Pascal Massimino 2e3e8b2ef5 add a WebPCleanupTransparentArea() method
to 'clean up' the fully-transparent area and make it more compressible
new cwebp flags: -alpha_cleanup (off by default, since gain is not 100% guaranteed)

Change-Id: I74d77e1915eee146584cd61c9c1132a41db922eb
2012-01-18 14:01:24 -08:00
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