DisplayRefreshMonitor.h [plain text]
#pragma once
#if USE(REQUEST_ANIMATION_FRAME_DISPLAY_MONITOR)
#include "PlatformScreen.h"
#include <wtf/HashSet.h>
#include <wtf/Lock.h>
#include <wtf/RefCounted.h>
#include <wtf/RefPtr.h>
namespace WebCore {
class DisplayAnimationClient;
class DisplayRefreshMonitorClient;
class DisplayRefreshMonitor : public RefCounted<DisplayRefreshMonitor> {
public:
static RefPtr<DisplayRefreshMonitor> create(DisplayRefreshMonitorClient&);
WEBCORE_EXPORT virtual ~DisplayRefreshMonitor();
virtual void displayLinkFired() { }
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 = 20;
return !m_scheduled && m_unscheduledFireCount > maxInactiveFireCount;
}
static RefPtr<DisplayRefreshMonitor> createDefaultDisplayRefreshMonitor(PlatformDisplayID);
protected:
WEBCORE_EXPORT explicit DisplayRefreshMonitor(PlatformDisplayID);
WEBCORE_EXPORT static void handleDisplayRefreshedNotificationOnMainThread(void* data);
friend class DisplayRefreshMonitorManager;
Lock& mutex() { return m_mutex; }
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; }
virtual bool hasRequestedRefreshCallback() const { return false; }
private:
void displayDidRefresh();
HashSet<DisplayRefreshMonitorClient*> m_clients;
HashSet<DisplayRefreshMonitorClient*>* m_clientsToBeNotified { nullptr };
Lock m_mutex;
PlatformDisplayID m_displayID { 0 };
int m_unscheduledFireCount { 0 }; bool m_active { true };
bool m_scheduled { false };
bool m_previousFrameDone { true };
};
}
#endif // USE(REQUEST_ANIMATION_FRAME_DISPLAY_MONITOR)