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| 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 "SkPixelRef.h" | |
| 12 #include "SkImageGenerator.h" | |
| 13 #include "SkImageInfo.h" | |
| 14 | |
| 15 class SkDiscardableMemory; | |
| 16 | |
| 17 /** | |
| 18 * An interface that allows a purgable PixelRef to re-decode an image. | |
| 19 */ | |
| 20 | |
| 21 class SkDiscardablePixelRef : public SkPixelRef { | |
| 22 public: | |
| 23 /** | |
| 24 * Takes ownership of SkImageGenerator. If this method fails for | |
| 25 * whatever reason, it will return false and immediatetely delete | |
| 26 * the generator. If it succeeds, it will modify destination | |
| 27 * bitmap. | |
| 28 * | |
| 29 * If Install fails or when the SkDiscardablePixelRef that is | |
| 30 * installed into destination is destroyed, it will call | |
| 31 * SkDELETE() on the generator. Therefore, generator should be | |
| 32 * allocated with SkNEW() or SkNEW_ARGS(). | |
| 33 */ | |
| 34 static bool Install(SkImageGenerator* generator, SkBitmap* destination); | |
| 35 | |
| 36 SK_DECLARE_UNFLATTENABLE_OBJECT() | |
| 37 | |
| 38 protected: | |
| 39 ~SkDiscardablePixelRef(); | |
| 40 virtual void* onLockPixels(SkColorTable**) SK_OVERRIDE; | |
| 41 virtual void onUnlockPixels() SK_OVERRIDE; | |
| 42 virtual bool onLockPixelsAreWritable() const SK_OVERRIDE { return false; } | |
| 43 | |
| 44 virtual SkData* onRefEncodedData() SK_OVERRIDE { | |
| 45 return fGenerator->refEncodedData(); | |
| 46 } | |
| 47 | |
| 48 private: | |
| 49 SkImageGenerator* const fGenerator; | |
| 50 const SkImageInfo fInfo; | |
| 51 const size_t fSize; // size of memory to be allocated | |
| 52 const size_t fRowBytes; | |
| 53 // These const members should not change over the life of the | |
| 54 // PixelRef, since the SkBitmap doesn't expect them to change. | |
| 55 | |
| 56 SkDiscardableMemory* fDiscardableMemory; | |
| 57 | |
| 58 /* Takes ownership of SkImageGenerator. */ | |
| 59 SkDiscardablePixelRef(SkImageGenerator* generator, | |
| 60 const SkImageInfo& info, | |
| 61 size_t size, | |
| 62 size_t rowBytes); | |
| 63 }; | |
| 64 #endif // SkDiscardablePixelRef_DEFINED | |
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Chromium Code Reviews
Issue 103033002:
Big Cleanup: SkBitmapFactory, SkLazyPixelRef, SkImageCache (Closed)
Base URL: https://skia.googlecode.com/svn/trunk