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Fix PNG decoding bug

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some png with palette-based alpha channels were incorrectly
treated as alpha-less, causing segfault.

Change-Id: I03883590f9539848d5135d359b6f105d2b14329f
This commit is contained in:
Pascal Massimino 2011-09-20 07:51:02 -07:00
parent 846e93c5d1
commit 28ad70c56d
1 changed files with 3 additions and 1 deletions
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4
examples/cwebp.c
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@ -382,8 +382,10 @@ static int ReadPNG(FILE* in_file, WebPPicture* const pic, int keep_alpha) {
} }
if (png_get_valid(png, info, PNG_INFO_tRNS)) { if (png_get_valid(png, info, PNG_INFO_tRNS)) {
png_set_tRNS_to_alpha(png); png_set_tRNS_to_alpha(png);
has_alpha = 1;
} else {
has_alpha = !!(color_type & PNG_COLOR_MASK_ALPHA);
} }
has_alpha = !!(color_type & PNG_COLOR_MASK_ALPHA);
if (!keep_alpha) { if (!keep_alpha) {
png_set_strip_alpha(png); png_set_strip_alpha(png);