sk_sp for gpu.

include/core/SkColorFilter.h

 /*
  * 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.
  */
 
 #ifndef SkColorFilter_DEFINED
 #define SkColorFilter_DEFINED
 
 #include "SkColor.h"
 #include "SkFlattenable.h"
+#include "SkRefCnt.h"
 #include "SkXfermode.h"
 
 class GrContext;
 class GrFragmentProcessor;
 class SkBitmap;
 
 /**
  *  ColorFilters are optional objects in the drawing pipeline. When present in
  *  a paint, they are called with the "src" colors, and return new colors, which
  *  are then passed onto the next stage (either ImageFilter or Xfermode).
@@ skipping 112 matching lines @@
         return MakeComposeFilter(sk_ref_sp(outer), sk_ref_sp(inner)).release();
     }
     static SkColorFilter* CreateMatrixFilterRowMajor255(const SkScalar array[20]) {
         return MakeMatrixFilterRowMajor255(array).release();
     }
     virtual SkColorFilter* newComposed(const SkColorFilter* inner) const {
         return this->makeComposed(sk_ref_sp(const_cast<SkColorFilter*>(inner))).release();
     }
 #endif
 
+#if SK_SUPPORT_GPU
     /**
      *  A subclass may implement this factory function to work with the GPU backend. It returns
      *  a GrFragmentProcessor that implemets the color filter in GPU shader code.
      *
      *  The fragment processor receives a premultiplied input color and produces a premultiplied
      *  output color.
      *
      *  A null return indicates that the color filter isn't implemented for the GPU backend.
      */
-    virtual const GrFragmentProcessor* asFragmentProcessor(GrContext*) const {
-        return nullptr;
-    }
+    virtual sk_sp<GrFragmentProcessor> asFragmentProcessor(GrContext*) const;
+#endif
 
     bool affectsTransparentBlack() const {
         return this->filterColor(0) != 0;
     }
 
     SK_TO_STRING_PUREVIRT()
 
     SK_DECLARE_FLATTENABLE_REGISTRAR_GROUP()
     SK_DEFINE_FLATTENABLE_TYPE(SkColorFilter)
 
 protected:
     SkColorFilter() {}
 
 private:
     /*
      *  Returns 1 if this is a single filter (not a composition of other filters), otherwise it
      *  reutrns the number of leaf-node filters in a composition. This should be the same value
      *  as the number of GrFragmentProcessors returned by asFragmentProcessors's array parameter.
      *
      *  e.g. compose(filter, compose(compose(filter, filter), filter)) --> 4
      */
     virtual int privateComposedFilterCount() const { return 1; }
     friend class SkComposeColorFilter;
 
     typedef SkFlattenable INHERITED;
 };
 
 #endif