/*
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* Copyright 2011 Google Inc.
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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 SkEmptyShader_DEFINED
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#define SkEmptyShader_DEFINED
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#include "SkShaderBase.h"
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// TODO: move this to private, as there is a public factory on SkShader
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/**
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* \class SkEmptyShader
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* A Shader that always draws nothing. Its createContext always returns nullptr.
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*/
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class SkEmptyShader : public SkShaderBase {
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public:
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SkEmptyShader() {}
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protected:
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#ifdef SK_ENABLE_LEGACY_SHADERCONTEXT
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Context* onMakeContext(const ContextRec&, SkArenaAlloc*) const override {
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return nullptr;
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}
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#endif
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void flatten(SkWriteBuffer& buffer) const override {
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// Do nothing.
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// We just don't want to fall through to SkShader::flatten(),
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// which will write data we don't care to serialize or decode.
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}
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bool onAppendStages(const StageRec&) const override {
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return false;
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}
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private:
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SK_FLATTENABLE_HOOKS(SkEmptyShader)
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typedef SkShaderBase INHERITED;
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};
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#endif
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