Global Metrics

Spaces Data

Minimal test - lines (15, 73)

Code

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 {
 public:
  MOZ_DECLARE_THREADSAFEWEAKREFERENCE_TYPENAME(AndroidVsync)
  MOZ_DECLARE_REFCOUNTED_TYPENAME(AndroidVsync)

  static RefPtr GetInstance();

  ~AndroidVsync();

  class Observer {
   public:
    // Will be called on the Java UI thread.
    virtual void OnVsync(const TimeStamp& aTimeStamp) = 0;
  };

  // INPUT observers are called before RENDER observers.
  enum ObserverType { INPUT, RENDER };
  void RegisterObserver(Observer* aObserver, ObserverType aType);
  void UnregisterObserver(Observer* aObserver, ObserverType aType);

  TimeDuration GetVsyncRate();

 private:
  friend class AndroidVsyncSupport;

  AndroidVsync();

  // Called by Java, via AndroidVsyncSupport
  void NotifyVsync(int64_t aFrameTimeNanos);

  struct Impl {
    void UpdateObservingVsync();

    TimeDuration mVsyncDuration;
    nsTArray mInputObservers;
    nsTArray mRenderObservers;
    RefPtr mSupport;
    java::AndroidVsync::GlobalRef mSupportJava;
    bool mObservingVsync = false;
  };

  DataMutex mImpl;

  static StaticDataMutex> sInstance;
};

}  // namespace widget
}  // namespace mozilla