Revert "Revert "Start of rewrite of GrFragmentProcessor optimizations.""

This reverts commit 052fd5158f7f85e478a9f87c45fecaacf7d0f5f3.

Disables the test (of unused code) until platform-specific issues are addressed.

Change-Id: I7aa23a07954fccf382aa07d28afcbffb0bebcd6d
Reviewed-on: https://skia-review.googlesource.com/7656
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>

1 files changed, 9 insertions, 1 deletions

diff --git a/src/effects/SkLumaColorFilter.cpp b/src/effects/SkLumaColorFilter.cpp
index a9516af63d..1792437e34 100644
--- a/src/effects/SkLumaColorFilter.cpp
+++ b/src/effects/SkLumaColorFilter.cpp
@@ -98,7 +98,7 @@ public:
     };
 
 private:
-    LumaColorFilterEffect() {
+    LumaColorFilterEffect() : INHERITED(kConstantOutputForConstantInput_OptimizationFlag) {
         this->initClassID<LumaColorFilterEffect>();
     }
 
@@ -117,6 +117,14 @@ private:
         // The output is always black. The alpha value for the color passed in is arbitrary.
         inout->setToOther(kRGB_GrColorComponentFlags, GrColorPackRGBA(0, 0, 0, 0));
     }
+    GrColor4f constantOutputForConstantInput(GrColor4f input) const override {
+        float luma = SK_ITU_BT709_LUM_COEFF_R * input.fRGBA[0] +
+                     SK_ITU_BT709_LUM_COEFF_G * input.fRGBA[1] +
+                     SK_ITU_BT709_LUM_COEFF_B * input.fRGBA[2];
+        return GrColor4f(0, 0, 0, luma);
+    }
+
+    typedef GrFragmentProcessor INHERITED;
 };
 
 sk_sp<GrFragmentProcessor> SkLumaColorFilter::asFragmentProcessor(GrContext*, SkColorSpace*) const {