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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 "SkPixelRef.h" | |
13 #include "SkImageGenerator.h" | 12 #include "SkImageGenerator.h" |
14 #include "SkImageInfo.h" | 13 #include "SkImageInfo.h" |
15 | 14 #include "SkPixelRef.h" |
16 /** | |
17 * An interface that allows a purgable PixelRef to re-decode an image. | |
18 */ | |
19 | |
20 typedef SkDiscardableMemory* (*SkDiscardableMemoryFactory)(size_t bytes); | |
21 | |
22 | 15 |
23 class SkDiscardablePixelRef : public SkPixelRef { | 16 class SkDiscardablePixelRef : public SkPixelRef { |
24 public: | 17 public: |
25 /** | |
26 * Takes ownership of SkImageGenerator. If this method fails for | |
27 * whatever reason, it will return false and immediatetely delete | |
28 * the generator. If it succeeds, it will modify destination | |
29 * bitmap. | |
30 * | |
31 * If Install fails or when the SkDiscardablePixelRef that is | |
32 * installed into destination is destroyed, it will call | |
33 * SkDELETE() on the generator. Therefore, generator should be | |
34 * allocated with SkNEW() or SkNEW_ARGS(). | |
35 * | |
36 * @param destination Upon success, this bitmap will be | |
37 * configured and have a pixelref installed. | |
38 * | |
39 * @param factory If not NULL, this object will be used as a | |
40 * source of discardable memory when decoding. If NULL, then | |
41 * SkDiscardableMemory::Create() will be called. | |
42 * | |
43 * @return true iff successful. | |
44 */ | |
45 static bool Install(SkImageGenerator* generator, | |
46 SkBitmap* destination, | |
47 SkDiscardableMemory::Factory* factory = NULL); | |
48 | |
49 SK_DECLARE_UNFLATTENABLE_OBJECT() | 18 SK_DECLARE_UNFLATTENABLE_OBJECT() |
50 | 19 |
51 protected: | 20 protected: |
52 ~SkDiscardablePixelRef(); | 21 ~SkDiscardablePixelRef(); |
53 virtual void* onLockPixels(SkColorTable**) SK_OVERRIDE; | 22 virtual void* onLockPixels(SkColorTable**) SK_OVERRIDE; |
54 virtual void onUnlockPixels() SK_OVERRIDE; | 23 virtual void onUnlockPixels() SK_OVERRIDE; |
55 virtual bool onLockPixelsAreWritable() const SK_OVERRIDE { return false; } | 24 virtual bool onLockPixelsAreWritable() const SK_OVERRIDE { return false; } |
56 | 25 |
57 virtual SkData* onRefEncodedData() SK_OVERRIDE { | 26 virtual SkData* onRefEncodedData() SK_OVERRIDE { |
58 return fGenerator->refEncodedData(); | 27 return fGenerator->refEncodedData(); |
59 } | 28 } |
60 | 29 |
61 private: | 30 private: |
62 SkImageGenerator* const fGenerator; | 31 SkImageGenerator* const fGenerator; |
63 SkDiscardableMemory::Factory* const fDMFactory; | 32 SkDiscardableMemory::Factory* const fDMFactory; |
64 const SkImageInfo fInfo; | 33 const SkImageInfo fInfo; |
65 const size_t fSize; // size of memory to be allocated | 34 const size_t fSize; // size of memory to be allocated |
66 const size_t fRowBytes; | 35 const size_t fRowBytes; |
67 // These const members should not change over the life of the | 36 // These const members should not change over the life of the |
68 // PixelRef, since the SkBitmap doesn't expect them to change. | 37 // PixelRef, since the SkBitmap doesn't expect them to change. |
69 | 38 |
70 SkDiscardableMemory* fDiscardableMemory; | 39 SkDiscardableMemory* fDiscardableMemory; |
71 | 40 |
72 /* Takes ownership of SkImageGenerator. */ | 41 /* Takes ownership of SkImageGenerator. */ |
73 SkDiscardablePixelRef(SkImageGenerator* generator, | 42 SkDiscardablePixelRef(SkImageGenerator* generator, |
74 const SkImageInfo& info, | 43 const SkImageInfo& info, |
75 size_t size, | 44 size_t size, |
76 size_t rowBytes, | 45 size_t rowBytes, |
77 SkDiscardableMemory::Factory* factory); | 46 SkDiscardableMemory::Factory* factory); |
| 47 friend bool SkInstallDiscardablePixelRef(SkImageGenerator*, |
| 48 SkBitmap*, |
| 49 SkDiscardableMemory::Factory*); |
| 50 typedef SkPixelRef INHERITED; |
78 }; | 51 }; |
79 #endif // SkDiscardablePixelRef_DEFINED | 52 #endif // SkDiscardablePixelRef_DEFINED |
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