gecko-dev/widget/VsyncDispatcher.h

63 lines
1.9 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef mozilla_widget_VsyncDispatcher_h
#define mozilla_widget_VsyncDispatcher_h
#include "base/message_loop.h"
#include "mozilla/Mutex.h"
#include "nsISupportsImpl.h"
#include "nsTArray.h"
#include "ThreadSafeRefcountingWithMainThreadDestruction.h"
namespace mozilla {
class TimeStamp;
namespace layers {
class CompositorVsyncObserver;
}
class VsyncObserver
{
NS_INLINE_DECL_THREADSAFE_REFCOUNTING(VsyncObserver)
public:
// The method called when a vsync occurs. Return true if some work was done.
// Vsync notifications will occur on the hardware vsync thread
virtual bool NotifyVsync(TimeStamp aVsyncTimestamp) = 0;
protected:
VsyncObserver() {}
virtual ~VsyncObserver() {}
}; // VsyncObserver
class CompositorVsyncDispatcher MOZ_FINAL
{
NS_INLINE_DECL_THREADSAFE_REFCOUNTING(CompositorVsyncDispatcher)
public:
CompositorVsyncDispatcher();
// Called on the vsync thread when a hardware vsync occurs
// The aVsyncTimestamp can mean different things depending on the platform:
// b2g - The vsync timestamp of the previous frame that was just displayed
// OSX - The vsync timestamp of the upcoming frame
// TODO: Windows / Linux. DOCUMENT THIS WHEN IMPLEMENTING ON THOSE PLATFORMS
// Android: TODO
void NotifyVsync(TimeStamp aVsyncTimestamp);
// Compositor vsync observers must be added/removed on the compositor thread
void SetCompositorVsyncObserver(VsyncObserver* aVsyncObserver);
void Shutdown();
private:
virtual ~CompositorVsyncDispatcher();
Mutex mCompositorObserverLock;
nsRefPtr<VsyncObserver> mCompositorVsyncObserver;
};
} // namespace mozilla
#endif // __mozilla_widget_VsyncDispatcher_h