1 /* 2 * Copyright (C) 2013 Google Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #ifndef DiscardablePixelRef_h 27 #define DiscardablePixelRef_h 28 29 #include "SkBitmap.h" 30 #include "SkPixelRef.h" 31 32 #include "platform/PlatformExport.h" 33 #include "public/platform/WebDiscardableMemory.h" 34 #include "wtf/OwnPtr.h" 35 #include "wtf/PassOwnPtr.h" 36 37 namespace WebCore { 38 39 // Class for allocating the DiscardablePixelRef object. 40 class PLATFORM_EXPORT DiscardablePixelRefAllocator : public SkBitmap::Allocator { 41 // SkBitmap::Allocator implementation. The discardable memory allocated 42 // after this call is locked and will not be purged until next 43 // onUnlockPixels(). 44 virtual bool allocPixelRef(SkBitmap*, SkColorTable*) OVERRIDE; 45 }; 46 47 // PixelRef object whose memory can be discarded when pixels are unlocked. 48 class PLATFORM_EXPORT DiscardablePixelRef : public SkPixelRef { 49 public: 50 DiscardablePixelRef(const SkImageInfo&, size_t rowBytes, PassOwnPtr<SkMutex>); 51 virtual ~DiscardablePixelRef(); 52 53 static bool isDiscardable(SkPixelRef*); 54 bool allocAndLockDiscardableMemory(size_t); 55 56 SK_DECLARE_UNFLATTENABLE_OBJECT() 57 58 protected: 59 // SkPixelRef implementation. 60 virtual bool onNewLockPixels(LockRec*) OVERRIDE; 61 virtual void onUnlockPixels() OVERRIDE; 62 63 private: 64 void* m_lockedMemory; 65 OwnPtr<blink::WebDiscardableMemory> m_discardable; 66 OwnPtr<SkMutex> m_mutex; 67 size_t m_rowBytes; 68 }; 69 70 } // namespace WebCore 71 72 #endif 73