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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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6
src/webp/encode.h
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@ -71,7 +71,11 @@ typedef struct {
// Default is set to 0 for easier progressive decoding.
int partition_limit; // quality degradation allowed to fit the 512k limit on
// prediction modes coding (0=no degradation, 100=full)
int alpha_compression; // Algorithm for optimizing the alpha plane (0 = none)
int alpha_compression; // Algorithm for encoding the alpha plane (0 = none,
// 1 = Backward reference counts encoded with
// Arithmetic encoder). Default is 1.
int alpha_quality; // Between 0 (smallest size) and 100 (lossless).
// Default is 100.
} WebPConfig;
// Enumerate some predefined settings for WebPConfig, depending on the type