Implement a computeFastBounds() traversal for SkImageFilter. This allows for correct culling of pri…

include/effects/SkMorphologyImageFilter.h

 /*
  * Copyright 2012 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 SkMorphologyImageFilter_DEFINED
 #define SkMorphologyImageFilter_DEFINED
 
 #include "SkColor.h"
 #include "SkImageFilter.h"
 #include "SkSize.h"
 
 class SK_API SkMorphologyImageFilter : public SkImageFilter {
 public:
     SkMorphologyImageFilter(int radiusX, int radiusY, SkImageFilter* input, const CropRect* cropRect);
+    virtual void computeFastBounds(const SkRect& src, SkRect* dst) const SK_OVERRIDE;
 
     /**
      * All morphology procs have the same signature: src is the source buffer, dst the
      * destination buffer, radius is the morphology radius, width and height are the bounds
      * of the destination buffer (in pixels), and srcStride and dstStride are the
      * number of pixels per row in each buffer. All buffers are 8888.
      */
 
     typedef void (*Proc)(const SkPMColor* src, SkPMColor* dst, int radius,
                          int width, int height, int srcStride, int dstStride);
@@ skipping 58 matching lines @@
     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkErodeImageFilter)
 
 protected:
     SkErodeImageFilter(SkFlattenableReadBuffer& buffer) : INHERITED(buffer) {}
 
 private:
     typedef SkMorphologyImageFilter INHERITED;
 };
 
 #endif