hui su 7ec9552c22 Make gif transparent color to be transparent black
Change it from transparent white to transparent black, which matches
the transparent color assumed in Webp dispose-to-background method.

Also pre-multiply background colors before comparison in anim_diff,
just as what is done with regular pixel values.

Change-Id: I5a790522df21619c666ce499f73e42294ed276f2
(cherry picked from commit 43bd89587987cdb37611f065210d5a260c9462fb)
2016-12-08 15:27:40 -08:00
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