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/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkDisplacementMapEffect_DEFINED
#define SkDisplacementMapEffect_DEFINED
#include "SkImageFilter.h"
#include "SkBitmap.h"
class SK_API SkDisplacementMapEffect : public SkImageFilter {
public:
enum ChannelSelectorType {
kUnknown_ChannelSelectorType,
kR_ChannelSelectorType,
kG_ChannelSelectorType,
kB_ChannelSelectorType,
kA_ChannelSelectorType,
kKeyBits = 3 // Max value is 4, so 3 bits are required at most
};
SkDisplacementMapEffect(ChannelSelectorType xChannelSelector, ChannelSelectorType yChannelSelector, SkScalar scale, SkImageFilter* displacement, SkImageFilter* color = NULL);
~SkDisplacementMapEffect();
SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkDisplacementMapEffect)
virtual bool onFilterImage(Proxy* proxy,
const SkBitmap& src,
const SkMatrix& ctm,
SkBitmap* dst,
SkIPoint* offset) SK_OVERRIDE;
#if SK_SUPPORT_GPU
virtual bool canFilterImageGPU() const SK_OVERRIDE { return true; }
virtual bool filterImageGPU(Proxy* proxy, const SkBitmap& src, SkBitmap* result) SK_OVERRIDE;
#endif
protected:
explicit SkDisplacementMapEffect(SkFlattenableReadBuffer& buffer);
virtual void flatten(SkFlattenableWriteBuffer&) const SK_OVERRIDE;
private:
ChannelSelectorType fXChannelSelector;
ChannelSelectorType fYChannelSelector;
SkScalar fScale;
typedef SkImageFilter INHERITED;
SkImageFilter* getDisplacementInput() { return getInput(0); }
SkImageFilter* getColorInput() { return getInput(1); }
};
#endif
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