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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 SkLerpXfermode_DEFINED
#define SkLerpXfermode_DEFINED
#include "SkXfermode.h"
class SK_API SkLerpXfermode : public SkXfermode {
public:
/**
* result = scale * src + (1 - scale) * dst
*
* When scale == 1, this is the same as kSrc_Mode
* When scale == 0, this is the same as kDst_Mode
*/
static SkXfermode* Create(SkScalar scale);
// overrides from SkXfermode
virtual void xfer32(SkPMColor dst[], const SkPMColor src[], int count,
const SkAlpha aa[]) const SK_OVERRIDE;
virtual void xfer16(uint16_t dst[], const SkPMColor src[], int count,
const SkAlpha aa[]) const SK_OVERRIDE;
virtual void xferA8(SkAlpha dst[], const SkPMColor src[], int count,
const SkAlpha aa[]) const SK_OVERRIDE;
SK_DEVELOPER_TO_STRING()
SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkLerpXfermode)
protected:
SkLerpXfermode(SkFlattenableReadBuffer&);
virtual void flatten(SkFlattenableWriteBuffer&) const SK_OVERRIDE;
private:
SkLerpXfermode(unsigned scale256);
unsigned fScale256; // 0..256
typedef SkXfermode INHERITED;
};
#endif
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