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[devel] Revised contrib/visupng, gregbook, and pngminim

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to demonstrate chop_16_to_8
This commit is contained in:
Glenn Randers-Pehrson
2011-06-16 09:08:53 -05:00
parent 5f0b9276ec
commit 850769f787
8 changed files with 27 additions and 5 deletions
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6
contrib/gregbook/readpng.c
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@@ -229,8 +229,14 @@ uch *readpng_get_image(double display_exponent, int *pChannels, ulg *pRowbytes)
png_set_expand(png_ptr);
if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))
png_set_expand(png_ptr);
#ifdef PNG_READ_16_TO_8_SUPPORTED
if (bit_depth == 16)
# ifdef PNG_READ_CHOP_16_TO_8_SUPPORTED
png_set_chop_16(png_ptr);
# else
png_set_strip_16(png_ptr);
# endif
#endif
if (color_type == PNG_COLOR_TYPE_GRAY ||
color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
png_set_gray_to_rgb(png_ptr);