Image filters: Make a recursive, forward-mapping bounds traversal.

include/effects/SkTileImageFilter.h

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkTileImageFilter_DEFINED
 #define SkTileImageFilter_DEFINED
 
 #include "SkImageFilter.h"
 
 class SK_API SkTileImageFilter : public SkImageFilter {
     typedef SkImageFilter INHERITED;
 
 public:
     /** Create a tile image filter
         @param src  Defines the pixels to tile
         @param dst  Defines the pixels where tiles are drawn
         @param input    Input from which the subregion defined by srcRect will be tiled
     */
     static SkImageFilter* Create(const SkRect& src, const SkRect& dst, SkImageFilter* input);
 
     bool onFilterImage(Proxy* proxy, const SkBitmap& src, const Context& ctx,
                        SkBitmap* dst, SkIPoint* offset) const override;
     bool onFilterBounds(const SkIRect& src, const SkMatrix&,
-                        SkIRect* dst) const override;
+                        SkIRect* dst, MapDirection) const override;
     void onFilterNodeBounds(const SkIRect&, const SkMatrix&, SkIRect*, MapDirection) const override;
     void computeFastBounds(const SkRect& src, SkRect* dst) const override;
 
     SK_TO_STRING_OVERRIDE()
     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkTileImageFilter)
 
 protected:
     void flatten(SkWriteBuffer& buffer) const override;
 
 private:
     SkTileImageFilter(const SkRect& srcRect, const SkRect& dstRect, SkImageFilter* input)
         : INHERITED(1, &input, NULL), fSrcRect(srcRect), fDstRect(dstRect) {}
 
     SkRect fSrcRect;
     SkRect fDstRect;
 };
 
 #endif