Add GrEffect::updateKnownColorComponents(). It is used to determine whether the output of an effect has a constant output value for r,g,b, or a.
Review URL: https://codereview.appspot.com/7064057
git-svn-id: http://skia.googlecode.com/svn/trunk@7144 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/effects/SkLightingImageFilter.cpp b/src/effects/SkLightingImageFilter.cpp
index 48f16b3..fc819de 100644
--- a/src/effects/SkLightingImageFilter.cpp
+++ b/src/effects/SkLightingImageFilter.cpp
@@ -311,6 +311,13 @@
const SkLight* light() const { return fLight; }
SkScalar surfaceScale() const { return fSurfaceScale; }
+
+ virtual void getConstantColorComponents(GrColor* color,
+ uint32_t* validFlags) const SK_OVERRIDE {
+ // lighting shaders are complicated. We just throw up our hands.
+ *validFlags = 0;
+ }
+
private:
typedef GrSingleTextureEffect INHERITED;
const SkLight* fLight;