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Some bug-fixes for images with alpha.

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- Fix the off-by-one diff when cropping with simple-filter.
- Fix a bug in incremental decoding in case of alpha.
- In VP8FinishRow(), do not decode alpha when y_start > y_end.
- Correct output of alpha channel for MODE_ARGB.
- Correct output of alpha channel for MODE_RGBA_4444.

Change-Id: I785763a2a704b973cc742ad93ffbb53699d1fc0a
This commit is contained in:
Urvang Joshi
2011-12-07 15:01:35 +05:30
parent 273a12a013
commit 8666a93aae
5 changed files with 84 additions and 10 deletions
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2
src/dec/frame.c
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@ -365,7 +365,7 @@ int VP8FinishRow(VP8Decoder* const dec, VP8Io* io) {
y_end = io->crop_bottom; // make sure we don't overflow on last row.
}
io->a = NULL;
if (dec->alpha_data_) {
if (dec->alpha_data_ && y_start < y_end) {
io->a = VP8DecompressAlphaRows(dec, y_start, y_end - y_start);
if (io->a == NULL) {
return VP8SetError(dec, VP8_STATUS_BITSTREAM_ERROR,