2 * Copyright 2011 Google Inc.
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
8 #ifndef SkEmptyShader_DEFINED
9 #define SkEmptyShader_DEFINED
11 #include "src/shaders/SkShaderBase.h"
13 // TODO: move this to private, as there is a public factory on SkShader
16 * \class SkEmptyShader
17 * A Shader that always draws nothing. Its createContext always returns nullptr.
19 class SkEmptyShader : public SkShaderBase {
24 #ifdef SK_ENABLE_LEGACY_SHADERCONTEXT
25 Context* onMakeContext(const ContextRec&, SkArenaAlloc*) const override {
30 void flatten(SkWriteBuffer& buffer) const override {
32 // We just don't want to fall through to SkShader::flatten(),
33 // which will write data we don't care to serialize or decode.
36 bool onAppendStages(const SkStageRec&) const override {
40 skvm::Color onProgram(skvm::Builder*, skvm::Coord, skvm::Coord, skvm::Color,
41 const SkMatrixProvider&, const SkMatrix*, const SkColorInfo&,
42 skvm::Uniforms*, SkArenaAlloc*) const override;
45 SK_FLATTENABLE_HOOKS(SkEmptyShader)
47 using INHERITED = SkShaderBase;