99 lines
3.1 KiB
C++
99 lines
3.1 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_widget_VsyncDispatcher_h
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#define mozilla_widget_VsyncDispatcher_h
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#include "mozilla/Mutex.h"
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#include "mozilla/TimeStamp.h"
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#include "nsISupportsImpl.h"
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#include "nsTArray.h"
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#include "mozilla/RefPtr.h"
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namespace mozilla {
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class VsyncObserver
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{
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NS_INLINE_DECL_THREADSAFE_REFCOUNTING(VsyncObserver)
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public:
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// The method called when a vsync occurs. Return true if some work was done.
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// In general, this vsync notification will occur on the hardware vsync
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// thread from VsyncSource. But it might also be called on PVsync ipc thread
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// if this notification is cross process. Thus all observer should check the
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// thread model before handling the real task.
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virtual bool NotifyVsync(TimeStamp aVsyncTimestamp) = 0;
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protected:
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VsyncObserver() {}
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virtual ~VsyncObserver() {}
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}; // VsyncObserver
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// Used to dispatch vsync events in the parent process to compositors
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class CompositorVsyncDispatcher final
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{
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NS_INLINE_DECL_THREADSAFE_REFCOUNTING(CompositorVsyncDispatcher)
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public:
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CompositorVsyncDispatcher();
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// Called on the vsync thread when a hardware vsync occurs
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void NotifyVsync(TimeStamp aVsyncTimestamp);
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// Compositor vsync observers must be added/removed on the compositor thread
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void SetCompositorVsyncObserver(VsyncObserver* aVsyncObserver);
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void Shutdown();
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// This can be used to enable or disable thread assertions.
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// This is useful for gtests because usually things run
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// in only one thread in that environment
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static void SetThreadAssertionsEnabled(bool aEnable);
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private:
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void AssertOnCompositorThread();
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virtual ~CompositorVsyncDispatcher();
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void ObserveVsync(bool aEnable);
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Mutex mCompositorObserverLock;
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RefPtr<VsyncObserver> mCompositorVsyncObserver;
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bool mDidShutdown;
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};
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// Dispatch vsync event to ipc actor parent and chrome RefreshTimer.
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class RefreshTimerVsyncDispatcher final
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{
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NS_INLINE_DECL_THREADSAFE_REFCOUNTING(RefreshTimerVsyncDispatcher)
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public:
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RefreshTimerVsyncDispatcher();
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// Please check CompositorVsyncDispatcher::NotifyVsync().
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void NotifyVsync(TimeStamp aVsyncTimestamp);
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// Set chrome process's RefreshTimer to this dispatcher.
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// This function can be called from any thread.
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void SetParentRefreshTimer(VsyncObserver* aVsyncObserver);
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// Add or remove the content process' RefreshTimer to this dispatcher. This
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// will be a no-op for AddChildRefreshTimer() if the observer is already
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// registered.
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// These functions can be called from any thread.
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void AddChildRefreshTimer(VsyncObserver* aVsyncObserver);
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void RemoveChildRefreshTimer(VsyncObserver* aVsyncObserver);
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private:
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virtual ~RefreshTimerVsyncDispatcher();
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void UpdateVsyncStatus();
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bool NeedsVsync();
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Mutex mRefreshTimersLock;
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RefPtr<VsyncObserver> mParentRefreshTimer;
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nsTArray<RefPtr<VsyncObserver>> mChildRefreshTimers;
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};
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} // namespace mozilla
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#endif // mozilla_widget_VsyncDispatcher_h
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