1/* 2 * Copyright (C) 2012, 2014 Apple 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 INC. AND ITS CONTRIBUTORS ``AS IS'' 14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS 17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 23 * THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26#ifndef LayerPool_h 27#define LayerPool_h 28 29#include "IntSize.h" 30#include "IntSizeHash.h" 31#include "PlatformCALayer.h" 32#include "Timer.h" 33#include <wtf/Deque.h> 34#include <wtf/HashMap.h> 35#include <wtf/OwnPtr.h> 36#include <wtf/RetainPtr.h> 37#include <wtf/Vector.h> 38 39namespace WebCore { 40 41class LayerPool { 42 WTF_MAKE_NONCOPYABLE(LayerPool); 43public: 44 LayerPool(); 45 ~LayerPool(); 46 47 static HashSet<LayerPool*>& allLayerPools(); 48 49 void addLayer(const RefPtr<PlatformCALayer>&); 50 RefPtr<PlatformCALayer> takeLayerWithSize(const IntSize&); 51 52 void drain(); 53 54 // The maximum size of all queued layers in bytes. 55 unsigned capacity() const { return m_maxBytesForPool; } 56 57private: 58 typedef Deque<RefPtr<PlatformCALayer>> LayerList; 59 60 unsigned decayedCapacity() const; 61 62 bool canReuseLayerWithSize(const IntSize& size) const { return m_maxBytesForPool && !size.isEmpty(); } 63 void schedulePrune(); 64 void pruneTimerFired(Timer<LayerPool>&); 65 66 typedef enum { LeaveUnchanged, MarkAsUsed } AccessType; 67 LayerList& listOfLayersWithSize(const IntSize&, AccessType = LeaveUnchanged); 68 69 static unsigned backingStoreBytesForSize(const IntSize&); 70 71 HashMap<IntSize, LayerList> m_reuseLists; 72 // Ordered by recent use. The last size is the most recently used. 73 Vector<IntSize> m_sizesInPruneOrder; 74 unsigned m_totalBytes; 75 unsigned m_maxBytesForPool; 76 77 Timer<LayerPool> m_pruneTimer; 78 79 double m_lastAddTime; 80}; 81 82} 83 84#endif 85