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/gradients/SkGradientShaderPriv.h b/src/effects/gradients/SkGradientShaderPriv.h
index 552013e..b2b8c47 100644
--- a/src/effects/gradients/SkGradientShaderPriv.h
+++ b/src/effects/gradients/SkGradientShaderPriv.h
@@ -243,6 +243,15 @@
fYCoord == s.getYCoord() && fMatrix.cheapEqualTo(s.getMatrix());
}
+ virtual void getConstantColorComponents(GrColor* color,
+ uint32_t* validFlags) const SK_OVERRIDE {
+ if (fIsOpaque && (kA_ValidComponentFlag & *validFlags) && 0xff == GrColorUnpackA(*color)) {
+ *validFlags = kA_ValidComponentFlag;
+ } else {
+ *validFlags = 0;
+ }
+ }
+
protected:
/** Populates a pair of arrays with colors and stop info to construct a random gradient.
@@ -264,6 +273,7 @@
GrTextureStripAtlas* fAtlas;
int fRow;
SkMatrix fMatrix;
+ bool fIsOpaque;
typedef GrEffect INHERITED;