Andrew Osmond efc0d9172c Bug 1504237 - Ensure partial animated frames always use BGRA instead of BGRX. r=tnikkel ...

For decoders which produce unpaletted partial frames (APNG, WebP), the
surface format should always be BGRA. These frames while partial, are
the same size as the output size of the animated image. When
FrameAnimator performs the blend with the compositing frame, it expects
all pixels we don't care about to be set to fully transparent. If it is
BGRX, they will be set to solid white instead.

Differential Revision: https://phabricator.services.mozilla.com/D10753

2018-11-03 19:47:54 -04:00

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