_per_em; + cff_subset->descent = (double)font->descent/font->units_per_em; + + cff_subset->data = malloc (length); + if (unlikely (cff_subset->data == NULL)) { + status = _cairo_error (CAIRO_STATUS_NO_MEMORY); + goto fail4; + } + + memcpy (cff_subset->data, data, length); + cff_subset->data_length = length; + + cairo_cff_font_destroy (font); + + return CAIRO_STATUS_SUCCESS; + + fail4: + free (cff_subset->widths); + fail3: + if (cff_subset->font_name) + free (cff_subset->font_name); + fail2: + free (cff_subset->ps_name); + fail1: + cairo_cff_font_destroy (font); + + return status; +} + +void +_cairo_cff_subset_fini (cairo_cff_subset_t *subset) +{ + free (subset->ps_name); + if (subset->font_name) + free (subset->font_name); + free (subset->widths); + free (subset->data); +} + +static cairo_int_status_t +_cairo_cff_font_fallback_create (cairo_scaled_font_subset_t *scaled_font_subset, + cairo_cff_font_t **font_return, + const char *subset_name) +{ + cairo_status_t status; + cairo_cff_font_t *font; + + font = malloc (sizeof (cairo_cff_font_t)); + if (unlikely (font == NULL)) + return _cairo_error (CAIRO_STATUS_NO_MEMORY); + + font->backend = NULL; + font->scaled_font_subset = scaled_font_subset; + + _cairo_array_init (&font->output, sizeof (char)); + status = _cairo_array_grow_by (&font->output, 4096); + if (unlikely (status)) + goto fail1; + + font->subset_font_name = strdup (subset_name); + if (unlikely (font->subset_font_name == NULL)) { + status = _cairo_error (CAIRO_STATUS_NO_MEMORY); + goto fail1; + } + + font->ps_name = strdup (subset_name); + if (unlikely (font->ps_name == NULL)) { + status = _cairo_error (CAIRO_STATUS_NO_MEMORY); + goto fail2; + } + font->font_name = NULL; + + font->x_min = 0; + font->y_min = 0; + font->x_max = 0; + font->y_max = 0; + font->ascent = 0; + font->descent = 0; + + font->widths = calloc (font->scaled_font_subset->num_glyphs, sizeof (int)); + if (unlikely (font->widths == NULL)) { + status = _cairo_error (CAIRO_STATUS_NO_MEMORY); + goto fail3; + } + + font->data_length = 0; + font->data = NULL; + font->data_end = NULL; + + status = cff_dict_init (&font->top_dict); + if (unlikely (status)) + goto fail4; + + status = cff_dict_init (&font->private_dict); + if (unlikely (status)) + goto fail5; + + cff_index_init (&font->strings_index); + cff_index_init (&font->charstrings_index); + cff_index_init (&font->global_sub_index); + cff_index_init (&font->local_sub_index); + cff_index_init (&font->charstrings_subset_index); + cff_index_init (&font->strings_subset_index); + font->fdselect = NULL; + font->fd_dict = NULL; + font->fd_private_dict = NULL; + font->fd_local_sub_index = NULL; + font->fdselect_subset = NULL; + font->fd_subset_map = NULL; + font->private_dict_offset = NULL; + + *font_return = font; + + return CAIRO_STATUS_SUCCESS; + +fail5: + _cairo_hash_table_destroy (font->top_dict); +fail4: + free (font->widths); +fail3: + if (font->font_name) + free (font->font_name); + free (font->ps_name); +fail2: + free (font->subset_font_name); +fail1: + _cairo_array_fini (&font->output); + free (font); + return status; +} + +static cairo_int_status_t +cairo_cff_font_fallback_generate (cairo_cff_font_t *font, + cairo_type2_charstrings_t *type2_subset, + const char **data, + unsigned long *length) +{ + cairo_int_status_t status; + cff_header_t header; + cairo_array_t *charstring; + unsigned char buf[40]; + unsigned char *end_buf; + unsigned int i; + + /* Create header */ + header.major = 1; + header.minor = 0; + header.header_size = 4; + header.offset_size = 4; + font->header = &header; + + /* Create Top Dict */ + font->is_cid = FALSE; + end_buf = encode_integer (buf, type2_subset->x_min); + end_buf = encode_integer (end_buf, type2_subset->y_min); + end_buf = encode_integer (end_buf, type2_subset->x_max); + end_buf = encode_integer (end_buf, type2_subset->y_max); + status = cff_dict_set_operands (font->top_dict, + FONTBBOX_OP, buf, end_buf - buf); + if (unlikely (status)) + return status; + + end_buf = encode_integer_max (buf, 0); + status = cff_dict_set_operands (font->top_dict, + CHARSTRINGS_OP, buf, end_buf - buf); + if (unlikely (status)) + return status; + + status = cff_dict_set_operands (font->top_dict, + FDSELECT_OP, buf, end_buf - buf); + if (unlikely (status)) + return status; + + status = cff_dict_set_operands (font->top_dict, + FDARRAY_OP, buf, end_buf - buf); + if (unlikely (status)) + return status; + + status = cff_dict_set_operands (font->top_dict, + CHARSET_OP, buf, end_buf - buf); + if (unlikely (status)) + return status; + + status = cairo_cff_font_set_ros_strings (font); + if (unlikely (status)) + return status; + + /* Create CID FD dictionary */ + status = cairo_cff_font_create_cid_fontdict (font); + if (unlikely (status)) + return status; + + /* Create charstrings */ + for (i = 0; i < font->scaled_font_subset->num_glyphs; i++) { + charstring = _cairo_array_index(&type2_subset->charstrings, i); + + status = cff_index_append (&font->charstrings_subset_index, + _cairo_array_index (charstring, 0), + _cairo_array_num_elements (charstring)); + + if (unlikely (status)) + return status; + } + + status = cairo_cff_font_write_subset (font); + if (unlikely (status)) + return status; + + *data = _cairo_array_index (&font->output, 0); + *length = _cairo_array_num_elements (&font->output); + + return CAIRO_STATUS_SUCCESS; +} + +cairo_status_t +_cairo_cff_fallback_init (cairo_cff_subset_t *cff_subset, + const char *subset_name, + cairo_scaled_font_subset_t *font_subset) +{ + cairo_cff_font_t *font = NULL; /* squelch bogus compiler warning */ + cairo_status_t status; + const char *data = NULL; /* squelch bogus compiler warning */ + unsigned long length = 0; /* squelch bogus compiler warning */ + unsigned int i; + cairo_type2_charstrings_t type2_subset; + + status = _cairo_cff_font_fallback_create (font_subset, &font, subset_name); + if (unlikely (status)) + return status; + + status = _cairo_type2_charstrings_init (&type2_subset, font_subset); + if (unlikely (status)) + goto fail1; + + status = cairo_cff_font_fallback_generate (font, &type2_subset, &data, &length); + if (unlikely (status)) + goto fail2; + + cff_subset->font_name = NULL; + cff_subset->ps_name = strdup (font->ps_name); + if (unlikely (cff_subset->ps_name == NULL)) { + status = _cairo_error (CAIRO_STATUS_NO_MEMORY); + goto fail2; + } + + cff_subset->widths = calloc (sizeof (double), font->scaled_font_subset->num_glyphs); + if (unlikely (cff_subset->widths == NULL)) { + status = _cairo_error (CAIRO_STATUS_NO_MEMORY); + goto fail3; + } + + for (i = 0; i < font->scaled_font_subset->num_glyphs; i++) + cff_subset->widths[i] = (double)type2_subset.widths[i]/1000; + + cff_subset->x_min = (double)type2_subset.x_min/1000; + cff_subset->y_min = (double)type2_subset.y_min/1000; + cff_subset->x_max = (double)type2_subset.x_max/1000; + cff_subset->y_max = (double)type2_subset.y_max/1000; + cff_subset->ascent = (double)type2_subset.y_max/1000; + cff_subset->descent = (double)type2_subset.y_min/1000; + + cff_subset->data = malloc (length); + if (unlikely (cff_subset->data == NULL)) { + status = _cairo_error (CAIRO_STATUS_NO_MEMORY); + goto fail4; + } + + memcpy (cff_subset->data, data, length); + cff_subset->data_length = length; + cff_subset->data_length = length; + + _cairo_type2_charstrings_fini (&type2_subset); + cairo_cff_font_destroy (font); + + return CAIRO_STATUS_SUCCESS; + + fail4: + free (cff_subset->widths); + fail3: + free (cff_subset->ps_name); + fail2: + _cairo_type2_charstrings_fini (&type2_subset); + fail1: + cairo_cff_font_destroy (font); + + return status; +} + +void +_cairo_cff_fallback_fini (cairo_cff_subset_t *subset) +{ + free (subset->ps_name); + free (subset->widths); + free (subset->data); +} + +#endif /* CAIRO_HAS_FONT_SUBSET */ diff --git a/programs/develop/libraries/cairo/src/cairo-pdf-operators.c b/programs/develop/libraries/cairo/src/cairo-pdf-operators.c new file mode 100644 index 0000000000..8d7a97d64c --- /dev/null +++ b/programs/develop/libraries/cairo/src/cairo-pdf-operators.c @@ -0,0 +1,1475 @@ +/* -*- Mode: c; tab-width: 8; c-basic-offset: 4; indent-tabs-mode: t; -*- */ +/* cairo - a vector graphics library with display and print output + * + * Copyright © 2004 Red Hat, Inc + * Copyright © 2006 Red Hat, Inc + * Copyright © 2007, 2008 Adrian Johnson + * + * This library is free software; you can redistribute it and/or + * modify it either under the terms of the GNU Lesser General Public + * License version 2.1 as published by the Free Software Foundation + * (the "LGPL") or, at your option, under the terms of the Mozilla + * Public License Version 1.1 (the "MPL"). If you do not alter this + * notice, a recipient may use your version of this file under either + * the MPL or the LGPL. + * + * You should have received a copy of the LGPL along with this library + * in the file COPYING-LGPL-2.1; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA + * You should have received a copy of the MPL along with this library + * in the file COPYING-MPL-1.1 + * + * The contents of this file are subject to the Mozilla Public License + * Version 1.1 (the "License"); you may not use this file except in + * compliance with the License. You may obtain a copy of the License at + * http://www.mozilla.org/MPL/ + * + * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY + * OF ANY KIND, either express or implied. See the LGPL or the MPL for + * the specific language governing rights and limitations. + * + * The Original Code is the cairo graphics library. + * + * The Initial Developer of the Original Code is University of Southern + * California. + * + * Contributor(s): + * Kristian Høgsberg + * Carl Worth + * Adrian Johnson + */ + +#include "cairoint.h" + +#if CAIRO_HAS_PDF_OPERATORS + +#include "cairo-error-private.h" +#include "cairo-pdf-operators-private.h" +#include "cairo-path-fixed-private.h" +#include "cairo-output-stream-private.h" +#include "cairo-scaled-font-subsets-private.h" + +static cairo_status_t +_cairo_pdf_operators_end_text (cairo_pdf_operators_t *pdf_operators); + + +void +_cairo_pdf_operators_init (cairo_pdf_operators_t *pdf_operators, + cairo_output_stream_t *stream, + cairo_matrix_t *cairo_to_pdf, + cairo_scaled_font_subsets_t *font_subsets) +{ + pdf_operators->stream = stream; + pdf_operators->cairo_to_pdf = *cairo_to_pdf; + pdf_operators->font_subsets = font_subsets; + pdf_operators->use_font_subset = NULL; + pdf_operators->use_font_subset_closure = NULL; + pdf_operators->in_text_object = FALSE; + pdf_operators->num_glyphs = 0; + pdf_operators->has_line_style = FALSE; + pdf_operators->use_actual_text = FALSE; +} + +cairo_status_t +_cairo_pdf_operators_fini (cairo_pdf_operators_t *pdf_operators) +{ + return _cairo_pdf_operators_flush (pdf_operators); +} + +void +_cairo_pdf_operators_set_font_subsets_callback (cairo_pdf_operators_t *pdf_operators, + cairo_pdf_operators_use_font_subset_t use_font_subset, + void *closure) +{ + pdf_operators->use_font_subset = use_font_subset; + pdf_operators->use_font_subset_closure = closure; +} + +/* Change the output stream to a different stream. + * _cairo_pdf_operators_flush() should always be called before calling + * this function. + */ +void +_cairo_pdf_operators_set_stream (cairo_pdf_operators_t *pdf_operators, + cairo_output_stream_t *stream) +{ + pdf_operators->stream = stream; + pdf_operators->has_line_style = FALSE; +} + +void +_cairo_pdf_operators_set_cairo_to_pdf_matrix (cairo_pdf_operators_t *pdf_operators, + cairo_matrix_t *cairo_to_pdf) +{ + pdf_operators->cairo_to_pdf = *cairo_to_pdf; + pdf_operators->has_line_style = FALSE; +} + +cairo_private void +_cairo_pdf_operators_enable_actual_text (cairo_pdf_operators_t *pdf_operators, + cairo_bool_t enable) +{ + pdf_operators->use_actual_text = enable; +} + +/* Finish writing out any pending commands to the stream. This + * function must be called by the surface before emitting anything + * into the PDF stream. + * + * pdf_operators may leave the emitted PDF for some operations + * unfinished in case subsequent operations can be merged. This + * function will finish off any incomplete operation so the stream + * will be in a state where the surface may emit its own PDF + * operations (eg changing patterns). + * + */ +cairo_status_t +_cairo_pdf_operators_flush (cairo_pdf_operators_t *pdf_operators) +{ + cairo_status_t status = CAIRO_STATUS_SUCCESS; + + if (pdf_operators->in_text_object) + status = _cairo_pdf_operators_end_text (pdf_operators); + + return status; +} + +/* Reset the known graphics state of the PDF consumer. ie no + * assumptions will be made about the state. The next time a + * particular graphics state is required (eg line width) the state + * operator is always emitted and then remembered for subsequent + * operatations. + * + * This should be called when starting a new stream or after emitting + * the 'Q' operator (where pdf-operators functions were called inside + * the q/Q pair). + */ +void +_cairo_pdf_operators_reset (cairo_pdf_operators_t *pdf_operators) +{ + pdf_operators->has_line_style = FALSE; +} + +/* A word wrap stream can be used as a filter to do word wrapping on + * top of an existing output stream. The word wrapping is quite + * simple, using isspace to determine characters that separate + * words. Any word that will cause the column count exceed the given + * max_column will have a '\n' character emitted before it. + * + * The stream is careful to maintain integrity for words that cross + * the boundary from one call to write to the next. + * + * Note: This stream does not guarantee that the output will never + * exceed max_column. In particular, if a single word is larger than + * max_column it will not be broken up. + */ +typedef struct _word_wrap_stream { + cairo_output_stream_t base; + cairo_output_stream_t *output; + int max_column; + int column; + cairo_bool_t last_write_was_space; + cairo_bool_t in_hexstring; + cairo_bool_t empty_hexstring; +} word_wrap_stream_t; + +static int +_count_word_up_to (const unsigned char *s, int length) +{ + int word = 0; + + while (length--) { + if (! (_cairo_isspace (*s) || *s == '<')) { + s++; + word++; + } else { + return word; + } + } + + return word; +} + + +/* Count up to either the end of the ASCII hexstring or the number + * of columns remaining. + */ +static int +_count_hexstring_up_to (const unsigned char *s, int length, int columns) +{ + int word = 0; + + while (length--) { + if (*s++ != '>') + word++; + else + return word; + + columns--; + if (columns < 0 && word > 1) + return word; + } + + return word; +} + +static cairo_status_t +_word_wrap_stream_write (cairo_output_stream_t *base, + const unsigned char *data, + unsigned int length) +{ + word_wrap_stream_t *stream = (word_wrap_stream_t *) base; + cairo_bool_t newline; + int word; + + while (length) { + if (*data == '<') { + stream->in_hexstring = TRUE; + stream->empty_hexstring = TRUE; + stream->last_write_was_space = FALSE; + data++; + length--; + _cairo_output_stream_printf (stream->output, "<"); + stream->column++; + } else if (*data == '>') { + stream->in_hexstring = FALSE; + stream->last_write_was_space = FALSE; + data++; + length--; + _cairo_output_stream_printf (stream->output, ">"); + stream->column++; + } else if (_cairo_isspace (*data)) { + newline = (*data == '\n' || *data == '\r'); + if (! newline && stream->column >= stream->max_column) { + _cairo_output_stream_printf (stream->output, "\n"); + stream->column = 0; + } + _cairo_output_stream_write (stream->output, data, 1); + data++; + length--; + if (newline) { + stream->column = 0; + } + else + stream->column++; + stream->last_write_was_space = TRUE; + } else { + if (stream->in_hexstring) { + word = _count_hexstring_up_to (data, length, + MAX (stream->max_column - stream->column, 0)); + } else { + word = _count_word_up_to (data, length); + } + /* Don't wrap if this word is a continuation of a non hex + * string word from a previous call to write. */ + if (stream->column + word >= stream->max_column) { + if (stream->last_write_was_space || + (stream->in_hexstring && !stream->empty_hexstring)) + { + _cairo_output_stream_printf (stream->output, "\n"); + stream->column = 0; + } + } + _cairo_output_stream_write (stream->output, data, word); + data += word; + length -= word; + stream->column += word; + stream->last_write_was_space = FALSE; + if (stream->in_hexstring) + stream->empty_hexstring = FALSE; + } + } + + return _cairo_output_stream_get_status (stream->output); +} + +static cairo_status_t +_word_wrap_stream_close (cairo_output_stream_t *base) +{ + word_wrap_stream_t *stream = (word_wrap_stream_t *) base; + + return _cairo_output_stream_get_status (stream->output); +} + +static cairo_output_stream_t * +_word_wrap_stream_create (cairo_output_stream_t *output, int max_column) +{ + word_wrap_stream_t *stream; + + if (output->status) + return _cairo_output_stream_create_in_error (output->status); + + stream = malloc (sizeof (word_wrap_stream_t)); + if (unlikely (stream == NULL)) { + _cairo_error_throw (CAIRO_STATUS_NO_MEMORY); + return (cairo_output_stream_t *) &_cairo_output_stream_nil; + } + + _cairo_output_stream_init (&stream->base, + _word_wrap_stream_write, + NULL, + _word_wrap_stream_close); + stream->output = output; + stream->max_column = max_column; + stream->column = 0; + stream->last_write_was_space = FALSE; + stream->in_hexstring = FALSE; + stream->empty_hexstring = TRUE; + + return &stream->base; +} + +typedef struct _pdf_path_info { + cairo_output_stream_t *output; + cairo_matrix_t *path_transform; + cairo_line_cap_t line_cap; + cairo_point_t last_move_to_point; + cairo_bool_t has_sub_path; +} pdf_path_info_t; + +static cairo_status_t +_cairo_pdf_path_move_to (void *closure, + const cairo_point_t *point) +{ + pdf_path_info_t *info = closure; + double x = _cairo_fixed_to_double (point->x); + double y = _cairo_fixed_to_double (point->y); + + info->last_move_to_point = *point; + info->has_sub_path = FALSE; + cairo_matrix_transform_point (info->path_transform, &x, &y); + _cairo_output_stream_printf (info->output, + "%g %g m ", x, y); + + return _cairo_output_stream_get_status (info->output); +} + +static cairo_status_t +_cairo_pdf_path_line_to (void *closure, + const cairo_point_t *point) +{ + pdf_path_info_t *info = closure; + double x = _cairo_fixed_to_double (point->x); + double y = _cairo_fixed_to_double (point->y); + + if (info->line_cap != CAIRO_LINE_CAP_ROUND && + ! info->has_sub_path && + point->x == info->last_move_to_point.x && + point->y == info->last_move_to_point.y) + { + return CAIRO_STATUS_SUCCESS; + } + + info->has_sub_path = TRUE; + cairo_matrix_transform_point (info->path_transform, &x, &y); + _cairo_output_stream_printf (info->output, + "%g %g l ", x, y); + + return _cairo_output_stream_get_status (info->output); +} + +static cairo_status_t +_cairo_pdf_path_curve_to (void *closure, + const cairo_point_t *b, + const cairo_point_t *c, + const cairo_point_t *d) +{ + pdf_path_info_t *info = closure; + double bx = _cairo_fixed_to_double (b->x); + double by = _cairo_fixed_to_double (b->y); + double cx = _cairo_fixed_to_double (c->x); + double cy = _cairo_fixed_to_double (c->y); + double dx = _cairo_fixed_to_double (d->x); + double dy = _cairo_fixed_to_double (d->y); + + info->has_sub_path = TRUE; + cairo_matrix_transform_point (info->path_transform, &bx, &by); + cairo_matrix_transform_point (info->path_transform, &cx, &cy); + cairo_matrix_transform_point (info->path_transform, &dx, &dy); + _cairo_output_stream_printf (info->output, + "%g %g %g %g %g %g c ", + bx, by, cx, cy, dx, dy); + return _cairo_output_stream_get_status (info->output); +} + +static cairo_status_t +_cairo_pdf_path_close_path (void *closure) +{ + pdf_path_info_t *info = closure; + + if (info->line_cap != CAIRO_LINE_CAP_ROUND && + ! info->has_sub_path) + { + return CAIRO_STATUS_SUCCESS; + } + + _cairo_output_stream_printf (info->output, + "h\n"); + + return _cairo_output_stream_get_status (info->output); +} + +static cairo_status_t +_cairo_pdf_path_rectangle (pdf_path_info_t *info, cairo_box_t *box) +{ + double x1 = _cairo_fixed_to_double (box->p1.x); + double y1 = _cairo_fixed_to_double (box->p1.y); + double x2 = _cairo_fixed_to_double (box->p2.x); + double y2 = _cairo_fixed_to_double (box->p2.y); + + cairo_matrix_transform_point (info->path_transform, &x1, &y1); + cairo_matrix_transform_point (info->path_transform, &x2, &y2); + _cairo_output_stream_printf (info->output, + "%g %g %g %g re ", + x1, y1, x2 - x1, y2 - y1); + + return _cairo_output_stream_get_status (info->output); +} + +/* The line cap value is needed to workaround the fact that PostScript + * and PDF semantics for stroking degenerate sub-paths do not match + * cairo semantics. (PostScript draws something for any line cap + * value, while cairo draws something only for round caps). + * + * When using this function to emit a path to be filled, rather than + * stroked, simply pass %CAIRO_LINE_CAP_ROUND which will guarantee that + * the stroke workaround will not modify the path being emitted. + */ +static cairo_status_t +_cairo_pdf_operators_emit_path (cairo_pdf_operators_t *pdf_operators, + cairo_path_fixed_t *path, + cairo_matrix_t *path_transform, + cairo_line_cap_t line_cap) +{ + cairo_output_stream_t *word_wrap; + cairo_status_t status, status2; + pdf_path_info_t info; + cairo_box_t box; + + word_wrap = _word_wrap_stream_create (pdf_operators->stream, 72); + status = _cairo_output_stream_get_status (word_wrap); + if (unlikely (status)) + return _cairo_output_stream_destroy (word_wrap); + + info.output = word_wrap; + info.path_transform = path_transform; + info.line_cap = line_cap; + if (_cairo_path_fixed_is_rectangle (path, &box)) { + status = _cairo_pdf_path_rectangle (&info, &box); + } else { + status = _cairo_path_fixed_interpret (path, + CAIRO_DIRECTION_FORWARD, + _cairo_pdf_path_move_to, + _cairo_pdf_path_line_to, + _cairo_pdf_path_curve_to, + _cairo_pdf_path_close_path, + &info); + } + + status2 = _cairo_output_stream_destroy (word_wrap); + if (status == CAIRO_STATUS_SUCCESS) + status = status2; + + return status; +} + +cairo_int_status_t +_cairo_pdf_operators_clip (cairo_pdf_operators_t *pdf_operators, + cairo_path_fixed_t *path, + cairo_fill_rule_t fill_rule) +{ + const char *pdf_operator; + cairo_status_t status; + + if (pdf_operators->in_text_object) { + status = _cairo_pdf_operators_end_text (pdf_operators); + if (unlikely (status)) + return status; + } + + if (! path->has_current_point) { + /* construct an empty path */ + _cairo_output_stream_printf (pdf_operators->stream, "0 0 m "); + } else { + status = _cairo_pdf_operators_emit_path (pdf_operators, + path, + &pdf_operators->cairo_to_pdf, + CAIRO_LINE_CAP_ROUND); + if (unlikely (status)) + return status; + } + + switch (fill_rule) { + default: + ASSERT_NOT_REACHED; + case CAIRO_FILL_RULE_WINDING: + pdf_operator = "W"; + break; + case CAIRO_FILL_RULE_EVEN_ODD: + pdf_operator = "W*"; + break; + } + + _cairo_output_stream_printf (pdf_operators->stream, + "%s n\n", + pdf_operator); + + return _cairo_output_stream_get_status (pdf_operators->stream); +} + +static int +_cairo_pdf_line_cap (cairo_line_cap_t cap) +{ + switch (cap) { + case CAIRO_LINE_CAP_BUTT: + return 0; + case CAIRO_LINE_CAP_ROUND: + return 1; + case CAIRO_LINE_CAP_SQUARE: + return 2; + default: + ASSERT_NOT_REACHED; + return 0; + } +} + +static int +_cairo_pdf_line_join (cairo_line_join_t join) +{ + switch (join) { + case CAIRO_LINE_JOIN_MITER: + return 0; + case CAIRO_LINE_JOIN_ROUND: + return 1; + case CAIRO_LINE_JOIN_BEVEL: + return 2; + default: + ASSERT_NOT_REACHED; + return 0; + } +} + +cairo_int_status_t +_cairo_pdf_operators_emit_stroke_style (cairo_pdf_operators_t *pdf_operators, + const cairo_stroke_style_t *style, + double scale) +{ + double *dash = style->dash; + int num_dashes = style->num_dashes; + double dash_offset = style->dash_offset; + double line_width = style->line_width * scale; + + /* PostScript has "special needs" when it comes to zero-length + * dash segments with butt caps. It apparently (at least + * according to ghostscript) draws hairlines for this + * case. That's not what the cairo semantics want, so we first + * touch up the array to eliminate any 0.0 values that will + * result in "on" segments. + */ + if (num_dashes && style->line_cap == CAIRO_LINE_CAP_BUTT) { + int i; + + /* If there's an odd number of dash values they will each get + * interpreted as both on and off. So we first explicitly + * expand the array to remove the duplicate usage so that we + * can modify some of the values. + */ + if (num_dashes % 2) { + dash = _cairo_malloc_abc (num_dashes, 2, sizeof (double)); + if (unlikely (dash == NULL)) + return _cairo_error (CAIRO_STATUS_NO_MEMORY); + + memcpy (dash, style->dash, num_dashes * sizeof (double)); + memcpy (dash + num_dashes, style->dash, num_dashes * sizeof (double)); + + num_dashes *= 2; + } + + for (i = 0; i < num_dashes; i += 2) { + if (dash[i] == 0.0) { + /* Do not modify the dashes in-place, as we may need to also + * replay this stroke to an image fallback. + */ + if (dash == style->dash) { + dash = _cairo_malloc_ab (num_dashes, sizeof (double)); + if (unlikely (dash == NULL)) + return _cairo_error (CAIRO_STATUS_NO_MEMORY); + memcpy (dash, style->dash, num_dashes * sizeof (double)); + } + + /* If we're at the front of the list, we first rotate + * two elements from the end of the list to the front + * of the list before folding away the 0.0. Or, if + * there are only two dash elements, then there is + * nothing at all to draw. + */ + if (i == 0) { + double last_two[2]; + + if (num_dashes == 2) { + free (dash); + return CAIRO_INT_STATUS_NOTHING_TO_DO; + } + + /* The cases of num_dashes == 0, 1, or 3 elements + * cannot exist, so the rotation of 2 elements + * will always be safe */ + memcpy (last_two, dash + num_dashes - 2, sizeof (last_two)); + memmove (dash + 2, dash, (num_dashes - 2) * sizeof (double)); + memcpy (dash, last_two, sizeof (last_two)); + dash_offset += dash[0] + dash[1]; + i = 2; + } + dash[i-1] += dash[i+1]; + num_dashes -= 2; + memmove (dash + i, dash + i + 2, (num_dashes - i) * sizeof (double)); + /* If we might have just rotated, it's possible that + * we rotated a 0.0 value to the front of the list. + * Set i to -2 so it will get incremented to 0. */ + if (i == 2) + i = -2; + } + } + } + + if (!pdf_operators->has_line_style || pdf_operators->line_width != line_width) { + _cairo_output_stream_printf (pdf_operators->stream, + "%f w\n", + line_width); + pdf_operators->line_width = line_width; + } + + if (!pdf_operators->has_line_style || pdf_operators->line_cap != style->line_cap) { + _cairo_output_stream_printf (pdf_operators->stream, + "%d J\n", + _cairo_pdf_line_cap (style->line_cap)); + pdf_operators->line_cap = style->line_cap; + } + + if (!pdf_operators->has_line_style || pdf_operators->line_join != style->line_join) { + _cairo_output_stream_printf (pdf_operators->stream, + "%d j\n", + _cairo_pdf_line_join (style->line_join)); + pdf_operators->line_join = style->line_join; + } + + if (num_dashes) { + int d; + + _cairo_output_stream_printf (pdf_operators->stream, "["); + for (d = 0; d < num_dashes; d++) + _cairo_output_stream_printf (pdf_operators->stream, " %f", dash[d] * scale); + _cairo_output_stream_printf (pdf_operators->stream, "] %f d\n", + dash_offset * scale); + pdf_operators->has_dashes = TRUE; + } else if (!pdf_operators->has_line_style || pdf_operators->has_dashes) { + _cairo_output_stream_printf (pdf_operators->stream, "[] 0.0 d\n"); + pdf_operators->has_dashes = FALSE; + } + if (dash != style->dash) + free (dash); + + if (!pdf_operators->has_line_style || pdf_operators->miter_limit != style->miter_limit) { + _cairo_output_stream_printf (pdf_operators->stream, + "%f M ", + style->miter_limit < 1.0 ? 1.0 : style->miter_limit); + pdf_operators->miter_limit = style->miter_limit; + } + pdf_operators->has_line_style = TRUE; + + return _cairo_output_stream_get_status (pdf_operators->stream); +} + +/* Scale the matrix so the largest absolute value of the non + * translation components is 1.0. Return the scale required to restore + * the matrix to the original values. + * + * eg the matrix [ 100 0 0 50 20 10 ] + * + * is rescaled to [ 1 0 0 0.5 0.2 0.1 ] + * and the scale returned is 100 + */ +static void +_cairo_matrix_factor_out_scale (cairo_matrix_t *m, double *scale) +{ + double s; + + s = fabs (m->xx); + if (fabs (m->xy) > s) + s = fabs (m->xy); + if (fabs (m->yx) > s) + s = fabs (m->yx); + if (fabs (m->yy) > s) + s = fabs (m->yy); + *scale = s; + s = 1.0/s; + cairo_matrix_scale (m, s, s); +} + +static cairo_int_status_t +_cairo_pdf_operators_emit_stroke (cairo_pdf_operators_t *pdf_operators, + cairo_path_fixed_t *path, + const cairo_stroke_style_t *style, + const cairo_matrix_t *ctm, + const cairo_matrix_t *ctm_inverse, + const char *pdf_operator) +{ + cairo_status_t status; + cairo_matrix_t m, path_transform; + cairo_bool_t has_ctm = TRUE; + double scale = 1.0; + + if (pdf_operators->in_text_object) { + status = _cairo_pdf_operators_end_text (pdf_operators); + if (unlikely (status)) + return status; + } + + /* Optimize away the stroke ctm when it does not affect the + * stroke. There are other ctm cases that could be optimized + * however this is the most common. + */ + if (fabs(ctm->xx) == 1.0 && fabs(ctm->yy) == 1.0 && + fabs(ctm->xy) == 0.0 && fabs(ctm->yx) == 0.0) + { + has_ctm = FALSE; + } + + /* The PDF CTM is transformed to the user space CTM when stroking + * so the corect pen shape will be used. This also requires that + * the path be transformed to user space when emitted. The + * conversion of path coordinates to user space may cause rounding + * errors. For example the device space point (1.234, 3.142) when + * transformed to a user space CTM of [100 0 0 100 0 0] will be + * emitted as (0.012, 0.031). + * + * To avoid the rounding problem we scale the user space CTM + * matrix so that all the non translation components of the matrix + * are <= 1. The line width and and dashes are scaled by the + * inverse of the scale applied to the CTM. This maintains the + * shape of the stroke pen while keeping the user space CTM within + * the range that maximizes the precision of the emitted path. + */ + if (has_ctm) { + m = *ctm; + /* Zero out the translation since it does not affect the pen + * shape however it may cause unnecessary digits to be emitted. + */ + m.x0 = 0.0; + m.y0 = 0.0; + _cairo_matrix_factor_out_scale (&m, &scale); + path_transform = m; + status = cairo_matrix_invert (&path_transform); + if (unlikely (status)) + return status; + + cairo_matrix_multiply (&m, &m, &pdf_operators->cairo_to_pdf); + } + + status = _cairo_pdf_operators_emit_stroke_style (pdf_operators, style, scale); + if (status == CAIRO_INT_STATUS_NOTHING_TO_DO) + return CAIRO_STATUS_SUCCESS; + if (unlikely (status)) + return status; + + if (has_ctm) { + _cairo_output_stream_printf (pdf_operators->stream, + "q %f %f %f %f %f %f cm\n", + m.xx, m.yx, m.xy, m.yy, + m.x0, m.y0); + } else { + path_transform = pdf_operators->cairo_to_pdf; + } + + status = _cairo_pdf_operators_emit_path (pdf_operators, + path, + &path_transform, + style->line_cap); + if (unlikely (status)) + return status; + + _cairo_output_stream_printf (pdf_operators->stream, "%s", pdf_operator); + if (has_ctm) + _cairo_output_stream_printf (pdf_operators->stream, " Q"); + + _cairo_output_stream_printf (pdf_operators->stream, "\n"); + + return _cairo_output_stream_get_status (pdf_operators->stream); +} + +cairo_int_status_t +_cairo_pdf_operators_stroke (cairo_pdf_operators_t *pdf_operators, + cairo_path_fixed_t *path, + const cairo_stroke_style_t *style, + const cairo_matrix_t *ctm, + const cairo_matrix_t *ctm_inverse) +{ + return _cairo_pdf_operators_emit_stroke (pdf_operators, + path, + style, + ctm, + ctm_inverse, + "S"); +} + +cairo_int_status_t +_cairo_pdf_operators_fill (cairo_pdf_operators_t *pdf_operators, + cairo_path_fixed_t *path, + cairo_fill_rule_t fill_rule) +{ + const char *pdf_operator; + cairo_status_t status; + + if (pdf_operators->in_text_object) { + status = _cairo_pdf_operators_end_text (pdf_operators); + if (unlikely (status)) + return status; + } + + status = _cairo_pdf_operators_emit_path (pdf_operators, + path, + &pdf_operators->cairo_to_pdf, + CAIRO_LINE_CAP_ROUND); + if (unlikely (status)) + return status; + + switch (fill_rule) { + default: + ASSERT_NOT_REACHED; + case CAIRO_FILL_RULE_WINDING: + pdf_operator = "f"; + break; + case CAIRO_FILL_RULE_EVEN_ODD: + pdf_operator = "f*"; + break; + } + + _cairo_output_stream_printf (pdf_operators->stream, + "%s\n", + pdf_operator); + + return _cairo_output_stream_get_status (pdf_operators->stream); +} + +cairo_int_status_t +_cairo_pdf_operators_fill_stroke (cairo_pdf_operators_t *pdf_operators, + cairo_path_fixed_t *path, + cairo_fill_rule_t fill_rule, + const cairo_stroke_style_t *style, + const cairo_matrix_t *ctm, + const cairo_matrix_t *ctm_inverse) +{ + const char *operator; + + switch (fill_rule) { + default: + ASSERT_NOT_REACHED; + case CAIRO_FILL_RULE_WINDING: + operator = "B"; + break; + case CAIRO_FILL_RULE_EVEN_ODD: + operator = "B*"; + break; + } + + return _cairo_pdf_operators_emit_stroke (pdf_operators, + path, + style, + ctm, + ctm_inverse, + operator); +} + +#define GLYPH_POSITION_TOLERANCE 0.001 + +/* Emit the string of glyphs using the 'Tj' operator. This requires + * that the glyphs are positioned at their natural glyph advances. */ +static cairo_status_t +_cairo_pdf_operators_emit_glyph_string (cairo_pdf_operators_t *pdf_operators, + cairo_output_stream_t *stream) +{ + int i; + + _cairo_output_stream_printf (stream, "<"); + for (i = 0; i < pdf_operators->num_glyphs; i++) { + _cairo_output_stream_printf (stream, + "%0*x", + pdf_operators->hex_width, + pdf_operators->glyphs[i].glyph_index); + pdf_operators->cur_x += pdf_operators->glyphs[i].x_advance; + } + _cairo_output_stream_printf (stream, ">Tj\n"); + + return _cairo_output_stream_get_status (stream); +} + +/* Emit the string of glyphs using the 'TJ' operator. + * + * The TJ operator takes an array of strings of glyphs. Each string of + * glyphs is displayed using the glyph advances of each glyph to + * position the glyphs. A relative adjustment to the glyph advance may + * be specified by including the adjustment between two strings. The + * adjustment is in units of text space * -1000. + */ +static cairo_status_t +_cairo_pdf_operators_emit_glyph_string_with_positioning ( + cairo_pdf_operators_t *pdf_operators, + cairo_output_stream_t *stream) +{ + int i; + + _cairo_output_stream_printf (stream, "[<"); + for (i = 0; i < pdf_operators->num_glyphs; i++) { + if (pdf_operators->glyphs[i].x_position != pdf_operators->cur_x) + { + double delta = pdf_operators->glyphs[i].x_position - pdf_operators->cur_x; + int rounded_delta; + + delta = -1000.0*delta; + /* As the delta is in 1/1000 of a unit of text space, + * rounding to an integer should still provide sufficient + * precision. We round the delta before adding to Tm_x so + * that we keep track of the accumulated rounding error in + * the PDF interpreter and compensate for it when + * calculating subsequent deltas. + */ + rounded_delta = _cairo_lround (delta); + if (rounded_delta != 0) { + _cairo_output_stream_printf (stream, + ">%d<", + rounded_delta); + } + + /* Convert the rounded delta back to text + * space before adding to the current text + * position. */ + delta = rounded_delta/-1000.0; + pdf_operators->cur_x += delta; + } + + _cairo_output_stream_printf (stream, + "%0*x", + pdf_operators->hex_width, + pdf_operators->glyphs[i].glyph_index); + pdf_operators->cur_x += pdf_operators->glyphs[i].x_advance; + } + _cairo_output_stream_printf (stream, ">]TJ\n"); + + return _cairo_output_stream_get_status (stream); +} + +static cairo_status_t +_cairo_pdf_operators_flush_glyphs (cairo_pdf_operators_t *pdf_operators) +{ + cairo_output_stream_t *word_wrap_stream; + cairo_status_t status, status2; + int i; + double x; + + if (pdf_operators->num_glyphs == 0) + return CAIRO_STATUS_SUCCESS; + + word_wrap_stream = _word_wrap_stream_create (pdf_operators->stream, 72); + status = _cairo_output_stream_get_status (word_wrap_stream); + if (unlikely (status)) + return _cairo_output_stream_destroy (word_wrap_stream); + + /* Check if glyph advance used to position every glyph */ + x = pdf_operators->cur_x; + for (i = 0; i < pdf_operators->num_glyphs; i++) { + if (fabs(pdf_operators->glyphs[i].x_position - x) > GLYPH_POSITION_TOLERANCE) + break; + x += pdf_operators->glyphs[i].x_advance; + } + if (i == pdf_operators->num_glyphs) { + status = _cairo_pdf_operators_emit_glyph_string (pdf_operators, + word_wrap_stream); + } else { + status = _cairo_pdf_operators_emit_glyph_string_with_positioning ( + pdf_operators, word_wrap_stream); + } + + pdf_operators->num_glyphs = 0; + pdf_operators->glyph_buf_x_pos = pdf_operators->cur_x; + status2 = _cairo_output_stream_destroy (word_wrap_stream); + if (status == CAIRO_STATUS_SUCCESS) + status = status2; + + return status; +} + +static cairo_status_t +_cairo_pdf_operators_add_glyph (cairo_pdf_operators_t *pdf_operators, + cairo_scaled_font_subsets_glyph_t *glyph, + double x_position) +{ + double x, y; + + x = glyph->x_advance; + y = glyph->y_advance; + if (glyph->is_scaled) + cairo_matrix_transform_distance (&pdf_operators->font_matrix_inverse, &x, &y); + + pdf_operators->glyphs[pdf_operators->num_glyphs].x_position = x_position; + pdf_operators->glyphs[pdf_operators->num_glyphs].glyph_index = glyph->subset_glyph_index; + pdf_operators->glyphs[pdf_operators->num_glyphs].x_advance = x; + pdf_operators->glyph_buf_x_pos += x; + pdf_operators->num_glyphs++; + if (pdf_operators->num_glyphs == PDF_GLYPH_BUFFER_SIZE) + return _cairo_pdf_operators_flush_glyphs (pdf_operators); + + return CAIRO_STATUS_SUCCESS; +} + +/* Use 'Tm' operator to set the PDF text matrix. */ +static cairo_status_t +_cairo_pdf_operators_set_text_matrix (cairo_pdf_operators_t *pdf_operators, + cairo_matrix_t *matrix) +{ + cairo_matrix_t inverse; + cairo_status_t status; + + /* We require the matrix to be invertable. */ + inverse = *matrix; + status = cairo_matrix_invert (&inverse); + if (unlikely (status)) + return status; + + pdf_operators->text_matrix = *matrix; + pdf_operators->cur_x = 0; + pdf_operators->cur_y = 0; + pdf_operators->glyph_buf_x_pos = 0; + _cairo_output_stream_printf (pdf_operators->stream, + "%f %f %f %f %f %f Tm\n", + pdf_operators->text_matrix.xx, + pdf_operators->text_matrix.yx, + pdf_operators->text_matrix.xy, + pdf_operators->text_matrix.yy, + pdf_operators->text_matrix.x0, + pdf_operators->text_matrix.y0); + + pdf_operators->cairo_to_pdftext = *matrix; + status = cairo_matrix_invert (&pdf_operators->cairo_to_pdftext); + assert (status == CAIRO_STATUS_SUCCESS); + cairo_matrix_multiply (&pdf_operators->cairo_to_pdftext, + &pdf_operators->cairo_to_pdf, + &pdf_operators->cairo_to_pdftext); + + return _cairo_output_stream_get_status (pdf_operators->stream); +} + +#define TEXT_MATRIX_TOLERANCE 1e-6 + +/* Set the translation components of the PDF text matrix to x, y. The + * 'Td' operator is used to transform the text matrix. + */ +static cairo_status_t +_cairo_pdf_operators_set_text_position (cairo_pdf_operators_t *pdf_operators, + double x, + double y) +{ + cairo_matrix_t translate, inverse; + cairo_status_t status; + + /* The Td operator transforms the text_matrix with: + * + * text_matrix' = T x text_matrix + * + * where T is a translation matrix with the translation components + * set to the Td operands tx and ty. + */ + inverse = pdf_operators->text_matrix; + status = cairo_matrix_invert (&inverse); + assert (status == CAIRO_STATUS_SUCCESS); + pdf_operators->text_matrix.x0 = x; + pdf_operators->text_matrix.y0 = y; + cairo_matrix_multiply (&translate, &pdf_operators->text_matrix, &inverse); + if (fabs(translate.x0) < TEXT_MATRIX_TOLERANCE) + translate.x0 = 0.0; + if (fabs(translate.y0) < TEXT_MATRIX_TOLERANCE) + translate.y0 = 0.0; + _cairo_output_stream_printf (pdf_operators->stream, + "%f %f Td\n", + translate.x0, + translate.y0); + pdf_operators->cur_x = 0; + pdf_operators->cur_y = 0; + pdf_operators->glyph_buf_x_pos = 0; + + pdf_operators->cairo_to_pdftext = pdf_operators->text_matrix; + status = cairo_matrix_invert (&pdf_operators->cairo_to_pdftext); + assert (status == CAIRO_STATUS_SUCCESS); + cairo_matrix_multiply (&pdf_operators->cairo_to_pdftext, + &pdf_operators->cairo_to_pdf, + &pdf_operators->cairo_to_pdftext); + + return _cairo_output_stream_get_status (pdf_operators->stream); +} + +/* Select the font using the 'Tf' operator. The font size is set to 1 + * as we use the 'Tm' operator to set the font scale. + */ +static cairo_status_t +_cairo_pdf_operators_set_font_subset (cairo_pdf_operators_t *pdf_operators, + cairo_scaled_font_subsets_glyph_t *subset_glyph) +{ + cairo_status_t status; + + _cairo_output_stream_printf (pdf_operators->stream, + "/f-%d-%d 1 Tf\n", + subset_glyph->font_id, + subset_glyph->subset_id); + if (pdf_operators->use_font_subset) { + status = pdf_operators->use_font_subset (subset_glyph->font_id, + subset_glyph->subset_id, + pdf_operators->use_font_subset_closure); + if (unlikely (status)) + return status; + } + pdf_operators->font_id = subset_glyph->font_id; + pdf_operators->subset_id = subset_glyph->subset_id; + + if (subset_glyph->is_composite) + pdf_operators->hex_width = 4; + else + pdf_operators->hex_width = 2; + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_status_t +_cairo_pdf_operators_begin_text (cairo_pdf_operators_t *pdf_operators) +{ + _cairo_output_stream_printf (pdf_operators->stream, "BT\n"); + + pdf_operators->in_text_object = TRUE; + pdf_operators->num_glyphs = 0; + pdf_operators->glyph_buf_x_pos = 0; + + return _cairo_output_stream_get_status (pdf_operators->stream); +} + +static cairo_status_t +_cairo_pdf_operators_end_text (cairo_pdf_operators_t *pdf_operators) +{ + cairo_status_t status; + + status = _cairo_pdf_operators_flush_glyphs (pdf_operators); + if (unlikely (status)) + return status; + + _cairo_output_stream_printf (pdf_operators->stream, "ET\n"); + + pdf_operators->in_text_object = FALSE; + + return _cairo_output_stream_get_status (pdf_operators->stream); +} + +/* Compare the scale components of two matrices. The translation + * components are ignored. */ +static cairo_bool_t +_cairo_matrix_scale_equal (cairo_matrix_t *a, cairo_matrix_t *b) +{ + return (a->xx == b->xx && + a->xy == b->xy && + a->yx == b->yx && + a->yy == b->yy); +} + +static cairo_status_t +_cairo_pdf_operators_begin_actualtext (cairo_pdf_operators_t *pdf_operators, + const char *utf8, + int utf8_len) +{ + uint16_t *utf16; + int utf16_len; + cairo_status_t status; + int i; + + _cairo_output_stream_printf (pdf_operators->stream, "/Span << /ActualText stream, + "%04x", (int) (utf16[i])); + } + free (utf16); + } + _cairo_output_stream_printf (pdf_operators->stream, "> >> BDC\n"); + + return _cairo_output_stream_get_status (pdf_operators->stream); +} + +static cairo_status_t +_cairo_pdf_operators_end_actualtext (cairo_pdf_operators_t *pdf_operators) +{ + _cairo_output_stream_printf (pdf_operators->stream, "EMC\n"); + + return _cairo_output_stream_get_status (pdf_operators->stream); +} + +static cairo_status_t +_cairo_pdf_operators_emit_glyph (cairo_pdf_operators_t *pdf_operators, + cairo_glyph_t *glyph, + cairo_scaled_font_subsets_glyph_t *subset_glyph) +{ + double x, y; + cairo_status_t status; + + if (pdf_operators->is_new_text_object || + pdf_operators->font_id != subset_glyph->font_id || + pdf_operators->subset_id != subset_glyph->subset_id) + { + status = _cairo_pdf_operators_flush_glyphs (pdf_operators); + if (unlikely (status)) + return status; + + status = _cairo_pdf_operators_set_font_subset (pdf_operators, subset_glyph); + if (unlikely (status)) + return status; + + pdf_operators->is_new_text_object = FALSE; + } + + x = glyph->x; + y = glyph->y; + cairo_matrix_transform_point (&pdf_operators->cairo_to_pdftext, &x, &y); + + /* The TJ operator for displaying text strings can only set + * the horizontal position of the glyphs. If the y position + * (in text space) changes, use the Td operator to change the + * current position to the next glyph. We also use the Td + * operator to move the current position if the horizontal + * position changes by more than 10 (in text space + * units). This is becauses the horizontal glyph positioning + * in the TJ operator is intended for kerning and there may be + * PDF consumers that do not handle very large position + * adjustments in TJ. + */ + if (fabs(x - pdf_operators->glyph_buf_x_pos) > 10 || + fabs(y - pdf_operators->cur_y) > GLYPH_POSITION_TOLERANCE) + { + status = _cairo_pdf_operators_flush_glyphs (pdf_operators); + if (unlikely (status)) + return status; + + x = glyph->x; + y = glyph->y; + cairo_matrix_transform_point (&pdf_operators->cairo_to_pdf, &x, &y); + status = _cairo_pdf_operators_set_text_position (pdf_operators, x, y); + if (unlikely (status)) + return status; + + x = 0.0; + y = 0.0; + } + + status = _cairo_pdf_operators_add_glyph (pdf_operators, + subset_glyph, + x); + return status; +} + +/* A utf8_len of -1 indicates no unicode text. A utf8_len = 0 is an + * empty string. + */ +static cairo_int_status_t +_cairo_pdf_operators_emit_cluster (cairo_pdf_operators_t *pdf_operators, + const char *utf8, + int utf8_len, + cairo_glyph_t *glyphs, + int num_glyphs, + cairo_text_cluster_flags_t cluster_flags, + cairo_scaled_font_t *scaled_font) +{ + cairo_scaled_font_subsets_glyph_t subset_glyph; + cairo_glyph_t *cur_glyph; + cairo_status_t status = CAIRO_STATUS_SUCCESS; + int i; + + /* If the cluster maps 1 glyph to 1 or more unicode characters, we + * first try _map_glyph() with the unicode string to see if it can + * use toUnicode to map our glyph to the unicode. This will fail + * if the glyph is already mapped to a different unicode string. + * + * We also go through this path if no unicode mapping was + * supplied (utf8_len < 0). + * + * Mapping a glyph to a zero length unicode string requires the + * use of ActualText. + */ + if (num_glyphs == 1 && utf8_len != 0) { + status = _cairo_scaled_font_subsets_map_glyph (pdf_operators->font_subsets, + scaled_font, + glyphs->index, + utf8, + utf8_len, + &subset_glyph); + if (unlikely (status)) + return status; + + if (subset_glyph.utf8_is_mapped || utf8_len < 0) { + status = _cairo_pdf_operators_emit_glyph (pdf_operators, + glyphs, + &subset_glyph); + if (unlikely (status)) + return status; + + return CAIRO_STATUS_SUCCESS; + } + } + + if (pdf_operators->use_actual_text) { + /* Fallback to using ActualText to map zero or more glyphs to a + * unicode string. */ + status = _cairo_pdf_operators_flush_glyphs (pdf_operators); + if (unlikely (status)) + return status; + + status = _cairo_pdf_operators_begin_actualtext (pdf_operators, utf8, utf8_len); + if (unlikely (status)) + return status; + } + + cur_glyph = glyphs; + /* XXX + * If no glyphs, we should put *something* here for the text to be selectable. */ + for (i = 0; i < num_glyphs; i++) { + status = _cairo_scaled_font_subsets_map_glyph (pdf_operators->font_subsets, + scaled_font, + cur_glyph->index, + NULL, -1, + &subset_glyph); + if (unlikely (status)) + return status; + + status = _cairo_pdf_operators_emit_glyph (pdf_operators, + cur_glyph, + &subset_glyph); + if (unlikely (status)) + return status; + + if ((cluster_flags & CAIRO_TEXT_CLUSTER_FLAG_BACKWARD)) + cur_glyph--; + else + cur_glyph++; + } + + if (pdf_operators->use_actual_text) { + status = _cairo_pdf_operators_flush_glyphs (pdf_operators); + if (unlikely (status)) + return status; + + status = _cairo_pdf_operators_end_actualtext (pdf_operators); + } + + return status; +} + +cairo_int_status_t +_cairo_pdf_operators_show_text_glyphs (cairo_pdf_operators_t *pdf_operators, + const char *utf8, + int utf8_len, + cairo_glyph_t *glyphs, + int num_glyphs, + const cairo_text_cluster_t *clusters, + int num_clusters, + cairo_text_cluster_flags_t cluster_flags, + cairo_scaled_font_t *scaled_font) +{ + cairo_status_t status; + int i; + cairo_matrix_t text_matrix, invert_y_axis; + double x, y; + const char *cur_text; + cairo_glyph_t *cur_glyph; + + pdf_operators->font_matrix_inverse = scaled_font->font_matrix; + status = cairo_matrix_invert (&pdf_operators->font_matrix_inverse); + if (status == CAIRO_STATUS_INVALID_MATRIX) + return CAIRO_STATUS_SUCCESS; + assert (status == CAIRO_STATUS_SUCCESS); + + pdf_operators->is_new_text_object = FALSE; + if (pdf_operators->in_text_object == FALSE) { + status = _cairo_pdf_operators_begin_text (pdf_operators); + if (unlikely (status)) + return status; + + /* Force Tm and Tf to be emitted when starting a new text + * object.*/ + pdf_operators->is_new_text_object = TRUE; + } + + cairo_matrix_init_scale (&invert_y_axis, 1, -1); + text_matrix = scaled_font->scale; + + /* Invert y axis in font space */ + cairo_matrix_multiply (&text_matrix, &text_matrix, &invert_y_axis); + + /* Invert y axis in device space */ + cairo_matrix_multiply (&text_matrix, &invert_y_axis, &text_matrix); + + if (pdf_operators->is_new_text_object || + ! _cairo_matrix_scale_equal (&pdf_operators->text_matrix, &text_matrix)) + { + status = _cairo_pdf_operators_flush_glyphs (pdf_operators); + if (unlikely (status)) + return status; + + x = glyphs[0].x; + y = glyphs[0].y; + cairo_matrix_transform_point (&pdf_operators->cairo_to_pdf, &x, &y); + text_matrix.x0 = x; + text_matrix.y0 = y; + status = _cairo_pdf_operators_set_text_matrix (pdf_operators, &text_matrix); + if (status == CAIRO_STATUS_INVALID_MATRIX) + return CAIRO_STATUS_SUCCESS; + if (unlikely (status)) + return status; + } + + if (num_clusters > 0) { + cur_text = utf8; + if ((cluster_flags & CAIRO_TEXT_CLUSTER_FLAG_BACKWARD)) + cur_glyph = glyphs + num_glyphs; + else + cur_glyph = glyphs; + for (i = 0; i < num_clusters; i++) { + if ((cluster_flags & CAIRO_TEXT_CLUSTER_FLAG_BACKWARD)) + cur_glyph -= clusters[i].num_glyphs; + status = _cairo_pdf_operators_emit_cluster (pdf_operators, + cur_text, + clusters[i].num_bytes, + cur_glyph, + clusters[i].num_glyphs, + cluster_flags, + scaled_font); + if (unlikely (status)) + return status; + + cur_text += clusters[i].num_bytes; + if (!(cluster_flags & CAIRO_TEXT_CLUSTER_FLAG_BACKWARD)) + cur_glyph += clusters[i].num_glyphs; + } + } else { + for (i = 0; i < num_glyphs; i++) { + status = _cairo_pdf_operators_emit_cluster (pdf_operators, + NULL, + -1, /* no unicode string available */ + &glyphs[i], + 1, + FALSE, + scaled_font); + if (unlikely (status)) + return status; + } + } + + return _cairo_output_stream_get_status (pdf_operators->stream); +} + +#endif /* CAIRO_HAS_PDF_OPERATORS */ diff --git a/programs/develop/libraries/cairo/src/cairo-png.c b/programs/develop/libraries/cairo/src/cairo-png.c new file mode 100644 index 0000000000..41a33d7533 --- /dev/null +++ b/programs/develop/libraries/cairo/src/cairo-png.c @@ -0,0 +1,798 @@ +/* cairo - a vector graphics library with display and print output + * + * Copyright © 2003 University of Southern California + * + * This library is free software; you can redistribute it and/or + * modify it either under the terms of the GNU Lesser General Public + * License version 2.1 as published by the Free Software Foundation + * (the "LGPL") or, at your option, under the terms of the Mozilla + * Public License Version 1.1 (the "MPL"). If you do not alter this + * notice, a recipient may use your version of this file under either + * the MPL or the LGPL. + * + * You should have received a copy of the LGPL along with this library + * in the file COPYING-LGPL-2.1; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA + * You should have received a copy of the MPL along with this library + * in the file COPYING-MPL-1.1 + * + * The contents of this file are subject to the Mozilla Public License + * Version 1.1 (the "License"); you may not use this file except in + * compliance with the License. You may obtain a copy of the License at + * http://www.mozilla.org/MPL/ + * + * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY + * OF ANY KIND, either express or implied. See the LGPL or the MPL for + * the specific language governing rights and limitations. + * + * The Original Code is the cairo graphics library. + * + * The Initial Developer of the Original Code is University of Southern + * California. + * + * Contributor(s): + * Carl D. Worth + * Kristian Høgsberg + * Chris Wilson + */ + +#include "cairoint.h" + +#include "cairo-error-private.h" +#include "cairo-output-stream-private.h" + +#include +#include +#include + +/** + * SECTION:cairo-png + * @Title: PNG Support + * @Short_Description: Reading and writing PNG images + * @See_Also: #cairo_surface_t + * + * The PNG functions allow reading PNG images into image surfaces, and writing + * any surface to a PNG file. + */ + +/** + * CAIRO_HAS_PNG_FUNCTIONS: + * + * Defined if the PNG functions are available. + * This macro can be used to conditionally compile code using the cairo + * PNG functions. + */ + +struct png_read_closure_t { + cairo_read_func_t read_func; + void *closure; + cairo_output_stream_t *png_data; +}; + + +/* Unpremultiplies data and converts native endian ARGB => RGBA bytes */ +static void +unpremultiply_data (png_structp png, png_row_infop row_info, png_bytep data) +{ + unsigned int i; + + for (i = 0; i < row_info->rowbytes; i += 4) { + uint8_t *b = &data[i]; + uint32_t pixel; + uint8_t alpha; + + memcpy (&pixel, b, sizeof (uint32_t)); + alpha = (pixel & 0xff000000) >> 24; + if (alpha == 0) { + b[0] = b[1] = b[2] = b[3] = 0; + } else { + b[0] = (((pixel & 0xff0000) >> 16) * 255 + alpha / 2) / alpha; + b[1] = (((pixel & 0x00ff00) >> 8) * 255 + alpha / 2) / alpha; + b[2] = (((pixel & 0x0000ff) >> 0) * 255 + alpha / 2) / alpha; + b[3] = alpha; + } + } +} + +/* Converts native endian xRGB => RGBx bytes */ +static void +convert_data_to_bytes (png_structp png, png_row_infop row_info, png_bytep data) +{ + unsigned int i; + + for (i = 0; i < row_info->rowbytes; i += 4) { + uint8_t *b = &data[i]; + uint32_t pixel; + + memcpy (&pixel, b, sizeof (uint32_t)); + + b[0] = (pixel & 0xff0000) >> 16; + b[1] = (pixel & 0x00ff00) >> 8; + b[2] = (pixel & 0x0000ff) >> 0; + b[3] = 0; + } +} + +/* Use a couple of simple error callbacks that do not print anything to + * stderr and rely on the user to check for errors via the #cairo_status_t + * return. + */ +static void +png_simple_error_callback (png_structp png, + png_const_charp error_msg) +{ + cairo_status_t *error = png_get_error_ptr (png); + + /* default to the most likely error */ + if (*error == CAIRO_STATUS_SUCCESS) + *error = _cairo_error (CAIRO_STATUS_NO_MEMORY); + +#ifdef PNG_SETJMP_SUPPORTED + longjmp (png_jmpbuf (png), 1); +#endif + + /* if we get here, then we have to choice but to abort ... */ +} + +static void +png_simple_warning_callback (png_structp png, + png_const_charp error_msg) +{ + cairo_status_t *error = png_get_error_ptr (png); + + /* default to the most likely error */ + if (*error == CAIRO_STATUS_SUCCESS) + *error = _cairo_error (CAIRO_STATUS_NO_MEMORY); + + /* png does not expect to abort and will try to tidy up after a warning */ +} + + +/* Starting with libpng-1.2.30, we must explicitly specify an output_flush_fn. + * Otherwise, we will segfault if we are writing to a stream. */ +static void +png_simple_output_flush_fn (png_structp png_ptr) +{ +} + +static cairo_status_t +write_png (cairo_surface_t *surface, + png_rw_ptr write_func, + void *closure) +{ + int i; + cairo_status_t status; + cairo_image_surface_t *image; + cairo_image_surface_t * volatile clone; + void *image_extra; + png_struct *png; + png_info *info; + png_byte **volatile rows = NULL; + png_color_16 white; + int png_color_type; + int depth; + + status = _cairo_surface_acquire_source_image (surface, + &image, + &image_extra); + + if (status == CAIRO_INT_STATUS_UNSUPPORTED) + return _cairo_error (CAIRO_STATUS_SURFACE_TYPE_MISMATCH); + else if (unlikely (status)) + return status; + + /* PNG complains about "Image width or height is zero in IHDR" */ + if (image->width == 0 || image->height == 0) { + status = _cairo_error (CAIRO_STATUS_WRITE_ERROR); + goto BAIL1; + } + + /* Handle the various fallback formats (e.g. low bit-depth XServers) + * by coercing them to a simpler format using pixman. + */ + clone = _cairo_image_surface_coerce (image); + status = clone->base.status; + if (unlikely (status)) + goto BAIL1; + + rows = _cairo_malloc_ab (clone->height, sizeof (png_byte*)); + if (unlikely (rows == NULL)) { + status = _cairo_error (CAIRO_STATUS_NO_MEMORY); + goto BAIL2; + } + + for (i = 0; i < clone->height; i++) + rows[i] = (png_byte *) clone->data + i * clone->stride; + + png = png_create_write_struct (PNG_LIBPNG_VER_STRING, &status, + png_simple_error_callback, + png_simple_warning_callback); + if (unlikely (png == NULL)) { + status = _cairo_error (CAIRO_STATUS_NO_MEMORY); + goto BAIL3; + } + + info = png_create_info_struct (png); + if (unlikely (info == NULL)) { + status = _cairo_error (CAIRO_STATUS_NO_MEMORY); + goto BAIL4; + } + +#ifdef PNG_SETJMP_SUPPORTED + if (setjmp (png_jmpbuf (png))) + goto BAIL4; +#endif + + png_set_write_fn (png, closure, write_func, png_simple_output_flush_fn); + + switch (clone->format) { + case CAIRO_FORMAT_ARGB32: + depth = 8; + if (_cairo_image_analyze_transparency (clone) == CAIRO_IMAGE_IS_OPAQUE) + png_color_type = PNG_COLOR_TYPE_RGB; + else + png_color_type = PNG_COLOR_TYPE_RGB_ALPHA; + break; + case CAIRO_FORMAT_RGB24: + depth = 8; + png_color_type = PNG_COLOR_TYPE_RGB; + break; + case CAIRO_FORMAT_A8: + depth = 8; + png_color_type = PNG_COLOR_TYPE_GRAY; + break; + case CAIRO_FORMAT_A1: + depth = 1; + png_color_type = PNG_COLOR_TYPE_GRAY; +#ifndef WORDS_BIGENDIAN + png_set_packswap (png); +#endif + break; + case CAIRO_FORMAT_INVALID: + case CAIRO_FORMAT_RGB16_565: + default: + status = _cairo_error (CAIRO_STATUS_INVALID_FORMAT); + goto BAIL4; + } + + png_set_IHDR (png, info, + clone->width, + clone->height, depth, + png_color_type, + PNG_INTERLACE_NONE, + PNG_COMPRESSION_TYPE_DEFAULT, + PNG_FILTER_TYPE_DEFAULT); + + white.gray = (1 << depth) - 1; + white.red = white.blue = white.green = white.gray; + png_set_bKGD (png, info, &white); + + if (0) { /* XXX extract meta-data from surface (i.e. creation date) */ + png_time pt; + + png_convert_from_time_t (&pt, time (NULL)); + png_set_tIME (png, info, &pt); + } + + /* We have to call png_write_info() before setting up the write + * transformation, since it stores data internally in 'png' + * that is needed for the write transformation functions to work. + */ + png_write_info (png, info); + + if (png_color_type == PNG_COLOR_TYPE_RGB_ALPHA) { + png_set_write_user_transform_fn (png, unpremultiply_data); + } else if (png_color_type == PNG_COLOR_TYPE_RGB) { + png_set_write_user_transform_fn (png, convert_data_to_bytes); + png_set_filler (png, 0, PNG_FILLER_AFTER); + } + + png_write_image (png, rows); + png_write_end (png, info); + +BAIL4: + png_destroy_write_struct (&png, &info); +BAIL3: + free (rows); +BAIL2: + cairo_surface_destroy (&clone->base); +BAIL1: + _cairo_surface_release_source_image (surface, image, image_extra); + + return status; +} + +static void +stdio_write_func (png_structp png, png_bytep data, png_size_t size) +{ + FILE *fp; + + fp = png_get_io_ptr (png); + while (size) { + size_t ret = fwrite (data, 1, size, fp); + size -= ret; + data += ret; + if (size && ferror (fp)) { + cairo_status_t *error = png_get_error_ptr (png); + if (*error == CAIRO_STATUS_SUCCESS) + *error = _cairo_error (CAIRO_STATUS_WRITE_ERROR); + png_error (png, NULL); + } + } +} + +/** + * cairo_surface_write_to_png: + * @surface: a #cairo_surface_t with pixel contents + * @filename: the name of a file to write to + * + * Writes the contents of @surface to a new file @filename as a PNG + * image. + * + * Return value: %CAIRO_STATUS_SUCCESS if the PNG file was written + * successfully. Otherwise, %CAIRO_STATUS_NO_MEMORY if memory could not + * be allocated for the operation or + * %CAIRO_STATUS_SURFACE_TYPE_MISMATCH if the surface does not have + * pixel contents, or %CAIRO_STATUS_WRITE_ERROR if an I/O error occurs + * while attempting to write the file. + **/ +cairo_status_t +cairo_surface_write_to_png (cairo_surface_t *surface, + const char *filename) +{ + FILE *fp; + cairo_status_t status; + + if (surface->status) + return surface->status; + + if (surface->finished) + return _cairo_error (CAIRO_STATUS_SURFACE_FINISHED); + + fp = fopen (filename, "wb"); + if (fp == NULL) { + switch (errno) { + case ENOMEM: + return _cairo_error (CAIRO_STATUS_NO_MEMORY); + default: + return _cairo_error (CAIRO_STATUS_WRITE_ERROR); + } + } + + status = write_png (surface, stdio_write_func, fp); + + if (fclose (fp) && status == CAIRO_STATUS_SUCCESS) + status = _cairo_error (CAIRO_STATUS_WRITE_ERROR); + + return status; +} + +struct png_write_closure_t { + cairo_write_func_t write_func; + void *closure; +}; + +static void +stream_write_func (png_structp png, png_bytep data, png_size_t size) +{ + cairo_status_t status; + struct png_write_closure_t *png_closure; + + png_closure = png_get_io_ptr (png); + status = png_closure->write_func (png_closure->closure, data, size); + if (unlikely (status)) { + cairo_status_t *error = png_get_error_ptr (png); + if (*error == CAIRO_STATUS_SUCCESS) + *error = status; + png_error (png, NULL); + } +} + +/** + * cairo_surface_write_to_png_stream: + * @surface: a #cairo_surface_t with pixel contents + * @write_func: a #cairo_write_func_t + * @closure: closure data for the write function + * + * Writes the image surface to the write function. + * + * Return value: %CAIRO_STATUS_SUCCESS if the PNG file was written + * successfully. Otherwise, %CAIRO_STATUS_NO_MEMORY is returned if + * memory could not be allocated for the operation, + * %CAIRO_STATUS_SURFACE_TYPE_MISMATCH if the surface does not have + * pixel contents. + **/ +cairo_status_t +cairo_surface_write_to_png_stream (cairo_surface_t *surface, + cairo_write_func_t write_func, + void *closure) +{ + struct png_write_closure_t png_closure; + + if (surface->status) + return surface->status; + + if (surface->finished) + return _cairo_error (CAIRO_STATUS_SURFACE_FINISHED); + + png_closure.write_func = write_func; + png_closure.closure = closure; + + return write_png (surface, stream_write_func, &png_closure); +} +slim_hidden_def (cairo_surface_write_to_png_stream); + +static inline int +multiply_alpha (int alpha, int color) +{ + int temp = (alpha * color) + 0x80; + return ((temp + (temp >> 8)) >> 8); +} + +/* Premultiplies data and converts RGBA bytes => native endian */ +static void +premultiply_data (png_structp png, + png_row_infop row_info, + png_bytep data) +{ + unsigned int i; + + for (i = 0; i < row_info->rowbytes; i += 4) { + uint8_t *base = &data[i]; + uint8_t alpha = base[3]; + uint32_t p; + + if (alpha == 0) { + p = 0; + } else { + uint8_t red = base[0]; + uint8_t green = base[1]; + uint8_t blue = base[2]; + + if (alpha != 0xff) { + red = multiply_alpha (alpha, red); + green = multiply_alpha (alpha, green); + blue = multiply_alpha (alpha, blue); + } + p = (alpha << 24) | (red << 16) | (green << 8) | (blue << 0); + } + memcpy (base, &p, sizeof (uint32_t)); + } +} + +/* Converts RGBx bytes to native endian xRGB */ +static void +convert_bytes_to_data (png_structp png, png_row_infop row_info, png_bytep data) +{ + unsigned int i; + + for (i = 0; i < row_info->rowbytes; i += 4) { + uint8_t *base = &data[i]; + uint8_t red = base[0]; + uint8_t green = base[1]; + uint8_t blue = base[2]; + uint32_t pixel; + + pixel = (0xff << 24) | (red << 16) | (green << 8) | (blue << 0); + memcpy (base, &pixel, sizeof (uint32_t)); + } +} + +static cairo_status_t +stdio_read_func (void *closure, unsigned char *data, unsigned int size) +{ + FILE *file = closure; + + while (size) { + size_t ret; + + ret = fread (data, 1, size, file); + size -= ret; + data += ret; + + if (size && (feof (file) || ferror (file))) + return _cairo_error (CAIRO_STATUS_READ_ERROR); + } + + return CAIRO_STATUS_SUCCESS; +} + +static void +stream_read_func (png_structp png, png_bytep data, png_size_t size) +{ + cairo_status_t status; + struct png_read_closure_t *png_closure; + + png_closure = png_get_io_ptr (png); + status = png_closure->read_func (png_closure->closure, data, size); + if (unlikely (status)) { + cairo_status_t *error = png_get_error_ptr (png); + if (*error == CAIRO_STATUS_SUCCESS) + *error = status; + png_error (png, NULL); + } + + _cairo_output_stream_write (png_closure->png_data, data, size); +} + +static cairo_surface_t * +read_png (struct png_read_closure_t *png_closure) +{ + cairo_surface_t *surface; + png_struct *png = NULL; + png_info *info; + png_byte *data = NULL; + png_byte **row_pointers = NULL; + png_uint_32 png_width, png_height; + int depth, color_type, interlace, stride; + unsigned int i; + cairo_format_t format; + cairo_status_t status; + unsigned char *mime_data; + unsigned long mime_data_length; + + png_closure->png_data = _cairo_memory_stream_create (); + + /* XXX: Perhaps we'll want some other error handlers? */ + png = png_create_read_struct (PNG_LIBPNG_VER_STRING, + &status, + png_simple_error_callback, + png_simple_warning_callback); + if (unlikely (png == NULL)) { + surface = _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_NO_MEMORY)); + goto BAIL; + } + + info = png_create_info_struct (png); + if (unlikely (info == NULL)) { + surface = _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_NO_MEMORY)); + goto BAIL; + } + + png_set_read_fn (png, png_closure, stream_read_func); + + status = CAIRO_STATUS_SUCCESS; +#ifdef PNG_SETJMP_SUPPORTED + if (setjmp (png_jmpbuf (png))) { + surface = _cairo_surface_create_in_error (status); + goto BAIL; + } +#endif + + png_read_info (png, info); + + png_get_IHDR (png, info, + &png_width, &png_height, &depth, + &color_type, &interlace, NULL, NULL); + if (unlikely (status)) { /* catch any early warnings */ + surface = _cairo_surface_create_in_error (status); + goto BAIL; + } + + /* convert palette/gray image to rgb */ + if (color_type == PNG_COLOR_TYPE_PALETTE) + png_set_palette_to_rgb (png); + + /* expand gray bit depth if needed */ + if (color_type == PNG_COLOR_TYPE_GRAY) { +#if PNG_LIBPNG_VER >= 10209 + png_set_expand_gray_1_2_4_to_8 (png); +#else + png_set_gray_1_2_4_to_8 (png); +#endif + } + + /* transform transparency to alpha */ + if (png_get_valid (png, info, PNG_INFO_tRNS)) + png_set_tRNS_to_alpha (png); + + if (depth == 16) + png_set_strip_16 (png); + + if (depth < 8) + png_set_packing (png); + + /* convert grayscale to RGB */ + if (color_type == PNG_COLOR_TYPE_GRAY || + color_type == PNG_COLOR_TYPE_GRAY_ALPHA) + { + png_set_gray_to_rgb (png); + } + + if (interlace != PNG_INTERLACE_NONE) + png_set_interlace_handling (png); + + png_set_filler (png, 0xff, PNG_FILLER_AFTER); + + /* recheck header after setting EXPAND options */ + png_read_update_info (png, info); + png_get_IHDR (png, info, + &png_width, &png_height, &depth, + &color_type, &interlace, NULL, NULL); + if (depth != 8 || + ! (color_type == PNG_COLOR_TYPE_RGB || + color_type == PNG_COLOR_TYPE_RGB_ALPHA)) + { + surface = _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_READ_ERROR)); + goto BAIL; + } + + switch (color_type) { + default: + ASSERT_NOT_REACHED; + /* fall-through just in case ;-) */ + + case PNG_COLOR_TYPE_RGB_ALPHA: + format = CAIRO_FORMAT_ARGB32; + png_set_read_user_transform_fn (png, premultiply_data); + break; + + case PNG_COLOR_TYPE_RGB: + format = CAIRO_FORMAT_RGB24; + png_set_read_user_transform_fn (png, convert_bytes_to_data); + break; + } + + stride = cairo_format_stride_for_width (format, png_width); + if (stride < 0) { + surface = _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_INVALID_STRIDE)); + goto BAIL; + } + + data = _cairo_malloc_ab (png_height, stride); + if (unlikely (data == NULL)) { + surface = _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_NO_MEMORY)); + goto BAIL; + } + + row_pointers = _cairo_malloc_ab (png_height, sizeof (char *)); + if (unlikely (row_pointers == NULL)) { + surface = _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_NO_MEMORY)); + goto BAIL; + } + + for (i = 0; i < png_height; i++) + row_pointers[i] = &data[i * stride]; + + png_read_image (png, row_pointers); + png_read_end (png, info); + + if (unlikely (status)) { /* catch any late warnings - probably hit an error already */ + surface = _cairo_surface_create_in_error (status); + goto BAIL; + } + + surface = cairo_image_surface_create_for_data (data, format, + png_width, png_height, + stride); + if (surface->status) + goto BAIL; + + _cairo_image_surface_assume_ownership_of_data ((cairo_image_surface_t*)surface); + data = NULL; + + _cairo_debug_check_image_surface_is_defined (surface); + + status = _cairo_memory_stream_destroy (png_closure->png_data, + &mime_data, + &mime_data_length); + png_closure->png_data = NULL; + if (unlikely (status)) { + cairo_surface_destroy (surface); + surface = _cairo_surface_create_in_error (status); + goto BAIL; + } + + status = cairo_surface_set_mime_data (surface, + CAIRO_MIME_TYPE_PNG, + mime_data, + mime_data_length, + free, + mime_data); + if (unlikely (status)) { + free (mime_data); + cairo_surface_destroy (surface); + surface = _cairo_surface_create_in_error (status); + goto BAIL; + } + + BAIL: + if (row_pointers != NULL) + free (row_pointers); + if (data != NULL) + free (data); + if (png != NULL) + png_destroy_read_struct (&png, &info, NULL); + if (png_closure->png_data != NULL) { + cairo_status_t status_ignored; + + status_ignored = _cairo_output_stream_destroy (png_closure->png_data); + } + + return surface; +} + +/** + * cairo_image_surface_create_from_png: + * @filename: name of PNG file to load + * + * Creates a new image surface and initializes the contents to the + * given PNG file. + * + * Return value: a new #cairo_surface_t initialized with the contents + * of the PNG file, or a "nil" surface if any error occurred. A nil + * surface can be checked for with cairo_surface_status(surface) which + * may return one of the following values: + * + * %CAIRO_STATUS_NO_MEMORY + * %CAIRO_STATUS_FILE_NOT_FOUND + * %CAIRO_STATUS_READ_ERROR + * + * Alternatively, you can allow errors to propagate through the drawing + * operations and check the status on the context upon completion + * using cairo_status(). + **/ +cairo_surface_t * +cairo_image_surface_create_from_png (const char *filename) +{ + struct png_read_closure_t png_closure; + cairo_surface_t *surface; + + png_closure.closure = fopen (filename, "rb"); + if (png_closure.closure == NULL) { + cairo_status_t status; + switch (errno) { + case ENOMEM: + status = _cairo_error (CAIRO_STATUS_NO_MEMORY); + break; + case ENOENT: + status = _cairo_error (CAIRO_STATUS_FILE_NOT_FOUND); + break; + default: + status = _cairo_error (CAIRO_STATUS_READ_ERROR); + break; + } + return _cairo_surface_create_in_error (status); + } + + png_closure.read_func = stdio_read_func; + + surface = read_png (&png_closure); + + fclose (png_closure.closure); + + return surface; +} + +/** + * cairo_image_surface_create_from_png_stream: + * @read_func: function called to read the data of the file + * @closure: data to pass to @read_func. + * + * Creates a new image surface from PNG data read incrementally + * via the @read_func function. + * + * Return value: a new #cairo_surface_t initialized with the contents + * of the PNG file or a "nil" surface if the data read is not a valid PNG image + * or memory could not be allocated for the operation. A nil + * surface can be checked for with cairo_surface_status(surface) which + * may return one of the following values: + * + * %CAIRO_STATUS_NO_MEMORY + * %CAIRO_STATUS_READ_ERROR + * + * Alternatively, you can allow errors to propagate through the drawing + * operations and check the status on the context upon completion + * using cairo_status(). + **/ +cairo_surface_t * +cairo_image_surface_create_from_png_stream (cairo_read_func_t read_func, + void *closure) +{ + struct png_read_closure_t png_closure; + + png_closure.read_func = read_func; + png_closure.closure = closure; + + return read_png (&png_closure); +} diff --git a/programs/develop/libraries/cairo/src/cairo-scaled-font-subsets.c b/programs/develop/libraries/cairo/src/cairo-scaled-font-subsets.c new file mode 100644 index 0000000000..01bc05bfbc --- /dev/null +++ b/programs/develop/libraries/cairo/src/cairo-scaled-font-subsets.c @@ -0,0 +1,1091 @@ +/* cairo - a vector graphics library with display and print output + * + * Copyright © 2003 University of Southern California + * Copyright © 2005 Red Hat, Inc + * Copyright © 2006 Keith Packard + * Copyright © 2006 Red Hat, Inc + * + * This library is free software; you can redistribute it and/or + * modify it either under the terms of the GNU Lesser General Public + * License version 2.1 as published by the Free Software Foundation + * (the "LGPL") or, at your option, under the terms of the Mozilla + * Public License Version 1.1 (the "MPL"). If you do not alter this + * notice, a recipient may use your version of this file under either + * the MPL or the LGPL. + * + * You should have received a copy of the LGPL along with this library + * in the file COPYING-LGPL-2.1; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA + * You should have received a copy of the MPL along with this library + * in the file COPYING-MPL-1.1 + * + * The contents of this file are subject to the Mozilla Public License + * Version 1.1 (the "License"); you may not use this file except in + * compliance with the License. You may obtain a copy of the License at + * http://www.mozilla.org/MPL/ + * + * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY + * OF ANY KIND, either express or implied. See the LGPL or the MPL for + * the specific language governing rights and limitations. + * + * The Original Code is the cairo graphics library. + * + * The Initial Developer of the Original Code is University of Southern + * California. + * + * Contributor(s): + * Carl D. Worth + * Kristian Høgsberg + * Keith Packard + * Adrian Johnson + */ + +#define _BSD_SOURCE /* for snprintf(), strdup() */ +#include "cairoint.h" +#include "cairo-error-private.h" + +#if CAIRO_HAS_FONT_SUBSET + +#include "cairo-scaled-font-subsets-private.h" +#include "cairo-user-font-private.h" + +#define MAX_GLYPHS_PER_SIMPLE_FONT 256 +#define MAX_GLYPHS_PER_COMPOSITE_FONT 65536 + +typedef enum { + CAIRO_SUBSETS_SCALED, + CAIRO_SUBSETS_SIMPLE, + CAIRO_SUBSETS_COMPOSITE +} cairo_subsets_type_t; + +typedef enum { + CAIRO_SUBSETS_FOREACH_UNSCALED, + CAIRO_SUBSETS_FOREACH_SCALED, + CAIRO_SUBSETS_FOREACH_USER +} cairo_subsets_foreach_type_t; + +typedef struct _cairo_sub_font { + cairo_hash_entry_t base; + + cairo_bool_t is_scaled; + cairo_bool_t is_composite; + cairo_bool_t is_user; + cairo_scaled_font_subsets_t *parent; + cairo_scaled_font_t *scaled_font; + unsigned int font_id; + + int current_subset; + int num_glyphs_in_current_subset; + int max_glyphs_per_subset; + + cairo_hash_table_t *sub_font_glyphs; + struct _cairo_sub_font *next; +} cairo_sub_font_t; + +struct _cairo_scaled_font_subsets { + cairo_subsets_type_t type; + + int max_glyphs_per_unscaled_subset_used; + cairo_hash_table_t *unscaled_sub_fonts; + cairo_sub_font_t *unscaled_sub_fonts_list; + cairo_sub_font_t *unscaled_sub_fonts_list_end; + + int max_glyphs_per_scaled_subset_used; + cairo_hash_table_t *scaled_sub_fonts; + cairo_sub_font_t *scaled_sub_fonts_list; + cairo_sub_font_t *scaled_sub_fonts_list_end; + + int num_sub_fonts; +}; + +typedef struct _cairo_sub_font_glyph { + cairo_hash_entry_t base; + + unsigned int subset_id; + unsigned int subset_glyph_index; + double x_advance; + double y_advance; + + cairo_bool_t is_mapped; + uint32_t unicode; + char *utf8; + int utf8_len; +} cairo_sub_font_glyph_t; + +typedef struct _cairo_sub_font_collection { + unsigned long *glyphs; /* scaled_font_glyph_index */ + char **utf8; + unsigned int glyphs_size; + unsigned int max_glyph; + unsigned int num_glyphs; + + unsigned int subset_id; + + cairo_status_t status; + cairo_scaled_font_subset_callback_func_t font_subset_callback; + void *font_subset_callback_closure; +} cairo_sub_font_collection_t; + +typedef struct _cairo_string_entry { + cairo_hash_entry_t base; + char *string; +} cairo_string_entry_t; + +static cairo_status_t +_cairo_sub_font_map_glyph (cairo_sub_font_t *sub_font, + unsigned long scaled_font_glyph_index, + const char * utf8, + int utf8_len, + cairo_scaled_font_subsets_glyph_t *subset_glyph); + +static void +_cairo_sub_font_glyph_init_key (cairo_sub_font_glyph_t *sub_font_glyph, + unsigned long scaled_font_glyph_index) +{ + sub_font_glyph->base.hash = scaled_font_glyph_index; +} + +static cairo_bool_t +_cairo_sub_font_glyphs_equal (const void *key_a, const void *key_b) +{ + const cairo_sub_font_glyph_t *sub_font_glyph_a = key_a; + const cairo_sub_font_glyph_t *sub_font_glyph_b = key_b; + + return sub_font_glyph_a->base.hash == sub_font_glyph_b->base.hash; +} + +static cairo_sub_font_glyph_t * +_cairo_sub_font_glyph_create (unsigned long scaled_font_glyph_index, + unsigned int subset_id, + unsigned int subset_glyph_index, + double x_advance, + double y_advance) +{ + cairo_sub_font_glyph_t *sub_font_glyph; + + sub_font_glyph = malloc (sizeof (cairo_sub_font_glyph_t)); + if (unlikely (sub_font_glyph == NULL)) { + _cairo_error_throw (CAIRO_STATUS_NO_MEMORY); + return NULL; + } + + _cairo_sub_font_glyph_init_key (sub_font_glyph, scaled_font_glyph_index); + sub_font_glyph->subset_id = subset_id; + sub_font_glyph->subset_glyph_index = subset_glyph_index; + sub_font_glyph->x_advance = x_advance; + sub_font_glyph->y_advance = y_advance; + sub_font_glyph->is_mapped = FALSE; + sub_font_glyph->unicode = -1; + sub_font_glyph->utf8 = NULL; + sub_font_glyph->utf8_len = 0; + + return sub_font_glyph; +} + +static void +_cairo_sub_font_glyph_destroy (cairo_sub_font_glyph_t *sub_font_glyph) +{ + if (sub_font_glyph->utf8 != NULL) + free (sub_font_glyph->utf8); + + free (sub_font_glyph); +} + +static void +_cairo_sub_font_glyph_pluck (void *entry, void *closure) +{ + cairo_sub_font_glyph_t *sub_font_glyph = entry; + cairo_hash_table_t *sub_font_glyphs = closure; + + _cairo_hash_table_remove (sub_font_glyphs, &sub_font_glyph->base); + _cairo_sub_font_glyph_destroy (sub_font_glyph); +} + +static void +_cairo_sub_font_glyph_collect (void *entry, void *closure) +{ + cairo_sub_font_glyph_t *sub_font_glyph = entry; + cairo_sub_font_collection_t *collection = closure; + unsigned long scaled_font_glyph_index; + unsigned int subset_glyph_index; + + if (sub_font_glyph->subset_id != collection->subset_id) + return; + + scaled_font_glyph_index = sub_font_glyph->base.hash; + subset_glyph_index = sub_font_glyph->subset_glyph_index; + + /* Ensure we don't exceed the allocated bounds. */ + assert (subset_glyph_index < collection->glyphs_size); + + collection->glyphs[subset_glyph_index] = scaled_font_glyph_index; + collection->utf8[subset_glyph_index] = sub_font_glyph->utf8; + if (subset_glyph_index > collection->max_glyph) + collection->max_glyph = subset_glyph_index; + + collection->num_glyphs++; +} + +static cairo_bool_t +_cairo_sub_fonts_equal (const void *key_a, const void *key_b) +{ + const cairo_sub_font_t *sub_font_a = key_a; + const cairo_sub_font_t *sub_font_b = key_b; + cairo_scaled_font_t *a = sub_font_a->scaled_font; + cairo_scaled_font_t *b = sub_font_b->scaled_font; + + if (sub_font_a->is_scaled) + return a == b; + else + return a->font_face == b->font_face || a->original_font_face == b->original_font_face; +} + +static void +_cairo_sub_font_init_key (cairo_sub_font_t *sub_font, + cairo_scaled_font_t *scaled_font) +{ + if (sub_font->is_scaled) + { + sub_font->base.hash = (unsigned long) scaled_font; + sub_font->scaled_font = scaled_font; + } + else + { + sub_font->base.hash = (unsigned long) scaled_font->font_face; + sub_font->scaled_font = scaled_font; + } +} + +static cairo_status_t +_cairo_sub_font_create (cairo_scaled_font_subsets_t *parent, + cairo_scaled_font_t *scaled_font, + unsigned int font_id, + int max_glyphs_per_subset, + cairo_bool_t is_scaled, + cairo_bool_t is_composite, + cairo_sub_font_t **sub_font_out) +{ + cairo_sub_font_t *sub_font; + cairo_status_t status; + cairo_scaled_font_subsets_glyph_t subset_glyph; + + sub_font = malloc (sizeof (cairo_sub_font_t)); + if (unlikely (sub_font == NULL)) + return _cairo_error (CAIRO_STATUS_NO_MEMORY); + + sub_font->is_scaled = is_scaled; + sub_font->is_composite = is_composite; + sub_font->is_user = _cairo_font_face_is_user (scaled_font->font_face); + _cairo_sub_font_init_key (sub_font, scaled_font); + + sub_font->parent = parent; + sub_font->scaled_font = scaled_font; + sub_font->font_id = font_id; + + sub_font->current_subset = 0; + sub_font->num_glyphs_in_current_subset = 0; + sub_font->max_glyphs_per_subset = max_glyphs_per_subset; + + sub_font->sub_font_glyphs = _cairo_hash_table_create (_cairo_sub_font_glyphs_equal); + if (unlikely (sub_font->sub_font_glyphs == NULL)) { + free (sub_font); + return _cairo_error (CAIRO_STATUS_NO_MEMORY); + } + sub_font->next = NULL; + + /* Reserve first glyph in subset for the .notdef glyph except for + * Type 3 fonts */ + if (! is_scaled) { + status = _cairo_sub_font_map_glyph (sub_font, 0, NULL, -1, &subset_glyph); + if (unlikely (status)) { + _cairo_hash_table_destroy (sub_font->sub_font_glyphs); + free (sub_font); + return status; + } + } + + *sub_font_out = sub_font; + return CAIRO_STATUS_SUCCESS; +} + +static void +_cairo_sub_font_destroy (cairo_sub_font_t *sub_font) +{ + _cairo_hash_table_foreach (sub_font->sub_font_glyphs, + _cairo_sub_font_glyph_pluck, + sub_font->sub_font_glyphs); + _cairo_hash_table_destroy (sub_font->sub_font_glyphs); + cairo_scaled_font_destroy (sub_font->scaled_font); + free (sub_font); +} + +static void +_cairo_sub_font_pluck (void *entry, void *closure) +{ + cairo_sub_font_t *sub_font = entry; + cairo_hash_table_t *sub_fonts = closure; + + _cairo_hash_table_remove (sub_fonts, &sub_font->base); + _cairo_sub_font_destroy (sub_font); +} + +static cairo_status_t +_cairo_sub_font_glyph_lookup_unicode (cairo_sub_font_glyph_t *sub_font_glyph, + cairo_scaled_font_t *scaled_font, + unsigned long scaled_font_glyph_index) +{ + uint32_t unicode; + char buf[8]; + int len; + cairo_status_t status; + + /* Do a reverse lookup on the glyph index. unicode is -1 if the + * index could not be mapped to a unicode character. */ + unicode = -1; + status = _cairo_truetype_index_to_ucs4 (scaled_font, + scaled_font_glyph_index, + &unicode); + if (_cairo_status_is_error (status)) + return status; + + if (unicode == (uint32_t)-1 && scaled_font->backend->index_to_ucs4) { + status = scaled_font->backend->index_to_ucs4 (scaled_font, + scaled_font_glyph_index, + &unicode); + if (unlikely (status)) + return status; + } + + sub_font_glyph->unicode = unicode; + sub_font_glyph->utf8 = NULL; + sub_font_glyph->utf8_len = 0; + if (unicode != (uint32_t) -1) { + len = _cairo_ucs4_to_utf8 (unicode, buf); + if (len > 0) { + sub_font_glyph->utf8 = malloc (len + 1); + if (unlikely (sub_font_glyph->utf8 == NULL)) + return _cairo_error (CAIRO_STATUS_NO_MEMORY); + + memcpy (sub_font_glyph->utf8, buf, len); + sub_font_glyph->utf8[len] = 0; + sub_font_glyph->utf8_len = len; + } + } + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_status_t +_cairo_sub_font_glyph_map_to_unicode (cairo_sub_font_glyph_t *sub_font_glyph, + const char *utf8, + int utf8_len, + cairo_bool_t *is_mapped) +{ + *is_mapped = FALSE; + + if (utf8_len < 0) + return CAIRO_STATUS_SUCCESS; + + if (utf8 != NULL && utf8_len != 0 && utf8[utf8_len - 1] == '\0') + utf8_len--; + + if (utf8 != NULL && utf8_len != 0) { + if (sub_font_glyph->utf8 != NULL) { + if (utf8_len == sub_font_glyph->utf8_len && + memcmp (utf8, sub_font_glyph->utf8, utf8_len) == 0) + { + /* Requested utf8 mapping matches the existing mapping */ + *is_mapped = TRUE; + } + } else { + /* No existing mapping. Use the requested mapping */ + sub_font_glyph->utf8 = malloc (utf8_len + 1); + if (unlikely (sub_font_glyph->utf8 == NULL)) + return _cairo_error (CAIRO_STATUS_NO_MEMORY); + + memcpy (sub_font_glyph->utf8, utf8, utf8_len); + sub_font_glyph->utf8[utf8_len] = 0; + sub_font_glyph->utf8_len = utf8_len; + *is_mapped = TRUE; + } + } + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_int_status_t +_cairo_sub_font_lookup_glyph (cairo_sub_font_t *sub_font, + unsigned long scaled_font_glyph_index, + const char *utf8, + int utf8_len, + cairo_scaled_font_subsets_glyph_t *subset_glyph) +{ + cairo_sub_font_glyph_t key, *sub_font_glyph; + cairo_int_status_t status; + + _cairo_sub_font_glyph_init_key (&key, scaled_font_glyph_index); + sub_font_glyph = _cairo_hash_table_lookup (sub_font->sub_font_glyphs, + &key.base); + if (sub_font_glyph != NULL) { + subset_glyph->font_id = sub_font->font_id; + subset_glyph->subset_id = sub_font_glyph->subset_id; + subset_glyph->subset_glyph_index = sub_font_glyph->subset_glyph_index; + subset_glyph->is_scaled = sub_font->is_scaled; + subset_glyph->is_composite = sub_font->is_composite; + subset_glyph->x_advance = sub_font_glyph->x_advance; + subset_glyph->y_advance = sub_font_glyph->y_advance; + status = _cairo_sub_font_glyph_map_to_unicode (sub_font_glyph, + utf8, utf8_len, + &subset_glyph->utf8_is_mapped); + subset_glyph->unicode = sub_font_glyph->unicode; + + return status; + } + + return CAIRO_INT_STATUS_UNSUPPORTED; +} + +static cairo_status_t +_cairo_sub_font_map_glyph (cairo_sub_font_t *sub_font, + unsigned long scaled_font_glyph_index, + const char *utf8, + int utf8_len, + cairo_scaled_font_subsets_glyph_t *subset_glyph) +{ + cairo_sub_font_glyph_t key, *sub_font_glyph; + cairo_status_t status; + + _cairo_sub_font_glyph_init_key (&key, scaled_font_glyph_index); + sub_font_glyph = _cairo_hash_table_lookup (sub_font->sub_font_glyphs, + &key.base); + if (sub_font_glyph == NULL) { + cairo_scaled_glyph_t *scaled_glyph; + + if (sub_font->num_glyphs_in_current_subset == sub_font->max_glyphs_per_subset) + { + cairo_scaled_font_subsets_glyph_t tmp_subset_glyph; + + sub_font->current_subset++; + sub_font->num_glyphs_in_current_subset = 0; + + /* Reserve first glyph in subset for the .notdef glyph + * except for Type 3 fonts */ + if (! _cairo_font_face_is_user (sub_font->scaled_font->font_face)) { + status = _cairo_sub_font_map_glyph (sub_font, 0, NULL, -1, &tmp_subset_glyph); + if (unlikely (status)) + return status; + } + } + + _cairo_scaled_font_freeze_cache (sub_font->scaled_font); + status = _cairo_scaled_glyph_lookup (sub_font->scaled_font, + scaled_font_glyph_index, + CAIRO_SCALED_GLYPH_INFO_METRICS, + &scaled_glyph); + assert (status != CAIRO_INT_STATUS_UNSUPPORTED); + if (unlikely (status)) { + _cairo_scaled_font_thaw_cache (sub_font->scaled_font); + return status; + } + + sub_font_glyph = _cairo_sub_font_glyph_create (scaled_font_glyph_index, + sub_font->current_subset, + sub_font->num_glyphs_in_current_subset, + scaled_glyph->metrics.x_advance, + scaled_glyph->metrics.y_advance); + _cairo_scaled_font_thaw_cache (sub_font->scaled_font); + + if (unlikely (sub_font_glyph == NULL)) + return _cairo_error (CAIRO_STATUS_NO_MEMORY); + + status = _cairo_sub_font_glyph_lookup_unicode (sub_font_glyph, + sub_font->scaled_font, + scaled_font_glyph_index); + if (unlikely (status)) { + _cairo_sub_font_glyph_destroy (sub_font_glyph); + return status; + } + + status = _cairo_hash_table_insert (sub_font->sub_font_glyphs, &sub_font_glyph->base); + if (unlikely (status)) { + _cairo_sub_font_glyph_destroy (sub_font_glyph); + return status; + } + + sub_font->num_glyphs_in_current_subset++; + + if (sub_font->is_scaled) { + if (sub_font->num_glyphs_in_current_subset > sub_font->parent->max_glyphs_per_scaled_subset_used) + sub_font->parent->max_glyphs_per_scaled_subset_used = sub_font->num_glyphs_in_current_subset; + } else { + if (sub_font->num_glyphs_in_current_subset > sub_font->parent->max_glyphs_per_unscaled_subset_used) + sub_font->parent->max_glyphs_per_unscaled_subset_used = sub_font->num_glyphs_in_current_subset; + } + } + + subset_glyph->font_id = sub_font->font_id; + subset_glyph->subset_id = sub_font_glyph->subset_id; + subset_glyph->subset_glyph_index = sub_font_glyph->subset_glyph_index; + subset_glyph->is_scaled = sub_font->is_scaled; + subset_glyph->is_composite = sub_font->is_composite; + subset_glyph->x_advance = sub_font_glyph->x_advance; + subset_glyph->y_advance = sub_font_glyph->y_advance; + status = _cairo_sub_font_glyph_map_to_unicode (sub_font_glyph, + utf8, utf8_len, + &subset_glyph->utf8_is_mapped); + subset_glyph->unicode = sub_font_glyph->unicode; + + return status; +} + +static void +_cairo_sub_font_collect (void *entry, void *closure) +{ + cairo_sub_font_t *sub_font = entry; + cairo_sub_font_collection_t *collection = closure; + cairo_scaled_font_subset_t subset; + int i; + unsigned int j; + + if (collection->status) + return; + + collection->status = sub_font->scaled_font->status; + if (collection->status) + return; + + for (i = 0; i <= sub_font->current_subset; i++) { + collection->subset_id = i; + collection->num_glyphs = 0; + collection->max_glyph = 0; + + _cairo_hash_table_foreach (sub_font->sub_font_glyphs, + _cairo_sub_font_glyph_collect, collection); + if (collection->status) + break; + if (collection->num_glyphs == 0) + continue; + + /* Ensure the resulting array has no uninitialized holes */ + assert (collection->num_glyphs == collection->max_glyph + 1); + + subset.scaled_font = sub_font->scaled_font; + subset.is_composite = sub_font->is_composite; + subset.is_scaled = sub_font->is_scaled; + subset.font_id = sub_font->font_id; + subset.subset_id = i; + subset.glyphs = collection->glyphs; + subset.utf8 = collection->utf8; + subset.num_glyphs = collection->num_glyphs; + subset.glyph_names = NULL; + /* No need to check for out of memory here. If to_unicode is NULL, the PDF + * surface does not emit an ToUnicode stream */ + subset.to_unicode = _cairo_malloc_ab (collection->num_glyphs, sizeof (unsigned long)); + if (subset.to_unicode) { + for (j = 0; j < collection->num_glyphs; j++) { + /* default unicode character required when mapping fails */ + subset.to_unicode[j] = 0xfffd; + } + } + collection->status = (collection->font_subset_callback) (&subset, + collection->font_subset_callback_closure); + + if (subset.to_unicode != NULL) + free (subset.to_unicode); + + if (subset.glyph_names != NULL) { + for (j = 0; j < collection->num_glyphs; j++) + free (subset.glyph_names[j]); + free (subset.glyph_names); + } + + if (collection->status) + break; + } +} + +static cairo_scaled_font_subsets_t * +_cairo_scaled_font_subsets_create_internal (cairo_subsets_type_t type) +{ + cairo_scaled_font_subsets_t *subsets; + + subsets = malloc (sizeof (cairo_scaled_font_subsets_t)); + if (unlikely (subsets == NULL)) { + _cairo_error_throw (CAIRO_STATUS_NO_MEMORY); + return NULL; + } + + subsets->type = type; + subsets->max_glyphs_per_unscaled_subset_used = 0; + subsets->max_glyphs_per_scaled_subset_used = 0; + subsets->num_sub_fonts = 0; + + subsets->unscaled_sub_fonts = _cairo_hash_table_create (_cairo_sub_fonts_equal); + if (! subsets->unscaled_sub_fonts) { + free (subsets); + return NULL; + } + subsets->unscaled_sub_fonts_list = NULL; + subsets->unscaled_sub_fonts_list_end = NULL; + + subsets->scaled_sub_fonts = _cairo_hash_table_create (_cairo_sub_fonts_equal); + if (! subsets->scaled_sub_fonts) { + _cairo_hash_table_destroy (subsets->unscaled_sub_fonts); + free (subsets); + return NULL; + } + subsets->scaled_sub_fonts_list = NULL; + subsets->scaled_sub_fonts_list_end = NULL; + + return subsets; +} + +cairo_scaled_font_subsets_t * +_cairo_scaled_font_subsets_create_scaled (void) +{ + return _cairo_scaled_font_subsets_create_internal (CAIRO_SUBSETS_SCALED); +} + +cairo_scaled_font_subsets_t * +_cairo_scaled_font_subsets_create_simple (void) +{ + return _cairo_scaled_font_subsets_create_internal (CAIRO_SUBSETS_SIMPLE); +} + +cairo_scaled_font_subsets_t * +_cairo_scaled_font_subsets_create_composite (void) +{ + return _cairo_scaled_font_subsets_create_internal (CAIRO_SUBSETS_COMPOSITE); +} + +void +_cairo_scaled_font_subsets_destroy (cairo_scaled_font_subsets_t *subsets) +{ + _cairo_hash_table_foreach (subsets->scaled_sub_fonts, _cairo_sub_font_pluck, subsets->scaled_sub_fonts); + _cairo_hash_table_destroy (subsets->scaled_sub_fonts); + + _cairo_hash_table_foreach (subsets->unscaled_sub_fonts, _cairo_sub_font_pluck, subsets->unscaled_sub_fonts); + _cairo_hash_table_destroy (subsets->unscaled_sub_fonts); + + free (subsets); +} + +cairo_status_t +_cairo_scaled_font_subsets_map_glyph (cairo_scaled_font_subsets_t *subsets, + cairo_scaled_font_t *scaled_font, + unsigned long scaled_font_glyph_index, + const char * utf8, + int utf8_len, + cairo_scaled_font_subsets_glyph_t *subset_glyph) +{ + cairo_sub_font_t key, *sub_font; + cairo_scaled_glyph_t *scaled_glyph; + cairo_font_face_t *font_face; + cairo_matrix_t identity; + cairo_font_options_t font_options; + cairo_scaled_font_t *unscaled_font; + cairo_status_t status; + int max_glyphs; + cairo_bool_t type1_font; + + /* Lookup glyph in unscaled subsets */ + if (subsets->type != CAIRO_SUBSETS_SCALED) { + key.is_scaled = FALSE; + _cairo_sub_font_init_key (&key, scaled_font); + sub_font = _cairo_hash_table_lookup (subsets->unscaled_sub_fonts, + &key.base); + if (sub_font != NULL) { + status = _cairo_sub_font_lookup_glyph (sub_font, + scaled_font_glyph_index, + utf8, utf8_len, + subset_glyph); + if (status != CAIRO_INT_STATUS_UNSUPPORTED) + return status; + } + } + + /* Lookup glyph in scaled subsets */ + key.is_scaled = TRUE; + _cairo_sub_font_init_key (&key, scaled_font); + sub_font = _cairo_hash_table_lookup (subsets->scaled_sub_fonts, + &key.base); + if (sub_font != NULL) { + status = _cairo_sub_font_lookup_glyph (sub_font, + scaled_font_glyph_index, + utf8, utf8_len, + subset_glyph); + if (status != CAIRO_INT_STATUS_UNSUPPORTED) + return status; + } + + /* Glyph not found. Determine whether the glyph is outline or + * bitmap and add to the appropriate subset. + * + * glyph_index 0 (the .notdef glyph) is a special case. Some fonts + * will return CAIRO_INT_STATUS_UNSUPPORTED when doing a + * _scaled_glyph_lookup(_GLYPH_INFO_PATH). Type1-fallback creates + * empty glyphs in this case so we can put the glyph in a unscaled + * subset. */ + if (scaled_font_glyph_index == 0 || + _cairo_font_face_is_user (scaled_font->font_face)) { + status = CAIRO_STATUS_SUCCESS; + } else { + _cairo_scaled_font_freeze_cache (scaled_font); + status = _cairo_scaled_glyph_lookup (scaled_font, + scaled_font_glyph_index, + CAIRO_SCALED_GLYPH_INFO_PATH, + &scaled_glyph); + _cairo_scaled_font_thaw_cache (scaled_font); + } + if (_cairo_status_is_error (status)) + return status; + + if (status == CAIRO_STATUS_SUCCESS && + subsets->type != CAIRO_SUBSETS_SCALED && + ! _cairo_font_face_is_user (scaled_font->font_face)) + { + /* Path available. Add to unscaled subset. */ + key.is_scaled = FALSE; + _cairo_sub_font_init_key (&key, scaled_font); + sub_font = _cairo_hash_table_lookup (subsets->unscaled_sub_fonts, + &key.base); + if (sub_font == NULL) { + font_face = cairo_scaled_font_get_font_face (scaled_font); + cairo_matrix_init_identity (&identity); + _cairo_font_options_init_default (&font_options); + cairo_font_options_set_hint_style (&font_options, CAIRO_HINT_STYLE_NONE); + cairo_font_options_set_hint_metrics (&font_options, CAIRO_HINT_METRICS_OFF); + unscaled_font = cairo_scaled_font_create (font_face, + &identity, + &identity, + &font_options); + if (unlikely (unscaled_font->status)) + return unscaled_font->status; + + subset_glyph->is_scaled = FALSE; + type1_font = FALSE; +#if CAIRO_HAS_FT_FONT + type1_font = _cairo_type1_scaled_font_is_type1 (unscaled_font); +#endif + if (subsets->type == CAIRO_SUBSETS_COMPOSITE && !type1_font) { + max_glyphs = MAX_GLYPHS_PER_COMPOSITE_FONT; + subset_glyph->is_composite = TRUE; + } else { + max_glyphs = MAX_GLYPHS_PER_SIMPLE_FONT; + subset_glyph->is_composite = FALSE; + } + + status = _cairo_sub_font_create (subsets, + unscaled_font, + subsets->num_sub_fonts, + max_glyphs, + subset_glyph->is_scaled, + subset_glyph->is_composite, + &sub_font); + + if (unlikely (status)) { + cairo_scaled_font_destroy (unscaled_font); + return status; + } + + status = _cairo_hash_table_insert (subsets->unscaled_sub_fonts, + &sub_font->base); + + if (unlikely (status)) { + _cairo_sub_font_destroy (sub_font); + return status; + } + if (!subsets->unscaled_sub_fonts_list) + subsets->unscaled_sub_fonts_list = sub_font; + else + subsets->unscaled_sub_fonts_list_end->next = sub_font; + subsets->unscaled_sub_fonts_list_end = sub_font; + subsets->num_sub_fonts++; + } + } else { + /* No path available. Add to scaled subset. */ + key.is_scaled = TRUE; + _cairo_sub_font_init_key (&key, scaled_font); + sub_font = _cairo_hash_table_lookup (subsets->scaled_sub_fonts, + &key.base); + if (sub_font == NULL) { + subset_glyph->is_scaled = TRUE; + subset_glyph->is_composite = FALSE; + if (subsets->type == CAIRO_SUBSETS_SCALED) + max_glyphs = INT_MAX; + else + max_glyphs = MAX_GLYPHS_PER_SIMPLE_FONT; + + status = _cairo_sub_font_create (subsets, + cairo_scaled_font_reference (scaled_font), + subsets->num_sub_fonts, + max_glyphs, + subset_glyph->is_scaled, + subset_glyph->is_composite, + &sub_font); + if (unlikely (status)) { + cairo_scaled_font_destroy (scaled_font); + return status; + } + + status = _cairo_hash_table_insert (subsets->scaled_sub_fonts, + &sub_font->base); + if (unlikely (status)) { + _cairo_sub_font_destroy (sub_font); + return status; + } + if (!subsets->scaled_sub_fonts_list) + subsets->scaled_sub_fonts_list = sub_font; + else + subsets->scaled_sub_fonts_list_end->next = sub_font; + subsets->scaled_sub_fonts_list_end = sub_font; + subsets->num_sub_fonts++; + } + } + + return _cairo_sub_font_map_glyph (sub_font, + scaled_font_glyph_index, + utf8, utf8_len, + subset_glyph); +} + +static cairo_status_t +_cairo_scaled_font_subsets_foreach_internal (cairo_scaled_font_subsets_t *font_subsets, + cairo_scaled_font_subset_callback_func_t font_subset_callback, + void *closure, + cairo_subsets_foreach_type_t type) +{ + cairo_sub_font_collection_t collection; + cairo_sub_font_t *sub_font; + cairo_bool_t is_scaled, is_user; + + is_scaled = FALSE; + is_user = FALSE; + + if (type == CAIRO_SUBSETS_FOREACH_USER) + is_user = TRUE; + + if (type == CAIRO_SUBSETS_FOREACH_SCALED || + type == CAIRO_SUBSETS_FOREACH_USER) + { + is_scaled = TRUE; + } + + if (is_scaled) + collection.glyphs_size = font_subsets->max_glyphs_per_scaled_subset_used; + else + collection.glyphs_size = font_subsets->max_glyphs_per_unscaled_subset_used; + + if (! collection.glyphs_size) + return CAIRO_STATUS_SUCCESS; + + collection.glyphs = _cairo_malloc_ab (collection.glyphs_size, sizeof(unsigned long)); + collection.utf8 = _cairo_malloc_ab (collection.glyphs_size, sizeof(char *)); + if (unlikely (collection.glyphs == NULL || collection.utf8 == NULL)) { + if (collection.glyphs != NULL) + free (collection.glyphs); + if (collection.utf8 != NULL) + free (collection.utf8); + + return _cairo_error (CAIRO_STATUS_NO_MEMORY); + } + + collection.font_subset_callback = font_subset_callback; + collection.font_subset_callback_closure = closure; + collection.status = CAIRO_STATUS_SUCCESS; + + if (is_scaled) + sub_font = font_subsets->scaled_sub_fonts_list; + else + sub_font = font_subsets->unscaled_sub_fonts_list; + + while (sub_font) { + if (sub_font->is_user == is_user) + _cairo_sub_font_collect (sub_font, &collection); + + sub_font = sub_font->next; + } + free (collection.utf8); + free (collection.glyphs); + + return collection.status; +} + +cairo_status_t +_cairo_scaled_font_subsets_foreach_scaled (cairo_scaled_font_subsets_t *font_subsets, + cairo_scaled_font_subset_callback_func_t font_subset_callback, + void *closure) +{ + return _cairo_scaled_font_subsets_foreach_internal (font_subsets, + font_subset_callback, + closure, + CAIRO_SUBSETS_FOREACH_SCALED); +} + +cairo_status_t +_cairo_scaled_font_subsets_foreach_unscaled (cairo_scaled_font_subsets_t *font_subsets, + cairo_scaled_font_subset_callback_func_t font_subset_callback, + void *closure) +{ + return _cairo_scaled_font_subsets_foreach_internal (font_subsets, + font_subset_callback, + closure, + CAIRO_SUBSETS_FOREACH_UNSCALED); +} + +cairo_status_t +_cairo_scaled_font_subsets_foreach_user (cairo_scaled_font_subsets_t *font_subsets, + cairo_scaled_font_subset_callback_func_t font_subset_callback, + void *closure) +{ + return _cairo_scaled_font_subsets_foreach_internal (font_subsets, + font_subset_callback, + closure, + CAIRO_SUBSETS_FOREACH_USER); +} + +static cairo_bool_t +_cairo_string_equal (const void *key_a, const void *key_b) +{ + const cairo_string_entry_t *a = key_a; + const cairo_string_entry_t *b = key_b; + + if (strcmp (a->string, b->string) == 0) + return TRUE; + else + return FALSE; +} + +static void +_cairo_string_init_key (cairo_string_entry_t *key, char *s) +{ + unsigned long sum = 0; + unsigned int i; + + for (i = 0; i < strlen(s); i++) + sum += s[i]; + key->base.hash = sum; + key->string = s; +} + +static cairo_status_t +create_string_entry (char *s, cairo_string_entry_t **entry) +{ + *entry = malloc (sizeof (cairo_string_entry_t)); + if (unlikely (*entry == NULL)) + return _cairo_error (CAIRO_STATUS_NO_MEMORY); + + _cairo_string_init_key (*entry, s); + + return CAIRO_STATUS_SUCCESS; +} + +static void +_pluck_entry (void *entry, void *closure) +{ + _cairo_hash_table_remove (closure, entry); + free (entry); +} + +cairo_int_status_t +_cairo_scaled_font_subset_create_glyph_names (cairo_scaled_font_subset_t *subset) +{ + unsigned int i; + cairo_hash_table_t *names; + cairo_string_entry_t key, *entry; + char buf[30]; + char *utf8; + uint16_t *utf16; + int utf16_len; + cairo_status_t status = CAIRO_STATUS_SUCCESS; + + names = _cairo_hash_table_create (_cairo_string_equal); + if (unlikely (names == NULL)) + return _cairo_error (CAIRO_STATUS_NO_MEMORY); + + subset->glyph_names = calloc (subset->num_glyphs, sizeof (char *)); + if (unlikely (subset->glyph_names == NULL)) { + status = _cairo_error (CAIRO_STATUS_NO_MEMORY); + goto CLEANUP_HASH; + } + + i = 0; + if (! subset->is_scaled) { + subset->glyph_names[0] = strdup (".notdef"); + if (unlikely (subset->glyph_names[0] == NULL)) { + status = _cairo_error (CAIRO_STATUS_NO_MEMORY); + goto CLEANUP_HASH; + } + + status = create_string_entry (subset->glyph_names[0], &entry); + if (unlikely (status)) + goto CLEANUP_HASH; + + status = _cairo_hash_table_insert (names, &entry->base); + if (unlikely (status)) { + free (entry); + goto CLEANUP_HASH; + } + i++; + } + + for (; i < subset->num_glyphs; i++) { + utf8 = subset->utf8[i]; + utf16 = NULL; + utf16_len = 0; + if (utf8 && *utf8) { + status = _cairo_utf8_to_utf16 (utf8, -1, &utf16, &utf16_len); + if (unlikely (status)) + goto CLEANUP_HASH; + } + + if (utf16_len == 1) { + snprintf (buf, sizeof (buf), "uni%04X", (int) utf16[0]); + _cairo_string_init_key (&key, buf); + entry = _cairo_hash_table_lookup (names, &key.base); + if (entry != NULL) + snprintf (buf, sizeof (buf), "g%d", i); + } else { + snprintf (buf, sizeof (buf), "g%d", i); + } + if (utf16) + free (utf16); + + subset->glyph_names[i] = strdup (buf); + if (unlikely (subset->glyph_names[i] == NULL)) { + status = _cairo_error (CAIRO_STATUS_NO_MEMORY); + goto CLEANUP_HASH; + } + + status = create_string_entry (subset->glyph_names[i], &entry); + if (unlikely (status)) + goto CLEANUP_HASH; + + status = _cairo_hash_table_insert (names, &entry->base); + if (unlikely (status)) { + free (entry); + goto CLEANUP_HASH; + } + } + +CLEANUP_HASH: + _cairo_hash_table_foreach (names, _pluck_entry, names); + _cairo_hash_table_destroy (names); + + if (likely (status == CAIRO_STATUS_SUCCESS)) + return CAIRO_STATUS_SUCCESS; + + if (subset->glyph_names != NULL) { + for (i = 0; i < subset->num_glyphs; i++) { + if (subset->glyph_names[i] != NULL) + free (subset->glyph_names[i]); + } + + free (subset->glyph_names); + subset->glyph_names = NULL; + } + + return status; +} + +#endif /* CAIRO_HAS_FONT_SUBSET */ diff --git a/programs/develop/libraries/cairo/src/cairo-svg-surface.c b/programs/develop/libraries/cairo/src/cairo-svg-surface.c new file mode 100644 index 0000000000..fb612fadf5 --- /dev/null +++ b/programs/develop/libraries/cairo/src/cairo-svg-surface.c @@ -0,0 +1,2848 @@ +/* vim: set sw=4 sts=4: -*- Mode: c; tab-width: 8; c-basic-offset: 4; indent-tabs-mode: t; -*- */ +/* cairo - a vector graphics library with display and print output + * + * Copyright © 2004 Red Hat, Inc + * Copyright © 2005-2007 Emmanuel Pacaud + * Copyright © 2006 Red Hat, Inc + * + * This library is free software; you can redistribute it and/or + * modify it either under the terms of the GNU Lesser General Public + * License version 2.1 as published by the Free Software Foundation + * (the "LGPL") or, at your option, under the terms of the Mozilla + * Public License Version 1.1 (the "MPL"). If you do not alter this + * notice, a recipient may use your version of this file under either + * the MPL or the LGPL. + * + * You should have received a copy of the LGPL along with this library + * in the file COPYING-LGPL-2.1; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA + * You should have received a copy of the MPL along with this library + * in the file COPYING-MPL-1.1 + * + * The contents of this file are subject to the Mozilla Public License + * Version 1.1 (the "License"); you may not use this file except in + * compliance with the License. You may obtain a copy of the License at + * http://www.mozilla.org/MPL/ + * + * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY + * OF ANY KIND, either express or implied. See the LGPL or the MPL for + * the specific language governing rights and limitations. + * + * The Original Code is the cairo graphics library. + * + * The Initial Developer of the Original Code is University of Southern + * California. + * + * Contributor(s): + * Kristian Høgsberg + * Emmanuel Pacaud + * Carl Worth + */ + +#define _BSD_SOURCE /* for snprintf() */ +#include "cairoint.h" +#include "cairo-svg.h" +#include "cairo-analysis-surface-private.h" +#include "cairo-error-private.h" +#include "cairo-image-info-private.h" +#include "cairo-recording-surface-private.h" +#include "cairo-output-stream-private.h" +#include "cairo-path-fixed-private.h" +#include "cairo-paginated-private.h" +#include "cairo-scaled-font-subsets-private.h" +#include "cairo-surface-clipper-private.h" +#include "cairo-svg-surface-private.h" + +/** + * SECTION:cairo-svg + * @Title: SVG Surfaces + * @Short_Description: Rendering SVG documents + * @See_Also: #cairo_surface_t + * + * The SVG surface is used to render cairo graphics to + * SVG files and is a multi-page vector surface backend. + */ + +/** + * CAIRO_HAS_SVG_SURFACE: + * + * Defined if the SVG surface backend is available. + * This macro can be used to conditionally compile backend-specific code. + */ + +typedef struct cairo_svg_page cairo_svg_page_t; + +static const int invalid_pattern_id = -1; + +static const cairo_svg_version_t _cairo_svg_versions[] = +{ + CAIRO_SVG_VERSION_1_1, + CAIRO_SVG_VERSION_1_2 +}; + +#define CAIRO_SVG_VERSION_LAST ARRAY_LENGTH (_cairo_svg_versions) + +static void +_cairo_svg_surface_emit_path (cairo_output_stream_t *output, + cairo_path_fixed_t *path, + const cairo_matrix_t *ctm_inverse); + +static cairo_bool_t +_cairo_svg_version_has_page_set_support (cairo_svg_version_t version) +{ + return version > CAIRO_SVG_VERSION_1_1; +} + +static const char * _cairo_svg_version_strings[CAIRO_SVG_VERSION_LAST] = +{ + "SVG 1.1", + "SVG 1.2" +}; + +static const char * _cairo_svg_internal_version_strings[CAIRO_SVG_VERSION_LAST] = +{ + "1.1", + "1.2" +}; + +struct cairo_svg_page { + unsigned int surface_id; + unsigned int clip_level; + cairo_output_stream_t *xml_node; +}; + +struct cairo_svg_document { + cairo_output_stream_t *output_stream; + unsigned long refcount; + cairo_surface_t *owner; + cairo_bool_t finished; + + double width; + double height; + + cairo_output_stream_t *xml_node_defs; + cairo_output_stream_t *xml_node_glyphs; + + unsigned int linear_pattern_id; + unsigned int radial_pattern_id; + unsigned int pattern_id; + unsigned int filter_id; + unsigned int clip_id; + unsigned int mask_id; + + cairo_bool_t alpha_filter; + + cairo_svg_version_t svg_version; + + cairo_scaled_font_subsets_t *font_subsets; +}; + +static cairo_status_t +_cairo_svg_document_create (cairo_output_stream_t *stream, + double width, + double height, + cairo_svg_version_t version, + cairo_svg_document_t **document_out); + +static cairo_status_t +_cairo_svg_document_destroy (cairo_svg_document_t *document); + +static cairo_status_t +_cairo_svg_document_finish (cairo_svg_document_t *document); + +static cairo_svg_document_t * +_cairo_svg_document_reference (cairo_svg_document_t *document); + +static unsigned int +_cairo_svg_document_allocate_mask_id (cairo_svg_document_t *document); + +static cairo_surface_t * +_cairo_svg_surface_create_for_document (cairo_svg_document_t *document, + cairo_content_t content, + double width, + double height); +static cairo_surface_t * +_cairo_svg_surface_create_for_stream_internal (cairo_output_stream_t *stream, + double width, + double height, + cairo_svg_version_t version); + +static const cairo_surface_backend_t cairo_svg_surface_backend; +static const cairo_paginated_surface_backend_t cairo_svg_surface_paginated_backend; + +/** + * cairo_svg_surface_create_for_stream: + * @write_func: a #cairo_write_func_t to accept the output data, may be %NULL + * to indicate a no-op @write_func. With a no-op @write_func, + * the surface may be queried or used as a source without + * generating any temporary files. + * @closure: the closure argument for @write_func + * @width_in_points: width of the surface, in points (1 point == 1/72.0 inch) + * @height_in_points: height of the surface, in points (1 point == 1/72.0 inch) + * + * Creates a SVG surface of the specified size in points to be written + * incrementally to the stream represented by @write_func and @closure. + * + * Return value: a pointer to the newly created surface. The caller + * owns the surface and should call cairo_surface_destroy() when done + * with it. + * + * This function always returns a valid pointer, but it will return a + * pointer to a "nil" surface if an error such as out of memory + * occurs. You can use cairo_surface_status() to check for this. + * + * Since: 1.2 + */ +cairo_surface_t * +cairo_svg_surface_create_for_stream (cairo_write_func_t write_func, + void *closure, + double width, + double height) +{ + cairo_output_stream_t *stream; + + stream = _cairo_output_stream_create (write_func, NULL, closure); + if (_cairo_output_stream_get_status (stream)) + return _cairo_surface_create_in_error (_cairo_output_stream_destroy (stream)); + + return _cairo_svg_surface_create_for_stream_internal (stream, width, height, CAIRO_SVG_VERSION_1_1); +} + +/** + * cairo_svg_surface_create: + * @filename: a filename for the SVG output (must be writable), %NULL may be + * used to specify no output. This will generate a SVG surface that + * may be queried and used as a source, without generating a + * temporary file. + * @width_in_points: width of the surface, in points (1 point == 1/72.0 inch) + * @height_in_points: height of the surface, in points (1 point == 1/72.0 inch) + * + * Creates a SVG surface of the specified size in points to be written + * to @filename. + * + * The SVG surface backend recognizes the following MIME types for the + * data attached to a surface (see cairo_surface_set_mime_data()) when + * it is used as a source pattern for drawing on this surface: + * %CAIRO_MIME_TYPE_JPEG, %CAIRO_MIME_TYPE_PNG, + * %CAIRO_MIME_TYPE_URI. If any of them is specified, the SVG backend + * emits a href with the content of MIME data instead of a surface + * snapshot (PNG, Base64-encoded) in the corresponding image tag. + * + * The unofficial MIME type %CAIRO_MIME_TYPE_URI is examined + * first. If present, the URI is emitted as is: assuring the + * correctness of URI is left to the client code. + * + * If %CAIRO_MIME_TYPE_URI is not present, but %CAIRO_MIME_TYPE_JPEG + * or %CAIRO_MIME_TYPE_PNG is specified, the corresponding data is + * Base64-encoded and emitted. + * + * Return value: a pointer to the newly created surface. The caller + * owns the surface and should call cairo_surface_destroy() when done + * with it. + * + * This function always returns a valid pointer, but it will return a + * pointer to a "nil" surface if an error such as out of memory + * occurs. You can use cairo_surface_status() to check for this. + * + * Since: 1.2 + **/ +cairo_surface_t * +cairo_svg_surface_create (const char *filename, + double width, + double height) +{ + cairo_output_stream_t *stream; + + stream = _cairo_output_stream_create_for_filename (filename); + if (_cairo_output_stream_get_status (stream)) + return _cairo_surface_create_in_error (_cairo_output_stream_destroy (stream)); + + return _cairo_svg_surface_create_for_stream_internal (stream, width, height, CAIRO_SVG_VERSION_1_1); +} + +static cairo_bool_t +_cairo_surface_is_svg (cairo_surface_t *surface) +{ + return surface->backend == &cairo_svg_surface_backend; +} + +/* If the abstract_surface is a paginated surface, and that paginated + * surface's target is a svg_surface, then set svg_surface to that + * target. Otherwise return FALSE. + */ +static cairo_bool_t +_extract_svg_surface (cairo_surface_t *surface, + cairo_svg_surface_t **svg_surface) +{ + cairo_surface_t *target; + cairo_status_t status_ignored; + + if (surface->status) + return FALSE; + if (surface->finished) { + status_ignored = _cairo_surface_set_error (surface, + _cairo_error (CAIRO_STATUS_SURFACE_FINISHED)); + return FALSE; + } + + if (! _cairo_surface_is_paginated (surface)) { + status_ignored = _cairo_surface_set_error (surface, + _cairo_error (CAIRO_STATUS_SURFACE_TYPE_MISMATCH)); + return FALSE; + } + + target = _cairo_paginated_surface_get_target (surface); + if (target->status) { + status_ignored = _cairo_surface_set_error (surface, + target->status); + return FALSE; + } + if (target->finished) { + status_ignored = _cairo_surface_set_error (surface, + _cairo_error (CAIRO_STATUS_SURFACE_FINISHED)); + return FALSE; + } + + if (! _cairo_surface_is_svg (target)) { + status_ignored = _cairo_surface_set_error (surface, + _cairo_error (CAIRO_STATUS_SURFACE_TYPE_MISMATCH)); + return FALSE; + } + + *svg_surface = (cairo_svg_surface_t *) target; + return TRUE; +} + +/** + * cairo_svg_surface_restrict_to_version: + * @surface: a SVG #cairo_surface_t + * @version: SVG version + * + * Restricts the generated SVG file to @version. See cairo_svg_get_versions() + * for a list of available version values that can be used here. + * + * This function should only be called before any drawing operations + * have been performed on the given surface. The simplest way to do + * this is to call this function immediately after creating the + * surface. + * + * Since: 1.2 + **/ +void +cairo_svg_surface_restrict_to_version (cairo_surface_t *abstract_surface, + cairo_svg_version_t version) +{ + cairo_svg_surface_t *surface = NULL; /* hide compiler warning */ + + if (! _extract_svg_surface (abstract_surface, &surface)) + return; + + if (version < CAIRO_SVG_VERSION_LAST) + surface->document->svg_version = version; +} + +/** + * cairo_svg_get_versions: + * @versions: supported version list + * @num_versions: list length + * + * Used to retrieve the list of supported versions. See + * cairo_svg_surface_restrict_to_version(). + * + * Since: 1.2 + **/ +void +cairo_svg_get_versions (cairo_svg_version_t const **versions, + int *num_versions) +{ + if (versions != NULL) + *versions = _cairo_svg_versions; + + if (num_versions != NULL) + *num_versions = CAIRO_SVG_VERSION_LAST; +} + +/** + * cairo_svg_version_to_string: + * @version: a version id + * + * Get the string representation of the given @version id. This function + * will return %NULL if @version isn't valid. See cairo_svg_get_versions() + * for a way to get the list of valid version ids. + * + * Return value: the string associated to given version. + * + * Since: 1.2 + **/ +const char * +cairo_svg_version_to_string (cairo_svg_version_t version) +{ + if (version >= CAIRO_SVG_VERSION_LAST) + return NULL; + + return _cairo_svg_version_strings[version]; +} + +static cairo_bool_t +_cliprect_covers_surface (cairo_svg_surface_t *surface, + cairo_path_fixed_t *path) +{ + cairo_box_t box; + + if (_cairo_path_fixed_is_box (path, &box)) { + if (box.p1.x <= 0 && + box.p1.y <= 0 && + _cairo_fixed_to_double (box.p2.x) >= surface->width && + _cairo_fixed_to_double (box.p2.y) >= surface->height) + { + return TRUE; + } + } + + return FALSE; +} + +static cairo_status_t +_cairo_svg_surface_clipper_intersect_clip_path (cairo_surface_clipper_t *clipper, + cairo_path_fixed_t *path, + cairo_fill_rule_t fill_rule, + double tolerance, + cairo_antialias_t antialias) +{ + cairo_svg_surface_t *surface = cairo_container_of (clipper, + cairo_svg_surface_t, + clipper); + cairo_svg_document_t *document = surface->document; + unsigned int i; + + if (path == NULL) { + for (i = 0; i < surface->clip_level; i++) + _cairo_output_stream_printf (surface->xml_node, "\n"); + + surface->clip_level = 0; + return CAIRO_STATUS_SUCCESS; + } + + /* skip trivial whole-page clips */ + if (_cliprect_covers_surface (surface, path)) + return CAIRO_STATUS_SUCCESS; + + _cairo_output_stream_printf (document->xml_node_defs, + "\n" + " clip_id); + _cairo_svg_surface_emit_path (document->xml_node_defs, path, NULL); + + _cairo_output_stream_printf (document->xml_node_defs, + "/>\n" + "\n"); + + _cairo_output_stream_printf (surface->xml_node, + "\n", + document->clip_id, + fill_rule == CAIRO_FILL_RULE_EVEN_ODD ? + "evenodd" : "nonzero"); + + document->clip_id++; + surface->clip_level++; + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_surface_t * +_cairo_svg_surface_create_for_document (cairo_svg_document_t *document, + cairo_content_t content, + double width, + double height) +{ + cairo_svg_surface_t *surface; + cairo_surface_t *paginated; + cairo_status_t status, status_ignored; + + surface = malloc (sizeof (cairo_svg_surface_t)); + if (unlikely (surface == NULL)) + return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_NO_MEMORY)); + + _cairo_surface_init (&surface->base, + &cairo_svg_surface_backend, + NULL, /* device */ + content); + + surface->width = width; + surface->height = height; + + surface->document = _cairo_svg_document_reference (document); + + surface->clip_level = 0; + _cairo_surface_clipper_init (&surface->clipper, + _cairo_svg_surface_clipper_intersect_clip_path); + + surface->base_clip = document->clip_id++; + surface->is_base_clip_emitted = FALSE; + + surface->xml_node = _cairo_memory_stream_create (); + status = _cairo_output_stream_get_status (surface->xml_node); + if (unlikely (status)) + goto CLEANUP; + + _cairo_array_init (&surface->page_set, sizeof (cairo_svg_page_t)); + + if (content == CAIRO_CONTENT_COLOR) { + _cairo_output_stream_printf (surface->xml_node, + "\n", + width, height); + status = _cairo_output_stream_get_status (surface->xml_node); + if (unlikely (status)) + goto CLEANUP; + } + + surface->paginated_mode = CAIRO_PAGINATED_MODE_ANALYZE; + surface->force_fallbacks = FALSE; + surface->content = content; + + paginated = _cairo_paginated_surface_create (&surface->base, + surface->content, + &cairo_svg_surface_paginated_backend); + status = paginated->status; + if (status == CAIRO_STATUS_SUCCESS) { + /* paginated keeps the only reference to surface now, drop ours */ + cairo_surface_destroy (&surface->base); + return paginated; + } + + /* ignore status as we are on the error path */ +CLEANUP: + status_ignored = _cairo_output_stream_destroy (surface->xml_node); + status_ignored = _cairo_svg_document_destroy (document); + + free (surface); + + return _cairo_surface_create_in_error (status); +} + +static cairo_surface_t * +_cairo_svg_surface_create_for_stream_internal (cairo_output_stream_t *stream, + double width, + double height, + cairo_svg_version_t version) +{ + cairo_svg_document_t *document = NULL; /* silence compiler */ + cairo_surface_t *surface; + cairo_status_t status; + + status = _cairo_svg_document_create (stream, + width, height, version, + &document); + if (unlikely (status)) { + surface = _cairo_surface_create_in_error (status); + /* consume the output stream on behalf of caller */ + status = _cairo_output_stream_destroy (stream); + return surface; + } + + surface = _cairo_svg_surface_create_for_document (document, CAIRO_CONTENT_COLOR_ALPHA, + width, height); + if (surface->status) { + status = _cairo_svg_document_destroy (document); + return surface; + } + + document->owner = surface; + status = _cairo_svg_document_destroy (document); + /* the ref count should be 2 at this point */ + assert (status == CAIRO_STATUS_SUCCESS); + + return surface; +} + +static cairo_svg_page_t * +_cairo_svg_surface_store_page (cairo_svg_surface_t *surface) +{ + unsigned int i; + cairo_svg_page_t page; + cairo_output_stream_t *stream; + cairo_status_t status; + + stream = _cairo_memory_stream_create (); + if (_cairo_output_stream_get_status (stream)) { + status = _cairo_output_stream_destroy (stream); + return NULL; + } + + page.surface_id = surface->base.unique_id; + page.clip_level = surface->clip_level; + page.xml_node = surface->xml_node; + + if (_cairo_array_append (&surface->page_set, &page)) { + status = _cairo_output_stream_destroy (stream); + return NULL; + } + + surface->xml_node = stream; + surface->clip_level = 0; + for (i = 0; i < page.clip_level; i++) + _cairo_output_stream_printf (page.xml_node, "\n"); + + _cairo_surface_clipper_reset (&surface->clipper); + + return _cairo_array_index (&surface->page_set, + surface->page_set.num_elements - 1); +} + +static cairo_int_status_t +_cairo_svg_surface_copy_page (void *abstract_surface) +{ + cairo_svg_surface_t *surface = abstract_surface; + cairo_svg_page_t *page; + + page = _cairo_svg_surface_store_page (surface); + if (unlikely (page == NULL)) + return _cairo_error (CAIRO_STATUS_NO_MEMORY); + + _cairo_memory_stream_copy (page->xml_node, surface->xml_node); + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_int_status_t +_cairo_svg_surface_show_page (void *abstract_surface) +{ + cairo_svg_surface_t *surface = abstract_surface; + + if (unlikely (_cairo_svg_surface_store_page (surface) == NULL)) + return _cairo_error (CAIRO_STATUS_NO_MEMORY); + + return CAIRO_STATUS_SUCCESS; +} + +static void +_cairo_svg_surface_emit_transform (cairo_output_stream_t *output, + char const *attribute_str, + const cairo_matrix_t *object_matrix, + const cairo_matrix_t *parent_matrix) +{ + cairo_matrix_t matrix = *object_matrix; + + if (parent_matrix != NULL) + cairo_matrix_multiply (&matrix, &matrix, parent_matrix); + + if (!_cairo_matrix_is_identity (&matrix)) + _cairo_output_stream_printf (output, + "%s=\"matrix(%f,%f,%f,%f,%f,%f)\"", + attribute_str, + matrix.xx, matrix.yx, + matrix.xy, matrix.yy, + matrix.x0, matrix.y0); +} + +typedef struct { + cairo_output_stream_t *output; + const cairo_matrix_t *ctm_inverse; +} svg_path_info_t; + +static cairo_status_t +_cairo_svg_path_move_to (void *closure, + const cairo_point_t *point) +{ + svg_path_info_t *info = closure; + double x = _cairo_fixed_to_double (point->x); + double y = _cairo_fixed_to_double (point->y); + + if (info->ctm_inverse) + cairo_matrix_transform_point (info->ctm_inverse, &x, &y); + + _cairo_output_stream_printf (info->output, "M %f %f ", x, y); + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_status_t +_cairo_svg_path_line_to (void *closure, + const cairo_point_t *point) +{ + svg_path_info_t *info = closure; + double x = _cairo_fixed_to_double (point->x); + double y = _cairo_fixed_to_double (point->y); + + if (info->ctm_inverse) + cairo_matrix_transform_point (info->ctm_inverse, &x, &y); + + _cairo_output_stream_printf (info->output, "L %f %f ", x, y); + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_status_t +_cairo_svg_path_curve_to (void *closure, + const cairo_point_t *b, + const cairo_point_t *c, + const cairo_point_t *d) +{ + svg_path_info_t *info = closure; + double bx = _cairo_fixed_to_double (b->x); + double by = _cairo_fixed_to_double (b->y); + double cx = _cairo_fixed_to_double (c->x); + double cy = _cairo_fixed_to_double (c->y); + double dx = _cairo_fixed_to_double (d->x); + double dy = _cairo_fixed_to_double (d->y); + + if (info->ctm_inverse) { + cairo_matrix_transform_point (info->ctm_inverse, &bx, &by); + cairo_matrix_transform_point (info->ctm_inverse, &cx, &cy); + cairo_matrix_transform_point (info->ctm_inverse, &dx, &dy); + } + + _cairo_output_stream_printf (info->output, + "C %f %f %f %f %f %f ", + bx, by, cx, cy, dx, dy); + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_status_t +_cairo_svg_path_close_path (void *closure) +{ + svg_path_info_t *info = closure; + + _cairo_output_stream_printf (info->output, "Z "); + + return CAIRO_STATUS_SUCCESS; +} + +static void +_cairo_svg_surface_emit_path (cairo_output_stream_t *output, + cairo_path_fixed_t *path, + const cairo_matrix_t *ctm_inverse) +{ + cairo_status_t status; + svg_path_info_t info; + + _cairo_output_stream_printf (output, "d=\""); + + info.output = output; + info.ctm_inverse = ctm_inverse; + status = _cairo_path_fixed_interpret (path, + CAIRO_DIRECTION_FORWARD, + _cairo_svg_path_move_to, + _cairo_svg_path_line_to, + _cairo_svg_path_curve_to, + _cairo_svg_path_close_path, + &info); + assert (status == CAIRO_STATUS_SUCCESS); + + _cairo_output_stream_printf (output, "\""); +} + +static cairo_int_status_t +_cairo_svg_document_emit_outline_glyph_data (cairo_svg_document_t *document, + cairo_scaled_font_t *scaled_font, + unsigned long glyph_index) +{ + cairo_scaled_glyph_t *scaled_glyph; + cairo_int_status_t status; + + status = _cairo_scaled_glyph_lookup (scaled_font, + glyph_index, + CAIRO_SCALED_GLYPH_INFO_METRICS| + CAIRO_SCALED_GLYPH_INFO_PATH, + &scaled_glyph); + if (unlikely (status)) + return status; + + _cairo_output_stream_printf (document->xml_node_glyphs, + "xml_node_glyphs, + scaled_glyph->path, NULL); + + _cairo_output_stream_printf (document->xml_node_glyphs, + "/>\n"); + + return status; +} + +static cairo_int_status_t +_cairo_svg_document_emit_bitmap_glyph_data (cairo_svg_document_t *document, + cairo_scaled_font_t *scaled_font, + unsigned long glyph_index) +{ + cairo_scaled_glyph_t *scaled_glyph; + cairo_image_surface_t *image; + cairo_status_t status; + uint8_t *row, *byte; + int rows, cols; + int x, y, bit; + + status = _cairo_scaled_glyph_lookup (scaled_font, + glyph_index, + CAIRO_SCALED_GLYPH_INFO_METRICS | + CAIRO_SCALED_GLYPH_INFO_SURFACE, + &scaled_glyph); + if (unlikely (status)) + return status; + + image = _cairo_image_surface_coerce_to_format (scaled_glyph->surface, + CAIRO_FORMAT_A1); + status = image->base.status; + if (unlikely (status)) + return status; + + _cairo_output_stream_printf (document->xml_node_glyphs, "xml_node_glyphs, " transform", + &image->base.device_transform_inverse, NULL); + _cairo_output_stream_printf (document->xml_node_glyphs, ">/n"); + + for (y = 0, row = image->data, rows = image->height; rows; row += image->stride, rows--, y++) { + for (x = 0, byte = row, cols = (image->width + 7) / 8; cols; byte++, cols--) { + uint8_t output_byte = CAIRO_BITSWAP8_IF_LITTLE_ENDIAN (*byte); + for (bit = 7; bit >= 0 && x < image->width; bit--, x++) { + if (output_byte & (1 << bit)) { + _cairo_output_stream_printf (document->xml_node_glyphs, + "\n", + x, y); + } + } + } + } + _cairo_output_stream_printf (document->xml_node_glyphs, "\n"); + + cairo_surface_destroy (&image->base); + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_status_t +_cairo_svg_document_emit_glyph (cairo_svg_document_t *document, + cairo_scaled_font_t *scaled_font, + unsigned long scaled_font_glyph_index, + unsigned int font_id, + unsigned int subset_glyph_index) +{ + cairo_status_t status; + + _cairo_output_stream_printf (document->xml_node_glyphs, + "\n", + font_id, + subset_glyph_index); + + status = _cairo_svg_document_emit_outline_glyph_data (document, + scaled_font, + scaled_font_glyph_index); + if (status == CAIRO_INT_STATUS_UNSUPPORTED) + status = _cairo_svg_document_emit_bitmap_glyph_data (document, + scaled_font, + scaled_font_glyph_index); + if (unlikely (status)) + return status; + + _cairo_output_stream_printf (document->xml_node_glyphs, "\n"); + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_status_t +_cairo_svg_document_emit_font_subset (cairo_scaled_font_subset_t *font_subset, + void *closure) +{ + cairo_svg_document_t *document = closure; + unsigned int i; + cairo_status_t status = CAIRO_STATUS_SUCCESS; + + _cairo_scaled_font_freeze_cache (font_subset->scaled_font); + for (i = 0; i < font_subset->num_glyphs; i++) { + status = _cairo_svg_document_emit_glyph (document, + font_subset->scaled_font, + font_subset->glyphs[i], + font_subset->font_id, i); + if (unlikely (status)) + break; + } + _cairo_scaled_font_thaw_cache (font_subset->scaled_font); + + return status; +} + +static cairo_status_t +_cairo_svg_document_emit_font_subsets (cairo_svg_document_t *document) +{ + cairo_status_t status; + + status = _cairo_scaled_font_subsets_foreach_scaled (document->font_subsets, + _cairo_svg_document_emit_font_subset, + document); + if (unlikely (status)) + goto FAIL; + + status = _cairo_scaled_font_subsets_foreach_user (document->font_subsets, + _cairo_svg_document_emit_font_subset, + document); + + FAIL: + _cairo_scaled_font_subsets_destroy (document->font_subsets); + document->font_subsets = NULL; + + return status; +} + +static char const * +_cairo_svg_surface_operators[] = { + "clear", + + "src", "src-over", "src-in", + "src-out", "src-atop", + + "dst", "dst-over", "dst-in", + "dst-out", "dst-atop", + + "xor", "plus", + "color-dodge", /* FIXME: saturate ? */ + + "multiply", "screen", "overlay", + "darken", "lighten", + "color-dodge", "color-burn", + "hard-light", "soft-light", + "difference", "exclusion" +}; + +static cairo_bool_t +_cairo_svg_surface_analyze_operator (cairo_svg_surface_t *surface, + cairo_operator_t op) +{ + /* guard against newly added operators */ + if (op >= ARRAY_LENGTH (_cairo_svg_surface_operators)) + return CAIRO_INT_STATUS_UNSUPPORTED; + + /* allow operators being NULL if they are unsupported */ + if (_cairo_svg_surface_operators[op] == NULL) + return CAIRO_INT_STATUS_UNSUPPORTED; + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_int_status_t +_cairo_svg_surface_analyze_operation (cairo_svg_surface_t *surface, + cairo_operator_t op, + const cairo_pattern_t *pattern) +{ + cairo_svg_document_t *document = surface->document; + + if (surface->force_fallbacks && + surface->paginated_mode == CAIRO_PAGINATED_MODE_ANALYZE) + { + return CAIRO_INT_STATUS_UNSUPPORTED; + } + + /* SVG doesn't support extend reflect for image pattern */ + if (pattern->type == CAIRO_PATTERN_TYPE_SURFACE && + pattern->extend == CAIRO_EXTEND_REFLECT) + return CAIRO_INT_STATUS_UNSUPPORTED; + + if (document->svg_version >= CAIRO_SVG_VERSION_1_2) + return _cairo_svg_surface_analyze_operator (surface, op); + + if (op == CAIRO_OPERATOR_OVER) + return CAIRO_STATUS_SUCCESS; + + /* The SOURCE operator is only supported if there is nothing + * painted underneath. */ + if (op == CAIRO_OPERATOR_SOURCE) + return CAIRO_INT_STATUS_FLATTEN_TRANSPARENCY; + + return CAIRO_INT_STATUS_UNSUPPORTED; +} + +static cairo_int_status_t +_cairo_svg_surface_operation_supported (cairo_svg_surface_t *surface, + cairo_operator_t op, + const cairo_pattern_t *pattern) +{ + return _cairo_svg_surface_analyze_operation (surface, op, pattern) != CAIRO_INT_STATUS_UNSUPPORTED; +} + +static cairo_status_t +_cairo_svg_surface_finish (void *abstract_surface) +{ + cairo_status_t status, status2; + cairo_svg_surface_t *surface = abstract_surface; + cairo_svg_document_t *document = surface->document; + cairo_svg_page_t *page; + unsigned int i; + + if (_cairo_paginated_surface_get_target (document->owner) == &surface->base) + status = _cairo_svg_document_finish (document); + else + status = CAIRO_STATUS_SUCCESS; + + if (surface->xml_node != NULL) { + status2 = _cairo_output_stream_destroy (surface->xml_node); + if (status == CAIRO_STATUS_SUCCESS) + status = status2; + } + + for (i = 0; i < surface->page_set.num_elements; i++) { + page = _cairo_array_index (&surface->page_set, i); + status2 = _cairo_output_stream_destroy (page->xml_node); + if (status == CAIRO_STATUS_SUCCESS) + status = status2; + } + _cairo_array_fini (&surface->page_set); + + _cairo_surface_clipper_reset (&surface->clipper); + + status2 = _cairo_svg_document_destroy (document); + if (status == CAIRO_STATUS_SUCCESS) + status = status2; + + return status; +} + + +static void +_cairo_svg_surface_emit_alpha_filter (cairo_svg_document_t *document) +{ + if (document->alpha_filter) + return; + + _cairo_output_stream_printf (document->xml_node_defs, + "\n" + " \n" + "\n"); + + document->alpha_filter = TRUE; +} + +typedef struct { + cairo_output_stream_t *output; + unsigned int in_mem; + unsigned int trailing; + unsigned char src[3]; +} base64_write_closure_t; + +static char const base64_table[64] = +"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; + +static cairo_status_t +base64_write_func (void *closure, + const unsigned char *data, + unsigned int length) +{ + base64_write_closure_t *info = (base64_write_closure_t *) closure; + unsigned int i; + unsigned char *src; + + src = info->src; + + if (info->in_mem + length < 3) { + for (i = 0; i < length; i++) { + src[i + info->in_mem] = *data++; + } + info->in_mem += length; + return CAIRO_STATUS_SUCCESS; + } + + do { + unsigned char dst[4]; + + for (i = info->in_mem; i < 3; i++) { + src[i] = *data++; + length--; + } + info->in_mem = 0; + + dst[0] = base64_table[src[0] >> 2]; + dst[1] = base64_table[(src[0] & 0x03) << 4 | src[1] >> 4]; + dst[2] = base64_table[(src[1] & 0x0f) << 2 | src[2] >> 6]; + dst[3] = base64_table[src[2] & 0xfc >> 2]; + /* Special case for the last missing bits */ + switch (info->trailing) { + case 2: + dst[2] = '='; + case 1: + dst[3] = '='; + default: + break; + } + _cairo_output_stream_write (info->output, dst, 4); + } while (length >= 3); + + for (i = 0; i < length; i++) { + src[i] = *data++; + } + info->in_mem = length; + + return _cairo_output_stream_get_status (info->output); +} + +static cairo_int_status_t +_cairo_surface_base64_encode_jpeg (cairo_surface_t *surface, + cairo_output_stream_t *output) +{ + const unsigned char *mime_data; + unsigned long mime_data_length; + cairo_image_info_t image_info; + base64_write_closure_t info; + cairo_status_t status; + + cairo_surface_get_mime_data (surface, CAIRO_MIME_TYPE_JPEG, + &mime_data, &mime_data_length); + if (mime_data == NULL) + return CAIRO_INT_STATUS_UNSUPPORTED; + + status = _cairo_image_info_get_jpeg_info (&image_info, mime_data, mime_data_length); + if (unlikely (status)) + return status; + + _cairo_output_stream_printf (output, "data:image/jpeg;base64,"); + + info.output = output; + info.in_mem = 0; + info.trailing = 0; + + status = base64_write_func (&info, mime_data, mime_data_length); + if (unlikely (status)) + return status; + + if (info.in_mem > 0) { + memset (info.src + info.in_mem, 0, 3 - info.in_mem); + info.trailing = 3 - info.in_mem; + info.in_mem = 3; + status = base64_write_func (&info, NULL, 0); + } + + return status; +} + +static cairo_int_status_t +_cairo_surface_base64_encode_png (cairo_surface_t *surface, + cairo_output_stream_t *output) +{ + const unsigned char *mime_data; + unsigned long mime_data_length; + base64_write_closure_t info; + cairo_status_t status; + + cairo_surface_get_mime_data (surface, CAIRO_MIME_TYPE_PNG, + &mime_data, &mime_data_length); + if (unlikely (surface->status)) + return surface->status; + if (mime_data == NULL) + return CAIRO_INT_STATUS_UNSUPPORTED; + + _cairo_output_stream_printf (output, "data:image/png;base64,"); + + info.output = output; + info.in_mem = 0; + info.trailing = 0; + + status = base64_write_func (&info, mime_data, mime_data_length); + if (unlikely (status)) + return status; + + if (info.in_mem > 0) { + memset (info.src + info.in_mem, 0, 3 - info.in_mem); + info.trailing = 3 - info.in_mem; + info.in_mem = 3; + status = base64_write_func (&info, NULL, 0); + } + + return status; +} + +static cairo_int_status_t +_cairo_surface_base64_encode (cairo_surface_t *surface, + cairo_output_stream_t *output) +{ + cairo_status_t status; + base64_write_closure_t info; + + status = _cairo_surface_base64_encode_jpeg (surface, output); + if (status != CAIRO_INT_STATUS_UNSUPPORTED) + return status; + + status = _cairo_surface_base64_encode_png (surface, output); + if (status != CAIRO_INT_STATUS_UNSUPPORTED) + return status; + + info.output = output; + info.in_mem = 0; + info.trailing = 0; + + _cairo_output_stream_printf (info.output, "data:image/png;base64,"); + + status = cairo_surface_write_to_png_stream (surface, base64_write_func, + (void *) &info); + + if (unlikely (status)) + return status; + + if (info.in_mem > 0) { + memset (info.src + info.in_mem, 0, 3 - info.in_mem); + info.trailing = 3 - info.in_mem; + info.in_mem = 3; + status = base64_write_func (&info, NULL, 0); + } + + return status; +} + +static void +_cairo_svg_surface_emit_operator (cairo_output_stream_t *output, + cairo_svg_surface_t *surface, + cairo_operator_t op) +{ + if (surface->document->svg_version >= CAIRO_SVG_VERSION_1_2 && + op != CAIRO_OPERATOR_OVER) { + _cairo_output_stream_printf (output, " comp-op=\"%s\"", _cairo_svg_surface_operators[op]); + if (!_cairo_operator_bounded_by_source (op)) + _cairo_output_stream_printf (output, " clip-to-self=\"true\""); + } +} + +static void +_cairo_svg_surface_emit_operator_for_style (cairo_output_stream_t *output, + cairo_svg_surface_t *surface, + cairo_operator_t op) +{ + if (surface->document->svg_version >= CAIRO_SVG_VERSION_1_2 && + op != CAIRO_OPERATOR_OVER) { + _cairo_output_stream_printf (output, "comp-op:%s;", _cairo_svg_surface_operators[op]); + if (!_cairo_operator_bounded_by_source (op)) + _cairo_output_stream_printf (output, "clip-to-self:true;"); + } +} + +/** + * _cairo_svg_surface_emit_attr_value: + * + * Write the value to output the stream as a sequence of characters, + * while escaping those which have special meaning in the XML + * attribute's value context: & and ". + **/ +static void +_cairo_svg_surface_emit_attr_value (cairo_output_stream_t *stream, + const unsigned char *value, + unsigned int length) +{ + const unsigned char *p; + const unsigned char *q; + unsigned int i; + + /* we'll accumulate non-special chars in [q, p) range */ + p = value; + q = p; + for (i = 0; i < length; i++, p++) { + if (*p == '&' || *p == '"') { + /* flush what's left before special char */ + if (p != q) { + _cairo_output_stream_write (stream, q, p - q); + q = p + 1; + } + + if (*p == '&') + _cairo_output_stream_printf (stream, "&"); + else // p == '"' + _cairo_output_stream_printf (stream, """); + } + } + + /* flush the trailing chars if any */ + if (p != q) + _cairo_output_stream_write (stream, q, p - q); +} + +static cairo_status_t +_cairo_svg_surface_emit_surface (cairo_svg_document_t *document, + cairo_surface_t *surface) +{ + cairo_rectangle_int_t extents; + cairo_bool_t is_bounded; + cairo_status_t status; + const unsigned char *uri; + unsigned long uri_len; + + if (_cairo_user_data_array_get_data (&surface->user_data, + (cairo_user_data_key_t *) document)) + { + return CAIRO_STATUS_SUCCESS; + } + + is_bounded = _cairo_surface_get_extents (surface, &extents); + assert (is_bounded); + + _cairo_output_stream_printf (document->xml_node_defs, + "unique_id, + extents.width, extents.height); + + _cairo_output_stream_printf (document->xml_node_defs, " xlink:href=\""); + + cairo_surface_get_mime_data (surface, CAIRO_MIME_TYPE_URI, + &uri, &uri_len); + if (uri != NULL) { + _cairo_svg_surface_emit_attr_value (document->xml_node_defs, + uri, uri_len); + } else { + status = _cairo_surface_base64_encode (surface, + document->xml_node_defs); + if (unlikely (status)) + return status; + } + + _cairo_output_stream_printf (document->xml_node_defs, "\"/>\n"); + + /* and tag it */ + return _cairo_user_data_array_set_data (&surface->user_data, + (cairo_user_data_key_t *) document, + document, NULL); +} + +static cairo_status_t +_cairo_svg_surface_emit_composite_surface_pattern (cairo_output_stream_t *output, + cairo_svg_surface_t *svg_surface, + cairo_operator_t op, + cairo_surface_pattern_t *pattern, + int pattern_id, + const cairo_matrix_t *parent_matrix, + const char *extra_attributes) +{ + cairo_status_t status; + cairo_matrix_t p2u; + + p2u = pattern->base.matrix; + status = cairo_matrix_invert (&p2u); + /* cairo_pattern_set_matrix ensures the matrix is invertible */ + assert (status == CAIRO_STATUS_SUCCESS); + + status = _cairo_svg_surface_emit_surface (svg_surface->document, + pattern->surface); + if (unlikely (status)) + return status; + + if (pattern_id != invalid_pattern_id) { + cairo_rectangle_int_t extents; + cairo_bool_t is_bounded; + + is_bounded = _cairo_surface_get_extents (pattern->surface, &extents); + assert (is_bounded); + + _cairo_output_stream_printf (output, + "\n "); + } + + _cairo_output_stream_printf (output, + "surface->unique_id); + if (extra_attributes) + _cairo_output_stream_printf (output, " %s", extra_attributes); + + if (pattern_id == invalid_pattern_id) { + _cairo_svg_surface_emit_operator (output, svg_surface, op); + _cairo_svg_surface_emit_transform (output, + " transform", + &p2u, parent_matrix); + } + _cairo_output_stream_printf (output, "/>\n"); + + + if (pattern_id != invalid_pattern_id) + _cairo_output_stream_printf (output, "\n"); + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_status_t +_cairo_svg_surface_emit_recording_surface (cairo_svg_document_t *document, + cairo_recording_surface_t *source) +{ + cairo_status_t status; + cairo_surface_t *paginated_surface; + cairo_svg_surface_t *svg_surface; + cairo_array_t *page_set; + + cairo_output_stream_t *contents; + + if (_cairo_user_data_array_get_data (&source->base.user_data, + (cairo_user_data_key_t *) document)) + { + return CAIRO_STATUS_SUCCESS; + } + + paginated_surface = _cairo_svg_surface_create_for_document (document, + source->content, + source->extents_pixels.width, + source->extents_pixels.height); + if (unlikely (paginated_surface->status)) + return paginated_surface->status; + + svg_surface = (cairo_svg_surface_t *) + _cairo_paginated_surface_get_target (paginated_surface); + cairo_surface_set_fallback_resolution (paginated_surface, + document->owner->x_fallback_resolution, + document->owner->y_fallback_resolution); + cairo_surface_set_device_offset (&svg_surface->base, + -source->extents_pixels.x, + -source->extents_pixels.y); + + status = _cairo_recording_surface_replay (&source->base, paginated_surface); + if (unlikely (status)) { + cairo_surface_destroy (paginated_surface); + return status; + } + + cairo_surface_show_page (paginated_surface); + status = cairo_surface_status (paginated_surface); + if (unlikely (status)) { + cairo_surface_destroy (paginated_surface); + return status; + } + + if (! svg_surface->is_base_clip_emitted) { + svg_surface->is_base_clip_emitted = TRUE; + _cairo_output_stream_printf (document->xml_node_defs, + "\n" + " \n" + "\n", + svg_surface->base_clip, + svg_surface->width, + svg_surface->height); + } + + if (source->content == CAIRO_CONTENT_ALPHA) { + _cairo_svg_surface_emit_alpha_filter (document); + _cairo_output_stream_printf (document->xml_node_defs, + "\n", + source->base.unique_id, + svg_surface->base_clip); + } else { + _cairo_output_stream_printf (document->xml_node_defs, + "\n", + source->base.unique_id, + svg_surface->base_clip); + } + + contents = svg_surface->xml_node; + page_set = &svg_surface->page_set; + + if (_cairo_memory_stream_length (contents) > 0) { + if (unlikely (_cairo_svg_surface_store_page (svg_surface) == NULL)) { + cairo_surface_destroy (paginated_surface); + return _cairo_error (CAIRO_STATUS_NO_MEMORY); + } + } + + if (page_set->num_elements > 0) { + cairo_svg_page_t *page; + + page = _cairo_array_index (page_set, page_set->num_elements - 1); + _cairo_memory_stream_copy (page->xml_node, document->xml_node_defs); + } + + _cairo_output_stream_printf (document->xml_node_defs, "\n"); + + status = cairo_surface_status (paginated_surface); + cairo_surface_destroy (paginated_surface); + + if (unlikely (status)) + return status; + + /* and tag it */ + return _cairo_user_data_array_set_data (&source->base.user_data, + (cairo_user_data_key_t *) document, + document, NULL); +} + +static cairo_status_t +_cairo_svg_surface_emit_composite_recording_pattern (cairo_output_stream_t *output, + cairo_svg_surface_t *surface, + cairo_operator_t op, + cairo_surface_pattern_t *pattern, + int pattern_id, + const cairo_matrix_t *parent_matrix, + const char *extra_attributes) +{ + cairo_svg_document_t *document = surface->document; + cairo_recording_surface_t *recording_surface; + cairo_matrix_t p2u; + cairo_status_t status; + + p2u = pattern->base.matrix; + status = cairo_matrix_invert (&p2u); + /* cairo_pattern_set_matrix ensures the matrix is invertible */ + assert (status == CAIRO_STATUS_SUCCESS); + + recording_surface = (cairo_recording_surface_t *) pattern->surface; + status = _cairo_svg_surface_emit_recording_surface (document, recording_surface); + if (unlikely (status)) + return status; + + if (pattern_id != invalid_pattern_id) { + _cairo_output_stream_printf (output, + "extents.width, + recording_surface->extents.height); + _cairo_svg_surface_emit_transform (output, " patternTransform", &p2u, parent_matrix); + _cairo_output_stream_printf (output, ">\n"); + } + + _cairo_output_stream_printf (output, + "base.unique_id); + + if (pattern_id == invalid_pattern_id) { + _cairo_svg_surface_emit_operator (output, surface, op); + _cairo_svg_surface_emit_transform (output, " transform", &p2u, parent_matrix); + } + + if (extra_attributes) + _cairo_output_stream_printf (output, " %s", extra_attributes); + + _cairo_output_stream_printf (output, "/>\n"); + + if (pattern_id != invalid_pattern_id) + _cairo_output_stream_printf (output, "\n"); + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_status_t +_cairo_svg_surface_emit_composite_pattern (cairo_output_stream_t *output, + cairo_svg_surface_t *surface, + cairo_operator_t op, + cairo_surface_pattern_t *pattern, + int pattern_id, + const cairo_matrix_t *parent_matrix, + const char *extra_attributes) +{ + + if (_cairo_surface_is_recording (pattern->surface)) { + return _cairo_svg_surface_emit_composite_recording_pattern (output, surface, + op, pattern, + pattern_id, + parent_matrix, + extra_attributes); + } + + return _cairo_svg_surface_emit_composite_surface_pattern (output, surface, + op, pattern, + pattern_id, + parent_matrix, + extra_attributes); +} + +static cairo_status_t +_cairo_svg_surface_emit_solid_pattern (cairo_svg_surface_t *surface, + cairo_solid_pattern_t *pattern, + cairo_output_stream_t *style, + cairo_bool_t is_stroke) +{ + _cairo_output_stream_printf (style, is_stroke ? + "stroke:rgb(%f%%,%f%%,%f%%);stroke-opacity:%f;": + "fill:rgb(%f%%,%f%%,%f%%);fill-opacity:%f;", + pattern->color.red * 100.0, + pattern->color.green * 100.0, + pattern->color.blue * 100.0, + pattern->color.alpha); + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_status_t +_cairo_svg_surface_emit_surface_pattern (cairo_svg_surface_t *surface, + cairo_surface_pattern_t *pattern, + cairo_output_stream_t *style, + cairo_bool_t is_stroke, + const cairo_matrix_t *parent_matrix) +{ + cairo_svg_document_t *document = surface->document; + cairo_status_t status; + int pattern_id; + + pattern_id = document->pattern_id++; + status = _cairo_svg_surface_emit_composite_pattern (document->xml_node_defs, + surface, CAIRO_OPERATOR_SOURCE, pattern, + pattern_id, parent_matrix, NULL); + if (unlikely (status)) + return status; + + _cairo_output_stream_printf (style, + "%s:url(#pattern%d);", + is_stroke ? "stroke" : "fill", + pattern_id); + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_status_t +_cairo_svg_surface_emit_pattern_stops (cairo_output_stream_t *output, + cairo_gradient_pattern_t const *pattern, + double start_offset, + cairo_bool_t reverse_stops, + cairo_bool_t emulate_reflect) +{ + cairo_gradient_stop_t *stops; + double offset; + unsigned int n_stops; + unsigned int i; + + if (pattern->n_stops < 1) + return CAIRO_STATUS_SUCCESS; + + if (pattern->n_stops == 1) { + _cairo_output_stream_printf (output, + "\n", + pattern->stops[0].offset, + pattern->stops[0].color.red * 100.0, + pattern->stops[0].color.green * 100.0, + pattern->stops[0].color.blue * 100.0, + pattern->stops[0].color.alpha); + return CAIRO_STATUS_SUCCESS; + } + + if (emulate_reflect || reverse_stops) { + n_stops = emulate_reflect ? pattern->n_stops * 2 - 2: pattern->n_stops; + stops = _cairo_malloc_ab (n_stops, sizeof (cairo_gradient_stop_t)); + if (unlikely (stops == NULL)) + return _cairo_error (CAIRO_STATUS_NO_MEMORY); + + for (i = 0; i < pattern->n_stops; i++) { + if (reverse_stops) { + stops[i] = pattern->stops[pattern->n_stops - i - 1]; + stops[i].offset = 1.0 - stops[i].offset; + } else + stops[i] = pattern->stops[i]; + if (emulate_reflect) { + stops[i].offset /= 2; + if (i > 0 && i < (pattern->n_stops - 1)) { + if (reverse_stops) { + stops[i + pattern->n_stops - 1] = pattern->stops[i]; + stops[i + pattern->n_stops - 1].offset = + 0.5 + 0.5 * stops[i + pattern->n_stops - 1].offset; + } else { + stops[i + pattern->n_stops - 1] = pattern->stops[pattern->n_stops - i - 1]; + stops[i + pattern->n_stops - 1].offset = + 1 - 0.5 * stops[i + pattern->n_stops - 1].offset; + } + } + } + } + } else { + n_stops = pattern->n_stops; + stops = pattern->stops; + } + + if (start_offset >= 0.0) + for (i = 0; i < n_stops; i++) { + offset = start_offset + (1 - start_offset ) * stops[i].offset; + _cairo_output_stream_printf (output, + "\n", + offset, + stops[i].color.red * 100.0, + stops[i].color.green * 100.0, + stops[i].color.blue * 100.0, + stops[i].color.alpha); + } + else { + cairo_bool_t found = FALSE; + unsigned int offset_index; + cairo_color_stop_t offset_color_start, offset_color_stop; + + for (i = 0; i < n_stops; i++) { + if (stops[i].offset >= -start_offset) { + if (i > 0) { + if (stops[i].offset != stops[i-1].offset) { + double x0, x1; + cairo_color_stop_t *color0, *color1; + + x0 = stops[i-1].offset; + x1 = stops[i].offset; + color0 = &stops[i-1].color; + color1 = &stops[i].color; + offset_color_start.red = color0->red + (color1->red - color0->red) + * (-start_offset - x0) / (x1 - x0); + offset_color_start.green = color0->green + (color1->green - color0->green) + * (-start_offset - x0) / (x1 - x0); + offset_color_start.blue = color0->blue + (color1->blue - color0->blue) + * (-start_offset - x0) / (x1 - x0); + offset_color_start.alpha = color0->alpha + (color1->alpha - color0->alpha) + * (-start_offset - x0) / (x1 - x0); + offset_color_stop = offset_color_start; + } else { + offset_color_stop = stops[i-1].color; + offset_color_start = stops[i].color; + } + } else + offset_color_stop = offset_color_start = stops[i].color; + offset_index = i; + found = TRUE; + break; + } + } + + if (!found) { + offset_index = n_stops - 1; + offset_color_stop = offset_color_start = stops[offset_index].color; + } + + _cairo_output_stream_printf (output, + "\n", + offset_color_start.red * 100.0, + offset_color_start.green * 100.0, + offset_color_start.blue * 100.0, + offset_color_start.alpha); + for (i = offset_index; i < n_stops; i++) { + _cairo_output_stream_printf (output, + "\n", + stops[i].offset + start_offset, + stops[i].color.red * 100.0, + stops[i].color.green * 100.0, + stops[i].color.blue * 100.0, + stops[i].color.alpha); + } + for (i = 0; i < offset_index; i++) { + _cairo_output_stream_printf (output, + "\n", + 1.0 + stops[i].offset + start_offset, + stops[i].color.red * 100.0, + stops[i].color.green * 100.0, + stops[i].color.blue * 100.0, + stops[i].color.alpha); + } + + _cairo_output_stream_printf (output, + "\n", + offset_color_stop.red * 100.0, + offset_color_stop.green * 100.0, + offset_color_stop.blue * 100.0, + offset_color_stop.alpha); + + } + + if (reverse_stops || emulate_reflect) + free (stops); + + return CAIRO_STATUS_SUCCESS; +} + +static void +_cairo_svg_surface_emit_pattern_extend (cairo_output_stream_t *output, + cairo_pattern_t *pattern) +{ + switch (pattern->extend) { + case CAIRO_EXTEND_REPEAT: + _cairo_output_stream_printf (output, "spreadMethod=\"repeat\" "); + break; + case CAIRO_EXTEND_REFLECT: + _cairo_output_stream_printf (output, "spreadMethod=\"reflect\" "); + break; + case CAIRO_EXTEND_NONE: + case CAIRO_EXTEND_PAD: + break; + } +} + +static cairo_status_t +_cairo_svg_surface_emit_linear_pattern (cairo_svg_surface_t *surface, + cairo_linear_pattern_t *pattern, + cairo_output_stream_t *style, + cairo_bool_t is_stroke, + const cairo_matrix_t *parent_matrix) +{ + cairo_svg_document_t *document = surface->document; + double x0, y0, x1, y1; + cairo_matrix_t p2u; + cairo_status_t status; + + p2u = pattern->base.base.matrix; + status = cairo_matrix_invert (&p2u); + /* cairo_pattern_set_matrix ensures the matrix is invertible */ + assert (status == CAIRO_STATUS_SUCCESS); + + x0 = _cairo_fixed_to_double (pattern->p1.x); + y0 = _cairo_fixed_to_double (pattern->p1.y); + x1 = _cairo_fixed_to_double (pattern->p2.x); + y1 = _cairo_fixed_to_double (pattern->p2.y); + + _cairo_output_stream_printf (document->xml_node_defs, + "linear_pattern_id, + x0, y0, x1, y1); + + _cairo_svg_surface_emit_pattern_extend (document->xml_node_defs, &pattern->base.base), + _cairo_svg_surface_emit_transform (document->xml_node_defs, "gradientTransform", &p2u, parent_matrix); + _cairo_output_stream_printf (document->xml_node_defs, ">\n"); + + status = _cairo_svg_surface_emit_pattern_stops (document->xml_node_defs, + &pattern->base, 0.0, + FALSE, FALSE); + if (unlikely (status)) + return status; + + _cairo_output_stream_printf (document->xml_node_defs, + "\n"); + + _cairo_output_stream_printf (style, + "%s:url(#linear%d);", + is_stroke ? "stroke" : "fill", + document->linear_pattern_id); + + document->linear_pattern_id++; + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_status_t +_cairo_svg_surface_emit_radial_pattern (cairo_svg_surface_t *surface, + cairo_radial_pattern_t *pattern, + cairo_output_stream_t *style, + cairo_bool_t is_stroke, + const cairo_matrix_t *parent_matrix) +{ + cairo_svg_document_t *document = surface->document; + cairo_matrix_t p2u; + cairo_extend_t extend; + double x0, y0, x1, y1, r0, r1; + double fx, fy; + cairo_bool_t reverse_stops; + cairo_status_t status; + cairo_point_t *c0, *c1; + cairo_fixed_t radius0, radius1; + + extend = pattern->base.base.extend; + + if (pattern->r1 < pattern->r2) { + c0 = &pattern->c1; + c1 = &pattern->c2; + radius0 = pattern->r1; + radius1 = pattern->r2; + reverse_stops = FALSE; + } else { + c0 = &pattern->c2; + c1 = &pattern->c1; + radius0 = pattern->r2; + radius1 = pattern->r1; + reverse_stops = TRUE; + } + + x0 = _cairo_fixed_to_double (c0->x); + y0 = _cairo_fixed_to_double (c0->y); + r0 = _cairo_fixed_to_double (radius0); + x1 = _cairo_fixed_to_double (c1->x); + y1 = _cairo_fixed_to_double (c1->y); + r1 = _cairo_fixed_to_double (radius1); + + p2u = pattern->base.base.matrix; + status = cairo_matrix_invert (&p2u); + /* cairo_pattern_set_matrix ensures the matrix is invertible */ + assert (status == CAIRO_STATUS_SUCCESS); + + if (pattern->r1 == pattern->r2) { + unsigned int n_stops = pattern->base.n_stops; + + _cairo_output_stream_printf (document->xml_node_defs, + "radial_pattern_id, + x1, y1, + x1, y1, r1); + _cairo_svg_surface_emit_transform (document->xml_node_defs, + "gradientTransform", + &p2u, parent_matrix); + _cairo_output_stream_printf (document->xml_node_defs, ">\n"); + + if (extend == CAIRO_EXTEND_NONE || n_stops < 1) + _cairo_output_stream_printf (document->xml_node_defs, + "\n"); + else { + _cairo_output_stream_printf (document->xml_node_defs, + "\n", + pattern->base.stops[0].color.red * 100.0, + pattern->base.stops[0].color.green * 100.0, + pattern->base.stops[0].color.blue * 100.0, + pattern->base.stops[0].color.alpha); + if (n_stops > 1) + _cairo_output_stream_printf (document->xml_node_defs, + "\n", + pattern->base.stops[n_stops - 1].color.red * 100.0, + pattern->base.stops[n_stops - 1].color.green * 100.0, + pattern->base.stops[n_stops - 1].color.blue * 100.0, + pattern->base.stops[n_stops - 1].color.alpha); + } + + } else { + double offset, r, x, y; + cairo_bool_t emulate_reflect = FALSE; + + fx = (r1 * x0 - r0 * x1) / (r1 - r0); + fy = (r1 * y0 - r0 * y1) / (r1 - r0); + + /* SVG doesn't support the inner circle and use instead a gradient focal. + * That means we need to emulate the cairo behaviour by processing the + * cairo gradient stops. + * The CAIRO_EXTENT_NONE and CAIRO_EXTENT_PAD modes are quite easy to handle, + * it's just a matter of stop position translation and calculation of + * the corresponding SVG radial gradient focal. + * The CAIRO_EXTENT_REFLECT and CAIRO_EXTEND_REPEAT modes require to compute a new + * radial gradient, with an new outer circle, equal to r1 - r0 in the CAIRO_EXTEND_REPEAT + * case, and 2 * (r1 - r0) in the CAIRO_EXTENT_REFLECT case, and a new gradient stop + * list that maps to the original cairo stop list. + */ + if ((extend == CAIRO_EXTEND_REFLECT + || extend == CAIRO_EXTEND_REPEAT) + && r0 > 0.0) { + double r_org = r1; + + if (extend == CAIRO_EXTEND_REFLECT) { + r1 = 2 * r1 - r0; + emulate_reflect = TRUE; + } + + offset = fmod (r1, r1 - r0) / (r1 - r0) - 1.0; + r = r1 - r0; + + /* New position of outer circle. */ + x = r * (x1 - fx) / r_org + fx; + y = r * (y1 - fy) / r_org + fy; + + x1 = x; + y1 = y; + r1 = r; + r0 = 0.0; + } else { + offset = r0 / r1; + } + + _cairo_output_stream_printf (document->xml_node_defs, + "radial_pattern_id, + x1, y1, + fx, fy, r1); + + if (emulate_reflect) + _cairo_output_stream_printf (document->xml_node_defs, "spreadMethod=\"repeat\" "); + else + _cairo_svg_surface_emit_pattern_extend (document->xml_node_defs, &pattern->base.base); + _cairo_svg_surface_emit_transform (document->xml_node_defs, "gradientTransform", &p2u, parent_matrix); + _cairo_output_stream_printf (document->xml_node_defs, ">\n"); + + /* To support cairo's EXTEND_NONE, (for which SVG has no similar + * notion), we add transparent color stops on either end of the + * user-provided stops. */ + if (extend == CAIRO_EXTEND_NONE) { + _cairo_output_stream_printf (document->xml_node_defs, + "\n"); + if (r0 != 0.0) + _cairo_output_stream_printf (document->xml_node_defs, + "\n", + r0 / r1); + } + status = _cairo_svg_surface_emit_pattern_stops (document->xml_node_defs, + &pattern->base, offset, + reverse_stops, + emulate_reflect); + if (unlikely (status)) + return status; + + if (pattern->base.base.extend == CAIRO_EXTEND_NONE) + _cairo_output_stream_printf (document->xml_node_defs, + "\n"); + } + + _cairo_output_stream_printf (document->xml_node_defs, + "\n"); + + _cairo_output_stream_printf (style, + "%s:url(#radial%d);", + is_stroke ? "stroke" : "fill", + document->radial_pattern_id); + + document->radial_pattern_id++; + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_status_t +_cairo_svg_surface_emit_pattern (cairo_svg_surface_t *surface, + const cairo_pattern_t *pattern, + cairo_output_stream_t *output, + cairo_bool_t is_stroke, + const cairo_matrix_t *parent_matrix) +{ + switch (pattern->type) { + case CAIRO_PATTERN_TYPE_SOLID: + return _cairo_svg_surface_emit_solid_pattern (surface, (cairo_solid_pattern_t *) pattern, + output, is_stroke); + + case CAIRO_PATTERN_TYPE_SURFACE: + return _cairo_svg_surface_emit_surface_pattern (surface, (cairo_surface_pattern_t *) pattern, + output, is_stroke, parent_matrix); + + case CAIRO_PATTERN_TYPE_LINEAR: + return _cairo_svg_surface_emit_linear_pattern (surface, (cairo_linear_pattern_t *) pattern, + output, is_stroke, parent_matrix); + + case CAIRO_PATTERN_TYPE_RADIAL: + return _cairo_svg_surface_emit_radial_pattern (surface, (cairo_radial_pattern_t *) pattern, + output, is_stroke, parent_matrix); + } + return _cairo_error (CAIRO_STATUS_PATTERN_TYPE_MISMATCH); +} + +static cairo_status_t +_cairo_svg_surface_emit_fill_style (cairo_output_stream_t *output, + cairo_svg_surface_t *surface, + cairo_operator_t op, + const cairo_pattern_t *source, + cairo_fill_rule_t fill_rule, + const cairo_matrix_t *parent_matrix) +{ + _cairo_output_stream_printf (output, + "fill-rule:%s;", + fill_rule == CAIRO_FILL_RULE_EVEN_ODD ? + "evenodd" : "nonzero"); + _cairo_svg_surface_emit_operator_for_style (output, surface, op); + return _cairo_svg_surface_emit_pattern (surface, source, output, FALSE, parent_matrix); +} + +static cairo_status_t +_cairo_svg_surface_emit_stroke_style (cairo_output_stream_t *output, + cairo_svg_surface_t *surface, + cairo_operator_t op, + const cairo_pattern_t *source, + const cairo_stroke_style_t *stroke_style, + const cairo_matrix_t *parent_matrix) +{ + cairo_status_t status; + const char *line_cap, *line_join; + unsigned int i; + + switch (stroke_style->line_cap) { + case CAIRO_LINE_CAP_BUTT: + line_cap = "butt"; + break; + case CAIRO_LINE_CAP_ROUND: + line_cap = "round"; + break; + case CAIRO_LINE_CAP_SQUARE: + line_cap = "square"; + break; + default: + ASSERT_NOT_REACHED; + } + + switch (stroke_style->line_join) { + case CAIRO_LINE_JOIN_MITER: + line_join = "miter"; + break; + case CAIRO_LINE_JOIN_ROUND: + line_join = "round"; + break; + case CAIRO_LINE_JOIN_BEVEL: + line_join = "bevel"; + break; + default: + ASSERT_NOT_REACHED; + } + + _cairo_output_stream_printf (output, + "stroke-width:%f;" + "stroke-linecap:%s;" + "stroke-linejoin:%s;", + stroke_style->line_width, + line_cap, + line_join); + + status = _cairo_svg_surface_emit_pattern (surface, source, output, TRUE, parent_matrix); + if (unlikely (status)) + return status; + + _cairo_svg_surface_emit_operator_for_style (output, surface, op); + + if (stroke_style->num_dashes > 0) { + _cairo_output_stream_printf (output, "stroke-dasharray:"); + for (i = 0; i < stroke_style->num_dashes; i++) { + _cairo_output_stream_printf (output, "%f", + stroke_style->dash[i]); + if (i + 1 < stroke_style->num_dashes) + _cairo_output_stream_printf (output, ","); + else + _cairo_output_stream_printf (output, ";"); + } + if (stroke_style->dash_offset != 0.0) { + _cairo_output_stream_printf (output, + "stroke-dashoffset:%f;", + stroke_style->dash_offset); + } + } + + _cairo_output_stream_printf (output, + "stroke-miterlimit:%f;", + stroke_style->miter_limit); + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_int_status_t +_cairo_svg_surface_fill_stroke (void *abstract_surface, + cairo_operator_t fill_op, + const cairo_pattern_t *fill_source, + cairo_fill_rule_t fill_rule, + double fill_tolerance, + cairo_antialias_t fill_antialias, + cairo_path_fixed_t *path, + cairo_operator_t stroke_op, + const cairo_pattern_t *stroke_source, + const cairo_stroke_style_t *stroke_style, + const cairo_matrix_t *stroke_ctm, + const cairo_matrix_t *stroke_ctm_inverse, + double stroke_tolerance, + cairo_antialias_t stroke_antialias, + cairo_clip_t *clip) +{ + cairo_svg_surface_t *surface = abstract_surface; + cairo_status_t status; + + status = _cairo_surface_clipper_set_clip (&surface->clipper, clip); + if (unlikely (status)) + return status; + + _cairo_output_stream_printf (surface->xml_node, "xml_node, surface, fill_op, + fill_source, fill_rule, stroke_ctm_inverse); + if (unlikely (status)) + return status; + + status = _cairo_svg_surface_emit_stroke_style (surface->xml_node, surface, stroke_op, + stroke_source, stroke_style, stroke_ctm_inverse); + if (unlikely (status)) + return status; + + _cairo_output_stream_printf (surface->xml_node, "\" "); + + _cairo_svg_surface_emit_path (surface->xml_node, path, stroke_ctm_inverse); + + _cairo_svg_surface_emit_transform (surface->xml_node, " transform", stroke_ctm, NULL); + _cairo_output_stream_printf (surface->xml_node, "/>\n"); + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_int_status_t +_cairo_svg_surface_fill (void *abstract_surface, + cairo_operator_t op, + const cairo_pattern_t *source, + cairo_path_fixed_t *path, + cairo_fill_rule_t fill_rule, + double tolerance, + cairo_antialias_t antialias, + cairo_clip_t *clip) +{ + cairo_svg_surface_t *surface = abstract_surface; + cairo_status_t status; + + if (surface->paginated_mode == CAIRO_PAGINATED_MODE_ANALYZE) + return _cairo_svg_surface_analyze_operation (surface, op, source); + + assert (_cairo_svg_surface_operation_supported (surface, op, source)); + + status = _cairo_surface_clipper_set_clip (&surface->clipper, clip); + if (unlikely (status)) + return status; + + _cairo_output_stream_printf (surface->xml_node, "xml_node, surface, op, source, fill_rule, NULL); + if (unlikely (status)) + return status; + + _cairo_output_stream_printf (surface->xml_node, "\" "); + + _cairo_svg_surface_emit_path (surface->xml_node, path, NULL); + + _cairo_output_stream_printf (surface->xml_node, "/>\n"); + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_bool_t +_cairo_svg_surface_get_extents (void *abstract_surface, + cairo_rectangle_int_t *rectangle) +{ + cairo_svg_surface_t *surface = abstract_surface; + + rectangle->x = 0; + rectangle->y = 0; + + /* XXX: The conversion to integers here is pretty bogus, (not to + * mention the arbitrary limitation of width to a short(!). We + * may need to come up with a better interface for get_size. + */ + rectangle->width = ceil (surface->width); + rectangle->height = ceil (surface->height); + + return TRUE; +} + +static cairo_status_t +_cairo_svg_surface_emit_paint (cairo_output_stream_t *output, + cairo_svg_surface_t *surface, + cairo_operator_t op, + const cairo_pattern_t *source, + const cairo_pattern_t *mask_source, + const char *extra_attributes) +{ + cairo_status_t status; + + if (source->type == CAIRO_PATTERN_TYPE_SURFACE && + source->extend == CAIRO_EXTEND_NONE) + return _cairo_svg_surface_emit_composite_pattern (output, + surface, + op, + (cairo_surface_pattern_t *) source, + invalid_pattern_id, + mask_source ? &mask_source->matrix :NULL, + extra_attributes); + + _cairo_output_stream_printf (output, + "width, surface->height); + _cairo_svg_surface_emit_operator_for_style (output, surface, op); + status = _cairo_svg_surface_emit_pattern (surface, source, output, FALSE, NULL); + if (unlikely (status)) + return status; + + _cairo_output_stream_printf (output, "stroke:none;\""); + + if (extra_attributes) + _cairo_output_stream_printf (output, " %s", extra_attributes); + + _cairo_output_stream_printf (output, "/>\n"); + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_int_status_t +_cairo_svg_surface_paint (void *abstract_surface, + cairo_operator_t op, + const cairo_pattern_t *source, + cairo_clip_t *clip) +{ + cairo_status_t status; + cairo_svg_surface_t *surface = abstract_surface; + + /* Emulation of clear and source operators, when no clipping region + * is defined. We just delete existing content of surface root node, + * and exit early if operator is clear. + */ + if ((op == CAIRO_OPERATOR_CLEAR || op == CAIRO_OPERATOR_SOURCE) && + clip == NULL) + { + switch (surface->paginated_mode) { + case CAIRO_PAGINATED_MODE_FALLBACK: + ASSERT_NOT_REACHED; + case CAIRO_PAGINATED_MODE_ANALYZE: + return CAIRO_STATUS_SUCCESS; + + case CAIRO_PAGINATED_MODE_RENDER: + status = _cairo_output_stream_destroy (surface->xml_node); + if (unlikely (status)) { + surface->xml_node = NULL; + return status; + } + + surface->xml_node = _cairo_memory_stream_create (); + if (_cairo_output_stream_get_status (surface->xml_node)) { + status = _cairo_output_stream_destroy (surface->xml_node); + surface->xml_node = NULL; + return status; + } + + if (op == CAIRO_OPERATOR_CLEAR) { + if (surface->content == CAIRO_CONTENT_COLOR) { + _cairo_output_stream_printf (surface->xml_node, + "\n", + surface->width, surface->height); + } + return CAIRO_STATUS_SUCCESS; + } + break; + } + } else { + if (surface->paginated_mode == CAIRO_PAGINATED_MODE_ANALYZE) + return _cairo_svg_surface_analyze_operation (surface, op, source); + + assert (_cairo_svg_surface_operation_supported (surface, op, source)); + } + + status = _cairo_surface_clipper_set_clip (&surface->clipper, clip); + if (unlikely (status)) + return status; + + return _cairo_svg_surface_emit_paint (surface->xml_node, + surface, op, source, 0, NULL); +} + +static cairo_int_status_t +_cairo_svg_surface_mask (void *abstract_surface, + cairo_operator_t op, + const cairo_pattern_t *source, + const cairo_pattern_t *mask, + cairo_clip_t *clip) +{ + cairo_status_t status; + cairo_svg_surface_t *surface = abstract_surface; + cairo_svg_document_t *document = surface->document; + cairo_output_stream_t *mask_stream; + char buffer[64]; + cairo_bool_t discard_filter = FALSE; + unsigned int mask_id; + + if (surface->paginated_mode == CAIRO_PAGINATED_MODE_ANALYZE) { + cairo_status_t source_status, mask_status; + + source_status = _cairo_svg_surface_analyze_operation (surface, op, source); + if (_cairo_status_is_error (source_status)) + return source_status; + + if (mask->has_component_alpha) { + mask_status = CAIRO_INT_STATUS_UNSUPPORTED; + } else { + mask_status = _cairo_svg_surface_analyze_operation (surface, op, mask); + if (_cairo_status_is_error (mask_status)) + return mask_status; + } + + return _cairo_analysis_surface_merge_status (source_status, + mask_status); + } + + assert (_cairo_svg_surface_operation_supported (surface, op, source)); + assert (_cairo_svg_surface_operation_supported (surface, CAIRO_OPERATOR_OVER, mask)); + + status = _cairo_surface_clipper_set_clip (&surface->clipper, clip); + if (unlikely (status)) + return status; + + if (mask->type == CAIRO_PATTERN_TYPE_SURFACE) { + const cairo_surface_pattern_t *surface_pattern = (const cairo_surface_pattern_t*) mask; + cairo_content_t content = cairo_surface_get_content (surface_pattern->surface); + if (content == CAIRO_CONTENT_ALPHA) + discard_filter = TRUE; + } + + if (!discard_filter) + _cairo_svg_surface_emit_alpha_filter (document); + + /* _cairo_svg_surface_emit_paint() will output a pattern definition to + * document->xml_node_defs so we need to write the mask element to + * a temporary stream and then copy that to xml_node_defs. */ + mask_stream = _cairo_memory_stream_create (); + if (_cairo_output_stream_get_status (mask_stream)) + return _cairo_output_stream_destroy (mask_stream); + + mask_id = _cairo_svg_document_allocate_mask_id (document); + + _cairo_output_stream_printf (mask_stream, + "\n" + "%s", + mask_id, + discard_filter ? "" : " \n"); + status = _cairo_svg_surface_emit_paint (mask_stream, surface, CAIRO_OPERATOR_OVER, mask, source, NULL); + if (unlikely (status)) { + cairo_status_t ignore = _cairo_output_stream_destroy (mask_stream); + return status; + (void) ignore; + } + + _cairo_output_stream_printf (mask_stream, + "%s" + "\n", + discard_filter ? "" : " \n"); + _cairo_memory_stream_copy (mask_stream, document->xml_node_defs); + + status = _cairo_output_stream_destroy (mask_stream); + if (unlikely (status)) + return status; + + snprintf (buffer, sizeof buffer, "mask=\"url(#mask%d)\"", + mask_id); + status = _cairo_svg_surface_emit_paint (surface->xml_node, surface, op, source, 0, buffer); + if (unlikely (status)) + return status; + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_int_status_t +_cairo_svg_surface_stroke (void *abstract_dst, + cairo_operator_t op, + const cairo_pattern_t *source, + cairo_path_fixed_t *path, + const cairo_stroke_style_t *stroke_style, + const cairo_matrix_t *ctm, + const cairo_matrix_t *ctm_inverse, + double tolerance, + cairo_antialias_t antialias, + cairo_clip_t *clip) +{ + cairo_svg_surface_t *surface = abstract_dst; + cairo_status_t status; + + if (surface->paginated_mode == CAIRO_PAGINATED_MODE_ANALYZE) + return _cairo_svg_surface_analyze_operation (surface, op, source); + + assert (_cairo_svg_surface_operation_supported (surface, op, source)); + + status = _cairo_surface_clipper_set_clip (&surface->clipper, clip); + if (unlikely (status)) + return status; + + _cairo_output_stream_printf (surface->xml_node, "xml_node, surface, op, + source, stroke_style, ctm_inverse); + if (unlikely (status)) + return status; + + _cairo_output_stream_printf (surface->xml_node, "\" "); + + _cairo_svg_surface_emit_path (surface->xml_node, path, ctm_inverse); + + _cairo_svg_surface_emit_transform (surface->xml_node, " transform", ctm, NULL); + _cairo_output_stream_printf (surface->xml_node, "/>\n"); + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_int_status_t +_cairo_svg_surface_show_glyphs (void *abstract_surface, + cairo_operator_t op, + const cairo_pattern_t *pattern, + cairo_glyph_t *glyphs, + int num_glyphs, + cairo_scaled_font_t *scaled_font, + cairo_clip_t *clip, + int *remaining_glyphs) +{ + cairo_svg_surface_t *surface = abstract_surface; + cairo_svg_document_t *document = surface->document; + cairo_path_fixed_t path; + cairo_status_t status; + cairo_scaled_font_subsets_glyph_t subset_glyph; + int i; + + if (surface->paginated_mode == CAIRO_PAGINATED_MODE_ANALYZE) + return _cairo_svg_surface_analyze_operation (surface, op, pattern); + + assert (_cairo_svg_surface_operation_supported (surface, op, pattern)); + + if (num_glyphs <= 0) + return CAIRO_STATUS_SUCCESS; + + status = _cairo_surface_clipper_set_clip (&surface->clipper, clip); + if (unlikely (status)) + return status; + + /* FIXME it's probably possible to apply a pattern of a gradient to + * a group of symbols, but I don't know how yet. Gradients or patterns + * are translated by x and y properties of use element. */ + if (pattern->type != CAIRO_PATTERN_TYPE_SOLID) + goto FALLBACK; + + _cairo_output_stream_printf (surface->xml_node, "xml_node, FALSE, NULL); + if (unlikely (status)) + return status; + + _cairo_svg_surface_emit_operator_for_style (surface->xml_node, surface, op); + + _cairo_output_stream_printf (surface->xml_node, "\">\n"); + + for (i = 0; i < num_glyphs; i++) { + status = _cairo_scaled_font_subsets_map_glyph (document->font_subsets, + scaled_font, glyphs[i].index, + NULL, 0, + &subset_glyph); + if (status == CAIRO_INT_STATUS_UNSUPPORTED) { + _cairo_output_stream_printf (surface->xml_node, "\n"); + + glyphs += i; + num_glyphs -= i; + goto FALLBACK; + } + + if (unlikely (status)) + return status; + + _cairo_output_stream_printf (surface->xml_node, + " \n", + subset_glyph.font_id, + subset_glyph.subset_glyph_index, + glyphs[i].x, glyphs[i].y); + } + + _cairo_output_stream_printf (surface->xml_node, "\n"); + + return CAIRO_STATUS_SUCCESS; + +FALLBACK: + _cairo_path_fixed_init (&path); + + status = _cairo_scaled_font_glyph_path (scaled_font, + (cairo_glyph_t *) glyphs, + num_glyphs, &path); + + if (unlikely (status)) { + _cairo_path_fixed_fini (&path); + return status; + } + + status = _cairo_svg_surface_fill (abstract_surface, op, pattern, + &path, CAIRO_FILL_RULE_WINDING, + 0.0, CAIRO_ANTIALIAS_SUBPIXEL, + clip); + + _cairo_path_fixed_fini (&path); + + return status; +} + +static void +_cairo_svg_surface_get_font_options (void *abstract_surface, + cairo_font_options_t *options) +{ + _cairo_font_options_init_default (options); + + cairo_font_options_set_hint_style (options, CAIRO_HINT_STYLE_NONE); + cairo_font_options_set_hint_metrics (options, CAIRO_HINT_METRICS_OFF); + cairo_font_options_set_antialias (options, CAIRO_ANTIALIAS_GRAY); +} + +static const cairo_surface_backend_t cairo_svg_surface_backend = { + CAIRO_SURFACE_TYPE_SVG, + NULL, /* create_similar: handled by wrapper */ + _cairo_svg_surface_finish, + NULL, /* acquire_source_image */ + NULL, /* release_source_image */ + NULL, /* acquire_dest_image */ + NULL, /* release_dest_image */ + NULL, /* clone_similar */ + NULL, /* _cairo_svg_surface_composite, */ + NULL, /* _cairo_svg_surface_fill_rectangles, */ + NULL, /* _cairo_svg_surface_composite_trapezoids,*/ + NULL, /* create_span_renderer */ + NULL, /* check_span_renderer */ + _cairo_svg_surface_copy_page, + _cairo_svg_surface_show_page, + _cairo_svg_surface_get_extents, + NULL, /* _cairo_svg_surface_old_show_glyphs, */ + _cairo_svg_surface_get_font_options, + NULL, /* flush */ + NULL, /* mark dirty rectangle */ + NULL, /* scaled font fini */ + NULL, /* scaled glyph fini */ + _cairo_svg_surface_paint, + _cairo_svg_surface_mask, + _cairo_svg_surface_stroke, + _cairo_svg_surface_fill, + _cairo_svg_surface_show_glyphs, + NULL, /* snapshot */ + NULL, /* is_similar */ + _cairo_svg_surface_fill_stroke +}; + +static cairo_status_t +_cairo_svg_document_create (cairo_output_stream_t *output_stream, + double width, + double height, + cairo_svg_version_t version, + cairo_svg_document_t **document_out) +{ + cairo_svg_document_t *document; + cairo_status_t status, status_ignored; + + if (output_stream->status) + return output_stream->status; + + document = malloc (sizeof (cairo_svg_document_t)); + if (unlikely (document == NULL)) + return _cairo_error (CAIRO_STATUS_NO_MEMORY); + + /* The use of defs for font glyphs imposes no per-subset limit. */ + document->font_subsets = _cairo_scaled_font_subsets_create_scaled (); + if (unlikely (document->font_subsets == NULL)) { + status = _cairo_error (CAIRO_STATUS_NO_MEMORY); + goto CLEANUP_DOCUMENT; + } + + document->output_stream = output_stream; + document->refcount = 1; + document->owner = NULL; + document->finished = FALSE; + document->width = width; + document->height = height; + + document->linear_pattern_id = 0; + document->radial_pattern_id = 0; + document->pattern_id = 0; + document->filter_id = 0; + document->clip_id = 0; + document->mask_id = 0; + + document->xml_node_defs = _cairo_memory_stream_create (); + status = _cairo_output_stream_get_status (document->xml_node_defs); + if (unlikely (status)) + goto CLEANUP_NODE_DEFS; + + document->xml_node_glyphs = _cairo_memory_stream_create (); + status = _cairo_output_stream_get_status (document->xml_node_glyphs); + if (unlikely (status)) + goto CLEANUP_NODE_GLYPHS; + + document->alpha_filter = FALSE; + + document->svg_version = version; + + *document_out = document; + return CAIRO_STATUS_SUCCESS; + + CLEANUP_NODE_GLYPHS: + status_ignored = _cairo_output_stream_destroy (document->xml_node_glyphs); + CLEANUP_NODE_DEFS: + status_ignored = _cairo_output_stream_destroy (document->xml_node_defs); + _cairo_scaled_font_subsets_destroy (document->font_subsets); + CLEANUP_DOCUMENT: + free (document); + return status; +} + +static cairo_svg_document_t * +_cairo_svg_document_reference (cairo_svg_document_t *document) +{ + document->refcount++; + + return document; +} + +static unsigned int +_cairo_svg_document_allocate_mask_id (cairo_svg_document_t *document) +{ + return document->mask_id++; +} + +static cairo_status_t +_cairo_svg_document_destroy (cairo_svg_document_t *document) +{ + cairo_status_t status; + + document->refcount--; + if (document->refcount > 0) + return CAIRO_STATUS_SUCCESS; + + status = _cairo_svg_document_finish (document); + + free (document); + + return status; +} + +static cairo_status_t +_cairo_svg_document_finish (cairo_svg_document_t *document) +{ + cairo_status_t status, status2; + cairo_output_stream_t *output = document->output_stream; + cairo_svg_page_t *page; + unsigned int i; + + if (document->finished) + return CAIRO_STATUS_SUCCESS; + + /* + * Should we add DOCTYPE? + * + * Google says no. + * + * http://tech.groups.yahoo.com/group/svg-developers/message/48562: + * There's a bunch of issues, but just to pick a few: + * - they'll give false positives. + * - they'll give false negatives. + * - they're namespace-unaware. + * - they don't wildcard. + * So when they say OK they really haven't checked anything, when + * they say NOT OK they might be on crack, and like all + * namespace-unaware things they're a dead branch of the XML tree. + * + * http://jwatt.org/svg/authoring/: + * Unfortunately the SVG DTDs are a source of so many issues that the + * SVG WG has decided not to write one for the upcoming SVG 1.2 + * standard. In fact SVG WG members are even telling people not to use + * a DOCTYPE declaration in SVG 1.0 and 1.1 documents. + */ + + _cairo_output_stream_printf (output, + "\n" + "\n", + document->width, document->height, + document->width, document->height, + _cairo_svg_internal_version_strings [document->svg_version]); + + status = _cairo_svg_document_emit_font_subsets (document); + + if (_cairo_memory_stream_length (document->xml_node_glyphs) > 0 || + _cairo_memory_stream_length (document->xml_node_defs) > 0) { + _cairo_output_stream_printf (output, "\n"); + if (_cairo_memory_stream_length (document->xml_node_glyphs) > 0) { + _cairo_output_stream_printf (output, "\n"); + _cairo_memory_stream_copy (document->xml_node_glyphs, output); + _cairo_output_stream_printf (output, "\n"); + } + _cairo_memory_stream_copy (document->xml_node_defs, output); + _cairo_output_stream_printf (output, "\n"); + } + + if (document->owner != NULL) { + cairo_svg_surface_t *surface; + + surface = (cairo_svg_surface_t *) _cairo_paginated_surface_get_target (document->owner); + if (surface->xml_node != NULL && + _cairo_memory_stream_length (surface->xml_node) > 0) { + if (unlikely (_cairo_svg_surface_store_page (surface) == NULL)) { + if (status == CAIRO_STATUS_SUCCESS) + status = _cairo_error (CAIRO_STATUS_NO_MEMORY); + } + } + + if (surface->page_set.num_elements > 1 && + _cairo_svg_version_has_page_set_support (document->svg_version)) { + _cairo_output_stream_printf (output, "\n"); + for (i = 0; i < surface->page_set.num_elements; i++) { + page = _cairo_array_index (&surface->page_set, i); + _cairo_output_stream_printf (output, "\n"); + _cairo_output_stream_printf (output, + "\n", + page->surface_id); + _cairo_memory_stream_copy (page->xml_node, output); + _cairo_output_stream_printf (output, "\n\n"); + } + _cairo_output_stream_printf (output, "\n"); + } else if (surface->page_set.num_elements > 0) { + page = _cairo_array_index (&surface->page_set, surface->page_set.num_elements - 1); + _cairo_output_stream_printf (output, + "\n", + page->surface_id); + _cairo_memory_stream_copy (page->xml_node, output); + _cairo_output_stream_printf (output, "\n"); + } + } + + _cairo_output_stream_printf (output, "\n"); + + status2 = _cairo_output_stream_destroy (document->xml_node_glyphs); + if (status == CAIRO_STATUS_SUCCESS) + status = status2; + + status2 = _cairo_output_stream_destroy (document->xml_node_defs); + if (status == CAIRO_STATUS_SUCCESS) + status = status2; + + status2 = _cairo_output_stream_destroy (output); + if (status == CAIRO_STATUS_SUCCESS) + status = status2; + + document->finished = TRUE; + + return status; +} + +static void +_cairo_svg_surface_set_paginated_mode (void *abstract_surface, + cairo_paginated_mode_t paginated_mode) +{ + cairo_svg_surface_t *surface = abstract_surface; + + surface->paginated_mode = paginated_mode; +} + +static cairo_bool_t +_cairo_svg_surface_supports_fine_grained_fallbacks (void *abstract_surface) +{ + cairo_svg_surface_t *surface = abstract_surface; + cairo_int_status_t status = CAIRO_INT_STATUS_UNSUPPORTED; + + if (surface->document->svg_version >= CAIRO_SVG_VERSION_1_2) { + status = _cairo_svg_surface_analyze_operator (surface, + CAIRO_OPERATOR_SOURCE); + } + + return status == CAIRO_STATUS_SUCCESS; +} + +static const cairo_paginated_surface_backend_t cairo_svg_surface_paginated_backend = { + NULL /*_cairo_svg_surface_start_page*/, + _cairo_svg_surface_set_paginated_mode, + NULL, /* _cairo_svg_surface_set_bounding_box */ + NULL, /* _cairo_svg_surface_set_fallback_images_required */ + _cairo_svg_surface_supports_fine_grained_fallbacks, + +}; diff --git a/programs/develop/libraries/cairo/src/cairo-truetype-subset.c b/programs/develop/libraries/cairo/src/cairo-truetype-subset.c new file mode 100644 index 0000000000..9bf2f8ffc6 --- /dev/null +++ b/programs/develop/libraries/cairo/src/cairo-truetype-subset.c @@ -0,0 +1,1433 @@ +/* cairo - a vector graphics library with display and print output + * + * Copyright © 2004 Red Hat, Inc + * + * This library is free software; you can redistribute it and/or + * modify it either under the terms of the GNU Lesser General Public + * License version 2.1 as published by the Free Software Foundation + * (the "LGPL") or, at your option, under the terms of the Mozilla + * Public License Version 1.1 (the "MPL"). If you do not alter this + * notice, a recipient may use your version of this file under either + * the MPL or the LGPL. + * + * You should have received a copy of the LGPL along with this library + * in the file COPYING-LGPL-2.1; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA + * You should have received a copy of the MPL along with this library + * in the file COPYING-MPL-1.1 + * + * The contents of this file are subject to the Mozilla Public License + * Version 1.1 (the "License"); you may not use this file except in + * compliance with the License. You may obtain a copy of the License at + * http://www.mozilla.org/MPL/ + * + * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY + * OF ANY KIND, either express or implied. See the LGPL or the MPL for + * the specific language governing rights and limitations. + * + * The Original Code is the cairo graphics library. + * + * The Initial Developer of the Original Code is Red Hat, Inc. + * + * Contributor(s): + * Kristian Høgsberg + * Adrian Johnson + */ + +/* + * Useful links: + * http://developer.apple.com/textfonts/TTRefMan/RM06/Chap6.html + * http://www.microsoft.com/typography/specs/default.htm + */ + +#define _BSD_SOURCE /* for snprintf(), strdup() */ +#include "cairoint.h" +#include "cairo-error-private.h" + +#if CAIRO_HAS_FONT_SUBSET + +#include "cairo-scaled-font-subsets-private.h" +#include "cairo-truetype-subset-private.h" + + +typedef struct subset_glyph subset_glyph_t; +struct subset_glyph { + int parent_index; + unsigned long location; +}; + +typedef struct _cairo_truetype_font cairo_truetype_font_t; + +typedef struct table table_t; +struct table { + unsigned long tag; + cairo_status_t (*write) (cairo_truetype_font_t *font, unsigned long tag); + int pos; /* position in the font directory */ +}; + +struct _cairo_truetype_font { + + cairo_scaled_font_subset_t *scaled_font_subset; + + table_t truetype_tables[10]; + int num_tables; + + struct { + char *font_name; + char *ps_name; + unsigned int num_glyphs; + int *widths; + long x_min, y_min, x_max, y_max; + long ascent, descent; + int units_per_em; + } base; + + subset_glyph_t *glyphs; + const cairo_scaled_font_backend_t *backend; + int num_glyphs_in_face; + int checksum_index; + cairo_array_t output; + cairo_array_t string_offsets; + unsigned long last_offset; + unsigned long last_boundary; + int *parent_to_subset; + cairo_status_t status; + +}; + +/* + * Test that the structs we define for TrueType tables have the + * correct size, ie. they are not padded. + */ +#define check(T, S) COMPILE_TIME_ASSERT (sizeof (T) == (S)) +check (tt_head_t, 54); +check (tt_hhea_t, 36); +check (tt_maxp_t, 32); +check (tt_name_record_t, 12); +check (tt_name_t, 18); +check (tt_name_t, 18); +check (tt_composite_glyph_t, 16); +check (tt_glyph_data_t, 26); +#undef check + +static cairo_status_t +cairo_truetype_font_use_glyph (cairo_truetype_font_t *font, + unsigned short glyph, + unsigned short *out); + +#define SFNT_VERSION 0x00010000 +#define SFNT_STRING_MAX_LENGTH 65535 + +static cairo_status_t +_cairo_truetype_font_set_error (cairo_truetype_font_t *font, + cairo_status_t status) +{ + if (status == CAIRO_STATUS_SUCCESS || status == CAIRO_INT_STATUS_UNSUPPORTED) + return status; + + _cairo_status_set_error (&font->status, status); + + return _cairo_error (status); +} + +static cairo_status_t +_cairo_truetype_font_create (cairo_scaled_font_subset_t *scaled_font_subset, + cairo_truetype_font_t **font_return) +{ + cairo_status_t status; + cairo_truetype_font_t *font; + const cairo_scaled_font_backend_t *backend; + tt_head_t head; + tt_hhea_t hhea; + tt_maxp_t maxp; + unsigned long size; + + backend = scaled_font_subset->scaled_font->backend; + if (!backend->load_truetype_table) + return CAIRO_INT_STATUS_UNSUPPORTED; + + /* FIXME: We should either support subsetting vertical fonts, or fail on + * vertical. Currently font_options_t doesn't have vertical flag, but + * it should be added in the future. For now, the freetype backend + * returns UNSUPPORTED in load_truetype_table if the font is vertical. + * + * if (cairo_font_options_get_vertical_layout (scaled_font_subset->scaled_font)) + * return CAIRO_INT_STATUS_UNSUPPORTED; + */ + + size = sizeof (tt_head_t); + status = backend->load_truetype_table (scaled_font_subset->scaled_font, + TT_TAG_head, 0, + (unsigned char *) &head, + &size); + if (unlikely (status)) + return status; + + size = sizeof (tt_maxp_t); + status = backend->load_truetype_table (scaled_font_subset->scaled_font, + TT_TAG_maxp, 0, + (unsigned char *) &maxp, + &size); + if (unlikely (status)) + return status; + + size = sizeof (tt_hhea_t); + status = backend->load_truetype_table (scaled_font_subset->scaled_font, + TT_TAG_hhea, 0, + (unsigned char *) &hhea, + &size); + if (unlikely (status)) + return status; + + font = malloc (sizeof (cairo_truetype_font_t)); + if (unlikely (font == NULL)) + return _cairo_error (CAIRO_STATUS_NO_MEMORY); + + font->backend = backend; + font->num_glyphs_in_face = be16_to_cpu (maxp.num_glyphs); + font->scaled_font_subset = scaled_font_subset; + + font->last_offset = 0; + font->last_boundary = 0; + _cairo_array_init (&font->output, sizeof (char)); + status = _cairo_array_grow_by (&font->output, 4096); + if (unlikely (status)) + goto fail1; + + font->glyphs = calloc (font->num_glyphs_in_face + 1, sizeof (subset_glyph_t)); + if (unlikely (font->glyphs == NULL)) { + status = _cairo_error (CAIRO_STATUS_NO_MEMORY); + goto fail1; + } + + font->parent_to_subset = calloc (font->num_glyphs_in_face, sizeof (int)); + if (unlikely (font->parent_to_subset == NULL)) { + status = _cairo_error (CAIRO_STATUS_NO_MEMORY); + goto fail2; + } + + font->base.num_glyphs = 0; + font->base.x_min = (int16_t) be16_to_cpu (head.x_min); + font->base.y_min = (int16_t) be16_to_cpu (head.y_min); + font->base.x_max = (int16_t) be16_to_cpu (head.x_max); + font->base.y_max = (int16_t) be16_to_cpu (head.y_max); + font->base.ascent = (int16_t) be16_to_cpu (hhea.ascender); + font->base.descent = (int16_t) be16_to_cpu (hhea.descender); + font->base.units_per_em = (int16_t) be16_to_cpu (head.units_per_em); + if (font->base.units_per_em == 0) + font->base.units_per_em = 2048; + + font->base.ps_name = NULL; + font->base.font_name = NULL; + status = _cairo_truetype_read_font_name (scaled_font_subset->scaled_font, + &font->base.ps_name, + &font->base.font_name); + if (_cairo_status_is_error (status)) + goto fail3; + + /* If the PS name is not found, create a CairoFont-x-y name. */ + if (font->base.ps_name == NULL) { + font->base.ps_name = malloc (30); + if (unlikely (font->base.ps_name == NULL)) { + status = _cairo_error (CAIRO_STATUS_NO_MEMORY); + goto fail3; + } + + snprintf(font->base.ps_name, 30, "CairoFont-%u-%u", + scaled_font_subset->font_id, + scaled_font_subset->subset_id); + } + + font->base.widths = calloc (font->num_glyphs_in_face, sizeof (int)); + if (unlikely (font->base.widths == NULL)) { + status = _cairo_error (CAIRO_STATUS_NO_MEMORY); + goto fail4; + } + + _cairo_array_init (&font->string_offsets, sizeof (unsigned long)); + status = _cairo_array_grow_by (&font->string_offsets, 10); + if (unlikely (status)) + goto fail5; + + font->status = CAIRO_STATUS_SUCCESS; + + *font_return = font; + + return CAIRO_STATUS_SUCCESS; + + fail5: + _cairo_array_fini (&font->string_offsets); + free (font->base.widths); + fail4: + free (font->base.ps_name); + fail3: + free (font->parent_to_subset); + if (font->base.font_name) + free (font->base.font_name); + fail2: + free (font->glyphs); + fail1: + _cairo_array_fini (&font->output); + free (font); + + return status; +} + +static void +cairo_truetype_font_destroy (cairo_truetype_font_t *font) +{ + _cairo_array_fini (&font->string_offsets); + free (font->base.widths); + free (font->base.ps_name); + if (font->base.font_name) + free (font->base.font_name); + free (font->parent_to_subset); + free (font->glyphs); + _cairo_array_fini (&font->output); + free (font); +} + +static cairo_status_t +cairo_truetype_font_allocate_write_buffer (cairo_truetype_font_t *font, + size_t length, + unsigned char **buffer) +{ + cairo_status_t status; + + if (font->status) + return font->status; + + status = _cairo_array_allocate (&font->output, length, (void **) buffer); + if (unlikely (status)) + return _cairo_truetype_font_set_error (font, status); + + return CAIRO_STATUS_SUCCESS; +} + +static void +cairo_truetype_font_write (cairo_truetype_font_t *font, + const void *data, + size_t length) +{ + cairo_status_t status; + + if (font->status) + return; + + status = _cairo_array_append_multiple (&font->output, data, length); + if (unlikely (status)) + status = _cairo_truetype_font_set_error (font, status); +} + +static void +cairo_truetype_font_write_be16 (cairo_truetype_font_t *font, + uint16_t value) +{ + uint16_t be16_value; + + if (font->status) + return; + + be16_value = cpu_to_be16 (value); + cairo_truetype_font_write (font, &be16_value, sizeof be16_value); +} + +static void +cairo_truetype_font_write_be32 (cairo_truetype_font_t *font, + uint32_t value) +{ + uint32_t be32_value; + + if (font->status) + return; + + be32_value = cpu_to_be32 (value); + cairo_truetype_font_write (font, &be32_value, sizeof be32_value); +} + +static cairo_status_t +cairo_truetype_font_align_output (cairo_truetype_font_t *font, + unsigned long *aligned) +{ + int length, pad; + unsigned char *padding; + + length = _cairo_array_num_elements (&font->output); + *aligned = (length + 3) & ~3; + pad = *aligned - length; + + if (pad) { + cairo_status_t status; + + status = cairo_truetype_font_allocate_write_buffer (font, pad, + &padding); + if (unlikely (status)) + return status; + + memset (padding, 0, pad); + } + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_status_t +cairo_truetype_font_check_boundary (cairo_truetype_font_t *font, + unsigned long boundary) +{ + cairo_status_t status; + + if (font->status) + return font->status; + + if (boundary - font->last_offset > SFNT_STRING_MAX_LENGTH) + { + status = _cairo_array_append (&font->string_offsets, + &font->last_boundary); + if (unlikely (status)) + return _cairo_truetype_font_set_error (font, status); + + font->last_offset = font->last_boundary; + } + font->last_boundary = boundary; + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_status_t +cairo_truetype_font_write_cmap_table (cairo_truetype_font_t *font, + unsigned long tag) +{ + unsigned int i; + + cairo_truetype_font_write_be16 (font, 0); /* Table version */ + cairo_truetype_font_write_be16 (font, 2); /* Num tables */ + + cairo_truetype_font_write_be16 (font, 3); /* Platform */ + cairo_truetype_font_write_be16 (font, 0); /* Encoding */ + cairo_truetype_font_write_be32 (font, 20); /* Offset to start of table */ + + cairo_truetype_font_write_be16 (font, 1); /* Platform */ + cairo_truetype_font_write_be16 (font, 0); /* Encoding */ + cairo_truetype_font_write_be32 (font, 52); /* Offset to start of table */ + + /* Output a format 4 encoding table. */ + + cairo_truetype_font_write_be16 (font, 4); /* Format */ + cairo_truetype_font_write_be16 (font, 32); /* Length */ + cairo_truetype_font_write_be16 (font, 0); /* Version */ + cairo_truetype_font_write_be16 (font, 4); /* 2*segcount */ + cairo_truetype_font_write_be16 (font, 4); /* searchrange */ + cairo_truetype_font_write_be16 (font, 1); /* entry selector */ + cairo_truetype_font_write_be16 (font, 0); /* rangeshift */ + cairo_truetype_font_write_be16 (font, 0xf000 + font->base.num_glyphs - 1); /* end count[0] */ + cairo_truetype_font_write_be16 (font, 0xffff); /* end count[1] */ + cairo_truetype_font_write_be16 (font, 0); /* reserved */ + cairo_truetype_font_write_be16 (font, 0xf000); /* startCode[0] */ + cairo_truetype_font_write_be16 (font, 0xffff); /* startCode[1] */ + cairo_truetype_font_write_be16 (font, 0x1000); /* delta[0] */ + cairo_truetype_font_write_be16 (font, 1); /* delta[1] */ + cairo_truetype_font_write_be16 (font, 0); /* rangeOffset[0] */ + cairo_truetype_font_write_be16 (font, 0); /* rangeOffset[1] */ + + /* Output a format 6 encoding table. */ + + cairo_truetype_font_write_be16 (font, 6); + cairo_truetype_font_write_be16 (font, 10 + 2 * font->base.num_glyphs); + cairo_truetype_font_write_be16 (font, 0); + cairo_truetype_font_write_be16 (font, 0); /* First character */ + cairo_truetype_font_write_be16 (font, font->base.num_glyphs); + for (i = 0; i < font->base.num_glyphs; i++) + cairo_truetype_font_write_be16 (font, i); + + return font->status; +} + +static cairo_status_t +cairo_truetype_font_write_generic_table (cairo_truetype_font_t *font, + unsigned long tag) +{ + cairo_status_t status; + unsigned char *buffer; + unsigned long size; + + if (font->status) + return font->status; + + size = 0; + status = font->backend->load_truetype_table(font->scaled_font_subset->scaled_font, + tag, 0, NULL, &size); + if (unlikely (status)) + return _cairo_truetype_font_set_error (font, status); + + status = cairo_truetype_font_allocate_write_buffer (font, size, &buffer); + if (unlikely (status)) + return _cairo_truetype_font_set_error (font, status); + + status = font->backend->load_truetype_table (font->scaled_font_subset->scaled_font, + tag, 0, buffer, &size); + if (unlikely (status)) + return _cairo_truetype_font_set_error (font, status); + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_status_t +cairo_truetype_font_remap_composite_glyph (cairo_truetype_font_t *font, + unsigned char *buffer, + unsigned long size) +{ + tt_glyph_data_t *glyph_data; + tt_composite_glyph_t *composite_glyph; + int num_args; + int has_more_components; + unsigned short flags; + unsigned short index; + cairo_status_t status; + unsigned char *end = buffer + size; + + if (font->status) + return font->status; + + glyph_data = (tt_glyph_data_t *) buffer; + if ((unsigned char *)(&glyph_data->data) >= end) + return CAIRO_INT_STATUS_UNSUPPORTED; + + if ((int16_t)be16_to_cpu (glyph_data->num_contours) >= 0) + return CAIRO_STATUS_SUCCESS; + + composite_glyph = &glyph_data->glyph; + do { + if ((unsigned char *)(&composite_glyph->args[1]) > end) + return CAIRO_INT_STATUS_UNSUPPORTED; + + flags = be16_to_cpu (composite_glyph->flags); + has_more_components = flags & TT_MORE_COMPONENTS; + status = cairo_truetype_font_use_glyph (font, be16_to_cpu (composite_glyph->index), &index); + if (unlikely (status)) + return status; + + composite_glyph->index = cpu_to_be16 (index); + num_args = 1; + if (flags & TT_ARG_1_AND_2_ARE_WORDS) + num_args += 1; + + if (flags & TT_WE_HAVE_A_SCALE) + num_args += 1; + else if (flags & TT_WE_HAVE_AN_X_AND_Y_SCALE) + num_args += 2; + else if (flags & TT_WE_HAVE_A_TWO_BY_TWO) + num_args += 4; + + composite_glyph = (tt_composite_glyph_t *) &(composite_glyph->args[num_args]); + } while (has_more_components); + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_status_t +cairo_truetype_font_write_glyf_table (cairo_truetype_font_t *font, + unsigned long tag) +{ + unsigned long start_offset, index, size, next; + tt_head_t header; + unsigned long begin, end; + unsigned char *buffer; + unsigned int i; + union { + unsigned char *bytes; + uint16_t *short_offsets; + uint32_t *long_offsets; + } u; + cairo_status_t status; + + if (font->status) + return font->status; + + size = sizeof (tt_head_t); + status = font->backend->load_truetype_table (font->scaled_font_subset->scaled_font, + TT_TAG_head, 0, + (unsigned char*) &header, &size); + if (unlikely (status)) + return _cairo_truetype_font_set_error (font, status); + + if (be16_to_cpu (header.index_to_loc_format) == 0) + size = sizeof (int16_t) * (font->num_glyphs_in_face + 1); + else + size = sizeof (int32_t) * (font->num_glyphs_in_face + 1); + + u.bytes = malloc (size); + if (unlikely (u.bytes == NULL)) + return _cairo_truetype_font_set_error (font, CAIRO_STATUS_NO_MEMORY); + + status = font->backend->load_truetype_table (font->scaled_font_subset->scaled_font, + TT_TAG_loca, 0, u.bytes, &size); + if (unlikely (status)) + return _cairo_truetype_font_set_error (font, status); + + start_offset = _cairo_array_num_elements (&font->output); + for (i = 0; i < font->base.num_glyphs; i++) { + index = font->glyphs[i].parent_index; + if (be16_to_cpu (header.index_to_loc_format) == 0) { + begin = be16_to_cpu (u.short_offsets[index]) * 2; + end = be16_to_cpu (u.short_offsets[index + 1]) * 2; + } + else { + begin = be32_to_cpu (u.long_offsets[index]); + end = be32_to_cpu (u.long_offsets[index + 1]); + } + + /* quick sanity check... */ + if (end < begin) { + status = CAIRO_INT_STATUS_UNSUPPORTED; + goto FAIL; + } + + size = end - begin; + status = cairo_truetype_font_align_output (font, &next); + if (unlikely (status)) + goto FAIL; + + status = cairo_truetype_font_check_boundary (font, next); + if (unlikely (status)) + goto FAIL; + + font->glyphs[i].location = next - start_offset; + + status = cairo_truetype_font_allocate_write_buffer (font, size, &buffer); + if (unlikely (status)) + goto FAIL; + + if (size != 0) { + status = font->backend->load_truetype_table (font->scaled_font_subset->scaled_font, + TT_TAG_glyf, begin, buffer, &size); + if (unlikely (status)) + goto FAIL; + + status = cairo_truetype_font_remap_composite_glyph (font, buffer, size); + if (unlikely (status)) + goto FAIL; + } + } + + status = cairo_truetype_font_align_output (font, &next); + if (unlikely (status)) + goto FAIL; + + font->glyphs[i].location = next - start_offset; + + status = font->status; +FAIL: + free (u.bytes); + + return _cairo_truetype_font_set_error (font, status); +} + +static cairo_status_t +cairo_truetype_font_write_head_table (cairo_truetype_font_t *font, + unsigned long tag) +{ + unsigned char *buffer; + unsigned long size; + cairo_status_t status; + + if (font->status) + return font->status; + + size = 0; + status = font->backend->load_truetype_table (font->scaled_font_subset->scaled_font, + tag, 0, NULL, &size); + if (unlikely (status)) + return _cairo_truetype_font_set_error (font, status); + + font->checksum_index = _cairo_array_num_elements (&font->output) + 8; + status = cairo_truetype_font_allocate_write_buffer (font, size, &buffer); + if (unlikely (status)) + return _cairo_truetype_font_set_error (font, status); + + status = font->backend->load_truetype_table (font->scaled_font_subset->scaled_font, + tag, 0, buffer, &size); + if (unlikely (status)) + return _cairo_truetype_font_set_error (font, status); + + /* set checkSumAdjustment to 0 for table checksum calculation */ + *(uint32_t *)(buffer + 8) = 0; + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_status_t +cairo_truetype_font_write_hhea_table (cairo_truetype_font_t *font, unsigned long tag) +{ + tt_hhea_t *hhea; + unsigned long size; + cairo_status_t status; + + if (font->status) + return font->status; + + size = sizeof (tt_hhea_t); + status = cairo_truetype_font_allocate_write_buffer (font, size, (unsigned char **) &hhea); + if (unlikely (status)) + return _cairo_truetype_font_set_error (font, status); + + status = font->backend->load_truetype_table (font->scaled_font_subset->scaled_font, + tag, 0, (unsigned char *) hhea, &size); + if (unlikely (status)) + return _cairo_truetype_font_set_error (font, status); + + hhea->num_hmetrics = cpu_to_be16 ((uint16_t)(font->base.num_glyphs)); + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_status_t +cairo_truetype_font_write_hmtx_table (cairo_truetype_font_t *font, + unsigned long tag) +{ + unsigned long size; + unsigned long long_entry_size; + unsigned long short_entry_size; + short *p; + unsigned int i; + tt_hhea_t hhea; + int num_hmetrics; + cairo_status_t status; + + if (font->status) + return font->status; + + size = sizeof (tt_hhea_t); + status = font->backend->load_truetype_table (font->scaled_font_subset->scaled_font, + TT_TAG_hhea, 0, + (unsigned char*) &hhea, &size); + if (unlikely (status)) + return _cairo_truetype_font_set_error (font, status); + + num_hmetrics = be16_to_cpu(hhea.num_hmetrics); + + for (i = 0; i < font->base.num_glyphs; i++) { + long_entry_size = 2 * sizeof (int16_t); + short_entry_size = sizeof (int16_t); + status = cairo_truetype_font_allocate_write_buffer (font, + long_entry_size, + (unsigned char **) &p); + if (unlikely (status)) + return _cairo_truetype_font_set_error (font, status); + + if (font->glyphs[i].parent_index < num_hmetrics) { + status = font->backend->load_truetype_table (font->scaled_font_subset->scaled_font, + TT_TAG_hmtx, + font->glyphs[i].parent_index * long_entry_size, + (unsigned char *) p, &long_entry_size); + if (unlikely (status)) + return _cairo_truetype_font_set_error (font, status); + } + else + { + status = font->backend->load_truetype_table (font->scaled_font_subset->scaled_font, + TT_TAG_hmtx, + (num_hmetrics - 1) * long_entry_size, + (unsigned char *) p, &short_entry_size); + if (unlikely (status)) + return _cairo_truetype_font_set_error (font, status); + + status = font->backend->load_truetype_table (font->scaled_font_subset->scaled_font, + TT_TAG_hmtx, + num_hmetrics * long_entry_size + + (font->glyphs[i].parent_index - num_hmetrics) * short_entry_size, + (unsigned char *) (p + 1), &short_entry_size); + if (unlikely (status)) + return _cairo_truetype_font_set_error (font, status); + } + font->base.widths[i] = be16_to_cpu (p[0]); + } + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_status_t +cairo_truetype_font_write_loca_table (cairo_truetype_font_t *font, + unsigned long tag) +{ + unsigned int i; + tt_head_t header; + unsigned long size; + cairo_status_t status; + + if (font->status) + return font->status; + + size = sizeof(tt_head_t); + status = font->backend->load_truetype_table (font->scaled_font_subset->scaled_font, + TT_TAG_head, 0, + (unsigned char*) &header, &size); + if (unlikely (status)) + return _cairo_truetype_font_set_error (font, status); + + if (be16_to_cpu (header.index_to_loc_format) == 0) + { + for (i = 0; i < font->base.num_glyphs + 1; i++) + cairo_truetype_font_write_be16 (font, font->glyphs[i].location / 2); + } else { + for (i = 0; i < font->base.num_glyphs + 1; i++) + cairo_truetype_font_write_be32 (font, font->glyphs[i].location); + } + + return font->status; +} + +static cairo_status_t +cairo_truetype_font_write_maxp_table (cairo_truetype_font_t *font, + unsigned long tag) +{ + tt_maxp_t *maxp; + unsigned long size; + cairo_status_t status; + + if (font->status) + return font->status; + + size = sizeof (tt_maxp_t); + status = cairo_truetype_font_allocate_write_buffer (font, size, (unsigned char **) &maxp); + if (unlikely (status)) + return _cairo_truetype_font_set_error (font, status); + + status = font->backend->load_truetype_table (font->scaled_font_subset->scaled_font, + tag, 0, (unsigned char *) maxp, &size); + if (unlikely (status)) + return _cairo_truetype_font_set_error (font, status); + + maxp->num_glyphs = cpu_to_be16 (font->base.num_glyphs); + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_status_t +cairo_truetype_font_write_offset_table (cairo_truetype_font_t *font) +{ + cairo_status_t status; + unsigned char *table_buffer; + size_t table_buffer_length; + unsigned short search_range, entry_selector, range_shift; + + if (font->status) + return font->status; + + search_range = 1; + entry_selector = 0; + while (search_range * 2 <= font->num_tables) { + search_range *= 2; + entry_selector++; + } + search_range *= 16; + range_shift = font->num_tables * 16 - search_range; + + cairo_truetype_font_write_be32 (font, SFNT_VERSION); + cairo_truetype_font_write_be16 (font, font->num_tables); + cairo_truetype_font_write_be16 (font, search_range); + cairo_truetype_font_write_be16 (font, entry_selector); + cairo_truetype_font_write_be16 (font, range_shift); + + /* Allocate space for the table directory. Each directory entry + * will be filled in by cairo_truetype_font_update_entry() after + * the table is written. */ + table_buffer_length = font->num_tables * 16; + status = cairo_truetype_font_allocate_write_buffer (font, table_buffer_length, + &table_buffer); + if (unlikely (status)) + return _cairo_truetype_font_set_error (font, status); + + return CAIRO_STATUS_SUCCESS; +} + +static uint32_t +cairo_truetype_font_calculate_checksum (cairo_truetype_font_t *font, + unsigned long start, + unsigned long end) +{ + uint32_t *padded_end; + uint32_t *p; + uint32_t checksum; + char *data; + + checksum = 0; + data = _cairo_array_index (&font->output, 0); + p = (uint32_t *) (data + start); + padded_end = (uint32_t *) (data + ((end + 3) & ~3)); + while (p < padded_end) + checksum += be32_to_cpu(*p++); + + return checksum; +} + +static void +cairo_truetype_font_update_entry (cairo_truetype_font_t *font, + int index, + unsigned long tag, + unsigned long start, + unsigned long end) +{ + uint32_t *entry; + + entry = _cairo_array_index (&font->output, 12 + 16 * index); + entry[0] = cpu_to_be32 ((uint32_t)tag); + entry[1] = cpu_to_be32 (cairo_truetype_font_calculate_checksum (font, start, end)); + entry[2] = cpu_to_be32 ((uint32_t)start); + entry[3] = cpu_to_be32 ((uint32_t)(end - start)); +} + +static cairo_status_t +cairo_truetype_font_generate (cairo_truetype_font_t *font, + const char **data, + unsigned long *length, + const unsigned long **string_offsets, + unsigned long *num_strings) +{ + cairo_status_t status; + unsigned long start, end, next; + uint32_t checksum, *checksum_location; + int i; + + if (font->status) + return font->status; + + status = cairo_truetype_font_write_offset_table (font); + if (unlikely (status)) + goto FAIL; + + status = cairo_truetype_font_align_output (font, &start); + if (unlikely (status)) + goto FAIL; + + end = 0; + for (i = 0; i < font->num_tables; i++) { + status = font->truetype_tables[i].write (font, font->truetype_tables[i].tag); + if (unlikely (status)) + goto FAIL; + + end = _cairo_array_num_elements (&font->output); + status = cairo_truetype_font_align_output (font, &next); + if (unlikely (status)) + goto FAIL; + + cairo_truetype_font_update_entry (font, font->truetype_tables[i].pos, + font->truetype_tables[i].tag, start, end); + status = cairo_truetype_font_check_boundary (font, next); + if (unlikely (status)) + goto FAIL; + + start = next; + } + + checksum = + 0xb1b0afba - cairo_truetype_font_calculate_checksum (font, 0, end); + checksum_location = _cairo_array_index (&font->output, font->checksum_index); + *checksum_location = cpu_to_be32 (checksum); + + *data = _cairo_array_index (&font->output, 0); + *length = _cairo_array_num_elements (&font->output); + *num_strings = _cairo_array_num_elements (&font->string_offsets); + if (*num_strings != 0) + *string_offsets = _cairo_array_index (&font->string_offsets, 0); + else + *string_offsets = NULL; + + FAIL: + return _cairo_truetype_font_set_error (font, status); +} + +static cairo_status_t +cairo_truetype_font_use_glyph (cairo_truetype_font_t *font, + unsigned short glyph, + unsigned short *out) +{ + if (glyph >= font->num_glyphs_in_face) + return CAIRO_INT_STATUS_UNSUPPORTED; + + if (font->parent_to_subset[glyph] == 0) { + font->parent_to_subset[glyph] = font->base.num_glyphs; + font->glyphs[font->base.num_glyphs].parent_index = glyph; + font->base.num_glyphs++; + } + + *out = font->parent_to_subset[glyph]; + return CAIRO_STATUS_SUCCESS; +} + +static void +cairo_truetype_font_add_truetype_table (cairo_truetype_font_t *font, + unsigned long tag, + cairo_status_t (*write) (cairo_truetype_font_t *font, unsigned long tag), + int pos) +{ + font->truetype_tables[font->num_tables].tag = tag; + font->truetype_tables[font->num_tables].write = write; + font->truetype_tables[font->num_tables].pos = pos; + font->num_tables++; +} + +/* cairo_truetype_font_create_truetype_table_list() builds the list of + * truetype tables to be embedded in the subsetted font. Each call to + * cairo_truetype_font_add_truetype_table() adds a table, the callback + * for generating the table, and the position in the table directory + * to the truetype_tables array. + * + * As we write out the glyf table we remap composite glyphs. + * Remapping composite glyphs will reference the sub glyphs the + * composite glyph is made up of. The "glyf" table callback needs to + * be called first so we have all the glyphs in the subset before + * going further. + * + * The order in which tables are added to the truetype_table array + * using cairo_truetype_font_add_truetype_table() specifies the order + * in which the callback functions will be called. + * + * The tables in the table directory must be listed in alphabetical + * order. The "cvt", "fpgm", and "prep" are optional tables. They + * will only be embedded in the subset if they exist in the source + * font. The pos parameter of cairo_truetype_font_add_truetype_table() + * specifies the position of the table in the table directory. + */ +static void +cairo_truetype_font_create_truetype_table_list (cairo_truetype_font_t *font) +{ + cairo_bool_t has_cvt = FALSE; + cairo_bool_t has_fpgm = FALSE; + cairo_bool_t has_prep = FALSE; + unsigned long size; + int pos; + + size = 0; + if (font->backend->load_truetype_table (font->scaled_font_subset->scaled_font, + TT_TAG_cvt, 0, NULL, + &size) == CAIRO_STATUS_SUCCESS) + has_cvt = TRUE; + + size = 0; + if (font->backend->load_truetype_table (font->scaled_font_subset->scaled_font, + TT_TAG_fpgm, 0, NULL, + &size) == CAIRO_STATUS_SUCCESS) + has_fpgm = TRUE; + + size = 0; + if (font->backend->load_truetype_table (font->scaled_font_subset->scaled_font, + TT_TAG_prep, 0, NULL, + &size) == CAIRO_STATUS_SUCCESS) + has_prep = TRUE; + + font->num_tables = 0; + pos = 1; + if (has_cvt) + pos++; + if (has_fpgm) + pos++; + cairo_truetype_font_add_truetype_table (font, TT_TAG_glyf, cairo_truetype_font_write_glyf_table, pos); + + pos = 0; + cairo_truetype_font_add_truetype_table (font, TT_TAG_cmap, cairo_truetype_font_write_cmap_table, pos++); + if (has_cvt) + cairo_truetype_font_add_truetype_table (font, TT_TAG_cvt, cairo_truetype_font_write_generic_table, pos++); + if (has_fpgm) + cairo_truetype_font_add_truetype_table (font, TT_TAG_fpgm, cairo_truetype_font_write_generic_table, pos++); + pos++; + cairo_truetype_font_add_truetype_table (font, TT_TAG_head, cairo_truetype_font_write_head_table, pos++); + cairo_truetype_font_add_truetype_table (font, TT_TAG_hhea, cairo_truetype_font_write_hhea_table, pos++); + cairo_truetype_font_add_truetype_table (font, TT_TAG_hmtx, cairo_truetype_font_write_hmtx_table, pos++); + cairo_truetype_font_add_truetype_table (font, TT_TAG_loca, cairo_truetype_font_write_loca_table, pos++); + cairo_truetype_font_add_truetype_table (font, TT_TAG_maxp, cairo_truetype_font_write_maxp_table, pos++); + if (has_prep) + cairo_truetype_font_add_truetype_table (font, TT_TAG_prep, cairo_truetype_font_write_generic_table, pos); +} + +cairo_status_t +_cairo_truetype_subset_init (cairo_truetype_subset_t *truetype_subset, + cairo_scaled_font_subset_t *font_subset) +{ + cairo_truetype_font_t *font = NULL; + cairo_status_t status; + const char *data = NULL; /* squelch bogus compiler warning */ + unsigned long length = 0; /* squelch bogus compiler warning */ + unsigned long offsets_length; + unsigned int i; + const unsigned long *string_offsets = NULL; + unsigned long num_strings = 0; + + status = _cairo_truetype_font_create (font_subset, &font); + if (unlikely (status)) + return status; + + for (i = 0; i < font->scaled_font_subset->num_glyphs; i++) { + unsigned short parent_glyph = font->scaled_font_subset->glyphs[i]; + status = cairo_truetype_font_use_glyph (font, parent_glyph, &parent_glyph); + if (unlikely (status)) + goto fail1; + } + + cairo_truetype_font_create_truetype_table_list (font); + status = cairo_truetype_font_generate (font, &data, &length, + &string_offsets, &num_strings); + if (unlikely (status)) + goto fail1; + + truetype_subset->ps_name = strdup (font->base.ps_name); + if (unlikely (truetype_subset->ps_name == NULL)) { + status = _cairo_error (CAIRO_STATUS_NO_MEMORY); + goto fail1; + } + + if (font->base.font_name != NULL) { + truetype_subset->font_name = strdup (font->base.font_name); + if (unlikely (truetype_subset->font_name == NULL)) { + status = _cairo_error (CAIRO_STATUS_NO_MEMORY); + goto fail2; + } + } else { + truetype_subset->font_name = NULL; + } + + /* The widths array returned must contain only widths for the + * glyphs in font_subset. Any subglyphs appended after + * font_subset->num_glyphs are omitted. */ + truetype_subset->widths = calloc (sizeof (double), + font->scaled_font_subset->num_glyphs); + if (unlikely (truetype_subset->widths == NULL)) { + status = _cairo_error (CAIRO_STATUS_NO_MEMORY); + goto fail3; + } + for (i = 0; i < font->scaled_font_subset->num_glyphs; i++) + truetype_subset->widths[i] = (double)font->base.widths[i]/font->base.units_per_em; + + truetype_subset->x_min = (double)font->base.x_min/font->base.units_per_em; + truetype_subset->y_min = (double)font->base.y_min/font->base.units_per_em; + truetype_subset->x_max = (double)font->base.x_max/font->base.units_per_em; + truetype_subset->y_max = (double)font->base.y_max/font->base.units_per_em; + truetype_subset->ascent = (double)font->base.ascent/font->base.units_per_em; + truetype_subset->descent = (double)font->base.descent/font->base.units_per_em; + + if (length) { + truetype_subset->data = malloc (length); + if (unlikely (truetype_subset->data == NULL)) { + status = _cairo_error (CAIRO_STATUS_NO_MEMORY); + goto fail4; + } + + memcpy (truetype_subset->data, data, length); + } else + truetype_subset->data = NULL; + truetype_subset->data_length = length; + + if (num_strings) { + offsets_length = num_strings * sizeof (unsigned long); + truetype_subset->string_offsets = malloc (offsets_length); + if (unlikely (truetype_subset->string_offsets == NULL)) { + status = _cairo_error (CAIRO_STATUS_NO_MEMORY); + goto fail5; + } + + memcpy (truetype_subset->string_offsets, string_offsets, offsets_length); + truetype_subset->num_string_offsets = num_strings; + } else { + truetype_subset->string_offsets = NULL; + truetype_subset->num_string_offsets = 0; + } + + cairo_truetype_font_destroy (font); + + return CAIRO_STATUS_SUCCESS; + + fail5: + free (truetype_subset->data); + fail4: + free (truetype_subset->widths); + fail3: + if (truetype_subset->font_name) + free (truetype_subset->font_name); + fail2: + free (truetype_subset->ps_name); + fail1: + cairo_truetype_font_destroy (font); + + return status; +} + +void +_cairo_truetype_subset_fini (cairo_truetype_subset_t *subset) +{ + free (subset->ps_name); + if (subset->font_name) + free (subset->font_name); + free (subset->widths); + free (subset->data); + free (subset->string_offsets); +} + +static cairo_int_status_t +_cairo_truetype_reverse_cmap (cairo_scaled_font_t *scaled_font, + unsigned long table_offset, + unsigned long index, + uint32_t *ucs4) +{ + cairo_status_t status; + const cairo_scaled_font_backend_t *backend; + tt_segment_map_t *map; + char buf[4]; + unsigned int num_segments, i; + unsigned long size; + uint16_t *start_code; + uint16_t *end_code; + uint16_t *delta; + uint16_t *range_offset; + uint16_t *glyph_array; + uint16_t c; + + backend = scaled_font->backend; + size = 4; + status = backend->load_truetype_table (scaled_font, + TT_TAG_cmap, table_offset, + (unsigned char *) &buf, + &size); + if (unlikely (status)) + return status; + + /* All table formats have the same first two words */ + map = (tt_segment_map_t *) buf; + if (be16_to_cpu (map->format) != 4) + return CAIRO_INT_STATUS_UNSUPPORTED; + + size = be16_to_cpu (map->length); + map = malloc (size); + if (unlikely (map == NULL)) + return _cairo_error (CAIRO_STATUS_NO_MEMORY); + + status = backend->load_truetype_table (scaled_font, + TT_TAG_cmap, table_offset, + (unsigned char *) map, + &size); + if (unlikely (status)) + goto fail; + + num_segments = be16_to_cpu (map->segCountX2)/2; + + /* A Format 4 cmap contains 8 uint16_t numbers and 4 arrays of + * uint16_t each num_segments long. */ + if (size < (8 + 4*num_segments)*sizeof(uint16_t)) + return CAIRO_INT_STATUS_UNSUPPORTED; + + end_code = map->endCount; + start_code = &(end_code[num_segments + 1]); + delta = &(start_code[num_segments]); + range_offset = &(delta[num_segments]); + glyph_array = &(range_offset[num_segments]); + + /* search for glyph in segments with rangeOffset=0 */ + for (i = 0; i < num_segments; i++) { + c = index - be16_to_cpu (delta[i]); + if (range_offset[i] == 0 && + c >= be16_to_cpu (start_code[i]) && + c <= be16_to_cpu (end_code[i])) + { + *ucs4 = c; + goto found; + } + } + + /* search for glyph in segments with rangeOffset=1 */ + for (i = 0; i < num_segments; i++) { + if (range_offset[i] != 0) { + uint16_t *glyph_ids = &range_offset[i] + be16_to_cpu (range_offset[i])/2; + int range_size = be16_to_cpu (end_code[i]) - be16_to_cpu (start_code[i]) + 1; + uint16_t g_id_be = cpu_to_be16 (index); + int j; + + if (range_size > 0) { + if ((char*)glyph_ids + 2*range_size > (char*)map + size) + return CAIRO_INT_STATUS_UNSUPPORTED; + + for (j = 0; j < range_size; j++) { + if (glyph_ids[j] == g_id_be) { + *ucs4 = be16_to_cpu (start_code[i]) + j; + goto found; + } + } + } + } + } + + /* glyph not found */ + *ucs4 = -1; + +found: + status = CAIRO_STATUS_SUCCESS; + +fail: + free (map); + + return status; +} + +cairo_int_status_t +_cairo_truetype_index_to_ucs4 (cairo_scaled_font_t *scaled_font, + unsigned long index, + uint32_t *ucs4) +{ + cairo_status_t status = CAIRO_INT_STATUS_UNSUPPORTED; + const cairo_scaled_font_backend_t *backend; + tt_cmap_t *cmap; + char buf[4]; + int num_tables, i; + unsigned long size; + + backend = scaled_font->backend; + if (!backend->load_truetype_table) + return CAIRO_INT_STATUS_UNSUPPORTED; + + size = 4; + status = backend->load_truetype_table (scaled_font, + TT_TAG_cmap, 0, + (unsigned char *) &buf, + &size); + if (unlikely (status)) + return status; + + cmap = (tt_cmap_t *) buf; + num_tables = be16_to_cpu (cmap->num_tables); + size = 4 + num_tables*sizeof(tt_cmap_index_t); + cmap = _cairo_malloc_ab_plus_c (num_tables, sizeof (tt_cmap_index_t), 4); + if (unlikely (cmap == NULL)) + return _cairo_error (CAIRO_STATUS_NO_MEMORY); + + status = backend->load_truetype_table (scaled_font, + TT_TAG_cmap, 0, + (unsigned char *) cmap, + &size); + if (unlikely (status)) + goto cleanup; + + /* Find a table with Unicode mapping */ + for (i = 0; i < num_tables; i++) { + if (be16_to_cpu (cmap->index[i].platform) == 3 && + be16_to_cpu (cmap->index[i].encoding) == 1) { + status = _cairo_truetype_reverse_cmap (scaled_font, + be32_to_cpu (cmap->index[i].offset), + index, + ucs4); + if (status != CAIRO_INT_STATUS_UNSUPPORTED) + break; + } + } + +cleanup: + free (cmap); + + return status; +} + +cairo_int_status_t +_cairo_truetype_read_font_name (cairo_scaled_font_t *scaled_font, + char **ps_name_out, + char **font_name_out) +{ + cairo_status_t status; + const cairo_scaled_font_backend_t *backend; + tt_name_t *name; + tt_name_record_t *record; + unsigned long size; + int i, j; + char *ps_name = NULL; + char *font_name = NULL; + + backend = scaled_font->backend; + if (!backend->load_truetype_table) + return CAIRO_INT_STATUS_UNSUPPORTED; + + size = 0; + status = backend->load_truetype_table (scaled_font, + TT_TAG_name, 0, + NULL, + &size); + if (status) + return status; + + name = malloc (size); + if (name == NULL) + return _cairo_error (CAIRO_STATUS_NO_MEMORY); + + status = backend->load_truetype_table (scaled_font, + TT_TAG_name, 0, + (unsigned char *) name, + &size); + if (status) + goto fail; + + /* Extract the font name and PS name from the name table. At + * present this just looks for the Mac platform/Roman encoded font + * name. It should be extended to use any suitable font name in + * the name table. + */ + for (i = 0; i < be16_to_cpu(name->num_records); i++) { + record = &(name->records[i]); + if ((be16_to_cpu (record->platform) == 1) && + (be16_to_cpu (record->encoding) == 0)) { + + if (be16_to_cpu (record->name) == 4) { + font_name = malloc (be16_to_cpu(record->length) + 1); + if (font_name == NULL) { + status = _cairo_error (CAIRO_STATUS_NO_MEMORY); + goto fail; + } + strncpy(font_name, + ((char*)name) + be16_to_cpu (name->strings_offset) + be16_to_cpu (record->offset), + be16_to_cpu (record->length)); + font_name[be16_to_cpu (record->length)] = 0; + } + + if (be16_to_cpu (record->name) == 6) { + ps_name = malloc (be16_to_cpu(record->length) + 1); + if (ps_name == NULL) { + status = _cairo_error (CAIRO_STATUS_NO_MEMORY); + goto fail; + } + strncpy(ps_name, + ((char*)name) + be16_to_cpu (name->strings_offset) + be16_to_cpu (record->offset), + be16_to_cpu (record->length)); + ps_name[be16_to_cpu (record->length)] = 0; + } + + if (font_name && ps_name) + break; + } + } + + free (name); + + /* Ensure PS name does not contain any spaces */ + if (ps_name) { + for (i = 0, j = 0; ps_name[j]; j++) { + if (ps_name[j] == ' ') + continue; + ps_name[i++] = ps_name[j]; + } + ps_name[i] = '\0'; + } + + *ps_name_out = ps_name; + *font_name_out = font_name; + + return CAIRO_STATUS_SUCCESS; + +fail: + free (name); + + if (ps_name != NULL) + free (ps_name); + + if (font_name != NULL) + free (font_name); + + *ps_name_out = NULL; + *font_name_out = NULL; + + return status; +} + +#endif /* CAIRO_HAS_FONT_SUBSET */ diff --git a/programs/develop/libraries/cairo/src/cairo-type1-fallback.c b/programs/develop/libraries/cairo/src/cairo-type1-fallback.c new file mode 100644 index 0000000000..ef25fb62f7 --- /dev/null +++ b/programs/develop/libraries/cairo/src/cairo-type1-fallback.c @@ -0,0 +1,887 @@ +/* cairo - a vector graphics library with display and print output + * + * Copyright © 2006 Red Hat, Inc + * + * This library is free software; you can redistribute it and/or + * modify it either under the terms of the GNU Lesser General Public + * License version 2.1 as published by the Free Software Foundation + * (the "LGPL") or, at your option, under the terms of the Mozilla + * Public License Version 1.1 (the "MPL"). If you do not alter this + * notice, a recipient may use your version of this file under either + * the MPL or the LGPL. + * + * You should have received a copy of the LGPL along with this library + * in the file COPYING-LGPL-2.1; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA + * You should have received a copy of the MPL along with this library + * in the file COPYING-MPL-1.1 + * + * The contents of this file are subject to the Mozilla Public License + * Version 1.1 (the "License"); you may not use this file except in + * compliance with the License. You may obtain a copy of the License at + * http://www.mozilla.org/MPL/ + * + * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY + * OF ANY KIND, either express or implied. See the LGPL or the MPL for + * the specific language governing rights and limitations. + * + * The Original Code is the cairo graphics library. + * + * The Initial Developer of the Original Code is Red Hat, Inc. + * + * Contributor(s): + * Adrian Johnson + */ + +#define _BSD_SOURCE /* for snprintf(), strdup() */ +#include "cairoint.h" +#include "cairo-error-private.h" + +#if CAIRO_HAS_FONT_SUBSET + +#include "cairo-type1-private.h" +#include "cairo-scaled-font-subsets-private.h" +#include "cairo-path-fixed-private.h" +#include "cairo-output-stream-private.h" + +typedef enum { + CAIRO_CHARSTRING_TYPE1, + CAIRO_CHARSTRING_TYPE2 +} cairo_charstring_type_t; + +typedef struct _cairo_type1_font { + int *widths; + + cairo_scaled_font_subset_t *scaled_font_subset; + cairo_scaled_font_t *type1_scaled_font; + + cairo_array_t contents; + + double x_min, y_min, x_max, y_max; + + const char *data; + unsigned long header_size; + unsigned long data_size; + unsigned long trailer_size; + int bbox_position; + int bbox_max_chars; + + cairo_output_stream_t *output; + + unsigned short eexec_key; + cairo_bool_t hex_encode; + int hex_column; +} cairo_type1_font_t; + +static cairo_status_t +cairo_type1_font_create (cairo_scaled_font_subset_t *scaled_font_subset, + cairo_type1_font_t **subset_return, + cairo_bool_t hex_encode) +{ + cairo_type1_font_t *font; + cairo_font_face_t *font_face; + cairo_matrix_t font_matrix; + cairo_matrix_t ctm; + cairo_font_options_t font_options; + cairo_status_t status; + + font = calloc (1, sizeof (cairo_type1_font_t)); + if (unlikely (font == NULL)) + return _cairo_error (CAIRO_STATUS_NO_MEMORY); + + font->widths = calloc (scaled_font_subset->num_glyphs, sizeof (int)); + if (unlikely (font->widths == NULL)) { + free (font); + return _cairo_error (CAIRO_STATUS_NO_MEMORY); + } + + font->scaled_font_subset = scaled_font_subset; + font->hex_encode = hex_encode; + + font_face = cairo_scaled_font_get_font_face (scaled_font_subset->scaled_font); + + cairo_matrix_init_scale (&font_matrix, 1000, -1000); + cairo_matrix_init_identity (&ctm); + + _cairo_font_options_init_default (&font_options); + cairo_font_options_set_hint_style (&font_options, CAIRO_HINT_STYLE_NONE); + cairo_font_options_set_hint_metrics (&font_options, CAIRO_HINT_METRICS_OFF); + + font->type1_scaled_font = cairo_scaled_font_create (font_face, + &font_matrix, + &ctm, + &font_options); + status = font->type1_scaled_font->status; + if (unlikely (status)) + goto fail; + + _cairo_array_init (&font->contents, sizeof (unsigned char)); + font->output = NULL; + + *subset_return = font; + + return CAIRO_STATUS_SUCCESS; + +fail: + free (font->widths); + free (font); + + return status; +} + +/* Charstring commands. If the high byte is 0 the command is encoded + * with a single byte. */ +#define CHARSTRING_sbw 0x0c07 +#define CHARSTRING_rmoveto 0x0015 +#define CHARSTRING_rlineto 0x0005 +#define CHARSTRING_rcurveto 0x0008 +#define CHARSTRING_closepath 0x0009 +#define CHARSTRING_endchar 0x000e + +/* Before calling this function, the caller must allocate sufficient + * space in data (see _cairo_array_grow_by). The maximum number of + * bytes that will be used is 2. + */ +static void +charstring_encode_command (cairo_array_t *data, int command) +{ + cairo_status_t status; + int orig_size; + unsigned char buf[5]; + unsigned char *p = buf; + + if (command & 0xff00) + *p++ = command >> 8; + *p++ = command & 0x00ff; + + /* Ensure the array doesn't grow, which allows this function to + * have no possibility of failure. */ + orig_size = _cairo_array_size (data); + status = _cairo_array_append_multiple (data, buf, p - buf); + + assert (status == CAIRO_STATUS_SUCCESS); + assert (_cairo_array_size (data) == orig_size); +} + +/* Before calling this function, the caller must allocate sufficient + * space in data (see _cairo_array_grow_by). The maximum number of + * bytes that will be used is 5. + */ +static void +charstring_encode_integer (cairo_array_t *data, + int i, + cairo_charstring_type_t type) +{ + cairo_status_t status; + int orig_size; + unsigned char buf[10]; + unsigned char *p = buf; + + if (i >= -107 && i <= 107) { + *p++ = i + 139; + } else if (i >= 108 && i <= 1131) { + i -= 108; + *p++ = (i >> 8)+ 247; + *p++ = i & 0xff; + } else if (i >= -1131 && i <= -108) { + i = -i - 108; + *p++ = (i >> 8)+ 251; + *p++ = i & 0xff; + } else { + if (type == CAIRO_CHARSTRING_TYPE1) { + *p++ = 0xff; + *p++ = i >> 24; + *p++ = (i >> 16) & 0xff; + *p++ = (i >> 8) & 0xff; + *p++ = i & 0xff; + } else { + *p++ = 0xff; + *p++ = (i >> 8) & 0xff; + *p++ = i & 0xff; + *p++ = 0; + *p++ = 0; + } + } + + /* Ensure the array doesn't grow, which allows this function to + * have no possibility of failure. */ + orig_size = _cairo_array_size (data); + status = _cairo_array_append_multiple (data, buf, p - buf); + + assert (status == CAIRO_STATUS_SUCCESS); + assert (_cairo_array_size (data) == orig_size); +} + +typedef struct _ps_path_info { + cairo_array_t *data; + int current_x, current_y; + cairo_charstring_type_t type; +} t1_path_info_t; + +static cairo_status_t +_charstring_move_to (void *closure, + const cairo_point_t *point) +{ + t1_path_info_t *path_info = (t1_path_info_t *) closure; + int dx, dy; + cairo_status_t status; + + status = _cairo_array_grow_by (path_info->data, 12); + if (unlikely (status)) + return status; + + dx = _cairo_fixed_integer_part (point->x) - path_info->current_x; + dy = _cairo_fixed_integer_part (point->y) - path_info->current_y; + charstring_encode_integer (path_info->data, dx, path_info->type); + charstring_encode_integer (path_info->data, dy, path_info->type); + path_info->current_x += dx; + path_info->current_y += dy; + + charstring_encode_command (path_info->data, CHARSTRING_rmoveto); + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_status_t +_charstring_line_to (void *closure, + const cairo_point_t *point) +{ + t1_path_info_t *path_info = (t1_path_info_t *) closure; + int dx, dy; + cairo_status_t status; + + status = _cairo_array_grow_by (path_info->data, 12); + if (unlikely (status)) + return status; + + dx = _cairo_fixed_integer_part (point->x) - path_info->current_x; + dy = _cairo_fixed_integer_part (point->y) - path_info->current_y; + charstring_encode_integer (path_info->data, dx, path_info->type); + charstring_encode_integer (path_info->data, dy, path_info->type); + path_info->current_x += dx; + path_info->current_y += dy; + + charstring_encode_command (path_info->data, CHARSTRING_rlineto); + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_status_t +_charstring_curve_to (void *closure, + const cairo_point_t *point1, + const cairo_point_t *point2, + const cairo_point_t *point3) +{ + t1_path_info_t *path_info = (t1_path_info_t *) closure; + int dx1, dy1, dx2, dy2, dx3, dy3; + cairo_status_t status; + + status = _cairo_array_grow_by (path_info->data, 32); + if (unlikely (status)) + return status; + + dx1 = _cairo_fixed_integer_part (point1->x) - path_info->current_x; + dy1 = _cairo_fixed_integer_part (point1->y) - path_info->current_y; + dx2 = _cairo_fixed_integer_part (point2->x) - path_info->current_x - dx1; + dy2 = _cairo_fixed_integer_part (point2->y) - path_info->current_y - dy1; + dx3 = _cairo_fixed_integer_part (point3->x) - path_info->current_x - dx1 - dx2; + dy3 = _cairo_fixed_integer_part (point3->y) - path_info->current_y - dy1 - dy2; + charstring_encode_integer (path_info->data, dx1, path_info->type); + charstring_encode_integer (path_info->data, dy1, path_info->type); + charstring_encode_integer (path_info->data, dx2, path_info->type); + charstring_encode_integer (path_info->data, dy2, path_info->type); + charstring_encode_integer (path_info->data, dx3, path_info->type); + charstring_encode_integer (path_info->data, dy3, path_info->type); + path_info->current_x += dx1 + dx2 + dx3; + path_info->current_y += dy1 + dy2 + dy3; + charstring_encode_command (path_info->data, CHARSTRING_rcurveto); + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_status_t +_charstring_close_path (void *closure) +{ + cairo_status_t status; + t1_path_info_t *path_info = (t1_path_info_t *) closure; + + if (path_info->type == CAIRO_CHARSTRING_TYPE2) + return CAIRO_STATUS_SUCCESS; + + status = _cairo_array_grow_by (path_info->data, 2); + if (unlikely (status)) + return status; + + charstring_encode_command (path_info->data, CHARSTRING_closepath); + + return CAIRO_STATUS_SUCCESS; +} + +static void +charstring_encrypt (cairo_array_t *data) +{ + unsigned char *d, *end; + uint16_t c, p, r; + + r = CAIRO_TYPE1_CHARSTRING_KEY; + d = (unsigned char *) _cairo_array_index (data, 0); + end = d + _cairo_array_num_elements (data); + while (d < end) { + p = *d; + c = p ^ (r >> 8); + r = (c + r) * CAIRO_TYPE1_ENCRYPT_C1 + CAIRO_TYPE1_ENCRYPT_C2; + *d++ = c; + } +} + +static cairo_int_status_t +cairo_type1_font_create_charstring (cairo_type1_font_t *font, + int subset_index, + int glyph_index, + cairo_charstring_type_t type, + cairo_array_t *data) +{ + cairo_int_status_t status; + cairo_scaled_glyph_t *scaled_glyph; + t1_path_info_t path_info; + cairo_text_extents_t *metrics; + cairo_bool_t emit_path = TRUE; + + /* This call may return CAIRO_INT_STATUS_UNSUPPORTED for bitmap fonts. */ + status = _cairo_scaled_glyph_lookup (font->type1_scaled_font, + glyph_index, + CAIRO_SCALED_GLYPH_INFO_METRICS| + CAIRO_SCALED_GLYPH_INFO_PATH, + &scaled_glyph); + + /* It is ok for the .notdef glyph to not have a path available. We + * just need the metrics to emit an empty glyph. */ + if (glyph_index == 0 && status == CAIRO_INT_STATUS_UNSUPPORTED) { + emit_path = FALSE; + status = _cairo_scaled_glyph_lookup (font->type1_scaled_font, + glyph_index, + CAIRO_SCALED_GLYPH_INFO_METRICS, + &scaled_glyph); + } + if (unlikely (status)) + return status; + + metrics = &scaled_glyph->metrics; + if (subset_index == 0) { + font->x_min = metrics->x_bearing; + font->y_min = metrics->y_bearing; + font->x_max = metrics->x_bearing + metrics->width; + font->y_max = metrics->y_bearing + metrics->height; + } else { + if (metrics->x_bearing < font->x_min) + font->x_min = metrics->x_bearing; + if (metrics->y_bearing < font->y_min) + font->y_min = metrics->y_bearing; + if (metrics->x_bearing + metrics->width > font->x_max) + font->x_max = metrics->x_bearing + metrics->width; + if (metrics->y_bearing + metrics->height > font->y_max) + font->y_max = metrics->y_bearing + metrics->height; + } + font->widths[subset_index] = metrics->x_advance; + + status = _cairo_array_grow_by (data, 30); + if (unlikely (status)) + return status; + + if (type == CAIRO_CHARSTRING_TYPE1) { + charstring_encode_integer (data, (int) scaled_glyph->metrics.x_bearing, type); + charstring_encode_integer (data, (int) scaled_glyph->metrics.y_bearing, type); + charstring_encode_integer (data, (int) scaled_glyph->metrics.x_advance, type); + charstring_encode_integer (data, (int) scaled_glyph->metrics.y_advance, type); + charstring_encode_command (data, CHARSTRING_sbw); + + path_info.current_x = (int) scaled_glyph->metrics.x_bearing; + path_info.current_y = (int) scaled_glyph->metrics.y_bearing; + } else { + charstring_encode_integer (data, (int) scaled_glyph->metrics.x_advance, type); + + path_info.current_x = 0; + path_info.current_y = 0; + } + path_info.data = data; + path_info.type = type; + if (emit_path) { + status = _cairo_path_fixed_interpret (scaled_glyph->path, + CAIRO_DIRECTION_FORWARD, + _charstring_move_to, + _charstring_line_to, + _charstring_curve_to, + _charstring_close_path, + &path_info); + if (unlikely (status)) + return status; + } + + status = _cairo_array_grow_by (data, 1); + if (unlikely (status)) + return status; + charstring_encode_command (path_info.data, CHARSTRING_endchar); + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_int_status_t +cairo_type1_font_write_charstrings (cairo_type1_font_t *font, + cairo_output_stream_t *encrypted_output) +{ + cairo_status_t status; + unsigned char zeros[] = { 0, 0, 0, 0 }; + cairo_array_t data; + unsigned int i; + int length; + + _cairo_array_init (&data, sizeof (unsigned char)); + status = _cairo_array_grow_by (&data, 1024); + if (unlikely (status)) + goto fail; + + _cairo_output_stream_printf (encrypted_output, + "2 index /CharStrings %d dict dup begin\n", + font->scaled_font_subset->num_glyphs + 1); + + _cairo_scaled_font_freeze_cache (font->type1_scaled_font); + for (i = 0; i < font->scaled_font_subset->num_glyphs; i++) { + _cairo_array_truncate (&data, 0); + /* four "random" bytes required by encryption algorithm */ + status = _cairo_array_append_multiple (&data, zeros, 4); + if (unlikely (status)) + break; + + status = cairo_type1_font_create_charstring (font, i, + font->scaled_font_subset->glyphs[i], + CAIRO_CHARSTRING_TYPE1, + &data); + if (unlikely (status)) + break; + + charstring_encrypt (&data); + length = _cairo_array_num_elements (&data); + if (font->scaled_font_subset->glyph_names != NULL) { + _cairo_output_stream_printf (encrypted_output, "/%s %d RD ", + font->scaled_font_subset->glyph_names[i], + length); + } else if (i == 0) { + _cairo_output_stream_printf (encrypted_output, "/.notdef %d RD ", length); + } else { + _cairo_output_stream_printf (encrypted_output, "/g%d %d RD ", i, length); + } + _cairo_output_stream_write (encrypted_output, + _cairo_array_index (&data, 0), + length); + _cairo_output_stream_printf (encrypted_output, " ND\n"); + } + _cairo_scaled_font_thaw_cache (font->type1_scaled_font); + +fail: + _cairo_array_fini (&data); + return status; +} + +static void +cairo_type1_font_write_header (cairo_type1_font_t *font, + const char *name) +{ + unsigned int i; + const char spaces[50] = " "; + + _cairo_output_stream_printf (font->output, + "%%!FontType1-1.1 %s 1.0\n" + "11 dict begin\n" + "/FontName /%s def\n" + "/PaintType 0 def\n" + "/FontType 1 def\n" + "/FontMatrix [0.001 0 0 0.001 0 0] readonly def\n", + name, + name); + + /* We don't know the bbox values until after the charstrings have + * been generated. Reserve some space and fill in the bbox + * later. */ + + /* Worst case for four signed ints with spaces between each number */ + font->bbox_max_chars = 50; + + _cairo_output_stream_printf (font->output, "/FontBBox {"); + font->bbox_position = _cairo_output_stream_get_position (font->output); + _cairo_output_stream_write (font->output, spaces, font->bbox_max_chars); + + _cairo_output_stream_printf (font->output, + "} readonly def\n" + "/Encoding 256 array\n" + "0 1 255 {1 index exch /.notdef put} for\n"); + for (i = 1; i < font->scaled_font_subset->num_glyphs; i++) { + if (font->scaled_font_subset->glyph_names != NULL) { + _cairo_output_stream_printf (font->output, "dup %d /%s put\n", + i, font->scaled_font_subset->glyph_names[i]); + } else { + _cairo_output_stream_printf (font->output, "dup %d /g%d put\n", i, i); + } + } + _cairo_output_stream_printf (font->output, + "readonly def\n" + "currentdict end\n" + "currentfile eexec\n"); +} + +static cairo_status_t +cairo_type1_write_stream_encrypted (void *closure, + const unsigned char *data, + unsigned int length) +{ + const unsigned char *in, *end; + uint16_t c, p; + static const char hex_digits[16] = "0123456789abcdef"; + char digits[3]; + cairo_type1_font_t *font = closure; + + in = (const unsigned char *) data; + end = (const unsigned char *) data + length; + while (in < end) { + p = *in++; + c = p ^ (font->eexec_key >> 8); + font->eexec_key = (c + font->eexec_key) * CAIRO_TYPE1_ENCRYPT_C1 + CAIRO_TYPE1_ENCRYPT_C2; + + if (font->hex_encode) { + digits[0] = hex_digits[c >> 4]; + digits[1] = hex_digits[c & 0x0f]; + digits[2] = '\n'; + font->hex_column += 2; + + if (font->hex_column == 78) { + _cairo_output_stream_write (font->output, digits, 3); + font->hex_column = 0; + } else { + _cairo_output_stream_write (font->output, digits, 2); + } + } else { + digits[0] = c; + _cairo_output_stream_write (font->output, digits, 1); + } + } + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_int_status_t +cairo_type1_font_write_private_dict (cairo_type1_font_t *font, + const char *name) +{ + cairo_int_status_t status; + cairo_status_t status2; + cairo_output_stream_t *encrypted_output; + + font->eexec_key = CAIRO_TYPE1_PRIVATE_DICT_KEY; + font->hex_column = 0; + encrypted_output = _cairo_output_stream_create ( + cairo_type1_write_stream_encrypted, + NULL, + font); + if (_cairo_output_stream_get_status (encrypted_output)) + return _cairo_output_stream_destroy (encrypted_output); + + /* Note: the first four spaces at the start of this private dict + * are the four "random" bytes of plaintext required by the + * encryption algorithm */ + _cairo_output_stream_printf (encrypted_output, + " dup /Private 9 dict dup begin\n" + "/RD {string currentfile exch readstring pop}" + " bind executeonly def\n" + "/ND {noaccess def} executeonly def\n" + "/NP {noaccess put} executeonly def\n" + "/BlueValues [] def\n" + "/MinFeature {16 16} def\n" + "/lenIV 4 def\n" + "/password 5839 def\n"); + + status = cairo_type1_font_write_charstrings (font, encrypted_output); + if (unlikely (status)) + goto fail; + + _cairo_output_stream_printf (encrypted_output, + "end\n" + "end\n" + "readonly put\n" + "noaccess put\n" + "dup /FontName get exch definefont pop\n" + "mark currentfile closefile\n"); + + fail: + status2 = _cairo_output_stream_destroy (encrypted_output); + if (status == CAIRO_STATUS_SUCCESS) + status = status2; + + return status; +} + +static void +cairo_type1_font_write_trailer(cairo_type1_font_t *font) +{ + int i; + static const char zeros[65] = + "0000000000000000000000000000000000000000000000000000000000000000\n"; + + for (i = 0; i < 8; i++) + _cairo_output_stream_write (font->output, zeros, sizeof zeros); + + _cairo_output_stream_printf (font->output, "cleartomark\n"); +} + +static cairo_status_t +cairo_type1_write_stream (void *closure, + const unsigned char *data, + unsigned int length) +{ + cairo_type1_font_t *font = closure; + + return _cairo_array_append_multiple (&font->contents, data, length); +} + +static cairo_int_status_t +cairo_type1_font_write (cairo_type1_font_t *font, + const char *name) +{ + cairo_int_status_t status; + + cairo_type1_font_write_header (font, name); + font->header_size = _cairo_output_stream_get_position (font->output); + + status = cairo_type1_font_write_private_dict (font, name); + if (unlikely (status)) + return status; + + font->data_size = _cairo_output_stream_get_position (font->output) - + font->header_size; + + cairo_type1_font_write_trailer (font); + font->trailer_size = + _cairo_output_stream_get_position (font->output) - + font->header_size - font->data_size; + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_int_status_t +cairo_type1_font_generate (cairo_type1_font_t *font, const char *name) +{ + cairo_int_status_t status; + + status = _cairo_array_grow_by (&font->contents, 4096); + if (unlikely (status)) + return status; + + font->output = _cairo_output_stream_create (cairo_type1_write_stream, NULL, font); + if (_cairo_output_stream_get_status (font->output)) + return _cairo_output_stream_destroy (font->output); + + status = cairo_type1_font_write (font, name); + if (unlikely (status)) + return status; + + font->data = _cairo_array_index (&font->contents, 0); + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_status_t +cairo_type1_font_destroy (cairo_type1_font_t *font) +{ + cairo_status_t status = CAIRO_STATUS_SUCCESS; + + free (font->widths); + cairo_scaled_font_destroy (font->type1_scaled_font); + _cairo_array_fini (&font->contents); + if (font->output) + status = _cairo_output_stream_destroy (font->output); + free (font); + + return status; +} + +static cairo_status_t +_cairo_type1_fallback_init_internal (cairo_type1_subset_t *type1_subset, + const char *name, + cairo_scaled_font_subset_t *scaled_font_subset, + cairo_bool_t hex_encode) +{ + cairo_type1_font_t *font; + cairo_status_t status; + unsigned long length; + unsigned int i, len; + + status = cairo_type1_font_create (scaled_font_subset, &font, hex_encode); + if (unlikely (status)) + return status; + + status = cairo_type1_font_generate (font, name); + if (unlikely (status)) + goto fail1; + + type1_subset->base_font = strdup (name); + if (unlikely (type1_subset->base_font == NULL)) { + status = _cairo_error (CAIRO_STATUS_NO_MEMORY); + goto fail1; + } + + type1_subset->widths = calloc (sizeof (double), font->scaled_font_subset->num_glyphs); + if (unlikely (type1_subset->widths == NULL)) { + status = _cairo_error (CAIRO_STATUS_NO_MEMORY); + goto fail2; + } + for (i = 0; i < font->scaled_font_subset->num_glyphs; i++) + type1_subset->widths[i] = (double)font->widths[i]/1000; + + type1_subset->x_min = (double)font->x_min/1000; + type1_subset->y_min = (double)font->y_min/1000; + type1_subset->x_max = (double)font->x_max/1000; + type1_subset->y_max = (double)font->y_max/1000; + type1_subset->ascent = (double)font->y_max/1000; + type1_subset->descent = (double)font->y_min/1000; + + length = font->header_size + font->data_size + + font->trailer_size; + type1_subset->data = malloc (length); + if (unlikely (type1_subset->data == NULL)) { + status = _cairo_error (CAIRO_STATUS_NO_MEMORY); + goto fail3; + } + memcpy (type1_subset->data, + _cairo_array_index (&font->contents, 0), length); + + len = snprintf(type1_subset->data + font->bbox_position, + font->bbox_max_chars, + "%d %d %d %d", + (int)font->x_min, + (int)font->y_min, + (int)font->x_max, + (int)font->y_max); + type1_subset->data[font->bbox_position + len] = ' '; + + type1_subset->header_length = font->header_size; + type1_subset->data_length = font->data_size; + type1_subset->trailer_length = font->trailer_size; + + return cairo_type1_font_destroy (font); + + fail3: + free (type1_subset->widths); + fail2: + free (type1_subset->base_font); + fail1: + /* status is already set, ignore further errors */ + cairo_type1_font_destroy (font); + + return status; +} + +cairo_status_t +_cairo_type1_fallback_init_binary (cairo_type1_subset_t *type1_subset, + const char *name, + cairo_scaled_font_subset_t *scaled_font_subset) +{ + return _cairo_type1_fallback_init_internal (type1_subset, + name, + scaled_font_subset, FALSE); +} + +cairo_status_t +_cairo_type1_fallback_init_hex (cairo_type1_subset_t *type1_subset, + const char *name, + cairo_scaled_font_subset_t *scaled_font_subset) +{ + return _cairo_type1_fallback_init_internal (type1_subset, + name, + scaled_font_subset, TRUE); +} + +void +_cairo_type1_fallback_fini (cairo_type1_subset_t *subset) +{ + free (subset->base_font); + free (subset->widths); + free (subset->data); +} + +cairo_status_t +_cairo_type2_charstrings_init (cairo_type2_charstrings_t *type2_subset, + cairo_scaled_font_subset_t *scaled_font_subset) +{ + cairo_type1_font_t *font; + cairo_status_t status; + unsigned int i; + cairo_array_t charstring; + + status = cairo_type1_font_create (scaled_font_subset, &font, FALSE); + if (unlikely (status)) + return status; + + _cairo_array_init (&type2_subset->charstrings, sizeof (cairo_array_t)); + + type2_subset->widths = calloc (sizeof (int), font->scaled_font_subset->num_glyphs); + if (unlikely (type2_subset->widths == NULL)) { + status = _cairo_error (CAIRO_STATUS_NO_MEMORY); + goto fail1; + } + + _cairo_scaled_font_freeze_cache (font->type1_scaled_font); + for (i = 0; i < font->scaled_font_subset->num_glyphs; i++) { + _cairo_array_init (&charstring, sizeof (unsigned char)); + status = _cairo_array_grow_by (&charstring, 32); + if (unlikely (status)) + goto fail2; + + status = cairo_type1_font_create_charstring (font, i, + font->scaled_font_subset->glyphs[i], + CAIRO_CHARSTRING_TYPE2, + &charstring); + if (unlikely (status)) + goto fail2; + + status = _cairo_array_append (&type2_subset->charstrings, &charstring); + if (unlikely (status)) + goto fail2; + } + _cairo_scaled_font_thaw_cache (font->type1_scaled_font); + + for (i = 0; i < font->scaled_font_subset->num_glyphs; i++) + type2_subset->widths[i] = font->widths[i]; + + type2_subset->x_min = (int) font->x_min; + type2_subset->y_min = (int) font->y_min; + type2_subset->x_max = (int) font->x_max; + type2_subset->y_max = (int) font->y_max; + type2_subset->ascent = (int) font->y_max; + type2_subset->descent = (int) font->y_min; + + return cairo_type1_font_destroy (font); + +fail2: + _cairo_scaled_font_thaw_cache (font->type1_scaled_font); + _cairo_array_fini (&charstring); + _cairo_type2_charstrings_fini (type2_subset); +fail1: + cairo_type1_font_destroy (font); + return status; +} + +void +_cairo_type2_charstrings_fini (cairo_type2_charstrings_t *type2_subset) +{ + unsigned int i, num_charstrings; + cairo_array_t *charstring; + + num_charstrings = _cairo_array_num_elements (&type2_subset->charstrings); + for (i = 0; i < num_charstrings; i++) { + charstring = _cairo_array_index (&type2_subset->charstrings, i); + _cairo_array_fini (charstring); + } + _cairo_array_fini (&type2_subset->charstrings); + + free (type2_subset->widths); +} + +#endif /* CAIRO_HAS_FONT_SUBSET */ diff --git a/programs/develop/libraries/cairo/src/cairo-type1-subset.c b/programs/develop/libraries/cairo/src/cairo-type1-subset.c new file mode 100644 index 0000000000..965069984e --- /dev/null +++ b/programs/develop/libraries/cairo/src/cairo-type1-subset.c @@ -0,0 +1,1431 @@ +/* cairo - a vector graphics library with display and print output + * + * Copyright © 2006 Red Hat, Inc + * + * This library is free software; you can redistribute it and/or + * modify it either under the terms of the GNU Lesser General Public + * License version 2.1 as published by the Free Software Foundation + * (the "LGPL") or, at your option, under the terms of the Mozilla + * Public License Version 1.1 (the "MPL"). If you do not alter this + * notice, a recipient may use your version of this file under either + * the MPL or the LGPL. + * + * You should have received a copy of the LGPL along with this library + * in the file COPYING-LGPL-2.1; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA + * You should have received a copy of the MPL along with this library + * in the file COPYING-MPL-1.1 + * + * The contents of this file are subject to the Mozilla Public License + * Version 1.1 (the "License"); you may not use this file except in + * compliance with the License. You may obtain a copy of the License at + * http://www.mozilla.org/MPL/ + * + * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY + * OF ANY KIND, either express or implied. See the LGPL or the MPL for + * the specific language governing rights and limitations. + * + * The Original Code is the cairo graphics library. + * + * The Initial Developer of the Original Code is Red Hat, Inc. + * + * Contributor(s): + * Kristian Høgsberg + */ + +/* + * Useful links: + * http://partners.adobe.com/public/developer/en/font/T1_SPEC.PDF + */ + + +#define _BSD_SOURCE /* for snprintf(), strdup() */ +#include "cairoint.h" +#include "cairo-error-private.h" + +#if CAIRO_HAS_FONT_SUBSET + +#include "cairo-type1-private.h" +#include "cairo-scaled-font-subsets-private.h" +#include "cairo-output-stream-private.h" + +/* XXX: Eventually, we need to handle other font backends */ +#if CAIRO_HAS_FT_FONT + +#include "cairo-ft-private.h" + +#include +#include FT_FREETYPE_H +#include FT_OUTLINE_H +#include FT_TYPE1_TABLES_H + +#include + +typedef struct _cairo_type1_font_subset { + cairo_scaled_font_subset_t *scaled_font_subset; + + struct { + cairo_unscaled_font_t *unscaled_font; + unsigned int font_id; + char *base_font; + unsigned int num_glyphs; + double x_min, y_min, x_max, y_max; + double ascent, descent; + + const char *data; + unsigned long header_size; + unsigned long data_size; + unsigned long trailer_size; + } base; + + FT_Face face; + int num_glyphs; + + struct { + int subset_index; + double width; + char *name; + } *glyphs; + + cairo_output_stream_t *output; + cairo_array_t contents; + + const char *rd, *nd; + + char *type1_data; + unsigned int type1_length; + char *type1_end; + + char *header_segment; + int header_segment_size; + char *eexec_segment; + int eexec_segment_size; + cairo_bool_t eexec_segment_is_ascii; + + char *cleartext; + char *cleartext_end; + + int header_size; + + unsigned short eexec_key; + cairo_bool_t hex_encode; + int hex_column; +} cairo_type1_font_subset_t; + + +static cairo_status_t +_cairo_type1_font_subset_init (cairo_type1_font_subset_t *font, + cairo_unscaled_font_t *unscaled_font, + cairo_bool_t hex_encode) +{ + cairo_ft_unscaled_font_t *ft_unscaled_font; + cairo_status_t status; + FT_Face face; + PS_FontInfoRec font_info; + int i, j; + + ft_unscaled_font = (cairo_ft_unscaled_font_t *) unscaled_font; + + face = _cairo_ft_unscaled_font_lock_face (ft_unscaled_font); + if (unlikely (face == NULL)) + return _cairo_error (CAIRO_STATUS_NO_MEMORY); + + if (FT_Get_PS_Font_Info(face, &font_info) != 0) { + status = CAIRO_INT_STATUS_UNSUPPORTED; + goto fail1; + } + + /* OpenType/CFF fonts also have a PS_FontInfoRec */ +#if HAVE_FT_LOAD_SFNT_TABLE + if (FT_IS_SFNT (face)) { + status = CAIRO_INT_STATUS_UNSUPPORTED; + goto fail1; + } +#endif + + memset (font, 0, sizeof (*font)); + font->base.unscaled_font = _cairo_unscaled_font_reference (unscaled_font); + font->base.num_glyphs = face->num_glyphs; + font->base.x_min = face->bbox.xMin / (double)face->units_per_EM; + font->base.y_min = face->bbox.yMin / (double)face->units_per_EM; + font->base.x_max = face->bbox.xMax / (double)face->units_per_EM; + font->base.y_max = face->bbox.yMax / (double)face->units_per_EM; + font->base.ascent = face->ascender / (double)face->units_per_EM; + font->base.descent = face->descender / (double)face->units_per_EM; + + if (face->family_name) { + font->base.base_font = strdup (face->family_name); + if (unlikely (font->base.base_font == NULL)) { + status = _cairo_error (CAIRO_STATUS_NO_MEMORY); + goto fail2; + } + for (i = 0, j = 0; font->base.base_font[j]; j++) { + if (font->base.base_font[j] == ' ') + continue; + font->base.base_font[i++] = font->base.base_font[j]; + } + font->base.base_font[i] = '\0'; + } + + font->glyphs = calloc (face->num_glyphs, sizeof font->glyphs[0]); + if (unlikely (font->glyphs == NULL)) { + status = _cairo_error (CAIRO_STATUS_NO_MEMORY); + goto fail3; + } + + font->hex_encode = hex_encode; + font->num_glyphs = 0; + for (i = 0; i < face->num_glyphs; i++) + font->glyphs[i].subset_index = -1; + + _cairo_array_init (&font->contents, sizeof (char)); + + _cairo_ft_unscaled_font_unlock_face (ft_unscaled_font); + + return CAIRO_STATUS_SUCCESS; + + fail3: + if (font->base.base_font) + free (font->base.base_font); + fail2: + _cairo_unscaled_font_destroy (unscaled_font); + fail1: + _cairo_ft_unscaled_font_unlock_face (ft_unscaled_font); + + return status; +} + +static void +cairo_type1_font_subset_use_glyph (cairo_type1_font_subset_t *font, int glyph) +{ + if (font->glyphs[glyph].subset_index >= 0) + return; + + font->glyphs[glyph].subset_index = font->num_glyphs++; +} + +static cairo_bool_t +is_ps_delimiter(int c) +{ + static const char delimiters[] = "()[]{}<>/% \t\r\n"; + + return strchr (delimiters, c) != NULL; +} + +static const char * +find_token (const char *buffer, const char *end, const char *token) +{ + int i, length; + /* FIXME: find substring really must be find_token */ + + if (buffer == NULL) + return NULL; + + length = strlen (token); + for (i = 0; buffer + i < end - length + 1; i++) + if (memcmp (buffer + i, token, length) == 0) + if ((i == 0 || token[0] == '/' || is_ps_delimiter(buffer[i - 1])) && + (buffer + i == end - length || is_ps_delimiter(buffer[i + length]))) + return buffer + i; + + return NULL; +} + +static cairo_status_t +cairo_type1_font_subset_find_segments (cairo_type1_font_subset_t *font) +{ + unsigned char *p; + const char *eexec_token; + int size, i; + + p = (unsigned char *) font->type1_data; + font->type1_end = font->type1_data + font->type1_length; + if (p[0] == 0x80 && p[1] == 0x01) { + font->header_segment_size = + p[2] | (p[3] << 8) | (p[4] << 16) | (p[5] << 24); + font->header_segment = (char *) p + 6; + + p += 6 + font->header_segment_size; + font->eexec_segment_size = + p[2] | (p[3] << 8) | (p[4] << 16) | (p[5] << 24); + font->eexec_segment = (char *) p + 6; + font->eexec_segment_is_ascii = (p[1] == 1); + + p += 6 + font->eexec_segment_size; + while (p < (unsigned char *) (font->type1_end) && p[1] != 0x03) { + size = p[2] | (p[3] << 8) | (p[4] << 16) | (p[5] << 24); + p += 6 + size; + } + font->type1_end = (char *) p; + } else { + eexec_token = find_token ((char *) p, font->type1_end, "eexec"); + if (eexec_token == NULL) + return CAIRO_INT_STATUS_UNSUPPORTED; + + font->header_segment_size = eexec_token - (char *) p + strlen ("eexec\n"); + font->header_segment = (char *) p; + font->eexec_segment_size = font->type1_length - font->header_segment_size; + font->eexec_segment = (char *) p + font->header_segment_size; + font->eexec_segment_is_ascii = TRUE; + for (i = 0; i < 4; i++) { + if (!isxdigit(font->eexec_segment[i])) + font->eexec_segment_is_ascii = FALSE; + } + } + + return CAIRO_STATUS_SUCCESS; +} + +/* Search for the definition of key and erase it by overwriting with spaces. + * This function is looks for definitions of the form: + * + * /key1 1234 def + * /key2 [12 34 56] def + * + * ie a key defined as an integer or array of integers. + * + */ +static void +cairo_type1_font_erase_dict_key (cairo_type1_font_subset_t *font, + const char *key) +{ + const char *start, *p, *segment_end; + + segment_end = font->header_segment + font->header_segment_size; + + start = font->header_segment; + do { + start = find_token (start, segment_end, key); + if (start) { + p = start + strlen(key); + /* skip integers or array of integers */ + while (p < segment_end && + (_cairo_isspace(*p) || + _cairo_isdigit(*p) || + *p == '[' || + *p == ']')) + { + p++; + } + + if (p + 3 < segment_end && memcmp(p, "def", 3) == 0) { + /* erase definition of the key */ + memset((char *) start, ' ', p + 3 - start); + } + start += strlen(key); + } + } while (start); +} + +static cairo_status_t +cairo_type1_font_subset_write_header (cairo_type1_font_subset_t *font, + const char *name) +{ + const char *start, *end, *segment_end; + unsigned int i; + + /* FIXME: + * This function assumes that /FontName always appears + * before /Encoding. This appears to always be the case with Type1 + * fonts. + * + * The more recently added code for removing the UniqueID and XUID + * keys can not make any assumptions about the position of the + * keys in the dictionary so it is implemented by overwriting the + * key definition with spaces before we start copying the font to + * the output. + * + * This code should be rewritten to not make any assumptions about + * the order of dictionary keys. This will allow UniqueID to be + * stripped out instead of leaving a bunch of spaces in the + * output. + */ + cairo_type1_font_erase_dict_key (font, "/UniqueID"); + cairo_type1_font_erase_dict_key (font, "/XUID"); + + segment_end = font->header_segment + font->header_segment_size; + + /* Type 1 fonts created by Fontforge have some PostScript code at + * the start of the font that skips the font if the printer has a + * cached copy of the font with the same unique id. This breaks + * our subsetted font so we disable it by searching for the + * PostScript operator "known" when used to check for the + * "/UniqueID" dictionary key. We append " pop false " after it to + * pop the result of this check off the stack and replace it with + * "false" to make the PostScript code think "/UniqueID" does not + * exist. + */ + end = font->header_segment; + start = find_token (font->header_segment, segment_end, "/UniqueID"); + if (start) { + start += 9; + while (start < segment_end && _cairo_isspace (*start)) + start++; + if (start + 5 < segment_end && memcmp(start, "known", 5) == 0) { + _cairo_output_stream_write (font->output, font->header_segment, + start + 5 - font->header_segment); + _cairo_output_stream_printf (font->output, " pop false "); + end = start + 5; + } + } + + start = find_token (end, segment_end, "/FontName"); + if (start == NULL) + return CAIRO_INT_STATUS_UNSUPPORTED; + + _cairo_output_stream_write (font->output, end, + start - end); + + _cairo_output_stream_printf (font->output, "/FontName /%s def", name); + + end = find_token (start, segment_end, "def"); + if (end == NULL) + return CAIRO_INT_STATUS_UNSUPPORTED; + end += 3; + + start = find_token (end, segment_end, "/Encoding"); + if (start == NULL) + return CAIRO_INT_STATUS_UNSUPPORTED; + _cairo_output_stream_write (font->output, end, start - end); + + _cairo_output_stream_printf (font->output, + "/Encoding 256 array\n" + "0 1 255 {1 index exch /.notdef put} for\n"); + for (i = 1; i < font->base.num_glyphs; i++) { + if (font->glyphs[i].subset_index < 0) + continue; + _cairo_output_stream_printf (font->output, + "dup %d /%s put\n", + font->glyphs[i].subset_index, + font->glyphs[i].name); + } + _cairo_output_stream_printf (font->output, "readonly def"); + + end = find_token (start, segment_end, "def"); + if (end == NULL) + return CAIRO_INT_STATUS_UNSUPPORTED; + end += 3; + + _cairo_output_stream_write (font->output, end, segment_end - end); + + return font->output->status; +} + +static int +hex_to_int (int ch) +{ + if (ch <= '9') + return ch - '0'; + else if (ch <= 'F') + return ch - 'A' + 10; + else + return ch - 'a' + 10; +} + +static cairo_status_t +cairo_type1_font_subset_write_encrypted (cairo_type1_font_subset_t *font, + const char *data, unsigned int length) +{ + const unsigned char *in, *end; + int c, p; + static const char hex_digits[16] = "0123456789abcdef"; + char digits[3]; + + in = (const unsigned char *) data; + end = (const unsigned char *) data + length; + while (in < end) { + p = *in++; + c = p ^ (font->eexec_key >> 8); + font->eexec_key = (c + font->eexec_key) * CAIRO_TYPE1_ENCRYPT_C1 + CAIRO_TYPE1_ENCRYPT_C2; + + if (font->hex_encode) { + digits[0] = hex_digits[c >> 4]; + digits[1] = hex_digits[c & 0x0f]; + digits[2] = '\n'; + font->hex_column += 2; + + if (font->hex_column == 78) { + _cairo_output_stream_write (font->output, digits, 3); + font->hex_column = 0; + } else { + _cairo_output_stream_write (font->output, digits, 2); + } + } else { + digits[0] = c; + _cairo_output_stream_write (font->output, digits, 1); + } + } + + return font->output->status; +} + +static cairo_status_t +cairo_type1_font_subset_decrypt_eexec_segment (cairo_type1_font_subset_t *font) +{ + unsigned short r = CAIRO_TYPE1_PRIVATE_DICT_KEY; + unsigned char *in, *end; + char *out; + int c, p; + int i; + + in = (unsigned char *) font->eexec_segment; + end = (unsigned char *) in + font->eexec_segment_size; + + font->cleartext = malloc (font->eexec_segment_size); + if (unlikely (font->cleartext == NULL)) + return _cairo_error (CAIRO_STATUS_NO_MEMORY); + + out = font->cleartext; + while (in < end) { + if (font->eexec_segment_is_ascii) { + c = *in++; + if (_cairo_isspace (c)) + continue; + c = (hex_to_int (c) << 4) | hex_to_int (*in++); + } else { + c = *in++; + } + p = c ^ (r >> 8); + r = (c + r) * CAIRO_TYPE1_ENCRYPT_C1 + CAIRO_TYPE1_ENCRYPT_C2; + + *out++ = p; + } + font->cleartext_end = out; + + /* Overwrite random bytes with spaces. + * + * The first 4 bytes of the cleartext are the random bytes + * required by the encryption algorithm. When encrypting the + * cleartext, the first ciphertext byte must not be a white space + * character and the first 4 bytes must not be an ASCII Hex + * character. Some fonts do not check that their randomly chosen + * bytes results in ciphertext that complies with this + * restriction. This may cause problems for some PDF consumers. By + * replacing the random bytes with spaces, the first four bytes of + * ciphertext will always be 0xf9, 0x83, 0xef, 0x00 which complies + * with this restriction. Using spaces also means we don't have to + * skip over the random bytes when parsing the cleartext. + */ + for (i = 0; i < 4 && i < font->eexec_segment_size; i++) + font->cleartext[i] = ' '; + + return CAIRO_STATUS_SUCCESS; +} + +static const char * +skip_token (const char *p, const char *end) +{ + while (p < end && _cairo_isspace(*p)) + p++; + + while (p < end && !_cairo_isspace(*p)) + p++; + + if (p == end) + return NULL; + + return p; +} + +static int +cairo_type1_font_subset_lookup_glyph (cairo_type1_font_subset_t *font, + const char *glyph_name, int length) +{ + unsigned int i; + + for (i = 0; i < font->base.num_glyphs; i++) { + if (font->glyphs[i].name && + strncmp (font->glyphs[i].name, glyph_name, length) == 0 && + font->glyphs[i].name[length] == '\0') + return i; + } + + return -1; +} + +static cairo_status_t +cairo_type1_font_subset_get_glyph_names_and_widths (cairo_type1_font_subset_t *font) +{ + unsigned int i; + char buffer[256]; + FT_Error error; + + /* Get glyph names and width using the freetype API */ + for (i = 0; i < font->base.num_glyphs; i++) { + if (font->glyphs[i].name != NULL) + continue; + + error = FT_Load_Glyph (font->face, i, + FT_LOAD_NO_SCALE | FT_LOAD_NO_HINTING | + FT_LOAD_NO_BITMAP | FT_LOAD_IGNORE_TRANSFORM); + if (error != FT_Err_Ok) { + /* propagate fatal errors from FreeType */ + if (error == FT_Err_Out_Of_Memory) + return _cairo_error (CAIRO_STATUS_NO_MEMORY); + + return CAIRO_INT_STATUS_UNSUPPORTED; + } + + font->glyphs[i].width = font->face->glyph->metrics.horiAdvance / (double)font->face->units_per_EM; + + error = FT_Get_Glyph_Name(font->face, i, buffer, sizeof buffer); + if (error != FT_Err_Ok) { + /* propagate fatal errors from FreeType */ + if (error == FT_Err_Out_Of_Memory) + return _cairo_error (CAIRO_STATUS_NO_MEMORY); + + return CAIRO_INT_STATUS_UNSUPPORTED; + } + + font->glyphs[i].name = strdup (buffer); + if (unlikely (font->glyphs[i].name == NULL)) + return _cairo_error (CAIRO_STATUS_NO_MEMORY); + } + + return CAIRO_STATUS_SUCCESS; +} + +static void +cairo_type1_font_subset_decrypt_charstring (const unsigned char *in, int size, unsigned char *out) +{ + unsigned short r = CAIRO_TYPE1_CHARSTRING_KEY; + int c, p, i; + + for (i = 0; i < size; i++) { + c = *in++; + p = c ^ (r >> 8); + r = (c + r) * CAIRO_TYPE1_ENCRYPT_C1 + CAIRO_TYPE1_ENCRYPT_C2; + *out++ = p; + } +} + +static const unsigned char * +cairo_type1_font_subset_decode_integer (const unsigned char *p, int *integer) +{ + if (*p <= 246) { + *integer = *p++ - 139; + } else if (*p <= 250) { + *integer = (p[0] - 247) * 256 + p[1] + 108; + p += 2; + } else if (*p <= 254) { + *integer = -(p[0] - 251) * 256 - p[1] - 108; + p += 2; + } else { + *integer = (p[1] << 24) | (p[2] << 16) | (p[3] << 8) | p[4]; + p += 5; + } + + return p; +} + +#if 0 +/* + * The two tables that follow are generated using this perl code: + */ + +@encoding = ( + /* 0 */ + NULL, NULL, NULL, NULL, + NULL, NULL, NULL, NULL, + NULL, NULL, NULL, NULL, + NULL, NULL, NULL, NULL, + /* 16 */ + NULL, NULL, NULL, NULL, + NULL, NULL, NULL, NULL, + NULL, NULL, NULL, NULL, + NULL, NULL, NULL, NULL, + /* 32 */ + "space", "exclam", "quotedbl", "numbersign", + "dollar", "percent", "ampersand", "quoteright", + "parenleft", "parenright", "asterisk", "plus", + "comma", "hyphen", "period", "slash", + /* 48 */ + "zero", "one", "two", "three", + "four", "five", "six", "seven", + "eight", "nine", "colon", "semicolon", + "less", "equal", "greater", "question", + /* 64 */ + "at", "A", "B", "C", + "D", "E", "F", "G", + "H", "I", "J", "K", + "L", "M", "N", "O", + /* 80 */ + "P", "Q", "R", "S", + "T", "U", "V", "W", + "X", "Y", "Z", "bracketleft", + "backslash", "bracketright", "asciicircum", "underscore", + /* 96 */ + "quoteleft", "a", "b", "c", + "d", "e", "f", "g", + "h", "i", "j", "k", + "l", "m", "n", "o", + /* 112 */ + "p", "q", "r", "s", + "t", "u", "v", "w", + "x", "y", "z", "braceleft", + "bar", "braceright", "asciitilde", NULL, + /* 128 */ + NULL, NULL, NULL, NULL, + NULL, NULL, NULL, NULL, + NULL, NULL, NULL, NULL, + NULL, NULL, NULL, NULL, + /* 144 */ + NULL, NULL, NULL, NULL, + NULL, NULL, NULL, NULL, + NULL, NULL, NULL, NULL, + NULL, NULL, NULL, NULL, + /* 160 */ + NULL, "exclamdown", "cent", "sterling", + "fraction", "yen", "florin", "section", + "currency", "quotesingle", "quotedblleft", "guillemotleft", + "guilsinglleft","guilsinglright","fi", "fl", + /* 176 */ + NULL, "endash", "dagger", "daggerdbl", + "periodcentered",NULL, "paragraph", "bullet", + "quotesinglbase","quotedblbase","quotedblright","guillemotright", + "ellipsis", "perthousand", NULL, "questiondown", + /* 192 */ + NULL, "grave", "acute", "circumflex", + "tilde", "macron", "breve", "dotaccent", + "dieresis", NULL, "ring", "cedilla", + NULL, "hungarumlaut", "ogonek", "caron", + /* 208 */ + "emdash", NULL, NULL, NULL, + NULL, NULL, NULL, NULL, + NULL, NULL, NULL, NULL, + NULL, NULL, NULL, NULL, + /* 224 */ + NULL, "AE", NULL, "ordfeminine", + NULL, NULL, NULL, NULL, + "Lslash", "Oslash", "OE", "ordmasculine", + NULL, NULL, NULL, NULL, + /* 240 */ + NULL, "ae", NULL, NULL, + NULL, "dotlessi", NULL, NULL, + "lslash", "oslash", "oe", "germandbls", + NULL, NULL, NULL, NULL + ); + +print "static const char ps_standard_encoding_symbol[] = {\n"; +$s = qq( "\\0"); +for $sym (@encoding) { + if (! ($sym eq NULL)) { + $ss = qq( "$sym\\0"); + if (length($s) + length($ss) > 78) { + print qq( $s\n); + $s = ""; + } + $s .= $ss; + } +} +print qq( $s\n); +print "};\n\n"; +print "static const int16_t ps_standard_encoding_offset[256] = {\n"; +$offset = 1; +$s = qq(); +for $sym (@encoding) { + if (! ($sym eq NULL)) { + $ss = qq( $offset/*$sym*/,); + $offset += length($sym) + 1; + } else { + $ss = qq( 0,); + } + if (length($s) + length($ss) > 78) { + print qq( $s\n); + $s = ""; + } + $s .= $ss; +} +print qq( $s\n); +print "};\n"; +exit; +#endif + +static const char ps_standard_encoding_symbol[] = { + "\0" "space\0" "exclam\0" "quotedbl\0" "numbersign\0" "dollar\0" "percent\0" + "ampersand\0" "quoteright\0" "parenleft\0" "parenright\0" "asterisk\0" + "plus\0" "comma\0" "hyphen\0" "period\0" "slash\0" "zero\0" "one\0" "two\0" + "three\0" "four\0" "five\0" "six\0" "seven\0" "eight\0" "nine\0" "colon\0" + "semicolon\0" "less\0" "equal\0" "greater\0" "question\0" "at\0" "A\0" "B\0" + "C\0" "D\0" "E\0" "F\0" "G\0" "H\0" "I\0" "J\0" "K\0" "L\0" "M\0" "N\0" "O\0" + "P\0" "Q\0" "R\0" "S\0" "T\0" "U\0" "V\0" "W\0" "X\0" "Y\0" "Z\0" + "bracketleft\0" "backslash\0" "bracketright\0" "asciicircum\0" "underscore\0" + "quoteleft\0" "a\0" "b\0" "c\0" "d\0" "e\0" "f\0" "g\0" "h\0" "i\0" "j\0" + "k\0" "l\0" "m\0" "n\0" "o\0" "p\0" "q\0" "r\0" "s\0" "t\0" "u\0" "v\0" "w\0" + "x\0" "y\0" "z\0" "braceleft\0" "bar\0" "braceright\0" "asciitilde\0" + "exclamdown\0" "cent\0" "sterling\0" "fraction\0" "yen\0" "florin\0" + "section\0" "currency\0" "quotesingle\0" "quotedblleft\0" "guillemotleft\0" + "guilsinglleft\0" "guilsinglright\0" "fi\0" "fl\0" "endash\0" "dagger\0" + "daggerdbl\0" "periodcentered\0" "paragraph\0" "bullet\0" "quotesinglbase\0" + "quotedblbase\0" "quotedblright\0" "guillemotright\0" "ellipsis\0" + "perthousand\0" "questiondown\0" "grave\0" "acute\0" "circumflex\0" "tilde\0" + "macron\0" "breve\0" "dotaccent\0" "dieresis\0" "ring\0" "cedilla\0" + "hungarumlaut\0" "ogonek\0" "caron\0" "emdash\0" "AE\0" "ordfeminine\0" + "Lslash\0" "Oslash\0" "OE\0" "ordmasculine\0" "ae\0" "dotlessi\0" "lslash\0" + "oslash\0" "oe\0" "germandbls\0" +}; + +static const int16_t ps_standard_encoding_offset[256] = { + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 1/*space*/, 7/*exclam*/, 14/*quotedbl*/, 23/*numbersign*/, + 34/*dollar*/, 41/*percent*/, 49/*ampersand*/, 59/*quoteright*/, + 70/*parenleft*/, 80/*parenright*/, 91/*asterisk*/, 100/*plus*/, 105/*comma*/, + 111/*hyphen*/, 118/*period*/, 125/*slash*/, 131/*zero*/, 136/*one*/, + 140/*two*/, 144/*three*/, 150/*four*/, 155/*five*/, 160/*six*/, 164/*seven*/, + 170/*eight*/, 176/*nine*/, 181/*colon*/, 187/*semicolon*/, 197/*less*/, + 202/*equal*/, 208/*greater*/, 216/*question*/, 225/*at*/, 228/*A*/, 230/*B*/, + 232/*C*/, 234/*D*/, 236/*E*/, 238/*F*/, 240/*G*/, 242/*H*/, 244/*I*/, + 246/*J*/, 248/*K*/, 250/*L*/, 252/*M*/, 254/*N*/, 256/*O*/, 258/*P*/, + 260/*Q*/, 262/*R*/, 264/*S*/, 266/*T*/, 268/*U*/, 270/*V*/, 272/*W*/, + 274/*X*/, 276/*Y*/, 278/*Z*/, 280/*bracketleft*/, 292/*backslash*/, + 302/*bracketright*/, 315/*asciicircum*/, 327/*underscore*/, 338/*quoteleft*/, + 348/*a*/, 350/*b*/, 352/*c*/, 354/*d*/, 356/*e*/, 358/*f*/, 360/*g*/, + 362/*h*/, 364/*i*/, 366/*j*/, 368/*k*/, 370/*l*/, 372/*m*/, 374/*n*/, + 376/*o*/, 378/*p*/, 380/*q*/, 382/*r*/, 384/*s*/, 386/*t*/, 388/*u*/, + 390/*v*/, 392/*w*/, 394/*x*/, 396/*y*/, 398/*z*/, 400/*braceleft*/, + 410/*bar*/, 414/*braceright*/, 425/*asciitilde*/, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 436/*exclamdown*/, 447/*cent*/, 452/*sterling*/, 461/*fraction*/, 470/*yen*/, + 474/*florin*/, 481/*section*/, 489/*currency*/, 498/*quotesingle*/, + 510/*quotedblleft*/, 523/*guillemotleft*/, 537/*guilsinglleft*/, + 551/*guilsinglright*/, 566/*fi*/, 569/*fl*/, 0, 572/*endash*/, 579/*dagger*/, + 586/*daggerdbl*/, 596/*periodcentered*/, 0, 611/*paragraph*/, 621/*bullet*/, + 628/*quotesinglbase*/, 643/*quotedblbase*/, 656/*quotedblright*/, + 670/*guillemotright*/, 685/*ellipsis*/, 694/*perthousand*/, 0, + 706/*questiondown*/, 0, 719/*grave*/, 725/*acute*/, 731/*circumflex*/, + 742/*tilde*/, 748/*macron*/, 755/*breve*/, 761/*dotaccent*/, 771/*dieresis*/, + 0, 780/*ring*/, 785/*cedilla*/, 0, 793/*hungarumlaut*/, 806/*ogonek*/, + 813/*caron*/, 819/*emdash*/, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 826/*AE*/, 0, 829/*ordfeminine*/, 0, 0, 0, 0, 841/*Lslash*/, 848/*Oslash*/, + 855/*OE*/, 858/*ordmasculine*/, 0, 0, 0, 0, 0, 871/*ae*/, 0, 0, 0, + 874/*dotlessi*/, 0, 0, 883/*lslash*/, 890/*oslash*/, 897/*oe*/, + 900/*germandbls*/, 0, 0, 0, 0, +}; + +#define ps_standard_encoding(index) ((index) ? ps_standard_encoding_symbol+ps_standard_encoding_offset[(index)] : NULL) + +static cairo_status_t +use_standard_encoding_glyph (cairo_type1_font_subset_t *font, int index) +{ + const char *glyph_name; + + if (index < 0 || index > 255) + return CAIRO_STATUS_SUCCESS; + + glyph_name = ps_standard_encoding(index); + if (glyph_name == NULL) + return CAIRO_STATUS_SUCCESS; + + index = cairo_type1_font_subset_lookup_glyph (font, + glyph_name, + strlen(glyph_name)); + if (index < 0) + return CAIRO_INT_STATUS_UNSUPPORTED; + + cairo_type1_font_subset_use_glyph (font, index); + + return CAIRO_STATUS_SUCCESS; +} + +#define TYPE1_CHARSTRING_COMMAND_ESCAPE (12) +#define TYPE1_CHARSTRING_COMMAND_SEAC (32 + 6) + +static cairo_status_t +cairo_type1_font_subset_look_for_seac(cairo_type1_font_subset_t *font, + const char *name, int name_length, + const char *encrypted_charstring, int encrypted_charstring_length) +{ + cairo_status_t status; + unsigned char *charstring; + const unsigned char *end; + const unsigned char *p; + int stack[5], sp, value; + int command; + + charstring = malloc (encrypted_charstring_length); + if (unlikely (charstring == NULL)) + return _cairo_error (CAIRO_STATUS_NO_MEMORY); + + cairo_type1_font_subset_decrypt_charstring ((const unsigned char *) + encrypted_charstring, + encrypted_charstring_length, + charstring); + end = charstring + encrypted_charstring_length; + + p = charstring + 4; + sp = 0; + + while (p < end) { + if (*p < 32) { + command = *p++; + + if (command == TYPE1_CHARSTRING_COMMAND_ESCAPE) + command = 32 + *p++; + + switch (command) { + case TYPE1_CHARSTRING_COMMAND_SEAC: + /* The seac command takes five integer arguments. The + * last two are glyph indices into the PS standard + * encoding give the names of the glyphs that this + * glyph is composed from. All we need to do is to + * make sure those glyphs are present in the subset + * under their standard names. */ + status = use_standard_encoding_glyph (font, stack[3]); + if (unlikely (status)) + return status; + + status = use_standard_encoding_glyph (font, stack[4]); + if (unlikely (status)) + return status; + + sp = 0; + break; + + default: + sp = 0; + break; + } + } else { + /* integer argument */ + p = cairo_type1_font_subset_decode_integer (p, &value); + if (sp < 5) + stack[sp++] = value; + } + } + + free (charstring); + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_status_t +write_used_glyphs (cairo_type1_font_subset_t *font, + const char *name, int name_length, + const char *charstring, int charstring_length) +{ + cairo_status_t status; + char buffer[256]; + int length; + + length = snprintf (buffer, sizeof buffer, + "/%.*s %d %s ", + name_length, name, charstring_length, font->rd); + status = cairo_type1_font_subset_write_encrypted (font, buffer, length); + if (unlikely (status)) + return status; + + status = cairo_type1_font_subset_write_encrypted (font, + charstring, + charstring_length); + if (unlikely (status)) + return status; + + length = snprintf (buffer, sizeof buffer, "%s\n", font->nd); + status = cairo_type1_font_subset_write_encrypted (font, buffer, length); + if (unlikely (status)) + return status; + + return CAIRO_STATUS_SUCCESS; +} + +typedef cairo_status_t (*glyph_func_t) (cairo_type1_font_subset_t *font, + const char *name, int name_length, + const char *charstring, int charstring_length); + +static cairo_status_t +cairo_type1_font_subset_for_each_glyph (cairo_type1_font_subset_t *font, + const char *dict_start, + const char *dict_end, + glyph_func_t func, + const char **dict_out) +{ + int charstring_length, name_length, glyph_index; + const char *p, *charstring, *name; + char *end; + + /* We're looking at '/' in the name of the first glyph. The glyph + * definitions are on the form: + * + * /name 23 RD <23 binary bytes> ND + * + * or alternatively using -| and |- instead of RD and ND. + * + * We parse the glyph name and see if it is in the subset. If it + * is, we call the specified callback with the glyph name and + * glyph data, otherwise we just skip it. We need to parse + * through a glyph definition; we can't just find the next '/', + * since the binary data could contain a '/'. + */ + + p = dict_start; + + while (*p == '/') { + name = p + 1; + p = skip_token (p, dict_end); + name_length = p - name; + + charstring_length = strtol (p, &end, 10); + if (p == end) + return CAIRO_INT_STATUS_UNSUPPORTED; + + /* Skip past -| or RD to binary data. There is exactly one space + * between the -| or RD token and the encrypted data, thus '+ 1'. */ + charstring = skip_token (end, dict_end) + 1; + + /* Skip binary data and |- or ND token. */ + p = skip_token (charstring + charstring_length, dict_end); + while (p < dict_end && _cairo_isspace(*p)) + p++; + + /* In case any of the skip_token() calls above reached EOF, p will + * be equal to dict_end. */ + if (p == dict_end) + return CAIRO_INT_STATUS_UNSUPPORTED; + + glyph_index = cairo_type1_font_subset_lookup_glyph (font, + name, name_length); + if (font->glyphs[glyph_index].subset_index >= 0) { + cairo_status_t status = func (font, + name, name_length, + charstring, charstring_length); + if (unlikely (status)) + return status; + } + } + + *dict_out = p; + + return CAIRO_STATUS_SUCCESS; +} + + +static cairo_status_t +cairo_type1_font_subset_write_private_dict (cairo_type1_font_subset_t *font, + const char *name) +{ + cairo_status_t status; + const char *p, *charstrings, *dict_start; + const char *closefile_token; + char buffer[32], *glyph_count_end; + int num_charstrings, length; + + /* The private dict holds hint information, common subroutines and + * the actual glyph definitions (charstrings). + * + * FIXME: update this comment. + * + * What we do here is scan directly the /CharString token, which + * marks the beginning of the glyph definitions. Then we parse + * through the glyph definitions and weed out the glyphs not in + * our subset. Everything else before and after the glyph + * definitions is copied verbatim to the output. It might be + * worthwile to figure out which of the common subroutines are + * used by the glyphs in the subset and get rid of the rest. */ + + /* FIXME: The /Subrs array contains binary data and could + * conceivably have "/CharStrings" in it, so we might need to skip + * this more cleverly. */ + charstrings = find_token (font->cleartext, font->cleartext_end, "/CharStrings"); + if (charstrings == NULL) + return CAIRO_INT_STATUS_UNSUPPORTED; + + /* Scan past /CharStrings and the integer following it. */ + p = charstrings + strlen ("/CharStrings"); + num_charstrings = strtol (p, &glyph_count_end, 10); + if (p == glyph_count_end) + return CAIRO_INT_STATUS_UNSUPPORTED; + + /* Look for a '/' which marks the beginning of the first glyph + * definition. */ + for (p = glyph_count_end; p < font->cleartext_end; p++) + if (*p == '/') + break; + if (p == font->cleartext_end) + return CAIRO_INT_STATUS_UNSUPPORTED; + dict_start = p; + + status = cairo_type1_font_subset_get_glyph_names_and_widths (font); + if (unlikely (status)) + return status; + + /* Now that we have the private dictionary broken down in + * sections, do the first pass through the glyph definitions to + * figure out which subrs and othersubrs are use and which extra + * glyphs may be required by the seac operator. */ + status = cairo_type1_font_subset_for_each_glyph (font, + dict_start, + font->cleartext_end, + cairo_type1_font_subset_look_for_seac, + &p); + if (unlikely (status)) + return status; + + closefile_token = find_token (p, font->cleartext_end, "closefile"); + if (closefile_token == NULL) + return CAIRO_INT_STATUS_UNSUPPORTED; + + status = cairo_type1_font_subset_get_glyph_names_and_widths (font); + if (unlikely (status)) + return status; + + /* We're ready to start outputting. First write the header, + * i.e. the public part of the font dict.*/ + status = cairo_type1_font_subset_write_header (font, name); + if (unlikely (status)) + return status; + + font->base.header_size = _cairo_output_stream_get_position (font->output); + + + /* Start outputting the private dict. First output everything up + * to the /CharStrings token. */ + status = cairo_type1_font_subset_write_encrypted (font, font->cleartext, + charstrings - font->cleartext); + if (unlikely (status)) + return status; + + /* Write out new charstring count */ + length = snprintf (buffer, sizeof buffer, + "/CharStrings %d", font->num_glyphs); + status = cairo_type1_font_subset_write_encrypted (font, buffer, length); + if (unlikely (status)) + return status; + + /* Write out text between the charstring count and the first + * charstring definition */ + status = cairo_type1_font_subset_write_encrypted (font, glyph_count_end, + dict_start - glyph_count_end); + if (unlikely (status)) + return status; + + /* Write out the charstring definitions for each of the glyphs in + * the subset. */ + status = cairo_type1_font_subset_for_each_glyph (font, + dict_start, + font->cleartext_end, + write_used_glyphs, + &p); + if (unlikely (status)) + return status; + + /* Output what's left between the end of the glyph definitions and + * the end of the private dict to the output. */ + status = cairo_type1_font_subset_write_encrypted (font, p, + closefile_token - p + strlen ("closefile") + 1); + if (unlikely (status)) + return status; + + if (font->hex_encode) + _cairo_output_stream_write (font->output, "\n", 1); + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_status_t +cairo_type1_font_subset_write_trailer(cairo_type1_font_subset_t *font) +{ + const char *cleartomark_token; + int i; + static const char zeros[65] = + "0000000000000000000000000000000000000000000000000000000000000000\n"; + + + for (i = 0; i < 8; i++) + _cairo_output_stream_write (font->output, zeros, sizeof zeros); + + cleartomark_token = find_token (font->type1_data, font->type1_end, "cleartomark"); + if (cleartomark_token) { + /* Some fonts have conditional save/restore around the entire + * font dict, so we need to retain whatever postscript code + * that may come after 'cleartomark'. */ + + _cairo_output_stream_write (font->output, cleartomark_token, + font->type1_end - cleartomark_token); + } else if (!font->eexec_segment_is_ascii) { + /* Fonts embedded in PDF may omit the fixed-content portion + * that includes the 'cleartomark' operator. Type 1 in PDF is + * always binary. */ + + _cairo_output_stream_printf (font->output, "cleartomark"); + } else { + return CAIRO_INT_STATUS_UNSUPPORTED; + } + + /* some fonts do not have a newline at the end of the last line */ + _cairo_output_stream_printf (font->output, "\n"); + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_status_t +type1_font_write (void *closure, const unsigned char *data, unsigned int length) +{ + cairo_type1_font_subset_t *font = closure; + + return _cairo_array_append_multiple (&font->contents, data, length); +} + +static cairo_status_t +cairo_type1_font_subset_write (cairo_type1_font_subset_t *font, + const char *name) +{ + cairo_status_t status; + + status = cairo_type1_font_subset_find_segments (font); + if (unlikely (status)) + return status; + + status = cairo_type1_font_subset_decrypt_eexec_segment (font); + if (unlikely (status)) + return status; + + /* Determine which glyph definition delimiters to use. */ + if (find_token (font->cleartext, font->cleartext_end, "/-|") != NULL) { + font->rd = "-|"; + font->nd = "|-"; + } else if (find_token (font->cleartext, font->cleartext_end, "/RD") != NULL) { + font->rd = "RD"; + font->nd = "ND"; + } else { + /* Don't know *what* kind of font this is... */ + return CAIRO_INT_STATUS_UNSUPPORTED; + } + + font->eexec_key = CAIRO_TYPE1_PRIVATE_DICT_KEY; + font->hex_column = 0; + + status = cairo_type1_font_subset_write_private_dict (font, name); + if (unlikely (status)) + return status; + + font->base.data_size = _cairo_output_stream_get_position (font->output) - + font->base.header_size; + + status = cairo_type1_font_subset_write_trailer (font); + if (unlikely (status)) + return status; + + font->base.trailer_size = + _cairo_output_stream_get_position (font->output) - + font->base.header_size - font->base.data_size; + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_status_t +cairo_type1_font_subset_generate (void *abstract_font, + const char *name) + +{ + cairo_type1_font_subset_t *font = abstract_font; + cairo_ft_unscaled_font_t *ft_unscaled_font; + unsigned long ret; + cairo_status_t status; + + ft_unscaled_font = (cairo_ft_unscaled_font_t *) font->base.unscaled_font; + font->face = _cairo_ft_unscaled_font_lock_face (ft_unscaled_font); + if (unlikely (font->face == NULL)) + return _cairo_error (CAIRO_STATUS_NO_MEMORY); + + font->type1_length = font->face->stream->size; + font->type1_data = malloc (font->type1_length); + if (unlikely (font->type1_data == NULL)) { + status = _cairo_error (CAIRO_STATUS_NO_MEMORY); + goto fail; + } + + if (font->face->stream->read != NULL) { + /* Note that read() may be implemented as a macro, thanks POSIX!, so we + * need to wrap the following usage in parentheses in order to + * disambiguate it for the pre-processor - using the verbose function + * pointer dereference for clarity. + */ + ret = (* font->face->stream->read) (font->face->stream, 0, + (unsigned char *) font->type1_data, + font->type1_length); + if (ret != font->type1_length) { + status = _cairo_error (CAIRO_STATUS_READ_ERROR); + goto fail; + } + } else { + memcpy (font->type1_data, + font->face->stream->base, font->type1_length); + } + + status = _cairo_array_grow_by (&font->contents, 4096); + if (unlikely (status)) + goto fail; + + font->output = _cairo_output_stream_create (type1_font_write, NULL, font); + if (unlikely ((status = font->output->status))) + goto fail; + + status = cairo_type1_font_subset_write (font, name); + if (unlikely (status)) + goto fail; + + font->base.data = _cairo_array_index (&font->contents, 0); + + fail: + _cairo_ft_unscaled_font_unlock_face (ft_unscaled_font); + + return status; +} + +static cairo_status_t +_cairo_type1_font_subset_fini (cairo_type1_font_subset_t *font) +{ + cairo_status_t status = CAIRO_STATUS_SUCCESS; + unsigned int i; + + /* If the subset generation failed, some of the pointers below may + * be NULL depending on at which point the error occurred. */ + + _cairo_array_fini (&font->contents); + + free (font->type1_data); + if (font->glyphs != NULL) { + for (i = 0; i < font->base.num_glyphs; i++) + free (font->glyphs[i].name); + } + + _cairo_unscaled_font_destroy (font->base.unscaled_font); + + if (font->output != NULL) + status = _cairo_output_stream_destroy (font->output); + + if (font->base.base_font) + free (font->base.base_font); + free (font->glyphs); + + return status; +} + +cairo_status_t +_cairo_type1_subset_init (cairo_type1_subset_t *type1_subset, + const char *name, + cairo_scaled_font_subset_t *scaled_font_subset, + cairo_bool_t hex_encode) +{ + cairo_type1_font_subset_t font; + cairo_status_t status, status_ignored; + unsigned long parent_glyph, length; + unsigned int i; + cairo_unscaled_font_t *unscaled_font; + char buf[30]; + + /* XXX: Need to fix this to work with a general cairo_unscaled_font_t. */ + if (!_cairo_scaled_font_is_ft (scaled_font_subset->scaled_font)) + return CAIRO_INT_STATUS_UNSUPPORTED; + + if (_cairo_ft_scaled_font_is_vertical (scaled_font_subset->scaled_font)) + return CAIRO_INT_STATUS_UNSUPPORTED; + + unscaled_font = _cairo_ft_scaled_font_get_unscaled_font (scaled_font_subset->scaled_font); + + status = _cairo_type1_font_subset_init (&font, unscaled_font, hex_encode); + if (unlikely (status)) + return status; + + for (i = 0; i < scaled_font_subset->num_glyphs; i++) { + parent_glyph = scaled_font_subset->glyphs[i]; + cairo_type1_font_subset_use_glyph (&font, parent_glyph); + } + + status = cairo_type1_font_subset_generate (&font, name); + if (unlikely (status)) + goto fail1; + + if (font.base.base_font) { + type1_subset->base_font = strdup (font.base.base_font); + } else { + snprintf(buf, sizeof (buf), "CairoFont-%u-%u", + scaled_font_subset->font_id, scaled_font_subset->subset_id); + type1_subset->base_font = strdup (buf); + } + if (unlikely (type1_subset->base_font == NULL)) + goto fail1; + + type1_subset->widths = calloc (sizeof (double), font.num_glyphs); + if (unlikely (type1_subset->widths == NULL)) + goto fail2; + for (i = 0; i < font.base.num_glyphs; i++) { + if (font.glyphs[i].subset_index < 0) + continue; + type1_subset->widths[font.glyphs[i].subset_index] = + font.glyphs[i].width; + } + + type1_subset->x_min = font.base.x_min; + type1_subset->y_min = font.base.y_min; + type1_subset->x_max = font.base.x_max; + type1_subset->y_max = font.base.y_max; + type1_subset->ascent = font.base.ascent; + type1_subset->descent = font.base.descent; + + length = font.base.header_size + + font.base.data_size + + font.base.trailer_size; + type1_subset->data = malloc (length); + if (unlikely (type1_subset->data == NULL)) + goto fail3; + + memcpy (type1_subset->data, + _cairo_array_index (&font.contents, 0), length); + + type1_subset->header_length = font.base.header_size; + type1_subset->data_length = font.base.data_size; + type1_subset->trailer_length = font.base.trailer_size; + + return _cairo_type1_font_subset_fini (&font); + + fail3: + free (type1_subset->widths); + fail2: + free (type1_subset->base_font); + fail1: + status_ignored = _cairo_type1_font_subset_fini (&font); + + return status; +} + +void +_cairo_type1_subset_fini (cairo_type1_subset_t *subset) +{ + free (subset->base_font); + free (subset->widths); + free (subset->data); +} + +cairo_bool_t +_cairo_type1_scaled_font_is_type1 (cairo_scaled_font_t *scaled_font) +{ + cairo_ft_unscaled_font_t *unscaled; + FT_Face face; + PS_FontInfoRec font_info; + cairo_bool_t is_type1 = FALSE; + + if (!_cairo_scaled_font_is_ft (scaled_font)) + return FALSE; + unscaled = (cairo_ft_unscaled_font_t *) _cairo_ft_scaled_font_get_unscaled_font (scaled_font); + face = _cairo_ft_unscaled_font_lock_face (unscaled); + if (!face) + return FALSE; + + if (FT_Get_PS_Font_Info(face, &font_info) == 0) + is_type1 = TRUE; + + /* OpenType/CFF fonts also have a PS_FontInfoRec */ +#if HAVE_FT_LOAD_SFNT_TABLE + if (FT_IS_SFNT (face)) + is_type1 = FALSE; +#endif + + _cairo_ft_unscaled_font_unlock_face (unscaled); + + return is_type1; +} + +#endif /* CAIRO_HAS_FT_FONT */ + +#endif /* CAIRO_HAS_FONT_SUBSET */ diff --git a/programs/develop/libraries/cairo/src/cairo-type3-glyph-surface.c b/programs/develop/libraries/cairo/src/cairo-type3-glyph-surface.c new file mode 100644 index 0000000000..74257d4bf8 --- /dev/null +++ b/programs/develop/libraries/cairo/src/cairo-type3-glyph-surface.c @@ -0,0 +1,563 @@ +/* -*- Mode: c; c-basic-offset: 4; indent-tabs-mode: t; tab-width: 8; -*- */ +/* cairo - a vector graphics library with display and print output + * + * Copyright © 2008 Adrian Johnson + * + * This library is free software; you can redistribute it and/or + * modify it either under the terms of the GNU Lesser General Public + * License version 2.1 as published by the Free Software Foundation + * (the "LGPL") or, at your option, under the terms of the Mozilla + * Public License Version 1.1 (the "MPL"). If you do not alter this + * notice, a recipient may use your version of this file under either + * the MPL or the LGPL. + * + * You should have received a copy of the LGPL along with this library + * in the file COPYING-LGPL-2.1; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA + * You should have received a copy of the MPL along with this library + * in the file COPYING-MPL-1.1 + * + * The contents of this file are subject to the Mozilla Public License + * Version 1.1 (the "License"); you may not use this file except in + * compliance with the License. You may obtain a copy of the License at + * http://www.mozilla.org/MPL/ + * + * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY + * OF ANY KIND, either express or implied. See the LGPL or the MPL for + * the specific language governing rights and limitations. + * + * The Original Code is the cairo graphics library. + * + * The Initial Developer of the Original Code is Adrian Johnson. + * + * Contributor(s): + * Adrian Johnson + */ + +#include "cairoint.h" + +#if CAIRO_HAS_FONT_SUBSET + +#include "cairo-type3-glyph-surface-private.h" +#include "cairo-output-stream-private.h" +#include "cairo-recording-surface-private.h" +#include "cairo-analysis-surface-private.h" +#include "cairo-error-private.h" +#include "cairo-surface-clipper-private.h" + +static const cairo_surface_backend_t cairo_type3_glyph_surface_backend; + +static cairo_status_t +_cairo_type3_glyph_surface_clipper_intersect_clip_path (cairo_surface_clipper_t *clipper, + cairo_path_fixed_t *path, + cairo_fill_rule_t fill_rule, + double tolerance, + cairo_antialias_t antialias) +{ + cairo_type3_glyph_surface_t *surface = cairo_container_of (clipper, + cairo_type3_glyph_surface_t, + clipper); + + if (path == NULL) { + _cairo_output_stream_printf (surface->stream, "Q q\n"); + return CAIRO_STATUS_SUCCESS; + } + + return _cairo_pdf_operators_clip (&surface->pdf_operators, + path, + fill_rule); +} + +cairo_surface_t * +_cairo_type3_glyph_surface_create (cairo_scaled_font_t *scaled_font, + cairo_output_stream_t *stream, + cairo_type3_glyph_surface_emit_image_t emit_image, + cairo_scaled_font_subsets_t *font_subsets) +{ + cairo_type3_glyph_surface_t *surface; + cairo_matrix_t invert_y_axis; + + if (unlikely (stream != NULL && stream->status)) + return _cairo_surface_create_in_error (stream->status); + + surface = malloc (sizeof (cairo_type3_glyph_surface_t)); + if (unlikely (surface == NULL)) + return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_NO_MEMORY)); + + _cairo_surface_init (&surface->base, + &cairo_type3_glyph_surface_backend, + NULL, /* device */ + CAIRO_CONTENT_COLOR_ALPHA); + + surface->scaled_font = scaled_font; + surface->stream = stream; + surface->emit_image = emit_image; + + /* Setup the transform from the user-font device space to Type 3 + * font space. The Type 3 font space is defined by the FontMatrix + * entry in the Type 3 dictionary. In the PDF backend this is an + * identity matrix. */ + surface->cairo_to_pdf = scaled_font->scale_inverse; + cairo_matrix_init_scale (&invert_y_axis, 1, -1); + cairo_matrix_multiply (&surface->cairo_to_pdf, &surface->cairo_to_pdf, &invert_y_axis); + + _cairo_pdf_operators_init (&surface->pdf_operators, + surface->stream, + &surface->cairo_to_pdf, + font_subsets); + + _cairo_surface_clipper_init (&surface->clipper, + _cairo_type3_glyph_surface_clipper_intersect_clip_path); + + return &surface->base; +} + +static cairo_status_t +_cairo_type3_glyph_surface_emit_image (cairo_type3_glyph_surface_t *surface, + cairo_image_surface_t *image, + cairo_matrix_t *image_matrix) +{ + cairo_status_t status; + + /* The only image type supported by Type 3 fonts are 1-bit masks */ + image = _cairo_image_surface_coerce_to_format (image, CAIRO_FORMAT_A1); + status = image->base.status; + if (unlikely (status)) + return status; + + _cairo_output_stream_printf (surface->stream, + "q %f %f %f %f %f %f cm\n", + image_matrix->xx, + image_matrix->xy, + image_matrix->yx, + image_matrix->yy, + image_matrix->x0, + image_matrix->y0); + + status = surface->emit_image (image, surface->stream); + cairo_surface_destroy (&image->base); + + _cairo_output_stream_printf (surface->stream, + "Q\n"); + + return status; +} + +static cairo_status_t +_cairo_type3_glyph_surface_emit_image_pattern (cairo_type3_glyph_surface_t *surface, + cairo_image_surface_t *image, + const cairo_matrix_t *pattern_matrix) +{ + cairo_matrix_t mat, upside_down; + cairo_status_t status; + + if (image->width == 0 || image->height == 0) + return CAIRO_STATUS_SUCCESS; + + mat = *pattern_matrix; + + /* Get the pattern space to user space matrix */ + status = cairo_matrix_invert (&mat); + + /* cairo_pattern_set_matrix ensures the matrix is invertible */ + assert (status == CAIRO_STATUS_SUCCESS); + + /* Make this a pattern space to Type 3 font space matrix */ + cairo_matrix_multiply (&mat, &mat, &surface->cairo_to_pdf); + + /* PDF images are in a 1 unit by 1 unit image space. Turn the 1 by + * 1 image upside down to convert to flip the Y-axis going from + * cairo to PDF. Then scale the image up to the required size. */ + cairo_matrix_scale (&mat, image->width, image->height); + cairo_matrix_init (&upside_down, 1, 0, 0, -1, 0, 1); + cairo_matrix_multiply (&mat, &upside_down, &mat); + + return _cairo_type3_glyph_surface_emit_image (surface, image, &mat); +} + +static cairo_status_t +_cairo_type3_glyph_surface_finish (void *abstract_surface) +{ + cairo_type3_glyph_surface_t *surface = abstract_surface; + + return _cairo_pdf_operators_fini (&surface->pdf_operators); +} + +static cairo_int_status_t +_cairo_type3_glyph_surface_paint (void *abstract_surface, + cairo_operator_t op, + const cairo_pattern_t *source, + cairo_clip_t *clip) +{ + cairo_type3_glyph_surface_t *surface = abstract_surface; + const cairo_surface_pattern_t *pattern; + cairo_image_surface_t *image; + void *image_extra; + cairo_status_t status; + + if (source->type != CAIRO_PATTERN_TYPE_SURFACE) + return CAIRO_INT_STATUS_IMAGE_FALLBACK; + + status = _cairo_surface_clipper_set_clip (&surface->clipper, clip); + if (unlikely (status)) + return status; + + pattern = (const cairo_surface_pattern_t *) source; + status = _cairo_surface_acquire_source_image (pattern->surface, + &image, &image_extra); + if (unlikely (status)) + goto fail; + + status = _cairo_type3_glyph_surface_emit_image_pattern (surface, + image, + &pattern->base.matrix); + +fail: + _cairo_surface_release_source_image (pattern->surface, image, image_extra); + + return status; +} + +static cairo_int_status_t +_cairo_type3_glyph_surface_mask (void *abstract_surface, + cairo_operator_t op, + const cairo_pattern_t *source, + const cairo_pattern_t *mask, + cairo_clip_t *clip) +{ + return _cairo_type3_glyph_surface_paint (abstract_surface, + op, mask, + clip); +} + +static cairo_int_status_t +_cairo_type3_glyph_surface_stroke (void *abstract_surface, + cairo_operator_t op, + const cairo_pattern_t *source, + cairo_path_fixed_t *path, + const cairo_stroke_style_t *style, + const cairo_matrix_t *ctm, + const cairo_matrix_t *ctm_inverse, + double tolerance, + cairo_antialias_t antialias, + cairo_clip_t *clip) +{ + cairo_type3_glyph_surface_t *surface = abstract_surface; + cairo_int_status_t status; + + status = _cairo_surface_clipper_set_clip (&surface->clipper, clip); + if (unlikely (status)) + return status; + + return _cairo_pdf_operators_stroke (&surface->pdf_operators, + path, + style, + ctm, + ctm_inverse); +} + +static cairo_int_status_t +_cairo_type3_glyph_surface_fill (void *abstract_surface, + cairo_operator_t op, + const cairo_pattern_t *source, + cairo_path_fixed_t *path, + cairo_fill_rule_t fill_rule, + double tolerance, + cairo_antialias_t antialias, + cairo_clip_t *clip) +{ + cairo_type3_glyph_surface_t *surface = abstract_surface; + cairo_int_status_t status; + + status = _cairo_surface_clipper_set_clip (&surface->clipper, clip); + if (unlikely (status)) + return status; + + return _cairo_pdf_operators_fill (&surface->pdf_operators, + path, + fill_rule); +} + +static cairo_int_status_t +_cairo_type3_glyph_surface_show_glyphs (void *abstract_surface, + cairo_operator_t op, + const cairo_pattern_t *source, + cairo_glyph_t *glyphs, + int num_glyphs, + cairo_scaled_font_t *scaled_font, + cairo_clip_t *clip, + int *remaining_glyphs) +{ + cairo_type3_glyph_surface_t *surface = abstract_surface; + cairo_int_status_t status; + cairo_scaled_font_t *font; + cairo_matrix_t new_ctm, invert_y_axis; + + status = _cairo_surface_clipper_set_clip (&surface->clipper, clip); + if (unlikely (status)) + return status; + + cairo_matrix_init_scale (&invert_y_axis, 1, -1); + cairo_matrix_multiply (&new_ctm, &invert_y_axis, &scaled_font->ctm); + cairo_matrix_multiply (&new_ctm, &surface->cairo_to_pdf, &new_ctm); + font = cairo_scaled_font_create (scaled_font->font_face, + &scaled_font->font_matrix, + &new_ctm, + &scaled_font->options); + if (unlikely (font->status)) + return font->status; + + status = _cairo_pdf_operators_show_text_glyphs (&surface->pdf_operators, + NULL, 0, + glyphs, num_glyphs, + NULL, 0, + FALSE, + font); + + cairo_scaled_font_destroy (font); + + return status; +} + +static const cairo_surface_backend_t cairo_type3_glyph_surface_backend = { + CAIRO_INTERNAL_SURFACE_TYPE_TYPE3_GLYPH, + NULL, /* _cairo_type3_glyph_surface_create_similar */ + _cairo_type3_glyph_surface_finish, + NULL, /* acquire_source_image */ + NULL, /* release_source_image */ + NULL, /* acquire_dest_image */ + NULL, /* release_dest_image */ + NULL, /* clone_similar */ + NULL, /* composite */ + NULL, /* fill_rectangles */ + NULL, /* composite_trapezoids */ + NULL, /* create_span_renderer */ + NULL, /* check_span_renderer */ + NULL, /* cairo_type3_glyph_surface_copy_page */ + NULL, /* _cairo_type3_glyph_surface_show_page */ + NULL, /* _cairo_type3_glyph_surface_get_extents */ + NULL, /* old_show_glyphs */ + NULL, /* _cairo_type3_glyph_surface_get_font_options */ + NULL, /* flush */ + NULL, /* mark_dirty_rectangle */ + NULL, /* scaled_font_fini */ + NULL, /* scaled_glyph_fini */ + _cairo_type3_glyph_surface_paint, + _cairo_type3_glyph_surface_mask, + _cairo_type3_glyph_surface_stroke, + _cairo_type3_glyph_surface_fill, + _cairo_type3_glyph_surface_show_glyphs, + NULL, /* snapshot */ +}; + +static void +_cairo_type3_glyph_surface_set_stream (cairo_type3_glyph_surface_t *surface, + cairo_output_stream_t *stream) +{ + surface->stream = stream; + _cairo_pdf_operators_set_stream (&surface->pdf_operators, stream); +} + +static cairo_status_t +_cairo_type3_glyph_surface_emit_fallback_image (cairo_type3_glyph_surface_t *surface, + unsigned long glyph_index) +{ + cairo_scaled_glyph_t *scaled_glyph; + cairo_status_t status; + cairo_image_surface_t *image; + cairo_matrix_t mat; + double x, y; + + status = _cairo_scaled_glyph_lookup (surface->scaled_font, + glyph_index, + CAIRO_SCALED_GLYPH_INFO_METRICS | + CAIRO_SCALED_GLYPH_INFO_SURFACE, + &scaled_glyph); + if (unlikely (status)) + return status; + + image = scaled_glyph->surface; + if (image->width == 0 || image->height == 0) + return CAIRO_STATUS_SUCCESS; + + x = _cairo_fixed_to_double (scaled_glyph->bbox.p1.x); + y = _cairo_fixed_to_double (scaled_glyph->bbox.p2.y); + mat.xx = image->width; + mat.xy = 0; + mat.yx = 0; + mat.yy = image->height; + mat.x0 = x; + mat.y0 = y; + cairo_matrix_multiply (&mat, &mat, &surface->scaled_font->scale_inverse); + mat.y0 *= -1; + + return _cairo_type3_glyph_surface_emit_image (surface, image, &mat); +} + +void +_cairo_type3_glyph_surface_set_font_subsets_callback (void *abstract_surface, + cairo_pdf_operators_use_font_subset_t use_font_subset, + void *closure) +{ + cairo_type3_glyph_surface_t *surface = abstract_surface; + + if (unlikely (surface->base.status)) + return; + + _cairo_pdf_operators_set_font_subsets_callback (&surface->pdf_operators, + use_font_subset, + closure); +} + +cairo_status_t +_cairo_type3_glyph_surface_analyze_glyph (void *abstract_surface, + unsigned long glyph_index) +{ + cairo_type3_glyph_surface_t *surface = abstract_surface; + cairo_scaled_glyph_t *scaled_glyph; + cairo_status_t status, status2; + cairo_output_stream_t *null_stream; + + if (unlikely (surface->base.status)) + return surface->base.status; + + null_stream = _cairo_null_stream_create (); + if (unlikely (null_stream->status)) + return null_stream->status; + + _cairo_type3_glyph_surface_set_stream (surface, null_stream); + + _cairo_scaled_font_freeze_cache (surface->scaled_font); + status = _cairo_scaled_glyph_lookup (surface->scaled_font, + glyph_index, + CAIRO_SCALED_GLYPH_INFO_RECORDING_SURFACE, + &scaled_glyph); + + if (_cairo_status_is_error (status)) + goto cleanup; + + if (status == CAIRO_INT_STATUS_UNSUPPORTED) { + status = CAIRO_STATUS_SUCCESS; + goto cleanup; + } + + status = _cairo_recording_surface_replay (scaled_glyph->recording_surface, + &surface->base); + if (unlikely (status)) + goto cleanup; + + status = _cairo_pdf_operators_flush (&surface->pdf_operators); + if (status == CAIRO_INT_STATUS_IMAGE_FALLBACK) + status = CAIRO_STATUS_SUCCESS; + +cleanup: + _cairo_scaled_font_thaw_cache (surface->scaled_font); + + status2 = _cairo_output_stream_destroy (null_stream); + if (status == CAIRO_STATUS_SUCCESS) + status = status2; + + return status; +} + +cairo_status_t +_cairo_type3_glyph_surface_emit_glyph (void *abstract_surface, + cairo_output_stream_t *stream, + unsigned long glyph_index, + cairo_box_t *bbox, + double *width) +{ + cairo_type3_glyph_surface_t *surface = abstract_surface; + cairo_scaled_glyph_t *scaled_glyph; + cairo_status_t status, status2; + double x_advance, y_advance; + cairo_matrix_t font_matrix_inverse; + + if (unlikely (surface->base.status)) + return surface->base.status; + + _cairo_type3_glyph_surface_set_stream (surface, stream); + + _cairo_scaled_font_freeze_cache (surface->scaled_font); + status = _cairo_scaled_glyph_lookup (surface->scaled_font, + glyph_index, + CAIRO_SCALED_GLYPH_INFO_METRICS | + CAIRO_SCALED_GLYPH_INFO_RECORDING_SURFACE, + &scaled_glyph); + if (status == CAIRO_INT_STATUS_UNSUPPORTED) { + status = _cairo_scaled_glyph_lookup (surface->scaled_font, + glyph_index, + CAIRO_SCALED_GLYPH_INFO_METRICS, + &scaled_glyph); + if (status == CAIRO_STATUS_SUCCESS) + status = CAIRO_INT_STATUS_IMAGE_FALLBACK; + } + if (_cairo_status_is_error (status)) { + _cairo_scaled_font_thaw_cache (surface->scaled_font); + return status; + } + + x_advance = scaled_glyph->metrics.x_advance; + y_advance = scaled_glyph->metrics.y_advance; + font_matrix_inverse = surface->scaled_font->font_matrix; + status2 = cairo_matrix_invert (&font_matrix_inverse); + + /* The invertability of font_matrix is tested in + * pdf_operators_show_glyphs before any glyphs are mapped to the + * subset. */ + assert (status2 == CAIRO_STATUS_SUCCESS); + + cairo_matrix_transform_distance (&font_matrix_inverse, &x_advance, &y_advance); + *width = x_advance; + + *bbox = scaled_glyph->bbox; + _cairo_matrix_transform_bounding_box_fixed (&surface->scaled_font->scale_inverse, + bbox, NULL); + + _cairo_output_stream_printf (surface->stream, + "%f 0 %f %f %f %f d1\n", + x_advance, + _cairo_fixed_to_double (bbox->p1.x), + - _cairo_fixed_to_double (bbox->p2.y), + _cairo_fixed_to_double (bbox->p2.x), + - _cairo_fixed_to_double (bbox->p1.y)); + + if (status == CAIRO_STATUS_SUCCESS) { + cairo_output_stream_t *mem_stream; + + mem_stream = _cairo_memory_stream_create (); + status = mem_stream->status; + if (unlikely (status)) + goto FAIL; + + _cairo_type3_glyph_surface_set_stream (surface, mem_stream); + + _cairo_output_stream_printf (surface->stream, "q\n"); + status = _cairo_recording_surface_replay (scaled_glyph->recording_surface, + &surface->base); + + status2 = _cairo_pdf_operators_flush (&surface->pdf_operators); + if (status == CAIRO_STATUS_SUCCESS) + status = status2; + + _cairo_output_stream_printf (surface->stream, "Q\n"); + + _cairo_type3_glyph_surface_set_stream (surface, stream); + if (status == CAIRO_STATUS_SUCCESS) + _cairo_memory_stream_copy (mem_stream, stream); + + status2 = _cairo_output_stream_destroy (mem_stream); + if (status == CAIRO_STATUS_SUCCESS) + status = status2; + } + + if (status == CAIRO_INT_STATUS_IMAGE_FALLBACK) + status = _cairo_type3_glyph_surface_emit_fallback_image (surface, glyph_index); + + FAIL: + _cairo_scaled_font_thaw_cache (surface->scaled_font); + + return status; +} + +#endif /* CAIRO_HAS_FONT_SUBSET */ diff --git a/programs/develop/libraries/libpng/LICENSE b/programs/develop/libraries/libpng/LICENSE new file mode 100644 index 0000000000..b28f15c74f --- /dev/null +++ b/programs/develop/libraries/libpng/LICENSE @@ -0,0 +1,111 @@ + +This copy of the libpng notices is provided for your convenience. In case of +any discrepancy between this copy and the notices in the file png.h that is +included in the libpng distribution, the latter shall prevail. + +COPYRIGHT NOTICE, DISCLAIMER, and LICENSE: + +If you modify libpng you may insert additional notices immediately following +this sentence. + +This code is released under the libpng license. + +libpng versions 1.2.6, August 15, 2004, through 1.5.1, February 3, 2011, are +Copyright (c) 2004, 2006-2011 Glenn Randers-Pehrson, and are +distributed according to the same disclaimer and license as libpng-1.2.5 +with the following individual added to the list of Contributing Authors + + Cosmin Truta + +libpng versions 1.0.7, July 1, 2000, through 1.2.5 - October 3, 2002, are +Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are +distributed according to the same disclaimer and license as libpng-1.0.6 +with the following individuals added to the list of Contributing Authors + + Simon-Pierre Cadieux + Eric S. Raymond + Gilles Vollant + +and with the following additions to the disclaimer: + + There is no warranty against interference with your enjoyment of the + library or against infringement. There is no warranty that our + efforts or the library will fulfill any of your particular purposes + or needs. This library is provided with all faults, and the entire + risk of satisfactory quality, performance, accuracy, and effort is with + the user. + +libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are +Copyright (c) 1998, 1999 Glenn Randers-Pehrson, and are +distributed according to the same disclaimer and license as libpng-0.96, +with the following individuals added to the list of Contributing Authors: + + Tom Lane + Glenn Randers-Pehrson + Willem van Schaik + +libpng versions 0.89, June 1996, through 0.96, May 1997, are +Copyright (c) 1996, 1997 Andreas Dilger +Distributed according to the same disclaimer and license as libpng-0.88, +with the following individuals added to the list of Contributing Authors: + + John Bowler + Kevin Bracey + Sam Bushell + Magnus Holmgren + Greg Roelofs + Tom Tanner + +libpng versions 0.5, May 1995, through 0.88, January 1996, are +Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. + +For the purposes of this copyright and license, "Contributing Authors" +is defined as the following set of individuals: + + Andreas Dilger + Dave Martindale + Guy Eric Schalnat + Paul Schmidt + Tim Wegner + +The PNG Reference Library is supplied "AS IS". The Contributing Authors +and Group 42, Inc. disclaim all warranties, expressed or implied, +including, without limitation, the warranties of merchantability and of +fitness for any purpose. The Contributing Authors and Group 42, Inc. +assume no liability for direct, indirect, incidental, special, exemplary, +or consequential damages, which may result from the use of the PNG +Reference Library, even if advised of the possibility of such damage. + +Permission is hereby granted to use, copy, modify, and distribute this +source code, or portions hereof, for any purpose, without fee, subject +to the following restrictions: + +1. The origin of this source code must not be misrepresented. + +2. Altered versions must be plainly marked as such and must not + be misrepresented as being the original source. + +3. This Copyright notice may not be removed or altered from any + source or altered source distribution. + +The Contributing Authors and Group 42, Inc. specifically permit, without +fee, and encourage the use of this source code as a component to +supporting the PNG file format in commercial products. If you use this +source code in a product, acknowledgment is not required but would be +appreciated. + + +A "png_get_copyright" function is available, for convenient use in "about" +boxes and the like: + + printf("%s",png_get_copyright(NULL)); + +Also, the PNG logo (in PNG format, of course) is supplied in the +files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31). + +Libpng is OSI Certified Open Source Software. OSI Certified Open Source is a +certification mark of the Open Source Initiative. + +Glenn Randers-Pehrson +glennrp at users.sourceforge.net +February 3, 2011 diff --git a/programs/develop/libraries/libpng/Makefile b/programs/develop/libraries/libpng/Makefile new file mode 100644 index 0000000000..ca2cf07f83 --- /dev/null +++ b/programs/develop/libraries/libpng/Makefile @@ -0,0 +1,44 @@ + +LIBRARY= libpng + +CC=gcc +CPP=gcc -E +AR= ar rc + +CFLAGS = -c -O2 -fomit-frame-pointer + +DEFS = -DHAVE_CONFIG_H + +LIBPNG_DEFINES = -DPNG_CONFIGURE_LIBPNG + +DEFINES= $(DEFS) $(LIBPNG_DEFINES) + +INCLUDES= -I../newlib/include -I../zlib + + +SOURCES = png.c pngerror.c pngget.c pngmem.c pngpread.c \ + pngread.c pngrio.c pngrtran.c pngrutil.c \ + pngset.c pngtrans.c pngwio.c pngwrite.c \ + pngwtran.c pngwutil.c png.h pngconf.h \ + pngdebug.h pnginfo.h pngpriv.h pngstruct.h + + + +OBJECTS = $(patsubst %.c, %.o, $(SOURCES)) + + +# targets + + +all:$(LIBRARY).a + + +$(LIBRARY).a: $(OBJECTS) Makefile + ar cvrs $(LIBRARY).a $(OBJECTS) + + +%.o : %.c Makefile + $(CC) $(CFLAGS) $(DEFINES) $(INCLUDES) -o $@ $< + + + diff --git a/programs/develop/libraries/libpng/config.h b/programs/develop/libraries/libpng/config.h new file mode 100644 index 0000000000..00a1f4e2fa --- /dev/null +++ b/programs/develop/libraries/libpng/config.h @@ -0,0 +1,87 @@ +/* config.h. Generated from config.h.in by configure. */ +/* config.h.in. Generated from configure.ac by autoheader. */ + +/* Define to 1 if you have the header file. */ +#define HAVE_DLFCN_H 1 + +/* Define to 1 if you have the header file. */ +#define HAVE_INTTYPES_H 1 + +/* Define to 1 if you have the `m' library (-lm). */ +#define HAVE_LIBM 1 + +/* Define to 1 if you have the `z' library (-lz). */ +#define HAVE_LIBZ 1 + +/* Define to 1 if you have the header file. */ +#define HAVE_MALLOC_H 1 + +/* Define to 1 if you have the header file. */ +#define HAVE_MEMORY_H 1 + +/* Define to 1 if you have the `memset' function. */ +#define HAVE_MEMSET 1 + +/* Define to 1 if you have the `pow' function. */ +/* #undef HAVE_POW */ + +/* Define to 1 if you have the header file. */ +#define HAVE_STDINT_H 1 + +/* Define to 1 if you have the header file. */ +#define HAVE_STDLIB_H 1 + +/* Define to 1 if you have the header file. */ +#define HAVE_STRINGS_H 1 + +/* Define to 1 if you have the header file. */ +#define HAVE_STRING_H 1 + +/* Define to 1 if you have the header file. */ +#define HAVE_SYS_STAT_H 1 + +/* Define to 1 if you have the header file. */ +#define HAVE_SYS_TYPES_H 1 + +/* Define to 1 if you have the header file. */ +#define HAVE_UNISTD_H 1 + +/* Define to the sub-directory in which libtool stores uninstalled libraries. + */ +#define LT_OBJDIR ".libs/" + +/* Name of package */ +#define PACKAGE "libpng" + +/* Define to the address where bug reports for this package should be sent. */ +#define PACKAGE_BUGREPORT "png-mng-implement@lists.sourceforge.net" + +/* Define to the full name of this package. */ +#define PACKAGE_NAME "libpng" + +/* Define to the full name and version of this package. */ +#define PACKAGE_STRING "libpng 1.5.1" + +/* Define to the one symbol short name of this package. */ +#define PACKAGE_TARNAME "libpng" + +/* Define to the home page for this package. */ +#define PACKAGE_URL "" + +/* Define to the version of this package. */ +#define PACKAGE_VERSION "1.5.1" + +/* Define to 1 if you have the ANSI C header files. */ +#define STDC_HEADERS 1 + +/* Define to 1 if your declares `struct tm'. */ +/* #undef TM_IN_SYS_TIME */ + +/* Version number of package */ +#define VERSION "1.5.1" + +/* Define to empty if `const' does not conform to ANSI C. */ +/* #undef const */ + +/* Define to `unsigned int' if does not define. */ +/* #undef size_t */ diff --git a/programs/develop/libraries/libpng/libpng-manual.txt b/programs/develop/libraries/libpng/libpng-manual.txt new file mode 100644 index 0000000000..77adf7aec8 --- /dev/null +++ b/programs/develop/libraries/libpng/libpng-manual.txt @@ -0,0 +1,4136 @@ +libpng-manual.txt - A description on how to use and modify libpng + + libpng version 1.5.1 - February 3, 2011 + Updated and distributed by Glenn Randers-Pehrson + + Copyright (c) 1998-2011 Glenn Randers-Pehrson + + This document is released under the libpng license. + For conditions of distribution and use, see the disclaimer + and license in png.h + + Based on: + + libpng versions 0.97, January 1998, through 1.5.1 - February 3, 2011 + Updated and distributed by Glenn Randers-Pehrson + Copyright (c) 1998-2011 Glenn Randers-Pehrson + + libpng 1.0 beta 6 version 0.96 May 28, 1997 + Updated and distributed by Andreas Dilger + Copyright (c) 1996, 1997 Andreas Dilger + + libpng 1.0 beta 2 - version 0.88 January 26, 1996 + For conditions of distribution and use, see copyright + notice in png.h. Copyright (c) 1995, 1996 Guy Eric + Schalnat, Group 42, Inc. + + Updated/rewritten per request in the libpng FAQ + Copyright (c) 1995, 1996 Frank J. T. Wojcik + December 18, 1995 & January 20, 1996 + +I. Introduction + +This file describes how to use and modify the PNG reference library +(known as libpng) for your own use. There are five sections to this +file: introduction, structures, reading, writing, and modification and +configuration notes for various special platforms. In addition to this +file, example.c is a good starting point for using the library, as +it is heavily commented and should include everything most people +will need. We assume that libpng is already installed; see the +INSTALL file for instructions on how to install libpng. + +For examples of libpng usage, see the files "example.c", "pngtest.c", +and the files in the "contrib" directory, all of which are included in +the libpng distribution. + +Libpng was written as a companion to the PNG specification, as a way +of reducing the amount of time and effort it takes to support the PNG +file format in application programs. + +The PNG specification (second edition), November 2003, is available as +a W3C Recommendation and as an ISO Standard (ISO/IEC 15948:2003 (E)) at +. It is technically equivalent +to the PNG specification (second edition) but has some additional material. + +The PNG-1.0 specification is available +as RFC 2083 and as a +W3C Recommendation . + +Some additional chunks are described in the special-purpose public chunks +documents at . + +Other information +about PNG, and the latest version of libpng, can be found at the PNG home +page, . + +Most users will not have to modify the library significantly; advanced +users may want to modify it more. All attempts were made to make it as +complete as possible, while keeping the code easy to understand. +Currently, this library only supports C. Support for other languages +is being considered. + +Libpng has been designed to handle multiple sessions at one time, +to be easily modifiable, to be portable to the vast majority of +machines (ANSI, K&R, 16-, 32-, and 64-bit) available, and to be easy +to use. The ultimate goal of libpng is to promote the acceptance of +the PNG file format in whatever way possible. While there is still +work to be done (see the TODO file), libpng should cover the +majority of the needs of its users. + +Libpng uses zlib for its compression and decompression of PNG files. +Further information about zlib, and the latest version of zlib, can +be found at the zlib home page, . +The zlib compression utility is a general purpose utility that is +useful for more than PNG files, and can be used without libpng. +See the documentation delivered with zlib for more details. +You can usually find the source files for the zlib utility wherever you +find the libpng source files. + +Libpng is thread safe, provided the threads are using different +instances of the structures. Each thread should have its own +png_struct and png_info instances, and thus its own image. +Libpng does not protect itself against two threads using the +same instance of a structure. + +II. Structures + +There are two main structures that are important to libpng, png_struct +and png_info. Both are internal structures that are no longer exposed +in the libpng interface (as of libpng 1.5.0). + +The png_info structure is designed to provide information about the +PNG file. At one time, the fields of png_info were intended to be +directly accessible to the user. However, this tended to cause problems +with applications using dynamically loaded libraries, and as a result +a set of interface functions for png_info (the png_get_*() and png_set_*() +functions) was developed. + +The png_struct structure is the object used by the library to decode a +single image. As of 1.5.0 this structure is also not exposed. + +Almost all libpng APIs require a pointer to a png_struct as the first argument. +Many (in particular the png_set and png_get APIs) also require a pointer +to png_info as the second argument. Some application visible macros +defined in png.h designed for basic data access (reading and writing +integers in the PNG format) break this rule, but it's almost always safe +to assume that a (png_struct*) has to be passed to call an API function. + +The png.h header file is an invaluable reference for programming with libpng. +And while I'm on the topic, make sure you include the libpng header file: + +#include + +Types + +The png.h header file defines a number of integral types used by the +APIs. Most of these are fairly obvious; for example types corresponding +to integers of particular sizes and types for passing color values. + +One exception is how non-integral numbers are handled. For application +convenience most APIs that take such numbers have C (double) arguments, +however internally PNG, and libpng, use 32 bit signed integers and encode +the value by multiplying by 100,000. As of libpng 1.5.0 a convenience +macro PNG_FP_1 is defined in png.h along with a type (png_fixed_point) +which is simply (png_int_32). + +All APIs that take (double) arguments also have an matching API that +takes the corresponding fixed point integer arguments. The fixed point +API has the same name as the floating point one with _fixed appended. +The actual range of values permitted in the APIs is frequently less than +the full range of (png_fixed_point) (-21474 to +21474). When APIs require +a non-negative argument the type is recorded as png_uint_32 above. Consult +the header file and the text below for more information. + +Special care must be take with sCAL chunk handling because the chunk itself +uses non-integral values encoded as strings containing decimal floating point +numbers. See the comments in the header file. + +Configuration + +The main header file function declarations are frequently protected by C +preprocessing directives of the form: + + #ifdef PNG_feature_SUPPORTED + declare-function + #endif + +The library can be built without support for these APIs, although a +standard build will have all implemented APIs. Application programs +should check the feature macros before using an API for maximum +portability. From libpng 1.5.0 the feature macros set during the build +of libpng are recorded in the header file "pnglibconf.h" and this file +is always included by png.h. + +If you don't need to change the library configuration from the default skip to +the next section ("Reading"). + +Notice that some of the makefiles in the 'scripts' directory and (in 1.5.0) all +of the build project files in the 'projects' directory simply copy +scripts/pnglibconf.h.prebuilt to pnglibconf.h. This means that these build +systems do not permit easy auto-configuration of the library - they only +support the default configuration. + +The easiest way to make minor changes to the libpng configuration when +auto-configuration is supported is to add definitions to the command line +using (typically) CPPFLAGS. For example: + +CPPFLAGS=-DPNG_NO_FLOATING_ARITHMETIC + +will change the internal libpng math implementation for gamma correction and +other arithmetic calculations to fixed point, avoiding the need for fast +floating point support. The result can be seen in the generated pnglibconf.h - +make sure it contains the changed feature macro setting. + +If you need to make more extensive configuration changes - more than one or two +feature macro settings - you can either add -DPNG_USER_CONFIG to the build +command line and put a list of feature macro settings in pngusr.h or you can set +DFA_XTRA (a makefile variable) to a file containing the same information in the +form of 'option' settings. + +A. Changing pnglibconf.h + +A variety of methods exist to build libpng. Not all of these support +reconfiguration of pnglibconf.h. To reconfigure pnglibconf.h it must either be +rebuilt from scripts/pnglibconf.dfa using awk or it must be edited by hand. + +Hand editing is achieved by copying scripts/pnglibconf.h.prebuilt and changing +the lines defining the supported features, paying very close attention to the +'option' information in scripts/pnglibconf.dfa that describes those features and +their requirements. This is easy to get wrong. + +B. Configuration using DFA_XTRA + +Rebuilding from pnglibconf.dfa is easy if a functioning 'awk', or a later +variant such as 'nawk' or 'gawk', is available. The configure build will +automatically find an appropriate awk and build pnglibconf.h. +scripts/pnglibconf.mak contains a set of make rules for doing the same thing if +configure is not used, and many of the makefiles in the scripts directory use +this approach. + +When rebuilding simply write new file containing changed options and set +DFA_XTRA to the name of this file. This causes the build to append the new file +to the end of scripts/pnglibconf.dfa. pngusr.dfa should contain lines of the +following forms: + +everything = off + +This turns all optional features off. Include it at the start of pngusr.dfa to +make it easier to build a minimal configuration. You will need to turn at least +some features on afterward to enable either reading or writing code, or both. + +option feature on +option feature off + +Enable or disable a single feature. This will automatically enable other +features required by a feature that is turned on or disable other features that +require a feature which is turned off. Conflicting settings will cause an error +message to be emitted by awk. + +setting feature default value + +Changes the default value of setting 'feature' to 'value'. There are a small +number of settings listed at the top of pnglibconf.h, they are documented in the +source code. Most of these values have performance implications for the library +but most of them have no visible effect on the API. Some can also be overridden +from the API. + +C. Configuration using PNG_USR_CONFIG + +If -DPNG_USR_CONFIG is added to the CFLAGS when pnglibconf.h is built the file +pngusr.h will automatically be included before the options in +scripts/pnglibconf.dfa are processed. pngusr.h should contain only macro +definitions turning features on or off or setting settings. + +Apart from the global setting "everything = off" all the options listed above +can be set using macros in pngusr.h: + +#define PNG_feature_SUPPORTED + +is equivalent to: + +option feature on + +#define PNG_NO_feature + +is equivalent to: + +option feature off + +#define PNG_feature value + +is equivalent to: + +setting feature default value + +Notice that in both cases, pngusr.dfa and pngusr.h, the contents of the +pngusr file you supply override the contents of scripts/pnglibconf.dfa + +If confusing or incomprehensible behavior results it is possible to +examine the intermediate file pnglibconf.dfn to find the full set of +dependency information for each setting and option. Simply locate the +feature in the file and read the C comments that precede it. + +III. Reading + +We'll now walk you through the possible functions to call when reading +in a PNG file sequentially, briefly explaining the syntax and purpose +of each one. See example.c and png.h for more detail. While +progressive reading is covered in the next section, you will still +need some of the functions discussed in this section to read a PNG +file. + +Setup + +You will want to do the I/O initialization(*) before you get into libpng, +so if it doesn't work, you don't have much to undo. Of course, you +will also want to insure that you are, in fact, dealing with a PNG +file. Libpng provides a simple check to see if a file is a PNG file. +To use it, pass in the first 1 to 8 bytes of the file to the function +png_sig_cmp(), and it will return 0 (false) if the bytes match the +corresponding bytes of the PNG signature, or nonzero (true) otherwise. +Of course, the more bytes you pass in, the greater the accuracy of the +prediction. + +If you are intending to keep the file pointer open for use in libpng, +you must ensure you don't read more than 8 bytes from the beginning +of the file, and you also have to make a call to png_set_sig_bytes_read() +with the number of bytes you read from the beginning. Libpng will +then only check the bytes (if any) that your program didn't read. + +(*): If you are not using the standard I/O functions, you will need +to replace them with custom functions. See the discussion under +Customizing libpng. + + + FILE *fp = fopen(file_name, "rb"); + if (!fp) + { + return (ERROR); + } + + fread(header, 1, number, fp); + is_png = !png_sig_cmp(header, 0, number); + + if (!is_png) + { + return (NOT_PNG); + } + + +Next, png_struct and png_info need to be allocated and initialized. In +order to ensure that the size of these structures is correct even with a +dynamically linked libpng, there are functions to initialize and +allocate the structures. We also pass the library version, optional +pointers to error handling functions, and a pointer to a data struct for +use by the error functions, if necessary (the pointer and functions can +be NULL if the default error handlers are to be used). See the section +on Changes to Libpng below regarding the old initialization functions. +The structure allocation functions quietly return NULL if they fail to +create the structure, so your application should check for that. + + png_structp png_ptr = png_create_read_struct + (PNG_LIBPNG_VER_STRING, (png_voidp)user_error_ptr, + user_error_fn, user_warning_fn); + + if (!png_ptr) + return (ERROR); + + png_infop info_ptr = png_create_info_struct(png_ptr); + + if (!info_ptr) + { + png_destroy_read_struct(&png_ptr, + (png_infopp)NULL, (png_infopp)NULL); + return (ERROR); + } + + png_infop end_info = png_create_info_struct(png_ptr); + + if (!end_info) + { + png_destroy_read_struct(&png_ptr, &info_ptr, + (png_infopp)NULL); + return (ERROR); + } + +If you want to use your own memory allocation routines, +use a libpng that was built with PNG_USER_MEM_SUPPORTED defined, and use +png_create_read_struct_2() instead of png_create_read_struct(): + + png_structp png_ptr = png_create_read_struct_2 + (PNG_LIBPNG_VER_STRING, (png_voidp)user_error_ptr, + user_error_fn, user_warning_fn, (png_voidp) + user_mem_ptr, user_malloc_fn, user_free_fn); + +The error handling routines passed to png_create_read_struct() +and the memory alloc/free routines passed to png_create_struct_2() +are only necessary if you are not using the libpng supplied error +handling and memory alloc/free functions. + +When libpng encounters an error, it expects to longjmp back +to your routine. Therefore, you will need to call setjmp and pass +your png_jmpbuf(png_ptr). If you read the file from different +routines, you will need to update the jmpbuf field every time you enter +a new routine that will call a png_*() function. + +See your documentation of setjmp/longjmp for your compiler for more +information on setjmp/longjmp. See the discussion on libpng error +handling in the Customizing Libpng section below for more information +on the libpng error handling. If an error occurs, and libpng longjmp's +back to your setjmp, you will want to call png_destroy_read_struct() to +free any memory. + + if (setjmp(png_jmpbuf(png_ptr))) + { + png_destroy_read_struct(&png_ptr, &info_ptr, + &end_info); + fclose(fp); + return (ERROR); + } + +If you would rather avoid the complexity of setjmp/longjmp issues, +you can compile libpng with PNG_NO_SETJMP, in which case +errors will result in a call to PNG_ABORT() which defaults to abort(). + +You can #define PNG_ABORT() to a function that does something +more useful than abort(), as long as your function does not +return. + +Now you need to set up the input code. The default for libpng is to +use the C function fread(). If you use this, you will need to pass a +valid FILE * in the function png_init_io(). Be sure that the file is +opened in binary mode. If you wish to handle reading data in another +way, you need not call the png_init_io() function, but you must then +implement the libpng I/O methods discussed in the Customizing Libpng +section below. + + png_init_io(png_ptr, fp); + +If you had previously opened the file and read any of the signature from +the beginning in order to see if this was a PNG file, you need to let +libpng know that there are some bytes missing from the start of the file. + + png_set_sig_bytes(png_ptr, number); + +You can change the zlib compression buffer size to be used while +reading compressed data with + + png_set_compression_buffer_size(png_ptr, buffer_size); + +where the default size is 8192 bytes. Note that the buffer size +is changed immediately and the buffer is reallocated immediately, +instead of setting a flag to be acted upon later. + +If you want CRC errors to be handled in a different manner than +the default, use + + png_set_crc_action(png_ptr, crit_action, ancil_action); + +The values for png_set_crc_action() say how libpng is to handle CRC errors in +ancillary and critical chunks, and whether to use the data contained +therein. Note that it is impossible to "discard" data in a critical +chunk. + +Choices for (int) crit_action are + PNG_CRC_DEFAULT 0 error/quit + PNG_CRC_ERROR_QUIT 1 error/quit + PNG_CRC_WARN_USE 3 warn/use data + PNG_CRC_QUIET_USE 4 quiet/use data + PNG_CRC_NO_CHANGE 5 use the current value + +Choices for (int) ancil_action are + PNG_CRC_DEFAULT 0 error/quit + PNG_CRC_ERROR_QUIT 1 error/quit + PNG_CRC_WARN_DISCARD 2 warn/discard data + PNG_CRC_WARN_USE 3 warn/use data + PNG_CRC_QUIET_USE 4 quiet/use data + PNG_CRC_NO_CHANGE 5 use the current value + +Setting up callback code + +You can set up a callback function to handle any unknown chunks in the +input stream. You must supply the function + + read_chunk_callback(png_structp png_ptr, + png_unknown_chunkp chunk); + { + /* The unknown chunk structure contains your + chunk data, along with similar data for any other + unknown chunks: */ + + png_byte name[5]; + png_byte *data; + png_size_t size; + + /* Note that libpng has already taken care of + the CRC handling */ + + /* put your code here. Search for your chunk in the + unknown chunk structure, process it, and return one + of the following: */ + + return (-n); /* chunk had an error */ + return (0); /* did not recognize */ + return (n); /* success */ + } + +(You can give your function another name that you like instead of +"read_chunk_callback") + +To inform libpng about your function, use + + png_set_read_user_chunk_fn(png_ptr, user_chunk_ptr, + read_chunk_callback); + +This names not only the callback function, but also a user pointer that +you can retrieve with + + png_get_user_chunk_ptr(png_ptr); + +If you call the png_set_read_user_chunk_fn() function, then all unknown +chunks will be saved when read, in case your callback function will need +one or more of them. This behavior can be changed with the +png_set_keep_unknown_chunks() function, described below. + +At this point, you can set up a callback function that will be +called after each row has been read, which you can use to control +a progress meter or the like. It's demonstrated in pngtest.c. +You must supply a function + + void read_row_callback(png_structp png_ptr, + png_uint_32 row, int pass); + { + /* put your code here */ + } + +(You can give it another name that you like instead of "read_row_callback") + +To inform libpng about your function, use + + png_set_read_status_fn(png_ptr, read_row_callback); + +Unknown-chunk handling + +Now you get to set the way the library processes unknown chunks in the +input PNG stream. Both known and unknown chunks will be read. Normal +behavior is that known chunks will be parsed into information in +various info_ptr members while unknown chunks will be discarded. This +behavior can be wasteful if your application will never use some known +chunk types. To change this, you can call: + + png_set_keep_unknown_chunks(png_ptr, keep, + chunk_list, num_chunks); + keep - 0: default unknown chunk handling + 1: ignore; do not keep + 2: keep only if safe-to-copy + 3: keep even if unsafe-to-copy + + You can use these definitions: + PNG_HANDLE_CHUNK_AS_DEFAULT 0 + PNG_HANDLE_CHUNK_NEVER 1 + PNG_HANDLE_CHUNK_IF_SAFE 2 + PNG_HANDLE_CHUNK_ALWAYS 3 + + chunk_list - list of chunks affected (a byte string, + five bytes per chunk, NULL or '\0' if + num_chunks is 0) + + num_chunks - number of chunks affected; if 0, all + unknown chunks are affected. If nonzero, + only the chunks in the list are affected + +Unknown chunks declared in this way will be saved as raw data onto a +list of png_unknown_chunk structures. If a chunk that is normally +known to libpng is named in the list, it will be handled as unknown, +according to the "keep" directive. If a chunk is named in successive +instances of png_set_keep_unknown_chunks(), the final instance will +take precedence. The IHDR and IEND chunks should not be named in +chunk_list; if they are, libpng will process them normally anyway. + +Here is an example of the usage of png_set_keep_unknown_chunks(), +where the private "vpAg" chunk will later be processed by a user chunk +callback function: + + png_byte vpAg[5]={118, 112, 65, 103, (png_byte) '\0'}; + + #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) + png_byte unused_chunks[]= + { + 104, 73, 83, 84, (png_byte) '\0', /* hIST */ + 105, 84, 88, 116, (png_byte) '\0', /* iTXt */ + 112, 67, 65, 76, (png_byte) '\0', /* pCAL */ + 115, 67, 65, 76, (png_byte) '\0', /* sCAL */ + 115, 80, 76, 84, (png_byte) '\0', /* sPLT */ + 116, 73, 77, 69, (png_byte) '\0', /* tIME */ + }; + #endif + + ... + + #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) + /* ignore all unknown chunks: */ + png_set_keep_unknown_chunks(read_ptr, 1, NULL, 0); + + /* except for vpAg: */ + png_set_keep_unknown_chunks(read_ptr, 2, vpAg, 1); + + /* also ignore unused known chunks: */ + png_set_keep_unknown_chunks(read_ptr, 1, unused_chunks, + (int)sizeof(unused_chunks)/5); + #endif + +User limits + +The PNG specification allows the width and height of an image to be as +large as 2^31-1 (0x7fffffff), or about 2.147 billion rows and columns. +Since very few applications really need to process such large images, +we have imposed an arbitrary 1-million limit on rows and columns. +Larger images will be rejected immediately with a png_error() call. If +you wish to override this limit, you can use + + png_set_user_limits(png_ptr, width_max, height_max); + +to set your own limits, or use width_max = height_max = 0x7fffffffL +to allow all valid dimensions (libpng may reject some very large images +anyway because of potential buffer overflow conditions). + +You should put this statement after you create the PNG structure and +before calling png_read_info(), png_read_png(), or png_process_data(). +If you need to retrieve the limits that are being applied, use + + width_max = png_get_user_width_max(png_ptr); + height_max = png_get_user_height_max(png_ptr); + +The PNG specification sets no limit on the number of ancillary chunks +allowed in a PNG datastream. You can impose a limit on the total number +of sPLT, tEXt, iTXt, zTXt, and unknown chunks that will be stored, with + + png_set_chunk_cache_max(png_ptr, user_chunk_cache_max); + +where 0x7fffffffL means unlimited. You can retrieve this limit with + + chunk_cache_max = png_get_chunk_cache_max(png_ptr); + +This limit also applies to the number of buffers that can be allocated +by png_decompress_chunk() while decompressing iTXt, zTXt, and iCCP chunks. + +You can also set a limit on the amount of memory that a compressed chunk +other than IDAT can occupy, with + + png_set_chunk_malloc_max(png_ptr, user_chunk_malloc_max); + +and you can retrieve the limit with + + chunk_malloc_max = png_get_chunk_malloc_max(png_ptr); + +Any chunks that would cause either of these limits to be exceeded will +be ignored. + +The high-level read interface + +At this point there are two ways to proceed; through the high-level +read interface, or through a sequence of low-level read operations. +You can use the high-level interface if (a) you are willing to read +the entire image into memory, and (b) the input transformations +you want to do are limited to the following set: + + PNG_TRANSFORM_IDENTITY No transformation + PNG_TRANSFORM_STRIP_16 Strip 16-bit samples to + 8 bits + PNG_TRANSFORM_STRIP_ALPHA Discard the alpha channel + PNG_TRANSFORM_PACKING Expand 1, 2 and 4-bit + samples to bytes + PNG_TRANSFORM_PACKSWAP Change order of packed + pixels to LSB first + PNG_TRANSFORM_EXPAND Perform set_expand() + PNG_TRANSFORM_INVERT_MONO Invert monochrome images + PNG_TRANSFORM_SHIFT Normalize pixels to the + sBIT depth + PNG_TRANSFORM_BGR Flip RGB to BGR, RGBA + to BGRA + PNG_TRANSFORM_SWAP_ALPHA Flip RGBA to ARGB or GA + to AG + PNG_TRANSFORM_INVERT_ALPHA Change alpha from opacity + to transparency + PNG_TRANSFORM_SWAP_ENDIAN Byte-swap 16-bit samples + PNG_TRANSFORM_GRAY_TO_RGB Expand grayscale samples + to RGB (or GA to RGBA) + +(This excludes setting a background color, doing gamma transformation, +quantizing, and setting filler.) If this is the case, simply do this: + + png_read_png(png_ptr, info_ptr, png_transforms, NULL) + +where png_transforms is an integer containing the bitwise OR of some +set of transformation flags. This call is equivalent to png_read_info(), +followed the set of transformations indicated by the transform mask, +then png_read_image(), and finally png_read_end(). + +(The final parameter of this call is not yet used. Someday it might point +to transformation parameters required by some future input transform.) + +You must use png_transforms and not call any png_set_transform() functions +when you use png_read_png(). + +After you have called png_read_png(), you can retrieve the image data +with + + row_pointers = png_get_rows(png_ptr, info_ptr); + +where row_pointers is an array of pointers to the pixel data for each row: + + png_bytep row_pointers[height]; + +If you know your image size and pixel size ahead of time, you can allocate +row_pointers prior to calling png_read_png() with + + if (height > PNG_UINT_32_MAX/png_sizeof(png_byte)) + png_error (png_ptr, + "Image is too tall to process in memory"); + + if (width > PNG_UINT_32_MAX/pixel_size) + png_error (png_ptr, + "Image is too wide to process in memory"); + + row_pointers = png_malloc(png_ptr, + height*png_sizeof(png_bytep)); + + for (int i=0; i) and +png_get_(png_ptr, info_ptr, ...) functions return non-zero if the +data has been read, or zero if it is missing. The parameters to the +png_get_ are set directly if they are simple data types, or a +pointer into the info_ptr is returned for any complex types. + + png_get_PLTE(png_ptr, info_ptr, &palette, + &num_palette); + + palette - the palette for the file + (array of png_color) + + num_palette - number of entries in the palette + + png_get_gAMA(png_ptr, info_ptr, &file_gamma); + png_get_gAMA_fixed(png_ptr, info_ptr, &int_file_gamma); + + file_gamma - the gamma at which the file is + written (PNG_INFO_gAMA) + + int_file_gamma - 100,000 times the gamma at which the + file is written + + png_get_sRGB(png_ptr, info_ptr, &srgb_intent); + + file_srgb_intent - the rendering intent (PNG_INFO_sRGB) + The presence of the sRGB chunk + means that the pixel data is in the + sRGB color space. This chunk also + implies specific values of gAMA and + cHRM. + + png_get_iCCP(png_ptr, info_ptr, &name, + &compression_type, &profile, &proflen); + + name - The profile name. + + compression_type - The compression type; always + PNG_COMPRESSION_TYPE_BASE for PNG 1.0. + You may give NULL to this argument to + ignore it. + + profile - International Color Consortium color + profile data. May contain NULs. + + proflen - length of profile data in bytes. + + png_get_sBIT(png_ptr, info_ptr, &sig_bit); + + sig_bit - the number of significant bits for + (PNG_INFO_sBIT) each of the gray, + red, green, and blue channels, + whichever are appropriate for the + given color type (png_color_16) + + png_get_tRNS(png_ptr, info_ptr, &trans_alpha, + &num_trans, &trans_color); + + trans_alpha - array of alpha (transparency) + entries for palette (PNG_INFO_tRNS) + + num_trans - number of transparent entries + (PNG_INFO_tRNS) + + trans_color - graylevel or color sample values of + the single transparent color for + non-paletted images (PNG_INFO_tRNS) + + png_get_hIST(png_ptr, info_ptr, &hist); + (PNG_INFO_hIST) + + hist - histogram of palette (array of + png_uint_16) + + png_get_tIME(png_ptr, info_ptr, &mod_time); + + mod_time - time image was last modified + (PNG_VALID_tIME) + + png_get_bKGD(png_ptr, info_ptr, &background); + + background - background color (PNG_VALID_bKGD) + valid 16-bit red, green and blue + values, regardless of color_type + + num_comments = png_get_text(png_ptr, info_ptr, + &text_ptr, &num_text); + + num_comments - number of comments + + text_ptr - array of png_text holding image + comments + + text_ptr[i].compression - type of compression used + on "text" PNG_TEXT_COMPRESSION_NONE + PNG_TEXT_COMPRESSION_zTXt + PNG_ITXT_COMPRESSION_NONE + PNG_ITXT_COMPRESSION_zTXt + + text_ptr[i].key - keyword for comment. Must contain + 1-79 characters. + + text_ptr[i].text - text comments for current + keyword. Can be empty. + + text_ptr[i].text_length - length of text string, + after decompression, 0 for iTXt + + text_ptr[i].itxt_length - length of itxt string, + after decompression, 0 for tEXt/zTXt + + text_ptr[i].lang - language of comment (empty + string for unknown). + + text_ptr[i].lang_key - keyword in UTF-8 + (empty string for unknown). + + Note that the itxt_length, lang, and lang_key + members of the text_ptr structure only exist + when the library is built with iTXt chunk support. + + num_text - number of comments (same as + num_comments; you can put NULL here + to avoid the duplication) + + Note while png_set_text() will accept text, language, + and translated keywords that can be NULL pointers, the + structure returned by png_get_text will always contain + regular zero-terminated C strings. They might be + empty strings but they will never be NULL pointers. + + num_spalettes = png_get_sPLT(png_ptr, info_ptr, + &palette_ptr); + + num_spalettes - number of sPLT chunks read. + + palette_ptr - array of palette structures holding + contents of one or more sPLT chunks + read. + + png_get_oFFs(png_ptr, info_ptr, &offset_x, &offset_y, + &unit_type); + + offset_x - positive offset from the left edge + of the screen + + offset_y - positive offset from the top edge + of the screen + + unit_type - PNG_OFFSET_PIXEL, PNG_OFFSET_MICROMETER + + png_get_pHYs(png_ptr, info_ptr, &res_x, &res_y, + &unit_type); + + res_x - pixels/unit physical resolution in + x direction + + res_y - pixels/unit physical resolution in + x direction + + unit_type - PNG_RESOLUTION_UNKNOWN, + PNG_RESOLUTION_METER + + png_get_sCAL(png_ptr, info_ptr, &unit, &width, + &height) + + unit - physical scale units (an integer) + + width - width of a pixel in physical scale units + + height - height of a pixel in physical scale units + (width and height are doubles) + + png_get_sCAL_s(png_ptr, info_ptr, &unit, &width, + &height) + + unit - physical scale units (an integer) + + width - width of a pixel in physical scale units + + height - height of a pixel in physical scale units + (width and height are strings like "2.54") + + num_unknown_chunks = png_get_unknown_chunks(png_ptr, + info_ptr, &unknowns) + + unknowns - array of png_unknown_chunk + structures holding unknown chunks + + unknowns[i].name - name of unknown chunk + + unknowns[i].data - data of unknown chunk + + unknowns[i].size - size of unknown chunk's data + + unknowns[i].location - position of chunk in file + + The value of "i" corresponds to the order in which the + chunks were read from the PNG file or inserted with the + png_set_unknown_chunks() function. + +The data from the pHYs chunk can be retrieved in several convenient +forms: + + res_x = png_get_x_pixels_per_meter(png_ptr, + info_ptr) + + res_y = png_get_y_pixels_per_meter(png_ptr, + info_ptr) + + res_x_and_y = png_get_pixels_per_meter(png_ptr, + info_ptr) + + res_x = png_get_x_pixels_per_inch(png_ptr, + info_ptr) + + res_y = png_get_y_pixels_per_inch(png_ptr, + info_ptr) + + res_x_and_y = png_get_pixels_per_inch(png_ptr, + info_ptr) + + aspect_ratio = png_get_pixel_aspect_ratio(png_ptr, + info_ptr) + + Each of these returns 0 [signifying "unknown"] if + the data is not present or if res_x is 0; + res_x_and_y is 0 if res_x != res_y + + Note that because of the way the resolutions are + stored internally, the inch conversions won't + come out to exactly even number. For example, + 72 dpi is stored as 0.28346 pixels/meter, and + when this is retrieved it is 71.9988 dpi, so + be sure to round the returned value appropriately + if you want to display a reasonable-looking result. + +The data from the oFFs chunk can be retrieved in several convenient +forms: + + x_offset = png_get_x_offset_microns(png_ptr, info_ptr); + + y_offset = png_get_y_offset_microns(png_ptr, info_ptr); + + x_offset = png_get_x_offset_inches(png_ptr, info_ptr); + + y_offset = png_get_y_offset_inches(png_ptr, info_ptr); + + Each of these returns 0 [signifying "unknown" if both + x and y are 0] if the data is not present or if the + chunk is present but the unit is the pixel. The + remark about inexact inch conversions applies here + as well, because a value in inches can't always be + converted to microns and back without some loss + of precision. + +For more information, see the png_info definition in png.h and the +PNG specification for chunk contents. Be careful with trusting +rowbytes, as some of the transformations could increase the space +needed to hold a row (expand, filler, gray_to_rgb, etc.). +See png_read_update_info(), below. + +A quick word about text_ptr and num_text. PNG stores comments in +keyword/text pairs, one pair per chunk, with no limit on the number +of text chunks, and a 2^31 byte limit on their size. While there are +suggested keywords, there is no requirement to restrict the use to these +strings. It is strongly suggested that keywords and text be sensible +to humans (that's the point), so don't use abbreviations. Non-printing +symbols are not allowed. See the PNG specification for more details. +There is also no requirement to have text after the keyword. + +Keywords should be limited to 79 Latin-1 characters without leading or +trailing spaces, but non-consecutive spaces are allowed within the +keyword. It is possible to have the same keyword any number of times. +The text_ptr is an array of png_text structures, each holding a +pointer to a language string, a pointer to a keyword and a pointer to +a text string. The text string, language code, and translated +keyword may be empty or NULL pointers. The keyword/text +pairs are put into the array in the order that they are received. +However, some or all of the text chunks may be after the image, so, to +make sure you have read all the text chunks, don't mess with these +until after you read the stuff after the image. This will be +mentioned again below in the discussion that goes with png_read_end(). + +Input transformations + +After you've read the header information, you can set up the library +to handle any special transformations of the image data. The various +ways to transform the data will be described in the order that they +should occur. This is important, as some of these change the color +type and/or bit depth of the data, and some others only work on +certain color types and bit depths. Even though each transformation +checks to see if it has data that it can do something with, you should +make sure to only enable a transformation if it will be valid for the +data. For example, don't swap red and blue on grayscale data. + +The colors used for the background and transparency values should be +supplied in the same format/depth as the current image data. They +are stored in the same format/depth as the image data in a bKGD or tRNS +chunk, so this is what libpng expects for this data. The colors are +transformed to keep in sync with the image data when an application +calls the png_read_update_info() routine (see below). + +Data will be decoded into the supplied row buffers packed into bytes +unless the library has been told to transform it into another format. +For example, 4 bit/pixel paletted or grayscale data will be returned +2 pixels/byte with the leftmost pixel in the high-order bits of the +byte, unless png_set_packing() is called. 8-bit RGB data will be stored +in RGB RGB RGB format unless png_set_filler() or png_set_add_alpha() +is called to insert filler bytes, either before or after each RGB triplet. +16-bit RGB data will be returned RRGGBB RRGGBB, with the most significant +byte of the color value first, unless png_set_strip_16() is called to +transform it to regular RGB RGB triplets, or png_set_filler() or +png_set_add alpha() is called to insert filler bytes, either before or +after each RRGGBB triplet. Similarly, 8-bit or 16-bit grayscale data can +be modified with +png_set_filler(), png_set_add_alpha(), or png_set_strip_16(). + +The following code transforms grayscale images of less than 8 to 8 bits, +changes paletted images to RGB, and adds a full alpha channel if there is +transparency information in a tRNS chunk. This is most useful on +grayscale images with bit depths of 2 or 4 or if there is a multiple-image +viewing application that wishes to treat all images in the same way. + + if (color_type == PNG_COLOR_TYPE_PALETTE) + png_set_palette_to_rgb(png_ptr); + + if (color_type == PNG_COLOR_TYPE_GRAY && + bit_depth < 8) png_set_expand_gray_1_2_4_to_8(png_ptr); + + if (png_get_valid(png_ptr, info_ptr, + PNG_INFO_tRNS)) png_set_tRNS_to_alpha(png_ptr); + +These three functions are actually aliases for png_set_expand(), added +in libpng version 1.0.4, with the function names expanded to improve code +readability. In some future version they may actually do different +things. + +As of libpng version 1.2.9, png_set_expand_gray_1_2_4_to_8() was +added. It expands the sample depth without changing tRNS to alpha. + +As of libpng version 1.5.1, not all possible expansions are supported. + +In the following table, the 01 means grayscale with depth<8, 31 means +indexed with depth<8, other numerals represent the color type, "T" means +the tRNS chunk is present, A means an alpha channel is present, and O +means tRNS or alpha is present but all pixels in the image are opaque. + + FROM 01 31 0 0T 0O 2 2T 2O 3 3T 3O 4A 4O 6A 6O + TO + 01 - + 31 - + 0 1 - + 0T - + 0O - + 2 GX - + 2T - + 2O - + 3 1 - + 3T - + 3O - + 4A T - + 4O - + 6A GX TX TX - + 6O GX TX - + +Within the matrix, + "-" means the transformation is not supported. + "X" means the transformation is obtained by png_set_expand(). + "1" means the transformation is obtained by + png_set_expand_gray_1_2_4_to_8 + "G" means the transformation is obtained by + png_set_gray_to_rgb(). + "P" means the transformation is obtained by + png_set_expand_palette_to_rgb(). + "T" means the transformation is obtained by + png_set_tRNS_to_alpha(). + +PNG can have files with 16 bits per channel. If you only can handle +8 bits per channel, this will strip the pixels down to 8 bit. + + if (bit_depth == 16) + png_set_strip_16(png_ptr); + +If, for some reason, you don't need the alpha channel on an image, +and you want to remove it rather than combining it with the background +(but the image author certainly had in mind that you *would* combine +it with the background, so that's what you should probably do): + + if (color_type & PNG_COLOR_MASK_ALPHA) + png_set_strip_alpha(png_ptr); + +In PNG files, the alpha channel in an image +is the level of opacity. If you need the alpha channel in an image to +be the level of transparency instead of opacity, you can invert the +alpha channel (or the tRNS chunk data) after it's read, so that 0 is +fully opaque and 255 (in 8-bit or paletted images) or 65535 (in 16-bit +images) is fully transparent, with + + png_set_invert_alpha(png_ptr); + +PNG files pack pixels of bit depths 1, 2, and 4 into bytes as small as +they can, resulting in, for example, 8 pixels per byte for 1 bit +files. This code expands to 1 pixel per byte without changing the +values of the pixels: + + if (bit_depth < 8) + png_set_packing(png_ptr); + +PNG files have possible bit depths of 1, 2, 4, 8, and 16. All pixels +stored in a PNG image have been "scaled" or "shifted" up to the next +higher possible bit depth (e.g. from 5 bits/sample in the range [0,31] +to 8 bits/sample in the range [0, 255]). However, it is also possible +to convert the PNG pixel data back to the original bit depth of the +image. This call reduces the pixels back down to the original bit depth: + + png_color_8p sig_bit; + + if (png_get_sBIT(png_ptr, info_ptr, &sig_bit)) + png_set_shift(png_ptr, sig_bit); + +PNG files store 3-color pixels in red, green, blue order. This code +changes the storage of the pixels to blue, green, red: + + if (color_type == PNG_COLOR_TYPE_RGB || + color_type == PNG_COLOR_TYPE_RGB_ALPHA) + png_set_bgr(png_ptr); + +PNG files store RGB pixels packed into 3 or 6 bytes. This code expands them +into 4 or 8 bytes for windowing systems that need them in this format: + + if (color_type == PNG_COLOR_TYPE_RGB) + png_set_filler(png_ptr, filler, PNG_FILLER_BEFORE); + +where "filler" is the 8 or 16-bit number to fill with, and the location is +either PNG_FILLER_BEFORE or PNG_FILLER_AFTER, depending upon whether +you want the filler before the RGB or after. This transformation +does not affect images that already have full alpha channels. To add an +opaque alpha channel, use filler=0xff or 0xffff and PNG_FILLER_AFTER which +will generate RGBA pixels. + +Note that png_set_filler() does not change the color type. If you want +to do that, you can add a true alpha channel with + + if (color_type == PNG_COLOR_TYPE_RGB || + color_type == PNG_COLOR_TYPE_GRAY) + png_set_add_alpha(png_ptr, filler, PNG_FILLER_AFTER); + +where "filler" contains the alpha value to assign to each pixel. +This function was added in libpng-1.2.7. + +If you are reading an image with an alpha channel, and you need the +data as ARGB instead of the normal PNG format RGBA: + + if (color_type == PNG_COLOR_TYPE_RGB_ALPHA) + png_set_swap_alpha(png_ptr); + +For some uses, you may want a grayscale image to be represented as +RGB. This code will do that conversion: + + if (color_type == PNG_COLOR_TYPE_GRAY || + color_type == PNG_COLOR_TYPE_GRAY_ALPHA) + png_set_gray_to_rgb(png_ptr); + +Conversely, you can convert an RGB or RGBA image to grayscale or grayscale +with alpha. + + if (color_type == PNG_COLOR_TYPE_RGB || + color_type == PNG_COLOR_TYPE_RGB_ALPHA) + png_set_rgb_to_gray_fixed(png_ptr, error_action, + int red_weight, int green_weight); + + error_action = 1: silently do the conversion + + error_action = 2: issue a warning if the original + image has any pixel where + red != green or red != blue + + error_action = 3: issue an error and abort the + conversion if the original + image has any pixel where + red != green or red != blue + + red_weight: weight of red component times 100000 + + green_weight: weight of green component times 100000 + If either weight is negative, default + weights (21268, 71514) are used. + +If you have set error_action = 1 or 2, you can +later check whether the image really was gray, after processing +the image rows, with the png_get_rgb_to_gray_status(png_ptr) function. +It will return a png_byte that is zero if the image was gray or +1 if there were any non-gray pixels. bKGD and sBIT data +will be silently converted to grayscale, using the green channel +data, regardless of the error_action setting. + +With red_weight+green_weight<=100000, +the normalized graylevel is computed: + + int rw = red_weight * 65536; + int gw = green_weight * 65536; + int bw = 65536 - (rw + gw); + gray = (rw*red + gw*green + bw*blue)/65536; + +The default values approximate those recommended in the Charles +Poynton's Color FAQ, +Copyright (c) 1998-01-04 Charles Poynton + + Y = 0.212671 * R + 0.715160 * G + 0.072169 * B + +Libpng approximates this with integers scaled by 32768: + + Y = (6968 * R + 23434 * G + 2366 * B)/32768 + +The calculation is done in a linear colorspace, if the image gamma +can be determined. + +If you have a grayscale and you are using png_set_expand_depth(), +png_set_expand(), or png_set_gray_to_rgb to change to truecolor or to +a higher bit-depth, you must either supply the background color as a gray +value at the original file bit-depth (need_expand = 1) or else supply the +background color as an RGB triplet at the final, expanded bit depth +(need_expand = 0). Similarly, if you are reading a paletted image, you +must either supply the background color as a palette index (need_expand = 1) +or as an RGB triplet that may or may not be in the palette (need_expand = 0). + + png_color_16 my_background; + png_color_16p image_background; + + if (png_get_bKGD(png_ptr, info_ptr, &image_background)) + png_set_background(png_ptr, image_background, + PNG_BACKGROUND_GAMMA_FILE, 1, 1.0); + else + png_set_background(png_ptr, &my_background, + PNG_BACKGROUND_GAMMA_SCREEN, 0, 1.0); + +The png_set_background() function tells libpng to composite images +with alpha or simple transparency against the supplied background +color. If the PNG file contains a bKGD chunk (PNG_INFO_bKGD valid), +you may use this color, or supply another color more suitable for +the current display (e.g., the background color from a web page). You +need to tell libpng whether the color is in the gamma space of the +display (PNG_BACKGROUND_GAMMA_SCREEN for colors you supply), the file +(PNG_BACKGROUND_GAMMA_FILE for colors from the bKGD chunk), or one +that is neither of these gammas (PNG_BACKGROUND_GAMMA_UNIQUE - I don't +know why anyone would use this, but it's here). + +To properly display PNG images on any kind of system, the application needs +to know what the display gamma is. Ideally, the user will know this, and +the application will allow them to set it. One method of allowing the user +to set the display gamma separately for each system is to check for a +SCREEN_GAMMA or DISPLAY_GAMMA environment variable, which will hopefully be +correctly set. + +Note that display_gamma is the overall gamma correction required to produce +pleasing results, which depends on the lighting conditions in the surrounding +environment. In a dim or brightly lit room, no compensation other than +the physical gamma exponent of the monitor is needed, while in a dark room +a slightly smaller exponent is better. + + double gamma, screen_gamma; + + if (/* We have a user-defined screen + gamma value */) + { + screen_gamma = user_defined_screen_gamma; + } + + /* One way that applications can share the same + screen gamma value */ + else if ((gamma_str = getenv("SCREEN_GAMMA")) + != NULL) + { + screen_gamma = (double)atof(gamma_str); + } + + /* If we don't have another value */ + else + { + screen_gamma = 2.2; /* A good guess for a + PC monitor in a bright office or a dim room */ + + screen_gamma = 2.0; /* A good guess for a + PC monitor in a dark room */ + + screen_gamma = 1.7 or 1.0; /* A good + guess for Mac systems */ + } + +The functions png_set_gamma() and its fixed point equivalent +png_set_gamma_fixed() handle gamma transformations of the data. +Pass both the file gamma and the current screen_gamma. If the file does +not have a gamma value, you can pass one anyway if you have an idea what +it is (usually 0.45455 is a good guess for GIF images on PCs). Note +that file gammas are inverted from screen gammas. See the discussions +on gamma in the PNG specification for an excellent description of what +gamma is, and why all applications should support it. It is strongly +recommended that PNG viewers support gamma correction. + + if (png_get_gAMA(png_ptr, info_ptr, &file_gamma)) + png_set_gamma(png_ptr, screen_gamma, file_gamma); + + else + png_set_gamma(png_ptr, screen_gamma, 0.45455); + +If you need to reduce an RGB file to a paletted file, or if a paletted +file has more entries then will fit on your screen, png_set_quantize() +will do that. Note that this is a simple match quantization that merely +finds the closest color available. This should work fairly well with +optimized palettes, but fairly badly with linear color cubes. If you +pass a palette that is larger then maximum_colors, the file will +reduce the number of colors in the palette so it will fit into +maximum_colors. If there is a histogram, it will use it to make +more intelligent choices when reducing the palette. If there is no +histogram, it may not do as good a job. + + if (color_type & PNG_COLOR_MASK_COLOR) + { + if (png_get_valid(png_ptr, info_ptr, + PNG_INFO_PLTE)) + { + png_uint_16p histogram = NULL; + + png_get_hIST(png_ptr, info_ptr, + &histogram); + png_set_quantize(png_ptr, palette, num_palette, + max_screen_colors, histogram, 1); + } + + else + { + png_color std_color_cube[MAX_SCREEN_COLORS] = + { ... colors ... }; + + png_set_quantize(png_ptr, std_color_cube, + MAX_SCREEN_COLORS, MAX_SCREEN_COLORS, + NULL,0); + } + } + +PNG files describe monochrome as black being zero and white being one. +The following code will reverse this (make black be one and white be +zero): + + if (bit_depth == 1 && color_type == PNG_COLOR_TYPE_GRAY) + png_set_invert_mono(png_ptr); + +This function can also be used to invert grayscale and gray-alpha images: + + if (color_type == PNG_COLOR_TYPE_GRAY || + color_type == PNG_COLOR_TYPE_GRAY_ALPHA) + png_set_invert_mono(png_ptr); + +PNG files store 16 bit pixels in network byte order (big-endian, +ie. most significant bits first). This code changes the storage to the +other way (little-endian, i.e. least significant bits first, the +way PCs store them): + + if (bit_depth == 16) + png_set_swap(png_ptr); + +If you are using packed-pixel images (1, 2, or 4 bits/pixel), and you +need to change the order the pixels are packed into bytes, you can use: + + if (bit_depth < 8) + png_set_packswap(png_ptr); + +Finally, you can write your own transformation function if none of +the existing ones meets your needs. This is done by setting a callback +with + + png_set_read_user_transform_fn(png_ptr, + read_transform_fn); + +You must supply the function + + void read_transform_fn(png_structp png_ptr, row_info_ptr + row_info, png_bytep data) + +See pngtest.c for a working example. Your function will be called +after all of the other transformations have been processed. Take care with +interlaced images if you do the interlace yourself - the width of the row is the +width in 'row_info', not the overall image width. + +If supported libpng provides two information routines that you can use to find +where you are in processing the image: + + png_get_current_pass_number(png_structp png_ptr); + png_get_current_row_number(png_structp png_ptr); + +Don't try using these outside a transform callback - firstly they are only +supported if user transforms are supported, secondly they may well return +unexpected results unless the row is actually being processed at the moment they +are called. + +You can also set up a pointer to a user structure for use by your +callback function, and you can inform libpng that your transform +function will change the number of channels or bit depth with the +function + + png_set_user_transform_info(png_ptr, user_ptr, + user_depth, user_channels); + +The user's application, not libpng, is responsible for allocating and +freeing any memory required for the user structure. + +You can retrieve the pointer via the function +png_get_user_transform_ptr(). For example: + + voidp read_user_transform_ptr = + png_get_user_transform_ptr(png_ptr); + +The last thing to handle is interlacing; this is covered in detail below, +but you must call the function here if you want libpng to handle expansion +of the interlaced image. + + number_of_passes = png_set_interlace_handling(png_ptr); + +After setting the transformations, libpng can update your png_info +structure to reflect any transformations you've requested with this +call. This is most useful to update the info structure's rowbytes +field so you can use it to allocate your image memory. This function +will also update your palette with the correct screen_gamma and +background if these have been given with the calls above. + + png_read_update_info(png_ptr, info_ptr); + +After you call png_read_update_info(), you can allocate any +memory you need to hold the image. The row data is simply +raw byte data for all forms of images. As the actual allocation +varies among applications, no example will be given. If you +are allocating one large chunk, you will need to build an +array of pointers to each row, as it will be needed for some +of the functions below. + +Remember: Before you call png_read_update_info(), the png_get_ +functions return the values corresponding to the original PNG image. +After you call png_read_update_info the values refer to the image +that libpng will output. Consequently you must call all the png_set_ +functions before you call png_read_update_info(). This is particularly +important for png_set_interlace_handling() - if you are going to call +png_read_update_info() you must call png_set_interlace_handling() before +it unless you want to receive interlaced output. + +Reading image data + +After you've allocated memory, you can read the image data. +The simplest way to do this is in one function call. If you are +allocating enough memory to hold the whole image, you can just +call png_read_image() and libpng will read in all the image data +and put it in the memory area supplied. You will need to pass in +an array of pointers to each row. + +This function automatically handles interlacing, so you don't +need to call png_set_interlace_handling() (unless you call +png_read_update_info()) or call this function multiple times, or any +of that other stuff necessary with png_read_rows(). + + png_read_image(png_ptr, row_pointers); + +where row_pointers is: + + png_bytep row_pointers[height]; + +You can point to void or char or whatever you use for pixels. + +If you don't want to read in the whole image at once, you can +use png_read_rows() instead. If there is no interlacing (check +interlace_type == PNG_INTERLACE_NONE), this is simple: + + png_read_rows(png_ptr, row_pointers, NULL, + number_of_rows); + +where row_pointers is the same as in the png_read_image() call. + +If you are doing this just one row at a time, you can do this with +a single row_pointer instead of an array of row_pointers: + + png_bytep row_pointer = row; + png_read_row(png_ptr, row_pointer, NULL); + +If the file is interlaced (interlace_type != 0 in the IHDR chunk), things +get somewhat harder. The only current (PNG Specification version 1.2) +interlacing type for PNG is (interlace_type == PNG_INTERLACE_ADAM7); +a somewhat complicated 2D interlace scheme, known as Adam7, that +breaks down an image into seven smaller images of varying size, based +on an 8x8 grid. This number is defined (from libpng 1.5) as +PNG_INTERLACE_ADAM7_PASSES in png.h + +libpng can fill out those images or it can give them to you "as is". +It is almost always better to have libpng handle the interlacing for you. +If you want the images filled out, there are two ways to do that. The one +mentioned in the PNG specification is to expand each pixel to cover +those pixels that have not been read yet (the "rectangle" method). +This results in a blocky image for the first pass, which gradually +smooths out as more pixels are read. The other method is the "sparkle" +method, where pixels are drawn only in their final locations, with the +rest of the image remaining whatever colors they were initialized to +before the start of the read. The first method usually looks better, +but tends to be slower, as there are more pixels to put in the rows. + +If, as is likely, you want libpng to expand the images, call this before +calling png_start_read_image() or png_read_update_info(): + + if (interlace_type == PNG_INTERLACE_ADAM7) + number_of_passes + = png_set_interlace_handling(png_ptr); + +This will return the number of passes needed. Currently, this is seven, +but may change if another interlace type is added. This function can be +called even if the file is not interlaced, where it will return one pass. +You then need to read the whole image 'number_of_passes' times. Each time +will distribute the pixels from the current pass to the correct place in +the output image, so you need to supply the same rows to png_read_rows in +each pass. + +If you are not going to display the image after each pass, but are +going to wait until the entire image is read in, use the sparkle +effect. This effect is faster and the end result of either method +is exactly the same. If you are planning on displaying the image +after each pass, the "rectangle" effect is generally considered the +better looking one. + +If you only want the "sparkle" effect, just call png_read_rows() as +normal, with the third parameter NULL. Make sure you make pass over +the image number_of_passes times, and you don't change the data in the +rows between calls. You can change the locations of the data, just +not the data. Each pass only writes the pixels appropriate for that +pass, and assumes the data from previous passes is still valid. + + png_read_rows(png_ptr, row_pointers, NULL, + number_of_rows); + +If you only want the first effect (the rectangles), do the same as +before except pass the row buffer in the third parameter, and leave +the second parameter NULL. + + png_read_rows(png_ptr, NULL, row_pointers, + number_of_rows); + +If you don't want libpng to handle the interlacing details, just call +png_read_rows() PNG_INTERLACE_ADAM7_PASSES times to read in all the images. +Each of the images is a valid image by itself, however you will almost +certainly need to distribute the pixels from each sub-image to the +correct place. This is where everything gets very tricky. + +If you want to retrieve the separate images you must pass the correct +number of rows to each successive call of png_read_rows(). The calculation +gets pretty complicated for small images, where some sub-images may +not even exist because either their width or height ends up zero. +libpng provides two macros to help you in 1.5 and later versions: + + png_uint_32 width = PNG_PASS_COLS(image_width, pass_number); + png_uint_32 height = PNG_PASS_ROWS(image_height, pass_number); + +Respectively these tell you the width and height of the sub-image +corresponding to the numbered pass. 'pass' is in in the range 0 to 6 - +this can be confusing because the specification refers to the same passes +as 1 to 7! Be careful, you must check both the width and height before +calling png_read_rows() and not call it for that pass if either is zero. + +You can, of course, read each sub-image row by row. If you want to +produce optimal code to make a pixel-by-pixel transformation of an +interlaced image this is the best approach; read each row of each pass, +transform it, and write it out to a new interlaced image. + +If you want to de-interlace the image yourself libpng provides further +macros to help that tell you where to place the pixels in the output image. +Because the interlacing scheme is rectangular - sub-image pixels are always +arranged on a rectangular grid - all you need to know for each pass is the +starting column and row in the output image of the first pixel plus the +spacing between each pixel. As of libpng 1.5 there are four macros to +retrieve this information: + + png_uint_32 x = PNG_PASS_START_COL(pass); + png_uint_32 y = PNG_PASS_START_ROW(pass); + png_uint_32 xStep = 1U << PNG_PASS_COL_SHIFT(pass); + png_uint_32 yStep = 1U << PNG_PASS_ROW_SHIFT(pass); + +These allow you to write the obvious loop: + + png_uint_32 input_y = 0; + png_uint_32 output_y = PNG_PASS_START_ROW(pass); + + while (output_y < output_image_height) + { + png_uint_32 input_x = 0; + png_uint_32 output_x = PNG_PASS_START_COL(pass); + + while (output_x < output_image_width) + { + image[output_y][output_x] = + subimage[pass][input_y][input_x++]; + + output_x += xStep; + } + + ++input_y; + output_y += yStep; + } + +Notice that the steps between successive output rows and columns are +returned as shifts. This is possible because the pixels in the subimages +are always a power of 2 apart - 1, 2, 4 or 8 pixels - in the original +image. In practice you may need to directly calculate the output coordinate +given an input coordinate. libpng provides two further macros for this +purpose: + + png_uint_32 output_x = PNG_COL_FROM_PASS_COL(input_x, pass); + png_uint_32 output_y = PNG_ROW_FROM_PASS_ROW(input_y, pass); + +Finally a pair of macros are provided to tell you if a particular image +row or column appears in a given pass: + + int col_in_pass = PNG_COL_IN_INTERLACE_PASS(output_x, pass); + int row_in_pass = PNG_ROW_IN_INTERLACE_PASS(output_y, pass); + +Bear in mind that you will probably also need to check the width and height +of the pass in addition to the above to be sure the pass even exists! + +With any luck you are convinced by now that you don't want to do your own +interlace handling. In reality normally the only good reason for doing this +is if you are processing PNG files on a pixel-by-pixel basis and don't want +to load the whole file into memory when it is interlaced. + +libpng includes a test program, pngvalid, that illustrates reading and +writing of interlaced images. If you can't get interlacing to work in your +code and don't want to leave it to libpng (the recommended approach) see +how pngvalid.c does it. + +Finishing a sequential read + +After you are finished reading the image through the +low-level interface, you can finish reading the file. If you are +interested in comments or time, which may be stored either before or +after the image data, you should pass the separate png_info struct if +you want to keep the comments from before and after the image +separate. If you are not interested, you can pass NULL. + + png_read_end(png_ptr, end_info); + +When you are done, you can free all memory allocated by libpng like this: + + png_destroy_read_struct(&png_ptr, &info_ptr, + &end_info); + +It is also possible to individually free the info_ptr members that +point to libpng-allocated storage with the following function: + + png_free_data(png_ptr, info_ptr, mask, seq) + + mask - identifies data to be freed, a mask + containing the bitwise OR of one or + more of + PNG_FREE_PLTE, PNG_FREE_TRNS, + PNG_FREE_HIST, PNG_FREE_ICCP, + PNG_FREE_PCAL, PNG_FREE_ROWS, + PNG_FREE_SCAL, PNG_FREE_SPLT, + PNG_FREE_TEXT, PNG_FREE_UNKN, + or simply PNG_FREE_ALL + + seq - sequence number of item to be freed + (-1 for all items) + +This function may be safely called when the relevant storage has +already been freed, or has not yet been allocated, or was allocated +by the user and not by libpng, and will in those cases do nothing. +The "seq" parameter is ignored if only one item of the selected data +type, such as PLTE, is allowed. If "seq" is not -1, and multiple items +are allowed for the data type identified in the mask, such as text or +sPLT, only the n'th item in the structure is freed, where n is "seq". + +The default behavior is only to free data that was allocated internally +by libpng. This can be changed, so that libpng will not free the data, +or so that it will free data that was allocated by the user with png_malloc() +or png_zalloc() and passed in via a png_set_*() function, with + + png_data_freer(png_ptr, info_ptr, freer, mask) + + freer - one of + PNG_DESTROY_WILL_FREE_DATA + PNG_SET_WILL_FREE_DATA + PNG_USER_WILL_FREE_DATA + + mask - which data elements are affected + same choices as in png_free_data() + +This function only affects data that has already been allocated. +You can call this function after reading the PNG data but before calling +any png_set_*() functions, to control whether the user or the png_set_*() +function is responsible for freeing any existing data that might be present, +and again after the png_set_*() functions to control whether the user +or png_destroy_*() is supposed to free the data. When the user assumes +responsibility for libpng-allocated data, the application must use +png_free() to free it, and when the user transfers responsibility to libpng +for data that the user has allocated, the user must have used png_malloc() +or png_zalloc() to allocate it. + +If you allocated your row_pointers in a single block, as suggested above in +the description of the high level read interface, you must not transfer +responsibility for freeing it to the png_set_rows or png_read_destroy function, +because they would also try to free the individual row_pointers[i]. + +If you allocated text_ptr.text, text_ptr.lang, and text_ptr.translated_keyword +separately, do not transfer responsibility for freeing text_ptr to libpng, +because when libpng fills a png_text structure it combines these members with +the key member, and png_free_data() will free only text_ptr.key. Similarly, +if you transfer responsibility for free'ing text_ptr from libpng to your +application, your application must not separately free those members. + +The png_free_data() function will turn off the "valid" flag for anything +it frees. If you need to turn the flag off for a chunk that was freed by +your application instead of by libpng, you can use + + png_set_invalid(png_ptr, info_ptr, mask); + + mask - identifies the chunks to be made invalid, + containing the bitwise OR of one or + more of + PNG_INFO_gAMA, PNG_INFO_sBIT, + PNG_INFO_cHRM, PNG_INFO_PLTE, + PNG_INFO_tRNS, PNG_INFO_bKGD, + PNG_INFO_hIST, PNG_INFO_pHYs, + PNG_INFO_oFFs, PNG_INFO_tIME, + PNG_INFO_pCAL, PNG_INFO_sRGB, + PNG_INFO_iCCP, PNG_INFO_sPLT, + PNG_INFO_sCAL, PNG_INFO_IDAT + +For a more compact example of reading a PNG image, see the file example.c. + +Reading PNG files progressively + +The progressive reader is slightly different then the non-progressive +reader. Instead of calling png_read_info(), png_read_rows(), and +png_read_end(), you make one call to png_process_data(), which calls +callbacks when it has the info, a row, or the end of the image. You +set up these callbacks with png_set_progressive_read_fn(). You don't +have to worry about the input/output functions of libpng, as you are +giving the library the data directly in png_process_data(). I will +assume that you have read the section on reading PNG files above, +so I will only highlight the differences (although I will show +all of the code). + +png_structp png_ptr; +png_infop info_ptr; + + /* An example code fragment of how you would + initialize the progressive reader in your + application. */ + int + initialize_png_reader() + { + png_ptr = png_create_read_struct + (PNG_LIBPNG_VER_STRING, (png_voidp)user_error_ptr, + user_error_fn, user_warning_fn); + + if (!png_ptr) + return (ERROR); + + info_ptr = png_create_info_struct(png_ptr); + + if (!info_ptr) + { + png_destroy_read_struct(&png_ptr, + (png_infopp)NULL, (png_infopp)NULL); + return (ERROR); + } + + if (setjmp(png_jmpbuf(png_ptr))) + { + png_destroy_read_struct(&png_ptr, &info_ptr, + (png_infopp)NULL); + return (ERROR); + } + + /* This one's new. You can provide functions + to be called when the header info is valid, + when each row is completed, and when the image + is finished. If you aren't using all functions, + you can specify NULL parameters. Even when all + three functions are NULL, you need to call + png_set_progressive_read_fn(). You can use + any struct as the user_ptr (cast to a void pointer + for the function call), and retrieve the pointer + from inside the callbacks using the function + + png_get_progressive_ptr(png_ptr); + + which will return a void pointer, which you have + to cast appropriately. + */ + png_set_progressive_read_fn(png_ptr, (void *)user_ptr, + info_callback, row_callback, end_callback); + + return 0; + } + + /* A code fragment that you call as you receive blocks + of data */ + int + process_data(png_bytep buffer, png_uint_32 length) + { + if (setjmp(png_jmpbuf(png_ptr))) + { + png_destroy_read_struct(&png_ptr, &info_ptr, + (png_infopp)NULL); + return (ERROR); + } + + /* This one's new also. Simply give it a chunk + of data from the file stream (in order, of + course). On machines with segmented memory + models machines, don't give it any more than + 64K. The library seems to run fine with sizes + of 4K. Although you can give it much less if + necessary (I assume you can give it chunks of + 1 byte, I haven't tried less then 256 bytes + yet). When this function returns, you may + want to display any rows that were generated + in the row callback if you don't already do + so there. + */ + png_process_data(png_ptr, info_ptr, buffer, length); + + /* At this point you can call png_process_data_skip if + you want to handle data the library will skip yourself; + it simply returns the number of bytes to skip (and stops + libpng skipping that number of bytes on the next + png_process_data call). + return 0; + } + + /* This function is called (as set by + png_set_progressive_read_fn() above) when enough data + has been supplied so all of the header has been + read. + */ + void + info_callback(png_structp png_ptr, png_infop info) + { + /* Do any setup here, including setting any of + the transformations mentioned in the Reading + PNG files section. For now, you _must_ call + either png_start_read_image() or + png_read_update_info() after all the + transformations are set (even if you don't set + any). You may start getting rows before + png_process_data() returns, so this is your + last chance to prepare for that. + + This is where you turn on interlace handling, + assuming you don't want to do it yourself. + + If you need to you can stop the processing of + your original input data at this point by calling + png_process_data_pause. This returns the number + of unprocessed bytes from the last png_process_data + call - it is up to you to ensure that the next call + sees these bytes again. If you don't want to bother + with this you can get libpng to cache the unread + bytes by setting the 'save' parameter (see png.h) but + then libpng will have to copy the data internally. + */ + } + + /* This function is called when each row of image + data is complete */ + void + row_callback(png_structp png_ptr, png_bytep new_row, + png_uint_32 row_num, int pass) + { + /* If the image is interlaced, and you turned + on the interlace handler, this function will + be called for every row in every pass. Some + of these rows will not be changed from the + previous pass. When the row is not changed, + the new_row variable will be NULL. The rows + and passes are called in order, so you don't + really need the row_num and pass, but I'm + supplying them because it may make your life + easier. + + If you did not turn on interlace handling then + the callback is called for each row of each + sub-image when the image is interlaced. In this + case 'row_num' is the row in the sub-image, not + the row in the output image as it is in all other + cases. + + For the non-NULL rows of interlaced images when + you have switched on libpng interlace handling, + you must call png_progressive_combine_row() + passing in the row and the old row. You can + call this function for NULL rows (it will just + return) and for non-interlaced images (it just + does the memcpy for you) if it will make the + code easier. Thus, you can just do this for + all cases if you switch on interlace handling; + */ + + png_progressive_combine_row(png_ptr, old_row, + new_row); + + /* where old_row is what was displayed for + previously for the row. Note that the first + pass (pass == 0, really) will completely cover + the old row, so the rows do not have to be + initialized. After the first pass (and only + for interlaced images), you will have to pass + the current row, and the function will combine + the old row and the new row. + + You can also call png_process_data_pause in this + callback - see above. + */ + } + + void + end_callback(png_structp png_ptr, png_infop info) + { + /* This function is called after the whole image + has been read, including any chunks after the + image (up to and including the IEND). You + will usually have the same info chunk as you + had in the header, although some data may have + been added to the comments and time fields. + + Most people won't do much here, perhaps setting + a flag that marks the image as finished. + */ + } + + + +IV. Writing + +Much of this is very similar to reading. However, everything of +importance is repeated here, so you won't have to constantly look +back up in the reading section to understand writing. + +Setup + +You will want to do the I/O initialization before you get into libpng, +so if it doesn't work, you don't have anything to undo. If you are not +using the standard I/O functions, you will need to replace them with +custom writing functions. See the discussion under Customizing libpng. + + FILE *fp = fopen(file_name, "wb"); + + if (!fp) + return (ERROR); + +Next, png_struct and png_info need to be allocated and initialized. +As these can be both relatively large, you may not want to store these +on the stack, unless you have stack space to spare. Of course, you +will want to check if they return NULL. If you are also reading, +you won't want to name your read structure and your write structure +both "png_ptr"; you can call them anything you like, such as +"read_ptr" and "write_ptr". Look at pngtest.c, for example. + + png_structp png_ptr = png_create_write_struct + (PNG_LIBPNG_VER_STRING, (png_voidp)user_error_ptr, + user_error_fn, user_warning_fn); + + if (!png_ptr) + return (ERROR); + + png_infop info_ptr = png_create_info_struct(png_ptr); + if (!info_ptr) + { + png_destroy_write_struct(&png_ptr, + (png_infopp)NULL); + return (ERROR); + } + +If you want to use your own memory allocation routines, +define PNG_USER_MEM_SUPPORTED and use +png_create_write_struct_2() instead of png_create_write_struct(): + + png_structp png_ptr = png_create_write_struct_2 + (PNG_LIBPNG_VER_STRING, (png_voidp)user_error_ptr, + user_error_fn, user_warning_fn, (png_voidp) + user_mem_ptr, user_malloc_fn, user_free_fn); + +After you have these structures, you will need to set up the +error handling. When libpng encounters an error, it expects to +longjmp() back to your routine. Therefore, you will need to call +setjmp() and pass the png_jmpbuf(png_ptr). If you +write the file from different routines, you will need to update +the png_jmpbuf(png_ptr) every time you enter a new routine that will +call a png_*() function. See your documentation of setjmp/longjmp +for your compiler for more information on setjmp/longjmp. See +the discussion on libpng error handling in the Customizing Libpng +section below for more information on the libpng error handling. + + if (setjmp(png_jmpbuf(png_ptr))) + { + png_destroy_write_struct(&png_ptr, &info_ptr); + fclose(fp); + return (ERROR); + } + ... + return; + +If you would rather avoid the complexity of setjmp/longjmp issues, +you can compile libpng with PNG_NO_SETJMP, in which case +errors will result in a call to PNG_ABORT() which defaults to abort(). + +You can #define PNG_ABORT() to a function that does something +more useful than abort(), as long as your function does not +return. + +Now you need to set up the output code. The default for libpng is to +use the C function fwrite(). If you use this, you will need to pass a +valid FILE * in the function png_init_io(). Be sure that the file is +opened in binary mode. Again, if you wish to handle writing data in +another way, see the discussion on libpng I/O handling in the Customizing +Libpng section below. + + png_init_io(png_ptr, fp); + +If you are embedding your PNG into a datastream such as MNG, and don't +want libpng to write the 8-byte signature, or if you have already +written the signature in your application, use + + png_set_sig_bytes(png_ptr, 8); + +to inform libpng that it should not write a signature. + +Write callbacks + +At this point, you can set up a callback function that will be +called after each row has been written, which you can use to control +a progress meter or the like. It's demonstrated in pngtest.c. +You must supply a function + + void write_row_callback(png_structp png_ptr, png_uint_32 row, + int pass); + { + /* put your code here */ + } + +(You can give it another name that you like instead of "write_row_callback") + +To inform libpng about your function, use + + png_set_write_status_fn(png_ptr, write_row_callback); + +You now have the option of modifying how the compression library will +run. The following functions are mainly for testing, but may be useful +in some cases, like if you need to write PNG files extremely fast and +are willing to give up some compression, or if you want to get the +maximum possible compression at the expense of slower writing. If you +have no special needs in this area, let the library do what it wants by +not calling this function at all, as it has been tuned to deliver a good +speed/compression ratio. The second parameter to png_set_filter() is +the filter method, for which the only valid values are 0 (as of the +July 1999 PNG specification, version 1.2) or 64 (if you are writing +a PNG datastream that is to be embedded in a MNG datastream). The third +parameter is a flag that indicates which filter type(s) are to be tested +for each scanline. See the PNG specification for details on the specific +filter types. + + + /* turn on or off filtering, and/or choose + specific filters. You can use either a single + PNG_FILTER_VALUE_NAME or the bitwise OR of one + or more PNG_FILTER_NAME masks. + */ + png_set_filter(png_ptr, 0, + PNG_FILTER_NONE | PNG_FILTER_VALUE_NONE | + PNG_FILTER_SUB | PNG_FILTER_VALUE_SUB | + PNG_FILTER_UP | PNG_FILTER_VALUE_UP | + PNG_FILTER_AVG | PNG_FILTER_VALUE_AVG | + PNG_FILTER_PAETH | PNG_FILTER_VALUE_PAETH| + PNG_ALL_FILTERS); + +If an application wants to start and stop using particular filters during +compression, it should start out with all of the filters (to ensure that +the previous row of pixels will be stored in case it's needed later), +and then add and remove them after the start of compression. + +If you are writing a PNG datastream that is to be embedded in a MNG +datastream, the second parameter can be either 0 or 64. + +The png_set_compression_*() functions interface to the zlib compression +library, and should mostly be ignored unless you really know what you are +doing. The only generally useful call is png_set_compression_level() +which changes how much time zlib spends on trying to compress the image +data. See the Compression Library (zlib.h and algorithm.txt, distributed +with zlib) for details on the compression levels. + + /* set the zlib compression level */ + png_set_compression_level(png_ptr, + Z_BEST_COMPRESSION); + + /* set other zlib parameters */ + png_set_compression_mem_level(png_ptr, 8); + png_set_compression_strategy(png_ptr, + Z_DEFAULT_STRATEGY); + png_set_compression_window_bits(png_ptr, 15); + png_set_compression_method(png_ptr, 8); + png_set_compression_buffer_size(png_ptr, 8192) + +extern PNG_EXPORT(void,png_set_zbuf_size) + +Setting the contents of info for output + +You now need to fill in the png_info structure with all the data you +wish to write before the actual image. Note that the only thing you +are allowed to write after the image is the text chunks and the time +chunk (as of PNG Specification 1.2, anyway). See png_write_end() and +the latest PNG specification for more information on that. If you +wish to write them before the image, fill them in now, and flag that +data as being valid. If you want to wait until after the data, don't +fill them until png_write_end(). For all the fields in png_info and +their data types, see png.h. For explanations of what the fields +contain, see the PNG specification. + +Some of the more important parts of the png_info are: + + png_set_IHDR(png_ptr, info_ptr, width, height, + bit_depth, color_type, interlace_type, + compression_type, filter_method) + + width - holds the width of the image + in pixels (up to 2^31). + + height - holds the height of the image + in pixels (up to 2^31). + + bit_depth - holds the bit depth of one of the + image channels. + (valid values are 1, 2, 4, 8, 16 + and depend also on the + color_type. See also significant + bits (sBIT) below). + + color_type - describes which color/alpha + channels are present. + PNG_COLOR_TYPE_GRAY + (bit depths 1, 2, 4, 8, 16) + PNG_COLOR_TYPE_GRAY_ALPHA + (bit depths 8, 16) + PNG_COLOR_TYPE_PALETTE + (bit depths 1, 2, 4, 8) + PNG_COLOR_TYPE_RGB + (bit_depths 8, 16) + PNG_COLOR_TYPE_RGB_ALPHA + (bit_depths 8, 16) + + PNG_COLOR_MASK_PALETTE + PNG_COLOR_MASK_COLOR + PNG_COLOR_MASK_ALPHA + + interlace_type - PNG_INTERLACE_NONE or + PNG_INTERLACE_ADAM7 + + compression_type - (must be + PNG_COMPRESSION_TYPE_DEFAULT) + + filter_method - (must be PNG_FILTER_TYPE_DEFAULT + or, if you are writing a PNG to + be embedded in a MNG datastream, + can also be + PNG_INTRAPIXEL_DIFFERENCING) + +If you call png_set_IHDR(), the call must appear before any of the +other png_set_*() functions, because they might require access to some of +the IHDR settings. The remaining png_set_*() functions can be called +in any order. + +If you wish, you can reset the compression_type, interlace_type, or +filter_method later by calling png_set_IHDR() again; if you do this, the +width, height, bit_depth, and color_type must be the same in each call. + + png_set_PLTE(png_ptr, info_ptr, palette, + num_palette); + + palette - the palette for the file + (array of png_color) + num_palette - number of entries in the palette + + png_set_gAMA(png_ptr, info_ptr, file_gamma); + png_set_gAMA_fixed(png_ptr, info_ptr, int_file_gamma); + + file_gamma - the gamma at which the image was + created (PNG_INFO_gAMA) + + int_file_gamma - 100,000 times the gamma at which + the image was created + + png_set_sRGB(png_ptr, info_ptr, srgb_intent); + + srgb_intent - the rendering intent + (PNG_INFO_sRGB) The presence of + the sRGB chunk means that the pixel + data is in the sRGB color space. + This chunk also implies specific + values of gAMA and cHRM. Rendering + intent is the CSS-1 property that + has been defined by the International + Color Consortium + (http://www.color.org). + It can be one of + PNG_sRGB_INTENT_SATURATION, + PNG_sRGB_INTENT_PERCEPTUAL, + PNG_sRGB_INTENT_ABSOLUTE, or + PNG_sRGB_INTENT_RELATIVE. + + + png_set_sRGB_gAMA_and_cHRM(png_ptr, info_ptr, + srgb_intent); + + srgb_intent - the rendering intent + (PNG_INFO_sRGB) The presence of the + sRGB chunk means that the pixel + data is in the sRGB color space. + This function also causes gAMA and + cHRM chunks with the specific values + that are consistent with sRGB to be + written. + + png_set_iCCP(png_ptr, info_ptr, name, compression_type, + profile, proflen); + + name - The profile name. + + compression_type - The compression type; always + PNG_COMPRESSION_TYPE_BASE for PNG 1.0. + You may give NULL to this argument to + ignore it. + + profile - International Color Consortium color + profile data. May contain NULs. + + proflen - length of profile data in bytes. + + png_set_sBIT(png_ptr, info_ptr, sig_bit); + + sig_bit - the number of significant bits for + (PNG_INFO_sBIT) each of the gray, red, + green, and blue channels, whichever are + appropriate for the given color type + (png_color_16) + + png_set_tRNS(png_ptr, info_ptr, trans_alpha, + num_trans, trans_color); + + trans_alpha - array of alpha (transparency) + entries for palette (PNG_INFO_tRNS) + + trans_color - graylevel or color sample values + (in order red, green, blue) of the + single transparent color for + non-paletted images (PNG_INFO_tRNS) + + num_trans - number of transparent entries + (PNG_INFO_tRNS) + + png_set_hIST(png_ptr, info_ptr, hist); + + hist - histogram of palette (array of + png_uint_16) (PNG_INFO_hIST) + + png_set_tIME(png_ptr, info_ptr, mod_time); + + mod_time - time image was last modified + (PNG_VALID_tIME) + + png_set_bKGD(png_ptr, info_ptr, background); + + background - background color (PNG_VALID_bKGD) + + png_set_text(png_ptr, info_ptr, text_ptr, num_text); + + text_ptr - array of png_text holding image + comments + + text_ptr[i].compression - type of compression used + on "text" PNG_TEXT_COMPRESSION_NONE + PNG_TEXT_COMPRESSION_zTXt + PNG_ITXT_COMPRESSION_NONE + PNG_ITXT_COMPRESSION_zTXt + text_ptr[i].key - keyword for comment. Must contain + 1-79 characters. + text_ptr[i].text - text comments for current + keyword. Can be NULL or empty. + text_ptr[i].text_length - length of text string, + after decompression, 0 for iTXt + text_ptr[i].itxt_length - length of itxt string, + after decompression, 0 for tEXt/zTXt + text_ptr[i].lang - language of comment (NULL or + empty for unknown). + text_ptr[i].translated_keyword - keyword in UTF-8 (NULL + or empty for unknown). + Note that the itxt_length, lang, and lang_key + members of the text_ptr structure only exist + when the library is built with iTXt chunk support. + + num_text - number of comments + + png_set_sPLT(png_ptr, info_ptr, &palette_ptr, + num_spalettes); + + palette_ptr - array of png_sPLT_struct structures + to be added to the list of palettes + in the info structure. + num_spalettes - number of palette structures to be + added. + + png_set_oFFs(png_ptr, info_ptr, offset_x, offset_y, + unit_type); + + offset_x - positive offset from the left + edge of the screen + + offset_y - positive offset from the top + edge of the screen + + unit_type - PNG_OFFSET_PIXEL, PNG_OFFSET_MICROMETER + + png_set_pHYs(png_ptr, info_ptr, res_x, res_y, + unit_type); + + res_x - pixels/unit physical resolution + in x direction + + res_y - pixels/unit physical resolution + in y direction + + unit_type - PNG_RESOLUTION_UNKNOWN, + PNG_RESOLUTION_METER + + png_set_sCAL(png_ptr, info_ptr, unit, width, height) + + unit - physical scale units (an integer) + + width - width of a pixel in physical scale units + + height - height of a pixel in physical scale units + (width and height are doubles) + + png_set_sCAL_s(png_ptr, info_ptr, unit, width, height) + + unit - physical scale units (an integer) + + width - width of a pixel in physical scale units + + height - height of a pixel in physical scale units + (width and height are strings like "2.54") + + png_set_unknown_chunks(png_ptr, info_ptr, &unknowns, + num_unknowns) + + unknowns - array of png_unknown_chunk + structures holding unknown chunks + unknowns[i].name - name of unknown chunk + unknowns[i].data - data of unknown chunk + unknowns[i].size - size of unknown chunk's data + unknowns[i].location - position to write chunk in file + 0: do not write chunk + PNG_HAVE_IHDR: before PLTE + PNG_HAVE_PLTE: before IDAT + PNG_AFTER_IDAT: after IDAT + +The "location" member is set automatically according to +what part of the output file has already been written. +You can change its value after calling png_set_unknown_chunks() +as demonstrated in pngtest.c. Within each of the "locations", +the chunks are sequenced according to their position in the +structure (that is, the value of "i", which is the order in which +the chunk was either read from the input file or defined with +png_set_unknown_chunks). + +A quick word about text and num_text. text is an array of png_text +structures. num_text is the number of valid structures in the array. +Each png_text structure holds a language code, a keyword, a text value, +and a compression type. + +The compression types have the same valid numbers as the compression +types of the image data. Currently, the only valid number is zero. +However, you can store text either compressed or uncompressed, unlike +images, which always have to be compressed. So if you don't want the +text compressed, set the compression type to PNG_TEXT_COMPRESSION_NONE. +Because tEXt and zTXt chunks don't have a language field, if you +specify PNG_TEXT_COMPRESSION_NONE or PNG_TEXT_COMPRESSION_zTXt +any language code or translated keyword will not be written out. + +Until text gets around 1000 bytes, it is not worth compressing it. +After the text has been written out to the file, the compression type +is set to PNG_TEXT_COMPRESSION_NONE_WR or PNG_TEXT_COMPRESSION_zTXt_WR, +so that it isn't written out again at the end (in case you are calling +png_write_end() with the same struct). + +The keywords that are given in the PNG Specification are: + + Title Short (one line) title or + caption for image + + Author Name of image's creator + + Description Description of image (possibly long) + + Copyright Copyright notice + + Creation Time Time of original image creation + (usually RFC 1123 format, see below) + + Software Software used to create the image + + Disclaimer Legal disclaimer + + Warning Warning of nature of content + + Source Device used to create the image + + Comment Miscellaneous comment; conversion + from other image format + +The keyword-text pairs work like this. Keywords should be short +simple descriptions of what the comment is about. Some typical +keywords are found in the PNG specification, as is some recommendations +on keywords. You can repeat keywords in a file. You can even write +some text before the image and some after. For example, you may want +to put a description of the image before the image, but leave the +disclaimer until after, so viewers working over modem connections +don't have to wait for the disclaimer to go over the modem before +they start seeing the image. Finally, keywords should be full +words, not abbreviations. Keywords and text are in the ISO 8859-1 +(Latin-1) character set (a superset of regular ASCII) and can not +contain NUL characters, and should not contain control or other +unprintable characters. To make the comments widely readable, stick +with basic ASCII, and avoid machine specific character set extensions +like the IBM-PC character set. The keyword must be present, but +you can leave off the text string on non-compressed pairs. +Compressed pairs must have a text string, as only the text string +is compressed anyway, so the compression would be meaningless. + +PNG supports modification time via the png_time structure. Two +conversion routines are provided, png_convert_from_time_t() for +time_t and png_convert_from_struct_tm() for struct tm. The +time_t routine uses gmtime(). You don't have to use either of +these, but if you wish to fill in the png_time structure directly, +you should provide the time in universal time (GMT) if possible +instead of your local time. Note that the year number is the full +year (e.g. 1998, rather than 98 - PNG is year 2000 compliant!), and +that months start with 1. + +If you want to store the time of the original image creation, you should +use a plain tEXt chunk with the "Creation Time" keyword. This is +necessary because the "creation time" of a PNG image is somewhat vague, +depending on whether you mean the PNG file, the time the image was +created in a non-PNG format, a still photo from which the image was +scanned, or possibly the subject matter itself. In order to facilitate +machine-readable dates, it is recommended that the "Creation Time" +tEXt chunk use RFC 1123 format dates (e.g. "22 May 1997 18:07:10 GMT"), +although this isn't a requirement. Unlike the tIME chunk, the +"Creation Time" tEXt chunk is not expected to be automatically changed +by the software. To facilitate the use of RFC 1123 dates, a function +png_convert_to_rfc1123(png_timep) is provided to convert from PNG +time to an RFC 1123 format string. + +Writing unknown chunks + +You can use the png_set_unknown_chunks function to queue up chunks +for writing. You give it a chunk name, raw data, and a size; that's +all there is to it. The chunks will be written by the next following +png_write_info_before_PLTE, png_write_info, or png_write_end function. +Any chunks previously read into the info structure's unknown-chunk +list will also be written out in a sequence that satisfies the PNG +specification's ordering rules. + +The high-level write interface + +At this point there are two ways to proceed; through the high-level +write interface, or through a sequence of low-level write operations. +You can use the high-level interface if your image data is present +in the info structure. All defined output +transformations are permitted, enabled by the following masks. + + PNG_TRANSFORM_IDENTITY No transformation + PNG_TRANSFORM_PACKING Pack 1, 2 and 4-bit samples + PNG_TRANSFORM_PACKSWAP Change order of packed + pixels to LSB first + PNG_TRANSFORM_INVERT_MONO Invert monochrome images + PNG_TRANSFORM_SHIFT Normalize pixels to the + sBIT depth + PNG_TRANSFORM_BGR Flip RGB to BGR, RGBA + to BGRA + PNG_TRANSFORM_SWAP_ALPHA Flip RGBA to ARGB or GA + to AG + PNG_TRANSFORM_INVERT_ALPHA Change alpha from opacity + to transparency + PNG_TRANSFORM_SWAP_ENDIAN Byte-swap 16-bit samples + PNG_TRANSFORM_STRIP_FILLER Strip out filler + bytes (deprecated). + PNG_TRANSFORM_STRIP_FILLER_BEFORE Strip out leading + filler bytes + PNG_TRANSFORM_STRIP_FILLER_AFTER Strip out trailing + filler bytes + +If you have valid image data in the info structure (you can use +png_set_rows() to put image data in the info structure), simply do this: + + png_write_png(png_ptr, info_ptr, png_transforms, NULL) + +where png_transforms is an integer containing the bitwise OR of some set of +transformation flags. This call is equivalent to png_write_info(), +followed the set of transformations indicated by the transform mask, +then png_write_image(), and finally png_write_end(). + +(The final parameter of this call is not yet used. Someday it might point +to transformation parameters required by some future output transform.) + +You must use png_transforms and not call any png_set_transform() functions +when you use png_write_png(). + +The low-level write interface + +If you are going the low-level route instead, you are now ready to +write all the file information up to the actual image data. You do +this with a call to png_write_info(). + + png_write_info(png_ptr, info_ptr); + +Note that there is one transformation you may need to do before +png_write_info(). In PNG files, the alpha channel in an image is the +level of opacity. If your data is supplied as a level of transparency, +you can invert the alpha channel before you write it, so that 0 is +fully transparent and 255 (in 8-bit or paletted images) or 65535 +(in 16-bit images) is fully opaque, with + + png_set_invert_alpha(png_ptr); + +This must appear before png_write_info() instead of later with the +other transformations because in the case of paletted images the tRNS +chunk data has to be inverted before the tRNS chunk is written. If +your image is not a paletted image, the tRNS data (which in such cases +represents a single color to be rendered as transparent) won't need to +be changed, and you can safely do this transformation after your +png_write_info() call. + +If you need to write a private chunk that you want to appear before +the PLTE chunk when PLTE is present, you can write the PNG info in +two steps, and insert code to write your own chunk between them: + + png_write_info_before_PLTE(png_ptr, info_ptr); + png_set_unknown_chunks(png_ptr, info_ptr, ...); + png_write_info(png_ptr, info_ptr); + +After you've written the file information, you can set up the library +to handle any special transformations of the image data. The various +ways to transform the data will be described in the order that they +should occur. This is important, as some of these change the color +type and/or bit depth of the data, and some others only work on +certain color types and bit depths. Even though each transformation +checks to see if it has data that it can do something with, you should +make sure to only enable a transformation if it will be valid for the +data. For example, don't swap red and blue on grayscale data. + +PNG files store RGB pixels packed into 3 or 6 bytes. This code tells +the library to strip input data that has 4 or 8 bytes per pixel down +to 3 or 6 bytes (or strip 2 or 4-byte grayscale+filler data to 1 or 2 +bytes per pixel). + + png_set_filler(png_ptr, 0, PNG_FILLER_BEFORE); + +where the 0 is unused, and the location is either PNG_FILLER_BEFORE or +PNG_FILLER_AFTER, depending upon whether the filler byte in the pixel +is stored XRGB or RGBX. + +PNG files pack pixels of bit depths 1, 2, and 4 into bytes as small as +they can, resulting in, for example, 8 pixels per byte for 1 bit files. +If the data is supplied at 1 pixel per byte, use this code, which will +correctly pack the pixels into a single byte: + + png_set_packing(png_ptr); + +PNG files reduce possible bit depths to 1, 2, 4, 8, and 16. If your +data is of another bit depth, you can write an sBIT chunk into the +file so that decoders can recover the original data if desired. + + /* Set the true bit depth of the image data */ + if (color_type & PNG_COLOR_MASK_COLOR) + { + sig_bit.red = true_bit_depth; + sig_bit.green = true_bit_depth; + sig_bit.blue = true_bit_depth; + } + + else + { + sig_bit.gray = true_bit_depth; + } + + if (color_type & PNG_COLOR_MASK_ALPHA) + { + sig_bit.alpha = true_bit_depth; + } + + png_set_sBIT(png_ptr, info_ptr, &sig_bit); + +If the data is stored in the row buffer in a bit depth other than +one supported by PNG (e.g. 3 bit data in the range 0-7 for a 4-bit PNG), +this will scale the values to appear to be the correct bit depth as +is required by PNG. + + png_set_shift(png_ptr, &sig_bit); + +PNG files store 16 bit pixels in network byte order (big-endian, +ie. most significant bits first). This code would be used if they are +supplied the other way (little-endian, i.e. least significant bits +first, the way PCs store them): + + if (bit_depth > 8) + png_set_swap(png_ptr); + +If you are using packed-pixel images (1, 2, or 4 bits/pixel), and you +need to change the order the pixels are packed into bytes, you can use: + + if (bit_depth < 8) + png_set_packswap(png_ptr); + +PNG files store 3 color pixels in red, green, blue order. This code +would be used if they are supplied as blue, green, red: + + png_set_bgr(png_ptr); + +PNG files describe monochrome as black being zero and white being +one. This code would be used if the pixels are supplied with this reversed +(black being one and white being zero): + + png_set_invert_mono(png_ptr); + +Finally, you can write your own transformation function if none of +the existing ones meets your needs. This is done by setting a callback +with + + png_set_write_user_transform_fn(png_ptr, + write_transform_fn); + +You must supply the function + + void write_transform_fn(png_structp png_ptr ptr, + row_info_ptr row_info, png_bytep data) + +See pngtest.c for a working example. Your function will be called +before any of the other transformations are processed. If supported +libpng also supplies an information routine that may be called from +your callback: + + png_get_current_row_number(png_ptr); + +This returns the current row passed to the transform. Even with interlaced +images the value returned is the row in the final output image. + +You can also set up a pointer to a user structure for use by your +callback function. + + png_set_user_transform_info(png_ptr, user_ptr, 0, 0); + +The user_channels and user_depth parameters of this function are ignored +when writing; you can set them to zero as shown. + +You can retrieve the pointer via the function png_get_user_transform_ptr(). +For example: + + voidp write_user_transform_ptr = + png_get_user_transform_ptr(png_ptr); + +It is possible to have libpng flush any pending output, either manually, +or automatically after a certain number of lines have been written. To +flush the output stream a single time call: + + png_write_flush(png_ptr); + +and to have libpng flush the output stream periodically after a certain +number of scanlines have been written, call: + + png_set_flush(png_ptr, nrows); + +Note that the distance between rows is from the last time png_write_flush() +was called, or the first row of the image if it has never been called. +So if you write 50 lines, and then png_set_flush 25, it will flush the +output on the next scanline, and every 25 lines thereafter, unless +png_write_flush() is called before 25 more lines have been written. +If nrows is too small (less than about 10 lines for a 640 pixel wide +RGB image) the image compression may decrease noticeably (although this +may be acceptable for real-time applications). Infrequent flushing will +only degrade the compression performance by a few percent over images +that do not use flushing. + +Writing the image data + +That's it for the transformations. Now you can write the image data. +The simplest way to do this is in one function call. If you have the +whole image in memory, you can just call png_write_image() and libpng +will write the image. You will need to pass in an array of pointers to +each row. This function automatically handles interlacing, so you don't +need to call png_set_interlace_handling() or call this function multiple +times, or any of that other stuff necessary with png_write_rows(). + + png_write_image(png_ptr, row_pointers); + +where row_pointers is: + + png_byte *row_pointers[height]; + +You can point to void or char or whatever you use for pixels. + +If you don't want to write the whole image at once, you can +use png_write_rows() instead. If the file is not interlaced, +this is simple: + + png_write_rows(png_ptr, row_pointers, + number_of_rows); + +row_pointers is the same as in the png_write_image() call. + +If you are just writing one row at a time, you can do this with +a single row_pointer instead of an array of row_pointers: + + png_bytep row_pointer = row; + + png_write_row(png_ptr, row_pointer); + +When the file is interlaced, things can get a good deal more complicated. +The only currently (as of the PNG Specification version 1.2, dated July +1999) defined interlacing scheme for PNG files is the "Adam7" interlace +scheme, that breaks down an image into seven smaller images of varying +size. libpng will build these images for you, or you can do them +yourself. If you want to build them yourself, see the PNG specification +for details of which pixels to write when. + +If you don't want libpng to handle the interlacing details, just +use png_set_interlace_handling() and call png_write_rows() the +correct number of times to write all the sub-images +(png_set_interlace_handling() returns the number of sub-images.) + +If you want libpng to build the sub-images, call this before you start +writing any rows: + + number_of_passes = png_set_interlace_handling(png_ptr); + +This will return the number of passes needed. Currently, this is seven, +but may change if another interlace type is added. + +Then write the complete image number_of_passes times. + + png_write_rows(png_ptr, row_pointers, number_of_rows); + +Think carefully before you write an interlaced image. Typically code that +reads such images reads all the image data into memory, uncompressed, before +doing any processing. Only code that can display an image on the fly can +take advantage of the interlacing and even then the image has to be exactly +the correct size for the output device, because scaling an image requires +adjacent pixels and these are not available until all the passes have been +read. + +If you do write an interlaced image you will hardly ever need to handle +the interlacing yourself. Call png_set_interlace_handling() and use the +approach described above. + +The only time it is conceivable that you will really need to write an +interlaced image pass-by-pass is when you have read one pass by pass and +made some pixel-by-pixel transformation to it, as described in the read +code above. In this case use the PNG_PASS_ROWS and PNG_PASS_COLS macros +to determine the size of each sub-image in turn and simply write the rows +you obtained from the read code. + +Finishing a sequential write + +After you are finished writing the image, you should finish writing +the file. If you are interested in writing comments or time, you should +pass an appropriately filled png_info pointer. If you are not interested, +you can pass NULL. + + png_write_end(png_ptr, info_ptr); + +When you are done, you can free all memory used by libpng like this: + + png_destroy_write_struct(&png_ptr, &info_ptr); + +It is also possible to individually free the info_ptr members that +point to libpng-allocated storage with the following function: + + png_free_data(png_ptr, info_ptr, mask, seq) + + mask - identifies data to be freed, a mask + containing the bitwise OR of one or + more of + PNG_FREE_PLTE, PNG_FREE_TRNS, + PNG_FREE_HIST, PNG_FREE_ICCP, + PNG_FREE_PCAL, PNG_FREE_ROWS, + PNG_FREE_SCAL, PNG_FREE_SPLT, + PNG_FREE_TEXT, PNG_FREE_UNKN, + or simply PNG_FREE_ALL + + seq - sequence number of item to be freed + (-1 for all items) + +This function may be safely called when the relevant storage has +already been freed, or has not yet been allocated, or was allocated +by the user and not by libpng, and will in those cases do nothing. +The "seq" parameter is ignored if only one item of the selected data +type, such as PLTE, is allowed. If "seq" is not -1, and multiple items +are allowed for the data type identified in the mask, such as text or +sPLT, only the n'th item in the structure is freed, where n is "seq". + +If you allocated data such as a palette that you passed in to libpng +with png_set_*, you must not free it until just before the call to +png_destroy_write_struct(). + +The default behavior is only to free data that was allocated internally +by libpng. This can be changed, so that libpng will not free the data, +or so that it will free data that was allocated by the user with png_malloc() +or png_zalloc() and passed in via a png_set_*() function, with + + png_data_freer(png_ptr, info_ptr, freer, mask) + + freer - one of + PNG_DESTROY_WILL_FREE_DATA + PNG_SET_WILL_FREE_DATA + PNG_USER_WILL_FREE_DATA + + mask - which data elements are affected + same choices as in png_free_data() + +For example, to transfer responsibility for some data from a read structure +to a write structure, you could use + + png_data_freer(read_ptr, read_info_ptr, + PNG_USER_WILL_FREE_DATA, + PNG_FREE_PLTE|PNG_FREE_tRNS|PNG_FREE_hIST) + + png_data_freer(write_ptr, write_info_ptr, + PNG_DESTROY_WILL_FREE_DATA, + PNG_FREE_PLTE|PNG_FREE_tRNS|PNG_FREE_hIST) + +thereby briefly reassigning responsibility for freeing to the user but +immediately afterwards reassigning it once more to the write_destroy +function. Having done this, it would then be safe to destroy the read +structure and continue to use the PLTE, tRNS, and hIST data in the write +structure. + +This function only affects data that has already been allocated. +You can call this function before calling after the png_set_*() functions +to control whether the user or png_destroy_*() is supposed to free the data. +When the user assumes responsibility for libpng-allocated data, the +application must use +png_free() to free it, and when the user transfers responsibility to libpng +for data that the user has allocated, the user must have used png_malloc() +or png_zalloc() to allocate it. + +If you allocated text_ptr.text, text_ptr.lang, and text_ptr.translated_keyword +separately, do not transfer responsibility for freeing text_ptr to libpng, +because when libpng fills a png_text structure it combines these members with +the key member, and png_free_data() will free only text_ptr.key. Similarly, +if you transfer responsibility for free'ing text_ptr from libpng to your +application, your application must not separately free those members. +For a more compact example of writing a PNG image, see the file example.c. + +V. Modifying/Customizing libpng: + +There are two issues here. The first is changing how libpng does +standard things like memory allocation, input/output, and error handling. +The second deals with more complicated things like adding new chunks, +adding new transformations, and generally changing how libpng works. +Both of those are compile-time issues; that is, they are generally +determined at the time the code is written, and there is rarely a need +to provide the user with a means of changing them. + +Memory allocation, input/output, and error handling + +All of the memory allocation, input/output, and error handling in libpng +goes through callbacks that are user-settable. The default routines are +in pngmem.c, pngrio.c, pngwio.c, and pngerror.c, respectively. To change +these functions, call the appropriate png_set_*_fn() function. + +Memory allocation is done through the functions png_malloc(), png_calloc(), +and png_free(). These currently just call the standard C functions. +png_calloc() calls png_malloc() and then clears the newly +allocated memory to zero. There is limited support for certain systems +with segmented memory architectures and the types of pointers declared by +png.h match this; you will have to use appropriate pointers in your +application. Since it is +unlikely that the method of handling memory allocation on a platform +will change between applications, these functions must be modified in +the library at compile time. If you prefer to use a different method +of allocating and freeing data, you can use png_create_read_struct_2() or +png_create_write_struct_2() to register your own functions as described +above. These functions also provide a void pointer that can be retrieved +via + + mem_ptr=png_get_mem_ptr(png_ptr); + +Your replacement memory functions must have prototypes as follows: + + png_voidp malloc_fn(png_structp png_ptr, + png_alloc_size_t size); + + void free_fn(png_structp png_ptr, png_voidp ptr); + +Your malloc_fn() must return NULL in case of failure. The png_malloc() +function will normally call png_error() if it receives a NULL from the +system memory allocator or from your replacement malloc_fn(). + +Your free_fn() will never be called with a NULL ptr, since libpng's +png_free() checks for NULL before calling free_fn(). + +Input/Output in libpng is done through png_read() and png_write(), +which currently just call fread() and fwrite(). The FILE * is stored in +png_struct and is initialized via png_init_io(). If you wish to change +the method of I/O, the library supplies callbacks that you can set +through the function png_set_read_fn() and png_set_write_fn() at run +time, instead of calling the png_init_io() function. These functions +also provide a void pointer that can be retrieved via the function +png_get_io_ptr(). For example: + + png_set_read_fn(png_structp read_ptr, + voidp read_io_ptr, png_rw_ptr read_data_fn) + + png_set_write_fn(png_structp write_ptr, + voidp write_io_ptr, png_rw_ptr write_data_fn, + png_flush_ptr output_flush_fn); + + voidp read_io_ptr = png_get_io_ptr(read_ptr); + voidp write_io_ptr = png_get_io_ptr(write_ptr); + +The replacement I/O functions must have prototypes as follows: + + void user_read_data(png_structp png_ptr, + png_bytep data, png_size_t length); + + void user_write_data(png_structp png_ptr, + png_bytep data, png_size_t length); + + void user_flush_data(png_structp png_ptr); + +The user_read_data() function is responsible for detecting and +handling end-of-data errors. + +Supplying NULL for the read, write, or flush functions sets them back +to using the default C stream functions, which expect the io_ptr to +point to a standard *FILE structure. It is probably a mistake +to use NULL for one of write_data_fn and output_flush_fn but not both +of them, unless you have built libpng with PNG_NO_WRITE_FLUSH defined. +It is an error to read from a write stream, and vice versa. + +Error handling in libpng is done through png_error() and png_warning(). +Errors handled through png_error() are fatal, meaning that png_error() +should never return to its caller. Currently, this is handled via +setjmp() and longjmp() (unless you have compiled libpng with +PNG_NO_SETJMP, in which case it is handled via PNG_ABORT()), +but you could change this to do things like exit() if you should wish, +as long as your function does not return. + +On non-fatal errors, png_warning() is called +to print a warning message, and then control returns to the calling code. +By default png_error() and png_warning() print a message on stderr via +fprintf() unless the library is compiled with PNG_NO_CONSOLE_IO defined +(because you don't want the messages) or PNG_NO_STDIO defined (because +fprintf() isn't available). If you wish to change the behavior of the error +functions, you will need to set up your own message callbacks. These +functions are normally supplied at the time that the png_struct is created. +It is also possible to redirect errors and warnings to your own replacement +functions after png_create_*_struct() has been called by calling: + + png_set_error_fn(png_structp png_ptr, + png_voidp error_ptr, png_error_ptr error_fn, + png_error_ptr warning_fn); + + png_voidp error_ptr = png_get_error_ptr(png_ptr); + +If NULL is supplied for either error_fn or warning_fn, then the libpng +default function will be used, calling fprintf() and/or longjmp() if a +problem is encountered. The replacement error functions should have +parameters as follows: + + void user_error_fn(png_structp png_ptr, + png_const_charp error_msg); + + void user_warning_fn(png_structp png_ptr, + png_const_charp warning_msg); + +The motivation behind using setjmp() and longjmp() is the C++ throw and +catch exception handling methods. This makes the code much easier to write, +as there is no need to check every return code of every function call. +However, there are some uncertainties about the status of local variables +after a longjmp, so the user may want to be careful about doing anything +after setjmp returns non-zero besides returning itself. Consult your +compiler documentation for more details. For an alternative approach, you +may wish to use the "cexcept" facility (see http://cexcept.sourceforge.net). + +Custom chunks + +If you need to read or write custom chunks, you may need to get deeper +into the libpng code. The library now has mechanisms for storing +and writing chunks of unknown type; you can even declare callbacks +for custom chunks. However, this may not be good enough if the +library code itself needs to know about interactions between your +chunk and existing `intrinsic' chunks. + +If you need to write a new intrinsic chunk, first read the PNG +specification. Acquire a first level of understanding of how it works. +Pay particular attention to the sections that describe chunk names, +and look at how other chunks were designed, so you can do things +similarly. Second, check out the sections of libpng that read and +write chunks. Try to find a chunk that is similar to yours and use +it as a template. More details can be found in the comments inside +the code. It is best to handle unknown chunks in a generic method, +via callback functions, instead of by modifying libpng functions. + +If you wish to write your own transformation for the data, look through +the part of the code that does the transformations, and check out some of +the simpler ones to get an idea of how they work. Try to find a similar +transformation to the one you want to add and copy off of it. More details +can be found in the comments inside the code itself. + +Configuring for 16 bit platforms + +You will want to look into zconf.h to tell zlib (and thus libpng) that +it cannot allocate more then 64K at a time. Even if you can, the memory +won't be accessible. So limit zlib and libpng to 64K by defining MAXSEG_64K. + +Configuring for DOS + +For DOS users who only have access to the lower 640K, you will +have to limit zlib's memory usage via a png_set_compression_mem_level() +call. See zlib.h or zconf.h in the zlib library for more information. + +Configuring for Medium Model + +Libpng's support for medium model has been tested on most of the popular +compilers. Make sure MAXSEG_64K gets defined, USE_FAR_KEYWORD gets +defined, and FAR gets defined to far in pngconf.h, and you should be +all set. Everything in the library (except for zlib's structure) is +expecting far data. You must use the typedefs with the p or pp on +the end for pointers (or at least look at them and be careful). Make +note that the rows of data are defined as png_bytepp, which is an +unsigned char far * far *. + +Configuring for gui/windowing platforms: + +You will need to write new error and warning functions that use the GUI +interface, as described previously, and set them to be the error and +warning functions at the time that png_create_*_struct() is called, +in order to have them available during the structure initialization. +They can be changed later via png_set_error_fn(). On some compilers, +you may also have to change the memory allocators (png_malloc, etc.). + +Configuring for compiler xxx: + +All includes for libpng are in pngconf.h. If you need to add, change +or delete an include, this is the place to do it. +The includes that are not needed outside libpng are placed in pngpriv.h, +which is only used by the routines inside libpng itself. +The files in libpng proper only include pngpriv.h and png.h, which +in turn includes pngconf.h. + +Configuring zlib: + +There are special functions to configure the compression. Perhaps the +most useful one changes the compression level, which currently uses +input compression values in the range 0 - 9. The library normally +uses the default compression level (Z_DEFAULT_COMPRESSION = 6). Tests +have shown that for a large majority of images, compression values in +the range 3-6 compress nearly as well as higher levels, and do so much +faster. For online applications it may be desirable to have maximum speed +(Z_BEST_SPEED = 1). With versions of zlib after v0.99, you can also +specify no compression (Z_NO_COMPRESSION = 0), but this would create +files larger than just storing the raw bitmap. You can specify the +compression level by calling: + + png_set_compression_level(png_ptr, level); + +Another useful one is to reduce the memory level used by the library. +The memory level defaults to 8, but it can be lowered if you are +short on memory (running DOS, for example, where you only have 640K). +Note that the memory level does have an effect on compression; among +other things, lower levels will result in sections of incompressible +data being emitted in smaller stored blocks, with a correspondingly +larger relative overhead of up to 15% in the worst case. + + png_set_compression_mem_level(png_ptr, level); + +The other functions are for configuring zlib. They are not recommended +for normal use and may result in writing an invalid PNG file. See +zlib.h for more information on what these mean. + + png_set_compression_strategy(png_ptr, + strategy); + + png_set_compression_window_bits(png_ptr, + window_bits); + + png_set_compression_method(png_ptr, method); + png_set_compression_buffer_size(png_ptr, size); + +Controlling row filtering + +If you want to control whether libpng uses filtering or not, which +filters are used, and how it goes about picking row filters, you +can call one of these functions. The selection and configuration +of row filters can have a significant impact on the size and +encoding speed and a somewhat lesser impact on the decoding speed +of an image. Filtering is enabled by default for RGB and grayscale +images (with and without alpha), but not for paletted images nor +for any images with bit depths less than 8 bits/pixel. + +The 'method' parameter sets the main filtering method, which is +currently only '0' in the PNG 1.2 specification. The 'filters' +parameter sets which filter(s), if any, should be used for each +scanline. Possible values are PNG_ALL_FILTERS and PNG_NO_FILTERS +to turn filtering on and off, respectively. + +Individual filter types are PNG_FILTER_NONE, PNG_FILTER_SUB, +PNG_FILTER_UP, PNG_FILTER_AVG, PNG_FILTER_PAETH, which can be bitwise +ORed together with '|' to specify one or more filters to use. +These filters are described in more detail in the PNG specification. +If you intend to change the filter type during the course of writing +the image, you should start with flags set for all of the filters +you intend to use so that libpng can initialize its internal +structures appropriately for all of the filter types. (Note that this +means the first row must always be adaptively filtered, because libpng +currently does not allocate the filter buffers until png_write_row() +is called for the first time.) + + filters = PNG_FILTER_NONE | PNG_FILTER_SUB + PNG_FILTER_UP | PNG_FILTER_AVG | + PNG_FILTER_PAETH | PNG_ALL_FILTERS; + + png_set_filter(png_ptr, PNG_FILTER_TYPE_BASE, + filters); + The second parameter can also be + PNG_INTRAPIXEL_DIFFERENCING if you are + writing a PNG to be embedded in a MNG + datastream. This parameter must be the + same as the value of filter_method used + in png_set_IHDR(). + +It is also possible to influence how libpng chooses from among the +available filters. This is done in one or both of two ways - by +telling it how important it is to keep the same filter for successive +rows, and by telling it the relative computational costs of the filters. + + double weights[3] = {1.5, 1.3, 1.1}, + costs[PNG_FILTER_VALUE_LAST] = + {1.0, 1.3, 1.3, 1.5, 1.7}; + + png_set_filter_heuristics(png_ptr, + PNG_FILTER_HEURISTIC_WEIGHTED, 3, + weights, costs); + +The weights are multiplying factors that indicate to libpng that the +row filter should be the same for successive rows unless another row filter +is that many times better than the previous filter. In the above example, +if the previous 3 filters were SUB, SUB, NONE, the SUB filter could have a +"sum of absolute differences" 1.5 x 1.3 times higher than other filters +and still be chosen, while the NONE filter could have a sum 1.1 times +higher than other filters and still be chosen. Unspecified weights are +taken to be 1.0, and the specified weights should probably be declining +like those above in order to emphasize recent filters over older filters. + +The filter costs specify for each filter type a relative decoding cost +to be considered when selecting row filters. This means that filters +with higher costs are less likely to be chosen over filters with lower +costs, unless their "sum of absolute differences" is that much smaller. +The costs do not necessarily reflect the exact computational speeds of +the various filters, since this would unduly influence the final image +size. + +Note that the numbers above were invented purely for this example and +are given only to help explain the function usage. Little testing has +been done to find optimum values for either the costs or the weights. + +Removing unwanted object code + +There are a bunch of #define's in pngconf.h that control what parts of +libpng are compiled. All the defines end in _SUPPORTED. If you are +never going to use a capability, you can change the #define to #undef +before recompiling libpng and save yourself code and data space, or +you can turn off individual capabilities with defines that begin with +PNG_NO_. + +In libpng-1.5.0 and later, the #define's are in pnglibconf.h instead. + +You can also turn all of the transforms and ancillary chunk capabilities +off en masse with compiler directives that define +PNG_NO_READ[or WRITE]_TRANSFORMS, or PNG_NO_READ[or WRITE]_ANCILLARY_CHUNKS, +or all four, +along with directives to turn on any of the capabilities that you do +want. The PNG_NO_READ[or WRITE]_TRANSFORMS directives disable the extra +transformations but still leave the library fully capable of reading +and writing PNG files with all known public chunks. Use of the +PNG_NO_READ[or WRITE]_ANCILLARY_CHUNKS directive produces a library +that is incapable of reading or writing ancillary chunks. If you are +not using the progressive reading capability, you can turn that off +with PNG_NO_PROGRESSIVE_READ (don't confuse this with the INTERLACING +capability, which you'll still have). + +All the reading and writing specific code are in separate files, so the +linker should only grab the files it needs. However, if you want to +make sure, or if you are building a stand alone library, all the +reading files start with pngr and all the writing files start with +pngw. The files that don't match either (like png.c, pngtrans.c, etc.) +are used for both reading and writing, and always need to be included. +The progressive reader is in pngpread.c + +If you are creating or distributing a dynamically linked library (a .so +or DLL file), you should not remove or disable any parts of the library, +as this will cause applications linked with different versions of the +library to fail if they call functions not available in your library. +The size of the library itself should not be an issue, because only +those sections that are actually used will be loaded into memory. + +Requesting debug printout + +The macro definition PNG_DEBUG can be used to request debugging +printout. Set it to an integer value in the range 0 to 3. Higher +numbers result in increasing amounts of debugging information. The +information is printed to the "stderr" file, unless another file +name is specified in the PNG_DEBUG_FILE macro definition. + +When PNG_DEBUG > 0, the following functions (macros) become available: + + png_debug(level, message) + png_debug1(level, message, p1) + png_debug2(level, message, p1, p2) + +in which "level" is compared to PNG_DEBUG to decide whether to print +the message, "message" is the formatted string to be printed, +and p1 and p2 are parameters that are to be embedded in the string +according to printf-style formatting directives. For example, + + png_debug1(2, "foo=%d\n", foo); + +is expanded to + + if (PNG_DEBUG > 2) + fprintf(PNG_DEBUG_FILE, "foo=%d\n", foo); + +When PNG_DEBUG is defined but is zero, the macros aren't defined, but you +can still use PNG_DEBUG to control your own debugging: + + #ifdef PNG_DEBUG + fprintf(stderr, ... + #endif + +When PNG_DEBUG = 1, the macros are defined, but only png_debug statements +having level = 0 will be printed. There aren't any such statements in +this version of libpng, but if you insert some they will be printed. + +VI. MNG support + +The MNG specification (available at http://www.libpng.org/pub/mng) allows +certain extensions to PNG for PNG images that are embedded in MNG datastreams. +Libpng can support some of these extensions. To enable them, use the +png_permit_mng_features() function: + + feature_set = png_permit_mng_features(png_ptr, mask) + + mask is a png_uint_32 containing the bitwise OR of the + features you want to enable. These include + PNG_FLAG_MNG_EMPTY_PLTE + PNG_FLAG_MNG_FILTER_64 + PNG_ALL_MNG_FEATURES + + feature_set is a png_uint_32 that is the bitwise AND of + your mask with the set of MNG features that is + supported by the version of libpng that you are using. + +It is an error to use this function when reading or writing a standalone +PNG file with the PNG 8-byte signature. The PNG datastream must be wrapped +in a MNG datastream. As a minimum, it must have the MNG 8-byte signature +and the MHDR and MEND chunks. Libpng does not provide support for these +or any other MNG chunks; your application must provide its own support for +them. You may wish to consider using libmng (available at +http://www.libmng.com) instead. + +VII. Changes to Libpng from version 0.88 + +It should be noted that versions of libpng later than 0.96 are not +distributed by the original libpng author, Guy Schalnat, nor by +Andreas Dilger, who had taken over from Guy during 1996 and 1997, and +distributed versions 0.89 through 0.96, but rather by another member +of the original PNG Group, Glenn Randers-Pehrson. Guy and Andreas are +still alive and well, but they have moved on to other things. + +The old libpng functions png_read_init(), png_write_init(), +png_info_init(), png_read_destroy(), and png_write_destroy() have been +moved to PNG_INTERNAL in version 0.95 to discourage their use. These +functions will be removed from libpng version 1.4.0. + +The preferred method of creating and initializing the libpng structures is +via the png_create_read_struct(), png_create_write_struct(), and +png_create_info_struct() because they isolate the size of the structures +from the application, allow version error checking, and also allow the +use of custom error handling routines during the initialization, which +the old functions do not. The functions png_read_destroy() and +png_write_destroy() do not actually free the memory that libpng +allocated for these structs, but just reset the data structures, so they +can be used instead of png_destroy_read_struct() and +png_destroy_write_struct() if you feel there is too much system overhead +allocating and freeing the png_struct for each image read. + +Setting the error callbacks via png_set_message_fn() before +png_read_init() as was suggested in libpng-0.88 is no longer supported +because this caused applications that do not use custom error functions +to fail if the png_ptr was not initialized to zero. It is still possible +to set the error callbacks AFTER png_read_init(), or to change them with +png_set_error_fn(), which is essentially the same function, but with a new +name to force compilation errors with applications that try to use the old +method. + +Starting with version 1.0.7, you can find out which version of the library +you are using at run-time: + + png_uint_32 libpng_vn = png_access_version_number(); + +The number libpng_vn is constructed from the major version, minor +version with leading zero, and release number with leading zero, +(e.g., libpng_vn for version 1.0.7 is 10007). + +You can also check which version of png.h you used when compiling your +application: + + png_uint_32 application_vn = PNG_LIBPNG_VER; + +VIII. Changes to Libpng from version 1.0.x to 1.2.x + +Support for user memory management was enabled by default. To +accomplish this, the functions png_create_read_struct_2(), +png_create_write_struct_2(), png_set_mem_fn(), png_get_mem_ptr(), +png_malloc_default(), and png_free_default() were added. + +Support for the iTXt chunk has been enabled by default as of +version 1.2.41. + +Support for certain MNG features was enabled. + +Support for numbered error messages was added. However, we never got +around to actually numbering the error messages. The function +png_set_strip_error_numbers() was added (Note: the prototype for this +function was inadvertently removed from png.h in PNG_NO_ASSEMBLER_CODE +builds of libpng-1.2.15. It was restored in libpng-1.2.36). + +The png_malloc_warn() function was added at libpng-1.2.3. This issues +a png_warning and returns NULL instead of aborting when it fails to +acquire the requested memory allocation. + +Support for setting user limits on image width and height was enabled +by default. The functions png_set_user_limits(), png_get_user_width_max(), +and png_get_user_height_max() were added at libpng-1.2.6. + +The png_set_add_alpha() function was added at libpng-1.2.7. + +The function png_set_expand_gray_1_2_4_to_8() was added at libpng-1.2.9. +Unlike png_set_gray_1_2_4_to_8(), the new function does not expand the +tRNS chunk to alpha. The png_set_gray_1_2_4_to_8() function is +deprecated. + +A number of macro definitions in support of runtime selection of +assembler code features (especially Intel MMX code support) were +added at libpng-1.2.0: + + PNG_ASM_FLAG_MMX_SUPPORT_COMPILED + PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU + PNG_ASM_FLAG_MMX_READ_COMBINE_ROW + PNG_ASM_FLAG_MMX_READ_INTERLACE + PNG_ASM_FLAG_MMX_READ_FILTER_SUB + PNG_ASM_FLAG_MMX_READ_FILTER_UP + PNG_ASM_FLAG_MMX_READ_FILTER_AVG + PNG_ASM_FLAG_MMX_READ_FILTER_PAETH + PNG_ASM_FLAGS_INITIALIZED + PNG_MMX_READ_FLAGS + PNG_MMX_FLAGS + PNG_MMX_WRITE_FLAGS + PNG_MMX_FLAGS + +We added the following functions in support of runtime +selection of assembler code features: + + png_get_mmx_flagmask() + png_set_mmx_thresholds() + png_get_asm_flags() + png_get_mmx_bitdepth_threshold() + png_get_mmx_rowbytes_threshold() + png_set_asm_flags() + +We replaced all of these functions with simple stubs in libpng-1.2.20, +when the Intel assembler code was removed due to a licensing issue. + +These macros are deprecated: + + PNG_READ_TRANSFORMS_NOT_SUPPORTED + PNG_PROGRESSIVE_READ_NOT_SUPPORTED + PNG_NO_SEQUENTIAL_READ_SUPPORTED + PNG_WRITE_TRANSFORMS_NOT_SUPPORTED + PNG_READ_ANCILLARY_CHUNKS_NOT_SUPPORTED + PNG_WRITE_ANCILLARY_CHUNKS_NOT_SUPPORTED + +They have been replaced, respectively, by: + + PNG_NO_READ_TRANSFORMS + PNG_NO_PROGRESSIVE_READ + PNG_NO_SEQUENTIAL_READ + PNG_NO_WRITE_TRANSFORMS + PNG_NO_READ_ANCILLARY_CHUNKS + PNG_NO_WRITE_ANCILLARY_CHUNKS + +PNG_MAX_UINT was replaced with PNG_UINT_31_MAX. It has been +deprecated since libpng-1.0.16 and libpng-1.2.6. + +The function + png_check_sig(sig, num) +was replaced with + !png_sig_cmp(sig, 0, num) +It has been deprecated since libpng-0.90. + +The function + png_set_gray_1_2_4_to_8() +which also expands tRNS to alpha was replaced with + png_set_expand_gray_1_2_4_to_8() +which does not. It has been deprecated since libpng-1.0.18 and 1.2.9. + +IX. Changes to Libpng from version 1.0.x/1.2.x to 1.4.x + +Private libpng prototypes and macro definitions were moved from +png.h and pngconf.h into a new pngpriv.h header file. + +Functions png_set_benign_errors(), png_benign_error(), and +png_chunk_benign_error() were added. + +Support for setting the maximum amount of memory that the application +will allocate for reading chunks was added, as a security measure. +The functions png_set_chunk_cache_max() and png_get_chunk_cache_max() +were added to the library. + +We implemented support for I/O states by adding png_ptr member io_state +and functions png_get_io_chunk_name() and png_get_io_state() in pngget.c + +We added PNG_TRANSFORM_GRAY_TO_RGB to the available high-level +input transforms. + +Checking for and reporting of errors in the IHDR chunk is more thorough. + +Support for global arrays was removed, to improve thread safety. + +Some obsolete/deprecated macros and functions have been removed. + +Typecasted NULL definitions such as + #define png_voidp_NULL (png_voidp)NULL +were eliminated. If you used these in your application, just use +NULL instead. + +The png_struct and info_struct members "trans" and "trans_values" were +changed to "trans_alpha" and "trans_color", respectively. + +The obsolete, unused pnggccrd.c and pngvcrd.c files and related makefiles +were removed. + +The PNG_1_0_X and PNG_1_2_X macros were eliminated. + +The PNG_LEGACY_SUPPORTED macro was eliminated. + +Many WIN32_WCE #ifdefs were removed. + +The functions png_read_init(info_ptr), png_write_init(info_ptr), +png_info_init(info_ptr), png_read_destroy(), and png_write_destroy() +have been removed. They have been deprecated since libpng-0.95. + +The png_permit_empty_plte() was removed. It has been deprecated +since libpng-1.0.9. Use png_permit_mng_features() instead. + +We removed the obsolete stub functions png_get_mmx_flagmask(), +png_set_mmx_thresholds(), png_get_asm_flags(), +png_get_mmx_bitdepth_threshold(), png_get_mmx_rowbytes_threshold(), +png_set_asm_flags(), and png_mmx_supported() + +We removed the obsolete png_check_sig(), png_memcpy_check(), and +png_memset_check() functions. Instead use !png_sig_cmp(), memcpy(), +and memset(), respectively. + +The function png_set_gray_1_2_4_to_8() was removed. It has been +deprecated since libpng-1.0.18 and 1.2.9, when it was replaced with +png_set_expand_gray_1_2_4_to_8() because the former function also +expanded palette images. + +Macros for png_get_uint_16, png_get_uint_32, and png_get_int_32 +were added and are used by default instead of the corresponding +functions. Unfortunately, +from libpng-1.4.0 until 1.4.4, the png_get_uint_16 macro (but not the +function) incorrectly returned a value of type png_uint_32. + +We changed the prototype for png_malloc() from + png_malloc(png_structp png_ptr, png_uint_32 size) +to + png_malloc(png_structp png_ptr, png_alloc_size_t size) + +This also applies to the prototype for the user replacement malloc_fn(). + +The png_calloc() function was added and is used in place of +of "png_malloc(); memset();" except in the case in png_read_png() +where the array consists of pointers; in this case a "for" loop is used +after the png_malloc() to set the pointers to NULL, to give robust. +behavior in case the application runs out of memory part-way through +the process. + +We changed the prototypes of png_get_compression_buffer_size() and +png_set_compression_buffer_size() to work with png_size_t instead of +png_uint_32. + +Support for numbered error messages was removed by default, since we +never got around to actually numbering the error messages. The function +png_set_strip_error_numbers() was removed from the library by default. + +The png_zalloc() and png_zfree() functions are no longer exported. +The png_zalloc() function no longer zeroes out the memory that it +allocates. + +Support for dithering was disabled by default in libpng-1.4.0, because +been well tested and doesn't actually "dither". The code was not +removed, however, and could be enabled by building libpng with +PNG_READ_DITHER_SUPPORTED defined. In libpng-1.4.2, this support +was reenabled, but the function was renamed png_set_quantize() to +reflect more accurately what it actually does. At the same time, +the PNG_DITHER_[RED,GREEN_BLUE]_BITS macros were also renamed to +PNG_QUANTIZE_[RED,GREEN,BLUE]_BITS, and PNG_READ_DITHER_SUPPORTED +was renamed to PNG_READ_QUANTIZE_SUPPORTED. + +We removed the trailing '.' from the warning and error messages. + +X. Changes to Libpng from version 1.4.x to 1.5.x + +From libpng-1.4.0 until 1.4.4, the png_get_uint_16 macro (but not the +function) incorrectly returned a value of type png_uint_32. + +A. Changes that affect users of libpng + +There are no substantial API changes between the non-deprecated parts of +the 1.4.5 API and the 1.5.0 API, however the ability to directly access +the main libpng control structures, png_struct and png_info, deprecated +in earlier versions of libpng, has been completely removed from +libpng 1.5. + +We no longer include zlib.h in png.h. Applications that need access +to information in zlib.h will need to add the '#include "zlib.h"' +directive. It does not matter whether it is placed prior to or after +the '"#include png.h"' directive. + +We moved the png_strcpy(), png_strncpy(), png_strlen(), png_memcpy(), +png_memcmp(), png_sprintf, and png_memcpy() macros into a private +header file (pngpriv.h) that is not accessible to applications. + +In png_get_iCCP, the type of "profile" was changed from png_charpp +to png_bytepp, and in png_set_iCCP, from png_charp to png_const_bytep. + +There are changes of form in png.h, including new and changed macros to +declare +parts of the API. Some API functions with arguments that are pointers to +data not modified within the function have been corrected to declare +these arguments with PNG_CONST. + +Much of the internal use of C macros to control the library build has also +changed and some of this is visible in the exported header files, in +particular the use of macros to control data and API elements visible +during application compilation may require significant revision to +application code. (It is extremely rare for an application to do this.) + +Any program that compiled against libpng 1.4 and did not use deprecated +features or access internal library structures should compile and work +against libpng 1.5. + +libpng 1.5.0 adds PNG_ PASS macros to help in the reading and writing of +interlaced images. The macros return the number of rows and columns in +each pass and information that can be used to de-interlace and (if +absolutely necessary) interlace an image. + +libpng 1.5.0 adds an API png_longjmp(png_ptr, value). This API calls +the application provided png_longjmp_ptr on the internal, but application +initialized, jmpbuf. It is provided as a convenience to avoid the need +to use the png_jmpbuf macro, which had the unnecessary side effect of +resetting the internal png_longjmp_ptr value. + +libpng 1.5.0 includes a complete fixed point API. By default this is +present along with the corresponding floating point API. In general the +fixed point API is faster and smaller than the floating point one because +the PNG file format used fixed point, not floating point. This applies +even if the library uses floating point in internal calculations. A new +macro, PNG_FLOATING_ARITHMETIC_SUPPORTED, reveals whether the library +uses floating point arithmetic (the default) or fixed point arithmetic +internally for performance critical calculations such as gamma correction. +In some cases, the gamma calculations may produce slightly different +results. This has changed the results in png_rgb_to_gray and in alpha +composition (png_set_background for example). This applies even if the +original image was already linear (gamma == 1.0) and, therefore, it is +not necessary to linearize the image. This is because libpng has *not* +been changed to optimize that case correctly, yet. + +Fixed point support for the sCAL chunk comes with an important caveat; +the sCAL specification uses a decimal encoding of floating point values +and the accuracy of PNG fixed point values is insufficient for +representation of these values. Consequently a "string" API +(png_get_sCAL_s and png_set_sCAL_s) is the only reliable way of reading +arbitrary sCAL chunks in the absence of either the floating point API or +internal floating point calculations. + +Applications no longer need to include the optional distribution header +file pngusr.h or define the corresponding macros during application +build in order to see the correct variant of the libpng API. From 1.5.0 +application code can check for the corresponding _SUPPORTED macro: + +#ifdef PNG_INCH_CONVERSIONS_SUPPORTED + /* code that uses the inch conversion APIs. */ +#endif + +This macro will only be defined if the inch conversion functions have been +compiled into libpng. The full set of macros, and whether or not support +has been compiled in, are available in the header file pnglibconf.h. +This header file is specific to the libpng build. Notice that prior to +1.5.0 the _SUPPORTED macros would always have the default definition unless +reset by pngusr.h or by explicit settings on the compiler command line. +These settings may produce compiler warnings or errors in 1.5.0 because +of macro redefinition. + +From libpng-1.4.0 until 1.4.4, the png_get_uint_16 macro (but not the +function) incorrectly returned a value of type png_uint_32. libpng 1.5.0 +is consistent with the implementation in 1.4.5 and 1.2.x (where the macro +did not exist.) + +Applications can now choose whether to use these macros or to call the +corresponding function by defining PNG_USE_READ_MACROS or +PNG_NO_USE_READ_MACROS before including png.h. Notice that this is +only supported from 1.5.0 -defining PNG_NO_USE_READ_MACROS prior to 1.5.0 + will lead to a link failure. + +B. Changes to the build and configuration of libpng + +Details of internal changes to the library code can be found in the CHANGES +file. These will be of no concern to the vast majority of library users or +builders, however the few who configure libpng to a non-default feature +set may need to change how this is done. + +There should be no need for library builders to alter build scripts if +these use the distributed build support - configure or the makefiles - +however users of the makefiles may care to update their build scripts +to build pnglibconf.h where the corresponding makefile does not do so. + +Building libpng with a non-default configuration has changed completely. +The old method using pngusr.h should still work correctly even though the +way pngusr.h is used in the build has been changed, however library +builders will probably want to examine the changes to take advantage of +new capabilities and to simplify their build system. + +B.1 Specific changes to library configuration capabilities + +The library now supports a complete fixed point implementation and can +thus be used on systems which have no floating point support or very +limited or slow support. Previously gamma correction, an essential part +of complete PNG support, required reasonably fast floating point. + +As part of this the choice of internal implementation has been made +independent of the choice of fixed versus floating point APIs and all the +missing fixed point APIs have been implemented. + +The exact mechanism used to control attributes of API functions has +changed. A single set of operating system independent macro definitions +is used and operating system specific directives are defined in +pnglibconf.h + +As part of this the mechanism used to choose procedure call standards on +those systems that allow a choice has been changed. At present this only +affects certain Microsoft (DOS, Windows) and IBM (OS/2) operating systems +running on Intel processors. As before PNGAPI is defined where required +to control the exported API functions; however, two new macros, PNGCBAPI +and PNGCAPI, are used instead for callback functions (PNGCBAPI) and +(PNGCAPI) for functions that must match a C library prototype (currently +only png_longjmp_ptr, which must match the C longjmp function.) The new +approach is documented in pngconf.h + +Despite these changes libpng 1.5.0 only supports the native C function +calling standard on those platforms tested so far (__cdecl on Microsoft +Windows). This is because the support requirements for alternative +calling conventions seem to no longer exist. Developers who find it +necessary to set PNG_API_RULE to 1 should advise the mailing list +(png-mng-implement) of this and library builders who use Openwatcom and +therefore set PNG_API_RULE to 2 should also contact the mailing list. + +A new test program, pngvalid, is provided in addition to pngtest. +pngvalid validates the arithmetic accuracy of the gamma correction +calculations and includes a number of validations of the file format. +A subset of the full range of tests is run when "make check" is done +(in the 'configure' build.) pngvalid also allows total allocated memory +usage to be evaluated and performs additional memory overwrite validation. + +Many changes to individual feature macros have been made. The following +are the changes most likely to be noticed by library builders who +configure libpng: + +1) All feature macros now have consistent naming: + +#define PNG_NO_feature turns the feature off +#define PNG_feature_SUPPORTED turns the feature on + +pnglibconf.h contains one line for each feature macro which is either: + +#define PNG_feature_SUPPORTED + +if the feature is supported or: + +/*#undef PNG_feature_SUPPORTED*/ + +if it is not. Library code consistently checks for the 'SUPPORTED' macro. +It does not, and should not, check for the 'NO' macro which will not +normally be defined even if the feature is not supported. + +Compatibility with the old names is provided as follows: + +PNG_INCH_CONVERSIONS turns on PNG_INCH_CONVERSIONS_SUPPORTED + +And the following definitions disable the corresponding feature: + +PNG_SETJMP_NOT_SUPPORTED disables SETJMP +PNG_READ_TRANSFORMS_NOT_SUPPORTED disables READ_TRANSFORMS +PNG_NO_READ_COMPOSITED_NODIV disables READ_COMPOSITE_NODIV +PNG_WRITE_TRANSFORMS_NOT_SUPPORTED disables WRITE_TRANSFORMS +PNG_READ_ANCILLARY_CHUNKS_NOT_SUPPORTED disables READ_ANCILLARY_CHUNKS +PNG_WRITE_ANCILLARY_CHUNKS_NOT_SUPPORTED disables WRITE_ANCILLARY_CHUNKS + +Library builders should remove use of the above, inconsistent, names. + +2) Warning and error message formatting was previously conditional on +the STDIO feature. The library has been changed to use the +CONSOLE_IO feature instead. This means that if CONSOLE_IO is disabled +the library no longer uses the printf(3) functions, even though the +default read/write implementations use (FILE) style stdio.h functions. + +3) Three feature macros now control the fixed/floating point decisions: + +PNG_FLOATING_POINT_SUPPORTED enables the floating point APIs + +PNG_FIXED_POINT_SUPPORTED enables the fixed point APIs; however, in +practice these are normally required internally anyway (because the PNG +file format is fixed point), therefore in most cases PNG_NO_FIXED_POINT +merely stops the function from being exported. + +PNG_FLOATING_ARITHMETIC_SUPPORTED chooses between the internal floating +point implementation or the fixed point one. Typically the fixed point +implementation is larger and slower than the floating point implementation +on a system that supports floating point, however it may be faster on a +system which lacks floating point hardware and therefore uses a software +emulation. + +4) Added PNG_{READ,WRITE}_INT_FUNCTIONS_SUPPORTED. This allows the +functions to read and write ints to be disabled independently of +PNG_USE_READ_MACROS, which allows libpng to be built with the functions +even though the default is to use the macros - this allows applications +to choose at app buildtime whether or not to use macros (previously +impossible because the functions weren't in the default build.) + +B.2 Changes to the configuration mechanism + +Prior to libpng-1.5.0 library builders who needed to configure libpng +had either to modify the exported pngconf.h header file to add system +specific configuration or had to write feature selection macros into +pngusr.h and cause this to be included into pngconf.h by defining +PNG_USER_CONFIG. The latter mechanism had the disadvantage that an +application built without PNG_USER_CONFIG defined would see the +unmodified, default, libpng API and thus would probably fail to link. + +These mechanisms still work in the configure build and in any makefile +build that builds pnglibconf.h although the feature selection macros +have changed somewhat as described above. In 1.5.0, however, pngusr.h is +processed only once, when the exported header file pnglibconf.h is built. +pngconf.h no longer includes pngusr.h, therefore it is ignored after the +build of pnglibconf.h and it is never included in an application build. + +The rarely used alternative of adding a list of feature macros to the +CFLAGS setting in the build also still works, however the macros will be +copied to pnglibconf.h and this may produce macro redefinition warnings +when the individual C files are compiled. + +All configuration now only works if pnglibconf.h is built from +scripts/pnglibconf.dfa. This requires the program awk. Brian Kernighan +(the original author of awk) maintains C source code of that awk and this +and all known later implementations (often called by subtly different +names - nawk and gawk for example) are adequate to build pnglibconf.h. +The Sun Microsystems (now Oracle) program 'awk' is an earlier version +and does not work, this may also apply to other systems that have a +functioning awk called 'nawk'. + +Configuration options are now documented in scripts/pnglibconf.dfa. This +file also includes dependency information that ensures a configuration is +consistent; that is, if a feature is switched off dependent features are +also removed. As a recommended alternative to using feature macros in +pngusr.h a system builder may also define equivalent options in pngusr.dfa +(or, indeed, any file) and add that to the configuration by setting +DFA_XTRA to the file name. The makefiles in contrib/pngminim illustrate +how to do this, and a case where pngusr.h is still required. + +XI. Detecting libpng + +The png_get_io_ptr() function has been present since libpng-0.88, has never +changed, and is unaffected by conditional compilation macros. It is the +best choice for use in configure scripts for detecting the presence of any +libpng version since 0.88. In an autoconf "configure.in" you could use + + AC_CHECK_LIB(png, png_get_io_ptr, ... + +XII. Source code repository + +Since about February 2009, version 1.2.34, libpng has been under "git" source +control. The git repository was built from old libpng-x.y.z.tar.gz files +going back to version 0.70. You can access the git repository (read only) +at + + git://libpng.git.sourceforge.net/gitroot/libpng + +or you can browse it via "gitweb" at + + http://libpng.git.sourceforge.net/git/gitweb.cgi?p=libpng + +Patches can be sent to glennrp at users.sourceforge.net or to +png-mng-implement at lists.sourceforge.net or you can upload them to +the libpng bug tracker at + + http://libpng.sourceforge.net + +We also accept patches built from the tar or zip distributions, and +simple verbal discriptions of bug fixes, reported either to the +SourceForge bug tracker or to the png-mng-implement at lists.sf.net +mailing list. + +XIII. Coding style + +Our coding style is similar to the "Allman" style, with curly +braces on separate lines: + + if (condition) + { + action; + } + + else if (another condition) + { + another action; + } + +The braces can be omitted from simple one-line actions: + + if (condition) + return (0); + +We use 3-space indentation, except for continued statements which +are usually indented the same as the first line of the statement +plus four more spaces. + +For macro definitions we use 2-space indentation, always leaving the "#" +in the first column. + + #ifndef PNG_NO_FEATURE + # ifndef PNG_FEATURE_SUPPORTED + # define PNG_FEATURE_SUPPORTED + # endif + #endif + +Comments appear with the leading "/*" at the same indentation as +the statement that follows the comment: + + /* Single-line comment */ + statement; + + /* This is a multiple-line + * comment. + */ + statement; + +Very short comments can be placed after the end of the statement +to which they pertain: + + statement; /* comment */ + +We don't use C++ style ("//") comments. We have, however, +used them in the past in some now-abandoned MMX assembler +code. + +Functions and their curly braces are not indented, and +exported functions are marked with PNGAPI: + + /* This is a public function that is visible to + * application programmers. It does thus-and-so. + */ + void PNGAPI + png_exported_function(png_ptr, png_info, foo) + { + body; + } + +The prototypes for all exported functions appear in png.h, +above the comment that says + + /* Maintainer: Put new public prototypes here ... */ + +We mark all non-exported functions with "/* PRIVATE */"": + + void /* PRIVATE */ + png_non_exported_function(png_ptr, png_info, foo) + { + body; + } + +The prototypes for non-exported functions (except for those in +pngtest) appear in +pngpriv.h +above the comment that says + + /* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */ + +To avoid polluting the global namespace, the names of all exported +functions and variables begin with "png_", and all publicly visible C +preprocessor macros begin with "PNG_". We request that applications that +use libpng *not* begin any of their own symbols with either of these strings. + +We put a space after each comma and after each semicolon +in "for" statements, and we put spaces before and after each +C binary operator and after "for" or "while", and before +"?". We don't put a space between a typecast and the expression +being cast, nor do we put one between a function name and the +left parenthesis that follows it: + + for (i = 2; i > 0; --i) + y[i] = a(x) + (int)b; + +We prefer #ifdef and #ifndef to #if defined() and if !defined() +when there is only one macro being tested. + +We do not use the TAB character for indentation in the C sources. + +Lines do not exceed 80 characters. + +Other rules can be inferred by inspecting the libpng source. + +XIV. Y2K Compliance in libpng + +February 3, 2011 + +Since the PNG Development group is an ad-hoc body, we can't make +an official declaration. + +This is your unofficial assurance that libpng from version 0.71 and +upward through 1.5.1 are Y2K compliant. It is my belief that earlier +versions were also Y2K compliant. + +Libpng only has three year fields. One is a 2-byte unsigned integer that +will hold years up to 65535. The other two hold the date in text +format, and will hold years up to 9999. + +The integer is + "png_uint_16 year" in png_time_struct. + +The strings are + "png_charp time_buffer" in png_struct and + "near_time_buffer", which is a local character string in png.c. + +There are seven time-related functions: + + png_convert_to_rfc_1123() in png.c + (formerly png_convert_to_rfc_1152() in error) + png_convert_from_struct_tm() in pngwrite.c, called + in pngwrite.c + png_convert_from_time_t() in pngwrite.c + png_get_tIME() in pngget.c + png_handle_tIME() in pngrutil.c, called in pngread.c + png_set_tIME() in pngset.c + png_write_tIME() in pngwutil.c, called in pngwrite.c + +All appear to handle dates properly in a Y2K environment. The +png_convert_from_time_t() function calls gmtime() to convert from system +clock time, which returns (year - 1900), which we properly convert to +the full 4-digit year. There is a possibility that applications using +libpng are not passing 4-digit years into the png_convert_to_rfc_1123() +function, or that they are incorrectly passing only a 2-digit year +instead of "year - 1900" into the png_convert_from_struct_tm() function, +but this is not under our control. The libpng documentation has always +stated that it works with 4-digit years, and the APIs have been +documented as such. + +The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned +integer to hold the year, and can hold years as large as 65535. + +zlib, upon which libpng depends, is also Y2K compliant. It contains +no date-related code. + + + Glenn Randers-Pehrson + libpng maintainer + PNG Development Group diff --git a/programs/develop/libraries/libpng/png.c b/programs/develop/libraries/libpng/png.c new file mode 100644 index 0000000000..764f47c20c --- /dev/null +++ b/programs/develop/libraries/libpng/png.c @@ -0,0 +1,2362 @@ + +/* png.c - location for general purpose libpng functions + * + * Last changed in libpng 1.5.1 [February 3, 2011] + * Copyright (c) 1998-2011 Glenn Randers-Pehrson + * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) + * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) + * + * This code is released under the libpng license. + * For conditions of distribution and use, see the disclaimer + * and license in png.h + */ + +#include "pngpriv.h" + +/* Generate a compiler error if there is an old png.h in the search path. */ +typedef png_libpng_version_1_5_1 Your_png_h_is_not_version_1_5_1; + +/* Tells libpng that we have already handled the first "num_bytes" bytes + * of the PNG file signature. If the PNG data is embedded into another + * stream we can set num_bytes = 8 so that libpng will not attempt to read + * or write any of the magic bytes before it starts on the IHDR. + */ + +#ifdef PNG_READ_SUPPORTED +void PNGAPI +png_set_sig_bytes(png_structp png_ptr, int num_bytes) +{ + png_debug(1, "in png_set_sig_bytes"); + + if (png_ptr == NULL) + return; + + if (num_bytes > 8) + png_error(png_ptr, "Too many bytes for PNG signature"); + + png_ptr->sig_bytes = (png_byte)(num_bytes < 0 ? 0 : num_bytes); +} + +/* Checks whether the supplied bytes match the PNG signature. We allow + * checking less than the full 8-byte signature so that those apps that + * already read the first few bytes of a file to determine the file type + * can simply check the remaining bytes for extra assurance. Returns + * an integer less than, equal to, or greater than zero if sig is found, + * respectively, to be less than, to match, or be greater than the correct + * PNG signature (this is the same behaviour as strcmp, memcmp, etc). + */ +int PNGAPI +png_sig_cmp(png_const_bytep sig, png_size_t start, png_size_t num_to_check) +{ + png_byte png_signature[8] = {137, 80, 78, 71, 13, 10, 26, 10}; + + if (num_to_check > 8) + num_to_check = 8; + + else if (num_to_check < 1) + return (-1); + + if (start > 7) + return (-1); + + if (start + num_to_check > 8) + num_to_check = 8 - start; + + return ((int)(png_memcmp(&sig[start], &png_signature[start], num_to_check))); +} + +#endif /* PNG_READ_SUPPORTED */ + +#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) +/* Function to allocate memory for zlib */ +PNG_FUNCTION(voidpf /* PRIVATE */, +png_zalloc,(voidpf png_ptr, uInt items, uInt size),PNG_ALLOCATED) +{ + png_voidp ptr; + png_structp p=(png_structp)png_ptr; + png_uint_32 save_flags=p->flags; + png_alloc_size_t num_bytes; + + if (png_ptr == NULL) + return (NULL); + + if (items > PNG_UINT_32_MAX/size) + { + png_warning (p, "Potential overflow in png_zalloc()"); + return (NULL); + } + num_bytes = (png_alloc_size_t)items * size; + + p->flags|=PNG_FLAG_MALLOC_NULL_MEM_OK; + ptr = (png_voidp)png_malloc((png_structp)png_ptr, num_bytes); + p->flags=save_flags; + + return ((voidpf)ptr); +} + +/* Function to free memory for zlib */ +void /* PRIVATE */ +png_zfree(voidpf png_ptr, voidpf ptr) +{ + png_free((png_structp)png_ptr, (png_voidp)ptr); +} + +/* Reset the CRC variable to 32 bits of 1's. Care must be taken + * in case CRC is > 32 bits to leave the top bits 0. + */ +void /* PRIVATE */ +png_reset_crc(png_structp png_ptr) +{ + png_ptr->crc = crc32(0, Z_NULL, 0); +} + +/* Calculate the CRC over a section of data. We can only pass as + * much data to this routine as the largest single buffer size. We + * also check that this data will actually be used before going to the + * trouble of calculating it. + */ +void /* PRIVATE */ +png_calculate_crc(png_structp png_ptr, png_const_bytep ptr, png_size_t length) +{ + int need_crc = 1; + + if (png_ptr->chunk_name[0] & 0x20) /* ancillary */ + { + if ((png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_MASK) == + (PNG_FLAG_CRC_ANCILLARY_USE | PNG_FLAG_CRC_ANCILLARY_NOWARN)) + need_crc = 0; + } + + else /* critical */ + { + if (png_ptr->flags & PNG_FLAG_CRC_CRITICAL_IGNORE) + need_crc = 0; + } + + if (need_crc) + png_ptr->crc = crc32(png_ptr->crc, ptr, (uInt)length); +} + +/* Allocate the memory for an info_struct for the application. We don't + * really need the png_ptr, but it could potentially be useful in the + * future. This should be used in favour of malloc(png_sizeof(png_info)) + * and png_info_init() so that applications that want to use a shared + * libpng don't have to be recompiled if png_info changes size. + */ +PNG_FUNCTION(png_infop,PNGAPI +png_create_info_struct,(png_structp png_ptr),PNG_ALLOCATED) +{ + png_infop info_ptr; + + png_debug(1, "in png_create_info_struct"); + + if (png_ptr == NULL) + return (NULL); + +#ifdef PNG_USER_MEM_SUPPORTED + info_ptr = (png_infop)png_create_struct_2(PNG_STRUCT_INFO, + png_ptr->malloc_fn, png_ptr->mem_ptr); +#else + info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO); +#endif + if (info_ptr != NULL) + png_info_init_3(&info_ptr, png_sizeof(png_info)); + + return (info_ptr); +} + +/* This function frees the memory associated with a single info struct. + * Normally, one would use either png_destroy_read_struct() or + * png_destroy_write_struct() to free an info struct, but this may be + * useful for some applications. + */ +void PNGAPI +png_destroy_info_struct(png_structp png_ptr, png_infopp info_ptr_ptr) +{ + png_infop info_ptr = NULL; + + png_debug(1, "in png_destroy_info_struct"); + + if (png_ptr == NULL) + return; + + if (info_ptr_ptr != NULL) + info_ptr = *info_ptr_ptr; + + if (info_ptr != NULL) + { + png_info_destroy(png_ptr, info_ptr); + +#ifdef PNG_USER_MEM_SUPPORTED + png_destroy_struct_2((png_voidp)info_ptr, png_ptr->free_fn, + png_ptr->mem_ptr); +#else + png_destroy_struct((png_voidp)info_ptr); +#endif + *info_ptr_ptr = NULL; + } +} + +/* Initialize the info structure. This is now an internal function (0.89) + * and applications using it are urged to use png_create_info_struct() + * instead. + */ + +void PNGAPI +png_info_init_3(png_infopp ptr_ptr, png_size_t png_info_struct_size) +{ + png_infop info_ptr = *ptr_ptr; + + png_debug(1, "in png_info_init_3"); + + if (info_ptr == NULL) + return; + + if (png_sizeof(png_info) > png_info_struct_size) + { + png_destroy_struct(info_ptr); + info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO); + *ptr_ptr = info_ptr; + } + + /* Set everything to 0 */ + png_memset(info_ptr, 0, png_sizeof(png_info)); +} + +void PNGAPI +png_data_freer(png_structp png_ptr, png_infop info_ptr, + int freer, png_uint_32 mask) +{ + png_debug(1, "in png_data_freer"); + + if (png_ptr == NULL || info_ptr == NULL) + return; + + if (freer == PNG_DESTROY_WILL_FREE_DATA) + info_ptr->free_me |= mask; + + else if (freer == PNG_USER_WILL_FREE_DATA) + info_ptr->free_me &= ~mask; + + else + png_warning(png_ptr, + "Unknown freer parameter in png_data_freer"); +} + +void PNGAPI +png_free_data(png_structp png_ptr, png_infop info_ptr, png_uint_32 mask, + int num) +{ + png_debug(1, "in png_free_data"); + + if (png_ptr == NULL || info_ptr == NULL) + return; + +#ifdef PNG_TEXT_SUPPORTED + /* Free text item num or (if num == -1) all text items */ + if ((mask & PNG_FREE_TEXT) & info_ptr->free_me) + { + if (num != -1) + { + if (info_ptr->text && info_ptr->text[num].key) + { + png_free(png_ptr, info_ptr->text[num].key); + info_ptr->text[num].key = NULL; + } + } + + else + { + int i; + for (i = 0; i < info_ptr->num_text; i++) + png_free_data(png_ptr, info_ptr, PNG_FREE_TEXT, i); + png_free(png_ptr, info_ptr->text); + info_ptr->text = NULL; + info_ptr->num_text=0; + } + } +#endif + +#ifdef PNG_tRNS_SUPPORTED + /* Free any tRNS entry */ + if ((mask & PNG_FREE_TRNS) & info_ptr->free_me) + { + png_free(png_ptr, info_ptr->trans_alpha); + info_ptr->trans_alpha = NULL; + info_ptr->valid &= ~PNG_INFO_tRNS; + } +#endif + +#ifdef PNG_sCAL_SUPPORTED + /* Free any sCAL entry */ + if ((mask & PNG_FREE_SCAL) & info_ptr->free_me) + { +#if defined(PNG_FIXED_POINT_SUPPORTED) && !defined(PNG_FLOATING_POINT_SUPPORTED) + png_free(png_ptr, info_ptr->scal_s_width); + png_free(png_ptr, info_ptr->scal_s_height); + info_ptr->scal_s_width = NULL; + info_ptr->scal_s_height = NULL; +#endif + info_ptr->valid &= ~PNG_INFO_sCAL; + } +#endif + +#ifdef PNG_pCAL_SUPPORTED + /* Free any pCAL entry */ + if ((mask & PNG_FREE_PCAL) & info_ptr->free_me) + { + png_free(png_ptr, info_ptr->pcal_purpose); + png_free(png_ptr, info_ptr->pcal_units); + info_ptr->pcal_purpose = NULL; + info_ptr->pcal_units = NULL; + if (info_ptr->pcal_params != NULL) + { + int i; + for (i = 0; i < (int)info_ptr->pcal_nparams; i++) + { + png_free(png_ptr, info_ptr->pcal_params[i]); + info_ptr->pcal_params[i] = NULL; + } + png_free(png_ptr, info_ptr->pcal_params); + info_ptr->pcal_params = NULL; + } + info_ptr->valid &= ~PNG_INFO_pCAL; + } +#endif + +#ifdef PNG_iCCP_SUPPORTED + /* Free any iCCP entry */ + if ((mask & PNG_FREE_ICCP) & info_ptr->free_me) + { + png_free(png_ptr, info_ptr->iccp_name); + png_free(png_ptr, info_ptr->iccp_profile); + info_ptr->iccp_name = NULL; + info_ptr->iccp_profile = NULL; + info_ptr->valid &= ~PNG_INFO_iCCP; + } +#endif + +#ifdef PNG_sPLT_SUPPORTED + /* Free a given sPLT entry, or (if num == -1) all sPLT entries */ + if ((mask & PNG_FREE_SPLT) & info_ptr->free_me) + { + if (num != -1) + { + if (info_ptr->splt_palettes) + { + png_free(png_ptr, info_ptr->splt_palettes[num].name); + png_free(png_ptr, info_ptr->splt_palettes[num].entries); + info_ptr->splt_palettes[num].name = NULL; + info_ptr->splt_palettes[num].entries = NULL; + } + } + + else + { + if (info_ptr->splt_palettes_num) + { + int i; + for (i = 0; i < (int)info_ptr->splt_palettes_num; i++) + png_free_data(png_ptr, info_ptr, PNG_FREE_SPLT, i); + + png_free(png_ptr, info_ptr->splt_palettes); + info_ptr->splt_palettes = NULL; + info_ptr->splt_palettes_num = 0; + } + info_ptr->valid &= ~PNG_INFO_sPLT; + } + } +#endif + +#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED + if (png_ptr->unknown_chunk.data) + { + png_free(png_ptr, png_ptr->unknown_chunk.data); + png_ptr->unknown_chunk.data = NULL; + } + + if ((mask & PNG_FREE_UNKN) & info_ptr->free_me) + { + if (num != -1) + { + if (info_ptr->unknown_chunks) + { + png_free(png_ptr, info_ptr->unknown_chunks[num].data); + info_ptr->unknown_chunks[num].data = NULL; + } + } + + else + { + int i; + + if (info_ptr->unknown_chunks_num) + { + for (i = 0; i < info_ptr->unknown_chunks_num; i++) + png_free_data(png_ptr, info_ptr, PNG_FREE_UNKN, i); + + png_free(png_ptr, info_ptr->unknown_chunks); + info_ptr->unknown_chunks = NULL; + info_ptr->unknown_chunks_num = 0; + } + } + } +#endif + +#ifdef PNG_hIST_SUPPORTED + /* Free any hIST entry */ + if ((mask & PNG_FREE_HIST) & info_ptr->free_me) + { + png_free(png_ptr, info_ptr->hist); + info_ptr->hist = NULL; + info_ptr->valid &= ~PNG_INFO_hIST; + } +#endif + + /* Free any PLTE entry that was internally allocated */ + if ((mask & PNG_FREE_PLTE) & info_ptr->free_me) + { + png_zfree(png_ptr, info_ptr->palette); + info_ptr->palette = NULL; + info_ptr->valid &= ~PNG_INFO_PLTE; + info_ptr->num_palette = 0; + } + +#ifdef PNG_INFO_IMAGE_SUPPORTED + /* Free any image bits attached to the info structure */ + if ((mask & PNG_FREE_ROWS) & info_ptr->free_me) + { + if (info_ptr->row_pointers) + { + int row; + for (row = 0; row < (int)info_ptr->height; row++) + { + png_free(png_ptr, info_ptr->row_pointers[row]); + info_ptr->row_pointers[row] = NULL; + } + png_free(png_ptr, info_ptr->row_pointers); + info_ptr->row_pointers = NULL; + } + info_ptr->valid &= ~PNG_INFO_IDAT; + } +#endif + + if (num != -1) + mask &= ~PNG_FREE_MUL; + + info_ptr->free_me &= ~mask; +} + +/* This is an internal routine to free any memory that the info struct is + * pointing to before re-using it or freeing the struct itself. Recall + * that png_free() checks for NULL pointers for us. + */ +void /* PRIVATE */ +png_info_destroy(png_structp png_ptr, png_infop info_ptr) +{ + png_debug(1, "in png_info_destroy"); + + png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1); + +#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED + if (png_ptr->num_chunk_list) + { + png_free(png_ptr, png_ptr->chunk_list); + png_ptr->chunk_list = NULL; + png_ptr->num_chunk_list = 0; + } +#endif + + png_info_init_3(&info_ptr, png_sizeof(png_info)); +} +#endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */ + +/* This function returns a pointer to the io_ptr associated with the user + * functions. The application should free any memory associated with this + * pointer before png_write_destroy() or png_read_destroy() are called. + */ +png_voidp PNGAPI +png_get_io_ptr(png_structp png_ptr) +{ + if (png_ptr == NULL) + return (NULL); + + return (png_ptr->io_ptr); +} + +#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) +# ifdef PNG_STDIO_SUPPORTED +/* Initialize the default input/output functions for the PNG file. If you + * use your own read or write routines, you can call either png_set_read_fn() + * or png_set_write_fn() instead of png_init_io(). If you have defined + * PNG_NO_STDIO, you must use a function of your own because "FILE *" isn't + * necessarily available. + */ +void PNGAPI +png_init_io(png_structp png_ptr, png_FILE_p fp) +{ + png_debug(1, "in png_init_io"); + + if (png_ptr == NULL) + return; + + png_ptr->io_ptr = (png_voidp)fp; +} +# endif + +# ifdef PNG_TIME_RFC1123_SUPPORTED +/* Convert the supplied time into an RFC 1123 string suitable for use in + * a "Creation Time" or other text-based time string. + */ +png_const_charp PNGAPI +png_convert_to_rfc1123(png_structp png_ptr, png_const_timep ptime) +{ + static PNG_CONST char short_months[12][4] = + {"Jan", "Feb", "Mar", "Apr", "May", "Jun", + "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"}; + + if (png_ptr == NULL) + return (NULL); + + if (png_ptr->time_buffer == NULL) + { + png_ptr->time_buffer = (png_charp)png_malloc(png_ptr, (png_uint_32)(29* + png_sizeof(char))); + } + +# ifdef USE_FAR_KEYWORD + { + char near_time_buf[29]; + png_snprintf6(near_time_buf, 29, "%d %s %d %02d:%02d:%02d +0000", + ptime->day % 32, short_months[(ptime->month - 1) % 12], + ptime->year, ptime->hour % 24, ptime->minute % 60, + ptime->second % 61); + png_memcpy(png_ptr->time_buffer, near_time_buf, + 29*png_sizeof(char)); + } +# else + png_snprintf6(png_ptr->time_buffer, 29, "%d %s %d %02d:%02d:%02d +0000", + ptime->day % 32, short_months[(ptime->month - 1) % 12], + ptime->year, ptime->hour % 24, ptime->minute % 60, + ptime->second % 61); +# endif + return png_ptr->time_buffer; +} +# endif /* PNG_TIME_RFC1123_SUPPORTED */ + +#endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */ + +png_const_charp PNGAPI +png_get_copyright(png_const_structp png_ptr) +{ + PNG_UNUSED(png_ptr) /* Silence compiler warning about unused png_ptr */ +#ifdef PNG_STRING_COPYRIGHT + return PNG_STRING_COPYRIGHT +#else +# ifdef __STDC__ + return PNG_STRING_NEWLINE \ + "libpng version 1.5.1 - February 3, 2011" PNG_STRING_NEWLINE \ + "Copyright (c) 1998-2011 Glenn Randers-Pehrson" PNG_STRING_NEWLINE \ + "Copyright (c) 1996-1997 Andreas Dilger" PNG_STRING_NEWLINE \ + "Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc." \ + PNG_STRING_NEWLINE; +# else + return "libpng version 1.5.1 - February 3, 2011\ + Copyright (c) 1998-2011 Glenn Randers-Pehrson\ + Copyright (c) 1996-1997 Andreas Dilger\ + Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc."; +# endif +#endif +} + +/* The following return the library version as a short string in the + * format 1.0.0 through 99.99.99zz. To get the version of *.h files + * used with your application, print out PNG_LIBPNG_VER_STRING, which + * is defined in png.h. + * Note: now there is no difference between png_get_libpng_ver() and + * png_get_header_ver(). Due to the version_nn_nn_nn typedef guard, + * it is guaranteed that png.c uses the correct version of png.h. + */ +png_const_charp PNGAPI +png_get_libpng_ver(png_const_structp png_ptr) +{ + /* Version of *.c files used when building libpng */ + return png_get_header_ver(png_ptr); +} + +png_const_charp PNGAPI +png_get_header_ver(png_const_structp png_ptr) +{ + /* Version of *.h files used when building libpng */ + PNG_UNUSED(png_ptr) /* Silence compiler warning about unused png_ptr */ + return PNG_LIBPNG_VER_STRING; +} + +png_const_charp PNGAPI +png_get_header_version(png_const_structp png_ptr) +{ + /* Returns longer string containing both version and date */ + PNG_UNUSED(png_ptr) /* Silence compiler warning about unused png_ptr */ +#ifdef __STDC__ + return PNG_HEADER_VERSION_STRING +# ifndef PNG_READ_SUPPORTED + " (NO READ SUPPORT)" +# endif + PNG_STRING_NEWLINE; +#else + return PNG_HEADER_VERSION_STRING; +#endif +} + +#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) +# ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED +int PNGAPI +png_handle_as_unknown(png_structp png_ptr, png_const_bytep chunk_name) +{ + /* Check chunk_name and return "keep" value if it's on the list, else 0 */ + int i; + png_bytep p; + if (png_ptr == NULL || chunk_name == NULL || png_ptr->num_chunk_list<=0) + return 0; + + p = png_ptr->chunk_list + png_ptr->num_chunk_list*5 - 5; + for (i = png_ptr->num_chunk_list; i; i--, p -= 5) + if (!png_memcmp(chunk_name, p, 4)) + return ((int)*(p + 4)); + return 0; +} +# endif +#endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */ + +#ifdef PNG_READ_SUPPORTED +/* This function, added to libpng-1.0.6g, is untested. */ +int PNGAPI +png_reset_zstream(png_structp png_ptr) +{ + if (png_ptr == NULL) + return Z_STREAM_ERROR; + + return (inflateReset(&png_ptr->zstream)); +} +#endif /* PNG_READ_SUPPORTED */ + +/* This function was added to libpng-1.0.7 */ +png_uint_32 PNGAPI +png_access_version_number(void) +{ + /* Version of *.c files used when building libpng */ + return((png_uint_32)PNG_LIBPNG_VER); +} + + + +#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) +# ifdef PNG_SIZE_T +/* Added at libpng version 1.2.6 */ + PNG_EXTERN png_size_t PNGAPI png_convert_size PNGARG((size_t size)); +png_size_t PNGAPI +png_convert_size(size_t size) +{ + if (size > (png_size_t)-1) + PNG_ABORT(); /* We haven't got access to png_ptr, so no png_error() */ + + return ((png_size_t)size); +} +# endif /* PNG_SIZE_T */ + +/* Added at libpng version 1.2.34 and 1.4.0 (moved from pngset.c) */ +# ifdef PNG_CHECK_cHRM_SUPPORTED + +int /* PRIVATE */ +png_check_cHRM_fixed(png_structp png_ptr, + png_fixed_point white_x, png_fixed_point white_y, png_fixed_point red_x, + png_fixed_point red_y, png_fixed_point green_x, png_fixed_point green_y, + png_fixed_point blue_x, png_fixed_point blue_y) +{ + int ret = 1; + unsigned long xy_hi,xy_lo,yx_hi,yx_lo; + + png_debug(1, "in function png_check_cHRM_fixed"); + + if (png_ptr == NULL) + return 0; + + if (white_x < 0 || white_y <= 0 || + red_x < 0 || red_y < 0 || + green_x < 0 || green_y < 0 || + blue_x < 0 || blue_y < 0) + { + png_warning(png_ptr, + "Ignoring attempt to set negative chromaticity value"); + ret = 0; + } + if (white_x > (png_fixed_point)PNG_UINT_31_MAX || + white_y > (png_fixed_point)PNG_UINT_31_MAX || + red_x > (png_fixed_point)PNG_UINT_31_MAX || + red_y > (png_fixed_point)PNG_UINT_31_MAX || + green_x > (png_fixed_point)PNG_UINT_31_MAX || + green_y > (png_fixed_point)PNG_UINT_31_MAX || + blue_x > (png_fixed_point)PNG_UINT_31_MAX || + blue_y > (png_fixed_point)PNG_UINT_31_MAX ) + { + png_warning(png_ptr, + "Ignoring attempt to set chromaticity value exceeding 21474.83"); + ret = 0; + } + if (white_x > 100000L - white_y) + { + png_warning(png_ptr, "Invalid cHRM white point"); + ret = 0; + } + + if (red_x > 100000L - red_y) + { + png_warning(png_ptr, "Invalid cHRM red point"); + ret = 0; + } + + if (green_x > 100000L - green_y) + { + png_warning(png_ptr, "Invalid cHRM green point"); + ret = 0; + } + + if (blue_x > 100000L - blue_y) + { + png_warning(png_ptr, "Invalid cHRM blue point"); + ret = 0; + } + + png_64bit_product(green_x - red_x, blue_y - red_y, &xy_hi, &xy_lo); + png_64bit_product(green_y - red_y, blue_x - red_x, &yx_hi, &yx_lo); + + if (xy_hi == yx_hi && xy_lo == yx_lo) + { + png_warning(png_ptr, + "Ignoring attempt to set cHRM RGB triangle with zero area"); + ret = 0; + } + + return ret; +} +# endif /* PNG_CHECK_cHRM_SUPPORTED */ + +void /* PRIVATE */ +png_check_IHDR(png_structp png_ptr, + png_uint_32 width, png_uint_32 height, int bit_depth, + int color_type, int interlace_type, int compression_type, + int filter_type) +{ + int error = 0; + + /* Check for width and height valid values */ + if (width == 0) + { + png_warning(png_ptr, "Image width is zero in IHDR"); + error = 1; + } + + if (height == 0) + { + png_warning(png_ptr, "Image height is zero in IHDR"); + error = 1; + } + +# ifdef PNG_SET_USER_LIMITS_SUPPORTED + if (width > png_ptr->user_width_max || width > PNG_USER_WIDTH_MAX) + +# else + if (width > PNG_USER_WIDTH_MAX) +# endif + { + png_warning(png_ptr, "Image width exceeds user limit in IHDR"); + error = 1; + } + +# ifdef PNG_SET_USER_LIMITS_SUPPORTED + if (height > png_ptr->user_height_max || height > PNG_USER_HEIGHT_MAX) +# else + if (height > PNG_USER_HEIGHT_MAX) +# endif + { + png_warning(png_ptr, "Image height exceeds user limit in IHDR"); + error = 1; + } + + if (width > PNG_UINT_31_MAX) + { + png_warning(png_ptr, "Invalid image width in IHDR"); + error = 1; + } + + if (height > PNG_UINT_31_MAX) + { + png_warning(png_ptr, "Invalid image height in IHDR"); + error = 1; + } + + if (width > (PNG_UINT_32_MAX + >> 3) /* 8-byte RGBA pixels */ + - 48 /* bigrowbuf hack */ + - 1 /* filter byte */ + - 7*8 /* rounding of width to multiple of 8 pixels */ + - 8) /* extra max_pixel_depth pad */ + png_warning(png_ptr, "Width is too large for libpng to process pixels"); + + /* Check other values */ + if (bit_depth != 1 && bit_depth != 2 && bit_depth != 4 && + bit_depth != 8 && bit_depth != 16) + { + png_warning(png_ptr, "Invalid bit depth in IHDR"); + error = 1; + } + + if (color_type < 0 || color_type == 1 || + color_type == 5 || color_type > 6) + { + png_warning(png_ptr, "Invalid color type in IHDR"); + error = 1; + } + + if (((color_type == PNG_COLOR_TYPE_PALETTE) && bit_depth > 8) || + ((color_type == PNG_COLOR_TYPE_RGB || + color_type == PNG_COLOR_TYPE_GRAY_ALPHA || + color_type == PNG_COLOR_TYPE_RGB_ALPHA) && bit_depth < 8)) + { + png_warning(png_ptr, "Invalid color type/bit depth combination in IHDR"); + error = 1; + } + + if (interlace_type >= PNG_INTERLACE_LAST) + { + png_warning(png_ptr, "Unknown interlace method in IHDR"); + error = 1; + } + + if (compression_type != PNG_COMPRESSION_TYPE_BASE) + { + png_warning(png_ptr, "Unknown compression method in IHDR"); + error = 1; + } + +# ifdef PNG_MNG_FEATURES_SUPPORTED + /* Accept filter_method 64 (intrapixel differencing) only if + * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and + * 2. Libpng did not read a PNG signature (this filter_method is only + * used in PNG datastreams that are embedded in MNG datastreams) and + * 3. The application called png_permit_mng_features with a mask that + * included PNG_FLAG_MNG_FILTER_64 and + * 4. The filter_method is 64 and + * 5. The color_type is RGB or RGBA + */ + if ((png_ptr->mode & PNG_HAVE_PNG_SIGNATURE) && + png_ptr->mng_features_permitted) + png_warning(png_ptr, "MNG features are not allowed in a PNG datastream"); + + if (filter_type != PNG_FILTER_TYPE_BASE) + { + if (!((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) && + (filter_type == PNG_INTRAPIXEL_DIFFERENCING) && + ((png_ptr->mode & PNG_HAVE_PNG_SIGNATURE) == 0) && + (color_type == PNG_COLOR_TYPE_RGB || + color_type == PNG_COLOR_TYPE_RGB_ALPHA))) + { + png_warning(png_ptr, "Unknown filter method in IHDR"); + error = 1; + } + + if (png_ptr->mode & PNG_HAVE_PNG_SIGNATURE) + { + png_warning(png_ptr, "Invalid filter method in IHDR"); + error = 1; + } + } + +# else + if (filter_type != PNG_FILTER_TYPE_BASE) + { + png_warning(png_ptr, "Unknown filter method in IHDR"); + error = 1; + } +# endif + + if (error == 1) + png_error(png_ptr, "Invalid IHDR data"); +} + +#if defined(PNG_sCAL_SUPPORTED) || defined(PNG_pCAL_SUPPORTED) +/* ASCII to fp functions */ +/* Check an ASCII formated floating point value, see the more detailed + * comments in pngpriv.h + */ +/* The following is used internally to preserve the 'valid' flag */ +#define png_fp_add(state, flags) ((state) |= (flags)) +#define png_fp_set(state, value)\ + ((state) = (value) | ((state) & PNG_FP_WAS_VALID)) + +/* Internal type codes: bits above the base state! */ +#define PNG_FP_SIGN 0 /* [+-] */ +#define PNG_FP_DOT 4 /* . */ +#define PNG_FP_DIGIT 8 /* [0123456789] */ +#define PNG_FP_E 12 /* [Ee] */ + +int /* PRIVATE */ +png_check_fp_number(png_const_charp string, png_size_t size, int *statep, + png_size_tp whereami) +{ + int state = *statep; + png_size_t i = *whereami; + + while (i < size) + { + int type; + /* First find the type of the next character */ + { + char ch = string[i]; + + if (ch >= 48 && ch <= 57) + type = PNG_FP_DIGIT; + + else switch (ch) + { + case 43: case 45: type = PNG_FP_SIGN; break; + case 46: type = PNG_FP_DOT; break; + case 69: case 101: type = PNG_FP_E; break; + default: goto PNG_FP_End; + } + } + + /* Now deal with this type according to the current + * state, the type is arranged to not overlap the + * bits of the PNG_FP_STATE. + */ + switch ((state & PNG_FP_STATE) + type) + { + case PNG_FP_INTEGER + PNG_FP_SIGN: + if (state & PNG_FP_SAW_ANY) + goto PNG_FP_End; /* not a part of the number */ + + png_fp_add(state, PNG_FP_SAW_SIGN); + break; + + case PNG_FP_INTEGER + PNG_FP_DOT: + /* Ok as trailer, ok as lead of fraction. */ + if (state & PNG_FP_SAW_DOT) /* two dots */ + goto PNG_FP_End; + + else if (state & PNG_FP_SAW_DIGIT) /* trailing dot? */ + png_fp_add(state, PNG_FP_SAW_DOT); + + else + png_fp_set(state, PNG_FP_FRACTION | PNG_FP_SAW_DOT); + + break; + + case PNG_FP_INTEGER + PNG_FP_DIGIT: + if (state & PNG_FP_SAW_DOT) /* delayed fraction */ + png_fp_set(state, PNG_FP_FRACTION | PNG_FP_SAW_DOT); + + png_fp_add(state, PNG_FP_SAW_DIGIT + PNG_FP_WAS_VALID); + + break; + case PNG_FP_INTEGER + PNG_FP_E: + if ((state & PNG_FP_SAW_DIGIT) == 0) + goto PNG_FP_End; + + png_fp_set(state, PNG_FP_EXPONENT); + + break; + + /* case PNG_FP_FRACTION + PNG_FP_SIGN: + goto PNG_FP_End; ** no sign in exponent */ + + /* case PNG_FP_FRACTION + PNG_FP_DOT: + goto PNG_FP_End; ** Because SAW_DOT is always set */ + + case PNG_FP_FRACTION + PNG_FP_DIGIT: + png_fp_add(state, PNG_FP_SAW_DIGIT + PNG_FP_WAS_VALID); + break; + + case PNG_FP_FRACTION + PNG_FP_E: + /* This is correct because the trailing '.' on an + * integer is handled above - so we can only get here + * with the sequence ".E" (with no preceding digits). + */ + if ((state & PNG_FP_SAW_DIGIT) == 0) + goto PNG_FP_End; + + png_fp_set(state, PNG_FP_EXPONENT); + + break; + + case PNG_FP_EXPONENT + PNG_FP_SIGN: + if (state & PNG_FP_SAW_ANY) + goto PNG_FP_End; /* not a part of the number */ + + png_fp_add(state, PNG_FP_SAW_SIGN); + + break; + + /* case PNG_FP_EXPONENT + PNG_FP_DOT: + goto PNG_FP_End; */ + + case PNG_FP_EXPONENT + PNG_FP_DIGIT: + png_fp_add(state, PNG_FP_SAW_DIGIT + PNG_FP_WAS_VALID); + + break; + + /* case PNG_FP_EXPONEXT + PNG_FP_E: + goto PNG_FP_End; */ + + default: goto PNG_FP_End; /* I.e. break 2 */ + } + + /* The character seems ok, continue. */ + ++i; + } + +PNG_FP_End: + /* Here at the end, update the state and return the correct + * return code. + */ + *statep = state; + *whereami = i; + + return (state & PNG_FP_SAW_DIGIT) != 0; +} + + +/* The same but for a complete string. */ +int +png_check_fp_string(png_const_charp string, png_size_t size) +{ + int state=0; + png_size_t char_index=0; + + return png_check_fp_number(string, size, &state, &char_index) && + (char_index == size || string[char_index] == 0); +} +#endif /* pCAL or sCAL */ + +#ifdef PNG_READ_sCAL_SUPPORTED +# ifdef PNG_FLOATING_POINT_SUPPORTED +/* Utility used below - a simple accurate power of ten from an integral + * exponent. + */ +static double +png_pow10(int power) +{ + int recip = 0; + double d = 1; + + /* Handle negative exponent with a reciprocal at the end because + * 10 is exact whereas .1 is inexact in base 2 + */ + if (power < 0) + { + if (power < DBL_MIN_10_EXP) return 0; + recip = 1, power = -power; + } + + if (power > 0) + { + /* Decompose power bitwise. */ + double mult = 10; + do + { + if (power & 1) d *= mult; + mult *= mult; + power >>= 1; + } + while (power > 0); + + if (recip) d = 1/d; + } + /* else power is 0 and d is 1 */ + + return d; +} + +/* Function to format a floating point value in ASCII with a given + * precision. + */ +void /* PRIVATE */ +png_ascii_from_fp(png_structp png_ptr, png_charp ascii, png_size_t size, + double fp, unsigned int precision) +{ + /* We use standard functions from math.h, but not printf because + * that would require stdio. The caller must supply a buffer of + * sufficient size or we will png_error. The tests on size and + * the space in ascii[] consumed are indicated below. + */ + if (precision < 1) + precision = DBL_DIG; + + /* Enforce the limit of the implementation precision too. */ + if (precision > DBL_DIG+1) + precision = DBL_DIG+1; + + /* Basic sanity checks */ + if (size >= precision+5) /* See the requirements below. */ + { + if (fp < 0) + { + fp = -fp; + *ascii++ = 45; /* '-' PLUS 1 TOTAL 1*/ + --size; + } + + if (fp >= DBL_MIN && fp <= DBL_MAX) + { + int exp_b10; /* A base 10 exponent */ + double base; /* 10^exp_b10 */ + + /* First extract a base 10 exponent of the number, + * the calculation below rounds down when converting + * from base 2 to base 10 (multiply by log10(2) - + * 0.3010, but 77/256 is 0.3008, so exp_b10 needs to + * be increased. Note that the arithmetic shift + * performs a floor() unlike C arithmetic - using a + * C multiply would break the following for negative + * exponents. + */ + (void)frexp(fp, &exp_b10); /* exponent to base 2 */ + + exp_b10 = (exp_b10 * 77) >> 8; /* <= exponent to base 10 */ + + /* Avoid underflow here. */ + base = png_pow10(exp_b10); /* May underflow */ + + while (base < DBL_MIN || base < fp) + { + /* And this may overflow. */ + double test = png_pow10(exp_b10+1); + + if (test <= DBL_MAX) + ++exp_b10, base = test; + + else + break; + } + + /* Normalize fp and correct exp_b10, after this fp is in the + * range [.1,1) and exp_b10 is both the exponent and the digit + * *before* which the decimal point should be inserted + * (starting with 0 for the first digit). Note that this + * works even if 10^exp_b10 is out of range because of the + * test on DBL_MAX above. + */ + fp /= base; + while (fp >= 1) fp /= 10, ++exp_b10; + + /* Because of the code above fp may, at this point, be + * less than .1, this is ok because the code below can + * handle the leading zeros this generates, so no attempt + * is made to correct that here. + */ + + { + int czero, clead, cdigits; + char exponent[10]; + + /* Allow up to two leading zeros - this will not lengthen + * the number compared to using E-n. + */ + if (exp_b10 < 0 && exp_b10 > -3) /* PLUS 3 TOTAL 4 */ + { + czero = -exp_b10; /* PLUS 2 digits: TOTAL 3 */ + exp_b10 = 0; /* Dot added below before first output. */ + } + else + czero = 0; /* No zeros to add */ + + /* Generate the digit list, stripping trailing zeros and + * inserting a '.' before a digit if the exponent is 0. + */ + clead = czero; /* Count of leading zeros */ + cdigits = 0; /* Count of digits in list. */ + + do + { + double d; + + fp *= 10; + /* Use modf here, not floor and subtract, so that + * the separation is done in one step. At the end + * of the loop don't break the number into parts so + * that the final digit is rounded. + */ + if (cdigits+czero-clead+1 < (int)precision) + fp = modf(fp, &d); + + else + { + d = floor(fp + .5); + + if (d > 9) + { + /* Rounding up to 10, handle that here. */ + if (czero > 0) + { + --czero, d = 1; + if (cdigits == 0) --clead; + } + else + { + while (cdigits > 0 && d > 9) + { + int ch = *--ascii; + + if (exp_b10 != (-1)) + ++exp_b10; + + else if (ch == 46) + { + ch = *--ascii, ++size; + /* Advance exp_b10 to '1', so that the + * decimal point happens after the + * previous digit. + */ + exp_b10 = 1; + } + + --cdigits; + d = ch - 47; /* I.e. 1+(ch-48) */ + } + + /* Did we reach the beginning? If so adjust the + * exponent but take into account the leading + * decimal point. + */ + if (d > 9) /* cdigits == 0 */ + { + if (exp_b10 == (-1)) + { + /* Leading decimal point (plus zeros?), if + * we lose the decimal point here it must + * be reentered below. + */ + int ch = *--ascii; + + if (ch == 46) + ++size, exp_b10 = 1; + + /* Else lost a leading zero, so 'exp_b10' is + * still ok at (-1) + */ + } + else + ++exp_b10; + + /* In all cases we output a '1' */ + d = 1; + } + } + } + fp = 0; /* Guarantees termination below. */ + } + + if (d == 0) + { + ++czero; + if (cdigits == 0) ++clead; + } + else + { + /* Included embedded zeros in the digit count. */ + cdigits += czero - clead; + clead = 0; + + while (czero > 0) + { + /* exp_b10 == (-1) means we just output the decimal + * place - after the DP don't adjust 'exp_b10' any + * more! + */ + if (exp_b10 != (-1)) + { + if (exp_b10 == 0) *ascii++ = 46, --size; + /* PLUS 1: TOTAL 4 */ + --exp_b10; + } + *ascii++ = 48, --czero; + } + + if (exp_b10 != (-1)) + { + if (exp_b10 == 0) *ascii++ = 46, --size; /* counted + above */ + --exp_b10; + } + *ascii++ = (char)(48 + (int)d), ++cdigits; + } + } + while (cdigits+czero-clead < (int)precision && fp > DBL_MIN); + + /* The total output count (max) is now 4+precision */ + + /* Check for an exponent, if we don't need one we are + * done and just need to terminate the string. At + * this point exp_b10==(-1) is effectively if flag - it got + * to '-1' because of the decrement after outputing + * the decimal point above (the exponent required is + * *not* -1!) + */ + if (exp_b10 >= (-1) && exp_b10 <= 2) + { + /* The following only happens if we didn't output the + * leading zeros above for negative exponent, so this + * doest add to the digit requirement. Note that the + * two zeros here can only be output if the two leading + * zeros were *not* output, so this doesn't increase + * the output count. + */ + while (--exp_b10 >= 0) *ascii++ = 48; + + *ascii = 0; + + /* Total buffer requirement (including the '\0') is + * 5+precision - see check at the start. + */ + return; + } + + /* Here if an exponent is required, adjust size for + * the digits we output but did not count. The total + * digit output here so far is at most 1+precision - no + * decimal point and no leading or trailing zeros have + * been output. + */ + size -= cdigits; + + *ascii++ = 69, --size; /* 'E': PLUS 1 TOTAL 2+precision*/ + if (exp_b10 < 0) + { + *ascii++ = 45, --size; /* '-': PLUS 1 TOTAL 3+precision */ + exp_b10 = -exp_b10; + } + + cdigits = 0; + + while (exp_b10 > 0) + { + exponent[cdigits++] = (char)(48 + exp_b10 % 10); + exp_b10 /= 10; + } + + /* Need another size check here for the exponent digits, so + * this need not be considered above. + */ + if ((int)size > cdigits) + { + while (cdigits > 0) *ascii++ = exponent[--cdigits]; + + *ascii = 0; + + return; + } + } + } + else if (!(fp >= DBL_MIN)) + { + *ascii++ = 48; /* '0' */ + *ascii = 0; + return; + } + else + { + *ascii++ = 105; /* 'i' */ + *ascii++ = 110; /* 'n' */ + *ascii++ = 102; /* 'f' */ + *ascii = 0; + return; + } + } + + /* Here on buffer too small. */ + png_error(png_ptr, "ASCII conversion buffer too small"); +} + +# endif /* FLOATING_POINT */ + +# ifdef PNG_FIXED_POINT_SUPPORTED +/* Function to format a fixed point value in ASCII. + */ +void /* PRIVATE */ +png_ascii_from_fixed(png_structp png_ptr, png_charp ascii, png_size_t size, + png_fixed_point fp) +{ + /* Require space for 10 decimal digits, a decimal point, a minus sign and a + * trailing \0, 13 characters: + */ + if (size > 12) + { + png_uint_32 num; + + /* Avoid overflow here on the minimum integer. */ + if (fp < 0) + *ascii++ = 45, --size, num = -fp; + else + num = fp; + + if (num <= 0x80000000U) /* else overflowed */ + { + unsigned int ndigits = 0, first = 16/*flag value*/; + char digits[10]; + + while (num) + { + /* Split the low digit off num: */ + unsigned int tmp = num/10; + num -= tmp*10; + digits[ndigits++] = (char)(48 + num); + /* Record the first non-zero digit, note that this is a number + * starting at 1, it's not actually the array index. + */ + if (first == 16 && num > 0) + first = ndigits; + num = tmp; + } + + if (ndigits > 0) + { + while (ndigits > 5) *ascii++ = digits[--ndigits]; + /* The remaining digits are fractional digits, ndigits is '5' or + * smaller at this point. It is certainly not zero. Check for a + * non-zero fractional digit: + */ + if (first <= 5) + { + unsigned int i; + *ascii++ = 46; /* decimal point */ + /* ndigits may be <5 for small numbers, output leading zeros + * then ndigits digits to first: + */ + i = 5; + while (ndigits < i) *ascii++ = 48, --i; + while (ndigits >= first) *ascii++ = digits[--ndigits]; + /* Don't output the trailing zeros! */ + } + } + else + *ascii++ = 48; + + /* And null terminate the string: */ + *ascii = 0; + return; + } + } + + /* Here on buffer too small. */ + png_error(png_ptr, "ASCII conversion buffer too small"); +} +# endif /* FIXED_POINT */ +#endif /* READ_SCAL */ + +#if defined(PNG_FLOATING_POINT_SUPPORTED) && \ + !defined(PNG_FIXED_POINT_MACRO_SUPPORTED) +png_fixed_point +png_fixed(png_structp png_ptr, double fp, png_const_charp text) +{ + double r = floor(100000 * fp + .5); + + if (r > 2147483647. || r < -2147483648.) + png_fixed_error(png_ptr, text); + + return (png_fixed_point)r; +} +#endif + +#if defined(PNG_READ_GAMMA_SUPPORTED) || \ + defined(PNG_INCH_CONVERSIONS_SUPPORTED) || defined(PNG__READ_pHYs_SUPPORTED) +/* muldiv functions */ +/* This API takes signed arguments and rounds the result to the nearest + * integer (or, for a fixed point number - the standard argument - to + * the nearest .00001). Overflow and divide by zero are signalled in + * the result, a boolean - true on success, false on overflow. + */ +int +png_muldiv(png_fixed_point_p res, png_fixed_point a, png_int_32 times, + png_int_32 divisor) +{ + /* Return a * times / divisor, rounded. */ + if (divisor != 0) + { + if (a == 0 || times == 0) + { + *res = 0; + return 1; + } + else + { +#ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED + double r = a; + r *= times; + r /= divisor; + r = floor(r+.5); + + /* A png_fixed_point is a 32 bit integer. */ + if (r <= 2147483647. && r >= -2147483648.) + { + *res = (png_fixed_point)r; + return 1; + } +#else + int negative = 0; + png_uint_32 A, T, D; + png_uint_32 s16, s32, s00; + + if (a < 0) + negative = 1, A = -a; + else + A = a; + + if (times < 0) + negative = !negative, T = -times; + else + T = times; + + if (divisor < 0) + negative = !negative, D = -divisor; + else + D = divisor; + + /* Following can't overflow because the arguments only + * have 31 bits each, however the result may be 32 bits. + */ + s16 = (A >> 16) * (T & 0xffff) + + (A & 0xffff) * (T >> 16); + /* Can't overflow because the a*times bit is only 30 + * bits at most. + */ + s32 = (A >> 16) * (T >> 16) + (s16 >> 16); + s00 = (A & 0xffff) * (T & 0xffff); + + s16 = (s16 & 0xffff) << 16; + s00 += s16; + + if (s00 < s16) + ++s32; /* carry */ + + if (s32 < D) /* else overflow */ + { + /* s32.s00 is now the 64 bit product, do a standard + * division, we know that s32 < D, so the maximum + * required shift is 31. + */ + int bitshift = 32; + png_fixed_point result = 0; /* NOTE: signed */ + + while (--bitshift >= 0) + { + png_uint_32 d32, d00; + + if (bitshift > 0) + d32 = D >> (32-bitshift), d00 = D << bitshift; + + else + d32 = 0, d00 = D; + + if (s32 > d32) + { + if (s00 < d00) --s32; /* carry */ + s32 -= d32, s00 -= d00, result += 1<= d00) + s32 = 0, s00 -= d00, result += 1<= (D >> 1)) + ++result; + + if (negative) + result = -result; + + /* Check for overflow. */ + if ((negative && result <= 0) || (!negative && result >= 0)) + { + *res = result; + return 1; + } + } +#endif + } + } + + return 0; +} +#endif /* READ_GAMMA || INCH_CONVERSIONS */ + +#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_INCH_CONVERSIONS_SUPPORTED) +/* The following is for when the caller doesn't much care about the + * result. + */ +png_fixed_point +png_muldiv_warn(png_structp png_ptr, png_fixed_point a, png_int_32 times, + png_int_32 divisor) +{ + png_fixed_point result; + + if (png_muldiv(&result, a, times, divisor)) + return result; + + png_warning(png_ptr, "fixed point overflow ignored"); + return 0; +} +#endif + +#ifdef PNG_READ_GAMMA_SUPPORTED /* more fixed point functions for gammma */ +/* Calculate a reciprocal, return 0 on div-by-zero or overflow. */ +png_fixed_point +png_reciprocal(png_fixed_point a) +{ +#ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED + double r = floor(1E10/a+.5); + + if (r <= 2147483647. && r >= -2147483648.) + return (png_fixed_point)r; +#else + png_fixed_point res; + + if (png_muldiv(&res, 100000, 100000, a)) + return res; +#endif + + return 0; /* error/overflow */ +} + +/* A local convenience routine. */ +static png_fixed_point +png_product2(png_fixed_point a, png_fixed_point b) +{ + /* The required result is 1/a * 1/b; the following preserves accuracy. */ +#ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED + double r = a * 1E-5; + r *= b; + r = floor(r+.5); + + if (r <= 2147483647. && r >= -2147483648.) + return (png_fixed_point)r; +#else + png_fixed_point res; + + if (png_muldiv(&res, a, b, 100000)) + return res; +#endif + + return 0; /* overflow */ +} + +/* The inverse of the above. */ +png_fixed_point +png_reciprocal2(png_fixed_point a, png_fixed_point b) +{ + /* The required result is 1/a * 1/b; the following preserves accuracy. */ +#ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED + double r = 1E15/a; + r /= b; + r = floor(r+.5); + + if (r <= 2147483647. && r >= -2147483648.) + return (png_fixed_point)r; +#else + /* This may overflow because the range of png_fixed_point isn't symmetric, + * but this API is only used for the product of file and screen gamma so it + * doesn't matter that the smallest number it can produce is 1/21474, not + * 1/100000 + */ + png_fixed_point res = png_product2(a, b); + + if (res != 0) + return png_reciprocal(res); +#endif + + return 0; /* overflow */ +} +#endif /* READ_GAMMA */ + +#ifdef PNG_CHECK_cHRM_SUPPORTED +/* Added at libpng version 1.2.34 (Dec 8, 2008) and 1.4.0 (Jan 2, + * 2010: moved from pngset.c) */ +/* + * Multiply two 32-bit numbers, V1 and V2, using 32-bit + * arithmetic, to produce a 64 bit result in the HI/LO words. + * + * A B + * x C D + * ------ + * AD || BD + * AC || CB || 0 + * + * where A and B are the high and low 16-bit words of V1, + * C and D are the 16-bit words of V2, AD is the product of + * A and D, and X || Y is (X << 16) + Y. +*/ + +void /* PRIVATE */ +png_64bit_product (long v1, long v2, unsigned long *hi_product, + unsigned long *lo_product) +{ + int a, b, c, d; + long lo, hi, x, y; + + a = (v1 >> 16) & 0xffff; + b = v1 & 0xffff; + c = (v2 >> 16) & 0xffff; + d = v2 & 0xffff; + + lo = b * d; /* BD */ + x = a * d + c * b; /* AD + CB */ + y = ((lo >> 16) & 0xffff) + x; + + lo = (lo & 0xffff) | ((y & 0xffff) << 16); + hi = (y >> 16) & 0xffff; + + hi += a * c; /* AC */ + + *hi_product = (unsigned long)hi; + *lo_product = (unsigned long)lo; +} +#endif /* CHECK_cHRM */ + +#ifdef PNG_READ_GAMMA_SUPPORTED /* gamma table code */ +#ifndef PNG_FLOATING_ARITHMETIC_SUPPORTED +/* Fixed point gamma. + * + * To calculate gamma this code implements fast log() and exp() calls using only + * fixed point arithmetic. This code has sufficient precision for either 8 or + * 16 bit sample values. + * + * The tables used here were calculated using simple 'bc' programs, but C double + * precision floating point arithmetic would work fine. The programs are given + * at the head of each table. + * + * 8 bit log table + * This is a table of -log(value/255)/log(2) for 'value' in the range 128 to + * 255, so it's the base 2 logarithm of a normalized 8 bit floating point + * mantissa. The numbers are 32 bit fractions. + */ +static png_uint_32 +png_8bit_l2[128] = +{ +# if PNG_DO_BC + for (i=128;i<256;++i) { .5 - l(i/255)/l(2)*65536*65536; } +# endif + 4270715492U, 4222494797U, 4174646467U, 4127164793U, 4080044201U, 4033279239U, + 3986864580U, 3940795015U, 3895065449U, 3849670902U, 3804606499U, 3759867474U, + 3715449162U, 3671346997U, 3627556511U, 3584073329U, 3540893168U, 3498011834U, + 3455425220U, 3413129301U, 3371120137U, 3329393864U, 3287946700U, 3246774933U, + 3205874930U, 3165243125U, 3124876025U, 3084770202U, 3044922296U, 3005329011U, + 2965987113U, 2926893432U, 2888044853U, 2849438323U, 2811070844U, 2772939474U, + 2735041326U, 2697373562U, 2659933400U, 2622718104U, 2585724991U, 2548951424U, + 2512394810U, 2476052606U, 2439922311U, 2404001468U, 2368287663U, 2332778523U, + 2297471715U, 2262364947U, 2227455964U, 2192742551U, 2158222529U, 2123893754U, + 2089754119U, 2055801552U, 2022034013U, 1988449497U, 1955046031U, 1921821672U, + 1888774511U, 1855902668U, 1823204291U, 1790677560U, 1758320682U, 1726131893U, + 1694109454U, 1662251657U, 1630556815U, 1599023271U, 1567649391U, 1536433567U, + 1505374214U, 1474469770U, 1443718700U, 1413119487U, 1382670639U, 1352370686U, + 1322218179U, 1292211689U, 1262349810U, 1232631153U, 1203054352U, 1173618059U, + 1144320946U, 1115161701U, 1086139034U, 1057251672U, 1028498358U, 999877854U, + 971388940U, 943030410U, 914801076U, 886699767U, 858725327U, 830876614U, + 803152505U, 775551890U, 748073672U, 720716771U, 693480120U, 666362667U, + 639363374U, 612481215U, 585715177U, 559064263U, 532527486U, 506103872U, + 479792461U, 453592303U, 427502463U, 401522014U, 375650043U, 349885648U, + 324227938U, 298676034U, 273229066U, 247886176U, 222646516U, 197509248U, + 172473545U, 147538590U, 122703574U, 97967701U, 73330182U, 48790236U, + 24347096U, 0U +#if 0 + /* The following are the values for 16 bit tables - these work fine for the 8 + * bit conversions but produce very slightly larger errors in the 16 bit log + * (about 1.2 as opposed to 0.7 absolute error in the final value). To use + * these all the shifts below must be adjusted appropriately. + */ + 65166, 64430, 63700, 62976, 62257, 61543, 60835, 60132, 59434, 58741, 58054, + 57371, 56693, 56020, 55352, 54689, 54030, 53375, 52726, 52080, 51439, 50803, + 50170, 49542, 48918, 48298, 47682, 47070, 46462, 45858, 45257, 44661, 44068, + 43479, 42894, 42312, 41733, 41159, 40587, 40020, 39455, 38894, 38336, 37782, + 37230, 36682, 36137, 35595, 35057, 34521, 33988, 33459, 32932, 32408, 31887, + 31369, 30854, 30341, 29832, 29325, 28820, 28319, 27820, 27324, 26830, 26339, + 25850, 25364, 24880, 24399, 23920, 23444, 22970, 22499, 22029, 21562, 21098, + 20636, 20175, 19718, 19262, 18808, 18357, 17908, 17461, 17016, 16573, 16132, + 15694, 15257, 14822, 14390, 13959, 13530, 13103, 12678, 12255, 11834, 11415, + 10997, 10582, 10168, 9756, 9346, 8937, 8531, 8126, 7723, 7321, 6921, 6523, + 6127, 5732, 5339, 4947, 4557, 4169, 3782, 3397, 3014, 2632, 2251, 1872, 1495, + 1119, 744, 372 +#endif +}; + +static png_int_32 +png_log8bit(unsigned int x) +{ + unsigned int lg2 = 0; + /* Each time 'x' is multiplied by 2, 1 must be subtracted off the final log, + * because the log is actually negate that means adding 1. The final + * returned value thus has the range 0 (for 255 input) to 7.994 (for 1 + * input), return 7.99998 for the overflow (log 0) case - so the result is + * always at most 19 bits. + */ + if ((x &= 0xff) == 0) + return 0xffffffff; + + if ((x & 0xf0) == 0) + lg2 = 4, x <<= 4; + + if ((x & 0xc0) == 0) + lg2 += 2, x <<= 2; + + if ((x & 0x80) == 0) + lg2 += 1, x <<= 1; + + /* result is at most 19 bits, so this cast is safe: */ + return (png_int_32)((lg2 << 16) + ((png_8bit_l2[x-128]+32768)>>16)); +} + +/* The above gives exact (to 16 binary places) log2 values for 8 bit images, + * for 16 bit images we use the most significant 8 bits of the 16 bit value to + * get an approximation then multiply the approximation by a correction factor + * determined by the remaining up to 8 bits. This requires an additional step + * in the 16 bit case. + * + * We want log2(value/65535), we have log2(v'/255), where: + * + * value = v' * 256 + v'' + * = v' * f + * + * So f is value/v', which is equal to (256+v''/v') since v' is in the range 128 + * to 255 and v'' is in the range 0 to 255 f will be in the range 256 to less + * than 258. The final factor also needs to correct for the fact that our 8 bit + * value is scaled by 255, whereas the 16 bit values must be scaled by 65535. + * + * This gives a final formula using a calculated value 'x' which is value/v' and + * scaling by 65536 to match the above table: + * + * log2(x/257) * 65536 + * + * Since these numbers are so close to '1' we can use simple linear + * interpolation between the two end values 256/257 (result -368.61) and 258/257 + * (result 367.179). The values used below are scaled by a further 64 to give + * 16 bit precision in the interpolation: + * + * Start (256): -23591 + * Zero (257): 0 + * End (258): 23499 + */ +static png_int_32 +png_log16bit(png_uint_32 x) +{ + unsigned int lg2 = 0; + + /* As above, but now the input has 16 bits. */ + if ((x &= 0xffff) == 0) + return 0xffffffff; + + if ((x & 0xff00) == 0) + lg2 = 8, x <<= 8; + + if ((x & 0xf000) == 0) + lg2 += 4, x <<= 4; + + if ((x & 0xc000) == 0) + lg2 += 2, x <<= 2; + + if ((x & 0x8000) == 0) + lg2 += 1, x <<= 1; + + /* Calculate the base logarithm from the top 8 bits as a 28 bit fractional + * value. + */ + lg2 <<= 28; + lg2 += (png_8bit_l2[(x>>8)-128]+8) >> 4; + + /* Now we need to interpolate the factor, this requires a division by the top + * 8 bits. Do this with maximum precision. + */ + x = ((x << 16) + (x >> 9)) / (x >> 8); + + /* Since we divided by the top 8 bits of 'x' there will be a '1' at 1<<24, + * the value at 1<<16 (ignoring this) will be 0 or 1; this gives us exactly + * 16 bits to interpolate to get the low bits of the result. Round the + * answer. Note that the end point values are scaled by 64 to retain overall + * precision and that 'lg2' is current scaled by an extra 12 bits, so adjust + * the overall scaling by 6-12. Round at every step. + */ + x -= 1U << 24; + + if (x <= 65536U) /* <= '257' */ + lg2 += ((23591U * (65536U-x)) + (1U << (16+6-12-1))) >> (16+6-12); + + else + lg2 -= ((23499U * (x-65536U)) + (1U << (16+6-12-1))) >> (16+6-12); + + /* Safe, because the result can't have more than 20 bits: */ + return (png_int_32)((lg2 + 2048) >> 12); +} + +/* The 'exp()' case must invert the above, taking a 20 bit fixed point + * logarithmic value and returning a 16 or 8 bit number as appropriate. In + * each case only the low 16 bits are relevant - the fraction - since the + * integer bits (the top 4) simply determine a shift. + * + * The worst case is the 16 bit distinction between 65535 and 65534, this + * requires perhaps spurious accuracty in the decoding of the logarithm to + * distinguish log2(65535/65534.5) - 10^-5 or 17 bits. There is little chance + * of getting this accuracy in practice. + * + * To deal with this the following exp() function works out the exponent of the + * frational part of the logarithm by using an accurate 32 bit value from the + * top four fractional bits then multiplying in the remaining bits. + */ +static png_uint_32 +png_32bit_exp[16] = +{ +# if PNG_DO_BC + for (i=0;i<16;++i) { .5 + e(-i/16*l(2))*2^32; } +# endif + /* NOTE: the first entry is deliberately set to the maximum 32 bit value. */ + 4294967295U, 4112874773U, 3938502376U, 3771522796U, 3611622603U, 3458501653U, + 3311872529U, 3171459999U, 3037000500U, 2908241642U, 2784941738U, 2666869345U, + 2553802834U, 2445529972U, 2341847524U, 2242560872U +}; + +/* Adjustment table; provided to explain the numbers in the code below. */ +#if PNG_DO_BC +for (i=11;i>=0;--i){ print i, " ", (1 - e(-(2^i)/65536*l(2))) * 2^(32-i), "\n"} + 11 44937.64284865548751208448 + 10 45180.98734845585101160448 + 9 45303.31936980687359311872 + 8 45364.65110595323018870784 + 7 45395.35850361789624614912 + 6 45410.72259715102037508096 + 5 45418.40724413220722311168 + 4 45422.25021786898173001728 + 3 45424.17186732298419044352 + 2 45425.13273269940811464704 + 1 45425.61317555035558641664 + 0 45425.85339951654943850496 +#endif + +static png_uint_32 +png_exp(png_fixed_point x) +{ + if (x > 0 && x <= 0xfffff) /* Else overflow or zero (underflow) */ + { + /* Obtain a 4 bit approximation */ + png_uint_32 e = png_32bit_exp[(x >> 12) & 0xf]; + + /* Incorporate the low 12 bits - these decrease the returned value by + * multiplying by a number less than 1 if the bit is set. The multiplier + * is determined by the above table and the shift. Notice that the values + * converge on 45426 and this is used to allow linear interpolation of the + * low bits. + */ + if (x & 0x800) + e -= (((e >> 16) * 44938U) + 16U) >> 5; + + if (x & 0x400) + e -= (((e >> 16) * 45181U) + 32U) >> 6; + + if (x & 0x200) + e -= (((e >> 16) * 45303U) + 64U) >> 7; + + if (x & 0x100) + e -= (((e >> 16) * 45365U) + 128U) >> 8; + + if (x & 0x080) + e -= (((e >> 16) * 45395U) + 256U) >> 9; + + if (x & 0x040) + e -= (((e >> 16) * 45410U) + 512U) >> 10; + + /* And handle the low 6 bits in a single block. */ + e -= (((e >> 16) * 355U * (x & 0x3fU)) + 256U) >> 9; + + /* Handle the upper bits of x. */ + e >>= x >> 16; + return e; + } + + /* Check for overflow */ + if (x <= 0) + return png_32bit_exp[0]; + + /* Else underflow */ + return 0; +} + +static png_byte +png_exp8bit(png_fixed_point lg2) +{ + /* Get a 32 bit value: */ + png_uint_32 x = png_exp(lg2); + + /* Convert the 32 bit value to 0..255 by multiplying by 256-1, note that the + * second, rounding, step can't overflow because of the first, subtraction, + * step. + */ + x -= x >> 8; + return (png_byte)((x + 0x7fffffU) >> 24); +} + +static png_uint_16 +png_exp16bit(png_fixed_point lg2) +{ + /* Get a 32 bit value: */ + png_uint_32 x = png_exp(lg2); + + /* Convert the 32 bit value to 0..65535 by multiplying by 65536-1: */ + x -= x >> 16; + return (png_uint_16)((x + 32767U) >> 16); +} +#endif /* FLOATING_ARITHMETIC */ + +png_byte +png_gamma_8bit_correct(unsigned int value, png_fixed_point gamma_val) +{ + if (value > 0 && value < 255) + { +# ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED + double r = floor(255*pow(value/255.,gamma_val*.00001)+.5); + return (png_byte)r; +# else + png_int_32 lg2 = png_log8bit(value); + png_fixed_point res; + + if (png_muldiv(&res, gamma_val, lg2, PNG_FP_1)) + return png_exp8bit(res); + + /* Overflow. */ + value = 0; +# endif + } + + return (png_byte)value; +} + +png_uint_16 +png_gamma_16bit_correct(unsigned int value, png_fixed_point gamma_val) +{ + if (value > 0 && value < 65535) + { +# ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED + double r = floor(65535*pow(value/65535.,gamma_val*.00001)+.5); + return (png_uint_16)r; +# else + png_int_32 lg2 = png_log16bit(value); + png_fixed_point res; + + if (png_muldiv(&res, gamma_val, lg2, PNG_FP_1)) + return png_exp16bit(res); + + /* Overflow. */ + value = 0; +# endif + } + + return (png_uint_16)value; +} + +/* This does the right thing based on the bit_depth field of the + * png_struct, interpreting values as 8 or 16 bit. While the result + * is nominally a 16 bit value if bit depth is 8 then the result is + * 8 bit (as are the arguments.) + */ +png_uint_16 /* PRIVATE */ +png_gamma_correct(png_structp png_ptr, unsigned int value, + png_fixed_point gamma_val) +{ + if (png_ptr->bit_depth == 8) + return png_gamma_8bit_correct(value, gamma_val); + + else + return png_gamma_16bit_correct(value, gamma_val); +} + +/* This is the shared test on whether a gamma value is 'significant' - whether + * it is worth doing gamma correction. + */ +int /* PRIVATE */ +png_gamma_significant(png_fixed_point gamma_val) +{ + return gamma_val < PNG_FP_1 - PNG_GAMMA_THRESHOLD_FIXED || + gamma_val > PNG_FP_1 + PNG_GAMMA_THRESHOLD_FIXED; +} + +/* Internal function to build a single 16 bit table - the table consists of + * 'num' 256 entry subtables, where 'num' is determined by 'shift' - the amount + * to shift the input values right (or 16-number_of_signifiant_bits). + * + * The caller is responsible for ensuring that the table gets cleaned up on + * png_error (i.e. if one of the mallocs below fails) - i.e. the *table argument + * should be somewhere that will be cleaned. + */ +static void +png_build_16bit_table(png_structp png_ptr, png_uint_16pp *ptable, + PNG_CONST unsigned int shift, PNG_CONST png_fixed_point gamma_val) +{ + /* Various values derived from 'shift': */ + PNG_CONST unsigned int num = 1U << (8U - shift); + PNG_CONST unsigned int max = (1U << (16U - shift))-1U; + PNG_CONST unsigned int max_by_2 = 1U << (15U-shift); + unsigned int i; + + png_uint_16pp table = *ptable = + (png_uint_16pp)png_calloc(png_ptr, num * png_sizeof(png_uint_16p)); + + for (i = 0; i < num; i++) + { + png_uint_16p sub_table = table[i] = + (png_uint_16p)png_malloc(png_ptr, 256 * png_sizeof(png_uint_16)); + + /* The 'threshold' test is repeated here because it can arise for one of + * the 16 bit tables even if the others don't hit it. + */ + if (png_gamma_significant(gamma_val)) + { + /* The old code would overflow at the end and this would cause the + * 'pow' function to return a result >1, resulting in an + * arithmetic error. This code follows the spec exactly; ig is + * the recovered input sample, it always has 8-16 bits. + * + * We want input * 65535/max, rounded, the arithmetic fits in 32 + * bits (unsigned) so long as max <= 32767. + */ + unsigned int j; + for (j = 0; j < 256; j++) + { + png_uint_32 ig = (j << (8-shift)) + i; +# ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED + /* Inline the 'max' scaling operation: */ + double d = floor(65535*pow(ig/(double)max, gamma_val*.00001)+.5); + sub_table[j] = (png_uint_16)d; +# else + if (shift) + ig = (ig * 65535U + max_by_2)/max; + + sub_table[j] = png_gamma_16bit_correct(ig, gamma_val); +# endif + } + } + else + { + /* We must still build a table, but do it the fast way. */ + unsigned int j; + + for (j = 0; j < 256; j++) + { + png_uint_32 ig = (j << (8-shift)) + i; + + if (shift) + ig = (ig * 65535U + max_by_2)/max; + + sub_table[j] = (png_uint_16)ig; + } + } + } +} + +/* NOTE: this function expects the *inverse* of the overall gamma transformation + * required. + */ +static void +png_build_16to8_table(png_structp png_ptr, png_uint_16pp *ptable, + PNG_CONST unsigned int shift, PNG_CONST png_fixed_point gamma_val) +{ + PNG_CONST unsigned int num = 1U << (8U - shift); + PNG_CONST unsigned int max = (1U << (16U - shift))-1U; + unsigned int i; + png_uint_32 last; + + png_uint_16pp table = *ptable = + (png_uint_16pp)png_calloc(png_ptr, num * png_sizeof(png_uint_16p)); + + /* 'num' is the number of tables and also the number of low bits of low + * bits of the input 16 bit value used to select a table. Each table is + * itself index by the high 8 bits of the value. + */ + for (i = 0; i < num; i++) + table[i] = (png_uint_16p)png_malloc(png_ptr, + 256 * png_sizeof(png_uint_16)); + + /* 'gamma_val' is set to the reciprocal of the value calculated above, so + * pow(out,g) is an *input* value. 'last' is the last input value set. + * + * In the loop 'i' is used to find output values. Since the output is 8 + * bit there are only 256 possible values. The tables are set up to + * select the closest possible output value for each input by finding + * the input value at the boundary between each pair of output values + * and filling the table up to that boundary with the lower output + * value. + * + * The boundary values are 0.5,1.5..253.5,254.5. Since these are 9 bit + * values the code below uses a 16 bit value in i; the values start at + * 128.5 (for 0.5) and step by 257, for a total of 254 values (the last + * entries are filled with 255). Start i at 128 and fill all 'last' + * table entries <= 'max' + */ + last = 0; + for (i = 0; i < 255; ++i) /* 8 bit output value */ + { + /* Find the corresponding maximum input value */ + png_uint_16 out = (png_uint_16)(i * 257U); /* 16 bit output value */ + + /* Find the boundary value in 16 bits: */ + png_uint_32 bound = png_gamma_16bit_correct(out+128U, gamma_val); + + /* Adjust (round) to (16-shift) bits: */ + bound = (bound * max + 32768U)/65535U + 1U; + + while (last < bound) + { + table[last & (0xffU >> shift)][last >> (8U - shift)] = out; + last++; + } + } + + /* And fill in the final entries. */ + while (last < (num << 8)) + { + table[last & (0xff >> shift)][last >> (8U - shift)] = 65535U; + last++; + } +} + +/* Build a single 8 bit table: same as the 16 bit case but much simpler (and + * typically much faster). Note that libpng currently does no sBIT processing + * (apparently contrary to the spec) so a 256 entry table is always generated. + */ +static void +png_build_8bit_table(png_structp png_ptr, png_bytepp ptable, + PNG_CONST png_fixed_point gamma_val) +{ + unsigned int i; + png_bytep table = *ptable = (png_bytep)png_malloc(png_ptr, 256); + + if (png_gamma_significant(gamma_val)) for (i=0; i<256; i++) + table[i] = png_gamma_8bit_correct(i, gamma_val); + + else for (i=0; i<256; ++i) + table[i] = (png_byte)i; +} + +/* We build the 8- or 16-bit gamma tables here. Note that for 16-bit + * tables, we don't make a full table if we are reducing to 8-bit in + * the future. Note also how the gamma_16 tables are segmented so that + * we don't need to allocate > 64K chunks for a full 16-bit table. + */ +void /* PRIVATE */ +png_build_gamma_table(png_structp png_ptr, int bit_depth) +{ + png_debug(1, "in png_build_gamma_table"); + + if (bit_depth <= 8) + { + png_build_8bit_table(png_ptr, &png_ptr->gamma_table, + png_ptr->screen_gamma > 0 ? png_reciprocal2(png_ptr->gamma, + png_ptr->screen_gamma) : PNG_FP_1); + +#if defined(PNG_READ_BACKGROUND_SUPPORTED) || \ + defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) + if (png_ptr->transformations & ((PNG_BACKGROUND) | PNG_RGB_TO_GRAY)) + { + png_build_8bit_table(png_ptr, &png_ptr->gamma_to_1, + png_reciprocal(png_ptr->gamma)); + + png_build_8bit_table(png_ptr, &png_ptr->gamma_from_1, + png_ptr->screen_gamma > 0 ? png_reciprocal(png_ptr->screen_gamma) : + png_ptr->gamma/* Probably doing rgb_to_gray */); + } +#endif /* PNG_READ_BACKGROUND_SUPPORTED || PNG_RGB_TO_GRAY_SUPPORTED */ + } + else + { + png_byte shift, sig_bit; + + if (png_ptr->color_type & PNG_COLOR_MASK_COLOR) + { + sig_bit = png_ptr->sig_bit.red; + + if (png_ptr->sig_bit.green > sig_bit) + sig_bit = png_ptr->sig_bit.green; + + if (png_ptr->sig_bit.blue > sig_bit) + sig_bit = png_ptr->sig_bit.blue; + } + else + sig_bit = png_ptr->sig_bit.gray; + + /* 16 bit gamma code uses this equation: + * + * ov = table[(iv & 0xff) >> gamma_shift][iv >> 8] + * + * Where 'iv' is the input color value and 'ov' is the output value - + * pow(iv, gamma). + * + * Thus the gamma table consists of up to 256 256 entry tables. The table + * is selected by the (8-gamma_shift) most significant of the low 8 bits of + * the color value then indexed by the upper 8 bits: + * + * table[low bits][high 8 bits] + * + * So the table 'n' corresponds to all those 'iv' of: + * + * ..<(n+1 << gamma_shift)-1> + * + */ + if (sig_bit > 0 && sig_bit < 16U) + shift = (png_byte)(16U - sig_bit); /* shift == insignificant bits */ + + else + shift = 0; /* keep all 16 bits */ + + if (png_ptr->transformations & PNG_16_TO_8) + { + /* PNG_MAX_GAMMA_8 is the number of bits to keep - effectively + * the significant bits in the *input* when the output will + * eventually be 8 bits. By default it is 11. + */ + if (shift < (16U - PNG_MAX_GAMMA_8)) + shift = (16U - PNG_MAX_GAMMA_8); + } + + if (shift > 8U) + shift = 8U; /* Guarantees at least one table! */ + + png_ptr->gamma_shift = shift; + +#ifdef PNG_16BIT_SUPPORTED + if (png_ptr->transformations & (PNG_16_TO_8 | PNG_BACKGROUND)) +#endif + png_build_16to8_table(png_ptr, &png_ptr->gamma_16_table, shift, + png_ptr->screen_gamma > 0 ? png_product2(png_ptr->gamma, + png_ptr->screen_gamma) : PNG_FP_1); + +#ifdef PNG_16BIT_SUPPORTED + else + png_build_16bit_table(png_ptr, &png_ptr->gamma_16_table, shift, + png_ptr->screen_gamma > 0 ? png_reciprocal2(png_ptr->gamma, + png_ptr->screen_gamma) : PNG_FP_1); +#endif + +#if defined(PNG_READ_BACKGROUND_SUPPORTED) || \ + defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) + if (png_ptr->transformations & (PNG_BACKGROUND | PNG_RGB_TO_GRAY)) + { + png_build_16bit_table(png_ptr, &png_ptr->gamma_16_to_1, shift, + png_reciprocal(png_ptr->gamma)); + + /* Notice that the '16 from 1' table should be full precision, however + * the lookup on this table still uses gamma_shift, so it can't be. + * TODO: fix this. + */ + png_build_16bit_table(png_ptr, &png_ptr->gamma_16_from_1, shift, + png_ptr->screen_gamma > 0 ? png_reciprocal(png_ptr->screen_gamma) : + png_ptr->gamma/* Probably doing rgb_to_gray */); + } +#endif /* PNG_READ_BACKGROUND_SUPPORTED || PNG_RGB_TO_GRAY_SUPPORTED */ + } +} +#endif /* READ_GAMMA */ +#endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */ diff --git a/programs/develop/libraries/libpng/png.h b/programs/develop/libraries/libpng/png.h new file mode 100644 index 0000000000..100f56dba2 --- /dev/null +++ b/programs/develop/libraries/libpng/png.h @@ -0,0 +1,2280 @@ + +/* png.h - header file for PNG reference library + * + * libpng version 1.5.1 - February 3, 2011 + * Copyright (c) 1998-2011 Glenn Randers-Pehrson + * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) + * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) + * + * This code is released under the libpng license (See LICENSE, below) + * + * Authors and maintainers: + * libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat + * libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger + * libpng versions 0.97, January 1998, through 1.5.1 - February 3, 2011: Glenn + * See also "Contributing Authors", below. + * + * Note about libpng version numbers: + * + * Due to various miscommunications, unforeseen code incompatibilities + * and occasional factors outside the authors' control, version numbering + * on the library has not always been consistent and straightforward. + * The following table summarizes matters since version 0.89c, which was + * the first widely used release: + * + * source png.h png.h shared-lib + * version string int version + * ------- ------ ----- ---------- + * 0.89c "1.0 beta 3" 0.89 89 1.0.89 + * 0.90 "1.0 beta 4" 0.90 90 0.90 [should have been 2.0.90] + * 0.95 "1.0 beta 5" 0.95 95 0.95 [should have been 2.0.95] + * 0.96 "1.0 beta 6" 0.96 96 0.96 [should have been 2.0.96] + * 0.97b "1.00.97 beta 7" 1.00.97 97 1.0.1 [should have been 2.0.97] + * 0.97c 0.97 97 2.0.97 + * 0.98 0.98 98 2.0.98 + * 0.99 0.99 98 2.0.99 + * 0.99a-m 0.99 99 2.0.99 + * 1.00 1.00 100 2.1.0 [100 should be 10000] + * 1.0.0 (from here on, the 100 2.1.0 [100 should be 10000] + * 1.0.1 png.h string is 10001 2.1.0 + * 1.0.1a-e identical to the 10002 from here on, the shared library + * 1.0.2 source version) 10002 is 2.V where V is the source code + * 1.0.2a-b 10003 version, except as noted. + * 1.0.3 10003 + * 1.0.3a-d 10004 + * 1.0.4 10004 + * 1.0.4a-f 10005 + * 1.0.5 (+ 2 patches) 10005 + * 1.0.5a-d 10006 + * 1.0.5e-r 10100 (not source compatible) + * 1.0.5s-v 10006 (not binary compatible) + * 1.0.6 (+ 3 patches) 10006 (still binary incompatible) + * 1.0.6d-f 10007 (still binary incompatible) + * 1.0.6g 10007 + * 1.0.6h 10007 10.6h (testing xy.z so-numbering) + * 1.0.6i 10007 10.6i + * 1.0.6j 10007 2.1.0.6j (incompatible with 1.0.0) + * 1.0.7beta11-14 DLLNUM 10007 2.1.0.7beta11-14 (binary compatible) + * 1.0.7beta15-18 1 10007 2.1.0.7beta15-18 (binary compatible) + * 1.0.7rc1-2 1 10007 2.1.0.7rc1-2 (binary compatible) + * 1.0.7 1 10007 (still compatible) + * 1.0.8beta1-4 1 10008 2.1.0.8beta1-4 + * 1.0.8rc1 1 10008 2.1.0.8rc1 + * 1.0.8 1 10008 2.1.0.8 + * 1.0.9beta1-6 1 10009 2.1.0.9beta1-6 + * 1.0.9rc1 1 10009 2.1.0.9rc1 + * 1.0.9beta7-10 1 10009 2.1.0.9beta7-10 + * 1.0.9rc2 1 10009 2.1.0.9rc2 + * 1.0.9 1 10009 2.1.0.9 + * 1.0.10beta1 1 10010 2.1.0.10beta1 + * 1.0.10rc1 1 10010 2.1.0.10rc1 + * 1.0.10 1 10010 2.1.0.10 + * 1.0.11beta1-3 1 10011 2.1.0.11beta1-3 + * 1.0.11rc1 1 10011 2.1.0.11rc1 + * 1.0.11 1 10011 2.1.0.11 + * 1.0.12beta1-2 2 10012 2.1.0.12beta1-2 + * 1.0.12rc1 2 10012 2.1.0.12rc1 + * 1.0.12 2 10012 2.1.0.12 + * 1.1.0a-f - 10100 2.1.1.0a-f (branch abandoned) + * 1.2.0beta1-2 2 10200 2.1.2.0beta1-2 + * 1.2.0beta3-5 3 10200 3.1.2.0beta3-5 + * 1.2.0rc1 3 10200 3.1.2.0rc1 + * 1.2.0 3 10200 3.1.2.0 + * 1.2.1beta1-4 3 10201 3.1.2.1beta1-4 + * 1.2.1rc1-2 3 10201 3.1.2.1rc1-2 + * 1.2.1 3 10201 3.1.2.1 + * 1.2.2beta1-6 12 10202 12.so.0.1.2.2beta1-6 + * 1.0.13beta1 10 10013 10.so.0.1.0.13beta1 + * 1.0.13rc1 10 10013 10.so.0.1.0.13rc1 + * 1.2.2rc1 12 10202 12.so.0.1.2.2rc1 + * 1.0.13 10 10013 10.so.0.1.0.13 + * 1.2.2 12 10202 12.so.0.1.2.2 + * 1.2.3rc1-6 12 10203 12.so.0.1.2.3rc1-6 + * 1.2.3 12 10203 12.so.0.1.2.3 + * 1.2.4beta1-3 13 10204 12.so.0.1.2.4beta1-3 + * 1.0.14rc1 13 10014 10.so.0.1.0.14rc1 + * 1.2.4rc1 13 10204 12.so.0.1.2.4rc1 + * 1.0.14 10 10014 10.so.0.1.0.14 + * 1.2.4 13 10204 12.so.0.1.2.4 + * 1.2.5beta1-2 13 10205 12.so.0.1.2.5beta1-2 + * 1.0.15rc1-3 10 10015 10.so.0.1.0.15rc1-3 + * 1.2.5rc1-3 13 10205 12.so.0.1.2.5rc1-3 + * 1.0.15 10 10015 10.so.0.1.0.15 + * 1.2.5 13 10205 12.so.0.1.2.5 + * 1.2.6beta1-4 13 10206 12.so.0.1.2.6beta1-4 + * 1.0.16 10 10016 10.so.0.1.0.16 + * 1.2.6 13 10206 12.so.0.1.2.6 + * 1.2.7beta1-2 13 10207 12.so.0.1.2.7beta1-2 + * 1.0.17rc1 10 10017 12.so.0.1.0.17rc1 + * 1.2.7rc1 13 10207 12.so.0.1.2.7rc1 + * 1.0.17 10 10017 12.so.0.1.0.17 + * 1.2.7 13 10207 12.so.0.1.2.7 + * 1.2.8beta1-5 13 10208 12.so.0.1.2.8beta1-5 + * 1.0.18rc1-5 10 10018 12.so.0.1.0.18rc1-5 + * 1.2.8rc1-5 13 10208 12.so.0.1.2.8rc1-5 + * 1.0.18 10 10018 12.so.0.1.0.18 + * 1.2.8 13 10208 12.so.0.1.2.8 + * 1.2.9beta1-3 13 10209 12.so.0.1.2.9beta1-3 + * 1.2.9beta4-11 13 10209 12.so.0.9[.0] + * 1.2.9rc1 13 10209 12.so.0.9[.0] + * 1.2.9 13 10209 12.so.0.9[.0] + * 1.2.10beta1-7 13 10210 12.so.0.10[.0] + * 1.2.10rc1-2 13 10210 12.so.0.10[.0] + * 1.2.10 13 10210 12.so.0.10[.0] + * 1.4.0beta1-5 14 10400 14.so.0.0[.0] + * 1.2.11beta1-4 13 10211 12.so.0.11[.0] + * 1.4.0beta7-8 14 10400 14.so.0.0[.0] + * 1.2.11 13 10211 12.so.0.11[.0] + * 1.2.12 13 10212 12.so.0.12[.0] + * 1.4.0beta9-14 14 10400 14.so.0.0[.0] + * 1.2.13 13 10213 12.so.0.13[.0] + * 1.4.0beta15-36 14 10400 14.so.0.0[.0] + * 1.4.0beta37-87 14 10400 14.so.14.0[.0] + * 1.4.0rc01 14 10400 14.so.14.0[.0] + * 1.4.0beta88-109 14 10400 14.so.14.0[.0] + * 1.4.0rc02-08 14 10400 14.so.14.0[.0] + * 1.4.0 14 10400 14.so.14.0[.0] + * 1.4.1beta01-03 14 10401 14.so.14.1[.0] + * 1.4.1rc01 14 10401 14.so.14.1[.0] + * 1.4.1beta04-12 14 10401 14.so.14.1[.0] + * 1.4.1 14 10401 14.so.14.1[.0] + * 1.4.2 14 10402 14.so.14.2[.0] + * 1.4.3 14 10403 14.so.14.3[.0] + * 1.4.4 14 10404 14.so.14.4[.0] + * 1.5.0beta01-58 15 10500 15.so.15.0[.0] + * 1.5.0rc01-07 15 10500 15.so.15.0[.0] + * 1.5.0 15 10500 15.so.15.0[.0] + * 1.5.1beta01-11 15 10501 15.so.15.1[.0] + * 1.5.1rc01-02 15 10501 15.so.15.1[.0] + * 1.5.1 15 10501 15.so.15.1[.0] + * + * Henceforth the source version will match the shared-library major + * and minor numbers; the shared-library major version number will be + * used for changes in backward compatibility, as it is intended. The + * PNG_LIBPNG_VER macro, which is not used within libpng but is available + * for applications, is an unsigned integer of the form xyyzz corresponding + * to the source version x.y.z (leading zeros in y and z). Beta versions + * were given the previous public release number plus a letter, until + * version 1.0.6j; from then on they were given the upcoming public + * release number plus "betaNN" or "rcN". + * + * Binary incompatibility exists only when applications make direct access + * to the info_ptr or png_ptr members through png.h, and the compiled + * application is loaded with a different version of the library. + * + * DLLNUM will change each time there are forward or backward changes + * in binary compatibility (e.g., when a new feature is added). + * + * See libpng-manual.txt or libpng.3 for more information. The PNG + * specification is available as a W3C Recommendation and as an ISO + * Specification, +# endif + +/* Need the time information for converting tIME chunks, it + * defines struct tm: + */ +#ifdef PNG_CONVERT_tIME_SUPPORTED + /* "time.h" functions are not supported on all operating systems */ +# include +#endif + +/* Machine specific configuration. */ +# include "pngconf.h" +#endif + +/* + * Added at libpng-1.2.8 + * + * Ref MSDN: Private as priority over Special + * VS_FF_PRIVATEBUILD File *was not* built using standard release + * procedures. If this value is given, the StringFileInfo block must + * contain a PrivateBuild string. + * + * VS_FF_SPECIALBUILD File *was* built by the original company using + * standard release procedures but is a variation of the standard + * file of the same version number. If this value is given, the + * StringFileInfo block must contain a SpecialBuild string. + */ + +#ifdef PNG_USER_PRIVATEBUILD /* From pnglibconf.h */ +# define PNG_LIBPNG_BUILD_TYPE \ + (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE) +#else +# ifdef PNG_LIBPNG_SPECIALBUILD +# define PNG_LIBPNG_BUILD_TYPE \ + (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL) +# else +# define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE) +# endif +#endif + +#ifndef PNG_VERSION_INFO_ONLY + +/* Inhibit C++ name-mangling for libpng functions but not for system calls. */ +#ifdef __cplusplus +extern "C" { +#endif /* __cplusplus */ + +/* Version information for C files, stored in png.c. This had better match + * the version above. + */ +#define png_libpng_ver png_get_header_ver(NULL) + +/* This file is arranged in several sections: + * + * 1. Any configuration options that can be specified by for the application + * code when it is built. (Build time configuration is in pnglibconf.h) + * 2. Type definitions (base types are defined in pngconf.h), structure + * definitions. + * 3. Exported library functions. + * + * The library source code has additional files (principally pngpriv.h) that + * allow configuration of the library. + */ +/* Section 1: run time configuration + * See pnglibconf.h for build time configuration + * + * Run time configuration allows the application to choose between + * implementations of certain arithmetic APIs. The default is set + * at build time and recorded in pnglibconf.h, but it is safe to + * override these (and only these) settings. Note that this won't + * change what the library does, only application code, and the + * settings can (and probably should) be made on a per-file basis + * by setting the #defines before including png.h + * + * Use macros to read integers from PNG data or use the exported + * functions? + * PNG_USE_READ_MACROS: use the macros (see below) Note that + * the macros evaluate their argument multiple times. + * PNG_NO_USE_READ_MACROS: call the relevant library function. + * + * Use the alternative algorithm for compositing alpha samples that + * does not use division? + * PNG_READ_COMPOSITE_NODIV_SUPPORTED: use the 'no division' + * algorithm. + * PNG_NO_READ_COMPOSITE_NODIV: use the 'division' algorithm. + * + * How to handle benign errors if PNG_ALLOW_BENIGN_ERRORS is + * false? + * PNG_ALLOW_BENIGN_ERRORS: map calls to the benign error + * APIs to png_warning. + * Otherwise the calls are mapped to png_error. + */ + +/* Section 2: type definitions, including structures and compile time + * constants. + * See pngconf.h for base types that vary by machine/system + */ + +/* This triggers a compiler error in png.c, if png.c and png.h + * do not agree upon the version number. + */ +typedef char* png_libpng_version_1_5_1; + +/* Three color definitions. The order of the red, green, and blue, (and the + * exact size) is not important, although the size of the fields need to + * be png_byte or png_uint_16 (as defined below). + */ +typedef struct png_color_struct +{ + png_byte red; + png_byte green; + png_byte blue; +} png_color; +typedef png_color FAR * png_colorp; +typedef PNG_CONST png_color FAR * png_const_colorp; +typedef png_color FAR * FAR * png_colorpp; + +typedef struct png_color_16_struct +{ + png_byte index; /* used for palette files */ + png_uint_16 red; /* for use in red green blue files */ + png_uint_16 green; + png_uint_16 blue; + png_uint_16 gray; /* for use in grayscale files */ +} png_color_16; +typedef png_color_16 FAR * png_color_16p; +typedef PNG_CONST png_color_16 FAR * png_const_color_16p; +typedef png_color_16 FAR * FAR * png_color_16pp; + +typedef struct png_color_8_struct +{ + png_byte red; /* for use in red green blue files */ + png_byte green; + png_byte blue; + png_byte gray; /* for use in grayscale files */ + png_byte alpha; /* for alpha channel files */ +} png_color_8; +typedef png_color_8 FAR * png_color_8p; +typedef PNG_CONST png_color_8 FAR * png_const_color_8p; +typedef png_color_8 FAR * FAR * png_color_8pp; + +/* + * The following two structures are used for the in-core representation + * of sPLT chunks. + */ +typedef struct png_sPLT_entry_struct +{ + png_uint_16 red; + png_uint_16 green; + png_uint_16 blue; + png_uint_16 alpha; + png_uint_16 frequency; +} png_sPLT_entry; +typedef png_sPLT_entry FAR * png_sPLT_entryp; +typedef PNG_CONST png_sPLT_entry FAR * png_const_sPLT_entryp; +typedef png_sPLT_entry FAR * FAR * png_sPLT_entrypp; + +/* When the depth of the sPLT palette is 8 bits, the color and alpha samples + * occupy the LSB of their respective members, and the MSB of each member + * is zero-filled. The frequency member always occupies the full 16 bits. + */ + +typedef struct png_sPLT_struct +{ + png_charp name; /* palette name */ + png_byte depth; /* depth of palette samples */ + png_sPLT_entryp entries; /* palette entries */ + png_int_32 nentries; /* number of palette entries */ +} png_sPLT_t; +typedef png_sPLT_t FAR * png_sPLT_tp; +typedef PNG_CONST png_sPLT_t FAR * png_const_sPLT_tp; +typedef png_sPLT_t FAR * FAR * png_sPLT_tpp; + +#ifdef PNG_TEXT_SUPPORTED +/* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file, + * and whether that contents is compressed or not. The "key" field + * points to a regular zero-terminated C string. The "text", "lang", and + * "lang_key" fields can be regular C strings, empty strings, or NULL pointers. + * However, the * structure returned by png_get_text() will always contain + * regular zero-terminated C strings (possibly empty), never NULL pointers, + * so they can be safely used in printf() and other string-handling functions. + */ +typedef struct png_text_struct +{ + int compression; /* compression value: + -1: tEXt, none + 0: zTXt, deflate + 1: iTXt, none + 2: iTXt, deflate */ + png_charp key; /* keyword, 1-79 character description of "text" */ + png_charp text; /* comment, may be an empty string (ie "") + or a NULL pointer */ + png_size_t text_length; /* length of the text string */ + png_size_t itxt_length; /* length of the itxt string */ + png_charp lang; /* language code, 0-79 characters + or a NULL pointer */ + png_charp lang_key; /* keyword translated UTF-8 string, 0 or more + chars or a NULL pointer */ +} png_text; +typedef png_text FAR * png_textp; +typedef PNG_CONST png_text FAR * png_const_textp; +typedef png_text FAR * FAR * png_textpp; +#endif + +/* Supported compression types for text in PNG files (tEXt, and zTXt). + * The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. */ +#define PNG_TEXT_COMPRESSION_NONE_WR -3 +#define PNG_TEXT_COMPRESSION_zTXt_WR -2 +#define PNG_TEXT_COMPRESSION_NONE -1 +#define PNG_TEXT_COMPRESSION_zTXt 0 +#define PNG_ITXT_COMPRESSION_NONE 1 +#define PNG_ITXT_COMPRESSION_zTXt 2 +#define PNG_TEXT_COMPRESSION_LAST 3 /* Not a valid value */ + +/* png_time is a way to hold the time in an machine independent way. + * Two conversions are provided, both from time_t and struct tm. There + * is no portable way to convert to either of these structures, as far + * as I know. If you know of a portable way, send it to me. As a side + * note - PNG has always been Year 2000 compliant! + */ +typedef struct png_time_struct +{ + png_uint_16 year; /* full year, as in, 1995 */ + png_byte month; /* month of year, 1 - 12 */ + png_byte day; /* day of month, 1 - 31 */ + png_byte hour; /* hour of day, 0 - 23 */ + png_byte minute; /* minute of hour, 0 - 59 */ + png_byte second; /* second of minute, 0 - 60 (for leap seconds) */ +} png_time; +typedef png_time FAR * png_timep; +typedef PNG_CONST png_time FAR * png_const_timep; +typedef png_time FAR * FAR * png_timepp; + +#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) || \ + defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED) +/* png_unknown_chunk is a structure to hold queued chunks for which there is + * no specific support. The idea is that we can use this to queue + * up private chunks for output even though the library doesn't actually + * know about their semantics. + */ +typedef struct png_unknown_chunk_t +{ + png_byte name[5]; + png_byte *data; + png_size_t size; + + /* libpng-using applications should NOT directly modify this byte. */ + png_byte location; /* mode of operation at read time */ +} +png_unknown_chunk; +typedef png_unknown_chunk FAR * png_unknown_chunkp; +typedef PNG_CONST png_unknown_chunk FAR * png_const_unknown_chunkp; +typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp; +#endif + +typedef struct png_info_def png_info; +typedef png_info FAR * png_infop; +typedef PNG_CONST png_info FAR * png_const_infop; +typedef png_info FAR * FAR * png_infopp; + +/* Maximum positive integer used in PNG is (2^31)-1 */ +#define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL) +#define PNG_UINT_32_MAX ((png_uint_32)(-1)) +#define PNG_SIZE_MAX ((png_size_t)(-1)) + +/* These are constants for fixed point values encoded in the + * PNG specification manner (x100000) + */ +#define PNG_FP_1 100000 +#define PNG_FP_HALF 50000 + +/* These describe the color_type field in png_info. */ +/* color type masks */ +#define PNG_COLOR_MASK_PALETTE 1 +#define PNG_COLOR_MASK_COLOR 2 +#define PNG_COLOR_MASK_ALPHA 4 + +/* color types. Note that not all combinations are legal */ +#define PNG_COLOR_TYPE_GRAY 0 +#define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE) +#define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR) +#define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA) +#define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA) +/* aliases */ +#define PNG_COLOR_TYPE_RGBA PNG_COLOR_TYPE_RGB_ALPHA +#define PNG_COLOR_TYPE_GA PNG_COLOR_TYPE_GRAY_ALPHA + +/* This is for compression type. PNG 1.0-1.2 only define the single type. */ +#define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */ +#define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE + +/* This is for filter type. PNG 1.0-1.2 only define the single type. */ +#define PNG_FILTER_TYPE_BASE 0 /* Single row per-byte filtering */ +#define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */ +#define PNG_FILTER_TYPE_DEFAULT PNG_FILTER_TYPE_BASE + +/* These are for the interlacing type. These values should NOT be changed. */ +#define PNG_INTERLACE_NONE 0 /* Non-interlaced image */ +#define PNG_INTERLACE_ADAM7 1 /* Adam7 interlacing */ +#define PNG_INTERLACE_LAST 2 /* Not a valid value */ + +/* These are for the oFFs chunk. These values should NOT be changed. */ +#define PNG_OFFSET_PIXEL 0 /* Offset in pixels */ +#define PNG_OFFSET_MICROMETER 1 /* Offset in micrometers (1/10^6 meter) */ +#define PNG_OFFSET_LAST 2 /* Not a valid value */ + +/* These are for the pCAL chunk. These values should NOT be changed. */ +#define PNG_EQUATION_LINEAR 0 /* Linear transformation */ +#define PNG_EQUATION_BASE_E 1 /* Exponential base e transform */ +#define PNG_EQUATION_ARBITRARY 2 /* Arbitrary base exponential transform */ +#define PNG_EQUATION_HYPERBOLIC 3 /* Hyperbolic sine transformation */ +#define PNG_EQUATION_LAST 4 /* Not a valid value */ + +/* These are for the sCAL chunk. These values should NOT be changed. */ +#define PNG_SCALE_UNKNOWN 0 /* unknown unit (image scale) */ +#define PNG_SCALE_METER 1 /* meters per pixel */ +#define PNG_SCALE_RADIAN 2 /* radians per pixel */ +#define PNG_SCALE_LAST 3 /* Not a valid value */ + +/* These are for the pHYs chunk. These values should NOT be changed. */ +#define PNG_RESOLUTION_UNKNOWN 0 /* pixels/unknown unit (aspect ratio) */ +#define PNG_RESOLUTION_METER 1 /* pixels/meter */ +#define PNG_RESOLUTION_LAST 2 /* Not a valid value */ + +/* These are for the sRGB chunk. These values should NOT be changed. */ +#define PNG_sRGB_INTENT_PERCEPTUAL 0 +#define PNG_sRGB_INTENT_RELATIVE 1 +#define PNG_sRGB_INTENT_SATURATION 2 +#define PNG_sRGB_INTENT_ABSOLUTE 3 +#define PNG_sRGB_INTENT_LAST 4 /* Not a valid value */ + +/* This is for text chunks */ +#define PNG_KEYWORD_MAX_LENGTH 79 + +/* Maximum number of entries in PLTE/sPLT/tRNS arrays */ +#define PNG_MAX_PALETTE_LENGTH 256 + +/* These determine if an ancillary chunk's data has been successfully read + * from the PNG header, or if the application has filled in the corresponding + * data in the info_struct to be written into the output file. The values + * of the PNG_INFO_ defines should NOT be changed. + */ +#define PNG_INFO_gAMA 0x0001 +#define PNG_INFO_sBIT 0x0002 +#define PNG_INFO_cHRM 0x0004 +#define PNG_INFO_PLTE 0x0008 +#define PNG_INFO_tRNS 0x0010 +#define PNG_INFO_bKGD 0x0020 +#define PNG_INFO_hIST 0x0040 +#define PNG_INFO_pHYs 0x0080 +#define PNG_INFO_oFFs 0x0100 +#define PNG_INFO_tIME 0x0200 +#define PNG_INFO_pCAL 0x0400 +#define PNG_INFO_sRGB 0x0800 /* GR-P, 0.96a */ +#define PNG_INFO_iCCP 0x1000 /* ESR, 1.0.6 */ +#define PNG_INFO_sPLT 0x2000 /* ESR, 1.0.6 */ +#define PNG_INFO_sCAL 0x4000 /* ESR, 1.0.6 */ +#define PNG_INFO_IDAT 0x8000L /* ESR, 1.0.6 */ + +/* This is used for the transformation routines, as some of them + * change these values for the row. It also should enable using + * the routines for other purposes. + */ +typedef struct png_row_info_struct +{ + png_uint_32 width; /* width of row */ + png_size_t rowbytes; /* number of bytes in row */ + png_byte color_type; /* color type of row */ + png_byte bit_depth; /* bit depth of row */ + png_byte channels; /* number of channels (1, 2, 3, or 4) */ + png_byte pixel_depth; /* bits per pixel (depth * channels) */ +} png_row_info; + +typedef png_row_info FAR * png_row_infop; +typedef png_row_info FAR * FAR * png_row_infopp; + +/* These are the function types for the I/O functions and for the functions + * that allow the user to override the default I/O functions with his or her + * own. The png_error_ptr type should match that of user-supplied warning + * and error functions, while the png_rw_ptr type should match that of the + * user read/write data functions. Note that the 'write' function must not + * modify the buffer it is passed. The 'read' function, on the other hand, is + * expected to return the read data in the buffer. + */ +typedef struct png_struct_def png_struct; +typedef PNG_CONST png_struct FAR * png_const_structp; +typedef png_struct FAR * png_structp; + +typedef PNG_CALLBACK(void, *png_error_ptr, (png_structp, png_const_charp), ); +typedef PNG_CALLBACK(void, *png_rw_ptr, (png_structp, png_bytep, png_size_t), ); +typedef PNG_CALLBACK(void, *png_flush_ptr, (png_structp), ); +typedef PNG_CALLBACK(void, *png_read_status_ptr, (png_structp, png_uint_32, + int), ); +typedef PNG_CALLBACK(void, *png_write_status_ptr, (png_structp, png_uint_32, + int), ); + +#ifdef PNG_PROGRESSIVE_READ_SUPPORTED +typedef PNG_CALLBACK(void, *png_progressive_info_ptr, + (png_structp, png_infop), ); +typedef PNG_CALLBACK(void, *png_progressive_end_ptr, + (png_structp, png_infop), ); +typedef PNG_CALLBACK(void, *png_progressive_row_ptr, + (png_structp, png_bytep, png_uint_32, int), ); +#endif + +#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ + defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) +typedef PNG_CALLBACK(void, *png_user_transform_ptr, + (png_structp, png_row_infop, png_bytep), ); +#endif + +#ifdef PNG_USER_CHUNKS_SUPPORTED +typedef PNG_CALLBACK(int, *png_user_chunk_ptr, (png_structp, + png_unknown_chunkp), ); +#endif +#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED +typedef PNG_CALLBACK(void, *png_unknown_chunk_ptr, (png_structp), ); +#endif + +#ifdef PNG_SETJMP_SUPPORTED +/* This must match the function definition in , and the + * application must include this before png.h to obtain the definition + * of jmp_buf. The function is required to be PNG_NORETURN. (Note that + * PNG_PTR_NORETURN is used here because current versions of the Microsoft + * C compiler do not support the PNG_NORETURN attribute on a pointer.) + * + * If you get a type warning from the compiler when linking against this line + * then your compiler has 'longjmp' that does not match the requirements of the + * compiler that built libpng. You will have to write a wrapper function for + * your compiler's longjmp and call png_set_longjmp_fn directly (not via the + * png_jmpbuf macro.) + * + * If you get a warning here while building the library you will need to make + * changes to ensure that pnglibconf.h records the calling convention used by + * your compiler. This may be very difficult - try using a different compiler + * to build the library! + */ +typedef PNG_FUNCTION(void, (PNGCAPI *png_longjmp_ptr), PNGARG((jmp_buf, int)), + PNG_PTR_NORETURN); +#endif + +/* Transform masks for the high-level interface */ +#define PNG_TRANSFORM_IDENTITY 0x0000 /* read and write */ +#define PNG_TRANSFORM_STRIP_16 0x0001 /* read only */ +#define PNG_TRANSFORM_STRIP_ALPHA 0x0002 /* read only */ +#define PNG_TRANSFORM_PACKING 0x0004 /* read and write */ +#define PNG_TRANSFORM_PACKSWAP 0x0008 /* read and write */ +#define PNG_TRANSFORM_EXPAND 0x0010 /* read only */ +#define PNG_TRANSFORM_INVERT_MONO 0x0020 /* read and write */ +#define PNG_TRANSFORM_SHIFT 0x0040 /* read and write */ +#define PNG_TRANSFORM_BGR 0x0080 /* read and write */ +#define PNG_TRANSFORM_SWAP_ALPHA 0x0100 /* read and write */ +#define PNG_TRANSFORM_SWAP_ENDIAN 0x0200 /* read and write */ +#define PNG_TRANSFORM_INVERT_ALPHA 0x0400 /* read and write */ +#define PNG_TRANSFORM_STRIP_FILLER 0x0800 /* write only */ +/* Added to libpng-1.2.34 */ +#define PNG_TRANSFORM_STRIP_FILLER_BEFORE PNG_TRANSFORM_STRIP_FILLER +#define PNG_TRANSFORM_STRIP_FILLER_AFTER 0x1000 /* write only */ +/* Added to libpng-1.4.0 */ +#define PNG_TRANSFORM_GRAY_TO_RGB 0x2000 /* read only */ + +/* Flags for MNG supported features */ +#define PNG_FLAG_MNG_EMPTY_PLTE 0x01 +#define PNG_FLAG_MNG_FILTER_64 0x04 +#define PNG_ALL_MNG_FEATURES 0x05 + +/* NOTE: prior to 1.5 these functions had no 'API' style declaration, + * this allowed the zlib default functions to be used on Windows + * platforms. In 1.5 the zlib default malloc (which just calls malloc and + * ignores the first argument) should be completely compatible with the + * following. + */ +typedef PNG_CALLBACK(png_voidp, *png_malloc_ptr, (png_structp, + png_alloc_size_t), ); +typedef PNG_CALLBACK(void, *png_free_ptr, (png_structp, png_voidp), ); + +typedef png_struct FAR * FAR * png_structpp; + +/* Section 3: exported functions + * Here are the function definitions most commonly used. This is not + * the place to find out how to use libpng. See libpng-manual.txt for the + * full explanation, see example.c for the summary. This just provides + * a simple one line description of the use of each function. + * + * The PNG_EXPORT() and PNG_EXPORTA() macros used below are defined in + * pngconf.h and in the *.dfn files in the scripts directory. + * + * PNG_EXPORT(ordinal, type, name, (args)); + * + * ordinal: ordinal that is used while building + * *.def files. The ordinal value is only + * relevant when preprocessing png.h with + * the *.dfn files for building symbol table + * entries, and are removed by pngconf.h. + * type: return type of the function + * name: function name + * args: function arguments, with types + * + * When we wish to append attributes to a function prototype we use + * the PNG_EXPORTA() macro instead. + * + * PNG_EXPORTA(ordinal, type, name, (args), attributes); + * + * ordinal, type, name, and args: same as in PNG_EXPORT(). + * attributes: function attributes + */ + +/* Returns the version number of the library */ +PNG_EXPORT(1, png_uint_32, png_access_version_number, (void)); + +/* Tell lib we have already handled the first magic bytes. + * Handling more than 8 bytes from the beginning of the file is an error. + */ +PNG_EXPORT(2, void, png_set_sig_bytes, (png_structp png_ptr, int num_bytes)); + +/* Check sig[start] through sig[start + num_to_check - 1] to see if it's a + * PNG file. Returns zero if the supplied bytes match the 8-byte PNG + * signature, and non-zero otherwise. Having num_to_check == 0 or + * start > 7 will always fail (ie return non-zero). + */ +PNG_EXPORT(3, int, png_sig_cmp, (png_const_bytep sig, png_size_t start, + png_size_t num_to_check)); + +/* Simple signature checking function. This is the same as calling + * png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n). + */ +#define png_check_sig(sig, n) !png_sig_cmp((sig), 0, (n)) + +/* Allocate and initialize png_ptr struct for reading, and any other memory. */ +PNG_EXPORTA(4, png_structp, png_create_read_struct, + (png_const_charp user_png_ver, png_voidp error_ptr, + png_error_ptr error_fn, png_error_ptr warn_fn), + PNG_ALLOCATED); + +/* Allocate and initialize png_ptr struct for writing, and any other memory */ +PNG_EXPORTA(5, png_structp, png_create_write_struct, + (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, + png_error_ptr warn_fn), + PNG_ALLOCATED); + +PNG_EXPORT(6, png_size_t, png_get_compression_buffer_size, + (png_const_structp png_ptr)); + +PNG_EXPORT(7, void, png_set_compression_buffer_size, (png_structp png_ptr, + png_size_t size)); + +/* Moved from pngconf.h in 1.4.0 and modified to ensure setjmp/longjmp + * match up. + */ +#ifdef PNG_SETJMP_SUPPORTED +/* This function returns the jmp_buf built in to *png_ptr. It must be + * supplied with an appropriate 'longjmp' function to use on that jmp_buf + * unless the default error function is overridden in which case NULL is + * acceptable. The size of the jmp_buf is checked against the actual size + * allocated by the library - the call will return NULL on a mismatch + * indicating an ABI mismatch. + */ +PNG_EXPORT(8, jmp_buf*, png_set_longjmp_fn, (png_structp png_ptr, + png_longjmp_ptr longjmp_fn, size_t jmp_buf_size)); +# define png_jmpbuf(png_ptr) \ + (*png_set_longjmp_fn((png_ptr), longjmp, sizeof (jmp_buf))) +#else +# define png_jmpbuf(png_ptr) \ + (LIBPNG_WAS_COMPILED_WITH__PNG_NO_SETJMP) +#endif +/* This function should be used by libpng applications in place of + * longjmp(png_ptr->jmpbuf, val). If longjmp_fn() has been set, it + * will use it; otherwise it will call PNG_ABORT(). This function was + * added in libpng-1.5.0. + */ +PNG_EXPORTA(9, void, png_longjmp, (png_structp png_ptr, int val), + PNG_NORETURN); + +#ifdef PNG_READ_SUPPORTED +/* Reset the compression stream */ +PNG_EXPORT(10, int, png_reset_zstream, (png_structp png_ptr)); +#endif + +/* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */ +#ifdef PNG_USER_MEM_SUPPORTED +PNG_EXPORTA(11, png_structp, png_create_read_struct_2, + (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, + png_error_ptr warn_fn, + png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn), + PNG_ALLOCATED); +PNG_EXPORTA(12, png_structp, png_create_write_struct_2, + (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, + png_error_ptr warn_fn, + png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn), + PNG_ALLOCATED); +#endif + +/* Write the PNG file signature. */ +PNG_EXPORT(13, void, png_write_sig, (png_structp png_ptr)); + +/* Write a PNG chunk - size, type, (optional) data, CRC. */ +PNG_EXPORT(14, void, png_write_chunk, (png_structp png_ptr, png_const_bytep + chunk_name, png_const_bytep data, png_size_t length)); + +/* Write the start of a PNG chunk - length and chunk name. */ +PNG_EXPORT(15, void, png_write_chunk_start, (png_structp png_ptr, + png_const_bytep chunk_name, png_uint_32 length)); + +/* Write the data of a PNG chunk started with png_write_chunk_start(). */ +PNG_EXPORT(16, void, png_write_chunk_data, (png_structp png_ptr, + png_const_bytep data, png_size_t length)); + +/* Finish a chunk started with png_write_chunk_start() (includes CRC). */ +PNG_EXPORT(17, void, png_write_chunk_end, (png_structp png_ptr)); + +/* Allocate and initialize the info structure */ +PNG_EXPORTA(18, png_infop, png_create_info_struct, (png_structp png_ptr), + PNG_ALLOCATED); + +PNG_EXPORT(19, void, png_info_init_3, (png_infopp info_ptr, + png_size_t png_info_struct_size)); + +/* Writes all the PNG information before the image. */ +PNG_EXPORT(20, void, png_write_info_before_PLTE, + (png_structp png_ptr, png_infop info_ptr)); +PNG_EXPORT(21, void, png_write_info, + (png_structp png_ptr, png_infop info_ptr)); + +#ifdef PNG_SEQUENTIAL_READ_SUPPORTED +/* Read the information before the actual image data. */ +PNG_EXPORT(22, void, png_read_info, + (png_structp png_ptr, png_infop info_ptr)); +#endif + +#ifdef PNG_TIME_RFC1123_SUPPORTED +PNG_EXPORT(23, png_const_charp, png_convert_to_rfc1123, + (png_structp png_ptr, + png_const_timep ptime)); +#endif + +#ifdef PNG_CONVERT_tIME_SUPPORTED +/* Convert from a struct tm to png_time */ +PNG_EXPORT(24, void, png_convert_from_struct_tm, (png_timep ptime, + PNG_CONST struct tm FAR * ttime)); + +/* Convert from time_t to png_time. Uses gmtime() */ +PNG_EXPORT(25, void, png_convert_from_time_t, + (png_timep ptime, time_t ttime)); +#endif /* PNG_CONVERT_tIME_SUPPORTED */ + +#ifdef PNG_READ_EXPAND_SUPPORTED +/* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */ +PNG_EXPORT(26, void, png_set_expand, (png_structp png_ptr)); +PNG_EXPORT(27, void, png_set_expand_gray_1_2_4_to_8, (png_structp png_ptr)); +PNG_EXPORT(28, void, png_set_palette_to_rgb, (png_structp png_ptr)); +PNG_EXPORT(29, void, png_set_tRNS_to_alpha, (png_structp png_ptr)); +#endif + +#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) +/* Use blue, green, red order for pixels. */ +PNG_EXPORT(30, void, png_set_bgr, (png_structp png_ptr)); +#endif + +#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED +/* Expand the grayscale to 24-bit RGB if necessary. */ +PNG_EXPORT(31, void, png_set_gray_to_rgb, (png_structp png_ptr)); +#endif + +#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED +/* Reduce RGB to grayscale. */ +PNG_FP_EXPORT(32, void, png_set_rgb_to_gray, (png_structp png_ptr, + int error_action, double red, double green)); +PNG_FIXED_EXPORT(33, void, png_set_rgb_to_gray_fixed, (png_structp png_ptr, + int error_action, png_fixed_point red, png_fixed_point green)); + +PNG_EXPORT(34, png_byte, png_get_rgb_to_gray_status, (png_const_structp + png_ptr)); +#endif + +PNG_EXPORT(35, void, png_build_grayscale_palette, (int bit_depth, + png_colorp palette)); + +#ifdef PNG_READ_STRIP_ALPHA_SUPPORTED +PNG_EXPORT(36, void, png_set_strip_alpha, (png_structp png_ptr)); +#endif + +#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \ + defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) +PNG_EXPORT(37, void, png_set_swap_alpha, (png_structp png_ptr)); +#endif + +#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \ + defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) +PNG_EXPORT(38, void, png_set_invert_alpha, (png_structp png_ptr)); +#endif + +#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) +/* Add a filler byte to 8-bit Gray or 24-bit RGB images. */ +PNG_EXPORT(39, void, png_set_filler, (png_structp png_ptr, png_uint_32 filler, + int flags)); +/* The values of the PNG_FILLER_ defines should NOT be changed */ +# define PNG_FILLER_BEFORE 0 +# define PNG_FILLER_AFTER 1 +/* Add an alpha byte to 8-bit Gray or 24-bit RGB images. */ +PNG_EXPORT(40, void, png_set_add_alpha, + (png_structp png_ptr, png_uint_32 filler, + int flags)); +#endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */ + +#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) +/* Swap bytes in 16-bit depth files. */ +PNG_EXPORT(41, void, png_set_swap, (png_structp png_ptr)); +#endif + +#if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED) +/* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */ +PNG_EXPORT(42, void, png_set_packing, (png_structp png_ptr)); +#endif + +#if defined(PNG_READ_PACKSWAP_SUPPORTED) || \ + defined(PNG_WRITE_PACKSWAP_SUPPORTED) +/* Swap packing order of pixels in bytes. */ +PNG_EXPORT(43, void, png_set_packswap, (png_structp png_ptr)); +#endif + +#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) +/* Converts files to legal bit depths. */ +PNG_EXPORT(44, void, png_set_shift, (png_structp png_ptr, png_const_color_8p + true_bits)); +#endif + +#if defined(PNG_READ_INTERLACING_SUPPORTED) || \ + defined(PNG_WRITE_INTERLACING_SUPPORTED) +/* Have the code handle the interlacing. Returns the number of passes. + * MUST be called before png_read_update_info or png_start_read_image, + * otherwise it will not have the desired effect. Note that it is still + * necessary to call png_read_row or png_read_rows png_get_image_height + * times for each pass. +*/ +PNG_EXPORT(45, int, png_set_interlace_handling, (png_structp png_ptr)); +#endif + +#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) +/* Invert monochrome files */ +PNG_EXPORT(46, void, png_set_invert_mono, (png_structp png_ptr)); +#endif + +#ifdef PNG_READ_BACKGROUND_SUPPORTED +/* Handle alpha and tRNS by replacing with a background color. */ +PNG_FP_EXPORT(47, void, png_set_background, (png_structp png_ptr, + png_const_color_16p background_color, int background_gamma_code, + int need_expand, double background_gamma)); +PNG_FIXED_EXPORT(215, void, png_set_background_fixed, (png_structp png_ptr, + png_const_color_16p background_color, int background_gamma_code, + int need_expand, png_fixed_point background_gamma)); +#endif +#ifdef PNG_READ_BACKGROUND_SUPPORTED +# define PNG_BACKGROUND_GAMMA_UNKNOWN 0 +# define PNG_BACKGROUND_GAMMA_SCREEN 1 +# define PNG_BACKGROUND_GAMMA_FILE 2 +# define PNG_BACKGROUND_GAMMA_UNIQUE 3 +#endif + +#ifdef PNG_READ_16_TO_8_SUPPORTED +/* Strip the second byte of information from a 16-bit depth file. */ +PNG_EXPORT(48, void, png_set_strip_16, (png_structp png_ptr)); +#endif + +#ifdef PNG_READ_QUANTIZE_SUPPORTED +/* Turn on quantizing, and reduce the palette to the number of colors + * available. + */ +PNG_EXPORT(49, void, png_set_quantize, + (png_structp png_ptr, png_colorp palette, + int num_palette, int maximum_colors, png_const_uint_16p histogram, + int full_quantize)); +#endif + +#ifdef PNG_READ_GAMMA_SUPPORTED +/* The threshold on gamma processing is configurable but hard-wired into the + * library. The following is the floating point variant. + */ +#define PNG_GAMMA_THRESHOLD (PNG_GAMMA_THRESHOLD_FIXED*.00001) + +/* Handle gamma correction. Screen_gamma=(display_exponent) */ +PNG_FP_EXPORT(50, void, png_set_gamma, + (png_structp png_ptr, double screen_gamma, + double default_file_gamma)); +PNG_FIXED_EXPORT(208, void, png_set_gamma_fixed, (png_structp png_ptr, + png_fixed_point screen_gamma, png_fixed_point default_file_gamma)); +#endif + +#ifdef PNG_WRITE_FLUSH_SUPPORTED +/* Set how many lines between output flushes - 0 for no flushing */ +PNG_EXPORT(51, void, png_set_flush, (png_structp png_ptr, int nrows)); +/* Flush the current PNG output buffer */ +PNG_EXPORT(52, void, png_write_flush, (png_structp png_ptr)); +#endif + +/* Optional update palette with requested transformations */ +PNG_EXPORT(53, void, png_start_read_image, (png_structp png_ptr)); + +/* Optional call to update the users info structure */ +PNG_EXPORT(54, void, png_read_update_info, + (png_structp png_ptr, png_infop info_ptr)); + +#ifdef PNG_SEQUENTIAL_READ_SUPPORTED +/* Read one or more rows of image data. */ +PNG_EXPORT(55, void, png_read_rows, (png_structp png_ptr, png_bytepp row, + png_bytepp display_row, png_uint_32 num_rows)); +#endif + +#ifdef PNG_SEQUENTIAL_READ_SUPPORTED +/* Read a row of data. */ +PNG_EXPORT(56, void, png_read_row, (png_structp png_ptr, png_bytep row, + png_bytep display_row)); +#endif + +#ifdef PNG_SEQUENTIAL_READ_SUPPORTED +/* Read the whole image into memory at once. */ +PNG_EXPORT(57, void, png_read_image, (png_structp png_ptr, png_bytepp image)); +#endif + +/* Write a row of image data */ +PNG_EXPORT(58, void, png_write_row, + (png_structp png_ptr, png_const_bytep row)); + +/* Write a few rows of image data: (*row) is not written; however, the type + * is declared as writeable to maintain compatibility with previous versions + * of libpng and to allow the 'display_row' array from read_rows to be passed + * unchanged to write_rows. + */ +PNG_EXPORT(59, void, png_write_rows, (png_structp png_ptr, png_bytepp row, + png_uint_32 num_rows)); + +/* Write the image data */ +PNG_EXPORT(60, void, png_write_image, + (png_structp png_ptr, png_bytepp image)); + +/* Write the end of the PNG file. */ +PNG_EXPORT(61, void, png_write_end, + (png_structp png_ptr, png_infop info_ptr)); + +#ifdef PNG_SEQUENTIAL_READ_SUPPORTED +/* Read the end of the PNG file. */ +PNG_EXPORT(62, void, png_read_end, (png_structp png_ptr, png_infop info_ptr)); +#endif + +/* Free any memory associated with the png_info_struct */ +PNG_EXPORT(63, void, png_destroy_info_struct, (png_structp png_ptr, + png_infopp info_ptr_ptr)); + +/* Free any memory associated with the png_struct and the png_info_structs */ +PNG_EXPORT(64, void, png_destroy_read_struct, (png_structpp png_ptr_ptr, + png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr)); + +/* Free any memory associated with the png_struct and the png_info_structs */ +PNG_EXPORT(65, void, png_destroy_write_struct, (png_structpp png_ptr_ptr, + png_infopp info_ptr_ptr)); + +/* Set the libpng method of handling chunk CRC errors */ +PNG_EXPORT(66, void, png_set_crc_action, + (png_structp png_ptr, int crit_action, int ancil_action)); + +/* Values for png_set_crc_action() say how to handle CRC errors in + * ancillary and critical chunks, and whether to use the data contained + * therein. Note that it is impossible to "discard" data in a critical + * chunk. For versions prior to 0.90, the action was always error/quit, + * whereas in version 0.90 and later, the action for CRC errors in ancillary + * chunks is warn/discard. These values should NOT be changed. + * + * value action:critical action:ancillary + */ +#define PNG_CRC_DEFAULT 0 /* error/quit warn/discard data */ +#define PNG_CRC_ERROR_QUIT 1 /* error/quit error/quit */ +#define PNG_CRC_WARN_DISCARD 2 /* (INVALID) warn/discard data */ +#define PNG_CRC_WARN_USE 3 /* warn/use data warn/use data */ +#define PNG_CRC_QUIET_USE 4 /* quiet/use data quiet/use data */ +#define PNG_CRC_NO_CHANGE 5 /* use current value use current value */ + +/* These functions give the user control over the scan-line filtering in + * libpng and the compression methods used by zlib. These functions are + * mainly useful for testing, as the defaults should work with most users. + * Those users who are tight on memory or want faster performance at the + * expense of compression can modify them. See the compression library + * header file (zlib.h) for an explination of the compression functions. + */ + +/* Set the filtering method(s) used by libpng. Currently, the only valid + * value for "method" is 0. + */ +PNG_EXPORT(67, void, png_set_filter, + (png_structp png_ptr, int method, int filters)); + +/* Flags for png_set_filter() to say which filters to use. The flags + * are chosen so that they don't conflict with real filter types + * below, in case they are supplied instead of the #defined constants. + * These values should NOT be changed. + */ +#define PNG_NO_FILTERS 0x00 +#define PNG_FILTER_NONE 0x08 +#define PNG_FILTER_SUB 0x10 +#define PNG_FILTER_UP 0x20 +#define PNG_FILTER_AVG 0x40 +#define PNG_FILTER_PAETH 0x80 +#define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \ + PNG_FILTER_AVG | PNG_FILTER_PAETH) + +/* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now. + * These defines should NOT be changed. + */ +#define PNG_FILTER_VALUE_NONE 0 +#define PNG_FILTER_VALUE_SUB 1 +#define PNG_FILTER_VALUE_UP 2 +#define PNG_FILTER_VALUE_AVG 3 +#define PNG_FILTER_VALUE_PAETH 4 +#define PNG_FILTER_VALUE_LAST 5 + +#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED /* EXPERIMENTAL */ +/* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_ + * defines, either the default (minimum-sum-of-absolute-differences), or + * the experimental method (weighted-minimum-sum-of-absolute-differences). + * + * Weights are factors >= 1.0, indicating how important it is to keep the + * filter type consistent between rows. Larger numbers mean the current + * filter is that many times as likely to be the same as the "num_weights" + * previous filters. This is cumulative for each previous row with a weight. + * There needs to be "num_weights" values in "filter_weights", or it can be + * NULL if the weights aren't being specified. Weights have no influence on + * the selection of the first row filter. Well chosen weights can (in theory) + * improve the compression for a given image. + * + * Costs are factors >= 1.0 indicating the relative decoding costs of a + * filter type. Higher costs indicate more decoding expense, and are + * therefore less likely to be selected over a filter with lower computational + * costs. There needs to be a value in "filter_costs" for each valid filter + * type (given by PNG_FILTER_VALUE_LAST), or it can be NULL if you aren't + * setting the costs. Costs try to improve the speed of decompression without + * unduly increasing the compressed image size. + * + * A negative weight or cost indicates the default value is to be used, and + * values in the range [0.0, 1.0) indicate the value is to remain unchanged. + * The default values for both weights and costs are currently 1.0, but may + * change if good general weighting/cost heuristics can be found. If both + * the weights and costs are set to 1.0, this degenerates the WEIGHTED method + * to the UNWEIGHTED method, but with added encoding time/computation. + */ +PNG_FP_EXPORT(68, void, png_set_filter_heuristics, (png_structp png_ptr, + int heuristic_method, int num_weights, png_const_doublep filter_weights, + png_const_doublep filter_costs)); +PNG_FIXED_EXPORT(209, void, png_set_filter_heuristics_fixed, + (png_structp png_ptr, + int heuristic_method, int num_weights, png_const_fixed_point_p + filter_weights, png_const_fixed_point_p filter_costs)); +#endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */ + +/* Heuristic used for row filter selection. These defines should NOT be + * changed. + */ +#define PNG_FILTER_HEURISTIC_DEFAULT 0 /* Currently "UNWEIGHTED" */ +#define PNG_FILTER_HEURISTIC_UNWEIGHTED 1 /* Used by libpng < 0.95 */ +#define PNG_FILTER_HEURISTIC_WEIGHTED 2 /* Experimental feature */ +#define PNG_FILTER_HEURISTIC_LAST 3 /* Not a valid value */ + +/* Set the library compression level. Currently, valid values range from + * 0 - 9, corresponding directly to the zlib compression levels 0 - 9 + * (0 - no compression, 9 - "maximal" compression). Note that tests have + * shown that zlib compression levels 3-6 usually perform as well as level 9 + * for PNG images, and do considerably fewer caclulations. In the future, + * these values may not correspond directly to the zlib compression levels. + */ +PNG_EXPORT(69, void, png_set_compression_level, + (png_structp png_ptr, int level)); + +PNG_EXPORT(70, void, png_set_compression_mem_level, (png_structp png_ptr, + int mem_level)); + +PNG_EXPORT(71, void, png_set_compression_strategy, (png_structp png_ptr, + int strategy)); + +PNG_EXPORT(72, void, png_set_compression_window_bits, (png_structp png_ptr, + int window_bits)); + +PNG_EXPORT(73, void, png_set_compression_method, (png_structp png_ptr, + int method)); + +/* These next functions are called for input/output, memory, and error + * handling. They are in the file pngrio.c, pngwio.c, and pngerror.c, + * and call standard C I/O routines such as fread(), fwrite(), and + * fprintf(). These functions can be made to use other I/O routines + * at run time for those applications that need to handle I/O in a + * different manner by calling png_set_???_fn(). See libpng-manual.txt for + * more information. + */ + +#ifdef PNG_STDIO_SUPPORTED +/* Initialize the input/output for the PNG file to the default functions. */ +PNG_EXPORT(74, void, png_init_io, (png_structp png_ptr, png_FILE_p fp)); +#endif + +/* Replace the (error and abort), and warning functions with user + * supplied functions. If no messages are to be printed you must still + * write and use replacement functions. The replacement error_fn should + * still do a longjmp to the last setjmp location if you are using this + * method of error handling. If error_fn or warning_fn is NULL, the + * default function will be used. + */ + +PNG_EXPORT(75, void, png_set_error_fn, + (png_structp png_ptr, png_voidp error_ptr, + png_error_ptr error_fn, png_error_ptr warning_fn)); + +/* Return the user pointer associated with the error functions */ +PNG_EXPORT(76, png_voidp, png_get_error_ptr, (png_const_structp png_ptr)); + +/* Replace the default data output functions with a user supplied one(s). + * If buffered output is not used, then output_flush_fn can be set to NULL. + * If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time + * output_flush_fn will be ignored (and thus can be NULL). + * It is probably a mistake to use NULL for output_flush_fn if + * write_data_fn is not also NULL unless you have built libpng with + * PNG_WRITE_FLUSH_SUPPORTED undefined, because in this case libpng's + * default flush function, which uses the standard *FILE structure, will + * be used. + */ +PNG_EXPORT(77, void, png_set_write_fn, (png_structp png_ptr, png_voidp io_ptr, + png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn)); + +/* Replace the default data input function with a user supplied one. */ +PNG_EXPORT(78, void, png_set_read_fn, (png_structp png_ptr, png_voidp io_ptr, + png_rw_ptr read_data_fn)); + +/* Return the user pointer associated with the I/O functions */ +PNG_EXPORT(79, png_voidp, png_get_io_ptr, (png_structp png_ptr)); + +PNG_EXPORT(80, void, png_set_read_status_fn, (png_structp png_ptr, + png_read_status_ptr read_row_fn)); + +PNG_EXPORT(81, void, png_set_write_status_fn, (png_structp png_ptr, + png_write_status_ptr write_row_fn)); + +#ifdef PNG_USER_MEM_SUPPORTED +/* Replace the default memory allocation functions with user supplied one(s). */ +PNG_EXPORT(82, void, png_set_mem_fn, (png_structp png_ptr, png_voidp mem_ptr, + png_malloc_ptr malloc_fn, png_free_ptr free_fn)); +/* Return the user pointer associated with the memory functions */ +PNG_EXPORT(83, png_voidp, png_get_mem_ptr, (png_const_structp png_ptr)); +#endif + +#ifdef PNG_READ_USER_TRANSFORM_SUPPORTED +PNG_EXPORT(84, void, png_set_read_user_transform_fn, (png_structp png_ptr, + png_user_transform_ptr read_user_transform_fn)); +#endif + +#ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED +PNG_EXPORT(85, void, png_set_write_user_transform_fn, (png_structp png_ptr, + png_user_transform_ptr write_user_transform_fn)); +#endif + +#ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED +PNG_EXPORT(86, void, png_set_user_transform_info, (png_structp png_ptr, + png_voidp user_transform_ptr, int user_transform_depth, + int user_transform_channels)); +/* Return the user pointer associated with the user transform functions */ +PNG_EXPORT(87, png_voidp, png_get_user_transform_ptr, + (png_const_structp png_ptr)); +#endif + +#ifdef PNG_USER_TRANSFORM_INFO_SUPPORTED +/* Return information about the row currently being processed. Note that these + * APIs do not fail but will return unexpected results if called outside a user + * transform callback. Also note that when transforming an interlaced image the + * row number is still the row in the final, de-interlaced, image but the row + * only contains the data of the current pass - consult png_row_info for the + * actual width of the row! + */ +PNG_EXPORT(217, png_uint_32, png_get_current_row_number, (png_const_structp)); +PNG_EXPORT(218, png_byte, png_get_current_pass_number, (png_const_structp)); +#endif + +#ifdef PNG_USER_CHUNKS_SUPPORTED +PNG_EXPORT(88, void, png_set_read_user_chunk_fn, (png_structp png_ptr, + png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn)); +PNG_EXPORT(89, png_voidp, png_get_user_chunk_ptr, (png_const_structp png_ptr)); +#endif + +#ifdef PNG_PROGRESSIVE_READ_SUPPORTED +/* Sets the function callbacks for the push reader, and a pointer to a + * user-defined structure available to the callback functions. + */ +PNG_EXPORT(90, void, png_set_progressive_read_fn, (png_structp png_ptr, + png_voidp progressive_ptr, png_progressive_info_ptr info_fn, + png_progressive_row_ptr row_fn, png_progressive_end_ptr end_fn)); + +/* Returns the user pointer associated with the push read functions */ +PNG_EXPORT(91, png_voidp, png_get_progressive_ptr, (png_const_structp png_ptr)); + +/* Function to be called when data becomes available */ +PNG_EXPORT(92, void, png_process_data, + (png_structp png_ptr, png_infop info_ptr, + png_bytep buffer, png_size_t buffer_size)); + +/* A function which may be called *only* within png_process_data to stop the + * processing of any more data. The function returns the number of bytes + * remaining, excluding any that libpng has cached internally. A subsequent + * call to png_process_data must supply these bytes again. If the argument + * 'save' is set to true the routine will first save all the pending data and + * will always return 0. + */ +PNG_EXPORT(219, png_size_t, png_process_data_pause, (png_structp, int save)); + +/* A function which may be called *only* outside (after) a call to + * png_process_data. It returns the number of bytes of data to skip in the + * input. Normally it will return 0, but if it returns a non-zero value the + * application must skip than number of bytes of input data and pass the + * following data to the next call to png_process_data. + */ +PNG_EXPORT(220, png_uint_32, png_process_data_skip, (png_structp)); + +/* Function that combines rows. 'new_row' is a flag that should come from + * the callback and be non-NULL if anything needs to be done; the library + * stores its own version of the new data internally and ignores the passed + * in value. + */ +PNG_EXPORT(93, void, png_progressive_combine_row, (png_structp png_ptr, + png_bytep old_row, png_const_bytep new_row)); +#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ + +PNG_EXPORTA(94, png_voidp, png_malloc, + (png_structp png_ptr, png_alloc_size_t size), + PNG_ALLOCATED); +/* Added at libpng version 1.4.0 */ +PNG_EXPORTA(95, png_voidp, png_calloc, + (png_structp png_ptr, png_alloc_size_t size), + PNG_ALLOCATED); + +/* Added at libpng version 1.2.4 */ +PNG_EXPORTA(96, png_voidp, png_malloc_warn, (png_structp png_ptr, + png_alloc_size_t size), PNG_ALLOCATED); + +/* Frees a pointer allocated by png_malloc() */ +PNG_EXPORT(97, void, png_free, (png_structp png_ptr, png_voidp ptr)); + +/* Free data that was allocated internally */ +PNG_EXPORT(98, void, png_free_data, + (png_structp png_ptr, png_infop info_ptr, png_uint_32 free_me, int num)); + +/* Reassign responsibility for freeing existing data, whether allocated + * by libpng or by the application */ +PNG_EXPORT(99, void, png_data_freer, + (png_structp png_ptr, png_infop info_ptr, int freer, png_uint_32 mask)); + +/* Assignments for png_data_freer */ +#define PNG_DESTROY_WILL_FREE_DATA 1 +#define PNG_SET_WILL_FREE_DATA 1 +#define PNG_USER_WILL_FREE_DATA 2 +/* Flags for png_ptr->free_me and info_ptr->free_me */ +#define PNG_FREE_HIST 0x0008 +#define PNG_FREE_ICCP 0x0010 +#define PNG_FREE_SPLT 0x0020 +#define PNG_FREE_ROWS 0x0040 +#define PNG_FREE_PCAL 0x0080 +#define PNG_FREE_SCAL 0x0100 +#define PNG_FREE_UNKN 0x0200 +#define PNG_FREE_LIST 0x0400 +#define PNG_FREE_PLTE 0x1000 +#define PNG_FREE_TRNS 0x2000 +#define PNG_FREE_TEXT 0x4000 +#define PNG_FREE_ALL 0x7fff +#define PNG_FREE_MUL 0x4220 /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */ + +#ifdef PNG_USER_MEM_SUPPORTED +PNG_EXPORTA(100, png_voidp, png_malloc_default, (png_structp png_ptr, + png_alloc_size_t size), PNG_ALLOCATED); +PNG_EXPORT(101, void, png_free_default, (png_structp png_ptr, png_voidp ptr)); +#endif + +#ifdef PNG_ERROR_TEXT_SUPPORTED +/* Fatal error in PNG image of libpng - can't continue */ +PNG_EXPORTA(102, void, png_error, + (png_structp png_ptr, png_const_charp error_message), + PNG_NORETURN); + +/* The same, but the chunk name is prepended to the error string. */ +PNG_EXPORTA(103, void, png_chunk_error, (png_structp png_ptr, + png_const_charp error_message), PNG_NORETURN); + +#else +/* Fatal error in PNG image of libpng - can't continue */ +PNG_EXPORTA(104, void, png_err, (png_structp png_ptr), PNG_NORETURN); +#endif + +/* Non-fatal error in libpng. Can continue, but may have a problem. */ +PNG_EXPORT(105, void, png_warning, (png_structp png_ptr, + png_const_charp warning_message)); + +/* Non-fatal error in libpng, chunk name is prepended to message. */ +PNG_EXPORT(106, void, png_chunk_warning, (png_structp png_ptr, + png_const_charp warning_message)); + +#ifdef PNG_BENIGN_ERRORS_SUPPORTED +/* Benign error in libpng. Can continue, but may have a problem. + * User can choose whether to handle as a fatal error or as a warning. */ +# undef png_benign_error +PNG_EXPORT(107, void, png_benign_error, (png_structp png_ptr, + png_const_charp warning_message)); + +/* Same, chunk name is prepended to message. */ +# undef png_chunk_benign_error +PNG_EXPORT(108, void, png_chunk_benign_error, (png_structp png_ptr, + png_const_charp warning_message)); + +PNG_EXPORT(109, void, png_set_benign_errors, + (png_structp png_ptr, int allowed)); +#else +# ifdef PNG_ALLOW_BENIGN_ERRORS +# define png_benign_error png_warning +# define png_chunk_benign_error png_chunk_warning +# else +# define png_benign_error png_error +# define png_chunk_benign_error png_chunk_error +# endif +#endif + +/* The png_set_ functions are for storing values in the png_info_struct. + * Similarly, the png_get_ calls are used to read values from the + * png_info_struct, either storing the parameters in the passed variables, or + * setting pointers into the png_info_struct where the data is stored. The + * png_get_ functions return a non-zero value if the data was available + * in info_ptr, or return zero and do not change any of the parameters if the + * data was not available. + * + * These functions should be used instead of directly accessing png_info + * to avoid problems with future changes in the size and internal layout of + * png_info_struct. + */ +/* Returns "flag" if chunk data is valid in info_ptr. */ +PNG_EXPORT(110, png_uint_32, png_get_valid, + (png_const_structp png_ptr, png_const_infop info_ptr, + png_uint_32 flag)); + +/* Returns number of bytes needed to hold a transformed row. */ +PNG_EXPORT(111, png_size_t, png_get_rowbytes, (png_const_structp png_ptr, + png_const_infop info_ptr)); + +#ifdef PNG_INFO_IMAGE_SUPPORTED +/* Returns row_pointers, which is an array of pointers to scanlines that was + * returned from png_read_png(). + */ +PNG_EXPORT(112, png_bytepp, png_get_rows, + (png_const_structp png_ptr, png_const_infop info_ptr)); +/* Set row_pointers, which is an array of pointers to scanlines for use + * by png_write_png(). + */ +PNG_EXPORT(113, void, png_set_rows, (png_structp png_ptr, + png_infop info_ptr, png_bytepp row_pointers)); +#endif + +/* Returns number of color channels in image. */ +PNG_EXPORT(114, png_byte, png_get_channels, + (png_const_structp png_ptr, png_const_infop info_ptr)); + +#ifdef PNG_EASY_ACCESS_SUPPORTED +/* Returns image width in pixels. */ +PNG_EXPORT(115, png_uint_32, png_get_image_width, (png_const_structp png_ptr, + png_const_infop info_ptr)); + +/* Returns image height in pixels. */ +PNG_EXPORT(116, png_uint_32, png_get_image_height, (png_const_structp png_ptr, + png_const_infop info_ptr)); + +/* Returns image bit_depth. */ +PNG_EXPORT(117, png_byte, png_get_bit_depth, + (png_const_structp png_ptr, png_const_infop info_ptr)); + +/* Returns image color_type. */ +PNG_EXPORT(118, png_byte, png_get_color_type, (png_const_structp png_ptr, + png_const_infop info_ptr)); + +/* Returns image filter_type. */ +PNG_EXPORT(119, png_byte, png_get_filter_type, (png_const_structp png_ptr, + png_const_infop info_ptr)); + +/* Returns image interlace_type. */ +PNG_EXPORT(120, png_byte, png_get_interlace_type, (png_const_structp png_ptr, + png_const_infop info_ptr)); + +/* Returns image compression_type. */ +PNG_EXPORT(121, png_byte, png_get_compression_type, (png_const_structp png_ptr, + png_const_infop info_ptr)); + +/* Returns image resolution in pixels per meter, from pHYs chunk data. */ +PNG_EXPORT(122, png_uint_32, png_get_pixels_per_meter, + (png_const_structp png_ptr, png_const_infop info_ptr)); +PNG_EXPORT(123, png_uint_32, png_get_x_pixels_per_meter, + (png_const_structp png_ptr, png_const_infop info_ptr)); +PNG_EXPORT(124, png_uint_32, png_get_y_pixels_per_meter, + (png_const_structp png_ptr, png_const_infop info_ptr)); + +/* Returns pixel aspect ratio, computed from pHYs chunk data. */ +PNG_FP_EXPORT(125, float, png_get_pixel_aspect_ratio, + (png_const_structp png_ptr, png_const_infop info_ptr)); +PNG_FIXED_EXPORT(210, png_fixed_point, png_get_pixel_aspect_ratio_fixed, + (png_const_structp png_ptr, png_const_infop info_ptr)); + +/* Returns image x, y offset in pixels or microns, from oFFs chunk data. */ +PNG_EXPORT(126, png_int_32, png_get_x_offset_pixels, + (png_const_structp png_ptr, png_const_infop info_ptr)); +PNG_EXPORT(127, png_int_32, png_get_y_offset_pixels, + (png_const_structp png_ptr, png_const_infop info_ptr)); +PNG_EXPORT(128, png_int_32, png_get_x_offset_microns, + (png_const_structp png_ptr, png_const_infop info_ptr)); +PNG_EXPORT(129, png_int_32, png_get_y_offset_microns, + (png_const_structp png_ptr, png_const_infop info_ptr)); + +#endif /* PNG_EASY_ACCESS_SUPPORTED */ + +/* Returns pointer to signature string read from PNG header */ +PNG_EXPORT(130, png_const_bytep, png_get_signature, + (png_const_structp png_ptr, png_infop info_ptr)); + +#ifdef PNG_bKGD_SUPPORTED +PNG_EXPORT(131, png_uint_32, png_get_bKGD, + (png_const_structp png_ptr, png_infop info_ptr, + png_color_16p *background)); +#endif + +#ifdef PNG_bKGD_SUPPORTED +PNG_EXPORT(132, void, png_set_bKGD, (png_structp png_ptr, png_infop info_ptr, + png_const_color_16p background)); +#endif + +#ifdef PNG_cHRM_SUPPORTED +PNG_FP_EXPORT(133, png_uint_32, png_get_cHRM, (png_const_structp png_ptr, + png_const_infop info_ptr, double *white_x, double *white_y, double *red_x, + double *red_y, double *green_x, double *green_y, double *blue_x, + double *blue_y)); +#ifdef PNG_FIXED_POINT_SUPPORTED /* Otherwise not implemented */ +PNG_FIXED_EXPORT(134, png_uint_32, png_get_cHRM_fixed, + (png_const_structp png_ptr, + png_const_infop info_ptr, png_fixed_point *int_white_x, + png_fixed_point *int_white_y, png_fixed_point *int_red_x, + png_fixed_point *int_red_y, png_fixed_point *int_green_x, + png_fixed_point *int_green_y, png_fixed_point *int_blue_x, + png_fixed_point *int_blue_y)); +#endif +#endif + +#ifdef PNG_cHRM_SUPPORTED +PNG_FP_EXPORT(135, void, png_set_cHRM, + (png_structp png_ptr, png_infop info_ptr, + double white_x, double white_y, double red_x, double red_y, double green_x, + double green_y, double blue_x, double blue_y)); +PNG_FIXED_EXPORT(136, void, png_set_cHRM_fixed, (png_structp png_ptr, + png_infop info_ptr, png_fixed_point int_white_x, + png_fixed_point int_white_y, png_fixed_point int_red_x, + png_fixed_point int_red_y, png_fixed_point int_green_x, + png_fixed_point int_green_y, png_fixed_point int_blue_x, + png_fixed_point int_blue_y)); +#endif + +#ifdef PNG_gAMA_SUPPORTED +PNG_FP_EXPORT(137, png_uint_32, png_get_gAMA, + (png_const_structp png_ptr, png_const_infop info_ptr, + double *file_gamma)); +PNG_FIXED_EXPORT(138, png_uint_32, png_get_gAMA_fixed, + (png_const_structp png_ptr, png_const_infop info_ptr, + png_fixed_point *int_file_gamma)); +#endif + +#ifdef PNG_gAMA_SUPPORTED +PNG_FP_EXPORT(139, void, png_set_gAMA, (png_structp png_ptr, + png_infop info_ptr, double file_gamma)); +PNG_FIXED_EXPORT(140, void, png_set_gAMA_fixed, (png_structp png_ptr, + png_infop info_ptr, png_fixed_point int_file_gamma)); +#endif + +#ifdef PNG_hIST_SUPPORTED +PNG_EXPORT(141, png_uint_32, png_get_hIST, + (png_const_structp png_ptr, png_const_infop info_ptr, + png_uint_16p *hist)); +#endif + +#ifdef PNG_hIST_SUPPORTED +PNG_EXPORT(142, void, png_set_hIST, (png_structp png_ptr, + png_infop info_ptr, png_const_uint_16p hist)); +#endif + +PNG_EXPORT(143, png_uint_32, png_get_IHDR, + (png_structp png_ptr, png_infop info_ptr, + png_uint_32 *width, png_uint_32 *height, int *bit_depth, int *color_type, + int *interlace_method, int *compression_method, int *filter_method)); + +PNG_EXPORT(144, void, png_set_IHDR, + (png_structp png_ptr, png_infop info_ptr, + png_uint_32 width, png_uint_32 height, int bit_depth, int color_type, + int interlace_method, int compression_method, int filter_method)); + +#ifdef PNG_oFFs_SUPPORTED +PNG_EXPORT(145, png_uint_32, png_get_oFFs, + (png_const_structp png_ptr, png_const_infop info_ptr, + png_int_32 *offset_x, png_int_32 *offset_y, int *unit_type)); +#endif + +#ifdef PNG_oFFs_SUPPORTED +PNG_EXPORT(146, void, png_set_oFFs, + (png_structp png_ptr, png_infop info_ptr, + png_int_32 offset_x, png_int_32 offset_y, int unit_type)); +#endif + +#ifdef PNG_pCAL_SUPPORTED +PNG_EXPORT(147, png_uint_32, png_get_pCAL, + (png_const_structp png_ptr, png_const_infop info_ptr, + png_charp *purpose, png_int_32 *X0, png_int_32 *X1, int *type, + int *nparams, + png_charp *units, png_charpp *params)); +#endif + +#ifdef PNG_pCAL_SUPPORTED +PNG_EXPORT(148, void, png_set_pCAL, (png_structp png_ptr, + png_infop info_ptr, + png_const_charp purpose, png_int_32 X0, png_int_32 X1, int type, + int nparams, png_const_charp units, png_charpp params)); +#endif + +#ifdef PNG_pHYs_SUPPORTED +PNG_EXPORT(149, png_uint_32, png_get_pHYs, + (png_const_structp png_ptr, png_const_infop info_ptr, + png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)); +#endif + +#ifdef PNG_pHYs_SUPPORTED +PNG_EXPORT(150, void, png_set_pHYs, + (png_structp png_ptr, png_infop info_ptr, + png_uint_32 res_x, png_uint_32 res_y, int unit_type)); +#endif + +PNG_EXPORT(151, png_uint_32, png_get_PLTE, + (png_const_structp png_ptr, png_const_infop info_ptr, + png_colorp *palette, int *num_palette)); + +PNG_EXPORT(152, void, png_set_PLTE, + (png_structp png_ptr, png_infop info_ptr, + png_const_colorp palette, int num_palette)); + +#ifdef PNG_sBIT_SUPPORTED +PNG_EXPORT(153, png_uint_32, png_get_sBIT, + (png_const_structp png_ptr, png_infop info_ptr, + png_color_8p *sig_bit)); +#endif + +#ifdef PNG_sBIT_SUPPORTED +PNG_EXPORT(154, void, png_set_sBIT, + (png_structp png_ptr, png_infop info_ptr, png_const_color_8p sig_bit)); +#endif + +#ifdef PNG_sRGB_SUPPORTED +PNG_EXPORT(155, png_uint_32, png_get_sRGB, (png_const_structp png_ptr, + png_const_infop info_ptr, int *file_srgb_intent)); +#endif + +#ifdef PNG_sRGB_SUPPORTED +PNG_EXPORT(156, void, png_set_sRGB, + (png_structp png_ptr, png_infop info_ptr, int srgb_intent)); +PNG_EXPORT(157, void, png_set_sRGB_gAMA_and_cHRM, (png_structp png_ptr, + png_infop info_ptr, int srgb_intent)); +#endif + +#ifdef PNG_iCCP_SUPPORTED +PNG_EXPORT(158, png_uint_32, png_get_iCCP, + (png_const_structp png_ptr, png_const_infop info_ptr, + png_charpp name, int *compression_type, png_bytepp profile, + png_uint_32 *proflen)); +#endif + +#ifdef PNG_iCCP_SUPPORTED +PNG_EXPORT(159, void, png_set_iCCP, + (png_structp png_ptr, png_infop info_ptr, + png_const_charp name, int compression_type, png_const_bytep profile, + png_uint_32 proflen)); +#endif + +#ifdef PNG_sPLT_SUPPORTED +PNG_EXPORT(160, png_uint_32, png_get_sPLT, + (png_const_structp png_ptr, png_const_infop info_ptr, + png_sPLT_tpp entries)); +#endif + +#ifdef PNG_sPLT_SUPPORTED +PNG_EXPORT(161, void, png_set_sPLT, + (png_structp png_ptr, png_infop info_ptr, + png_const_sPLT_tp entries, int nentries)); +#endif + +#ifdef PNG_TEXT_SUPPORTED +/* png_get_text also returns the number of text chunks in *num_text */ +PNG_EXPORT(162, png_uint_32, png_get_text, + (png_const_structp png_ptr, png_const_infop info_ptr, + png_textp *text_ptr, int *num_text)); +#endif + +/* Note while png_set_text() will accept a structure whose text, + * language, and translated keywords are NULL pointers, the structure + * returned by png_get_text will always contain regular + * zero-terminated C strings. They might be empty strings but + * they will never be NULL pointers. + */ + +#ifdef PNG_TEXT_SUPPORTED +PNG_EXPORT(163, void, png_set_text, + (png_structp png_ptr, png_infop info_ptr, + png_const_textp text_ptr, int num_text)); +#endif + +#ifdef PNG_tIME_SUPPORTED +PNG_EXPORT(164, png_uint_32, png_get_tIME, + (png_const_structp png_ptr, png_infop info_ptr, png_timep *mod_time)); +#endif + +#ifdef PNG_tIME_SUPPORTED +PNG_EXPORT(165, void, png_set_tIME, + (png_structp png_ptr, png_infop info_ptr, png_const_timep mod_time)); +#endif + +#ifdef PNG_tRNS_SUPPORTED +PNG_EXPORT(166, png_uint_32, png_get_tRNS, + (png_const_structp png_ptr, png_infop info_ptr, + png_bytep *trans_alpha, int *num_trans, png_color_16p *trans_color)); +#endif + +#ifdef PNG_tRNS_SUPPORTED +PNG_EXPORT(167, void, png_set_tRNS, + (png_structp png_ptr, png_infop info_ptr, + png_const_bytep trans_alpha, int num_trans, + png_const_color_16p trans_color)); +#endif + +#ifdef PNG_sCAL_SUPPORTED +PNG_FP_EXPORT(168, png_uint_32, png_get_sCAL, + (png_const_structp png_ptr, png_const_infop info_ptr, + int *unit, double *width, double *height)); +#ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED +/* NOTE: this API is currently implemented using floating point arithmetic, + * consequently it can only be used on systems with floating point support. + * In any case the range of values supported by png_fixed_point is small and it + * is highly recommended that png_get_sCAL_s be used instead. + */ +PNG_FIXED_EXPORT(214, png_uint_32, png_get_sCAL_fixed, + (png_structp png_ptr, png_const_infop info_ptr, int *unit, + png_fixed_point *width, + png_fixed_point *height)); +#endif +PNG_EXPORT(169, png_uint_32, png_get_sCAL_s, + (png_const_structp png_ptr, png_const_infop info_ptr, + int *unit, png_charpp swidth, png_charpp sheight)); + +PNG_FP_EXPORT(170, void, png_set_sCAL, + (png_structp png_ptr, png_infop info_ptr, + int unit, double width, double height)); +PNG_FIXED_EXPORT(213, void, png_set_sCAL_fixed, (png_structp png_ptr, + png_infop info_ptr, int unit, png_fixed_point width, + png_fixed_point height)); +PNG_EXPORT(171, void, png_set_sCAL_s, + (png_structp png_ptr, png_infop info_ptr, + int unit, png_const_charp swidth, png_const_charp sheight)); +#endif /* PNG_sCAL_SUPPORTED */ + +#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED +/* Provide a list of chunks and how they are to be handled, if the built-in + handling or default unknown chunk handling is not desired. Any chunks not + listed will be handled in the default manner. The IHDR and IEND chunks + must not be listed. + keep = 0: follow default behaviour + = 1: do not keep + = 2: keep only if safe-to-copy + = 3: keep even if unsafe-to-copy +*/ +PNG_EXPORT(172, void, png_set_keep_unknown_chunks, + (png_structp png_ptr, int keep, + png_const_bytep chunk_list, int num_chunks)); +PNG_EXPORT(173, int, png_handle_as_unknown, (png_structp png_ptr, + png_const_bytep chunk_name)); +#endif +#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED +PNG_EXPORT(174, void, png_set_unknown_chunks, (png_structp png_ptr, + png_infop info_ptr, png_const_unknown_chunkp unknowns, + int num_unknowns)); +PNG_EXPORT(175, void, png_set_unknown_chunk_location, + (png_structp png_ptr, png_infop info_ptr, int chunk, int location)); +PNG_EXPORT(176, int, png_get_unknown_chunks, (png_const_structp png_ptr, + png_const_infop info_ptr, png_unknown_chunkpp entries)); +#endif + +/* Png_free_data() will turn off the "valid" flag for anything it frees. + * If you need to turn it off for a chunk that your application has freed, + * you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK); + */ +PNG_EXPORT(177, void, png_set_invalid, + (png_structp png_ptr, png_infop info_ptr, int mask)); + +#ifdef PNG_INFO_IMAGE_SUPPORTED +/* The "params" pointer is currently not used and is for future expansion. */ +PNG_EXPORT(178, void, png_read_png, (png_structp png_ptr, png_infop info_ptr, + int transforms, png_voidp params)); +PNG_EXPORT(179, void, png_write_png, (png_structp png_ptr, png_infop info_ptr, + int transforms, png_voidp params)); +#endif + +PNG_EXPORT(180, png_const_charp, png_get_copyright, + (png_const_structp png_ptr)); +PNG_EXPORT(181, png_const_charp, png_get_header_ver, + (png_const_structp png_ptr)); +PNG_EXPORT(182, png_const_charp, png_get_header_version, + (png_const_structp png_ptr)); +PNG_EXPORT(183, png_const_charp, png_get_libpng_ver, + (png_const_structp png_ptr)); + +#ifdef PNG_MNG_FEATURES_SUPPORTED +PNG_EXPORT(184, png_uint_32, png_permit_mng_features, (png_structp png_ptr, + png_uint_32 mng_features_permitted)); +#endif + +/* For use in png_set_keep_unknown, added to version 1.2.6 */ +#define PNG_HANDLE_CHUNK_AS_DEFAULT 0 +#define PNG_HANDLE_CHUNK_NEVER 1 +#define PNG_HANDLE_CHUNK_IF_SAFE 2 +#define PNG_HANDLE_CHUNK_ALWAYS 3 + +/* Strip the prepended error numbers ("#nnn ") from error and warning + * messages before passing them to the error or warning handler. + */ +#ifdef PNG_ERROR_NUMBERS_SUPPORTED +PNG_EXPORT(185, void, png_set_strip_error_numbers, + (png_structp png_ptr, + png_uint_32 strip_mode)); +#endif + +/* Added in libpng-1.2.6 */ +#ifdef PNG_SET_USER_LIMITS_SUPPORTED +PNG_EXPORT(186, void, png_set_user_limits, (png_structp png_ptr, + png_uint_32 user_width_max, png_uint_32 user_height_max)); +PNG_EXPORT(187, png_uint_32, png_get_user_width_max, + (png_const_structp png_ptr)); +PNG_EXPORT(188, png_uint_32, png_get_user_height_max, + (png_const_structp png_ptr)); +/* Added in libpng-1.4.0 */ +PNG_EXPORT(189, void, png_set_chunk_cache_max, (png_structp png_ptr, + png_uint_32 user_chunk_cache_max)); +PNG_EXPORT(190, png_uint_32, png_get_chunk_cache_max, + (png_const_structp png_ptr)); +/* Added in libpng-1.4.1 */ +PNG_EXPORT(191, void, png_set_chunk_malloc_max, (png_structp png_ptr, + png_alloc_size_t user_chunk_cache_max)); +PNG_EXPORT(192, png_alloc_size_t, png_get_chunk_malloc_max, + (png_const_structp png_ptr)); +#endif + +#if defined(PNG_INCH_CONVERSIONS_SUPPORTED) +PNG_EXPORT(193, png_uint_32, png_get_pixels_per_inch, + (png_const_structp png_ptr, png_const_infop info_ptr)); + +PNG_EXPORT(194, png_uint_32, png_get_x_pixels_per_inch, + (png_const_structp png_ptr, png_const_infop info_ptr)); + +PNG_EXPORT(195, png_uint_32, png_get_y_pixels_per_inch, + (png_const_structp png_ptr, png_const_infop info_ptr)); + +PNG_FP_EXPORT(196, float, png_get_x_offset_inches, + (png_const_structp png_ptr, png_const_infop info_ptr)); +#ifdef PNG_FIXED_POINT_SUPPORTED /* otherwise not implemented. */ +PNG_FIXED_EXPORT(211, png_fixed_point, png_get_x_offset_inches_fixed, + (png_structp png_ptr, png_const_infop info_ptr)); +#endif + +PNG_FP_EXPORT(197, float, png_get_y_offset_inches, (png_const_structp png_ptr, + png_const_infop info_ptr)); +#ifdef PNG_FIXED_POINT_SUPPORTED /* otherwise not implemented. */ +PNG_FIXED_EXPORT(212, png_fixed_point, png_get_y_offset_inches_fixed, + (png_structp png_ptr, png_const_infop info_ptr)); +#endif + +# ifdef PNG_pHYs_SUPPORTED +PNG_EXPORT(198, png_uint_32, png_get_pHYs_dpi, (png_const_structp png_ptr, + png_const_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, + int *unit_type)); +# endif /* PNG_pHYs_SUPPORTED */ +#endif /* PNG_INCH_CONVERSIONS_SUPPORTED */ + +/* Added in libpng-1.4.0 */ +#ifdef PNG_IO_STATE_SUPPORTED +PNG_EXPORT(199, png_uint_32, png_get_io_state, (png_structp png_ptr)); + +PNG_EXPORTA(200, png_const_bytep, png_get_io_chunk_name, + (png_structp png_ptr), PNG_DEPRECATED); +PNG_EXPORT(216, png_uint_32, png_get_io_chunk_type, + (png_const_structp png_ptr)); + +/* The flags returned by png_get_io_state() are the following: */ +# define PNG_IO_NONE 0x0000 /* no I/O at this moment */ +# define PNG_IO_READING 0x0001 /* currently reading */ +# define PNG_IO_WRITING 0x0002 /* currently writing */ +# define PNG_IO_SIGNATURE 0x0010 /* currently at the file signature */ +# define PNG_IO_CHUNK_HDR 0x0020 /* currently at the chunk header */ +# define PNG_IO_CHUNK_DATA 0x0040 /* currently at the chunk data */ +# define PNG_IO_CHUNK_CRC 0x0080 /* currently at the chunk crc */ +# define PNG_IO_MASK_OP 0x000f /* current operation: reading/writing */ +# define PNG_IO_MASK_LOC 0x00f0 /* current location: sig/hdr/data/crc */ +#endif /* ?PNG_IO_STATE_SUPPORTED */ + +/* Interlace support. The following macros are always defined so that if + * libpng interlace handling is turned off the macros may be used to handle + * interlaced images within the application. + */ +#define PNG_INTERLACE_ADAM7_PASSES 7 + +/* Two macros to return the first row and first column of the original, + * full, image which appears in a given pass. 'pass' is in the range 0 + * to 6 and the result is in the range 0 to 7. + */ +#define PNG_PASS_START_ROW(pass) (((1U&~(pass))<<(3-((pass)>>1)))&7) +#define PNG_PASS_START_COL(pass) (((1U& (pass))<<(3-(((pass)+1)>>1)))&7) + +/* Two macros to help evaluate the number of rows or columns in each + * pass. This is expressed as a shift - effectively log2 of the number or + * rows or columns in each 8x8 tile of the original image. + */ +#define PNG_PASS_ROW_SHIFT(pass) ((pass)>2?(8-(pass))>>1:3) +#define PNG_PASS_COL_SHIFT(pass) ((pass)>1?(7-(pass))>>1:3) + +/* Hence two macros to determine the number of rows or columns in a given + * pass of an image given its height or width. In fact these macros may + * return non-zero even though the sub-image is empty, because the other + * dimension may be empty for a small image. + */ +#define PNG_PASS_ROWS(height, pass) (((height)+(((1<>PNG_PASS_ROW_SHIFT(pass)) +#define PNG_PASS_COLS(width, pass) (((width)+(((1<>PNG_PASS_COL_SHIFT(pass)) + +/* For the progressive reader it is necessary to find the row in the output + * image given a row in an interlaced image, so two more macros: + */ +#define PNG_ROW_FROM_PASS_ROW(yIn, pass) \ + (((yIn)<>(((7-(off))-(pass))<<2)) & 0xFU) | \ + ((0x01145AF0U>>(((7-(off))-(pass))<<2)) & 0xF0U)) + +#define PNG_ROW_IN_INTERLACE_PASS(y, pass) \ + ((PNG_PASS_MASK(pass,0) >> ((y)&7)) & 1) +#define PNG_COL_IN_INTERLACE_PASS(x, pass) \ + ((PNG_PASS_MASK(pass,1) >> ((x)&7)) & 1) + +#ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED +/* With these routines we avoid an integer divide, which will be slower on + * most machines. However, it does take more operations than the corresponding + * divide method, so it may be slower on a few RISC systems. There are two + * shifts (by 8 or 16 bits) and an addition, versus a single integer divide. + * + * Note that the rounding factors are NOT supposed to be the same! 128 and + * 32768 are correct for the NODIV code; 127 and 32767 are correct for the + * standard method. + * + * [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ] + */ + + /* fg and bg should be in `gamma 1.0' space; alpha is the opacity */ + +# define png_composite(composite, fg, alpha, bg) \ + { png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) \ + * (png_uint_16)(alpha) \ + + (png_uint_16)(bg)*(png_uint_16)(255 \ + - (png_uint_16)(alpha)) + (png_uint_16)128); \ + (composite) = (png_byte)((temp + (temp >> 8)) >> 8); } + +# define png_composite_16(composite, fg, alpha, bg) \ + { png_uint_32 temp = (png_uint_32)((png_uint_32)(fg) \ + * (png_uint_32)(alpha) \ + + (png_uint_32)(bg)*(png_uint_32)(65535L \ + - (png_uint_32)(alpha)) + (png_uint_32)32768L); \ + (composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); } + +#else /* Standard method using integer division */ + +# define png_composite(composite, fg, alpha, bg) \ + (composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) + \ + (png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \ + (png_uint_16)127) / 255) + +# define png_composite_16(composite, fg, alpha, bg) \ + (composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \ + (png_uint_32)(bg)*(png_uint_32)(65535L - (png_uint_32)(alpha)) + \ + (png_uint_32)32767) / (png_uint_32)65535L) +#endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */ + +#ifdef PNG_READ_INT_FUNCTIONS_SUPPORTED +PNG_EXPORT(201, png_uint_32, png_get_uint_32, (png_const_bytep buf)); +PNG_EXPORT(202, png_uint_16, png_get_uint_16, (png_const_bytep buf)); +PNG_EXPORT(203, png_int_32, png_get_int_32, (png_const_bytep buf)); +#endif + +PNG_EXPORT(204, png_uint_32, png_get_uint_31, (png_structp png_ptr, + png_const_bytep buf)); +/* No png_get_int_16 -- may be added if there's a real need for it. */ + +/* Place a 32-bit number into a buffer in PNG byte order (big-endian). */ +#ifdef PNG_WRITE_INT_FUNCTIONS_SUPPORTED +PNG_EXPORT(205, void, png_save_uint_32, (png_bytep buf, png_uint_32 i)); +#endif +#ifdef PNG_SAVE_INT_32_SUPPORTED +PNG_EXPORT(206, void, png_save_int_32, (png_bytep buf, png_int_32 i)); +#endif + +/* Place a 16-bit number into a buffer in PNG byte order. + * The parameter is declared unsigned int, not png_uint_16, + * just to avoid potential problems on pre-ANSI C compilers. + */ +#ifdef PNG_WRITE_INT_FUNCTIONS_SUPPORTED +PNG_EXPORT(207, void, png_save_uint_16, (png_bytep buf, unsigned int i)); +/* No png_save_int_16 -- may be added if there's a real need for it. */ +#endif + +#ifdef PNG_USE_READ_MACROS +/* Inline macros to do direct reads of bytes from the input buffer. + * The png_get_int_32() routine assumes we are using two's complement + * format for negative values, which is almost certainly true. + */ +# define png_get_uint_32(buf) \ + (((png_uint_32)(*(buf)) << 24) + \ + ((png_uint_32)(*((buf) + 1)) << 16) + \ + ((png_uint_32)(*((buf) + 2)) << 8) + \ + ((png_uint_32)(*((buf) + 3)))) + + /* From libpng-1.4.0 until 1.4.4, the png_get_uint_16 macro (but not the + * function) incorrectly returned a value of type png_uint_32. + */ +# define png_get_uint_16(buf) \ + ((png_uint_16) \ + (((unsigned int)(*(buf)) << 8) + \ + ((unsigned int)(*((buf) + 1))))) + +# define png_get_int_32(buf) \ + ((png_int_32)((*(buf) & 0x80) \ + ? -((png_int_32)((png_get_uint_32(buf) ^ 0xffffffffL) + 1)) \ + : (png_int_32)png_get_uint_32(buf))) +#endif + +/* Maintainer: Put new public prototypes here ^, in libpng.3, and project + * defs + */ + +/* The last ordinal number (this is the *last* one already used; the next + * one to use is one more than this.) Maintainer, remember to add an entry to + * scripts/symbols.def as well. + */ +#ifdef PNG_EXPORT_LAST_ORDINAL + PNG_EXPORT_LAST_ORDINAL(220); +#endif + +#ifdef __cplusplus +} +#endif + +#endif /* PNG_VERSION_INFO_ONLY */ +/* Do not put anything past this line */ +#endif /* PNG_H */ diff --git a/programs/develop/libraries/libpng/pngconf.h b/programs/develop/libraries/libpng/pngconf.h new file mode 100644 index 0000000000..2633bf890c --- /dev/null +++ b/programs/develop/libraries/libpng/pngconf.h @@ -0,0 +1,632 @@ + +/* pngconf.h - machine configurable file for libpng + * + * libpng version 1.5.1 - February 3, 2011 + * + * Copyright (c) 1998-2011 Glenn Randers-Pehrson + * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) + * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) + * + * This code is released under the libpng license. + * For conditions of distribution and use, see the disclaimer + * and license in png.h + * + */ + +/* Any machine specific code is near the front of this file, so if you + * are configuring libpng for a machine, you may want to read the section + * starting here down to where it starts to typedef png_color, png_text, + * and png_info. + */ + +#ifndef PNGCONF_H +#define PNGCONF_H + +/* PNG_NO_LIMITS_H may be used to turn off the use of the standard C + * definition file for machine specific limits, this may impact the + * correctness of the definitons below (see uses of INT_MAX). + */ +#ifndef PNG_NO_LIMITS_H +# include +#endif + +/* For the memory copy APIs (i.e. the standard definitions of these), + * because this file defines png_memcpy and so on the base APIs must + * be defined here. + */ +#ifdef BSD +# include +#else +# include +#endif + +/* For png_FILE_p - this provides the standard definition of a + * FILE + */ +#ifdef PNG_STDIO_SUPPORTED +# include +#endif + +/* This controls optimization of the reading of 16 and 32 bit values + * from PNG files. It can be set on a per-app-file basis - it + * just changes whether a macro is used to the function is called. + * The library builder sets the default, if read functions are not + * built into the library the macro implementation is forced on. + */ +#ifndef PNG_READ_INT_FUNCTIONS_SUPPORTED +# define PNG_USE_READ_MACROS +#endif +#if !defined(PNG_NO_USE_READ_MACROS) && !defined(PNG_USE_READ_MACROS) +# if PNG_DEFAULT_READ_MACROS +# define PNG_USE_READ_MACROS +# endif +#endif + +/* COMPILER SPECIFIC OPTIONS. + * + * These options are provided so that a variety of difficult compilers + * can be used. Some are fixed at build time (e.g. PNG_API_RULE + * below) but still have compiler specific implementations, others + * may be changed on a per-file basis when compiling against libpng. + */ + +/* The PNGARG macro protects us against machines that don't have function + * prototypes (ie K&R style headers). If your compiler does not handle + * function prototypes, define this macro and use the included ansi2knr. + * I've always been able to use _NO_PROTO as the indicator, but you may + * need to drag the empty declaration out in front of here, or change the + * ifdef to suit your own needs. + */ +#ifndef PNGARG + +# ifdef OF /* zlib prototype munger */ +# define PNGARG(arglist) OF(arglist) +# else + +# ifdef _NO_PROTO +# define PNGARG(arglist) () +# else +# define PNGARG(arglist) arglist +# endif /* _NO_PROTO */ + +# endif /* OF */ + +#endif /* PNGARG */ + +/* Function calling conventions. + * ============================= + * Normally it is not necessary to specify to the compiler how to call + * a function - it just does it - however on x86 systems derived from + * Microsoft and Borland C compilers ('IBM PC', 'DOS', 'Windows' systems + * and some others) there are multiple ways to call a function and the + * default can be changed on the compiler command line. For this reason + * libpng specifies the calling convention of every exported function and + * every function called via a user supplied function pointer. This is + * done in this file by defining the following macros: + * + * PNGAPI Calling convention for exported functions. + * PNGCBAPI Calling convention for user provided (callback) functions. + * PNGCAPI Calling convention used by the ANSI-C library (required + * for longjmp callbacks and sometimes used internally to + * specify the calling convention for zlib). + * + * These macros should never be overridden. If it is necessary to + * change calling convention in a private build this can be done + * by setting PNG_API_RULE (which defaults to 0) to one of the values + * below to select the correct 'API' variants. + * + * PNG_API_RULE=0 Use PNGCAPI - the 'C' calling convention - throughout. + * This is correct in every known environment. + * PNG_API_RULE=1 Use the operating system convention for PNGAPI and + * the 'C' calling convention (from PNGCAPI) for + * callbacks (PNGCBAPI). This is no longer required + * in any known environment - if it has to be used + * please post an explanation of the problem to the + * libpng mailing list. + * + * These cases only differ if the operating system does not use the C + * calling convention, at present this just means the above cases + * (x86 DOS/Windows sytems) and, even then, this does not apply to + * Cygwin running on those systems. + * + * Note that the value must be defined in pnglibconf.h so that what + * the application uses to call the library matches the conventions + * set when building the library. + */ + +/* Symbol export + * ============= + * When building a shared library it is almost always necessary to tell + * the compiler which symbols to export. The png.h macro 'PNG_EXPORT' + * is used to mark the symbols. On some systems these symbols can be + * extracted at link time and need no special processing by the compiler, + * on other systems the symbols are flagged by the compiler and just + * the declaration requires a special tag applied (unfortunately) in a + * compiler dependent way. Some systems can do either. + * + * A small number of older systems also require a symbol from a DLL to + * be flagged to the program that calls it. This is a problem because + * we do not know in the header file included by application code that + * the symbol will come from a shared library, as opposed to a statically + * linked one. For this reason the application must tell us by setting + * the magic flag PNG_USE_DLL to turn on the special processing before + * it includes png.h. + * + * Four additional macros are used to make this happen: + * + * PNG_IMPEXP The magic (if any) to cause a symbol to be exported from + * the build or imported if PNG_USE_DLL is set - compiler + * and system specific. + * + * PNG_EXPORT_TYPE(type) A macro that pre or appends PNG_IMPEXP to + * 'type', compiler specific. + * + * PNG_DLL_EXPORT Set to the magic to use during a libpng build to + * make a symbol exported from the DLL. + * + * PNG_DLL_IMPORT Set to the magic to force the libpng symbols to come + * from a DLL - used to define PNG_IMPEXP when + * PNG_USE_DLL is set. + */ + +/* System specific discovery. + * ========================== + * This code is used at build time to find PNG_IMPEXP, the API settings + * and PNG_EXPORT_TYPE(), it may also set a macro to indicate the DLL + * import processing is possible. On Windows/x86 systems it also sets + * compiler-specific macros to the values required to change the calling + * conventions of the various functions. + */ +#if ( defined(_Windows) || defined(_WINDOWS) || defined(WIN32) ||\ + defined(_WIN32) || defined(__WIN32__) || defined(__CYGWIN__) ) &&\ + ( defined(_X86_) || defined(_X64_) || defined(_M_IX86) ||\ + defined(_M_X64) || defined(_M_IA64) ) + /* Windows system (DOS doesn't support DLLs) running on x86/x64. Includes + * builds under Cygwin or MinGW. Also includes Watcom builds but these need + * special treatment because they are not compatible with GCC or Visual C + * because of different calling conventions. + */ +# if PNG_API_RULE == 2 + /* If this line results in an error, either because __watcall is not + * understood or because of a redefine just below you cannot use *this* + * build of the library with the compiler you are using. *This* build was + * build using Watcom and applications must also be built using Watcom! + */ +# define PNGCAPI __watcall +# endif + +# if defined(__GNUC__) || (defined (_MSC_VER) && (_MSC_VER >= 800)) +# define PNGCAPI __cdecl +# if PNG_API_RULE == 1 +# define PNGAPI __stdcall +# endif +# else + /* An older compiler, or one not detected (erroneously) above, + * if necessary override on the command line to get the correct + * variants for the compiler. + */ +# ifndef PNGCAPI +# define PNGCAPI _cdecl +# endif +# if PNG_API_RULE == 1 && !defined(PNGAPI) +# define PNGAPI _stdcall +# endif +# endif /* compiler/api */ + /* NOTE: PNGCBAPI always defaults to PNGCAPI. */ + +# if defined(PNGAPI) && !defined(PNG_USER_PRIVATEBUILD) + ERROR: PNG_USER_PRIVATEBUILD must be defined if PNGAPI is changed +# endif + +# if (defined(_MSC_VER) && _MSC_VER < 800) ||\ + (defined(__BORLANDC__) && __BORLANDC__ < 0x500) + /* older Borland and MSC + * compilers used '__export' and required this to be after + * the type. + */ +# ifndef PNG_EXPORT_TYPE +# define PNG_EXPORT_TYPE(type) type PNG_IMPEXP +# endif +# define PNG_DLL_EXPORT __export +# else /* newer compiler */ +# define PNG_DLL_EXPORT __declspec(dllexport) +# ifndef PNG_DLL_IMPORT +# define PNG_DLL_IMPORT __declspec(dllimport) +# endif +# endif /* compiler */ + +#else /* !Windows/x86 */ +# if (defined(__IBMC__) || defined(__IBMCPP__)) && defined(__OS2__) +# define PNGAPI _System +# else /* !Windows/x86 && !OS/2 */ + /* Use the defaults, or define PNG*API on the command line (but + * this will have to be done for every compile!) + */ +# endif /* other system, !OS/2 */ +#endif /* !Windows/x86 */ + +/* Now do all the defaulting . */ +#ifndef PNGCAPI +# define PNGCAPI +#endif +#ifndef PNGCBAPI +# define PNGCBAPI PNGCAPI +#endif +#ifndef PNGAPI +# define PNGAPI PNGCAPI +#endif + +/* The default for PNG_IMPEXP depends on whether the library is + * being built or used. + */ +#ifndef PNG_IMPEXP +# ifdef PNGLIB_BUILD + /* Building the library */ +# if (defined(DLL_EXPORT)/*from libtool*/ ||\ + defined(_WINDLL) || defined(_DLL) || defined(__DLL__) ||\ + defined(_USRDLL) ||\ + defined(PNG_BUILD_DLL)) && defined(PNG_DLL_EXPORT) + /* Building a DLL. */ +# define PNG_IMPEXP PNG_DLL_EXPORT +# endif /* DLL */ +# else + /* Using the library */ +# if defined(PNG_USE_DLL) && defined(PNG_DLL_IMPORT) + /* This forces use of a DLL, disallowing static linking */ +# define PNG_IMPEXP PNG_DLL_IMPORT +# endif +# endif + +# ifndef PNG_IMPEXP +# define PNG_IMPEXP +# endif +#endif + +/* THe following complexity is concerned with getting the 'attributes' of the + * declared function in the correct place. This potentially requires a separate + * PNG_EXPORT function for every compiler. + */ +#ifndef PNG_FUNCTION +# ifdef __GNUC__ +# define PNG_FUNCTION(type, name, args, attributes)\ + attributes type name args +# else /* !GNUC */ +# ifdef _MSC_VER +# define PNG_FUNCTION(type, name, args, attributes)\ + attributes type name args +# else /* !MSC */ +# define PNG_FUNCTION(type, name, args, attributes)\ + type name args +# endif +# endif +#endif + +#ifndef PNG_EXPORT_TYPE +# define PNG_EXPORT_TYPE(type) PNG_IMPEXP type +#endif + + /* The ordinal value is only relevant when preprocessing png.h for symbol + * table entries, so we discard it here. See the .dfn files in the + * scripts directory. + */ +#ifndef PNG_EXPORTA +# define PNG_EXPORTA(ordinal, type, name, args, attributes)\ + extern PNG_FUNCTION(PNG_EXPORT_TYPE(type),(PNGAPI name),PNGARG(args),\ + attributes) +#endif + +#define PNG_EXPORT(ordinal, type, name, args)\ + PNG_EXPORTA(ordinal, type, name, args, ) + +/* Use PNG_REMOVED to comment out a removed interface. */ +#ifndef PNG_REMOVED +# define PNG_REMOVED(ordinal, type, name, args, attributes) +#endif + +#ifndef PNG_CALLBACK +# define PNG_CALLBACK(type, name, args, attributes)\ + type (PNGCBAPI name) PNGARG(args) attributes +#endif + +/* Support for compiler specific function attributes. These are used + * so that where compiler support is available incorrect use of API + * functions in png.h will generate compiler warnings. + * + * Added at libpng-1.2.41. + */ + +#ifndef PNG_NO_PEDANTIC_WARNINGS +# ifndef PNG_PEDANTIC_WARNINGS_SUPPORTED +# define PNG_PEDANTIC_WARNINGS_SUPPORTED +# endif +#endif + +#ifdef PNG_PEDANTIC_WARNINGS_SUPPORTED + /* Support for compiler specific function attributes. These are used + * so that where compiler support is available incorrect use of API + * functions in png.h will generate compiler warnings. Added at libpng + * version 1.2.41. + */ +# ifdef __GNUC__ +# ifndef PNG_USE_RESULT +# define PNG_USE_RESULT __attribute__((__warn_unused_result__)) +# endif +# ifndef PNG_NORETURN +# define PNG_NORETURN __attribute__((__noreturn__)) +# endif +# ifndef PNG_PTR_NORETURN +# define PNG_PTR_NORETURN __attribute__((__noreturn__)) +# endif +# ifndef PNG_ALLOCATED +# define PNG_ALLOCATED __attribute__((__malloc__)) +# endif + + /* This specifically protects structure members that should only be + * accessed from within the library, therefore should be empty during + * a library build. + */ +# ifndef PNGLIB_BUILD +# ifndef PNG_DEPRECATED +# define PNG_DEPRECATED __attribute__((__deprecated__)) +# endif +# ifndef PNG_DEPSTRUCT +# define PNG_DEPSTRUCT __attribute__((__deprecated__)) +# endif +# ifndef PNG_PRIVATE +# if 0 /* Doesn't work so we use deprecated instead*/ +# define PNG_PRIVATE \ + __attribute__((warning("This function is not exported by libpng."))) +# else +# define PNG_PRIVATE \ + __attribute__((__deprecated__)) +# endif +# endif /* PNG_PRIVATE */ +# endif /* PNGLIB_BUILD */ +# endif /* __GNUC__ */ +# ifdef _MSC_VER /* may need to check value */ +# ifndef PNG_USE_RESULT +# define PNG_USE_RESULT /*not supported*/ +# endif +# ifndef PNG_NORETURN +# define PNG_NORETURN __declspec(noreturn) +# endif +# ifndef PNG_PTR_NORETURN +# define PNG_PTR_NORETURN /*not supported*/ +# endif +# ifndef PNG_ALLOCATED +# define PNG_ALLOCATED __declspec(restrict) +# endif + + /* This specifically protects structure members that should only be + * accessed from within the library, therefore should be empty during + * a library build. + */ +# ifndef PNGLIB_BUILD +# ifndef PNG_DEPRECATED +# define PNG_DEPRECATED __declspec(deprecated) +# endif +# ifndef PNG_DEPSTRUCT +# define PNG_DEPSTRUCT __declspec(deprecated) +# endif +# ifndef PNG_PRIVATE +# define PNG_PRIVATE __declspec(deprecated) +# endif /* PNG_PRIVATE */ +# endif /* PNGLIB_BUILD */ +# endif /* __GNUC__ */ +#endif /* PNG_PEDANTIC_WARNINGS */ + +#ifndef PNG_DEPRECATED +# define PNG_DEPRECATED /* Use of this function is deprecated */ +#endif +#ifndef PNG_USE_RESULT +# define PNG_USE_RESULT /* The result of this function must be checked */ +#endif +#ifndef PNG_NORETURN +# define PNG_NORETURN /* This function does not return */ +#endif +#ifndef PNG_ALLOCATED +# define PNG_ALLOCATED /* The result of the function is new memory */ +#endif +#ifndef PNG_DEPSTRUCT +# define PNG_DEPSTRUCT /* Access to this struct member is deprecated */ +#endif +#ifndef PNG_PRIVATE +# define PNG_PRIVATE /* This is a private libpng function */ +#endif +#ifndef PNG_FP_EXPORT /* A floating point API. */ +# ifdef PNG_FLOATING_POINT_SUPPORTED +# define PNG_FP_EXPORT(ordinal, type, name, args)\ + PNG_EXPORT(ordinal, type, name, args) +# else /* No floating point APIs */ +# define PNG_FP_EXPORT(ordinal, type, name, args) +# endif +#endif +#ifndef PNG_FIXED_EXPORT /* A fixed point API. */ +# ifdef PNG_FIXED_POINT_SUPPORTED +# define PNG_FIXED_EXPORT(ordinal, type, name, args)\ + PNG_EXPORT(ordinal, type, name, args) +# else /* No fixed point APIs */ +# define PNG_FIXED_EXPORT(ordinal, type, name, args) +# endif +#endif + +/* The following uses const char * instead of char * for error + * and warning message functions, so some compilers won't complain. + * If you do not want to use const, define PNG_NO_CONST here. + * + * This should not change how the APIs are called, so it can be done + * on a per-file basis in the application. + */ +#ifndef PNG_CONST +# ifndef PNG_NO_CONST +# define PNG_CONST const +# else +# define PNG_CONST +# endif +#endif + +/* Some typedefs to get us started. These should be safe on most of the + * common platforms. The typedefs should be at least as large as the + * numbers suggest (a png_uint_32 must be at least 32 bits long), but they + * don't have to be exactly that size. Some compilers dislike passing + * unsigned shorts as function parameters, so you may be better off using + * unsigned int for png_uint_16. + */ + +#if defined(INT_MAX) && (INT_MAX > 0x7ffffffeL) +typedef unsigned int png_uint_32; +typedef int png_int_32; +#else +typedef unsigned long png_uint_32; +typedef long png_int_32; +#endif +typedef unsigned short png_uint_16; +typedef short png_int_16; +typedef unsigned char png_byte; + +#ifdef PNG_NO_SIZE_T +typedef unsigned int png_size_t; +#else +typedef size_t png_size_t; +#endif +#define png_sizeof(x) (sizeof (x)) + +/* The following is needed for medium model support. It cannot be in the + * pngpriv.h header. Needs modification for other compilers besides + * MSC. Model independent support declares all arrays and pointers to be + * large using the far keyword. The zlib version used must also support + * model independent data. As of version zlib 1.0.4, the necessary changes + * have been made in zlib. The USE_FAR_KEYWORD define triggers other + * changes that are needed. (Tim Wegner) + */ + +/* Separate compiler dependencies (problem here is that zlib.h always + * defines FAR. (SJT) + */ +#ifdef __BORLANDC__ +# if defined(__LARGE__) || defined(__HUGE__) || defined(__COMPACT__) +# define LDATA 1 +# else +# define LDATA 0 +# endif + /* GRR: why is Cygwin in here? Cygwin is not Borland C... */ +# if !defined(__WIN32__) && !defined(__FLAT__) && !defined(__CYGWIN__) +# define PNG_MAX_MALLOC_64K /* only used in build */ +# if (LDATA != 1) +# ifndef FAR +# define FAR __far +# endif +# define USE_FAR_KEYWORD +# endif /* LDATA != 1 */ + /* Possibly useful for moving data out of default segment. + * Uncomment it if you want. Could also define FARDATA as + * const if your compiler supports it. (SJT) +# define FARDATA FAR + */ +# endif /* __WIN32__, __FLAT__, __CYGWIN__ */ +#endif /* __BORLANDC__ */ + + +/* Suggest testing for specific compiler first before testing for + * FAR. The Watcom compiler defines both __MEDIUM__ and M_I86MM, + * making reliance oncertain keywords suspect. (SJT) + */ + +/* MSC Medium model */ +#ifdef FAR +# ifdef M_I86MM +# define USE_FAR_KEYWORD +# define FARDATA FAR +# include +# endif +#endif + +/* SJT: default case */ +#ifndef FAR +# define FAR +#endif + +/* At this point FAR is always defined */ +#ifndef FARDATA +# define FARDATA +#endif + +/* Typedef for floating-point numbers that are converted + * to fixed-point with a multiple of 100,000, e.g., gamma + */ +typedef png_int_32 png_fixed_point; + +/* Add typedefs for pointers */ +typedef void FAR * png_voidp; +typedef PNG_CONST void FAR * png_const_voidp; +typedef png_byte FAR * png_bytep; +typedef PNG_CONST png_byte FAR * png_const_bytep; +typedef png_uint_32 FAR * png_uint_32p; +typedef PNG_CONST png_uint_32 FAR * png_const_uint_32p; +typedef png_int_32 FAR * png_int_32p; +typedef PNG_CONST png_int_32 FAR * png_const_int_32p; +typedef png_uint_16 FAR * png_uint_16p; +typedef PNG_CONST png_uint_16 FAR * png_const_uint_16p; +typedef png_int_16 FAR * png_int_16p; +typedef PNG_CONST png_int_16 FAR * png_const_int_16p; +typedef char FAR * png_charp; +typedef PNG_CONST char FAR * png_const_charp; +typedef png_fixed_point FAR * png_fixed_point_p; +typedef PNG_CONST png_fixed_point FAR * png_const_fixed_point_p; +typedef png_size_t FAR * png_size_tp; +typedef PNG_CONST png_size_t FAR * png_const_size_tp; + +#ifdef PNG_STDIO_SUPPORTED +typedef FILE * png_FILE_p; +#endif + +#ifdef PNG_FLOATING_POINT_SUPPORTED +typedef double FAR * png_doublep; +typedef PNG_CONST double FAR * png_const_doublep; +#endif + +/* Pointers to pointers; i.e. arrays */ +typedef png_byte FAR * FAR * png_bytepp; +typedef png_uint_32 FAR * FAR * png_uint_32pp; +typedef png_int_32 FAR * FAR * png_int_32pp; +typedef png_uint_16 FAR * FAR * png_uint_16pp; +typedef png_int_16 FAR * FAR * png_int_16pp; +typedef PNG_CONST char FAR * FAR * png_const_charpp; +typedef char FAR * FAR * png_charpp; +typedef png_fixed_point FAR * FAR * png_fixed_point_pp; +#ifdef PNG_FLOATING_POINT_SUPPORTED +typedef double FAR * FAR * png_doublepp; +#endif + +/* Pointers to pointers to pointers; i.e., pointer to array */ +typedef char FAR * FAR * FAR * png_charppp; + +/* png_alloc_size_t is guaranteed to be no smaller than png_size_t, + * and no smaller than png_uint_32. Casts from png_size_t or png_uint_32 + * to png_alloc_size_t are not necessary; in fact, it is recommended + * not to use them at all so that the compiler can complain when something + * turns out to be problematic. + * Casts in the other direction (from png_alloc_size_t to png_size_t or + * png_uint_32) should be explicitly applied; however, we do not expect + * to encounter practical situations that require such conversions. + */ +#if defined(__TURBOC__) && !defined(__FLAT__) + typedef unsigned long png_alloc_size_t; +#else +# if defined(_MSC_VER) && defined(MAXSEG_64K) + typedef unsigned long png_alloc_size_t; +# else + /* This is an attempt to detect an old Windows system where (int) is + * actually 16 bits, in that case png_malloc must have an argument with a + * bigger size to accomodate the requirements of the library. + */ +# if (defined(_Windows) || defined(_WINDOWS) || defined(_WINDOWS_)) && \ + (!defined(INT_MAX) || INT_MAX <= 0x7ffffffeL) + typedef DWORD png_alloc_size_t; +# else + typedef png_size_t png_alloc_size_t; +# endif +# endif +#endif + +#endif /* PNGCONF_H */ diff --git a/programs/develop/libraries/libpng/pngdebug.h b/programs/develop/libraries/libpng/pngdebug.h new file mode 100644 index 0000000000..16f81fdd14 --- /dev/null +++ b/programs/develop/libraries/libpng/pngdebug.h @@ -0,0 +1,157 @@ + +/* pngdebug.h - Debugging macros for libpng, also used in pngtest.c + * + * Copyright (c) 1998-2011 Glenn Randers-Pehrson + * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) + * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) + * + * Last changed in libpng 1.5.0 [January 6, 2011] + * + * This code is released under the libpng license. + * For conditions of distribution and use, see the disclaimer + * and license in png.h + */ + +/* Define PNG_DEBUG at compile time for debugging information. Higher + * numbers for PNG_DEBUG mean more debugging information. This has + * only been added since version 0.95 so it is not implemented throughout + * libpng yet, but more support will be added as needed. + * + * png_debug[1-2]?(level, message ,arg{0-2}) + * Expands to a statement (either a simple expression or a compound + * do..while(0) statement) that outputs a message with parameter + * substitution if PNG_DEBUG is defined to 2 or more. If PNG_DEBUG + * is undefined, 0 or 1 every png_debug expands to a simple expression + * (actually ((void)0)). + * + * level: level of detail of message, starting at 0. A level 'n' + * message is preceded by 'n' tab characters (not implemented + * on Microsoft compilers unless PNG_DEBUG_FILE is also + * defined, to allow debug DLL compilation with no standard IO). + * message: a printf(3) style text string. A trailing '\n' is added + * to the message. + * arg: 0 to 2 arguments for printf(3) style substitution in message. + */ +#ifndef PNGDEBUG_H +#define PNGDEBUG_H +/* These settings control the formatting of messages in png.c and pngerror.c */ +/* Moved to pngdebug.h at 1.5.0 */ +# ifndef PNG_LITERAL_SHARP +# define PNG_LITERAL_SHARP 0x23 +# endif +# ifndef PNG_LITERAL_LEFT_SQUARE_BRACKET +# define PNG_LITERAL_LEFT_SQUARE_BRACKET 0x5b +# endif +# ifndef PNG_LITERAL_RIGHT_SQUARE_BRACKET +# define PNG_LITERAL_RIGHT_SQUARE_BRACKET 0x5d +# endif +# ifndef PNG_STRING_NEWLINE +# define PNG_STRING_NEWLINE "\n" +# endif + +#ifdef PNG_DEBUG +# if (PNG_DEBUG > 0) +# if !defined(PNG_DEBUG_FILE) && defined(_MSC_VER) +# include +# if (PNG_DEBUG > 1) +# ifndef _DEBUG +# define _DEBUG +# endif +# ifndef png_debug +# define png_debug(l,m) _RPT0(_CRT_WARN,m PNG_STRING_NEWLINE) +# endif +# ifndef png_debug1 +# define png_debug1(l,m,p1) _RPT1(_CRT_WARN,m PNG_STRING_NEWLINE,p1) +# endif +# ifndef png_debug2 +# define png_debug2(l,m,p1,p2) \ + _RPT2(_CRT_WARN,m PNG_STRING_NEWLINE,p1,p2) +# endif +# endif +# else /* PNG_DEBUG_FILE || !_MSC_VER */ +# ifndef PNG_STDIO_SUPPORTED +# include /* not included yet */ +# endif +# ifndef PNG_DEBUG_FILE +# define PNG_DEBUG_FILE stderr +# endif /* PNG_DEBUG_FILE */ + +# if (PNG_DEBUG > 1) +/* Note: ["%s"m PNG_STRING_NEWLINE] probably does not work on + * non-ISO compilers + */ +# ifdef __STDC__ +# ifndef png_debug +# define png_debug(l,m) \ + do { \ + int num_tabs=l; \ + fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \ + (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":"")))); \ + } while (0) +# endif +# ifndef png_debug1 +# define png_debug1(l,m,p1) \ + do { \ + int num_tabs=l; \ + fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \ + (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1); \ + } while (0) +# endif +# ifndef png_debug2 +# define png_debug2(l,m,p1,p2) \ + do { \ + int num_tabs=l; \ + fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \ + (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1,p2); \ + } while (0) +# endif +# else /* __STDC __ */ +# ifndef png_debug +# define png_debug(l,m) \ + do { \ + int num_tabs=l; \ + char format[256]; \ + snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \ + (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \ + m,PNG_STRING_NEWLINE); \ + fprintf(PNG_DEBUG_FILE,format); \ + } while (0) +# endif +# ifndef png_debug1 +# define png_debug1(l,m,p1) \ + do { \ + int num_tabs=l; \ + char format[256]; \ + snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \ + (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \ + m,PNG_STRING_NEWLINE); \ + fprintf(PNG_DEBUG_FILE,format,p1); \ + } while (0) +# endif +# ifndef png_debug2 +# define png_debug2(l,m,p1,p2) \ + do { \ + int num_tabs=l; \ + char format[256]; \ + snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \ + (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \ + m,PNG_STRING_NEWLINE); \ + fprintf(PNG_DEBUG_FILE,format,p1,p2); \ + } while (0) +# endif +# endif /* __STDC __ */ +# endif /* (PNG_DEBUG > 1) */ + +# endif /* _MSC_VER */ +# endif /* (PNG_DEBUG > 0) */ +#endif /* PNG_DEBUG */ +#ifndef png_debug +# define png_debug(l, m) ((void)0) +#endif +#ifndef png_debug1 +# define png_debug1(l, m, p1) ((void)0) +#endif +#ifndef png_debug2 +# define png_debug2(l, m, p1, p2) ((void)0) +#endif +#endif /* PNGDEBUG_H */ diff --git a/programs/develop/libraries/libpng/pngerror.c b/programs/develop/libraries/libpng/pngerror.c new file mode 100644 index 0000000000..8290bb4106 --- /dev/null +++ b/programs/develop/libraries/libpng/pngerror.c @@ -0,0 +1,447 @@ + +/* pngerror.c - stub functions for i/o and memory allocation + * + * Last changed in libpng 1.5.1 [February 3, 2011] + * Copyright (c) 1998-2011 Glenn Randers-Pehrson + * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) + * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) + * + * This code is released under the libpng license. + * For conditions of distribution and use, see the disclaimer + * and license in png.h + * + * This file provides a location for all error handling. Users who + * need special error handling are expected to write replacement functions + * and use png_set_error_fn() to use those functions. See the instructions + * at each function. + */ + +#include "pngpriv.h" + +#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) + +static PNG_FUNCTION(void, png_default_error,PNGARG((png_structp png_ptr, + png_const_charp error_message)),PNG_NORETURN); + +#ifdef PNG_WARNINGS_SUPPORTED +static void /* PRIVATE */ +png_default_warning PNGARG((png_structp png_ptr, + png_const_charp warning_message)); +#endif /* PNG_WARNINGS_SUPPORTED */ + +/* This function is called whenever there is a fatal error. This function + * should not be changed. If there is a need to handle errors differently, + * you should supply a replacement error function and use png_set_error_fn() + * to replace the error function at run-time. + */ +#ifdef PNG_ERROR_TEXT_SUPPORTED +PNG_FUNCTION(void,PNGAPI +png_error,(png_structp png_ptr, png_const_charp error_message),PNG_NORETURN) +{ +#ifdef PNG_ERROR_NUMBERS_SUPPORTED + char msg[16]; + if (png_ptr != NULL) + { + if (png_ptr->flags& + (PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT)) + { + if (*error_message == PNG_LITERAL_SHARP) + { + /* Strip "#nnnn " from beginning of error message. */ + int offset; + for (offset = 1; offset<15; offset++) + if (error_message[offset] == ' ') + break; + + if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT) + { + int i; + for (i = 0; i < offset - 1; i++) + msg[i] = error_message[i + 1]; + msg[i - 1] = '\0'; + error_message = msg; + } + + else + error_message += offset; + } + + else + { + if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT) + { + msg[0] = '0'; + msg[1] = '\0'; + error_message = msg; + } + } + } + } +#endif + if (png_ptr != NULL && png_ptr->error_fn != NULL) + (*(png_ptr->error_fn))(png_ptr, error_message); + + /* If the custom handler doesn't exist, or if it returns, + use the default handler, which will not return. */ + png_default_error(png_ptr, error_message); +} +#else +PNG_FUNCTION(void,PNGAPI +png_err,(png_structp png_ptr),PNG_NORETURN) +{ + if (png_ptr != NULL && png_ptr->error_fn != NULL) + (*(png_ptr->error_fn))(png_ptr, '\0'); + + /* If the custom handler doesn't exist, or if it returns, + use the default handler, which will not return. */ + png_default_error(png_ptr, '\0'); +} +#endif /* PNG_ERROR_TEXT_SUPPORTED */ + +#ifdef PNG_WARNINGS_SUPPORTED +/* This function is called whenever there is a non-fatal error. This function + * should not be changed. If there is a need to handle warnings differently, + * you should supply a replacement warning function and use + * png_set_error_fn() to replace the warning function at run-time. + */ +void PNGAPI +png_warning(png_structp png_ptr, png_const_charp warning_message) +{ + int offset = 0; + if (png_ptr != NULL) + { +#ifdef PNG_ERROR_NUMBERS_SUPPORTED + if (png_ptr->flags& + (PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT)) +#endif + { + if (*warning_message == PNG_LITERAL_SHARP) + { + for (offset = 1; offset < 15; offset++) + if (warning_message[offset] == ' ') + break; + } + } + } + if (png_ptr != NULL && png_ptr->warning_fn != NULL) + (*(png_ptr->warning_fn))(png_ptr, warning_message + offset); + else + png_default_warning(png_ptr, warning_message + offset); +} +#endif /* PNG_WARNINGS_SUPPORTED */ + +#ifdef PNG_BENIGN_ERRORS_SUPPORTED +void PNGAPI +png_benign_error(png_structp png_ptr, png_const_charp error_message) +{ + if (png_ptr->flags & PNG_FLAG_BENIGN_ERRORS_WARN) + png_warning(png_ptr, error_message); + else + png_error(png_ptr, error_message); +} +#endif + +/* These utilities are used internally to build an error message that relates + * to the current chunk. The chunk name comes from png_ptr->chunk_name, + * this is used to prefix the message. The message is limited in length + * to 63 bytes, the name characters are output as hex digits wrapped in [] + * if the character is invalid. + */ +#define isnonalpha(c) ((c) < 65 || (c) > 122 || ((c) > 90 && (c) < 97)) +static PNG_CONST char png_digit[16] = { + '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', + 'A', 'B', 'C', 'D', 'E', 'F' +}; + +#define PNG_MAX_ERROR_TEXT 64 +#if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_ERROR_TEXT_SUPPORTED) +static void /* PRIVATE */ +png_format_buffer(png_structp png_ptr, png_charp buffer, png_const_charp + error_message) +{ + int iout = 0, iin = 0; + + while (iin < 4) + { + int c = png_ptr->chunk_name[iin++]; + if (isnonalpha(c)) + { + buffer[iout++] = PNG_LITERAL_LEFT_SQUARE_BRACKET; + buffer[iout++] = png_digit[(c & 0xf0) >> 4]; + buffer[iout++] = png_digit[c & 0x0f]; + buffer[iout++] = PNG_LITERAL_RIGHT_SQUARE_BRACKET; + } + + else + { + buffer[iout++] = (png_byte)c; + } + } + + if (error_message == NULL) + buffer[iout] = '\0'; + + else + { + buffer[iout++] = ':'; + buffer[iout++] = ' '; + png_memcpy(buffer + iout, error_message, PNG_MAX_ERROR_TEXT); + buffer[iout + PNG_MAX_ERROR_TEXT - 1] = '\0'; + } +} +#endif /* PNG_WARNINGS_SUPPORTED || PNG_ERROR_TEXT_SUPPORTED */ + +#if defined(PNG_READ_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED) +PNG_FUNCTION(void,PNGAPI +png_chunk_error,(png_structp png_ptr, png_const_charp error_message), + PNG_NORETURN) +{ + char msg[18+PNG_MAX_ERROR_TEXT]; + if (png_ptr == NULL) + png_error(png_ptr, error_message); + + else + { + png_format_buffer(png_ptr, msg, error_message); + png_error(png_ptr, msg); + } +} +#endif /* PNG_READ_SUPPORTED && PNG_ERROR_TEXT_SUPPORTED */ + +#ifdef PNG_WARNINGS_SUPPORTED +void PNGAPI +png_chunk_warning(png_structp png_ptr, png_const_charp warning_message) +{ + char msg[18+PNG_MAX_ERROR_TEXT]; + if (png_ptr == NULL) + png_warning(png_ptr, warning_message); + + else + { + png_format_buffer(png_ptr, msg, warning_message); + png_warning(png_ptr, msg); + } +} +#endif /* PNG_WARNINGS_SUPPORTED */ + +#ifdef PNG_READ_SUPPORTED +#ifdef PNG_BENIGN_ERRORS_SUPPORTED +void PNGAPI +png_chunk_benign_error(png_structp png_ptr, png_const_charp error_message) +{ + if (png_ptr->flags & PNG_FLAG_BENIGN_ERRORS_WARN) + png_chunk_warning(png_ptr, error_message); + + else + png_chunk_error(png_ptr, error_message); +} +#endif +#endif /* PNG_READ_SUPPORTED */ + +#ifdef PNG_ERROR_TEXT_SUPPORTED +#ifdef PNG_FLOATING_POINT_SUPPORTED +PNG_FUNCTION(void, +png_fixed_error,(png_structp png_ptr, png_const_charp name),PNG_NORETURN) +{ +# define fixed_message "fixed point overflow in " +# define fixed_message_ln ((sizeof fixed_message)-1) + int iin; + char msg[fixed_message_ln+PNG_MAX_ERROR_TEXT]; + png_memcpy(msg, fixed_message, fixed_message_ln); + iin = 0; + if (name != NULL) while (iin < (PNG_MAX_ERROR_TEXT-1) && name[iin] != 0) + { + msg[fixed_message_ln + iin] = name[iin]; + ++iin; + } + msg[fixed_message_ln + iin] = 0; + png_error(png_ptr, msg); +} +#endif +#endif + +#ifdef PNG_SETJMP_SUPPORTED +/* This API only exists if ANSI-C style error handling is used, + * otherwise it is necessary for png_default_error to be overridden. + */ +jmp_buf* PNGAPI +png_set_longjmp_fn(png_structp png_ptr, png_longjmp_ptr longjmp_fn, + size_t jmp_buf_size) +{ + if (png_ptr == NULL || jmp_buf_size != png_sizeof(jmp_buf)) + return NULL; + + png_ptr->longjmp_fn = longjmp_fn; + return &png_ptr->png_jmpbuf; +} +#endif + +/* This is the default error handling function. Note that replacements for + * this function MUST NOT RETURN, or the program will likely crash. This + * function is used by default, or if the program supplies NULL for the + * error function pointer in png_set_error_fn(). + */ +static PNG_FUNCTION(void /* PRIVATE */, +png_default_error,(png_structp png_ptr, png_const_charp error_message), + PNG_NORETURN) +{ +#ifdef PNG_CONSOLE_IO_SUPPORTED +#ifdef PNG_ERROR_NUMBERS_SUPPORTED + if (*error_message == PNG_LITERAL_SHARP) + { + /* Strip "#nnnn " from beginning of error message. */ + int offset; + char error_number[16]; + for (offset = 0; offset<15; offset++) + { + error_number[offset] = error_message[offset + 1]; + if (error_message[offset] == ' ') + break; + } + + if ((offset > 1) && (offset < 15)) + { + error_number[offset - 1] = '\0'; + fprintf(stderr, "libpng error no. %s: %s", + error_number, error_message + offset + 1); + fprintf(stderr, PNG_STRING_NEWLINE); + } + + else + { + fprintf(stderr, "libpng error: %s, offset=%d", + error_message, offset); + fprintf(stderr, PNG_STRING_NEWLINE); + } + } + else +#endif + { + fprintf(stderr, "libpng error: %s", error_message); + fprintf(stderr, PNG_STRING_NEWLINE); + } +#endif +#ifndef PNG_CONSOLE_IO_SUPPORTED + PNG_UNUSED(error_message) /* Make compiler happy */ +#endif + png_longjmp(png_ptr, 1); +} + +PNG_FUNCTION(void,PNGAPI +png_longjmp,(png_structp png_ptr, int val),PNG_NORETURN) +{ +#ifdef PNG_SETJMP_SUPPORTED + if (png_ptr && png_ptr->longjmp_fn) + { +# ifdef USE_FAR_KEYWORD + { + jmp_buf png_jmpbuf; + png_memcpy(png_jmpbuf, png_ptr->png_jmpbuf, png_sizeof(jmp_buf)); + png_ptr->longjmp_fn(png_jmpbuf, val); + } + +# else + png_ptr->longjmp_fn(png_ptr->png_jmpbuf, val); +# endif + } +#endif + /* Here if not setjmp support or if png_ptr is null. */ + PNG_ABORT(); +} + +#ifdef PNG_WARNINGS_SUPPORTED +/* This function is called when there is a warning, but the library thinks + * it can continue anyway. Replacement functions don't have to do anything + * here if you don't want them to. In the default configuration, png_ptr is + * not used, but it is passed in case it may be useful. + */ +static void /* PRIVATE */ +png_default_warning(png_structp png_ptr, png_const_charp warning_message) +{ +#ifdef PNG_CONSOLE_IO_SUPPORTED +# ifdef PNG_ERROR_NUMBERS_SUPPORTED + if (*warning_message == PNG_LITERAL_SHARP) + { + int offset; + char warning_number[16]; + for (offset = 0; offset < 15; offset++) + { + warning_number[offset] = warning_message[offset + 1]; + if (warning_message[offset] == ' ') + break; + } + + if ((offset > 1) && (offset < 15)) + { + warning_number[offset + 1] = '\0'; + fprintf(stderr, "libpng warning no. %s: %s", + warning_number, warning_message + offset); + fprintf(stderr, PNG_STRING_NEWLINE); + } + + else + { + fprintf(stderr, "libpng warning: %s", + warning_message); + fprintf(stderr, PNG_STRING_NEWLINE); + } + } + else +# endif + + { + fprintf(stderr, "libpng warning: %s", warning_message); + fprintf(stderr, PNG_STRING_NEWLINE); + } +#else + PNG_UNUSED(warning_message) /* Make compiler happy */ +#endif + PNG_UNUSED(png_ptr) /* Make compiler happy */ +} +#endif /* PNG_WARNINGS_SUPPORTED */ + +/* This function is called when the application wants to use another method + * of handling errors and warnings. Note that the error function MUST NOT + * return to the calling routine or serious problems will occur. The return + * method used in the default routine calls longjmp(png_ptr->png_jmpbuf, 1) + */ +void PNGAPI +png_set_error_fn(png_structp png_ptr, png_voidp error_ptr, + png_error_ptr error_fn, png_error_ptr warning_fn) +{ + if (png_ptr == NULL) + return; + + png_ptr->error_ptr = error_ptr; + png_ptr->error_fn = error_fn; + png_ptr->warning_fn = warning_fn; +} + + +/* This function returns a pointer to the error_ptr associated with the user + * functions. The application should free any memory associated with this + * pointer before png_write_destroy and png_read_destroy are called. + */ +png_voidp PNGAPI +png_get_error_ptr(png_const_structp png_ptr) +{ + if (png_ptr == NULL) + return NULL; + + return ((png_voidp)png_ptr->error_ptr); +} + + +#ifdef PNG_ERROR_NUMBERS_SUPPORTED +void PNGAPI +png_set_strip_error_numbers(png_structp png_ptr, png_uint_32 strip_mode) +{ + if (png_ptr != NULL) + { + png_ptr->flags &= + ((~(PNG_FLAG_STRIP_ERROR_NUMBERS | + PNG_FLAG_STRIP_ERROR_TEXT))&strip_mode); + } +} +#endif +#endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */ diff --git a/programs/develop/libraries/libpng/pngget.c b/programs/develop/libraries/libpng/pngget.c new file mode 100644 index 0000000000..b5e5798c02 --- /dev/null +++ b/programs/develop/libraries/libpng/pngget.c @@ -0,0 +1,1032 @@ + +/* pngget.c - retrieval of values from info struct + * + * Last changed in libpng 1.5.1 [February 3, 2011] + * Copyright (c) 1998-2011 Glenn Randers-Pehrson + * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) + * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) + * + * This code is released under the libpng license. + * For conditions of distribution and use, see the disclaimer + * and license in png.h + * + */ + +#include "pngpriv.h" + +#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) + +png_uint_32 PNGAPI +png_get_valid(png_const_structp png_ptr, png_const_infop info_ptr, + png_uint_32 flag) +{ + if (png_ptr != NULL && info_ptr != NULL) + return(info_ptr->valid & flag); + + return(0); +} + +png_size_t PNGAPI +png_get_rowbytes(png_const_structp png_ptr, png_const_infop info_ptr) +{ + if (png_ptr != NULL && info_ptr != NULL) + return(info_ptr->rowbytes); + + return(0); +} + +#ifdef PNG_INFO_IMAGE_SUPPORTED +png_bytepp PNGAPI +png_get_rows(png_const_structp png_ptr, png_const_infop info_ptr) +{ + if (png_ptr != NULL && info_ptr != NULL) + return(info_ptr->row_pointers); + + return(0); +} +#endif + +#ifdef PNG_EASY_ACCESS_SUPPORTED +/* Easy access to info, added in libpng-0.99 */ +png_uint_32 PNGAPI +png_get_image_width(png_const_structp png_ptr, png_const_infop info_ptr) +{ + if (png_ptr != NULL && info_ptr != NULL) + return info_ptr->width; + + return (0); +} + +png_uint_32 PNGAPI +png_get_image_height(png_const_structp png_ptr, png_const_infop info_ptr) +{ + if (png_ptr != NULL && info_ptr != NULL) + return info_ptr->height; + + return (0); +} + +png_byte PNGAPI +png_get_bit_depth(png_const_structp png_ptr, png_const_infop info_ptr) +{ + if (png_ptr != NULL && info_ptr != NULL) + return info_ptr->bit_depth; + + return (0); +} + +png_byte PNGAPI +png_get_color_type(png_const_structp png_ptr, png_const_infop info_ptr) +{ + if (png_ptr != NULL && info_ptr != NULL) + return info_ptr->color_type; + + return (0); +} + +png_byte PNGAPI +png_get_filter_type(png_const_structp png_ptr, png_const_infop info_ptr) +{ + if (png_ptr != NULL && info_ptr != NULL) + return info_ptr->filter_type; + + return (0); +} + +png_byte PNGAPI +png_get_interlace_type(png_const_structp png_ptr, png_const_infop info_ptr) +{ + if (png_ptr != NULL && info_ptr != NULL) + return info_ptr->interlace_type; + + return (0); +} + +png_byte PNGAPI +png_get_compression_type(png_const_structp png_ptr, png_const_infop info_ptr) +{ + if (png_ptr != NULL && info_ptr != NULL) + return info_ptr->compression_type; + + return (0); +} + +png_uint_32 PNGAPI +png_get_x_pixels_per_meter(png_const_structp png_ptr, png_const_infop info_ptr) +{ +#ifdef PNG_pHYs_SUPPORTED + if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs)) + { + png_debug1(1, "in %s retrieval function", + "png_get_x_pixels_per_meter"); + + if (info_ptr->phys_unit_type == PNG_RESOLUTION_METER) + return (info_ptr->x_pixels_per_unit); + } +#endif + + return (0); +} + +png_uint_32 PNGAPI +png_get_y_pixels_per_meter(png_const_structp png_ptr, png_const_infop info_ptr) +{ +#ifdef PNG_pHYs_SUPPORTED + if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs)) + { + png_debug1(1, "in %s retrieval function", + "png_get_y_pixels_per_meter"); + + if (info_ptr->phys_unit_type == PNG_RESOLUTION_METER) + return (info_ptr->y_pixels_per_unit); + } +#endif + + return (0); +} + +png_uint_32 PNGAPI +png_get_pixels_per_meter(png_const_structp png_ptr, png_const_infop info_ptr) +{ +#ifdef PNG_pHYs_SUPPORTED + if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs)) + { + png_debug1(1, "in %s retrieval function", "png_get_pixels_per_meter"); + + if (info_ptr->phys_unit_type == PNG_RESOLUTION_METER && + info_ptr->x_pixels_per_unit == info_ptr->y_pixels_per_unit) + return (info_ptr->x_pixels_per_unit); + } +#endif + + return (0); +} + +#ifdef PNG_FLOATING_POINT_SUPPORTED +float PNGAPI +png_get_pixel_aspect_ratio(png_const_structp png_ptr, png_const_infop info_ptr) +{ +#ifdef PNG_READ_pHYs_SUPPORTED + if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs)) + { + png_debug1(1, "in %s retrieval function", "png_get_aspect_ratio"); + + if (info_ptr->x_pixels_per_unit != 0) + return ((float)((float)info_ptr->y_pixels_per_unit + /(float)info_ptr->x_pixels_per_unit)); + } +#endif + + return ((float)0.0); +} +#endif + +#ifdef PNG_FIXED_POINT_SUPPORTED +png_fixed_point PNGAPI +png_get_pixel_aspect_ratio_fixed(png_const_structp png_ptr, + png_const_infop info_ptr) +{ +#ifdef PNG_READ_pHYs_SUPPORTED + if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs) + && info_ptr->x_pixels_per_unit > 0 && info_ptr->y_pixels_per_unit > 0 + && info_ptr->x_pixels_per_unit <= PNG_UINT_31_MAX + && info_ptr->y_pixels_per_unit <= PNG_UINT_31_MAX) + { + png_fixed_point res; + + png_debug1(1, "in %s retrieval function", "png_get_aspect_ratio_fixed"); + + /* The following casts work because a PNG 4 byte integer only has a valid + * range of 0..2^31-1; otherwise the cast might overflow. + */ + if (png_muldiv(&res, (png_int_32)info_ptr->y_pixels_per_unit, PNG_FP_1, + (png_int_32)info_ptr->x_pixels_per_unit)) + return res; + } +#endif + + return 0; +} +#endif + +png_int_32 PNGAPI +png_get_x_offset_microns(png_const_structp png_ptr, png_const_infop info_ptr) +{ +#ifdef PNG_oFFs_SUPPORTED + if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs)) + { + png_debug1(1, "in %s retrieval function", "png_get_x_offset_microns"); + + if (info_ptr->offset_unit_type == PNG_OFFSET_MICROMETER) + return (info_ptr->x_offset); + } +#endif + + return (0); +} + +png_int_32 PNGAPI +png_get_y_offset_microns(png_const_structp png_ptr, png_const_infop info_ptr) +{ +#ifdef PNG_oFFs_SUPPORTED + if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs)) + { + png_debug1(1, "in %s retrieval function", "png_get_y_offset_microns"); + + if (info_ptr->offset_unit_type == PNG_OFFSET_MICROMETER) + return (info_ptr->y_offset); + } +#endif + + return (0); +} + +png_int_32 PNGAPI +png_get_x_offset_pixels(png_const_structp png_ptr, png_const_infop info_ptr) +{ +#ifdef PNG_oFFs_SUPPORTED + if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs)) + { + png_debug1(1, "in %s retrieval function", "png_get_x_offset_pixels"); + + if (info_ptr->offset_unit_type == PNG_OFFSET_PIXEL) + return (info_ptr->x_offset); + } +#endif + + return (0); +} + +png_int_32 PNGAPI +png_get_y_offset_pixels(png_const_structp png_ptr, png_const_infop info_ptr) +{ +#ifdef PNG_oFFs_SUPPORTED + if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs)) + { + png_debug1(1, "in %s retrieval function", "png_get_y_offset_pixels"); + + if (info_ptr->offset_unit_type == PNG_OFFSET_PIXEL) + return (info_ptr->y_offset); + } +#endif + + return (0); +} + +#ifdef PNG_INCH_CONVERSIONS_SUPPORTED +static png_uint_32 +ppi_from_ppm(png_uint_32 ppm) +{ +#if 0 + /* The conversion is *(2.54/100), in binary (32 digits): + * .00000110100000001001110101001001 + */ + png_uint_32 t1001, t1101; + ppm >>= 1; /* .1 */ + t1001 = ppm + (ppm >> 3); /* .1001 */ + t1101 = t1001 + (ppm >> 1); /* .1101 */ + ppm >>= 20; /* .000000000000000000001 */ + t1101 += t1101 >> 15; /* .1101000000000001101 */ + t1001 >>= 11; /* .000000000001001 */ + t1001 += t1001 >> 12; /* .000000000001001000000001001 */ + ppm += t1001; /* .000000000001001000001001001 */ + ppm += t1101; /* .110100000001001110101001001 */ + return (ppm + 16) >> 5;/* .00000110100000001001110101001001 */ +#else + /* The argument is a PNG unsigned integer, so it is not permitted + * to be bigger than 2^31. + */ + png_fixed_point result; + if (ppm <= PNG_UINT_31_MAX && png_muldiv(&result, (png_int_32)ppm, 127, + 5000)) + return result; + + /* Overflow. */ + return 0; +#endif +} + +png_uint_32 PNGAPI +png_get_pixels_per_inch(png_const_structp png_ptr, png_const_infop info_ptr) +{ + return ppi_from_ppm(png_get_pixels_per_meter(png_ptr, info_ptr)); +} + +png_uint_32 PNGAPI +png_get_x_pixels_per_inch(png_const_structp png_ptr, png_const_infop info_ptr) +{ + return ppi_from_ppm(png_get_x_pixels_per_meter(png_ptr, info_ptr)); +} + +png_uint_32 PNGAPI +png_get_y_pixels_per_inch(png_const_structp png_ptr, png_const_infop info_ptr) +{ + return ppi_from_ppm(png_get_y_pixels_per_meter(png_ptr, info_ptr)); +} + +#ifdef PNG_FIXED_POINT_SUPPORTED +static png_fixed_point +png_fixed_inches_from_microns(png_structp png_ptr, png_int_32 microns) +{ + /* Convert from metres * 1,000,000 to inches * 100,000, meters to + * inches is simply *(100/2.54), so we want *(10/2.54) == 500/127. + * Notice that this can overflow - a warning is output and 0 is + * returned. + */ + return png_muldiv_warn(png_ptr, microns, 500, 127); +} + +png_fixed_point PNGAPI +png_get_x_offset_inches_fixed(png_structp png_ptr, + png_const_infop info_ptr) +{ + return png_fixed_inches_from_microns(png_ptr, + png_get_x_offset_microns(png_ptr, info_ptr)); +} +#endif + +#ifdef PNG_FIXED_POINT_SUPPORTED +png_fixed_point PNGAPI +png_get_y_offset_inches_fixed(png_structp png_ptr, + png_const_infop info_ptr) +{ + return png_fixed_inches_from_microns(png_ptr, + png_get_y_offset_microns(png_ptr, info_ptr)); +} +#endif + +#ifdef PNG_FLOATING_POINT_SUPPORTED +float PNGAPI +png_get_x_offset_inches(png_const_structp png_ptr, png_const_infop info_ptr) +{ + /* To avoid the overflow do the conversion directly in floating + * point. + */ + return (float)(png_get_x_offset_microns(png_ptr, info_ptr) * .00003937); +} +#endif + +#ifdef PNG_FLOATING_POINT_SUPPORTED +float PNGAPI +png_get_y_offset_inches(png_const_structp png_ptr, png_const_infop info_ptr) +{ + /* To avoid the overflow do the conversion directly in floating + * point. + */ + return (float)(png_get_y_offset_microns(png_ptr, info_ptr) * .00003937); +} +#endif + +#ifdef PNG_pHYs_SUPPORTED +png_uint_32 PNGAPI +png_get_pHYs_dpi(png_const_structp png_ptr, png_const_infop info_ptr, + png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type) +{ + png_uint_32 retval = 0; + + if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs)) + { + png_debug1(1, "in %s retrieval function", "pHYs"); + + if (res_x != NULL) + { + *res_x = info_ptr->x_pixels_per_unit; + retval |= PNG_INFO_pHYs; + } + + if (res_y != NULL) + { + *res_y = info_ptr->y_pixels_per_unit; + retval |= PNG_INFO_pHYs; + } + + if (unit_type != NULL) + { + *unit_type = (int)info_ptr->phys_unit_type; + retval |= PNG_INFO_pHYs; + + if (*unit_type == 1) + { + if (res_x != NULL) *res_x = (png_uint_32)(*res_x * .0254 + .50); + if (res_y != NULL) *res_y = (png_uint_32)(*res_y * .0254 + .50); + } + } + } + + return (retval); +} +#endif /* PNG_pHYs_SUPPORTED */ +#endif /* PNG_INCH_CONVERSIONS_SUPPORTED */ + +/* png_get_channels really belongs in here, too, but it's been around longer */ + +#endif /* PNG_EASY_ACCESS_SUPPORTED */ + +png_byte PNGAPI +png_get_channels(png_const_structp png_ptr, png_const_infop info_ptr) +{ + if (png_ptr != NULL && info_ptr != NULL) + return(info_ptr->channels); + + return (0); +} + +png_const_bytep PNGAPI +png_get_signature(png_const_structp png_ptr, png_infop info_ptr) +{ + if (png_ptr != NULL && info_ptr != NULL) + return(info_ptr->signature); + + return (NULL); +} + +#ifdef PNG_bKGD_SUPPORTED +png_uint_32 PNGAPI +png_get_bKGD(png_const_structp png_ptr, png_infop info_ptr, + png_color_16p *background) +{ + if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_bKGD) + && background != NULL) + { + png_debug1(1, "in %s retrieval function", "bKGD"); + + *background = &(info_ptr->background); + return (PNG_INFO_bKGD); + } + + return (0); +} +#endif + +#ifdef PNG_cHRM_SUPPORTED +# ifdef PNG_FLOATING_POINT_SUPPORTED +png_uint_32 PNGAPI +png_get_cHRM(png_const_structp png_ptr, png_const_infop info_ptr, + double *white_x, double *white_y, double *red_x, double *red_y, + double *green_x, double *green_y, double *blue_x, double *blue_y) +{ + if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM)) + { + png_debug1(1, "in %s retrieval function", "cHRM"); + + if (white_x != NULL) + *white_x = png_float(png_ptr, info_ptr->x_white, "cHRM white X"); + if (white_y != NULL) + *white_y = png_float(png_ptr, info_ptr->y_white, "cHRM white Y"); + if (red_x != NULL) + *red_x = png_float(png_ptr, info_ptr->x_red, "cHRM red X"); + if (red_y != NULL) + *red_y = png_float(png_ptr, info_ptr->y_red, "cHRM red Y"); + if (green_x != NULL) + *green_x = png_float(png_ptr, info_ptr->x_green, "cHRM green X"); + if (green_y != NULL) + *green_y = png_float(png_ptr, info_ptr->y_green, "cHRM green Y"); + if (blue_x != NULL) + *blue_x = png_float(png_ptr, info_ptr->x_blue, "cHRM blue X"); + if (blue_y != NULL) + *blue_y = png_float(png_ptr, info_ptr->y_blue, "cHRM blue Y"); + return (PNG_INFO_cHRM); + } + + return (0); +} +# endif + +# ifdef PNG_FIXED_POINT_SUPPORTED +png_uint_32 PNGAPI +png_get_cHRM_fixed(png_const_structp png_ptr, png_const_infop info_ptr, + png_fixed_point *white_x, png_fixed_point *white_y, png_fixed_point *red_x, + png_fixed_point *red_y, png_fixed_point *green_x, png_fixed_point *green_y, + png_fixed_point *blue_x, png_fixed_point *blue_y) +{ + png_debug1(1, "in %s retrieval function", "cHRM"); + + if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM)) + { + if (white_x != NULL) + *white_x = info_ptr->x_white; + if (white_y != NULL) + *white_y = info_ptr->y_white; + if (red_x != NULL) + *red_x = info_ptr->x_red; + if (red_y != NULL) + *red_y = info_ptr->y_red; + if (green_x != NULL) + *green_x = info_ptr->x_green; + if (green_y != NULL) + *green_y = info_ptr->y_green; + if (blue_x != NULL) + *blue_x = info_ptr->x_blue; + if (blue_y != NULL) + *blue_y = info_ptr->y_blue; + return (PNG_INFO_cHRM); + } + + return (0); +} +# endif +#endif + +#ifdef PNG_gAMA_SUPPORTED +png_uint_32 PNGFAPI +png_get_gAMA_fixed(png_const_structp png_ptr, png_const_infop info_ptr, + png_fixed_point *file_gamma) +{ + png_debug1(1, "in %s retrieval function", "gAMA"); + + if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA) + && file_gamma != NULL) + { + *file_gamma = info_ptr->gamma; + return (PNG_INFO_gAMA); + } + + return (0); +} +# ifdef PNG_FLOATING_POINT_SUPPORTED +png_uint_32 PNGAPI +png_get_gAMA(png_const_structp png_ptr, png_const_infop info_ptr, + double *file_gamma) +{ + png_fixed_point igamma; + png_uint_32 ok = png_get_gAMA_fixed(png_ptr, info_ptr, &igamma); + + if (ok) + *file_gamma = png_float(png_ptr, igamma, "png_get_gAMA"); + + return ok; +} + +# endif +#endif + +#ifdef PNG_sRGB_SUPPORTED +png_uint_32 PNGAPI +png_get_sRGB(png_const_structp png_ptr, png_const_infop info_ptr, + int *file_srgb_intent) +{ + png_debug1(1, "in %s retrieval function", "sRGB"); + + if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_sRGB) + && file_srgb_intent != NULL) + { + *file_srgb_intent = (int)info_ptr->srgb_intent; + return (PNG_INFO_sRGB); + } + + return (0); +} +#endif + +#ifdef PNG_iCCP_SUPPORTED +png_uint_32 PNGAPI +png_get_iCCP(png_const_structp png_ptr, png_const_infop info_ptr, + png_charpp name, int *compression_type, + png_bytepp profile, png_uint_32 *proflen) +{ + png_debug1(1, "in %s retrieval function", "iCCP"); + + if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_iCCP) + && name != NULL && profile != NULL && proflen != NULL) + { + *name = info_ptr->iccp_name; + *profile = info_ptr->iccp_profile; + /* Compression_type is a dummy so the API won't have to change + * if we introduce multiple compression types later. + */ + *proflen = (int)info_ptr->iccp_proflen; + *compression_type = (int)info_ptr->iccp_compression; + return (PNG_INFO_iCCP); + } + + return (0); +} +#endif + +#ifdef PNG_sPLT_SUPPORTED +png_uint_32 PNGAPI +png_get_sPLT(png_const_structp png_ptr, png_const_infop info_ptr, + png_sPLT_tpp spalettes) +{ + if (png_ptr != NULL && info_ptr != NULL && spalettes != NULL) + { + *spalettes = info_ptr->splt_palettes; + return ((png_uint_32)info_ptr->splt_palettes_num); + } + + return (0); +} +#endif + +#ifdef PNG_hIST_SUPPORTED +png_uint_32 PNGAPI +png_get_hIST(png_const_structp png_ptr, png_const_infop info_ptr, + png_uint_16p *hist) +{ + png_debug1(1, "in %s retrieval function", "hIST"); + + if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_hIST) + && hist != NULL) + { + *hist = info_ptr->hist; + return (PNG_INFO_hIST); + } + + return (0); +} +#endif + +png_uint_32 PNGAPI +png_get_IHDR(png_structp png_ptr, png_infop info_ptr, + png_uint_32 *width, png_uint_32 *height, int *bit_depth, + int *color_type, int *interlace_type, int *compression_type, + int *filter_type) + +{ + png_debug1(1, "in %s retrieval function", "IHDR"); + + if (png_ptr == NULL || info_ptr == NULL || width == NULL || + height == NULL || bit_depth == NULL || color_type == NULL) + return (0); + + *width = info_ptr->width; + *height = info_ptr->height; + *bit_depth = info_ptr->bit_depth; + *color_type = info_ptr->color_type; + + if (compression_type != NULL) + *compression_type = info_ptr->compression_type; + + if (filter_type != NULL) + *filter_type = info_ptr->filter_type; + + if (interlace_type != NULL) + *interlace_type = info_ptr->interlace_type; + + /* This is redundant if we can be sure that the info_ptr values were all + * assigned in png_set_IHDR(). We do the check anyhow in case an + * application has ignored our advice not to mess with the members + * of info_ptr directly. + */ + png_check_IHDR (png_ptr, info_ptr->width, info_ptr->height, + info_ptr->bit_depth, info_ptr->color_type, info_ptr->interlace_type, + info_ptr->compression_type, info_ptr->filter_type); + + return (1); +} + +#ifdef PNG_oFFs_SUPPORTED +png_uint_32 PNGAPI +png_get_oFFs(png_const_structp png_ptr, png_const_infop info_ptr, + png_int_32 *offset_x, png_int_32 *offset_y, int *unit_type) +{ + png_debug1(1, "in %s retrieval function", "oFFs"); + + if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs) + && offset_x != NULL && offset_y != NULL && unit_type != NULL) + { + *offset_x = info_ptr->x_offset; + *offset_y = info_ptr->y_offset; + *unit_type = (int)info_ptr->offset_unit_type; + return (PNG_INFO_oFFs); + } + + return (0); +} +#endif + +#ifdef PNG_pCAL_SUPPORTED +png_uint_32 PNGAPI +png_get_pCAL(png_const_structp png_ptr, png_const_infop info_ptr, + png_charp *purpose, png_int_32 *X0, png_int_32 *X1, int *type, int *nparams, + png_charp *units, png_charpp *params) +{ + png_debug1(1, "in %s retrieval function", "pCAL"); + + if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pCAL) + && purpose != NULL && X0 != NULL && X1 != NULL && type != NULL && + nparams != NULL && units != NULL && params != NULL) + { + *purpose = info_ptr->pcal_purpose; + *X0 = info_ptr->pcal_X0; + *X1 = info_ptr->pcal_X1; + *type = (int)info_ptr->pcal_type; + *nparams = (int)info_ptr->pcal_nparams; + *units = info_ptr->pcal_units; + *params = info_ptr->pcal_params; + return (PNG_INFO_pCAL); + } + + return (0); +} +#endif + +#ifdef PNG_sCAL_SUPPORTED +# ifdef PNG_FIXED_POINT_SUPPORTED +# ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED +png_uint_32 PNGAPI +png_get_sCAL_fixed(png_structp png_ptr, png_const_infop info_ptr, + int *unit, png_fixed_point *width, png_fixed_point *height) +{ + if (png_ptr != NULL && info_ptr != NULL && + (info_ptr->valid & PNG_INFO_sCAL)) + { + *unit = info_ptr->scal_unit; + /*TODO: make this work without FP support */ + *width = png_fixed(png_ptr, atof(info_ptr->scal_s_width), "sCAL width"); + *height = png_fixed(png_ptr, atof(info_ptr->scal_s_height), + "sCAL height"); + return (PNG_INFO_sCAL); + } + + return(0); +} +# endif /* FLOATING_ARITHMETIC */ +# endif /* FIXED_POINT */ +# ifdef PNG_FLOATING_POINT_SUPPORTED +png_uint_32 PNGAPI +png_get_sCAL(png_const_structp png_ptr, png_const_infop info_ptr, + int *unit, double *width, double *height) +{ + if (png_ptr != NULL && info_ptr != NULL && + (info_ptr->valid & PNG_INFO_sCAL)) + { + *unit = info_ptr->scal_unit; + *width = atof(info_ptr->scal_s_width); + *height = atof(info_ptr->scal_s_height); + return (PNG_INFO_sCAL); + } + + return(0); +} +# endif /* FLOATING POINT */ +png_uint_32 PNGAPI +png_get_sCAL_s(png_const_structp png_ptr, png_const_infop info_ptr, + int *unit, png_charpp width, png_charpp height) +{ + if (png_ptr != NULL && info_ptr != NULL && + (info_ptr->valid & PNG_INFO_sCAL)) + { + *unit = info_ptr->scal_unit; + *width = info_ptr->scal_s_width; + *height = info_ptr->scal_s_height; + return (PNG_INFO_sCAL); + } + + return(0); +} +#endif /* sCAL */ + +#ifdef PNG_pHYs_SUPPORTED +png_uint_32 PNGAPI +png_get_pHYs(png_const_structp png_ptr, png_const_infop info_ptr, + png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type) +{ + png_uint_32 retval = 0; + + png_debug1(1, "in %s retrieval function", "pHYs"); + + if (png_ptr != NULL && info_ptr != NULL && + (info_ptr->valid & PNG_INFO_pHYs)) + { + if (res_x != NULL) + { + *res_x = info_ptr->x_pixels_per_unit; + retval |= PNG_INFO_pHYs; + } + + if (res_y != NULL) + { + *res_y = info_ptr->y_pixels_per_unit; + retval |= PNG_INFO_pHYs; + } + + if (unit_type != NULL) + { + *unit_type = (int)info_ptr->phys_unit_type; + retval |= PNG_INFO_pHYs; + } + } + + return (retval); +} +#endif /* pHYs */ + +png_uint_32 PNGAPI +png_get_PLTE(png_const_structp png_ptr, png_const_infop info_ptr, + png_colorp *palette, int *num_palette) +{ + png_debug1(1, "in %s retrieval function", "PLTE"); + + if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_PLTE) + && palette != NULL) + { + *palette = info_ptr->palette; + *num_palette = info_ptr->num_palette; + png_debug1(3, "num_palette = %d", *num_palette); + return (PNG_INFO_PLTE); + } + + return (0); +} + +#ifdef PNG_sBIT_SUPPORTED +png_uint_32 PNGAPI +png_get_sBIT(png_const_structp png_ptr, png_infop info_ptr, + png_color_8p *sig_bit) +{ + png_debug1(1, "in %s retrieval function", "sBIT"); + + if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_sBIT) + && sig_bit != NULL) + { + *sig_bit = &(info_ptr->sig_bit); + return (PNG_INFO_sBIT); + } + + return (0); +} +#endif + +#ifdef PNG_TEXT_SUPPORTED +png_uint_32 PNGAPI +png_get_text(png_const_structp png_ptr, png_const_infop info_ptr, + png_textp *text_ptr, int *num_text) +{ + if (png_ptr != NULL && info_ptr != NULL && info_ptr->num_text > 0) + { + png_debug1(1, "in %s retrieval function", + (png_ptr->chunk_name[0] == '\0' ? "text" : + (png_const_charp)png_ptr->chunk_name)); + + if (text_ptr != NULL) + *text_ptr = info_ptr->text; + + if (num_text != NULL) + *num_text = info_ptr->num_text; + + return ((png_uint_32)info_ptr->num_text); + } + + if (num_text != NULL) + *num_text = 0; + + return(0); +} +#endif + +#ifdef PNG_tIME_SUPPORTED +png_uint_32 PNGAPI +png_get_tIME(png_const_structp png_ptr, png_infop info_ptr, png_timep *mod_time) +{ + png_debug1(1, "in %s retrieval function", "tIME"); + + if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_tIME) + && mod_time != NULL) + { + *mod_time = &(info_ptr->mod_time); + return (PNG_INFO_tIME); + } + + return (0); +} +#endif + +#ifdef PNG_tRNS_SUPPORTED +png_uint_32 PNGAPI +png_get_tRNS(png_const_structp png_ptr, png_infop info_ptr, + png_bytep *trans_alpha, int *num_trans, png_color_16p *trans_color) +{ + png_uint_32 retval = 0; + if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_tRNS)) + { + png_debug1(1, "in %s retrieval function", "tRNS"); + + if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) + { + if (trans_alpha != NULL) + { + *trans_alpha = info_ptr->trans_alpha; + retval |= PNG_INFO_tRNS; + } + + if (trans_color != NULL) + *trans_color = &(info_ptr->trans_color); + } + + else /* if (info_ptr->color_type != PNG_COLOR_TYPE_PALETTE) */ + { + if (trans_color != NULL) + { + *trans_color = &(info_ptr->trans_color); + retval |= PNG_INFO_tRNS; + } + + if (trans_alpha != NULL) + *trans_alpha = NULL; + } + + if (num_trans != NULL) + { + *num_trans = info_ptr->num_trans; + retval |= PNG_INFO_tRNS; + } + } + + return (retval); +} +#endif + +#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED +int PNGAPI +png_get_unknown_chunks(png_const_structp png_ptr, png_const_infop info_ptr, + png_unknown_chunkpp unknowns) +{ + if (png_ptr != NULL && info_ptr != NULL && unknowns != NULL) + { + *unknowns = info_ptr->unknown_chunks; + return info_ptr->unknown_chunks_num; + } + + return (0); +} +#endif + +#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED +png_byte PNGAPI +png_get_rgb_to_gray_status (png_const_structp png_ptr) +{ + return (png_byte)(png_ptr ? png_ptr->rgb_to_gray_status : 0); +} +#endif + +#ifdef PNG_USER_CHUNKS_SUPPORTED +png_voidp PNGAPI +png_get_user_chunk_ptr(png_const_structp png_ptr) +{ + return (png_ptr ? png_ptr->user_chunk_ptr : NULL); +} +#endif + +png_size_t PNGAPI +png_get_compression_buffer_size(png_const_structp png_ptr) +{ + return (png_ptr ? png_ptr->zbuf_size : 0L); +} + + +#ifdef PNG_SET_USER_LIMITS_SUPPORTED +/* These functions were added to libpng 1.2.6 and were enabled + * by default in libpng-1.4.0 */ +png_uint_32 PNGAPI +png_get_user_width_max (png_const_structp png_ptr) +{ + return (png_ptr ? png_ptr->user_width_max : 0); +} + +png_uint_32 PNGAPI +png_get_user_height_max (png_const_structp png_ptr) +{ + return (png_ptr ? png_ptr->user_height_max : 0); +} + +/* This function was added to libpng 1.4.0 */ +png_uint_32 PNGAPI +png_get_chunk_cache_max (png_const_structp png_ptr) +{ + return (png_ptr ? png_ptr->user_chunk_cache_max : 0); +} + +/* This function was added to libpng 1.4.1 */ +png_alloc_size_t PNGAPI +png_get_chunk_malloc_max (png_const_structp png_ptr) +{ + return (png_ptr ? png_ptr->user_chunk_malloc_max : 0); +} +#endif /* ?PNG_SET_USER_LIMITS_SUPPORTED */ + +/* These functions were added to libpng 1.4.0 */ +#ifdef PNG_IO_STATE_SUPPORTED +png_uint_32 PNGAPI +png_get_io_state (png_structp png_ptr) +{ + return png_ptr->io_state; +} + +png_uint_32 PNGAPI +png_get_io_chunk_type (png_const_structp png_ptr) +{ + return ((png_ptr->chunk_name[0] << 24) + + (png_ptr->chunk_name[1] << 16) + + (png_ptr->chunk_name[2] << 8) + + (png_ptr->chunk_name[3])); +} + +png_const_bytep PNGAPI +png_get_io_chunk_name (png_structp png_ptr) +{ + return png_ptr->chunk_name; +} +#endif /* ?PNG_IO_STATE_SUPPORTED */ + +#endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */ diff --git a/programs/develop/libraries/libpng/pnginfo.h b/programs/develop/libraries/libpng/pnginfo.h new file mode 100644 index 0000000000..fa19f85e72 --- /dev/null +++ b/programs/develop/libraries/libpng/pnginfo.h @@ -0,0 +1,270 @@ + +/* pnginfo.h - header file for PNG reference library + * + * Copyright (c) 1998-2011 Glenn Randers-Pehrson + * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) + * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) + * + * Last changed in libpng 1.5.0 [January 6, 2011] + * + * This code is released under the libpng license. + * For conditions of distribution and use, see the disclaimer + * and license in png.h + */ + + /* png_info is a structure that holds the information in a PNG file so + * that the application can find out the characteristics of the image. + * If you are reading the file, this structure will tell you what is + * in the PNG file. If you are writing the file, fill in the information + * you want to put into the PNG file, using png_set_*() functions, then + * call png_write_info(). + * + * The names chosen should be very close to the PNG specification, so + * consult that document for information about the meaning of each field. + * + * With libpng < 0.95, it was only possible to directly set and read the + * the values in the png_info_struct, which meant that the contents and + * order of the values had to remain fixed. With libpng 0.95 and later, + * however, there are now functions that abstract the contents of + * png_info_struct from the application, so this makes it easier to use + * libpng with dynamic libraries, and even makes it possible to use + * libraries that don't have all of the libpng ancillary chunk-handing + * functionality. In libpng-1.5.0 this was moved into a separate private + * file that is not visible to applications. + * + * The following members may have allocated storage attached that should be + * cleaned up before the structure is discarded: palette, trans, text, + * pcal_purpose, pcal_units, pcal_params, hist, iccp_name, iccp_profile, + * splt_palettes, scal_unit, row_pointers, and unknowns. By default, these + * are automatically freed when the info structure is deallocated, if they were + * allocated internally by libpng. This behavior can be changed by means + * of the png_data_freer() function. + * + * More allocation details: all the chunk-reading functions that + * change these members go through the corresponding png_set_* + * functions. A function to clear these members is available: see + * png_free_data(). The png_set_* functions do not depend on being + * able to point info structure members to any of the storage they are + * passed (they make their own copies), EXCEPT that the png_set_text + * functions use the same storage passed to them in the text_ptr or + * itxt_ptr structure argument, and the png_set_rows and png_set_unknowns + * functions do not make their own copies. + */ +#ifndef PNGINFO_H +#define PNGINFO_H + +struct png_info_def +{ + /* the following are necessary for every PNG file */ + png_uint_32 width; /* width of image in pixels (from IHDR) */ + png_uint_32 height; /* height of image in pixels (from IHDR) */ + png_uint_32 valid; /* valid chunk data (see PNG_INFO_ below) */ + png_size_t rowbytes; /* bytes needed to hold an untransformed row */ + png_colorp palette; /* array of color values (valid & PNG_INFO_PLTE) */ + png_uint_16 num_palette; /* number of color entries in "palette" (PLTE) */ + png_uint_16 num_trans; /* number of transparent palette color (tRNS) */ + png_byte bit_depth; /* 1, 2, 4, 8, or 16 bits/channel (from IHDR) */ + png_byte color_type; /* see PNG_COLOR_TYPE_ below (from IHDR) */ + /* The following three should have been named *_method not *_type */ + png_byte compression_type; /* must be PNG_COMPRESSION_TYPE_BASE (IHDR) */ + png_byte filter_type; /* must be PNG_FILTER_TYPE_BASE (from IHDR) */ + png_byte interlace_type; /* One of PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */ + + /* The following is informational only on read, and not used on writes. */ + png_byte channels; /* number of data channels per pixel (1, 2, 3, 4) */ + png_byte pixel_depth; /* number of bits per pixel */ + png_byte spare_byte; /* to align the data, and for future use */ + png_byte signature[8]; /* magic bytes read by libpng from start of file */ + + /* The rest of the data is optional. If you are reading, check the + * valid field to see if the information in these are valid. If you + * are writing, set the valid field to those chunks you want written, + * and initialize the appropriate fields below. + */ + +#if defined(PNG_gAMA_SUPPORTED) + /* The gAMA chunk describes the gamma characteristics of the system + * on which the image was created, normally in the range [1.0, 2.5]. + * Data is valid if (valid & PNG_INFO_gAMA) is non-zero. + */ + png_fixed_point gamma; +#endif + +#ifdef PNG_sRGB_SUPPORTED + /* GR-P, 0.96a */ + /* Data valid if (valid & PNG_INFO_sRGB) non-zero. */ + png_byte srgb_intent; /* sRGB rendering intent [0, 1, 2, or 3] */ +#endif + +#ifdef PNG_TEXT_SUPPORTED + /* The tEXt, and zTXt chunks contain human-readable textual data in + * uncompressed, compressed, and optionally compressed forms, respectively. + * The data in "text" is an array of pointers to uncompressed, + * null-terminated C strings. Each chunk has a keyword that describes the + * textual data contained in that chunk. Keywords are not required to be + * unique, and the text string may be empty. Any number of text chunks may + * be in an image. + */ + int num_text; /* number of comments read or comments to write */ + int max_text; /* current size of text array */ + png_textp text; /* array of comments read or comments to write */ +#endif /* PNG_TEXT_SUPPORTED */ + +#ifdef PNG_tIME_SUPPORTED + /* The tIME chunk holds the last time the displayed image data was + * modified. See the png_time struct for the contents of this struct. + */ + png_time mod_time; +#endif + +#ifdef PNG_sBIT_SUPPORTED + /* The sBIT chunk specifies the number of significant high-order bits + * in the pixel data. Values are in the range [1, bit_depth], and are + * only specified for the channels in the pixel data. The contents of + * the low-order bits is not specified. Data is valid if + * (valid & PNG_INFO_sBIT) is non-zero. + */ + png_color_8 sig_bit; /* significant bits in color channels */ +#endif + +#if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_EXPAND_SUPPORTED) || \ +defined(PNG_READ_BACKGROUND_SUPPORTED) + /* The tRNS chunk supplies transparency data for paletted images and + * other image types that don't need a full alpha channel. There are + * "num_trans" transparency values for a paletted image, stored in the + * same order as the palette colors, starting from index 0. Values + * for the data are in the range [0, 255], ranging from fully transparent + * to fully opaque, respectively. For non-paletted images, there is a + * single color specified that should be treated as fully transparent. + * Data is valid if (valid & PNG_INFO_tRNS) is non-zero. + */ + png_bytep trans; /* alpha values for paletted image */ + png_bytep trans_alpha; /* alpha values for paletted image */ + png_color_16 trans_color; /* transparent color for non-palette image */ +#endif + +#if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) + /* The bKGD chunk gives the suggested image background color if the + * display program does not have its own background color and the image + * is needs to composited onto a background before display. The colors + * in "background" are normally in the same color space/depth as the + * pixel data. Data is valid if (valid & PNG_INFO_bKGD) is non-zero. + */ + png_color_16 background; +#endif + +#ifdef PNG_oFFs_SUPPORTED + /* The oFFs chunk gives the offset in "offset_unit_type" units rightwards + * and downwards from the top-left corner of the display, page, or other + * application-specific co-ordinate space. See the PNG_OFFSET_ defines + * below for the unit types. Valid if (valid & PNG_INFO_oFFs) non-zero. + */ + png_int_32 x_offset; /* x offset on page */ + png_int_32 y_offset; /* y offset on page */ + png_byte offset_unit_type; /* offset units type */ +#endif + +#ifdef PNG_pHYs_SUPPORTED + /* The pHYs chunk gives the physical pixel density of the image for + * display or printing in "phys_unit_type" units (see PNG_RESOLUTION_ + * defines below). Data is valid if (valid & PNG_INFO_pHYs) is non-zero. + */ + png_uint_32 x_pixels_per_unit; /* horizontal pixel density */ + png_uint_32 y_pixels_per_unit; /* vertical pixel density */ + png_byte phys_unit_type; /* resolution type (see PNG_RESOLUTION_ below) */ +#endif + +#ifdef PNG_hIST_SUPPORTED + /* The hIST chunk contains the relative frequency or importance of the + * various palette entries, so that a viewer can intelligently select a + * reduced-color palette, if required. Data is an array of "num_palette" + * values in the range [0,65535]. Data valid if (valid & PNG_INFO_hIST) + * is non-zero. + */ + png_uint_16p hist; +#endif + +#ifdef PNG_cHRM_SUPPORTED + /* The cHRM chunk describes the CIE color characteristics of the monitor + * on which the PNG was created. This data allows the viewer to do gamut + * mapping of the input image to ensure that the viewer sees the same + * colors in the image as the creator. Values are in the range + * [0.0, 0.8]. Data valid if (valid & PNG_INFO_cHRM) non-zero. + */ + png_fixed_point x_white; + png_fixed_point y_white; + png_fixed_point x_red; + png_fixed_point y_red; + png_fixed_point x_green; + png_fixed_point y_green; + png_fixed_point x_blue; + png_fixed_point y_blue; +#endif + +#ifdef PNG_pCAL_SUPPORTED + /* The pCAL chunk describes a transformation between the stored pixel + * values and original physical data values used to create the image. + * The integer range [0, 2^bit_depth - 1] maps to the floating-point + * range given by [pcal_X0, pcal_X1], and are further transformed by a + * (possibly non-linear) transformation function given by "pcal_type" + * and "pcal_params" into "pcal_units". Please see the PNG_EQUATION_ + * defines below, and the PNG-Group's PNG extensions document for a + * complete description of the transformations and how they should be + * implemented, and for a description of the ASCII parameter strings. + * Data values are valid if (valid & PNG_INFO_pCAL) non-zero. + */ + png_charp pcal_purpose; /* pCAL chunk description string */ + png_int_32 pcal_X0; /* minimum value */ + png_int_32 pcal_X1; /* maximum value */ + png_charp pcal_units; /* Latin-1 string giving physical units */ + png_charpp pcal_params; /* ASCII strings containing parameter values */ + png_byte pcal_type; /* equation type (see PNG_EQUATION_ below) */ + png_byte pcal_nparams; /* number of parameters given in pcal_params */ +#endif + +/* New members added in libpng-1.0.6 */ + png_uint_32 free_me; /* flags items libpng is responsible for freeing */ + +#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) || \ + defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED) + /* Storage for unknown chunks that the library doesn't recognize. */ + png_unknown_chunkp unknown_chunks; + int unknown_chunks_num; +#endif + +#ifdef PNG_iCCP_SUPPORTED + /* iCCP chunk data. */ + png_charp iccp_name; /* profile name */ + png_bytep iccp_profile; /* International Color Consortium profile data */ + png_uint_32 iccp_proflen; /* ICC profile data length */ + png_byte iccp_compression; /* Always zero */ +#endif + +#ifdef PNG_sPLT_SUPPORTED + /* Data on sPLT chunks (there may be more than one). */ + png_sPLT_tp splt_palettes; + png_uint_32 splt_palettes_num; +#endif + +#ifdef PNG_sCAL_SUPPORTED + /* The sCAL chunk describes the actual physical dimensions of the + * subject matter of the graphic. The chunk contains a unit specification + * a byte value, and two ASCII strings representing floating-point + * values. The values are width and height corresponsing to one pixel + * in the image. Data values are valid if (valid & PNG_INFO_sCAL) is + * non-zero. + */ + png_byte scal_unit; /* unit of physical scale */ + png_charp scal_s_width; /* string containing height */ + png_charp scal_s_height; /* string containing width */ +#endif + +#ifdef PNG_INFO_IMAGE_SUPPORTED + /* Memory has been allocated if (valid & PNG_ALLOCATED_INFO_ROWS) + non-zero */ + /* Data valid if (valid & PNG_INFO_IDAT) non-zero */ + png_bytepp row_pointers; /* the image bits */ +#endif + +}; +#endif /* PNGINFO_H */ diff --git a/programs/develop/libraries/libpng/pnglibconf.h b/programs/develop/libraries/libpng/pnglibconf.h new file mode 100644 index 0000000000..52a158bf35 --- /dev/null +++ b/programs/develop/libraries/libpng/pnglibconf.h @@ -0,0 +1,173 @@ +/* pnglibconf.h - library build configuration */ + +/* libpng version 1.5.0 - January 6, 2011 */ + +/* Copyright (c) 1998-2011 Glenn Randers-Pehrson */ + +/* This code is released under the libpng license. */ +/* For conditions of distribution and use, see the disclaimer */ +/* and license in png.h */ + +/* pnglibconf.h */ +/* Machine generated file: DO NOT EDIT */ +/* Derived from: scripts/pnglibconf.dfa */ +#ifndef PNGLCONF_H +#define PNGLCONF_H +/* settings */ +#define PNG_MAX_GAMMA_8 11 +#define PNG_CALLOC_SUPPORTED +#define PNG_QUANTIZE_RED_BITS 5 +#define PNG_USER_WIDTH_MAX 1000000L +#define PNG_QUANTIZE_GREEN_BITS 5 +#define PNG_API_RULE 0 +#define PNG_QUANTIZE_BLUE_BITS 5 +#define PNG_USER_CHUNK_CACHE_MAX 0 +#define PNG_USER_HEIGHT_MAX 1000000L +#define PNG_sCAL_PRECISION 5 +#define PNG_COST_SHIFT 3 +#define PNG_WEIGHT_SHIFT 8 +#define PNG_USER_CHUNK_MALLOC_MAX 0 +#define PNG_DEFAULT_READ_MACROS 1 +#define PNG_ZBUF_SIZE 8192 +#define PNG_GAMMA_THRESHOLD_FIXED 5000 +/* end of settings */ +/* options */ +#define PNG_INFO_IMAGE_SUPPORTED +#define PNG_HANDLE_AS_UNKNOWN_SUPPORTED +#define PNG_POINTER_INDEXING_SUPPORTED +#define PNG_WARNINGS_SUPPORTED +#define PNG_FLOATING_ARITHMETIC_SUPPORTED +#define PNG_WRITE_SUPPORTED +#define PNG_WRITE_INTERLACING_SUPPORTED +#define PNG_WRITE_16BIT_SUPPORTED +#define PNG_EASY_ACCESS_SUPPORTED +#define PNG_ALIGN_MEMORY_SUPPORTED +#define PNG_WRITE_WEIGHTED_FILTER_SUPPORTED +#define PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED +#define PNG_USER_LIMITS_SUPPORTED +#define PNG_FIXED_POINT_SUPPORTED +/*#undef PNG_ERROR_NUMBERS_SUPPORTED*/ +#define PNG_ERROR_TEXT_SUPPORTED +#define PNG_READ_SUPPORTED +/*#undef PNG_READ_16_TO_8_ACCURATE_SCALE_SUPPORTED*/ +#define PNG_BENIGN_ERRORS_SUPPORTED +#define PNG_SETJMP_SUPPORTED +#define PNG_WRITE_FLUSH_SUPPORTED +#define PNG_MNG_FEATURES_SUPPORTED +#define PNG_FLOATING_POINT_SUPPORTED +#define PNG_INCH_CONVERSIONS_SUPPORTED +#define PNG_STDIO_SUPPORTED +#define PNG_READ_UNKNOWN_CHUNKS_SUPPORTED +#define PNG_USER_MEM_SUPPORTED +#define PNG_IO_STATE_SUPPORTED +#define PNG_SET_USER_LIMITS_SUPPORTED +#define PNG_READ_ANCILLARY_CHUNKS_SUPPORTED +#define PNG_WRITE_INT_FUNCTIONS_SUPPORTED +#define PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED +#define PNG_WRITE_FILTER_SUPPORTED +#define PNG_SET_CHUNK_CACHE_LIMIT_SUPPORTED +#define PNG_WRITE_iCCP_SUPPORTED +#define PNG_READ_TRANSFORMS_SUPPORTED +#define PNG_READ_GAMMA_SUPPORTED +#define PNG_READ_bKGD_SUPPORTED +#define PNG_UNKNOWN_CHUNKS_SUPPORTED +#define PNG_READ_sCAL_SUPPORTED +#define PNG_WRITE_hIST_SUPPORTED +#define PNG_READ_OPT_PLTE_SUPPORTED +#define PNG_SET_CHUNK_MALLOC_LIMIT_SUPPORTED +#define PNG_WRITE_gAMA_SUPPORTED +#define PNG_READ_GRAY_TO_RGB_SUPPORTED +#define PNG_WRITE_pCAL_SUPPORTED +#define PNG_READ_INVERT_ALPHA_SUPPORTED +#define PNG_WRITE_TRANSFORMS_SUPPORTED +#define PNG_READ_sBIT_SUPPORTED +#define PNG_READ_PACK_SUPPORTED +#define PNG_WRITE_SWAP_SUPPORTED +#define PNG_READ_cHRM_SUPPORTED +#define PNG_WRITE_tIME_SUPPORTED +#define PNG_READ_INTERLACING_SUPPORTED +#define PNG_READ_tRNS_SUPPORTED +#define PNG_WRITE_pHYs_SUPPORTED +#define PNG_WRITE_INVERT_SUPPORTED +#define PNG_READ_RGB_TO_GRAY_SUPPORTED +#define PNG_WRITE_sRGB_SUPPORTED +#define PNG_READ_oFFs_SUPPORTED +#define PNG_WRITE_FILLER_SUPPORTED +#define PNG_WRITE_TEXT_SUPPORTED +#define PNG_WRITE_SHIFT_SUPPORTED +#define PNG_PROGRESSIVE_READ_SUPPORTED +#define PNG_READ_SHIFT_SUPPORTED +#define PNG_CONVERT_tIME_SUPPORTED +#define PNG_READ_USER_TRANSFORM_SUPPORTED +#define PNG_READ_INT_FUNCTIONS_SUPPORTED +#define PNG_READ_USER_CHUNKS_SUPPORTED +#define PNG_READ_hIST_SUPPORTED +#define PNG_READ_16BIT_SUPPORTED +#define PNG_READ_SWAP_ALPHA_SUPPORTED +#define PNG_READ_COMPOSITE_NODIV_SUPPORTED +#define PNG_SEQUENTIAL_READ_SUPPORTED +#define PNG_READ_BACKGROUND_SUPPORTED +#define PNG_READ_QUANTIZE_SUPPORTED +#define PNG_READ_iCCP_SUPPORTED +#define PNG_READ_STRIP_ALPHA_SUPPORTED +#define PNG_READ_PACKSWAP_SUPPORTED +#define PNG_READ_sRGB_SUPPORTED +#define PNG_WRITE_tEXt_SUPPORTED +#define PNG_READ_gAMA_SUPPORTED +#define PNG_READ_pCAL_SUPPORTED +#define PNG_READ_EXPAND_SUPPORTED +#define PNG_WRITE_sPLT_SUPPORTED +#define PNG_READ_SWAP_SUPPORTED +#define PNG_READ_tIME_SUPPORTED +#define PNG_READ_pHYs_SUPPORTED +#define PNG_WRITE_SWAP_ALPHA_SUPPORTED +#define PNG_TIME_RFC1123_SUPPORTED +#define PNG_READ_TEXT_SUPPORTED +#define PNG_WRITE_BGR_SUPPORTED +#define PNG_USER_CHUNKS_SUPPORTED +#define PNG_CONSOLE_IO_SUPPORTED +#define PNG_WRITE_PACK_SUPPORTED +#define PNG_READ_FILLER_SUPPORTED +#define PNG_WRITE_bKGD_SUPPORTED +#define PNG_WRITE_tRNS_SUPPORTED +#define PNG_READ_sPLT_SUPPORTED +#define PNG_WRITE_sCAL_SUPPORTED +#define PNG_WRITE_oFFs_SUPPORTED +#define PNG_READ_tEXt_SUPPORTED +#define PNG_WRITE_sBIT_SUPPORTED +#define PNG_READ_INVERT_SUPPORTED +#define PNG_READ_16_TO_8_SUPPORTED +#define PNG_WRITE_cHRM_SUPPORTED +#define PNG_16BIT_SUPPORTED +#define PNG_WRITE_USER_TRANSFORM_SUPPORTED +#define PNG_READ_BGR_SUPPORTED +#define PNG_WRITE_PACKSWAP_SUPPORTED +#define PNG_WRITE_INVERT_ALPHA_SUPPORTED +#define PNG_sCAL_SUPPORTED +#define PNG_WRITE_zTXt_SUPPORTED +#define PNG_USER_TRANSFORM_INFO_SUPPORTED +#define PNG_sBIT_SUPPORTED +#define PNG_cHRM_SUPPORTED +#define PNG_bKGD_SUPPORTED +#define PNG_tRNS_SUPPORTED +#define PNG_WRITE_iTXt_SUPPORTED +#define PNG_oFFs_SUPPORTED +#define PNG_USER_TRANSFORM_PTR_SUPPORTED +#define PNG_hIST_SUPPORTED +#define PNG_iCCP_SUPPORTED +#define PNG_sRGB_SUPPORTED +#define PNG_READ_zTXt_SUPPORTED +#define PNG_gAMA_SUPPORTED +#define PNG_pCAL_SUPPORTED +#define PNG_CHECK_cHRM_SUPPORTED +#define PNG_tIME_SUPPORTED +#define PNG_pHYs_SUPPORTED +#define PNG_READ_iTXt_SUPPORTED +#define PNG_TEXT_SUPPORTED +#define PNG_SAVE_INT_32_SUPPORTED +#define PNG_sPLT_SUPPORTED +#define PNG_tEXt_SUPPORTED +#define PNG_zTXt_SUPPORTED +#define PNG_iTXt_SUPPORTED +/* end of options */ +#endif /* PNGLCONF_H */ diff --git a/programs/develop/libraries/libpng/pngmem.c b/programs/develop/libraries/libpng/pngmem.c new file mode 100644 index 0000000000..a15d8b0859 --- /dev/null +++ b/programs/develop/libraries/libpng/pngmem.c @@ -0,0 +1,658 @@ + +/* pngmem.c - stub functions for memory allocation + * + * Last changed in libpng 1.5.1 [February 3, 2011] + * Copyright (c) 1998-2011 Glenn Randers-Pehrson + * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) + * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) + * + * This code is released under the libpng license. + * For conditions of distribution and use, see the disclaimer + * and license in png.h + * + * This file provides a location for all memory allocation. Users who + * need special memory handling are expected to supply replacement + * functions for png_malloc() and png_free(), and to use + * png_create_read_struct_2() and png_create_write_struct_2() to + * identify the replacement functions. + */ + +#include "pngpriv.h" + +#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) + +/* Borland DOS special memory handler */ +#if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__) +/* If you change this, be sure to change the one in png.h also */ + +/* Allocate memory for a png_struct. The malloc and memset can be replaced + by a single call to calloc() if this is thought to improve performance. */ +PNG_FUNCTION(png_voidp /* PRIVATE */, +png_create_struct,(int type),PNG_ALLOCATED) +{ +# ifdef PNG_USER_MEM_SUPPORTED + return (png_create_struct_2(type, NULL, NULL)); +} + +/* Alternate version of png_create_struct, for use with user-defined malloc. */ +PNG_FUNCTION(png_voidp /* PRIVATE */, +png_create_struct_2,(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr), + PNG_ALLOCATED) +{ +# endif /* PNG_USER_MEM_SUPPORTED */ + png_size_t size; + png_voidp struct_ptr; + + if (type == PNG_STRUCT_INFO) + size = png_sizeof(png_info); + + else if (type == PNG_STRUCT_PNG) + size = png_sizeof(png_struct); + + else + return (png_get_copyright(NULL)); + +# ifdef PNG_USER_MEM_SUPPORTED + if (malloc_fn != NULL) + { + png_struct dummy_struct; + png_structp png_ptr = &dummy_struct; + png_ptr->mem_ptr=mem_ptr; + struct_ptr = (*(malloc_fn))(png_ptr, (png_uint_32)size); + } + + else +# endif /* PNG_USER_MEM_SUPPORTED */ + struct_ptr = (png_voidp)farmalloc(size); + if (struct_ptr != NULL) + png_memset(struct_ptr, 0, size); + + return (struct_ptr); +} + +/* Free memory allocated by a png_create_struct() call */ +void /* PRIVATE */ +png_destroy_struct(png_voidp struct_ptr) +{ +# ifdef PNG_USER_MEM_SUPPORTED + png_destroy_struct_2(struct_ptr, NULL, NULL); +} + +/* Free memory allocated by a png_create_struct() call */ +void /* PRIVATE */ +png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn, + png_voidp mem_ptr) +{ +# endif + if (struct_ptr != NULL) + { +# ifdef PNG_USER_MEM_SUPPORTED + if (free_fn != NULL) + { + png_struct dummy_struct; + png_structp png_ptr = &dummy_struct; + png_ptr->mem_ptr=mem_ptr; + (*(free_fn))(png_ptr, struct_ptr); + return; + } + +# endif /* PNG_USER_MEM_SUPPORTED */ + farfree (struct_ptr); + } +} + +/* Allocate memory. For reasonable files, size should never exceed + * 64K. However, zlib may allocate more then 64K if you don't tell + * it not to. See zconf.h and png.h for more information. zlib does + * need to allocate exactly 64K, so whatever you call here must + * have the ability to do that. + * + * Borland seems to have a problem in DOS mode for exactly 64K. + * It gives you a segment with an offset of 8 (perhaps to store its + * memory stuff). zlib doesn't like this at all, so we have to + * detect and deal with it. This code should not be needed in + * Windows or OS/2 modes, and only in 16 bit mode. This code has + * been updated by Alexander Lehmann for version 0.89 to waste less + * memory. + * + * Note that we can't use png_size_t for the "size" declaration, + * since on some systems a png_size_t is a 16-bit quantity, and as a + * result, we would be truncating potentially larger memory requests + * (which should cause a fatal error) and introducing major problems. + */ +PNG_FUNCTION(png_voidp,PNGAPI +png_calloc,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED) +{ + png_voidp ret; + + ret = (png_malloc(png_ptr, size)); + + if (ret != NULL) + png_memset(ret,0,(png_size_t)size); + + return (ret); +} + +PNG_FUNCTION(png_voidp,PNGAPI +png_malloc,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED) +{ + png_voidp ret; + + if (png_ptr == NULL || size == 0) + return (NULL); + +# ifdef PNG_USER_MEM_SUPPORTED + if (png_ptr->malloc_fn != NULL) + ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, (png_size_t)size)); + + else + ret = (png_malloc_default(png_ptr, size)); + + if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0) + png_error(png_ptr, "Out of memory"); + + return (ret); +} + +PNG_FUNCTION(png_voidp,PNGAPI +png_malloc_default,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED) +{ + png_voidp ret; +# endif /* PNG_USER_MEM_SUPPORTED */ + + if (png_ptr == NULL || size == 0) + return (NULL); + +# ifdef PNG_MAX_MALLOC_64K + if (size > (png_uint_32)65536L) + { + png_warning(png_ptr, "Cannot Allocate > 64K"); + ret = NULL; + } + + else +# endif + + if (size != (size_t)size) + ret = NULL; + + else if (size == (png_uint_32)65536L) + { + if (png_ptr->offset_table == NULL) + { + /* Try to see if we need to do any of this fancy stuff */ + ret = farmalloc(size); + if (ret == NULL || ((png_size_t)ret & 0xffff)) + { + int num_blocks; + png_uint_32 total_size; + png_bytep table; + int i; + png_byte huge * hptr; + + if (ret != NULL) + { + farfree(ret); + ret = NULL; + } + + if (png_ptr->zlib_window_bits > 14) + num_blocks = (int)(1 << (png_ptr->zlib_window_bits - 14)); + + else + num_blocks = 1; + + if (png_ptr->zlib_mem_level >= 7) + num_blocks += (int)(1 << (png_ptr->zlib_mem_level - 7)); + + else + num_blocks++; + + total_size = ((png_uint_32)65536L) * (png_uint_32)num_blocks+16; + + table = farmalloc(total_size); + + if (table == NULL) + { +# ifndef PNG_USER_MEM_SUPPORTED + if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0) + png_error(png_ptr, "Out Of Memory"); /* Note "O", "M" */ + + else + png_warning(png_ptr, "Out Of Memory"); +# endif + return (NULL); + } + + if ((png_size_t)table & 0xfff0) + { +# ifndef PNG_USER_MEM_SUPPORTED + if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0) + png_error(png_ptr, + "Farmalloc didn't return normalized pointer"); + + else + png_warning(png_ptr, + "Farmalloc didn't return normalized pointer"); +# endif + return (NULL); + } + + png_ptr->offset_table = table; + png_ptr->offset_table_ptr = farmalloc(num_blocks * + png_sizeof(png_bytep)); + + if (png_ptr->offset_table_ptr == NULL) + { +# ifndef PNG_USER_MEM_SUPPORTED + if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0) + png_error(png_ptr, "Out Of memory"); /* Note "O", "m" */ + + else + png_warning(png_ptr, "Out Of memory"); +# endif + return (NULL); + } + + hptr = (png_byte huge *)table; + if ((png_size_t)hptr & 0xf) + { + hptr = (png_byte huge *)((long)(hptr) & 0xfffffff0L); + hptr = hptr + 16L; /* "hptr += 16L" fails on Turbo C++ 3.0 */ + } + + for (i = 0; i < num_blocks; i++) + { + png_ptr->offset_table_ptr[i] = (png_bytep)hptr; + hptr = hptr + (png_uint_32)65536L; /* "+=" fails on TC++3.0 */ + } + + png_ptr->offset_table_number = num_blocks; + png_ptr->offset_table_count = 0; + png_ptr->offset_table_count_free = 0; + } + } + + if (png_ptr->offset_table_count >= png_ptr->offset_table_number) + { +# ifndef PNG_USER_MEM_SUPPORTED + if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0) + png_error(png_ptr, "Out of Memory"); /* Note "o" and "M" */ + + else + png_warning(png_ptr, "Out of Memory"); +# endif + return (NULL); + } + + ret = png_ptr->offset_table_ptr[png_ptr->offset_table_count++]; + } + + else + ret = farmalloc(size); + +# ifndef PNG_USER_MEM_SUPPORTED + if (ret == NULL) + { + if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0) + png_error(png_ptr, "Out of memory"); /* Note "o" and "m" */ + + else + png_warning(png_ptr, "Out of memory"); /* Note "o" and "m" */ + } +# endif + + return (ret); +} + +/* Free a pointer allocated by png_malloc(). In the default + * configuration, png_ptr is not used, but is passed in case it + * is needed. If ptr is NULL, return without taking any action. + */ +void PNGAPI +png_free(png_structp png_ptr, png_voidp ptr) +{ + if (png_ptr == NULL || ptr == NULL) + return; + +# ifdef PNG_USER_MEM_SUPPORTED + if (png_ptr->free_fn != NULL) + { + (*(png_ptr->free_fn))(png_ptr, ptr); + return; + } + + else + png_free_default(png_ptr, ptr); +} + +void PNGAPI +png_free_default(png_structp png_ptr, png_voidp ptr) +{ +# endif /* PNG_USER_MEM_SUPPORTED */ + + if (png_ptr == NULL || ptr == NULL) + return; + + if (png_ptr->offset_table != NULL) + { + int i; + + for (i = 0; i < png_ptr->offset_table_count; i++) + { + if (ptr == png_ptr->offset_table_ptr[i]) + { + ptr = NULL; + png_ptr->offset_table_count_free++; + break; + } + } + if (png_ptr->offset_table_count_free == png_ptr->offset_table_count) + { + farfree(png_ptr->offset_table); + farfree(png_ptr->offset_table_ptr); + png_ptr->offset_table = NULL; + png_ptr->offset_table_ptr = NULL; + } + } + + if (ptr != NULL) + farfree(ptr); +} + +#else /* Not the Borland DOS special memory handler */ + +/* Allocate memory for a png_struct or a png_info. The malloc and + memset can be replaced by a single call to calloc() if this is thought + to improve performance noticably. */ +PNG_FUNCTION(png_voidp /* PRIVATE */, +png_create_struct,(int type),PNG_ALLOCATED) +{ +# ifdef PNG_USER_MEM_SUPPORTED + return (png_create_struct_2(type, NULL, NULL)); +} + +/* Allocate memory for a png_struct or a png_info. The malloc and + memset can be replaced by a single call to calloc() if this is thought + to improve performance noticably. */ +PNG_FUNCTION(png_voidp /* PRIVATE */, +png_create_struct_2,(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr), + PNG_ALLOCATED) +{ +# endif /* PNG_USER_MEM_SUPPORTED */ + png_size_t size; + png_voidp struct_ptr; + + if (type == PNG_STRUCT_INFO) + size = png_sizeof(png_info); + + else if (type == PNG_STRUCT_PNG) + size = png_sizeof(png_struct); + + else + return (NULL); + +# ifdef PNG_USER_MEM_SUPPORTED + if (malloc_fn != NULL) + { + png_struct dummy_struct; + png_structp png_ptr = &dummy_struct; + png_ptr->mem_ptr=mem_ptr; + struct_ptr = (*(malloc_fn))(png_ptr, size); + + if (struct_ptr != NULL) + png_memset(struct_ptr, 0, size); + + return (struct_ptr); + } +# endif /* PNG_USER_MEM_SUPPORTED */ + +# if defined(__TURBOC__) && !defined(__FLAT__) + struct_ptr = (png_voidp)farmalloc(size); +# else +# if defined(_MSC_VER) && defined(MAXSEG_64K) + struct_ptr = (png_voidp)halloc(size, 1); +# else + struct_ptr = (png_voidp)malloc(size); +# endif +# endif + + if (struct_ptr != NULL) + png_memset(struct_ptr, 0, size); + + return (struct_ptr); +} + + +/* Free memory allocated by a png_create_struct() call */ +void /* PRIVATE */ +png_destroy_struct(png_voidp struct_ptr) +{ +# ifdef PNG_USER_MEM_SUPPORTED + png_destroy_struct_2(struct_ptr, NULL, NULL); +} + +/* Free memory allocated by a png_create_struct() call */ +void /* PRIVATE */ +png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn, + png_voidp mem_ptr) +{ +# endif /* PNG_USER_MEM_SUPPORTED */ + if (struct_ptr != NULL) + { +# ifdef PNG_USER_MEM_SUPPORTED + if (free_fn != NULL) + { + png_struct dummy_struct; + png_structp png_ptr = &dummy_struct; + png_ptr->mem_ptr=mem_ptr; + (*(free_fn))(png_ptr, struct_ptr); + return; + } +# endif /* PNG_USER_MEM_SUPPORTED */ +# if defined(__TURBOC__) && !defined(__FLAT__) + farfree(struct_ptr); + +# else +# if defined(_MSC_VER) && defined(MAXSEG_64K) + hfree(struct_ptr); + +# else + free(struct_ptr); + +# endif +# endif + } +} + +/* Allocate memory. For reasonable files, size should never exceed + * 64K. However, zlib may allocate more then 64K if you don't tell + * it not to. See zconf.h and png.h for more information. zlib does + * need to allocate exactly 64K, so whatever you call here must + * have the ability to do that. + */ + +PNG_FUNCTION(png_voidp,PNGAPI +png_calloc,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED) +{ + png_voidp ret; + + ret = (png_malloc(png_ptr, size)); + + if (ret != NULL) + png_memset(ret,0,(png_size_t)size); + + return (ret); +} + +PNG_FUNCTION(png_voidp,PNGAPI +png_malloc,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED) +{ + png_voidp ret; + +# ifdef PNG_USER_MEM_SUPPORTED + if (png_ptr == NULL || size == 0) + return (NULL); + + if (png_ptr->malloc_fn != NULL) + ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, (png_size_t)size)); + + else + ret = (png_malloc_default(png_ptr, size)); + + if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0) + png_error(png_ptr, "Out of Memory"); + + return (ret); +} + +PNG_FUNCTION(png_voidp,PNGAPI +png_malloc_default,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED) +{ + png_voidp ret; +# endif /* PNG_USER_MEM_SUPPORTED */ + + if (png_ptr == NULL || size == 0) + return (NULL); + +# ifdef PNG_MAX_MALLOC_64K + if (size > (png_uint_32)65536L) + { +# ifndef PNG_USER_MEM_SUPPORTED + if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0) + png_error(png_ptr, "Cannot Allocate > 64K"); + + else +# endif + return NULL; + } +# endif + + /* Check for overflow */ +# if defined(__TURBOC__) && !defined(__FLAT__) + + if (size != (unsigned long)size) + ret = NULL; + + else + ret = farmalloc(size); + +# else +# if defined(_MSC_VER) && defined(MAXSEG_64K) + if (size != (unsigned long)size) + ret = NULL; + + else + ret = halloc(size, 1); + +# else + if (size != (size_t)size) + ret = NULL; + + else + ret = malloc((size_t)size); +# endif +# endif + +# ifndef PNG_USER_MEM_SUPPORTED + if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0) + png_error(png_ptr, "Out of Memory"); +# endif + + return (ret); +} + +/* Free a pointer allocated by png_malloc(). If ptr is NULL, return + * without taking any action. + */ +void PNGAPI +png_free(png_structp png_ptr, png_voidp ptr) +{ + if (png_ptr == NULL || ptr == NULL) + return; + +# ifdef PNG_USER_MEM_SUPPORTED + if (png_ptr->free_fn != NULL) + { + (*(png_ptr->free_fn))(png_ptr, ptr); + return; + } + + else + png_free_default(png_ptr, ptr); +} + +void PNGAPI +png_free_default(png_structp png_ptr, png_voidp ptr) +{ + if (png_ptr == NULL || ptr == NULL) + return; + +# endif /* PNG_USER_MEM_SUPPORTED */ + +# if defined(__TURBOC__) && !defined(__FLAT__) + farfree(ptr); + +# else +# if defined(_MSC_VER) && defined(MAXSEG_64K) + hfree(ptr); + +# else + free(ptr); + +# endif +# endif +} +#endif /* Not Borland DOS special memory handler */ + +/* This function was added at libpng version 1.2.3. The png_malloc_warn() + * function will set up png_malloc() to issue a png_warning and return NULL + * instead of issuing a png_error, if it fails to allocate the requested + * memory. + */ +PNG_FUNCTION(png_voidp,PNGAPI +png_malloc_warn,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED) +{ + png_voidp ptr; + png_uint_32 save_flags; + if (png_ptr == NULL) + return (NULL); + + save_flags = png_ptr->flags; + png_ptr->flags|=PNG_FLAG_MALLOC_NULL_MEM_OK; + ptr = (png_voidp)png_malloc((png_structp)png_ptr, size); + png_ptr->flags=save_flags; + return(ptr); +} + + +#ifdef PNG_USER_MEM_SUPPORTED +/* This function is called when the application wants to use another method + * of allocating and freeing memory. + */ +void PNGAPI +png_set_mem_fn(png_structp png_ptr, png_voidp mem_ptr, png_malloc_ptr + malloc_fn, png_free_ptr free_fn) +{ + if (png_ptr != NULL) + { + png_ptr->mem_ptr = mem_ptr; + png_ptr->malloc_fn = malloc_fn; + png_ptr->free_fn = free_fn; + } +} + +/* This function returns a pointer to the mem_ptr associated with the user + * functions. The application should free any memory associated with this + * pointer before png_write_destroy and png_read_destroy are called. + */ +png_voidp PNGAPI +png_get_mem_ptr(png_const_structp png_ptr) +{ + if (png_ptr == NULL) + return (NULL); + + return ((png_voidp)png_ptr->mem_ptr); +} +#endif /* PNG_USER_MEM_SUPPORTED */ +#endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */ diff --git a/programs/develop/libraries/libpng/pngpread.c b/programs/develop/libraries/libpng/pngpread.c new file mode 100644 index 0000000000..7b1149bab1 --- /dev/null +++ b/programs/develop/libraries/libpng/pngpread.c @@ -0,0 +1,1854 @@ + +/* pngpread.c - read a png file in push mode + * + * Last changed in libpng 1.5.1 [February 3, 2011] + * Copyright (c) 1998-2011 Glenn Randers-Pehrson + * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) + * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) + * + * This code is released under the libpng license. + * For conditions of distribution and use, see the disclaimer + * and license in png.h + */ + +#include "pngpriv.h" + +#ifdef PNG_PROGRESSIVE_READ_SUPPORTED + +/* Push model modes */ +#define PNG_READ_SIG_MODE 0 +#define PNG_READ_CHUNK_MODE 1 +#define PNG_READ_IDAT_MODE 2 +#define PNG_SKIP_MODE 3 +#define PNG_READ_tEXt_MODE 4 +#define PNG_READ_zTXt_MODE 5 +#define PNG_READ_DONE_MODE 6 +#define PNG_READ_iTXt_MODE 7 +#define PNG_ERROR_MODE 8 + +void PNGAPI +png_process_data(png_structp png_ptr, png_infop info_ptr, + png_bytep buffer, png_size_t buffer_size) +{ + if (png_ptr == NULL || info_ptr == NULL) + return; + + png_push_restore_buffer(png_ptr, buffer, buffer_size); + + while (png_ptr->buffer_size) + { + png_process_some_data(png_ptr, info_ptr); + } +} + +png_size_t PNGAPI +png_process_data_pause(png_structp png_ptr, int save) +{ + if (png_ptr != NULL) + { + /* It's easiest for the caller if we do the save, then the caller doesn't + * have to supply the same data again: + */ + if (save) + png_push_save_buffer(png_ptr); + else + { + /* This includes any pending saved bytes: */ + png_size_t remaining = png_ptr->buffer_size; + png_ptr->buffer_size = 0; + + /* So subtract the saved buffer size, unless all the data + * is actually 'saved', in which case we just return 0 + */ + if (png_ptr->save_buffer_size < remaining) + return remaining - png_ptr->save_buffer_size; + } + } + + return 0; +} + +png_uint_32 PNGAPI +png_process_data_skip(png_structp png_ptr) +{ + png_uint_32 remaining = 0; + + if (png_ptr != NULL && png_ptr->process_mode == PNG_SKIP_MODE && + png_ptr->skip_length > 0) + { + /* At the end of png_process_data the buffer size must be 0 (see the loop + * above) so we can detect a broken call here: + */ + if (png_ptr->buffer_size != 0) + png_error(png_ptr, + "png_process_data_skip called inside png_process_data"); + + /* If is impossible for there to be a saved buffer at this point - + * otherwise we could not be in SKIP mode. This will also happen if + * png_process_skip is called inside png_process_data (but only very + * rarely.) + */ + if (png_ptr->save_buffer_size != 0) + png_error(png_ptr, "png_process_data_skip called with saved data"); + + remaining = png_ptr->skip_length; + png_ptr->skip_length = 0; + png_ptr->process_mode = PNG_READ_CHUNK_MODE; + } + + return remaining; +} + +/* What we do with the incoming data depends on what we were previously + * doing before we ran out of data... + */ +void /* PRIVATE */ +png_process_some_data(png_structp png_ptr, png_infop info_ptr) +{ + if (png_ptr == NULL) + return; + + switch (png_ptr->process_mode) + { + case PNG_READ_SIG_MODE: + { + png_push_read_sig(png_ptr, info_ptr); + break; + } + + case PNG_READ_CHUNK_MODE: + { + png_push_read_chunk(png_ptr, info_ptr); + break; + } + + case PNG_READ_IDAT_MODE: + { + png_push_read_IDAT(png_ptr); + break; + } + +#ifdef PNG_READ_tEXt_SUPPORTED + case PNG_READ_tEXt_MODE: + { + png_push_read_tEXt(png_ptr, info_ptr); + break; + } + +#endif +#ifdef PNG_READ_zTXt_SUPPORTED + case PNG_READ_zTXt_MODE: + { + png_push_read_zTXt(png_ptr, info_ptr); + break; + } + +#endif +#ifdef PNG_READ_iTXt_SUPPORTED + case PNG_READ_iTXt_MODE: + { + png_push_read_iTXt(png_ptr, info_ptr); + break; + } + +#endif + case PNG_SKIP_MODE: + { + png_push_crc_finish(png_ptr); + break; + } + + default: + { + png_ptr->buffer_size = 0; + break; + } + } +} + +/* Read any remaining signature bytes from the stream and compare them with + * the correct PNG signature. It is possible that this routine is called + * with bytes already read from the signature, either because they have been + * checked by the calling application, or because of multiple calls to this + * routine. + */ +void /* PRIVATE */ +png_push_read_sig(png_structp png_ptr, png_infop info_ptr) +{ + png_size_t num_checked = png_ptr->sig_bytes, + num_to_check = 8 - num_checked; + + if (png_ptr->buffer_size < num_to_check) + { + num_to_check = png_ptr->buffer_size; + } + + png_push_fill_buffer(png_ptr, &(info_ptr->signature[num_checked]), + num_to_check); + png_ptr->sig_bytes = (png_byte)(png_ptr->sig_bytes + num_to_check); + + if (png_sig_cmp(info_ptr->signature, num_checked, num_to_check)) + { + if (num_checked < 4 && + png_sig_cmp(info_ptr->signature, num_checked, num_to_check - 4)) + png_error(png_ptr, "Not a PNG file"); + + else + png_error(png_ptr, "PNG file corrupted by ASCII conversion"); + } + else + { + if (png_ptr->sig_bytes >= 8) + { + png_ptr->process_mode = PNG_READ_CHUNK_MODE; + } + } +} + +void /* PRIVATE */ +png_push_read_chunk(png_structp png_ptr, png_infop info_ptr) +{ + PNG_IHDR; + PNG_IDAT; + PNG_IEND; + PNG_PLTE; +#ifdef PNG_READ_bKGD_SUPPORTED + PNG_bKGD; +#endif +#ifdef PNG_READ_cHRM_SUPPORTED + PNG_cHRM; +#endif +#ifdef PNG_READ_gAMA_SUPPORTED + PNG_gAMA; +#endif +#ifdef PNG_READ_hIST_SUPPORTED + PNG_hIST; +#endif +#ifdef PNG_READ_iCCP_SUPPORTED + PNG_iCCP; +#endif +#ifdef PNG_READ_iTXt_SUPPORTED + PNG_iTXt; +#endif +#ifdef PNG_READ_oFFs_SUPPORTED + PNG_oFFs; +#endif +#ifdef PNG_READ_pCAL_SUPPORTED + PNG_pCAL; +#endif +#ifdef PNG_READ_pHYs_SUPPORTED + PNG_pHYs; +#endif +#ifdef PNG_READ_sBIT_SUPPORTED + PNG_sBIT; +#endif +#ifdef PNG_READ_sCAL_SUPPORTED + PNG_sCAL; +#endif +#ifdef PNG_READ_sRGB_SUPPORTED + PNG_sRGB; +#endif +#ifdef PNG_READ_sPLT_SUPPORTED + PNG_sPLT; +#endif +#ifdef PNG_READ_tEXt_SUPPORTED + PNG_tEXt; +#endif +#ifdef PNG_READ_tIME_SUPPORTED + PNG_tIME; +#endif +#ifdef PNG_READ_tRNS_SUPPORTED + PNG_tRNS; +#endif +#ifdef PNG_READ_zTXt_SUPPORTED + PNG_zTXt; +#endif + + /* First we make sure we have enough data for the 4 byte chunk name + * and the 4 byte chunk length before proceeding with decoding the + * chunk data. To fully decode each of these chunks, we also make + * sure we have enough data in the buffer for the 4 byte CRC at the + * end of every chunk (except IDAT, which is handled separately). + */ + if (!(png_ptr->mode & PNG_HAVE_CHUNK_HEADER)) + { + png_byte chunk_length[4]; + + if (png_ptr->buffer_size < 8) + { + png_push_save_buffer(png_ptr); + return; + } + + png_push_fill_buffer(png_ptr, chunk_length, 4); + png_ptr->push_length = png_get_uint_31(png_ptr, chunk_length); + png_reset_crc(png_ptr); + png_crc_read(png_ptr, png_ptr->chunk_name, 4); + png_check_chunk_name(png_ptr, png_ptr->chunk_name); + png_ptr->mode |= PNG_HAVE_CHUNK_HEADER; + } + + if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) + if (png_ptr->mode & PNG_AFTER_IDAT) + png_ptr->mode |= PNG_HAVE_CHUNK_AFTER_IDAT; + + if (!png_memcmp(png_ptr->chunk_name, png_IHDR, 4)) + { + if (png_ptr->push_length != 13) + png_error(png_ptr, "Invalid IHDR length"); + + if (png_ptr->push_length + 4 > png_ptr->buffer_size) + { + png_push_save_buffer(png_ptr); + return; + } + + png_handle_IHDR(png_ptr, info_ptr, png_ptr->push_length); + } + + else if (!png_memcmp(png_ptr->chunk_name, png_IEND, 4)) + { + if (png_ptr->push_length + 4 > png_ptr->buffer_size) + { + png_push_save_buffer(png_ptr); + return; + } + + png_handle_IEND(png_ptr, info_ptr, png_ptr->push_length); + + png_ptr->process_mode = PNG_READ_DONE_MODE; + png_push_have_end(png_ptr, info_ptr); + } + +#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED + else if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name)) + { + if (png_ptr->push_length + 4 > png_ptr->buffer_size) + { + png_push_save_buffer(png_ptr); + return; + } + + if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) + png_ptr->mode |= PNG_HAVE_IDAT; + + png_handle_unknown(png_ptr, info_ptr, png_ptr->push_length); + + if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4)) + png_ptr->mode |= PNG_HAVE_PLTE; + + else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) + { + if (!(png_ptr->mode & PNG_HAVE_IHDR)) + png_error(png_ptr, "Missing IHDR before IDAT"); + + else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE && + !(png_ptr->mode & PNG_HAVE_PLTE)) + png_error(png_ptr, "Missing PLTE before IDAT"); + } + } + +#endif + else if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4)) + { + if (png_ptr->push_length + 4 > png_ptr->buffer_size) + { + png_push_save_buffer(png_ptr); + return; + } + png_handle_PLTE(png_ptr, info_ptr, png_ptr->push_length); + } + + else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) + { + /* If we reach an IDAT chunk, this means we have read all of the + * header chunks, and we can start reading the image (or if this + * is called after the image has been read - we have an error). + */ + + if (!(png_ptr->mode & PNG_HAVE_IHDR)) + png_error(png_ptr, "Missing IHDR before IDAT"); + + else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE && + !(png_ptr->mode & PNG_HAVE_PLTE)) + png_error(png_ptr, "Missing PLTE before IDAT"); + + if (png_ptr->mode & PNG_HAVE_IDAT) + { + if (!(png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT)) + if (png_ptr->push_length == 0) + return; + + if (png_ptr->mode & PNG_AFTER_IDAT) + png_benign_error(png_ptr, "Too many IDATs found"); + } + + png_ptr->idat_size = png_ptr->push_length; + png_ptr->mode |= PNG_HAVE_IDAT; + png_ptr->process_mode = PNG_READ_IDAT_MODE; + png_push_have_info(png_ptr, info_ptr); + png_ptr->zstream.avail_out = + (uInt) PNG_ROWBYTES(png_ptr->pixel_depth, + png_ptr->iwidth) + 1; + png_ptr->zstream.next_out = png_ptr->row_buf; + return; + } + +#ifdef PNG_READ_gAMA_SUPPORTED + else if (!png_memcmp(png_ptr->chunk_name, png_gAMA, 4)) + { + if (png_ptr->push_length + 4 > png_ptr->buffer_size) + { + png_push_save_buffer(png_ptr); + return; + } + + png_handle_gAMA(png_ptr, info_ptr, png_ptr->push_length); + } + +#endif +#ifdef PNG_READ_sBIT_SUPPORTED + else if (!png_memcmp(png_ptr->chunk_name, png_sBIT, 4)) + { + if (png_ptr->push_length + 4 > png_ptr->buffer_size) + { + png_push_save_buffer(png_ptr); + return; + } + + png_handle_sBIT(png_ptr, info_ptr, png_ptr->push_length); + } + +#endif +#ifdef PNG_READ_cHRM_SUPPORTED + else if (!png_memcmp(png_ptr->chunk_name, png_cHRM, 4)) + { + if (png_ptr->push_length + 4 > png_ptr->buffer_size) + { + png_push_save_buffer(png_ptr); + return; + } + + png_handle_cHRM(png_ptr, info_ptr, png_ptr->push_length); + } + +#endif +#ifdef PNG_READ_sRGB_SUPPORTED + else if (!png_memcmp(png_ptr->chunk_name, png_sRGB, 4)) + { + if (png_ptr->push_length + 4 > png_ptr->buffer_size) + { + png_push_save_buffer(png_ptr); + return; + } + + png_handle_sRGB(png_ptr, info_ptr, png_ptr->push_length); + } + +#endif +#ifdef PNG_READ_iCCP_SUPPORTED + else if (!png_memcmp(png_ptr->chunk_name, png_iCCP, 4)) + { + if (png_ptr->push_length + 4 > png_ptr->buffer_size) + { + png_push_save_buffer(png_ptr); + return; + } + + png_handle_iCCP(png_ptr, info_ptr, png_ptr->push_length); + } + +#endif +#ifdef PNG_READ_sPLT_SUPPORTED + else if (!png_memcmp(png_ptr->chunk_name, png_sPLT, 4)) + { + if (png_ptr->push_length + 4 > png_ptr->buffer_size) + { + png_push_save_buffer(png_ptr); + return; + } + + png_handle_sPLT(png_ptr, info_ptr, png_ptr->push_length); + } + +#endif +#ifdef PNG_READ_tRNS_SUPPORTED + else if (!png_memcmp(png_ptr->chunk_name, png_tRNS, 4)) + { + if (png_ptr->push_length + 4 > png_ptr->buffer_size) + { + png_push_save_buffer(png_ptr); + return; + } + + png_handle_tRNS(png_ptr, info_ptr, png_ptr->push_length); + } + +#endif +#ifdef PNG_READ_bKGD_SUPPORTED + else if (!png_memcmp(png_ptr->chunk_name, png_bKGD, 4)) + { + if (png_ptr->push_length + 4 > png_ptr->buffer_size) + { + png_push_save_buffer(png_ptr); + return; + } + + png_handle_bKGD(png_ptr, info_ptr, png_ptr->push_length); + } + +#endif +#ifdef PNG_READ_hIST_SUPPORTED + else if (!png_memcmp(png_ptr->chunk_name, png_hIST, 4)) + { + if (png_ptr->push_length + 4 > png_ptr->buffer_size) + { + png_push_save_buffer(png_ptr); + return; + } + + png_handle_hIST(png_ptr, info_ptr, png_ptr->push_length); + } + +#endif +#ifdef PNG_READ_pHYs_SUPPORTED + else if (!png_memcmp(png_ptr->chunk_name, png_pHYs, 4)) + { + if (png_ptr->push_length + 4 > png_ptr->buffer_size) + { + png_push_save_buffer(png_ptr); + return; + } + + png_handle_pHYs(png_ptr, info_ptr, png_ptr->push_length); + } + +#endif +#ifdef PNG_READ_oFFs_SUPPORTED + else if (!png_memcmp(png_ptr->chunk_name, png_oFFs, 4)) + { + if (png_ptr->push_length + 4 > png_ptr->buffer_size) + { + png_push_save_buffer(png_ptr); + return; + } + + png_handle_oFFs(png_ptr, info_ptr, png_ptr->push_length); + } +#endif + +#ifdef PNG_READ_pCAL_SUPPORTED + else if (!png_memcmp(png_ptr->chunk_name, png_pCAL, 4)) + { + if (png_ptr->push_length + 4 > png_ptr->buffer_size) + { + png_push_save_buffer(png_ptr); + return; + } + + png_handle_pCAL(png_ptr, info_ptr, png_ptr->push_length); + } + +#endif +#ifdef PNG_READ_sCAL_SUPPORTED + else if (!png_memcmp(png_ptr->chunk_name, png_sCAL, 4)) + { + if (png_ptr->push_length + 4 > png_ptr->buffer_size) + { + png_push_save_buffer(png_ptr); + return; + } + + png_handle_sCAL(png_ptr, info_ptr, png_ptr->push_length); + } + +#endif +#ifdef PNG_READ_tIME_SUPPORTED + else if (!png_memcmp(png_ptr->chunk_name, png_tIME, 4)) + { + if (png_ptr->push_length + 4 > png_ptr->buffer_size) + { + png_push_save_buffer(png_ptr); + return; + } + + png_handle_tIME(png_ptr, info_ptr, png_ptr->push_length); + } + +#endif +#ifdef PNG_READ_tEXt_SUPPORTED + else if (!png_memcmp(png_ptr->chunk_name, png_tEXt, 4)) + { + if (png_ptr->push_length + 4 > png_ptr->buffer_size) + { + png_push_save_buffer(png_ptr); + return; + } + + png_push_handle_tEXt(png_ptr, info_ptr, png_ptr->push_length); + } + +#endif +#ifdef PNG_READ_zTXt_SUPPORTED + else if (!png_memcmp(png_ptr->chunk_name, png_zTXt, 4)) + { + if (png_ptr->push_length + 4 > png_ptr->buffer_size) + { + png_push_save_buffer(png_ptr); + return; + } + + png_push_handle_zTXt(png_ptr, info_ptr, png_ptr->push_length); + } + +#endif +#ifdef PNG_READ_iTXt_SUPPORTED + else if (!png_memcmp(png_ptr->chunk_name, png_iTXt, 4)) + { + if (png_ptr->push_length + 4 > png_ptr->buffer_size) + { + png_push_save_buffer(png_ptr); + return; + } + + png_push_handle_iTXt(png_ptr, info_ptr, png_ptr->push_length); + } + +#endif + else + { + if (png_ptr->push_length + 4 > png_ptr->buffer_size) + { + png_push_save_buffer(png_ptr); + return; + } + png_push_handle_unknown(png_ptr, info_ptr, png_ptr->push_length); + } + + png_ptr->mode &= ~PNG_HAVE_CHUNK_HEADER; +} + +void /* PRIVATE */ +png_push_crc_skip(png_structp png_ptr, png_uint_32 skip) +{ + png_ptr->process_mode = PNG_SKIP_MODE; + png_ptr->skip_length = skip; +} + +void /* PRIVATE */ +png_push_crc_finish(png_structp png_ptr) +{ + if (png_ptr->skip_length && png_ptr->save_buffer_size) + { + png_size_t save_size = png_ptr->save_buffer_size; + png_uint_32 skip_length = png_ptr->skip_length; + + /* We want the smaller of 'skip_length' and 'save_buffer_size', but + * they are of different types and we don't know which variable has the + * fewest bits. Carefully select the smaller and cast it to the type of + * the larger - this cannot overflow. Do not cast in the following test + * - it will break on either 16 or 64 bit platforms. + */ + if (skip_length < save_size) + save_size = (png_size_t)skip_length; + + else + skip_length = (png_uint_32)save_size; + + png_calculate_crc(png_ptr, png_ptr->save_buffer_ptr, save_size); + + png_ptr->skip_length -= skip_length; + png_ptr->buffer_size -= save_size; + png_ptr->save_buffer_size -= save_size; + png_ptr->save_buffer_ptr += save_size; + } + if (png_ptr->skip_length && png_ptr->current_buffer_size) + { + png_size_t save_size = png_ptr->current_buffer_size; + png_uint_32 skip_length = png_ptr->skip_length; + + /* We want the smaller of 'skip_length' and 'current_buffer_size', here, + * the same problem exists as above and the same solution. + */ + if (skip_length < save_size) + save_size = (png_size_t)skip_length; + + else + skip_length = (png_uint_32)save_size; + + png_calculate_crc(png_ptr, png_ptr->current_buffer_ptr, save_size); + + png_ptr->skip_length -= skip_length; + png_ptr->buffer_size -= save_size; + png_ptr->current_buffer_size -= save_size; + png_ptr->current_buffer_ptr += save_size; + } + if (!png_ptr->skip_length) + { + if (png_ptr->buffer_size < 4) + { + png_push_save_buffer(png_ptr); + return; + } + + png_crc_finish(png_ptr, 0); + png_ptr->process_mode = PNG_READ_CHUNK_MODE; + } +} + +void PNGCBAPI +png_push_fill_buffer(png_structp png_ptr, png_bytep buffer, png_size_t length) +{ + png_bytep ptr; + + if (png_ptr == NULL) + return; + + ptr = buffer; + if (png_ptr->save_buffer_size) + { + png_size_t save_size; + + if (length < png_ptr->save_buffer_size) + save_size = length; + + else + save_size = png_ptr->save_buffer_size; + + png_memcpy(ptr, png_ptr->save_buffer_ptr, save_size); + length -= save_size; + ptr += save_size; + png_ptr->buffer_size -= save_size; + png_ptr->save_buffer_size -= save_size; + png_ptr->save_buffer_ptr += save_size; + } + if (length && png_ptr->current_buffer_size) + { + png_size_t save_size; + + if (length < png_ptr->current_buffer_size) + save_size = length; + + else + save_size = png_ptr->current_buffer_size; + + png_memcpy(ptr, png_ptr->current_buffer_ptr, save_size); + png_ptr->buffer_size -= save_size; + png_ptr->current_buffer_size -= save_size; + png_ptr->current_buffer_ptr += save_size; + } +} + +void /* PRIVATE */ +png_push_save_buffer(png_structp png_ptr) +{ + if (png_ptr->save_buffer_size) + { + if (png_ptr->save_buffer_ptr != png_ptr->save_buffer) + { + png_size_t i, istop; + png_bytep sp; + png_bytep dp; + + istop = png_ptr->save_buffer_size; + for (i = 0, sp = png_ptr->save_buffer_ptr, dp = png_ptr->save_buffer; + i < istop; i++, sp++, dp++) + { + *dp = *sp; + } + } + } + if (png_ptr->save_buffer_size + png_ptr->current_buffer_size > + png_ptr->save_buffer_max) + { + png_size_t new_max; + png_bytep old_buffer; + + if (png_ptr->save_buffer_size > PNG_SIZE_MAX - + (png_ptr->current_buffer_size + 256)) + { + png_error(png_ptr, "Potential overflow of save_buffer"); + } + + new_max = png_ptr->save_buffer_size + png_ptr->current_buffer_size + 256; + old_buffer = png_ptr->save_buffer; + png_ptr->save_buffer = (png_bytep)png_malloc_warn(png_ptr, + (png_size_t)new_max); + + if (png_ptr->save_buffer == NULL) + { + png_free(png_ptr, old_buffer); + png_error(png_ptr, "Insufficient memory for save_buffer"); + } + + png_memcpy(png_ptr->save_buffer, old_buffer, png_ptr->save_buffer_size); + png_free(png_ptr, old_buffer); + png_ptr->save_buffer_max = new_max; + } + if (png_ptr->current_buffer_size) + { + png_memcpy(png_ptr->save_buffer + png_ptr->save_buffer_size, + png_ptr->current_buffer_ptr, png_ptr->current_buffer_size); + png_ptr->save_buffer_size += png_ptr->current_buffer_size; + png_ptr->current_buffer_size = 0; + } + png_ptr->save_buffer_ptr = png_ptr->save_buffer; + png_ptr->buffer_size = 0; +} + +void /* PRIVATE */ +png_push_restore_buffer(png_structp png_ptr, png_bytep buffer, + png_size_t buffer_length) +{ + png_ptr->current_buffer = buffer; + png_ptr->current_buffer_size = buffer_length; + png_ptr->buffer_size = buffer_length + png_ptr->save_buffer_size; + png_ptr->current_buffer_ptr = png_ptr->current_buffer; +} + +void /* PRIVATE */ +png_push_read_IDAT(png_structp png_ptr) +{ + PNG_IDAT; + if (!(png_ptr->mode & PNG_HAVE_CHUNK_HEADER)) + { + png_byte chunk_length[4]; + + if (png_ptr->buffer_size < 8) + { + png_push_save_buffer(png_ptr); + return; + } + + png_push_fill_buffer(png_ptr, chunk_length, 4); + png_ptr->push_length = png_get_uint_31(png_ptr, chunk_length); + png_reset_crc(png_ptr); + png_crc_read(png_ptr, png_ptr->chunk_name, 4); + png_ptr->mode |= PNG_HAVE_CHUNK_HEADER; + + if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) + { + png_ptr->process_mode = PNG_READ_CHUNK_MODE; + + if (!(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED)) + png_error(png_ptr, "Not enough compressed data"); + + return; + } + + png_ptr->idat_size = png_ptr->push_length; + } + if (png_ptr->idat_size && png_ptr->save_buffer_size) + { + png_size_t save_size = png_ptr->save_buffer_size; + png_uint_32 idat_size = png_ptr->idat_size; + + /* We want the smaller of 'idat_size' and 'current_buffer_size', but they + * are of different types and we don't know which variable has the fewest + * bits. Carefully select the smaller and cast it to the type of the + * larger - this cannot overflow. Do not cast in the following test - it + * will break on either 16 or 64 bit platforms. + */ + if (idat_size < save_size) + save_size = (png_size_t)idat_size; + + else + idat_size = (png_uint_32)save_size; + + png_calculate_crc(png_ptr, png_ptr->save_buffer_ptr, save_size); + + png_process_IDAT_data(png_ptr, png_ptr->save_buffer_ptr, save_size); + + png_ptr->idat_size -= idat_size; + png_ptr->buffer_size -= save_size; + png_ptr->save_buffer_size -= save_size; + png_ptr->save_buffer_ptr += save_size; + } + + if (png_ptr->idat_size && png_ptr->current_buffer_size) + { + png_size_t save_size = png_ptr->current_buffer_size; + png_uint_32 idat_size = png_ptr->idat_size; + + /* We want the smaller of 'idat_size' and 'current_buffer_size', but they + * are of different types and we don't know which variable has the fewest + * bits. Carefully select the smaller and cast it to the type of the + * larger - this cannot overflow. + */ + if (idat_size < save_size) + save_size = (png_size_t)idat_size; + + else + idat_size = (png_uint_32)save_size; + + png_calculate_crc(png_ptr, png_ptr->current_buffer_ptr, save_size); + + png_process_IDAT_data(png_ptr, png_ptr->current_buffer_ptr, save_size); + + png_ptr->idat_size -= idat_size; + png_ptr->buffer_size -= save_size; + png_ptr->current_buffer_size -= save_size; + png_ptr->current_buffer_ptr += save_size; + } + if (!png_ptr->idat_size) + { + if (png_ptr->buffer_size < 4) + { + png_push_save_buffer(png_ptr); + return; + } + + png_crc_finish(png_ptr, 0); + png_ptr->mode &= ~PNG_HAVE_CHUNK_HEADER; + png_ptr->mode |= PNG_AFTER_IDAT; + } +} + +void /* PRIVATE */ +png_process_IDAT_data(png_structp png_ptr, png_bytep buffer, + png_size_t buffer_length) +{ + /* The caller checks for a non-zero buffer length. */ + if (!(buffer_length > 0) || buffer == NULL) + png_error(png_ptr, "No IDAT data (internal error)"); + + /* This routine must process all the data it has been given + * before returning, calling the row callback as required to + * handle the uncompressed results. + */ + png_ptr->zstream.next_in = buffer; + png_ptr->zstream.avail_in = (uInt)buffer_length; + + /* Keep going until the decompressed data is all processed + * or the stream marked as finished. + */ + while (png_ptr->zstream.avail_in > 0 && + !(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED)) + { + int ret; + + /* We have data for zlib, but we must check that zlib + * has someplace to put the results. It doesn't matter + * if we don't expect any results -- it may be the input + * data is just the LZ end code. + */ + if (!(png_ptr->zstream.avail_out > 0)) + { + png_ptr->zstream.avail_out = + (uInt) PNG_ROWBYTES(png_ptr->pixel_depth, + png_ptr->iwidth) + 1; + + png_ptr->zstream.next_out = png_ptr->row_buf; + } + + /* Using Z_SYNC_FLUSH here means that an unterminated + * LZ stream (a stream with a missing end code) can still + * be handled, otherwise (Z_NO_FLUSH) a future zlib + * implementation might defer output and therefore + * change the current behavior (see comments in inflate.c + * for why this doesn't happen at present with zlib 1.2.5). + */ + ret = inflate(&png_ptr->zstream, Z_SYNC_FLUSH); + + /* Check for any failure before proceeding. */ + if (ret != Z_OK && ret != Z_STREAM_END) + { + /* Terminate the decompression. */ + png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED; + + /* This may be a truncated stream (missing or + * damaged end code). Treat that as a warning. + */ + if (png_ptr->row_number >= png_ptr->num_rows || + png_ptr->pass > 6) + png_warning(png_ptr, "Truncated compressed data in IDAT"); + + else + png_error(png_ptr, "Decompression error in IDAT"); + + /* Skip the check on unprocessed input */ + return; + } + + /* Did inflate output any data? */ + if (png_ptr->zstream.next_out != png_ptr->row_buf) + { + /* Is this unexpected data after the last row? + * If it is, artificially terminate the LZ output + * here. + */ + if (png_ptr->row_number >= png_ptr->num_rows || + png_ptr->pass > 6) + { + /* Extra data. */ + png_warning(png_ptr, "Extra compressed data in IDAT"); + png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED; + + /* Do no more processing; skip the unprocessed + * input check below. + */ + return; + } + + /* Do we have a complete row? */ + if (png_ptr->zstream.avail_out == 0) + png_push_process_row(png_ptr); + } + + /* And check for the end of the stream. */ + if (ret == Z_STREAM_END) + png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED; + } + + /* All the data should have been processed, if anything + * is left at this point we have bytes of IDAT data + * after the zlib end code. + */ + if (png_ptr->zstream.avail_in > 0) + png_warning(png_ptr, "Extra compression data in IDAT"); +} + +void /* PRIVATE */ +png_push_process_row(png_structp png_ptr) +{ + png_ptr->row_info.color_type = png_ptr->color_type; + png_ptr->row_info.width = png_ptr->iwidth; + png_ptr->row_info.channels = png_ptr->channels; + png_ptr->row_info.bit_depth = png_ptr->bit_depth; + png_ptr->row_info.pixel_depth = png_ptr->pixel_depth; + + png_ptr->row_info.rowbytes = PNG_ROWBYTES(png_ptr->row_info.pixel_depth, + png_ptr->row_info.width); + + png_read_filter_row(png_ptr, &(png_ptr->row_info), + png_ptr->row_buf + 1, png_ptr->prev_row + 1, + (int)(png_ptr->row_buf[0])); + + png_memcpy(png_ptr->prev_row, png_ptr->row_buf, png_ptr->rowbytes + 1); + + if (png_ptr->transformations || (png_ptr->flags&PNG_FLAG_STRIP_ALPHA)) + png_do_read_transformations(png_ptr); + +#ifdef PNG_READ_INTERLACING_SUPPORTED + /* Blow up interlaced rows to full size */ + if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE)) + { + if (png_ptr->pass < 6) +/* old interface (pre-1.0.9): + png_do_read_interlace(&(png_ptr->row_info), + png_ptr->row_buf + 1, png_ptr->pass, png_ptr->transformations); + */ + png_do_read_interlace(png_ptr); + + switch (png_ptr->pass) + { + case 0: + { + int i; + for (i = 0; i < 8 && png_ptr->pass == 0; i++) + { + png_push_have_row(png_ptr, png_ptr->row_buf + 1); + png_read_push_finish_row(png_ptr); /* Updates png_ptr->pass */ + } + + if (png_ptr->pass == 2) /* Pass 1 might be empty */ + { + for (i = 0; i < 4 && png_ptr->pass == 2; i++) + { + png_push_have_row(png_ptr, NULL); + png_read_push_finish_row(png_ptr); + } + } + + if (png_ptr->pass == 4 && png_ptr->height <= 4) + { + for (i = 0; i < 2 && png_ptr->pass == 4; i++) + { + png_push_have_row(png_ptr, NULL); + png_read_push_finish_row(png_ptr); + } + } + + if (png_ptr->pass == 6 && png_ptr->height <= 4) + { + png_push_have_row(png_ptr, NULL); + png_read_push_finish_row(png_ptr); + } + + break; + } + + case 1: + { + int i; + for (i = 0; i < 8 && png_ptr->pass == 1; i++) + { + png_push_have_row(png_ptr, png_ptr->row_buf + 1); + png_read_push_finish_row(png_ptr); + } + + if (png_ptr->pass == 2) /* Skip top 4 generated rows */ + { + for (i = 0; i < 4 && png_ptr->pass == 2; i++) + { + png_push_have_row(png_ptr, NULL); + png_read_push_finish_row(png_ptr); + } + } + + break; + } + + case 2: + { + int i; + + for (i = 0; i < 4 && png_ptr->pass == 2; i++) + { + png_push_have_row(png_ptr, png_ptr->row_buf + 1); + png_read_push_finish_row(png_ptr); + } + + for (i = 0; i < 4 && png_ptr->pass == 2; i++) + { + png_push_have_row(png_ptr, NULL); + png_read_push_finish_row(png_ptr); + } + + if (png_ptr->pass == 4) /* Pass 3 might be empty */ + { + for (i = 0; i < 2 && png_ptr->pass == 4; i++) + { + png_push_have_row(png_ptr, NULL); + png_read_push_finish_row(png_ptr); + } + } + + break; + } + + case 3: + { + int i; + + for (i = 0; i < 4 && png_ptr->pass == 3; i++) + { + png_push_have_row(png_ptr, png_ptr->row_buf + 1); + png_read_push_finish_row(png_ptr); + } + + if (png_ptr->pass == 4) /* Skip top two generated rows */ + { + for (i = 0; i < 2 && png_ptr->pass == 4; i++) + { + png_push_have_row(png_ptr, NULL); + png_read_push_finish_row(png_ptr); + } + } + + break; + } + + case 4: + { + int i; + + for (i = 0; i < 2 && png_ptr->pass == 4; i++) + { + png_push_have_row(png_ptr, png_ptr->row_buf + 1); + png_read_push_finish_row(png_ptr); + } + + for (i = 0; i < 2 && png_ptr->pass == 4; i++) + { + png_push_have_row(png_ptr, NULL); + png_read_push_finish_row(png_ptr); + } + + if (png_ptr->pass == 6) /* Pass 5 might be empty */ + { + png_push_have_row(png_ptr, NULL); + png_read_push_finish_row(png_ptr); + } + + break; + } + + case 5: + { + int i; + + for (i = 0; i < 2 && png_ptr->pass == 5; i++) + { + png_push_have_row(png_ptr, png_ptr->row_buf + 1); + png_read_push_finish_row(png_ptr); + } + + if (png_ptr->pass == 6) /* Skip top generated row */ + { + png_push_have_row(png_ptr, NULL); + png_read_push_finish_row(png_ptr); + } + + break; + } + + default: + case 6: + { + png_push_have_row(png_ptr, png_ptr->row_buf + 1); + png_read_push_finish_row(png_ptr); + + if (png_ptr->pass != 6) + break; + + png_push_have_row(png_ptr, NULL); + png_read_push_finish_row(png_ptr); + } + } + } + else +#endif + { + png_push_have_row(png_ptr, png_ptr->row_buf + 1); + png_read_push_finish_row(png_ptr); + } +} + +void /* PRIVATE */ +png_read_push_finish_row(png_structp png_ptr) +{ + /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */ + + /* Start of interlace block */ + PNG_CONST int FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0}; + + /* Offset to next interlace block */ + PNG_CONST int FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1}; + + /* Start of interlace block in the y direction */ + PNG_CONST int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1}; + + /* Offset to next interlace block in the y direction */ + PNG_CONST int FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2}; + + /* Height of interlace block. This is not currently used - if you need + * it, uncomment it here and in png.h + PNG_CONST int FARDATA png_pass_height[] = {8, 8, 4, 4, 2, 2, 1}; + */ + + png_ptr->row_number++; + if (png_ptr->row_number < png_ptr->num_rows) + return; + +#ifdef PNG_READ_INTERLACING_SUPPORTED + if (png_ptr->interlaced) + { + png_ptr->row_number = 0; + png_memset(png_ptr->prev_row, 0, png_ptr->rowbytes + 1); + + do + { + png_ptr->pass++; + if ((png_ptr->pass == 1 && png_ptr->width < 5) || + (png_ptr->pass == 3 && png_ptr->width < 3) || + (png_ptr->pass == 5 && png_ptr->width < 2)) + png_ptr->pass++; + + if (png_ptr->pass > 7) + png_ptr->pass--; + + if (png_ptr->pass >= 7) + break; + + png_ptr->iwidth = (png_ptr->width + + png_pass_inc[png_ptr->pass] - 1 - + png_pass_start[png_ptr->pass]) / + png_pass_inc[png_ptr->pass]; + + if (png_ptr->transformations & PNG_INTERLACE) + break; + + png_ptr->num_rows = (png_ptr->height + + png_pass_yinc[png_ptr->pass] - 1 - + png_pass_ystart[png_ptr->pass]) / + png_pass_yinc[png_ptr->pass]; + + } while (png_ptr->iwidth == 0 || png_ptr->num_rows == 0); + } +#endif /* PNG_READ_INTERLACING_SUPPORTED */ +} + +#ifdef PNG_READ_tEXt_SUPPORTED +void /* PRIVATE */ +png_push_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 + length) +{ + if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND)) + { + PNG_UNUSED(info_ptr) /* To quiet some compiler warnings */ + png_error(png_ptr, "Out of place tEXt"); + /*NOT REACHED*/ + } + +#ifdef PNG_MAX_MALLOC_64K + png_ptr->skip_length = 0; /* This may not be necessary */ + + if (length > (png_uint_32)65535L) /* Can't hold entire string in memory */ + { + png_warning(png_ptr, "tEXt chunk too large to fit in memory"); + png_ptr->skip_length = length - (png_uint_32)65535L; + length = (png_uint_32)65535L; + } +#endif + + png_ptr->current_text = (png_charp)png_malloc(png_ptr, + (png_size_t)(length + 1)); + png_ptr->current_text[length] = '\0'; + png_ptr->current_text_ptr = png_ptr->current_text; + png_ptr->current_text_size = (png_size_t)length; + png_ptr->current_text_left = (png_size_t)length; + png_ptr->process_mode = PNG_READ_tEXt_MODE; +} + +void /* PRIVATE */ +png_push_read_tEXt(png_structp png_ptr, png_infop info_ptr) +{ + if (png_ptr->buffer_size && png_ptr->current_text_left) + { + png_size_t text_size; + + if (png_ptr->buffer_size < png_ptr->current_text_left) + text_size = png_ptr->buffer_size; + + else + text_size = png_ptr->current_text_left; + + png_crc_read(png_ptr, (png_bytep)png_ptr->current_text_ptr, text_size); + png_ptr->current_text_left -= text_size; + png_ptr->current_text_ptr += text_size; + } + if (!(png_ptr->current_text_left)) + { + png_textp text_ptr; + png_charp text; + png_charp key; + int ret; + + if (png_ptr->buffer_size < 4) + { + png_push_save_buffer(png_ptr); + return; + } + + png_push_crc_finish(png_ptr); + +#ifdef PNG_MAX_MALLOC_64K + if (png_ptr->skip_length) + return; +#endif + + key = png_ptr->current_text; + + for (text = key; *text; text++) + /* Empty loop */ ; + + if (text < key + png_ptr->current_text_size) + text++; + + text_ptr = (png_textp)png_malloc(png_ptr, png_sizeof(png_text)); + text_ptr->compression = PNG_TEXT_COMPRESSION_NONE; + text_ptr->key = key; + text_ptr->itxt_length = 0; + text_ptr->lang = NULL; + text_ptr->lang_key = NULL; + text_ptr->text = text; + + ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1); + + png_free(png_ptr, key); + png_free(png_ptr, text_ptr); + png_ptr->current_text = NULL; + + if (ret) + png_warning(png_ptr, "Insufficient memory to store text chunk"); + } +} +#endif + +#ifdef PNG_READ_zTXt_SUPPORTED +void /* PRIVATE */ +png_push_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 + length) +{ + if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND)) + { + PNG_UNUSED(info_ptr) /* To quiet some compiler warnings */ + png_error(png_ptr, "Out of place zTXt"); + /*NOT REACHED*/ + } + +#ifdef PNG_MAX_MALLOC_64K + /* We can't handle zTXt chunks > 64K, since we don't have enough space + * to be able to store the uncompressed data. Actually, the threshold + * is probably around 32K, but it isn't as definite as 64K is. + */ + if (length > (png_uint_32)65535L) + { + png_warning(png_ptr, "zTXt chunk too large to fit in memory"); + png_push_crc_skip(png_ptr, length); + return; + } +#endif + + png_ptr->current_text = (png_charp)png_malloc(png_ptr, + (png_size_t)(length + 1)); + png_ptr->current_text[length] = '\0'; + png_ptr->current_text_ptr = png_ptr->current_text; + png_ptr->current_text_size = (png_size_t)length; + png_ptr->current_text_left = (png_size_t)length; + png_ptr->process_mode = PNG_READ_zTXt_MODE; +} + +void /* PRIVATE */ +png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr) +{ + if (png_ptr->buffer_size && png_ptr->current_text_left) + { + png_size_t text_size; + + if (png_ptr->buffer_size < (png_uint_32)png_ptr->current_text_left) + text_size = png_ptr->buffer_size; + + else + text_size = png_ptr->current_text_left; + + png_crc_read(png_ptr, (png_bytep)png_ptr->current_text_ptr, text_size); + png_ptr->current_text_left -= text_size; + png_ptr->current_text_ptr += text_size; + } + if (!(png_ptr->current_text_left)) + { + png_textp text_ptr; + png_charp text; + png_charp key; + int ret; + png_size_t text_size, key_size; + + if (png_ptr->buffer_size < 4) + { + png_push_save_buffer(png_ptr); + return; + } + + png_push_crc_finish(png_ptr); + + key = png_ptr->current_text; + + for (text = key; *text; text++) + /* Empty loop */ ; + + /* zTXt can't have zero text */ + if (text >= key + png_ptr->current_text_size) + { + png_ptr->current_text = NULL; + png_free(png_ptr, key); + return; + } + + text++; + + if (*text != PNG_TEXT_COMPRESSION_zTXt) /* Check compression byte */ + { + png_ptr->current_text = NULL; + png_free(png_ptr, key); + return; + } + + text++; + + png_ptr->zstream.next_in = (png_bytep)text; + png_ptr->zstream.avail_in = (uInt)(png_ptr->current_text_size - + (text - key)); + png_ptr->zstream.next_out = png_ptr->zbuf; + png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; + + key_size = text - key; + text_size = 0; + text = NULL; + ret = Z_STREAM_END; + + while (png_ptr->zstream.avail_in) + { + ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH); + if (ret != Z_OK && ret != Z_STREAM_END) + { + inflateReset(&png_ptr->zstream); + png_ptr->zstream.avail_in = 0; + png_ptr->current_text = NULL; + png_free(png_ptr, key); + png_free(png_ptr, text); + return; + } + + if (!(png_ptr->zstream.avail_out) || ret == Z_STREAM_END) + { + if (text == NULL) + { + text = (png_charp)png_malloc(png_ptr, + (png_ptr->zbuf_size + - png_ptr->zstream.avail_out + key_size + 1)); + + png_memcpy(text + key_size, png_ptr->zbuf, + png_ptr->zbuf_size - png_ptr->zstream.avail_out); + + png_memcpy(text, key, key_size); + + text_size = key_size + png_ptr->zbuf_size - + png_ptr->zstream.avail_out; + + *(text + text_size) = '\0'; + } + + else + { + png_charp tmp; + + tmp = text; + text = (png_charp)png_malloc(png_ptr, text_size + + (png_ptr->zbuf_size + - png_ptr->zstream.avail_out + 1)); + + png_memcpy(text, tmp, text_size); + png_free(png_ptr, tmp); + + png_memcpy(text + text_size, png_ptr->zbuf, + png_ptr->zbuf_size - png_ptr->zstream.avail_out); + + text_size += png_ptr->zbuf_size - png_ptr->zstream.avail_out; + *(text + text_size) = '\0'; + } + + if (ret != Z_STREAM_END) + { + png_ptr->zstream.next_out = png_ptr->zbuf; + png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; + } + } + else + { + break; + } + + if (ret == Z_STREAM_END) + break; + } + + inflateReset(&png_ptr->zstream); + png_ptr->zstream.avail_in = 0; + + if (ret != Z_STREAM_END) + { + png_ptr->current_text = NULL; + png_free(png_ptr, key); + png_free(png_ptr, text); + return; + } + + png_ptr->current_text = NULL; + png_free(png_ptr, key); + key = text; + text += key_size; + + text_ptr = (png_textp)png_malloc(png_ptr, + png_sizeof(png_text)); + text_ptr->compression = PNG_TEXT_COMPRESSION_zTXt; + text_ptr->key = key; + text_ptr->itxt_length = 0; + text_ptr->lang = NULL; + text_ptr->lang_key = NULL; + text_ptr->text = text; + + ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1); + + png_free(png_ptr, key); + png_free(png_ptr, text_ptr); + + if (ret) + png_warning(png_ptr, "Insufficient memory to store text chunk"); + } +} +#endif + +#ifdef PNG_READ_iTXt_SUPPORTED +void /* PRIVATE */ +png_push_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 + length) +{ + if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND)) + { + PNG_UNUSED(info_ptr) /* To quiet some compiler warnings */ + png_error(png_ptr, "Out of place iTXt"); + /*NOT REACHED*/ + } + +#ifdef PNG_MAX_MALLOC_64K + png_ptr->skip_length = 0; /* This may not be necessary */ + + if (length > (png_uint_32)65535L) /* Can't hold entire string in memory */ + { + png_warning(png_ptr, "iTXt chunk too large to fit in memory"); + png_ptr->skip_length = length - (png_uint_32)65535L; + length = (png_uint_32)65535L; + } +#endif + + png_ptr->current_text = (png_charp)png_malloc(png_ptr, + (png_size_t)(length + 1)); + png_ptr->current_text[length] = '\0'; + png_ptr->current_text_ptr = png_ptr->current_text; + png_ptr->current_text_size = (png_size_t)length; + png_ptr->current_text_left = (png_size_t)length; + png_ptr->process_mode = PNG_READ_iTXt_MODE; +} + +void /* PRIVATE */ +png_push_read_iTXt(png_structp png_ptr, png_infop info_ptr) +{ + + if (png_ptr->buffer_size && png_ptr->current_text_left) + { + png_size_t text_size; + + if (png_ptr->buffer_size < png_ptr->current_text_left) + text_size = png_ptr->buffer_size; + + else + text_size = png_ptr->current_text_left; + + png_crc_read(png_ptr, (png_bytep)png_ptr->current_text_ptr, text_size); + png_ptr->current_text_left -= text_size; + png_ptr->current_text_ptr += text_size; + } + + if (!(png_ptr->current_text_left)) + { + png_textp text_ptr; + png_charp key; + int comp_flag; + png_charp lang; + png_charp lang_key; + png_charp text; + int ret; + + if (png_ptr->buffer_size < 4) + { + png_push_save_buffer(png_ptr); + return; + } + + png_push_crc_finish(png_ptr); + +#ifdef PNG_MAX_MALLOC_64K + if (png_ptr->skip_length) + return; +#endif + + key = png_ptr->current_text; + + for (lang = key; *lang; lang++) + /* Empty loop */ ; + + if (lang < key + png_ptr->current_text_size - 3) + lang++; + + comp_flag = *lang++; + lang++; /* Skip comp_type, always zero */ + + for (lang_key = lang; *lang_key; lang_key++) + /* Empty loop */ ; + + lang_key++; /* Skip NUL separator */ + + text=lang_key; + + if (lang_key < key + png_ptr->current_text_size - 1) + { + for (; *text; text++) + /* Empty loop */ ; + } + + if (text < key + png_ptr->current_text_size) + text++; + + text_ptr = (png_textp)png_malloc(png_ptr, + png_sizeof(png_text)); + + text_ptr->compression = comp_flag + 2; + text_ptr->key = key; + text_ptr->lang = lang; + text_ptr->lang_key = lang_key; + text_ptr->text = text; + text_ptr->text_length = 0; + text_ptr->itxt_length = png_strlen(text); + + ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1); + + png_ptr->current_text = NULL; + + png_free(png_ptr, text_ptr); + if (ret) + png_warning(png_ptr, "Insufficient memory to store iTXt chunk"); + } +} +#endif + +/* This function is called when we haven't found a handler for this + * chunk. If there isn't a problem with the chunk itself (ie a bad chunk + * name or a critical chunk), the chunk is (currently) silently ignored. + */ +void /* PRIVATE */ +png_push_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32 + length) +{ + png_uint_32 skip = 0; + + if (!(png_ptr->chunk_name[0] & 0x20)) + { +#ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED + if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name) != + PNG_HANDLE_CHUNK_ALWAYS +#ifdef PNG_READ_USER_CHUNKS_SUPPORTED + && png_ptr->read_user_chunk_fn == NULL +#endif + ) +#endif + png_chunk_error(png_ptr, "unknown critical chunk"); + + PNG_UNUSED(info_ptr) /* To quiet some compiler warnings */ + } + +#ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED + if (png_ptr->flags & PNG_FLAG_KEEP_UNKNOWN_CHUNKS) + { +#ifdef PNG_MAX_MALLOC_64K + if (length > (png_uint_32)65535L) + { + png_warning(png_ptr, "unknown chunk too large to fit in memory"); + skip = length - (png_uint_32)65535L; + length = (png_uint_32)65535L; + } +#endif + png_memcpy((png_charp)png_ptr->unknown_chunk.name, + (png_charp)png_ptr->chunk_name, + png_sizeof(png_ptr->unknown_chunk.name)); + png_ptr->unknown_chunk.name[png_sizeof(png_ptr->unknown_chunk.name) - 1] + = '\0'; + + png_ptr->unknown_chunk.size = (png_size_t)length; + + if (length == 0) + png_ptr->unknown_chunk.data = NULL; + + else + { + png_ptr->unknown_chunk.data = (png_bytep)png_malloc(png_ptr, + (png_size_t)length); + png_crc_read(png_ptr, (png_bytep)png_ptr->unknown_chunk.data, length); + } + +#ifdef PNG_READ_USER_CHUNKS_SUPPORTED + if (png_ptr->read_user_chunk_fn != NULL) + { + /* Callback to user unknown chunk handler */ + int ret; + ret = (*(png_ptr->read_user_chunk_fn)) + (png_ptr, &png_ptr->unknown_chunk); + + if (ret < 0) + png_chunk_error(png_ptr, "error in user chunk"); + + if (ret == 0) + { + if (!(png_ptr->chunk_name[0] & 0x20)) + if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name) != + PNG_HANDLE_CHUNK_ALWAYS) + png_chunk_error(png_ptr, "unknown critical chunk"); + png_set_unknown_chunks(png_ptr, info_ptr, + &png_ptr->unknown_chunk, 1); + } + } + + else +#endif + png_set_unknown_chunks(png_ptr, info_ptr, &png_ptr->unknown_chunk, 1); + png_free(png_ptr, png_ptr->unknown_chunk.data); + png_ptr->unknown_chunk.data = NULL; + } + + else +#endif + skip=length; + png_push_crc_skip(png_ptr, skip); +} + +void /* PRIVATE */ +png_push_have_info(png_structp png_ptr, png_infop info_ptr) +{ + if (png_ptr->info_fn != NULL) + (*(png_ptr->info_fn))(png_ptr, info_ptr); +} + +void /* PRIVATE */ +png_push_have_end(png_structp png_ptr, png_infop info_ptr) +{ + if (png_ptr->end_fn != NULL) + (*(png_ptr->end_fn))(png_ptr, info_ptr); +} + +void /* PRIVATE */ +png_push_have_row(png_structp png_ptr, png_bytep row) +{ + if (png_ptr->row_fn != NULL) + (*(png_ptr->row_fn))(png_ptr, row, png_ptr->row_number, + (int)png_ptr->pass); +} + +void PNGAPI +png_progressive_combine_row (png_structp png_ptr, png_bytep old_row, + png_const_bytep new_row) +{ + PNG_CONST int FARDATA png_pass_dsp_mask[7] = + {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff}; + + if (png_ptr == NULL) + return; + + if (new_row != NULL) /* new_row must == png_ptr->row_buf here. */ + png_combine_row(png_ptr, old_row, png_pass_dsp_mask[png_ptr->pass]); +} + +void PNGAPI +png_set_progressive_read_fn(png_structp png_ptr, png_voidp progressive_ptr, + png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn, + png_progressive_end_ptr end_fn) +{ + if (png_ptr == NULL) + return; + + png_ptr->info_fn = info_fn; + png_ptr->row_fn = row_fn; + png_ptr->end_fn = end_fn; + + png_set_read_fn(png_ptr, progressive_ptr, png_push_fill_buffer); +} + +png_voidp PNGAPI +png_get_progressive_ptr(png_const_structp png_ptr) +{ + if (png_ptr == NULL) + return (NULL); + + return png_ptr->io_ptr; +} +#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ diff --git a/programs/develop/libraries/libpng/pngpriv.h b/programs/develop/libraries/libpng/pngpriv.h new file mode 100644 index 0000000000..675608a6ff --- /dev/null +++ b/programs/develop/libraries/libpng/pngpriv.h @@ -0,0 +1,1235 @@ + +/* pngpriv.h - private declarations for use inside libpng + * + * For conditions of distribution and use, see copyright notice in png.h + * Copyright (c) 1998-2011 Glenn Randers-Pehrson + * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) + * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) + * + * Last changed in libpng 1.5.0 [January 6, 2011] + * + * This code is released under the libpng license. + * For conditions of distribution and use, see the disclaimer + * and license in png.h + */ + +/* The symbols declared in this file (including the functions declared + * as PNG_EXTERN) are PRIVATE. They are not part of the libpng public + * interface, and are not recommended for use by regular applications. + * Some of them may become public in the future; others may stay private, + * change in an incompatible way, or even disappear. + * Although the libpng users are not forbidden to include this header, + * they should be well aware of the issues that may arise from doing so. + */ + +#ifndef PNGPRIV_H +#define PNGPRIV_H + +/* This is required for the definition of abort(), used as a last ditch + * error handler when all else fails. + */ +#include + +#define PNGLIB_BUILD +#ifdef PNG_USER_CONFIG +# include "pngusr.h" + /* These should have been defined in pngusr.h */ +# ifndef PNG_USER_PRIVATEBUILD +# define PNG_USER_PRIVATEBUILD "Custom libpng build" +# endif +# ifndef PNG_USER_DLLFNAME_POSTFIX +# define PNG_USER_DLLFNAME_POSTFIX "Cb" +# endif +#endif +#include "png.h" +#include "pnginfo.h" +#include "pngstruct.h" + +/* This is used for 16 bit gamma tables - only the top level pointers are const, + * this could be changed: + */ +typedef PNG_CONST png_uint_16p FAR * png_const_uint_16pp; + +/* Added at libpng-1.2.9 */ +/* Moved to pngpriv.h at libpng-1.5.0 */ + +/* config.h is created by and PNG_CONFIGURE_LIBPNG is set by the "configure" + * script. We may need it here to get the correct configuration on things + * like limits. + */ +#ifdef PNG_CONFIGURE_LIBPNG +# ifdef HAVE_CONFIG_H +# include "config.h" +# endif +#endif + +/* Moved to pngpriv.h at libpng-1.5.0 */ +/* NOTE: some of these may have been used in external applications as + * these definitions were exposed in pngconf.h prior to 1.5. + */ + +/* If you are running on a machine where you cannot allocate more + * than 64K of memory at once, uncomment this. While libpng will not + * normally need that much memory in a chunk (unless you load up a very + * large file), zlib needs to know how big of a chunk it can use, and + * libpng thus makes sure to check any memory allocation to verify it + * will fit into memory. + * + * zlib provides 'MAXSEG_64K' which, if defined, indicates the + * same limit and pngconf.h (already included) sets the limit + * if certain operating systems are detected. + */ +#if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K) +# define PNG_MAX_MALLOC_64K +#endif + +/* Unused formal parameter warnings are silenced using the following macro + * which is expected to have no bad effects on performance (optimizing + * compilers will probably remove it entirely). Note that if you replace + * it with something other than whitespace, you must include the terminating + * semicolon. + */ +#define PNG_UNUSED(param) (void)param; + +/* Just a little check that someone hasn't tried to define something + * contradictory. + */ +#if (PNG_ZBUF_SIZE > 65536L) && defined(PNG_MAX_MALLOC_64K) +# undef PNG_ZBUF_SIZE +# define PNG_ZBUF_SIZE 65536L +#endif + +/* If warnings or errors are turned off the code is disabled + * or redirected here. + */ +#ifndef PNG_WARNINGS_SUPPORTED +# define png_warning(s1,s2) ((void)0) +# define png_chunk_warning(s1,s2) ((void)0) +#endif +#ifndef PNG_ERROR_TEXT_SUPPORTED +# define png_error(s1,s2) png_err(s1) +# define png_chunk_error(s1,s2) png_err(s1) +# define png_fixed_error(s1,s2) png_err(s1) +#endif + +#ifndef PNG_EXTERN +/* The functions exported by PNG_EXTERN are internal functions, which + * aren't usually used outside the library (as far as I know), so it is + * debatable if they should be exported at all. In the future, when it + * is possible to have run-time registry of chunk-handling functions, + * some of these might be made available again. +# define PNG_EXTERN extern + */ +# define PNG_EXTERN +#endif + +/* Some fixed point APIs are still required even if not exported because + * they get used by the corresponding floating point APIs. This magic + * deals with this: + */ +#ifdef PNG_FIXED_POINT_SUPPORTED +# define PNGFAPI PNGAPI +#else +# define PNGFAPI /* PRIVATE */ +#endif + +/* Other defines specific to compilers can go here. Try to keep + * them inside an appropriate ifdef/endif pair for portability. + */ +#if defined(PNG_FLOATING_POINT_SUPPORTED) ||\ + defined(PNG_FLOATING_ARITHMETIC_SUPPORTED) + /* png.c requires the following ANSI-C constants if the conversion of + * floating point to ASCII is implemented therein: + * + * DBL_DIG Maximum number of decimal digits (can be set to any constant) + * DBL_MIN Smallest normalized fp number (can be set to an arbitrary value) + * DBL_MAX Maximum floating point number (can be set to an arbitrary value) + */ +# include + +# if (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \ + defined(THINK_C) || defined(__SC__) || defined(TARGET_OS_MAC) + /* We need to check that hasn't already been included earlier + * as it seems it doesn't agree with , yet we should really use + * if possible. + */ +# if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__) +# include +# endif +# else +# include +# endif +# if defined(_AMIGA) && defined(__SASC) && defined(_M68881) + /* Amiga SAS/C: We must include builtin FPU functions when compiling using + * MATH=68881 + */ +# include +# endif +#endif + +/* This provides the non-ANSI (far) memory allocation routines. */ +#if defined(__TURBOC__) && defined(__MSDOS__) +# include +# include +#endif + + +/* Moved here around 1.5.0beta36 from pngconf.h */ +/* Users may want to use these so they are not private. Any library + * functions that are passed far data must be model-independent. + */ + +/* Memory model/platform independent fns */ +#ifndef PNG_ABORT +# ifdef _WINDOWS_ +# define PNG_ABORT() ExitProcess(0) +# else +# define PNG_ABORT() abort() +# endif +#endif + +#ifdef USE_FAR_KEYWORD +/* Use this to make far-to-near assignments */ +# define CHECK 1 +# define NOCHECK 0 +# define CVT_PTR(ptr) (png_far_to_near(png_ptr,ptr,CHECK)) +# define CVT_PTR_NOCHECK(ptr) (png_far_to_near(png_ptr,ptr,NOCHECK)) +# define png_strcpy _fstrcpy +# define png_strncpy _fstrncpy /* Added to v 1.2.6 */ +# define png_strlen _fstrlen +# define png_memcmp _fmemcmp /* SJT: added */ +# define png_memcpy _fmemcpy +# define png_memset _fmemset +# define png_sprintf sprintf +#else +# ifdef _WINDOWS_ /* Favor Windows over C runtime fns */ +# define CVT_PTR(ptr) (ptr) +# define CVT_PTR_NOCHECK(ptr) (ptr) +# define png_strcpy lstrcpyA +# define png_strncpy lstrcpynA +# define png_strlen lstrlenA +# define png_memcmp memcmp +# define png_memcpy CopyMemory +# define png_memset memset +# define png_sprintf wsprintfA +# else +# define CVT_PTR(ptr) (ptr) +# define CVT_PTR_NOCHECK(ptr) (ptr) +# define png_strcpy strcpy +# define png_strncpy strncpy /* Added to v 1.2.6 */ +# define png_strlen strlen +# define png_memcmp memcmp /* SJT: added */ +# define png_memcpy memcpy +# define png_memset memset +# define png_sprintf sprintf +# endif +#endif +/* End of memory model/platform independent support */ + +#ifndef PNG_NO_SNPRINTF +# ifdef _MSC_VER +# define png_snprintf _snprintf /* Added to v 1.2.19 */ +# define png_snprintf2 _snprintf +# define png_snprintf6 _snprintf +# else +# define png_snprintf snprintf /* Added to v 1.2.19 */ +# define png_snprintf2 snprintf +# define png_snprintf6 snprintf +# endif +#else + /* You don't have or don't want to use snprintf(). Caution: Using + * sprintf instead of snprintf exposes your application to accidental + * or malevolent buffer overflows. If you don't have snprintf() + * as a general rule you should provide one (you can get one from + * Portable OpenSSH). + */ +# define png_snprintf(s1,n,fmt,x1) png_sprintf(s1,fmt,x1) +# define png_snprintf2(s1,n,fmt,x1,x2) png_sprintf(s1,fmt,x1,x2) +# define png_snprintf6(s1,n,fmt,x1,x2,x3,x4,x5,x6) \ + png_sprintf(s1,fmt,x1,x2,x3,x4,x5,x6) +#endif +/* End of 1.5.0beta36 move from pngconf.h */ + +/* CONSTANTS and UTILITY MACROS + * These are used internally by libpng and not exposed in the API + */ + +/* Various modes of operation. Note that after an init, mode is set to + * zero automatically when the structure is created. + */ +#define PNG_HAVE_IHDR 0x01 +#define PNG_HAVE_PLTE 0x02 +#define PNG_HAVE_IDAT 0x04 +#define PNG_AFTER_IDAT 0x08 /* Have complete zlib datastream */ +#define PNG_HAVE_IEND 0x10 +#define PNG_HAVE_gAMA 0x20 +#define PNG_HAVE_cHRM 0x40 +#define PNG_HAVE_sRGB 0x80 +#define PNG_HAVE_CHUNK_HEADER 0x100 +#define PNG_WROTE_tIME 0x200 +#define PNG_WROTE_INFO_BEFORE_PLTE 0x400 +#define PNG_BACKGROUND_IS_GRAY 0x800 +#define PNG_HAVE_PNG_SIGNATURE 0x1000 +#define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */ + +/* Flags for the transformations the PNG library does on the image data */ +#define PNG_BGR 0x0001 +#define PNG_INTERLACE 0x0002 +#define PNG_PACK 0x0004 +#define PNG_SHIFT 0x0008 +#define PNG_SWAP_BYTES 0x0010 +#define PNG_INVERT_MONO 0x0020 +#define PNG_QUANTIZE 0x0040 +#define PNG_BACKGROUND 0x0080 +#define PNG_BACKGROUND_EXPAND 0x0100 + /* 0x0200 unused */ +#define PNG_16_TO_8 0x0400 +#define PNG_RGBA 0x0800 +#define PNG_EXPAND 0x1000 +#define PNG_GAMMA 0x2000 +#define PNG_GRAY_TO_RGB 0x4000 +#define PNG_FILLER 0x8000L +#define PNG_PACKSWAP 0x10000L +#define PNG_SWAP_ALPHA 0x20000L +#define PNG_STRIP_ALPHA 0x40000L +#define PNG_INVERT_ALPHA 0x80000L +#define PNG_USER_TRANSFORM 0x100000L +#define PNG_RGB_TO_GRAY_ERR 0x200000L +#define PNG_RGB_TO_GRAY_WARN 0x400000L +#define PNG_RGB_TO_GRAY 0x600000L /* two bits, RGB_TO_GRAY_ERR|WARN */ + /* 0x800000L Unused */ +#define PNG_ADD_ALPHA 0x1000000L /* Added to libpng-1.2.7 */ +#define PNG_EXPAND_tRNS 0x2000000L /* Added to libpng-1.2.9 */ + /* 0x4000000L unused */ + /* 0x8000000L unused */ + /* 0x10000000L unused */ + /* 0x20000000L unused */ + /* 0x40000000L unused */ + +/* Flags for png_create_struct */ +#define PNG_STRUCT_PNG 0x0001 +#define PNG_STRUCT_INFO 0x0002 + +/* Scaling factor for filter heuristic weighting calculations */ +#define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT)) +#define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT)) + +/* Flags for the png_ptr->flags rather than declaring a byte for each one */ +#define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001 +#define PNG_FLAG_ZLIB_CUSTOM_LEVEL 0x0002 +#define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL 0x0004 +#define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS 0x0008 +#define PNG_FLAG_ZLIB_CUSTOM_METHOD 0x0010 +#define PNG_FLAG_ZLIB_FINISHED 0x0020 +#define PNG_FLAG_ROW_INIT 0x0040 +#define PNG_FLAG_FILLER_AFTER 0x0080 +#define PNG_FLAG_CRC_ANCILLARY_USE 0x0100 +#define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200 +#define PNG_FLAG_CRC_CRITICAL_USE 0x0400 +#define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800 + /* 0x1000 unused */ + /* 0x2000 unused */ + /* 0x4000 unused */ +#define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000L +#define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000L +#define PNG_FLAG_LIBRARY_MISMATCH 0x20000L +#define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000L +#define PNG_FLAG_STRIP_ERROR_TEXT 0x80000L +#define PNG_FLAG_MALLOC_NULL_MEM_OK 0x100000L +#define PNG_FLAG_ADD_ALPHA 0x200000L /* Added to libpng-1.2.8 */ +#define PNG_FLAG_STRIP_ALPHA 0x400000L /* Added to libpng-1.2.8 */ +#define PNG_FLAG_BENIGN_ERRORS_WARN 0x800000L /* Added to libpng-1.4.0 */ + /* 0x1000000L unused */ + /* 0x2000000L unused */ + /* 0x4000000L unused */ + /* 0x8000000L unused */ + /* 0x10000000L unused */ + /* 0x20000000L unused */ + /* 0x40000000L unused */ + +#define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \ + PNG_FLAG_CRC_ANCILLARY_NOWARN) + +#define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \ + PNG_FLAG_CRC_CRITICAL_IGNORE) + +#define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \ + PNG_FLAG_CRC_CRITICAL_MASK) + +/* zlib.h declares a magic type 'uInt' that limits the amount of data that zlib + * can handle at once. This type need be no larger than 16 bits (so maximum of + * 65535), this define allows us to discover how big it is, but limited by the + * maximuum for png_size_t. The value can be overriden in a library build + * (pngusr.h, or set it in CPPFLAGS) and it works to set it to a considerably + * lower value (e.g. 255 works). A lower value may help memory usage (slightly) + * and may even improve performance on some systems (and degrade it on others.) + */ +#ifndef ZLIB_IO_MAX +# define ZLIB_IO_MAX ((uInt)-1) +#endif + +/* Save typing and make code easier to understand */ + +#define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \ + abs((int)((c1).green) - (int)((c2).green)) + \ + abs((int)((c1).blue) - (int)((c2).blue))) + +/* Added to libpng-1.2.6 JB */ +#define PNG_ROWBYTES(pixel_bits, width) \ + ((pixel_bits) >= 8 ? \ + ((png_size_t)(width) * (((png_size_t)(pixel_bits)) >> 3)) : \ + (( ((png_size_t)(width) * ((png_size_t)(pixel_bits))) + 7) >> 3) ) + +/* PNG_OUT_OF_RANGE returns true if value is outside the range + * ideal-delta..ideal+delta. Each argument is evaluated twice. + * "ideal" and "delta" should be constants, normally simple + * integers, "value" a variable. Added to libpng-1.2.6 JB + */ +#define PNG_OUT_OF_RANGE(value, ideal, delta) \ + ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) ) + +/* Conversions between fixed and floating point, only defined if + * required (to make sure the code doesn't accidentally use float + * when it is supposedly disabled.) + */ +#ifdef PNG_FLOATING_POINT_SUPPORTED +/* The floating point conversion can't overflow, though it can and + * does lose accuracy relative to the original fixed point value. + * In practice this doesn't matter because png_fixed_point only + * stores numbers with very low precision. The png_ptr and s + * arguments are unused by default but are there in case error + * checking becomes a requirement. + */ +#define png_float(png_ptr, fixed, s) (.00001 * (fixed)) + +/* The fixed point conversion performs range checking and evaluates + * its argument multiple times, so must be used with care. The + * range checking uses the PNG specification values for a signed + * 32 bit fixed point value except that the values are deliberately + * rounded-to-zero to an integral value - 21474 (21474.83 is roughly + * (2^31-1) * 100000). 's' is a string that describes the value being + * converted. + * + * NOTE: this macro will raise a png_error if the range check fails, + * therefore it is normally only appropriate to use this on values + * that come from API calls or other sources where an out of range + * error indicates a programming error, not a data error! + * + * NOTE: by default this is off - the macro is not used - because the + * function call saves a lot of code. + */ +#ifdef PNG_FIXED_POINT_MACRO_SUPPORTED +#define png_fixed(png_ptr, fp, s) ((fp) <= 21474 && (fp) >= -21474 ?\ + ((png_fixed_point)(100000 * (fp))) : (png_fixed_error(png_ptr, s),0)) +#else +PNG_EXTERN png_fixed_point png_fixed PNGARG((png_structp png_ptr, double fp, + png_const_charp text)); +#endif +#endif + +/* Constant strings for known chunk types. If you need to add a chunk, + * define the name here, and add an invocation of the macro wherever it's + * needed. + */ +#define PNG_IHDR PNG_CONST png_byte png_IHDR[5] = { 73, 72, 68, 82, '\0'} +#define PNG_IDAT PNG_CONST png_byte png_IDAT[5] = { 73, 68, 65, 84, '\0'} +#define PNG_IEND PNG_CONST png_byte png_IEND[5] = { 73, 69, 78, 68, '\0'} +#define PNG_PLTE PNG_CONST png_byte png_PLTE[5] = { 80, 76, 84, 69, '\0'} +#define PNG_bKGD PNG_CONST png_byte png_bKGD[5] = { 98, 75, 71, 68, '\0'} +#define PNG_cHRM PNG_CONST png_byte png_cHRM[5] = { 99, 72, 82, 77, '\0'} +#define PNG_gAMA PNG_CONST png_byte png_gAMA[5] = {103, 65, 77, 65, '\0'} +#define PNG_hIST PNG_CONST png_byte png_hIST[5] = {104, 73, 83, 84, '\0'} +#define PNG_iCCP PNG_CONST png_byte png_iCCP[5] = {105, 67, 67, 80, '\0'} +#define PNG_iTXt PNG_CONST png_byte png_iTXt[5] = {105, 84, 88, 116, '\0'} +#define PNG_oFFs PNG_CONST png_byte png_oFFs[5] = {111, 70, 70, 115, '\0'} +#define PNG_pCAL PNG_CONST png_byte png_pCAL[5] = {112, 67, 65, 76, '\0'} +#define PNG_sCAL PNG_CONST png_byte png_sCAL[5] = {115, 67, 65, 76, '\0'} +#define PNG_pHYs PNG_CONST png_byte png_pHYs[5] = {112, 72, 89, 115, '\0'} +#define PNG_sBIT PNG_CONST png_byte png_sBIT[5] = {115, 66, 73, 84, '\0'} +#define PNG_sPLT PNG_CONST png_byte png_sPLT[5] = {115, 80, 76, 84, '\0'} +#define PNG_sRGB PNG_CONST png_byte png_sRGB[5] = {115, 82, 71, 66, '\0'} +#define PNG_sTER PNG_CONST png_byte png_sTER[5] = {115, 84, 69, 82, '\0'} +#define PNG_tEXt PNG_CONST png_byte png_tEXt[5] = {116, 69, 88, 116, '\0'} +#define PNG_tIME PNG_CONST png_byte png_tIME[5] = {116, 73, 77, 69, '\0'} +#define PNG_tRNS PNG_CONST png_byte png_tRNS[5] = {116, 82, 78, 83, '\0'} +#define PNG_zTXt PNG_CONST png_byte png_zTXt[5] = {122, 84, 88, 116, '\0'} + + +/* Inhibit C++ name-mangling for libpng functions but not for system calls. */ +#ifdef __cplusplus +extern "C" { +#endif /* __cplusplus */ + +/* These functions are used internally in the code. They generally + * shouldn't be used unless you are writing code to add or replace some + * functionality in libpng. More information about most functions can + * be found in the files where the functions are located. + */ + +/* Allocate memory for an internal libpng struct */ +PNG_EXTERN PNG_FUNCTION(png_voidp,png_create_struct,PNGARG((int type)), + PNG_ALLOCATED); + +/* Free memory from internal libpng struct */ +PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr)); + +PNG_EXTERN PNG_FUNCTION(png_voidp,png_create_struct_2, + PNGARG((int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr)), + PNG_ALLOCATED); +PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr, + png_free_ptr free_fn, png_voidp mem_ptr)); + +/* Free any memory that info_ptr points to and reset struct. */ +PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr, + png_infop info_ptr)); + +/* Function to allocate memory for zlib. PNGAPI is disallowed. */ +PNG_EXTERN PNG_FUNCTION(voidpf,png_zalloc,PNGARG((voidpf png_ptr, uInt items, + uInt size)),PNG_ALLOCATED); + +/* Function to free memory for zlib. PNGAPI is disallowed. */ +PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr)); + +/* Next four functions are used internally as callbacks. PNGCBAPI is required + * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3, changed to + * PNGCBAPI at 1.5.0 + */ + +PNG_EXTERN void PNGCBAPI png_default_read_data PNGARG((png_structp png_ptr, + png_bytep data, png_size_t length)); + +#ifdef PNG_PROGRESSIVE_READ_SUPPORTED +PNG_EXTERN void PNGCBAPI png_push_fill_buffer PNGARG((png_structp png_ptr, + png_bytep buffer, png_size_t length)); +#endif + +PNG_EXTERN void PNGCBAPI png_default_write_data PNGARG((png_structp png_ptr, + png_bytep data, png_size_t length)); + +#ifdef PNG_WRITE_FLUSH_SUPPORTED +# ifdef PNG_STDIO_SUPPORTED +PNG_EXTERN void PNGCBAPI png_default_flush PNGARG((png_structp png_ptr)); +# endif +#endif + +/* Reset the CRC variable */ +PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr)); + +/* Write the "data" buffer to whatever output you are using */ +PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr, + png_const_bytep data, png_size_t length)); + +/* Read and check the PNG file signature */ +PNG_EXTERN void png_read_sig PNGARG((png_structp png_ptr, png_infop info_ptr)); + +/* Read the chunk header (length + type name) */ +PNG_EXTERN png_uint_32 png_read_chunk_header PNGARG((png_structp png_ptr)); + +/* Read data from whatever input you are using into the "data" buffer */ +PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data, + png_size_t length)); + +/* Read bytes into buf, and update png_ptr->crc */ +PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf, + png_size_t length)); + +/* Decompress data in a chunk that uses compression */ +#if defined(PNG_zTXt_SUPPORTED) || defined(PNG_iTXt_SUPPORTED) || \ + defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) +PNG_EXTERN void png_decompress_chunk PNGARG((png_structp png_ptr, + int comp_type, png_size_t chunklength, png_size_t prefix_length, + png_size_t *data_length)); +#endif + +/* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */ +PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip)); + +/* Read the CRC from the file and compare it to the libpng calculated CRC */ +PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr)); + +/* Calculate the CRC over a section of data. Note that we are only + * passing a maximum of 64K on systems that have this as a memory limit, + * since this is the maximum buffer size we can specify. + */ +PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, + png_const_bytep ptr, png_size_t length)); + +#ifdef PNG_WRITE_FLUSH_SUPPORTED +PNG_EXTERN void png_flush PNGARG((png_structp png_ptr)); +#endif + +/* Write various chunks */ + +/* Write the IHDR chunk, and update the png_struct with the necessary + * information. + */ +PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width, + png_uint_32 height, + int bit_depth, int color_type, int compression_method, int filter_method, + int interlace_method)); + +PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr, + png_const_colorp palette, png_uint_32 num_pal)); + +PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data, + png_size_t length)); + +PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr)); + +#ifdef PNG_WRITE_gAMA_SUPPORTED +# ifdef PNG_FLOATING_POINT_SUPPORTED +PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma)); +# endif +# ifdef PNG_FIXED_POINT_SUPPORTED +PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr, + png_fixed_point file_gamma)); +# endif +#endif + +#ifdef PNG_WRITE_sBIT_SUPPORTED +PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr, + png_const_color_8p sbit, int color_type)); +#endif + +#ifdef PNG_WRITE_cHRM_SUPPORTED +# ifdef PNG_FLOATING_POINT_SUPPORTED +PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr, + double white_x, double white_y, + double red_x, double red_y, double green_x, double green_y, + double blue_x, double blue_y)); +# endif +PNG_EXTERN void png_write_cHRM_fixed PNGARG((png_structp png_ptr, + png_fixed_point int_white_x, png_fixed_point int_white_y, + png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point + int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, + png_fixed_point int_blue_y)); +#endif + +#ifdef PNG_WRITE_sRGB_SUPPORTED +PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr, + int intent)); +#endif + +#ifdef PNG_WRITE_iCCP_SUPPORTED +PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr, + png_const_charp name, int compression_type, + png_const_charp profile, int proflen)); + /* Note to maintainer: profile should be png_bytep */ +#endif + +#ifdef PNG_WRITE_sPLT_SUPPORTED +PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr, + png_const_sPLT_tp palette)); +#endif + +#ifdef PNG_WRITE_tRNS_SUPPORTED +PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr, + png_const_bytep trans, png_const_color_16p values, int number, + int color_type)); +#endif + +#ifdef PNG_WRITE_bKGD_SUPPORTED +PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr, + png_const_color_16p values, int color_type)); +#endif + +#ifdef PNG_WRITE_hIST_SUPPORTED +PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, + png_const_uint_16p hist, int num_hist)); +#endif + +#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \ + defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED) +PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr, + png_const_charp key, png_charpp new_key)); +#endif + +#ifdef PNG_WRITE_tEXt_SUPPORTED +PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_const_charp key, + png_const_charp text, png_size_t text_len)); +#endif + +#ifdef PNG_WRITE_zTXt_SUPPORTED +PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_const_charp key, + png_const_charp text, png_size_t text_len, int compression)); +#endif + +#ifdef PNG_WRITE_iTXt_SUPPORTED +PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr, + int compression, png_const_charp key, png_const_charp lang, + png_const_charp lang_key, png_const_charp text)); +#endif + +#ifdef PNG_TEXT_SUPPORTED /* Added at version 1.0.14 and 1.2.4 */ +PNG_EXTERN int png_set_text_2 PNGARG((png_structp png_ptr, + png_infop info_ptr, png_const_textp text_ptr, int num_text)); +#endif + +#ifdef PNG_WRITE_oFFs_SUPPORTED +PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr, + png_int_32 x_offset, png_int_32 y_offset, int unit_type)); +#endif + +#ifdef PNG_WRITE_pCAL_SUPPORTED +PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose, + png_int_32 X0, png_int_32 X1, int type, int nparams, + png_const_charp units, png_charpp params)); +#endif + +#ifdef PNG_WRITE_pHYs_SUPPORTED +PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr, + png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit, + int unit_type)); +#endif + +#ifdef PNG_WRITE_tIME_SUPPORTED +PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr, + png_const_timep mod_time)); +#endif + +#ifdef PNG_WRITE_sCAL_SUPPORTED +PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr, + int unit, png_const_charp width, png_const_charp height)); +#endif + +/* Called when finished processing a row of data */ +PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr)); + +/* Internal use only. Called before first row of data */ +PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr)); + +/* Combine a row of data, dealing with alpha, etc. if requested */ +PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row, + int mask)); + +#ifdef PNG_READ_INTERLACING_SUPPORTED +/* Expand an interlaced row */ +/* OLD pre-1.0.9 interface: +PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info, + png_bytep row, int pass, png_uint_32 transformations)); + */ +PNG_EXTERN void png_do_read_interlace PNGARG((png_structp png_ptr)); +#endif + +/* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */ + +#ifdef PNG_WRITE_INTERLACING_SUPPORTED +/* Grab pixels out of a row for an interlaced pass */ +PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info, + png_bytep row, int pass)); +#endif + +/* Unfilter a row */ +PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr, + png_row_infop row_info, png_bytep row, png_const_bytep prev_row, + int filter)); + +/* Choose the best filter to use and filter the row data */ +PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr, + png_row_infop row_info)); + +/* Write out the filtered row. */ +PNG_EXTERN void png_write_filtered_row PNGARG((png_structp png_ptr, + png_bytep filtered_row)); +/* Finish a row while reading, dealing with interlacing passes, etc. */ +PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr)); + +/* Initialize the row buffers, etc. */ +PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr)); +/* Optional call to update the users info structure */ +PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr, + png_infop info_ptr)); + +/* These are the functions that do the transformations */ +#ifdef PNG_READ_FILLER_SUPPORTED +PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info, + png_bytep row, png_uint_32 filler, png_uint_32 flags)); +#endif + +#ifdef PNG_READ_SWAP_ALPHA_SUPPORTED +PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info, + png_bytep row)); +#endif + +#ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED +PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info, + png_bytep row)); +#endif + +#ifdef PNG_READ_INVERT_ALPHA_SUPPORTED +PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info, + png_bytep row)); +#endif + +#ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED +PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info, + png_bytep row)); +#endif + +#if defined(PNG_WRITE_FILLER_SUPPORTED) || \ + defined(PNG_READ_STRIP_ALPHA_SUPPORTED) +PNG_EXTERN void png_do_strip_filler PNGARG((png_row_infop row_info, + png_bytep row, png_uint_32 flags)); +#endif + +#ifdef PNG_16BIT_SUPPORTED +#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) +PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info, + png_bytep row)); +#endif +#endif + +#if defined(PNG_READ_PACKSWAP_SUPPORTED) || \ + defined(PNG_WRITE_PACKSWAP_SUPPORTED) +PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, + png_bytep row)); +#endif + +#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED +PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr, + png_row_infop row_info, png_bytep row)); +#endif + +#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED +PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info, + png_bytep row)); +#endif + +#ifdef PNG_READ_PACK_SUPPORTED +PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info, + png_bytep row)); +#endif + +#ifdef PNG_READ_SHIFT_SUPPORTED +PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info, + png_bytep row, png_const_color_8p sig_bits)); +#endif + +#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) +PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info, + png_bytep row)); +#endif + +#ifdef PNG_READ_16_TO_8_SUPPORTED +PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info, + png_bytep row)); +#endif + +#ifdef PNG_READ_QUANTIZE_SUPPORTED +PNG_EXTERN void png_do_quantize PNGARG((png_row_infop row_info, + png_bytep row, png_const_bytep palette_lookup, + png_const_bytep quantize_lookup)); + +# ifdef PNG_CORRECT_PALETTE_SUPPORTED +PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr, + png_colorp palette, int num_palette)); +# endif +#endif + +#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) +PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info, + png_bytep row)); +#endif + +#ifdef PNG_WRITE_PACK_SUPPORTED +PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info, + png_bytep row, png_uint_32 bit_depth)); +#endif + +#ifdef PNG_WRITE_SHIFT_SUPPORTED +PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info, + png_bytep row, png_const_color_8p bit_depth)); +#endif + +#ifdef PNG_READ_BACKGROUND_SUPPORTED +# ifdef PNG_READ_GAMMA_SUPPORTED +PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, + png_bytep row, png_const_color_16p trans_color, + png_const_color_16p background, png_const_color_16p background_1, + png_const_bytep gamma_table, png_const_bytep gamma_from_1, + png_const_bytep gamma_to_1, png_const_uint_16pp gamma_16, + png_const_uint_16pp gamma_16_from_1, png_const_uint_16pp gamma_16_to_1, + int gamma_shift)); +# else +PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, + png_bytep row, png_const_color_16p trans_color, + png_const_color_16p background)); +# endif +#endif + +#ifdef PNG_READ_GAMMA_SUPPORTED +PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info, + png_bytep row, png_const_bytep gamma_table, + png_const_uint_16pp gamma_16_table, int gamma_shift)); +#endif + +#ifdef PNG_READ_EXPAND_SUPPORTED +PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info, + png_bytep row, png_const_colorp palette, png_const_bytep trans, + int num_trans)); +PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info, + png_bytep row, png_const_color_16p trans_color)); +#endif + +/* The following decodes the appropriate chunks, and does error correction, + * then calls the appropriate callback for the chunk if it is valid. + */ + +/* Decode the IHDR chunk */ +PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr, + png_uint_32 length)); +PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr, + png_uint_32 length)); +PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr, + png_uint_32 length)); + +#ifdef PNG_READ_bKGD_SUPPORTED +PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr, + png_uint_32 length)); +#endif + +#ifdef PNG_READ_cHRM_SUPPORTED +PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr, + png_uint_32 length)); +#endif + +#ifdef PNG_READ_gAMA_SUPPORTED +PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr, + png_uint_32 length)); +#endif + +#ifdef PNG_READ_hIST_SUPPORTED +PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr, + png_uint_32 length)); +#endif + +#ifdef PNG_READ_iCCP_SUPPORTED +PNG_EXTERN void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr, + png_uint_32 length)); +#endif /* PNG_READ_iCCP_SUPPORTED */ + +#ifdef PNG_READ_iTXt_SUPPORTED +PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr, + png_uint_32 length)); +#endif + +#ifdef PNG_READ_oFFs_SUPPORTED +PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr, + png_uint_32 length)); +#endif + +#ifdef PNG_READ_pCAL_SUPPORTED +PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr, + png_uint_32 length)); +#endif + +#ifdef PNG_READ_pHYs_SUPPORTED +PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr, + png_uint_32 length)); +#endif + +#ifdef PNG_READ_sBIT_SUPPORTED +PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr, + png_uint_32 length)); +#endif + +#ifdef PNG_READ_sCAL_SUPPORTED +PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr, + png_uint_32 length)); +#endif + +#ifdef PNG_READ_sPLT_SUPPORTED +PNG_EXTERN void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr, + png_uint_32 length)); +#endif /* PNG_READ_sPLT_SUPPORTED */ + +#ifdef PNG_READ_sRGB_SUPPORTED +PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr, + png_uint_32 length)); +#endif + +#ifdef PNG_READ_tEXt_SUPPORTED +PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr, + png_uint_32 length)); +#endif + +#ifdef PNG_READ_tIME_SUPPORTED +PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr, + png_uint_32 length)); +#endif + +#ifdef PNG_READ_tRNS_SUPPORTED +PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr, + png_uint_32 length)); +#endif + +#ifdef PNG_READ_zTXt_SUPPORTED +PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr, + png_uint_32 length)); +#endif + +PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr, + png_infop info_ptr, png_uint_32 length)); + +PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr, + png_const_bytep chunk_name)); + +/* Handle the transformations for reading and writing */ +PNG_EXTERN void png_do_read_transformations PNGARG((png_structp png_ptr)); +PNG_EXTERN void png_do_write_transformations PNGARG((png_structp png_ptr)); + +PNG_EXTERN void png_init_read_transformations PNGARG((png_structp png_ptr)); + +#ifdef PNG_PROGRESSIVE_READ_SUPPORTED +PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr, + png_infop info_ptr)); +PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr, + png_infop info_ptr)); +PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr)); +PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr, + png_uint_32 length)); +PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr)); +PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr)); +PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr, + png_bytep buffer, png_size_t buffer_length)); +PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr)); +PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr, + png_bytep buffer, png_size_t buffer_length)); +PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr)); +PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr, + png_infop info_ptr, png_uint_32 length)); +PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr, + png_infop info_ptr)); +PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr, + png_infop info_ptr)); +PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr, png_bytep row)); +PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr, + png_infop info_ptr)); +PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr, + png_infop info_ptr)); +PNG_EXTERN void png_read_push_finish_row PNGARG((png_structp png_ptr)); +# ifdef PNG_READ_tEXt_SUPPORTED +PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr, + png_infop info_ptr, png_uint_32 length)); +PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr, + png_infop info_ptr)); +# endif +# ifdef PNG_READ_zTXt_SUPPORTED +PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr, + png_infop info_ptr, png_uint_32 length)); +PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr, + png_infop info_ptr)); +# endif +# ifdef PNG_READ_iTXt_SUPPORTED +PNG_EXTERN void png_push_handle_iTXt PNGARG((png_structp png_ptr, + png_infop info_ptr, png_uint_32 length)); +PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr, + png_infop info_ptr)); +# endif + +#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ + +#ifdef PNG_MNG_FEATURES_SUPPORTED +PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info, + png_bytep row)); +PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info, + png_bytep row)); +#endif + +/* Added at libpng version 1.4.0 */ +#ifdef PNG_CHECK_cHRM_SUPPORTED +PNG_EXTERN int png_check_cHRM_fixed PNGARG((png_structp png_ptr, + png_fixed_point int_white_x, png_fixed_point int_white_y, + png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point + int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, + png_fixed_point int_blue_y)); +#endif + +#ifdef PNG_CHECK_cHRM_SUPPORTED +/* Added at libpng version 1.2.34 and 1.4.0 */ +/* Currently only used by png_check_cHRM_fixed */ +PNG_EXTERN void png_64bit_product PNGARG((long v1, long v2, + unsigned long *hi_product, unsigned long *lo_product)); +#endif + +/* Added at libpng version 1.4.0 */ +PNG_EXTERN void png_check_IHDR PNGARG((png_structp png_ptr, + png_uint_32 width, png_uint_32 height, int bit_depth, + int color_type, int interlace_type, int compression_type, + int filter_type)); + +/* Free all memory used by the read (old method - NOT DLL EXPORTED) */ +PNG_EXTERN void png_read_destroy PNGARG((png_structp png_ptr, + png_infop info_ptr, png_infop end_info_ptr)); + +/* Free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */ +PNG_EXTERN void png_write_destroy PNGARG((png_structp png_ptr)); + +#ifdef USE_FAR_KEYWORD /* memory model conversion function */ +PNG_EXTERN void *png_far_to_near PNGARG((png_structp png_ptr, png_voidp ptr, + int check)); +#endif /* USE_FAR_KEYWORD */ + +#if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED) +PNG_EXTERN PNG_FUNCTION(void, png_fixed_error, (png_structp png_ptr, + png_const_charp name),PNG_NORETURN); +#endif + +/* ASCII to FP interfaces, currently only implemented if sCAL + * support is required. + */ +#if defined(PNG_READ_sCAL_SUPPORTED) +/* MAX_DIGITS is actually the maximum number of characters in an sCAL + * width or height, derived from the precision (number of significant + * digits - a build time settable option) and assumpitions about the + * maximum ridiculous exponent. + */ +#define PNG_sCAL_MAX_DIGITS (PNG_sCAL_PRECISION+1/*.*/+1/*E*/+10/*exponent*/) + +#ifdef PNG_FLOATING_POINT_SUPPORTED +PNG_EXTERN void png_ascii_from_fp PNGARG((png_structp png_ptr, png_charp ascii, + png_size_t size, double fp, unsigned int precision)); +#endif /* FLOATING_POINT */ + +#ifdef PNG_FIXED_POINT_SUPPORTED +PNG_EXTERN void png_ascii_from_fixed PNGARG((png_structp png_ptr, + png_charp ascii, png_size_t size, png_fixed_point fp)); +#endif /* FIXED_POINT */ +#endif /* READ_sCAL */ + +#if defined(PNG_sCAL_SUPPORTED) || defined(PNG_pCAL_SUPPORTED) +/* An internal API to validate the format of a floating point number. + * The result is the index of the next character. If the number is + * not valid it will be the index of a character in the supposed number. + * + * The format of a number is defined in the PNG extensions specification + * and this API is strictly conformant to that spec, not anyone elses! + * + * The format as a regular expression is: + * + * [+-]?[0-9]+.?([Ee][+-]?[0-9]+)? + * + * or: + * + * [+-]?.[0-9]+(.[0-9]+)?([Ee][+-]?[0-9]+)? + * + * The complexity is that either integer or fraction must be present and the + * fraction is permitted to have no digits only if the integer is present. + * + * NOTE: The dangling E problem. + * There is a PNG valid floating point number in the following: + * + * PNG floating point numb1.ers are not greedy. + * + * Working this out requires *TWO* character lookahead (because of the + * sign), the parser does not do this - it will fail at the 'r' - this + * doesn't matter for PNG sCAL chunk values, but it requires more care + * if the value were ever to be embedded in something more complex. Use + * ANSI-C strtod if you need the lookahead. + */ +/* State table for the parser. */ +#define PNG_FP_INTEGER 0 /* before or in integer */ +#define PNG_FP_FRACTION 1 /* before or in fraction */ +#define PNG_FP_EXPONENT 2 /* before or in exponent */ +#define PNG_FP_STATE 3 /* mask for the above */ +#define PNG_FP_SAW_SIGN 4 /* Saw +/- in current state */ +#define PNG_FP_SAW_DIGIT 8 /* Saw a digit in current state */ +#define PNG_FP_SAW_DOT 16 /* Saw a dot in current state */ +#define PNG_FP_SAW_E 32 /* Saw an E (or e) in current state */ +#define PNG_FP_SAW_ANY 60 /* Saw any of the above 4 */ +#define PNG_FP_WAS_VALID 64 /* Preceding substring is a valid fp number */ +#define PNG_FP_INVALID 128 /* Available for callers as a distinct value */ + +/* Result codes for the parser (boolean - true meants ok, false means + * not ok yet.) + */ +#define PNG_FP_MAYBE 0 /* The number may be valid in the future */ +#define PNG_FP_OK 1 /* The number is valid */ + +/* The actual parser. This can be called repeatedly, it updates + * the index into the string and the state variable (which must + * be initialzed to 0). It returns a result code, as above. There + * is no point calling the parser any more if it fails to advance to + * the end of the string - it is stuck on an invalid character (or + * terminated by '\0'). + * + * Note that the pointer will consume an E or even an E+ then leave + * a 'maybe' state even though a preceding integer.fraction is valid. + * The PNG_FP_WAS_VALID flag indicates that a preceding substring was + * a valid number. It's possible to recover from this by calling + * the parser again (from the start, with state 0) but with a string + * that omits the last character (i.e. set the size to the index of + * the problem character.) This has not been tested within libpng. + */ +PNG_EXTERN int png_check_fp_number PNGARG((png_const_charp string, + png_size_t size, int *statep, png_size_tp whereami)); + +/* This is the same but it checks a complete string and returns true + * only if it just contains a floating point number. + */ +PNG_EXTERN int png_check_fp_string PNGARG((png_const_charp string, + png_size_t size)); +#endif /* pCAL || sCAL */ + +#if defined(PNG_READ_GAMMA_SUPPORTED) ||\ + defined(PNG_INCH_CONVERSIONS_SUPPORTED) || defined(PNG_READ_pHYs_SUPPORTED) +/* Added at libpng version 1.5.0 */ +/* This is a utility to provide a*times/div (rounded) and indicate + * if there is an overflow. The result is a boolean - false (0) + * for overflow, true (1) if no overflow, in which case *res + * holds the result. + */ +PNG_EXTERN int png_muldiv PNGARG((png_fixed_point_p res, png_fixed_point a, + png_int_32 times, png_int_32 div)); +#endif + +#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_INCH_CONVERSIONS_SUPPORTED) +/* Same deal, but issue a warning on overflow and return 0. */ +PNG_EXTERN png_fixed_point png_muldiv_warn PNGARG((png_structp png_ptr, + png_fixed_point a, png_int_32 times, png_int_32 div)); +#endif + +#ifdef PNG_READ_GAMMA_SUPPORTED +/* Calculate a reciprocal - used for gamma values. This returns + * 0 if the argument is 0 in order to maintain an undefined value, + * there are no warnings. + */ +PNG_EXTERN png_fixed_point png_reciprocal PNGARG((png_fixed_point a)); + +/* The same but gives a reciprocal of the product of two fixed point + * values. Accuracy is suitable for gamma calculations but this is + * not exact - use png_muldiv for that. + */ +PNG_EXTERN png_fixed_point png_reciprocal2 PNGARG((png_fixed_point a, + png_fixed_point b)); +#endif + +#ifdef PNG_READ_GAMMA_SUPPORTED +/* Internal fixed point gamma correction. These APIs are called as + * required to convert single values - they don't need to be fast, + * they are not used when processing image pixel values. + * + * While the input is an 'unsigned' value it must actually be the + * correct bit value - 0..255 or 0..65535 as required. + */ +PNG_EXTERN png_uint_16 png_gamma_correct PNGARG((png_structp png_ptr, + unsigned int value, png_fixed_point gamma)); +PNG_EXTERN int png_gamma_significant PNGARG((png_fixed_point gamma)); +PNG_EXTERN png_uint_16 png_gamma_16bit_correct PNGARG((unsigned int value, + png_fixed_point gamma)); +PNG_EXTERN png_byte png_gamma_8bit_correct PNGARG((unsigned int value, + png_fixed_point gamma)); +PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr, + int bit_depth)); +#endif + +/* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */ + + +#include "pngdebug.h" + +#ifdef __cplusplus +} +#endif + +#endif /* PNGPRIV_H */ diff --git a/programs/develop/libraries/libpng/pngread.c b/programs/develop/libraries/libpng/pngread.c new file mode 100644 index 0000000000..2c8f2cd687 --- /dev/null +++ b/programs/develop/libraries/libpng/pngread.c @@ -0,0 +1,1466 @@ + +/* pngread.c - read a PNG file + * + * Last changed in libpng 1.5.1 [$RDATE%] + * Copyright (c) 1998-2011 Glenn Randers-Pehrson + * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) + * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) + * + * This code is released under the libpng license. + * For conditions of distribution and use, see the disclaimer + * and license in png.h + * + * This file contains routines that an application calls directly to + * read a PNG file or stream. + */ + +#include "pngpriv.h" + +#ifdef PNG_READ_SUPPORTED + +/* Create a PNG structure for reading, and allocate any memory needed. */ +PNG_FUNCTION(png_structp,PNGAPI +png_create_read_struct,(png_const_charp user_png_ver, png_voidp error_ptr, + png_error_ptr error_fn, png_error_ptr warn_fn),PNG_ALLOCATED) +{ + +#ifdef PNG_USER_MEM_SUPPORTED + return (png_create_read_struct_2(user_png_ver, error_ptr, error_fn, + warn_fn, NULL, NULL, NULL)); +} + +/* Alternate create PNG structure for reading, and allocate any memory + * needed. + */ +PNG_FUNCTION(png_structp,PNGAPI +png_create_read_struct_2,(png_const_charp user_png_ver, png_voidp error_ptr, + png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, + png_malloc_ptr malloc_fn, png_free_ptr free_fn),PNG_ALLOCATED) +{ +#endif /* PNG_USER_MEM_SUPPORTED */ + +#ifdef PNG_SETJMP_SUPPORTED + volatile +#endif + png_structp png_ptr; + volatile int png_cleanup_needed = 0; + +#ifdef PNG_SETJMP_SUPPORTED +#ifdef USE_FAR_KEYWORD + jmp_buf png_jmpbuf; +#endif +#endif + + int i; + + png_debug(1, "in png_create_read_struct"); + +#ifdef PNG_USER_MEM_SUPPORTED + png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG, + malloc_fn, mem_ptr); +#else + png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG); +#endif + if (png_ptr == NULL) + return (NULL); + + /* Added at libpng-1.2.6 */ +#ifdef PNG_USER_LIMITS_SUPPORTED + png_ptr->user_width_max = PNG_USER_WIDTH_MAX; + png_ptr->user_height_max = PNG_USER_HEIGHT_MAX; + +# ifdef PNG_USER_CHUNK_CACHE_MAX + /* Added at libpng-1.2.43 and 1.4.0 */ + png_ptr->user_chunk_cache_max = PNG_USER_CHUNK_CACHE_MAX; +# endif + +# ifdef PNG_SET_USER_CHUNK_MALLOC_MAX + /* Added at libpng-1.2.43 and 1.4.1 */ + png_ptr->user_chunk_malloc_max = PNG_USER_CHUNK_MALLOC_MAX; +# endif +#endif + +#ifdef PNG_SETJMP_SUPPORTED +/* Applications that neglect to set up their own setjmp() and then + encounter a png_error() will longjmp here. Since the jmpbuf is + then meaningless we abort instead of returning. */ +#ifdef USE_FAR_KEYWORD + if (setjmp(png_jmpbuf)) +#else + if (setjmp(png_jmpbuf(png_ptr))) /* Sets longjmp to match setjmp */ +#endif + PNG_ABORT(); +#ifdef USE_FAR_KEYWORD + png_memcpy(png_jmpbuf(png_ptr), png_jmpbuf, png_sizeof(jmp_buf)); +#endif +#endif /* PNG_SETJMP_SUPPORTED */ + +#ifdef PNG_USER_MEM_SUPPORTED + png_set_mem_fn(png_ptr, mem_ptr, malloc_fn, free_fn); +#endif + + png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn); + + if (user_png_ver) + { + i = 0; + + do + { + if (user_png_ver[i] != png_libpng_ver[i]) + png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH; + } while (png_libpng_ver[i++]); + } + + else + png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH; + + + if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH) + { + /* Libpng 0.90 and later are binary incompatible with libpng 0.89, so + * we must recompile any applications that use any older library version. + * For versions after libpng 1.0, we will be compatible, so we need + * only check the first digit. + */ + if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] || + (user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) || + (user_png_ver[0] == '0' && user_png_ver[2] < '9')) + { +#ifdef PNG_CONSOLE_IO_SUPPORTED + char msg[80]; + if (user_png_ver) + { + png_snprintf2(msg, 80, + "Application built with libpng-%.20s" + " but running with %.20s", + user_png_ver, + png_libpng_ver); + png_warning(png_ptr, msg); + } +#else + png_warning(png_ptr, + "Incompatible libpng version in application and library"); +#endif +#ifdef PNG_ERROR_NUMBERS_SUPPORTED + png_ptr->flags = 0; +#endif + + png_cleanup_needed = 1; + } + } + + if (!png_cleanup_needed) + { + /* Initialize zbuf - compression buffer */ + png_ptr->zbuf_size = PNG_ZBUF_SIZE; + png_ptr->zbuf = (png_bytep)png_malloc_warn(png_ptr, png_ptr->zbuf_size); + + if (png_ptr->zbuf == NULL) + png_cleanup_needed = 1; + } + + png_ptr->zstream.zalloc = png_zalloc; + png_ptr->zstream.zfree = png_zfree; + png_ptr->zstream.opaque = (voidpf)png_ptr; + + if (!png_cleanup_needed) + { + switch (inflateInit(&png_ptr->zstream)) + { + case Z_OK: + break; /* Do nothing */ + + case Z_MEM_ERROR: + png_warning(png_ptr, "zlib memory error"); + png_cleanup_needed = 1; + break; + + case Z_STREAM_ERROR: + png_warning(png_ptr, "zlib stream error"); + png_cleanup_needed = 1; + break; + + case Z_VERSION_ERROR: + png_warning(png_ptr, "zlib version error"); + png_cleanup_needed = 1; + break; + + default: png_warning(png_ptr, "Unknown zlib error"); + png_cleanup_needed = 1; + } + } + + if (png_cleanup_needed) + { + /* Clean up PNG structure and deallocate any memory. */ + png_free(png_ptr, png_ptr->zbuf); + png_ptr->zbuf = NULL; +#ifdef PNG_USER_MEM_SUPPORTED + png_destroy_struct_2((png_voidp)png_ptr, + (png_free_ptr)free_fn, (png_voidp)mem_ptr); +#else + png_destroy_struct((png_voidp)png_ptr); +#endif + return (NULL); + } + + png_ptr->zstream.next_out = png_ptr->zbuf; + png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; + + png_set_read_fn(png_ptr, NULL, NULL); + + + return (png_ptr); +} + + +#ifdef PNG_SEQUENTIAL_READ_SUPPORTED +/* Read the information before the actual image data. This has been + * changed in v0.90 to allow reading a file that already has the magic + * bytes read from the stream. You can tell libpng how many bytes have + * been read from the beginning of the stream (up to the maximum of 8) + * via png_set_sig_bytes(), and we will only check the remaining bytes + * here. The application can then have access to the signature bytes we + * read if it is determined that this isn't a valid PNG file. + */ +void PNGAPI +png_read_info(png_structp png_ptr, png_infop info_ptr) +{ + png_debug(1, "in png_read_info"); + + if (png_ptr == NULL || info_ptr == NULL) + return; + + /* Read and check the PNG file signature. */ + png_read_sig(png_ptr, info_ptr); + + for (;;) + { + PNG_IHDR; + PNG_IDAT; + PNG_IEND; + PNG_PLTE; +#ifdef PNG_READ_bKGD_SUPPORTED + PNG_bKGD; +#endif +#ifdef PNG_READ_cHRM_SUPPORTED + PNG_cHRM; +#endif +#ifdef PNG_READ_gAMA_SUPPORTED + PNG_gAMA; +#endif +#ifdef PNG_READ_hIST_SUPPORTED + PNG_hIST; +#endif +#ifdef PNG_READ_iCCP_SUPPORTED + PNG_iCCP; +#endif +#ifdef PNG_READ_iTXt_SUPPORTED + PNG_iTXt; +#endif +#ifdef PNG_READ_oFFs_SUPPORTED + PNG_oFFs; +#endif +#ifdef PNG_READ_pCAL_SUPPORTED + PNG_pCAL; +#endif +#ifdef PNG_READ_pHYs_SUPPORTED + PNG_pHYs; +#endif +#ifdef PNG_READ_sBIT_SUPPORTED + PNG_sBIT; +#endif +#ifdef PNG_READ_sCAL_SUPPORTED + PNG_sCAL; +#endif +#ifdef PNG_READ_sPLT_SUPPORTED + PNG_sPLT; +#endif +#ifdef PNG_READ_sRGB_SUPPORTED + PNG_sRGB; +#endif +#ifdef PNG_READ_tEXt_SUPPORTED + PNG_tEXt; +#endif +#ifdef PNG_READ_tIME_SUPPORTED + PNG_tIME; +#endif +#ifdef PNG_READ_tRNS_SUPPORTED + PNG_tRNS; +#endif +#ifdef PNG_READ_zTXt_SUPPORTED + PNG_zTXt; +#endif + png_uint_32 length = png_read_chunk_header(png_ptr); + PNG_CONST png_bytep chunk_name = png_ptr->chunk_name; + + /* This should be a binary subdivision search or a hash for + * matching the chunk name rather than a linear search. + */ + if (!png_memcmp(chunk_name, png_IDAT, 4)) + if (png_ptr->mode & PNG_AFTER_IDAT) + png_ptr->mode |= PNG_HAVE_CHUNK_AFTER_IDAT; + + if (!png_memcmp(chunk_name, png_IHDR, 4)) + png_handle_IHDR(png_ptr, info_ptr, length); + + else if (!png_memcmp(chunk_name, png_IEND, 4)) + png_handle_IEND(png_ptr, info_ptr, length); + +#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED + else if (png_handle_as_unknown(png_ptr, chunk_name)) + { + if (!png_memcmp(chunk_name, png_IDAT, 4)) + png_ptr->mode |= PNG_HAVE_IDAT; + + png_handle_unknown(png_ptr, info_ptr, length); + + if (!png_memcmp(chunk_name, png_PLTE, 4)) + png_ptr->mode |= PNG_HAVE_PLTE; + + else if (!png_memcmp(chunk_name, png_IDAT, 4)) + { + if (!(png_ptr->mode & PNG_HAVE_IHDR)) + png_error(png_ptr, "Missing IHDR before IDAT"); + + else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE && + !(png_ptr->mode & PNG_HAVE_PLTE)) + png_error(png_ptr, "Missing PLTE before IDAT"); + + break; + } + } +#endif + else if (!png_memcmp(chunk_name, png_PLTE, 4)) + png_handle_PLTE(png_ptr, info_ptr, length); + + else if (!png_memcmp(chunk_name, png_IDAT, 4)) + { + if (!(png_ptr->mode & PNG_HAVE_IHDR)) + png_error(png_ptr, "Missing IHDR before IDAT"); + + else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE && + !(png_ptr->mode & PNG_HAVE_PLTE)) + png_error(png_ptr, "Missing PLTE before IDAT"); + + png_ptr->idat_size = length; + png_ptr->mode |= PNG_HAVE_IDAT; + break; + } + +#ifdef PNG_READ_bKGD_SUPPORTED + else if (!png_memcmp(chunk_name, png_bKGD, 4)) + png_handle_bKGD(png_ptr, info_ptr, length); +#endif + +#ifdef PNG_READ_cHRM_SUPPORTED + else if (!png_memcmp(chunk_name, png_cHRM, 4)) + png_handle_cHRM(png_ptr, info_ptr, length); +#endif + +#ifdef PNG_READ_gAMA_SUPPORTED + else if (!png_memcmp(chunk_name, png_gAMA, 4)) + png_handle_gAMA(png_ptr, info_ptr, length); +#endif + +#ifdef PNG_READ_hIST_SUPPORTED + else if (!png_memcmp(chunk_name, png_hIST, 4)) + png_handle_hIST(png_ptr, info_ptr, length); +#endif + +#ifdef PNG_READ_oFFs_SUPPORTED + else if (!png_memcmp(chunk_name, png_oFFs, 4)) + png_handle_oFFs(png_ptr, info_ptr, length); +#endif + +#ifdef PNG_READ_pCAL_SUPPORTED + else if (!png_memcmp(chunk_name, png_pCAL, 4)) + png_handle_pCAL(png_ptr, info_ptr, length); +#endif + +#ifdef PNG_READ_sCAL_SUPPORTED + else if (!png_memcmp(chunk_name, png_sCAL, 4)) + png_handle_sCAL(png_ptr, info_ptr, length); +#endif + +#ifdef PNG_READ_pHYs_SUPPORTED + else if (!png_memcmp(chunk_name, png_pHYs, 4)) + png_handle_pHYs(png_ptr, info_ptr, length); +#endif + +#ifdef PNG_READ_sBIT_SUPPORTED + else if (!png_memcmp(chunk_name, png_sBIT, 4)) + png_handle_sBIT(png_ptr, info_ptr, length); +#endif + +#ifdef PNG_READ_sRGB_SUPPORTED + else if (!png_memcmp(chunk_name, png_sRGB, 4)) + png_handle_sRGB(png_ptr, info_ptr, length); +#endif + +#ifdef PNG_READ_iCCP_SUPPORTED + else if (!png_memcmp(chunk_name, png_iCCP, 4)) + png_handle_iCCP(png_ptr, info_ptr, length); +#endif + +#ifdef PNG_READ_sPLT_SUPPORTED + else if (!png_memcmp(chunk_name, png_sPLT, 4)) + png_handle_sPLT(png_ptr, info_ptr, length); +#endif + +#ifdef PNG_READ_tEXt_SUPPORTED + else if (!png_memcmp(chunk_name, png_tEXt, 4)) + png_handle_tEXt(png_ptr, info_ptr, length); +#endif + +#ifdef PNG_READ_tIME_SUPPORTED + else if (!png_memcmp(chunk_name, png_tIME, 4)) + png_handle_tIME(png_ptr, info_ptr, length); +#endif + +#ifdef PNG_READ_tRNS_SUPPORTED + else if (!png_memcmp(chunk_name, png_tRNS, 4)) + png_handle_tRNS(png_ptr, info_ptr, length); +#endif + +#ifdef PNG_READ_zTXt_SUPPORTED + else if (!png_memcmp(chunk_name, png_zTXt, 4)) + png_handle_zTXt(png_ptr, info_ptr, length); +#endif + +#ifdef PNG_READ_iTXt_SUPPORTED + else if (!png_memcmp(chunk_name, png_iTXt, 4)) + png_handle_iTXt(png_ptr, info_ptr, length); +#endif + + else + png_handle_unknown(png_ptr, info_ptr, length); + } +} +#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */ + +/* Optional call to update the users info_ptr structure */ +void PNGAPI +png_read_update_info(png_structp png_ptr, png_infop info_ptr) +{ + png_debug(1, "in png_read_update_info"); + + if (png_ptr == NULL) + return; + + if (!(png_ptr->flags & PNG_FLAG_ROW_INIT)) + png_read_start_row(png_ptr); + + else + png_warning(png_ptr, + "Ignoring extra png_read_update_info() call;" + " row buffer not reallocated"); + + png_read_transform_info(png_ptr, info_ptr); +} + +#ifdef PNG_SEQUENTIAL_READ_SUPPORTED +/* Initialize palette, background, etc, after transformations + * are set, but before any reading takes place. This allows + * the user to obtain a gamma-corrected palette, for example. + * If the user doesn't call this, we will do it ourselves. + */ +void PNGAPI +png_start_read_image(png_structp png_ptr) +{ + png_debug(1, "in png_start_read_image"); + + if (png_ptr == NULL) + return; + + if (!(png_ptr->flags & PNG_FLAG_ROW_INIT)) + png_read_start_row(png_ptr); + else + png_warning(png_ptr, + "Ignoring extra png_start_read_image() call;" + " row buffer not reallocated"); +} +#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */ + +#ifdef PNG_SEQUENTIAL_READ_SUPPORTED +void PNGAPI +png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row) +{ + PNG_IDAT; + PNG_CONST int png_pass_dsp_mask[7] = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, + 0xff}; + PNG_CONST int png_pass_mask[7] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff}; + int ret; + + if (png_ptr == NULL) + return; + + png_debug2(1, "in png_read_row (row %lu, pass %d)", + (unsigned long)png_ptr->row_number, png_ptr->pass); + + if (!(png_ptr->flags & PNG_FLAG_ROW_INIT)) + png_read_start_row(png_ptr); + + if (png_ptr->row_number == 0 && png_ptr->pass == 0) + { + /* Check for transforms that have been set but were defined out */ +#if defined(PNG_WRITE_INVERT_SUPPORTED) && !defined(PNG_READ_INVERT_SUPPORTED) + if (png_ptr->transformations & PNG_INVERT_MONO) + png_warning(png_ptr, "PNG_READ_INVERT_SUPPORTED is not defined"); +#endif + +#if defined(PNG_WRITE_FILLER_SUPPORTED) && !defined(PNG_READ_FILLER_SUPPORTED) + if (png_ptr->transformations & PNG_FILLER) + png_warning(png_ptr, "PNG_READ_FILLER_SUPPORTED is not defined"); +#endif + +#if defined(PNG_WRITE_PACKSWAP_SUPPORTED) && \ + !defined(PNG_READ_PACKSWAP_SUPPORTED) + if (png_ptr->transformations & PNG_PACKSWAP) + png_warning(png_ptr, "PNG_READ_PACKSWAP_SUPPORTED is not defined"); +#endif + +#if defined(PNG_WRITE_PACK_SUPPORTED) && !defined(PNG_READ_PACK_SUPPORTED) + if (png_ptr->transformations & PNG_PACK) + png_warning(png_ptr, "PNG_READ_PACK_SUPPORTED is not defined"); +#endif + +#if defined(PNG_WRITE_SHIFT_SUPPORTED) && !defined(PNG_READ_SHIFT_SUPPORTED) + if (png_ptr->transformations & PNG_SHIFT) + png_warning(png_ptr, "PNG_READ_SHIFT_SUPPORTED is not defined"); +#endif + +#if defined(PNG_WRITE_BGR_SUPPORTED) && !defined(PNG_READ_BGR_SUPPORTED) + if (png_ptr->transformations & PNG_BGR) + png_warning(png_ptr, "PNG_READ_BGR_SUPPORTED is not defined"); +#endif + +#if defined(PNG_WRITE_SWAP_SUPPORTED) && !defined(PNG_READ_SWAP_SUPPORTED) + if (png_ptr->transformations & PNG_SWAP_BYTES) + png_warning(png_ptr, "PNG_READ_SWAP_SUPPORTED is not defined"); +#endif + } + +#ifdef PNG_READ_INTERLACING_SUPPORTED + /* If interlaced and we do not need a new row, combine row and return */ + if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE)) + { + switch (png_ptr->pass) + { + case 0: + if (png_ptr->row_number & 0x07) + { + if (dsp_row != NULL) + png_combine_row(png_ptr, dsp_row, + png_pass_dsp_mask[png_ptr->pass]); + png_read_finish_row(png_ptr); + return; + } + break; + + case 1: + if ((png_ptr->row_number & 0x07) || png_ptr->width < 5) + { + if (dsp_row != NULL) + png_combine_row(png_ptr, dsp_row, + png_pass_dsp_mask[png_ptr->pass]); + + png_read_finish_row(png_ptr); + return; + } + break; + + case 2: + if ((png_ptr->row_number & 0x07) != 4) + { + if (dsp_row != NULL && (png_ptr->row_number & 4)) + png_combine_row(png_ptr, dsp_row, + png_pass_dsp_mask[png_ptr->pass]); + + png_read_finish_row(png_ptr); + return; + } + break; + + case 3: + if ((png_ptr->row_number & 3) || png_ptr->width < 3) + { + if (dsp_row != NULL) + png_combine_row(png_ptr, dsp_row, + png_pass_dsp_mask[png_ptr->pass]); + + png_read_finish_row(png_ptr); + return; + } + break; + + case 4: + if ((png_ptr->row_number & 3) != 2) + { + if (dsp_row != NULL && (png_ptr->row_number & 2)) + png_combine_row(png_ptr, dsp_row, + png_pass_dsp_mask[png_ptr->pass]); + + png_read_finish_row(png_ptr); + return; + } + break; + case 5: + if ((png_ptr->row_number & 1) || png_ptr->width < 2) + { + if (dsp_row != NULL) + png_combine_row(png_ptr, dsp_row, + png_pass_dsp_mask[png_ptr->pass]); + + png_read_finish_row(png_ptr); + return; + } + break; + + default: + case 6: + if (!(png_ptr->row_number & 1)) + { + png_read_finish_row(png_ptr); + return; + } + break; + } + } +#endif + + if (!(png_ptr->mode & PNG_HAVE_IDAT)) + png_error(png_ptr, "Invalid attempt to read row data"); + + png_ptr->zstream.next_out = png_ptr->row_buf; + png_ptr->zstream.avail_out = + (uInt)(PNG_ROWBYTES(png_ptr->pixel_depth, + png_ptr->iwidth) + 1); + + do + { + if (!(png_ptr->zstream.avail_in)) + { + while (!png_ptr->idat_size) + { + png_crc_finish(png_ptr, 0); + + png_ptr->idat_size = png_read_chunk_header(png_ptr); + if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) + png_error(png_ptr, "Not enough image data"); + } + png_ptr->zstream.avail_in = (uInt)png_ptr->zbuf_size; + png_ptr->zstream.next_in = png_ptr->zbuf; + if (png_ptr->zbuf_size > png_ptr->idat_size) + png_ptr->zstream.avail_in = (uInt)png_ptr->idat_size; + png_crc_read(png_ptr, png_ptr->zbuf, + (png_size_t)png_ptr->zstream.avail_in); + png_ptr->idat_size -= png_ptr->zstream.avail_in; + } + + ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH); + + if (ret == Z_STREAM_END) + { + if (png_ptr->zstream.avail_out || png_ptr->zstream.avail_in || + png_ptr->idat_size) + png_benign_error(png_ptr, "Extra compressed data"); + png_ptr->mode |= PNG_AFTER_IDAT; + png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED; + break; + } + + if (ret != Z_OK) + png_error(png_ptr, png_ptr->zstream.msg ? png_ptr->zstream.msg : + "Decompression error"); + + } while (png_ptr->zstream.avail_out); + + png_ptr->row_info.color_type = png_ptr->color_type; + png_ptr->row_info.width = png_ptr->iwidth; + png_ptr->row_info.channels = png_ptr->channels; + png_ptr->row_info.bit_depth = png_ptr->bit_depth; + png_ptr->row_info.pixel_depth = png_ptr->pixel_depth; + png_ptr->row_info.rowbytes = PNG_ROWBYTES(png_ptr->row_info.pixel_depth, + png_ptr->row_info.width); + + if (png_ptr->row_buf[0]) + png_read_filter_row(png_ptr, &(png_ptr->row_info), + png_ptr->row_buf + 1, png_ptr->prev_row + 1, + (int)(png_ptr->row_buf[0])); + + png_memcpy(png_ptr->prev_row, png_ptr->row_buf, png_ptr->rowbytes + 1); + +#ifdef PNG_MNG_FEATURES_SUPPORTED + if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) && + (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING)) + { + /* Intrapixel differencing */ + png_do_read_intrapixel(&(png_ptr->row_info), png_ptr->row_buf + 1); + } +#endif + + + if (png_ptr->transformations || (png_ptr->flags&PNG_FLAG_STRIP_ALPHA)) + png_do_read_transformations(png_ptr); + +#ifdef PNG_READ_INTERLACING_SUPPORTED + /* Blow up interlaced rows to full size */ + if (png_ptr->interlaced && + (png_ptr->transformations & PNG_INTERLACE)) + { + if (png_ptr->pass < 6) + /* Old interface (pre-1.0.9): + * png_do_read_interlace(&(png_ptr->row_info), + * png_ptr->row_buf + 1, png_ptr->pass, png_ptr->transformations); + */ + png_do_read_interlace(png_ptr); + + if (dsp_row != NULL) + png_combine_row(png_ptr, dsp_row, png_pass_dsp_mask[png_ptr->pass]); + + if (row != NULL) + png_combine_row(png_ptr, row, png_pass_mask[png_ptr->pass]); + } + + else +#endif + { + if (row != NULL) + png_combine_row(png_ptr, row, 0xff); + + if (dsp_row != NULL) + png_combine_row(png_ptr, dsp_row, 0xff); + } + png_read_finish_row(png_ptr); + + if (png_ptr->read_row_fn != NULL) + (*(png_ptr->read_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass); +} +#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */ + +#ifdef PNG_SEQUENTIAL_READ_SUPPORTED +/* Read one or more rows of image data. If the image is interlaced, + * and png_set_interlace_handling() has been called, the rows need to + * contain the contents of the rows from the previous pass. If the + * image has alpha or transparency, and png_handle_alpha()[*] has been + * called, the rows contents must be initialized to the contents of the + * screen. + * + * "row" holds the actual image, and pixels are placed in it + * as they arrive. If the image is displayed after each pass, it will + * appear to "sparkle" in. "display_row" can be used to display a + * "chunky" progressive image, with finer detail added as it becomes + * available. If you do not want this "chunky" display, you may pass + * NULL for display_row. If you do not want the sparkle display, and + * you have not called png_handle_alpha(), you may pass NULL for rows. + * If you have called png_handle_alpha(), and the image has either an + * alpha channel or a transparency chunk, you must provide a buffer for + * rows. In this case, you do not have to provide a display_row buffer + * also, but you may. If the image is not interlaced, or if you have + * not called png_set_interlace_handling(), the display_row buffer will + * be ignored, so pass NULL to it. + * + * [*] png_handle_alpha() does not exist yet, as of this version of libpng + */ + +void PNGAPI +png_read_rows(png_structp png_ptr, png_bytepp row, + png_bytepp display_row, png_uint_32 num_rows) +{ + png_uint_32 i; + png_bytepp rp; + png_bytepp dp; + + png_debug(1, "in png_read_rows"); + + if (png_ptr == NULL) + return; + + rp = row; + dp = display_row; + if (rp != NULL && dp != NULL) + for (i = 0; i < num_rows; i++) + { + png_bytep rptr = *rp++; + png_bytep dptr = *dp++; + + png_read_row(png_ptr, rptr, dptr); + } + + else if (rp != NULL) + for (i = 0; i < num_rows; i++) + { + png_bytep rptr = *rp; + png_read_row(png_ptr, rptr, NULL); + rp++; + } + + else if (dp != NULL) + for (i = 0; i < num_rows; i++) + { + png_bytep dptr = *dp; + png_read_row(png_ptr, NULL, dptr); + dp++; + } +} +#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */ + +#ifdef PNG_SEQUENTIAL_READ_SUPPORTED +/* Read the entire image. If the image has an alpha channel or a tRNS + * chunk, and you have called png_handle_alpha()[*], you will need to + * initialize the image to the current image that PNG will be overlaying. + * We set the num_rows again here, in case it was incorrectly set in + * png_read_start_row() by a call to png_read_update_info() or + * png_start_read_image() if png_set_interlace_handling() wasn't called + * prior to either of these functions like it should have been. You can + * only call this function once. If you desire to have an image for + * each pass of a interlaced image, use png_read_rows() instead. + * + * [*] png_handle_alpha() does not exist yet, as of this version of libpng + */ +void PNGAPI +png_read_image(png_structp png_ptr, png_bytepp image) +{ + png_uint_32 i, image_height; + int pass, j; + png_bytepp rp; + + png_debug(1, "in png_read_image"); + + if (png_ptr == NULL) + return; + +#ifdef PNG_READ_INTERLACING_SUPPORTED + if (!(png_ptr->flags & PNG_FLAG_ROW_INIT)) + { + pass = png_set_interlace_handling(png_ptr); + /* And make sure transforms are initialized. */ + png_start_read_image(png_ptr); + } + else + { + if (png_ptr->interlaced && !(png_ptr->transformations & PNG_INTERLACE)) + { + /* Caller called png_start_read_image or png_read_update_info without + * first turning on the PNG_INTERLACE transform. We can fix this here, + * but the caller should do it! + */ + png_warning(png_ptr, "Interlace handling should be turned on when " + "using png_read_image"); + /* Make sure this is set correctly */ + png_ptr->num_rows = png_ptr->height; + } + + /* Obtain the pass number, which also turns on the PNG_INTERLACE flag in + * the above error case. + */ + pass = png_set_interlace_handling(png_ptr); + } +#else + if (png_ptr->interlaced) + png_error(png_ptr, + "Cannot read interlaced image -- interlace handler disabled"); + + pass = 1; +#endif + + image_height=png_ptr->height; + + for (j = 0; j < pass; j++) + { + rp = image; + for (i = 0; i < image_height; i++) + { + png_read_row(png_ptr, *rp, NULL); + rp++; + } + } +} +#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */ + +#ifdef PNG_SEQUENTIAL_READ_SUPPORTED +/* Read the end of the PNG file. Will not read past the end of the + * file, will verify the end is accurate, and will read any comments + * or time information at the end of the file, if info is not NULL. + */ +void PNGAPI +png_read_end(png_structp png_ptr, png_infop info_ptr) +{ + png_debug(1, "in png_read_end"); + + if (png_ptr == NULL) + return; + + png_crc_finish(png_ptr, 0); /* Finish off CRC from last IDAT chunk */ + + do + { + PNG_IHDR; + PNG_IDAT; + PNG_IEND; + PNG_PLTE; +#ifdef PNG_READ_bKGD_SUPPORTED + PNG_bKGD; +#endif +#ifdef PNG_READ_cHRM_SUPPORTED + PNG_cHRM; +#endif +#ifdef PNG_READ_gAMA_SUPPORTED + PNG_gAMA; +#endif +#ifdef PNG_READ_hIST_SUPPORTED + PNG_hIST; +#endif +#ifdef PNG_READ_iCCP_SUPPORTED + PNG_iCCP; +#endif +#ifdef PNG_READ_iTXt_SUPPORTED + PNG_iTXt; +#endif +#ifdef PNG_READ_oFFs_SUPPORTED + PNG_oFFs; +#endif +#ifdef PNG_READ_pCAL_SUPPORTED + PNG_pCAL; +#endif +#ifdef PNG_READ_pHYs_SUPPORTED + PNG_pHYs; +#endif +#ifdef PNG_READ_sBIT_SUPPORTED + PNG_sBIT; +#endif +#ifdef PNG_READ_sCAL_SUPPORTED + PNG_sCAL; +#endif +#ifdef PNG_READ_sPLT_SUPPORTED + PNG_sPLT; +#endif +#ifdef PNG_READ_sRGB_SUPPORTED + PNG_sRGB; +#endif +#ifdef PNG_READ_tEXt_SUPPORTED + PNG_tEXt; +#endif +#ifdef PNG_READ_tIME_SUPPORTED + PNG_tIME; +#endif +#ifdef PNG_READ_tRNS_SUPPORTED + PNG_tRNS; +#endif +#ifdef PNG_READ_zTXt_SUPPORTED + PNG_zTXt; +#endif + png_uint_32 length = png_read_chunk_header(png_ptr); + PNG_CONST png_bytep chunk_name = png_ptr->chunk_name; + + if (!png_memcmp(chunk_name, png_IHDR, 4)) + png_handle_IHDR(png_ptr, info_ptr, length); + + else if (!png_memcmp(chunk_name, png_IEND, 4)) + png_handle_IEND(png_ptr, info_ptr, length); + +#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED + else if (png_handle_as_unknown(png_ptr, chunk_name)) + { + if (!png_memcmp(chunk_name, png_IDAT, 4)) + { + if ((length > 0) || (png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT)) + png_benign_error(png_ptr, "Too many IDATs found"); + } + png_handle_unknown(png_ptr, info_ptr, length); + if (!png_memcmp(chunk_name, png_PLTE, 4)) + png_ptr->mode |= PNG_HAVE_PLTE; + } +#endif + + else if (!png_memcmp(chunk_name, png_IDAT, 4)) + { + /* Zero length IDATs are legal after the last IDAT has been + * read, but not after other chunks have been read. + */ + if ((length > 0) || (png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT)) + png_benign_error(png_ptr, "Too many IDATs found"); + + png_crc_finish(png_ptr, length); + } + else if (!png_memcmp(chunk_name, png_PLTE, 4)) + png_handle_PLTE(png_ptr, info_ptr, length); + +#ifdef PNG_READ_bKGD_SUPPORTED + else if (!png_memcmp(chunk_name, png_bKGD, 4)) + png_handle_bKGD(png_ptr, info_ptr, length); +#endif + +#ifdef PNG_READ_cHRM_SUPPORTED + else if (!png_memcmp(chunk_name, png_cHRM, 4)) + png_handle_cHRM(png_ptr, info_ptr, length); +#endif + +#ifdef PNG_READ_gAMA_SUPPORTED + else if (!png_memcmp(chunk_name, png_gAMA, 4)) + png_handle_gAMA(png_ptr, info_ptr, length); +#endif + +#ifdef PNG_READ_hIST_SUPPORTED + else if (!png_memcmp(chunk_name, png_hIST, 4)) + png_handle_hIST(png_ptr, info_ptr, length); +#endif + +#ifdef PNG_READ_oFFs_SUPPORTED + else if (!png_memcmp(chunk_name, png_oFFs, 4)) + png_handle_oFFs(png_ptr, info_ptr, length); +#endif + +#ifdef PNG_READ_pCAL_SUPPORTED + else if (!png_memcmp(chunk_name, png_pCAL, 4)) + png_handle_pCAL(png_ptr, info_ptr, length); +#endif + +#ifdef PNG_READ_sCAL_SUPPORTED + else if (!png_memcmp(chunk_name, png_sCAL, 4)) + png_handle_sCAL(png_ptr, info_ptr, length); +#endif + +#ifdef PNG_READ_pHYs_SUPPORTED + else if (!png_memcmp(chunk_name, png_pHYs, 4)) + png_handle_pHYs(png_ptr, info_ptr, length); +#endif + +#ifdef PNG_READ_sBIT_SUPPORTED + else if (!png_memcmp(chunk_name, png_sBIT, 4)) + png_handle_sBIT(png_ptr, info_ptr, length); +#endif + +#ifdef PNG_READ_sRGB_SUPPORTED + else if (!png_memcmp(chunk_name, png_sRGB, 4)) + png_handle_sRGB(png_ptr, info_ptr, length); +#endif + +#ifdef PNG_READ_iCCP_SUPPORTED + else if (!png_memcmp(chunk_name, png_iCCP, 4)) + png_handle_iCCP(png_ptr, info_ptr, length); +#endif + +#ifdef PNG_READ_sPLT_SUPPORTED + else if (!png_memcmp(chunk_name, png_sPLT, 4)) + png_handle_sPLT(png_ptr, info_ptr, length); +#endif + +#ifdef PNG_READ_tEXt_SUPPORTED + else if (!png_memcmp(chunk_name, png_tEXt, 4)) + png_handle_tEXt(png_ptr, info_ptr, length); +#endif + +#ifdef PNG_READ_tIME_SUPPORTED + else if (!png_memcmp(chunk_name, png_tIME, 4)) + png_handle_tIME(png_ptr, info_ptr, length); +#endif + +#ifdef PNG_READ_tRNS_SUPPORTED + else if (!png_memcmp(chunk_name, png_tRNS, 4)) + png_handle_tRNS(png_ptr, info_ptr, length); +#endif + +#ifdef PNG_READ_zTXt_SUPPORTED + else if (!png_memcmp(chunk_name, png_zTXt, 4)) + png_handle_zTXt(png_ptr, info_ptr, length); +#endif + +#ifdef PNG_READ_iTXt_SUPPORTED + else if (!png_memcmp(chunk_name, png_iTXt, 4)) + png_handle_iTXt(png_ptr, info_ptr, length); +#endif + + else + png_handle_unknown(png_ptr, info_ptr, length); + } while (!(png_ptr->mode & PNG_HAVE_IEND)); +} +#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */ + +/* Free all memory used by the read */ +void PNGAPI +png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr, + png_infopp end_info_ptr_ptr) +{ + png_structp png_ptr = NULL; + png_infop info_ptr = NULL, end_info_ptr = NULL; +#ifdef PNG_USER_MEM_SUPPORTED + png_free_ptr free_fn = NULL; + png_voidp mem_ptr = NULL; +#endif + + png_debug(1, "in png_destroy_read_struct"); + + if (png_ptr_ptr != NULL) + png_ptr = *png_ptr_ptr; + if (png_ptr == NULL) + return; + +#ifdef PNG_USER_MEM_SUPPORTED + free_fn = png_ptr->free_fn; + mem_ptr = png_ptr->mem_ptr; +#endif + + if (info_ptr_ptr != NULL) + info_ptr = *info_ptr_ptr; + + if (end_info_ptr_ptr != NULL) + end_info_ptr = *end_info_ptr_ptr; + + png_read_destroy(png_ptr, info_ptr, end_info_ptr); + + if (info_ptr != NULL) + { +#ifdef PNG_TEXT_SUPPORTED + png_free_data(png_ptr, info_ptr, PNG_FREE_TEXT, -1); +#endif + +#ifdef PNG_USER_MEM_SUPPORTED + png_destroy_struct_2((png_voidp)info_ptr, (png_free_ptr)free_fn, + (png_voidp)mem_ptr); +#else + png_destroy_struct((png_voidp)info_ptr); +#endif + *info_ptr_ptr = NULL; + } + + if (end_info_ptr != NULL) + { +#ifdef PNG_READ_TEXT_SUPPORTED + png_free_data(png_ptr, end_info_ptr, PNG_FREE_TEXT, -1); +#endif +#ifdef PNG_USER_MEM_SUPPORTED + png_destroy_struct_2((png_voidp)end_info_ptr, (png_free_ptr)free_fn, + (png_voidp)mem_ptr); +#else + png_destroy_struct((png_voidp)end_info_ptr); +#endif + *end_info_ptr_ptr = NULL; + } + + if (png_ptr != NULL) + { +#ifdef PNG_USER_MEM_SUPPORTED + png_destroy_struct_2((png_voidp)png_ptr, (png_free_ptr)free_fn, + (png_voidp)mem_ptr); +#else + png_destroy_struct((png_voidp)png_ptr); +#endif + *png_ptr_ptr = NULL; + } +} + +/* Free all memory used by the read (old method) */ +void /* PRIVATE */ +png_read_destroy(png_structp png_ptr, png_infop info_ptr, + png_infop end_info_ptr) +{ +#ifdef PNG_SETJMP_SUPPORTED + jmp_buf tmp_jmp; +#endif + png_error_ptr error_fn; + png_error_ptr warning_fn; + png_voidp error_ptr; +#ifdef PNG_USER_MEM_SUPPORTED + png_free_ptr free_fn; +#endif + + png_debug(1, "in png_read_destroy"); + + if (info_ptr != NULL) + png_info_destroy(png_ptr, info_ptr); + + if (end_info_ptr != NULL) + png_info_destroy(png_ptr, end_info_ptr); + + png_free(png_ptr, png_ptr->zbuf); + png_free(png_ptr, png_ptr->big_row_buf); + png_free(png_ptr, png_ptr->prev_row); + png_free(png_ptr, png_ptr->chunkdata); + +#ifdef PNG_READ_QUANTIZE_SUPPORTED + png_free(png_ptr, png_ptr->palette_lookup); + png_free(png_ptr, png_ptr->quantize_index); +#endif + +#ifdef PNG_READ_GAMMA_SUPPORTED + png_free(png_ptr, png_ptr->gamma_table); +#endif + +#ifdef PNG_READ_BACKGROUND_SUPPORTED + png_free(png_ptr, png_ptr->gamma_from_1); + png_free(png_ptr, png_ptr->gamma_to_1); +#endif + + if (png_ptr->free_me & PNG_FREE_PLTE) + png_zfree(png_ptr, png_ptr->palette); + png_ptr->free_me &= ~PNG_FREE_PLTE; + +#if defined(PNG_tRNS_SUPPORTED) || \ + defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) + if (png_ptr->free_me & PNG_FREE_TRNS) + png_free(png_ptr, png_ptr->trans_alpha); + png_ptr->free_me &= ~PNG_FREE_TRNS; +#endif + +#ifdef PNG_READ_hIST_SUPPORTED + if (png_ptr->free_me & PNG_FREE_HIST) + png_free(png_ptr, png_ptr->hist); + png_ptr->free_me &= ~PNG_FREE_HIST; +#endif + +#ifdef PNG_READ_GAMMA_SUPPORTED + if (png_ptr->gamma_16_table != NULL) + { + int i; + int istop = (1 << (8 - png_ptr->gamma_shift)); + for (i = 0; i < istop; i++) + { + png_free(png_ptr, png_ptr->gamma_16_table[i]); + } + png_free(png_ptr, png_ptr->gamma_16_table); + } + +#ifdef PNG_READ_BACKGROUND_SUPPORTED + if (png_ptr->gamma_16_from_1 != NULL) + { + int i; + int istop = (1 << (8 - png_ptr->gamma_shift)); + for (i = 0; i < istop; i++) + { + png_free(png_ptr, png_ptr->gamma_16_from_1[i]); + } + png_free(png_ptr, png_ptr->gamma_16_from_1); + } + if (png_ptr->gamma_16_to_1 != NULL) + { + int i; + int istop = (1 << (8 - png_ptr->gamma_shift)); + for (i = 0; i < istop; i++) + { + png_free(png_ptr, png_ptr->gamma_16_to_1[i]); + } + png_free(png_ptr, png_ptr->gamma_16_to_1); + } +#endif +#endif + +#ifdef PNG_TIME_RFC1123_SUPPORTED + png_free(png_ptr, png_ptr->time_buffer); +#endif + + inflateEnd(&png_ptr->zstream); + +#ifdef PNG_PROGRESSIVE_READ_SUPPORTED + png_free(png_ptr, png_ptr->save_buffer); +#endif + +#ifdef PNG_PROGRESSIVE_READ_SUPPORTED +#ifdef PNG_TEXT_SUPPORTED + png_free(png_ptr, png_ptr->current_text); +#endif /* PNG_TEXT_SUPPORTED */ +#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ + + /* Save the important info out of the png_struct, in case it is + * being used again. + */ +#ifdef PNG_SETJMP_SUPPORTED + png_memcpy(tmp_jmp, png_ptr->png_jmpbuf, png_sizeof(jmp_buf)); +#endif + + error_fn = png_ptr->error_fn; + warning_fn = png_ptr->warning_fn; + error_ptr = png_ptr->error_ptr; +#ifdef PNG_USER_MEM_SUPPORTED + free_fn = png_ptr->free_fn; +#endif + + png_memset(png_ptr, 0, png_sizeof(png_struct)); + + png_ptr->error_fn = error_fn; + png_ptr->warning_fn = warning_fn; + png_ptr->error_ptr = error_ptr; +#ifdef PNG_USER_MEM_SUPPORTED + png_ptr->free_fn = free_fn; +#endif + +#ifdef PNG_SETJMP_SUPPORTED + png_memcpy(png_ptr->png_jmpbuf, tmp_jmp, png_sizeof(jmp_buf)); +#endif + +} + +void PNGAPI +png_set_read_status_fn(png_structp png_ptr, png_read_status_ptr read_row_fn) +{ + if (png_ptr == NULL) + return; + + png_ptr->read_row_fn = read_row_fn; +} + + +#ifdef PNG_SEQUENTIAL_READ_SUPPORTED +#ifdef PNG_INFO_IMAGE_SUPPORTED +void PNGAPI +png_read_png(png_structp png_ptr, png_infop info_ptr, + int transforms, + voidp params) +{ + int row; + + if (png_ptr == NULL) + return; + + /* png_read_info() gives us all of the information from the + * PNG file before the first IDAT (image data chunk). + */ + png_read_info(png_ptr, info_ptr); + if (info_ptr->height > PNG_UINT_32_MAX/png_sizeof(png_bytep)) + png_error(png_ptr, "Image is too high to process with png_read_png()"); + + /* -------------- image transformations start here ------------------- */ + +#ifdef PNG_READ_16_TO_8_SUPPORTED + /* Tell libpng to strip 16 bit/color files down to 8 bits per color. + */ + if (transforms & PNG_TRANSFORM_STRIP_16) + png_set_strip_16(png_ptr); +#endif + +#ifdef PNG_READ_STRIP_ALPHA_SUPPORTED + /* Strip alpha bytes from the input data without combining with + * the background (not recommended). + */ + if (transforms & PNG_TRANSFORM_STRIP_ALPHA) + png_set_strip_alpha(png_ptr); +#endif + +#if defined(PNG_READ_PACK_SUPPORTED) && !defined(PNG_READ_EXPAND_SUPPORTED) + /* Extract multiple pixels with bit depths of 1, 2, or 4 from a single + * byte into separate bytes (useful for paletted and grayscale images). + */ + if (transforms & PNG_TRANSFORM_PACKING) + png_set_packing(png_ptr); +#endif + +#ifdef PNG_READ_PACKSWAP_SUPPORTED + /* Change the order of packed pixels to least significant bit first + * (not useful if you are using png_set_packing). + */ + if (transforms & PNG_TRANSFORM_PACKSWAP) + png_set_packswap(png_ptr); +#endif + +#ifdef PNG_READ_EXPAND_SUPPORTED + /* Expand paletted colors into true RGB triplets + * Expand grayscale images to full 8 bits from 1, 2, or 4 bits/pixel + * Expand paletted or RGB images with transparency to full alpha + * channels so the data will be available as RGBA quartets. + */ + if (transforms & PNG_TRANSFORM_EXPAND) + if ((png_ptr->bit_depth < 8) || + (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) || + (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))) + png_set_expand(png_ptr); +#endif + + /* We don't handle background color or gamma transformation or quantizing. + */ + +#ifdef PNG_READ_INVERT_SUPPORTED + /* Invert monochrome files to have 0 as white and 1 as black + */ + if (transforms & PNG_TRANSFORM_INVERT_MONO) + png_set_invert_mono(png_ptr); +#endif + +#ifdef PNG_READ_SHIFT_SUPPORTED + /* If you want to shift the pixel values from the range [0,255] or + * [0,65535] to the original [0,7] or [0,31], or whatever range the + * colors were originally in: + */ + if ((transforms & PNG_TRANSFORM_SHIFT) + && png_get_valid(png_ptr, info_ptr, PNG_INFO_sBIT)) + { + png_color_8p sig_bit; + + png_get_sBIT(png_ptr, info_ptr, &sig_bit); + png_set_shift(png_ptr, sig_bit); + } +#endif + +#ifdef PNG_READ_BGR_SUPPORTED + /* Flip the RGB pixels to BGR (or RGBA to BGRA) */ + if (transforms & PNG_TRANSFORM_BGR) + png_set_bgr(png_ptr); +#endif + +#ifdef PNG_READ_SWAP_ALPHA_SUPPORTED + /* Swap the RGBA or GA data to ARGB or AG (or BGRA to ABGR) */ + if (transforms & PNG_TRANSFORM_SWAP_ALPHA) + png_set_swap_alpha(png_ptr); +#endif + +#ifdef PNG_READ_SWAP_SUPPORTED + /* Swap bytes of 16 bit files to least significant byte first */ + if (transforms & PNG_TRANSFORM_SWAP_ENDIAN) + png_set_swap(png_ptr); +#endif + +/* Added at libpng-1.2.41 */ +#ifdef PNG_READ_INVERT_ALPHA_SUPPORTED + /* Invert the alpha channel from opacity to transparency */ + if (transforms & PNG_TRANSFORM_INVERT_ALPHA) + png_set_invert_alpha(png_ptr); +#endif + +/* Added at libpng-1.2.41 */ +#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED + /* Expand grayscale image to RGB */ + if (transforms & PNG_TRANSFORM_GRAY_TO_RGB) + png_set_gray_to_rgb(png_ptr); +#endif + + /* We don't handle adding filler bytes */ + + /* Optional call to gamma correct and add the background to the palette + * and update info structure. REQUIRED if you are expecting libpng to + * update the palette for you (i.e., you selected such a transform above). + */ + png_read_update_info(png_ptr, info_ptr); + + /* -------------- image transformations end here ------------------- */ + + png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0); + if (info_ptr->row_pointers == NULL) + { + png_uint_32 iptr; + + info_ptr->row_pointers = (png_bytepp)png_malloc(png_ptr, + info_ptr->height * png_sizeof(png_bytep)); + for (iptr=0; iptrheight; iptr++) + info_ptr->row_pointers[iptr] = NULL; + + info_ptr->free_me |= PNG_FREE_ROWS; + + for (row = 0; row < (int)info_ptr->height; row++) + info_ptr->row_pointers[row] = (png_bytep)png_malloc(png_ptr, + png_get_rowbytes(png_ptr, info_ptr)); + } + + png_read_image(png_ptr, info_ptr->row_pointers); + info_ptr->valid |= PNG_INFO_IDAT; + + /* Read rest of file, and get additional chunks in info_ptr - REQUIRED */ + png_read_end(png_ptr, info_ptr); + + PNG_UNUSED(transforms) /* Quiet compiler warnings */ + PNG_UNUSED(params) + +} +#endif /* PNG_INFO_IMAGE_SUPPORTED */ +#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */ +#endif /* PNG_READ_SUPPORTED */ diff --git a/programs/develop/libraries/libpng/pngrio.c b/programs/develop/libraries/libpng/pngrio.c new file mode 100644 index 0000000000..e9c381c5ba --- /dev/null +++ b/programs/develop/libraries/libpng/pngrio.c @@ -0,0 +1,176 @@ + +/* pngrio.c - functions for data input + * + * Last changed in libpng 1.5.0 [January 6, 2011] + * Copyright (c) 1998-2011 Glenn Randers-Pehrson + * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) + * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) + * + * This code is released under the libpng license. + * For conditions of distribution and use, see the disclaimer + * and license in png.h + * + * This file provides a location for all input. Users who need + * special handling are expected to write a function that has the same + * arguments as this and performs a similar function, but that possibly + * has a different input method. Note that you shouldn't change this + * function, but rather write a replacement function and then make + * libpng use it at run time with png_set_read_fn(...). + */ + +#include "pngpriv.h" + +#ifdef PNG_READ_SUPPORTED + +/* Read the data from whatever input you are using. The default routine + * reads from a file pointer. Note that this routine sometimes gets called + * with very small lengths, so you should implement some kind of simple + * buffering if you are using unbuffered reads. This should never be asked + * to read more then 64K on a 16 bit machine. + */ +void /* PRIVATE */ +png_read_data(png_structp png_ptr, png_bytep data, png_size_t length) +{ + png_debug1(4, "reading %d bytes", (int)length); + + if (png_ptr->read_data_fn != NULL) + (*(png_ptr->read_data_fn))(png_ptr, data, length); + + else + png_error(png_ptr, "Call to NULL read function"); +} + +#ifdef PNG_STDIO_SUPPORTED +/* This is the function that does the actual reading of data. If you are + * not reading from a standard C stream, you should create a replacement + * read_data function and use it at run time with png_set_read_fn(), rather + * than changing the library. + */ +# ifndef USE_FAR_KEYWORD +void PNGCBAPI +png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length) +{ + png_size_t check; + + if (png_ptr == NULL) + return; + + /* fread() returns 0 on error, so it is OK to store this in a png_size_t + * instead of an int, which is what fread() actually returns. + */ + check = fread(data, 1, length, (png_FILE_p)png_ptr->io_ptr); + + if (check != length) + png_error(png_ptr, "Read Error"); +} +# else +/* This is the model-independent version. Since the standard I/O library + can't handle far buffers in the medium and small models, we have to copy + the data. +*/ + +#define NEAR_BUF_SIZE 1024 +#define MIN(a,b) (a <= b ? a : b) + +static void PNGCBAPI +png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length) +{ + png_size_t check; + png_byte *n_data; + png_FILE_p io_ptr; + + if (png_ptr == NULL) + return; + + /* Check if data really is near. If so, use usual code. */ + n_data = (png_byte *)CVT_PTR_NOCHECK(data); + io_ptr = (png_FILE_p)CVT_PTR(png_ptr->io_ptr); + + if ((png_bytep)n_data == data) + { + check = fread(n_data, 1, length, io_ptr); + } + + else + { + png_byte buf[NEAR_BUF_SIZE]; + png_size_t read, remaining, err; + check = 0; + remaining = length; + + do + { + read = MIN(NEAR_BUF_SIZE, remaining); + err = fread(buf, 1, read, io_ptr); + png_memcpy(data, buf, read); /* copy far buffer to near buffer */ + + if (err != read) + break; + + else + check += err; + + data += read; + remaining -= read; + } + while (remaining != 0); + } + + if ((png_uint_32)check != (png_uint_32)length) + png_error(png_ptr, "read Error"); +} +# endif +#endif + +/* This function allows the application to supply a new input function + * for libpng if standard C streams aren't being used. + * + * This function takes as its arguments: + * + * png_ptr - pointer to a png input data structure + * + * io_ptr - pointer to user supplied structure containing info about + * the input functions. May be NULL. + * + * read_data_fn - pointer to a new input function that takes as its + * arguments a pointer to a png_struct, a pointer to + * a location where input data can be stored, and a 32-bit + * unsigned int that is the number of bytes to be read. + * To exit and output any fatal error messages the new write + * function should call png_error(png_ptr, "Error msg"). + * May be NULL, in which case libpng's default function will + * be used. + */ +void PNGAPI +png_set_read_fn(png_structp png_ptr, png_voidp io_ptr, + png_rw_ptr read_data_fn) +{ + if (png_ptr == NULL) + return; + + png_ptr->io_ptr = io_ptr; + +#ifdef PNG_STDIO_SUPPORTED + if (read_data_fn != NULL) + png_ptr->read_data_fn = read_data_fn; + + else + png_ptr->read_data_fn = png_default_read_data; +#else + png_ptr->read_data_fn = read_data_fn; +#endif + + /* It is an error to write to a read device */ + if (png_ptr->write_data_fn != NULL) + { + png_ptr->write_data_fn = NULL; + png_warning(png_ptr, + "Can't set both read_data_fn and write_data_fn in the" + " same structure"); + } + +#ifdef PNG_WRITE_FLUSH_SUPPORTED + png_ptr->output_flush_fn = NULL; +#endif +} +#endif /* PNG_READ_SUPPORTED */ diff --git a/programs/develop/libraries/libpng/pngrtran.c b/programs/develop/libraries/libpng/pngrtran.c new file mode 100644 index 0000000000..e6e0c46b4d --- /dev/null +++ b/programs/develop/libraries/libpng/pngrtran.c @@ -0,0 +1,4224 @@ + +/* pngrtran.c - transforms the data in a row for PNG readers + * + * Last changed in libpng 1.5.1 [February 3, 2011] + * Copyright (c) 1998-2011 Glenn Randers-Pehrson + * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) + * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) + * + * This code is released under the libpng license. + * For conditions of distribution and use, see the disclaimer + * and license in png.h + * + * This file contains functions optionally called by an application + * in order to tell libpng how to handle data when reading a PNG. + * Transformations that are used in both reading and writing are + * in pngtrans.c. + */ + +#include "pngpriv.h" + +#ifdef PNG_READ_SUPPORTED + +/* Set the action on getting a CRC error for an ancillary or critical chunk. */ +void PNGAPI +png_set_crc_action(png_structp png_ptr, int crit_action, int ancil_action) +{ + png_debug(1, "in png_set_crc_action"); + + if (png_ptr == NULL) + return; + + /* Tell libpng how we react to CRC errors in critical chunks */ + switch (crit_action) + { + case PNG_CRC_NO_CHANGE: /* Leave setting as is */ + break; + + case PNG_CRC_WARN_USE: /* Warn/use data */ + png_ptr->flags &= ~PNG_FLAG_CRC_CRITICAL_MASK; + png_ptr->flags |= PNG_FLAG_CRC_CRITICAL_USE; + break; + + case PNG_CRC_QUIET_USE: /* Quiet/use data */ + png_ptr->flags &= ~PNG_FLAG_CRC_CRITICAL_MASK; + png_ptr->flags |= PNG_FLAG_CRC_CRITICAL_USE | + PNG_FLAG_CRC_CRITICAL_IGNORE; + break; + + case PNG_CRC_WARN_DISCARD: /* Not a valid action for critical data */ + png_warning(png_ptr, + "Can't discard critical data on CRC error"); + case PNG_CRC_ERROR_QUIT: /* Error/quit */ + + case PNG_CRC_DEFAULT: + default: + png_ptr->flags &= ~PNG_FLAG_CRC_CRITICAL_MASK; + break; + } + + /* Tell libpng how we react to CRC errors in ancillary chunks */ + switch (ancil_action) + { + case PNG_CRC_NO_CHANGE: /* Leave setting as is */ + break; + + case PNG_CRC_WARN_USE: /* Warn/use data */ + png_ptr->flags &= ~PNG_FLAG_CRC_ANCILLARY_MASK; + png_ptr->flags |= PNG_FLAG_CRC_ANCILLARY_USE; + break; + + case PNG_CRC_QUIET_USE: /* Quiet/use data */ + png_ptr->flags &= ~PNG_FLAG_CRC_ANCILLARY_MASK; + png_ptr->flags |= PNG_FLAG_CRC_ANCILLARY_USE | + PNG_FLAG_CRC_ANCILLARY_NOWARN; + break; + + case PNG_CRC_ERROR_QUIT: /* Error/quit */ + png_ptr->flags &= ~PNG_FLAG_CRC_ANCILLARY_MASK; + png_ptr->flags |= PNG_FLAG_CRC_ANCILLARY_NOWARN; + break; + + case PNG_CRC_WARN_DISCARD: /* Warn/discard data */ + + case PNG_CRC_DEFAULT: + default: + png_ptr->flags &= ~PNG_FLAG_CRC_ANCILLARY_MASK; + break; + } +} + +#ifdef PNG_READ_BACKGROUND_SUPPORTED +/* Handle alpha and tRNS via a background color */ +void PNGFAPI +png_set_background_fixed(png_structp png_ptr, + png_const_color_16p background_color, int background_gamma_code, + int need_expand, png_fixed_point background_gamma) +{ + png_debug(1, "in png_set_background_fixed"); + + if (png_ptr == NULL) + return; + + if (background_gamma_code == PNG_BACKGROUND_GAMMA_UNKNOWN) + { + png_warning(png_ptr, "Application must supply a known background gamma"); + return; + } + + png_ptr->transformations |= PNG_BACKGROUND; + png_memcpy(&(png_ptr->background), background_color, + png_sizeof(png_color_16)); + png_ptr->background_gamma = background_gamma; + png_ptr->background_gamma_type = (png_byte)(background_gamma_code); + png_ptr->transformations |= (need_expand ? PNG_BACKGROUND_EXPAND : 0); +} + +# ifdef PNG_FLOATING_POINT_SUPPORTED +void PNGAPI +png_set_background(png_structp png_ptr, + png_const_color_16p background_color, int background_gamma_code, + int need_expand, double background_gamma) +{ + png_set_background_fixed(png_ptr, background_color, background_gamma_code, + need_expand, png_fixed(png_ptr, background_gamma, "png_set_background")); +} +# endif /* FLOATING_POINT */ +#endif /* READ_BACKGROUND */ + +#ifdef PNG_READ_16_TO_8_SUPPORTED +/* Strip 16 bit depth files to 8 bit depth */ +void PNGAPI +png_set_strip_16(png_structp png_ptr) +{ + png_debug(1, "in png_set_strip_16"); + + if (png_ptr == NULL) + return; + + png_ptr->transformations |= PNG_16_TO_8; +} +#endif + +#ifdef PNG_READ_STRIP_ALPHA_SUPPORTED +void PNGAPI +png_set_strip_alpha(png_structp png_ptr) +{ + png_debug(1, "in png_set_strip_alpha"); + + if (png_ptr == NULL) + return; + + png_ptr->flags |= PNG_FLAG_STRIP_ALPHA; +} +#endif + +#ifdef PNG_READ_QUANTIZE_SUPPORTED +/* Dither file to 8 bit. Supply a palette, the current number + * of elements in the palette, the maximum number of elements + * allowed, and a histogram if possible. If the current number + * of colors is greater then the maximum number, the palette will be + * modified to fit in the maximum number. "full_quantize" indicates + * whether we need a quantizing cube set up for RGB images, or if we + * simply are reducing the number of colors in a paletted image. + */ + +typedef struct png_dsort_struct +{ + struct png_dsort_struct FAR * next; + png_byte left; + png_byte right; +} png_dsort; +typedef png_dsort FAR * png_dsortp; +typedef png_dsort FAR * FAR * png_dsortpp; + +void PNGAPI +png_set_quantize(png_structp png_ptr, png_colorp palette, + int num_palette, int maximum_colors, png_const_uint_16p histogram, + int full_quantize) +{ + png_debug(1, "in png_set_quantize"); + + if (png_ptr == NULL) + return; + + png_ptr->transformations |= PNG_QUANTIZE; + + if (!full_quantize) + { + int i; + + png_ptr->quantize_index = (png_bytep)png_malloc(png_ptr, + (png_uint_32)(num_palette * png_sizeof(png_byte))); + for (i = 0; i < num_palette; i++) + png_ptr->quantize_index[i] = (png_byte)i; + } + + if (num_palette > maximum_colors) + { + if (histogram != NULL) + { + /* This is easy enough, just throw out the least used colors. + * Perhaps not the best solution, but good enough. + */ + + int i; + + /* Initialize an array to sort colors */ + png_ptr->quantize_sort = (png_bytep)png_malloc(png_ptr, + (png_uint_32)(num_palette * png_sizeof(png_byte))); + + /* Initialize the quantize_sort array */ + for (i = 0; i < num_palette; i++) + png_ptr->quantize_sort[i] = (png_byte)i; + + /* Find the least used palette entries by starting a + * bubble sort, and running it until we have sorted + * out enough colors. Note that we don't care about + * sorting all the colors, just finding which are + * least used. + */ + + for (i = num_palette - 1; i >= maximum_colors; i--) + { + int done; /* To stop early if the list is pre-sorted */ + int j; + + done = 1; + for (j = 0; j < i; j++) + { + if (histogram[png_ptr->quantize_sort[j]] + < histogram[png_ptr->quantize_sort[j + 1]]) + { + png_byte t; + + t = png_ptr->quantize_sort[j]; + png_ptr->quantize_sort[j] = png_ptr->quantize_sort[j + 1]; + png_ptr->quantize_sort[j + 1] = t; + done = 0; + } + } + + if (done) + break; + } + + /* Swap the palette around, and set up a table, if necessary */ + if (full_quantize) + { + int j = num_palette; + + /* Put all the useful colors within the max, but don't + * move the others. + */ + for (i = 0; i < maximum_colors; i++) + { + if ((int)png_ptr->quantize_sort[i] >= maximum_colors) + { + do + j--; + while ((int)png_ptr->quantize_sort[j] >= maximum_colors); + + palette[i] = palette[j]; + } + } + } + else + { + int j = num_palette; + + /* Move all the used colors inside the max limit, and + * develop a translation table. + */ + for (i = 0; i < maximum_colors; i++) + { + /* Only move the colors we need to */ + if ((int)png_ptr->quantize_sort[i] >= maximum_colors) + { + png_color tmp_color; + + do + j--; + while ((int)png_ptr->quantize_sort[j] >= maximum_colors); + + tmp_color = palette[j]; + palette[j] = palette[i]; + palette[i] = tmp_color; + /* Indicate where the color went */ + png_ptr->quantize_index[j] = (png_byte)i; + png_ptr->quantize_index[i] = (png_byte)j; + } + } + + /* Find closest color for those colors we are not using */ + for (i = 0; i < num_palette; i++) + { + if ((int)png_ptr->quantize_index[i] >= maximum_colors) + { + int min_d, k, min_k, d_index; + + /* Find the closest color to one we threw out */ + d_index = png_ptr->quantize_index[i]; + min_d = PNG_COLOR_DIST(palette[d_index], palette[0]); + for (k = 1, min_k = 0; k < maximum_colors; k++) + { + int d; + + d = PNG_COLOR_DIST(palette[d_index], palette[k]); + + if (d < min_d) + { + min_d = d; + min_k = k; + } + } + /* Point to closest color */ + png_ptr->quantize_index[i] = (png_byte)min_k; + } + } + } + png_free(png_ptr, png_ptr->quantize_sort); + png_ptr->quantize_sort = NULL; + } + else + { + /* This is much harder to do simply (and quickly). Perhaps + * we need to go through a median cut routine, but those + * don't always behave themselves with only a few colors + * as input. So we will just find the closest two colors, + * and throw out one of them (chosen somewhat randomly). + * [We don't understand this at all, so if someone wants to + * work on improving it, be our guest - AED, GRP] + */ + int i; + int max_d; + int num_new_palette; + png_dsortp t; + png_dsortpp hash; + + t = NULL; + + /* Initialize palette index arrays */ + png_ptr->index_to_palette = (png_bytep)png_malloc(png_ptr, + (png_uint_32)(num_palette * png_sizeof(png_byte))); + png_ptr->palette_to_index = (png_bytep)png_malloc(png_ptr, + (png_uint_32)(num_palette * png_sizeof(png_byte))); + + /* Initialize the sort array */ + for (i = 0; i < num_palette; i++) + { + png_ptr->index_to_palette[i] = (png_byte)i; + png_ptr->palette_to_index[i] = (png_byte)i; + } + + hash = (png_dsortpp)png_calloc(png_ptr, (png_uint_32)(769 * + png_sizeof(png_dsortp))); + + num_new_palette = num_palette; + + /* Initial wild guess at how far apart the farthest pixel + * pair we will be eliminating will be. Larger + * numbers mean more areas will be allocated, Smaller + * numbers run the risk of not saving enough data, and + * having to do this all over again. + * + * I have not done extensive checking on this number. + */ + max_d = 96; + + while (num_new_palette > maximum_colors) + { + for (i = 0; i < num_new_palette - 1; i++) + { + int j; + + for (j = i + 1; j < num_new_palette; j++) + { + int d; + + d = PNG_COLOR_DIST(palette[i], palette[j]); + + if (d <= max_d) + { + + t = (png_dsortp)png_malloc_warn(png_ptr, + (png_uint_32)(png_sizeof(png_dsort))); + + if (t == NULL) + break; + + t->next = hash[d]; + t->left = (png_byte)i; + t->right = (png_byte)j; + hash[d] = t; + } + } + if (t == NULL) + break; + } + + if (t != NULL) + for (i = 0; i <= max_d; i++) + { + if (hash[i] != NULL) + { + png_dsortp p; + + for (p = hash[i]; p; p = p->next) + { + if ((int)png_ptr->index_to_palette[p->left] + < num_new_palette && + (int)png_ptr->index_to_palette[p->right] + < num_new_palette) + { + int j, next_j; + + if (num_new_palette & 0x01) + { + j = p->left; + next_j = p->right; + } + else + { + j = p->right; + next_j = p->left; + } + + num_new_palette--; + palette[png_ptr->index_to_palette[j]] + = palette[num_new_palette]; + if (!full_quantize) + { + int k; + + for (k = 0; k < num_palette; k++) + { + if (png_ptr->quantize_index[k] == + png_ptr->index_to_palette[j]) + png_ptr->quantize_index[k] = + png_ptr->index_to_palette[next_j]; + + if ((int)png_ptr->quantize_index[k] == + num_new_palette) + png_ptr->quantize_index[k] = + png_ptr->index_to_palette[j]; + } + } + + png_ptr->index_to_palette[png_ptr->palette_to_index + [num_new_palette]] = png_ptr->index_to_palette[j]; + + png_ptr->palette_to_index[png_ptr->index_to_palette[j]] + = png_ptr->palette_to_index[num_new_palette]; + + png_ptr->index_to_palette[j] = + (png_byte)num_new_palette; + + png_ptr->palette_to_index[num_new_palette] = + (png_byte)j; + } + if (num_new_palette <= maximum_colors) + break; + } + if (num_new_palette <= maximum_colors) + break; + } + } + + for (i = 0; i < 769; i++) + { + if (hash[i] != NULL) + { + png_dsortp p = hash[i]; + while (p) + { + t = p->next; + png_free(png_ptr, p); + p = t; + } + } + hash[i] = 0; + } + max_d += 96; + } + png_free(png_ptr, hash); + png_free(png_ptr, png_ptr->palette_to_index); + png_free(png_ptr, png_ptr->index_to_palette); + png_ptr->palette_to_index = NULL; + png_ptr->index_to_palette = NULL; + } + num_palette = maximum_colors; + } + if (png_ptr->palette == NULL) + { + png_ptr->palette = palette; + } + png_ptr->num_palette = (png_uint_16)num_palette; + + if (full_quantize) + { + int i; + png_bytep distance; + int total_bits = PNG_QUANTIZE_RED_BITS + PNG_QUANTIZE_GREEN_BITS + + PNG_QUANTIZE_BLUE_BITS; + int num_red = (1 << PNG_QUANTIZE_RED_BITS); + int num_green = (1 << PNG_QUANTIZE_GREEN_BITS); + int num_blue = (1 << PNG_QUANTIZE_BLUE_BITS); + png_size_t num_entries = ((png_size_t)1 << total_bits); + + png_ptr->palette_lookup = (png_bytep)png_calloc(png_ptr, + (png_uint_32)(num_entries * png_sizeof(png_byte))); + + distance = (png_bytep)png_malloc(png_ptr, (png_uint_32)(num_entries * + png_sizeof(png_byte))); + + png_memset(distance, 0xff, num_entries * png_sizeof(png_byte)); + + for (i = 0; i < num_palette; i++) + { + int ir, ig, ib; + int r = (palette[i].red >> (8 - PNG_QUANTIZE_RED_BITS)); + int g = (palette[i].green >> (8 - PNG_QUANTIZE_GREEN_BITS)); + int b = (palette[i].blue >> (8 - PNG_QUANTIZE_BLUE_BITS)); + + for (ir = 0; ir < num_red; ir++) + { + /* int dr = abs(ir - r); */ + int dr = ((ir > r) ? ir - r : r - ir); + int index_r = (ir << (PNG_QUANTIZE_BLUE_BITS + + PNG_QUANTIZE_GREEN_BITS)); + + for (ig = 0; ig < num_green; ig++) + { + /* int dg = abs(ig - g); */ + int dg = ((ig > g) ? ig - g : g - ig); + int dt = dr + dg; + int dm = ((dr > dg) ? dr : dg); + int index_g = index_r | (ig << PNG_QUANTIZE_BLUE_BITS); + + for (ib = 0; ib < num_blue; ib++) + { + int d_index = index_g | ib; + /* int db = abs(ib - b); */ + int db = ((ib > b) ? ib - b : b - ib); + int dmax = ((dm > db) ? dm : db); + int d = dmax + dt + db; + + if (d < (int)distance[d_index]) + { + distance[d_index] = (png_byte)d; + png_ptr->palette_lookup[d_index] = (png_byte)i; + } + } + } + } + } + + png_free(png_ptr, distance); + } +} +#endif /* PNG_READ_QUANTIZE_SUPPORTED */ + +#ifdef PNG_READ_GAMMA_SUPPORTED +/* Transform the image from the file_gamma to the screen_gamma. We + * only do transformations on images where the file_gamma and screen_gamma + * are not close reciprocals, otherwise it slows things down slightly, and + * also needlessly introduces small errors. + * + * We will turn off gamma transformation later if no semitransparent entries + * are present in the tRNS array for palette images. We can't do it here + * because we don't necessarily have the tRNS chunk yet. + */ +static int /* PRIVATE */ +png_gamma_threshold(png_fixed_point scrn_gamma, png_fixed_point file_gamma) +{ + /* PNG_GAMMA_THRESHOLD is the threshold for performing gamma + * correction as a difference of the overall transform from 1.0 + * + * We want to compare the threshold with s*f - 1, if we get + * overflow here it is because of wacky gamma values so we + * turn on processing anyway. + */ + png_fixed_point gtest; + return !png_muldiv(>est, scrn_gamma, file_gamma, PNG_FP_1) || + png_gamma_significant(gtest); +} + +void PNGFAPI +png_set_gamma_fixed(png_structp png_ptr, png_fixed_point scrn_gamma, + png_fixed_point file_gamma) +{ + png_debug(1, "in png_set_gamma_fixed"); + + if (png_ptr == NULL) + return; + + if ((png_ptr->color_type & PNG_COLOR_MASK_ALPHA) || + (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) || + png_gamma_threshold(scrn_gamma, file_gamma)) + png_ptr->transformations |= PNG_GAMMA; + png_ptr->gamma = file_gamma; + png_ptr->screen_gamma = scrn_gamma; +} + +# ifdef PNG_FLOATING_POINT_SUPPORTED +void PNGAPI +png_set_gamma(png_structp png_ptr, double scrn_gamma, double file_gamma) +{ + png_set_gamma_fixed(png_ptr, + png_fixed(png_ptr, scrn_gamma, "png_set_gamma screen gamma"), + png_fixed(png_ptr, file_gamma, "png_set_gamma file gamma")); +} +# endif /* FLOATING_POINT_SUPPORTED */ +#endif /* READ_GAMMA */ + +#ifdef PNG_READ_EXPAND_SUPPORTED +/* Expand paletted images to RGB, expand grayscale images of + * less than 8-bit depth to 8-bit depth, and expand tRNS chunks + * to alpha channels. + */ +void PNGAPI +png_set_expand(png_structp png_ptr) +{ + png_debug(1, "in png_set_expand"); + + if (png_ptr == NULL) + return; + + png_ptr->transformations |= (PNG_EXPAND | PNG_EXPAND_tRNS); + png_ptr->flags &= ~PNG_FLAG_ROW_INIT; +} + +/* GRR 19990627: the following three functions currently are identical + * to png_set_expand(). However, it is entirely reasonable that someone + * might wish to expand an indexed image to RGB but *not* expand a single, + * fully transparent palette entry to a full alpha channel--perhaps instead + * convert tRNS to the grayscale/RGB format (16-bit RGB value), or replace + * the transparent color with a particular RGB value, or drop tRNS entirely. + * IOW, a future version of the library may make the transformations flag + * a bit more fine-grained, with separate bits for each of these three + * functions. + * + * More to the point, these functions make it obvious what libpng will be + * doing, whereas "expand" can (and does) mean any number of things. + * + * GRP 20060307: In libpng-1.2.9, png_set_gray_1_2_4_to_8() was modified + * to expand only the sample depth but not to expand the tRNS to alpha + * and its name was changed to png_set_expand_gray_1_2_4_to_8(). + */ + +/* Expand paletted images to RGB. */ +void PNGAPI +png_set_palette_to_rgb(png_structp png_ptr) +{ + png_debug(1, "in png_set_palette_to_rgb"); + + if (png_ptr == NULL) + return; + + png_ptr->transformations |= (PNG_EXPAND | PNG_EXPAND_tRNS); + png_ptr->flags &= ~PNG_FLAG_ROW_INIT; +} + +/* Expand grayscale images of less than 8-bit depth to 8 bits. */ +void PNGAPI +png_set_expand_gray_1_2_4_to_8(png_structp png_ptr) +{ + png_debug(1, "in png_set_expand_gray_1_2_4_to_8"); + + if (png_ptr == NULL) + return; + + png_ptr->transformations |= PNG_EXPAND; + png_ptr->flags &= ~PNG_FLAG_ROW_INIT; +} + + + +/* Expand tRNS chunks to alpha channels. */ +void PNGAPI +png_set_tRNS_to_alpha(png_structp png_ptr) +{ + png_debug(1, "in png_set_tRNS_to_alpha"); + + png_ptr->transformations |= (PNG_EXPAND | PNG_EXPAND_tRNS); + png_ptr->flags &= ~PNG_FLAG_ROW_INIT; +} +#endif /* defined(PNG_READ_EXPAND_SUPPORTED) */ + +#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED +void PNGAPI +png_set_gray_to_rgb(png_structp png_ptr) +{ + png_debug(1, "in png_set_gray_to_rgb"); + + if (png_ptr != NULL) + { + /* Because rgb must be 8 bits or more: */ + png_set_expand_gray_1_2_4_to_8(png_ptr); + png_ptr->transformations |= PNG_GRAY_TO_RGB; + png_ptr->flags &= ~PNG_FLAG_ROW_INIT; + } +} +#endif + +#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED +void PNGFAPI +png_set_rgb_to_gray_fixed(png_structp png_ptr, int error_action, + png_fixed_point red, png_fixed_point green) +{ + png_debug(1, "in png_set_rgb_to_gray"); + + if (png_ptr == NULL) + return; + + switch(error_action) + { + case 1: + png_ptr->transformations |= PNG_RGB_TO_GRAY; + break; + + case 2: + png_ptr->transformations |= PNG_RGB_TO_GRAY_WARN; + break; + + case 3: + png_ptr->transformations |= PNG_RGB_TO_GRAY_ERR; + break; + + default: + png_error(png_ptr, "invalid error action to rgb_to_gray"); + break; + } + if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) +#ifdef PNG_READ_EXPAND_SUPPORTED + png_ptr->transformations |= PNG_EXPAND; +#else + { + png_warning(png_ptr, + "Cannot do RGB_TO_GRAY without EXPAND_SUPPORTED"); + + png_ptr->transformations &= ~PNG_RGB_TO_GRAY; + } +#endif + { + png_uint_16 red_int, green_int; + if (red < 0 || green < 0) + { + red_int = 6968; /* .212671 * 32768 + .5 */ + green_int = 23434; /* .715160 * 32768 + .5 */ + } + + else if (red + green < 100000L) + { + red_int = (png_uint_16)(((png_uint_32)red*32768L)/100000L); + green_int = (png_uint_16)(((png_uint_32)green*32768L)/100000L); + } + + else + { + png_warning(png_ptr, "ignoring out of range rgb_to_gray coefficients"); + red_int = 6968; + green_int = 23434; + } + + png_ptr->rgb_to_gray_red_coeff = red_int; + png_ptr->rgb_to_gray_green_coeff = green_int; + png_ptr->rgb_to_gray_blue_coeff = + (png_uint_16)(32768 - red_int - green_int); + } +} + +#ifdef PNG_FLOATING_POINT_SUPPORTED +/* Convert a RGB image to a grayscale of the same width. This allows us, + * for example, to convert a 24 bpp RGB image into an 8 bpp grayscale image. + */ + +void PNGAPI +png_set_rgb_to_gray(png_structp png_ptr, int error_action, double red, + double green) +{ + if (png_ptr == NULL) + return; + + png_set_rgb_to_gray_fixed(png_ptr, error_action, + png_fixed(png_ptr, red, "rgb to gray red coefficient"), + png_fixed(png_ptr, green, "rgb to gray green coefficient")); +} +#endif /* FLOATING POINT */ + +#endif + +#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ + defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) +void PNGAPI +png_set_read_user_transform_fn(png_structp png_ptr, png_user_transform_ptr + read_user_transform_fn) +{ + png_debug(1, "in png_set_read_user_transform_fn"); + + if (png_ptr == NULL) + return; + +#ifdef PNG_READ_USER_TRANSFORM_SUPPORTED + png_ptr->transformations |= PNG_USER_TRANSFORM; + png_ptr->read_user_transform_fn = read_user_transform_fn; +#endif +} +#endif + +/* Initialize everything needed for the read. This includes modifying + * the palette. + */ +void /* PRIVATE */ +png_init_read_transformations(png_structp png_ptr) +{ + png_debug(1, "in png_init_read_transformations"); + + { +#if defined(PNG_READ_BACKGROUND_SUPPORTED) || \ + defined(PNG_READ_SHIFT_SUPPORTED) || \ + defined(PNG_READ_GAMMA_SUPPORTED) + int color_type = png_ptr->color_type; +#endif + +#if defined(PNG_READ_EXPAND_SUPPORTED) && defined(PNG_READ_BACKGROUND_SUPPORTED) + +#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED + /* Detect gray background and attempt to enable optimization + * for gray --> RGB case + * + * Note: if PNG_BACKGROUND_EXPAND is set and color_type is either RGB or + * RGB_ALPHA (in which case need_expand is superfluous anyway), the + * background color might actually be gray yet not be flagged as such. + * This is not a problem for the current code, which uses + * PNG_BACKGROUND_IS_GRAY only to decide when to do the + * png_do_gray_to_rgb() transformation. + */ + if ((png_ptr->transformations & PNG_BACKGROUND_EXPAND) && + !(color_type & PNG_COLOR_MASK_COLOR)) + { + png_ptr->mode |= PNG_BACKGROUND_IS_GRAY; + } + + else if ((png_ptr->transformations & PNG_BACKGROUND) && + !(png_ptr->transformations & PNG_BACKGROUND_EXPAND) && + (png_ptr->transformations & PNG_GRAY_TO_RGB) && + png_ptr->background.red == png_ptr->background.green && + png_ptr->background.red == png_ptr->background.blue) + { + png_ptr->mode |= PNG_BACKGROUND_IS_GRAY; + png_ptr->background.gray = png_ptr->background.red; + } +#endif + + if ((png_ptr->transformations & PNG_BACKGROUND_EXPAND) && + (png_ptr->transformations & PNG_EXPAND)) + { + if (!(color_type & PNG_COLOR_MASK_COLOR)) /* i.e., GRAY or GRAY_ALPHA */ + { + /* Expand background and tRNS chunks */ + switch (png_ptr->bit_depth) + { + case 1: + png_ptr->background.gray *= (png_uint_16)0xff; + png_ptr->background.red = png_ptr->background.green + = png_ptr->background.blue = png_ptr->background.gray; + if (!(png_ptr->transformations & PNG_EXPAND_tRNS)) + { + png_ptr->trans_color.gray *= (png_uint_16)0xff; + png_ptr->trans_color.red = png_ptr->trans_color.green + = png_ptr->trans_color.blue = png_ptr->trans_color.gray; + } + break; + + case 2: + png_ptr->background.gray *= (png_uint_16)0x55; + png_ptr->background.red = png_ptr->background.green + = png_ptr->background.blue = png_ptr->background.gray; + if (!(png_ptr->transformations & PNG_EXPAND_tRNS)) + { + png_ptr->trans_color.gray *= (png_uint_16)0x55; + png_ptr->trans_color.red = png_ptr->trans_color.green + = png_ptr->trans_color.blue = png_ptr->trans_color.gray; + } + break; + + case 4: + png_ptr->background.gray *= (png_uint_16)0x11; + png_ptr->background.red = png_ptr->background.green + = png_ptr->background.blue = png_ptr->background.gray; + if (!(png_ptr->transformations & PNG_EXPAND_tRNS)) + { + png_ptr->trans_color.gray *= (png_uint_16)0x11; + png_ptr->trans_color.red = png_ptr->trans_color.green + = png_ptr->trans_color.blue = png_ptr->trans_color.gray; + } + break; + + default: + + case 8: + + case 16: + png_ptr->background.red = png_ptr->background.green + = png_ptr->background.blue = png_ptr->background.gray; + break; + } + } + else if (color_type == PNG_COLOR_TYPE_PALETTE) + { + png_ptr->background.red = + png_ptr->palette[png_ptr->background.index].red; + png_ptr->background.green = + png_ptr->palette[png_ptr->background.index].green; + png_ptr->background.blue = + png_ptr->palette[png_ptr->background.index].blue; + +#ifdef PNG_READ_INVERT_ALPHA_SUPPORTED + if (png_ptr->transformations & PNG_INVERT_ALPHA) + { +#ifdef PNG_READ_EXPAND_SUPPORTED + if (!(png_ptr->transformations & PNG_EXPAND_tRNS)) +#endif + { + /* Invert the alpha channel (in tRNS) unless the pixels are + * going to be expanded, in which case leave it for later + */ + int i, istop; + istop=(int)png_ptr->num_trans; + for (i=0; itrans_alpha[i] = (png_byte)(255 - + png_ptr->trans_alpha[i]); + } + } +#endif + + } + } +#endif + +#if defined(PNG_READ_BACKGROUND_SUPPORTED) && defined(PNG_READ_GAMMA_SUPPORTED) + png_ptr->background_1 = png_ptr->background; +#endif +#ifdef PNG_READ_GAMMA_SUPPORTED + + if ((color_type == PNG_COLOR_TYPE_PALETTE && png_ptr->num_trans != 0) + && png_gamma_threshold(png_ptr->screen_gamma, png_ptr->gamma)) + { + int i, k; + k=0; + for (i=0; inum_trans; i++) + { + if (png_ptr->trans_alpha[i] != 0 && png_ptr->trans_alpha[i] != 0xff) + k=1; /* Partial transparency is present */ + } + if (k == 0) + png_ptr->transformations &= ~PNG_GAMMA; + } + + if ((png_ptr->transformations & (PNG_GAMMA | PNG_RGB_TO_GRAY)) && + png_ptr->gamma != 0) + { + png_build_gamma_table(png_ptr, png_ptr->bit_depth); + +#ifdef PNG_READ_BACKGROUND_SUPPORTED + if (png_ptr->transformations & PNG_BACKGROUND) + { + if (color_type == PNG_COLOR_TYPE_PALETTE) + { + /* Could skip if no transparency */ + png_color back, back_1; + png_colorp palette = png_ptr->palette; + int num_palette = png_ptr->num_palette; + int i; + if (png_ptr->background_gamma_type == PNG_BACKGROUND_GAMMA_FILE) + { + + back.red = png_ptr->gamma_table[png_ptr->background.red]; + back.green = png_ptr->gamma_table[png_ptr->background.green]; + back.blue = png_ptr->gamma_table[png_ptr->background.blue]; + + back_1.red = png_ptr->gamma_to_1[png_ptr->background.red]; + back_1.green = png_ptr->gamma_to_1[png_ptr->background.green]; + back_1.blue = png_ptr->gamma_to_1[png_ptr->background.blue]; + } + else + { + png_fixed_point g, gs; + + switch (png_ptr->background_gamma_type) + { + case PNG_BACKGROUND_GAMMA_SCREEN: + g = (png_ptr->screen_gamma); + gs = PNG_FP_1; + break; + + case PNG_BACKGROUND_GAMMA_FILE: + g = png_reciprocal(png_ptr->gamma); + gs = png_reciprocal2(png_ptr->gamma, + png_ptr->screen_gamma); + break; + + case PNG_BACKGROUND_GAMMA_UNIQUE: + g = png_reciprocal(png_ptr->background_gamma); + gs = png_reciprocal2(png_ptr->background_gamma, + png_ptr->screen_gamma); + break; + default: + g = PNG_FP_1; /* back_1 */ + gs = PNG_FP_1; /* back */ + break; + } + + if (png_gamma_significant(gs)) + { + back.red = (png_byte)png_ptr->background.red; + back.green = (png_byte)png_ptr->background.green; + back.blue = (png_byte)png_ptr->background.blue; + } + + else + { + back.red = png_gamma_8bit_correct(png_ptr->background.red, + gs); + back.green = png_gamma_8bit_correct(png_ptr->background.green, + gs); + back.blue = png_gamma_8bit_correct(png_ptr->background.blue, + gs); + } + back_1.red = png_gamma_8bit_correct(png_ptr->background.red, g); + back_1.green = png_gamma_8bit_correct(png_ptr->background.green, + g); + back_1.blue = png_gamma_8bit_correct(png_ptr->background.blue, + g); + } + for (i = 0; i < num_palette; i++) + { + if (i < (int)png_ptr->num_trans && + png_ptr->trans_alpha[i] != 0xff) + { + if (png_ptr->trans_alpha[i] == 0) + { + palette[i] = back; + } + else /* if (png_ptr->trans_alpha[i] != 0xff) */ + { + png_byte v, w; + + v = png_ptr->gamma_to_1[palette[i].red]; + png_composite(w, v, png_ptr->trans_alpha[i], back_1.red); + palette[i].red = png_ptr->gamma_from_1[w]; + + v = png_ptr->gamma_to_1[palette[i].green]; + png_composite(w, v, png_ptr->trans_alpha[i], back_1.green); + palette[i].green = png_ptr->gamma_from_1[w]; + + v = png_ptr->gamma_to_1[palette[i].blue]; + png_composite(w, v, png_ptr->trans_alpha[i], back_1.blue); + palette[i].blue = png_ptr->gamma_from_1[w]; + } + } + else + { + palette[i].red = png_ptr->gamma_table[palette[i].red]; + palette[i].green = png_ptr->gamma_table[palette[i].green]; + palette[i].blue = png_ptr->gamma_table[palette[i].blue]; + } + } + /* Prevent the transformations being done again, and make sure + * that the now spurious alpha channel is stripped - the code + * has just reduced background composition and gamma correction + * to a simple alpha channel strip. + */ + png_ptr->transformations &= ~PNG_BACKGROUND; + png_ptr->transformations &= ~PNG_GAMMA; + png_ptr->flags |= PNG_FLAG_STRIP_ALPHA; + } + + /* if (png_ptr->background_gamma_type!=PNG_BACKGROUND_GAMMA_UNKNOWN) */ + else + /* color_type != PNG_COLOR_TYPE_PALETTE */ + { + png_fixed_point g = PNG_FP_1; + png_fixed_point gs = PNG_FP_1; + + switch (png_ptr->background_gamma_type) + { + case PNG_BACKGROUND_GAMMA_SCREEN: + g = png_ptr->screen_gamma; + /* gs = PNG_FP_1; */ + break; + + case PNG_BACKGROUND_GAMMA_FILE: + g = png_reciprocal(png_ptr->gamma); + gs = png_reciprocal2(png_ptr->gamma, png_ptr->screen_gamma); + break; + + case PNG_BACKGROUND_GAMMA_UNIQUE: + g = png_reciprocal(png_ptr->background_gamma); + gs = png_reciprocal2(png_ptr->background_gamma, + png_ptr->screen_gamma); + break; + + default: + png_error(png_ptr, "invalid background gamma type"); + } + + png_ptr->background_1.gray = png_gamma_correct(png_ptr, + png_ptr->background.gray, g); + + png_ptr->background.gray = png_gamma_correct(png_ptr, + png_ptr->background.gray, gs); + + if ((png_ptr->background.red != png_ptr->background.green) || + (png_ptr->background.red != png_ptr->background.blue) || + (png_ptr->background.red != png_ptr->background.gray)) + { + /* RGB or RGBA with color background */ + png_ptr->background_1.red = png_gamma_correct(png_ptr, + png_ptr->background.red, g); + + png_ptr->background_1.green = png_gamma_correct(png_ptr, + png_ptr->background.green, g); + + png_ptr->background_1.blue = png_gamma_correct(png_ptr, + png_ptr->background.blue, g); + + png_ptr->background.red = png_gamma_correct(png_ptr, + png_ptr->background.red, gs); + + png_ptr->background.green = png_gamma_correct(png_ptr, + png_ptr->background.green, gs); + + png_ptr->background.blue = png_gamma_correct(png_ptr, + png_ptr->background.blue, gs); + } + + else + { + /* GRAY, GRAY ALPHA, RGB, or RGBA with gray background */ + png_ptr->background_1.red = png_ptr->background_1.green + = png_ptr->background_1.blue = png_ptr->background_1.gray; + + png_ptr->background.red = png_ptr->background.green + = png_ptr->background.blue = png_ptr->background.gray; + } + } + } + else + /* Transformation does not include PNG_BACKGROUND */ +#endif /* PNG_READ_BACKGROUND_SUPPORTED */ + if (color_type == PNG_COLOR_TYPE_PALETTE) + { + png_colorp palette = png_ptr->palette; + int num_palette = png_ptr->num_palette; + int i; + + for (i = 0; i < num_palette; i++) + { + palette[i].red = png_ptr->gamma_table[palette[i].red]; + palette[i].green = png_ptr->gamma_table[palette[i].green]; + palette[i].blue = png_ptr->gamma_table[palette[i].blue]; + } + + /* Done the gamma correction. */ + png_ptr->transformations &= ~PNG_GAMMA; + } + } +#ifdef PNG_READ_BACKGROUND_SUPPORTED + else +#endif +#endif /* PNG_READ_GAMMA_SUPPORTED */ +#ifdef PNG_READ_BACKGROUND_SUPPORTED + /* No GAMMA transformation */ + if ((png_ptr->transformations & PNG_BACKGROUND) && + (color_type == PNG_COLOR_TYPE_PALETTE)) + { + int i; + int istop = (int)png_ptr->num_trans; + png_color back; + png_colorp palette = png_ptr->palette; + + back.red = (png_byte)png_ptr->background.red; + back.green = (png_byte)png_ptr->background.green; + back.blue = (png_byte)png_ptr->background.blue; + + for (i = 0; i < istop; i++) + { + if (png_ptr->trans_alpha[i] == 0) + { + palette[i] = back; + } + + else if (png_ptr->trans_alpha[i] != 0xff) + { + /* The png_composite() macro is defined in png.h */ + png_composite(palette[i].red, palette[i].red, + png_ptr->trans_alpha[i], back.red); + + png_composite(palette[i].green, palette[i].green, + png_ptr->trans_alpha[i], back.green); + + png_composite(palette[i].blue, palette[i].blue, + png_ptr->trans_alpha[i], back.blue); + } + } + + /* Handled alpha, still need to strip the channel. */ + png_ptr->transformations &= ~PNG_BACKGROUND; + png_ptr->flags |= PNG_FLAG_STRIP_ALPHA; + } +#endif /* PNG_READ_BACKGROUND_SUPPORTED */ + +#ifdef PNG_READ_SHIFT_SUPPORTED + if ((png_ptr->transformations & PNG_SHIFT) && + (color_type == PNG_COLOR_TYPE_PALETTE)) + { + png_uint_16 i; + png_uint_16 istop = png_ptr->num_palette; + int sr = 8 - png_ptr->sig_bit.red; + int sg = 8 - png_ptr->sig_bit.green; + int sb = 8 - png_ptr->sig_bit.blue; + + if (sr < 0 || sr > 8) + sr = 0; + + if (sg < 0 || sg > 8) + sg = 0; + + if (sb < 0 || sb > 8) + sb = 0; + + for (i = 0; i < istop; i++) + { + png_ptr->palette[i].red >>= sr; + png_ptr->palette[i].green >>= sg; + png_ptr->palette[i].blue >>= sb; + } + } +#endif /* PNG_READ_SHIFT_SUPPORTED */ + } +#if !defined(PNG_READ_GAMMA_SUPPORTED) && !defined(PNG_READ_SHIFT_SUPPORTED) \ + && !defined(PNG_READ_BACKGROUND_SUPPORTED) + if (png_ptr) + return; +#endif +} + +/* Modify the info structure to reflect the transformations. The + * info should be updated so a PNG file could be written with it, + * assuming the transformations result in valid PNG data. + */ +void /* PRIVATE */ +png_read_transform_info(png_structp png_ptr, png_infop info_ptr) +{ + png_debug(1, "in png_read_transform_info"); + +#ifdef PNG_READ_EXPAND_SUPPORTED + if (png_ptr->transformations & PNG_EXPAND) + { + if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) + { + if (png_ptr->num_trans && + (png_ptr->transformations & PNG_EXPAND_tRNS)) + info_ptr->color_type = PNG_COLOR_TYPE_RGB_ALPHA; + + else + info_ptr->color_type = PNG_COLOR_TYPE_RGB; + + info_ptr->bit_depth = 8; + info_ptr->num_trans = 0; + } + else + { + if (png_ptr->num_trans) + { + if (png_ptr->transformations & PNG_EXPAND_tRNS) + info_ptr->color_type |= PNG_COLOR_MASK_ALPHA; + } + if (info_ptr->bit_depth < 8) + info_ptr->bit_depth = 8; + + info_ptr->num_trans = 0; + } + } +#endif + +#ifdef PNG_READ_BACKGROUND_SUPPORTED + if (png_ptr->transformations & PNG_BACKGROUND) + { + info_ptr->color_type = (png_byte)(info_ptr->color_type & + ~PNG_COLOR_MASK_ALPHA); + info_ptr->num_trans = 0; + info_ptr->background = png_ptr->background; + } +#endif + +#ifdef PNG_READ_GAMMA_SUPPORTED + if (png_ptr->transformations & PNG_GAMMA) + { + info_ptr->gamma = png_ptr->gamma; + } +#endif + +#ifdef PNG_READ_16_TO_8_SUPPORTED +#ifdef PNG_READ_16BIT_SUPPORTED + if ((png_ptr->transformations & PNG_16_TO_8) && (info_ptr->bit_depth == 16)) + info_ptr->bit_depth = 8; +#else + /* Force chopping 16-bit input down to 8 */ + if (info_ptr->bit_depth == 16) + { + png_ptr->transformations |=PNG_16_TO_8; + info_ptr->bit_depth = 8; + } +#endif +#endif + +#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED + if (png_ptr->transformations & PNG_GRAY_TO_RGB) + info_ptr->color_type |= PNG_COLOR_MASK_COLOR; +#endif + +#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED + if (png_ptr->transformations & PNG_RGB_TO_GRAY) + info_ptr->color_type &= ~PNG_COLOR_MASK_COLOR; +#endif + +#ifdef PNG_READ_QUANTIZE_SUPPORTED + if (png_ptr->transformations & PNG_QUANTIZE) + { + if (((info_ptr->color_type == PNG_COLOR_TYPE_RGB) || + (info_ptr->color_type == PNG_COLOR_TYPE_RGB_ALPHA)) && + png_ptr->palette_lookup && info_ptr->bit_depth == 8) + { + info_ptr->color_type = PNG_COLOR_TYPE_PALETTE; + } + } +#endif + +#ifdef PNG_READ_PACK_SUPPORTED + if ((png_ptr->transformations & PNG_PACK) && (info_ptr->bit_depth < 8)) + info_ptr->bit_depth = 8; +#endif + + if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) + info_ptr->channels = 1; + + else if (info_ptr->color_type & PNG_COLOR_MASK_COLOR) + info_ptr->channels = 3; + + else + info_ptr->channels = 1; + +#ifdef PNG_READ_STRIP_ALPHA_SUPPORTED + if (png_ptr->flags & PNG_FLAG_STRIP_ALPHA) + info_ptr->color_type &= ~PNG_COLOR_MASK_ALPHA; +#endif + + if (info_ptr->color_type & PNG_COLOR_MASK_ALPHA) + info_ptr->channels++; + +#ifdef PNG_READ_FILLER_SUPPORTED + /* STRIP_ALPHA and FILLER allowed: MASK_ALPHA bit stripped above */ + if ((png_ptr->transformations & PNG_FILLER) && + ((info_ptr->color_type == PNG_COLOR_TYPE_RGB) || + (info_ptr->color_type == PNG_COLOR_TYPE_GRAY))) + { + info_ptr->channels++; + /* If adding a true alpha channel not just filler */ + if (png_ptr->transformations & PNG_ADD_ALPHA) + info_ptr->color_type |= PNG_COLOR_MASK_ALPHA; + } +#endif + +#if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED) && \ +defined(PNG_READ_USER_TRANSFORM_SUPPORTED) + if (png_ptr->transformations & PNG_USER_TRANSFORM) + { + if (info_ptr->bit_depth < png_ptr->user_transform_depth) + info_ptr->bit_depth = png_ptr->user_transform_depth; + + if (info_ptr->channels < png_ptr->user_transform_channels) + info_ptr->channels = png_ptr->user_transform_channels; + } +#endif + + info_ptr->pixel_depth = (png_byte)(info_ptr->channels * + info_ptr->bit_depth); + + info_ptr->rowbytes = PNG_ROWBYTES(info_ptr->pixel_depth, info_ptr->width); + +#ifndef PNG_READ_EXPAND_SUPPORTED + if (png_ptr) + return; +#endif +} + +/* Transform the row. The order of transformations is significant, + * and is very touchy. If you add a transformation, take care to + * decide how it fits in with the other transformations here. + */ +void /* PRIVATE */ +png_do_read_transformations(png_structp png_ptr) +{ + png_debug(1, "in png_do_read_transformations"); + + if (png_ptr->row_buf == NULL) + { +#ifdef PNG_CONSOLE_IO_SUPPORTED + char msg[50]; + + png_snprintf2(msg, 50, + "NULL row buffer for row %ld, pass %d", (long)png_ptr->row_number, + png_ptr->pass); + png_error(png_ptr, msg); +#else + png_error(png_ptr, "NULL row buffer"); +#endif + } +#ifdef PNG_WARN_UNINITIALIZED_ROW + if (!(png_ptr->flags & PNG_FLAG_ROW_INIT)) + /* Application has failed to call either png_read_start_image() + * or png_read_update_info() after setting transforms that expand + * pixels. This check added to libpng-1.2.19 + */ +#if (PNG_WARN_UNINITIALIZED_ROW==1) + png_error(png_ptr, "Uninitialized row"); +#else + png_warning(png_ptr, "Uninitialized row"); +#endif +#endif + +#ifdef PNG_READ_EXPAND_SUPPORTED + if (png_ptr->transformations & PNG_EXPAND) + { + if (png_ptr->row_info.color_type == PNG_COLOR_TYPE_PALETTE) + { + png_do_expand_palette(&(png_ptr->row_info), png_ptr->row_buf + 1, + png_ptr->palette, png_ptr->trans_alpha, png_ptr->num_trans); + } + else + { + if (png_ptr->num_trans && + (png_ptr->transformations & PNG_EXPAND_tRNS)) + png_do_expand(&(png_ptr->row_info), png_ptr->row_buf + 1, + &(png_ptr->trans_color)); + else + + png_do_expand(&(png_ptr->row_info), png_ptr->row_buf + 1, + NULL); + } + } +#endif + +#ifdef PNG_READ_STRIP_ALPHA_SUPPORTED + if (png_ptr->flags & PNG_FLAG_STRIP_ALPHA) + png_do_strip_filler(&(png_ptr->row_info), png_ptr->row_buf + 1, + PNG_FLAG_FILLER_AFTER | (png_ptr->flags & PNG_FLAG_STRIP_ALPHA)); +#endif + +#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED + if (png_ptr->transformations & PNG_RGB_TO_GRAY) + { + int rgb_error = + png_do_rgb_to_gray(png_ptr, &(png_ptr->row_info), + png_ptr->row_buf + 1); + + if (rgb_error) + { + png_ptr->rgb_to_gray_status=1; + if ((png_ptr->transformations & PNG_RGB_TO_GRAY) == + PNG_RGB_TO_GRAY_WARN) + png_warning(png_ptr, "png_do_rgb_to_gray found nongray pixel"); + + if ((png_ptr->transformations & PNG_RGB_TO_GRAY) == + PNG_RGB_TO_GRAY_ERR) + png_error(png_ptr, "png_do_rgb_to_gray found nongray pixel"); + } + } +#endif + +/* From Andreas Dilger e-mail to png-implement, 26 March 1998: + * + * In most cases, the "simple transparency" should be done prior to doing + * gray-to-RGB, or you will have to test 3x as many bytes to check if a + * pixel is transparent. You would also need to make sure that the + * transparency information is upgraded to RGB. + * + * To summarize, the current flow is: + * - Gray + simple transparency -> compare 1 or 2 gray bytes and composite + * with background "in place" if transparent, + * convert to RGB if necessary + * - Gray + alpha -> composite with gray background and remove alpha bytes, + * convert to RGB if necessary + * + * To support RGB backgrounds for gray images we need: + * - Gray + simple transparency -> convert to RGB + simple transparency, + * compare 3 or 6 bytes and composite with + * background "in place" if transparent + * (3x compare/pixel compared to doing + * composite with gray bkgrnd) + * - Gray + alpha -> convert to RGB + alpha, composite with background and + * remove alpha bytes (3x float + * operations/pixel compared with composite + * on gray background) + * + * Greg's change will do this. The reason it wasn't done before is for + * performance, as this increases the per-pixel operations. If we would check + * in advance if the background was gray or RGB, and position the gray-to-RGB + * transform appropriately, then it would save a lot of work/time. + */ + +#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED + /* If gray -> RGB, do so now only if background is non-gray; else do later + * for performance reasons + */ + if ((png_ptr->transformations & PNG_GRAY_TO_RGB) && + !(png_ptr->mode & PNG_BACKGROUND_IS_GRAY)) + png_do_gray_to_rgb(&(png_ptr->row_info), png_ptr->row_buf + 1); +#endif + +#ifdef PNG_READ_BACKGROUND_SUPPORTED + if ((png_ptr->transformations & PNG_BACKGROUND) && + ((png_ptr->num_trans != 0) || + (png_ptr->color_type & PNG_COLOR_MASK_ALPHA))) + png_do_background(&(png_ptr->row_info), png_ptr->row_buf + 1, + &(png_ptr->trans_color), &(png_ptr->background) +#ifdef PNG_READ_GAMMA_SUPPORTED + , &(png_ptr->background_1), + png_ptr->gamma_table, png_ptr->gamma_from_1, + png_ptr->gamma_to_1, png_ptr->gamma_16_table, + png_ptr->gamma_16_from_1, png_ptr->gamma_16_to_1, + png_ptr->gamma_shift +#endif + ); +#endif + +#ifdef PNG_READ_GAMMA_SUPPORTED + if ((png_ptr->transformations & PNG_GAMMA) && +#ifdef PNG_READ_BACKGROUND_SUPPORTED + !((png_ptr->transformations & PNG_BACKGROUND) && + ((png_ptr->num_trans != 0) || + (png_ptr->color_type & PNG_COLOR_MASK_ALPHA))) && +#endif + (png_ptr->color_type != PNG_COLOR_TYPE_PALETTE)) + png_do_gamma(&(png_ptr->row_info), png_ptr->row_buf + 1, + png_ptr->gamma_table, png_ptr->gamma_16_table, + png_ptr->gamma_shift); +#endif + +#ifdef PNG_READ_16_TO_8_SUPPORTED + if (png_ptr->transformations & PNG_16_TO_8) + png_do_chop(&(png_ptr->row_info), png_ptr->row_buf + 1); +#endif + +#ifdef PNG_READ_QUANTIZE_SUPPORTED + if (png_ptr->transformations & PNG_QUANTIZE) + { + png_do_quantize(&(png_ptr->row_info), png_ptr->row_buf + 1, + png_ptr->palette_lookup, png_ptr->quantize_index); + + if (png_ptr->row_info.rowbytes == 0) + png_error(png_ptr, "png_do_quantize returned rowbytes=0"); + } +#endif /* PNG_READ_QUANTIZE_SUPPORTED */ + +#ifdef PNG_READ_INVERT_SUPPORTED + if (png_ptr->transformations & PNG_INVERT_MONO) + png_do_invert(&(png_ptr->row_info), png_ptr->row_buf + 1); +#endif + +#ifdef PNG_READ_SHIFT_SUPPORTED + if (png_ptr->transformations & PNG_SHIFT) + png_do_unshift(&(png_ptr->row_info), png_ptr->row_buf + 1, + &(png_ptr->shift)); +#endif + +#ifdef PNG_READ_PACK_SUPPORTED + if (png_ptr->transformations & PNG_PACK) + png_do_unpack(&(png_ptr->row_info), png_ptr->row_buf + 1); +#endif + +#ifdef PNG_READ_BGR_SUPPORTED + if (png_ptr->transformations & PNG_BGR) + png_do_bgr(&(png_ptr->row_info), png_ptr->row_buf + 1); +#endif + +#ifdef PNG_READ_PACKSWAP_SUPPORTED + if (png_ptr->transformations & PNG_PACKSWAP) + png_do_packswap(&(png_ptr->row_info), png_ptr->row_buf + 1); +#endif + +#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED + /* If gray -> RGB, do so now only if we did not do so above */ + if ((png_ptr->transformations & PNG_GRAY_TO_RGB) && + (png_ptr->mode & PNG_BACKGROUND_IS_GRAY)) + png_do_gray_to_rgb(&(png_ptr->row_info), png_ptr->row_buf + 1); +#endif + +#ifdef PNG_READ_FILLER_SUPPORTED + if (png_ptr->transformations & PNG_FILLER) + png_do_read_filler(&(png_ptr->row_info), png_ptr->row_buf + 1, + (png_uint_32)png_ptr->filler, png_ptr->flags); +#endif + +#ifdef PNG_READ_INVERT_ALPHA_SUPPORTED + if (png_ptr->transformations & PNG_INVERT_ALPHA) + png_do_read_invert_alpha(&(png_ptr->row_info), png_ptr->row_buf + 1); +#endif + +#ifdef PNG_READ_SWAP_ALPHA_SUPPORTED + if (png_ptr->transformations & PNG_SWAP_ALPHA) + png_do_read_swap_alpha(&(png_ptr->row_info), png_ptr->row_buf + 1); +#endif + +#ifdef PNG_READ_16BIT_SUPPORTED +#ifdef PNG_READ_SWAP_SUPPORTED + if (png_ptr->transformations & PNG_SWAP_BYTES) + png_do_swap(&(png_ptr->row_info), png_ptr->row_buf + 1); +#endif +#endif + +#ifdef PNG_READ_USER_TRANSFORM_SUPPORTED + if (png_ptr->transformations & PNG_USER_TRANSFORM) + { + if (png_ptr->read_user_transform_fn != NULL) + (*(png_ptr->read_user_transform_fn)) /* User read transform function */ + (png_ptr, /* png_ptr */ + &(png_ptr->row_info), /* row_info: */ + /* png_uint_32 width; width of row */ + /* png_size_t rowbytes; number of bytes in row */ + /* png_byte color_type; color type of pixels */ + /* png_byte bit_depth; bit depth of samples */ + /* png_byte channels; number of channels (1-4) */ + /* png_byte pixel_depth; bits per pixel (depth*channels) */ + png_ptr->row_buf + 1); /* start of pixel data for row */ +#ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED + if (png_ptr->user_transform_depth) + png_ptr->row_info.bit_depth = png_ptr->user_transform_depth; + + if (png_ptr->user_transform_channels) + png_ptr->row_info.channels = png_ptr->user_transform_channels; +#endif + png_ptr->row_info.pixel_depth = (png_byte)(png_ptr->row_info.bit_depth * + png_ptr->row_info.channels); + + png_ptr->row_info.rowbytes = PNG_ROWBYTES(png_ptr->row_info.pixel_depth, + png_ptr->row_info.width); + } +#endif + +} + +#ifdef PNG_READ_PACK_SUPPORTED +/* Unpack pixels of 1, 2, or 4 bits per pixel into 1 byte per pixel, + * without changing the actual values. Thus, if you had a row with + * a bit depth of 1, you would end up with bytes that only contained + * the numbers 0 or 1. If you would rather they contain 0 and 255, use + * png_do_shift() after this. + */ +void /* PRIVATE */ +png_do_unpack(png_row_infop row_info, png_bytep row) +{ + png_debug(1, "in png_do_unpack"); + + if (row_info->bit_depth < 8) + { + png_uint_32 i; + png_uint_32 row_width=row_info->width; + + switch (row_info->bit_depth) + { + case 1: + { + png_bytep sp = row + (png_size_t)((row_width - 1) >> 3); + png_bytep dp = row + (png_size_t)row_width - 1; + png_uint_32 shift = 7 - (int)((row_width + 7) & 0x07); + for (i = 0; i < row_width; i++) + { + *dp = (png_byte)((*sp >> shift) & 0x01); + + if (shift == 7) + { + shift = 0; + sp--; + } + + else + shift++; + + dp--; + } + break; + } + + case 2: + { + + png_bytep sp = row + (png_size_t)((row_width - 1) >> 2); + png_bytep dp = row + (png_size_t)row_width - 1; + png_uint_32 shift = (int)((3 - ((row_width + 3) & 0x03)) << 1); + for (i = 0; i < row_width; i++) + { + *dp = (png_byte)((*sp >> shift) & 0x03); + + if (shift == 6) + { + shift = 0; + sp--; + } + + else + shift += 2; + + dp--; + } + break; + } + + case 4: + { + png_bytep sp = row + (png_size_t)((row_width - 1) >> 1); + png_bytep dp = row + (png_size_t)row_width - 1; + png_uint_32 shift = (int)((1 - ((row_width + 1) & 0x01)) << 2); + for (i = 0; i < row_width; i++) + { + *dp = (png_byte)((*sp >> shift) & 0x0f); + + if (shift == 4) + { + shift = 0; + sp--; + } + + else + shift = 4; + + dp--; + } + break; + } + + default: + break; + } + row_info->bit_depth = 8; + row_info->pixel_depth = (png_byte)(8 * row_info->channels); + row_info->rowbytes = row_width * row_info->channels; + } +} +#endif + +#ifdef PNG_READ_SHIFT_SUPPORTED +/* Reverse the effects of png_do_shift. This routine merely shifts the + * pixels back to their significant bits values. Thus, if you have + * a row of bit depth 8, but only 5 are significant, this will shift + * the values back to 0 through 31. + */ +void /* PRIVATE */ +png_do_unshift(png_row_infop row_info, png_bytep row, + png_const_color_8p sig_bits) +{ + png_debug(1, "in png_do_unshift"); + + if ( + row_info->color_type != PNG_COLOR_TYPE_PALETTE) + { + int shift[4]; + int channels = 0; + int c; + png_uint_16 value = 0; + png_uint_32 row_width = row_info->width; + + if (row_info->color_type & PNG_COLOR_MASK_COLOR) + { + shift[channels++] = row_info->bit_depth - sig_bits->red; + shift[channels++] = row_info->bit_depth - sig_bits->green; + shift[channels++] = row_info->bit_depth - sig_bits->blue; + } + + else + { + shift[channels++] = row_info->bit_depth - sig_bits->gray; + } + + if (row_info->color_type & PNG_COLOR_MASK_ALPHA) + { + shift[channels++] = row_info->bit_depth - sig_bits->alpha; + } + + for (c = 0; c < channels; c++) + { + if (shift[c] <= 0) + shift[c] = 0; + + else + value = 1; + } + + if (!value) + return; + + switch (row_info->bit_depth) + { + default: + break; + + case 2: + { + png_bytep bp; + png_size_t i; + png_size_t istop = row_info->rowbytes; + + for (bp = row, i = 0; i < istop; i++) + { + *bp >>= 1; + *bp++ &= 0x55; + } + break; + } + + case 4: + { + png_bytep bp = row; + png_size_t i; + png_size_t istop = row_info->rowbytes; + png_byte mask = (png_byte)((((int)0xf0 >> shift[0]) & (int)0xf0) | + (png_byte)((int)0xf >> shift[0])); + + for (i = 0; i < istop; i++) + { + *bp >>= shift[0]; + *bp++ &= mask; + } + break; + } + + case 8: + { + png_bytep bp = row; + png_uint_32 i; + png_uint_32 istop = row_width * channels; + + for (i = 0; i < istop; i++) + { + *bp++ >>= shift[i%channels]; + } + break; + } + +#ifdef PNG_READ_16BIT_SUPPORTED + case 16: + { + png_bytep bp = row; + png_uint_32 i; + png_uint_32 istop = channels * row_width; + + for (i = 0; i < istop; i++) + { + value = (png_uint_16)((*bp << 8) + *(bp + 1)); + value >>= shift[i%channels]; + *bp++ = (png_byte)(value >> 8); + *bp++ = (png_byte)(value & 0xff); + } + break; + } +#endif + } + } +} +#endif + +#ifdef PNG_READ_16_TO_8_SUPPORTED +/* Chop rows of bit depth 16 down to 8 */ +void /* PRIVATE */ +png_do_chop(png_row_infop row_info, png_bytep row) +{ + png_debug(1, "in png_do_chop"); + + if (row_info->bit_depth == 16) + { + png_bytep sp = row; + png_bytep dp = row; + png_uint_32 i; + png_uint_32 istop = row_info->width * row_info->channels; + + for (i = 0; i> 8)) >> 8; + * + * Approximate calculation with shift/add instead of multiply/divide: + * *dp = ((((png_uint_32)(*sp) << 8) | + * (png_uint_32)((int)(*(sp + 1)) - *sp)) + 128) >> 8; + * + * What we actually do to avoid extra shifting and conversion: + */ + + *dp = *sp + ((((int)(*(sp + 1)) - *sp) > 128) ? 1 : 0); +#else + /* Simply discard the low order byte */ + *dp = *sp; +#endif + } + row_info->bit_depth = 8; + row_info->pixel_depth = (png_byte)(8 * row_info->channels); + row_info->rowbytes = row_info->width * row_info->channels; + } +} +#endif + +#ifdef PNG_READ_SWAP_ALPHA_SUPPORTED +void /* PRIVATE */ +png_do_read_swap_alpha(png_row_infop row_info, png_bytep row) +{ + png_debug(1, "in png_do_read_swap_alpha"); + + { + png_uint_32 row_width = row_info->width; + if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) + { + /* This converts from RGBA to ARGB */ + if (row_info->bit_depth == 8) + { + png_bytep sp = row + row_info->rowbytes; + png_bytep dp = sp; + png_byte save; + png_uint_32 i; + + for (i = 0; i < row_width; i++) + { + save = *(--sp); + *(--dp) = *(--sp); + *(--dp) = *(--sp); + *(--dp) = *(--sp); + *(--dp) = save; + } + } + +#ifdef PNG_READ_16BIT_SUPPORTED + /* This converts from RRGGBBAA to AARRGGBB */ + else + { + png_bytep sp = row + row_info->rowbytes; + png_bytep dp = sp; + png_byte save[2]; + png_uint_32 i; + + for (i = 0; i < row_width; i++) + { + save[0] = *(--sp); + save[1] = *(--sp); + *(--dp) = *(--sp); + *(--dp) = *(--sp); + *(--dp) = *(--sp); + *(--dp) = *(--sp); + *(--dp) = *(--sp); + *(--dp) = *(--sp); + *(--dp) = save[0]; + *(--dp) = save[1]; + } + } +#endif + } + + else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) + { + /* This converts from GA to AG */ + if (row_info->bit_depth == 8) + { + png_bytep sp = row + row_info->rowbytes; + png_bytep dp = sp; + png_byte save; + png_uint_32 i; + + for (i = 0; i < row_width; i++) + { + save = *(--sp); + *(--dp) = *(--sp); + *(--dp) = save; + } + } + +#ifdef PNG_READ_16BIT_SUPPORTED + /* This converts from GGAA to AAGG */ + else + { + png_bytep sp = row + row_info->rowbytes; + png_bytep dp = sp; + png_byte save[2]; + png_uint_32 i; + + for (i = 0; i < row_width; i++) + { + save[0] = *(--sp); + save[1] = *(--sp); + *(--dp) = *(--sp); + *(--dp) = *(--sp); + *(--dp) = save[0]; + *(--dp) = save[1]; + } + } +#endif + } + } +} +#endif + +#ifdef PNG_READ_INVERT_ALPHA_SUPPORTED +void /* PRIVATE */ +png_do_read_invert_alpha(png_row_infop row_info, png_bytep row) +{ + png_uint_32 row_width; + png_debug(1, "in png_do_read_invert_alpha"); + + row_width = row_info->width; + if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) + { + if (row_info->bit_depth == 8) + { + /* This inverts the alpha channel in RGBA */ + png_bytep sp = row + row_info->rowbytes; + png_bytep dp = sp; + png_uint_32 i; + + for (i = 0; i < row_width; i++) + { + *(--dp) = (png_byte)(255 - *(--sp)); + +/* This does nothing: + *(--dp) = *(--sp); + *(--dp) = *(--sp); + *(--dp) = *(--sp); + We can replace it with: +*/ + sp-=3; + dp=sp; + } + } + +#ifdef PNG_READ_16BIT_SUPPORTED + /* This inverts the alpha channel in RRGGBBAA */ + else + { + png_bytep sp = row + row_info->rowbytes; + png_bytep dp = sp; + png_uint_32 i; + + for (i = 0; i < row_width; i++) + { + *(--dp) = (png_byte)(255 - *(--sp)); + *(--dp) = (png_byte)(255 - *(--sp)); + +/* This does nothing: + *(--dp) = *(--sp); + *(--dp) = *(--sp); + *(--dp) = *(--sp); + *(--dp) = *(--sp); + *(--dp) = *(--sp); + *(--dp) = *(--sp); + We can replace it with: +*/ + sp-=6; + dp=sp; + } + } +#endif + } + else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) + { + if (row_info->bit_depth == 8) + { + /* This inverts the alpha channel in GA */ + png_bytep sp = row + row_info->rowbytes; + png_bytep dp = sp; + png_uint_32 i; + + for (i = 0; i < row_width; i++) + { + *(--dp) = (png_byte)(255 - *(--sp)); + *(--dp) = *(--sp); + } + } + +#ifdef PNG_READ_16BIT_SUPPORTED + else + { + /* This inverts the alpha channel in GGAA */ + png_bytep sp = row + row_info->rowbytes; + png_bytep dp = sp; + png_uint_32 i; + + for (i = 0; i < row_width; i++) + { + *(--dp) = (png_byte)(255 - *(--sp)); + *(--dp) = (png_byte)(255 - *(--sp)); +/* + *(--dp) = *(--sp); + *(--dp) = *(--sp); +*/ + sp-=2; + dp=sp; + } + } +#endif + } +} +#endif + +#ifdef PNG_READ_FILLER_SUPPORTED +/* Add filler channel if we have RGB color */ +void /* PRIVATE */ +png_do_read_filler(png_row_infop row_info, png_bytep row, + png_uint_32 filler, png_uint_32 flags) +{ + png_uint_32 i; + png_uint_32 row_width = row_info->width; + +#ifdef PNG_READ_16BIT_SUPPORTED + png_byte hi_filler = (png_byte)((filler>>8) & 0xff); +#endif + png_byte lo_filler = (png_byte)(filler & 0xff); + + png_debug(1, "in png_do_read_filler"); + + if ( + row_info->color_type == PNG_COLOR_TYPE_GRAY) + { + if (row_info->bit_depth == 8) + { + if (flags & PNG_FLAG_FILLER_AFTER) + { + /* This changes the data from G to GX */ + png_bytep sp = row + (png_size_t)row_width; + png_bytep dp = sp + (png_size_t)row_width; + for (i = 1; i < row_width; i++) + { + *(--dp) = lo_filler; + *(--dp) = *(--sp); + } + *(--dp) = lo_filler; + row_info->channels = 2; + row_info->pixel_depth = 16; + row_info->rowbytes = row_width * 2; + } + + else + { + /* This changes the data from G to XG */ + png_bytep sp = row + (png_size_t)row_width; + png_bytep dp = sp + (png_size_t)row_width; + for (i = 0; i < row_width; i++) + { + *(--dp) = *(--sp); + *(--dp) = lo_filler; + } + row_info->channels = 2; + row_info->pixel_depth = 16; + row_info->rowbytes = row_width * 2; + } + } + +#ifdef PNG_READ_16BIT_SUPPORTED + else if (row_info->bit_depth == 16) + { + if (flags & PNG_FLAG_FILLER_AFTER) + { + /* This changes the data from GG to GGXX */ + png_bytep sp = row + (png_size_t)row_width * 2; + png_bytep dp = sp + (png_size_t)row_width * 2; + for (i = 1; i < row_width; i++) + { + *(--dp) = hi_filler; + *(--dp) = lo_filler; + *(--dp) = *(--sp); + *(--dp) = *(--sp); + } + *(--dp) = hi_filler; + *(--dp) = lo_filler; + row_info->channels = 2; + row_info->pixel_depth = 32; + row_info->rowbytes = row_width * 4; + } + + else + { + /* This changes the data from GG to XXGG */ + png_bytep sp = row + (png_size_t)row_width * 2; + png_bytep dp = sp + (png_size_t)row_width * 2; + for (i = 0; i < row_width; i++) + { + *(--dp) = *(--sp); + *(--dp) = *(--sp); + *(--dp) = hi_filler; + *(--dp) = lo_filler; + } + row_info->channels = 2; + row_info->pixel_depth = 32; + row_info->rowbytes = row_width * 4; + } + } +#endif + } /* COLOR_TYPE == GRAY */ + else if (row_info->color_type == PNG_COLOR_TYPE_RGB) + { + if (row_info->bit_depth == 8) + { + if (flags & PNG_FLAG_FILLER_AFTER) + { + /* This changes the data from RGB to RGBX */ + png_bytep sp = row + (png_size_t)row_width * 3; + png_bytep dp = sp + (png_size_t)row_width; + for (i = 1; i < row_width; i++) + { + *(--dp) = lo_filler; + *(--dp) = *(--sp); + *(--dp) = *(--sp); + *(--dp) = *(--sp); + } + *(--dp) = lo_filler; + row_info->channels = 4; + row_info->pixel_depth = 32; + row_info->rowbytes = row_width * 4; + } + + else + { + /* This changes the data from RGB to XRGB */ + png_bytep sp = row + (png_size_t)row_width * 3; + png_bytep dp = sp + (png_size_t)row_width; + for (i = 0; i < row_width; i++) + { + *(--dp) = *(--sp); + *(--dp) = *(--sp); + *(--dp) = *(--sp); + *(--dp) = lo_filler; + } + row_info->channels = 4; + row_info->pixel_depth = 32; + row_info->rowbytes = row_width * 4; + } + } + +#ifdef PNG_READ_16BIT_SUPPORTED + else if (row_info->bit_depth == 16) + { + if (flags & PNG_FLAG_FILLER_AFTER) + { + /* This changes the data from RRGGBB to RRGGBBXX */ + png_bytep sp = row + (png_size_t)row_width * 6; + png_bytep dp = sp + (png_size_t)row_width * 2; + for (i = 1; i < row_width; i++) + { + *(--dp) = hi_filler; + *(--dp) = lo_filler; + *(--dp) = *(--sp); + *(--dp) = *(--sp); + *(--dp) = *(--sp); + *(--dp) = *(--sp); + *(--dp) = *(--sp); + *(--dp) = *(--sp); + } + *(--dp) = hi_filler; + *(--dp) = lo_filler; + row_info->channels = 4; + row_info->pixel_depth = 64; + row_info->rowbytes = row_width * 8; + } + + else + { + /* This changes the data from RRGGBB to XXRRGGBB */ + png_bytep sp = row + (png_size_t)row_width * 6; + png_bytep dp = sp + (png_size_t)row_width * 2; + for (i = 0; i < row_width; i++) + { + *(--dp) = *(--sp); + *(--dp) = *(--sp); + *(--dp) = *(--sp); + *(--dp) = *(--sp); + *(--dp) = *(--sp); + *(--dp) = *(--sp); + *(--dp) = hi_filler; + *(--dp) = lo_filler; + } + + row_info->channels = 4; + row_info->pixel_depth = 64; + row_info->rowbytes = row_width * 8; + } + } +#endif + } /* COLOR_TYPE == RGB */ +} +#endif + +#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED +/* Expand grayscale files to RGB, with or without alpha */ +void /* PRIVATE */ +png_do_gray_to_rgb(png_row_infop row_info, png_bytep row) +{ + png_uint_32 i; + png_uint_32 row_width = row_info->width; + + png_debug(1, "in png_do_gray_to_rgb"); + + if (row_info->bit_depth >= 8 && + !(row_info->color_type & PNG_COLOR_MASK_COLOR)) + { + if (row_info->color_type == PNG_COLOR_TYPE_GRAY) + { + if (row_info->bit_depth == 8) + { + /* This changes G to RGB */ + png_bytep sp = row + (png_size_t)row_width - 1; + png_bytep dp = sp + (png_size_t)row_width * 2; + for (i = 0; i < row_width; i++) + { + *(dp--) = *sp; + *(dp--) = *sp; + *(dp--) = *(sp--); + } + } + + else + { + /* This changes GG to RRGGBB */ + png_bytep sp = row + (png_size_t)row_width * 2 - 1; + png_bytep dp = sp + (png_size_t)row_width * 4; + for (i = 0; i < row_width; i++) + { + *(dp--) = *sp; + *(dp--) = *(sp - 1); + *(dp--) = *sp; + *(dp--) = *(sp - 1); + *(dp--) = *(sp--); + *(dp--) = *(sp--); + } + } + } + + else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) + { + if (row_info->bit_depth == 8) + { + /* This changes GA to RGBA */ + png_bytep sp = row + (png_size_t)row_width * 2 - 1; + png_bytep dp = sp + (png_size_t)row_width * 2; + for (i = 0; i < row_width; i++) + { + *(dp--) = *(sp--); + *(dp--) = *sp; + *(dp--) = *sp; + *(dp--) = *(sp--); + } + } + + else + { + /* This changes GGAA to RRGGBBAA */ + png_bytep sp = row + (png_size_t)row_width * 4 - 1; + png_bytep dp = sp + (png_size_t)row_width * 4; + for (i = 0; i < row_width; i++) + { + *(dp--) = *(sp--); + *(dp--) = *(sp--); + *(dp--) = *sp; + *(dp--) = *(sp - 1); + *(dp--) = *sp; + *(dp--) = *(sp - 1); + *(dp--) = *(sp--); + *(dp--) = *(sp--); + } + } + } + row_info->channels += (png_byte)2; + row_info->color_type |= PNG_COLOR_MASK_COLOR; + row_info->pixel_depth = (png_byte)(row_info->channels * + row_info->bit_depth); + row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, row_width); + } +} +#endif + +#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED +/* Reduce RGB files to grayscale, with or without alpha + * using the equation given in Poynton's ColorFAQ at + * (THIS LINK IS DEAD June 2008) + * New link: + * + * Charles Poynton poynton at poynton.com + * + * Y = 0.212671 * R + 0.715160 * G + 0.072169 * B + * + * We approximate this with + * + * Y = 0.21268 * R + 0.7151 * G + 0.07217 * B + * + * which can be expressed with integers as + * + * Y = (6969 * R + 23434 * G + 2365 * B)/32768 + * + * The calculation is to be done in a linear colorspace. + * + * Other integer coefficents can be used via png_set_rgb_to_gray(). + */ +int /* PRIVATE */ +png_do_rgb_to_gray(png_structp png_ptr, png_row_infop row_info, png_bytep row) + +{ + png_uint_32 i; + + png_uint_32 row_width = row_info->width; + int rgb_error = 0; + + png_debug(1, "in png_do_rgb_to_gray"); + + if (!(row_info->color_type & PNG_COLOR_MASK_PALETTE) && + (row_info->color_type & PNG_COLOR_MASK_COLOR)) + { + png_uint_32 rc = png_ptr->rgb_to_gray_red_coeff; + png_uint_32 gc = png_ptr->rgb_to_gray_green_coeff; + png_uint_32 bc = png_ptr->rgb_to_gray_blue_coeff; + + if (row_info->color_type == PNG_COLOR_TYPE_RGB) + { + if (row_info->bit_depth == 8) + { +#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) + if (png_ptr->gamma_from_1 != NULL && png_ptr->gamma_to_1 != NULL) + { + png_bytep sp = row; + png_bytep dp = row; + + for (i = 0; i < row_width; i++) + { + png_byte red = png_ptr->gamma_to_1[*(sp++)]; + png_byte green = png_ptr->gamma_to_1[*(sp++)]; + png_byte blue = png_ptr->gamma_to_1[*(sp++)]; + + if (red != green || red != blue) + { + rgb_error |= 1; + *(dp++) = png_ptr->gamma_from_1[ + (rc*red + gc*green + bc*blue)>>15]; + } + + else + *(dp++) = *(sp - 1); + } + } + else +#endif + { + png_bytep sp = row; + png_bytep dp = row; + for (i = 0; i < row_width; i++) + { + png_byte red = *(sp++); + png_byte green = *(sp++); + png_byte blue = *(sp++); + + if (red != green || red != blue) + { + rgb_error |= 1; + *(dp++) = (png_byte)((rc*red + gc*green + bc*blue)>>15); + } + + else + *(dp++) = *(sp - 1); + } + } + } + + else /* RGB bit_depth == 16 */ + { +#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) + if (png_ptr->gamma_16_to_1 != NULL && + png_ptr->gamma_16_from_1 != NULL) + { + png_bytep sp = row; + png_bytep dp = row; + for (i = 0; i < row_width; i++) + { + png_uint_16 red, green, blue, w; + + red = (png_uint_16)(((*(sp))<<8) | *(sp + 1)); sp += 2; + green = (png_uint_16)(((*(sp))<<8) | *(sp + 1)); sp += 2; + blue = (png_uint_16)(((*(sp))<<8) | *(sp + 1)); sp += 2; + + if (red == green && red == blue) + w = red; + + else + { + png_uint_16 red_1 = png_ptr->gamma_16_to_1[(red&0xff) + >> png_ptr->gamma_shift][red>>8]; + png_uint_16 green_1 = + png_ptr->gamma_16_to_1[(green&0xff) >> + png_ptr->gamma_shift][green>>8]; + png_uint_16 blue_1 = png_ptr->gamma_16_to_1[(blue&0xff) + >> png_ptr->gamma_shift][blue>>8]; + png_uint_16 gray16 = (png_uint_16)((rc*red_1 + gc*green_1 + + bc*blue_1)>>15); + w = png_ptr->gamma_16_from_1[(gray16&0xff) >> + png_ptr->gamma_shift][gray16 >> 8]; + rgb_error |= 1; + } + + *(dp++) = (png_byte)((w>>8) & 0xff); + *(dp++) = (png_byte)(w & 0xff); + } + } + else +#endif + { + png_bytep sp = row; + png_bytep dp = row; + for (i = 0; i < row_width; i++) + { + png_uint_16 red, green, blue, gray16; + + red = (png_uint_16)(((*(sp))<<8) | *(sp + 1)); sp += 2; + green = (png_uint_16)(((*(sp))<<8) | *(sp + 1)); sp += 2; + blue = (png_uint_16)(((*(sp))<<8) | *(sp + 1)); sp += 2; + + if (red != green || red != blue) + rgb_error |= 1; + + gray16 = (png_uint_16)((rc*red + gc*green + bc*blue)>>15); + *(dp++) = (png_byte)((gray16>>8) & 0xff); + *(dp++) = (png_byte)(gray16 & 0xff); + } + } + } + } + if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) + { + if (row_info->bit_depth == 8) + { +#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) + if (png_ptr->gamma_from_1 != NULL && png_ptr->gamma_to_1 != NULL) + { + png_bytep sp = row; + png_bytep dp = row; + for (i = 0; i < row_width; i++) + { + png_byte red = png_ptr->gamma_to_1[*(sp++)]; + png_byte green = png_ptr->gamma_to_1[*(sp++)]; + png_byte blue = png_ptr->gamma_to_1[*(sp++)]; + + if (red != green || red != blue) + rgb_error |= 1; + + *(dp++) = png_ptr->gamma_from_1 + [(rc*red + gc*green + bc*blue)>>15]; + + *(dp++) = *(sp++); /* alpha */ + } + } + else +#endif + { + png_bytep sp = row; + png_bytep dp = row; + for (i = 0; i < row_width; i++) + { + png_byte red = *(sp++); + png_byte green = *(sp++); + png_byte blue = *(sp++); + if (red != green || red != blue) + rgb_error |= 1; + + *(dp++) = (png_byte)((rc*red + gc*green + bc*blue)>>15); + *(dp++) = *(sp++); /* alpha */ + } + } + } + else /* RGBA bit_depth == 16 */ + { +#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) + if (png_ptr->gamma_16_to_1 != NULL && + png_ptr->gamma_16_from_1 != NULL) + { + png_bytep sp = row; + png_bytep dp = row; + for (i = 0; i < row_width; i++) + { + png_uint_16 red, green, blue, w; + + red = (png_uint_16)(((*(sp))<<8) | *(sp + 1)); sp += 2; + green = (png_uint_16)(((*(sp))<<8) | *(sp + 1)); sp += 2; + blue = (png_uint_16)(((*(sp))<<8) | *(sp + 1)); sp += 2; + + if (red == green && red == blue) + w = red; + + else + { + png_uint_16 red_1 = png_ptr->gamma_16_to_1[(red&0xff) >> + png_ptr->gamma_shift][red>>8]; + + png_uint_16 green_1 = + png_ptr->gamma_16_to_1[(green&0xff) >> + png_ptr->gamma_shift][green>>8]; + + png_uint_16 blue_1 = png_ptr->gamma_16_to_1[(blue&0xff) >> + png_ptr->gamma_shift][blue>>8]; + + png_uint_16 gray16 = (png_uint_16)((rc * red_1 + + gc * green_1 + bc * blue_1)>>15); + + w = png_ptr->gamma_16_from_1[(gray16&0xff) >> + png_ptr->gamma_shift][gray16 >> 8]; + + rgb_error |= 1; + } + + *(dp++) = (png_byte)((w>>8) & 0xff); + *(dp++) = (png_byte)(w & 0xff); + *(dp++) = *(sp++); /* alpha */ + *(dp++) = *(sp++); + } + } + else +#endif + { + png_bytep sp = row; + png_bytep dp = row; + for (i = 0; i < row_width; i++) + { + png_uint_16 red, green, blue, gray16; + red = (png_uint_16)((*(sp)<<8) | *(sp + 1)); sp += 2; + green = (png_uint_16)((*(sp)<<8) | *(sp + 1)); sp += 2; + blue = (png_uint_16)((*(sp)<<8) | *(sp + 1)); sp += 2; + + if (red != green || red != blue) + rgb_error |= 1; + + gray16 = (png_uint_16)((rc*red + gc*green + bc*blue)>>15); + *(dp++) = (png_byte)((gray16>>8) & 0xff); + *(dp++) = (png_byte)(gray16 & 0xff); + *(dp++) = *(sp++); /* alpha */ + *(dp++) = *(sp++); + } + } + } + } + row_info->channels -= 2; + row_info->color_type = (png_byte)(row_info->color_type & + ~PNG_COLOR_MASK_COLOR); + row_info->pixel_depth = (png_byte)(row_info->channels * + row_info->bit_depth); + row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, row_width); + } + return rgb_error; +} +#endif + +/* Build a grayscale palette. Palette is assumed to be 1 << bit_depth + * large of png_color. This lets grayscale images be treated as + * paletted. Most useful for gamma correction and simplification + * of code. + */ +void PNGAPI +png_build_grayscale_palette(int bit_depth, png_colorp palette) +{ + int num_palette; + int color_inc; + int i; + int v; + + png_debug(1, "in png_do_build_grayscale_palette"); + + if (palette == NULL) + return; + + switch (bit_depth) + { + case 1: + num_palette = 2; + color_inc = 0xff; + break; + + case 2: + num_palette = 4; + color_inc = 0x55; + break; + + case 4: + num_palette = 16; + color_inc = 0x11; + break; + + case 8: + num_palette = 256; + color_inc = 1; + break; + + default: + num_palette = 0; + color_inc = 0; + break; + } + + for (i = 0, v = 0; i < num_palette; i++, v += color_inc) + { + palette[i].red = (png_byte)v; + palette[i].green = (png_byte)v; + palette[i].blue = (png_byte)v; + } +} + + +#ifdef PNG_READ_BACKGROUND_SUPPORTED +/* Replace any alpha or transparency with the supplied background color. + * "background" is already in the screen gamma, while "background_1" is + * at a gamma of 1.0. Paletted files have already been taken care of. + */ +void /* PRIVATE */ +png_do_background(png_row_infop row_info, png_bytep row, + png_const_color_16p trans_color, png_const_color_16p background +#ifdef PNG_READ_GAMMA_SUPPORTED + , png_const_color_16p background_1, png_const_bytep gamma_table, + png_const_bytep gamma_from_1, png_const_bytep gamma_to_1, + png_const_uint_16pp gamma_16, png_const_uint_16pp gamma_16_from_1, + png_const_uint_16pp gamma_16_to_1, int gamma_shift +#endif + ) +{ + png_bytep sp, dp; + png_uint_32 i; + png_uint_32 row_width = row_info->width; + int shift; + + png_debug(1, "in png_do_background"); + + if (background != NULL && + (!(row_info->color_type & PNG_COLOR_MASK_ALPHA) || + (row_info->color_type != PNG_COLOR_TYPE_PALETTE && trans_color))) + { + switch (row_info->color_type) + { + case PNG_COLOR_TYPE_GRAY: + { + switch (row_info->bit_depth) + { + case 1: + { + sp = row; + shift = 7; + for (i = 0; i < row_width; i++) + { + if ((png_uint_16)((*sp >> shift) & 0x01) + == trans_color->gray) + { + *sp &= (png_byte)((0x7f7f >> (7 - shift)) & 0xff); + *sp |= (png_byte)(background->gray << shift); + } + + if (!shift) + { + shift = 7; + sp++; + } + + else + shift--; + } + break; + } + + case 2: + { +#ifdef PNG_READ_GAMMA_SUPPORTED + if (gamma_table != NULL) + { + sp = row; + shift = 6; + for (i = 0; i < row_width; i++) + { + if ((png_uint_16)((*sp >> shift) & 0x03) + == trans_color->gray) + { + *sp &= (png_byte)((0x3f3f >> (6 - shift)) & 0xff); + *sp |= (png_byte)(background->gray << shift); + } + + else + { + png_byte p = (png_byte)((*sp >> shift) & 0x03); + png_byte g = (png_byte)((gamma_table [p | (p << 2) | + (p << 4) | (p << 6)] >> 6) & 0x03); + *sp &= (png_byte)((0x3f3f >> (6 - shift)) & 0xff); + *sp |= (png_byte)(g << shift); + } + + if (!shift) + { + shift = 6; + sp++; + } + + else + shift -= 2; + } + } + + else +#endif + { + sp = row; + shift = 6; + for (i = 0; i < row_width; i++) + { + if ((png_uint_16)((*sp >> shift) & 0x03) + == trans_color->gray) + { + *sp &= (png_byte)((0x3f3f >> (6 - shift)) & 0xff); + *sp |= (png_byte)(background->gray << shift); + } + + if (!shift) + { + shift = 6; + sp++; + } + + else + shift -= 2; + } + } + break; + } + + case 4: + { +#ifdef PNG_READ_GAMMA_SUPPORTED + if (gamma_table != NULL) + { + sp = row; + shift = 4; + for (i = 0; i < row_width; i++) + { + if ((png_uint_16)((*sp >> shift) & 0x0f) + == trans_color->gray) + { + *sp &= (png_byte)((0xf0f >> (4 - shift)) & 0xff); + *sp |= (png_byte)(background->gray << shift); + } + + else + { + png_byte p = (png_byte)((*sp >> shift) & 0x0f); + png_byte g = (png_byte)((gamma_table[p | + (p << 4)] >> 4) & 0x0f); + *sp &= (png_byte)((0xf0f >> (4 - shift)) & 0xff); + *sp |= (png_byte)(g << shift); + } + + if (!shift) + { + shift = 4; + sp++; + } + + else + shift -= 4; + } + } + + else +#endif + { + sp = row; + shift = 4; + for (i = 0; i < row_width; i++) + { + if ((png_uint_16)((*sp >> shift) & 0x0f) + == trans_color->gray) + { + *sp &= (png_byte)((0xf0f >> (4 - shift)) & 0xff); + *sp |= (png_byte)(background->gray << shift); + } + + if (!shift) + { + shift = 4; + sp++; + } + + else + shift -= 4; + } + } + break; + } + + case 8: + { +#ifdef PNG_READ_GAMMA_SUPPORTED + if (gamma_table != NULL) + { + sp = row; + for (i = 0; i < row_width; i++, sp++) + { + if (*sp == trans_color->gray) + *sp = (png_byte)background->gray; + + else + *sp = gamma_table[*sp]; + } + } + else +#endif + { + sp = row; + for (i = 0; i < row_width; i++, sp++) + { + if (*sp == trans_color->gray) + *sp = (png_byte)background->gray; + } + } + break; + } + + case 16: + { +#ifdef PNG_READ_GAMMA_SUPPORTED + if (gamma_16 != NULL) + { + sp = row; + for (i = 0; i < row_width; i++, sp += 2) + { + png_uint_16 v; + + v = (png_uint_16)(((*sp) << 8) + *(sp + 1)); + + if (v == trans_color->gray) + { + /* Background is already in screen gamma */ + *sp = (png_byte)((background->gray >> 8) & 0xff); + *(sp + 1) = (png_byte)(background->gray & 0xff); + } + + else + { + v = gamma_16[*(sp + 1) >> gamma_shift][*sp]; + *sp = (png_byte)((v >> 8) & 0xff); + *(sp + 1) = (png_byte)(v & 0xff); + } + } + } + else +#endif + { + sp = row; + for (i = 0; i < row_width; i++, sp += 2) + { + png_uint_16 v; + + v = (png_uint_16)(((*sp) << 8) + *(sp + 1)); + + if (v == trans_color->gray) + { + *sp = (png_byte)((background->gray >> 8) & 0xff); + *(sp + 1) = (png_byte)(background->gray & 0xff); + } + } + } + break; + } + + default: + break; + } + break; + } + + case PNG_COLOR_TYPE_RGB: + { + if (row_info->bit_depth == 8) + { +#ifdef PNG_READ_GAMMA_SUPPORTED + if (gamma_table != NULL) + { + sp = row; + for (i = 0; i < row_width; i++, sp += 3) + { + if (*sp == trans_color->red && + *(sp + 1) == trans_color->green && + *(sp + 2) == trans_color->blue) + { + *sp = (png_byte)background->red; + *(sp + 1) = (png_byte)background->green; + *(sp + 2) = (png_byte)background->blue; + } + + else + { + *sp = gamma_table[*sp]; + *(sp + 1) = gamma_table[*(sp + 1)]; + *(sp + 2) = gamma_table[*(sp + 2)]; + } + } + } + else +#endif + { + sp = row; + for (i = 0; i < row_width; i++, sp += 3) + { + if (*sp == trans_color->red && + *(sp + 1) == trans_color->green && + *(sp + 2) == trans_color->blue) + { + *sp = (png_byte)background->red; + *(sp + 1) = (png_byte)background->green; + *(sp + 2) = (png_byte)background->blue; + } + } + } + } + else /* if (row_info->bit_depth == 16) */ + { +#ifdef PNG_READ_GAMMA_SUPPORTED + if (gamma_16 != NULL) + { + sp = row; + for (i = 0; i < row_width; i++, sp += 6) + { + png_uint_16 r = (png_uint_16)(((*sp) << 8) + *(sp + 1)); + + png_uint_16 g = (png_uint_16)(((*(sp + 2)) << 8) + + *(sp + 3)); + + png_uint_16 b = (png_uint_16)(((*(sp + 4)) << 8) + + *(sp + 5)); + + if (r == trans_color->red && g == trans_color->green && + b == trans_color->blue) + { + /* Background is already in screen gamma */ + *sp = (png_byte)((background->red >> 8) & 0xff); + *(sp + 1) = (png_byte)(background->red & 0xff); + *(sp + 2) = (png_byte)((background->green >> 8) & 0xff); + *(sp + 3) = (png_byte)(background->green & 0xff); + *(sp + 4) = (png_byte)((background->blue >> 8) & 0xff); + *(sp + 5) = (png_byte)(background->blue & 0xff); + } + + else + { + png_uint_16 v = gamma_16[*(sp + 1) >> gamma_shift][*sp]; + *sp = (png_byte)((v >> 8) & 0xff); + *(sp + 1) = (png_byte)(v & 0xff); + + v = gamma_16[*(sp + 3) >> gamma_shift][*(sp + 2)]; + *(sp + 2) = (png_byte)((v >> 8) & 0xff); + *(sp + 3) = (png_byte)(v & 0xff); + + v = gamma_16[*(sp + 5) >> gamma_shift][*(sp + 4)]; + *(sp + 4) = (png_byte)((v >> 8) & 0xff); + *(sp + 5) = (png_byte)(v & 0xff); + } + } + } + + else +#endif + { + sp = row; + for (i = 0; i < row_width; i++, sp += 6) + { + png_uint_16 r = (png_uint_16)(((*sp) << 8) + *(sp + 1)); + + png_uint_16 g = (png_uint_16)(((*(sp + 2)) << 8) + + *(sp + 3)); + + png_uint_16 b = (png_uint_16)(((*(sp + 4)) << 8) + + *(sp + 5)); + + if (r == trans_color->red && g == trans_color->green && + b == trans_color->blue) + { + *sp = (png_byte)((background->red >> 8) & 0xff); + *(sp + 1) = (png_byte)(background->red & 0xff); + *(sp + 2) = (png_byte)((background->green >> 8) & 0xff); + *(sp + 3) = (png_byte)(background->green & 0xff); + *(sp + 4) = (png_byte)((background->blue >> 8) & 0xff); + *(sp + 5) = (png_byte)(background->blue & 0xff); + } + } + } + } + break; + } + + case PNG_COLOR_TYPE_GRAY_ALPHA: + { + if (row_info->bit_depth == 8) + { +#ifdef PNG_READ_GAMMA_SUPPORTED + if (gamma_to_1 != NULL && gamma_from_1 != NULL && + gamma_table != NULL) + { + sp = row; + dp = row; + for (i = 0; i < row_width; i++, sp += 2, dp++) + { + png_uint_16 a = *(sp + 1); + + if (a == 0xff) + *dp = gamma_table[*sp]; + + else if (a == 0) + { + /* Background is already in screen gamma */ + *dp = (png_byte)background->gray; + } + + else + { + png_byte v, w; + + v = gamma_to_1[*sp]; + png_composite(w, v, a, background_1->gray); + *dp = gamma_from_1[w]; + } + } + } + else +#endif + { + sp = row; + dp = row; + for (i = 0; i < row_width; i++, sp += 2, dp++) + { + png_byte a = *(sp + 1); + + if (a == 0xff) + *dp = *sp; + +#ifdef PNG_READ_GAMMA_SUPPORTED + else if (a == 0) + *dp = (png_byte)background->gray; + + else + png_composite(*dp, *sp, a, background_1->gray); + +#else + *dp = (png_byte)background->gray; +#endif + } + } + } + else /* if (png_ptr->bit_depth == 16) */ + { +#ifdef PNG_READ_GAMMA_SUPPORTED + if (gamma_16 != NULL && gamma_16_from_1 != NULL && + gamma_16_to_1 != NULL) + { + sp = row; + dp = row; + for (i = 0; i < row_width; i++, sp += 4, dp += 2) + { + png_uint_16 a = (png_uint_16)(((*(sp + 2)) << 8) + + *(sp + 3)); + + if (a == (png_uint_16)0xffff) + { + png_uint_16 v; + + v = gamma_16[*(sp + 1) >> gamma_shift][*sp]; + *dp = (png_byte)((v >> 8) & 0xff); + *(dp + 1) = (png_byte)(v & 0xff); + } + +#ifdef PNG_READ_GAMMA_SUPPORTED + else if (a == 0) +#else + else +#endif + { + /* Background is already in screen gamma */ + *dp = (png_byte)((background->gray >> 8) & 0xff); + *(dp + 1) = (png_byte)(background->gray & 0xff); + } + +#ifdef PNG_READ_GAMMA_SUPPORTED + else + { + png_uint_16 g, v, w; + + g = gamma_16_to_1[*(sp + 1) >> gamma_shift][*sp]; + png_composite_16(v, g, a, background_1->gray); + w = gamma_16_from_1[(v&0xff) >> gamma_shift][v >> 8]; + *dp = (png_byte)((w >> 8) & 0xff); + *(dp + 1) = (png_byte)(w & 0xff); + } +#endif + } + } + else +#endif + { + sp = row; + dp = row; + for (i = 0; i < row_width; i++, sp += 4, dp += 2) + { + png_uint_16 a = (png_uint_16)(((*(sp + 2)) << 8) + + *(sp + 3)); + + if (a == (png_uint_16)0xffff) + png_memcpy(dp, sp, 2); + +#ifdef PNG_READ_GAMMA_SUPPORTED + else if (a == 0) +#else + else +#endif + { + *dp = (png_byte)((background->gray >> 8) & 0xff); + *(dp + 1) = (png_byte)(background->gray & 0xff); + } + +#ifdef PNG_READ_GAMMA_SUPPORTED + else + { + png_uint_16 g, v; + + g = (png_uint_16)(((*sp) << 8) + *(sp + 1)); + png_composite_16(v, g, a, background_1->gray); + *dp = (png_byte)((v >> 8) & 0xff); + *(dp + 1) = (png_byte)(v & 0xff); + } +#endif + } + } + } + break; + } + + case PNG_COLOR_TYPE_RGB_ALPHA: + { + if (row_info->bit_depth == 8) + { +#ifdef PNG_READ_GAMMA_SUPPORTED + if (gamma_to_1 != NULL && gamma_from_1 != NULL && + gamma_table != NULL) + { + sp = row; + dp = row; + for (i = 0; i < row_width; i++, sp += 4, dp += 3) + { + png_byte a = *(sp + 3); + + if (a == 0xff) + { + *dp = gamma_table[*sp]; + *(dp + 1) = gamma_table[*(sp + 1)]; + *(dp + 2) = gamma_table[*(sp + 2)]; + } + + else if (a == 0) + { + /* Background is already in screen gamma */ + *dp = (png_byte)background->red; + *(dp + 1) = (png_byte)background->green; + *(dp + 2) = (png_byte)background->blue; + } + + else + { + png_byte v, w; + + v = gamma_to_1[*sp]; + png_composite(w, v, a, background_1->red); + *dp = gamma_from_1[w]; + + v = gamma_to_1[*(sp + 1)]; + png_composite(w, v, a, background_1->green); + *(dp + 1) = gamma_from_1[w]; + + v = gamma_to_1[*(sp + 2)]; + png_composite(w, v, a, background_1->blue); + *(dp + 2) = gamma_from_1[w]; + } + } + } + else +#endif + { + sp = row; + dp = row; + for (i = 0; i < row_width; i++, sp += 4, dp += 3) + { + png_byte a = *(sp + 3); + + if (a == 0xff) + { + *dp = *sp; + *(dp + 1) = *(sp + 1); + *(dp + 2) = *(sp + 2); + } + + else if (a == 0) + { + *dp = (png_byte)background->red; + *(dp + 1) = (png_byte)background->green; + *(dp + 2) = (png_byte)background->blue; + } + + else + { + png_composite(*dp, *sp, a, background->red); + + png_composite(*(dp + 1), *(sp + 1), a, + background->green); + + png_composite(*(dp + 2), *(sp + 2), a, + background->blue); + } + } + } + } + else /* if (row_info->bit_depth == 16) */ + { +#ifdef PNG_READ_GAMMA_SUPPORTED + if (gamma_16 != NULL && gamma_16_from_1 != NULL && + gamma_16_to_1 != NULL) + { + sp = row; + dp = row; + for (i = 0; i < row_width; i++, sp += 8, dp += 6) + { + png_uint_16 a = (png_uint_16)(((png_uint_16)(*(sp + 6)) + << 8) + (png_uint_16)(*(sp + 7))); + + if (a == (png_uint_16)0xffff) + { + png_uint_16 v; + + v = gamma_16[*(sp + 1) >> gamma_shift][*sp]; + *dp = (png_byte)((v >> 8) & 0xff); + *(dp + 1) = (png_byte)(v & 0xff); + + v = gamma_16[*(sp + 3) >> gamma_shift][*(sp + 2)]; + *(dp + 2) = (png_byte)((v >> 8) & 0xff); + *(dp + 3) = (png_byte)(v & 0xff); + + v = gamma_16[*(sp + 5) >> gamma_shift][*(sp + 4)]; + *(dp + 4) = (png_byte)((v >> 8) & 0xff); + *(dp + 5) = (png_byte)(v & 0xff); + } + + else if (a == 0) + { + /* Background is already in screen gamma */ + *dp = (png_byte)((background->red >> 8) & 0xff); + *(dp + 1) = (png_byte)(background->red & 0xff); + *(dp + 2) = (png_byte)((background->green >> 8) & 0xff); + *(dp + 3) = (png_byte)(background->green & 0xff); + *(dp + 4) = (png_byte)((background->blue >> 8) & 0xff); + *(dp + 5) = (png_byte)(background->blue & 0xff); + } + + else + { + png_uint_16 v, w, x; + + v = gamma_16_to_1[*(sp + 1) >> gamma_shift][*sp]; + png_composite_16(w, v, a, background_1->red); + + x = gamma_16_from_1[((w&0xff) >> gamma_shift)][w >> 8]; + *dp = (png_byte)((x >> 8) & 0xff); + *(dp + 1) = (png_byte)(x & 0xff); + + v = gamma_16_to_1[*(sp + 3) >> gamma_shift][*(sp + 2)]; + png_composite_16(w, v, a, background_1->green); + + x = gamma_16_from_1[((w&0xff) >> gamma_shift)][w >> 8]; + *(dp + 2) = (png_byte)((x >> 8) & 0xff); + *(dp + 3) = (png_byte)(x & 0xff); + + v = gamma_16_to_1[*(sp + 5) >> gamma_shift][*(sp + 4)]; + png_composite_16(w, v, a, background_1->blue); + + x = gamma_16_from_1[(w & 0xff) >> gamma_shift][w >> 8]; + *(dp + 4) = (png_byte)((x >> 8) & 0xff); + *(dp + 5) = (png_byte)(x & 0xff); + } + } + } + + else +#endif + { + sp = row; + dp = row; + for (i = 0; i < row_width; i++, sp += 8, dp += 6) + { + png_uint_16 a = (png_uint_16)(((png_uint_16)(*(sp + 6)) + << 8) + (png_uint_16)(*(sp + 7))); + + if (a == (png_uint_16)0xffff) + { + png_memcpy(dp, sp, 6); + } + + else if (a == 0) + { + *dp = (png_byte)((background->red >> 8) & 0xff); + *(dp + 1) = (png_byte)(background->red & 0xff); + *(dp + 2) = (png_byte)((background->green >> 8) & 0xff); + *(dp + 3) = (png_byte)(background->green & 0xff); + *(dp + 4) = (png_byte)((background->blue >> 8) & 0xff); + *(dp + 5) = (png_byte)(background->blue & 0xff); + } + + else + { + png_uint_16 v; + + png_uint_16 r = (png_uint_16)(((*sp) << 8) + *(sp + 1)); + png_uint_16 g = (png_uint_16)(((*(sp + 2)) << 8) + + *(sp + 3)); + png_uint_16 b = (png_uint_16)(((*(sp + 4)) << 8) + + *(sp + 5)); + + png_composite_16(v, r, a, background->red); + *dp = (png_byte)((v >> 8) & 0xff); + *(dp + 1) = (png_byte)(v & 0xff); + + png_composite_16(v, g, a, background->green); + *(dp + 2) = (png_byte)((v >> 8) & 0xff); + *(dp + 3) = (png_byte)(v & 0xff); + + png_composite_16(v, b, a, background->blue); + *(dp + 4) = (png_byte)((v >> 8) & 0xff); + *(dp + 5) = (png_byte)(v & 0xff); + } + } + } + } + break; + } + + default: + break; + } + + if (row_info->color_type & PNG_COLOR_MASK_ALPHA) + { + row_info->color_type = (png_byte)(row_info->color_type & + ~PNG_COLOR_MASK_ALPHA); + row_info->channels--; + row_info->pixel_depth = (png_byte)(row_info->channels * + row_info->bit_depth); + row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, row_width); + } + } +} +#endif + +#ifdef PNG_READ_GAMMA_SUPPORTED +/* Gamma correct the image, avoiding the alpha channel. Make sure + * you do this after you deal with the transparency issue on grayscale + * or RGB images. If your bit depth is 8, use gamma_table, if it + * is 16, use gamma_16_table and gamma_shift. Build these with + * build_gamma_table(). + */ +void /* PRIVATE */ +png_do_gamma(png_row_infop row_info, png_bytep row, + png_const_bytep gamma_table, png_const_uint_16pp gamma_16_table, + int gamma_shift) +{ + png_bytep sp; + png_uint_32 i; + png_uint_32 row_width=row_info->width; + + png_debug(1, "in png_do_gamma"); + + if (((row_info->bit_depth <= 8 && gamma_table != NULL) || + (row_info->bit_depth == 16 && gamma_16_table != NULL))) + { + switch (row_info->color_type) + { + case PNG_COLOR_TYPE_RGB: + { + if (row_info->bit_depth == 8) + { + sp = row; + for (i = 0; i < row_width; i++) + { + *sp = gamma_table[*sp]; + sp++; + *sp = gamma_table[*sp]; + sp++; + *sp = gamma_table[*sp]; + sp++; + } + } + + else /* if (row_info->bit_depth == 16) */ + { + sp = row; + for (i = 0; i < row_width; i++) + { + png_uint_16 v; + + v = gamma_16_table[*(sp + 1) >> gamma_shift][*sp]; + *sp = (png_byte)((v >> 8) & 0xff); + *(sp + 1) = (png_byte)(v & 0xff); + sp += 2; + + v = gamma_16_table[*(sp + 1) >> gamma_shift][*sp]; + *sp = (png_byte)((v >> 8) & 0xff); + *(sp + 1) = (png_byte)(v & 0xff); + sp += 2; + + v = gamma_16_table[*(sp + 1) >> gamma_shift][*sp]; + *sp = (png_byte)((v >> 8) & 0xff); + *(sp + 1) = (png_byte)(v & 0xff); + sp += 2; + } + } + break; + } + + case PNG_COLOR_TYPE_RGB_ALPHA: + { + if (row_info->bit_depth == 8) + { + sp = row; + for (i = 0; i < row_width; i++) + { + *sp = gamma_table[*sp]; + sp++; + + *sp = gamma_table[*sp]; + sp++; + + *sp = gamma_table[*sp]; + sp++; + + sp++; + } + } + + else /* if (row_info->bit_depth == 16) */ + { + sp = row; + for (i = 0; i < row_width; i++) + { + png_uint_16 v = gamma_16_table[*(sp + 1) >> gamma_shift][*sp]; + *sp = (png_byte)((v >> 8) & 0xff); + *(sp + 1) = (png_byte)(v & 0xff); + sp += 2; + + v = gamma_16_table[*(sp + 1) >> gamma_shift][*sp]; + *sp = (png_byte)((v >> 8) & 0xff); + *(sp + 1) = (png_byte)(v & 0xff); + sp += 2; + + v = gamma_16_table[*(sp + 1) >> gamma_shift][*sp]; + *sp = (png_byte)((v >> 8) & 0xff); + *(sp + 1) = (png_byte)(v & 0xff); + sp += 4; + } + } + break; + } + + case PNG_COLOR_TYPE_GRAY_ALPHA: + { + if (row_info->bit_depth == 8) + { + sp = row; + for (i = 0; i < row_width; i++) + { + *sp = gamma_table[*sp]; + sp += 2; + } + } + + else /* if (row_info->bit_depth == 16) */ + { + sp = row; + for (i = 0; i < row_width; i++) + { + png_uint_16 v = gamma_16_table[*(sp + 1) >> gamma_shift][*sp]; + *sp = (png_byte)((v >> 8) & 0xff); + *(sp + 1) = (png_byte)(v & 0xff); + sp += 4; + } + } + break; + } + + case PNG_COLOR_TYPE_GRAY: + { + if (row_info->bit_depth == 2) + { + sp = row; + for (i = 0; i < row_width; i += 4) + { + int a = *sp & 0xc0; + int b = *sp & 0x30; + int c = *sp & 0x0c; + int d = *sp & 0x03; + + *sp = (png_byte)( + ((((int)gamma_table[a|(a>>2)|(a>>4)|(a>>6)]) ) & 0xc0)| + ((((int)gamma_table[(b<<2)|b|(b>>2)|(b>>4)])>>2) & 0x30)| + ((((int)gamma_table[(c<<4)|(c<<2)|c|(c>>2)])>>4) & 0x0c)| + ((((int)gamma_table[(d<<6)|(d<<4)|(d<<2)|d])>>6) )); + sp++; + } + } + + if (row_info->bit_depth == 4) + { + sp = row; + for (i = 0; i < row_width; i += 2) + { + int msb = *sp & 0xf0; + int lsb = *sp & 0x0f; + + *sp = (png_byte)((((int)gamma_table[msb | (msb >> 4)]) & 0xf0) + | (((int)gamma_table[(lsb << 4) | lsb]) >> 4)); + sp++; + } + } + + else if (row_info->bit_depth == 8) + { + sp = row; + for (i = 0; i < row_width; i++) + { + *sp = gamma_table[*sp]; + sp++; + } + } + + else if (row_info->bit_depth == 16) + { + sp = row; + for (i = 0; i < row_width; i++) + { + png_uint_16 v = gamma_16_table[*(sp + 1) >> gamma_shift][*sp]; + *sp = (png_byte)((v >> 8) & 0xff); + *(sp + 1) = (png_byte)(v & 0xff); + sp += 2; + } + } + break; + } + + default: + break; + } + } +} +#endif + +#ifdef PNG_READ_EXPAND_SUPPORTED +/* Expands a palette row to an RGB or RGBA row depending + * upon whether you supply trans and num_trans. + */ +void /* PRIVATE */ +png_do_expand_palette(png_row_infop row_info, png_bytep row, + png_const_colorp palette, png_const_bytep trans_alpha, int num_trans) +{ + int shift, value; + png_bytep sp, dp; + png_uint_32 i; + png_uint_32 row_width=row_info->width; + + png_debug(1, "in png_do_expand_palette"); + + if (row_info->color_type == PNG_COLOR_TYPE_PALETTE) + { + if (row_info->bit_depth < 8) + { + switch (row_info->bit_depth) + { + case 1: + { + sp = row + (png_size_t)((row_width - 1) >> 3); + dp = row + (png_size_t)row_width - 1; + shift = 7 - (int)((row_width + 7) & 0x07); + for (i = 0; i < row_width; i++) + { + if ((*sp >> shift) & 0x01) + *dp = 1; + + else + *dp = 0; + + if (shift == 7) + { + shift = 0; + sp--; + } + + else + shift++; + + dp--; + } + break; + } + + case 2: + { + sp = row + (png_size_t)((row_width - 1) >> 2); + dp = row + (png_size_t)row_width - 1; + shift = (int)((3 - ((row_width + 3) & 0x03)) << 1); + for (i = 0; i < row_width; i++) + { + value = (*sp >> shift) & 0x03; + *dp = (png_byte)value; + if (shift == 6) + { + shift = 0; + sp--; + } + + else + shift += 2; + + dp--; + } + break; + } + + case 4: + { + sp = row + (png_size_t)((row_width - 1) >> 1); + dp = row + (png_size_t)row_width - 1; + shift = (int)((row_width & 0x01) << 2); + for (i = 0; i < row_width; i++) + { + value = (*sp >> shift) & 0x0f; + *dp = (png_byte)value; + if (shift == 4) + { + shift = 0; + sp--; + } + + else + shift += 4; + + dp--; + } + break; + } + + default: + break; + } + row_info->bit_depth = 8; + row_info->pixel_depth = 8; + row_info->rowbytes = row_width; + } + + if (row_info->bit_depth == 8) + { + { + if (trans_alpha != NULL) + { + sp = row + (png_size_t)row_width - 1; + dp = row + (png_size_t)(row_width << 2) - 1; + + for (i = 0; i < row_width; i++) + { + if ((int)(*sp) >= num_trans) + *dp-- = 0xff; + + else + *dp-- = trans_alpha[*sp]; + + *dp-- = palette[*sp].blue; + *dp-- = palette[*sp].green; + *dp-- = palette[*sp].red; + sp--; + } + row_info->bit_depth = 8; + row_info->pixel_depth = 32; + row_info->rowbytes = row_width * 4; + row_info->color_type = 6; + row_info->channels = 4; + } + + else + { + sp = row + (png_size_t)row_width - 1; + dp = row + (png_size_t)(row_width * 3) - 1; + + for (i = 0; i < row_width; i++) + { + *dp-- = palette[*sp].blue; + *dp-- = palette[*sp].green; + *dp-- = palette[*sp].red; + sp--; + } + + row_info->bit_depth = 8; + row_info->pixel_depth = 24; + row_info->rowbytes = row_width * 3; + row_info->color_type = 2; + row_info->channels = 3; + } + } + } + } +} + +/* If the bit depth < 8, it is expanded to 8. Also, if the already + * expanded transparency value is supplied, an alpha channel is built. + */ +void /* PRIVATE */ +png_do_expand(png_row_infop row_info, png_bytep row, + png_const_color_16p trans_value) +{ + int shift, value; + png_bytep sp, dp; + png_uint_32 i; + png_uint_32 row_width=row_info->width; + + png_debug(1, "in png_do_expand"); + + { + if (row_info->color_type == PNG_COLOR_TYPE_GRAY) + { + png_uint_16 gray = (png_uint_16)(trans_value ? trans_value->gray : 0); + + if (row_info->bit_depth < 8) + { + switch (row_info->bit_depth) + { + case 1: + { + gray = (png_uint_16)((gray & 0x01) * 0xff); + sp = row + (png_size_t)((row_width - 1) >> 3); + dp = row + (png_size_t)row_width - 1; + shift = 7 - (int)((row_width + 7) & 0x07); + for (i = 0; i < row_width; i++) + { + if ((*sp >> shift) & 0x01) + *dp = 0xff; + + else + *dp = 0; + + if (shift == 7) + { + shift = 0; + sp--; + } + + else + shift++; + + dp--; + } + break; + } + + case 2: + { + gray = (png_uint_16)((gray & 0x03) * 0x55); + sp = row + (png_size_t)((row_width - 1) >> 2); + dp = row + (png_size_t)row_width - 1; + shift = (int)((3 - ((row_width + 3) & 0x03)) << 1); + for (i = 0; i < row_width; i++) + { + value = (*sp >> shift) & 0x03; + *dp = (png_byte)(value | (value << 2) | (value << 4) | + (value << 6)); + if (shift == 6) + { + shift = 0; + sp--; + } + + else + shift += 2; + + dp--; + } + break; + } + + case 4: + { + gray = (png_uint_16)((gray & 0x0f) * 0x11); + sp = row + (png_size_t)((row_width - 1) >> 1); + dp = row + (png_size_t)row_width - 1; + shift = (int)((1 - ((row_width + 1) & 0x01)) << 2); + for (i = 0; i < row_width; i++) + { + value = (*sp >> shift) & 0x0f; + *dp = (png_byte)(value | (value << 4)); + if (shift == 4) + { + shift = 0; + sp--; + } + + else + shift = 4; + + dp--; + } + break; + } + + default: + break; + } + + row_info->bit_depth = 8; + row_info->pixel_depth = 8; + row_info->rowbytes = row_width; + } + + if (trans_value != NULL) + { + if (row_info->bit_depth == 8) + { + gray = gray & 0xff; + sp = row + (png_size_t)row_width - 1; + dp = row + (png_size_t)(row_width << 1) - 1; + + for (i = 0; i < row_width; i++) + { + if (*sp == gray) + *dp-- = 0; + + else + *dp-- = 0xff; + + *dp-- = *sp--; + } + } + + else if (row_info->bit_depth == 16) + { + png_byte gray_high = (png_byte)((gray >> 8) & 0xff); + png_byte gray_low = (png_byte)(gray & 0xff); + sp = row + row_info->rowbytes - 1; + dp = row + (row_info->rowbytes << 1) - 1; + for (i = 0; i < row_width; i++) + { + if (*(sp - 1) == gray_high && *(sp) == gray_low) + { + *dp-- = 0; + *dp-- = 0; + } + + else + { + *dp-- = 0xff; + *dp-- = 0xff; + } + + *dp-- = *sp--; + *dp-- = *sp--; + } + } + + row_info->color_type = PNG_COLOR_TYPE_GRAY_ALPHA; + row_info->channels = 2; + row_info->pixel_depth = (png_byte)(row_info->bit_depth << 1); + row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, + row_width); + } + } + else if (row_info->color_type == PNG_COLOR_TYPE_RGB && trans_value) + { + if (row_info->bit_depth == 8) + { + png_byte red = (png_byte)(trans_value->red & 0xff); + png_byte green = (png_byte)(trans_value->green & 0xff); + png_byte blue = (png_byte)(trans_value->blue & 0xff); + sp = row + (png_size_t)row_info->rowbytes - 1; + dp = row + (png_size_t)(row_width << 2) - 1; + for (i = 0; i < row_width; i++) + { + if (*(sp - 2) == red && *(sp - 1) == green && *(sp) == blue) + *dp-- = 0; + + else + *dp-- = 0xff; + + *dp-- = *sp--; + *dp-- = *sp--; + *dp-- = *sp--; + } + } + else if (row_info->bit_depth == 16) + { + png_byte red_high = (png_byte)((trans_value->red >> 8) & 0xff); + png_byte green_high = (png_byte)((trans_value->green >> 8) & 0xff); + png_byte blue_high = (png_byte)((trans_value->blue >> 8) & 0xff); + png_byte red_low = (png_byte)(trans_value->red & 0xff); + png_byte green_low = (png_byte)(trans_value->green & 0xff); + png_byte blue_low = (png_byte)(trans_value->blue & 0xff); + sp = row + row_info->rowbytes - 1; + dp = row + (png_size_t)(row_width << 3) - 1; + for (i = 0; i < row_width; i++) + { + if (*(sp - 5) == red_high && + *(sp - 4) == red_low && + *(sp - 3) == green_high && + *(sp - 2) == green_low && + *(sp - 1) == blue_high && + *(sp ) == blue_low) + { + *dp-- = 0; + *dp-- = 0; + } + + else + { + *dp-- = 0xff; + *dp-- = 0xff; + } + + *dp-- = *sp--; + *dp-- = *sp--; + *dp-- = *sp--; + *dp-- = *sp--; + *dp-- = *sp--; + *dp-- = *sp--; + } + } + row_info->color_type = PNG_COLOR_TYPE_RGB_ALPHA; + row_info->channels = 4; + row_info->pixel_depth = (png_byte)(row_info->bit_depth << 2); + row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, row_width); + } + } +} +#endif + +#ifdef PNG_READ_QUANTIZE_SUPPORTED +void /* PRIVATE */ +png_do_quantize(png_row_infop row_info, png_bytep row, + png_const_bytep palette_lookup, png_const_bytep quantize_lookup) +{ + png_bytep sp, dp; + png_uint_32 i; + png_uint_32 row_width=row_info->width; + + png_debug(1, "in png_do_quantize"); + + if (row_info->bit_depth == 8) + { + if (row_info->color_type == PNG_COLOR_TYPE_RGB && palette_lookup) + { + int r, g, b, p; + sp = row; + dp = row; + for (i = 0; i < row_width; i++) + { + r = *sp++; + g = *sp++; + b = *sp++; + + /* This looks real messy, but the compiler will reduce + * it down to a reasonable formula. For example, with + * 5 bits per color, we get: + * p = (((r >> 3) & 0x1f) << 10) | + * (((g >> 3) & 0x1f) << 5) | + * ((b >> 3) & 0x1f); + */ + p = (((r >> (8 - PNG_QUANTIZE_RED_BITS)) & + ((1 << PNG_QUANTIZE_RED_BITS) - 1)) << + (PNG_QUANTIZE_GREEN_BITS + PNG_QUANTIZE_BLUE_BITS)) | + (((g >> (8 - PNG_QUANTIZE_GREEN_BITS)) & + ((1 << PNG_QUANTIZE_GREEN_BITS) - 1)) << + (PNG_QUANTIZE_BLUE_BITS)) | + ((b >> (8 - PNG_QUANTIZE_BLUE_BITS)) & + ((1 << PNG_QUANTIZE_BLUE_BITS) - 1)); + + *dp++ = palette_lookup[p]; + } + + row_info->color_type = PNG_COLOR_TYPE_PALETTE; + row_info->channels = 1; + row_info->pixel_depth = row_info->bit_depth; + row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, row_width); + } + + else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA && + palette_lookup != NULL) + { + int r, g, b, p; + sp = row; + dp = row; + for (i = 0; i < row_width; i++) + { + r = *sp++; + g = *sp++; + b = *sp++; + sp++; + + p = (((r >> (8 - PNG_QUANTIZE_RED_BITS)) & + ((1 << PNG_QUANTIZE_RED_BITS) - 1)) << + (PNG_QUANTIZE_GREEN_BITS + PNG_QUANTIZE_BLUE_BITS)) | + (((g >> (8 - PNG_QUANTIZE_GREEN_BITS)) & + ((1 << PNG_QUANTIZE_GREEN_BITS) - 1)) << + (PNG_QUANTIZE_BLUE_BITS)) | + ((b >> (8 - PNG_QUANTIZE_BLUE_BITS)) & + ((1 << PNG_QUANTIZE_BLUE_BITS) - 1)); + + *dp++ = palette_lookup[p]; + } + + row_info->color_type = PNG_COLOR_TYPE_PALETTE; + row_info->channels = 1; + row_info->pixel_depth = row_info->bit_depth; + row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, row_width); + } + + else if (row_info->color_type == PNG_COLOR_TYPE_PALETTE && + quantize_lookup) + { + sp = row; + + for (i = 0; i < row_width; i++, sp++) + { + *sp = quantize_lookup[*sp]; + } + } + } +} +#endif /* PNG_READ_QUANTIZE_SUPPORTED */ + +#ifdef PNG_MNG_FEATURES_SUPPORTED +/* Undoes intrapixel differencing */ +void /* PRIVATE */ +png_do_read_intrapixel(png_row_infop row_info, png_bytep row) +{ + png_debug(1, "in png_do_read_intrapixel"); + + if ( + (row_info->color_type & PNG_COLOR_MASK_COLOR)) + { + int bytes_per_pixel; + png_uint_32 row_width = row_info->width; + + if (row_info->bit_depth == 8) + { + png_bytep rp; + png_uint_32 i; + + if (row_info->color_type == PNG_COLOR_TYPE_RGB) + bytes_per_pixel = 3; + + else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) + bytes_per_pixel = 4; + + else + return; + + for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel) + { + *(rp) = (png_byte)((256 + *rp + *(rp + 1)) & 0xff); + *(rp+2) = (png_byte)((256 + *(rp + 2) + *(rp + 1)) & 0xff); + } + } + else if (row_info->bit_depth == 16) + { + png_bytep rp; + png_uint_32 i; + + if (row_info->color_type == PNG_COLOR_TYPE_RGB) + bytes_per_pixel = 6; + + else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) + bytes_per_pixel = 8; + + else + return; + + for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel) + { + png_uint_32 s0 = (*(rp ) << 8) | *(rp + 1); + png_uint_32 s1 = (*(rp + 2) << 8) | *(rp + 3); + png_uint_32 s2 = (*(rp + 4) << 8) | *(rp + 5); + png_uint_32 red = (png_uint_32)((s0 + s1 + 65536L) & 0xffffL); + png_uint_32 blue = (png_uint_32)((s2 + s1 + 65536L) & 0xffffL); + *(rp ) = (png_byte)((red >> 8) & 0xff); + *(rp + 1) = (png_byte)(red & 0xff); + *(rp + 4) = (png_byte)((blue >> 8) & 0xff); + *(rp + 5) = (png_byte)(blue & 0xff); + } + } + } +} +#endif /* PNG_MNG_FEATURES_SUPPORTED */ +#endif /* PNG_READ_SUPPORTED */ diff --git a/programs/develop/libraries/libpng/pngrutil.c b/programs/develop/libraries/libpng/pngrutil.c new file mode 100644 index 0000000000..4c3cd53813 --- /dev/null +++ b/programs/develop/libraries/libpng/pngrutil.c @@ -0,0 +1,3616 @@ + +/* pngrutil.c - utilities to read a PNG file + * + * Last changed in libpng 1.5.1 [February 3, 2011] + * Copyright (c) 1998-2011 Glenn Randers-Pehrson + * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) + * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) + * + * This code is released under the libpng license. + * For conditions of distribution and use, see the disclaimer + * and license in png.h + * + * This file contains routines that are only called from within + * libpng itself during the course of reading an image. + */ + +#include "pngpriv.h" + +#ifdef PNG_READ_SUPPORTED + +#define png_strtod(p,a,b) strtod(a,b) + +png_uint_32 PNGAPI +png_get_uint_31(png_structp png_ptr, png_const_bytep buf) +{ + png_uint_32 uval = png_get_uint_32(buf); + + if (uval > PNG_UINT_31_MAX) + png_error(png_ptr, "PNG unsigned integer out of range"); + + return (uval); +} + +#if defined(PNG_READ_gAMA_SUPPORTED) || defined(PNG_READ_cHRM_SUPPORTED) +/* The following is a variation on the above for use with the fixed + * point values used for gAMA and cHRM. Instead of png_error it + * issues a warning and returns (-1) - an invalid value because both + * gAMA and cHRM use *unsigned* integers for fixed point values. + */ +#define PNG_FIXED_ERROR (-1) + +static png_fixed_point /* PRIVATE */ +png_get_fixed_point(png_structp png_ptr, png_const_bytep buf) +{ + png_uint_32 uval = png_get_uint_32(buf); + + if (uval <= PNG_UINT_31_MAX) + return (png_fixed_point)uval; /* known to be in range */ + + /* The caller can turn off the warning by passing NULL. */ + if (png_ptr != NULL) + png_warning(png_ptr, "PNG fixed point integer out of range"); + + return PNG_FIXED_ERROR; +} +#endif + +#ifdef PNG_READ_INT_FUNCTIONS_SUPPORTED +/* NOTE: the read macros will obscure these definitions, so that if + * PNG_USE_READ_MACROS is set the library will not use them internally, + * but the APIs will still be available externally. + * + * The parentheses around "PNGAPI function_name" in the following three + * functions are necessary because they allow the macros to co-exist with + * these (unused but exported) functions. + */ + +/* Grab an unsigned 32-bit integer from a buffer in big-endian format. */ +png_uint_32 (PNGAPI +png_get_uint_32)(png_const_bytep buf) +{ + png_uint_32 uval = + ((png_uint_32)(*(buf )) << 24) + + ((png_uint_32)(*(buf + 1)) << 16) + + ((png_uint_32)(*(buf + 2)) << 8) + + ((png_uint_32)(*(buf + 3)) ) ; + + return uval; +} + +/* Grab a signed 32-bit integer from a buffer in big-endian format. The + * data is stored in the PNG file in two's complement format and there + * is no guarantee that a 'png_int_32' is exactly 32 bits, therefore + * the following code does a two's complement to native conversion. + */ +png_int_32 (PNGAPI +png_get_int_32)(png_const_bytep buf) +{ + png_uint_32 uval = png_get_uint_32(buf); + if ((uval & 0x80000000L) == 0) /* non-negative */ + return uval; + + uval = (uval ^ 0xffffffffL) + 1; /* 2's complement: -x = ~x+1 */ + return -(png_int_32)uval; +} + +/* Grab an unsigned 16-bit integer from a buffer in big-endian format. */ +png_uint_16 (PNGAPI +png_get_uint_16)(png_const_bytep buf) +{ + /* ANSI-C requires an int value to accomodate at least 16 bits so this + * works and allows the compiler not to worry about possible narrowing + * on 32 bit systems. (Pre-ANSI systems did not make integers smaller + * than 16 bits either.) + */ + unsigned int val = + ((unsigned int)(*buf) << 8) + + ((unsigned int)(*(buf + 1))); + + return (png_uint_16)val; +} + +#endif /* PNG_READ_INT_FUNCTIONS_SUPPORTED */ + +/* Read and check the PNG file signature */ +void /* PRIVATE */ +png_read_sig(png_structp png_ptr, png_infop info_ptr) +{ + png_size_t num_checked, num_to_check; + + /* Exit if the user application does not expect a signature. */ + if (png_ptr->sig_bytes >= 8) + return; + + num_checked = png_ptr->sig_bytes; + num_to_check = 8 - num_checked; + +#ifdef PNG_IO_STATE_SUPPORTED + png_ptr->io_state = PNG_IO_READING | PNG_IO_SIGNATURE; +#endif + + /* The signature must be serialized in a single I/O call. */ + png_read_data(png_ptr, &(info_ptr->signature[num_checked]), num_to_check); + png_ptr->sig_bytes = 8; + + if (png_sig_cmp(info_ptr->signature, num_checked, num_to_check)) + { + if (num_checked < 4 && + png_sig_cmp(info_ptr->signature, num_checked, num_to_check - 4)) + png_error(png_ptr, "Not a PNG file"); + else + png_error(png_ptr, "PNG file corrupted by ASCII conversion"); + } + if (num_checked < 3) + png_ptr->mode |= PNG_HAVE_PNG_SIGNATURE; +} + +/* Read the chunk header (length + type name). + * Put the type name into png_ptr->chunk_name, and return the length. + */ +png_uint_32 /* PRIVATE */ +png_read_chunk_header(png_structp png_ptr) +{ + png_byte buf[8]; + png_uint_32 length; + +#ifdef PNG_IO_STATE_SUPPORTED + png_ptr->io_state = PNG_IO_READING | PNG_IO_CHUNK_HDR; +#endif + + /* Read the length and the chunk name. + * This must be performed in a single I/O call. + */ + png_read_data(png_ptr, buf, 8); + length = png_get_uint_31(png_ptr, buf); + + /* Put the chunk name into png_ptr->chunk_name. */ + png_memcpy(png_ptr->chunk_name, buf + 4, 4); + + png_debug2(0, "Reading %s chunk, length = %u", + png_ptr->chunk_name, length); + + /* Reset the crc and run it over the chunk name. */ + png_reset_crc(png_ptr); + png_calculate_crc(png_ptr, png_ptr->chunk_name, 4); + + /* Check to see if chunk name is valid. */ + png_check_chunk_name(png_ptr, png_ptr->chunk_name); + +#ifdef PNG_IO_STATE_SUPPORTED + png_ptr->io_state = PNG_IO_READING | PNG_IO_CHUNK_DATA; +#endif + + return length; +} + +/* Read data, and (optionally) run it through the CRC. */ +void /* PRIVATE */ +png_crc_read(png_structp png_ptr, png_bytep buf, png_size_t length) +{ + if (png_ptr == NULL) + return; + + png_read_data(png_ptr, buf, length); + png_calculate_crc(png_ptr, buf, length); +} + +/* Optionally skip data and then check the CRC. Depending on whether we + * are reading a ancillary or critical chunk, and how the program has set + * things up, we may calculate the CRC on the data and print a message. + * Returns '1' if there was a CRC error, '0' otherwise. + */ +int /* PRIVATE */ +png_crc_finish(png_structp png_ptr, png_uint_32 skip) +{ + png_size_t i; + png_size_t istop = png_ptr->zbuf_size; + + for (i = (png_size_t)skip; i > istop; i -= istop) + { + png_crc_read(png_ptr, png_ptr->zbuf, png_ptr->zbuf_size); + } + + if (i) + { + png_crc_read(png_ptr, png_ptr->zbuf, i); + } + + if (png_crc_error(png_ptr)) + { + if (((png_ptr->chunk_name[0] & 0x20) && /* Ancillary */ + !(png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_NOWARN)) || + (!(png_ptr->chunk_name[0] & 0x20) && /* Critical */ + (png_ptr->flags & PNG_FLAG_CRC_CRITICAL_USE))) + { + png_chunk_warning(png_ptr, "CRC error"); + } + + else + { + png_chunk_benign_error(png_ptr, "CRC error"); + return (0); + } + + return (1); + } + + return (0); +} + +/* Compare the CRC stored in the PNG file with that calculated by libpng from + * the data it has read thus far. + */ +int /* PRIVATE */ +png_crc_error(png_structp png_ptr) +{ + png_byte crc_bytes[4]; + png_uint_32 crc; + int need_crc = 1; + + if (png_ptr->chunk_name[0] & 0x20) /* ancillary */ + { + if ((png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_MASK) == + (PNG_FLAG_CRC_ANCILLARY_USE | PNG_FLAG_CRC_ANCILLARY_NOWARN)) + need_crc = 0; + } + + else /* critical */ + { + if (png_ptr->flags & PNG_FLAG_CRC_CRITICAL_IGNORE) + need_crc = 0; + } + +#ifdef PNG_IO_STATE_SUPPORTED + png_ptr->io_state = PNG_IO_READING | PNG_IO_CHUNK_CRC; +#endif + + /* The chunk CRC must be serialized in a single I/O call. */ + png_read_data(png_ptr, crc_bytes, 4); + + if (need_crc) + { + crc = png_get_uint_32(crc_bytes); + return ((int)(crc != png_ptr->crc)); + } + + else + return (0); +} + +#if defined(PNG_READ_zTXt_SUPPORTED) || defined(PNG_READ_iTXt_SUPPORTED) || \ + defined(PNG_READ_iCCP_SUPPORTED) +static png_size_t +png_inflate(png_structp png_ptr, png_bytep data, png_size_t size, + png_bytep output, png_size_t output_size) +{ + png_size_t count = 0; + + /* zlib can't necessarily handle more than 65535 bytes at once (i.e. it can't + * even necessarily handle 65536 bytes) because the type uInt is "16 bits or + * more". Consequently it is necessary to chunk the input to zlib. This + * code uses ZLIB_IO_MAX, from pngpriv.h, as the maximum (the maximum value + * that can be stored in a uInt.) It is possible to set ZLIB_IO_MAX to a + * lower value in pngpriv.h and this may sometimes have a performance + * advantage, because it forces access of the input data to be separated from + * at least some of the use by some period of time. + */ + png_ptr->zstream.next_in = data; + /* avail_in is set below from 'size' */ + png_ptr->zstream.avail_in = 0; + + while (1) + { + int ret, avail; + + /* The setting of 'avail_in' used to be outside the loop, by setting it + * inside it is possible to chunk the input to zlib and simply rely on + * zlib to advance the 'next_in' pointer. This allows arbitrary amounts o + * data to be passed through zlib at the unavoidable cost of requiring a + * window save (memcpy of up to 32768 output bytes) every ZLIB_IO_MAX + * input bytes. + */ + if (png_ptr->zstream.avail_in == 0 && size > 0) + { + if (size <= ZLIB_IO_MAX) + { + /* The value is less than ZLIB_IO_MAX so the cast is safe: */ + png_ptr->zstream.avail_in = (uInt)size; + size = 0; + } + + else + { + png_ptr->zstream.avail_in = ZLIB_IO_MAX; + size -= ZLIB_IO_MAX; + } + } + + /* Reset the output buffer each time round - we empty it + * after every inflate call. + */ + png_ptr->zstream.next_out = png_ptr->zbuf; + png_ptr->zstream.avail_out = png_ptr->zbuf_size; + + ret = inflate(&png_ptr->zstream, Z_NO_FLUSH); + avail = png_ptr->zbuf_size - png_ptr->zstream.avail_out; + + /* First copy/count any new output - but only if we didn't + * get an error code. + */ + if ((ret == Z_OK || ret == Z_STREAM_END) && avail > 0) + { + png_size_t space = avail; /* > 0, see above */ + + if (output != 0 && output_size > count) + { + png_size_t copy = output_size - count; + + if (space < copy) + copy = space; + + png_memcpy(output + count, png_ptr->zbuf, copy); + } + count += space; + } + + if (ret == Z_OK) + continue; + + /* Termination conditions - always reset the zstream, it + * must be left in inflateInit state. + */ + png_ptr->zstream.avail_in = 0; + inflateReset(&png_ptr->zstream); + + if (ret == Z_STREAM_END) + return count; /* NOTE: may be zero. */ + + /* Now handle the error codes - the API always returns 0 + * and the error message is dumped into the uncompressed + * buffer if available. + */ + { + PNG_CONST char *msg; +#ifdef PNG_CONSOLE_IO_SUPPORTED + char umsg[52]; +#endif + if (png_ptr->zstream.msg != 0) + msg = png_ptr->zstream.msg; + + else + { +#ifdef PNG_CONSOLE_IO_SUPPORTED + switch (ret) + { + case Z_BUF_ERROR: + msg = "Buffer error in compressed datastream in %s chunk"; + break; + + case Z_DATA_ERROR: + msg = "Data error in compressed datastream in %s chunk"; + break; + + default: + msg = "Incomplete compressed datastream in %s chunk"; + break; + } + + png_snprintf(umsg, sizeof umsg, msg, png_ptr->chunk_name); + msg = umsg; +#else + msg = "Damaged compressed datastream in chunk other than IDAT"; +#endif + } + + png_warning(png_ptr, msg); + } + + /* 0 means an error - notice that this code simply ignores + * zero length compressed chunks as a result. + */ + return 0; + } +} + +/* + * Decompress trailing data in a chunk. The assumption is that chunkdata + * points at an allocated area holding the contents of a chunk with a + * trailing compressed part. What we get back is an allocated area + * holding the original prefix part and an uncompressed version of the + * trailing part (the malloc area passed in is freed). + */ +void /* PRIVATE */ +png_decompress_chunk(png_structp png_ptr, int comp_type, + png_size_t chunklength, + png_size_t prefix_size, png_size_t *newlength) +{ + /* The caller should guarantee this */ + if (prefix_size > chunklength) + { + /* The recovery is to delete the chunk. */ + png_warning(png_ptr, "invalid chunklength"); + prefix_size = 0; /* To delete everything */ + } + + else if (comp_type == PNG_COMPRESSION_TYPE_BASE) + { + png_size_t expanded_size = png_inflate(png_ptr, + (png_bytep)(png_ptr->chunkdata + prefix_size), + chunklength - prefix_size, + 0, /*output*/ + 0); /*output size*/ + + /* Now check the limits on this chunk - if the limit fails the + * compressed data will be removed, the prefix will remain. + */ +#ifdef PNG_SET_CHUNK_MALLOC_LIMIT_SUPPORTED + if (png_ptr->user_chunk_malloc_max && + (prefix_size + expanded_size >= png_ptr->user_chunk_malloc_max - 1)) +#else +# ifdef PNG_USER_CHUNK_MALLOC_MAX + if ((PNG_USER_CHUNK_MALLOC_MAX > 0) && + prefix_size + expanded_size >= PNG_USER_CHUNK_MALLOC_MAX - 1) +# endif +#endif + png_warning(png_ptr, "Exceeded size limit while expanding chunk"); + + /* If the size is zero either there was an error and a message + * has already been output (warning) or the size really is zero + * and we have nothing to do - the code will exit through the + * error case below. + */ +#if defined(PNG_SET_CHUNK_MALLOC_LIMIT_SUPPORTED) || \ + defined(PNG_USER_CHUNK_MALLOC_MAX) + else if (expanded_size > 0) +#else + if (expanded_size > 0) +#endif + { + /* Success (maybe) - really uncompress the chunk. */ + png_size_t new_size = 0; + png_charp text = png_malloc_warn(png_ptr, + prefix_size + expanded_size + 1); + + if (text != NULL) + { + png_memcpy(text, png_ptr->chunkdata, prefix_size); + new_size = png_inflate(png_ptr, + (png_bytep)(png_ptr->chunkdata + prefix_size), + chunklength - prefix_size, + (png_bytep)(text + prefix_size), expanded_size); + text[prefix_size + expanded_size] = 0; /* just in case */ + + if (new_size == expanded_size) + { + png_free(png_ptr, png_ptr->chunkdata); + png_ptr->chunkdata = text; + *newlength = prefix_size + expanded_size; + return; /* The success return! */ + } + + png_warning(png_ptr, "png_inflate logic error"); + png_free(png_ptr, text); + } + + else + png_warning(png_ptr, "Not enough memory to decompress chunk"); + } + } + + else /* if (comp_type != PNG_COMPRESSION_TYPE_BASE) */ + { +#ifdef PNG_STDIO_SUPPORTED + char umsg[50]; + + png_snprintf(umsg, sizeof umsg, + "Unknown zTXt compression type %d", comp_type); + png_warning(png_ptr, umsg); +#else + png_warning(png_ptr, "Unknown zTXt compression type"); +#endif + + /* The recovery is to simply drop the data. */ + } + + /* Generic error return - leave the prefix, delete the compressed + * data, reallocate the chunkdata to remove the potentially large + * amount of compressed data. + */ + { + png_charp text = png_malloc_warn(png_ptr, prefix_size + 1); + + if (text != NULL) + { + if (prefix_size > 0) + png_memcpy(text, png_ptr->chunkdata, prefix_size); + + png_free(png_ptr, png_ptr->chunkdata); + png_ptr->chunkdata = text; + + /* This is an extra zero in the 'uncompressed' part. */ + *(png_ptr->chunkdata + prefix_size) = 0x00; + } + /* Ignore a malloc error here - it is safe. */ + } + + *newlength = prefix_size; +} +#endif + +/* Read and check the IDHR chunk */ +void /* PRIVATE */ +png_handle_IHDR(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +{ + png_byte buf[13]; + png_uint_32 width, height; + int bit_depth, color_type, compression_type, filter_type; + int interlace_type; + + png_debug(1, "in png_handle_IHDR"); + + if (png_ptr->mode & PNG_HAVE_IHDR) + png_error(png_ptr, "Out of place IHDR"); + + /* Check the length */ + if (length != 13) + png_error(png_ptr, "Invalid IHDR chunk"); + + png_ptr->mode |= PNG_HAVE_IHDR; + + png_crc_read(png_ptr, buf, 13); + png_crc_finish(png_ptr, 0); + + width = png_get_uint_31(png_ptr, buf); + height = png_get_uint_31(png_ptr, buf + 4); + bit_depth = buf[8]; + color_type = buf[9]; + compression_type = buf[10]; + filter_type = buf[11]; + interlace_type = buf[12]; + + /* Set internal variables */ + png_ptr->width = width; + png_ptr->height = height; + png_ptr->bit_depth = (png_byte)bit_depth; + png_ptr->interlaced = (png_byte)interlace_type; + png_ptr->color_type = (png_byte)color_type; +#ifdef PNG_MNG_FEATURES_SUPPORTED + png_ptr->filter_type = (png_byte)filter_type; +#endif + png_ptr->compression_type = (png_byte)compression_type; + + /* Find number of channels */ + switch (png_ptr->color_type) + { + default: /* invalid, png_set_IHDR calls png_error */ + case PNG_COLOR_TYPE_GRAY: + case PNG_COLOR_TYPE_PALETTE: + png_ptr->channels = 1; + break; + + case PNG_COLOR_TYPE_RGB: + png_ptr->channels = 3; + break; + + case PNG_COLOR_TYPE_GRAY_ALPHA: + png_ptr->channels = 2; + break; + + case PNG_COLOR_TYPE_RGB_ALPHA: + png_ptr->channels = 4; + break; + } + + /* Set up other useful info */ + png_ptr->pixel_depth = (png_byte)(png_ptr->bit_depth * + png_ptr->channels); + png_ptr->rowbytes = PNG_ROWBYTES(png_ptr->pixel_depth, png_ptr->width); + png_debug1(3, "bit_depth = %d", png_ptr->bit_depth); + png_debug1(3, "channels = %d", png_ptr->channels); + png_debug1(3, "rowbytes = %lu", (unsigned long)png_ptr->rowbytes); + png_set_IHDR(png_ptr, info_ptr, width, height, bit_depth, + color_type, interlace_type, compression_type, filter_type); +} + +/* Read and check the palette */ +void /* PRIVATE */ +png_handle_PLTE(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +{ + png_color palette[PNG_MAX_PALETTE_LENGTH]; + int num, i; +#ifdef PNG_POINTER_INDEXING_SUPPORTED + png_colorp pal_ptr; +#endif + + png_debug(1, "in png_handle_PLTE"); + + if (!(png_ptr->mode & PNG_HAVE_IHDR)) + png_error(png_ptr, "Missing IHDR before PLTE"); + + else if (png_ptr->mode & PNG_HAVE_IDAT) + { + png_warning(png_ptr, "Invalid PLTE after IDAT"); + png_crc_finish(png_ptr, length); + return; + } + + else if (png_ptr->mode & PNG_HAVE_PLTE) + png_error(png_ptr, "Duplicate PLTE chunk"); + + png_ptr->mode |= PNG_HAVE_PLTE; + + if (!(png_ptr->color_type&PNG_COLOR_MASK_COLOR)) + { + png_warning(png_ptr, + "Ignoring PLTE chunk in grayscale PNG"); + png_crc_finish(png_ptr, length); + return; + } + +#ifndef PNG_READ_OPT_PLTE_SUPPORTED + if (png_ptr->color_type != PNG_COLOR_TYPE_PALETTE) + { + png_crc_finish(png_ptr, length); + return; + } +#endif + + if (length > 3*PNG_MAX_PALETTE_LENGTH || length % 3) + { + if (png_ptr->color_type != PNG_COLOR_TYPE_PALETTE) + { + png_warning(png_ptr, "Invalid palette chunk"); + png_crc_finish(png_ptr, length); + return; + } + + else + { + png_error(png_ptr, "Invalid palette chunk"); + } + } + + num = (int)length / 3; + +#ifdef PNG_POINTER_INDEXING_SUPPORTED + for (i = 0, pal_ptr = palette; i < num; i++, pal_ptr++) + { + png_byte buf[3]; + + png_crc_read(png_ptr, buf, 3); + pal_ptr->red = buf[0]; + pal_ptr->green = buf[1]; + pal_ptr->blue = buf[2]; + } +#else + for (i = 0; i < num; i++) + { + png_byte buf[3]; + + png_crc_read(png_ptr, buf, 3); + /* Don't depend upon png_color being any order */ + palette[i].red = buf[0]; + palette[i].green = buf[1]; + palette[i].blue = buf[2]; + } +#endif + + /* If we actually need the PLTE chunk (ie for a paletted image), we do + * whatever the normal CRC configuration tells us. However, if we + * have an RGB image, the PLTE can be considered ancillary, so + * we will act as though it is. + */ +#ifndef PNG_READ_OPT_PLTE_SUPPORTED + if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) +#endif + { + png_crc_finish(png_ptr, 0); + } + +#ifndef PNG_READ_OPT_PLTE_SUPPORTED + else if (png_crc_error(png_ptr)) /* Only if we have a CRC error */ + { + /* If we don't want to use the data from an ancillary chunk, + * we have two options: an error abort, or a warning and we + * ignore the data in this chunk (which should be OK, since + * it's considered ancillary for a RGB or RGBA image). + */ + if (!(png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_USE)) + { + if (png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_NOWARN) + { + png_chunk_benign_error(png_ptr, "CRC error"); + } + + else + { + png_chunk_warning(png_ptr, "CRC error"); + return; + } + } + + /* Otherwise, we (optionally) emit a warning and use the chunk. */ + else if (!(png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_NOWARN)) + { + png_chunk_warning(png_ptr, "CRC error"); + } + } +#endif + + png_set_PLTE(png_ptr, info_ptr, palette, num); + +#ifdef PNG_READ_tRNS_SUPPORTED + if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) + { + if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_tRNS)) + { + if (png_ptr->num_trans > (png_uint_16)num) + { + png_warning(png_ptr, "Truncating incorrect tRNS chunk length"); + png_ptr->num_trans = (png_uint_16)num; + } + + if (info_ptr->num_trans > (png_uint_16)num) + { + png_warning(png_ptr, "Truncating incorrect info tRNS chunk length"); + info_ptr->num_trans = (png_uint_16)num; + } + } + } +#endif + +} + +void /* PRIVATE */ +png_handle_IEND(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +{ + png_debug(1, "in png_handle_IEND"); + + if (!(png_ptr->mode & PNG_HAVE_IHDR) || !(png_ptr->mode & PNG_HAVE_IDAT)) + { + png_error(png_ptr, "No image in file"); + } + + png_ptr->mode |= (PNG_AFTER_IDAT | PNG_HAVE_IEND); + + if (length != 0) + { + png_warning(png_ptr, "Incorrect IEND chunk length"); + } + + png_crc_finish(png_ptr, length); + + PNG_UNUSED(info_ptr) /* Quiet compiler warnings about unused info_ptr */ +} + +#ifdef PNG_READ_gAMA_SUPPORTED +void /* PRIVATE */ +png_handle_gAMA(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +{ + png_fixed_point igamma; + png_byte buf[4]; + + png_debug(1, "in png_handle_gAMA"); + + if (!(png_ptr->mode & PNG_HAVE_IHDR)) + png_error(png_ptr, "Missing IHDR before gAMA"); + + else if (png_ptr->mode & PNG_HAVE_IDAT) + { + png_warning(png_ptr, "Invalid gAMA after IDAT"); + png_crc_finish(png_ptr, length); + return; + } + + else if (png_ptr->mode & PNG_HAVE_PLTE) + /* Should be an error, but we can cope with it */ + png_warning(png_ptr, "Out of place gAMA chunk"); + + if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA) +#ifdef PNG_READ_sRGB_SUPPORTED + && !(info_ptr->valid & PNG_INFO_sRGB) +#endif + ) + { + png_warning(png_ptr, "Duplicate gAMA chunk"); + png_crc_finish(png_ptr, length); + return; + } + + if (length != 4) + { + png_warning(png_ptr, "Incorrect gAMA chunk length"); + png_crc_finish(png_ptr, length); + return; + } + + png_crc_read(png_ptr, buf, 4); + + if (png_crc_finish(png_ptr, 0)) + return; + + igamma = png_get_fixed_point(NULL, buf); + + /* Check for zero gamma or an error. */ + if (igamma <= 0) + { + png_warning(png_ptr, + "Ignoring gAMA chunk with out of range gamma"); + + return; + } + +# ifdef PNG_READ_sRGB_SUPPORTED + if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_sRGB)) + { + if (PNG_OUT_OF_RANGE(igamma, 45500L, 500)) + { + png_warning(png_ptr, + "Ignoring incorrect gAMA value when sRGB is also present"); + +# ifdef PNG_CONSOLE_IO_SUPPORTED + fprintf(stderr, "gamma = (%d/100000)", (int)igamma); +# endif + return; + } + } +# endif /* PNG_READ_sRGB_SUPPORTED */ + +# ifdef PNG_READ_GAMMA_SUPPORTED + /* Gamma correction on read is supported. */ + png_ptr->gamma = igamma; +# endif + /* And set the 'info' structure members. */ + png_set_gAMA_fixed(png_ptr, info_ptr, igamma); +} +#endif + +#ifdef PNG_READ_sBIT_SUPPORTED +void /* PRIVATE */ +png_handle_sBIT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +{ + png_size_t truelen; + png_byte buf[4]; + + png_debug(1, "in png_handle_sBIT"); + + buf[0] = buf[1] = buf[2] = buf[3] = 0; + + if (!(png_ptr->mode & PNG_HAVE_IHDR)) + png_error(png_ptr, "Missing IHDR before sBIT"); + + else if (png_ptr->mode & PNG_HAVE_IDAT) + { + png_warning(png_ptr, "Invalid sBIT after IDAT"); + png_crc_finish(png_ptr, length); + return; + } + + else if (png_ptr->mode & PNG_HAVE_PLTE) + { + /* Should be an error, but we can cope with it */ + png_warning(png_ptr, "Out of place sBIT chunk"); + } + + if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_sBIT)) + { + png_warning(png_ptr, "Duplicate sBIT chunk"); + png_crc_finish(png_ptr, length); + return; + } + + if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) + truelen = 3; + + else + truelen = (png_size_t)png_ptr->channels; + + if (length != truelen || length > 4) + { + png_warning(png_ptr, "Incorrect sBIT chunk length"); + png_crc_finish(png_ptr, length); + return; + } + + png_crc_read(png_ptr, buf, truelen); + + if (png_crc_finish(png_ptr, 0)) + return; + + if (png_ptr->color_type & PNG_COLOR_MASK_COLOR) + { + png_ptr->sig_bit.red = buf[0]; + png_ptr->sig_bit.green = buf[1]; + png_ptr->sig_bit.blue = buf[2]; + png_ptr->sig_bit.alpha = buf[3]; + } + + else + { + png_ptr->sig_bit.gray = buf[0]; + png_ptr->sig_bit.red = buf[0]; + png_ptr->sig_bit.green = buf[0]; + png_ptr->sig_bit.blue = buf[0]; + png_ptr->sig_bit.alpha = buf[1]; + } + + png_set_sBIT(png_ptr, info_ptr, &(png_ptr->sig_bit)); +} +#endif + +#ifdef PNG_READ_cHRM_SUPPORTED +void /* PRIVATE */ +png_handle_cHRM(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +{ + png_byte buf[32]; + png_fixed_point x_white, y_white, x_red, y_red, x_green, y_green, x_blue, + y_blue; + + png_debug(1, "in png_handle_cHRM"); + + if (!(png_ptr->mode & PNG_HAVE_IHDR)) + png_error(png_ptr, "Missing IHDR before cHRM"); + + else if (png_ptr->mode & PNG_HAVE_IDAT) + { + png_warning(png_ptr, "Invalid cHRM after IDAT"); + png_crc_finish(png_ptr, length); + return; + } + + else if (png_ptr->mode & PNG_HAVE_PLTE) + /* Should be an error, but we can cope with it */ + png_warning(png_ptr, "Missing PLTE before cHRM"); + + if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM) +# ifdef PNG_READ_sRGB_SUPPORTED + && !(info_ptr->valid & PNG_INFO_sRGB) +# endif + ) + { + png_warning(png_ptr, "Duplicate cHRM chunk"); + png_crc_finish(png_ptr, length); + return; + } + + if (length != 32) + { + png_warning(png_ptr, "Incorrect cHRM chunk length"); + png_crc_finish(png_ptr, length); + return; + } + + png_crc_read(png_ptr, buf, 32); + + if (png_crc_finish(png_ptr, 0)) + return; + + x_white = png_get_fixed_point(NULL, buf); + y_white = png_get_fixed_point(NULL, buf + 4); + x_red = png_get_fixed_point(NULL, buf + 8); + y_red = png_get_fixed_point(NULL, buf + 12); + x_green = png_get_fixed_point(NULL, buf + 16); + y_green = png_get_fixed_point(NULL, buf + 20); + x_blue = png_get_fixed_point(NULL, buf + 24); + y_blue = png_get_fixed_point(NULL, buf + 28); + + if (x_white == PNG_FIXED_ERROR || + y_white == PNG_FIXED_ERROR || + x_red == PNG_FIXED_ERROR || + y_red == PNG_FIXED_ERROR || + x_green == PNG_FIXED_ERROR || + y_green == PNG_FIXED_ERROR || + x_blue == PNG_FIXED_ERROR || + y_blue == PNG_FIXED_ERROR) + { + png_warning(png_ptr, "Ignoring cHRM chunk with negative chromaticities"); + return; + } + +#ifdef PNG_READ_sRGB_SUPPORTED + if ((info_ptr != NULL) && (info_ptr->valid & PNG_INFO_sRGB)) + { + if (PNG_OUT_OF_RANGE(x_white, 31270, 1000) || + PNG_OUT_OF_RANGE(y_white, 32900, 1000) || + PNG_OUT_OF_RANGE(x_red, 64000L, 1000) || + PNG_OUT_OF_RANGE(y_red, 33000, 1000) || + PNG_OUT_OF_RANGE(x_green, 30000, 1000) || + PNG_OUT_OF_RANGE(y_green, 60000L, 1000) || + PNG_OUT_OF_RANGE(x_blue, 15000, 1000) || + PNG_OUT_OF_RANGE(y_blue, 6000, 1000)) + { + png_warning(png_ptr, + "Ignoring incorrect cHRM value when sRGB is also present"); + +#ifdef PNG_CONSOLE_IO_SUPPORTED + fprintf(stderr, "wx=%d, wy=%d, rx=%d, ry=%d\n", + x_white, y_white, x_red, y_red); + + fprintf(stderr, "gx=%d, gy=%d, bx=%d, by=%d\n", + x_green, y_green, x_blue, y_blue); +#endif /* PNG_CONSOLE_IO_SUPPORTED */ + } + return; + } +#endif /* PNG_READ_sRGB_SUPPORTED */ + + png_set_cHRM_fixed(png_ptr, info_ptr, x_white, y_white, x_red, y_red, + x_green, y_green, x_blue, y_blue); +} +#endif + +#ifdef PNG_READ_sRGB_SUPPORTED +void /* PRIVATE */ +png_handle_sRGB(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +{ + int intent; + png_byte buf[1]; + + png_debug(1, "in png_handle_sRGB"); + + if (!(png_ptr->mode & PNG_HAVE_IHDR)) + png_error(png_ptr, "Missing IHDR before sRGB"); + + else if (png_ptr->mode & PNG_HAVE_IDAT) + { + png_warning(png_ptr, "Invalid sRGB after IDAT"); + png_crc_finish(png_ptr, length); + return; + } + + else if (png_ptr->mode & PNG_HAVE_PLTE) + /* Should be an error, but we can cope with it */ + png_warning(png_ptr, "Out of place sRGB chunk"); + + if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_sRGB)) + { + png_warning(png_ptr, "Duplicate sRGB chunk"); + png_crc_finish(png_ptr, length); + return; + } + + if (length != 1) + { + png_warning(png_ptr, "Incorrect sRGB chunk length"); + png_crc_finish(png_ptr, length); + return; + } + + png_crc_read(png_ptr, buf, 1); + + if (png_crc_finish(png_ptr, 0)) + return; + + intent = buf[0]; + + /* Check for bad intent */ + if (intent >= PNG_sRGB_INTENT_LAST) + { + png_warning(png_ptr, "Unknown sRGB intent"); + return; + } + +#if defined(PNG_READ_gAMA_SUPPORTED) && defined(PNG_READ_GAMMA_SUPPORTED) + if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA)) + { + if (PNG_OUT_OF_RANGE(info_ptr->gamma, 45500L, 500)) + { + png_warning(png_ptr, + "Ignoring incorrect gAMA value when sRGB is also present"); +#ifdef PNG_CONSOLE_IO_SUPPORTED + fprintf(stderr, "incorrect gamma=(%d/100000)\n", info_ptr->gamma); +#endif + } + } +#endif /* PNG_READ_gAMA_SUPPORTED */ + +#ifdef PNG_READ_cHRM_SUPPORTED + if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM)) + if (PNG_OUT_OF_RANGE(info_ptr->x_white, 31270, 1000) || + PNG_OUT_OF_RANGE(info_ptr->y_white, 32900, 1000) || + PNG_OUT_OF_RANGE(info_ptr->x_red, 64000L, 1000) || + PNG_OUT_OF_RANGE(info_ptr->y_red, 33000, 1000) || + PNG_OUT_OF_RANGE(info_ptr->x_green, 30000, 1000) || + PNG_OUT_OF_RANGE(info_ptr->y_green, 60000L, 1000) || + PNG_OUT_OF_RANGE(info_ptr->x_blue, 15000, 1000) || + PNG_OUT_OF_RANGE(info_ptr->y_blue, 6000, 1000)) + { + png_warning(png_ptr, + "Ignoring incorrect cHRM value when sRGB is also present"); + } +#endif /* PNG_READ_cHRM_SUPPORTED */ + + png_set_sRGB_gAMA_and_cHRM(png_ptr, info_ptr, intent); +} +#endif /* PNG_READ_sRGB_SUPPORTED */ + +#ifdef PNG_READ_iCCP_SUPPORTED +void /* PRIVATE */ +png_handle_iCCP(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +/* Note: this does not properly handle chunks that are > 64K under DOS */ +{ + png_byte compression_type; + png_bytep pC; + png_charp profile; + png_uint_32 skip = 0; + png_uint_32 profile_size; + png_alloc_size_t profile_length; + png_size_t slength, prefix_length, data_length; + + png_debug(1, "in png_handle_iCCP"); + + if (!(png_ptr->mode & PNG_HAVE_IHDR)) + png_error(png_ptr, "Missing IHDR before iCCP"); + + else if (png_ptr->mode & PNG_HAVE_IDAT) + { + png_warning(png_ptr, "Invalid iCCP after IDAT"); + png_crc_finish(png_ptr, length); + return; + } + + else if (png_ptr->mode & PNG_HAVE_PLTE) + /* Should be an error, but we can cope with it */ + png_warning(png_ptr, "Out of place iCCP chunk"); + + if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_iCCP)) + { + png_warning(png_ptr, "Duplicate iCCP chunk"); + png_crc_finish(png_ptr, length); + return; + } + +#ifdef PNG_MAX_MALLOC_64K + if (length > (png_uint_32)65535L) + { + png_warning(png_ptr, "iCCP chunk too large to fit in memory"); + skip = length - (png_uint_32)65535L; + length = (png_uint_32)65535L; + } +#endif + + png_free(png_ptr, png_ptr->chunkdata); + png_ptr->chunkdata = (png_charp)png_malloc(png_ptr, length + 1); + slength = (png_size_t)length; + png_crc_read(png_ptr, (png_bytep)png_ptr->chunkdata, slength); + + if (png_crc_finish(png_ptr, skip)) + { + png_free(png_ptr, png_ptr->chunkdata); + png_ptr->chunkdata = NULL; + return; + } + + png_ptr->chunkdata[slength] = 0x00; + + for (profile = png_ptr->chunkdata; *profile; profile++) + /* Empty loop to find end of name */ ; + + ++profile; + + /* There should be at least one zero (the compression type byte) + * following the separator, and we should be on it + */ + if (profile >= png_ptr->chunkdata + slength - 1) + { + png_free(png_ptr, png_ptr->chunkdata); + png_ptr->chunkdata = NULL; + png_warning(png_ptr, "Malformed iCCP chunk"); + return; + } + + /* Compression_type should always be zero */ + compression_type = *profile++; + + if (compression_type) + { + png_warning(png_ptr, "Ignoring nonzero compression type in iCCP chunk"); + compression_type = 0x00; /* Reset it to zero (libpng-1.0.6 through 1.0.8 + wrote nonzero) */ + } + + prefix_length = profile - png_ptr->chunkdata; + png_decompress_chunk(png_ptr, compression_type, + slength, prefix_length, &data_length); + + profile_length = data_length - prefix_length; + + if (prefix_length > data_length || profile_length < 4) + { + png_free(png_ptr, png_ptr->chunkdata); + png_ptr->chunkdata = NULL; + png_warning(png_ptr, "Profile size field missing from iCCP chunk"); + return; + } + + /* Check the profile_size recorded in the first 32 bits of the ICC profile */ + pC = (png_bytep)(png_ptr->chunkdata + prefix_length); + profile_size = ((*(pC )) << 24) | + ((*(pC + 1)) << 16) | + ((*(pC + 2)) << 8) | + ((*(pC + 3)) ); + + /* NOTE: the following guarantees that 'profile_length' fits into 32 bits, + * because profile_size is a 32 bit value. + */ + if (profile_size < profile_length) + profile_length = profile_size; + + /* And the following guarantees that profile_size == profile_length. */ + if (profile_size > profile_length) + { + png_free(png_ptr, png_ptr->chunkdata); + png_ptr->chunkdata = NULL; +#ifdef PNG_STDIO_SUPPORTED + { + char umsg[80]; + + png_snprintf2(umsg, 80, + "Ignoring iCCP chunk with declared size = %u " + "and actual length = %u", + (unsigned int) profile_size, + (unsigned int) profile_length); + png_warning(png_ptr, umsg); + } +#else + png_warning(png_ptr, + "Ignoring iCCP chunk with uncompressed size mismatch"); +#endif + return; + } + + png_set_iCCP(png_ptr, info_ptr, png_ptr->chunkdata, + compression_type, (png_bytep)png_ptr->chunkdata + prefix_length, + profile_size); + png_free(png_ptr, png_ptr->chunkdata); + png_ptr->chunkdata = NULL; +} +#endif /* PNG_READ_iCCP_SUPPORTED */ + +#ifdef PNG_READ_sPLT_SUPPORTED +void /* PRIVATE */ +png_handle_sPLT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +/* Note: this does not properly handle chunks that are > 64K under DOS */ +{ + png_bytep entry_start; + png_sPLT_t new_palette; +#ifdef PNG_POINTER_INDEXING_SUPPORTED + png_sPLT_entryp pp; +#endif + png_uint_32 data_length; + int entry_size, i; + png_uint_32 skip = 0; + png_size_t slength; + png_uint_32 dl; + png_size_t max_dl; + + png_debug(1, "in png_handle_sPLT"); + +#ifdef PNG_USER_LIMITS_SUPPORTED + + if (png_ptr->user_chunk_cache_max != 0) + { + if (png_ptr->user_chunk_cache_max == 1) + { + png_crc_finish(png_ptr, length); + return; + } + + if (--png_ptr->user_chunk_cache_max == 1) + { + png_warning(png_ptr, "No space in chunk cache for sPLT"); + png_crc_finish(png_ptr, length); + return; + } + } +#endif + + if (!(png_ptr->mode & PNG_HAVE_IHDR)) + png_error(png_ptr, "Missing IHDR before sPLT"); + + else if (png_ptr->mode & PNG_HAVE_IDAT) + { + png_warning(png_ptr, "Invalid sPLT after IDAT"); + png_crc_finish(png_ptr, length); + return; + } + +#ifdef PNG_MAX_MALLOC_64K + if (length > (png_uint_32)65535L) + { + png_warning(png_ptr, "sPLT chunk too large to fit in memory"); + skip = length - (png_uint_32)65535L; + length = (png_uint_32)65535L; + } +#endif + + png_free(png_ptr, png_ptr->chunkdata); + png_ptr->chunkdata = (png_charp)png_malloc(png_ptr, length + 1); + + /* WARNING: this may break if size_t is less than 32 bits; it is assumed + * that the PNG_MAX_MALLOC_64K test is enabled in this case, but this is a + * potential breakage point if the types in pngconf.h aren't exactly right. + */ + slength = (png_size_t)length; + png_crc_read(png_ptr, (png_bytep)png_ptr->chunkdata, slength); + + if (png_crc_finish(png_ptr, skip)) + { + png_free(png_ptr, png_ptr->chunkdata); + png_ptr->chunkdata = NULL; + return; + } + + png_ptr->chunkdata[slength] = 0x00; + + for (entry_start = (png_bytep)png_ptr->chunkdata; *entry_start; + entry_start++) + /* Empty loop to find end of name */ ; + + ++entry_start; + + /* A sample depth should follow the separator, and we should be on it */ + if (entry_start > (png_bytep)png_ptr->chunkdata + slength - 2) + { + png_free(png_ptr, png_ptr->chunkdata); + png_ptr->chunkdata = NULL; + png_warning(png_ptr, "malformed sPLT chunk"); + return; + } + + new_palette.depth = *entry_start++; + entry_size = (new_palette.depth == 8 ? 6 : 10); + /* This must fit in a png_uint_32 because it is derived from the original + * chunk data length (and use 'length', not 'slength' here for clarity - + * they are guaranteed to be the same, see the tests above.) + */ + data_length = length - (png_uint_32)(entry_start - + (png_bytep)png_ptr->chunkdata); + + /* Integrity-check the data length */ + if (data_length % entry_size) + { + png_free(png_ptr, png_ptr->chunkdata); + png_ptr->chunkdata = NULL; + png_warning(png_ptr, "sPLT chunk has bad length"); + return; + } + + dl = (png_int_32)(data_length / entry_size); + max_dl = PNG_SIZE_MAX / png_sizeof(png_sPLT_entry); + + if (dl > max_dl) + { + png_warning(png_ptr, "sPLT chunk too long"); + return; + } + + new_palette.nentries = (png_int_32)(data_length / entry_size); + + new_palette.entries = (png_sPLT_entryp)png_malloc_warn( + png_ptr, new_palette.nentries * png_sizeof(png_sPLT_entry)); + + if (new_palette.entries == NULL) + { + png_warning(png_ptr, "sPLT chunk requires too much memory"); + return; + } + +#ifdef PNG_POINTER_INDEXING_SUPPORTED + for (i = 0; i < new_palette.nentries; i++) + { + pp = new_palette.entries + i; + + if (new_palette.depth == 8) + { + pp->red = *entry_start++; + pp->green = *entry_start++; + pp->blue = *entry_start++; + pp->alpha = *entry_start++; + } + + else + { + pp->red = png_get_uint_16(entry_start); entry_start += 2; + pp->green = png_get_uint_16(entry_start); entry_start += 2; + pp->blue = png_get_uint_16(entry_start); entry_start += 2; + pp->alpha = png_get_uint_16(entry_start); entry_start += 2; + } + + pp->frequency = png_get_uint_16(entry_start); entry_start += 2; + } +#else + pp = new_palette.entries; + + for (i = 0; i < new_palette.nentries; i++) + { + + if (new_palette.depth == 8) + { + pp[i].red = *entry_start++; + pp[i].green = *entry_start++; + pp[i].blue = *entry_start++; + pp[i].alpha = *entry_start++; + } + + else + { + pp[i].red = png_get_uint_16(entry_start); entry_start += 2; + pp[i].green = png_get_uint_16(entry_start); entry_start += 2; + pp[i].blue = png_get_uint_16(entry_start); entry_start += 2; + pp[i].alpha = png_get_uint_16(entry_start); entry_start += 2; + } + + pp->frequency = png_get_uint_16(entry_start); entry_start += 2; + } +#endif + + /* Discard all chunk data except the name and stash that */ + new_palette.name = png_ptr->chunkdata; + + png_set_sPLT(png_ptr, info_ptr, &new_palette, 1); + + png_free(png_ptr, png_ptr->chunkdata); + png_ptr->chunkdata = NULL; + png_free(png_ptr, new_palette.entries); +} +#endif /* PNG_READ_sPLT_SUPPORTED */ + +#ifdef PNG_READ_tRNS_SUPPORTED +void /* PRIVATE */ +png_handle_tRNS(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +{ + png_byte readbuf[PNG_MAX_PALETTE_LENGTH]; + + png_debug(1, "in png_handle_tRNS"); + + if (!(png_ptr->mode & PNG_HAVE_IHDR)) + png_error(png_ptr, "Missing IHDR before tRNS"); + + else if (png_ptr->mode & PNG_HAVE_IDAT) + { + png_warning(png_ptr, "Invalid tRNS after IDAT"); + png_crc_finish(png_ptr, length); + return; + } + + else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_tRNS)) + { + png_warning(png_ptr, "Duplicate tRNS chunk"); + png_crc_finish(png_ptr, length); + return; + } + + if (png_ptr->color_type == PNG_COLOR_TYPE_GRAY) + { + png_byte buf[2]; + + if (length != 2) + { + png_warning(png_ptr, "Incorrect tRNS chunk length"); + png_crc_finish(png_ptr, length); + return; + } + + png_crc_read(png_ptr, buf, 2); + png_ptr->num_trans = 1; + png_ptr->trans_color.gray = png_get_uint_16(buf); + } + + else if (png_ptr->color_type == PNG_COLOR_TYPE_RGB) + { + png_byte buf[6]; + + if (length != 6) + { + png_warning(png_ptr, "Incorrect tRNS chunk length"); + png_crc_finish(png_ptr, length); + return; + } + + png_crc_read(png_ptr, buf, (png_size_t)length); + png_ptr->num_trans = 1; + png_ptr->trans_color.red = png_get_uint_16(buf); + png_ptr->trans_color.green = png_get_uint_16(buf + 2); + png_ptr->trans_color.blue = png_get_uint_16(buf + 4); + } + + else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) + { + if (!(png_ptr->mode & PNG_HAVE_PLTE)) + { + /* Should be an error, but we can cope with it. */ + png_warning(png_ptr, "Missing PLTE before tRNS"); + } + + if (length > (png_uint_32)png_ptr->num_palette || + length > PNG_MAX_PALETTE_LENGTH) + { + png_warning(png_ptr, "Incorrect tRNS chunk length"); + png_crc_finish(png_ptr, length); + return; + } + + if (length == 0) + { + png_warning(png_ptr, "Zero length tRNS chunk"); + png_crc_finish(png_ptr, length); + return; + } + + png_crc_read(png_ptr, readbuf, (png_size_t)length); + png_ptr->num_trans = (png_uint_16)length; + } + + else + { + png_warning(png_ptr, "tRNS chunk not allowed with alpha channel"); + png_crc_finish(png_ptr, length); + return; + } + + if (png_crc_finish(png_ptr, 0)) + { + png_ptr->num_trans = 0; + return; + } + + png_set_tRNS(png_ptr, info_ptr, readbuf, png_ptr->num_trans, + &(png_ptr->trans_color)); +} +#endif + +#ifdef PNG_READ_bKGD_SUPPORTED +void /* PRIVATE */ +png_handle_bKGD(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +{ + png_size_t truelen; + png_byte buf[6]; + + png_debug(1, "in png_handle_bKGD"); + + if (!(png_ptr->mode & PNG_HAVE_IHDR)) + png_error(png_ptr, "Missing IHDR before bKGD"); + + else if (png_ptr->mode & PNG_HAVE_IDAT) + { + png_warning(png_ptr, "Invalid bKGD after IDAT"); + png_crc_finish(png_ptr, length); + return; + } + + else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE && + !(png_ptr->mode & PNG_HAVE_PLTE)) + { + png_warning(png_ptr, "Missing PLTE before bKGD"); + png_crc_finish(png_ptr, length); + return; + } + + else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_bKGD)) + { + png_warning(png_ptr, "Duplicate bKGD chunk"); + png_crc_finish(png_ptr, length); + return; + } + + if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) + truelen = 1; + + else if (png_ptr->color_type & PNG_COLOR_MASK_COLOR) + truelen = 6; + + else + truelen = 2; + + if (length != truelen) + { + png_warning(png_ptr, "Incorrect bKGD chunk length"); + png_crc_finish(png_ptr, length); + return; + } + + png_crc_read(png_ptr, buf, truelen); + + if (png_crc_finish(png_ptr, 0)) + return; + + /* We convert the index value into RGB components so that we can allow + * arbitrary RGB values for background when we have transparency, and + * so it is easy to determine the RGB values of the background color + * from the info_ptr struct. + */ + if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) + { + png_ptr->background.index = buf[0]; + + if (info_ptr && info_ptr->num_palette) + { + if (buf[0] >= info_ptr->num_palette) + { + png_warning(png_ptr, "Incorrect bKGD chunk index value"); + return; + } + + png_ptr->background.red = + (png_uint_16)png_ptr->palette[buf[0]].red; + + png_ptr->background.green = + (png_uint_16)png_ptr->palette[buf[0]].green; + + png_ptr->background.blue = + (png_uint_16)png_ptr->palette[buf[0]].blue; + } + } + + else if (!(png_ptr->color_type & PNG_COLOR_MASK_COLOR)) /* GRAY */ + { + png_ptr->background.red = + png_ptr->background.green = + png_ptr->background.blue = + png_ptr->background.gray = png_get_uint_16(buf); + } + + else + { + png_ptr->background.red = png_get_uint_16(buf); + png_ptr->background.green = png_get_uint_16(buf + 2); + png_ptr->background.blue = png_get_uint_16(buf + 4); + } + + png_set_bKGD(png_ptr, info_ptr, &(png_ptr->background)); +} +#endif + +#ifdef PNG_READ_hIST_SUPPORTED +void /* PRIVATE */ +png_handle_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +{ + unsigned int num, i; + png_uint_16 readbuf[PNG_MAX_PALETTE_LENGTH]; + + png_debug(1, "in png_handle_hIST"); + + if (!(png_ptr->mode & PNG_HAVE_IHDR)) + png_error(png_ptr, "Missing IHDR before hIST"); + + else if (png_ptr->mode & PNG_HAVE_IDAT) + { + png_warning(png_ptr, "Invalid hIST after IDAT"); + png_crc_finish(png_ptr, length); + return; + } + + else if (!(png_ptr->mode & PNG_HAVE_PLTE)) + { + png_warning(png_ptr, "Missing PLTE before hIST"); + png_crc_finish(png_ptr, length); + return; + } + + else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_hIST)) + { + png_warning(png_ptr, "Duplicate hIST chunk"); + png_crc_finish(png_ptr, length); + return; + } + + num = length / 2 ; + + if (num != (unsigned int)png_ptr->num_palette || num > + (unsigned int)PNG_MAX_PALETTE_LENGTH) + { + png_warning(png_ptr, "Incorrect hIST chunk length"); + png_crc_finish(png_ptr, length); + return; + } + + for (i = 0; i < num; i++) + { + png_byte buf[2]; + + png_crc_read(png_ptr, buf, 2); + readbuf[i] = png_get_uint_16(buf); + } + + if (png_crc_finish(png_ptr, 0)) + return; + + png_set_hIST(png_ptr, info_ptr, readbuf); +} +#endif + +#ifdef PNG_READ_pHYs_SUPPORTED +void /* PRIVATE */ +png_handle_pHYs(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +{ + png_byte buf[9]; + png_uint_32 res_x, res_y; + int unit_type; + + png_debug(1, "in png_handle_pHYs"); + + if (!(png_ptr->mode & PNG_HAVE_IHDR)) + png_error(png_ptr, "Missing IHDR before pHYs"); + + else if (png_ptr->mode & PNG_HAVE_IDAT) + { + png_warning(png_ptr, "Invalid pHYs after IDAT"); + png_crc_finish(png_ptr, length); + return; + } + + else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs)) + { + png_warning(png_ptr, "Duplicate pHYs chunk"); + png_crc_finish(png_ptr, length); + return; + } + + if (length != 9) + { + png_warning(png_ptr, "Incorrect pHYs chunk length"); + png_crc_finish(png_ptr, length); + return; + } + + png_crc_read(png_ptr, buf, 9); + + if (png_crc_finish(png_ptr, 0)) + return; + + res_x = png_get_uint_32(buf); + res_y = png_get_uint_32(buf + 4); + unit_type = buf[8]; + png_set_pHYs(png_ptr, info_ptr, res_x, res_y, unit_type); +} +#endif + +#ifdef PNG_READ_oFFs_SUPPORTED +void /* PRIVATE */ +png_handle_oFFs(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +{ + png_byte buf[9]; + png_int_32 offset_x, offset_y; + int unit_type; + + png_debug(1, "in png_handle_oFFs"); + + if (!(png_ptr->mode & PNG_HAVE_IHDR)) + png_error(png_ptr, "Missing IHDR before oFFs"); + + else if (png_ptr->mode & PNG_HAVE_IDAT) + { + png_warning(png_ptr, "Invalid oFFs after IDAT"); + png_crc_finish(png_ptr, length); + return; + } + + else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs)) + { + png_warning(png_ptr, "Duplicate oFFs chunk"); + png_crc_finish(png_ptr, length); + return; + } + + if (length != 9) + { + png_warning(png_ptr, "Incorrect oFFs chunk length"); + png_crc_finish(png_ptr, length); + return; + } + + png_crc_read(png_ptr, buf, 9); + + if (png_crc_finish(png_ptr, 0)) + return; + + offset_x = png_get_int_32(buf); + offset_y = png_get_int_32(buf + 4); + unit_type = buf[8]; + png_set_oFFs(png_ptr, info_ptr, offset_x, offset_y, unit_type); +} +#endif + +#ifdef PNG_READ_pCAL_SUPPORTED +/* Read the pCAL chunk (described in the PNG Extensions document) */ +void /* PRIVATE */ +png_handle_pCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +{ + png_int_32 X0, X1; + png_byte type, nparams; + png_charp buf, units, endptr; + png_charpp params; + png_size_t slength; + int i; + + png_debug(1, "in png_handle_pCAL"); + + if (!(png_ptr->mode & PNG_HAVE_IHDR)) + png_error(png_ptr, "Missing IHDR before pCAL"); + + else if (png_ptr->mode & PNG_HAVE_IDAT) + { + png_warning(png_ptr, "Invalid pCAL after IDAT"); + png_crc_finish(png_ptr, length); + return; + } + + else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_pCAL)) + { + png_warning(png_ptr, "Duplicate pCAL chunk"); + png_crc_finish(png_ptr, length); + return; + } + + png_debug1(2, "Allocating and reading pCAL chunk data (%u bytes)", + length + 1); + png_free(png_ptr, png_ptr->chunkdata); + png_ptr->chunkdata = (png_charp)png_malloc_warn(png_ptr, length + 1); + + if (png_ptr->chunkdata == NULL) + { + png_warning(png_ptr, "No memory for pCAL purpose"); + return; + } + + slength = (png_size_t)length; + png_crc_read(png_ptr, (png_bytep)png_ptr->chunkdata, slength); + + if (png_crc_finish(png_ptr, 0)) + { + png_free(png_ptr, png_ptr->chunkdata); + png_ptr->chunkdata = NULL; + return; + } + + png_ptr->chunkdata[slength] = 0x00; /* Null terminate the last string */ + + png_debug(3, "Finding end of pCAL purpose string"); + for (buf = png_ptr->chunkdata; *buf; buf++) + /* Empty loop */ ; + + endptr = png_ptr->chunkdata + slength; + + /* We need to have at least 12 bytes after the purpose string + * in order to get the parameter information. + */ + if (endptr <= buf + 12) + { + png_warning(png_ptr, "Invalid pCAL data"); + png_free(png_ptr, png_ptr->chunkdata); + png_ptr->chunkdata = NULL; + return; + } + + png_debug(3, "Reading pCAL X0, X1, type, nparams, and units"); + X0 = png_get_int_32((png_bytep)buf+1); + X1 = png_get_int_32((png_bytep)buf+5); + type = buf[9]; + nparams = buf[10]; + units = buf + 11; + + png_debug(3, "Checking pCAL equation type and number of parameters"); + /* Check that we have the right number of parameters for known + * equation types. + */ + if ((type == PNG_EQUATION_LINEAR && nparams != 2) || + (type == PNG_EQUATION_BASE_E && nparams != 3) || + (type == PNG_EQUATION_ARBITRARY && nparams != 3) || + (type == PNG_EQUATION_HYPERBOLIC && nparams != 4)) + { + png_warning(png_ptr, "Invalid pCAL parameters for equation type"); + png_free(png_ptr, png_ptr->chunkdata); + png_ptr->chunkdata = NULL; + return; + } + + else if (type >= PNG_EQUATION_LAST) + { + png_warning(png_ptr, "Unrecognized equation type for pCAL chunk"); + } + + for (buf = units; *buf; buf++) + /* Empty loop to move past the units string. */ ; + + png_debug(3, "Allocating pCAL parameters array"); + + params = (png_charpp)png_malloc_warn(png_ptr, + (png_size_t)(nparams * png_sizeof(png_charp))); + + if (params == NULL) + { + png_free(png_ptr, png_ptr->chunkdata); + png_ptr->chunkdata = NULL; + png_warning(png_ptr, "No memory for pCAL params"); + return; + } + + /* Get pointers to the start of each parameter string. */ + for (i = 0; i < (int)nparams; i++) + { + buf++; /* Skip the null string terminator from previous parameter. */ + + png_debug1(3, "Reading pCAL parameter %d", i); + + for (params[i] = buf; buf <= endptr && *buf != 0x00; buf++) + /* Empty loop to move past each parameter string */ ; + + /* Make sure we haven't run out of data yet */ + if (buf > endptr) + { + png_warning(png_ptr, "Invalid pCAL data"); + png_free(png_ptr, png_ptr->chunkdata); + png_ptr->chunkdata = NULL; + png_free(png_ptr, params); + return; + } + } + + png_set_pCAL(png_ptr, info_ptr, png_ptr->chunkdata, X0, X1, type, nparams, + units, params); + + png_free(png_ptr, png_ptr->chunkdata); + png_ptr->chunkdata = NULL; + png_free(png_ptr, params); +} +#endif + +#ifdef PNG_READ_sCAL_SUPPORTED +/* Read the sCAL chunk */ +void /* PRIVATE */ +png_handle_sCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +{ + png_size_t slength, i; + int state; + + png_debug(1, "in png_handle_sCAL"); + + if (!(png_ptr->mode & PNG_HAVE_IHDR)) + png_error(png_ptr, "Missing IHDR before sCAL"); + + else if (png_ptr->mode & PNG_HAVE_IDAT) + { + png_warning(png_ptr, "Invalid sCAL after IDAT"); + png_crc_finish(png_ptr, length); + return; + } + + else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_sCAL)) + { + png_warning(png_ptr, "Duplicate sCAL chunk"); + png_crc_finish(png_ptr, length); + return; + } + + png_debug1(2, "Allocating and reading sCAL chunk data (%u bytes)", + length + 1); + + png_ptr->chunkdata = (png_charp)png_malloc_warn(png_ptr, length + 1); + + if (png_ptr->chunkdata == NULL) + { + png_warning(png_ptr, "Out of memory while processing sCAL chunk"); + png_crc_finish(png_ptr, length); + return; + } + + slength = (png_size_t)length; + png_crc_read(png_ptr, (png_bytep)png_ptr->chunkdata, slength); + png_ptr->chunkdata[slength] = 0x00; /* Null terminate the last string */ + + if (png_crc_finish(png_ptr, 0)) + { + png_free(png_ptr, png_ptr->chunkdata); + png_ptr->chunkdata = NULL; + return; + } + + /* Validate the unit. */ + if (png_ptr->chunkdata[0] != 1 && png_ptr->chunkdata[0] != 2) + { + png_warning(png_ptr, "Invalid sCAL ignored: invalid unit"); + png_free(png_ptr, png_ptr->chunkdata); + png_ptr->chunkdata = NULL; + return; + } + + /* Validate the ASCII numbers, need two ASCII numbers separated by + * a '\0' and they need to fit exactly in the chunk data. + */ + i = 0; + state = 0; + + if (png_ptr->chunkdata[1] == 45 /* negative width */ || + !png_check_fp_number(png_ptr->chunkdata, slength, &state, &i) || + i >= slength || png_ptr->chunkdata[i++] != 0) + png_warning(png_ptr, "Invalid sCAL chunk ignored: bad width format"); + + else + { + png_size_t heighti = i; + + if (png_ptr->chunkdata[i] == 45 /* negative height */ || + !png_check_fp_number(png_ptr->chunkdata, slength, &state, &i) || + i != slength) + png_warning(png_ptr, "Invalid sCAL chunk ignored: bad height format"); + + else + /* This is the (only) success case. */ + png_set_sCAL_s(png_ptr, info_ptr, png_ptr->chunkdata[0], + png_ptr->chunkdata+1, png_ptr->chunkdata+heighti); + } + + /* Clean up - just free the temporarily allocated buffer. */ + png_free(png_ptr, png_ptr->chunkdata); + png_ptr->chunkdata = NULL; +} +#endif + +#ifdef PNG_READ_tIME_SUPPORTED +void /* PRIVATE */ +png_handle_tIME(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +{ + png_byte buf[7]; + png_time mod_time; + + png_debug(1, "in png_handle_tIME"); + + if (!(png_ptr->mode & PNG_HAVE_IHDR)) + png_error(png_ptr, "Out of place tIME chunk"); + + else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_tIME)) + { + png_warning(png_ptr, "Duplicate tIME chunk"); + png_crc_finish(png_ptr, length); + return; + } + + if (png_ptr->mode & PNG_HAVE_IDAT) + png_ptr->mode |= PNG_AFTER_IDAT; + + if (length != 7) + { + png_warning(png_ptr, "Incorrect tIME chunk length"); + png_crc_finish(png_ptr, length); + return; + } + + png_crc_read(png_ptr, buf, 7); + + if (png_crc_finish(png_ptr, 0)) + return; + + mod_time.second = buf[6]; + mod_time.minute = buf[5]; + mod_time.hour = buf[4]; + mod_time.day = buf[3]; + mod_time.month = buf[2]; + mod_time.year = png_get_uint_16(buf); + + png_set_tIME(png_ptr, info_ptr, &mod_time); +} +#endif + +#ifdef PNG_READ_tEXt_SUPPORTED +/* Note: this does not properly handle chunks that are > 64K under DOS */ +void /* PRIVATE */ +png_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +{ + png_textp text_ptr; + png_charp key; + png_charp text; + png_uint_32 skip = 0; + png_size_t slength; + int ret; + + png_debug(1, "in png_handle_tEXt"); + +#ifdef PNG_USER_LIMITS_SUPPORTED + if (png_ptr->user_chunk_cache_max != 0) + { + if (png_ptr->user_chunk_cache_max == 1) + { + png_crc_finish(png_ptr, length); + return; + } + + if (--png_ptr->user_chunk_cache_max == 1) + { + png_warning(png_ptr, "No space in chunk cache for tEXt"); + png_crc_finish(png_ptr, length); + return; + } + } +#endif + + if (!(png_ptr->mode & PNG_HAVE_IHDR)) + png_error(png_ptr, "Missing IHDR before tEXt"); + + if (png_ptr->mode & PNG_HAVE_IDAT) + png_ptr->mode |= PNG_AFTER_IDAT; + +#ifdef PNG_MAX_MALLOC_64K + if (length > (png_uint_32)65535L) + { + png_warning(png_ptr, "tEXt chunk too large to fit in memory"); + skip = length - (png_uint_32)65535L; + length = (png_uint_32)65535L; + } +#endif + + png_free(png_ptr, png_ptr->chunkdata); + + png_ptr->chunkdata = (png_charp)png_malloc_warn(png_ptr, length + 1); + + if (png_ptr->chunkdata == NULL) + { + png_warning(png_ptr, "No memory to process text chunk"); + return; + } + + slength = (png_size_t)length; + png_crc_read(png_ptr, (png_bytep)png_ptr->chunkdata, slength); + + if (png_crc_finish(png_ptr, skip)) + { + png_free(png_ptr, png_ptr->chunkdata); + png_ptr->chunkdata = NULL; + return; + } + + key = png_ptr->chunkdata; + + key[slength] = 0x00; + + for (text = key; *text; text++) + /* Empty loop to find end of key */ ; + + if (text != key + slength) + text++; + + text_ptr = (png_textp)png_malloc_warn(png_ptr, + png_sizeof(png_text)); + + if (text_ptr == NULL) + { + png_warning(png_ptr, "Not enough memory to process text chunk"); + png_free(png_ptr, png_ptr->chunkdata); + png_ptr->chunkdata = NULL; + return; + } + + text_ptr->compression = PNG_TEXT_COMPRESSION_NONE; + text_ptr->key = key; + text_ptr->lang = NULL; + text_ptr->lang_key = NULL; + text_ptr->itxt_length = 0; + text_ptr->text = text; + text_ptr->text_length = png_strlen(text); + + ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1); + + png_free(png_ptr, png_ptr->chunkdata); + png_ptr->chunkdata = NULL; + png_free(png_ptr, text_ptr); + + if (ret) + png_warning(png_ptr, "Insufficient memory to process text chunk"); +} +#endif + +#ifdef PNG_READ_zTXt_SUPPORTED +/* Note: this does not correctly handle chunks that are > 64K under DOS */ +void /* PRIVATE */ +png_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +{ + png_textp text_ptr; + png_charp text; + int comp_type; + int ret; + png_size_t slength, prefix_len, data_len; + + png_debug(1, "in png_handle_zTXt"); + +#ifdef PNG_USER_LIMITS_SUPPORTED + if (png_ptr->user_chunk_cache_max != 0) + { + if (png_ptr->user_chunk_cache_max == 1) + { + png_crc_finish(png_ptr, length); + return; + } + + if (--png_ptr->user_chunk_cache_max == 1) + { + png_warning(png_ptr, "No space in chunk cache for zTXt"); + png_crc_finish(png_ptr, length); + return; + } + } +#endif + + if (!(png_ptr->mode & PNG_HAVE_IHDR)) + png_error(png_ptr, "Missing IHDR before zTXt"); + + if (png_ptr->mode & PNG_HAVE_IDAT) + png_ptr->mode |= PNG_AFTER_IDAT; + +#ifdef PNG_MAX_MALLOC_64K + /* We will no doubt have problems with chunks even half this size, but + * there is no hard and fast rule to tell us where to stop. + */ + if (length > (png_uint_32)65535L) + { + png_warning(png_ptr, "zTXt chunk too large to fit in memory"); + png_crc_finish(png_ptr, length); + return; + } +#endif + + png_free(png_ptr, png_ptr->chunkdata); + png_ptr->chunkdata = (png_charp)png_malloc_warn(png_ptr, length + 1); + + if (png_ptr->chunkdata == NULL) + { + png_warning(png_ptr, "Out of memory processing zTXt chunk"); + return; + } + + slength = (png_size_t)length; + png_crc_read(png_ptr, (png_bytep)png_ptr->chunkdata, slength); + + if (png_crc_finish(png_ptr, 0)) + { + png_free(png_ptr, png_ptr->chunkdata); + png_ptr->chunkdata = NULL; + return; + } + + png_ptr->chunkdata[slength] = 0x00; + + for (text = png_ptr->chunkdata; *text; text++) + /* Empty loop */ ; + + /* zTXt must have some text after the chunkdataword */ + if (text >= png_ptr->chunkdata + slength - 2) + { + png_warning(png_ptr, "Truncated zTXt chunk"); + png_free(png_ptr, png_ptr->chunkdata); + png_ptr->chunkdata = NULL; + return; + } + + else + { + comp_type = *(++text); + + if (comp_type != PNG_TEXT_COMPRESSION_zTXt) + { + png_warning(png_ptr, "Unknown compression type in zTXt chunk"); + comp_type = PNG_TEXT_COMPRESSION_zTXt; + } + + text++; /* Skip the compression_method byte */ + } + + prefix_len = text - png_ptr->chunkdata; + + png_decompress_chunk(png_ptr, comp_type, + (png_size_t)length, prefix_len, &data_len); + + text_ptr = (png_textp)png_malloc_warn(png_ptr, + png_sizeof(png_text)); + + if (text_ptr == NULL) + { + png_warning(png_ptr, "Not enough memory to process zTXt chunk"); + png_free(png_ptr, png_ptr->chunkdata); + png_ptr->chunkdata = NULL; + return; + } + + text_ptr->compression = comp_type; + text_ptr->key = png_ptr->chunkdata; + text_ptr->lang = NULL; + text_ptr->lang_key = NULL; + text_ptr->itxt_length = 0; + text_ptr->text = png_ptr->chunkdata + prefix_len; + text_ptr->text_length = data_len; + + ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1); + + png_free(png_ptr, text_ptr); + png_free(png_ptr, png_ptr->chunkdata); + png_ptr->chunkdata = NULL; + + if (ret) + png_error(png_ptr, "Insufficient memory to store zTXt chunk"); +} +#endif + +#ifdef PNG_READ_iTXt_SUPPORTED +/* Note: this does not correctly handle chunks that are > 64K under DOS */ +void /* PRIVATE */ +png_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +{ + png_textp text_ptr; + png_charp key, lang, text, lang_key; + int comp_flag; + int comp_type = 0; + int ret; + png_size_t slength, prefix_len, data_len; + + png_debug(1, "in png_handle_iTXt"); + +#ifdef PNG_USER_LIMITS_SUPPORTED + if (png_ptr->user_chunk_cache_max != 0) + { + if (png_ptr->user_chunk_cache_max == 1) + { + png_crc_finish(png_ptr, length); + return; + } + + if (--png_ptr->user_chunk_cache_max == 1) + { + png_warning(png_ptr, "No space in chunk cache for iTXt"); + png_crc_finish(png_ptr, length); + return; + } + } +#endif + + if (!(png_ptr->mode & PNG_HAVE_IHDR)) + png_error(png_ptr, "Missing IHDR before iTXt"); + + if (png_ptr->mode & PNG_HAVE_IDAT) + png_ptr->mode |= PNG_AFTER_IDAT; + +#ifdef PNG_MAX_MALLOC_64K + /* We will no doubt have problems with chunks even half this size, but + * there is no hard and fast rule to tell us where to stop. + */ + if (length > (png_uint_32)65535L) + { + png_warning(png_ptr, "iTXt chunk too large to fit in memory"); + png_crc_finish(png_ptr, length); + return; + } +#endif + + png_free(png_ptr, png_ptr->chunkdata); + png_ptr->chunkdata = (png_charp)png_malloc_warn(png_ptr, length + 1); + + if (png_ptr->chunkdata == NULL) + { + png_warning(png_ptr, "No memory to process iTXt chunk"); + return; + } + + slength = (png_size_t)length; + png_crc_read(png_ptr, (png_bytep)png_ptr->chunkdata, slength); + + if (png_crc_finish(png_ptr, 0)) + { + png_free(png_ptr, png_ptr->chunkdata); + png_ptr->chunkdata = NULL; + return; + } + + png_ptr->chunkdata[slength] = 0x00; + + for (lang = png_ptr->chunkdata; *lang; lang++) + /* Empty loop */ ; + + lang++; /* Skip NUL separator */ + + /* iTXt must have a language tag (possibly empty), two compression bytes, + * translated keyword (possibly empty), and possibly some text after the + * keyword + */ + + if (lang >= png_ptr->chunkdata + slength - 3) + { + png_warning(png_ptr, "Truncated iTXt chunk"); + png_free(png_ptr, png_ptr->chunkdata); + png_ptr->chunkdata = NULL; + return; + } + + else + { + comp_flag = *lang++; + comp_type = *lang++; + } + + for (lang_key = lang; *lang_key; lang_key++) + /* Empty loop */ ; + + lang_key++; /* Skip NUL separator */ + + if (lang_key >= png_ptr->chunkdata + slength) + { + png_warning(png_ptr, "Truncated iTXt chunk"); + png_free(png_ptr, png_ptr->chunkdata); + png_ptr->chunkdata = NULL; + return; + } + + for (text = lang_key; *text; text++) + /* Empty loop */ ; + + text++; /* Skip NUL separator */ + + if (text >= png_ptr->chunkdata + slength) + { + png_warning(png_ptr, "Malformed iTXt chunk"); + png_free(png_ptr, png_ptr->chunkdata); + png_ptr->chunkdata = NULL; + return; + } + + prefix_len = text - png_ptr->chunkdata; + + key=png_ptr->chunkdata; + + if (comp_flag) + png_decompress_chunk(png_ptr, comp_type, + (size_t)length, prefix_len, &data_len); + + else + data_len = png_strlen(png_ptr->chunkdata + prefix_len); + + text_ptr = (png_textp)png_malloc_warn(png_ptr, + png_sizeof(png_text)); + + if (text_ptr == NULL) + { + png_warning(png_ptr, "Not enough memory to process iTXt chunk"); + png_free(png_ptr, png_ptr->chunkdata); + png_ptr->chunkdata = NULL; + return; + } + + text_ptr->compression = (int)comp_flag + 1; + text_ptr->lang_key = png_ptr->chunkdata + (lang_key - key); + text_ptr->lang = png_ptr->chunkdata + (lang - key); + text_ptr->itxt_length = data_len; + text_ptr->text_length = 0; + text_ptr->key = png_ptr->chunkdata; + text_ptr->text = png_ptr->chunkdata + prefix_len; + + ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1); + + png_free(png_ptr, text_ptr); + png_free(png_ptr, png_ptr->chunkdata); + png_ptr->chunkdata = NULL; + + if (ret) + png_error(png_ptr, "Insufficient memory to store iTXt chunk"); +} +#endif + +/* This function is called when we haven't found a handler for a + * chunk. If there isn't a problem with the chunk itself (ie bad + * chunk name, CRC, or a critical chunk), the chunk is silently ignored + * -- unless the PNG_FLAG_UNKNOWN_CHUNKS_SUPPORTED flag is on in which + * case it will be saved away to be written out later. + */ +void /* PRIVATE */ +png_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +{ + png_uint_32 skip = 0; + + png_debug(1, "in png_handle_unknown"); + +#ifdef PNG_USER_LIMITS_SUPPORTED + if (png_ptr->user_chunk_cache_max != 0) + { + if (png_ptr->user_chunk_cache_max == 1) + { + png_crc_finish(png_ptr, length); + return; + } + + if (--png_ptr->user_chunk_cache_max == 1) + { + png_warning(png_ptr, "No space in chunk cache for unknown chunk"); + png_crc_finish(png_ptr, length); + return; + } + } +#endif + + if (png_ptr->mode & PNG_HAVE_IDAT) + { + PNG_IDAT; + + if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) /* Not an IDAT */ + png_ptr->mode |= PNG_AFTER_IDAT; + } + + if (!(png_ptr->chunk_name[0] & 0x20)) + { +#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED + if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name) != + PNG_HANDLE_CHUNK_ALWAYS +#ifdef PNG_READ_USER_CHUNKS_SUPPORTED + && png_ptr->read_user_chunk_fn == NULL +#endif + ) +#endif + png_chunk_error(png_ptr, "unknown critical chunk"); + } + +#ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED + if ((png_ptr->flags & PNG_FLAG_KEEP_UNKNOWN_CHUNKS) +#ifdef PNG_READ_USER_CHUNKS_SUPPORTED + || (png_ptr->read_user_chunk_fn != NULL) +#endif + ) + { +#ifdef PNG_MAX_MALLOC_64K + if (length > (png_uint_32)65535L) + { + png_warning(png_ptr, "unknown chunk too large to fit in memory"); + skip = length - (png_uint_32)65535L; + length = (png_uint_32)65535L; + } +#endif + + png_memcpy((png_charp)png_ptr->unknown_chunk.name, + (png_charp)png_ptr->chunk_name, + png_sizeof(png_ptr->unknown_chunk.name)); + + png_ptr->unknown_chunk.name[png_sizeof(png_ptr->unknown_chunk.name)-1] + = '\0'; + + png_ptr->unknown_chunk.size = (png_size_t)length; + + if (length == 0) + png_ptr->unknown_chunk.data = NULL; + + else + { + png_ptr->unknown_chunk.data = (png_bytep)png_malloc(png_ptr, length); + png_crc_read(png_ptr, (png_bytep)png_ptr->unknown_chunk.data, length); + } + +#ifdef PNG_READ_USER_CHUNKS_SUPPORTED + if (png_ptr->read_user_chunk_fn != NULL) + { + /* Callback to user unknown chunk handler */ + int ret; + + ret = (*(png_ptr->read_user_chunk_fn)) + (png_ptr, &png_ptr->unknown_chunk); + + if (ret < 0) + png_chunk_error(png_ptr, "error in user chunk"); + + if (ret == 0) + { + if (!(png_ptr->chunk_name[0] & 0x20)) + { +#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED + if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name) != + PNG_HANDLE_CHUNK_ALWAYS) +#endif + png_chunk_error(png_ptr, "unknown critical chunk"); + } + + png_set_unknown_chunks(png_ptr, info_ptr, + &png_ptr->unknown_chunk, 1); + } + } + + else +#endif + png_set_unknown_chunks(png_ptr, info_ptr, &png_ptr->unknown_chunk, 1); + + png_free(png_ptr, png_ptr->unknown_chunk.data); + png_ptr->unknown_chunk.data = NULL; + } + + else +#endif + skip = length; + + png_crc_finish(png_ptr, skip); + +#ifndef PNG_READ_USER_CHUNKS_SUPPORTED + PNG_UNUSED(info_ptr) /* Quiet compiler warnings about unused info_ptr */ +#endif +} + +/* This function is called to verify that a chunk name is valid. + * This function can't have the "critical chunk check" incorporated + * into it, since in the future we will need to be able to call user + * functions to handle unknown critical chunks after we check that + * the chunk name itself is valid. + */ + +#define isnonalpha(c) ((c) < 65 || (c) > 122 || ((c) > 90 && (c) < 97)) + +void /* PRIVATE */ +png_check_chunk_name(png_structp png_ptr, png_const_bytep chunk_name) +{ + png_debug(1, "in png_check_chunk_name"); + if (isnonalpha(chunk_name[0]) || isnonalpha(chunk_name[1]) || + isnonalpha(chunk_name[2]) || isnonalpha(chunk_name[3])) + { + png_chunk_error(png_ptr, "invalid chunk type"); + } +} + +/* Combines the row recently read in with the existing pixels in the + * row. This routine takes care of alpha and transparency if requested. + * This routine also handles the two methods of progressive display + * of interlaced images, depending on the mask value. + * The mask value describes which pixels are to be combined with + * the row. The pattern always repeats every 8 pixels, so just 8 + * bits are needed. A one indicates the pixel is to be combined, + * a zero indicates the pixel is to be skipped. This is in addition + * to any alpha or transparency value associated with the pixel. If + * you want all pixels to be combined, pass 0xff (255) in mask. + */ + +void /* PRIVATE */ +png_combine_row(png_structp png_ptr, png_bytep row, int mask) +{ + png_debug(1, "in png_combine_row"); + + if (mask == 0xff) + { + png_memcpy(row, png_ptr->row_buf + 1, + PNG_ROWBYTES(png_ptr->row_info.pixel_depth, png_ptr->width)); + } + + else + { + switch (png_ptr->row_info.pixel_depth) + { + case 1: + { + png_bytep sp = png_ptr->row_buf + 1; + png_bytep dp = row; + int s_inc, s_start, s_end; + int m = 0x80; + int shift; + png_uint_32 i; + png_uint_32 row_width = png_ptr->width; + +#ifdef PNG_READ_PACKSWAP_SUPPORTED + if (png_ptr->transformations & PNG_PACKSWAP) + { + s_start = 0; + s_end = 7; + s_inc = 1; + } + + else +#endif + { + s_start = 7; + s_end = 0; + s_inc = -1; + } + + shift = s_start; + + for (i = 0; i < row_width; i++) + { + if (m & mask) + { + int value; + + value = (*sp >> shift) & 0x01; + *dp &= (png_byte)((0x7f7f >> (7 - shift)) & 0xff); + *dp |= (png_byte)(value << shift); + } + + if (shift == s_end) + { + shift = s_start; + sp++; + dp++; + } + + else + shift += s_inc; + + if (m == 1) + m = 0x80; + + else + m >>= 1; + } + break; + } + + case 2: + { + png_bytep sp = png_ptr->row_buf + 1; + png_bytep dp = row; + int s_start, s_end, s_inc; + int m = 0x80; + int shift; + png_uint_32 i; + png_uint_32 row_width = png_ptr->width; + int value; + +#ifdef PNG_READ_PACKSWAP_SUPPORTED + if (png_ptr->transformations & PNG_PACKSWAP) + { + s_start = 0; + s_end = 6; + s_inc = 2; + } + + else +#endif + { + s_start = 6; + s_end = 0; + s_inc = -2; + } + + shift = s_start; + + for (i = 0; i < row_width; i++) + { + if (m & mask) + { + value = (*sp >> shift) & 0x03; + *dp &= (png_byte)((0x3f3f >> (6 - shift)) & 0xff); + *dp |= (png_byte)(value << shift); + } + + if (shift == s_end) + { + shift = s_start; + sp++; + dp++; + } + + else + shift += s_inc; + + if (m == 1) + m = 0x80; + + else + m >>= 1; + } + break; + } + + case 4: + { + png_bytep sp = png_ptr->row_buf + 1; + png_bytep dp = row; + int s_start, s_end, s_inc; + int m = 0x80; + int shift; + png_uint_32 i; + png_uint_32 row_width = png_ptr->width; + int value; + +#ifdef PNG_READ_PACKSWAP_SUPPORTED + if (png_ptr->transformations & PNG_PACKSWAP) + { + s_start = 0; + s_end = 4; + s_inc = 4; + } + + else +#endif + { + s_start = 4; + s_end = 0; + s_inc = -4; + } + shift = s_start; + + for (i = 0; i < row_width; i++) + { + if (m & mask) + { + value = (*sp >> shift) & 0xf; + *dp &= (png_byte)((0xf0f >> (4 - shift)) & 0xff); + *dp |= (png_byte)(value << shift); + } + + if (shift == s_end) + { + shift = s_start; + sp++; + dp++; + } + + else + shift += s_inc; + + if (m == 1) + m = 0x80; + + else + m >>= 1; + } + break; + } + + default: + { + png_bytep sp = png_ptr->row_buf + 1; + png_bytep dp = row; + png_size_t pixel_bytes = (png_ptr->row_info.pixel_depth >> 3); + png_uint_32 i; + png_uint_32 row_width = png_ptr->width; + png_byte m = 0x80; + + for (i = 0; i < row_width; i++) + { + if (m & mask) + { + png_memcpy(dp, sp, pixel_bytes); + } + + sp += pixel_bytes; + dp += pixel_bytes; + + if (m == 1) + m = 0x80; + + else + m >>= 1; + } + break; + } + } + } +} + +#ifdef PNG_READ_INTERLACING_SUPPORTED +void /* PRIVATE */ +png_do_read_interlace(png_structp png_ptr) +{ + png_row_infop row_info = &(png_ptr->row_info); + png_bytep row = png_ptr->row_buf + 1; + int pass = png_ptr->pass; + png_uint_32 transformations = png_ptr->transformations; + /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */ + /* Offset to next interlace block */ + PNG_CONST int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1}; + + png_debug(1, "in png_do_read_interlace"); + if (row != NULL && row_info != NULL) + { + png_uint_32 final_width; + + final_width = row_info->width * png_pass_inc[pass]; + + switch (row_info->pixel_depth) + { + case 1: + { + png_bytep sp = row + (png_size_t)((row_info->width - 1) >> 3); + png_bytep dp = row + (png_size_t)((final_width - 1) >> 3); + int sshift, dshift; + int s_start, s_end, s_inc; + int jstop = png_pass_inc[pass]; + png_byte v; + png_uint_32 i; + int j; + +#ifdef PNG_READ_PACKSWAP_SUPPORTED + if (transformations & PNG_PACKSWAP) + { + sshift = (int)((row_info->width + 7) & 0x07); + dshift = (int)((final_width + 7) & 0x07); + s_start = 7; + s_end = 0; + s_inc = -1; + } + + else +#endif + { + sshift = 7 - (int)((row_info->width + 7) & 0x07); + dshift = 7 - (int)((final_width + 7) & 0x07); + s_start = 0; + s_end = 7; + s_inc = 1; + } + + for (i = 0; i < row_info->width; i++) + { + v = (png_byte)((*sp >> sshift) & 0x01); + for (j = 0; j < jstop; j++) + { + *dp &= (png_byte)((0x7f7f >> (7 - dshift)) & 0xff); + *dp |= (png_byte)(v << dshift); + + if (dshift == s_end) + { + dshift = s_start; + dp--; + } + + else + dshift += s_inc; + } + + if (sshift == s_end) + { + sshift = s_start; + sp--; + } + + else + sshift += s_inc; + } + break; + } + + case 2: + { + png_bytep sp = row + (png_uint_32)((row_info->width - 1) >> 2); + png_bytep dp = row + (png_uint_32)((final_width - 1) >> 2); + int sshift, dshift; + int s_start, s_end, s_inc; + int jstop = png_pass_inc[pass]; + png_uint_32 i; + +#ifdef PNG_READ_PACKSWAP_SUPPORTED + if (transformations & PNG_PACKSWAP) + { + sshift = (int)(((row_info->width + 3) & 0x03) << 1); + dshift = (int)(((final_width + 3) & 0x03) << 1); + s_start = 6; + s_end = 0; + s_inc = -2; + } + + else +#endif + { + sshift = (int)((3 - ((row_info->width + 3) & 0x03)) << 1); + dshift = (int)((3 - ((final_width + 3) & 0x03)) << 1); + s_start = 0; + s_end = 6; + s_inc = 2; + } + + for (i = 0; i < row_info->width; i++) + { + png_byte v; + int j; + + v = (png_byte)((*sp >> sshift) & 0x03); + for (j = 0; j < jstop; j++) + { + *dp &= (png_byte)((0x3f3f >> (6 - dshift)) & 0xff); + *dp |= (png_byte)(v << dshift); + + if (dshift == s_end) + { + dshift = s_start; + dp--; + } + + else + dshift += s_inc; + } + + if (sshift == s_end) + { + sshift = s_start; + sp--; + } + + else + sshift += s_inc; + } + break; + } + + case 4: + { + png_bytep sp = row + (png_size_t)((row_info->width - 1) >> 1); + png_bytep dp = row + (png_size_t)((final_width - 1) >> 1); + int sshift, dshift; + int s_start, s_end, s_inc; + png_uint_32 i; + int jstop = png_pass_inc[pass]; + +#ifdef PNG_READ_PACKSWAP_SUPPORTED + if (transformations & PNG_PACKSWAP) + { + sshift = (int)(((row_info->width + 1) & 0x01) << 2); + dshift = (int)(((final_width + 1) & 0x01) << 2); + s_start = 4; + s_end = 0; + s_inc = -4; + } + + else +#endif + { + sshift = (int)((1 - ((row_info->width + 1) & 0x01)) << 2); + dshift = (int)((1 - ((final_width + 1) & 0x01)) << 2); + s_start = 0; + s_end = 4; + s_inc = 4; + } + + for (i = 0; i < row_info->width; i++) + { + png_byte v = (png_byte)((*sp >> sshift) & 0xf); + int j; + + for (j = 0; j < jstop; j++) + { + *dp &= (png_byte)((0xf0f >> (4 - dshift)) & 0xff); + *dp |= (png_byte)(v << dshift); + + if (dshift == s_end) + { + dshift = s_start; + dp--; + } + + else + dshift += s_inc; + } + + if (sshift == s_end) + { + sshift = s_start; + sp--; + } + + else + sshift += s_inc; + } + break; + } + default: + { + png_size_t pixel_bytes = (row_info->pixel_depth >> 3); + + png_bytep sp = row + (png_size_t)(row_info->width - 1) + * pixel_bytes; + + png_bytep dp = row + (png_size_t)(final_width - 1) * pixel_bytes; + + int jstop = png_pass_inc[pass]; + png_uint_32 i; + + for (i = 0; i < row_info->width; i++) + { + png_byte v[8]; + int j; + + png_memcpy(v, sp, pixel_bytes); + + for (j = 0; j < jstop; j++) + { + png_memcpy(dp, v, pixel_bytes); + dp -= pixel_bytes; + } + + sp -= pixel_bytes; + } + break; + } + } + row_info->width = final_width; + row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, final_width); + } +#ifndef PNG_READ_PACKSWAP_SUPPORTED + PNG_UNUSED(transformations) /* Silence compiler warning */ +#endif +} +#endif /* PNG_READ_INTERLACING_SUPPORTED */ + +void /* PRIVATE */ +png_read_filter_row(png_structp png_ptr, png_row_infop row_info, png_bytep row, + png_const_bytep prev_row, int filter) +{ + png_debug(1, "in png_read_filter_row"); + png_debug2(2, "row = %u, filter = %d", png_ptr->row_number, filter); + switch (filter) + { + case PNG_FILTER_VALUE_NONE: + break; + + case PNG_FILTER_VALUE_SUB: + { + png_size_t i; + png_size_t istop = row_info->rowbytes; + unsigned int bpp = (row_info->pixel_depth + 7) >> 3; + png_bytep rp = row + bpp; + png_bytep lp = row; + + for (i = bpp; i < istop; i++) + { + *rp = (png_byte)(((int)(*rp) + (int)(*lp++)) & 0xff); + rp++; + } + break; + } + case PNG_FILTER_VALUE_UP: + { + png_size_t i; + png_size_t istop = row_info->rowbytes; + png_bytep rp = row; + png_const_bytep pp = prev_row; + + for (i = 0; i < istop; i++) + { + *rp = (png_byte)(((int)(*rp) + (int)(*pp++)) & 0xff); + rp++; + } + break; + } + case PNG_FILTER_VALUE_AVG: + { + png_size_t i; + png_bytep rp = row; + png_const_bytep pp = prev_row; + png_bytep lp = row; + unsigned int bpp = (row_info->pixel_depth + 7) >> 3; + png_size_t istop = row_info->rowbytes - bpp; + + for (i = 0; i < bpp; i++) + { + *rp = (png_byte)(((int)(*rp) + + ((int)(*pp++) / 2 )) & 0xff); + + rp++; + } + + for (i = 0; i < istop; i++) + { + *rp = (png_byte)(((int)(*rp) + + (int)(*pp++ + *lp++) / 2 ) & 0xff); + + rp++; + } + break; + } + case PNG_FILTER_VALUE_PAETH: + { + png_size_t i; + png_bytep rp = row; + png_const_bytep pp = prev_row; + png_bytep lp = row; + png_const_bytep cp = prev_row; + unsigned int bpp = (row_info->pixel_depth + 7) >> 3; + png_size_t istop=row_info->rowbytes - bpp; + + for (i = 0; i < bpp; i++) + { + *rp = (png_byte)(((int)(*rp) + (int)(*pp++)) & 0xff); + rp++; + } + + for (i = 0; i < istop; i++) /* Use leftover rp,pp */ + { + int a, b, c, pa, pb, pc, p; + + a = *lp++; + b = *pp++; + c = *cp++; + + p = b - c; + pc = a - c; + +#ifdef PNG_USE_ABS + pa = abs(p); + pb = abs(pc); + pc = abs(p + pc); +#else + pa = p < 0 ? -p : p; + pb = pc < 0 ? -pc : pc; + pc = (p + pc) < 0 ? -(p + pc) : p + pc; +#endif + + /* + if (pa <= pb && pa <= pc) + p = a; + + else if (pb <= pc) + p = b; + + else + p = c; + */ + + p = (pa <= pb && pa <= pc) ? a : (pb <= pc) ? b : c; + + *rp = (png_byte)(((int)(*rp) + p) & 0xff); + rp++; + } + break; + } + default: + png_error(png_ptr, "Ignoring bad adaptive filter type"); + /*NOT REACHED */ + break; + } +} + +#ifdef PNG_SEQUENTIAL_READ_SUPPORTED +void /* PRIVATE */ +png_read_finish_row(png_structp png_ptr) +{ +#ifdef PNG_READ_INTERLACING_SUPPORTED + /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */ + + /* Start of interlace block */ + PNG_CONST int png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0}; + + /* Offset to next interlace block */ + PNG_CONST int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1}; + + /* Start of interlace block in the y direction */ + PNG_CONST int png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1}; + + /* Offset to next interlace block in the y direction */ + PNG_CONST int png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2}; +#endif /* PNG_READ_INTERLACING_SUPPORTED */ + + png_debug(1, "in png_read_finish_row"); + png_ptr->row_number++; + if (png_ptr->row_number < png_ptr->num_rows) + return; + +#ifdef PNG_READ_INTERLACING_SUPPORTED + if (png_ptr->interlaced) + { + png_ptr->row_number = 0; + + png_memset(png_ptr->prev_row, 0, png_ptr->rowbytes + 1); + + do + { + png_ptr->pass++; + + if (png_ptr->pass >= 7) + break; + + png_ptr->iwidth = (png_ptr->width + + png_pass_inc[png_ptr->pass] - 1 - + png_pass_start[png_ptr->pass]) / + png_pass_inc[png_ptr->pass]; + + if (!(png_ptr->transformations & PNG_INTERLACE)) + { + png_ptr->num_rows = (png_ptr->height + + png_pass_yinc[png_ptr->pass] - 1 - + png_pass_ystart[png_ptr->pass]) / + png_pass_yinc[png_ptr->pass]; + } + + else /* if (png_ptr->transformations & PNG_INTERLACE) */ + break; /* libpng deinterlacing sees every row */ + + } while (png_ptr->num_rows == 0 || png_ptr->iwidth == 0); + + if (png_ptr->pass < 7) + return; + } +#endif /* PNG_READ_INTERLACING_SUPPORTED */ + + if (!(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED)) + { + PNG_IDAT; + char extra; + int ret; + + png_ptr->zstream.next_out = (Byte *)&extra; + png_ptr->zstream.avail_out = (uInt)1; + + for (;;) + { + if (!(png_ptr->zstream.avail_in)) + { + while (!png_ptr->idat_size) + { + png_crc_finish(png_ptr, 0); + png_ptr->idat_size = png_read_chunk_header(png_ptr); + if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) + png_error(png_ptr, "Not enough image data"); + } + + png_ptr->zstream.avail_in = (uInt)png_ptr->zbuf_size; + png_ptr->zstream.next_in = png_ptr->zbuf; + + if (png_ptr->zbuf_size > png_ptr->idat_size) + png_ptr->zstream.avail_in = (uInt)png_ptr->idat_size; + + png_crc_read(png_ptr, png_ptr->zbuf, png_ptr->zstream.avail_in); + png_ptr->idat_size -= png_ptr->zstream.avail_in; + } + + ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH); + + if (ret == Z_STREAM_END) + { + if (!(png_ptr->zstream.avail_out) || png_ptr->zstream.avail_in || + png_ptr->idat_size) + png_warning(png_ptr, "Extra compressed data"); + + png_ptr->mode |= PNG_AFTER_IDAT; + png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED; + break; + } + + if (ret != Z_OK) + png_error(png_ptr, png_ptr->zstream.msg ? png_ptr->zstream.msg : + "Decompression Error"); + + if (!(png_ptr->zstream.avail_out)) + { + png_warning(png_ptr, "Extra compressed data"); + png_ptr->mode |= PNG_AFTER_IDAT; + png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED; + break; + } + + } + png_ptr->zstream.avail_out = 0; + } + + if (png_ptr->idat_size || png_ptr->zstream.avail_in) + png_warning(png_ptr, "Extra compression data"); + + inflateReset(&png_ptr->zstream); + + png_ptr->mode |= PNG_AFTER_IDAT; +} +#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */ + +void /* PRIVATE */ +png_read_start_row(png_structp png_ptr) +{ +#ifdef PNG_READ_INTERLACING_SUPPORTED + /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */ + + /* Start of interlace block */ + PNG_CONST int png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0}; + + /* Offset to next interlace block */ + PNG_CONST int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1}; + + /* Start of interlace block in the y direction */ + PNG_CONST int png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1}; + + /* Offset to next interlace block in the y direction */ + PNG_CONST int png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2}; +#endif + + int max_pixel_depth; + png_size_t row_bytes; + + png_debug(1, "in png_read_start_row"); + png_ptr->zstream.avail_in = 0; + png_init_read_transformations(png_ptr); +#ifdef PNG_READ_INTERLACING_SUPPORTED + if (png_ptr->interlaced) + { + if (!(png_ptr->transformations & PNG_INTERLACE)) + png_ptr->num_rows = (png_ptr->height + png_pass_yinc[0] - 1 - + png_pass_ystart[0]) / png_pass_yinc[0]; + + else + png_ptr->num_rows = png_ptr->height; + + png_ptr->iwidth = (png_ptr->width + + png_pass_inc[png_ptr->pass] - 1 - + png_pass_start[png_ptr->pass]) / + png_pass_inc[png_ptr->pass]; + } + + else +#endif /* PNG_READ_INTERLACING_SUPPORTED */ + { + png_ptr->num_rows = png_ptr->height; + png_ptr->iwidth = png_ptr->width; + } + + max_pixel_depth = png_ptr->pixel_depth; + +#ifdef PNG_READ_PACK_SUPPORTED + if ((png_ptr->transformations & PNG_PACK) && png_ptr->bit_depth < 8) + max_pixel_depth = 8; +#endif + +#ifdef PNG_READ_EXPAND_SUPPORTED + if (png_ptr->transformations & PNG_EXPAND) + { + if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) + { + if (png_ptr->num_trans) + max_pixel_depth = 32; + + else + max_pixel_depth = 24; + } + + else if (png_ptr->color_type == PNG_COLOR_TYPE_GRAY) + { + if (max_pixel_depth < 8) + max_pixel_depth = 8; + + if (png_ptr->num_trans) + max_pixel_depth *= 2; + } + + else if (png_ptr->color_type == PNG_COLOR_TYPE_RGB) + { + if (png_ptr->num_trans) + { + max_pixel_depth *= 4; + max_pixel_depth /= 3; + } + } + } +#endif + +#ifdef PNG_READ_FILLER_SUPPORTED + if (png_ptr->transformations & (PNG_FILLER)) + { + if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) + max_pixel_depth = 32; + + else if (png_ptr->color_type == PNG_COLOR_TYPE_GRAY) + { + if (max_pixel_depth <= 8) + max_pixel_depth = 16; + + else + max_pixel_depth = 32; + } + + else if (png_ptr->color_type == PNG_COLOR_TYPE_RGB) + { + if (max_pixel_depth <= 32) + max_pixel_depth = 32; + + else + max_pixel_depth = 64; + } + } +#endif + +#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED + if (png_ptr->transformations & PNG_GRAY_TO_RGB) + { + if ( +#ifdef PNG_READ_EXPAND_SUPPORTED + (png_ptr->num_trans && (png_ptr->transformations & PNG_EXPAND)) || +#endif +#ifdef PNG_READ_FILLER_SUPPORTED + (png_ptr->transformations & (PNG_FILLER)) || +#endif + png_ptr->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) + { + if (max_pixel_depth <= 16) + max_pixel_depth = 32; + + else + max_pixel_depth = 64; + } + + else + { + if (max_pixel_depth <= 8) + { + if (png_ptr->color_type == PNG_COLOR_TYPE_RGB_ALPHA) + max_pixel_depth = 32; + + else + max_pixel_depth = 24; + } + + else if (png_ptr->color_type == PNG_COLOR_TYPE_RGB_ALPHA) + max_pixel_depth = 64; + + else + max_pixel_depth = 48; + } + } +#endif + +#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) && \ +defined(PNG_USER_TRANSFORM_PTR_SUPPORTED) + if (png_ptr->transformations & PNG_USER_TRANSFORM) + { + int user_pixel_depth = png_ptr->user_transform_depth* + png_ptr->user_transform_channels; + + if (user_pixel_depth > max_pixel_depth) + max_pixel_depth=user_pixel_depth; + } +#endif + + /* Align the width on the next larger 8 pixels. Mainly used + * for interlacing + */ + row_bytes = ((png_ptr->width + 7) & ~((png_uint_32)7)); + /* Calculate the maximum bytes needed, adding a byte and a pixel + * for safety's sake + */ + row_bytes = PNG_ROWBYTES(max_pixel_depth, row_bytes) + + 1 + ((max_pixel_depth + 7) >> 3); + +#ifdef PNG_MAX_MALLOC_64K + if (row_bytes > (png_uint_32)65536L) + png_error(png_ptr, "This image requires a row greater than 64KB"); +#endif + + if (row_bytes + 48 > png_ptr->old_big_row_buf_size) + { + png_free(png_ptr, png_ptr->big_row_buf); + + if (png_ptr->interlaced) + png_ptr->big_row_buf = (png_bytep)png_calloc(png_ptr, + row_bytes + 48); + + else + png_ptr->big_row_buf = (png_bytep)png_malloc(png_ptr, + row_bytes + 48); + + png_ptr->old_big_row_buf_size = row_bytes + 48; + +#ifdef PNG_ALIGNED_MEMORY_SUPPORTED + /* Use 16-byte aligned memory for row_buf with at least 16 bytes + * of padding before and after row_buf. + */ + png_ptr->row_buf = png_ptr->big_row_buf + 32 - + (((png_alloc_size_t)png_ptr->big_row_buf + 15) & 0x0F); + + png_ptr->old_big_row_buf_size = row_bytes + 48; +#else + /* Use 32 bytes of padding before and 16 bytes after row_buf. */ + png_ptr->row_buf = png_ptr->big_row_buf + 32; +#endif + png_ptr->old_big_row_buf_size = row_bytes + 48; + } + +#ifdef PNG_MAX_MALLOC_64K + if (png_ptr->rowbytes > 65535) + png_error(png_ptr, "This image requires a row greater than 64KB"); + +#endif + if (png_ptr->rowbytes > (PNG_SIZE_MAX - 1)) + png_error(png_ptr, "Row has too many bytes to allocate in memory"); + + if (png_ptr->rowbytes + 1 > png_ptr->old_prev_row_size) + { + png_free(png_ptr, png_ptr->prev_row); + + png_ptr->prev_row = (png_bytep)png_malloc(png_ptr, png_ptr->rowbytes + 1); + + png_ptr->old_prev_row_size = png_ptr->rowbytes + 1; + } + + png_memset(png_ptr->prev_row, 0, png_ptr->rowbytes + 1); + + png_debug1(3, "width = %u,", png_ptr->width); + png_debug1(3, "height = %u,", png_ptr->height); + png_debug1(3, "iwidth = %u,", png_ptr->iwidth); + png_debug1(3, "num_rows = %u,", png_ptr->num_rows); + png_debug1(3, "rowbytes = %lu,", (unsigned long)png_ptr->rowbytes); + png_debug1(3, "irowbytes = %lu", + (unsigned long)PNG_ROWBYTES(png_ptr->pixel_depth, png_ptr->iwidth) + 1); + + png_ptr->flags |= PNG_FLAG_ROW_INIT; +} +#endif /* PNG_READ_SUPPORTED */ diff --git a/programs/develop/libraries/libpng/pngset.c b/programs/develop/libraries/libpng/pngset.c new file mode 100644 index 0000000000..2cfcf33bdf --- /dev/null +++ b/programs/develop/libraries/libpng/pngset.c @@ -0,0 +1,1225 @@ + +/* pngset.c - storage of image information into info struct + * + * Last changed in libpng 1.5.1 [February 3, 2011] + * Copyright (c) 1998-2011 Glenn Randers-Pehrson + * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) + * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) + * + * This code is released under the libpng license. + * For conditions of distribution and use, see the disclaimer + * and license in png.h + * + * The functions here are used during reads to store data from the file + * into the info struct, and during writes to store application data + * into the info struct for writing into the file. This abstracts the + * info struct and allows us to change the structure in the future. + */ + +#include "pngpriv.h" + +#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) + +#ifdef PNG_bKGD_SUPPORTED +void PNGAPI +png_set_bKGD(png_structp png_ptr, png_infop info_ptr, + png_const_color_16p background) +{ + png_debug1(1, "in %s storage function", "bKGD"); + + if (png_ptr == NULL || info_ptr == NULL) + return; + + png_memcpy(&(info_ptr->background), background, png_sizeof(png_color_16)); + info_ptr->valid |= PNG_INFO_bKGD; +} +#endif + +#ifdef PNG_cHRM_SUPPORTED +void PNGFAPI +png_set_cHRM_fixed(png_structp png_ptr, png_infop info_ptr, + png_fixed_point white_x, png_fixed_point white_y, png_fixed_point red_x, + png_fixed_point red_y, png_fixed_point green_x, png_fixed_point green_y, + png_fixed_point blue_x, png_fixed_point blue_y) +{ + png_debug1(1, "in %s storage function", "cHRM fixed"); + + if (png_ptr == NULL || info_ptr == NULL) + return; + +# ifdef PNG_CHECK_cHRM_SUPPORTED + if (png_check_cHRM_fixed(png_ptr, + white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y)) +# endif + { + info_ptr->x_white = white_x; + info_ptr->y_white = white_y; + info_ptr->x_red = red_x; + info_ptr->y_red = red_y; + info_ptr->x_green = green_x; + info_ptr->y_green = green_y; + info_ptr->x_blue = blue_x; + info_ptr->y_blue = blue_y; + info_ptr->valid |= PNG_INFO_cHRM; + } +} + +# ifdef PNG_FLOATING_POINT_SUPPORTED +void PNGAPI +png_set_cHRM(png_structp png_ptr, png_infop info_ptr, + double white_x, double white_y, double red_x, double red_y, + double green_x, double green_y, double blue_x, double blue_y) +{ + png_set_cHRM_fixed(png_ptr, info_ptr, + png_fixed(png_ptr, white_x, "cHRM White X"), + png_fixed(png_ptr, white_y, "cHRM White Y"), + png_fixed(png_ptr, red_x, "cHRM Red X"), + png_fixed(png_ptr, red_y, "cHRM Red Y"), + png_fixed(png_ptr, green_x, "cHRM Green X"), + png_fixed(png_ptr, green_y, "cHRM Green Y"), + png_fixed(png_ptr, blue_x, "cHRM Blue X"), + png_fixed(png_ptr, blue_y, "cHRM Blue Y")); +} +# endif /* PNG_FLOATING_POINT_SUPPORTED */ + +#endif /* PNG_cHRM_SUPPORTED */ + +#ifdef PNG_gAMA_SUPPORTED +void PNGFAPI +png_set_gAMA_fixed(png_structp png_ptr, png_infop info_ptr, png_fixed_point + file_gamma) +{ + png_debug1(1, "in %s storage function", "gAMA"); + + if (png_ptr == NULL || info_ptr == NULL) + return; + + /* Previously these values were limited, however they must be + * wrong, therefore storing them (and setting PNG_INFO_gAMA) + * must be wrong too. + */ + if (file_gamma > (png_fixed_point)PNG_UINT_31_MAX) + png_warning(png_ptr, "Gamma too large, ignored"); + + else if (file_gamma <= 0) + png_warning(png_ptr, "Negative or zero gamma ignored"); + + else + { + info_ptr->gamma = file_gamma; + info_ptr->valid |= PNG_INFO_gAMA; + } +} + +# ifdef PNG_FLOATING_POINT_SUPPORTED +void PNGAPI +png_set_gAMA(png_structp png_ptr, png_infop info_ptr, double file_gamma) +{ + png_set_gAMA_fixed(png_ptr, info_ptr, png_fixed(png_ptr, file_gamma, + "png_set_gAMA")); +} +# endif +#endif + +#ifdef PNG_hIST_SUPPORTED +void PNGAPI +png_set_hIST(png_structp png_ptr, png_infop info_ptr, png_const_uint_16p hist) +{ + int i; + + png_debug1(1, "in %s storage function", "hIST"); + + if (png_ptr == NULL || info_ptr == NULL) + return; + + if (info_ptr->num_palette == 0 || info_ptr->num_palette + > PNG_MAX_PALETTE_LENGTH) + { + png_warning(png_ptr, + "Invalid palette size, hIST allocation skipped"); + + return; + } + + png_free_data(png_ptr, info_ptr, PNG_FREE_HIST, 0); + + /* Changed from info->num_palette to PNG_MAX_PALETTE_LENGTH in + * version 1.2.1 + */ + png_ptr->hist = (png_uint_16p)png_malloc_warn(png_ptr, + PNG_MAX_PALETTE_LENGTH * png_sizeof(png_uint_16)); + + if (png_ptr->hist == NULL) + { + png_warning(png_ptr, "Insufficient memory for hIST chunk data"); + return; + } + + for (i = 0; i < info_ptr->num_palette; i++) + png_ptr->hist[i] = hist[i]; + + info_ptr->hist = png_ptr->hist; + info_ptr->valid |= PNG_INFO_hIST; + info_ptr->free_me |= PNG_FREE_HIST; +} +#endif + +void PNGAPI +png_set_IHDR(png_structp png_ptr, png_infop info_ptr, + png_uint_32 width, png_uint_32 height, int bit_depth, + int color_type, int interlace_type, int compression_type, + int filter_type) +{ + png_debug1(1, "in %s storage function", "IHDR"); + + if (png_ptr == NULL || info_ptr == NULL) + return; + + info_ptr->width = width; + info_ptr->height = height; + info_ptr->bit_depth = (png_byte)bit_depth; + info_ptr->color_type = (png_byte)color_type; + info_ptr->compression_type = (png_byte)compression_type; + info_ptr->filter_type = (png_byte)filter_type; + info_ptr->interlace_type = (png_byte)interlace_type; + + png_check_IHDR (png_ptr, info_ptr->width, info_ptr->height, + info_ptr->bit_depth, info_ptr->color_type, info_ptr->interlace_type, + info_ptr->compression_type, info_ptr->filter_type); + + if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) + info_ptr->channels = 1; + + else if (info_ptr->color_type & PNG_COLOR_MASK_COLOR) + info_ptr->channels = 3; + + else + info_ptr->channels = 1; + + if (info_ptr->color_type & PNG_COLOR_MASK_ALPHA) + info_ptr->channels++; + + info_ptr->pixel_depth = (png_byte)(info_ptr->channels * info_ptr->bit_depth); + + /* Check for potential overflow */ + if (width > + (PNG_UINT_32_MAX >> 3) /* 8-byte RRGGBBAA pixels */ + - 48 /* bigrowbuf hack */ + - 1 /* filter byte */ + - 7*8 /* rounding of width to multiple of 8 pixels */ + - 8) /* extra max_pixel_depth pad */ + info_ptr->rowbytes = 0; + else + info_ptr->rowbytes = PNG_ROWBYTES(info_ptr->pixel_depth, width); +} + +#ifdef PNG_oFFs_SUPPORTED +void PNGAPI +png_set_oFFs(png_structp png_ptr, png_infop info_ptr, + png_int_32 offset_x, png_int_32 offset_y, int unit_type) +{ + png_debug1(1, "in %s storage function", "oFFs"); + + if (png_ptr == NULL || info_ptr == NULL) + return; + + info_ptr->x_offset = offset_x; + info_ptr->y_offset = offset_y; + info_ptr->offset_unit_type = (png_byte)unit_type; + info_ptr->valid |= PNG_INFO_oFFs; +} +#endif + +#ifdef PNG_pCAL_SUPPORTED +void PNGAPI +png_set_pCAL(png_structp png_ptr, png_infop info_ptr, + png_const_charp purpose, png_int_32 X0, png_int_32 X1, int type, + int nparams, png_const_charp units, png_charpp params) +{ + png_size_t length; + int i; + + png_debug1(1, "in %s storage function", "pCAL"); + + if (png_ptr == NULL || info_ptr == NULL) + return; + + length = png_strlen(purpose) + 1; + png_debug1(3, "allocating purpose for info (%lu bytes)", + (unsigned long)length); + + /* TODO: validate format of calibration name and unit name */ + + /* Check that the type matches the specification. */ + if (type < 0 || type > 3) + png_error(png_ptr, "Invalid pCAL equation type"); + + /* Validate params[nparams] */ + for (i=0; ipcal_purpose = (png_charp)png_malloc_warn(png_ptr, length); + + if (info_ptr->pcal_purpose == NULL) + { + png_warning(png_ptr, "Insufficient memory for pCAL purpose"); + return; + } + + png_memcpy(info_ptr->pcal_purpose, purpose, length); + + png_debug(3, "storing X0, X1, type, and nparams in info"); + info_ptr->pcal_X0 = X0; + info_ptr->pcal_X1 = X1; + info_ptr->pcal_type = (png_byte)type; + info_ptr->pcal_nparams = (png_byte)nparams; + + length = png_strlen(units) + 1; + png_debug1(3, "allocating units for info (%lu bytes)", + (unsigned long)length); + + info_ptr->pcal_units = (png_charp)png_malloc_warn(png_ptr, length); + + if (info_ptr->pcal_units == NULL) + { + png_warning(png_ptr, "Insufficient memory for pCAL units"); + return; + } + + png_memcpy(info_ptr->pcal_units, units, length); + + info_ptr->pcal_params = (png_charpp)png_malloc_warn(png_ptr, + (png_size_t)((nparams + 1) * png_sizeof(png_charp))); + + if (info_ptr->pcal_params == NULL) + { + png_warning(png_ptr, "Insufficient memory for pCAL params"); + return; + } + + png_memset(info_ptr->pcal_params, 0, (nparams + 1) * png_sizeof(png_charp)); + + for (i = 0; i < nparams; i++) + { + length = png_strlen(params[i]) + 1; + png_debug2(3, "allocating parameter %d for info (%lu bytes)", i, + (unsigned long)length); + + info_ptr->pcal_params[i] = (png_charp)png_malloc_warn(png_ptr, length); + + if (info_ptr->pcal_params[i] == NULL) + { + png_warning(png_ptr, "Insufficient memory for pCAL parameter"); + return; + } + + png_memcpy(info_ptr->pcal_params[i], params[i], length); + } + + info_ptr->valid |= PNG_INFO_pCAL; + info_ptr->free_me |= PNG_FREE_PCAL; +} +#endif + +#ifdef PNG_sCAL_SUPPORTED +void PNGAPI +png_set_sCAL_s(png_structp png_ptr, png_infop info_ptr, + int unit, png_const_charp swidth, png_const_charp sheight) +{ + png_size_t lengthw = 0, lengthh = 0; + + png_debug1(1, "in %s storage function", "sCAL"); + + if (png_ptr == NULL || info_ptr == NULL) + return; + + /* Double check the unit (should never get here with an invalid + * unit unless this is an API call.) + */ + if (unit != 1 && unit != 2) + png_error(png_ptr, "Invalid sCAL unit"); + + if (swidth == NULL || (lengthw = png_strlen(swidth)) <= 0 || + swidth[0] == 45 /*'-'*/ || !png_check_fp_string(swidth, lengthw)) + png_error(png_ptr, "Invalid sCAL width"); + + if (sheight == NULL || (lengthh = png_strlen(sheight)) <= 0 || + sheight[0] == 45 /*'-'*/ || !png_check_fp_string(sheight, lengthh)) + png_error(png_ptr, "Invalid sCAL height"); + + info_ptr->scal_unit = (png_byte)unit; + + ++lengthw; + + png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthw); + + info_ptr->scal_s_width = (png_charp)png_malloc_warn(png_ptr, lengthw); + + if (info_ptr->scal_s_width == NULL) + { + png_warning(png_ptr, "Memory allocation failed while processing sCAL"); + return; + } + + png_memcpy(info_ptr->scal_s_width, swidth, lengthw); + + ++lengthh; + + png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthh); + + info_ptr->scal_s_height = (png_charp)png_malloc_warn(png_ptr, lengthh); + + if (info_ptr->scal_s_height == NULL) + { + png_free (png_ptr, info_ptr->scal_s_width); + info_ptr->scal_s_width = NULL; + + png_warning(png_ptr, "Memory allocation failed while processing sCAL"); + return; + } + + png_memcpy(info_ptr->scal_s_height, sheight, lengthh); + + info_ptr->valid |= PNG_INFO_sCAL; + info_ptr->free_me |= PNG_FREE_SCAL; +} + +# ifdef PNG_FLOATING_POINT_SUPPORTED +void PNGAPI +png_set_sCAL(png_structp png_ptr, png_infop info_ptr, int unit, double width, + double height) +{ + png_debug1(1, "in %s storage function", "sCAL"); + + /* Check the arguments. */ + if (width <= 0) + png_warning(png_ptr, "Invalid sCAL width ignored"); + + else if (height <= 0) + png_warning(png_ptr, "Invalid sCAL height ignored"); + + else + { + /* Convert 'width' and 'height' to ASCII. */ + char swidth[PNG_sCAL_MAX_DIGITS+1]; + char sheight[PNG_sCAL_MAX_DIGITS+1]; + + png_ascii_from_fp(png_ptr, swidth, sizeof swidth, width, + PNG_sCAL_PRECISION); + png_ascii_from_fp(png_ptr, sheight, sizeof sheight, height, + PNG_sCAL_PRECISION); + + png_set_sCAL_s(png_ptr, info_ptr, unit, swidth, sheight); + } +} +# endif + +# ifdef PNG_FIXED_POINT_SUPPORTED +void PNGAPI +png_set_sCAL_fixed(png_structp png_ptr, png_infop info_ptr, int unit, + png_fixed_point width, png_fixed_point height) +{ + png_debug1(1, "in %s storage function", "sCAL"); + + /* Check the arguments. */ + if (width <= 0) + png_warning(png_ptr, "Invalid sCAL width ignored"); + + else if (height <= 0) + png_warning(png_ptr, "Invalid sCAL height ignored"); + + else + { + /* Convert 'width' and 'height' to ASCII. */ + char swidth[PNG_sCAL_MAX_DIGITS+1]; + char sheight[PNG_sCAL_MAX_DIGITS+1]; + + png_ascii_from_fixed(png_ptr, swidth, sizeof swidth, width); + png_ascii_from_fixed(png_ptr, sheight, sizeof sheight, height); + + png_set_sCAL_s(png_ptr, info_ptr, unit, swidth, sheight); + } +} +# endif +#endif + +#ifdef PNG_pHYs_SUPPORTED +void PNGAPI +png_set_pHYs(png_structp png_ptr, png_infop info_ptr, + png_uint_32 res_x, png_uint_32 res_y, int unit_type) +{ + png_debug1(1, "in %s storage function", "pHYs"); + + if (png_ptr == NULL || info_ptr == NULL) + return; + + info_ptr->x_pixels_per_unit = res_x; + info_ptr->y_pixels_per_unit = res_y; + info_ptr->phys_unit_type = (png_byte)unit_type; + info_ptr->valid |= PNG_INFO_pHYs; +} +#endif + +void PNGAPI +png_set_PLTE(png_structp png_ptr, png_infop info_ptr, + png_const_colorp palette, int num_palette) +{ + + png_debug1(1, "in %s storage function", "PLTE"); + + if (png_ptr == NULL || info_ptr == NULL) + return; + + if (num_palette < 0 || num_palette > PNG_MAX_PALETTE_LENGTH) + { + if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) + png_error(png_ptr, "Invalid palette length"); + + else + { + png_warning(png_ptr, "Invalid palette length"); + return; + } + } + + /* It may not actually be necessary to set png_ptr->palette here; + * we do it for backward compatibility with the way the png_handle_tRNS + * function used to do the allocation. + */ + png_free_data(png_ptr, info_ptr, PNG_FREE_PLTE, 0); + + /* Changed in libpng-1.2.1 to allocate PNG_MAX_PALETTE_LENGTH instead + * of num_palette entries, in case of an invalid PNG file that has + * too-large sample values. + */ + png_ptr->palette = (png_colorp)png_calloc(png_ptr, + PNG_MAX_PALETTE_LENGTH * png_sizeof(png_color)); + + png_memcpy(png_ptr->palette, palette, num_palette * png_sizeof(png_color)); + info_ptr->palette = png_ptr->palette; + info_ptr->num_palette = png_ptr->num_palette = (png_uint_16)num_palette; + + info_ptr->free_me |= PNG_FREE_PLTE; + + info_ptr->valid |= PNG_INFO_PLTE; +} + +#ifdef PNG_sBIT_SUPPORTED +void PNGAPI +png_set_sBIT(png_structp png_ptr, png_infop info_ptr, + png_const_color_8p sig_bit) +{ + png_debug1(1, "in %s storage function", "sBIT"); + + if (png_ptr == NULL || info_ptr == NULL) + return; + + png_memcpy(&(info_ptr->sig_bit), sig_bit, png_sizeof(png_color_8)); + info_ptr->valid |= PNG_INFO_sBIT; +} +#endif + +#ifdef PNG_sRGB_SUPPORTED +void PNGAPI +png_set_sRGB(png_structp png_ptr, png_infop info_ptr, int srgb_intent) +{ + png_debug1(1, "in %s storage function", "sRGB"); + + if (png_ptr == NULL || info_ptr == NULL) + return; + + info_ptr->srgb_intent = (png_byte)srgb_intent; + info_ptr->valid |= PNG_INFO_sRGB; +} + +void PNGAPI +png_set_sRGB_gAMA_and_cHRM(png_structp png_ptr, png_infop info_ptr, + int srgb_intent) +{ + png_debug1(1, "in %s storage function", "sRGB_gAMA_and_cHRM"); + + if (png_ptr == NULL || info_ptr == NULL) + return; + + png_set_sRGB(png_ptr, info_ptr, srgb_intent); + +# ifdef PNG_gAMA_SUPPORTED + png_set_gAMA_fixed(png_ptr, info_ptr, 45455L); +# endif + +# ifdef PNG_cHRM_SUPPORTED + png_set_cHRM_fixed(png_ptr, info_ptr, + /* color x y */ + /* white */ 31270L, 32900L, + /* red */ 64000L, 33000L, + /* green */ 30000L, 60000L, + /* blue */ 15000L, 6000L + ); +# endif /* cHRM */ +} +#endif /* sRGB */ + + +#ifdef PNG_iCCP_SUPPORTED +void PNGAPI +png_set_iCCP(png_structp png_ptr, png_infop info_ptr, + png_const_charp name, int compression_type, + png_const_bytep profile, png_uint_32 proflen) +{ + png_charp new_iccp_name; + png_bytep new_iccp_profile; + png_uint_32 length; + + png_debug1(1, "in %s storage function", "iCCP"); + + if (png_ptr == NULL || info_ptr == NULL || name == NULL || profile == NULL) + return; + + length = png_strlen(name)+1; + new_iccp_name = (png_charp)png_malloc_warn(png_ptr, length); + + if (new_iccp_name == NULL) + { + png_warning(png_ptr, "Insufficient memory to process iCCP chunk"); + return; + } + + png_memcpy(new_iccp_name, name, length); + new_iccp_profile = (png_bytep)png_malloc_warn(png_ptr, proflen); + + if (new_iccp_profile == NULL) + { + png_free (png_ptr, new_iccp_name); + png_warning(png_ptr, + "Insufficient memory to process iCCP profile"); + return; + } + + png_memcpy(new_iccp_profile, profile, (png_size_t)proflen); + + png_free_data(png_ptr, info_ptr, PNG_FREE_ICCP, 0); + + info_ptr->iccp_proflen = proflen; + info_ptr->iccp_name = new_iccp_name; + info_ptr->iccp_profile = new_iccp_profile; + /* Compression is always zero but is here so the API and info structure + * does not have to change if we introduce multiple compression types + */ + info_ptr->iccp_compression = (png_byte)compression_type; + info_ptr->free_me |= PNG_FREE_ICCP; + info_ptr->valid |= PNG_INFO_iCCP; +} +#endif + +#ifdef PNG_TEXT_SUPPORTED +void PNGAPI +png_set_text(png_structp png_ptr, png_infop info_ptr, png_const_textp text_ptr, + int num_text) +{ + int ret; + ret = png_set_text_2(png_ptr, info_ptr, text_ptr, num_text); + + if (ret) + png_error(png_ptr, "Insufficient memory to store text"); +} + +int /* PRIVATE */ +png_set_text_2(png_structp png_ptr, png_infop info_ptr, + png_const_textp text_ptr, int num_text) +{ + int i; + + png_debug1(1, "in %s storage function", ((png_ptr == NULL || + png_ptr->chunk_name[0] == '\0') ? + "text" : (png_const_charp)png_ptr->chunk_name)); + + if (png_ptr == NULL || info_ptr == NULL || num_text == 0) + return(0); + + /* Make sure we have enough space in the "text" array in info_struct + * to hold all of the incoming text_ptr objects. + */ + if (info_ptr->num_text + num_text > info_ptr->max_text) + { + if (info_ptr->text != NULL) + { + png_textp old_text; + int old_max; + + old_max = info_ptr->max_text; + info_ptr->max_text = info_ptr->num_text + num_text + 8; + old_text = info_ptr->text; + info_ptr->text = (png_textp)png_malloc_warn(png_ptr, + (png_size_t)(info_ptr->max_text * png_sizeof(png_text))); + + if (info_ptr->text == NULL) + { + png_free(png_ptr, old_text); + return(1); + } + + png_memcpy(info_ptr->text, old_text, (png_size_t)(old_max * + png_sizeof(png_text))); + png_free(png_ptr, old_text); + } + + else + { + info_ptr->max_text = num_text + 8; + info_ptr->num_text = 0; + info_ptr->text = (png_textp)png_malloc_warn(png_ptr, + (png_size_t)(info_ptr->max_text * png_sizeof(png_text))); + if (info_ptr->text == NULL) + return(1); + info_ptr->free_me |= PNG_FREE_TEXT; + } + + png_debug1(3, "allocated %d entries for info_ptr->text", + info_ptr->max_text); + } + for (i = 0; i < num_text; i++) + { + png_size_t text_length, key_len; + png_size_t lang_len, lang_key_len; + png_textp textp = &(info_ptr->text[info_ptr->num_text]); + + if (text_ptr[i].key == NULL) + continue; + + if (text_ptr[i].compression < PNG_TEXT_COMPRESSION_NONE || + text_ptr[i].compression >= PNG_TEXT_COMPRESSION_LAST) + { + png_warning(png_ptr, "text compression mode is out of range"); + continue; + } + + key_len = png_strlen(text_ptr[i].key); + + if (text_ptr[i].compression <= 0) + { + lang_len = 0; + lang_key_len = 0; + } + + else +# ifdef PNG_iTXt_SUPPORTED + { + /* Set iTXt data */ + + if (text_ptr[i].lang != NULL) + lang_len = png_strlen(text_ptr[i].lang); + + else + lang_len = 0; + + if (text_ptr[i].lang_key != NULL) + lang_key_len = png_strlen(text_ptr[i].lang_key); + + else + lang_key_len = 0; + } +# else /* PNG_iTXt_SUPPORTED */ + { + png_warning(png_ptr, "iTXt chunk not supported"); + continue; + } +# endif + + if (text_ptr[i].text == NULL || text_ptr[i].text[0] == '\0') + { + text_length = 0; +# ifdef PNG_iTXt_SUPPORTED + if (text_ptr[i].compression > 0) + textp->compression = PNG_ITXT_COMPRESSION_NONE; + + else +# endif + textp->compression = PNG_TEXT_COMPRESSION_NONE; + } + + else + { + text_length = png_strlen(text_ptr[i].text); + textp->compression = text_ptr[i].compression; + } + + textp->key = (png_charp)png_malloc_warn(png_ptr, + (png_size_t) + (key_len + text_length + lang_len + lang_key_len + 4)); + + if (textp->key == NULL) + return(1); + + png_debug2(2, "Allocated %lu bytes at %p in png_set_text", + (unsigned long)(png_uint_32) + (key_len + lang_len + lang_key_len + text_length + 4), + textp->key); + + png_memcpy(textp->key, text_ptr[i].key,(png_size_t)(key_len)); + *(textp->key + key_len) = '\0'; + + if (text_ptr[i].compression > 0) + { + textp->lang = textp->key + key_len + 1; + png_memcpy(textp->lang, text_ptr[i].lang, lang_len); + *(textp->lang + lang_len) = '\0'; + textp->lang_key = textp->lang + lang_len + 1; + png_memcpy(textp->lang_key, text_ptr[i].lang_key, lang_key_len); + *(textp->lang_key + lang_key_len) = '\0'; + textp->text = textp->lang_key + lang_key_len + 1; + } + + else + { + textp->lang=NULL; + textp->lang_key=NULL; + textp->text = textp->key + key_len + 1; + } + + if (text_length) + png_memcpy(textp->text, text_ptr[i].text, + (png_size_t)(text_length)); + + *(textp->text + text_length) = '\0'; + +# ifdef PNG_iTXt_SUPPORTED + if (textp->compression > 0) + { + textp->text_length = 0; + textp->itxt_length = text_length; + } + + else +# endif + { + textp->text_length = text_length; + textp->itxt_length = 0; + } + + info_ptr->num_text++; + png_debug1(3, "transferred text chunk %d", info_ptr->num_text); + } + return(0); +} +#endif + +#ifdef PNG_tIME_SUPPORTED +void PNGAPI +png_set_tIME(png_structp png_ptr, png_infop info_ptr, png_const_timep mod_time) +{ + png_debug1(1, "in %s storage function", "tIME"); + + if (png_ptr == NULL || info_ptr == NULL || + (png_ptr->mode & PNG_WROTE_tIME)) + return; + + png_memcpy(&(info_ptr->mod_time), mod_time, png_sizeof(png_time)); + info_ptr->valid |= PNG_INFO_tIME; +} +#endif + +#ifdef PNG_tRNS_SUPPORTED +void PNGAPI +png_set_tRNS(png_structp png_ptr, png_infop info_ptr, + png_const_bytep trans_alpha, int num_trans, png_const_color_16p trans_color) +{ + png_debug1(1, "in %s storage function", "tRNS"); + + if (png_ptr == NULL || info_ptr == NULL) + return; + + if (trans_alpha != NULL) + { + /* It may not actually be necessary to set png_ptr->trans_alpha here; + * we do it for backward compatibility with the way the png_handle_tRNS + * function used to do the allocation. + */ + + png_free_data(png_ptr, info_ptr, PNG_FREE_TRNS, 0); + + /* Changed from num_trans to PNG_MAX_PALETTE_LENGTH in version 1.2.1 */ + png_ptr->trans_alpha = info_ptr->trans_alpha = + (png_bytep)png_malloc(png_ptr, (png_size_t)PNG_MAX_PALETTE_LENGTH); + + if (num_trans > 0 && num_trans <= PNG_MAX_PALETTE_LENGTH) + png_memcpy(info_ptr->trans_alpha, trans_alpha, (png_size_t)num_trans); + } + + if (trans_color != NULL) + { + int sample_max = (1 << info_ptr->bit_depth); + + if ((info_ptr->color_type == PNG_COLOR_TYPE_GRAY && + (int)trans_color->gray > sample_max) || + (info_ptr->color_type == PNG_COLOR_TYPE_RGB && + ((int)trans_color->red > sample_max || + (int)trans_color->green > sample_max || + (int)trans_color->blue > sample_max))) + png_warning(png_ptr, + "tRNS chunk has out-of-range samples for bit_depth"); + + png_memcpy(&(info_ptr->trans_color), trans_color, + png_sizeof(png_color_16)); + + if (num_trans == 0) + num_trans = 1; + } + + info_ptr->num_trans = (png_uint_16)num_trans; + + if (num_trans != 0) + { + info_ptr->valid |= PNG_INFO_tRNS; + info_ptr->free_me |= PNG_FREE_TRNS; + } +} +#endif + +#ifdef PNG_sPLT_SUPPORTED +void PNGAPI +png_set_sPLT(png_structp png_ptr, + png_infop info_ptr, png_const_sPLT_tp entries, int nentries) +/* + * entries - array of png_sPLT_t structures + * to be added to the list of palettes + * in the info structure. + * + * nentries - number of palette structures to be + * added. + */ +{ + png_sPLT_tp np; + int i; + + if (png_ptr == NULL || info_ptr == NULL) + return; + + np = (png_sPLT_tp)png_malloc_warn(png_ptr, + (info_ptr->splt_palettes_num + nentries) * + (png_size_t)png_sizeof(png_sPLT_t)); + + if (np == NULL) + { + png_warning(png_ptr, "No memory for sPLT palettes"); + return; + } + + png_memcpy(np, info_ptr->splt_palettes, + info_ptr->splt_palettes_num * png_sizeof(png_sPLT_t)); + + png_free(png_ptr, info_ptr->splt_palettes); + info_ptr->splt_palettes=NULL; + + for (i = 0; i < nentries; i++) + { + png_sPLT_tp to = np + info_ptr->splt_palettes_num + i; + png_const_sPLT_tp from = entries + i; + png_uint_32 length; + + length = png_strlen(from->name) + 1; + to->name = (png_charp)png_malloc_warn(png_ptr, (png_size_t)length); + + if (to->name == NULL) + { + png_warning(png_ptr, + "Out of memory while processing sPLT chunk"); + continue; + } + + png_memcpy(to->name, from->name, length); + to->entries = (png_sPLT_entryp)png_malloc_warn(png_ptr, + (png_size_t)(from->nentries * png_sizeof(png_sPLT_entry))); + + if (to->entries == NULL) + { + png_warning(png_ptr, + "Out of memory while processing sPLT chunk"); + png_free(png_ptr, to->name); + to->name = NULL; + continue; + } + + png_memcpy(to->entries, from->entries, + from->nentries * png_sizeof(png_sPLT_entry)); + + to->nentries = from->nentries; + to->depth = from->depth; + } + + info_ptr->splt_palettes = np; + info_ptr->splt_palettes_num += nentries; + info_ptr->valid |= PNG_INFO_sPLT; + info_ptr->free_me |= PNG_FREE_SPLT; +} +#endif /* PNG_sPLT_SUPPORTED */ + +#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED +void PNGAPI +png_set_unknown_chunks(png_structp png_ptr, + png_infop info_ptr, png_const_unknown_chunkp unknowns, int num_unknowns) +{ + png_unknown_chunkp np; + int i; + + if (png_ptr == NULL || info_ptr == NULL || num_unknowns == 0) + return; + + np = (png_unknown_chunkp)png_malloc_warn(png_ptr, + (png_size_t)(info_ptr->unknown_chunks_num + num_unknowns) * + png_sizeof(png_unknown_chunk)); + + if (np == NULL) + { + png_warning(png_ptr, + "Out of memory while processing unknown chunk"); + return; + } + + png_memcpy(np, info_ptr->unknown_chunks, + (png_size_t)info_ptr->unknown_chunks_num * + png_sizeof(png_unknown_chunk)); + + png_free(png_ptr, info_ptr->unknown_chunks); + info_ptr->unknown_chunks = NULL; + + for (i = 0; i < num_unknowns; i++) + { + png_unknown_chunkp to = np + info_ptr->unknown_chunks_num + i; + png_const_unknown_chunkp from = unknowns + i; + + png_memcpy(to->name, from->name, png_sizeof(from->name)); + to->name[png_sizeof(to->name)-1] = '\0'; + to->size = from->size; + + /* Note our location in the read or write sequence */ + to->location = (png_byte)(png_ptr->mode & 0xff); + + if (from->size == 0) + to->data=NULL; + + else + { + to->data = (png_bytep)png_malloc_warn(png_ptr, + (png_size_t)from->size); + + if (to->data == NULL) + { + png_warning(png_ptr, + "Out of memory while processing unknown chunk"); + to->size = 0; + } + + else + png_memcpy(to->data, from->data, from->size); + } + } + + info_ptr->unknown_chunks = np; + info_ptr->unknown_chunks_num += num_unknowns; + info_ptr->free_me |= PNG_FREE_UNKN; +} + +void PNGAPI +png_set_unknown_chunk_location(png_structp png_ptr, png_infop info_ptr, + int chunk, int location) +{ + if (png_ptr != NULL && info_ptr != NULL && chunk >= 0 && chunk < + info_ptr->unknown_chunks_num) + info_ptr->unknown_chunks[chunk].location = (png_byte)location; +} +#endif + + +#ifdef PNG_MNG_FEATURES_SUPPORTED +png_uint_32 PNGAPI +png_permit_mng_features (png_structp png_ptr, png_uint_32 mng_features) +{ + png_debug(1, "in png_permit_mng_features"); + + if (png_ptr == NULL) + return (png_uint_32)0; + + png_ptr->mng_features_permitted = + (png_byte)(mng_features & PNG_ALL_MNG_FEATURES); + + return (png_uint_32)png_ptr->mng_features_permitted; +} +#endif + +#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED +void PNGAPI +png_set_keep_unknown_chunks(png_structp png_ptr, int keep, png_const_bytep + chunk_list, int num_chunks) +{ + png_bytep new_list, p; + int i, old_num_chunks; + if (png_ptr == NULL) + return; + + if (num_chunks == 0) + { + if (keep == PNG_HANDLE_CHUNK_ALWAYS || keep == PNG_HANDLE_CHUNK_IF_SAFE) + png_ptr->flags |= PNG_FLAG_KEEP_UNKNOWN_CHUNKS; + + else + png_ptr->flags &= ~PNG_FLAG_KEEP_UNKNOWN_CHUNKS; + + if (keep == PNG_HANDLE_CHUNK_ALWAYS) + png_ptr->flags |= PNG_FLAG_KEEP_UNSAFE_CHUNKS; + + else + png_ptr->flags &= ~PNG_FLAG_KEEP_UNSAFE_CHUNKS; + + return; + } + + if (chunk_list == NULL) + return; + + old_num_chunks = png_ptr->num_chunk_list; + new_list=(png_bytep)png_malloc(png_ptr, + (png_size_t)(5*(num_chunks + old_num_chunks))); + + if (png_ptr->chunk_list != NULL) + { + png_memcpy(new_list, png_ptr->chunk_list, + (png_size_t)(5*old_num_chunks)); + png_free(png_ptr, png_ptr->chunk_list); + png_ptr->chunk_list=NULL; + } + + png_memcpy(new_list + 5*old_num_chunks, chunk_list, + (png_size_t)(5*num_chunks)); + + for (p = new_list + 5*old_num_chunks + 4, i = 0; inum_chunk_list = old_num_chunks + num_chunks; + png_ptr->chunk_list = new_list; + png_ptr->free_me |= PNG_FREE_LIST; +} +#endif + +#ifdef PNG_READ_USER_CHUNKS_SUPPORTED +void PNGAPI +png_set_read_user_chunk_fn(png_structp png_ptr, png_voidp user_chunk_ptr, + png_user_chunk_ptr read_user_chunk_fn) +{ + png_debug(1, "in png_set_read_user_chunk_fn"); + + if (png_ptr == NULL) + return; + + png_ptr->read_user_chunk_fn = read_user_chunk_fn; + png_ptr->user_chunk_ptr = user_chunk_ptr; +} +#endif + +#ifdef PNG_INFO_IMAGE_SUPPORTED +void PNGAPI +png_set_rows(png_structp png_ptr, png_infop info_ptr, png_bytepp row_pointers) +{ + png_debug1(1, "in %s storage function", "rows"); + + if (png_ptr == NULL || info_ptr == NULL) + return; + + if (info_ptr->row_pointers && (info_ptr->row_pointers != row_pointers)) + png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0); + + info_ptr->row_pointers = row_pointers; + + if (row_pointers) + info_ptr->valid |= PNG_INFO_IDAT; +} +#endif + +void PNGAPI +png_set_compression_buffer_size(png_structp png_ptr, png_size_t size) +{ + if (png_ptr == NULL) + return; + + png_free(png_ptr, png_ptr->zbuf); + + if (size > ZLIB_IO_MAX) + { + png_warning(png_ptr, "Attempt to set buffer size beyond max ignored"); + png_ptr->zbuf_size = ZLIB_IO_MAX; + size = ZLIB_IO_MAX; /* must fit */ + } + + else + png_ptr->zbuf_size = (uInt)size; + + png_ptr->zbuf = (png_bytep)png_malloc(png_ptr, size); + + /* The following ensures a relatively safe failure if this gets called while + * the buffer is actually in use. + */ + png_ptr->zstream.next_out = png_ptr->zbuf; + png_ptr->zstream.avail_out = 0; + png_ptr->zstream.avail_in = 0; +} + +void PNGAPI +png_set_invalid(png_structp png_ptr, png_infop info_ptr, int mask) +{ + if (png_ptr && info_ptr) + info_ptr->valid &= ~mask; +} + + + +#ifdef PNG_SET_USER_LIMITS_SUPPORTED +/* This function was added to libpng 1.2.6 */ +void PNGAPI +png_set_user_limits (png_structp png_ptr, png_uint_32 user_width_max, + png_uint_32 user_height_max) +{ + /* Images with dimensions larger than these limits will be + * rejected by png_set_IHDR(). To accept any PNG datastream + * regardless of dimensions, set both limits to 0x7ffffffL. + */ + if (png_ptr == NULL) + return; + + png_ptr->user_width_max = user_width_max; + png_ptr->user_height_max = user_height_max; +} + +/* This function was added to libpng 1.4.0 */ +void PNGAPI +png_set_chunk_cache_max (png_structp png_ptr, + png_uint_32 user_chunk_cache_max) +{ + if (png_ptr) + png_ptr->user_chunk_cache_max = user_chunk_cache_max; +} + +/* This function was added to libpng 1.4.1 */ +void PNGAPI +png_set_chunk_malloc_max (png_structp png_ptr, + png_alloc_size_t user_chunk_malloc_max) +{ + if (png_ptr) + png_ptr->user_chunk_malloc_max = user_chunk_malloc_max; +} +#endif /* ?PNG_SET_USER_LIMITS_SUPPORTED */ + + +#ifdef PNG_BENIGN_ERRORS_SUPPORTED +void PNGAPI +png_set_benign_errors(png_structp png_ptr, int allowed) +{ + png_debug(1, "in png_set_benign_errors"); + + if (allowed) + png_ptr->flags |= PNG_FLAG_BENIGN_ERRORS_WARN; + + else + png_ptr->flags &= ~PNG_FLAG_BENIGN_ERRORS_WARN; +} +#endif /* PNG_BENIGN_ERRORS_SUPPORTED */ +#endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */ diff --git a/programs/develop/libraries/libpng/pngstruct.h b/programs/develop/libraries/libpng/pngstruct.h new file mode 100644 index 0000000000..8d781faefe --- /dev/null +++ b/programs/develop/libraries/libpng/pngstruct.h @@ -0,0 +1,308 @@ + +/* pngstruct.h - header file for PNG reference library + * + * Copyright (c) 1998-2011 Glenn Randers-Pehrson + * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) + * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) + * + * Last changed in libpng 1.5.0 [January 6, 2011] + * + * This code is released under the libpng license. + * For conditions of distribution and use, see the disclaimer + * and license in png.h + */ + +/* The structure that holds the information to read and write PNG files. + * The only people who need to care about what is inside of this are the + * people who will be modifying the library for their own special needs. + * It should NOT be accessed directly by an application. + */ + +#ifndef PNGSTRUCT_H +#define PNGSTRUCT_H +/* zlib.h defines the structure z_stream, an instance of which is included + * in this structure and is required for decompressing the LZ compressed + * data in PNG files. + */ +#include "zlib.h" + +struct png_struct_def +{ +#ifdef PNG_SETJMP_SUPPORTED + jmp_buf png_jmpbuf; /* used in png_error */ + png_longjmp_ptr longjmp_fn;/* setjmp non-local goto function. */ +#endif + png_error_ptr error_fn; /* function for printing errors and aborting */ + png_error_ptr warning_fn; /* function for printing warnings */ + png_voidp error_ptr; /* user supplied struct for error functions */ + png_rw_ptr write_data_fn; /* function for writing output data */ + png_rw_ptr read_data_fn; /* function for reading input data */ + png_voidp io_ptr; /* ptr to application struct for I/O functions */ + +#ifdef PNG_READ_USER_TRANSFORM_SUPPORTED + png_user_transform_ptr read_user_transform_fn; /* user read transform */ +#endif + +#ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED + png_user_transform_ptr write_user_transform_fn; /* user write transform */ +#endif + +/* These were added in libpng-1.0.2 */ +#ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED +#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ + defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) + png_voidp user_transform_ptr; /* user supplied struct for user transform */ + png_byte user_transform_depth; /* bit depth of user transformed pixels */ + png_byte user_transform_channels; /* channels in user transformed pixels */ +#endif +#endif + + png_uint_32 mode; /* tells us where we are in the PNG file */ + png_uint_32 flags; /* flags indicating various things to libpng */ + png_uint_32 transformations; /* which transformations to perform */ + + z_stream zstream; /* pointer to decompression structure (below) */ + png_bytep zbuf; /* buffer for zlib */ + uInt zbuf_size; /* size of zbuf (typically 65536) */ + int zlib_level; /* holds zlib compression level */ + int zlib_method; /* holds zlib compression method */ + int zlib_window_bits; /* holds zlib compression window bits */ + int zlib_mem_level; /* holds zlib compression memory level */ + int zlib_strategy; /* holds zlib compression strategy */ + + png_uint_32 width; /* width of image in pixels */ + png_uint_32 height; /* height of image in pixels */ + png_uint_32 num_rows; /* number of rows in current pass */ + png_uint_32 usr_width; /* width of row at start of write */ + png_size_t rowbytes; /* size of row in bytes */ + png_uint_32 iwidth; /* width of current interlaced row in pixels */ + png_uint_32 row_number; /* current row in interlace pass */ + png_bytep prev_row; /* buffer to save previous (unfiltered) row */ + png_bytep row_buf; /* buffer to save current (unfiltered) row */ + png_bytep sub_row; /* buffer to save "sub" row when filtering */ + png_bytep up_row; /* buffer to save "up" row when filtering */ + png_bytep avg_row; /* buffer to save "avg" row when filtering */ + png_bytep paeth_row; /* buffer to save "Paeth" row when filtering */ + png_row_info row_info; /* used for transformation routines */ + + png_uint_32 idat_size; /* current IDAT size for read */ + png_uint_32 crc; /* current chunk CRC value */ + png_colorp palette; /* palette from the input file */ + png_uint_16 num_palette; /* number of color entries in palette */ + png_uint_16 num_trans; /* number of transparency values */ + png_byte chunk_name[5]; /* null-terminated name of current chunk */ + png_byte compression; /* file compression type (always 0) */ + png_byte filter; /* file filter type (always 0) */ + png_byte interlaced; /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */ + png_byte pass; /* current interlace pass (0 - 6) */ + png_byte do_filter; /* row filter flags (see PNG_FILTER_ below ) */ + png_byte color_type; /* color type of file */ + png_byte bit_depth; /* bit depth of file */ + png_byte usr_bit_depth; /* bit depth of users row */ + png_byte pixel_depth; /* number of bits per pixel */ + png_byte channels; /* number of channels in file */ + png_byte usr_channels; /* channels at start of write */ + png_byte sig_bytes; /* magic bytes read/written from start of file */ + +#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) + png_uint_16 filler; /* filler bytes for pixel expansion */ +#endif + +#ifdef PNG_bKGD_SUPPORTED + png_byte background_gamma_type; + png_fixed_point background_gamma; + png_color_16 background; /* background color in screen gamma space */ +#ifdef PNG_READ_GAMMA_SUPPORTED + png_color_16 background_1; /* background normalized to gamma 1.0 */ +#endif +#endif /* PNG_bKGD_SUPPORTED */ + +#ifdef PNG_WRITE_FLUSH_SUPPORTED + png_flush_ptr output_flush_fn; /* Function for flushing output */ + png_uint_32 flush_dist; /* how many rows apart to flush, 0 - no flush */ + png_uint_32 flush_rows; /* number of rows written since last flush */ +#endif + +#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) + int gamma_shift; /* number of "insignificant" bits in 16-bit gamma */ + png_fixed_point gamma; /* file gamma value */ + png_fixed_point screen_gamma; /* screen gamma value (display_exponent) */ +#endif + +#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) + png_bytep gamma_table; /* gamma table for 8-bit depth files */ + png_bytep gamma_from_1; /* converts from 1.0 to screen */ + png_bytep gamma_to_1; /* converts from file to 1.0 */ + png_uint_16pp gamma_16_table; /* gamma table for 16-bit depth files */ + png_uint_16pp gamma_16_from_1; /* converts from 1.0 to screen */ + png_uint_16pp gamma_16_to_1; /* converts from file to 1.0 */ +#endif + +#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED) + png_color_8 sig_bit; /* significant bits in each available channel */ +#endif + +#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) + png_color_8 shift; /* shift for significant bit tranformation */ +#endif + +#if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \ + || defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) + png_bytep trans_alpha; /* alpha values for paletted files */ + png_color_16 trans_color; /* transparent color for non-paletted files */ +#endif + + png_read_status_ptr read_row_fn; /* called after each row is decoded */ + png_write_status_ptr write_row_fn; /* called after each row is encoded */ +#ifdef PNG_PROGRESSIVE_READ_SUPPORTED + png_progressive_info_ptr info_fn; /* called after header data fully read */ + png_progressive_row_ptr row_fn; /* called after a prog. row is decoded */ + png_progressive_end_ptr end_fn; /* called after image is complete */ + png_bytep save_buffer_ptr; /* current location in save_buffer */ + png_bytep save_buffer; /* buffer for previously read data */ + png_bytep current_buffer_ptr; /* current location in current_buffer */ + png_bytep current_buffer; /* buffer for recently used data */ + png_uint_32 push_length; /* size of current input chunk */ + png_uint_32 skip_length; /* bytes to skip in input data */ + png_size_t save_buffer_size; /* amount of data now in save_buffer */ + png_size_t save_buffer_max; /* total size of save_buffer */ + png_size_t buffer_size; /* total amount of available input data */ + png_size_t current_buffer_size; /* amount of data now in current_buffer */ + int process_mode; /* what push library is currently doing */ + int cur_palette; /* current push library palette index */ + +# ifdef PNG_TEXT_SUPPORTED + png_size_t current_text_size; /* current size of text input data */ + png_size_t current_text_left; /* how much text left to read in input */ + png_charp current_text; /* current text chunk buffer */ + png_charp current_text_ptr; /* current location in current_text */ +# endif /* PNG_PROGRESSIVE_READ_SUPPORTED && PNG_TEXT_SUPPORTED */ + +#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ + +#if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__) +/* For the Borland special 64K segment handler */ + png_bytepp offset_table_ptr; + png_bytep offset_table; + png_uint_16 offset_table_number; + png_uint_16 offset_table_count; + png_uint_16 offset_table_count_free; +#endif + +#ifdef PNG_READ_QUANTIZE_SUPPORTED + png_bytep palette_lookup; /* lookup table for quantizing */ + png_bytep quantize_index; /* index translation for palette files */ +#endif + +#if defined(PNG_READ_QUANTIZE_SUPPORTED) || defined(PNG_hIST_SUPPORTED) + png_uint_16p hist; /* histogram */ +#endif + +#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED + png_byte heuristic_method; /* heuristic for row filter selection */ + png_byte num_prev_filters; /* number of weights for previous rows */ + png_bytep prev_filters; /* filter type(s) of previous row(s) */ + png_uint_16p filter_weights; /* weight(s) for previous line(s) */ + png_uint_16p inv_filter_weights; /* 1/weight(s) for previous line(s) */ + png_uint_16p filter_costs; /* relative filter calculation cost */ + png_uint_16p inv_filter_costs; /* 1/relative filter calculation cost */ +#endif + +#ifdef PNG_TIME_RFC1123_SUPPORTED + png_charp time_buffer; /* String to hold RFC 1123 time text */ +#endif + +/* New members added in libpng-1.0.6 */ + + png_uint_32 free_me; /* flags items libpng is responsible for freeing */ + +#ifdef PNG_USER_CHUNKS_SUPPORTED + png_voidp user_chunk_ptr; + png_user_chunk_ptr read_user_chunk_fn; /* user read chunk handler */ +#endif + +#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED + int num_chunk_list; + png_bytep chunk_list; +#endif + +/* New members added in libpng-1.0.3 */ +#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED + png_byte rgb_to_gray_status; + /* These were changed from png_byte in libpng-1.0.6 */ + png_uint_16 rgb_to_gray_red_coeff; + png_uint_16 rgb_to_gray_green_coeff; + png_uint_16 rgb_to_gray_blue_coeff; +#endif + +/* New member added in libpng-1.0.4 (renamed in 1.0.9) */ +#if defined(PNG_MNG_FEATURES_SUPPORTED) || \ + defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \ + defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED) +/* Changed from png_byte to png_uint_32 at version 1.2.0 */ + png_uint_32 mng_features_permitted; +#endif + +/* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */ +#ifdef PNG_MNG_FEATURES_SUPPORTED + png_byte filter_type; +#endif + +/* New members added in libpng-1.2.0 */ + +/* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */ +#ifdef PNG_USER_MEM_SUPPORTED + png_voidp mem_ptr; /* user supplied struct for mem functions */ + png_malloc_ptr malloc_fn; /* function for allocating memory */ + png_free_ptr free_fn; /* function for freeing memory */ +#endif + +/* New member added in libpng-1.0.13 and 1.2.0 */ + png_bytep big_row_buf; /* buffer to save current (unfiltered) row */ + +#ifdef PNG_READ_QUANTIZE_SUPPORTED +/* The following three members were added at version 1.0.14 and 1.2.4 */ + png_bytep quantize_sort; /* working sort array */ + png_bytep index_to_palette; /* where the original index currently is + in the palette */ + png_bytep palette_to_index; /* which original index points to this + palette color */ +#endif + +/* New members added in libpng-1.0.16 and 1.2.6 */ + png_byte compression_type; + +#ifdef PNG_USER_LIMITS_SUPPORTED + png_uint_32 user_width_max; + png_uint_32 user_height_max; + + /* Added in libpng-1.4.0: Total number of sPLT, text, and unknown + * chunks that can be stored (0 means unlimited). + */ + png_uint_32 user_chunk_cache_max; + + /* Total memory that a zTXt, sPLT, iTXt, iCCP, or unknown chunk + * can occupy when decompressed. 0 means unlimited. + */ + png_alloc_size_t user_chunk_malloc_max; +#endif + +/* New member added in libpng-1.0.25 and 1.2.17 */ +#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED + /* Storage for unknown chunk that the library doesn't recognize. */ + png_unknown_chunk unknown_chunk; +#endif + +/* New members added in libpng-1.2.26 */ + png_size_t old_big_row_buf_size; + png_size_t old_prev_row_size; + +/* New member added in libpng-1.2.30 */ + png_charp chunkdata; /* buffer for reading chunk data */ + +#ifdef PNG_IO_STATE_SUPPORTED +/* New member added in libpng-1.4.0 */ + png_uint_32 io_state; +#endif +}; +#endif /* PNGSTRUCT_H */ diff --git a/programs/develop/libraries/libpng/pngtrans.c b/programs/develop/libraries/libpng/pngtrans.c new file mode 100644 index 0000000000..137f555a62 --- /dev/null +++ b/programs/develop/libraries/libpng/pngtrans.c @@ -0,0 +1,723 @@ + +/* pngtrans.c - transforms the data in a row (used by both readers and writers) + * + * Last changed in libpng 1.5.1 [February 3, 2011] + * Copyright (c) 1998-2011 Glenn Randers-Pehrson + * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) + * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) + * + * This code is released under the libpng license. + * For conditions of distribution and use, see the disclaimer + * and license in png.h + */ + +#include "pngpriv.h" + +#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) + +#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) +/* Turn on BGR-to-RGB mapping */ +void PNGAPI +png_set_bgr(png_structp png_ptr) +{ + png_debug(1, "in png_set_bgr"); + + if (png_ptr == NULL) + return; + + png_ptr->transformations |= PNG_BGR; +} +#endif + +#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) +/* Turn on 16 bit byte swapping */ +void PNGAPI +png_set_swap(png_structp png_ptr) +{ + png_debug(1, "in png_set_swap"); + + if (png_ptr == NULL) + return; + + if (png_ptr->bit_depth == 16) + png_ptr->transformations |= PNG_SWAP_BYTES; +} +#endif + +#if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED) +/* Turn on pixel packing */ +void PNGAPI +png_set_packing(png_structp png_ptr) +{ + png_debug(1, "in png_set_packing"); + + if (png_ptr == NULL) + return; + + if (png_ptr->bit_depth < 8) + { + png_ptr->transformations |= PNG_PACK; + png_ptr->usr_bit_depth = 8; + } +} +#endif + +#if defined(PNG_READ_PACKSWAP_SUPPORTED)||defined(PNG_WRITE_PACKSWAP_SUPPORTED) +/* Turn on packed pixel swapping */ +void PNGAPI +png_set_packswap(png_structp png_ptr) +{ + png_debug(1, "in png_set_packswap"); + + if (png_ptr == NULL) + return; + + if (png_ptr->bit_depth < 8) + png_ptr->transformations |= PNG_PACKSWAP; +} +#endif + +#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) +void PNGAPI +png_set_shift(png_structp png_ptr, png_const_color_8p true_bits) +{ + png_debug(1, "in png_set_shift"); + + if (png_ptr == NULL) + return; + + png_ptr->transformations |= PNG_SHIFT; + png_ptr->shift = *true_bits; +} +#endif + +#if defined(PNG_READ_INTERLACING_SUPPORTED) || \ + defined(PNG_WRITE_INTERLACING_SUPPORTED) +int PNGAPI +png_set_interlace_handling(png_structp png_ptr) +{ + png_debug(1, "in png_set_interlace handling"); + + if (png_ptr && png_ptr->interlaced) + { + png_ptr->transformations |= PNG_INTERLACE; + return (7); + } + + return (1); +} +#endif + +#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) +/* Add a filler byte on read, or remove a filler or alpha byte on write. + * The filler type has changed in v0.95 to allow future 2-byte fillers + * for 48-bit input data, as well as to avoid problems with some compilers + * that don't like bytes as parameters. + */ +void PNGAPI +png_set_filler(png_structp png_ptr, png_uint_32 filler, int filler_loc) +{ + png_debug(1, "in png_set_filler"); + + if (png_ptr == NULL) + return; + + png_ptr->transformations |= PNG_FILLER; + png_ptr->filler = (png_uint_16)filler; + + if (filler_loc == PNG_FILLER_AFTER) + png_ptr->flags |= PNG_FLAG_FILLER_AFTER; + + else + png_ptr->flags &= ~PNG_FLAG_FILLER_AFTER; + + /* This should probably go in the "do_read_filler" routine. + * I attempted to do that in libpng-1.0.1a but that caused problems + * so I restored it in libpng-1.0.2a + */ + + if (png_ptr->color_type == PNG_COLOR_TYPE_RGB) + { + png_ptr->usr_channels = 4; + } + + /* Also I added this in libpng-1.0.2a (what happens when we expand + * a less-than-8-bit grayscale to GA?) */ + + if (png_ptr->color_type == PNG_COLOR_TYPE_GRAY && png_ptr->bit_depth >= 8) + { + png_ptr->usr_channels = 2; + } +} + +/* Added to libpng-1.2.7 */ +void PNGAPI +png_set_add_alpha(png_structp png_ptr, png_uint_32 filler, int filler_loc) +{ + png_debug(1, "in png_set_add_alpha"); + + if (png_ptr == NULL) + return; + + png_set_filler(png_ptr, filler, filler_loc); + png_ptr->transformations |= PNG_ADD_ALPHA; +} + +#endif + +#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \ + defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) +void PNGAPI +png_set_swap_alpha(png_structp png_ptr) +{ + png_debug(1, "in png_set_swap_alpha"); + + if (png_ptr == NULL) + return; + + png_ptr->transformations |= PNG_SWAP_ALPHA; +} +#endif + +#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \ + defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) +void PNGAPI +png_set_invert_alpha(png_structp png_ptr) +{ + png_debug(1, "in png_set_invert_alpha"); + + if (png_ptr == NULL) + return; + + png_ptr->transformations |= PNG_INVERT_ALPHA; +} +#endif + +#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) +void PNGAPI +png_set_invert_mono(png_structp png_ptr) +{ + png_debug(1, "in png_set_invert_mono"); + + if (png_ptr == NULL) + return; + + png_ptr->transformations |= PNG_INVERT_MONO; +} + +/* Invert monochrome grayscale data */ +void /* PRIVATE */ +png_do_invert(png_row_infop row_info, png_bytep row) +{ + png_debug(1, "in png_do_invert"); + + /* This test removed from libpng version 1.0.13 and 1.2.0: + * if (row_info->bit_depth == 1 && + */ + if (row_info->color_type == PNG_COLOR_TYPE_GRAY) + { + png_bytep rp = row; + png_size_t i; + png_size_t istop = row_info->rowbytes; + + for (i = 0; i < istop; i++) + { + *rp = (png_byte)(~(*rp)); + rp++; + } + } + + else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA && + row_info->bit_depth == 8) + { + png_bytep rp = row; + png_size_t i; + png_size_t istop = row_info->rowbytes; + + for (i = 0; i < istop; i += 2) + { + *rp = (png_byte)(~(*rp)); + rp += 2; + } + } + +#ifdef PNG_16BIT_SUPPORTED + else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA && + row_info->bit_depth == 16) + { + png_bytep rp = row; + png_size_t i; + png_size_t istop = row_info->rowbytes; + + for (i = 0; i < istop; i += 4) + { + *rp = (png_byte)(~(*rp)); + *(rp + 1) = (png_byte)(~(*(rp + 1))); + rp += 4; + } + } +#endif +} +#endif + +#ifdef PNG_16BIT_SUPPORTED +#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) +/* Swaps byte order on 16 bit depth images */ +void /* PRIVATE */ +png_do_swap(png_row_infop row_info, png_bytep row) +{ + png_debug(1, "in png_do_swap"); + + if (row_info->bit_depth == 16) + { + png_bytep rp = row; + png_uint_32 i; + png_uint_32 istop= row_info->width * row_info->channels; + + for (i = 0; i < istop; i++, rp += 2) + { + png_byte t = *rp; + *rp = *(rp + 1); + *(rp + 1) = t; + } + } +} +#endif +#endif + +#if defined(PNG_READ_PACKSWAP_SUPPORTED)||defined(PNG_WRITE_PACKSWAP_SUPPORTED) +static PNG_CONST png_byte onebppswaptable[256] = { + 0x00, 0x80, 0x40, 0xC0, 0x20, 0xA0, 0x60, 0xE0, + 0x10, 0x90, 0x50, 0xD0, 0x30, 0xB0, 0x70, 0xF0, + 0x08, 0x88, 0x48, 0xC8, 0x28, 0xA8, 0x68, 0xE8, + 0x18, 0x98, 0x58, 0xD8, 0x38, 0xB8, 0x78, 0xF8, + 0x04, 0x84, 0x44, 0xC4, 0x24, 0xA4, 0x64, 0xE4, + 0x14, 0x94, 0x54, 0xD4, 0x34, 0xB4, 0x74, 0xF4, + 0x0C, 0x8C, 0x4C, 0xCC, 0x2C, 0xAC, 0x6C, 0xEC, + 0x1C, 0x9C, 0x5C, 0xDC, 0x3C, 0xBC, 0x7C, 0xFC, + 0x02, 0x82, 0x42, 0xC2, 0x22, 0xA2, 0x62, 0xE2, + 0x12, 0x92, 0x52, 0xD2, 0x32, 0xB2, 0x72, 0xF2, + 0x0A, 0x8A, 0x4A, 0xCA, 0x2A, 0xAA, 0x6A, 0xEA, + 0x1A, 0x9A, 0x5A, 0xDA, 0x3A, 0xBA, 0x7A, 0xFA, + 0x06, 0x86, 0x46, 0xC6, 0x26, 0xA6, 0x66, 0xE6, + 0x16, 0x96, 0x56, 0xD6, 0x36, 0xB6, 0x76, 0xF6, + 0x0E, 0x8E, 0x4E, 0xCE, 0x2E, 0xAE, 0x6E, 0xEE, + 0x1E, 0x9E, 0x5E, 0xDE, 0x3E, 0xBE, 0x7E, 0xFE, + 0x01, 0x81, 0x41, 0xC1, 0x21, 0xA1, 0x61, 0xE1, + 0x11, 0x91, 0x51, 0xD1, 0x31, 0xB1, 0x71, 0xF1, + 0x09, 0x89, 0x49, 0xC9, 0x29, 0xA9, 0x69, 0xE9, + 0x19, 0x99, 0x59, 0xD9, 0x39, 0xB9, 0x79, 0xF9, + 0x05, 0x85, 0x45, 0xC5, 0x25, 0xA5, 0x65, 0xE5, + 0x15, 0x95, 0x55, 0xD5, 0x35, 0xB5, 0x75, 0xF5, + 0x0D, 0x8D, 0x4D, 0xCD, 0x2D, 0xAD, 0x6D, 0xED, + 0x1D, 0x9D, 0x5D, 0xDD, 0x3D, 0xBD, 0x7D, 0xFD, + 0x03, 0x83, 0x43, 0xC3, 0x23, 0xA3, 0x63, 0xE3, + 0x13, 0x93, 0x53, 0xD3, 0x33, 0xB3, 0x73, 0xF3, + 0x0B, 0x8B, 0x4B, 0xCB, 0x2B, 0xAB, 0x6B, 0xEB, + 0x1B, 0x9B, 0x5B, 0xDB, 0x3B, 0xBB, 0x7B, 0xFB, + 0x07, 0x87, 0x47, 0xC7, 0x27, 0xA7, 0x67, 0xE7, + 0x17, 0x97, 0x57, 0xD7, 0x37, 0xB7, 0x77, 0xF7, + 0x0F, 0x8F, 0x4F, 0xCF, 0x2F, 0xAF, 0x6F, 0xEF, + 0x1F, 0x9F, 0x5F, 0xDF, 0x3F, 0xBF, 0x7F, 0xFF +}; + +static PNG_CONST png_byte twobppswaptable[256] = { + 0x00, 0x40, 0x80, 0xC0, 0x10, 0x50, 0x90, 0xD0, + 0x20, 0x60, 0xA0, 0xE0, 0x30, 0x70, 0xB0, 0xF0, + 0x04, 0x44, 0x84, 0xC4, 0x14, 0x54, 0x94, 0xD4, + 0x24, 0x64, 0xA4, 0xE4, 0x34, 0x74, 0xB4, 0xF4, + 0x08, 0x48, 0x88, 0xC8, 0x18, 0x58, 0x98, 0xD8, + 0x28, 0x68, 0xA8, 0xE8, 0x38, 0x78, 0xB8, 0xF8, + 0x0C, 0x4C, 0x8C, 0xCC, 0x1C, 0x5C, 0x9C, 0xDC, + 0x2C, 0x6C, 0xAC, 0xEC, 0x3C, 0x7C, 0xBC, 0xFC, + 0x01, 0x41, 0x81, 0xC1, 0x11, 0x51, 0x91, 0xD1, + 0x21, 0x61, 0xA1, 0xE1, 0x31, 0x71, 0xB1, 0xF1, + 0x05, 0x45, 0x85, 0xC5, 0x15, 0x55, 0x95, 0xD5, + 0x25, 0x65, 0xA5, 0xE5, 0x35, 0x75, 0xB5, 0xF5, + 0x09, 0x49, 0x89, 0xC9, 0x19, 0x59, 0x99, 0xD9, + 0x29, 0x69, 0xA9, 0xE9, 0x39, 0x79, 0xB9, 0xF9, + 0x0D, 0x4D, 0x8D, 0xCD, 0x1D, 0x5D, 0x9D, 0xDD, + 0x2D, 0x6D, 0xAD, 0xED, 0x3D, 0x7D, 0xBD, 0xFD, + 0x02, 0x42, 0x82, 0xC2, 0x12, 0x52, 0x92, 0xD2, + 0x22, 0x62, 0xA2, 0xE2, 0x32, 0x72, 0xB2, 0xF2, + 0x06, 0x46, 0x86, 0xC6, 0x16, 0x56, 0x96, 0xD6, + 0x26, 0x66, 0xA6, 0xE6, 0x36, 0x76, 0xB6, 0xF6, + 0x0A, 0x4A, 0x8A, 0xCA, 0x1A, 0x5A, 0x9A, 0xDA, + 0x2A, 0x6A, 0xAA, 0xEA, 0x3A, 0x7A, 0xBA, 0xFA, + 0x0E, 0x4E, 0x8E, 0xCE, 0x1E, 0x5E, 0x9E, 0xDE, + 0x2E, 0x6E, 0xAE, 0xEE, 0x3E, 0x7E, 0xBE, 0xFE, + 0x03, 0x43, 0x83, 0xC3, 0x13, 0x53, 0x93, 0xD3, + 0x23, 0x63, 0xA3, 0xE3, 0x33, 0x73, 0xB3, 0xF3, + 0x07, 0x47, 0x87, 0xC7, 0x17, 0x57, 0x97, 0xD7, + 0x27, 0x67, 0xA7, 0xE7, 0x37, 0x77, 0xB7, 0xF7, + 0x0B, 0x4B, 0x8B, 0xCB, 0x1B, 0x5B, 0x9B, 0xDB, + 0x2B, 0x6B, 0xAB, 0xEB, 0x3B, 0x7B, 0xBB, 0xFB, + 0x0F, 0x4F, 0x8F, 0xCF, 0x1F, 0x5F, 0x9F, 0xDF, + 0x2F, 0x6F, 0xAF, 0xEF, 0x3F, 0x7F, 0xBF, 0xFF +}; + +static PNG_CONST png_byte fourbppswaptable[256] = { + 0x00, 0x10, 0x20, 0x30, 0x40, 0x50, 0x60, 0x70, + 0x80, 0x90, 0xA0, 0xB0, 0xC0, 0xD0, 0xE0, 0xF0, + 0x01, 0x11, 0x21, 0x31, 0x41, 0x51, 0x61, 0x71, + 0x81, 0x91, 0xA1, 0xB1, 0xC1, 0xD1, 0xE1, 0xF1, + 0x02, 0x12, 0x22, 0x32, 0x42, 0x52, 0x62, 0x72, + 0x82, 0x92, 0xA2, 0xB2, 0xC2, 0xD2, 0xE2, 0xF2, + 0x03, 0x13, 0x23, 0x33, 0x43, 0x53, 0x63, 0x73, + 0x83, 0x93, 0xA3, 0xB3, 0xC3, 0xD3, 0xE3, 0xF3, + 0x04, 0x14, 0x24, 0x34, 0x44, 0x54, 0x64, 0x74, + 0x84, 0x94, 0xA4, 0xB4, 0xC4, 0xD4, 0xE4, 0xF4, + 0x05, 0x15, 0x25, 0x35, 0x45, 0x55, 0x65, 0x75, + 0x85, 0x95, 0xA5, 0xB5, 0xC5, 0xD5, 0xE5, 0xF5, + 0x06, 0x16, 0x26, 0x36, 0x46, 0x56, 0x66, 0x76, + 0x86, 0x96, 0xA6, 0xB6, 0xC6, 0xD6, 0xE6, 0xF6, + 0x07, 0x17, 0x27, 0x37, 0x47, 0x57, 0x67, 0x77, + 0x87, 0x97, 0xA7, 0xB7, 0xC7, 0xD7, 0xE7, 0xF7, + 0x08, 0x18, 0x28, 0x38, 0x48, 0x58, 0x68, 0x78, + 0x88, 0x98, 0xA8, 0xB8, 0xC8, 0xD8, 0xE8, 0xF8, + 0x09, 0x19, 0x29, 0x39, 0x49, 0x59, 0x69, 0x79, + 0x89, 0x99, 0xA9, 0xB9, 0xC9, 0xD9, 0xE9, 0xF9, + 0x0A, 0x1A, 0x2A, 0x3A, 0x4A, 0x5A, 0x6A, 0x7A, + 0x8A, 0x9A, 0xAA, 0xBA, 0xCA, 0xDA, 0xEA, 0xFA, + 0x0B, 0x1B, 0x2B, 0x3B, 0x4B, 0x5B, 0x6B, 0x7B, + 0x8B, 0x9B, 0xAB, 0xBB, 0xCB, 0xDB, 0xEB, 0xFB, + 0x0C, 0x1C, 0x2C, 0x3C, 0x4C, 0x5C, 0x6C, 0x7C, + 0x8C, 0x9C, 0xAC, 0xBC, 0xCC, 0xDC, 0xEC, 0xFC, + 0x0D, 0x1D, 0x2D, 0x3D, 0x4D, 0x5D, 0x6D, 0x7D, + 0x8D, 0x9D, 0xAD, 0xBD, 0xCD, 0xDD, 0xED, 0xFD, + 0x0E, 0x1E, 0x2E, 0x3E, 0x4E, 0x5E, 0x6E, 0x7E, + 0x8E, 0x9E, 0xAE, 0xBE, 0xCE, 0xDE, 0xEE, 0xFE, + 0x0F, 0x1F, 0x2F, 0x3F, 0x4F, 0x5F, 0x6F, 0x7F, + 0x8F, 0x9F, 0xAF, 0xBF, 0xCF, 0xDF, 0xEF, 0xFF +}; + +/* Swaps pixel packing order within bytes */ +void /* PRIVATE */ +png_do_packswap(png_row_infop row_info, png_bytep row) +{ + png_debug(1, "in png_do_packswap"); + + if (row_info->bit_depth < 8) + { + png_bytep rp; + png_const_bytep end, table; + + end = row + row_info->rowbytes; + + if (row_info->bit_depth == 1) + table = onebppswaptable; + + else if (row_info->bit_depth == 2) + table = twobppswaptable; + + else if (row_info->bit_depth == 4) + table = fourbppswaptable; + + else + return; + + for (rp = row; rp < end; rp++) + *rp = table[*rp]; + } +} +#endif /* PNG_READ_PACKSWAP_SUPPORTED or PNG_WRITE_PACKSWAP_SUPPORTED */ + +#if defined(PNG_WRITE_FILLER_SUPPORTED) || \ + defined(PNG_READ_STRIP_ALPHA_SUPPORTED) +/* Remove filler or alpha byte(s) */ +void /* PRIVATE */ +png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags) +{ + png_debug(1, "in png_do_strip_filler"); + + { + png_bytep sp = row; + png_bytep dp = row; + png_uint_32 row_width = row_info->width; + png_uint_32 i; + + if ((row_info->color_type == PNG_COLOR_TYPE_RGB || + (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA && + (flags & PNG_FLAG_STRIP_ALPHA))) && + row_info->channels == 4) + { + if (row_info->bit_depth == 8) + { + /* This converts from RGBX or RGBA to RGB */ + if (flags & PNG_FLAG_FILLER_AFTER) + { + dp += 3; sp += 4; + for (i = 1; i < row_width; i++) + { + *dp++ = *sp++; + *dp++ = *sp++; + *dp++ = *sp++; + sp++; + } + } + + /* This converts from XRGB or ARGB to RGB */ + else + { + for (i = 0; i < row_width; i++) + { + sp++; + *dp++ = *sp++; + *dp++ = *sp++; + *dp++ = *sp++; + } + } + row_info->pixel_depth = 24; + row_info->rowbytes = row_width * 3; + } + + else /* if (row_info->bit_depth == 16) */ + { + if (flags & PNG_FLAG_FILLER_AFTER) + { + /* This converts from RRGGBBXX or RRGGBBAA to RRGGBB */ + sp += 8; dp += 6; + for (i = 1; i < row_width; i++) + { + /* This could be (although png_memcpy is probably slower): + png_memcpy(dp, sp, 6); + sp += 8; + dp += 6; + */ + + *dp++ = *sp++; + *dp++ = *sp++; + *dp++ = *sp++; + *dp++ = *sp++; + *dp++ = *sp++; + *dp++ = *sp++; + sp += 2; + } + } + + else + { + /* This converts from XXRRGGBB or AARRGGBB to RRGGBB */ + for (i = 0; i < row_width; i++) + { + /* This could be (although png_memcpy is probably slower): + png_memcpy(dp, sp, 6); + sp += 8; + dp += 6; + */ + + sp += 2; + *dp++ = *sp++; + *dp++ = *sp++; + *dp++ = *sp++; + *dp++ = *sp++; + *dp++ = *sp++; + *dp++ = *sp++; + } + } + + row_info->pixel_depth = 48; + row_info->rowbytes = row_width * 6; + } + row_info->channels = 3; + } + + else if ((row_info->color_type == PNG_COLOR_TYPE_GRAY || + (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA && + (flags & PNG_FLAG_STRIP_ALPHA))) && + row_info->channels == 2) + { + if (row_info->bit_depth == 8) + { + if (flags & PNG_FLAG_FILLER_AFTER) + { + /* This converts from GX or GA to G */ + for (i = 0; i < row_width; i++) + { + *dp++ = *sp++; + sp++; + } + } + + else + { + /* This converts from XG or AG to G */ + for (i = 0; i < row_width; i++) + { + sp++; + *dp++ = *sp++; + } + } + + row_info->pixel_depth = 8; + row_info->rowbytes = row_width; + } + + else /* if (row_info->bit_depth == 16) */ + { + if (flags & PNG_FLAG_FILLER_AFTER) + { + /* This converts from GGXX or GGAA to GG */ + sp += 4; dp += 2; + for (i = 1; i < row_width; i++) + { + *dp++ = *sp++; + *dp++ = *sp++; + sp += 2; + } + } + + else + { + /* This converts from XXGG or AAGG to GG */ + for (i = 0; i < row_width; i++) + { + sp += 2; + *dp++ = *sp++; + *dp++ = *sp++; + } + } + + row_info->pixel_depth = 16; + row_info->rowbytes = row_width * 2; + } + row_info->channels = 1; + } + + if (flags & PNG_FLAG_STRIP_ALPHA) + row_info->color_type = (png_byte)(row_info->color_type & + ~PNG_COLOR_MASK_ALPHA); + } +} +#endif + +#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) +/* Swaps red and blue bytes within a pixel */ +void /* PRIVATE */ +png_do_bgr(png_row_infop row_info, png_bytep row) +{ + png_debug(1, "in png_do_bgr"); + + if ((row_info->color_type & PNG_COLOR_MASK_COLOR)) + { + png_uint_32 row_width = row_info->width; + if (row_info->bit_depth == 8) + { + if (row_info->color_type == PNG_COLOR_TYPE_RGB) + { + png_bytep rp; + png_uint_32 i; + + for (i = 0, rp = row; i < row_width; i++, rp += 3) + { + png_byte save = *rp; + *rp = *(rp + 2); + *(rp + 2) = save; + } + } + + else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) + { + png_bytep rp; + png_uint_32 i; + + for (i = 0, rp = row; i < row_width; i++, rp += 4) + { + png_byte save = *rp; + *rp = *(rp + 2); + *(rp + 2) = save; + } + } + } + +#ifdef PNG_16BIT_SUPPORTED + else if (row_info->bit_depth == 16) + { + if (row_info->color_type == PNG_COLOR_TYPE_RGB) + { + png_bytep rp; + png_uint_32 i; + + for (i = 0, rp = row; i < row_width; i++, rp += 6) + { + png_byte save = *rp; + *rp = *(rp + 4); + *(rp + 4) = save; + save = *(rp + 1); + *(rp + 1) = *(rp + 5); + *(rp + 5) = save; + } + } + + else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) + { + png_bytep rp; + png_uint_32 i; + + for (i = 0, rp = row; i < row_width; i++, rp += 8) + { + png_byte save = *rp; + *rp = *(rp + 4); + *(rp + 4) = save; + save = *(rp + 1); + *(rp + 1) = *(rp + 5); + *(rp + 5) = save; + } + } + } +#endif + } +} +#endif /* PNG_READ_BGR_SUPPORTED or PNG_WRITE_BGR_SUPPORTED */ + +#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ + defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) +#ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED +void PNGAPI +png_set_user_transform_info(png_structp png_ptr, png_voidp + user_transform_ptr, int user_transform_depth, int user_transform_channels) +{ + png_debug(1, "in png_set_user_transform_info"); + + if (png_ptr == NULL) + return; + png_ptr->user_transform_ptr = user_transform_ptr; + png_ptr->user_transform_depth = (png_byte)user_transform_depth; + png_ptr->user_transform_channels = (png_byte)user_transform_channels; +} +#endif + +/* This function returns a pointer to the user_transform_ptr associated with + * the user transform functions. The application should free any memory + * associated with this pointer before png_write_destroy and png_read_destroy + * are called. + */ +#ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED +png_voidp PNGAPI +png_get_user_transform_ptr(png_const_structp png_ptr) +{ + if (png_ptr == NULL) + return (NULL); + + return ((png_voidp)png_ptr->user_transform_ptr); +} +#endif + +png_uint_32 PNGAPI +png_get_current_row_number(png_const_structp png_ptr) +{ + if (png_ptr != NULL) + return png_ptr->row_number; + return PNG_UINT_32_MAX; /* help the app not to fail silently */ +} + +png_byte PNGAPI +png_get_current_pass_number(png_const_structp png_ptr) +{ + if (png_ptr != NULL) + return png_ptr->pass; + return 8; /* invalid */ +} +#endif /* PNG_READ_USER_TRANSFORM_SUPPORTED || + PNG_WRITE_USER_TRANSFORM_SUPPORTED */ +#endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */ diff --git a/programs/develop/libraries/libpng/pngwio.c b/programs/develop/libraries/libpng/pngwio.c new file mode 100644 index 0000000000..95ffb3429f --- /dev/null +++ b/programs/develop/libraries/libpng/pngwio.c @@ -0,0 +1,254 @@ + +/* pngwio.c - functions for data output + * + * Last changed in libpng 1.5.0 [January 6, 2011] + * Copyright (c) 1998-2011 Glenn Randers-Pehrson + * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) + * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) + * + * This code is released under the libpng license. + * For conditions of distribution and use, see the disclaimer + * and license in png.h + * + * This file provides a location for all output. Users who need + * special handling are expected to write functions that have the same + * arguments as these and perform similar functions, but that possibly + * use different output methods. Note that you shouldn't change these + * functions, but rather write replacement functions and then change + * them at run time with png_set_write_fn(...). + */ + +#include "pngpriv.h" + +#ifdef PNG_WRITE_SUPPORTED + +/* Write the data to whatever output you are using. The default routine + * writes to a file pointer. Note that this routine sometimes gets called + * with very small lengths, so you should implement some kind of simple + * buffering if you are using unbuffered writes. This should never be asked + * to write more than 64K on a 16 bit machine. + */ + +void /* PRIVATE */ +png_write_data(png_structp png_ptr, png_const_bytep data, png_size_t length) +{ + /* NOTE: write_data_fn must not change the buffer! */ + if (png_ptr->write_data_fn != NULL ) + (*(png_ptr->write_data_fn))(png_ptr, (png_bytep)data, length); + + else + png_error(png_ptr, "Call to NULL write function"); +} + +#ifdef PNG_STDIO_SUPPORTED +/* This is the function that does the actual writing of data. If you are + * not writing to a standard C stream, you should create a replacement + * write_data function and use it at run time with png_set_write_fn(), rather + * than changing the library. + */ +#ifndef USE_FAR_KEYWORD +void PNGCBAPI +png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length) +{ + png_size_t check; + + if (png_ptr == NULL) + return; + + check = fwrite(data, 1, length, (png_FILE_p)(png_ptr->io_ptr)); + + if (check != length) + png_error(png_ptr, "Write Error"); +} +#else +/* This is the model-independent version. Since the standard I/O library + * can't handle far buffers in the medium and small models, we have to copy + * the data. + */ + +#define NEAR_BUF_SIZE 1024 +#define MIN(a,b) (a <= b ? a : b) + +void PNGCBAPI +png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length) +{ + png_uint_32 check; + png_byte *near_data; /* Needs to be "png_byte *" instead of "png_bytep" */ + png_FILE_p io_ptr; + + if (png_ptr == NULL) + return; + + /* Check if data really is near. If so, use usual code. */ + near_data = (png_byte *)CVT_PTR_NOCHECK(data); + io_ptr = (png_FILE_p)CVT_PTR(png_ptr->io_ptr); + + if ((png_bytep)near_data == data) + { + check = fwrite(near_data, 1, length, io_ptr); + } + + else + { + png_byte buf[NEAR_BUF_SIZE]; + png_size_t written, remaining, err; + check = 0; + remaining = length; + + do + { + written = MIN(NEAR_BUF_SIZE, remaining); + png_memcpy(buf, data, written); /* Copy far buffer to near buffer */ + err = fwrite(buf, 1, written, io_ptr); + + if (err != written) + break; + + else + check += err; + + data += written; + remaining -= written; + } + while (remaining != 0); + } + + if (check != length) + png_error(png_ptr, "Write Error"); +} + +#endif +#endif + +/* This function is called to output any data pending writing (normally + * to disk). After png_flush is called, there should be no data pending + * writing in any buffers. + */ +#ifdef PNG_WRITE_FLUSH_SUPPORTED +void /* PRIVATE */ +png_flush(png_structp png_ptr) +{ + if (png_ptr->output_flush_fn != NULL) + (*(png_ptr->output_flush_fn))(png_ptr); +} + +# ifdef PNG_STDIO_SUPPORTED +void PNGCBAPI +png_default_flush(png_structp png_ptr) +{ + png_FILE_p io_ptr; + + if (png_ptr == NULL) + return; + + io_ptr = (png_FILE_p)CVT_PTR((png_ptr->io_ptr)); + fflush(io_ptr); +} +# endif +#endif + +/* This function allows the application to supply new output functions for + * libpng if standard C streams aren't being used. + * + * This function takes as its arguments: + * png_ptr - pointer to a png output data structure + * io_ptr - pointer to user supplied structure containing info about + * the output functions. May be NULL. + * write_data_fn - pointer to a new output function that takes as its + * arguments a pointer to a png_struct, a pointer to + * data to be written, and a 32-bit unsigned int that is + * the number of bytes to be written. The new write + * function should call png_error(png_ptr, "Error msg") + * to exit and output any fatal error messages. May be + * NULL, in which case libpng's default function will + * be used. + * flush_data_fn - pointer to a new flush function that takes as its + * arguments a pointer to a png_struct. After a call to + * the flush function, there should be no data in any buffers + * or pending transmission. If the output method doesn't do + * any buffering of output, a function prototype must still be + * supplied although it doesn't have to do anything. If + * PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile + * time, output_flush_fn will be ignored, although it must be + * supplied for compatibility. May be NULL, in which case + * libpng's default function will be used, if + * PNG_WRITE_FLUSH_SUPPORTED is defined. This is not + * a good idea if io_ptr does not point to a standard + * *FILE structure. + */ +void PNGAPI +png_set_write_fn(png_structp png_ptr, png_voidp io_ptr, + png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn) +{ + if (png_ptr == NULL) + return; + + png_ptr->io_ptr = io_ptr; + +#ifdef PNG_STDIO_SUPPORTED + if (write_data_fn != NULL) + png_ptr->write_data_fn = write_data_fn; + + else + png_ptr->write_data_fn = png_default_write_data; +#else + png_ptr->write_data_fn = write_data_fn; +#endif + +#ifdef PNG_WRITE_FLUSH_SUPPORTED +# ifdef PNG_STDIO_SUPPORTED + + if (output_flush_fn != NULL) + png_ptr->output_flush_fn = output_flush_fn; + + else + png_ptr->output_flush_fn = png_default_flush; + +# else + png_ptr->output_flush_fn = output_flush_fn; +# endif +#endif /* PNG_WRITE_FLUSH_SUPPORTED */ + + /* It is an error to read while writing a png file */ + if (png_ptr->read_data_fn != NULL) + { + png_ptr->read_data_fn = NULL; + + png_warning(png_ptr, + "Can't set both read_data_fn and write_data_fn in the" + " same structure"); + } +} + +#ifdef USE_FAR_KEYWORD +# ifdef _MSC_VER +void *png_far_to_near(png_structp png_ptr, png_voidp ptr, int check) +{ + void *near_ptr; + void FAR *far_ptr; + FP_OFF(near_ptr) = FP_OFF(ptr); + far_ptr = (void FAR *)near_ptr; + + if (check != 0) + if (FP_SEG(ptr) != FP_SEG(far_ptr)) + png_error(png_ptr, "segment lost in conversion"); + + return(near_ptr); +} +# else +void *png_far_to_near(png_structp png_ptr, png_voidp ptr, int check) +{ + void *near_ptr; + void FAR *far_ptr; + near_ptr = (void FAR *)ptr; + far_ptr = (void FAR *)near_ptr; + + if (check != 0) + if (far_ptr != ptr) + png_error(png_ptr, "segment lost in conversion"); + + return(near_ptr); +} +# endif +#endif +#endif /* PNG_WRITE_SUPPORTED */ diff --git a/programs/develop/libraries/libpng/pngwrite.c b/programs/develop/libraries/libpng/pngwrite.c new file mode 100644 index 0000000000..d90f449e30 --- /dev/null +++ b/programs/develop/libraries/libpng/pngwrite.c @@ -0,0 +1,1605 @@ + +/* pngwrite.c - general routines to write a PNG file + * + * Last changed in libpng 1.5.1 [February 3, 2011] + * Copyright (c) 1998-2011 Glenn Randers-Pehrson + * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) + * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) + * + * This code is released under the libpng license. + * For conditions of distribution and use, see the disclaimer + * and license in png.h + */ + +#include "pngpriv.h" + +#ifdef PNG_WRITE_SUPPORTED + +/* Writes all the PNG information. This is the suggested way to use the + * library. If you have a new chunk to add, make a function to write it, + * and put it in the correct location here. If you want the chunk written + * after the image data, put it in png_write_end(). I strongly encourage + * you to supply a PNG_INFO_ flag, and check info_ptr->valid before writing + * the chunk, as that will keep the code from breaking if you want to just + * write a plain PNG file. If you have long comments, I suggest writing + * them in png_write_end(), and compressing them. + */ +void PNGAPI +png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr) +{ + png_debug(1, "in png_write_info_before_PLTE"); + + if (png_ptr == NULL || info_ptr == NULL) + return; + + if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE)) + { + /* Write PNG signature */ + png_write_sig(png_ptr); + +#ifdef PNG_MNG_FEATURES_SUPPORTED + if ((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE) && \ + (png_ptr->mng_features_permitted)) + { + png_warning(png_ptr, "MNG features are not allowed in a PNG datastream"); + png_ptr->mng_features_permitted = 0; + } +#endif + + /* Write IHDR information. */ + png_write_IHDR(png_ptr, info_ptr->width, info_ptr->height, + info_ptr->bit_depth, info_ptr->color_type, info_ptr->compression_type, + info_ptr->filter_type, +#ifdef PNG_WRITE_INTERLACING_SUPPORTED + info_ptr->interlace_type); +#else + 0); +#endif + /* The rest of these check to see if the valid field has the appropriate + * flag set, and if it does, writes the chunk. + */ +#ifdef PNG_WRITE_gAMA_SUPPORTED + if (info_ptr->valid & PNG_INFO_gAMA) + png_write_gAMA_fixed(png_ptr, info_ptr->gamma); +#endif +#ifdef PNG_WRITE_sRGB_SUPPORTED + if (info_ptr->valid & PNG_INFO_sRGB) + png_write_sRGB(png_ptr, (int)info_ptr->srgb_intent); +#endif + +#ifdef PNG_WRITE_iCCP_SUPPORTED + if (info_ptr->valid & PNG_INFO_iCCP) + png_write_iCCP(png_ptr, info_ptr->iccp_name, PNG_COMPRESSION_TYPE_BASE, + (png_charp)info_ptr->iccp_profile, (int)info_ptr->iccp_proflen); +#endif +#ifdef PNG_WRITE_sBIT_SUPPORTED + if (info_ptr->valid & PNG_INFO_sBIT) + png_write_sBIT(png_ptr, &(info_ptr->sig_bit), info_ptr->color_type); +#endif +#ifdef PNG_WRITE_cHRM_SUPPORTED + if (info_ptr->valid & PNG_INFO_cHRM) + png_write_cHRM_fixed(png_ptr, + info_ptr->x_white, info_ptr->y_white, + info_ptr->x_red, info_ptr->y_red, + info_ptr->x_green, info_ptr->y_green, + info_ptr->x_blue, info_ptr->y_blue); +#endif + +#ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED + if (info_ptr->unknown_chunks_num) + { + png_unknown_chunk *up; + + png_debug(5, "writing extra chunks"); + + for (up = info_ptr->unknown_chunks; + up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num; + up++) + { + int keep = png_handle_as_unknown(png_ptr, up->name); + + if (keep != PNG_HANDLE_CHUNK_NEVER && + up->location && !(up->location & PNG_HAVE_PLTE) && + !(up->location & PNG_HAVE_IDAT) && + ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS || + (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS))) + { + if (up->size == 0) + png_warning(png_ptr, "Writing zero-length unknown chunk"); + + png_write_chunk(png_ptr, up->name, up->data, up->size); + } + } + } +#endif + png_ptr->mode |= PNG_WROTE_INFO_BEFORE_PLTE; + } +} + +void PNGAPI +png_write_info(png_structp png_ptr, png_infop info_ptr) +{ +#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED) + int i; +#endif + + png_debug(1, "in png_write_info"); + + if (png_ptr == NULL || info_ptr == NULL) + return; + + png_write_info_before_PLTE(png_ptr, info_ptr); + + if (info_ptr->valid & PNG_INFO_PLTE) + png_write_PLTE(png_ptr, info_ptr->palette, + (png_uint_32)info_ptr->num_palette); + + else if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) + png_error(png_ptr, "Valid palette required for paletted images"); + +#ifdef PNG_WRITE_tRNS_SUPPORTED + if (info_ptr->valid & PNG_INFO_tRNS) + { +#ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED + /* Invert the alpha channel (in tRNS) */ + if ((png_ptr->transformations & PNG_INVERT_ALPHA) && + info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) + { + int j; + for (j = 0; j<(int)info_ptr->num_trans; j++) + info_ptr->trans_alpha[j] = + (png_byte)(255 - info_ptr->trans_alpha[j]); + } +#endif + png_write_tRNS(png_ptr, info_ptr->trans_alpha, &(info_ptr->trans_color), + info_ptr->num_trans, info_ptr->color_type); + } +#endif +#ifdef PNG_WRITE_bKGD_SUPPORTED + if (info_ptr->valid & PNG_INFO_bKGD) + png_write_bKGD(png_ptr, &(info_ptr->background), info_ptr->color_type); +#endif + +#ifdef PNG_WRITE_hIST_SUPPORTED + if (info_ptr->valid & PNG_INFO_hIST) + png_write_hIST(png_ptr, info_ptr->hist, info_ptr->num_palette); +#endif + +#ifdef PNG_WRITE_oFFs_SUPPORTED + if (info_ptr->valid & PNG_INFO_oFFs) + png_write_oFFs(png_ptr, info_ptr->x_offset, info_ptr->y_offset, + info_ptr->offset_unit_type); +#endif + +#ifdef PNG_WRITE_pCAL_SUPPORTED + if (info_ptr->valid & PNG_INFO_pCAL) + png_write_pCAL(png_ptr, info_ptr->pcal_purpose, info_ptr->pcal_X0, + info_ptr->pcal_X1, info_ptr->pcal_type, info_ptr->pcal_nparams, + info_ptr->pcal_units, info_ptr->pcal_params); +#endif + +#ifdef PNG_WRITE_sCAL_SUPPORTED + if (info_ptr->valid & PNG_INFO_sCAL) + png_write_sCAL_s(png_ptr, (int)info_ptr->scal_unit, + info_ptr->scal_s_width, info_ptr->scal_s_height); +#endif /* sCAL */ + +#ifdef PNG_WRITE_pHYs_SUPPORTED + if (info_ptr->valid & PNG_INFO_pHYs) + png_write_pHYs(png_ptr, info_ptr->x_pixels_per_unit, + info_ptr->y_pixels_per_unit, info_ptr->phys_unit_type); +#endif /* pHYs */ + +#ifdef PNG_WRITE_tIME_SUPPORTED + if (info_ptr->valid & PNG_INFO_tIME) + { + png_write_tIME(png_ptr, &(info_ptr->mod_time)); + png_ptr->mode |= PNG_WROTE_tIME; + } +#endif /* tIME */ + +#ifdef PNG_WRITE_sPLT_SUPPORTED + if (info_ptr->valid & PNG_INFO_sPLT) + for (i = 0; i < (int)info_ptr->splt_palettes_num; i++) + png_write_sPLT(png_ptr, info_ptr->splt_palettes + i); +#endif /* sPLT */ + +#ifdef PNG_WRITE_TEXT_SUPPORTED + /* Check to see if we need to write text chunks */ + for (i = 0; i < info_ptr->num_text; i++) + { + png_debug2(2, "Writing header text chunk %d, type %d", i, + info_ptr->text[i].compression); + /* An internationalized chunk? */ + if (info_ptr->text[i].compression > 0) + { +#ifdef PNG_WRITE_iTXt_SUPPORTED + /* Write international chunk */ + png_write_iTXt(png_ptr, + info_ptr->text[i].compression, + info_ptr->text[i].key, + info_ptr->text[i].lang, + info_ptr->text[i].lang_key, + info_ptr->text[i].text); +#else + png_warning(png_ptr, "Unable to write international text"); +#endif + /* Mark this chunk as written */ + info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR; + } + + /* If we want a compressed text chunk */ + else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_zTXt) + { +#ifdef PNG_WRITE_zTXt_SUPPORTED + /* Write compressed chunk */ + png_write_zTXt(png_ptr, info_ptr->text[i].key, + info_ptr->text[i].text, 0, + info_ptr->text[i].compression); +#else + png_warning(png_ptr, "Unable to write compressed text"); +#endif + /* Mark this chunk as written */ + info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR; + } + + else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE) + { +#ifdef PNG_WRITE_tEXt_SUPPORTED + /* Write uncompressed chunk */ + png_write_tEXt(png_ptr, info_ptr->text[i].key, + info_ptr->text[i].text, + 0); + /* Mark this chunk as written */ + info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR; +#else + /* Can't get here */ + png_warning(png_ptr, "Unable to write uncompressed text"); +#endif + } + } +#endif /* tEXt */ + +#ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED + if (info_ptr->unknown_chunks_num) + { + png_unknown_chunk *up; + + png_debug(5, "writing extra chunks"); + + for (up = info_ptr->unknown_chunks; + up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num; + up++) + { + int keep = png_handle_as_unknown(png_ptr, up->name); + if (keep != PNG_HANDLE_CHUNK_NEVER && + up->location && (up->location & PNG_HAVE_PLTE) && + !(up->location & PNG_HAVE_IDAT) && + ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS || + (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS))) + { + png_write_chunk(png_ptr, up->name, up->data, up->size); + } + } + } +#endif +} + +/* Writes the end of the PNG file. If you don't want to write comments or + * time information, you can pass NULL for info. If you already wrote these + * in png_write_info(), do not write them again here. If you have long + * comments, I suggest writing them here, and compressing them. + */ +void PNGAPI +png_write_end(png_structp png_ptr, png_infop info_ptr) +{ + png_debug(1, "in png_write_end"); + + if (png_ptr == NULL) + return; + + if (!(png_ptr->mode & PNG_HAVE_IDAT)) + png_error(png_ptr, "No IDATs written into file"); + + /* See if user wants us to write information chunks */ + if (info_ptr != NULL) + { +#ifdef PNG_WRITE_TEXT_SUPPORTED + int i; /* local index variable */ +#endif +#ifdef PNG_WRITE_tIME_SUPPORTED + /* Check to see if user has supplied a time chunk */ + if ((info_ptr->valid & PNG_INFO_tIME) && + !(png_ptr->mode & PNG_WROTE_tIME)) + png_write_tIME(png_ptr, &(info_ptr->mod_time)); + +#endif +#ifdef PNG_WRITE_TEXT_SUPPORTED + /* Loop through comment chunks */ + for (i = 0; i < info_ptr->num_text; i++) + { + png_debug2(2, "Writing trailer text chunk %d, type %d", i, + info_ptr->text[i].compression); + /* An internationalized chunk? */ + if (info_ptr->text[i].compression > 0) + { +#ifdef PNG_WRITE_iTXt_SUPPORTED + /* Write international chunk */ + png_write_iTXt(png_ptr, + info_ptr->text[i].compression, + info_ptr->text[i].key, + info_ptr->text[i].lang, + info_ptr->text[i].lang_key, + info_ptr->text[i].text); +#else + png_warning(png_ptr, "Unable to write international text"); +#endif + /* Mark this chunk as written */ + info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR; + } + + else if (info_ptr->text[i].compression >= PNG_TEXT_COMPRESSION_zTXt) + { +#ifdef PNG_WRITE_zTXt_SUPPORTED + /* Write compressed chunk */ + png_write_zTXt(png_ptr, info_ptr->text[i].key, + info_ptr->text[i].text, 0, + info_ptr->text[i].compression); +#else + png_warning(png_ptr, "Unable to write compressed text"); +#endif + /* Mark this chunk as written */ + info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR; + } + + else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE) + { +#ifdef PNG_WRITE_tEXt_SUPPORTED + /* Write uncompressed chunk */ + png_write_tEXt(png_ptr, info_ptr->text[i].key, + info_ptr->text[i].text, 0); +#else + png_warning(png_ptr, "Unable to write uncompressed text"); +#endif + + /* Mark this chunk as written */ + info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR; + } + } +#endif +#ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED + if (info_ptr->unknown_chunks_num) + { + png_unknown_chunk *up; + + png_debug(5, "writing extra chunks"); + + for (up = info_ptr->unknown_chunks; + up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num; + up++) + { + int keep = png_handle_as_unknown(png_ptr, up->name); + if (keep != PNG_HANDLE_CHUNK_NEVER && + up->location && (up->location & PNG_AFTER_IDAT) && + ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS || + (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS))) + { + png_write_chunk(png_ptr, up->name, up->data, up->size); + } + } + } +#endif + } + + png_ptr->mode |= PNG_AFTER_IDAT; + + /* Write end of PNG file */ + png_write_IEND(png_ptr); + /* This flush, added in libpng-1.0.8, removed from libpng-1.0.9beta03, + * and restored again in libpng-1.2.30, may cause some applications that + * do not set png_ptr->output_flush_fn to crash. If your application + * experiences a problem, please try building libpng with + * PNG_WRITE_FLUSH_AFTER_IEND_SUPPORTED defined, and report the event to + * png-mng-implement at lists.sf.net . + */ +#ifdef PNG_WRITE_FLUSH_SUPPORTED +# ifdef PNG_WRITE_FLUSH_AFTER_IEND_SUPPORTED + png_flush(png_ptr); +# endif +#endif +} + +#ifdef PNG_CONVERT_tIME_SUPPORTED +/* "tm" structure is not supported on WindowsCE */ +void PNGAPI +png_convert_from_struct_tm(png_timep ptime, PNG_CONST struct tm FAR * ttime) +{ + png_debug(1, "in png_convert_from_struct_tm"); + + ptime->year = (png_uint_16)(1900 + ttime->tm_year); + ptime->month = (png_byte)(ttime->tm_mon + 1); + ptime->day = (png_byte)ttime->tm_mday; + ptime->hour = (png_byte)ttime->tm_hour; + ptime->minute = (png_byte)ttime->tm_min; + ptime->second = (png_byte)ttime->tm_sec; +} + +void PNGAPI +png_convert_from_time_t(png_timep ptime, time_t ttime) +{ + struct tm *tbuf; + + png_debug(1, "in png_convert_from_time_t"); + + tbuf = gmtime(&ttime); + png_convert_from_struct_tm(ptime, tbuf); +} +#endif + +/* Initialize png_ptr structure, and allocate any memory needed */ +PNG_FUNCTION(png_structp,PNGAPI +png_create_write_struct,(png_const_charp user_png_ver, png_voidp error_ptr, + png_error_ptr error_fn, png_error_ptr warn_fn),PNG_ALLOCATED) +{ +#ifdef PNG_USER_MEM_SUPPORTED + return (png_create_write_struct_2(user_png_ver, error_ptr, error_fn, + warn_fn, NULL, NULL, NULL)); +} + +/* Alternate initialize png_ptr structure, and allocate any memory needed */ +static void png_reset_filter_heuristics(png_structp png_ptr); /* forward decl */ + +PNG_FUNCTION(png_structp,PNGAPI +png_create_write_struct_2,(png_const_charp user_png_ver, png_voidp error_ptr, + png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, + png_malloc_ptr malloc_fn, png_free_ptr free_fn),PNG_ALLOCATED) +{ +#endif /* PNG_USER_MEM_SUPPORTED */ + volatile int png_cleanup_needed = 0; +#ifdef PNG_SETJMP_SUPPORTED + volatile +#endif + png_structp png_ptr; +#ifdef PNG_SETJMP_SUPPORTED +#ifdef USE_FAR_KEYWORD + jmp_buf png_jmpbuf; +#endif +#endif + int i; + + png_debug(1, "in png_create_write_struct"); + +#ifdef PNG_USER_MEM_SUPPORTED + png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG, + (png_malloc_ptr)malloc_fn, (png_voidp)mem_ptr); +#else + png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG); +#endif /* PNG_USER_MEM_SUPPORTED */ + if (png_ptr == NULL) + return (NULL); + + /* Added at libpng-1.2.6 */ +#ifdef PNG_SET_USER_LIMITS_SUPPORTED + png_ptr->user_width_max = PNG_USER_WIDTH_MAX; + png_ptr->user_height_max = PNG_USER_HEIGHT_MAX; +#endif + +#ifdef PNG_SETJMP_SUPPORTED +/* Applications that neglect to set up their own setjmp() and then + encounter a png_error() will longjmp here. Since the jmpbuf is + then meaningless we abort instead of returning. */ +#ifdef USE_FAR_KEYWORD + if (setjmp(png_jmpbuf)) +#else + if (setjmp(png_jmpbuf(png_ptr))) /* sets longjmp to match setjmp */ +#endif +#ifdef USE_FAR_KEYWORD + png_memcpy(png_jmpbuf(png_ptr), png_jmpbuf, png_sizeof(jmp_buf)); +#endif + PNG_ABORT(); +#endif + +#ifdef PNG_USER_MEM_SUPPORTED + png_set_mem_fn(png_ptr, mem_ptr, malloc_fn, free_fn); +#endif /* PNG_USER_MEM_SUPPORTED */ + png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn); + + if (user_png_ver) + { + i = 0; + do + { + if (user_png_ver[i] != png_libpng_ver[i]) + png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH; + } while (png_libpng_ver[i++]); + } + + if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH) + { + /* Libpng 0.90 and later are binary incompatible with libpng 0.89, so + * we must recompile any applications that use any older library version. + * For versions after libpng 1.0, we will be compatible, so we need + * only check the first digit. + */ + if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] || + (user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) || + (user_png_ver[0] == '0' && user_png_ver[2] < '9')) + { +#ifdef PNG_CONSOLE_IO_SUPPORTED + char msg[80]; + + if (user_png_ver) + { + png_snprintf2(msg, 80, + "Application built with libpng-%.20s" + " but running with %.20s", + user_png_ver, + png_libpng_ver); + png_warning(png_ptr, msg); + } +#else + png_warning(png_ptr, + "Incompatible libpng version in application and library"); +#endif +#ifdef PNG_ERROR_NUMBERS_SUPPORTED + png_ptr->flags = 0; +#endif + png_cleanup_needed = 1; + } + } + + /* Initialize zbuf - compression buffer */ + png_ptr->zbuf_size = PNG_ZBUF_SIZE; + + if (!png_cleanup_needed) + { + png_ptr->zbuf = (png_bytep)png_malloc_warn(png_ptr, + png_ptr->zbuf_size); + if (png_ptr->zbuf == NULL) + png_cleanup_needed = 1; + } + + if (png_cleanup_needed) + { + /* Clean up PNG structure and deallocate any memory. */ + png_free(png_ptr, png_ptr->zbuf); + png_ptr->zbuf = NULL; +#ifdef PNG_USER_MEM_SUPPORTED + png_destroy_struct_2((png_voidp)png_ptr, + (png_free_ptr)free_fn, (png_voidp)mem_ptr); +#else + png_destroy_struct((png_voidp)png_ptr); +#endif + return (NULL); + } + + png_set_write_fn(png_ptr, NULL, NULL, NULL); + +#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED + png_reset_filter_heuristics(png_ptr); +#endif + + return (png_ptr); +} + + +/* Write a few rows of image data. If the image is interlaced, + * either you will have to write the 7 sub images, or, if you + * have called png_set_interlace_handling(), you will have to + * "write" the image seven times. + */ +void PNGAPI +png_write_rows(png_structp png_ptr, png_bytepp row, + png_uint_32 num_rows) +{ + png_uint_32 i; /* row counter */ + png_bytepp rp; /* row pointer */ + + png_debug(1, "in png_write_rows"); + + if (png_ptr == NULL) + return; + + /* Loop through the rows */ + for (i = 0, rp = row; i < num_rows; i++, rp++) + { + png_write_row(png_ptr, *rp); + } +} + +/* Write the image. You only need to call this function once, even + * if you are writing an interlaced image. + */ +void PNGAPI +png_write_image(png_structp png_ptr, png_bytepp image) +{ + png_uint_32 i; /* row index */ + int pass, num_pass; /* pass variables */ + png_bytepp rp; /* points to current row */ + + if (png_ptr == NULL) + return; + + png_debug(1, "in png_write_image"); + +#ifdef PNG_WRITE_INTERLACING_SUPPORTED + /* Initialize interlace handling. If image is not interlaced, + * this will set pass to 1 + */ + num_pass = png_set_interlace_handling(png_ptr); +#else + num_pass = 1; +#endif + /* Loop through passes */ + for (pass = 0; pass < num_pass; pass++) + { + /* Loop through image */ + for (i = 0, rp = image; i < png_ptr->height; i++, rp++) + { + png_write_row(png_ptr, *rp); + } + } +} + +/* Called by user to write a row of image data */ +void PNGAPI +png_write_row(png_structp png_ptr, png_const_bytep row) +{ + if (png_ptr == NULL) + return; + + png_debug2(1, "in png_write_row (row %u, pass %d)", + png_ptr->row_number, png_ptr->pass); + + /* Initialize transformations and other stuff if first time */ + if (png_ptr->row_number == 0 && png_ptr->pass == 0) + { + /* Make sure we wrote the header info */ + if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE)) + png_error(png_ptr, + "png_write_info was never called before png_write_row"); + + /* Check for transforms that have been set but were defined out */ +#if !defined(PNG_WRITE_INVERT_SUPPORTED) && defined(PNG_READ_INVERT_SUPPORTED) + if (png_ptr->transformations & PNG_INVERT_MONO) + png_warning(png_ptr, "PNG_WRITE_INVERT_SUPPORTED is not defined"); +#endif + +#if !defined(PNG_WRITE_FILLER_SUPPORTED) && defined(PNG_READ_FILLER_SUPPORTED) + if (png_ptr->transformations & PNG_FILLER) + png_warning(png_ptr, "PNG_WRITE_FILLER_SUPPORTED is not defined"); +#endif +#if !defined(PNG_WRITE_PACKSWAP_SUPPORTED) && \ + defined(PNG_READ_PACKSWAP_SUPPORTED) + if (png_ptr->transformations & PNG_PACKSWAP) + png_warning(png_ptr, + "PNG_WRITE_PACKSWAP_SUPPORTED is not defined"); +#endif + +#if !defined(PNG_WRITE_PACK_SUPPORTED) && defined(PNG_READ_PACK_SUPPORTED) + if (png_ptr->transformations & PNG_PACK) + png_warning(png_ptr, "PNG_WRITE_PACK_SUPPORTED is not defined"); +#endif + +#if !defined(PNG_WRITE_SHIFT_SUPPORTED) && defined(PNG_READ_SHIFT_SUPPORTED) + if (png_ptr->transformations & PNG_SHIFT) + png_warning(png_ptr, "PNG_WRITE_SHIFT_SUPPORTED is not defined"); +#endif + +#if !defined(PNG_WRITE_BGR_SUPPORTED) && defined(PNG_READ_BGR_SUPPORTED) + if (png_ptr->transformations & PNG_BGR) + png_warning(png_ptr, "PNG_WRITE_BGR_SUPPORTED is not defined"); +#endif + +#if !defined(PNG_WRITE_SWAP_SUPPORTED) && defined(PNG_READ_SWAP_SUPPORTED) + if (png_ptr->transformations & PNG_SWAP_BYTES) + png_warning(png_ptr, "PNG_WRITE_SWAP_SUPPORTED is not defined"); +#endif + + png_write_start_row(png_ptr); + } + +#ifdef PNG_WRITE_INTERLACING_SUPPORTED + /* If interlaced and not interested in row, return */ + if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE)) + { + switch (png_ptr->pass) + { + case 0: + if (png_ptr->row_number & 0x07) + { + png_write_finish_row(png_ptr); + return; + } + break; + + case 1: + if ((png_ptr->row_number & 0x07) || png_ptr->width < 5) + { + png_write_finish_row(png_ptr); + return; + } + break; + + case 2: + if ((png_ptr->row_number & 0x07) != 4) + { + png_write_finish_row(png_ptr); + return; + } + break; + + case 3: + if ((png_ptr->row_number & 0x03) || png_ptr->width < 3) + { + png_write_finish_row(png_ptr); + return; + } + break; + + case 4: + if ((png_ptr->row_number & 0x03) != 2) + { + png_write_finish_row(png_ptr); + return; + } + break; + + case 5: + if ((png_ptr->row_number & 0x01) || png_ptr->width < 2) + { + png_write_finish_row(png_ptr); + return; + } + break; + + case 6: + if (!(png_ptr->row_number & 0x01)) + { + png_write_finish_row(png_ptr); + return; + } + break; + + default: /* error: ignore it */ + break; + } + } +#endif + + /* Set up row info for transformations */ + png_ptr->row_info.color_type = png_ptr->color_type; + png_ptr->row_info.width = png_ptr->usr_width; + png_ptr->row_info.channels = png_ptr->usr_channels; + png_ptr->row_info.bit_depth = png_ptr->usr_bit_depth; + png_ptr->row_info.pixel_depth = (png_byte)(png_ptr->row_info.bit_depth * + png_ptr->row_info.channels); + + png_ptr->row_info.rowbytes = PNG_ROWBYTES(png_ptr->row_info.pixel_depth, + png_ptr->row_info.width); + + png_debug1(3, "row_info->color_type = %d", png_ptr->row_info.color_type); + png_debug1(3, "row_info->width = %u", png_ptr->row_info.width); + png_debug1(3, "row_info->channels = %d", png_ptr->row_info.channels); + png_debug1(3, "row_info->bit_depth = %d", png_ptr->row_info.bit_depth); + png_debug1(3, "row_info->pixel_depth = %d", png_ptr->row_info.pixel_depth); + png_debug1(3, "row_info->rowbytes = %lu", + (unsigned long)png_ptr->row_info.rowbytes); + + /* Copy user's row into buffer, leaving room for filter byte. */ + png_memcpy(png_ptr->row_buf + 1, row, png_ptr->row_info.rowbytes); + +#ifdef PNG_WRITE_INTERLACING_SUPPORTED + /* Handle interlacing */ + if (png_ptr->interlaced && png_ptr->pass < 6 && + (png_ptr->transformations & PNG_INTERLACE)) + { + png_do_write_interlace(&(png_ptr->row_info), + png_ptr->row_buf + 1, png_ptr->pass); + /* This should always get caught above, but still ... */ + if (!(png_ptr->row_info.width)) + { + png_write_finish_row(png_ptr); + return; + } + } +#endif + + /* Handle other transformations */ + if (png_ptr->transformations) + png_do_write_transformations(png_ptr); + +#ifdef PNG_MNG_FEATURES_SUPPORTED + /* Write filter_method 64 (intrapixel differencing) only if + * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and + * 2. Libpng did not write a PNG signature (this filter_method is only + * used in PNG datastreams that are embedded in MNG datastreams) and + * 3. The application called png_permit_mng_features with a mask that + * included PNG_FLAG_MNG_FILTER_64 and + * 4. The filter_method is 64 and + * 5. The color_type is RGB or RGBA + */ + if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) && + (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING)) + { + /* Intrapixel differencing */ + png_do_write_intrapixel(&(png_ptr->row_info), png_ptr->row_buf + 1); + } +#endif + + /* Find a filter if necessary, filter the row and write it out. */ + png_write_find_filter(png_ptr, &(png_ptr->row_info)); + + if (png_ptr->write_row_fn != NULL) + (*(png_ptr->write_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass); +} + +#ifdef PNG_WRITE_FLUSH_SUPPORTED +/* Set the automatic flush interval or 0 to turn flushing off */ +void PNGAPI +png_set_flush(png_structp png_ptr, int nrows) +{ + png_debug(1, "in png_set_flush"); + + if (png_ptr == NULL) + return; + + png_ptr->flush_dist = (nrows < 0 ? 0 : nrows); +} + +/* Flush the current output buffers now */ +void PNGAPI +png_write_flush(png_structp png_ptr) +{ + int wrote_IDAT; + + png_debug(1, "in png_write_flush"); + + if (png_ptr == NULL) + return; + + /* We have already written out all of the data */ + if (png_ptr->row_number >= png_ptr->num_rows) + return; + + do + { + int ret; + + /* Compress the data */ + ret = deflate(&png_ptr->zstream, Z_SYNC_FLUSH); + wrote_IDAT = 0; + + /* Check for compression errors */ + if (ret != Z_OK) + { + if (png_ptr->zstream.msg != NULL) + png_error(png_ptr, png_ptr->zstream.msg); + + else + png_error(png_ptr, "zlib error"); + } + + if (!(png_ptr->zstream.avail_out)) + { + /* Write the IDAT and reset the zlib output buffer */ + png_write_IDAT(png_ptr, png_ptr->zbuf, png_ptr->zbuf_size); + png_ptr->zstream.next_out = png_ptr->zbuf; + png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; + wrote_IDAT = 1; + } + } while (wrote_IDAT == 1); + + /* If there is any data left to be output, write it into a new IDAT */ + if (png_ptr->zbuf_size != png_ptr->zstream.avail_out) + { + /* Write the IDAT and reset the zlib output buffer */ + png_write_IDAT(png_ptr, png_ptr->zbuf, + png_ptr->zbuf_size - png_ptr->zstream.avail_out); + png_ptr->zstream.next_out = png_ptr->zbuf; + png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; + } + png_ptr->flush_rows = 0; + png_flush(png_ptr); +} +#endif /* PNG_WRITE_FLUSH_SUPPORTED */ + +/* Free all memory used by the write */ +void PNGAPI +png_destroy_write_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr) +{ + png_structp png_ptr = NULL; + png_infop info_ptr = NULL; +#ifdef PNG_USER_MEM_SUPPORTED + png_free_ptr free_fn = NULL; + png_voidp mem_ptr = NULL; +#endif + + png_debug(1, "in png_destroy_write_struct"); + + if (png_ptr_ptr != NULL) + { + png_ptr = *png_ptr_ptr; +#ifdef PNG_USER_MEM_SUPPORTED + free_fn = png_ptr->free_fn; + mem_ptr = png_ptr->mem_ptr; +#endif + } + +#ifdef PNG_USER_MEM_SUPPORTED + if (png_ptr != NULL) + { + free_fn = png_ptr->free_fn; + mem_ptr = png_ptr->mem_ptr; + } +#endif + + if (info_ptr_ptr != NULL) + info_ptr = *info_ptr_ptr; + + if (info_ptr != NULL) + { + if (png_ptr != NULL) + { + png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1); + +#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED + if (png_ptr->num_chunk_list) + { + png_free(png_ptr, png_ptr->chunk_list); + png_ptr->num_chunk_list = 0; + } +#endif + } + +#ifdef PNG_USER_MEM_SUPPORTED + png_destroy_struct_2((png_voidp)info_ptr, (png_free_ptr)free_fn, + (png_voidp)mem_ptr); +#else + png_destroy_struct((png_voidp)info_ptr); +#endif + *info_ptr_ptr = NULL; + } + + if (png_ptr != NULL) + { + png_write_destroy(png_ptr); +#ifdef PNG_USER_MEM_SUPPORTED + png_destroy_struct_2((png_voidp)png_ptr, (png_free_ptr)free_fn, + (png_voidp)mem_ptr); +#else + png_destroy_struct((png_voidp)png_ptr); +#endif + *png_ptr_ptr = NULL; + } +} + + +/* Free any memory used in png_ptr struct (old method) */ +void /* PRIVATE */ +png_write_destroy(png_structp png_ptr) +{ +#ifdef PNG_SETJMP_SUPPORTED + jmp_buf tmp_jmp; /* Save jump buffer */ +#endif + png_error_ptr error_fn; + png_error_ptr warning_fn; + png_voidp error_ptr; +#ifdef PNG_USER_MEM_SUPPORTED + png_free_ptr free_fn; +#endif + + png_debug(1, "in png_write_destroy"); + + /* Free any memory zlib uses */ + deflateEnd(&png_ptr->zstream); + + /* Free our memory. png_free checks NULL for us. */ + png_free(png_ptr, png_ptr->zbuf); + png_free(png_ptr, png_ptr->row_buf); +#ifdef PNG_WRITE_FILTER_SUPPORTED + png_free(png_ptr, png_ptr->prev_row); + png_free(png_ptr, png_ptr->sub_row); + png_free(png_ptr, png_ptr->up_row); + png_free(png_ptr, png_ptr->avg_row); + png_free(png_ptr, png_ptr->paeth_row); +#endif + +#ifdef PNG_TIME_RFC1123_SUPPORTED + png_free(png_ptr, png_ptr->time_buffer); +#endif + +#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED + /* Use this to save a little code space, it doesn't free the filter_costs */ + png_reset_filter_heuristics(png_ptr); + png_free(png_ptr, png_ptr->filter_costs); + png_free(png_ptr, png_ptr->inv_filter_costs); +#endif + +#ifdef PNG_SETJMP_SUPPORTED + /* Reset structure */ + png_memcpy(tmp_jmp, png_ptr->png_jmpbuf, png_sizeof(jmp_buf)); +#endif + + error_fn = png_ptr->error_fn; + warning_fn = png_ptr->warning_fn; + error_ptr = png_ptr->error_ptr; +#ifdef PNG_USER_MEM_SUPPORTED + free_fn = png_ptr->free_fn; +#endif + + png_memset(png_ptr, 0, png_sizeof(png_struct)); + + png_ptr->error_fn = error_fn; + png_ptr->warning_fn = warning_fn; + png_ptr->error_ptr = error_ptr; +#ifdef PNG_USER_MEM_SUPPORTED + png_ptr->free_fn = free_fn; +#endif + +#ifdef PNG_SETJMP_SUPPORTED + png_memcpy(png_ptr->png_jmpbuf, tmp_jmp, png_sizeof(jmp_buf)); +#endif +} + +/* Allow the application to select one or more row filters to use. */ +void PNGAPI +png_set_filter(png_structp png_ptr, int method, int filters) +{ + png_debug(1, "in png_set_filter"); + + if (png_ptr == NULL) + return; + +#ifdef PNG_MNG_FEATURES_SUPPORTED + if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) && + (method == PNG_INTRAPIXEL_DIFFERENCING)) + method = PNG_FILTER_TYPE_BASE; + +#endif + if (method == PNG_FILTER_TYPE_BASE) + { + switch (filters & (PNG_ALL_FILTERS | 0x07)) + { +#ifdef PNG_WRITE_FILTER_SUPPORTED + case 5: + case 6: + case 7: png_warning(png_ptr, "Unknown row filter for method 0"); +#endif /* PNG_WRITE_FILTER_SUPPORTED */ + case PNG_FILTER_VALUE_NONE: + png_ptr->do_filter = PNG_FILTER_NONE; break; + +#ifdef PNG_WRITE_FILTER_SUPPORTED + case PNG_FILTER_VALUE_SUB: + png_ptr->do_filter = PNG_FILTER_SUB; break; + + case PNG_FILTER_VALUE_UP: + png_ptr->do_filter = PNG_FILTER_UP; break; + + case PNG_FILTER_VALUE_AVG: + png_ptr->do_filter = PNG_FILTER_AVG; break; + + case PNG_FILTER_VALUE_PAETH: + png_ptr->do_filter = PNG_FILTER_PAETH; break; + + default: + png_ptr->do_filter = (png_byte)filters; break; +#else + default: + png_warning(png_ptr, "Unknown row filter for method 0"); +#endif /* PNG_WRITE_FILTER_SUPPORTED */ + } + + /* If we have allocated the row_buf, this means we have already started + * with the image and we should have allocated all of the filter buffers + * that have been selected. If prev_row isn't already allocated, then + * it is too late to start using the filters that need it, since we + * will be missing the data in the previous row. If an application + * wants to start and stop using particular filters during compression, + * it should start out with all of the filters, and then add and + * remove them after the start of compression. + */ + if (png_ptr->row_buf != NULL) + { +#ifdef PNG_WRITE_FILTER_SUPPORTED + if ((png_ptr->do_filter & PNG_FILTER_SUB) && png_ptr->sub_row == NULL) + { + png_ptr->sub_row = (png_bytep)png_malloc(png_ptr, + (png_ptr->rowbytes + 1)); + png_ptr->sub_row[0] = PNG_FILTER_VALUE_SUB; + } + + if ((png_ptr->do_filter & PNG_FILTER_UP) && png_ptr->up_row == NULL) + { + if (png_ptr->prev_row == NULL) + { + png_warning(png_ptr, "Can't add Up filter after starting"); + png_ptr->do_filter = (png_byte)(png_ptr->do_filter & + ~PNG_FILTER_UP); + } + + else + { + png_ptr->up_row = (png_bytep)png_malloc(png_ptr, + (png_ptr->rowbytes + 1)); + png_ptr->up_row[0] = PNG_FILTER_VALUE_UP; + } + } + + if ((png_ptr->do_filter & PNG_FILTER_AVG) && png_ptr->avg_row == NULL) + { + if (png_ptr->prev_row == NULL) + { + png_warning(png_ptr, "Can't add Average filter after starting"); + png_ptr->do_filter = (png_byte)(png_ptr->do_filter & + ~PNG_FILTER_AVG); + } + + else + { + png_ptr->avg_row = (png_bytep)png_malloc(png_ptr, + (png_ptr->rowbytes + 1)); + png_ptr->avg_row[0] = PNG_FILTER_VALUE_AVG; + } + } + + if ((png_ptr->do_filter & PNG_FILTER_PAETH) && + png_ptr->paeth_row == NULL) + { + if (png_ptr->prev_row == NULL) + { + png_warning(png_ptr, "Can't add Paeth filter after starting"); + png_ptr->do_filter &= (png_byte)(~PNG_FILTER_PAETH); + } + + else + { + png_ptr->paeth_row = (png_bytep)png_malloc(png_ptr, + (png_ptr->rowbytes + 1)); + png_ptr->paeth_row[0] = PNG_FILTER_VALUE_PAETH; + } + } + + if (png_ptr->do_filter == PNG_NO_FILTERS) +#endif /* PNG_WRITE_FILTER_SUPPORTED */ + png_ptr->do_filter = PNG_FILTER_NONE; + } + } + else + png_error(png_ptr, "Unknown custom filter method"); +} + +/* This allows us to influence the way in which libpng chooses the "best" + * filter for the current scanline. While the "minimum-sum-of-absolute- + * differences metric is relatively fast and effective, there is some + * question as to whether it can be improved upon by trying to keep the + * filtered data going to zlib more consistent, hopefully resulting in + * better compression. + */ +#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED /* GRR 970116 */ +/* Conveneince reset API. */ +static void +png_reset_filter_heuristics(png_structp png_ptr) +{ + /* Clear out any old values in the 'weights' - this must be done because if + * the app calls set_filter_heuristics multiple times with different + * 'num_weights' values we would otherwise potentially have wrong sized + * arrays. + */ + png_ptr->num_prev_filters = 0; + png_ptr->heuristic_method = PNG_FILTER_HEURISTIC_UNWEIGHTED; + if (png_ptr->prev_filters != NULL) + { + png_bytep old = png_ptr->prev_filters; + png_ptr->prev_filters = NULL; + png_free(png_ptr, old); + } + if (png_ptr->filter_weights != NULL) + { + png_uint_16p old = png_ptr->filter_weights; + png_ptr->filter_weights = NULL; + png_free(png_ptr, old); + } + + if (png_ptr->inv_filter_weights != NULL) + { + png_uint_16p old = png_ptr->inv_filter_weights; + png_ptr->inv_filter_weights = NULL; + png_free(png_ptr, old); + } + + /* Leave the filter_costs - this array is fixed size. */ +} + +static int +png_init_filter_heuristics(png_structp png_ptr, int heuristic_method, + int num_weights) +{ + if (png_ptr == NULL) + return 0; + + /* Clear out the arrays */ + png_reset_filter_heuristics(png_ptr); + + /* Check arguments; the 'reset' function makes the correct settings for the + * unweighted case, but we must handle the weight case by initializing the + * arrays for the caller. + */ + if (heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED) + { + int i; + + if (num_weights > 0) + { + png_ptr->prev_filters = (png_bytep)png_malloc(png_ptr, + (png_uint_32)(png_sizeof(png_byte) * num_weights)); + + /* To make sure that the weighting starts out fairly */ + for (i = 0; i < num_weights; i++) + { + png_ptr->prev_filters[i] = 255; + } + + png_ptr->filter_weights = (png_uint_16p)png_malloc(png_ptr, + (png_uint_32)(png_sizeof(png_uint_16) * num_weights)); + + png_ptr->inv_filter_weights = (png_uint_16p)png_malloc(png_ptr, + (png_uint_32)(png_sizeof(png_uint_16) * num_weights)); + + for (i = 0; i < num_weights; i++) + { + png_ptr->inv_filter_weights[i] = + png_ptr->filter_weights[i] = PNG_WEIGHT_FACTOR; + } + + /* Safe to set this now */ + png_ptr->num_prev_filters = (png_byte)num_weights; + } + + /* If, in the future, there are other filter methods, this would + * need to be based on png_ptr->filter. + */ + if (png_ptr->filter_costs == NULL) + { + png_ptr->filter_costs = (png_uint_16p)png_malloc(png_ptr, + (png_uint_32)(png_sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST)); + + png_ptr->inv_filter_costs = (png_uint_16p)png_malloc(png_ptr, + (png_uint_32)(png_sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST)); + } + + for (i = 0; i < PNG_FILTER_VALUE_LAST; i++) + { + png_ptr->inv_filter_costs[i] = + png_ptr->filter_costs[i] = PNG_COST_FACTOR; + } + + /* All the arrays are inited, safe to set this: */ + png_ptr->heuristic_method = PNG_FILTER_HEURISTIC_WEIGHTED; + + /* Return the 'ok' code. */ + return 1; + } + else if (heuristic_method == PNG_FILTER_HEURISTIC_DEFAULT || + heuristic_method == PNG_FILTER_HEURISTIC_UNWEIGHTED) + { + return 1; + } + else + { + png_warning(png_ptr, "Unknown filter heuristic method"); + return 0; + } +} + +/* Provide floating and fixed point APIs */ +#ifdef PNG_FLOATING_POINT_SUPPORTED +void PNGAPI +png_set_filter_heuristics(png_structp png_ptr, int heuristic_method, + int num_weights, png_const_doublep filter_weights, + png_const_doublep filter_costs) +{ + png_debug(1, "in png_set_filter_heuristics"); + + /* The internal API allocates all the arrays and ensures that the elements of + * those arrays are set to the default value. + */ + if (!png_init_filter_heuristics(png_ptr, heuristic_method, num_weights)) + return; + + /* If using the weighted method copy in the weights. */ + if (heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED) + { + int i; + for (i = 0; i < num_weights; i++) + { + if (filter_weights[i] <= 0.0) + { + png_ptr->inv_filter_weights[i] = + png_ptr->filter_weights[i] = PNG_WEIGHT_FACTOR; + } + + else + { + png_ptr->inv_filter_weights[i] = + (png_uint_16)(PNG_WEIGHT_FACTOR*filter_weights[i]+.5); + + png_ptr->filter_weights[i] = + (png_uint_16)(PNG_WEIGHT_FACTOR/filter_weights[i]+.5); + } + } + + /* Here is where we set the relative costs of the different filters. We + * should take the desired compression level into account when setting + * the costs, so that Paeth, for instance, has a high relative cost at low + * compression levels, while it has a lower relative cost at higher + * compression settings. The filter types are in order of increasing + * relative cost, so it would be possible to do this with an algorithm. + */ + for (i = 0; i < PNG_FILTER_VALUE_LAST; i++) if (filter_costs[i] >= 1.0) + { + png_ptr->inv_filter_costs[i] = + (png_uint_16)(PNG_COST_FACTOR / filter_costs[i] + .5); + + png_ptr->filter_costs[i] = + (png_uint_16)(PNG_COST_FACTOR * filter_costs[i] + .5); + } + } +} +#endif /* FLOATING_POINT */ + +#ifdef PNG_FIXED_POINT_SUPPORTED +void PNGAPI +png_set_filter_heuristics_fixed(png_structp png_ptr, int heuristic_method, + int num_weights, png_const_fixed_point_p filter_weights, + png_const_fixed_point_p filter_costs) +{ + png_debug(1, "in png_set_filter_heuristics_fixed"); + + /* The internal API allocates all the arrays and ensures that the elements of + * those arrays are set to the default value. + */ + if (!png_init_filter_heuristics(png_ptr, heuristic_method, num_weights)) + return; + + /* If using the weighted method copy in the weights. */ + if (heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED) + { + int i; + for (i = 0; i < num_weights; i++) + { + if (filter_weights[i] <= 0) + { + png_ptr->inv_filter_weights[i] = + png_ptr->filter_weights[i] = PNG_WEIGHT_FACTOR; + } + + else + { + png_ptr->inv_filter_weights[i] = (png_uint_16) + ((PNG_WEIGHT_FACTOR*filter_weights[i]+PNG_FP_HALF)/PNG_FP_1); + + png_ptr->filter_weights[i] = (png_uint_16)((PNG_WEIGHT_FACTOR* + PNG_FP_1+(filter_weights[i]/2))/filter_weights[i]); + } + } + + /* Here is where we set the relative costs of the different filters. We + * should take the desired compression level into account when setting + * the costs, so that Paeth, for instance, has a high relative cost at low + * compression levels, while it has a lower relative cost at higher + * compression settings. The filter types are in order of increasing + * relative cost, so it would be possible to do this with an algorithm. + */ + for (i = 0; i < PNG_FILTER_VALUE_LAST; i++) + if (filter_costs[i] >= PNG_FP_1) + { + png_uint_32 tmp; + + /* Use a 32 bit unsigned temporary here because otherwise the + * intermediate value will be a 32 bit *signed* integer (ANSI rules) + * and this will get the wrong answer on division. + */ + tmp = PNG_COST_FACTOR*PNG_FP_1 + (filter_costs[i]/2); + tmp /= filter_costs[i]; + + png_ptr->inv_filter_costs[i] = (png_uint_16)tmp; + + tmp = PNG_COST_FACTOR * filter_costs[i] + PNG_FP_HALF; + tmp /= PNG_FP_1; + + png_ptr->filter_costs[i] = (png_uint_16)tmp; + } + } +} +#endif /* FIXED_POINT */ +#endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */ + +void PNGAPI +png_set_compression_level(png_structp png_ptr, int level) +{ + png_debug(1, "in png_set_compression_level"); + + if (png_ptr == NULL) + return; + + png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_LEVEL; + png_ptr->zlib_level = level; +} + +void PNGAPI +png_set_compression_mem_level(png_structp png_ptr, int mem_level) +{ + png_debug(1, "in png_set_compression_mem_level"); + + if (png_ptr == NULL) + return; + + png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL; + png_ptr->zlib_mem_level = mem_level; +} + +void PNGAPI +png_set_compression_strategy(png_structp png_ptr, int strategy) +{ + png_debug(1, "in png_set_compression_strategy"); + + if (png_ptr == NULL) + return; + + png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_STRATEGY; + png_ptr->zlib_strategy = strategy; +} + +void PNGAPI +png_set_compression_window_bits(png_structp png_ptr, int window_bits) +{ + if (png_ptr == NULL) + return; + + if (window_bits > 15) + png_warning(png_ptr, "Only compression windows <= 32k supported by PNG"); + + else if (window_bits < 8) + png_warning(png_ptr, "Only compression windows >= 256 supported by PNG"); + +#ifndef WBITS_8_OK + /* Avoid libpng bug with 256-byte windows */ + if (window_bits == 8) + { + png_warning(png_ptr, "Compression window is being reset to 512"); + window_bits = 9; + } + +#endif + png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS; + png_ptr->zlib_window_bits = window_bits; +} + +void PNGAPI +png_set_compression_method(png_structp png_ptr, int method) +{ + png_debug(1, "in png_set_compression_method"); + + if (png_ptr == NULL) + return; + + if (method != 8) + png_warning(png_ptr, "Only compression method 8 is supported by PNG"); + + png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_METHOD; + png_ptr->zlib_method = method; +} + +void PNGAPI +png_set_write_status_fn(png_structp png_ptr, png_write_status_ptr write_row_fn) +{ + if (png_ptr == NULL) + return; + + png_ptr->write_row_fn = write_row_fn; +} + +#ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED +void PNGAPI +png_set_write_user_transform_fn(png_structp png_ptr, png_user_transform_ptr + write_user_transform_fn) +{ + png_debug(1, "in png_set_write_user_transform_fn"); + + if (png_ptr == NULL) + return; + + png_ptr->transformations |= PNG_USER_TRANSFORM; + png_ptr->write_user_transform_fn = write_user_transform_fn; +} +#endif + + +#ifdef PNG_INFO_IMAGE_SUPPORTED +void PNGAPI +png_write_png(png_structp png_ptr, png_infop info_ptr, + int transforms, voidp params) +{ + if (png_ptr == NULL || info_ptr == NULL) + return; + + /* Write the file header information. */ + png_write_info(png_ptr, info_ptr); + + /* ------ these transformations don't touch the info structure ------- */ + +#ifdef PNG_WRITE_INVERT_SUPPORTED + /* Invert monochrome pixels */ + if (transforms & PNG_TRANSFORM_INVERT_MONO) + png_set_invert_mono(png_ptr); +#endif + +#ifdef PNG_WRITE_SHIFT_SUPPORTED + /* Shift the pixels up to a legal bit depth and fill in + * as appropriate to correctly scale the image. + */ + if ((transforms & PNG_TRANSFORM_SHIFT) + && (info_ptr->valid & PNG_INFO_sBIT)) + png_set_shift(png_ptr, &info_ptr->sig_bit); +#endif + +#ifdef PNG_WRITE_PACK_SUPPORTED + /* Pack pixels into bytes */ + if (transforms & PNG_TRANSFORM_PACKING) + png_set_packing(png_ptr); +#endif + +#ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED + /* Swap location of alpha bytes from ARGB to RGBA */ + if (transforms & PNG_TRANSFORM_SWAP_ALPHA) + png_set_swap_alpha(png_ptr); +#endif + +#ifdef PNG_WRITE_FILLER_SUPPORTED + /* Pack XRGB/RGBX/ARGB/RGBA into * RGB (4 channels -> 3 channels) */ + if (transforms & PNG_TRANSFORM_STRIP_FILLER_AFTER) + png_set_filler(png_ptr, 0, PNG_FILLER_AFTER); + + else if (transforms & PNG_TRANSFORM_STRIP_FILLER_BEFORE) + png_set_filler(png_ptr, 0, PNG_FILLER_BEFORE); +#endif + +#ifdef PNG_WRITE_BGR_SUPPORTED + /* Flip BGR pixels to RGB */ + if (transforms & PNG_TRANSFORM_BGR) + png_set_bgr(png_ptr); +#endif + +#ifdef PNG_WRITE_SWAP_SUPPORTED + /* Swap bytes of 16-bit files to most significant byte first */ + if (transforms & PNG_TRANSFORM_SWAP_ENDIAN) + png_set_swap(png_ptr); +#endif + +#ifdef PNG_WRITE_PACKSWAP_SUPPORTED + /* Swap bits of 1, 2, 4 bit packed pixel formats */ + if (transforms & PNG_TRANSFORM_PACKSWAP) + png_set_packswap(png_ptr); +#endif + +#ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED + /* Invert the alpha channel from opacity to transparency */ + if (transforms & PNG_TRANSFORM_INVERT_ALPHA) + png_set_invert_alpha(png_ptr); +#endif + + /* ----------------------- end of transformations ------------------- */ + + /* Write the bits */ + if (info_ptr->valid & PNG_INFO_IDAT) + png_write_image(png_ptr, info_ptr->row_pointers); + + /* It is REQUIRED to call this to finish writing the rest of the file */ + png_write_end(png_ptr, info_ptr); + + PNG_UNUSED(transforms) /* Quiet compiler warnings */ + PNG_UNUSED(params) +} +#endif +#endif /* PNG_WRITE_SUPPORTED */ diff --git a/programs/develop/libraries/libpng/pngwtran.c b/programs/develop/libraries/libpng/pngwtran.c new file mode 100644 index 0000000000..115ca37212 --- /dev/null +++ b/programs/develop/libraries/libpng/pngwtran.c @@ -0,0 +1,631 @@ + +/* pngwtran.c - transforms the data in a row for PNG writers + * + * Last changed in libpng 1.5.0 [January 6, 2011] + * Copyright (c) 1998-2011 Glenn Randers-Pehrson + * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) + * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) + * + * This code is released under the libpng license. + * For conditions of distribution and use, see the disclaimer + * and license in png.h + */ + +#include "pngpriv.h" + +#ifdef PNG_WRITE_SUPPORTED + +/* Transform the data according to the user's wishes. The order of + * transformations is significant. + */ +void /* PRIVATE */ +png_do_write_transformations(png_structp png_ptr) +{ + png_debug(1, "in png_do_write_transformations"); + + if (png_ptr == NULL) + return; + +#ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED + if (png_ptr->transformations & PNG_USER_TRANSFORM) + if (png_ptr->write_user_transform_fn != NULL) + (*(png_ptr->write_user_transform_fn)) /* User write transform + function */ + (png_ptr, /* png_ptr */ + &(png_ptr->row_info), /* row_info: */ + /* png_uint_32 width; width of row */ + /* png_size_t rowbytes; number of bytes in row */ + /* png_byte color_type; color type of pixels */ + /* png_byte bit_depth; bit depth of samples */ + /* png_byte channels; number of channels (1-4) */ + /* png_byte pixel_depth; bits per pixel (depth*channels) */ + png_ptr->row_buf + 1); /* start of pixel data for row */ +#endif + +#ifdef PNG_WRITE_FILLER_SUPPORTED + if (png_ptr->transformations & PNG_FILLER) + png_do_strip_filler(&(png_ptr->row_info), png_ptr->row_buf + 1, + png_ptr->flags); +#endif + +#ifdef PNG_WRITE_PACKSWAP_SUPPORTED + if (png_ptr->transformations & PNG_PACKSWAP) + png_do_packswap(&(png_ptr->row_info), png_ptr->row_buf + 1); +#endif + +#ifdef PNG_WRITE_PACK_SUPPORTED + if (png_ptr->transformations & PNG_PACK) + png_do_pack(&(png_ptr->row_info), png_ptr->row_buf + 1, + (png_uint_32)png_ptr->bit_depth); +#endif + +#ifdef PNG_WRITE_SWAP_SUPPORTED + if (png_ptr->transformations & PNG_SWAP_BYTES) + png_do_swap(&(png_ptr->row_info), png_ptr->row_buf + 1); +#endif + +#ifdef PNG_WRITE_SHIFT_SUPPORTED + if (png_ptr->transformations & PNG_SHIFT) + png_do_shift(&(png_ptr->row_info), png_ptr->row_buf + 1, + &(png_ptr->shift)); +#endif + +#ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED + if (png_ptr->transformations & PNG_SWAP_ALPHA) + png_do_write_swap_alpha(&(png_ptr->row_info), png_ptr->row_buf + 1); +#endif + +#ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED + if (png_ptr->transformations & PNG_INVERT_ALPHA) + png_do_write_invert_alpha(&(png_ptr->row_info), png_ptr->row_buf + 1); +#endif + +#ifdef PNG_WRITE_BGR_SUPPORTED + if (png_ptr->transformations & PNG_BGR) + png_do_bgr(&(png_ptr->row_info), png_ptr->row_buf + 1); +#endif + +#ifdef PNG_WRITE_INVERT_SUPPORTED + if (png_ptr->transformations & PNG_INVERT_MONO) + png_do_invert(&(png_ptr->row_info), png_ptr->row_buf + 1); +#endif +} + +#ifdef PNG_WRITE_PACK_SUPPORTED +/* Pack pixels into bytes. Pass the true bit depth in bit_depth. The + * row_info bit depth should be 8 (one pixel per byte). The channels + * should be 1 (this only happens on grayscale and paletted images). + */ +void /* PRIVATE */ +png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth) +{ + png_debug(1, "in png_do_pack"); + + if (row_info->bit_depth == 8 && + row_info->channels == 1) + { + switch ((int)bit_depth) + { + case 1: + { + png_bytep sp, dp; + int mask, v; + png_uint_32 i; + png_uint_32 row_width = row_info->width; + + sp = row; + dp = row; + mask = 0x80; + v = 0; + + for (i = 0; i < row_width; i++) + { + if (*sp != 0) + v |= mask; + + sp++; + + if (mask > 1) + mask >>= 1; + + else + { + mask = 0x80; + *dp = (png_byte)v; + dp++; + v = 0; + } + } + + if (mask != 0x80) + *dp = (png_byte)v; + + break; + } + + case 2: + { + png_bytep sp, dp; + int shift, v; + png_uint_32 i; + png_uint_32 row_width = row_info->width; + + sp = row; + dp = row; + shift = 6; + v = 0; + + for (i = 0; i < row_width; i++) + { + png_byte value; + + value = (png_byte)(*sp & 0x03); + v |= (value << shift); + + if (shift == 0) + { + shift = 6; + *dp = (png_byte)v; + dp++; + v = 0; + } + + else + shift -= 2; + + sp++; + } + + if (shift != 6) + *dp = (png_byte)v; + + break; + } + + case 4: + { + png_bytep sp, dp; + int shift, v; + png_uint_32 i; + png_uint_32 row_width = row_info->width; + + sp = row; + dp = row; + shift = 4; + v = 0; + + for (i = 0; i < row_width; i++) + { + png_byte value; + + value = (png_byte)(*sp & 0x0f); + v |= (value << shift); + + if (shift == 0) + { + shift = 4; + *dp = (png_byte)v; + dp++; + v = 0; + } + + else + shift -= 4; + + sp++; + } + + if (shift != 4) + *dp = (png_byte)v; + + break; + } + + default: + break; + } + + row_info->bit_depth = (png_byte)bit_depth; + row_info->pixel_depth = (png_byte)(bit_depth * row_info->channels); + row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, + row_info->width); + } +} +#endif + +#ifdef PNG_WRITE_SHIFT_SUPPORTED +/* Shift pixel values to take advantage of whole range. Pass the + * true number of bits in bit_depth. The row should be packed + * according to row_info->bit_depth. Thus, if you had a row of + * bit depth 4, but the pixels only had values from 0 to 7, you + * would pass 3 as bit_depth, and this routine would translate the + * data to 0 to 15. + */ +void /* PRIVATE */ +png_do_shift(png_row_infop row_info, png_bytep row, + png_const_color_8p bit_depth) +{ + png_debug(1, "in png_do_shift"); + + if (row_info->color_type != PNG_COLOR_TYPE_PALETTE) + { + int shift_start[4], shift_dec[4]; + int channels = 0; + + if (row_info->color_type & PNG_COLOR_MASK_COLOR) + { + shift_start[channels] = row_info->bit_depth - bit_depth->red; + shift_dec[channels] = bit_depth->red; + channels++; + + shift_start[channels] = row_info->bit_depth - bit_depth->green; + shift_dec[channels] = bit_depth->green; + channels++; + + shift_start[channels] = row_info->bit_depth - bit_depth->blue; + shift_dec[channels] = bit_depth->blue; + channels++; + } + + else + { + shift_start[channels] = row_info->bit_depth - bit_depth->gray; + shift_dec[channels] = bit_depth->gray; + channels++; + } + + if (row_info->color_type & PNG_COLOR_MASK_ALPHA) + { + shift_start[channels] = row_info->bit_depth - bit_depth->alpha; + shift_dec[channels] = bit_depth->alpha; + channels++; + } + + /* With low row depths, could only be grayscale, so one channel */ + if (row_info->bit_depth < 8) + { + png_bytep bp = row; + png_size_t i; + png_byte mask; + png_size_t row_bytes = row_info->rowbytes; + + if (bit_depth->gray == 1 && row_info->bit_depth == 2) + mask = 0x55; + + else if (row_info->bit_depth == 4 && bit_depth->gray == 3) + mask = 0x11; + + else + mask = 0xff; + + for (i = 0; i < row_bytes; i++, bp++) + { + png_uint_16 v; + int j; + + v = *bp; + *bp = 0; + + for (j = shift_start[0]; j > -shift_dec[0]; j -= shift_dec[0]) + { + if (j > 0) + *bp |= (png_byte)((v << j) & 0xff); + + else + *bp |= (png_byte)((v >> (-j)) & mask); + } + } + } + + else if (row_info->bit_depth == 8) + { + png_bytep bp = row; + png_uint_32 i; + png_uint_32 istop = channels * row_info->width; + + for (i = 0; i < istop; i++, bp++) + { + + png_uint_16 v; + int j; + int c = (int)(i%channels); + + v = *bp; + *bp = 0; + + for (j = shift_start[c]; j > -shift_dec[c]; j -= shift_dec[c]) + { + if (j > 0) + *bp |= (png_byte)((v << j) & 0xff); + + else + *bp |= (png_byte)((v >> (-j)) & 0xff); + } + } + } + + else + { + png_bytep bp; + png_uint_32 i; + png_uint_32 istop = channels * row_info->width; + + for (bp = row, i = 0; i < istop; i++) + { + int c = (int)(i%channels); + png_uint_16 value, v; + int j; + + v = (png_uint_16)(((png_uint_16)(*bp) << 8) + *(bp + 1)); + value = 0; + + for (j = shift_start[c]; j > -shift_dec[c]; j -= shift_dec[c]) + { + if (j > 0) + value |= (png_uint_16)((v << j) & (png_uint_16)0xffff); + + else + value |= (png_uint_16)((v >> (-j)) & (png_uint_16)0xffff); + } + *bp++ = (png_byte)(value >> 8); + *bp++ = (png_byte)(value & 0xff); + } + } + } +} +#endif + +#ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED +void /* PRIVATE */ +png_do_write_swap_alpha(png_row_infop row_info, png_bytep row) +{ + png_debug(1, "in png_do_write_swap_alpha"); + + { + if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) + { + if (row_info->bit_depth == 8) + { + /* This converts from ARGB to RGBA */ + png_bytep sp, dp; + png_uint_32 i; + png_uint_32 row_width = row_info->width; + + for (i = 0, sp = dp = row; i < row_width; i++) + { + png_byte save = *(sp++); + *(dp++) = *(sp++); + *(dp++) = *(sp++); + *(dp++) = *(sp++); + *(dp++) = save; + } + } + +#ifdef PNG_WRITE_16BIT_SUPPORTED + else + { + /* This converts from AARRGGBB to RRGGBBAA */ + png_bytep sp, dp; + png_uint_32 i; + png_uint_32 row_width = row_info->width; + + for (i = 0, sp = dp = row; i < row_width; i++) + { + png_byte save[2]; + save[0] = *(sp++); + save[1] = *(sp++); + *(dp++) = *(sp++); + *(dp++) = *(sp++); + *(dp++) = *(sp++); + *(dp++) = *(sp++); + *(dp++) = *(sp++); + *(dp++) = *(sp++); + *(dp++) = save[0]; + *(dp++) = save[1]; + } + } +#endif /* PNG_WRITE_16BIT_SUPPORTED */ + } + + else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) + { + if (row_info->bit_depth == 8) + { + /* This converts from AG to GA */ + png_bytep sp, dp; + png_uint_32 i; + png_uint_32 row_width = row_info->width; + + for (i = 0, sp = dp = row; i < row_width; i++) + { + png_byte save = *(sp++); + *(dp++) = *(sp++); + *(dp++) = save; + } + } + +#ifdef PNG_WRITE_16BIT_SUPPORTED + else + { + /* This converts from AAGG to GGAA */ + png_bytep sp, dp; + png_uint_32 i; + png_uint_32 row_width = row_info->width; + + for (i = 0, sp = dp = row; i < row_width; i++) + { + png_byte save[2]; + save[0] = *(sp++); + save[1] = *(sp++); + *(dp++) = *(sp++); + *(dp++) = *(sp++); + *(dp++) = save[0]; + *(dp++) = save[1]; + } + } +#endif /* PNG_WRITE_16BIT_SUPPORTED */ + } + } +} +#endif + +#ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED +void /* PRIVATE */ +png_do_write_invert_alpha(png_row_infop row_info, png_bytep row) +{ + png_debug(1, "in png_do_write_invert_alpha"); + + { + if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) + { + if (row_info->bit_depth == 8) + { + /* This inverts the alpha channel in RGBA */ + png_bytep sp, dp; + png_uint_32 i; + png_uint_32 row_width = row_info->width; + + for (i = 0, sp = dp = row; i < row_width; i++) + { + /* Does nothing + *(dp++) = *(sp++); + *(dp++) = *(sp++); + *(dp++) = *(sp++); + */ + sp+=3; dp = sp; + *(dp++) = (png_byte)(255 - *(sp++)); + } + } + +#ifdef PNG_WRITE_16BIT_SUPPORTED + else + { + /* This inverts the alpha channel in RRGGBBAA */ + png_bytep sp, dp; + png_uint_32 i; + png_uint_32 row_width = row_info->width; + + for (i = 0, sp = dp = row; i < row_width; i++) + { + /* Does nothing + *(dp++) = *(sp++); + *(dp++) = *(sp++); + *(dp++) = *(sp++); + *(dp++) = *(sp++); + *(dp++) = *(sp++); + *(dp++) = *(sp++); + */ + sp+=6; dp = sp; + *(dp++) = (png_byte)(255 - *(sp++)); + *(dp++) = (png_byte)(255 - *(sp++)); + } + } +#endif /* PNG_WRITE_16BIT_SUPPORTED */ + } + + else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) + { + if (row_info->bit_depth == 8) + { + /* This inverts the alpha channel in GA */ + png_bytep sp, dp; + png_uint_32 i; + png_uint_32 row_width = row_info->width; + + for (i = 0, sp = dp = row; i < row_width; i++) + { + *(dp++) = *(sp++); + *(dp++) = (png_byte)(255 - *(sp++)); + } + } + +#ifdef PNG_WRITE_16BIT_SUPPORTED + else + { + /* This inverts the alpha channel in GGAA */ + png_bytep sp, dp; + png_uint_32 i; + png_uint_32 row_width = row_info->width; + + for (i = 0, sp = dp = row; i < row_width; i++) + { + /* Does nothing + *(dp++) = *(sp++); + *(dp++) = *(sp++); + */ + sp+=2; dp = sp; + *(dp++) = (png_byte)(255 - *(sp++)); + *(dp++) = (png_byte)(255 - *(sp++)); + } + } +#endif /* PNG_WRITE_16BIT_SUPPORTED */ + } + } +} +#endif + +#ifdef PNG_MNG_FEATURES_SUPPORTED +/* Undoes intrapixel differencing */ +void /* PRIVATE */ +png_do_write_intrapixel(png_row_infop row_info, png_bytep row) +{ + png_debug(1, "in png_do_write_intrapixel"); + + if ((row_info->color_type & PNG_COLOR_MASK_COLOR)) + { + int bytes_per_pixel; + png_uint_32 row_width = row_info->width; + if (row_info->bit_depth == 8) + { + png_bytep rp; + png_uint_32 i; + + if (row_info->color_type == PNG_COLOR_TYPE_RGB) + bytes_per_pixel = 3; + + else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) + bytes_per_pixel = 4; + + else + return; + + for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel) + { + *(rp) = (png_byte)((*rp - *(rp + 1)) & 0xff); + *(rp + 2) = (png_byte)((*(rp + 2) - *(rp + 1)) & 0xff); + } + } + +#ifdef PNG_WRITE_16BIT_SUPPORTED + else if (row_info->bit_depth == 16) + { + png_bytep rp; + png_uint_32 i; + + if (row_info->color_type == PNG_COLOR_TYPE_RGB) + bytes_per_pixel = 6; + + else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) + bytes_per_pixel = 8; + + else + return; + + for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel) + { + png_uint_32 s0 = (*(rp ) << 8) | *(rp + 1); + png_uint_32 s1 = (*(rp + 2) << 8) | *(rp + 3); + png_uint_32 s2 = (*(rp + 4) << 8) | *(rp + 5); + png_uint_32 red = (png_uint_32)((s0 - s1) & 0xffffL); + png_uint_32 blue = (png_uint_32)((s2 - s1) & 0xffffL); + *(rp ) = (png_byte)((red >> 8) & 0xff); + *(rp + 1) = (png_byte)(red & 0xff); + *(rp + 4) = (png_byte)((blue >> 8) & 0xff); + *(rp + 5) = (png_byte)(blue & 0xff); + } + } +#endif /* PNG_WRITE_16BIT_SUPPORTED */ + } +} +#endif /* PNG_MNG_FEATURES_SUPPORTED */ +#endif /* PNG_WRITE_SUPPORTED */ diff --git a/programs/develop/libraries/libpng/pngwutil.c b/programs/develop/libraries/libpng/pngwutil.c new file mode 100644 index 0000000000..2c35785aa1 --- /dev/null +++ b/programs/develop/libraries/libpng/pngwutil.c @@ -0,0 +1,2948 @@ + +/* pngwutil.c - utilities to write a PNG file + * + * Last changed in libpng 1.5.0 [January 6, 2011] + * Copyright (c) 1998-2011 Glenn Randers-Pehrson + * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) + * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) + * + * This code is released under the libpng license. + * For conditions of distribution and use, see the disclaimer + * and license in png.h + */ + +#include "pngpriv.h" + +#ifdef PNG_WRITE_SUPPORTED + +#ifdef PNG_WRITE_INT_FUNCTIONS_SUPPORTED +/* Place a 32-bit number into a buffer in PNG byte order. We work + * with unsigned numbers for convenience, although one supported + * ancillary chunk uses signed (two's complement) numbers. + */ +void PNGAPI +png_save_uint_32(png_bytep buf, png_uint_32 i) +{ + buf[0] = (png_byte)((i >> 24) & 0xff); + buf[1] = (png_byte)((i >> 16) & 0xff); + buf[2] = (png_byte)((i >> 8) & 0xff); + buf[3] = (png_byte)(i & 0xff); +} + +#ifdef PNG_SAVE_INT_32_SUPPORTED +/* The png_save_int_32 function assumes integers are stored in two's + * complement format. If this isn't the case, then this routine needs to + * be modified to write data in two's complement format. Note that, + * the following works correctly even if png_int_32 has more than 32 bits + * (compare the more complex code required on read for sign extention.) + */ +void PNGAPI +png_save_int_32(png_bytep buf, png_int_32 i) +{ + buf[0] = (png_byte)((i >> 24) & 0xff); + buf[1] = (png_byte)((i >> 16) & 0xff); + buf[2] = (png_byte)((i >> 8) & 0xff); + buf[3] = (png_byte)(i & 0xff); +} +#endif + +/* Place a 16-bit number into a buffer in PNG byte order. + * The parameter is declared unsigned int, not png_uint_16, + * just to avoid potential problems on pre-ANSI C compilers. + */ +void PNGAPI +png_save_uint_16(png_bytep buf, unsigned int i) +{ + buf[0] = (png_byte)((i >> 8) & 0xff); + buf[1] = (png_byte)(i & 0xff); +} +#endif + +/* Simple function to write the signature. If we have already written + * the magic bytes of the signature, or more likely, the PNG stream is + * being embedded into another stream and doesn't need its own signature, + * we should call png_set_sig_bytes() to tell libpng how many of the + * bytes have already been written. + */ +void PNGAPI +png_write_sig(png_structp png_ptr) +{ + png_byte png_signature[8] = {137, 80, 78, 71, 13, 10, 26, 10}; + +#ifdef PNG_IO_STATE_SUPPORTED + /* Inform the I/O callback that the signature is being written */ + png_ptr->io_state = PNG_IO_WRITING | PNG_IO_SIGNATURE; +#endif + + /* Write the rest of the 8 byte signature */ + png_write_data(png_ptr, &png_signature[png_ptr->sig_bytes], + (png_size_t)(8 - png_ptr->sig_bytes)); + + if (png_ptr->sig_bytes < 3) + png_ptr->mode |= PNG_HAVE_PNG_SIGNATURE; +} + +/* Write a PNG chunk all at once. The type is an array of ASCII characters + * representing the chunk name. The array must be at least 4 bytes in + * length, and does not need to be null terminated. To be safe, pass the + * pre-defined chunk names here, and if you need a new one, define it + * where the others are defined. The length is the length of the data. + * All the data must be present. If that is not possible, use the + * png_write_chunk_start(), png_write_chunk_data(), and png_write_chunk_end() + * functions instead. + */ +void PNGAPI +png_write_chunk(png_structp png_ptr, png_const_bytep chunk_name, + png_const_bytep data, png_size_t length) +{ + if (png_ptr == NULL) + return; + + png_write_chunk_start(png_ptr, chunk_name, (png_uint_32)length); + png_write_chunk_data(png_ptr, data, (png_size_t)length); + png_write_chunk_end(png_ptr); +} + +/* Write the start of a PNG chunk. The type is the chunk type. + * The total_length is the sum of the lengths of all the data you will be + * passing in png_write_chunk_data(). + */ +void PNGAPI +png_write_chunk_start(png_structp png_ptr, png_const_bytep chunk_name, + png_uint_32 length) +{ + png_byte buf[8]; + + png_debug2(0, "Writing %s chunk, length = %lu", chunk_name, + (unsigned long)length); + + if (png_ptr == NULL) + return; + +#ifdef PNG_IO_STATE_SUPPORTED + /* Inform the I/O callback that the chunk header is being written. + * PNG_IO_CHUNK_HDR requires a single I/O call. + */ + png_ptr->io_state = PNG_IO_WRITING | PNG_IO_CHUNK_HDR; +#endif + + /* Write the length and the chunk name */ + png_save_uint_32(buf, length); + png_memcpy(buf + 4, chunk_name, 4); + png_write_data(png_ptr, buf, (png_size_t)8); + + /* Put the chunk name into png_ptr->chunk_name */ + png_memcpy(png_ptr->chunk_name, chunk_name, 4); + + /* Reset the crc and run it over the chunk name */ + png_reset_crc(png_ptr); + + png_calculate_crc(png_ptr, chunk_name, 4); + +#ifdef PNG_IO_STATE_SUPPORTED + /* Inform the I/O callback that chunk data will (possibly) be written. + * PNG_IO_CHUNK_DATA does NOT require a specific number of I/O calls. + */ + png_ptr->io_state = PNG_IO_WRITING | PNG_IO_CHUNK_DATA; +#endif +} + +/* Write the data of a PNG chunk started with png_write_chunk_start(). + * Note that multiple calls to this function are allowed, and that the + * sum of the lengths from these calls *must* add up to the total_length + * given to png_write_chunk_start(). + */ +void PNGAPI +png_write_chunk_data(png_structp png_ptr, png_const_bytep data, + png_size_t length) +{ + /* Write the data, and run the CRC over it */ + if (png_ptr == NULL) + return; + + if (data != NULL && length > 0) + { + png_write_data(png_ptr, data, length); + + /* Update the CRC after writing the data, + * in case that the user I/O routine alters it. + */ + png_calculate_crc(png_ptr, data, length); + } +} + +/* Finish a chunk started with png_write_chunk_start(). */ +void PNGAPI +png_write_chunk_end(png_structp png_ptr) +{ + png_byte buf[4]; + + if (png_ptr == NULL) return; + +#ifdef PNG_IO_STATE_SUPPORTED + /* Inform the I/O callback that the chunk CRC is being written. + * PNG_IO_CHUNK_CRC requires a single I/O function call. + */ + png_ptr->io_state = PNG_IO_WRITING | PNG_IO_CHUNK_CRC; +#endif + + /* Write the crc in a single operation */ + png_save_uint_32(buf, png_ptr->crc); + + png_write_data(png_ptr, buf, (png_size_t)4); +} + +#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_iCCP_SUPPORTED) +/* This pair of functions encapsulates the operation of (a) compressing a + * text string, and (b) issuing it later as a series of chunk data writes. + * The compression_state structure is shared context for these functions + * set up by the caller in order to make the whole mess thread-safe. + */ + +typedef struct +{ + png_const_bytep input; /* The uncompressed input data */ + png_size_t input_len; /* Its length */ + int num_output_ptr; /* Number of output pointers used */ + int max_output_ptr; /* Size of output_ptr */ + png_bytep *output_ptr; /* Array of pointers to output */ +} compression_state; + +/* Compress given text into storage in the png_ptr structure */ +static int /* PRIVATE */ +png_text_compress(png_structp png_ptr, + png_const_charp text, png_size_t text_len, int compression, + compression_state *comp) +{ + int ret; + + comp->num_output_ptr = 0; + comp->max_output_ptr = 0; + comp->output_ptr = NULL; + comp->input = NULL; + comp->input_len = 0; + + /* We may just want to pass the text right through */ + if (compression == PNG_TEXT_COMPRESSION_NONE) + { + comp->input = (png_const_bytep)text; + comp->input_len = text_len; + return((int)text_len); + } + + if (compression >= PNG_TEXT_COMPRESSION_LAST) + { +#ifdef PNG_CONSOLE_IO_SUPPORTED + char msg[50]; + png_snprintf(msg, 50, "Unknown compression type %d", compression); + png_warning(png_ptr, msg); +#else + png_warning(png_ptr, "Unknown compression type"); +#endif + } + + /* We can't write the chunk until we find out how much data we have, + * which means we need to run the compressor first and save the + * output. This shouldn't be a problem, as the vast majority of + * comments should be reasonable, but we will set up an array of + * malloc'd pointers to be sure. + * + * If we knew the application was well behaved, we could simplify this + * greatly by assuming we can always malloc an output buffer large + * enough to hold the compressed text ((1001 * text_len / 1000) + 12) + * and malloc this directly. The only time this would be a bad idea is + * if we can't malloc more than 64K and we have 64K of random input + * data, or if the input string is incredibly large (although this + * wouldn't cause a failure, just a slowdown due to swapping). + */ + + /* Set up the compression buffers */ + /* TODO: the following cast hides a potential overflow problem. */ + png_ptr->zstream.avail_in = (uInt)text_len; + /* NOTE: assume zlib doesn't overwrite the input */ + png_ptr->zstream.next_in = (Bytef *)text; + png_ptr->zstream.avail_out = png_ptr->zbuf_size; + png_ptr->zstream.next_out = png_ptr->zbuf; + + /* This is the same compression loop as in png_write_row() */ + do + { + /* Compress the data */ + ret = deflate(&png_ptr->zstream, Z_NO_FLUSH); + + if (ret != Z_OK) + { + /* Error */ + if (png_ptr->zstream.msg != NULL) + png_error(png_ptr, png_ptr->zstream.msg); + + else + png_error(png_ptr, "zlib error"); + } + + /* Check to see if we need more room */ + if (!(png_ptr->zstream.avail_out)) + { + /* Make sure the output array has room */ + if (comp->num_output_ptr >= comp->max_output_ptr) + { + int old_max; + + old_max = comp->max_output_ptr; + comp->max_output_ptr = comp->num_output_ptr + 4; + if (comp->output_ptr != NULL) + { + png_bytepp old_ptr; + + old_ptr = comp->output_ptr; + + comp->output_ptr = (png_bytepp)png_malloc(png_ptr, + (png_alloc_size_t) + (comp->max_output_ptr * png_sizeof(png_charpp))); + + png_memcpy(comp->output_ptr, old_ptr, old_max + * png_sizeof(png_charp)); + + png_free(png_ptr, old_ptr); + } + else + comp->output_ptr = (png_bytepp)png_malloc(png_ptr, + (png_alloc_size_t) + (comp->max_output_ptr * png_sizeof(png_charp))); + } + + /* Save the data */ + comp->output_ptr[comp->num_output_ptr] = + (png_bytep)png_malloc(png_ptr, + (png_alloc_size_t)png_ptr->zbuf_size); + + png_memcpy(comp->output_ptr[comp->num_output_ptr], png_ptr->zbuf, + png_ptr->zbuf_size); + + comp->num_output_ptr++; + + /* and reset the buffer */ + png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; + png_ptr->zstream.next_out = png_ptr->zbuf; + } + /* Continue until we don't have any more to compress */ + } while (png_ptr->zstream.avail_in); + + /* Finish the compression */ + do + { + /* Tell zlib we are finished */ + ret = deflate(&png_ptr->zstream, Z_FINISH); + + if (ret == Z_OK) + { + /* Check to see if we need more room */ + if (!(png_ptr->zstream.avail_out)) + { + /* Check to make sure our output array has room */ + if (comp->num_output_ptr >= comp->max_output_ptr) + { + int old_max; + + old_max = comp->max_output_ptr; + comp->max_output_ptr = comp->num_output_ptr + 4; + if (comp->output_ptr != NULL) + { + png_bytepp old_ptr; + + old_ptr = comp->output_ptr; + + /* This could be optimized to realloc() */ + comp->output_ptr = (png_bytepp)png_malloc(png_ptr, + (png_alloc_size_t)(comp->max_output_ptr * + png_sizeof(png_charp))); + + png_memcpy(comp->output_ptr, old_ptr, + old_max * png_sizeof(png_charp)); + + png_free(png_ptr, old_ptr); + } + + else + comp->output_ptr = (png_bytepp)png_malloc(png_ptr, + (png_alloc_size_t)(comp->max_output_ptr * + png_sizeof(png_charp))); + } + + /* Save the data */ + comp->output_ptr[comp->num_output_ptr] = + (png_bytep)png_malloc(png_ptr, + (png_alloc_size_t)png_ptr->zbuf_size); + + png_memcpy(comp->output_ptr[comp->num_output_ptr], png_ptr->zbuf, + png_ptr->zbuf_size); + + comp->num_output_ptr++; + + /* and reset the buffer pointers */ + png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; + png_ptr->zstream.next_out = png_ptr->zbuf; + } + } + else if (ret != Z_STREAM_END) + { + /* We got an error */ + if (png_ptr->zstream.msg != NULL) + png_error(png_ptr, png_ptr->zstream.msg); + + else + png_error(png_ptr, "zlib error"); + } + } while (ret != Z_STREAM_END); + + /* Text length is number of buffers plus last buffer */ + text_len = png_ptr->zbuf_size * comp->num_output_ptr; + + if (png_ptr->zstream.avail_out < png_ptr->zbuf_size) + text_len += png_ptr->zbuf_size - (png_size_t)png_ptr->zstream.avail_out; + + return((int)text_len); +} + +/* Ship the compressed text out via chunk writes */ +static void /* PRIVATE */ +png_write_compressed_data_out(png_structp png_ptr, compression_state *comp) +{ + int i; + + /* Handle the no-compression case */ + if (comp->input) + { + png_write_chunk_data(png_ptr, comp->input, comp->input_len); + + return; + } + + /* Write saved output buffers, if any */ + for (i = 0; i < comp->num_output_ptr; i++) + { + png_write_chunk_data(png_ptr, comp->output_ptr[i], + (png_size_t)png_ptr->zbuf_size); + + png_free(png_ptr, comp->output_ptr[i]); + } + + if (comp->max_output_ptr != 0) + png_free(png_ptr, comp->output_ptr); + + /* Write anything left in zbuf */ + if (png_ptr->zstream.avail_out < (png_uint_32)png_ptr->zbuf_size) + png_write_chunk_data(png_ptr, png_ptr->zbuf, + (png_size_t)(png_ptr->zbuf_size - png_ptr->zstream.avail_out)); + + /* Reset zlib for another zTXt/iTXt or image data */ + deflateReset(&png_ptr->zstream); + png_ptr->zstream.data_type = Z_BINARY; +} +#endif + +/* Write the IHDR chunk, and update the png_struct with the necessary + * information. Note that the rest of this code depends upon this + * information being correct. + */ +void /* PRIVATE */ +png_write_IHDR(png_structp png_ptr, png_uint_32 width, png_uint_32 height, + int bit_depth, int color_type, int compression_type, int filter_type, + int interlace_type) +{ + PNG_IHDR; + int ret; + + png_byte buf[13]; /* Buffer to store the IHDR info */ + + png_debug(1, "in png_write_IHDR"); + + /* Check that we have valid input data from the application info */ + switch (color_type) + { + case PNG_COLOR_TYPE_GRAY: + switch (bit_depth) + { + case 1: + case 2: + case 4: + case 8: +#ifdef PNG_WRITE_16BIT_SUPPORTED + case 16: +#endif + png_ptr->channels = 1; break; + + default: + png_error(png_ptr, + "Invalid bit depth for grayscale image"); + } + break; + + case PNG_COLOR_TYPE_RGB: +#ifdef PNG_WRITE_16BIT_SUPPORTED + if (bit_depth != 8 && bit_depth != 16) +#else + if (bit_depth != 8) +#endif + png_error(png_ptr, "Invalid bit depth for RGB image"); + + png_ptr->channels = 3; + break; + + case PNG_COLOR_TYPE_PALETTE: + switch (bit_depth) + { + case 1: + case 2: + case 4: + case 8: + png_ptr->channels = 1; + break; + + default: + png_error(png_ptr, "Invalid bit depth for paletted image"); + } + break; + + case PNG_COLOR_TYPE_GRAY_ALPHA: + if (bit_depth != 8 && bit_depth != 16) + png_error(png_ptr, "Invalid bit depth for grayscale+alpha image"); + + png_ptr->channels = 2; + break; + + case PNG_COLOR_TYPE_RGB_ALPHA: +#ifdef PNG_WRITE_16BIT_SUPPORTED + if (bit_depth != 8 && bit_depth != 16) +#else + if (bit_depth != 8) +#endif + png_error(png_ptr, "Invalid bit depth for RGBA image"); + + png_ptr->channels = 4; + break; + + default: + png_error(png_ptr, "Invalid image color type specified"); + } + + if (compression_type != PNG_COMPRESSION_TYPE_BASE) + { + png_warning(png_ptr, "Invalid compression type specified"); + compression_type = PNG_COMPRESSION_TYPE_BASE; + } + + /* Write filter_method 64 (intrapixel differencing) only if + * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and + * 2. Libpng did not write a PNG signature (this filter_method is only + * used in PNG datastreams that are embedded in MNG datastreams) and + * 3. The application called png_permit_mng_features with a mask that + * included PNG_FLAG_MNG_FILTER_64 and + * 4. The filter_method is 64 and + * 5. The color_type is RGB or RGBA + */ + if ( +#ifdef PNG_MNG_FEATURES_SUPPORTED + !((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) && + ((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE) == 0) && + (color_type == PNG_COLOR_TYPE_RGB || + color_type == PNG_COLOR_TYPE_RGB_ALPHA) && + (filter_type == PNG_INTRAPIXEL_DIFFERENCING)) && +#endif + filter_type != PNG_FILTER_TYPE_BASE) + { + png_warning(png_ptr, "Invalid filter type specified"); + filter_type = PNG_FILTER_TYPE_BASE; + } + +#ifdef PNG_WRITE_INTERLACING_SUPPORTED + if (interlace_type != PNG_INTERLACE_NONE && + interlace_type != PNG_INTERLACE_ADAM7) + { + png_warning(png_ptr, "Invalid interlace type specified"); + interlace_type = PNG_INTERLACE_ADAM7; + } +#else + interlace_type=PNG_INTERLACE_NONE; +#endif + + /* Save the relevent information */ + png_ptr->bit_depth = (png_byte)bit_depth; + png_ptr->color_type = (png_byte)color_type; + png_ptr->interlaced = (png_byte)interlace_type; +#ifdef PNG_MNG_FEATURES_SUPPORTED + png_ptr->filter_type = (png_byte)filter_type; +#endif + png_ptr->compression_type = (png_byte)compression_type; + png_ptr->width = width; + png_ptr->height = height; + + png_ptr->pixel_depth = (png_byte)(bit_depth * png_ptr->channels); + png_ptr->rowbytes = PNG_ROWBYTES(png_ptr->pixel_depth, width); + /* Set the usr info, so any transformations can modify it */ + png_ptr->usr_width = png_ptr->width; + png_ptr->usr_bit_depth = png_ptr->bit_depth; + png_ptr->usr_channels = png_ptr->channels; + + /* Pack the header information into the buffer */ + png_save_uint_32(buf, width); + png_save_uint_32(buf + 4, height); + buf[8] = (png_byte)bit_depth; + buf[9] = (png_byte)color_type; + buf[10] = (png_byte)compression_type; + buf[11] = (png_byte)filter_type; + buf[12] = (png_byte)interlace_type; + + /* Write the chunk */ + png_write_chunk(png_ptr, png_IHDR, buf, (png_size_t)13); + + /* Initialize zlib with PNG info */ + png_ptr->zstream.zalloc = png_zalloc; + png_ptr->zstream.zfree = png_zfree; + png_ptr->zstream.opaque = (voidpf)png_ptr; + + if (!(png_ptr->do_filter)) + { + if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE || + png_ptr->bit_depth < 8) + png_ptr->do_filter = PNG_FILTER_NONE; + + else + png_ptr->do_filter = PNG_ALL_FILTERS; + } + + if (!(png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_STRATEGY)) + { + if (png_ptr->do_filter != PNG_FILTER_NONE) + png_ptr->zlib_strategy = Z_FILTERED; + + else + png_ptr->zlib_strategy = Z_DEFAULT_STRATEGY; + } + + if (!(png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_LEVEL)) + png_ptr->zlib_level = Z_DEFAULT_COMPRESSION; + + if (!(png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL)) + png_ptr->zlib_mem_level = 8; + + if (!(png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS)) + png_ptr->zlib_window_bits = 15; + + if (!(png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_METHOD)) + png_ptr->zlib_method = 8; + + ret = deflateInit2(&png_ptr->zstream, png_ptr->zlib_level, + png_ptr->zlib_method, png_ptr->zlib_window_bits, + png_ptr->zlib_mem_level, png_ptr->zlib_strategy); + + if (ret != Z_OK) + { + if (ret == Z_VERSION_ERROR) + png_error(png_ptr, + "zlib failed to initialize compressor -- version error"); + + if (ret == Z_STREAM_ERROR) + png_error(png_ptr, + "zlib failed to initialize compressor -- stream error"); + + if (ret == Z_MEM_ERROR) + png_error(png_ptr, + "zlib failed to initialize compressor -- mem error"); + + png_error(png_ptr, "zlib failed to initialize compressor"); + } + + png_ptr->zstream.next_out = png_ptr->zbuf; + png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; + /* libpng is not interested in zstream.data_type, so set it + * to a predefined value, to avoid its evaluation inside zlib + */ + png_ptr->zstream.data_type = Z_BINARY; + + png_ptr->mode = PNG_HAVE_IHDR; +} + +/* Write the palette. We are careful not to trust png_color to be in the + * correct order for PNG, so people can redefine it to any convenient + * structure. + */ +void /* PRIVATE */ +png_write_PLTE(png_structp png_ptr, png_const_colorp palette, + png_uint_32 num_pal) +{ + PNG_PLTE; + png_uint_32 i; + png_const_colorp pal_ptr; + png_byte buf[3]; + + png_debug(1, "in png_write_PLTE"); + + if (( +#ifdef PNG_MNG_FEATURES_SUPPORTED + !(png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE) && +#endif + num_pal == 0) || num_pal > 256) + { + if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) + { + png_error(png_ptr, "Invalid number of colors in palette"); + } + + else + { + png_warning(png_ptr, "Invalid number of colors in palette"); + return; + } + } + + if (!(png_ptr->color_type&PNG_COLOR_MASK_COLOR)) + { + png_warning(png_ptr, + "Ignoring request to write a PLTE chunk in grayscale PNG"); + + return; + } + + png_ptr->num_palette = (png_uint_16)num_pal; + png_debug1(3, "num_palette = %d", png_ptr->num_palette); + + png_write_chunk_start(png_ptr, png_PLTE, (png_uint_32)(num_pal * 3)); +#ifdef PNG_POINTER_INDEXING_SUPPORTED + + for (i = 0, pal_ptr = palette; i < num_pal; i++, pal_ptr++) + { + buf[0] = pal_ptr->red; + buf[1] = pal_ptr->green; + buf[2] = pal_ptr->blue; + png_write_chunk_data(png_ptr, buf, (png_size_t)3); + } + +#else + /* This is a little slower but some buggy compilers need to do this + * instead + */ + pal_ptr=palette; + + for (i = 0; i < num_pal; i++) + { + buf[0] = pal_ptr[i].red; + buf[1] = pal_ptr[i].green; + buf[2] = pal_ptr[i].blue; + png_write_chunk_data(png_ptr, buf, (png_size_t)3); + } + +#endif + png_write_chunk_end(png_ptr); + png_ptr->mode |= PNG_HAVE_PLTE; +} + +/* Write an IDAT chunk */ +void /* PRIVATE */ +png_write_IDAT(png_structp png_ptr, png_bytep data, png_size_t length) +{ + PNG_IDAT; + + png_debug(1, "in png_write_IDAT"); + + /* Optimize the CMF field in the zlib stream. */ + /* This hack of the zlib stream is compliant to the stream specification. */ + if (!(png_ptr->mode & PNG_HAVE_IDAT) && + png_ptr->compression_type == PNG_COMPRESSION_TYPE_BASE) + { + unsigned int z_cmf = data[0]; /* zlib compression method and flags */ + if ((z_cmf & 0x0f) == 8 && (z_cmf & 0xf0) <= 0x70) + { + /* Avoid memory underflows and multiplication overflows. + * + * The conditions below are practically always satisfied; + * however, they still must be checked. + */ + if (length >= 2 && + png_ptr->height < 16384 && png_ptr->width < 16384) + { + png_uint_32 uncompressed_idat_size = png_ptr->height * + ((png_ptr->width * + png_ptr->channels * png_ptr->bit_depth + 15) >> 3); + unsigned int z_cinfo = z_cmf >> 4; + unsigned int half_z_window_size = 1 << (z_cinfo + 7); + while (uncompressed_idat_size <= half_z_window_size && + half_z_window_size >= 256) + { + z_cinfo--; + half_z_window_size >>= 1; + } + + z_cmf = (z_cmf & 0x0f) | (z_cinfo << 4); + + if (data[0] != z_cmf) + { + int tmp; + data[0] = (png_byte)z_cmf; + tmp = data[1] & 0xe0; + tmp += 0x1f - ((z_cmf << 8) + tmp) % 0x1f; + data[1] = (png_byte)tmp; + } + } + } + + else + png_error(png_ptr, + "Invalid zlib compression method or flags in IDAT"); + } + + png_write_chunk(png_ptr, png_IDAT, data, length); + png_ptr->mode |= PNG_HAVE_IDAT; +} + +/* Write an IEND chunk */ +void /* PRIVATE */ +png_write_IEND(png_structp png_ptr) +{ + PNG_IEND; + + png_debug(1, "in png_write_IEND"); + + png_write_chunk(png_ptr, png_IEND, NULL, (png_size_t)0); + png_ptr->mode |= PNG_HAVE_IEND; +} + +#ifdef PNG_WRITE_gAMA_SUPPORTED +/* Write a gAMA chunk */ +void /* PRIVATE */ +png_write_gAMA_fixed(png_structp png_ptr, png_fixed_point file_gamma) +{ + PNG_gAMA; + png_byte buf[4]; + + png_debug(1, "in png_write_gAMA"); + + /* file_gamma is saved in 1/100,000ths */ + png_save_uint_32(buf, (png_uint_32)file_gamma); + png_write_chunk(png_ptr, png_gAMA, buf, (png_size_t)4); +} +#endif + +#ifdef PNG_WRITE_sRGB_SUPPORTED +/* Write a sRGB chunk */ +void /* PRIVATE */ +png_write_sRGB(png_structp png_ptr, int srgb_intent) +{ + PNG_sRGB; + png_byte buf[1]; + + png_debug(1, "in png_write_sRGB"); + + if (srgb_intent >= PNG_sRGB_INTENT_LAST) + png_warning(png_ptr, + "Invalid sRGB rendering intent specified"); + + buf[0]=(png_byte)srgb_intent; + png_write_chunk(png_ptr, png_sRGB, buf, (png_size_t)1); +} +#endif + +#ifdef PNG_WRITE_iCCP_SUPPORTED +/* Write an iCCP chunk */ +void /* PRIVATE */ +png_write_iCCP(png_structp png_ptr, png_const_charp name, int compression_type, + png_const_charp profile, int profile_len) +{ + PNG_iCCP; + png_size_t name_len; + png_charp new_name; + compression_state comp; + int embedded_profile_len = 0; + + png_debug(1, "in png_write_iCCP"); + + comp.num_output_ptr = 0; + comp.max_output_ptr = 0; + comp.output_ptr = NULL; + comp.input = NULL; + comp.input_len = 0; + + if ((name_len = png_check_keyword(png_ptr, name, &new_name)) == 0) + return; + + if (compression_type != PNG_COMPRESSION_TYPE_BASE) + png_warning(png_ptr, "Unknown compression type in iCCP chunk"); + + if (profile == NULL) + profile_len = 0; + + if (profile_len > 3) + embedded_profile_len = + ((*( (png_const_bytep)profile ))<<24) | + ((*( (png_const_bytep)profile + 1))<<16) | + ((*( (png_const_bytep)profile + 2))<< 8) | + ((*( (png_const_bytep)profile + 3)) ); + + if (embedded_profile_len < 0) + { + png_warning(png_ptr, + "Embedded profile length in iCCP chunk is negative"); + + png_free(png_ptr, new_name); + return; + } + + if (profile_len < embedded_profile_len) + { + png_warning(png_ptr, + "Embedded profile length too large in iCCP chunk"); + + png_free(png_ptr, new_name); + return; + } + + if (profile_len > embedded_profile_len) + { + png_warning(png_ptr, + "Truncating profile to actual length in iCCP chunk"); + + profile_len = embedded_profile_len; + } + + if (profile_len) + profile_len = png_text_compress(png_ptr, profile, + (png_size_t)profile_len, PNG_COMPRESSION_TYPE_BASE, &comp); + + /* Make sure we include the NULL after the name and the compression type */ + png_write_chunk_start(png_ptr, png_iCCP, + (png_uint_32)(name_len + profile_len + 2)); + + new_name[name_len + 1] = 0x00; + + png_write_chunk_data(png_ptr, (png_bytep)new_name, + (png_size_t)(name_len + 2)); + + if (profile_len) + png_write_compressed_data_out(png_ptr, &comp); + + png_write_chunk_end(png_ptr); + png_free(png_ptr, new_name); +} +#endif + +#ifdef PNG_WRITE_sPLT_SUPPORTED +/* Write a sPLT chunk */ +void /* PRIVATE */ +png_write_sPLT(png_structp png_ptr, png_const_sPLT_tp spalette) +{ + PNG_sPLT; + png_size_t name_len; + png_charp new_name; + png_byte entrybuf[10]; + png_size_t entry_size = (spalette->depth == 8 ? 6 : 10); + png_size_t palette_size = entry_size * spalette->nentries; + png_sPLT_entryp ep; +#ifndef PNG_POINTER_INDEXING_SUPPORTED + int i; +#endif + + png_debug(1, "in png_write_sPLT"); + + if ((name_len = png_check_keyword(png_ptr,spalette->name, &new_name))==0) + return; + + /* Make sure we include the NULL after the name */ + png_write_chunk_start(png_ptr, png_sPLT, + (png_uint_32)(name_len + 2 + palette_size)); + + png_write_chunk_data(png_ptr, (png_bytep)new_name, + (png_size_t)(name_len + 1)); + + png_write_chunk_data(png_ptr, &spalette->depth, (png_size_t)1); + + /* Loop through each palette entry, writing appropriately */ +#ifdef PNG_POINTER_INDEXING_SUPPORTED + for (ep = spalette->entries; epentries + spalette->nentries; ep++) + { + if (spalette->depth == 8) + { + entrybuf[0] = (png_byte)ep->red; + entrybuf[1] = (png_byte)ep->green; + entrybuf[2] = (png_byte)ep->blue; + entrybuf[3] = (png_byte)ep->alpha; + png_save_uint_16(entrybuf + 4, ep->frequency); + } + + else + { + png_save_uint_16(entrybuf + 0, ep->red); + png_save_uint_16(entrybuf + 2, ep->green); + png_save_uint_16(entrybuf + 4, ep->blue); + png_save_uint_16(entrybuf + 6, ep->alpha); + png_save_uint_16(entrybuf + 8, ep->frequency); + } + + png_write_chunk_data(png_ptr, entrybuf, (png_size_t)entry_size); + } +#else + ep=spalette->entries; + for (i = 0; i>spalette->nentries; i++) + { + if (spalette->depth == 8) + { + entrybuf[0] = (png_byte)ep[i].red; + entrybuf[1] = (png_byte)ep[i].green; + entrybuf[2] = (png_byte)ep[i].blue; + entrybuf[3] = (png_byte)ep[i].alpha; + png_save_uint_16(entrybuf + 4, ep[i].frequency); + } + + else + { + png_save_uint_16(entrybuf + 0, ep[i].red); + png_save_uint_16(entrybuf + 2, ep[i].green); + png_save_uint_16(entrybuf + 4, ep[i].blue); + png_save_uint_16(entrybuf + 6, ep[i].alpha); + png_save_uint_16(entrybuf + 8, ep[i].frequency); + } + + png_write_chunk_data(png_ptr, entrybuf, (png_size_t)entry_size); + } +#endif + + png_write_chunk_end(png_ptr); + png_free(png_ptr, new_name); +} +#endif + +#ifdef PNG_WRITE_sBIT_SUPPORTED +/* Write the sBIT chunk */ +void /* PRIVATE */ +png_write_sBIT(png_structp png_ptr, png_const_color_8p sbit, int color_type) +{ + PNG_sBIT; + png_byte buf[4]; + png_size_t size; + + png_debug(1, "in png_write_sBIT"); + + /* Make sure we don't depend upon the order of PNG_COLOR_8 */ + if (color_type & PNG_COLOR_MASK_COLOR) + { + png_byte maxbits; + + maxbits = (png_byte)(color_type==PNG_COLOR_TYPE_PALETTE ? 8 : + png_ptr->usr_bit_depth); + + if (sbit->red == 0 || sbit->red > maxbits || + sbit->green == 0 || sbit->green > maxbits || + sbit->blue == 0 || sbit->blue > maxbits) + { + png_warning(png_ptr, "Invalid sBIT depth specified"); + return; + } + + buf[0] = sbit->red; + buf[1] = sbit->green; + buf[2] = sbit->blue; + size = 3; + } + + else + { + if (sbit->gray == 0 || sbit->gray > png_ptr->usr_bit_depth) + { + png_warning(png_ptr, "Invalid sBIT depth specified"); + return; + } + + buf[0] = sbit->gray; + size = 1; + } + + if (color_type & PNG_COLOR_MASK_ALPHA) + { + if (sbit->alpha == 0 || sbit->alpha > png_ptr->usr_bit_depth) + { + png_warning(png_ptr, "Invalid sBIT depth specified"); + return; + } + + buf[size++] = sbit->alpha; + } + + png_write_chunk(png_ptr, png_sBIT, buf, size); +} +#endif + +#ifdef PNG_WRITE_cHRM_SUPPORTED +/* Write the cHRM chunk */ +void /* PRIVATE */ +png_write_cHRM_fixed(png_structp png_ptr, png_fixed_point white_x, + png_fixed_point white_y, png_fixed_point red_x, png_fixed_point red_y, + png_fixed_point green_x, png_fixed_point green_y, png_fixed_point blue_x, + png_fixed_point blue_y) +{ + PNG_cHRM; + png_byte buf[32]; + + png_debug(1, "in png_write_cHRM"); + + /* Each value is saved in 1/100,000ths */ +#ifdef PNG_CHECK_cHRM_SUPPORTED + if (png_check_cHRM_fixed(png_ptr, white_x, white_y, red_x, red_y, + green_x, green_y, blue_x, blue_y)) +#endif + { + png_save_uint_32(buf, (png_uint_32)white_x); + png_save_uint_32(buf + 4, (png_uint_32)white_y); + + png_save_uint_32(buf + 8, (png_uint_32)red_x); + png_save_uint_32(buf + 12, (png_uint_32)red_y); + + png_save_uint_32(buf + 16, (png_uint_32)green_x); + png_save_uint_32(buf + 20, (png_uint_32)green_y); + + png_save_uint_32(buf + 24, (png_uint_32)blue_x); + png_save_uint_32(buf + 28, (png_uint_32)blue_y); + + png_write_chunk(png_ptr, png_cHRM, buf, (png_size_t)32); + } +} +#endif + +#ifdef PNG_WRITE_tRNS_SUPPORTED +/* Write the tRNS chunk */ +void /* PRIVATE */ +png_write_tRNS(png_structp png_ptr, png_const_bytep trans_alpha, + png_const_color_16p tran, int num_trans, int color_type) +{ + PNG_tRNS; + png_byte buf[6]; + + png_debug(1, "in png_write_tRNS"); + + if (color_type == PNG_COLOR_TYPE_PALETTE) + { + if (num_trans <= 0 || num_trans > (int)png_ptr->num_palette) + { + png_warning(png_ptr, "Invalid number of transparent colors specified"); + return; + } + + /* Write the chunk out as it is */ + png_write_chunk(png_ptr, png_tRNS, trans_alpha, (png_size_t)num_trans); + } + + else if (color_type == PNG_COLOR_TYPE_GRAY) + { + /* One 16 bit value */ + if (tran->gray >= (1 << png_ptr->bit_depth)) + { + png_warning(png_ptr, + "Ignoring attempt to write tRNS chunk out-of-range for bit_depth"); + + return; + } + + png_save_uint_16(buf, tran->gray); + png_write_chunk(png_ptr, png_tRNS, buf, (png_size_t)2); + } + + else if (color_type == PNG_COLOR_TYPE_RGB) + { + /* Three 16 bit values */ + png_save_uint_16(buf, tran->red); + png_save_uint_16(buf + 2, tran->green); + png_save_uint_16(buf + 4, tran->blue); +#ifdef PNG_WRITE_16BIT_SUPPORTED + if (png_ptr->bit_depth == 8 && (buf[0] | buf[2] | buf[4])) +#else + if (buf[0] | buf[2] | buf[4]) +#endif + { + png_warning(png_ptr, + "Ignoring attempt to write 16-bit tRNS chunk when bit_depth is 8"); + return; + } + + png_write_chunk(png_ptr, png_tRNS, buf, (png_size_t)6); + } + + else + { + png_warning(png_ptr, "Can't write tRNS with an alpha channel"); + } +} +#endif + +#ifdef PNG_WRITE_bKGD_SUPPORTED +/* Write the background chunk */ +void /* PRIVATE */ +png_write_bKGD(png_structp png_ptr, png_const_color_16p back, int color_type) +{ + PNG_bKGD; + png_byte buf[6]; + + png_debug(1, "in png_write_bKGD"); + + if (color_type == PNG_COLOR_TYPE_PALETTE) + { + if ( +#ifdef PNG_MNG_FEATURES_SUPPORTED + (png_ptr->num_palette || + (!(png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE))) && +#endif + back->index >= png_ptr->num_palette) + { + png_warning(png_ptr, "Invalid background palette index"); + return; + } + + buf[0] = back->index; + png_write_chunk(png_ptr, png_bKGD, buf, (png_size_t)1); + } + + else if (color_type & PNG_COLOR_MASK_COLOR) + { + png_save_uint_16(buf, back->red); + png_save_uint_16(buf + 2, back->green); + png_save_uint_16(buf + 4, back->blue); +#ifdef PNG_WRITE_16BIT_SUPPORTED + if (png_ptr->bit_depth == 8 && (buf[0] | buf[2] | buf[4])) +#else + if (buf[0] | buf[2] | buf[4]) +#endif + { + png_warning(png_ptr, + "Ignoring attempt to write 16-bit bKGD chunk when bit_depth is 8"); + + return; + } + + png_write_chunk(png_ptr, png_bKGD, buf, (png_size_t)6); + } + + else + { + if (back->gray >= (1 << png_ptr->bit_depth)) + { + png_warning(png_ptr, + "Ignoring attempt to write bKGD chunk out-of-range for bit_depth"); + + return; + } + + png_save_uint_16(buf, back->gray); + png_write_chunk(png_ptr, png_bKGD, buf, (png_size_t)2); + } +} +#endif + +#ifdef PNG_WRITE_hIST_SUPPORTED +/* Write the histogram */ +void /* PRIVATE */ +png_write_hIST(png_structp png_ptr, png_const_uint_16p hist, int num_hist) +{ + PNG_hIST; + int i; + png_byte buf[3]; + + png_debug(1, "in png_write_hIST"); + + if (num_hist > (int)png_ptr->num_palette) + { + png_debug2(3, "num_hist = %d, num_palette = %d", num_hist, + png_ptr->num_palette); + + png_warning(png_ptr, "Invalid number of histogram entries specified"); + return; + } + + png_write_chunk_start(png_ptr, png_hIST, (png_uint_32)(num_hist * 2)); + + for (i = 0; i < num_hist; i++) + { + png_save_uint_16(buf, hist[i]); + png_write_chunk_data(png_ptr, buf, (png_size_t)2); + } + + png_write_chunk_end(png_ptr); +} +#endif + +#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \ + defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED) +/* Check that the tEXt or zTXt keyword is valid per PNG 1.0 specification, + * and if invalid, correct the keyword rather than discarding the entire + * chunk. The PNG 1.0 specification requires keywords 1-79 characters in + * length, forbids leading or trailing whitespace, multiple internal spaces, + * and the non-break space (0x80) from ISO 8859-1. Returns keyword length. + * + * The new_key is allocated to hold the corrected keyword and must be freed + * by the calling routine. This avoids problems with trying to write to + * static keywords without having to have duplicate copies of the strings. + */ +png_size_t /* PRIVATE */ +png_check_keyword(png_structp png_ptr, png_const_charp key, png_charpp new_key) +{ + png_size_t key_len; + png_const_charp ikp; + png_charp kp, dp; + int kflag; + int kwarn=0; + + png_debug(1, "in png_check_keyword"); + + *new_key = NULL; + + if (key == NULL || (key_len = png_strlen(key)) == 0) + { + png_warning(png_ptr, "zero length keyword"); + return ((png_size_t)0); + } + + png_debug1(2, "Keyword to be checked is '%s'", key); + + *new_key = (png_charp)png_malloc_warn(png_ptr, (png_uint_32)(key_len + 2)); + + if (*new_key == NULL) + { + png_warning(png_ptr, "Out of memory while procesing keyword"); + return ((png_size_t)0); + } + + /* Replace non-printing characters with a blank and print a warning */ + for (ikp = key, dp = *new_key; *ikp != '\0'; ikp++, dp++) + { + if ((png_byte)*ikp < 0x20 || + ((png_byte)*ikp > 0x7E && (png_byte)*ikp < 0xA1)) + { +#ifdef PNG_CONSOLE_IO_SUPPORTED + char msg[40]; + + png_snprintf(msg, 40, + "invalid keyword character 0x%02X", (png_byte)*ikp); + png_warning(png_ptr, msg); +#else + png_warning(png_ptr, "invalid character in keyword"); +#endif + *dp = ' '; + } + + else + { + *dp = *ikp; + } + } + *dp = '\0'; + + /* Remove any trailing white space. */ + kp = *new_key + key_len - 1; + if (*kp == ' ') + { + png_warning(png_ptr, "trailing spaces removed from keyword"); + + while (*kp == ' ') + { + *(kp--) = '\0'; + key_len--; + } + } + + /* Remove any leading white space. */ + kp = *new_key; + if (*kp == ' ') + { + png_warning(png_ptr, "leading spaces removed from keyword"); + + while (*kp == ' ') + { + kp++; + key_len--; + } + } + + png_debug1(2, "Checking for multiple internal spaces in '%s'", kp); + + /* Remove multiple internal spaces. */ + for (kflag = 0, dp = *new_key; *kp != '\0'; kp++) + { + if (*kp == ' ' && kflag == 0) + { + *(dp++) = *kp; + kflag = 1; + } + + else if (*kp == ' ') + { + key_len--; + kwarn = 1; + } + + else + { + *(dp++) = *kp; + kflag = 0; + } + } + *dp = '\0'; + if (kwarn) + png_warning(png_ptr, "extra interior spaces removed from keyword"); + + if (key_len == 0) + { + png_free(png_ptr, *new_key); + png_warning(png_ptr, "Zero length keyword"); + } + + if (key_len > 79) + { + png_warning(png_ptr, "keyword length must be 1 - 79 characters"); + (*new_key)[79] = '\0'; + key_len = 79; + } + + return (key_len); +} +#endif + +#ifdef PNG_WRITE_tEXt_SUPPORTED +/* Write a tEXt chunk */ +void /* PRIVATE */ +png_write_tEXt(png_structp png_ptr, png_const_charp key, png_const_charp text, + png_size_t text_len) +{ + PNG_tEXt; + png_size_t key_len; + png_charp new_key; + + png_debug(1, "in png_write_tEXt"); + + if ((key_len = png_check_keyword(png_ptr, key, &new_key))==0) + return; + + if (text == NULL || *text == '\0') + text_len = 0; + + else + text_len = png_strlen(text); + + /* Make sure we include the 0 after the key */ + png_write_chunk_start(png_ptr, png_tEXt, + (png_uint_32)(key_len + text_len + 1)); + /* + * We leave it to the application to meet PNG-1.0 requirements on the + * contents of the text. PNG-1.0 through PNG-1.2 discourage the use of + * any non-Latin-1 characters except for NEWLINE. ISO PNG will forbid them. + * The NUL character is forbidden by PNG-1.0 through PNG-1.2 and ISO PNG. + */ + png_write_chunk_data(png_ptr, (png_bytep)new_key, + (png_size_t)(key_len + 1)); + + if (text_len) + png_write_chunk_data(png_ptr, (png_const_bytep)text, + (png_size_t)text_len); + + png_write_chunk_end(png_ptr); + png_free(png_ptr, new_key); +} +#endif + +#ifdef PNG_WRITE_zTXt_SUPPORTED +/* Write a compressed text chunk */ +void /* PRIVATE */ +png_write_zTXt(png_structp png_ptr, png_const_charp key, png_const_charp text, + png_size_t text_len, int compression) +{ + PNG_zTXt; + png_size_t key_len; + png_byte buf; + png_charp new_key; + compression_state comp; + + png_debug(1, "in png_write_zTXt"); + + comp.num_output_ptr = 0; + comp.max_output_ptr = 0; + comp.output_ptr = NULL; + comp.input = NULL; + comp.input_len = 0; + + if ((key_len = png_check_keyword(png_ptr, key, &new_key)) == 0) + { + png_free(png_ptr, new_key); + return; + } + + if (text == NULL || *text == '\0' || compression==PNG_TEXT_COMPRESSION_NONE) + { + png_write_tEXt(png_ptr, new_key, text, (png_size_t)0); + png_free(png_ptr, new_key); + return; + } + + text_len = png_strlen(text); + + /* Compute the compressed data; do it now for the length */ + text_len = png_text_compress(png_ptr, text, text_len, compression, + &comp); + + /* Write start of chunk */ + png_write_chunk_start(png_ptr, png_zTXt, + (png_uint_32)(key_len+text_len + 2)); + + /* Write key */ + png_write_chunk_data(png_ptr, (png_bytep)new_key, + (png_size_t)(key_len + 1)); + + png_free(png_ptr, new_key); + + buf = (png_byte)compression; + + /* Write compression */ + png_write_chunk_data(png_ptr, &buf, (png_size_t)1); + + /* Write the compressed data */ + png_write_compressed_data_out(png_ptr, &comp); + + /* Close the chunk */ + png_write_chunk_end(png_ptr); +} +#endif + +#ifdef PNG_WRITE_iTXt_SUPPORTED +/* Write an iTXt chunk */ +void /* PRIVATE */ +png_write_iTXt(png_structp png_ptr, int compression, png_const_charp key, + png_const_charp lang, png_const_charp lang_key, png_const_charp text) +{ + PNG_iTXt; + png_size_t lang_len, key_len, lang_key_len, text_len; + png_charp new_lang; + png_charp new_key = NULL; + png_byte cbuf[2]; + compression_state comp; + + png_debug(1, "in png_write_iTXt"); + + comp.num_output_ptr = 0; + comp.max_output_ptr = 0; + comp.output_ptr = NULL; + comp.input = NULL; + + if ((key_len = png_check_keyword(png_ptr, key, &new_key)) == 0) + return; + + if ((lang_len = png_check_keyword(png_ptr, lang, &new_lang)) == 0) + { + png_warning(png_ptr, "Empty language field in iTXt chunk"); + new_lang = NULL; + lang_len = 0; + } + + if (lang_key == NULL) + lang_key_len = 0; + + else + lang_key_len = png_strlen(lang_key); + + if (text == NULL) + text_len = 0; + + else + text_len = png_strlen(text); + + /* Compute the compressed data; do it now for the length */ + text_len = png_text_compress(png_ptr, text, text_len, compression - 2, + &comp); + + + /* Make sure we include the compression flag, the compression byte, + * and the NULs after the key, lang, and lang_key parts + */ + + png_write_chunk_start(png_ptr, png_iTXt, (png_uint_32)( + 5 /* comp byte, comp flag, terminators for key, lang and lang_key */ + + key_len + + lang_len + + lang_key_len + + text_len)); + + /* We leave it to the application to meet PNG-1.0 requirements on the + * contents of the text. PNG-1.0 through PNG-1.2 discourage the use of + * any non-Latin-1 characters except for NEWLINE. ISO PNG will forbid them. + * The NUL character is forbidden by PNG-1.0 through PNG-1.2 and ISO PNG. + */ + png_write_chunk_data(png_ptr, (png_bytep)new_key, (png_size_t)(key_len + 1)); + + /* Set the compression flag */ + if (compression == PNG_ITXT_COMPRESSION_NONE || + compression == PNG_TEXT_COMPRESSION_NONE) + cbuf[0] = 0; + + else /* compression == PNG_ITXT_COMPRESSION_zTXt */ + cbuf[0] = 1; + + /* Set the compression method */ + cbuf[1] = 0; + + png_write_chunk_data(png_ptr, cbuf, (png_size_t)2); + + cbuf[0] = 0; + png_write_chunk_data(png_ptr, (new_lang ? (png_const_bytep)new_lang : cbuf), + (png_size_t)(lang_len + 1)); + + png_write_chunk_data(png_ptr, (lang_key ? (png_const_bytep)lang_key : cbuf), + (png_size_t)(lang_key_len + 1)); + + png_write_compressed_data_out(png_ptr, &comp); + + png_write_chunk_end(png_ptr); + + png_free(png_ptr, new_key); + png_free(png_ptr, new_lang); +} +#endif + +#ifdef PNG_WRITE_oFFs_SUPPORTED +/* Write the oFFs chunk */ +void /* PRIVATE */ +png_write_oFFs(png_structp png_ptr, png_int_32 x_offset, png_int_32 y_offset, + int unit_type) +{ + PNG_oFFs; + png_byte buf[9]; + + png_debug(1, "in png_write_oFFs"); + + if (unit_type >= PNG_OFFSET_LAST) + png_warning(png_ptr, "Unrecognized unit type for oFFs chunk"); + + png_save_int_32(buf, x_offset); + png_save_int_32(buf + 4, y_offset); + buf[8] = (png_byte)unit_type; + + png_write_chunk(png_ptr, png_oFFs, buf, (png_size_t)9); +} +#endif +#ifdef PNG_WRITE_pCAL_SUPPORTED +/* Write the pCAL chunk (described in the PNG extensions document) */ +void /* PRIVATE */ +png_write_pCAL(png_structp png_ptr, png_charp purpose, png_int_32 X0, + png_int_32 X1, int type, int nparams, png_const_charp units, + png_charpp params) +{ + PNG_pCAL; + png_size_t purpose_len, units_len, total_len; + png_uint_32p params_len; + png_byte buf[10]; + png_charp new_purpose; + int i; + + png_debug1(1, "in png_write_pCAL (%d parameters)", nparams); + + if (type >= PNG_EQUATION_LAST) + png_warning(png_ptr, "Unrecognized equation type for pCAL chunk"); + + purpose_len = png_check_keyword(png_ptr, purpose, &new_purpose) + 1; + png_debug1(3, "pCAL purpose length = %d", (int)purpose_len); + units_len = png_strlen(units) + (nparams == 0 ? 0 : 1); + png_debug1(3, "pCAL units length = %d", (int)units_len); + total_len = purpose_len + units_len + 10; + + params_len = (png_uint_32p)png_malloc(png_ptr, + (png_alloc_size_t)(nparams * png_sizeof(png_uint_32))); + + /* Find the length of each parameter, making sure we don't count the + * null terminator for the last parameter. + */ + for (i = 0; i < nparams; i++) + { + params_len[i] = png_strlen(params[i]) + (i == nparams - 1 ? 0 : 1); + png_debug2(3, "pCAL parameter %d length = %lu", i, + (unsigned long)params_len[i]); + total_len += (png_size_t)params_len[i]; + } + + png_debug1(3, "pCAL total length = %d", (int)total_len); + png_write_chunk_start(png_ptr, png_pCAL, (png_uint_32)total_len); + png_write_chunk_data(png_ptr, (png_const_bytep)new_purpose, + (png_size_t)purpose_len); + png_save_int_32(buf, X0); + png_save_int_32(buf + 4, X1); + buf[8] = (png_byte)type; + buf[9] = (png_byte)nparams; + png_write_chunk_data(png_ptr, buf, (png_size_t)10); + png_write_chunk_data(png_ptr, (png_const_bytep)units, (png_size_t)units_len); + + png_free(png_ptr, new_purpose); + + for (i = 0; i < nparams; i++) + { + png_write_chunk_data(png_ptr, (png_const_bytep)params[i], + (png_size_t)params_len[i]); + } + + png_free(png_ptr, params_len); + png_write_chunk_end(png_ptr); +} +#endif + +#ifdef PNG_WRITE_sCAL_SUPPORTED +/* Write the sCAL chunk */ +void /* PRIVATE */ +png_write_sCAL_s(png_structp png_ptr, int unit, png_const_charp width, + png_const_charp height) +{ + PNG_sCAL; + png_byte buf[64]; + png_size_t wlen, hlen, total_len; + + png_debug(1, "in png_write_sCAL_s"); + + wlen = png_strlen(width); + hlen = png_strlen(height); + total_len = wlen + hlen + 2; + + if (total_len > 64) + { + png_warning(png_ptr, "Can't write sCAL (buffer too small)"); + return; + } + + buf[0] = (png_byte)unit; + png_memcpy(buf + 1, width, wlen + 1); /* Append the '\0' here */ + png_memcpy(buf + wlen + 2, height, hlen); /* Do NOT append the '\0' here */ + + png_debug1(3, "sCAL total length = %u", (unsigned int)total_len); + png_write_chunk(png_ptr, png_sCAL, buf, total_len); +} +#endif + +#ifdef PNG_WRITE_pHYs_SUPPORTED +/* Write the pHYs chunk */ +void /* PRIVATE */ +png_write_pHYs(png_structp png_ptr, png_uint_32 x_pixels_per_unit, + png_uint_32 y_pixels_per_unit, + int unit_type) +{ + PNG_pHYs; + png_byte buf[9]; + + png_debug(1, "in png_write_pHYs"); + + if (unit_type >= PNG_RESOLUTION_LAST) + png_warning(png_ptr, "Unrecognized unit type for pHYs chunk"); + + png_save_uint_32(buf, x_pixels_per_unit); + png_save_uint_32(buf + 4, y_pixels_per_unit); + buf[8] = (png_byte)unit_type; + + png_write_chunk(png_ptr, png_pHYs, buf, (png_size_t)9); +} +#endif + +#ifdef PNG_WRITE_tIME_SUPPORTED +/* Write the tIME chunk. Use either png_convert_from_struct_tm() + * or png_convert_from_time_t(), or fill in the structure yourself. + */ +void /* PRIVATE */ +png_write_tIME(png_structp png_ptr, png_const_timep mod_time) +{ + PNG_tIME; + png_byte buf[7]; + + png_debug(1, "in png_write_tIME"); + + if (mod_time->month > 12 || mod_time->month < 1 || + mod_time->day > 31 || mod_time->day < 1 || + mod_time->hour > 23 || mod_time->second > 60) + { + png_warning(png_ptr, "Invalid time specified for tIME chunk"); + return; + } + + png_save_uint_16(buf, mod_time->year); + buf[2] = mod_time->month; + buf[3] = mod_time->day; + buf[4] = mod_time->hour; + buf[5] = mod_time->minute; + buf[6] = mod_time->second; + + png_write_chunk(png_ptr, png_tIME, buf, (png_size_t)7); +} +#endif + +/* Initializes the row writing capability of libpng */ +void /* PRIVATE */ +png_write_start_row(png_structp png_ptr) +{ +#ifdef PNG_WRITE_INTERLACING_SUPPORTED + /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */ + + /* Start of interlace block */ + int png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0}; + + /* Offset to next interlace block */ + int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1}; + + /* Start of interlace block in the y direction */ + int png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1}; + + /* Offset to next interlace block in the y direction */ + int png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2}; +#endif + + png_size_t buf_size; + + png_debug(1, "in png_write_start_row"); + + buf_size = (png_size_t)(PNG_ROWBYTES( + png_ptr->usr_channels*png_ptr->usr_bit_depth, png_ptr->width) + 1); + + /* Set up row buffer */ + png_ptr->row_buf = (png_bytep)png_malloc(png_ptr, + (png_alloc_size_t)buf_size); + + png_ptr->row_buf[0] = PNG_FILTER_VALUE_NONE; + +#ifdef PNG_WRITE_FILTER_SUPPORTED + /* Set up filtering buffer, if using this filter */ + if (png_ptr->do_filter & PNG_FILTER_SUB) + { + png_ptr->sub_row = (png_bytep)png_malloc(png_ptr, png_ptr->rowbytes + 1); + + png_ptr->sub_row[0] = PNG_FILTER_VALUE_SUB; + } + + /* We only need to keep the previous row if we are using one of these. */ + if (png_ptr->do_filter & (PNG_FILTER_AVG | PNG_FILTER_UP | PNG_FILTER_PAETH)) + { + /* Set up previous row buffer */ + png_ptr->prev_row = (png_bytep)png_calloc(png_ptr, + (png_alloc_size_t)buf_size); + + if (png_ptr->do_filter & PNG_FILTER_UP) + { + png_ptr->up_row = (png_bytep)png_malloc(png_ptr, + png_ptr->rowbytes + 1); + + png_ptr->up_row[0] = PNG_FILTER_VALUE_UP; + } + + if (png_ptr->do_filter & PNG_FILTER_AVG) + { + png_ptr->avg_row = (png_bytep)png_malloc(png_ptr, + png_ptr->rowbytes + 1); + + png_ptr->avg_row[0] = PNG_FILTER_VALUE_AVG; + } + + if (png_ptr->do_filter & PNG_FILTER_PAETH) + { + png_ptr->paeth_row = (png_bytep)png_malloc(png_ptr, + png_ptr->rowbytes + 1); + + png_ptr->paeth_row[0] = PNG_FILTER_VALUE_PAETH; + } + } +#endif /* PNG_WRITE_FILTER_SUPPORTED */ + +#ifdef PNG_WRITE_INTERLACING_SUPPORTED + /* If interlaced, we need to set up width and height of pass */ + if (png_ptr->interlaced) + { + if (!(png_ptr->transformations & PNG_INTERLACE)) + { + png_ptr->num_rows = (png_ptr->height + png_pass_yinc[0] - 1 - + png_pass_ystart[0]) / png_pass_yinc[0]; + + png_ptr->usr_width = (png_ptr->width + png_pass_inc[0] - 1 - + png_pass_start[0]) / png_pass_inc[0]; + } + + else + { + png_ptr->num_rows = png_ptr->height; + png_ptr->usr_width = png_ptr->width; + } + } + + else +#endif + { + png_ptr->num_rows = png_ptr->height; + png_ptr->usr_width = png_ptr->width; + } + + png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; + png_ptr->zstream.next_out = png_ptr->zbuf; +} + +/* Internal use only. Called when finished processing a row of data. */ +void /* PRIVATE */ +png_write_finish_row(png_structp png_ptr) +{ +#ifdef PNG_WRITE_INTERLACING_SUPPORTED + /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */ + + /* Start of interlace block */ + int png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0}; + + /* Offset to next interlace block */ + int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1}; + + /* Start of interlace block in the y direction */ + int png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1}; + + /* Offset to next interlace block in the y direction */ + int png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2}; +#endif + + int ret; + + png_debug(1, "in png_write_finish_row"); + + /* Next row */ + png_ptr->row_number++; + + /* See if we are done */ + if (png_ptr->row_number < png_ptr->num_rows) + return; + +#ifdef PNG_WRITE_INTERLACING_SUPPORTED + /* If interlaced, go to next pass */ + if (png_ptr->interlaced) + { + png_ptr->row_number = 0; + if (png_ptr->transformations & PNG_INTERLACE) + { + png_ptr->pass++; + } + + else + { + /* Loop until we find a non-zero width or height pass */ + do + { + png_ptr->pass++; + + if (png_ptr->pass >= 7) + break; + + png_ptr->usr_width = (png_ptr->width + + png_pass_inc[png_ptr->pass] - 1 - + png_pass_start[png_ptr->pass]) / + png_pass_inc[png_ptr->pass]; + + png_ptr->num_rows = (png_ptr->height + + png_pass_yinc[png_ptr->pass] - 1 - + png_pass_ystart[png_ptr->pass]) / + png_pass_yinc[png_ptr->pass]; + + if (png_ptr->transformations & PNG_INTERLACE) + break; + + } while (png_ptr->usr_width == 0 || png_ptr->num_rows == 0); + + } + + /* Reset the row above the image for the next pass */ + if (png_ptr->pass < 7) + { + if (png_ptr->prev_row != NULL) + png_memset(png_ptr->prev_row, 0, + (png_size_t)(PNG_ROWBYTES(png_ptr->usr_channels* + png_ptr->usr_bit_depth, png_ptr->width)) + 1); + + return; + } + } +#endif + + /* If we get here, we've just written the last row, so we need + to flush the compressor */ + do + { + /* Tell the compressor we are done */ + ret = deflate(&png_ptr->zstream, Z_FINISH); + + /* Check for an error */ + if (ret == Z_OK) + { + /* Check to see if we need more room */ + if (!(png_ptr->zstream.avail_out)) + { + png_write_IDAT(png_ptr, png_ptr->zbuf, png_ptr->zbuf_size); + png_ptr->zstream.next_out = png_ptr->zbuf; + png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; + } + } + + else if (ret != Z_STREAM_END) + { + if (png_ptr->zstream.msg != NULL) + png_error(png_ptr, png_ptr->zstream.msg); + + else + png_error(png_ptr, "zlib error"); + } + } while (ret != Z_STREAM_END); + + /* Write any extra space */ + if (png_ptr->zstream.avail_out < png_ptr->zbuf_size) + { + png_write_IDAT(png_ptr, png_ptr->zbuf, png_ptr->zbuf_size - + png_ptr->zstream.avail_out); + } + + deflateReset(&png_ptr->zstream); + png_ptr->zstream.data_type = Z_BINARY; +} + +#ifdef PNG_WRITE_INTERLACING_SUPPORTED +/* Pick out the correct pixels for the interlace pass. + * The basic idea here is to go through the row with a source + * pointer and a destination pointer (sp and dp), and copy the + * correct pixels for the pass. As the row gets compacted, + * sp will always be >= dp, so we should never overwrite anything. + * See the default: case for the easiest code to understand. + */ +void /* PRIVATE */ +png_do_write_interlace(png_row_infop row_info, png_bytep row, int pass) +{ + /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */ + + /* Start of interlace block */ + int png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0}; + + /* Offset to next interlace block */ + int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1}; + + png_debug(1, "in png_do_write_interlace"); + + /* We don't have to do anything on the last pass (6) */ + if (pass < 6) + { + /* Each pixel depth is handled separately */ + switch (row_info->pixel_depth) + { + case 1: + { + png_bytep sp; + png_bytep dp; + int shift; + int d; + int value; + png_uint_32 i; + png_uint_32 row_width = row_info->width; + + dp = row; + d = 0; + shift = 7; + + for (i = png_pass_start[pass]; i < row_width; + i += png_pass_inc[pass]) + { + sp = row + (png_size_t)(i >> 3); + value = (int)(*sp >> (7 - (int)(i & 0x07))) & 0x01; + d |= (value << shift); + + if (shift == 0) + { + shift = 7; + *dp++ = (png_byte)d; + d = 0; + } + + else + shift--; + + } + if (shift != 7) + *dp = (png_byte)d; + + break; + } + + case 2: + { + png_bytep sp; + png_bytep dp; + int shift; + int d; + int value; + png_uint_32 i; + png_uint_32 row_width = row_info->width; + + dp = row; + shift = 6; + d = 0; + + for (i = png_pass_start[pass]; i < row_width; + i += png_pass_inc[pass]) + { + sp = row + (png_size_t)(i >> 2); + value = (*sp >> ((3 - (int)(i & 0x03)) << 1)) & 0x03; + d |= (value << shift); + + if (shift == 0) + { + shift = 6; + *dp++ = (png_byte)d; + d = 0; + } + + else + shift -= 2; + } + if (shift != 6) + *dp = (png_byte)d; + + break; + } + + case 4: + { + png_bytep sp; + png_bytep dp; + int shift; + int d; + int value; + png_uint_32 i; + png_uint_32 row_width = row_info->width; + + dp = row; + shift = 4; + d = 0; + for (i = png_pass_start[pass]; i < row_width; + i += png_pass_inc[pass]) + { + sp = row + (png_size_t)(i >> 1); + value = (*sp >> ((1 - (int)(i & 0x01)) << 2)) & 0x0f; + d |= (value << shift); + + if (shift == 0) + { + shift = 4; + *dp++ = (png_byte)d; + d = 0; + } + + else + shift -= 4; + } + if (shift != 4) + *dp = (png_byte)d; + + break; + } + + default: + { + png_bytep sp; + png_bytep dp; + png_uint_32 i; + png_uint_32 row_width = row_info->width; + png_size_t pixel_bytes; + + /* Start at the beginning */ + dp = row; + + /* Find out how many bytes each pixel takes up */ + pixel_bytes = (row_info->pixel_depth >> 3); + + /* Loop through the row, only looking at the pixels that matter */ + for (i = png_pass_start[pass]; i < row_width; + i += png_pass_inc[pass]) + { + /* Find out where the original pixel is */ + sp = row + (png_size_t)i * pixel_bytes; + + /* Move the pixel */ + if (dp != sp) + png_memcpy(dp, sp, pixel_bytes); + + /* Next pixel */ + dp += pixel_bytes; + } + break; + } + } + /* Set new row width */ + row_info->width = (row_info->width + + png_pass_inc[pass] - 1 - + png_pass_start[pass]) / + png_pass_inc[pass]; + + row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, + row_info->width); + } +} +#endif + +/* This filters the row, chooses which filter to use, if it has not already + * been specified by the application, and then writes the row out with the + * chosen filter. + */ +#define PNG_MAXSUM (((png_uint_32)(-1)) >> 1) +#define PNG_HISHIFT 10 +#define PNG_LOMASK ((png_uint_32)0xffffL) +#define PNG_HIMASK ((png_uint_32)(~PNG_LOMASK >> PNG_HISHIFT)) +void /* PRIVATE */ +png_write_find_filter(png_structp png_ptr, png_row_infop row_info) +{ + png_bytep best_row; +#ifdef PNG_WRITE_FILTER_SUPPORTED + png_bytep prev_row, row_buf; + png_uint_32 mins, bpp; + png_byte filter_to_do = png_ptr->do_filter; + png_size_t row_bytes = row_info->rowbytes; +#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED + int num_p_filters = (int)png_ptr->num_prev_filters; +#endif + + png_debug(1, "in png_write_find_filter"); + +#ifndef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED + if (png_ptr->row_number == 0 && filter_to_do == PNG_ALL_FILTERS) + { + /* These will never be selected so we need not test them. */ + filter_to_do &= ~(PNG_FILTER_UP | PNG_FILTER_PAETH); + } +#endif + + /* Find out how many bytes offset each pixel is */ + bpp = (row_info->pixel_depth + 7) >> 3; + + prev_row = png_ptr->prev_row; +#endif + best_row = png_ptr->row_buf; +#ifdef PNG_WRITE_FILTER_SUPPORTED + row_buf = best_row; + mins = PNG_MAXSUM; + + /* The prediction method we use is to find which method provides the + * smallest value when summing the absolute values of the distances + * from zero, using anything >= 128 as negative numbers. This is known + * as the "minimum sum of absolute differences" heuristic. Other + * heuristics are the "weighted minimum sum of absolute differences" + * (experimental and can in theory improve compression), and the "zlib + * predictive" method (not implemented yet), which does test compressions + * of lines using different filter methods, and then chooses the + * (series of) filter(s) that give minimum compressed data size (VERY + * computationally expensive). + * + * GRR 980525: consider also + * + * (1) minimum sum of absolute differences from running average (i.e., + * keep running sum of non-absolute differences & count of bytes) + * [track dispersion, too? restart average if dispersion too large?] + * + * (1b) minimum sum of absolute differences from sliding average, probably + * with window size <= deflate window (usually 32K) + * + * (2) minimum sum of squared differences from zero or running average + * (i.e., ~ root-mean-square approach) + */ + + + /* We don't need to test the 'no filter' case if this is the only filter + * that has been chosen, as it doesn't actually do anything to the data. + */ + if ((filter_to_do & PNG_FILTER_NONE) && filter_to_do != PNG_FILTER_NONE) + { + png_bytep rp; + png_uint_32 sum = 0; + png_size_t i; + int v; + + for (i = 0, rp = row_buf + 1; i < row_bytes; i++, rp++) + { + v = *rp; + sum += (v < 128) ? v : 256 - v; + } + +#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED + if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED) + { + png_uint_32 sumhi, sumlo; + int j; + sumlo = sum & PNG_LOMASK; + sumhi = (sum >> PNG_HISHIFT) & PNG_HIMASK; /* Gives us some footroom */ + + /* Reduce the sum if we match any of the previous rows */ + for (j = 0; j < num_p_filters; j++) + { + if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_NONE) + { + sumlo = (sumlo * png_ptr->filter_weights[j]) >> + PNG_WEIGHT_SHIFT; + + sumhi = (sumhi * png_ptr->filter_weights[j]) >> + PNG_WEIGHT_SHIFT; + } + } + + /* Factor in the cost of this filter (this is here for completeness, + * but it makes no sense to have a "cost" for the NONE filter, as + * it has the minimum possible computational cost - none). + */ + sumlo = (sumlo * png_ptr->filter_costs[PNG_FILTER_VALUE_NONE]) >> + PNG_COST_SHIFT; + + sumhi = (sumhi * png_ptr->filter_costs[PNG_FILTER_VALUE_NONE]) >> + PNG_COST_SHIFT; + + if (sumhi > PNG_HIMASK) + sum = PNG_MAXSUM; + + else + sum = (sumhi << PNG_HISHIFT) + sumlo; + } +#endif + mins = sum; + } + + /* Sub filter */ + if (filter_to_do == PNG_FILTER_SUB) + /* It's the only filter so no testing is needed */ + { + png_bytep rp, lp, dp; + png_size_t i; + + for (i = 0, rp = row_buf + 1, dp = png_ptr->sub_row + 1; i < bpp; + i++, rp++, dp++) + { + *dp = *rp; + } + + for (lp = row_buf + 1; i < row_bytes; + i++, rp++, lp++, dp++) + { + *dp = (png_byte)(((int)*rp - (int)*lp) & 0xff); + } + + best_row = png_ptr->sub_row; + } + + else if (filter_to_do & PNG_FILTER_SUB) + { + png_bytep rp, dp, lp; + png_uint_32 sum = 0, lmins = mins; + png_size_t i; + int v; + +#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED + /* We temporarily increase the "minimum sum" by the factor we + * would reduce the sum of this filter, so that we can do the + * early exit comparison without scaling the sum each time. + */ + if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED) + { + int j; + png_uint_32 lmhi, lmlo; + lmlo = lmins & PNG_LOMASK; + lmhi = (lmins >> PNG_HISHIFT) & PNG_HIMASK; + + for (j = 0; j < num_p_filters; j++) + { + if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_SUB) + { + lmlo = (lmlo * png_ptr->inv_filter_weights[j]) >> + PNG_WEIGHT_SHIFT; + + lmhi = (lmhi * png_ptr->inv_filter_weights[j]) >> + PNG_WEIGHT_SHIFT; + } + } + + lmlo = (lmlo * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_SUB]) >> + PNG_COST_SHIFT; + + lmhi = (lmhi * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_SUB]) >> + PNG_COST_SHIFT; + + if (lmhi > PNG_HIMASK) + lmins = PNG_MAXSUM; + + else + lmins = (lmhi << PNG_HISHIFT) + lmlo; + } +#endif + + for (i = 0, rp = row_buf + 1, dp = png_ptr->sub_row + 1; i < bpp; + i++, rp++, dp++) + { + v = *dp = *rp; + + sum += (v < 128) ? v : 256 - v; + } + + for (lp = row_buf + 1; i < row_bytes; + i++, rp++, lp++, dp++) + { + v = *dp = (png_byte)(((int)*rp - (int)*lp) & 0xff); + + sum += (v < 128) ? v : 256 - v; + + if (sum > lmins) /* We are already worse, don't continue. */ + break; + } + +#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED + if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED) + { + int j; + png_uint_32 sumhi, sumlo; + sumlo = sum & PNG_LOMASK; + sumhi = (sum >> PNG_HISHIFT) & PNG_HIMASK; + + for (j = 0; j < num_p_filters; j++) + { + if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_SUB) + { + sumlo = (sumlo * png_ptr->inv_filter_weights[j]) >> + PNG_WEIGHT_SHIFT; + + sumhi = (sumhi * png_ptr->inv_filter_weights[j]) >> + PNG_WEIGHT_SHIFT; + } + } + + sumlo = (sumlo * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_SUB]) >> + PNG_COST_SHIFT; + + sumhi = (sumhi * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_SUB]) >> + PNG_COST_SHIFT; + + if (sumhi > PNG_HIMASK) + sum = PNG_MAXSUM; + + else + sum = (sumhi << PNG_HISHIFT) + sumlo; + } +#endif + + if (sum < mins) + { + mins = sum; + best_row = png_ptr->sub_row; + } + } + + /* Up filter */ + if (filter_to_do == PNG_FILTER_UP) + { + png_bytep rp, dp, pp; + png_size_t i; + + for (i = 0, rp = row_buf + 1, dp = png_ptr->up_row + 1, + pp = prev_row + 1; i < row_bytes; + i++, rp++, pp++, dp++) + { + *dp = (png_byte)(((int)*rp - (int)*pp) & 0xff); + } + + best_row = png_ptr->up_row; + } + + else if (filter_to_do & PNG_FILTER_UP) + { + png_bytep rp, dp, pp; + png_uint_32 sum = 0, lmins = mins; + png_size_t i; + int v; + + +#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED + if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED) + { + int j; + png_uint_32 lmhi, lmlo; + lmlo = lmins & PNG_LOMASK; + lmhi = (lmins >> PNG_HISHIFT) & PNG_HIMASK; + + for (j = 0; j < num_p_filters; j++) + { + if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_UP) + { + lmlo = (lmlo * png_ptr->inv_filter_weights[j]) >> + PNG_WEIGHT_SHIFT; + + lmhi = (lmhi * png_ptr->inv_filter_weights[j]) >> + PNG_WEIGHT_SHIFT; + } + } + + lmlo = (lmlo * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_UP]) >> + PNG_COST_SHIFT; + + lmhi = (lmhi * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_UP]) >> + PNG_COST_SHIFT; + + if (lmhi > PNG_HIMASK) + lmins = PNG_MAXSUM; + + else + lmins = (lmhi << PNG_HISHIFT) + lmlo; + } +#endif + + for (i = 0, rp = row_buf + 1, dp = png_ptr->up_row + 1, + pp = prev_row + 1; i < row_bytes; i++) + { + v = *dp++ = (png_byte)(((int)*rp++ - (int)*pp++) & 0xff); + + sum += (v < 128) ? v : 256 - v; + + if (sum > lmins) /* We are already worse, don't continue. */ + break; + } + +#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED + if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED) + { + int j; + png_uint_32 sumhi, sumlo; + sumlo = sum & PNG_LOMASK; + sumhi = (sum >> PNG_HISHIFT) & PNG_HIMASK; + + for (j = 0; j < num_p_filters; j++) + { + if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_UP) + { + sumlo = (sumlo * png_ptr->filter_weights[j]) >> + PNG_WEIGHT_SHIFT; + + sumhi = (sumhi * png_ptr->filter_weights[j]) >> + PNG_WEIGHT_SHIFT; + } + } + + sumlo = (sumlo * png_ptr->filter_costs[PNG_FILTER_VALUE_UP]) >> + PNG_COST_SHIFT; + + sumhi = (sumhi * png_ptr->filter_costs[PNG_FILTER_VALUE_UP]) >> + PNG_COST_SHIFT; + + if (sumhi > PNG_HIMASK) + sum = PNG_MAXSUM; + + else + sum = (sumhi << PNG_HISHIFT) + sumlo; + } +#endif + + if (sum < mins) + { + mins = sum; + best_row = png_ptr->up_row; + } + } + + /* Avg filter */ + if (filter_to_do == PNG_FILTER_AVG) + { + png_bytep rp, dp, pp, lp; + png_uint_32 i; + + for (i = 0, rp = row_buf + 1, dp = png_ptr->avg_row + 1, + pp = prev_row + 1; i < bpp; i++) + { + *dp++ = (png_byte)(((int)*rp++ - ((int)*pp++ / 2)) & 0xff); + } + + for (lp = row_buf + 1; i < row_bytes; i++) + { + *dp++ = (png_byte)(((int)*rp++ - (((int)*pp++ + (int)*lp++) / 2)) + & 0xff); + } + best_row = png_ptr->avg_row; + } + + else if (filter_to_do & PNG_FILTER_AVG) + { + png_bytep rp, dp, pp, lp; + png_uint_32 sum = 0, lmins = mins; + png_size_t i; + int v; + +#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED + if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED) + { + int j; + png_uint_32 lmhi, lmlo; + lmlo = lmins & PNG_LOMASK; + lmhi = (lmins >> PNG_HISHIFT) & PNG_HIMASK; + + for (j = 0; j < num_p_filters; j++) + { + if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_AVG) + { + lmlo = (lmlo * png_ptr->inv_filter_weights[j]) >> + PNG_WEIGHT_SHIFT; + + lmhi = (lmhi * png_ptr->inv_filter_weights[j]) >> + PNG_WEIGHT_SHIFT; + } + } + + lmlo = (lmlo * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_AVG]) >> + PNG_COST_SHIFT; + + lmhi = (lmhi * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_AVG]) >> + PNG_COST_SHIFT; + + if (lmhi > PNG_HIMASK) + lmins = PNG_MAXSUM; + + else + lmins = (lmhi << PNG_HISHIFT) + lmlo; + } +#endif + + for (i = 0, rp = row_buf + 1, dp = png_ptr->avg_row + 1, + pp = prev_row + 1; i < bpp; i++) + { + v = *dp++ = (png_byte)(((int)*rp++ - ((int)*pp++ / 2)) & 0xff); + + sum += (v < 128) ? v : 256 - v; + } + + for (lp = row_buf + 1; i < row_bytes; i++) + { + v = *dp++ = + (png_byte)(((int)*rp++ - (((int)*pp++ + (int)*lp++) / 2)) & 0xff); + + sum += (v < 128) ? v : 256 - v; + + if (sum > lmins) /* We are already worse, don't continue. */ + break; + } + +#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED + if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED) + { + int j; + png_uint_32 sumhi, sumlo; + sumlo = sum & PNG_LOMASK; + sumhi = (sum >> PNG_HISHIFT) & PNG_HIMASK; + + for (j = 0; j < num_p_filters; j++) + { + if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_NONE) + { + sumlo = (sumlo * png_ptr->filter_weights[j]) >> + PNG_WEIGHT_SHIFT; + + sumhi = (sumhi * png_ptr->filter_weights[j]) >> + PNG_WEIGHT_SHIFT; + } + } + + sumlo = (sumlo * png_ptr->filter_costs[PNG_FILTER_VALUE_AVG]) >> + PNG_COST_SHIFT; + + sumhi = (sumhi * png_ptr->filter_costs[PNG_FILTER_VALUE_AVG]) >> + PNG_COST_SHIFT; + + if (sumhi > PNG_HIMASK) + sum = PNG_MAXSUM; + + else + sum = (sumhi << PNG_HISHIFT) + sumlo; + } +#endif + + if (sum < mins) + { + mins = sum; + best_row = png_ptr->avg_row; + } + } + + /* Paeth filter */ + if (filter_to_do == PNG_FILTER_PAETH) + { + png_bytep rp, dp, pp, cp, lp; + png_size_t i; + + for (i = 0, rp = row_buf + 1, dp = png_ptr->paeth_row + 1, + pp = prev_row + 1; i < bpp; i++) + { + *dp++ = (png_byte)(((int)*rp++ - (int)*pp++) & 0xff); + } + + for (lp = row_buf + 1, cp = prev_row + 1; i < row_bytes; i++) + { + int a, b, c, pa, pb, pc, p; + + b = *pp++; + c = *cp++; + a = *lp++; + + p = b - c; + pc = a - c; + +#ifdef PNG_USE_ABS + pa = abs(p); + pb = abs(pc); + pc = abs(p + pc); +#else + pa = p < 0 ? -p : p; + pb = pc < 0 ? -pc : pc; + pc = (p + pc) < 0 ? -(p + pc) : p + pc; +#endif + + p = (pa <= pb && pa <=pc) ? a : (pb <= pc) ? b : c; + + *dp++ = (png_byte)(((int)*rp++ - p) & 0xff); + } + best_row = png_ptr->paeth_row; + } + + else if (filter_to_do & PNG_FILTER_PAETH) + { + png_bytep rp, dp, pp, cp, lp; + png_uint_32 sum = 0, lmins = mins; + png_size_t i; + int v; + +#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED + if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED) + { + int j; + png_uint_32 lmhi, lmlo; + lmlo = lmins & PNG_LOMASK; + lmhi = (lmins >> PNG_HISHIFT) & PNG_HIMASK; + + for (j = 0; j < num_p_filters; j++) + { + if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_PAETH) + { + lmlo = (lmlo * png_ptr->inv_filter_weights[j]) >> + PNG_WEIGHT_SHIFT; + + lmhi = (lmhi * png_ptr->inv_filter_weights[j]) >> + PNG_WEIGHT_SHIFT; + } + } + + lmlo = (lmlo * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_PAETH]) >> + PNG_COST_SHIFT; + + lmhi = (lmhi * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_PAETH]) >> + PNG_COST_SHIFT; + + if (lmhi > PNG_HIMASK) + lmins = PNG_MAXSUM; + + else + lmins = (lmhi << PNG_HISHIFT) + lmlo; + } +#endif + + for (i = 0, rp = row_buf + 1, dp = png_ptr->paeth_row + 1, + pp = prev_row + 1; i < bpp; i++) + { + v = *dp++ = (png_byte)(((int)*rp++ - (int)*pp++) & 0xff); + + sum += (v < 128) ? v : 256 - v; + } + + for (lp = row_buf + 1, cp = prev_row + 1; i < row_bytes; i++) + { + int a, b, c, pa, pb, pc, p; + + b = *pp++; + c = *cp++; + a = *lp++; + +#ifndef PNG_SLOW_PAETH + p = b - c; + pc = a - c; +#ifdef PNG_USE_ABS + pa = abs(p); + pb = abs(pc); + pc = abs(p + pc); +#else + pa = p < 0 ? -p : p; + pb = pc < 0 ? -pc : pc; + pc = (p + pc) < 0 ? -(p + pc) : p + pc; +#endif + p = (pa <= pb && pa <=pc) ? a : (pb <= pc) ? b : c; +#else /* PNG_SLOW_PAETH */ + p = a + b - c; + pa = abs(p - a); + pb = abs(p - b); + pc = abs(p - c); + + if (pa <= pb && pa <= pc) + p = a; + + else if (pb <= pc) + p = b; + + else + p = c; +#endif /* PNG_SLOW_PAETH */ + + v = *dp++ = (png_byte)(((int)*rp++ - p) & 0xff); + + sum += (v < 128) ? v : 256 - v; + + if (sum > lmins) /* We are already worse, don't continue. */ + break; + } + +#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED + if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED) + { + int j; + png_uint_32 sumhi, sumlo; + sumlo = sum & PNG_LOMASK; + sumhi = (sum >> PNG_HISHIFT) & PNG_HIMASK; + + for (j = 0; j < num_p_filters; j++) + { + if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_PAETH) + { + sumlo = (sumlo * png_ptr->filter_weights[j]) >> + PNG_WEIGHT_SHIFT; + + sumhi = (sumhi * png_ptr->filter_weights[j]) >> + PNG_WEIGHT_SHIFT; + } + } + + sumlo = (sumlo * png_ptr->filter_costs[PNG_FILTER_VALUE_PAETH]) >> + PNG_COST_SHIFT; + + sumhi = (sumhi * png_ptr->filter_costs[PNG_FILTER_VALUE_PAETH]) >> + PNG_COST_SHIFT; + + if (sumhi > PNG_HIMASK) + sum = PNG_MAXSUM; + + else + sum = (sumhi << PNG_HISHIFT) + sumlo; + } +#endif + + if (sum < mins) + { + best_row = png_ptr->paeth_row; + } + } +#endif /* PNG_WRITE_FILTER_SUPPORTED */ + /* Do the actual writing of the filtered row data from the chosen filter. */ + + png_write_filtered_row(png_ptr, best_row); + +#ifdef PNG_WRITE_FILTER_SUPPORTED +#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED + /* Save the type of filter we picked this time for future calculations */ + if (png_ptr->num_prev_filters > 0) + { + int j; + + for (j = 1; j < num_p_filters; j++) + { + png_ptr->prev_filters[j] = png_ptr->prev_filters[j - 1]; + } + + png_ptr->prev_filters[j] = best_row[0]; + } +#endif +#endif /* PNG_WRITE_FILTER_SUPPORTED */ +} + + +/* Do the actual writing of a previously filtered row. */ +void /* PRIVATE */ +png_write_filtered_row(png_structp png_ptr, png_bytep filtered_row) +{ + png_size_t avail; + + png_debug(1, "in png_write_filtered_row"); + + png_debug1(2, "filter = %d", filtered_row[0]); + /* Set up the zlib input buffer */ + + png_ptr->zstream.next_in = filtered_row; + png_ptr->zstream.avail_in = 0; + avail = png_ptr->row_info.rowbytes + 1; + /* Repeat until we have compressed all the data */ + do + { + int ret; /* Return of zlib */ + + /* Record the number of bytes available - zlib supports at least 65535 + * bytes at one step, depending on the size of the zlib type 'uInt', the + * maximum size zlib can write at once is ZLIB_IO_MAX (from pngpriv.h). + * Use this because on 16 bit systems 'rowbytes' can be up to 65536 (i.e. + * one more than 16 bits) and, in this case 'rowbytes+1' can overflow a + * uInt. ZLIB_IO_MAX can be safely reduced to cause zlib to be called + * with smaller chunks of data. + */ + if (png_ptr->zstream.avail_in == 0) + { + if (avail > ZLIB_IO_MAX) + { + png_ptr->zstream.avail_in = ZLIB_IO_MAX; + avail -= ZLIB_IO_MAX; + } + + else + { + /* So this will fit in the available uInt space: */ + png_ptr->zstream.avail_in = (uInt)avail; + avail = 0; + } + } + + /* Compress the data */ + ret = deflate(&png_ptr->zstream, Z_NO_FLUSH); + + /* Check for compression errors */ + if (ret != Z_OK) + { + if (png_ptr->zstream.msg != NULL) + png_error(png_ptr, png_ptr->zstream.msg); + + else + png_error(png_ptr, "zlib error"); + } + + /* See if it is time to write another IDAT */ + if (!(png_ptr->zstream.avail_out)) + { + /* Write the IDAT and reset the zlib output buffer */ + png_write_IDAT(png_ptr, png_ptr->zbuf, png_ptr->zbuf_size); + png_ptr->zstream.next_out = png_ptr->zbuf; + png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; + } + /* Repeat until all data has been compressed */ + } while (avail > 0 || png_ptr->zstream.avail_in > 0); + + /* Swap the current and previous rows */ + if (png_ptr->prev_row != NULL) + { + png_bytep tptr; + + tptr = png_ptr->prev_row; + png_ptr->prev_row = png_ptr->row_buf; + png_ptr->row_buf = tptr; + } + + /* Finish row - updates counters and flushes zlib if last row */ + png_write_finish_row(png_ptr); + +#ifdef PNG_WRITE_FLUSH_SUPPORTED + png_ptr->flush_rows++; + + if (png_ptr->flush_dist > 0 && + png_ptr->flush_rows >= png_ptr->flush_dist) + { + png_write_flush(png_ptr); + } +#endif +} +#endif /* PNG_WRITE_SUPPORTED */