Nigel Tao ef5e0288ce go.image/webp: implement lossy-with-alpha. ...

This fixes all three lossy_alpha*.webp conformance tests.

The test data was generated by cwebp/dwebp version 0.4.1:
cwebp yellow_rose.png -o yellow_rose.lossy-with-alpha.webp
dwebp yellow_rose.lossy-with-alpha.webp -pgm -o tmp.pgm
convert tmp.pgm yellow_rose.lossy-with-alpha.webp.nycbcra.png

LGTM=pascal.massimino, r
R=r, pascal.massimino
CC=golang-codereviews
https://golang.org/cl/154350043

2014-10-20 10:46:12 +11:00

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