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Alpha flag fix for lossless.

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- Make sure alpha flag is set in case of a lossless file with VP8X chunk.
  The semantic of ALPHA_FLAG changes with this: it means the images
  contain alpha (rather than ALPH chunk in particular).
- Update the mux container spec to add 1-line description of alpha
  flag.
- Rename "HasLosslessImages()" to "MuxHasLosslessImages()", and other
  similar function renames.
- Rename FeatureFlags to WebPFeatureFlags
- Elaborated a comment for a special case.
- A misc comment fix.

Change-Id: If212ccf4338c125b4c71c10bf281a51b3ba7ff45
This commit is contained in:
Urvang Joshi
2012-05-23 15:01:25 +05:30
parent 98ec717f1e
commit c975c44ea5
6 changed files with 60 additions and 28 deletions
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8
src/mux/muxread.c
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@ -166,7 +166,7 @@ WebPMux* WebPMuxCreateInternal(const uint8_t* data, size_t size, int copy_data,
WebPChunk** chunk_list;
if (wpi->is_partial_) goto Err; // Encountered a non-image chunk before
// getting all chunks of an image.
chunk_list = GetChunkListFromId(mux, id); // List for adding this chunk.
chunk_list = MuxGetChunkListFromId(mux, id); // List to add this chunk.
if (chunk_list == NULL) chunk_list = &mux->unknown_;
if (ChunkSetNth(&chunk, chunk_list, 0) != WEBP_MUX_OK) goto Err;
}
@ -179,7 +179,7 @@ WebPMux* WebPMuxCreateInternal(const uint8_t* data, size_t size, int copy_data,
}
// Validate mux if complete.
if (WebPMuxValidate(mux) != WEBP_MUX_OK) goto Err;
if (MuxValidate(mux) != WEBP_MUX_OK) goto Err;
Ok:
MuxImageDelete(wpi);
@ -234,7 +234,7 @@ WebPMuxError WebPMuxGetImage(const WebPMux* const mux,
return WEBP_MUX_INVALID_ARGUMENT;
}
err = ValidateForImage(mux);
err = MuxValidateForImage(mux);
if (err != WEBP_MUX_OK) return err;
// All well. Get the image.
@ -381,7 +381,7 @@ WebPMuxError WebPMuxNumNamedElements(const WebPMux* const mux, const char* name,
if (IsWPI(id)) {
*num_elements = MuxImageCount(mux->images_, id);
} else {
WebPChunk* const* chunk_list = GetChunkListFromId(mux, id);
WebPChunk* const* chunk_list = MuxGetChunkListFromId(mux, id);
if (chunk_list == NULL) {
*num_elements = 0;
} else {