tree 5f388143328f0fff5bd19f2cc3aab5de79466f33
parent 528a11af35c7f68a641ea782a4dca18b3835b5b3
author Pascal Massimino <pascal.massimino@gmail.com> 1344537209 -0700
committer Pascal Massimino <pascal.massimino@gmail.com> 1344537209 -0700

avoid rgb-premultiply if there's only trivial alpha values

With this, MODE_rgbA can safely be used without speed penalty
even in case of pure-lossy alpha-less input.
It's also an optimization when cropping a fully-opaque region from
an image with alpha: premultiply is then skipped

Change-Id: Ibee28c75744f193dacdfccd5a2e7cd1e44604db6