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 14 class SK_API SkDisplacementMapEffect : public SkImageFilter { 15 public: 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 SkImageFilter* 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 bool onFilterImageDeprecated(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, MapDirection) const override; 43 void onFilterNodeBounds(const SkIRect&, const SkMatrix&, SkIRect*, MapDirection) const override; 44 45 #if SK_SUPPORT_GPU canFilterImageGPU()46 bool canFilterImageGPU() const override { return true; } 47 bool filterImageGPUDeprecated(Proxy* proxy, const SkBitmap& src, const Context& ctx, 48 SkBitmap* result, SkIPoint* offset) const override; 49 #endif 50 51 SK_TO_STRING_OVERRIDE() 52 53 protected: 54 SkDisplacementMapEffect(ChannelSelectorType xChannelSelector, 55 ChannelSelectorType yChannelSelector, 56 SkScalar scale, SkImageFilter* inputs[2], 57 const CropRect* cropRect); 58 void flatten(SkWriteBuffer&) const override; 59 60 private: 61 ChannelSelectorType fXChannelSelector; 62 ChannelSelectorType fYChannelSelector; 63 SkScalar fScale; 64 typedef SkImageFilter INHERITED; getDisplacementInput()65 const SkImageFilter* getDisplacementInput() const { return getInput(0); } getColorInput()66 const SkImageFilter* getColorInput() const { return getInput(1); } 67 }; 68 69 #endif 70