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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.
*/
#ifndef DisplayRefreshMonitor_h
#define DisplayRefreshMonitor_h
#if USE(REQUEST_ANIMATION_FRAME_DISPLAY_MONITOR)
#include "PlatformScreen.h"
#include <wtf/HashSet.h>
#include <wtf/RefCounted.h>
#include <wtf/RefPtr.h>
#include <wtf/Threading.h>
namespace WebCore {
class DisplayAnimationClient;
class DisplayRefreshMonitorClient;
class DisplayRefreshMonitor : public RefCounted<DisplayRefreshMonitor> {
public:
static PassRefPtr<DisplayRefreshMonitor> create(DisplayRefreshMonitorClient*);
WEBCORE_EXPORT virtual ~DisplayRefreshMonitor();
// Return true if callback request was scheduled, false if it couldn't be
// (e.g., hardware refresh is not available)
virtual bool requestRefreshCallback() = 0;
void windowScreenDidChange(PlatformDisplayID);
bool hasClients() const { return m_clients.size(); }
void addClient(DisplayRefreshMonitorClient*);
bool removeClient(DisplayRefreshMonitorClient*);
PlatformDisplayID displayID() const { return m_displayID; }
bool shouldBeTerminated() const
{
const int maxInactiveFireCount = 10;
return !m_scheduled && m_unscheduledFireCount > maxInactiveFireCount;
}
bool isActive() const { return m_active; }
void setIsActive(bool active) { m_active = active; }
bool isScheduled() const { return m_scheduled; }
void setIsScheduled(bool scheduled) { m_scheduled = scheduled; }
bool isPreviousFrameDone() const { return m_previousFrameDone; }
void setIsPreviousFrameDone(bool done) { m_previousFrameDone = done; }
void setMonotonicAnimationStartTime(double startTime) { m_monotonicAnimationStartTime = startTime; }
Mutex& mutex() { return m_mutex; }
protected:
WEBCORE_EXPORT explicit DisplayRefreshMonitor(PlatformDisplayID);
WEBCORE_EXPORT static void handleDisplayRefreshedNotificationOnMainThread(void* data);
private:
void displayDidRefresh();
double m_monotonicAnimationStartTime;
bool m_active;
bool m_scheduled;
bool m_previousFrameDone;
int m_unscheduledFireCount; // Number of times the display link has fired with no clients.
PlatformDisplayID m_displayID;
Mutex m_mutex;
HashSet<DisplayRefreshMonitorClient*> m_clients;
HashSet<DisplayRefreshMonitorClient*>* m_clientsToBeNotified;
};
}
#endif // USE(REQUEST_ANIMATION_FRAME_DISPLAY_MONITOR)
#endif
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