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/*
* Copyright (C) 2010, 2014 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 "DisplayRefreshMonitor.h"
#if USE(REQUEST_ANIMATION_FRAME_DISPLAY_MONITOR)
#include "DisplayRefreshMonitorClient.h"
#include "DisplayRefreshMonitorIOS.h"
#include "DisplayRefreshMonitorMac.h"
#include "DisplayRefreshMonitorManager.h"
namespace WebCore {
PassRefPtr<DisplayRefreshMonitor> DisplayRefreshMonitor::create(DisplayRefreshMonitorClient* client)
{
PlatformDisplayID displayID = client->displayID();
if (RefPtr<DisplayRefreshMonitor> monitor = client->createDisplayRefreshMonitor(displayID))
return monitor.release();
#if PLATFORM(MAC)
return DisplayRefreshMonitorMac::create(displayID);
#endif
#if PLATFORM(IOS)
return DisplayRefreshMonitorIOS::create(displayID);
#endif
}
DisplayRefreshMonitor::DisplayRefreshMonitor(PlatformDisplayID displayID)
: m_monotonicAnimationStartTime(0)
, m_active(true)
, m_scheduled(false)
, m_previousFrameDone(true)
, m_unscheduledFireCount(0)
, m_displayID(displayID)
, m_clientsToBeNotified(nullptr)
{
}
DisplayRefreshMonitor::~DisplayRefreshMonitor()
{
}
void DisplayRefreshMonitor::handleDisplayRefreshedNotificationOnMainThread(void* data)
{
DisplayRefreshMonitor* monitor = static_cast<DisplayRefreshMonitor*>(data);
monitor->displayDidRefresh();
}
void DisplayRefreshMonitor::addClient(DisplayRefreshMonitorClient* client)
{
m_clients.add(client);
}
bool DisplayRefreshMonitor::removeClient(DisplayRefreshMonitorClient* client)
{
if (m_clientsToBeNotified)
m_clientsToBeNotified->remove(client);
return m_clients.remove(client);
}
void DisplayRefreshMonitor::displayDidRefresh()
{
double monotonicAnimationStartTime;
{
MutexLocker lock(m_mutex);
if (!m_scheduled)
++m_unscheduledFireCount;
else
m_unscheduledFireCount = 0;
m_scheduled = false;
monotonicAnimationStartTime = m_monotonicAnimationStartTime;
}
// The call back can cause all our clients to be unregistered, so we need to protect
// against deletion until the end of the method.
Ref<DisplayRefreshMonitor> protect(*this);
// Copy the hash table and remove clients from it one by one so we don't notify
// any client twice, but can respond to removal of clients during the delivery process.
HashSet<DisplayRefreshMonitorClient*> clientsToBeNotified = m_clients;
m_clientsToBeNotified = &clientsToBeNotified;
while (!clientsToBeNotified.isEmpty()) {
DisplayRefreshMonitorClient* client = clientsToBeNotified.takeAny();
client->fireDisplayRefreshIfNeeded(monotonicAnimationStartTime);
// This checks if this function was reentered. In that case, stop iterating
// since it's not safe to use the set any more.
if (m_clientsToBeNotified != &clientsToBeNotified)
break;
}
if (m_clientsToBeNotified == &clientsToBeNotified)
m_clientsToBeNotified = nullptr;
{
MutexLocker lock(m_mutex);
m_previousFrameDone = true;
}
DisplayRefreshMonitorManager::sharedManager().displayDidRefresh(this);
}
}
#endif // USE(REQUEST_ANIMATION_FRAME_DISPLAY_MONITOR)
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