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comparison: gfx/skia/trunk/src/lazy/SkDiscardablePixelRef.h
gfx/skia/trunk/src/lazy/SkDiscardablePixelRef.h
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
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| -1:000000000000 | 0:eedc2e4f4e8a |
|---|---|
| 1 /* | |
| 2 * Copyright 2013 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 SkDiscardablePixelRef_DEFINED | |
| 9 #define SkDiscardablePixelRef_DEFINED | |
| 10 | |
| 11 #include "SkDiscardableMemory.h" | |
| 12 #include "SkImageGenerator.h" | |
| 13 #include "SkImageInfo.h" | |
| 14 #include "SkPixelRef.h" | |
| 15 | |
| 16 /** | |
| 17 * A PixelRef backed by SkDiscardableMemory, with the ability to | |
| 18 * re-generate the pixels (via a SkImageGenerator) if the DM is | |
| 19 * purged. | |
| 20 * | |
| 21 * Since SkColorTable is reference-counted, we do not support indexed | |
| 22 * color with this class; there would be no way for the discardable | |
| 23 * memory system to unref the color table. | |
| 24 */ | |
| 25 class SkDiscardablePixelRef : public SkPixelRef { | |
| 26 public: | |
| 27 SK_DECLARE_INST_COUNT(SkDiscardablePixelRef) | |
| 28 SK_DECLARE_UNFLATTENABLE_OBJECT() | |
| 29 | |
| 30 protected: | |
| 31 ~SkDiscardablePixelRef(); | |
| 32 | |
| 33 virtual bool onNewLockPixels(LockRec*) SK_OVERRIDE; | |
| 34 virtual void onUnlockPixels() SK_OVERRIDE; | |
| 35 virtual bool onLockPixelsAreWritable() const SK_OVERRIDE { return false; } | |
| 36 | |
| 37 virtual SkData* onRefEncodedData() SK_OVERRIDE { | |
| 38 return fGenerator->refEncodedData(); | |
| 39 } | |
| 40 | |
| 41 private: | |
| 42 SkImageGenerator* const fGenerator; | |
| 43 SkDiscardableMemory::Factory* const fDMFactory; | |
| 44 const size_t fRowBytes; | |
| 45 // These const members should not change over the life of the | |
| 46 // PixelRef, since the SkBitmap doesn't expect them to change. | |
| 47 | |
| 48 SkDiscardableMemory* fDiscardableMemory; | |
| 49 | |
| 50 /* Takes ownership of SkImageGenerator. */ | |
| 51 SkDiscardablePixelRef(const SkImageInfo&, SkImageGenerator*, | |
| 52 size_t rowBytes, | |
| 53 SkDiscardableMemory::Factory* factory); | |
| 54 | |
| 55 friend bool SkInstallDiscardablePixelRef(SkImageGenerator*, | |
| 56 SkBitmap*, | |
| 57 SkDiscardableMemory::Factory*); | |
| 58 | |
| 59 typedef SkPixelRef INHERITED; | |
| 60 }; | |
| 61 | |
| 62 #endif // SkDiscardablePixelRef_DEFINED |
