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Imported from libpng-0.88.tar

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This commit is contained in:
Guy Schalnat
1996-01-26 01:38:47 -06:00
committed by Glenn Randers-Pehrson
parent 4ee97b0891
commit b2e01bd505
36 changed files with 3932 additions and 2578 deletions
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40
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 0.87
libpng 1.0 beta 2 - version 0.88
For conditions of distribution and use, see copyright notice in png.h
Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
January 15, 1996
Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
January 25, 1996
*/
#define PNG_INTERNAL
@@ -60,8 +60,8 @@ png_do_pack(png_row_infop row_info, png_bytep row, png_byte bit_depth)
{
png_bytep sp;
png_bytep dp;
int mask;
png_int_32 i;
int mask;
png_int_32 i;
int v;
sp = row;
@@ -78,13 +78,13 @@ png_do_pack(png_row_infop row_info, png_bytep row, png_byte bit_depth)
else
{
mask = 0x80;
*dp = (png_byte)v;
dp++;
*dp = (png_byte)v;
dp++;
v = 0;
}
}
if (mask != 0x80)
*dp = (png_byte)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 = (png_byte)(*sp & 0x3);
value = (png_byte)(*sp & 0x3);
v |= (value << shift);
if (shift == 0)
{
shift = 6;
*dp = (png_byte)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 = (png_byte)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 = (png_byte)(*sp & 0xf);
value = (png_byte)(*sp & 0xf);
v |= (value << shift);
if (shift == 0)
{
shift = 4;
*dp = (png_byte)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 = (png_byte)v;
*dp = (png_byte)v;
break;
}
}
row_info->bit_depth = bit_depth;
row_info->pixel_depth = (png_uint_16)(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);
}
@@ -276,8 +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)(((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])
{
@@ -286,7 +286,7 @@ 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 = (png_byte)(value >> 8);
*bp = (png_byte)(value >> 8);
*(bp + 1) = (png_byte)(value & 0xff);
}
}
@@ -325,7 +325,7 @@ png_do_write_filler(png_row_infop row_info, png_bytep row,
}
else
{
png_bytep sp, dp;
png_bytep sp, dp;
png_uint_32 i;
for (i = 0, sp = row, dp = row;