67 lines
2.4 KiB
C
67 lines
2.4 KiB
C
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/*
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* Copyright (C) 2006 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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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 coposition of two other shaders, combined by
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a xfermode.
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*/
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class 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 of 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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// override
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virtual bool setContext(const SkBitmap& device, const SkPaint& paint, const SkMatrix& matrix);
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virtual void shadeSpan(int x, int y, SkPMColor result[], int count);
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virtual void beginSession();
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virtual void endSession();
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protected:
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SkComposeShader(SkFlattenableReadBuffer& );
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virtual void flatten(SkFlattenableWriteBuffer& );
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virtual Factory getFactory() { return CreateProc; }
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private:
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static SkFlattenable* CreateProc(SkFlattenableReadBuffer& buffer) {
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return SkNEW_ARGS(SkComposeShader, (buffer)); }
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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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