text: /*
   * Copyright 2007 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 SkPixelXorXfermode_DEFINED
  #define SkPixelXorXfermode_DEFINED
  
  #include "SkXfermode.h"
  
  /** SkPixelXorXfermode implements a simple pixel xor (op ^ src ^ dst).
      This transformation does not follow premultiplied conventions, therefore
      this proc *always* returns an opaque color (alpha == 255). Thus it is
      not really usefull for operating on blended colors.
  */
  class SK_API SkPixelXorXfermode : public SkXfermode {
  public:
      static SkXfermode* Create(SkColor opColor) {
          return new SkPixelXorXfermode(opColor);
      }
  
  #if SK_SUPPORT_GPU
      const GrFragmentProcessor* getFragmentProcessorForImageFilter(
                                                      const GrFragmentProcessor* dst) const override;
      GrXPFactory* asXPFactory() const override;
  #endif
  
      SK_TO_STRING_OVERRIDE()
      SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkPixelXorXfermode)
  
  protected:
      void flatten(SkWriteBuffer&) const override;
      SkPMColor xferColor(SkPMColor src, SkPMColor dst) const override;
  
  private:
      explicit SkPixelXorXfermode(SkColor opColor) {
          fOpColor = SkPreMultiplyColor(opColor | 0xFF000000);
      }
  
      SkPMColor fOpColor;
  
      typedef SkXfermode INHERITED;
  };
  
  #endif
  