Make SkBlurImageFilter capable of cropping during blur

src/core/SkOpts.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkOpts_DEFINED
 #define SkOpts_DEFINED
 
@@ skipping 15 matching lines @@
     // Returns a fast approximation of 1.0f/sqrtf(x).
     extern float (*rsqrt)(float);
 
     // See SkUtils.h
     extern void (*memset16)(uint16_t[], uint16_t, int);
     extern void (*memset32)(uint32_t[], uint32_t, int);
 
     // May return nullptr if we haven't specialized the given Mode.
     extern SkXfermode* (*create_xfermode)(const ProcCoeff&, SkXfermode::Mode);
 
-    typedef void (*BoxBlur)(const SkPMColor*, int, SkPMColor*, int, int, int, int, int);
+    typedef void (*BoxBlur)(const SkPMColor*, int, const SkIRect& srcBounds, SkPMColor*, int, int, int, int, int);
     extern BoxBlur box_blur_xx, box_blur_xy, box_blur_yx;
 
     typedef void (*Morph)(const SkPMColor*, SkPMColor*, int, int, int, int, int);
     extern Morph dilate_x, dilate_y, erode_x, erode_y;
 
     typedef bool (*TextureCompressor)(uint8_t* dst, const uint8_t* src,
                                       int width, int height, size_t rowBytes);
     extern TextureCompressor (*texture_compressor)(SkColorType, SkTextureCompressor::Format);
     extern bool (*fill_block_dimensions)(SkTextureCompressor::Format, int* x, int* y);
 
     extern void (*blit_mask_d32_a8)(SkPMColor*, size_t, const SkAlpha*, size_t, SkColor, int, int);
     extern void (*blit_row_color32)(SkPMColor*, const SkPMColor*, int, SkPMColor);
 
     // This function is an optimized version of SkColorCubeFilter::filterSpan
     extern void (*color_cube_filter_span)(const SkPMColor[],
                                           int,
                                           SkPMColor[],
                                           const int * [2],
                                           const SkScalar * [2],
                                           int,
                                           const SkColor*);
 
     extern SkMatrix::MapPtsProc matrix_translate, matrix_scale_translate, matrix_affine;
 }
 
 #endif//SkOpts_DEFINED