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1 /* | 1 /* |
2 * Copyright 2013 Google Inc. | 2 * Copyright 2013 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 SkDiscardablePixelRef_DEFINED | 8 #ifndef SkDiscardablePixelRef_DEFINED |
9 #define SkDiscardablePixelRef_DEFINED | 9 #define SkDiscardablePixelRef_DEFINED |
10 | 10 |
11 #include "SkDiscardableMemory.h" | 11 #include "SkDiscardableMemory.h" |
12 #include "SkImageGenerator.h" | 12 #include "SkImageGenerator.h" |
13 #include "SkImageInfo.h" | 13 #include "SkImageInfo.h" |
14 #include "SkPixelRef.h" | 14 #include "SkPixelRef.h" |
15 | 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 */ |
16 class SkDiscardablePixelRef : public SkPixelRef { | 25 class SkDiscardablePixelRef : public SkPixelRef { |
17 public: | 26 public: |
18 SK_DECLARE_UNFLATTENABLE_OBJECT() | 27 SK_DECLARE_UNFLATTENABLE_OBJECT() |
19 | 28 |
20 protected: | 29 protected: |
21 ~SkDiscardablePixelRef(); | 30 ~SkDiscardablePixelRef(); |
22 virtual void* onLockPixels(SkColorTable**) SK_OVERRIDE; | 31 virtual void* onLockPixels(SkColorTable**) SK_OVERRIDE; |
23 virtual void onUnlockPixels() SK_OVERRIDE; | 32 virtual void onUnlockPixels() SK_OVERRIDE; |
24 virtual bool onLockPixelsAreWritable() const SK_OVERRIDE { return false; } | 33 virtual bool onLockPixelsAreWritable() const SK_OVERRIDE { return false; } |
25 | 34 |
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39 /* Takes ownership of SkImageGenerator. */ | 48 /* Takes ownership of SkImageGenerator. */ |
40 SkDiscardablePixelRef(const SkImageInfo&, SkImageGenerator*, | 49 SkDiscardablePixelRef(const SkImageInfo&, SkImageGenerator*, |
41 size_t rowBytes, | 50 size_t rowBytes, |
42 SkDiscardableMemory::Factory* factory); | 51 SkDiscardableMemory::Factory* factory); |
43 friend bool SkInstallDiscardablePixelRef(SkImageGenerator*, | 52 friend bool SkInstallDiscardablePixelRef(SkImageGenerator*, |
44 SkBitmap*, | 53 SkBitmap*, |
45 SkDiscardableMemory::Factory*); | 54 SkDiscardableMemory::Factory*); |
46 typedef SkPixelRef INHERITED; | 55 typedef SkPixelRef INHERITED; |
47 }; | 56 }; |
48 #endif // SkDiscardablePixelRef_DEFINED | 57 #endif // SkDiscardablePixelRef_DEFINED |
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