/* * Copyright 2011 Google Inc. * * Use of this source code is governed by a BSD-style license that can be * found in the LICENSE file. */ #ifndef SkEmptyShader_DEFINED #define SkEmptyShader_DEFINED #include "src/shaders/SkShaderBase.h" // TODO: move this to private, as there is a public factory on SkShader /** * \class SkEmptyShader * A Shader that always draws nothing. Its createContext always returns nullptr. */ class SkEmptyShader : public SkShaderBase { public: SkEmptyShader() {} protected: #ifdef SK_ENABLE_LEGACY_SHADERCONTEXT Context* onMakeContext(const ContextRec&, SkArenaAlloc*) const override { return nullptr; } #endif void flatten(SkWriteBuffer& buffer) const override { // Do nothing. // We just don't want to fall through to SkShader::flatten(), // which will write data we don't care to serialize or decode. } bool onAppendStages(const SkStageRec&) const override { return false; } private: SK_FLATTENABLE_HOOKS(SkEmptyShader) typedef SkShaderBase INHERITED; }; #endif