1/* 2 * Copyright (C) 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. ``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 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 RemoteLayerBackingStoreCollection_h 27#define RemoteLayerBackingStoreCollection_h 28 29#import <WebCore/Timer.h> 30#import <wtf/HashSet.h> 31#import <wtf/Noncopyable.h> 32 33namespace WebKit { 34 35class RemoteLayerBackingStore; 36class RemoteLayerTreeContext; 37class RemoteLayerTreeTransaction; 38 39class RemoteLayerBackingStoreCollection { 40 WTF_MAKE_NONCOPYABLE(RemoteLayerBackingStoreCollection); 41 WTF_MAKE_FAST_ALLOCATED; 42public: 43 RemoteLayerBackingStoreCollection(); 44 45 void backingStoreWasCreated(RemoteLayerBackingStore&); 46 void backingStoreWillBeDestroyed(RemoteLayerBackingStore&); 47 48 void backingStoreWillBeDisplayed(RemoteLayerBackingStore&); 49 void backingStoreBecameUnreachable(RemoteLayerBackingStore&); 50 51 void willFlushLayers(); 52 void willCommitLayerTree(RemoteLayerTreeTransaction&); 53 void didFlushLayers(); 54 55 void volatilityTimerFired(WebCore::Timer<RemoteLayerBackingStoreCollection>&); 56 bool markAllBackingStoreVolatileImmediatelyIfPossible(); 57 58 void scheduleVolatilityTimer(); 59 60private: 61 enum VolatilityMarkingFlag { 62 MarkBuffersIgnoringReachability = 1 << 0 63 }; 64 typedef unsigned VolatilityMarkingFlags; 65 bool markBackingStoreVolatileImmediately(RemoteLayerBackingStore&, VolatilityMarkingFlags volatilityMarkingFlags = 0); 66 bool markBackingStoreVolatile(RemoteLayerBackingStore&, std::chrono::steady_clock::time_point now); 67 68 HashSet<RemoteLayerBackingStore*> m_liveBackingStore; 69 HashSet<RemoteLayerBackingStore*> m_unparentedBackingStore; 70 HashSet<RemoteLayerBackingStore*> m_reachableBackingStoreInLatestFlush; 71 72 WebCore::Timer<RemoteLayerBackingStoreCollection> m_volatilityTimer; 73 74 bool m_inLayerFlush; 75}; 76 77} // namespace WebKit 78 79#endif // RemoteLayerBackingStoreCollection_h 80