Move willUseInputColor check to computeInvariantOutput

src/core/SkXfermode.cpp

 
 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "SkXfermode.h"
@@ skipping 1195 matching lines @@
             this->setWillReadDstColor();
         }
     }
     virtual bool onIsEqual(const GrFragmentProcessor& other) const SK_OVERRIDE {
         const XferEffect& s = other.cast<XferEffect>();
         return fMode == s.fMode &&
                fBackgroundAccess.getTexture() == s.fBackgroundAccess.getTexture();
     }
 
     virtual void onComputeInvariantOutput(InvariantOutput* inout) const SK_OVERRIDE {
-        inout->setToUnknown();
+        inout->setToUnknown(InvariantOutput::kWill_ReadInput);
     }
 
     SkXfermode::Mode fMode;
     GrCoordTransform fBackgroundTransform;
     GrTextureAccess  fBackgroundAccess;
 
     typedef GrFragmentProcessor INHERITED;
 };
 
 GR_DEFINE_FRAGMENT_PROCESSOR_TEST(XferEffect);
@@ skipping 727 matching lines @@
         } else {
             proc16 = rec.fProc16_General;
         }
     }
     return proc16;
 }
 
 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_START(SkXfermode)
     SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkProcCoeffXfermode)
 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END