reed@google.com | 37a2012 | 2011-07-05 18:54:12 +0000 | [diff] [blame] | 1 | /* |
epoger@google.com | ec3ed6a | 2011-07-28 14:26:00 +0000 | [diff] [blame] | 2 | * Copyright 2011 Google Inc. |
| 3 | * |
| 4 | * Use of this source code is governed by a BSD-style license that can be |
| 5 | * found in the LICENSE file. |
reed@google.com | 37a2012 | 2011-07-05 18:54:12 +0000 | [diff] [blame] | 6 | */ |
| 7 | |
reed@google.com | 37a2012 | 2011-07-05 18:54:12 +0000 | [diff] [blame] | 8 | #ifndef SkEmptyShader_DEFINED |
| 9 | #define SkEmptyShader_DEFINED |
| 10 | |
Mike Klein | c0bd9f9 | 2019-04-23 12:05:21 -0500 | [diff] [blame] | 11 | #include "src/shaders/SkShaderBase.h" |
reed@google.com | 37a2012 | 2011-07-05 18:54:12 +0000 | [diff] [blame] | 12 | |
commit-bot@chromium.org | ce56d96 | 2014-05-05 18:39:18 +0000 | [diff] [blame] | 13 | // TODO: move this to private, as there is a public factory on SkShader |
| 14 | |
reed@google.com | 37a2012 | 2011-07-05 18:54:12 +0000 | [diff] [blame] | 15 | /** |
| 16 | * \class SkEmptyShader |
halcanary | 96fcdcc | 2015-08-27 07:41:13 -0700 | [diff] [blame] | 17 | * A Shader that always draws nothing. Its createContext always returns nullptr. |
reed@google.com | 37a2012 | 2011-07-05 18:54:12 +0000 | [diff] [blame] | 18 | */ |
Florin Malita | 95c993c | 2017-05-26 09:44:10 -0400 | [diff] [blame] | 19 | class SkEmptyShader : public SkShaderBase { |
reed@google.com | 37a2012 | 2011-07-05 18:54:12 +0000 | [diff] [blame] | 20 | public: |
reed@google.com | 59ccef6 | 2011-12-07 14:59:50 +0000 | [diff] [blame] | 21 | SkEmptyShader() {} |
reed@google.com | 37a2012 | 2011-07-05 18:54:12 +0000 | [diff] [blame] | 22 | |
reed@google.com | 37a2012 | 2011-07-05 18:54:12 +0000 | [diff] [blame] | 23 | protected: |
Mike Reed | e92aae6 | 2018-10-17 10:21:51 -0400 | [diff] [blame] | 24 | #ifdef SK_ENABLE_LEGACY_SHADERCONTEXT |
Florin Malita | 4aed138 | 2017-05-25 10:38:07 -0400 | [diff] [blame] | 25 | Context* onMakeContext(const ContextRec&, SkArenaAlloc*) const override { |
halcanary | 96fcdcc | 2015-08-27 07:41:13 -0700 | [diff] [blame] | 26 | return nullptr; |
commit-bot@chromium.org | ce56d96 | 2014-05-05 18:39:18 +0000 | [diff] [blame] | 27 | } |
Mike Reed | e92aae6 | 2018-10-17 10:21:51 -0400 | [diff] [blame] | 28 | #endif |
commit-bot@chromium.org | ce56d96 | 2014-05-05 18:39:18 +0000 | [diff] [blame] | 29 | |
mtklein | 6ef68ab | 2015-04-16 07:59:12 -0700 | [diff] [blame] | 30 | void flatten(SkWriteBuffer& buffer) const override { |
| 31 | // Do nothing. |
| 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. |
| 34 | } |
| 35 | |
Mike Reed | 1386b2d | 2019-03-13 21:15:05 -0400 | [diff] [blame] | 36 | bool onAppendStages(const SkStageRec&) const override { |
Mike Reed | 6867eee | 2017-06-02 13:25:15 -0400 | [diff] [blame] | 37 | return false; |
| 38 | } |
| 39 | |
reed@google.com | 37a2012 | 2011-07-05 18:54:12 +0000 | [diff] [blame] | 40 | private: |
Mike Klein | 4fee323 | 2018-10-18 17:27:16 -0400 | [diff] [blame] | 41 | SK_FLATTENABLE_HOOKS(SkEmptyShader) |
| 42 | |
Florin Malita | 4aed138 | 2017-05-25 10:38:07 -0400 | [diff] [blame] | 43 | typedef SkShaderBase INHERITED; |
reed@google.com | 37a2012 | 2011-07-05 18:54:12 +0000 | [diff] [blame] | 44 | }; |
| 45 | |
| 46 | #endif |