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1 /* | 1 /* |
2 * Copyright 2011 Google Inc. | 2 * Copyright 2011 Google Inc. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license that can be | 4 * Use of this source code is governed by a BSD-style license that can be |
5 * found in the LICENSE file. | 5 * found in the LICENSE file. |
6 */ | 6 */ |
7 | 7 |
8 #ifndef SkEmptyShader_DEFINED | 8 #ifndef SkEmptyShader_DEFINED |
9 #define SkEmptyShader_DEFINED | 9 #define SkEmptyShader_DEFINED |
10 | 10 |
11 #include "SkShader.h" | 11 #include "SkShader.h" |
12 | 12 |
13 // TODO: move this to private, as there is a public factory on SkShader | 13 // TODO: move this to private, as there is a public factory on SkShader |
14 | 14 |
15 /** | 15 /** |
16 * \class SkEmptyShader | 16 * \class SkEmptyShader |
17 * A Shader that always draws nothing. Its createContext always returns nullptr
. | 17 * A Shader that always draws nothing. Its createContext always returns nullptr
. |
18 */ | 18 */ |
19 class SK_API SkEmptyShader : public SkShader { | 19 class SK_API SkEmptyShader : public SkShader { |
20 public: | 20 public: |
21 SkEmptyShader() {} | 21 SkEmptyShader() {} |
22 | 22 |
23 size_t contextSize(const ContextRec&) const override { | |
24 // Even though createContext returns nullptr we have to return a value o
f at least | |
25 // sizeof(SkShader::Context) to satisfy SkSmallAllocator. | |
26 return sizeof(SkShader::Context); | |
27 } | |
28 | |
29 SK_TO_STRING_OVERRIDE() | 23 SK_TO_STRING_OVERRIDE() |
30 SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkEmptyShader) | 24 SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkEmptyShader) |
31 | 25 |
32 protected: | 26 protected: |
| 27 size_t onContextSize(const ContextRec&) const override { |
| 28 // Even though createContext returns nullptr we have to return a value o
f at least |
| 29 // sizeof(SkShader::Context) to satisfy SkSmallAllocator. |
| 30 return SkAlign16(sizeof(SkShader::Context)); |
| 31 } |
| 32 |
33 SkShader::Context* onCreateContext(const ContextRec&, void*) const override
{ | 33 SkShader::Context* onCreateContext(const ContextRec&, void*) const override
{ |
34 return nullptr; | 34 return nullptr; |
35 } | 35 } |
36 | 36 |
37 void flatten(SkWriteBuffer& buffer) const override { | 37 void flatten(SkWriteBuffer& buffer) const override { |
38 // Do nothing. | 38 // Do nothing. |
39 // We just don't want to fall through to SkShader::flatten(), | 39 // We just don't want to fall through to SkShader::flatten(), |
40 // which will write data we don't care to serialize or decode. | 40 // which will write data we don't care to serialize or decode. |
41 } | 41 } |
42 | 42 |
43 private: | 43 private: |
44 typedef SkShader INHERITED; | 44 typedef SkShader INHERITED; |
45 }; | 45 }; |
46 | 46 |
47 #endif | 47 #endif |
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