1/* 2 * Copyright 2013 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8#ifndef SkDisplacementMapEffect_DEFINED 9#define SkDisplacementMapEffect_DEFINED 10 11#include "SkImageFilter.h" 12#include "SkBitmap.h" 13 14class SK_API SkDisplacementMapEffect : public SkImageFilter { 15public: 16 enum ChannelSelectorType { 17 kUnknown_ChannelSelectorType, 18 kR_ChannelSelectorType, 19 kG_ChannelSelectorType, 20 kB_ChannelSelectorType, 21 kA_ChannelSelectorType 22 }; 23 24 ~SkDisplacementMapEffect(); 25 26 static SkDisplacementMapEffect* Create(ChannelSelectorType xChannelSelector, 27 ChannelSelectorType yChannelSelector, 28 SkScalar scale, SkImageFilter* displacement, 29 SkImageFilter* color = NULL, 30 const CropRect* cropRect = NULL); 31 32 SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkDisplacementMapEffect) 33 34 virtual bool onFilterImage(Proxy* proxy, 35 const SkBitmap& src, 36 const Context& ctx, 37 SkBitmap* dst, 38 SkIPoint* offset) const override; 39 void computeFastBounds(const SkRect& src, SkRect* dst) const override; 40 41 virtual bool onFilterBounds(const SkIRect& src, const SkMatrix&, 42 SkIRect* dst) const override; 43 44#if SK_SUPPORT_GPU 45 bool canFilterImageGPU() const override { return true; } 46 virtual bool filterImageGPU(Proxy* proxy, const SkBitmap& src, const Context& ctx, 47 SkBitmap* result, SkIPoint* offset) const override; 48#endif 49 50 SK_TO_STRING_OVERRIDE() 51 52protected: 53 SkDisplacementMapEffect(ChannelSelectorType xChannelSelector, 54 ChannelSelectorType yChannelSelector, 55 SkScalar scale, SkImageFilter* inputs[2], 56 const CropRect* cropRect); 57 void flatten(SkWriteBuffer&) const override; 58 59private: 60 ChannelSelectorType fXChannelSelector; 61 ChannelSelectorType fYChannelSelector; 62 SkScalar fScale; 63 typedef SkImageFilter INHERITED; 64 const SkImageFilter* getDisplacementInput() const { return getInput(0); } 65 const SkImageFilter* getColorInput() const { return getInput(1); } 66}; 67 68#endif 69