1/* 2 * Copyright (C) 2011 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#include "config.h" 27 28#include "LayerFlushScheduler.h" 29 30#include <wtf/AutodrainedPool.h> 31 32#if PLATFORM(IOS) 33#include "RuntimeApplicationChecksIOS.h" 34#include <CoreFoundation/CFBundle.h> 35#include <WebCore/WebCoreThread.h> 36#endif 37 38namespace WebCore { 39 40static const CFIndex layerFlushRunLoopOrder = (CFIndex)RunLoopObserver::WellKnownRunLoopOrders::CoreAnimationCommit - 1; 41 42static CFRunLoopRef currentRunLoop() 43{ 44#if PLATFORM(IOS) 45 // A race condition during WebView deallocation can lead to a crash if the layer sync run loop 46 // observer is added to the main run loop <rdar://problem/9798550>. However, for responsiveness, 47 // we still allow this, see <rdar://problem/7403328>. Since the race condition and subsequent 48 // crash are especially troublesome for iBooks, we never allow the observer to be added to the 49 // main run loop in iBooks. 50 if (applicationIsIBooksOnIOS()) 51 return WebThreadRunLoop(); 52#endif 53 return CFRunLoopGetCurrent(); 54} 55 56LayerFlushScheduler::LayerFlushScheduler(LayerFlushSchedulerClient* client) 57 : m_isSuspended(false) 58 , m_client(client) 59{ 60 ASSERT_ARG(client, client); 61 62 m_runLoopObserver = RunLoopObserver::create(layerFlushRunLoopOrder, [this]() { 63 if (this->isSuspended()) 64 return; 65 this->layerFlushCallback(); 66 }); 67} 68 69LayerFlushScheduler::~LayerFlushScheduler() 70{ 71} 72 73void LayerFlushScheduler::layerFlushCallback() 74{ 75 ASSERT(!m_isSuspended); 76 77 AutodrainedPool pool; 78 if (m_client->flushLayers()) 79 invalidate(); 80} 81 82void LayerFlushScheduler::schedule() 83{ 84 if (m_isSuspended) 85 return; 86 87 m_runLoopObserver->schedule(currentRunLoop()); 88} 89 90void LayerFlushScheduler::invalidate() 91{ 92 m_runLoopObserver->invalidate(); 93} 94 95} // namespace WebCore 96