| /* |
| * 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 "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 |