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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 14 matching lines...) Expand all Loading... |
| 25 * scope. | 25 * scope. |
| 26 */ | 26 */ |
| 27 virtual SkCanvas* onNewCanvas() = 0; | 27 virtual SkCanvas* onNewCanvas() = 0; |
| 28 | 28 |
| 29 virtual SkSurface* onNewSurface(const SkImageInfo&) = 0; | 29 virtual SkSurface* onNewSurface(const SkImageInfo&) = 0; |
| 30 | 30 |
| 31 /** | 31 /** |
| 32 * Allocate an SkImage that represents the current contents of the surface. | 32 * Allocate an SkImage that represents the current contents of the surface. |
| 33 * This needs to be able to outlive the surface itself (if need be), and | 33 * This needs to be able to outlive the surface itself (if need be), and |
| 34 * must faithfully represent the current contents, even if the surface | 34 * must faithfully represent the current contents, even if the surface |
| 35 * is chaged after this calle (e.g. it is drawn to via its canvas). | 35 * is changed after this called (e.g. it is drawn to via its canvas). |
| 36 */ | 36 */ |
| 37 virtual SkImage* onNewImageSnapshot() = 0; | 37 virtual SkImage* onNewImageSnapshot(Budgeted) = 0; |
| 38 | 38 |
| 39 /** | 39 /** |
| 40 * Default implementation: | 40 * Default implementation: |
| 41 * | 41 * |
| 42 * image = this->newImageSnapshot(); | 42 * image = this->newImageSnapshot(); |
| 43 * if (image) { | 43 * if (image) { |
| 44 * image->draw(canvas, ...); | 44 * image->draw(canvas, ...); |
| 45 * image->unref(); | 45 * image->unref(); |
| 46 * } | 46 * } |
| 47 */ | 47 */ |
| 48 virtual void onDraw(SkCanvas*, SkScalar x, SkScalar y, const SkPaint*); | 48 virtual void onDraw(SkCanvas*, SkScalar x, SkScalar y, const SkPaint*); |
| 49 | 49 |
| 50 /** | 50 /** |
| 51 * Called as a performance hint when the Surface is allowed to make it's con
tents | 51 * Called as a performance hint when the Surface is allowed to make it's con
tents |
| 52 * undefined. | 52 * undefined. |
| 53 */ | 53 */ |
| 54 virtual void onDiscard() {} | 54 virtual void onDiscard() {} |
| 55 | 55 |
| 56 /** | 56 /** |
| 57 * If the surface is about to change, we call this so that our subclass | 57 * If the surface is about to change, we call this so that our subclass |
| 58 * can optionally fork their backend (copy-on-write) in case it was | 58 * can optionally fork their backend (copy-on-write) in case it was |
| 59 * being shared with the cachedImage. | 59 * being shared with the cachedImage. |
| 60 */ | 60 */ |
| 61 virtual void onCopyOnWrite(ContentChangeMode) = 0; | 61 virtual void onCopyOnWrite(ContentChangeMode) = 0; |
| 62 | 62 |
| 63 inline SkCanvas* getCachedCanvas(); | 63 inline SkCanvas* getCachedCanvas(); |
| 64 inline SkImage* getCachedImage(); | 64 inline SkImage* getCachedImage(Budgeted); |
| 65 | 65 |
| 66 // called by SkSurface to compute a new genID | 66 // called by SkSurface to compute a new genID |
| 67 uint32_t newGenerationID(); | 67 uint32_t newGenerationID(); |
| 68 | 68 |
| 69 private: | 69 private: |
| 70 SkCanvas* fCachedCanvas; | 70 SkCanvas* fCachedCanvas; |
| 71 SkImage* fCachedImage; | 71 SkImage* fCachedImage; |
| 72 | 72 |
| 73 void aboutToDraw(ContentChangeMode mode); | 73 void aboutToDraw(ContentChangeMode mode); |
| 74 friend class SkCanvas; | 74 friend class SkCanvas; |
| 75 friend class SkSurface; | 75 friend class SkSurface; |
| 76 | 76 |
| 77 typedef SkSurface INHERITED; | 77 typedef SkSurface INHERITED; |
| 78 }; | 78 }; |
| 79 | 79 |
| 80 SkCanvas* SkSurface_Base::getCachedCanvas() { | 80 SkCanvas* SkSurface_Base::getCachedCanvas() { |
| 81 if (NULL == fCachedCanvas) { | 81 if (NULL == fCachedCanvas) { |
| 82 fCachedCanvas = this->onNewCanvas(); | 82 fCachedCanvas = this->onNewCanvas(); |
| 83 if (fCachedCanvas) { | 83 if (fCachedCanvas) { |
| 84 fCachedCanvas->setSurfaceBase(this); | 84 fCachedCanvas->setSurfaceBase(this); |
| 85 } | 85 } |
| 86 } | 86 } |
| 87 return fCachedCanvas; | 87 return fCachedCanvas; |
| 88 } | 88 } |
| 89 | 89 |
| 90 SkImage* SkSurface_Base::getCachedImage() { | 90 SkImage* SkSurface_Base::getCachedImage(Budgeted budgeted) { |
| 91 if (NULL == fCachedImage) { | 91 if (NULL == fCachedImage) { |
| 92 fCachedImage = this->onNewImageSnapshot(); | 92 fCachedImage = this->onNewImageSnapshot(budgeted); |
| 93 SkASSERT(!fCachedCanvas || fCachedCanvas->getSurfaceBase() == this); | 93 SkASSERT(!fCachedCanvas || fCachedCanvas->getSurfaceBase() == this); |
| 94 } | 94 } |
| 95 return fCachedImage; | 95 return fCachedImage; |
| 96 } | 96 } |
| 97 | 97 |
| 98 #endif | 98 #endif |
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