tree eac8bfd2fc7f7d9a5e3c532b2c57ef2eafcb31d4
parent 74d80eba370557c22cebef6c3be0875c32e1b17b
author egdaniel <egdaniel@google.com> 1416939896 -0800
committer Commit bot <commit-bot@chromium.org> 1416939896 -0800

Update invariant output computation for various texture effects.

Update various effects that read in textures to check whether or not the texture is alpha only.
This allows us to use a more specific mulByUnKnownAlpha instead of the more general mulByUnknownColor

BUG=skia:

Review URL: https://codereview.chromium.org/759653004