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Imported from libpng-0.98.tar

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This commit is contained in:
Glenn Randers-Pehrson
1998-01-16 22:06:18 -06:00
parent 2687fcc7b5
commit c4a2ae6cac
26 changed files with 687 additions and 240 deletions
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13
pngwutil.c
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@@ -1,12 +1,12 @@
/* pngwutil.c - utilities to write a PNG file
*
* libpng 0.97
* libpng 0.98
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, Glenn Randers-Pehrson
* January 7, 1998
* January 16, 1998
*/
#define PNG_INTERNAL
@@ -346,7 +346,7 @@ png_write_gAMA(png_structp png_ptr, double file_gamma)
#if defined(PNG_WRITE_sRGB_SUPPORTED)
/* write a sRGB chunk */
void
png_write_sRGB(png_structp png_ptr, png_byte srgb_intent)
png_write_sRGB(png_structp png_ptr, int srgb_intent)
{
png_byte buf[1];
@@ -354,7 +354,7 @@ png_write_sRGB(png_structp png_ptr, png_byte srgb_intent)
if(srgb_intent > 3)
png_warning(png_ptr,
"Invalid sRGB rendering intent specified");
buf[0]=srgb_intent;
buf[0]=(png_byte)srgb_intent;
png_write_chunk(png_ptr, png_sRGB, buf, (png_size_t)1);
}
#endif
@@ -506,7 +506,7 @@ png_write_tRNS(png_structp png_ptr, png_bytep trans, png_color_16p tran,
}
else
{
png_warning(png_ptr, "Can't write tRNS with and alpha channel");
png_warning(png_ptr, "Can't write tRNS with an alpha channel");
}
}
#endif
@@ -992,6 +992,7 @@ png_write_pCAL(png_structp png_ptr, png_charp purpose, png_int_32 X0,
(png_size_t)params_len[i]);
}
png_free(png_ptr, params_len);
png_write_chunk_end(png_ptr);
}
#endif
@@ -1395,7 +1396,7 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
* smallest value when summing the absolute values of the distances
* from zero using anything >= 128 as negative numbers. This is known
* as the "minimum sum of absolute differences" heuristic. Other
* heruistics are the "weighted minumum sum of absolute differences"
* heuristics are the "weighted minumum sum of absolute differences"
* (experimental and can in theory improve compression), and the "zlib
* predictive" method (not implemented in libpng 0.95), which does test
* compressions of lines using different filter methods, and then chooses