1/* 2Copyright (C) 2012 Google Inc. All rights reserved. 3 4Redistribution and use in source and binary forms, with or without 5modification, are permitted provided that the following conditions 6are met: 71. Redistributions of source code must retain the above copyright 8 notice, this list of conditions and the following disclaimer. 92. 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 13THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY 14EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 15WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 16DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY 17DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 18(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 19LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON 20ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 21(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 22SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 23*/ 24 25#ifndef Canvas2DLayerManager_h 26#define Canvas2DLayerManager_h 27 28#include "platform/graphics/Canvas2DLayerBridge.h" 29#include "public/platform/WebThread.h" 30 31class Canvas2DLayerManagerTest; 32 33namespace blink { 34 35class PLATFORM_EXPORT Canvas2DLayerManager : public WebThread::TaskObserver { 36public: 37 static Canvas2DLayerManager& get(); 38 39 void init(size_t maxBytesAllocated, size_t targetBytesAllocated); 40 virtual ~Canvas2DLayerManager(); 41 42 void layerTransientResourceAllocationChanged(Canvas2DLayerBridge*, intptr_t deltaBytes = 0); 43 void layerDidDraw(Canvas2DLayerBridge*); 44 45 bool isInList(Canvas2DLayerBridge*) const; 46private: 47 Canvas2DLayerManager(); 48 49 // internal methods 50 void freeMemoryIfNecessary(); 51 void addLayerToList(Canvas2DLayerBridge*); 52 virtual void willProcessTask() OVERRIDE; 53 virtual void didProcessTask() OVERRIDE; 54 55 size_t m_bytesAllocated; 56 size_t m_maxBytesAllocated; 57 size_t m_targetBytesAllocated; 58 bool m_taskObserverActive; 59 DoublyLinkedList<Canvas2DLayerBridge> m_layerList; 60 61 friend class ::Canvas2DLayerManagerTest; // for unit testing 62}; 63 64} // namespace blink 65 66#endif 67 68