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gif2webp: Improved compression for lossy animated WebP

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We reduce transparency by turning some transparent pixels into
corresponding RGB values from previous canvas.

This improves compression by about 23%.

Change-Id: I02d70a43a1d0906ac09a7e2dc510be3b2d38f593
This commit is contained in:
Urvang Joshi
2013-09-30 16:48:39 -07:00
parent fb887f7fe6
commit 606c4304c4
3 changed files with 29 additions and 0 deletions
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5
examples/gif2webp_util.h
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@ -86,6 +86,11 @@ void WebPUtilBlendPixels(const struct WebPPicture* const src,
const WebPFrameRect* const src_rect,
struct WebPPicture* const dst);
// Replace transparent pixels within 'dst_rect' of 'dst' by those in the 'src'.
void WebPUtilReduceTransparency(const struct WebPPicture* const src,
const WebPFrameRect* const dst_rect,
struct WebPPicture* const dst);
//------------------------------------------------------------------------------
// Key frame related.