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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"
class SK_API SkDisplacementMapEffect : public SkImageFilter {
public:
enum ChannelSelectorType {
kUnknown_ChannelSelectorType,
kR_ChannelSelectorType,
kG_ChannelSelectorType,
kB_ChannelSelectorType,
kA_ChannelSelectorType,
kLast_ChannelSelectorType = kA_ChannelSelectorType
};
~SkDisplacementMapEffect() override;
static sk_sp<SkImageFilter> Make(ChannelSelectorType xChannelSelector,
ChannelSelectorType yChannelSelector,
SkScalar scale,
sk_sp<SkImageFilter> displacement,
sk_sp<SkImageFilter> color,
const CropRect* cropRect = nullptr);
SkRect computeFastBounds(const SkRect& src) const override;
virtual SkIRect onFilterBounds(const SkIRect& src, const SkMatrix& ctm,
MapDirection, const SkIRect* inputRect) const override;
sk_sp<SkImageFilter> onMakeColorSpace(SkColorSpaceXformer*) const override;
SkIRect onFilterNodeBounds(const SkIRect&, const SkMatrix& ctm,
MapDirection, const SkIRect* inputRect) const override;
void toString(SkString* str) const override;
Factory getFactory() const override { return CreateProc; }
protected:
sk_sp<SkSpecialImage> onFilterImage(SkSpecialImage* source, const Context&,
SkIPoint* offset) const override;
SkDisplacementMapEffect(ChannelSelectorType xChannelSelector,
ChannelSelectorType yChannelSelector,
SkScalar scale, sk_sp<SkImageFilter> inputs[2],
const CropRect* cropRect);
void flatten(SkWriteBuffer&) const override;
private:
static sk_sp<SkFlattenable> CreateProc(SkReadBuffer&);
friend class SkFlattenable::PrivateInitializer;
ChannelSelectorType fXChannelSelector;
ChannelSelectorType fYChannelSelector;
SkScalar fScale;
typedef SkImageFilter INHERITED;
const SkImageFilter* getDisplacementInput() const { return getInput(0); }
const SkImageFilter* getColorInput() const { return getInput(1); }
};
#endif
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