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 kLast_ChannelSelectorType = kA_ChannelSelectorType 23 }; 24 25 ~SkDisplacementMapEffect() override; 26 27 static sk_sp<SkImageFilter> Make(ChannelSelectorType xChannelSelector, 28 ChannelSelectorType yChannelSelector, 29 SkScalar scale, 30 sk_sp<SkImageFilter> displacement, 31 sk_sp<SkImageFilter> color, 32 const CropRect* cropRect = nullptr); 33 34 SkRect computeFastBounds(const SkRect& src) const override; 35 36 virtual SkIRect onFilterBounds(const SkIRect& src, const SkMatrix& ctm, 37 MapDirection, const SkIRect* inputRect) const override; 38 sk_sp<SkImageFilter> onMakeColorSpace(SkColorSpaceXformer*) const override; 39 SkIRect onFilterNodeBounds(const SkIRect&, const SkMatrix& ctm, 40 MapDirection, const SkIRect* inputRect) const override; 41 42 protected: 43 sk_sp<SkSpecialImage> onFilterImage(SkSpecialImage* source, const Context&, 44 SkIPoint* offset) const override; 45 46 SkDisplacementMapEffect(ChannelSelectorType xChannelSelector, 47 ChannelSelectorType yChannelSelector, 48 SkScalar scale, sk_sp<SkImageFilter> inputs[2], 49 const CropRect* cropRect); 50 void flatten(SkWriteBuffer&) const override; 51 52 private: 53 SK_FLATTENABLE_HOOKS(SkDisplacementMapEffect) 54 55 ChannelSelectorType fXChannelSelector; 56 ChannelSelectorType fYChannelSelector; 57 SkScalar fScale; 58 typedef SkImageFilter INHERITED; getDisplacementInput()59 const SkImageFilter* getDisplacementInput() const { return getInput(0); } getColorInput()60 const SkImageFilter* getColorInput() const { return getInput(1); } 61 }; 62 63 #endif 64