1236 lines
46 KiB
C
1236 lines
46 KiB
C
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/* pngpriv.h - private declarations for use inside libpng
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*
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* For conditions of distribution and use, see copyright notice in png.h
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* Copyright (c) 1998-2011 Glenn Randers-Pehrson
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* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
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* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
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*
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* Last changed in libpng 1.5.0 [January 6, 2011]
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*
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* This code is released under the libpng license.
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* For conditions of distribution and use, see the disclaimer
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* and license in png.h
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*/
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/* The symbols declared in this file (including the functions declared
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* as PNG_EXTERN) are PRIVATE. They are not part of the libpng public
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* interface, and are not recommended for use by regular applications.
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* Some of them may become public in the future; others may stay private,
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* change in an incompatible way, or even disappear.
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* Although the libpng users are not forbidden to include this header,
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* they should be well aware of the issues that may arise from doing so.
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*/
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#ifndef PNGPRIV_H
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#define PNGPRIV_H
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/* This is required for the definition of abort(), used as a last ditch
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* error handler when all else fails.
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*/
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#include <stdlib.h>
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#define PNGLIB_BUILD
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#ifdef PNG_USER_CONFIG
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# include "pngusr.h"
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/* These should have been defined in pngusr.h */
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# ifndef PNG_USER_PRIVATEBUILD
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# define PNG_USER_PRIVATEBUILD "Custom libpng build"
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# endif
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# ifndef PNG_USER_DLLFNAME_POSTFIX
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# define PNG_USER_DLLFNAME_POSTFIX "Cb"
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# endif
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#endif
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#include "png.h"
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#include "pnginfo.h"
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#include "pngstruct.h"
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/* This is used for 16 bit gamma tables - only the top level pointers are const,
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* this could be changed:
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*/
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typedef PNG_CONST png_uint_16p FAR * png_const_uint_16pp;
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/* Added at libpng-1.2.9 */
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/* Moved to pngpriv.h at libpng-1.5.0 */
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/* config.h is created by and PNG_CONFIGURE_LIBPNG is set by the "configure"
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* script. We may need it here to get the correct configuration on things
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* like limits.
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*/
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#ifdef PNG_CONFIGURE_LIBPNG
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# ifdef HAVE_CONFIG_H
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# include "config.h"
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# endif
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#endif
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/* Moved to pngpriv.h at libpng-1.5.0 */
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/* NOTE: some of these may have been used in external applications as
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* these definitions were exposed in pngconf.h prior to 1.5.
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*/
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/* If you are running on a machine where you cannot allocate more
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* than 64K of memory at once, uncomment this. While libpng will not
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* normally need that much memory in a chunk (unless you load up a very
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* large file), zlib needs to know how big of a chunk it can use, and
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* libpng thus makes sure to check any memory allocation to verify it
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* will fit into memory.
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*
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* zlib provides 'MAXSEG_64K' which, if defined, indicates the
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* same limit and pngconf.h (already included) sets the limit
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* if certain operating systems are detected.
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*/
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#if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K)
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# define PNG_MAX_MALLOC_64K
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#endif
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/* Unused formal parameter warnings are silenced using the following macro
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* which is expected to have no bad effects on performance (optimizing
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* compilers will probably remove it entirely). Note that if you replace
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* it with something other than whitespace, you must include the terminating
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* semicolon.
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*/
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#define PNG_UNUSED(param) (void)param;
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/* Just a little check that someone hasn't tried to define something
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* contradictory.
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*/
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#if (PNG_ZBUF_SIZE > 65536L) && defined(PNG_MAX_MALLOC_64K)
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# undef PNG_ZBUF_SIZE
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# define PNG_ZBUF_SIZE 65536L
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#endif
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/* If warnings or errors are turned off the code is disabled
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* or redirected here.
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*/
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#ifndef PNG_WARNINGS_SUPPORTED
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# define png_warning(s1,s2) ((void)0)
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# define png_chunk_warning(s1,s2) ((void)0)
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#endif
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#ifndef PNG_ERROR_TEXT_SUPPORTED
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# define png_error(s1,s2) png_err(s1)
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# define png_chunk_error(s1,s2) png_err(s1)
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# define png_fixed_error(s1,s2) png_err(s1)
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#endif
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#ifndef PNG_EXTERN
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/* The functions exported by PNG_EXTERN are internal functions, which
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* aren't usually used outside the library (as far as I know), so it is
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* debatable if they should be exported at all. In the future, when it
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* is possible to have run-time registry of chunk-handling functions,
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* some of these might be made available again.
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# define PNG_EXTERN extern
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*/
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# define PNG_EXTERN
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#endif
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/* Some fixed point APIs are still required even if not exported because
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* they get used by the corresponding floating point APIs. This magic
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* deals with this:
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*/
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#ifdef PNG_FIXED_POINT_SUPPORTED
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# define PNGFAPI PNGAPI
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#else
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# define PNGFAPI /* PRIVATE */
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#endif
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/* Other defines specific to compilers can go here. Try to keep
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* them inside an appropriate ifdef/endif pair for portability.
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*/
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#if defined(PNG_FLOATING_POINT_SUPPORTED) ||\
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defined(PNG_FLOATING_ARITHMETIC_SUPPORTED)
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/* png.c requires the following ANSI-C constants if the conversion of
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* floating point to ASCII is implemented therein:
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*
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* DBL_DIG Maximum number of decimal digits (can be set to any constant)
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* DBL_MIN Smallest normalized fp number (can be set to an arbitrary value)
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* DBL_MAX Maximum floating point number (can be set to an arbitrary value)
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*/
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# include <float.h>
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# if (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \
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defined(THINK_C) || defined(__SC__) || defined(TARGET_OS_MAC)
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/* We need to check that <math.h> hasn't already been included earlier
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* as it seems it doesn't agree with <fp.h>, yet we should really use
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* <fp.h> if possible.
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*/
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# if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__)
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# include <fp.h>
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# endif
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# else
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# include <math.h>
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# endif
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# if defined(_AMIGA) && defined(__SASC) && defined(_M68881)
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/* Amiga SAS/C: We must include builtin FPU functions when compiling using
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* MATH=68881
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*/
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# include <m68881.h>
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# endif
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#endif
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/* This provides the non-ANSI (far) memory allocation routines. */
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#if defined(__TURBOC__) && defined(__MSDOS__)
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# include <mem.h>
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# include <alloc.h>
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#endif
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/* Moved here around 1.5.0beta36 from pngconf.h */
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/* Users may want to use these so they are not private. Any library
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* functions that are passed far data must be model-independent.
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*/
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/* Memory model/platform independent fns */
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#ifndef PNG_ABORT
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# ifdef _WINDOWS_
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# define PNG_ABORT() ExitProcess(0)
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# else
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# define PNG_ABORT() abort()
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# endif
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#endif
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#ifdef USE_FAR_KEYWORD
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/* Use this to make far-to-near assignments */
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# define CHECK 1
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# define NOCHECK 0
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# define CVT_PTR(ptr) (png_far_to_near(png_ptr,ptr,CHECK))
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# define CVT_PTR_NOCHECK(ptr) (png_far_to_near(png_ptr,ptr,NOCHECK))
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# define png_strcpy _fstrcpy
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# define png_strncpy _fstrncpy /* Added to v 1.2.6 */
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# define png_strlen _fstrlen
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# define png_memcmp _fmemcmp /* SJT: added */
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# define png_memcpy _fmemcpy
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# define png_memset _fmemset
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# define png_sprintf sprintf
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#else
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# ifdef _WINDOWS_ /* Favor Windows over C runtime fns */
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# define CVT_PTR(ptr) (ptr)
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# define CVT_PTR_NOCHECK(ptr) (ptr)
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# define png_strcpy lstrcpyA
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# define png_strncpy lstrcpynA
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# define png_strlen lstrlenA
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# define png_memcmp memcmp
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# define png_memcpy CopyMemory
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# define png_memset memset
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# define png_sprintf wsprintfA
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# else
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# define CVT_PTR(ptr) (ptr)
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# define CVT_PTR_NOCHECK(ptr) (ptr)
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# define png_strcpy strcpy
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# define png_strncpy strncpy /* Added to v 1.2.6 */
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# define png_strlen strlen
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# define png_memcmp memcmp /* SJT: added */
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# define png_memcpy memcpy
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# define png_memset memset
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# define png_sprintf sprintf
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# endif
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#endif
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/* End of memory model/platform independent support */
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#ifndef PNG_NO_SNPRINTF
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# ifdef _MSC_VER
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# define png_snprintf _snprintf /* Added to v 1.2.19 */
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# define png_snprintf2 _snprintf
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# define png_snprintf6 _snprintf
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# else
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# define png_snprintf snprintf /* Added to v 1.2.19 */
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# define png_snprintf2 snprintf
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# define png_snprintf6 snprintf
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# endif
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#else
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/* You don't have or don't want to use snprintf(). Caution: Using
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* sprintf instead of snprintf exposes your application to accidental
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* or malevolent buffer overflows. If you don't have snprintf()
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* as a general rule you should provide one (you can get one from
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* Portable OpenSSH).
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*/
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# define png_snprintf(s1,n,fmt,x1) png_sprintf(s1,fmt,x1)
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# define png_snprintf2(s1,n,fmt,x1,x2) png_sprintf(s1,fmt,x1,x2)
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# define png_snprintf6(s1,n,fmt,x1,x2,x3,x4,x5,x6) \
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png_sprintf(s1,fmt,x1,x2,x3,x4,x5,x6)
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#endif
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/* End of 1.5.0beta36 move from pngconf.h */
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/* CONSTANTS and UTILITY MACROS
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* These are used internally by libpng and not exposed in the API
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*/
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/* Various modes of operation. Note that after an init, mode is set to
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* zero automatically when the structure is created.
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*/
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#define PNG_HAVE_IHDR 0x01
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#define PNG_HAVE_PLTE 0x02
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#define PNG_HAVE_IDAT 0x04
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#define PNG_AFTER_IDAT 0x08 /* Have complete zlib datastream */
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#define PNG_HAVE_IEND 0x10
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#define PNG_HAVE_gAMA 0x20
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#define PNG_HAVE_cHRM 0x40
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#define PNG_HAVE_sRGB 0x80
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#define PNG_HAVE_CHUNK_HEADER 0x100
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#define PNG_WROTE_tIME 0x200
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#define PNG_WROTE_INFO_BEFORE_PLTE 0x400
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#define PNG_BACKGROUND_IS_GRAY 0x800
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#define PNG_HAVE_PNG_SIGNATURE 0x1000
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#define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */
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/* Flags for the transformations the PNG library does on the image data */
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#define PNG_BGR 0x0001
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#define PNG_INTERLACE 0x0002
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#define PNG_PACK 0x0004
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#define PNG_SHIFT 0x0008
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#define PNG_SWAP_BYTES 0x0010
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#define PNG_INVERT_MONO 0x0020
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#define PNG_QUANTIZE 0x0040
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#define PNG_BACKGROUND 0x0080
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#define PNG_BACKGROUND_EXPAND 0x0100
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/* 0x0200 unused */
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#define PNG_16_TO_8 0x0400
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#define PNG_RGBA 0x0800
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#define PNG_EXPAND 0x1000
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#define PNG_GAMMA 0x2000
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#define PNG_GRAY_TO_RGB 0x4000
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#define PNG_FILLER 0x8000L
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#define PNG_PACKSWAP 0x10000L
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#define PNG_SWAP_ALPHA 0x20000L
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#define PNG_STRIP_ALPHA 0x40000L
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#define PNG_INVERT_ALPHA 0x80000L
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#define PNG_USER_TRANSFORM 0x100000L
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#define PNG_RGB_TO_GRAY_ERR 0x200000L
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#define PNG_RGB_TO_GRAY_WARN 0x400000L
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#define PNG_RGB_TO_GRAY 0x600000L /* two bits, RGB_TO_GRAY_ERR|WARN */
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/* 0x800000L Unused */
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#define PNG_ADD_ALPHA 0x1000000L /* Added to libpng-1.2.7 */
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#define PNG_EXPAND_tRNS 0x2000000L /* Added to libpng-1.2.9 */
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/* 0x4000000L unused */
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/* 0x8000000L unused */
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/* 0x10000000L unused */
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/* 0x20000000L unused */
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/* 0x40000000L unused */
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/* Flags for png_create_struct */
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#define PNG_STRUCT_PNG 0x0001
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#define PNG_STRUCT_INFO 0x0002
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/* Scaling factor for filter heuristic weighting calculations */
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#define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT))
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#define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT))
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/* Flags for the png_ptr->flags rather than declaring a byte for each one */
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#define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001
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#define PNG_FLAG_ZLIB_CUSTOM_LEVEL 0x0002
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#define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL 0x0004
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#define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS 0x0008
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#define PNG_FLAG_ZLIB_CUSTOM_METHOD 0x0010
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#define PNG_FLAG_ZLIB_FINISHED 0x0020
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#define PNG_FLAG_ROW_INIT 0x0040
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#define PNG_FLAG_FILLER_AFTER 0x0080
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#define PNG_FLAG_CRC_ANCILLARY_USE 0x0100
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#define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200
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#define PNG_FLAG_CRC_CRITICAL_USE 0x0400
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#define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800
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/* 0x1000 unused */
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/* 0x2000 unused */
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/* 0x4000 unused */
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#define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000L
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#define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000L
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#define PNG_FLAG_LIBRARY_MISMATCH 0x20000L
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#define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000L
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#define PNG_FLAG_STRIP_ERROR_TEXT 0x80000L
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#define PNG_FLAG_MALLOC_NULL_MEM_OK 0x100000L
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#define PNG_FLAG_ADD_ALPHA 0x200000L /* Added to libpng-1.2.8 */
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#define PNG_FLAG_STRIP_ALPHA 0x400000L /* Added to libpng-1.2.8 */
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#define PNG_FLAG_BENIGN_ERRORS_WARN 0x800000L /* Added to libpng-1.4.0 */
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/* 0x1000000L unused */
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/* 0x2000000L unused */
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/* 0x4000000L unused */
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/* 0x8000000L unused */
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/* 0x10000000L unused */
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/* 0x20000000L unused */
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/* 0x40000000L unused */
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#define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \
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PNG_FLAG_CRC_ANCILLARY_NOWARN)
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#define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \
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PNG_FLAG_CRC_CRITICAL_IGNORE)
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#define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \
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PNG_FLAG_CRC_CRITICAL_MASK)
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/* zlib.h declares a magic type 'uInt' that limits the amount of data that zlib
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* can handle at once. This type need be no larger than 16 bits (so maximum of
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* 65535), this define allows us to discover how big it is, but limited by the
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* maximuum for png_size_t. The value can be overriden in a library build
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* (pngusr.h, or set it in CPPFLAGS) and it works to set it to a considerably
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* lower value (e.g. 255 works). A lower value may help memory usage (slightly)
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* and may even improve performance on some systems (and degrade it on others.)
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*/
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#ifndef ZLIB_IO_MAX
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# define ZLIB_IO_MAX ((uInt)-1)
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#endif
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/* Save typing and make code easier to understand */
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#define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \
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abs((int)((c1).green) - (int)((c2).green)) + \
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abs((int)((c1).blue) - (int)((c2).blue)))
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/* Added to libpng-1.2.6 JB */
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#define PNG_ROWBYTES(pixel_bits, width) \
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((pixel_bits) >= 8 ? \
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((png_size_t)(width) * (((png_size_t)(pixel_bits)) >> 3)) : \
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(( ((png_size_t)(width) * ((png_size_t)(pixel_bits))) + 7) >> 3) )
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/* PNG_OUT_OF_RANGE returns true if value is outside the range
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* ideal-delta..ideal+delta. Each argument is evaluated twice.
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* "ideal" and "delta" should be constants, normally simple
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* integers, "value" a variable. Added to libpng-1.2.6 JB
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*/
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#define PNG_OUT_OF_RANGE(value, ideal, delta) \
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( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) )
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/* Conversions between fixed and floating point, only defined if
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* required (to make sure the code doesn't accidentally use float
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* when it is supposedly disabled.)
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*/
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#ifdef PNG_FLOATING_POINT_SUPPORTED
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/* The floating point conversion can't overflow, though it can and
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* does lose accuracy relative to the original fixed point value.
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* In practice this doesn't matter because png_fixed_point only
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* stores numbers with very low precision. The png_ptr and s
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* arguments are unused by default but are there in case error
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* checking becomes a requirement.
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*/
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#define png_float(png_ptr, fixed, s) (.00001 * (fixed))
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/* The fixed point conversion performs range checking and evaluates
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* its argument multiple times, so must be used with care. The
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* range checking uses the PNG specification values for a signed
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* 32 bit fixed point value except that the values are deliberately
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* rounded-to-zero to an integral value - 21474 (21474.83 is roughly
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* (2^31-1) * 100000). 's' is a string that describes the value being
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* converted.
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*
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* NOTE: this macro will raise a png_error if the range check fails,
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* therefore it is normally only appropriate to use this on values
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* that come from API calls or other sources where an out of range
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* error indicates a programming error, not a data error!
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*
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* NOTE: by default this is off - the macro is not used - because the
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* function call saves a lot of code.
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*/
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#ifdef PNG_FIXED_POINT_MACRO_SUPPORTED
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#define png_fixed(png_ptr, fp, s) ((fp) <= 21474 && (fp) >= -21474 ?\
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((png_fixed_point)(100000 * (fp))) : (png_fixed_error(png_ptr, s),0))
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#else
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PNG_EXTERN png_fixed_point png_fixed PNGARG((png_structp png_ptr, double fp,
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png_const_charp text));
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#endif
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#endif
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/* Constant strings for known chunk types. If you need to add a chunk,
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* define the name here, and add an invocation of the macro wherever it's
|
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* needed.
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*/
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#define PNG_IHDR PNG_CONST png_byte png_IHDR[5] = { 73, 72, 68, 82, '\0'}
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#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 */
|