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Regression fix for alpha channels using color cache:

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Considering the fact that insert to/lookup from the color cache is always 32
bit, use DecodeImageData() variant in that case.

Change-Id: I6c665a6cfbd9bd10651c1e82fa54e687cbd54a2b
This commit is contained in:
Urvang Joshi 2013-06-17 03:45:09 -07:00
parent 241cf99bc0
commit a37eff47d6
1 changed files with 5 additions and 4 deletions
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9
src/dec/vp8l.c
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@ -1157,11 +1157,12 @@ int VP8LDecodeAlphaHeader(ALPHDecoder* const alph_dec,
goto Err;
}
// Special case: if alpha data contains only the color indexing transform
// (a frequent case), we will use DecodeAlphaData() method that only needs
// allocation of 1 byte per pixel (alpha channel).
// Special case: if alpha data uses only the color indexing transform and
// doesn't use color cache (a frequent case), we will use DecodeAlphaData()
// method that only needs allocation of 1 byte per pixel (alpha channel).
if (dec->next_transform_ == 1 &&
dec->transforms_[0].type_ == COLOR_INDEXING_TRANSFORM) {
dec->transforms_[0].type_ == COLOR_INDEXING_TRANSFORM &&
dec->hdr_.color_cache_size_ == 0) {
alph_dec->bytes_per_pixel_ = sizeof(uint8_t);
}