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 class SkDiscardablePixelRef : public SkPixelRef { 22 public: 23 SK_DECLARE_INST_COUNT(SkDiscardablePixelRef) 24 SK_DECLARE_UNFLATTENABLE_OBJECT() 25 26 protected: 27 ~SkDiscardablePixelRef(); 28 29 virtual bool onNewLockPixels(LockRec*) SK_OVERRIDE; 30 virtual void onUnlockPixels() SK_OVERRIDE; 31 virtual bool onLockPixelsAreWritable() const SK_OVERRIDE { return false; } 32 33 virtual SkData* onRefEncodedData() SK_OVERRIDE { 34 return fGenerator->refEncodedData(); 35 } 36 37 private: 38 SkImageGenerator* const fGenerator; 39 SkDiscardableMemory::Factory* const fDMFactory; 40 const size_t fRowBytes; 41 // These const members should not change over the life of the 42 // PixelRef, since the SkBitmap doesn't expect them to change. 43 44 SkDiscardableMemory* fDiscardableMemory; 45 SkAutoTUnref<SkColorTable> fCTable; 46 47 /* Takes ownership of SkImageGenerator. */ 48 SkDiscardablePixelRef(const SkImageInfo&, SkImageGenerator*, 49 size_t rowBytes, 50 SkDiscardableMemory::Factory* factory); 51 52 friend bool SkInstallDiscardablePixelRef(SkImageGenerator*, SkBitmap*, 53 SkDiscardableMemory::Factory*); 54 55 typedef SkPixelRef INHERITED; 56 }; 57 58 #endif // SkDiscardablePixelRef_DEFINED 59
