Implement crop rect support for SkMatrixConvolutionImageFilter.

include/core/SkImageFilter.h

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkImageFilter_DEFINED
 #define SkImageFilter_DEFINED
 
@@ skipping 71 matching lines @@
     /**
      *  Given the src bounds of an image, this returns the bounds of the result
      *  image after the filter has been applied.
      */
     bool filterBounds(const SkIRect& src, const SkMatrix& ctm, SkIRect* dst);
 
     /**
      *  Returns true if the filter can be processed on the GPU.  This is most
      *  often used for multi-pass effects, where intermediate results must be
      *  rendered to textures.  For single-pass effects, use asNewEffect().
-     *  The default implementation returns asNewEffect(NULL, NULL, SkMatrix::I()).
+     *  The default implementation returns asNewEffect(NULL, NULL, SkMatrix::I(),
+     *  SkIRect()).
      */
     virtual bool canFilterImageGPU() const;
 
     /**
      *  Process this image filter on the GPU.  This is most often used for
      *  multi-pass effects, where intermediate results must be rendered to
      *  textures.  For single-pass effects, use asNewEffect().  src is the
      *  source image for processing, as a texture-backed bitmap.  result is
      *  the destination bitmap, which should contain a texture-backed pixelref
      *  on success.  offset is the amount to translate the resulting image
@@ skipping 73 matching lines @@
      *  If effect is non-NULL, a new GrEffect instance is stored
      *  in it.  The caller assumes ownership of the stage, and it is up to the
      *  caller to unref it.
      *
      *  The effect can assume its vertexCoords space maps 1-to-1 with texels
      *  in the texture.  "matrix" is a transformation to apply to filter
      *  parameters before they are used in the effect. Note that this function
      *  will be called with (NULL, NULL, SkMatrix::I()) to query for support,
      *  so returning "true" indicates support for all possible matrices.
      */
-    virtual bool asNewEffect(GrEffectRef** effect, GrTexture*, const SkMatrix& matrix) const;
+    virtual bool asNewEffect(GrEffectRef** effect,
+                             GrTexture*,
+                             const SkMatrix& matrix,
+                             const SkIRect& bounds) const;

[reed1, 2013/10/18 18:57:35]

shot in the dark : is this correct to be IRect, and not Rect?

 
 private:
     typedef SkFlattenable INHERITED;
     int fInputCount;
     SkImageFilter** fInputs;
     CropRect fCropRect;
 };
 
 #endif