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[devel] Make the 16-to-8 scaling accurate. Dividing by 256 with no rounding is

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wrong (high by one) 25% of the time. Dividing by 257 with rounding is
    wrong in 128 out of 65536 cases. Getting the right answer all the time
    without division is easy.
This commit is contained in:
John Bowler
2011-06-10 23:24:58 -05:00
committed by Glenn Randers-Pehrson
parent cc2770850a
commit b2bee3374c
12 changed files with 81 additions and 55 deletions
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4
png.h
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@@ -1659,7 +1659,7 @@ PNG_EXPORT(73, void, png_set_compression_method, (png_structp png_ptr,
int method));
#endif
#ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION
#ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED
/* Also set zlib parameters for compressing non-IDAT chunks */
PNG_EXPORT(222, void, png_set_text_compression_level,
(png_structp png_ptr, int level));
@@ -1678,7 +1678,7 @@ PNG_EXPORT(225, void, png_set_text_compression_window_bits, (png_structp
PNG_EXPORT(226, void, png_set_text_compression_method, (png_structp png_ptr,
int method));
#endif /* PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION */
#endif /* PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED */
/* These next functions are called for input/output, memory, and error
* handling. They are in the file pngrio.c, pngwio.c, and pngerror.c,