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/*
* Copyright 2006 The Android Open Source Project
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkComposeShader_DEFINED
#define SkComposeShader_DEFINED
#include "SkShader.h"
class SkXfermode;
///////////////////////////////////////////////////////////////////////////////////////////
/** \class SkComposeShader
This subclass of shader returns the coposition of two other shaders, combined by
a xfermode.
*/
class SK_API SkComposeShader : public SkShader {
public:
/** Create a new compose shader, given shaders A, B, and a combining xfermode mode.
When the xfermode is called, it will be given the result from shader A as its
"dst", and the result of from shader B as its "src".
mode->xfer32(sA_result, sB_result, ...)
@param shaderA The colors from this shader are seen as the "dst" by the xfermode
@param shaderB The colors from this shader are seen as the "src" by the xfermode
@param mode The xfermode that combines the colors from the two shaders. If mode
is null, then SRC_OVER is assumed.
*/
SkComposeShader(SkShader* sA, SkShader* sB, SkXfermode* mode = NULL);
virtual ~SkComposeShader();
virtual bool setContext(const SkBitmap&, const SkPaint&,
const SkMatrix&) SK_OVERRIDE;
virtual void endContext() SK_OVERRIDE;
virtual void shadeSpan(int x, int y, SkPMColor[], int count) SK_OVERRIDE;
SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkComposeShader)
protected:
SkComposeShader(SkFlattenableReadBuffer& );
virtual void flatten(SkFlattenableWriteBuffer&) const SK_OVERRIDE;
private:
SkShader* fShaderA;
SkShader* fShaderB;
SkXfermode* fMode;
typedef SkShader INHERITED;
};
#endif
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