Add SkRasterPipeline blitter.

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;
+class SkRasterPipeline;
 
 /**
  *  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).
  *
  *  All subclasses are required to be reentrant-safe : it must be legal to share
  *  the same instance between several threads.
  */
 class SK_API SkColorFilter : public SkFlattenable {
@@ skipping 34 matching lines @@
         The implementation writes out its filtered version into result[].
         Note: shader and result may be the same buffer.
         @param src      array of colors, possibly generated by a shader
         @param count    the number of entries in the src[] and result[] arrays
         @param result   written by the filter
     */
     virtual void filterSpan(const SkPMColor src[], int count, SkPMColor result[]) const = 0;
 
     virtual void filterSpan4f(const SkPM4f src[], int count, SkPM4f result[]) const;
 
+    bool appendStages(SkRasterPipeline*) const;
+
     enum Flags {
         /** If set the filter methods will not change the alpha channel of the colors.
         */
         kAlphaUnchanged_Flag = 1 << 0,
     };
 
     /** Returns the flags for this filter. Override in subclasses to return custom flags.
     */
     virtual uint32_t getFlags() const { return 0; }
 
@@ skipping 78 matching lines @@
     }
 
     SK_TO_STRING_PUREVIRT()
 
     SK_DECLARE_FLATTENABLE_REGISTRAR_GROUP()
     SK_DEFINE_FLATTENABLE_TYPE(SkColorFilter)
 
 protected:
     SkColorFilter() {}
 
+    virtual bool onAppendStages(SkRasterPipeline*) const;
+
 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