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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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9
src/mux/muxi.h
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@ -257,19 +257,22 @@ size_t MuxImageListDiskSize(const WebPMuxImage* wpi_list);
// Write out the given list of images into 'dst'.
uint8_t* MuxImageListEmit(const WebPMuxImage* wpi_list, uint8_t* dst);
// Checks if the given image list contains at least one lossless image.
int MuxHasLosslessImages(const WebPMuxImage* images);
//------------------------------------------------------------------------------
// Helper methods for mux.
// Returns the list where chunk with given ID is to be inserted in mux.
// Return value is NULL if this chunk should be inserted in mux->images_ list
// or if 'id' is not known.
WebPChunk** GetChunkListFromId(const WebPMux* mux, TAG_ID id);
WebPChunk** MuxGetChunkListFromId(const WebPMux* mux, TAG_ID id);
// Validates that the given mux has a single image.
WebPMuxError ValidateForImage(const WebPMux* const mux);
WebPMuxError MuxValidateForImage(const WebPMux* const mux);
// Validates the given mux object.
WebPMuxError WebPMuxValidate(const WebPMux* const mux);
WebPMuxError MuxValidate(const WebPMux* const mux);
//------------------------------------------------------------------------------