Update SkLumaMaskXfermode partial coverage handling.
authorfmalita@google.com <fmalita@google.com@2bbb7eff-a529-9590-31e7-b0007b416f81>
Mon, 26 Aug 2013 21:46:34 +0000 (21:46 +0000)
committerfmalita@google.com <fmalita@google.com@2bbb7eff-a529-9590-31e7-b0007b416f81>
Mon, 26 Aug 2013 21:46:34 +0000 (21:46 +0000)
commit3b3ce3bff59daba75c875fc9d25d5dc9d823e8a0
tree4045c1067c9d47dcdf6e7099c7796dcb423a0fb6
parentf272e3554aec86b5d6f7ba44f81f37e5a2070bdc
Update SkLumaMaskXfermode partial coverage handling.

Use lerp-to-dst instead of straight coverage scaling to align the behavior with
the other transfer modes.

R=reed@google.com

Review URL: https://codereview.chromium.org/23453004

git-svn-id: http://skia.googlecode.com/svn/trunk@10927 2bbb7eff-a529-9590-31e7-b0007b416f81
src/effects/SkLumaXfermode.cpp