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 "SkImageGeneratorPriv.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 diagnostic_only_getDiscardable()24 SkDiscardableMemory* diagnostic_only_getDiscardable() const override { 25 return fDiscardableMemory; 26 } 27 28 protected: 29 ~SkDiscardablePixelRef(); 30 31 bool onNewLockPixels(LockRec*) override; 32 void onUnlockPixels() override; onLockPixelsAreWritable()33 bool onLockPixelsAreWritable() const override { return false; } 34 onRefEncodedData()35 SkData* onRefEncodedData() override { 36 return fGenerator->refEncodedData(); 37 } 38 onIsLazyGenerated()39 bool onIsLazyGenerated() const override { return true; } 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 bool fDiscardableMemoryIsLocked; 50 SkAutoTUnref<SkColorTable> fCTable; 51 52 /* Takes ownership of SkImageGenerator. */ 53 SkDiscardablePixelRef(const SkImageInfo&, SkImageGenerator*, 54 size_t rowBytes, 55 SkDiscardableMemory::Factory* factory); 56 onGetYUV8Planes(SkISize sizes[3],void * planes[3],size_t rowBytes[3],SkYUVColorSpace * colorSpace)57 bool onGetYUV8Planes(SkISize sizes[3], 58 void* planes[3], 59 size_t rowBytes[3], 60 SkYUVColorSpace* colorSpace) override { 61 // If the image was already decoded with lockPixels(), favor not 62 // re-decoding to YUV8 planes. 63 if (fDiscardableMemory) { 64 return false; 65 } 66 return fGenerator->getYUV8Planes(sizes, planes, rowBytes, colorSpace); 67 } 68 69 friend bool SkDEPRECATED_InstallDiscardablePixelRef(SkImageGenerator*, const SkIRect*, SkBitmap*, 70 SkDiscardableMemory::Factory*); 71 72 typedef SkPixelRef INHERITED; 73 }; 74 75 #endif // SkDiscardablePixelRef_DEFINED 76