73fa61670d
moved onCreateGLInstance() to private in GrComposeEffect Added SkComposeShader gpu implementation; composeshader gm is unchanged BUG=skia:4182 TBR=bsalomon@google.com Review URL: https://codereview.chromium.org/1292353005
92 lines
3.0 KiB
C++
92 lines
3.0 KiB
C++
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/*
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* Copyright 2006 The Android Open Source Project
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SkComposeShader_DEFINED
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#define SkComposeShader_DEFINED
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#include "SkShader.h"
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class SkXfermode;
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///////////////////////////////////////////////////////////////////////////////////////////
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/** \class SkComposeShader
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This subclass of shader returns the composition of two other shaders, combined by
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a xfermode.
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*/
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class SK_API SkComposeShader : public SkShader {
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public:
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/** Create a new compose shader, given shaders A, B, and a combining xfermode mode.
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When the xfermode is called, it will be given the result from shader A as its
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"dst", and the result from shader B as its "src".
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mode->xfer32(sA_result, sB_result, ...)
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@param shaderA The colors from this shader are seen as the "dst" by the xfermode
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@param shaderB The colors from this shader are seen as the "src" by the xfermode
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@param mode The xfermode that combines the colors from the two shaders. If mode
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is null, then SRC_OVER is assumed.
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*/
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SkComposeShader(SkShader* sA, SkShader* sB, SkXfermode* mode = NULL);
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virtual ~SkComposeShader();
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size_t contextSize() const override;
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#if SK_SUPPORT_GPU
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const GrFragmentProcessor* asFragmentProcessor(GrContext*,
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const SkMatrix& viewM,
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const SkMatrix* localMatrix,
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SkFilterQuality,
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GrProcessorDataManager*) const override;
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#endif
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class ComposeShaderContext : public SkShader::Context {
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public:
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// When this object gets destroyed, it will call contextA and contextB's destructor
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// but it will NOT free the memory.
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ComposeShaderContext(const SkComposeShader&, const ContextRec&,
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SkShader::Context* contextA, SkShader::Context* contextB);
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SkShader::Context* getShaderContextA() const { return fShaderContextA; }
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SkShader::Context* getShaderContextB() const { return fShaderContextB; }
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virtual ~ComposeShaderContext();
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void shadeSpan(int x, int y, SkPMColor[], int count) override;
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private:
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SkShader::Context* fShaderContextA;
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SkShader::Context* fShaderContextB;
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typedef SkShader::Context INHERITED;
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};
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#ifdef SK_DEBUG
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SkShader* getShaderA() { return fShaderA; }
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SkShader* getShaderB() { return fShaderB; }
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#endif
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bool asACompose(ComposeRec* rec) const override;
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SK_TO_STRING_OVERRIDE()
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SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkComposeShader)
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protected:
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SkComposeShader(SkReadBuffer& );
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void flatten(SkWriteBuffer&) const override;
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Context* onCreateContext(const ContextRec&, void*) const override;
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private:
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SkShader* fShaderA;
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SkShader* fShaderB;
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SkXfermode* fMode;
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typedef SkShader INHERITED;
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};
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#endif
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