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1 /* | 1 /* |
2 * Copyright 2006 The Android Open Source Project | 2 * Copyright 2006 The Android Open Source Project |
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 SkFlattenable_DEFINED | 8 #ifndef SkFlattenable_DEFINED |
9 #define SkFlattenable_DEFINED | 9 #define SkFlattenable_DEFINED |
10 | 10 |
11 #include "SkRefCnt.h" | 11 #include "SkRefCnt.h" |
12 | 12 |
13 class SkReadBuffer; | 13 class SkReadBuffer; |
14 class SkWriteBuffer; | 14 class SkWriteBuffer; |
15 | 15 |
| 16 #define SK_SUPPORT_LEGACY_DEEPFLATTENING |
| 17 |
16 /* | 18 /* |
17 * Flattening is straight-forward: | 19 * Flattening is straight-forward: |
18 * 1. call getFactory() so we have a function-ptr to recreate the subclass | 20 * 1. call getFactory() so we have a function-ptr to recreate the subclass |
19 * 2. call flatten(buffer) to write out enough data for the factory to read | 21 * 2. call flatten(buffer) to write out enough data for the factory to read |
20 * | 22 * |
21 * Unflattening is easy for the caller: new_instance = factory(buffer) | 23 * Unflattening is easy for the caller: new_instance = factory(buffer) |
22 * | 24 * |
23 * The complexity of supporting this is as follows. | 25 * The complexity of supporting this is as follows. |
24 * | 26 * |
25 * If your subclass wants to control unflattening, use this macro in your decla
ration: | 27 * If your subclass wants to control unflattening, use this macro in your decla
ration: |
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36 | 38 |
37 #define SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_START(flattenable) \ | 39 #define SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_START(flattenable) \ |
38 void flattenable::InitializeFlattenables() { | 40 void flattenable::InitializeFlattenables() { |
39 | 41 |
40 #define SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END \ | 42 #define SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END \ |
41 } | 43 } |
42 | 44 |
43 #define SK_DECLARE_UNFLATTENABLE_OBJECT() \ | 45 #define SK_DECLARE_UNFLATTENABLE_OBJECT() \ |
44 virtual Factory getFactory() const SK_OVERRIDE { return NULL; } | 46 virtual Factory getFactory() const SK_OVERRIDE { return NULL; } |
45 | 47 |
| 48 #ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING |
| 49 #define SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(flattenable) \ |
| 50 SkFlattenable::Registrar(#flattenable, flattenable::DeepCreateProc, \ |
| 51 flattenable::GetFlattenableType()); |
| 52 |
| 53 #define SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(flattenable) \ |
| 54 private: \ |
| 55 static SkFlattenable* CreateProc(SkReadBuffer&); \ |
| 56 static SkFlattenable* DeepCreateProc(SkReadBuffer& buffer) { \ |
| 57 if (NeedsDeepUnflatten(buffer)) { \ |
| 58 return SkNEW_ARGS(flattenable, (buffer)); \ |
| 59 } \ |
| 60 return CreateProc(buffer); \ |
| 61 } \ |
| 62 friend class SkPrivateEffectInitializer; \ |
| 63 public: \ |
| 64 virtual Factory getFactory() const SK_OVERRIDE {return DeepCreateProc;} |
| 65 #else |
46 #define SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(flattenable) \ | 66 #define SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(flattenable) \ |
47 SkFlattenable::Registrar(#flattenable, flattenable::CreateProc, \ | 67 SkFlattenable::Registrar(#flattenable, flattenable::CreateProc, \ |
48 flattenable::GetFlattenableType()); | 68 flattenable::GetFlattenableType()); |
49 | 69 |
50 #define SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(flattenable) \ | 70 #define SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(flattenable) \ |
51 private: \ | 71 private: \ |
52 static SkFlattenable* CreateProc(SkReadBuffer&); \ | 72 static SkFlattenable* CreateProc(SkReadBuffer&); \ |
53 friend class SkPrivateEffectInitializer; \ | 73 friend class SkPrivateEffectInitializer; \ |
54 public: \ | 74 public: \ |
55 virtual Factory getFactory() const SK_OVERRIDE { return CreateProc; } | 75 virtual Factory getFactory() const SK_OVERRIDE { return CreateProc; } |
| 76 #endif |
56 | 77 |
57 // If your subclass will *never* need to be unflattened, declare this. | 78 // If your subclass will *never* need to be unflattened, declare this. |
58 #define SK_DECLARE_NOT_FLATTENABLE_PROCS(flattenable) \ | 79 #define SK_DECLARE_NOT_FLATTENABLE_PROCS(flattenable) \ |
59 virtual Factory getFactory() const SK_OVERRIDE { return ReturnNullCreateProc
; } | 80 virtual Factory getFactory() const SK_OVERRIDE { return ReturnNullCreateProc
; } |
60 | 81 |
61 /** For SkFlattenable derived objects with a valid type | 82 /** For SkFlattenable derived objects with a valid type |
62 This macro should only be used in base class objects in core | 83 This macro should only be used in base class objects in core |
63 */ | 84 */ |
64 #define SK_DEFINE_FLATTENABLE_TYPE(flattenable) \ | 85 #define SK_DEFINE_FLATTENABLE_TYPE(flattenable) \ |
65 static Type GetFlattenableType() { \ | 86 static Type GetFlattenableType() { \ |
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116 } | 137 } |
117 }; | 138 }; |
118 | 139 |
119 /** | 140 /** |
120 * Override this if your subclass needs to record data that it will need to
recreate itself | 141 * Override this if your subclass needs to record data that it will need to
recreate itself |
121 * from its CreateProc (returned by getFactory()). | 142 * from its CreateProc (returned by getFactory()). |
122 */ | 143 */ |
123 virtual void flatten(SkWriteBuffer&) const {} | 144 virtual void flatten(SkWriteBuffer&) const {} |
124 | 145 |
125 protected: | 146 protected: |
| 147 #ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING |
| 148 static bool NeedsDeepUnflatten(const SkReadBuffer&); |
| 149 SkFlattenable(SkReadBuffer&) {} |
| 150 #endif |
| 151 |
126 static SkFlattenable* ReturnNullCreateProc(SkReadBuffer&) { | 152 static SkFlattenable* ReturnNullCreateProc(SkReadBuffer&) { |
127 return NULL; | 153 return NULL; |
128 } | 154 } |
129 | 155 |
130 private: | 156 private: |
131 static void InitializeFlattenablesIfNeeded(); | 157 static void InitializeFlattenablesIfNeeded(); |
132 | 158 |
133 friend class SkGraphics; | 159 friend class SkGraphics; |
134 | 160 |
135 typedef SkRefCnt INHERITED; | 161 typedef SkRefCnt INHERITED; |
136 }; | 162 }; |
137 | 163 |
138 #endif | 164 #endif |
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