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Add Alpha Encode support from WebPEncode.

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Extend WebP Encode functionality to encode Alpha data and produce
bit-stream (RIFF+VP8X+ALPH+VP8) corresponding to WebP-Alpha.

Change-Id: I983b4cd97be94a86a8e6d03b3b9c728db851bf48
This commit is contained in:
Vikas Arora
2011-12-01 12:14:15 +05:30
parent 16612ddd30
commit 9523f2a5de
9 changed files with 207 additions and 138 deletions
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3
src/enc/vp8enci.h
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@ -333,7 +333,7 @@ struct VP8Encoder {
// transparency blob
int has_alpha_;
uint8_t* alpha_data_; // non-NULL if transparency is present
size_t alpha_data_size_;
uint32_t alpha_data_size_;
// enhancement layer
int use_layer_;
@ -436,7 +436,6 @@ int VP8Decimate(VP8EncIterator* const it, VP8ModeScore* const rd, int rd_opt);
// in alpha.c
void VP8EncInitAlpha(VP8Encoder* enc); // initialize alpha compression
void VP8EncCodeAlphaBlock(VP8EncIterator* it); // analyze or code a macroblock
int VP8EncFinishAlpha(VP8Encoder* enc); // finalize compressed data
void VP8EncDeleteAlpha(VP8Encoder* enc); // delete compressed data