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Improved alpha cleanup for the webp encoder when prediction transform is used.

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Gives 0.9% smaller (2.4% compared to before alpha cleanup) size on the 1000 PNGs dataset:
Alpha cleanup before: 18856614
Alpha cleanup after: 18685802
For reference, with no alpha cleanup: 19159992

Note: WebPCleanupTransparentArea is still also called in WebPEncode. This cleanup still helps
preprocessing in the encoder, and the cases when the prediction transform is not used.

Change-Id: I63e69f48af6ddeb9804e2e603c59dde2718c6c28
This commit is contained in:
Lode Vandevenne
2015-12-04 14:37:49 +01:00
committed by Pascal Massimino
parent 2c08aac81a
commit 6938111357
4 changed files with 34 additions and 11 deletions
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src/dsp/lossless.h
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@ -161,7 +161,7 @@ void VP8LCollectColorBlueTransforms_C(const uint32_t* argb, int stride,
void VP8LResidualImage(int width, int height, int bits, int low_effort,
uint32_t* const argb, uint32_t* const argb_scratch,
uint32_t* const image);
uint32_t* const image, int exact);
void VP8LColorSpaceTransform(int width, int height, int bits, int quality,
uint32_t* const argb, uint32_t* image);