1/* 2 * Copyright (C) 2010 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 COMPUTER, 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#if USE(REQUEST_ANIMATION_FRAME_DISPLAY_MONITOR) 29 30#include "DisplayRefreshMonitor.h" 31 32#include <QuartzCore/QuartzCore.h> 33#include <wtf/CurrentTime.h> 34#include <wtf/MainThread.h> 35 36namespace WebCore { 37 38static CVReturn displayLinkCallback(CVDisplayLinkRef, const CVTimeStamp* now, const CVTimeStamp* outputTime, CVOptionFlags, CVOptionFlags*, void* data) 39{ 40 DisplayRefreshMonitor* monitor = static_cast<DisplayRefreshMonitor*>(data); 41 42 double nowSeconds = static_cast<double>(now->videoTime) / static_cast<double>(now->videoTimeScale); 43 double outputTimeSeconds = static_cast<double>(outputTime->videoTime) / static_cast<double>(outputTime->videoTimeScale); 44 monitor->displayLinkFired(nowSeconds, outputTimeSeconds); 45 46 return kCVReturnSuccess; 47} 48 49DisplayRefreshMonitor::~DisplayRefreshMonitor() 50{ 51 if (m_displayLink) { 52 CVDisplayLinkStop(m_displayLink); 53 CVDisplayLinkRelease(m_displayLink); 54 m_displayLink = 0; 55 } 56 57 cancelCallOnMainThread(DisplayRefreshMonitor::handleDisplayRefreshedNotificationOnMainThread, this); 58} 59 60bool DisplayRefreshMonitor::requestRefreshCallback() 61{ 62 if (!m_active) 63 return false; 64 65 if (!m_displayLink) { 66 m_active = false; 67 CVReturn error = CVDisplayLinkCreateWithCGDisplay(m_displayID, &m_displayLink); 68 if (error) 69 return false; 70 71 error = CVDisplayLinkSetOutputCallback(m_displayLink, displayLinkCallback, this); 72 if (error) 73 return false; 74 75 error = CVDisplayLinkStart(m_displayLink); 76 if (error) 77 return false; 78 79 m_active = true; 80 } 81 82 MutexLocker lock(m_mutex); 83 m_scheduled = true; 84 return true; 85} 86 87void DisplayRefreshMonitor::displayLinkFired(double nowSeconds, double outputTimeSeconds) 88{ 89 MutexLocker lock(m_mutex); 90 if (!m_previousFrameDone) 91 return; 92 93 m_previousFrameDone = false; 94 95 double webKitMonotonicNow = monotonicallyIncreasingTime(); 96 double timeUntilOutput = outputTimeSeconds - nowSeconds; 97 // FIXME: Should this be using webKitMonotonicNow? 98 m_monotonicAnimationStartTime = webKitMonotonicNow + timeUntilOutput; 99 100 callOnMainThread(handleDisplayRefreshedNotificationOnMainThread, this); 101} 102 103} 104 105#endif // USE(REQUEST_ANIMATION_FRAME_DISPLAY_MONITOR) 106