text: /*
   * 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
  
  #include "SkTextureCompressor.h"
  #include "SkTypes.h"
  #include "SkXfermode.h"
  
  struct ProcCoeff;
  
  namespace SkOpts {
      // Call to replace pointers to portable functions with pointers to CPU-specific functions.
      // Thread-safe and idempotent.
      // Called by SkGraphics::Init().
      void Init();
  
      // Declare function pointers here...
  
      // 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, 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);
      extern void (*blit_row_s32a_opaque)(SkPMColor*, const SkPMColor*, int, U8CPU);
  
      // 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*);
  
      // Swizzle input into some sort of 8888 pixel, {premul,unpremul} x {rgba,bgra}.
      typedef void (*Swizzle_8888)(uint32_t*, const void*, int);
      extern Swizzle_8888 RGBA_to_BGRA,          // i.e. just swap RB
                          RGBA_to_rgbA,          // i.e. just premultiply
                          RGBA_to_bgrA,          // i.e. swap RB and premultiply
                          RGB_to_RGB1,           // i.e. insert an opaque alpha
                          RGB_to_BGR1,           // i.e. swap RB and insert an opaque alpha
                          gray_to_RGB1,          // i.e. expand to color channels + an opaque alpha
                          grayA_to_RGBA,         // i.e. expand to color channels
                          grayA_to_rgbA,         // i.e. expand to color channels and premultiply
                          inverted_CMYK_to_RGB1, // i.e. convert color space
                          inverted_CMYK_to_BGR1; // i.e. convert color space
  
      // Blend ndst src pixels over dst, where both src and dst point to sRGB pixels (RGBA or BGRA).
      // If nsrc < ndst, we loop over src to create a pattern.
      extern void (*srcover_srgb_srgb)(uint32_t* dst, const uint32_t* src, int ndst, int nsrc);
  
      // The fastest high quality 32-bit hash we can provide on this platform.
      extern uint32_t (*hash_fn)(const void*, size_t, uint32_t seed);
      static inline uint32_t hash(const void* data, size_t bytes, uint32_t seed=0) {
          return hash_fn(data, bytes, seed);
      }
  }
  
  #endif//SkOpts_DEFINED
  