forked from KolibriOS/kolibrios
611 lines
15 KiB
NASM
611 lines
15 KiB
NASM
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; pngwtran.asm - transforms the data in a row for PNG writers
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; Last changed in libpng 1.6.24 [August 4, 2016]
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; Copyright (c) 1998-2002,2004,2006-2016 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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; 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.inc
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; Pack pixels into bytes. Pass the true bit depth in bit_depth. The
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; row_info bit depth should be 8 (one pixel per byte). The channels
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; should be 1 (this only happens on grayscale and paletted images).
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;void (png_row_infop row_info, bytep row, uint_32 bit_depth)
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align 4
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proc png_do_pack, row_info:dword, row:dword, bit_depth:dword
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png_debug 1, 'in png_do_pack'
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; if (row_info->bit_depth == 8 &&
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; row_info->channels == 1)
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; {
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; switch ((int)bit_depth)
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; {
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; case 1:
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; {
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; bytep sp, dp;
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; int mask, v;
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; uint_32 i;
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; uint_32 row_width = row_info->width;
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; sp = row;
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; dp = row;
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; mask = 0x80;
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; v = 0;
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; for (i = 0; i < row_width; i++)
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; {
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; if (*sp != 0)
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; v |= mask;
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; sp++;
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; if (mask > 1)
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; mask >>= 1;
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; else
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; {
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; mask = 0x80;
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; *dp = (byte)v;
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; dp++;
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; v = 0;
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; }
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; }
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; if (mask != 0x80)
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; *dp = (byte)v;
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; break;
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; }
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; case 2:
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; {
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; bytep sp, dp;
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; unsigned int shift;
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; int v;
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; uint_32 i;
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; uint_32 row_width = row_info->width;
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; sp = row;
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; dp = row;
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; shift = 6;
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; v = 0;
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; for (i = 0; i < row_width; i++)
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; {
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; byte value;
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; value = (byte)(*sp & 0x03);
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; v |= (value << shift);
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; if (shift == 0)
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; {
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; shift = 6;
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; *dp = (byte)v;
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; dp++;
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; v = 0;
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; }
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; else
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; shift -= 2;
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;
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; sp++;
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; }
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; if (shift != 6)
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; *dp = (byte)v;
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; break;
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; }
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; case 4:
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; {
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; bytep sp, dp;
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; unsigned int shift;
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; int v;
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; uint_32 i;
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; uint_32 row_width = row_info->width;
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; sp = row;
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; dp = row;
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; shift = 4;
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; v = 0;
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; for (i = 0; i < row_width; i++)
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; {
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; byte value;
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; value = (byte)(*sp & 0x0f);
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; v |= (value << shift);
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; if (shift == 0)
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; {
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; shift = 4;
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; *dp = (byte)v;
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; dp++;
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; v = 0;
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; }
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; else
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; shift -= 4;
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;
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; sp++;
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; }
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; if (shift != 4)
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; *dp = (byte)v;
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; break;
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; }
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; default:
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; break;
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; }
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; row_info->bit_depth = (byte)bit_depth;
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; row_info->pixel_depth = (byte)(bit_depth * row_info->channels);
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; row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth,
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; row_info->width);
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; }
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ret
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endp
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; Shift pixel values to take advantage of whole range. Pass the
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; true number of bits in bit_depth. The row should be packed
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; according to row_info->bit_depth. Thus, if you had a row of
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; bit depth 4, but the pixels only had values from 0 to 7, you
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; would pass 3 as bit_depth, and this routine would translate the
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; data to 0 to 15.
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;void (png_row_infop row_info, bytep row, png_const_color_8p bit_depth)
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align 4
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proc png_do_shift, row_info:dword, row:dword, bit_depth:dword
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png_debug 1, 'in png_do_shift'
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; if (row_info->color_type != PNG_COLOR_TYPE_PALETTE)
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; {
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; int shift_start[4], shift_dec[4];
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; int channels = 0;
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; if ((row_info->color_type & PNG_COLOR_MASK_COLOR) != 0)
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; {
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; shift_start[channels] = row_info->bit_depth - bit_depth->red;
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; shift_dec[channels] = bit_depth->red;
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; channels++;
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; shift_start[channels] = row_info->bit_depth - bit_depth->green;
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; shift_dec[channels] = bit_depth->green;
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; channels++;
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; shift_start[channels] = row_info->bit_depth - bit_depth->blue;
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; shift_dec[channels] = bit_depth->blue;
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; channels++;
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; }
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; else
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; {
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; shift_start[channels] = row_info->bit_depth - bit_depth->gray;
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; shift_dec[channels] = bit_depth->gray;
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; channels++;
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; }
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; if ((row_info->color_type & PNG_COLOR_MASK_ALPHA) != 0)
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; {
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; shift_start[channels] = row_info->bit_depth - bit_depth->alpha;
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; shift_dec[channels] = bit_depth->alpha;
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; channels++;
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; }
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; With low row depths, could only be grayscale, so one channel
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; if (row_info->bit_depth < 8)
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; {
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; bytep bp = row;
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; png_size_t i;
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; unsigned int mask;
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; png_size_t row_bytes = row_info->rowbytes;
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; if (bit_depth->gray == 1 && row_info->bit_depth == 2)
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; mask = 0x55;
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; else if (row_info->bit_depth == 4 && bit_depth->gray == 3)
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; mask = 0x11;
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; else
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; mask = 0xff;
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; for (i = 0; i < row_bytes; i++, bp++)
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; {
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; int j;
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; unsigned int v, out;
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; v = *bp;
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; out = 0;
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; for (j = shift_start[0]; j > -shift_dec[0]; j -= shift_dec[0])
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; {
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; if (j > 0)
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; out |= v << j;
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; else
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; out |= (v >> (-j)) & mask;
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; }
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; *bp = (byte)(out & 0xff);
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; }
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; }
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; else if (row_info->bit_depth == 8)
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; {
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; bytep bp = row;
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; uint_32 i;
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; uint_32 istop = channels * row_info->width;
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; for (i = 0; i < istop; i++, bp++)
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; {
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; const unsigned int c = i%channels;
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; int j;
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; unsigned int v, out;
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; v = *bp;
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; out = 0;
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; for (j = shift_start[c]; j > -shift_dec[c]; j -= shift_dec[c])
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; {
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; if (j > 0)
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; out |= v << j;
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; else
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; out |= v >> (-j);
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; }
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; *bp = (byte)(out & 0xff);
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; }
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; }
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; else
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; {
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; bytep bp;
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; uint_32 i;
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; uint_32 istop = channels * row_info->width;
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; for (bp = row, i = 0; i < istop; i++)
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; {
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; const unsigned int c = i%channels;
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; int j;
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; unsigned int value, v;
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; v = png_get_uint_16(bp);
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; value = 0;
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; for (j = shift_start[c]; j > -shift_dec[c]; j -= shift_dec[c])
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; {
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; if (j > 0)
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; value |= v << j;
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; else
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; value |= v >> (-j);
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; }
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; *bp++ = (byte)((value >> 8) & 0xff);
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; *bp++ = (byte)(value & 0xff);
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; }
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; }
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; }
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ret
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endp
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;void (png_row_infop row_info, bytep row)
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align 4
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proc png_do_write_swap_alpha, row_info:dword, row:dword
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png_debug 1, 'in png_do_write_swap_alpha'
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; {
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; if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
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; {
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; if (row_info->bit_depth == 8)
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; {
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; This converts from ARGB to RGBA
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; bytep sp, dp;
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; uint_32 i;
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; uint_32 row_width = row_info->width;
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; for (i = 0, sp = dp = row; i < row_width; i++)
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; {
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; byte save = *(sp++);
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; *(dp++) = *(sp++);
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; *(dp++) = *(sp++);
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; *(dp++) = *(sp++);
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; *(dp++) = save;
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; }
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; }
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if PNG_WRITE_16BIT_SUPPORTED eq 1
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; else
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; {
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; This converts from AARRGGBB to RRGGBBAA
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; bytep sp, dp;
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; uint_32 i;
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; uint_32 row_width = row_info->width;
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;
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; for (i = 0, sp = dp = row; i < row_width; i++)
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; {
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; byte save[2];
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; save[0] = *(sp++);
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; save[1] = *(sp++);
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; *(dp++) = *(sp++);
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; *(dp++) = *(sp++);
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; *(dp++) = *(sp++);
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; *(dp++) = *(sp++);
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; *(dp++) = *(sp++);
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; *(dp++) = *(sp++);
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; *(dp++) = save[0];
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; *(dp++) = save[1];
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; }
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; }
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end if ;WRITE_16BIT
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; }
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;
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; else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
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; {
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; if (row_info->bit_depth == 8)
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; {
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; This converts from AG to GA
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; bytep sp, dp;
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; uint_32 i;
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; uint_32 row_width = row_info->width;
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; for (i = 0, sp = dp = row; i < row_width; i++)
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; {
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; byte save = *(sp++);
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; *(dp++) = *(sp++);
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; *(dp++) = save;
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; }
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; }
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if PNG_WRITE_16BIT_SUPPORTED eq 1
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; else
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; {
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; This converts from AAGG to GGAA
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; bytep sp, dp;
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; uint_32 i;
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; uint_32 row_width = row_info->width;
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; for (i = 0, sp = dp = row; i < row_width; i++)
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; {
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; byte save[2];
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; save[0] = *(sp++);
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; save[1] = *(sp++);
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; *(dp++) = *(sp++);
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; *(dp++) = *(sp++);
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; *(dp++) = save[0];
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; *(dp++) = save[1];
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; }
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; }
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end if ;WRITE_16BIT
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; }
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; }
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ret
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endp
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;void (png_row_infop row_info, bytep row)
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align 4
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proc png_do_write_invert_alpha, row_info:dword, row:dword
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png_debug 1, 'in png_do_write_invert_alpha'
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; if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
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; {
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; if (row_info->bit_depth == 8)
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; {
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; This inverts the alpha channel in RGBA
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; bytep sp, dp;
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; uint_32 i;
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; uint_32 row_width = row_info->width;
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; for (i = 0, sp = dp = row; i < row_width; i++)
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; {
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; Does nothing
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;*(dp++) = *(sp++);
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;*(dp++) = *(sp++);
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;*(dp++) = *(sp++);
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; sp+=3; dp = sp;
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; *dp = (byte)(255 - *(sp++));
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; }
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; }
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;if PNG_WRITE_16BIT_SUPPORTED
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; else
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; {
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; This inverts the alpha channel in RRGGBBAA
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; bytep sp, dp;
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; uint_32 i;
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; uint_32 row_width = row_info->width;
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; for (i = 0, sp = dp = row; i < row_width; i++)
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; {
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; Does nothing
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;*(dp++) = *(sp++);
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;*(dp++) = *(sp++);
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;*(dp++) = *(sp++);
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;*(dp++) = *(sp++);
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;*(dp++) = *(sp++);
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;*(dp++) = *(sp++);
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; sp+=6; dp = sp;
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; *(dp++) = (byte)(255 - *(sp++));
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; *dp = (byte)(255 - *(sp++));
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; }
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; }
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;end if /* WRITE_16BIT */
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; }
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; else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
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; {
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; if (row_info->bit_depth == 8)
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; {
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; This inverts the alpha channel in GA
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; bytep sp, dp;
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; uint_32 i;
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; uint_32 row_width = row_info->width;
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;
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; for (i = 0, sp = dp = row; i < row_width; i++)
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; {
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; *(dp++) = *(sp++);
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; *(dp++) = (byte)(255 - *(sp++));
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; }
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; }
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if PNG_WRITE_16BIT_SUPPORTED eq 1
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; else
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; {
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; This inverts the alpha channel in GGAA
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; bytep sp, dp;
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; uint_32 i;
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; uint_32 row_width = row_info->width;
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;
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; for (i = 0, sp = dp = row; i < row_width; i++)
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; {
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; Does nothing
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;*(dp++) = *(sp++);
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;*(dp++) = *(sp++);
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; sp+=2; dp = sp;
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; *(dp++) = (byte)(255 - *(sp++));
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; *dp = (byte)(255 - *(sp++));
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; }
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; }
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end if ;WRITE_16BIT
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; }
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ret
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endp
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; Transform the data according to the user's wishes. The order of
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; transformations is significant.
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;void (png_structrp png_ptr, png_row_infop row_info)
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align 4
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proc png_do_write_transformations uses eax ebx edi esi, png_ptr:dword, row_info:dword
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png_debug 1, 'in png_do_write_transformations'
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mov edi,[png_ptr]
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cmp edi,0
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je .end_f ;if (..==0) return
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mov esi,[row_info]
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mov ebx,[edi+png_struct.row_buf]
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inc ebx ;start of pixel data for row
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if PNG_WRITE_USER_TRANSFORM_SUPPORTED eq 1
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mov eax,[edi+png_struct.transformations]
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and eax,PNG_USER_TRANSFORM
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cmp eax,0
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je @f ;if (..!=0)
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mov eax,[edi+png_struct.write_user_transform_fn]
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cmp eax,0
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je @f ;if (..!=0)
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stdcall eax, edi, esi, ebx ;User write transform function
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; row_info:
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; uint_32 width ;width of row
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; png_size_t rowbytes ;number of bytes in row
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; byte color_type ;color type of pixels
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; byte bit_depth ;bit depth of samples
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; byte channels ;number of channels (1-4)
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; byte pixel_depth ;bits per pixel (depth*channels)
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@@:
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end if
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if PNG_WRITE_FILLER_SUPPORTED eq 1
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mov eax,[edi+png_struct.transformations]
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and eax,PNG_FILLER
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cmp eax,0
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je @f ;if (..!=0)
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mov eax,[edi+png_struct.flags]
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and eax,PNG_FLAG_FILLER_AFTER
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not eax
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stdcall png_do_strip_channel, esi, ebx, eax
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@@:
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end if
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if PNG_WRITE_PACKSWAP_SUPPORTED eq 1
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mov eax,[edi+png_struct.transformations]
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and eax,PNG_PACKSWAP
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cmp eax,0
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je @f ;if (..!=0)
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stdcall png_do_packswap, esi, ebx
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@@:
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end if
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if PNG_WRITE_PACK_SUPPORTED eq 1
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mov eax,[edi+png_struct.transformations]
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and eax,PNG_PACK
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cmp eax,0
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je @f ;if (..!=0)
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movzx eax,byte[edi+png_struct.bit_depth]
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stdcall png_do_pack, esi, ebx, eax
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@@:
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end if
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if PNG_WRITE_SWAP_SUPPORTED eq 1
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if PNG_16BIT_SUPPORTED eq 1
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mov eax,[edi+png_struct.transformations]
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and eax,PNG_SWAP_BYTES
|
|
cmp eax,0
|
|
je @f ;if (..!=0)
|
|
stdcall png_do_swap, esi, ebx
|
|
@@:
|
|
end if
|
|
end if
|
|
|
|
if PNG_WRITE_SHIFT_SUPPORTED eq 1
|
|
mov eax,[edi+png_struct.transformations]
|
|
and eax,PNG_SHIFT
|
|
cmp eax,0
|
|
je @f ;if (..!=0)
|
|
mov eax,edi
|
|
add eax,png_struct.shift
|
|
stdcall png_do_shift, esi, ebx, eax
|
|
@@:
|
|
end if
|
|
|
|
if PNG_WRITE_SWAP_ALPHA_SUPPORTED eq 1
|
|
mov eax,[edi+png_struct.transformations]
|
|
and eax,PNG_SWAP_ALPHA
|
|
cmp eax,0
|
|
je @f ;if (..!=0)
|
|
stdcall png_do_write_swap_alpha, esi, ebx
|
|
@@:
|
|
end if
|
|
|
|
if PNG_WRITE_INVERT_ALPHA_SUPPORTED eq 1
|
|
mov eax,[edi+png_struct.transformations]
|
|
and eax,PNG_INVERT_ALPHA
|
|
cmp eax,0
|
|
je @f ;if (..!=0)
|
|
stdcall png_do_write_invert_alpha, esi, ebx
|
|
@@:
|
|
end if
|
|
|
|
if PNG_WRITE_BGR_SUPPORTED eq 1
|
|
mov eax,[edi+png_struct.transformations]
|
|
and eax,PNG_BGR
|
|
cmp eax,0
|
|
je @f ;if (..!=0)
|
|
stdcall png_do_bgr, esi, ebx
|
|
@@:
|
|
end if
|
|
|
|
if PNG_WRITE_INVERT_SUPPORTED eq 1
|
|
mov eax,[edi+png_struct.transformations]
|
|
and eax,PNG_INVERT_MONO
|
|
cmp eax,0
|
|
je @f ;if (..!=0)
|
|
stdcall png_do_invert, esi, ebx
|
|
@@:
|
|
end if
|
|
.end_f:
|
|
ret
|
|
endp
|