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Rectify WebPMuxGetFeatures:

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It should return ALPHA_FLAG for lossless bit-stream

Change-Id: I900bd5b58bf75bc25fca1abf4ecc12aea26eac1c
This commit is contained in:
Urvang Joshi
2012-11-09 14:37:20 -08:00
parent 7caab1d8f6
commit 2ca642e02a
2 changed files with 24 additions and 17 deletions
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12
src/mux/muxinternal.c
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@ -578,12 +578,14 @@ WebPMuxError MuxValidate(const WebPMux* const mux) {
if (num_vp8x == 0 && num_images != 1) return WEBP_MUX_INVALID_ARGUMENT;
// ALPHA_FLAG & alpha chunk(s) are consistent.
if (num_vp8x > 0 && MuxHasLosslessImages(mux->images_)) {
// Special case: we have a VP8X chunk as well as some lossless images.
if (!(flags & ALPHA_FLAG)) return WEBP_MUX_INVALID_ARGUMENT;
if (MuxHasLosslessImages(mux->images_)) {
if (num_vp8x > 0) {
// Special case: we have a VP8X chunk as well as some lossless images.
if (!(flags & ALPHA_FLAG)) return WEBP_MUX_INVALID_ARGUMENT;
}
} else {
err = ValidateChunk(mux, IDX_ALPHA, ALPHA_FLAG, flags, -1, &num_alpha);
if (err != WEBP_MUX_OK) return err;
err = ValidateChunk(mux, IDX_ALPHA, ALPHA_FLAG, flags, -1, &num_alpha);
if (err != WEBP_MUX_OK) return err;
}
// num_fragments & num_images are consistent.