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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 SkLumaXfermode_DEFINED
#define SkLumaXfermode_DEFINED
#include "SkXfermode.h"
/**
* Luminance mask transfer, as defined in
* http://www.w3.org/TR/SVG/masking.html#Masking
* http://www.w3.org/TR/css-masking/#MaskValues
*
* The luminance-to-alpha function is applied before performing a standard
* SrcIn/DstIn/SrcOver xfer:
*
* luma(C) = (0.2125 * C.r + 0.7154 * C.g + 0.0721 * C.b) * C.a
*
* (where C is un-premultiplied)
*/
class SK_API SkLumaMaskXfermode : public SkXfermode {
public:
/** Return an SkLumaMaskXfermode object for the specified submode.
*
* Only kSrcIn_Mode, kDstIn_Mode kSrcOver_Mode are supported - for everything else,
* the factory returns NULL.
*/
static SkXfermode* Create(SkXfermode::Mode);
virtual SkPMColor xferColor(SkPMColor, SkPMColor) const SK_OVERRIDE;
virtual void xfer32(SkPMColor dst[], const SkPMColor src[], int count,
const SkAlpha aa[]) const SK_OVERRIDE;
SK_DEVELOPER_TO_STRING()
SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkLumaMaskXfermode)
SK_DECLARE_FLATTENABLE_REGISTRAR_GROUP()
#if SK_SUPPORT_GPU
virtual bool asNewEffectOrCoeff(GrContext*, GrEffectRef**, Coeff*, Coeff*,
GrTexture*) const SK_OVERRIDE;
#endif
protected:
SkLumaMaskXfermode(SkFlattenableReadBuffer&);
virtual void flatten(SkFlattenableWriteBuffer&) const SK_OVERRIDE;
SkLumaMaskXfermode(SkXfermode::Mode);
private:
const SkXfermode::Mode fMode;
typedef SkXfermode INHERITED;
virtual SkPMColor lumaProc(const SkPMColor a, const SkPMColor b) const;
};
#endif
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