tree b4dd37edab6952e67c7362a247014016abac37a5
parent a7eaf2e7e84ff10d1ed76b5d1e039c1a2d931392
author brianosman <brianosman@google.com> 1471467665 -0700
committer Commit bot <commit-bot@chromium.org> 1471467665 -0700

Add alphaType() to SkImage

Keep isOpaque as a convenience method -- many places really only need to
know that for optimization purposes (SrcOver -> Src, etc...).

In all the places where we pull data back out or convert to another
object and need to supply an SkImageInfo, we can avoid losing information
about premulness.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2250663002

Review-Url: https://codereview.chromium.org/2250663002