/* * Copyright (C) 2011 Apple Inc. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include "config.h" #include "LayerFlushScheduler.h" #include <wtf/AutodrainedPool.h> #if PLATFORM(IOS) #include "RuntimeApplicationChecksIOS.h" #include <CoreFoundation/CFBundle.h> #include <WebCore/WebCoreThread.h> #endif namespace WebCore { static const CFIndex layerFlushRunLoopOrder = (CFIndex)RunLoopObserver::WellKnownRunLoopOrders::CoreAnimationCommit - 1; static CFRunLoopRef currentRunLoop() { #if PLATFORM(IOS) // A race condition during WebView deallocation can lead to a crash if the layer sync run loop // observer is added to the main run loop <rdar://problem/9798550>. However, for responsiveness, // we still allow this, see <rdar://problem/7403328>. Since the race condition and subsequent // crash are especially troublesome for iBooks, we never allow the observer to be added to the // main run loop in iBooks. if (applicationIsIBooksOnIOS()) return WebThreadRunLoop(); #endif return CFRunLoopGetCurrent(); } LayerFlushScheduler::LayerFlushScheduler(LayerFlushSchedulerClient* client) : m_isSuspended(false) , m_client(client) { ASSERT_ARG(client, client); m_runLoopObserver = RunLoopObserver::create(layerFlushRunLoopOrder, [this]() { if (this->isSuspended()) return; this->layerFlushCallback(); }); } LayerFlushScheduler::~LayerFlushScheduler() { } void LayerFlushScheduler::layerFlushCallback() { ASSERT(!m_isSuspended); AutodrainedPool pool; if (m_client->flushLayers()) invalidate(); } void LayerFlushScheduler::schedule() { if (m_isSuspended) return; m_runLoopObserver->schedule(currentRunLoop()); } void LayerFlushScheduler::invalidate() { m_runLoopObserver->invalidate(); } } // namespace WebCore