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Imported from libpng-0.87.tar

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This commit is contained in:
Guy Schalnat
1996-01-16 01:51:56 -06:00
committed by Glenn Randers-Pehrson
parent 69b1448f19
commit 4ee97b0891
22 changed files with 1210 additions and 863 deletions
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31
pngwtran.c
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@@ -1,10 +1,10 @@
/* pngwtran.c - transforms the data in a row for png writers
libpng 1.0 beta 2 - version 0.86
libpng 1.0 beta 2 - version 0.87
For conditions of distribution and use, see copyright notice in png.h
Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
January 10, 1996
January 15, 1996
*/
#define PNG_INTERNAL
@@ -78,13 +78,13 @@ png_do_pack(png_row_infop row_info, png_bytep row, png_byte bit_depth)
else
{
mask = 0x80;
*dp = v;
*dp = (png_byte)v;
dp++;
v = 0;
}
}
if (mask != 0x80)
*dp = v;
*dp = (png_byte)v;
break;
}
case 2:
@@ -94,7 +94,7 @@ png_do_pack(png_row_infop row_info, png_bytep row, png_byte bit_depth)
int shift;
png_int_32 i;
int v;
png_byte value;
png_byte value;
sp = row;
dp = row;
@@ -102,12 +102,12 @@ png_do_pack(png_row_infop row_info, png_bytep row, png_byte bit_depth)
v = 0;
for (i = 0; i < row_info->width; i++)
{
value = *sp & 0x3;
value = (png_byte)(*sp & 0x3);
v |= (value << shift);
if (shift == 0)
{
shift = 6;
*dp = v;
*dp = (png_byte)v;
dp++;
v = 0;
}
@@ -116,7 +116,7 @@ png_do_pack(png_row_infop row_info, png_bytep row, png_byte bit_depth)
sp++;
}
if (shift != 6)
*dp = v;
*dp = (png_byte)v;
break;
}
case 4:
@@ -134,13 +134,13 @@ png_do_pack(png_row_infop row_info, png_bytep row, png_byte bit_depth)
v = 0;
for (i = 0; i < row_info->width; i++)
{
value = *sp & 0xf;
value = (png_byte)(*sp & 0xf);
v |= (value << shift);
if (shift == 0)
{
shift = 4;
*dp = v;
*dp = (png_byte)v;
dp++;
v = 0;
}
@@ -150,12 +150,12 @@ png_do_pack(png_row_infop row_info, png_bytep row, png_byte bit_depth)
sp++;
}
if (shift != 4)
*dp = v;
*dp = (png_byte)v;
break;
}
}
row_info->bit_depth = bit_depth;
row_info->pixel_depth = bit_depth * row_info->channels;
row_info->pixel_depth = (png_uint_16)(bit_depth * row_info->channels);
row_info->rowbytes =
((row_info->width * row_info->pixel_depth + 7) >> 3);
}
@@ -276,7 +276,8 @@ png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth)
{
png_uint_16 value, v;
v = ((png_uint_16)(*bp) << 8) + (png_uint_16)(*(bp + 1));
v = (png_uint_16)(((png_uint_16)(*bp) << 8) +
(png_uint_16)(*(bp + 1)));
value = 0;
for (j = shift_start[c]; j > -shift_dec[c]; j -= shift_dec[c])
{
@@ -285,8 +286,8 @@ png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth)
else
value |= (png_uint_16)((v >> (-j)) & (png_uint_16)0xffff);
}
*bp = value >> 8;
*(bp + 1) = value & 0xff;
*bp = (png_byte)(value >> 8);
*(bp + 1) = (png_byte)(value & 0xff);
}
}
}