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gif2webp: detect and flatten uniformly similar blocks

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helps during lossless compression.

10% average saving, but that's mostly on what was previously
'difficult' cases, where the gain is ~30-50% actually.
Non-difficult cases are mostly unchanged.
Tested over ~7k random web gifs.

Change-Id: I09db4560e4ab09105d1cad28e6dbf83842eda8e9
This commit is contained in:
skal
2013-10-08 15:04:52 +02:00
parent 6a8c0eb718
commit 00125196f3
3 changed files with 59 additions and 2 deletions
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6
examples/gif2webp_util.h
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@ -91,6 +91,12 @@ void WebPUtilReduceTransparency(const struct WebPPicture* const src,
const WebPFrameRect* const dst_rect,
struct WebPPicture* const dst);
// Replace similar blocks of pixels by a 'see-through' transparent block
// with uniform average color.
void WebPUtilFlattenSimilarBlocks(const WebPPicture* const src,
const WebPFrameRect* const rect,
WebPPicture* const dst);
//------------------------------------------------------------------------------
// Key frame related.