SkDisplacementMapEffect.h revision ae761f7545d8ebf181d220169afac2056b057b8c
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 kKeyBits = 3 // Max value is 4, so 3 bits are required at most 23 }; 24 25 SkDisplacementMapEffect(ChannelSelectorType xChannelSelector, 26 ChannelSelectorType yChannelSelector, 27 SkScalar scale, SkImageFilter* displacement, 28 SkImageFilter* color = NULL, 29 const CropRect* cropRect = NULL); 30 31 ~SkDisplacementMapEffect(); 32 33 SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkDisplacementMapEffect) 34 35 virtual bool onFilterImage(Proxy* proxy, 36 const SkBitmap& src, 37 const SkMatrix& ctm, 38 SkBitmap* dst, 39 SkIPoint* offset) const SK_OVERRIDE; 40 virtual void computeFastBounds(const SkRect& src, SkRect* dst) const SK_OVERRIDE; 41 42 virtual bool onFilterBounds(const SkIRect& src, const SkMatrix&, 43 SkIRect* dst) const SK_OVERRIDE; 44 45#if SK_SUPPORT_GPU 46 virtual bool canFilterImageGPU() const SK_OVERRIDE { return true; } 47 virtual bool filterImageGPU(Proxy* proxy, const SkBitmap& src, const SkMatrix& ctm, 48 SkBitmap* result, SkIPoint* offset) const SK_OVERRIDE; 49#endif 50 51protected: 52 explicit SkDisplacementMapEffect(SkReadBuffer& buffer); 53 virtual void flatten(SkWriteBuffer&) const SK_OVERRIDE; 54 55private: 56 ChannelSelectorType fXChannelSelector; 57 ChannelSelectorType fYChannelSelector; 58 SkScalar fScale; 59 typedef SkImageFilter INHERITED; 60 const SkImageFilter* getDisplacementInput() const { return getInput(0); } 61 const SkImageFilter* getColorInput() const { return getInput(1); } 62}; 63 64#endif 65