Source code

Revision control

Copy as Markdown

Other Tools

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 */
#ifndef mozilla_widget_AndroidVsync_h
#define mozilla_widget_AndroidVsync_h
#include "mozilla/DataMutex.h"
#include "mozilla/java/AndroidVsyncNatives.h"
#include "mozilla/ThreadSafeWeakPtr.h"
#include "mozilla/TimeStamp.h"
namespace mozilla {
namespace widget {
class AndroidVsyncSupport;
* A thread-safe way to listen to vsync notifications on Android. All methods
* can be called on any thread.
* Observers must keep a strong reference to the AndroidVsync instance until
* they unregister themselves.
class AndroidVsync final : public SupportsThreadSafeWeakPtr<AndroidVsync> {
static RefPtr<AndroidVsync> GetInstance();
class Observer {
// Will be called on the Java UI thread.
virtual void OnVsync(const TimeStamp& aTimeStamp) = 0;
// Will be called on the Java UI thread.
virtual void OnMaybeUpdateRefreshRate() {}
// Called when the observer is unregistered, in case it wants to
// manage its own lifetime.
virtual void Dispose() {}
virtual ~Observer() = default;
// INPUT observers are called before RENDER observers.
enum ObserverType { INPUT, RENDER };
void RegisterObserver(Observer* aObserver, ObserverType aType);
void UnregisterObserver(Observer* aObserver, ObserverType aType);
void OnMaybeUpdateRefreshRate();
friend class AndroidVsyncSupport;
// Called by Java, via AndroidVsyncSupport
void NotifyVsync(int64_t aFrameTimeNanos);
struct Impl {
void UpdateObservingVsync();
nsTArray<Observer*> mInputObservers;
nsTArray<Observer*> mRenderObservers;
RefPtr<AndroidVsyncSupport> mSupport;
java::AndroidVsync::GlobalRef mSupportJava;
bool mObservingVsync = false;
DataMutex<Impl> mImpl;
static StaticDataMutex<ThreadSafeWeakPtr<AndroidVsync>> sInstance;
} // namespace widget
} // namespace mozilla
#endif // mozilla_widget_AndroidVsync_h