Romain Guy 48daa54d31 Add extra blending modes.
This change adds the following blending modes for shaders and color filters:
Add
Multiply
Screen
Overlay
Darken
Lighten

Change-Id: Iff22f5ce6041b43c71b1857d73013f5010ab3413
2010-08-10 21:42:40 -07:00
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2010-08-10 21:42:40 -07:00
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