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comparison: gfx/skia/trunk/src/gpu/GrTemplates.h
gfx/skia/trunk/src/gpu/GrTemplates.h
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
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| -1:000000000000 | 0:2e78d5106fd9 |
|---|---|
| 1 /* | |
| 2 * Copyright 2010 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. | |
| 6 */ | |
| 7 | |
| 8 #ifndef GrTemplates_DEFINED | |
| 9 #define GrTemplates_DEFINED | |
| 10 | |
| 11 #include "SkTypes.h" | |
| 12 | |
| 13 /** | |
| 14 * Use to cast a ptr to a different type, and maintain strict-aliasing | |
| 15 */ | |
| 16 template <typename Dst, typename Src> Dst GrTCast(Src src) { | |
| 17 union { | |
| 18 Src src; | |
| 19 Dst dst; | |
| 20 } data; | |
| 21 data.src = src; | |
| 22 return data.dst; | |
| 23 } | |
| 24 | |
| 25 /** | |
| 26 * takes a T*, saves the value it points to, in and restores the value in the | |
| 27 * destructor | |
| 28 * e.g.: | |
| 29 * { | |
| 30 * GrAutoTRestore<int*> autoCountRestore; | |
| 31 * if (useExtra) { | |
| 32 * autoCountRestore.reset(&fCount); | |
| 33 * fCount += fExtraCount; | |
| 34 * } | |
| 35 * ... | |
| 36 * } // fCount is restored | |
| 37 */ | |
| 38 template <typename T> class GrAutoTRestore : public SkNoncopyable { | |
| 39 public: | |
| 40 GrAutoTRestore() : fPtr(NULL), fVal() {} | |
| 41 | |
| 42 GrAutoTRestore(T* ptr) { | |
| 43 fPtr = ptr; | |
| 44 if (NULL != ptr) { | |
| 45 fVal = *ptr; | |
| 46 } | |
| 47 } | |
| 48 | |
| 49 ~GrAutoTRestore() { | |
| 50 if (NULL != fPtr) { | |
| 51 *fPtr = fVal; | |
| 52 } | |
| 53 } | |
| 54 | |
| 55 // restores previously saved value (if any) and saves value for passed T* | |
| 56 void reset(T* ptr) { | |
| 57 if (NULL != fPtr) { | |
| 58 *fPtr = fVal; | |
| 59 } | |
| 60 fPtr = ptr; | |
| 61 fVal = *ptr; | |
| 62 } | |
| 63 private: | |
| 64 T* fPtr; | |
| 65 T fVal; | |
| 66 }; | |
| 67 | |
| 68 #endif |
