michael@0: /*
michael@0:  * Copyright 2013 Google Inc.
michael@0:  *
michael@0:  * Use of this source code is governed by a BSD-style license that can be
michael@0:  * found in the LICENSE file.
michael@0:  */
michael@0: 
michael@0: #ifndef SkLerpXfermode_DEFINED
michael@0: #define SkLerpXfermode_DEFINED
michael@0: 
michael@0: #include "SkXfermode.h"
michael@0: 
michael@0: class SK_API SkLerpXfermode : public SkXfermode {
michael@0: public:
michael@0:     /**
michael@0:      *  result = scale * src + (1 - scale) * dst
michael@0:      *
michael@0:      *  When scale == 1, this is the same as kSrc_Mode
michael@0:      *  When scale == 0, this is the same as kDst_Mode
michael@0:      */
michael@0:     static SkXfermode* Create(SkScalar scale);
michael@0: 
michael@0:     // overrides from SkXfermode
michael@0:     virtual void xfer32(SkPMColor dst[], const SkPMColor src[], int count,
michael@0:                         const SkAlpha aa[]) const SK_OVERRIDE;
michael@0:     virtual void xfer16(uint16_t dst[], const SkPMColor src[], int count,
michael@0:                         const SkAlpha aa[]) const SK_OVERRIDE;
michael@0:     virtual void xferA8(SkAlpha dst[], const SkPMColor src[], int count,
michael@0:                         const SkAlpha aa[]) const SK_OVERRIDE;
michael@0: 
michael@0:     SK_TO_STRING_OVERRIDE()
michael@0:     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkLerpXfermode)
michael@0: 
michael@0: protected:
michael@0:     SkLerpXfermode(SkReadBuffer&);
michael@0:     virtual void flatten(SkWriteBuffer&) const SK_OVERRIDE;
michael@0: 
michael@0: private:
michael@0:     SkLerpXfermode(unsigned scale256);
michael@0: 
michael@0:     unsigned fScale256;  // 0..256
michael@0: 
michael@0:     typedef SkXfermode INHERITED;
michael@0: };
michael@0: 
michael@0: #endif