Merge "Fix a possible starvation issue related to vsync." into jb-dev

        }

    }

    private final class FrameDisplayEventReceiver extends DisplayEventReceiver {

    private final class FrameDisplayEventReceiver extends DisplayEventReceiver

            implements Runnable {

        private long mTimestampNanos;

        private int mFrame;

        public FrameDisplayEventReceiver(Looper looper) {

            super(looper);

        }

        @Override

        public void onVsync(long timestampNanos, int frame) {

            doFrame(timestampNanos, frame);

            // Post the vsync event to the Handler.

            // The idea is to prevent incoming vsync events from completely starving

            // the message queue.  If there are no messages in the queue with timestamps

            // earlier than the frame time, then the vsync event will be processed immediately.

            // Otherwise, messages that predate the vsync event will be handled first.

            mTimestampNanos = timestampNanos;

            mFrame = frame;

            Message msg = Message.obtain(mHandler, this);

            msg.setAsynchronous(true);

            mHandler.sendMessageAtTime(msg, timestampNanos / NANOS_PER_MS);

        }

        @Override

        public void run() {

            doFrame(mTimestampNanos, mFrame);

        }

    }