Image filters: optimize crop rect application

include/effects/SkMatrixConvolutionImageFilter.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 SkMatrixConvolutionImageFilter_DEFINED
 #define SkMatrixConvolutionImageFilter_DEFINED
 
@@ skipping 62 matching lines @@
                                    const SkIPoint& kernelOffset,
                                    TileMode tileMode,
                                    bool convolveAlpha,
                                    SkImageFilter* input,
                                    const CropRect* cropRect);
     void flatten(SkWriteBuffer&) const override;
 
     bool onFilterImageDeprecated(Proxy*, const SkBitmap& src, const Context&,
                                  SkBitmap* result, SkIPoint* loc) const override;
     SkIRect onFilterNodeBounds(const SkIRect&, const SkMatrix&, MapDirection) const override;
-    bool canComputeFastBounds() const override;
+    bool affectsTransparentBlack() const override;
 
 #if SK_SUPPORT_GPU
     bool asFragmentProcessor(GrFragmentProcessor**, GrTexture*, const SkMatrix&,
                              const SkIRect& bounds) const override;
 #endif
 
 private:
     SkISize   fKernelSize;
     SkScalar* fKernel;
     SkScalar  fGain;
@@ skipping 17 matching lines @@
                               SkBitmap* result,
                               const SkIRect& rect,
                               const SkIRect& bounds) const;
     void filterBorderPixels(const SkBitmap& src,
                             SkBitmap* result,
                             const SkIRect& rect,
                             const SkIRect& bounds) const;
 };
 
 #endif