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1 /* | 1 /* |
2 * Copyright 2012 Google Inc. | 2 * Copyright 2012 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 SkSurface_Base_DEFINED | 8 #ifndef SkSurface_Base_DEFINED |
9 #define SkSurface_Base_DEFINED | 9 #define SkSurface_Base_DEFINED |
10 | 10 |
(...skipping 29 matching lines...) Expand all Loading... |
40 * | 40 * |
41 * image = this->newImageSnapshot(); | 41 * image = this->newImageSnapshot(); |
42 * if (image) { | 42 * if (image) { |
43 * image->draw(canvas, ...); | 43 * image->draw(canvas, ...); |
44 * image->unref(); | 44 * image->unref(); |
45 * } | 45 * } |
46 */ | 46 */ |
47 virtual void onDraw(SkCanvas*, SkScalar x, SkScalar y, const SkPaint*); | 47 virtual void onDraw(SkCanvas*, SkScalar x, SkScalar y, const SkPaint*); |
48 | 48 |
49 /** | 49 /** |
| 50 * Called as a performance hint when the Surface is allowed to make it's con
tents |
| 51 * undefined. |
| 52 */ |
| 53 virtual void onDiscard() {} |
| 54 |
| 55 /** |
50 * If the surface is about to change, we call this so that our subclass | 56 * If the surface is about to change, we call this so that our subclass |
51 * can optionally fork their backend (copy-on-write) in case it was | 57 * can optionally fork their backend (copy-on-write) in case it was |
52 * being shared with the cachedImage. | 58 * being shared with the cachedImage. |
53 */ | 59 */ |
54 virtual void onCopyOnWrite(ContentChangeMode) = 0; | 60 virtual void onCopyOnWrite(ContentChangeMode) = 0; |
55 | 61 |
56 inline SkCanvas* getCachedCanvas(); | 62 inline SkCanvas* getCachedCanvas(); |
57 inline SkImage* getCachedImage(); | 63 inline SkImage* getCachedImage(); |
58 | 64 |
59 // called by SkSurface to compute a new genID | 65 // called by SkSurface to compute a new genID |
60 uint32_t newGenerationID(); | 66 uint32_t newGenerationID(); |
61 | 67 |
62 private: | 68 private: |
63 SkCanvas* fCachedCanvas; | 69 SkCanvas* fCachedCanvas; |
64 SkImage* fCachedImage; | 70 SkImage* fCachedImage; |
65 | 71 |
66 void aboutToDraw(ContentChangeMode mode); | 72 void aboutToDraw(ContentChangeMode mode); |
67 friend class SkCanvas; | 73 friend class SkCanvas; |
68 friend class SkSurface; | 74 friend class SkSurface; |
69 | 75 |
70 inline void installIntoCanvasForDirtyNotification(); | |
71 | |
72 typedef SkSurface INHERITED; | 76 typedef SkSurface INHERITED; |
73 }; | 77 }; |
74 | 78 |
75 SkCanvas* SkSurface_Base::getCachedCanvas() { | 79 SkCanvas* SkSurface_Base::getCachedCanvas() { |
76 if (NULL == fCachedCanvas) { | 80 if (NULL == fCachedCanvas) { |
77 fCachedCanvas = this->onNewCanvas(); | 81 fCachedCanvas = this->onNewCanvas(); |
78 this->installIntoCanvasForDirtyNotification(); | 82 if (NULL != fCachedCanvas) { |
| 83 fCachedCanvas->setSurfaceBase(this); |
| 84 } |
79 } | 85 } |
80 return fCachedCanvas; | 86 return fCachedCanvas; |
81 } | 87 } |
82 | 88 |
83 SkImage* SkSurface_Base::getCachedImage() { | 89 SkImage* SkSurface_Base::getCachedImage() { |
84 if (NULL == fCachedImage) { | 90 if (NULL == fCachedImage) { |
85 fCachedImage = this->onNewImageSnapshot(); | 91 fCachedImage = this->onNewImageSnapshot(); |
86 this->installIntoCanvasForDirtyNotification(); | 92 SkASSERT(!fCachedCanvas || fCachedCanvas->getSurfaceBase() == this); |
87 } | 93 } |
88 return fCachedImage; | 94 return fCachedImage; |
89 } | 95 } |
90 | 96 |
91 void SkSurface_Base::installIntoCanvasForDirtyNotification() { | |
92 if (NULL != fCachedCanvas) { | |
93 fCachedCanvas->setSurfaceBase(this); | |
94 } | |
95 } | |
96 | |
97 #endif | 97 #endif |
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