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Viewing changes to Source/WebCore/platform/graphics/DisplayRefreshMonitor.cpp

  • Committer: Package Import Robot
  • Author(s): Jonathan Riddell
  • Date: 2013-02-18 14:24:18 UTC
  • Revision ID: package-import@ubuntu.com-20130218142418-eon0jmjg3nj438uy
Tags: upstream-2.3
Import upstream version 2.3

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Source/WebCore/platform/graphics/DisplayRefreshMonitor.cpp
 
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/*
 
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 * Copyright (C) 2010 Apple Inc. All rights reserved.
 
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 *
 
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 * Redistribution and use in source and binary forms, with or without
 
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 * modification, are permitted provided that the following conditions
 
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 * are met:
 
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 * 1. Redistributions of source code must retain the above copyright
 
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 *    notice, this list of conditions and the following disclaimer.
 
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 * 2. Redistributions in binary form must reproduce the above copyright
 
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 *    notice, this list of conditions and the following disclaimer in the
 
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 *    documentation and/or other materials provided with the distribution.
 
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 *
 
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 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
 
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 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 
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 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
 
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 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 
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 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 
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 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 
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 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 
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 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 
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 */
 
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#include "config.h"
 
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#if USE(REQUEST_ANIMATION_FRAME_DISPLAY_MONITOR)
 
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#include "DisplayRefreshMonitor.h"
 
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#include <wtf/CurrentTime.h>
 
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namespace WebCore {
 
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DisplayRefreshMonitorClient::DisplayRefreshMonitorClient()
 
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    : m_scheduled(false)
 
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    , m_displayIDIsSet(false)
 
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{
 
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}
 
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DisplayRefreshMonitorClient::~DisplayRefreshMonitorClient()
 
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{
 
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    DisplayRefreshMonitorManager::sharedManager()->unregisterClient(this);
 
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}
 
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void DisplayRefreshMonitorClient::fireDisplayRefreshIfNeeded(double timestamp)
 
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{
 
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    if (m_scheduled) {
 
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        m_scheduled = false;
 
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        displayRefreshFired(timestamp);
 
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    }
 
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}
 
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DisplayRefreshMonitor::DisplayRefreshMonitor(PlatformDisplayID displayID)
 
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    : m_monotonicAnimationStartTime(0)
 
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    , m_active(true)
 
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    , m_scheduled(false)
 
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    , m_previousFrameDone(true)
 
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    , m_unscheduledFireCount(0)
 
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    , m_displayID(displayID)
 
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#if PLATFORM(MAC)
 
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    , m_displayLink(0)
 
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#endif
 
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#if PLATFORM(BLACKBERRY)
 
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    , m_animationClient(0)
 
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#endif
 
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{
 
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}
 
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void DisplayRefreshMonitor::handleDisplayRefreshedNotificationOnMainThread(void* data)
 
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{
 
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    DisplayRefreshMonitor* monitor = static_cast<DisplayRefreshMonitor*>(data);
 
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    monitor->displayDidRefresh();
 
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}
 
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void DisplayRefreshMonitor::addClient(DisplayRefreshMonitorClient* client)
 
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{
 
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    m_clients.add(client);
 
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}
 
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bool DisplayRefreshMonitor::removeClient(DisplayRefreshMonitorClient* client)
 
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{
 
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    DisplayRefreshMonitorClientSet::iterator it = m_clients.find(client);
 
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    if (it != m_clients.end()) {
 
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        m_clients.remove(it);
 
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        return true;
 
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    }
 
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    return false;
 
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}
 
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void DisplayRefreshMonitor::displayDidRefresh()
 
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{
 
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    double monotonicAnimationStartTime;
 
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    {
 
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        MutexLocker lock(m_mutex);
 
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         if (!m_scheduled)
 
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            ++m_unscheduledFireCount;
 
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        else
 
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            m_unscheduledFireCount = 0;
 
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        m_scheduled = false;
 
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        monotonicAnimationStartTime = m_monotonicAnimationStartTime;
 
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    }
 
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    // The call back can cause all our clients to be unregistered, so we need to protect
 
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    // against deletion until the end of the method.
 
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    RefPtr<DisplayRefreshMonitor> protector(this);
 
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    Vector<DisplayRefreshMonitorClient*> clients;
 
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    copyToVector(m_clients, clients);
 
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    for (size_t i = 0; i < clients.size(); ++i)
 
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        clients[i]->fireDisplayRefreshIfNeeded(monotonicAnimationStartTime);
 
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    {
 
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        MutexLocker lock(m_mutex);
 
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        m_previousFrameDone = true;
 
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    }
 
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    DisplayRefreshMonitorManager::sharedManager()->displayDidRefresh(this);
 
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}
 
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DisplayRefreshMonitorManager* DisplayRefreshMonitorManager::sharedManager()
 
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{
 
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    DEFINE_STATIC_LOCAL(DisplayRefreshMonitorManager, manager, ());
 
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    return &manager;
 
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}
 
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DisplayRefreshMonitor* DisplayRefreshMonitorManager::ensureMonitorForClient(DisplayRefreshMonitorClient* client)
 
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{
 
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    DisplayRefreshMonitorMap::iterator it = m_monitors.find(client->m_displayID);
 
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    if (it == m_monitors.end()) {
 
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        RefPtr<DisplayRefreshMonitor> monitor = DisplayRefreshMonitor::create(client->m_displayID);
 
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        monitor->addClient(client);
 
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        DisplayRefreshMonitor* result = monitor.get();
 
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        m_monitors.add(client->m_displayID, monitor.release());
 
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        return result;
 
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    }
 
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    it->value->addClient(client);
 
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    return it->value.get();
 
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}
 
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void DisplayRefreshMonitorManager::registerClient(DisplayRefreshMonitorClient* client)
 
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{
 
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    if (!client->m_displayIDIsSet)
 
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        return;
 
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    ensureMonitorForClient(client);
 
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}
 
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void DisplayRefreshMonitorManager::unregisterClient(DisplayRefreshMonitorClient* client)
 
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{
 
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    if (!client->m_displayIDIsSet)
 
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        return;
 
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    DisplayRefreshMonitorMap::iterator it = m_monitors.find(client->m_displayID);
 
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    if (it == m_monitors.end())
 
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        return;
 
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    DisplayRefreshMonitor* monitor = it->value.get();
 
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    if (monitor->removeClient(client)) {
 
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        if (!monitor->hasClients())
 
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            m_monitors.remove(it);
 
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    }
 
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}
 
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bool DisplayRefreshMonitorManager::scheduleAnimation(DisplayRefreshMonitorClient* client)
 
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{
 
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    if (!client->m_displayIDIsSet)
 
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        return false;
 
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    DisplayRefreshMonitor* monitor = ensureMonitorForClient(client);
 
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    client->m_scheduled = true;
 
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    return monitor->requestRefreshCallback();
 
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}
 
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void DisplayRefreshMonitorManager::displayDidRefresh(DisplayRefreshMonitor* monitor)
 
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{
 
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    if (monitor->shouldBeTerminated()) {
 
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        DisplayRefreshMonitorMap::iterator it = m_monitors.find(monitor->displayID());
 
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        ASSERT(it != m_monitors.end());
 
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        m_monitors.remove(it);
 
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    }
 
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}
 
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void DisplayRefreshMonitorManager::windowScreenDidChange(PlatformDisplayID displayID, DisplayRefreshMonitorClient* client)
 
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{
 
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    if (client->m_displayIDIsSet && client->m_displayID == displayID)
 
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        return;
 
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    unregisterClient(client);
 
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    client->setDisplayID(displayID);
 
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    registerClient(client);
 
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    if (client->m_scheduled)
 
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        scheduleAnimation(client);
 
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}
 
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}
 
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#endif // USE(REQUEST_ANIMATION_FRAME_DISPLAY_MONITOR)