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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 composition of two other shaders, combined by
a xfermode.
class SK_API SkComposeShader : public SkShader {
/** 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 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 size_t contextSize() const SK_OVERRIDE;
class ComposeShaderContext : public SkShader::Context {
// When this object gets destroyed, it will call contextA and contextB's destructor
// but it will NOT free the memory.
ComposeShaderContext(const SkComposeShader&, const ContextRec&,
SkShader::Context* contextA, SkShader::Context* contextB);
SkShader::Context* getShaderContextA() const { return fShaderContextA; }
SkShader::Context* getShaderContextB() const { return fShaderContextB; }
virtual ~ComposeShaderContext();
virtual void shadeSpan(int x, int y, SkPMColor[], int count) SK_OVERRIDE;
SkShader::Context* fShaderContextA;
SkShader::Context* fShaderContextB;
typedef SkShader::Context INHERITED;
#ifdef SK_DEBUG
SkShader* getShaderA() { return fShaderA; }
SkShader* getShaderB() { return fShaderB; }
virtual bool asACompose(ComposeRec* rec) const SK_OVERRIDE;
SkComposeShader(SkReadBuffer& );
virtual void flatten(SkWriteBuffer&) const SK_OVERRIDE;
virtual Context* onCreateContext(const ContextRec&, void*) const SK_OVERRIDE;
SkShader* fShaderA;
SkShader* fShaderB;
SkXfermode* fMode;
typedef SkShader INHERITED;