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Imported from libpng-1.2.0beta5.tar

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This commit is contained in:
Glenn Randers-Pehrson
2001-08-07 22:25:59 -05:00
parent b182893c04
commit 1ea0ff34fa
55 changed files with 254 additions and 204 deletions
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38
pngtrans.c
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@@ -1,7 +1,7 @@
/* pngtrans.c - transforms the data in a row (used by both readers and writers)
*
* libpng 1.2.0beta4 - June 23, 2001
* libpng 1.2.0beta5 - August 8, 2001
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1998-2001 Glenn Randers-Pehrson
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
@@ -153,11 +153,14 @@ void /* PRIVATE */
png_do_invert(png_row_infop row_info, png_bytep row)
{
png_debug(1, "in png_do_invert\n");
if (row_info->bit_depth == 1 &&
/* This test removed from libpng version 1.0.13 and 1.2.0:
* if (row_info->bit_depth == 1 &&
*/
#if defined(PNG_USELESS_TESTS_SUPPORTED)
row != NULL && row_info != NULL &&
if (row == NULL || row_info == NULL)
return;
#endif
row_info->color_type == PNG_COLOR_TYPE_GRAY)
if (row_info->color_type == PNG_COLOR_TYPE_GRAY)
{
png_bytep rp = row;
png_uint_32 i;
@@ -169,6 +172,33 @@ png_do_invert(png_row_infop row_info, png_bytep row)
rp++;
}
}
else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA &&
row_info->bit_depth == 8)
{
png_bytep rp = row;
png_uint_32 i;
png_uint_32 istop = row_info->rowbytes;
for (i = 0; i < istop; i+=2)
{
*rp = (png_byte)(~(*rp));
rp+=2;
}
}
else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA &&
row_info->bit_depth == 16)
{
png_bytep rp = row;
png_uint_32 i;
png_uint_32 istop = row_info->rowbytes;
for (i = 0; i < istop; i+=4)
{
*rp = (png_byte)(~(*rp));
*(rp+1) = (png_byte)(~(*(rp+1)));
rp+=4;
}
}
}
#endif