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comparison: gfx/skia/trunk/src/image/SkSurface_Base.h
gfx/skia/trunk/src/image/SkSurface_Base.h
- branch
- TOR_BUG_9701
- changeset 9
- a63d609f5ebe
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| -1:000000000000 | 0:2e0eab4a204a |
|---|---|
| 1 /* | |
| 2 * Copyright 2012 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 SkSurface_Base_DEFINED | |
| 9 #define SkSurface_Base_DEFINED | |
| 10 | |
| 11 #include "SkSurface.h" | |
| 12 #include "SkCanvas.h" | |
| 13 | |
| 14 class SkSurface_Base : public SkSurface { | |
| 15 public: | |
| 16 SkSurface_Base(int width, int height); | |
| 17 explicit SkSurface_Base(const SkImageInfo&); | |
| 18 virtual ~SkSurface_Base(); | |
| 19 | |
| 20 /** | |
| 21 * Allocate a canvas that will draw into this surface. We will cache this | |
| 22 * canvas, to return the same object to the caller multiple times. We | |
| 23 * take ownership, and will call unref() on the canvas when we go out of | |
| 24 * scope. | |
| 25 */ | |
| 26 virtual SkCanvas* onNewCanvas() = 0; | |
| 27 | |
| 28 virtual SkSurface* onNewSurface(const SkImageInfo&) = 0; | |
| 29 | |
| 30 /** | |
| 31 * Allocate an SkImage that represents the current contents of the surface. | |
| 32 * This needs to be able to outlive the surface itself (if need be), and | |
| 33 * must faithfully represent the current contents, even if the surface | |
| 34 * is chaged after this calle (e.g. it is drawn to via its canvas). | |
| 35 */ | |
| 36 virtual SkImage* onNewImageSnapshot() = 0; | |
| 37 | |
| 38 /** | |
| 39 * Default implementation: | |
| 40 * | |
| 41 * image = this->newImageSnapshot(); | |
| 42 * if (image) { | |
| 43 * image->draw(canvas, ...); | |
| 44 * image->unref(); | |
| 45 * } | |
| 46 */ | |
| 47 virtual void onDraw(SkCanvas*, SkScalar x, SkScalar y, const SkPaint*); | |
| 48 | |
| 49 /** | |
| 50 * 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 | |
| 52 * being shared with the cachedImage. | |
| 53 */ | |
| 54 virtual void onCopyOnWrite(ContentChangeMode) = 0; | |
| 55 | |
| 56 inline SkCanvas* getCachedCanvas(); | |
| 57 inline SkImage* getCachedImage(); | |
| 58 | |
| 59 // called by SkSurface to compute a new genID | |
| 60 uint32_t newGenerationID(); | |
| 61 | |
| 62 private: | |
| 63 SkCanvas* fCachedCanvas; | |
| 64 SkImage* fCachedImage; | |
| 65 | |
| 66 void aboutToDraw(ContentChangeMode mode); | |
| 67 friend class SkCanvas; | |
| 68 friend class SkSurface; | |
| 69 | |
| 70 inline void installIntoCanvasForDirtyNotification(); | |
| 71 | |
| 72 typedef SkSurface INHERITED; | |
| 73 }; | |
| 74 | |
| 75 SkCanvas* SkSurface_Base::getCachedCanvas() { | |
| 76 if (NULL == fCachedCanvas) { | |
| 77 fCachedCanvas = this->onNewCanvas(); | |
| 78 this->installIntoCanvasForDirtyNotification(); | |
| 79 } | |
| 80 return fCachedCanvas; | |
| 81 } | |
| 82 | |
| 83 SkImage* SkSurface_Base::getCachedImage() { | |
| 84 if (NULL == fCachedImage) { | |
| 85 fCachedImage = this->onNewImageSnapshot(); | |
| 86 this->installIntoCanvasForDirtyNotification(); | |
| 87 } | |
| 88 return fCachedImage; | |
| 89 } | |
| 90 | |
| 91 void SkSurface_Base::installIntoCanvasForDirtyNotification() { | |
| 92 if (NULL != fCachedCanvas) { | |
| 93 fCachedCanvas->setSurfaceBase(this); | |
| 94 } | |
| 95 } | |
| 96 | |
| 97 #endif |
