SkDisplacementMapEffect.h revision 336d1d759590d9bedcbc5a96d0fff79861cf8f7a
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) SK_OVERRIDE; 40 virtual void computeFastBounds(const SkRect& src, SkRect* dst) const SK_OVERRIDE; 41 42#if SK_SUPPORT_GPU 43 virtual bool canFilterImageGPU() const SK_OVERRIDE { return true; } 44 virtual bool filterImageGPU(Proxy* proxy, const SkBitmap& src, const SkMatrix& ctm, 45 SkBitmap* result, SkIPoint* offset) SK_OVERRIDE; 46#endif 47 48protected: 49 explicit SkDisplacementMapEffect(SkFlattenableReadBuffer& buffer); 50 virtual void flatten(SkFlattenableWriteBuffer&) const SK_OVERRIDE; 51 52private: 53 ChannelSelectorType fXChannelSelector; 54 ChannelSelectorType fYChannelSelector; 55 SkScalar fScale; 56 typedef SkImageFilter INHERITED; 57 SkImageFilter* getDisplacementInput() { return getInput(0); } 58 SkImageFilter* getColorInput() { return getInput(1); } 59 const SkImageFilter* getDisplacementInput() const { return getInput(0); } 60 const SkImageFilter* getColorInput() const { return getInput(1); } 61}; 62 63#endif 64