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 13 class SK_API SkDisplacementMapEffect : public SkImageFilter { 14 public: 15 enum ChannelSelectorType { 16 kUnknown_ChannelSelectorType, 17 kR_ChannelSelectorType, 18 kG_ChannelSelectorType, 19 kB_ChannelSelectorType, 20 kA_ChannelSelectorType 21 }; 22 23 ~SkDisplacementMapEffect() override; 24 25 static sk_sp<SkImageFilter> Make(ChannelSelectorType xChannelSelector, 26 ChannelSelectorType yChannelSelector, 27 SkScalar scale, 28 sk_sp<SkImageFilter> displacement, 29 sk_sp<SkImageFilter> color, 30 const CropRect* cropRect = nullptr); 31 32 SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkDisplacementMapEffect) 33 34 SkRect computeFastBounds(const SkRect& src) const override; 35 36 virtual SkIRect onFilterBounds(const SkIRect& src, const SkMatrix&, 37 MapDirection) const override; 38 sk_sp<SkImageFilter> onMakeColorSpace(SkColorSpaceXformer*) const override; 39 SkIRect onFilterNodeBounds(const SkIRect&, const SkMatrix&, MapDirection) const override; 40 41 SK_TO_STRING_OVERRIDE() 42 43 protected: 44 sk_sp<SkSpecialImage> onFilterImage(SkSpecialImage* source, const Context&, 45 SkIPoint* offset) const override; 46 47 SkDisplacementMapEffect(ChannelSelectorType xChannelSelector, 48 ChannelSelectorType yChannelSelector, 49 SkScalar scale, sk_sp<SkImageFilter> inputs[2], 50 const CropRect* cropRect); 51 void flatten(SkWriteBuffer&) const override; 52 53 private: 54 ChannelSelectorType fXChannelSelector; 55 ChannelSelectorType fYChannelSelector; 56 SkScalar fScale; 57 typedef SkImageFilter INHERITED; 58 const SkImageFilter* getDisplacementInput() const { return getInput(0); } 59 const SkImageFilter* getColorInput() const { return getInput(1); } 60 }; 61 62 #endif 63
