Replace GrExtractAlphaFragmentProcessor with DstIn compose processor

src/effects/gradients/SkSweepGradient.cpp

 
 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkSweepGradient.h"
 
@@ skipping 149 matching lines @@
             toggle = next_dither_toggle16(toggle);
         }
     }
 }
 
 /////////////////////////////////////////////////////////////////////
 
 #if SK_SUPPORT_GPU
 
 #include "SkGr.h"
-#include "effects/GrExtractAlphaFragmentProcessor.h"
 #include "gl/builders/GrGLProgramBuilder.h"
 
 class GrGLSweepGradient : public GrGLGradientEffect {
 public:
 
     GrGLSweepGradient(const GrProcessor&) {}
     virtual ~GrGLSweepGradient() { }
 
     virtual void emitCode(EmitArgs&) override;
 
@@ skipping 104 matching lines @@
         SkMatrix inv;
         if (!localMatrix->invert(&inv)) {
             return nullptr;
         }
         matrix.postConcat(inv);
     }
     matrix.postConcat(fPtsToUnit);
 
     SkAutoTUnref<const GrFragmentProcessor> inner(
         GrSweepGradient::Create(context, procDataManager, *this, matrix));
-    return GrExtractAlphaFragmentProcessor::Create(inner);
+    return GrFragmentProcessor::MulOuputByInputAlpha(inner);
 }
 
 #endif
 
 #ifndef SK_IGNORE_TO_STRING
 void SkSweepGradient::toString(SkString* str) const {
     str->append("SkSweepGradient: (");
 
     str->append("center: (");
     str->appendScalar(fCenter.fX);
     str->append(", ");
     str->appendScalar(fCenter.fY);
     str->append(") ");
 
     this->INHERITED::toString(str);
 
     str->append(")");
 }
 #endif