Merge "Sync granularity of gestures with vsync" (e64ad663) · Commits · e / os / android_frameworks_base

core/java/android/accessibilityservice/AccessibilityService.java

+27 −1

Original line number	Diff line number	Diff line
		@@ -33,6 +33,7 @@ import android.graphics.ColorSpace;
		import android.graphics.ParcelableColorSpace;
		import android.graphics.Region;
		import android.hardware.HardwareBuffer;
		import android.hardware.display.DisplayManager;
		import android.os.Build;
		import android.os.Handler;
		import android.os.IBinder;
		@@ -1014,8 +1015,9 @@ public abstract class AccessibilityService extends Service {
		if (connection == null) {
		return false;
		}
		int sampleTimeMs = calculateGestureSampleTimeMs(gesture.getDisplayId());
		List<GestureDescription.GestureStep> steps =
		MotionEventGenerator.getGestureStepsFromGestureDescription(gesture, 16);
		MotionEventGenerator.getGestureStepsFromGestureDescription(gesture, sampleTimeMs);
		try {
		synchronized (mLock) {
		mGestureStatusCallbackSequence++;
		@@ -1036,6 +1038,30 @@ public abstract class AccessibilityService extends Service {
		return true;
		}

		/**
		* Returns the sample time in millis of gesture steps for the current display.
		*
		* <p>For gestures to be smooth they should line up with the refresh rate of the display.
		* On versions of Android before R, the sample time was fixed to 100ms.
		*/
		private int calculateGestureSampleTimeMs(int displayId) {
		if (getApplicationInfo().targetSdkVersion <= Build.VERSION_CODES.Q) {
		return 100;
		}
		Display display = getSystemService(DisplayManager.class).getDisplay(
		displayId);
		if (display == null) {
		return 100;
		}
		int msPerSecond = 1000;
		int sampleTimeMs = (int) (msPerSecond / display.getRefreshRate());
		if (sampleTimeMs < 1) {
		// Should be impossible, but do not return 0.
		return 100;
		}
		return sampleTimeMs;
		}

		void onPerformGestureResult(int sequence, final boolean completedSuccessfully) {
		if (mGestureStatusCallbackInfos == null) {
		return;