Improve performance by extracting windowManager and getRotatedValues()

Once sensor listeners are registered, onSensorChanged() (and subsequently
getRotatedValues()) gets called multiple times per socond. Obtaining
WindowManager on each of those calls is superfluous and can be avoided
by extracting it to a lazy class val. getRotatedValue() can also be
called before checking sensor type, and used for each one of them,
resulting in less code repetition.

Author: melquiadess

platform/android/java/lib/src/org/godotengine/godot/Godot.kt

@@ -85,6 +85,9 @@ class Godot(private val context: Context) : SensorEventListener {
 		private val TAG = Godot::class.java.simpleName
 	}
 
+	private val windowManager: WindowManager by lazy {
+		requireActivity().getSystemService(Context.WINDOW_SERVICE) as WindowManager
+	}
 	private val pluginRegistry: GodotPluginRegistry by lazy {
 		GodotPluginRegistry.getPluginRegistry()
 	}
@@ -818,11 +821,8 @@ class Godot(private val context: Context) : SensorEventListener {
 		if (values == null || values.size != 3) {
 			return null
 		}
-		val display =
-			(requireActivity().getSystemService(Context.WINDOW_SERVICE) as WindowManager).defaultDisplay
-		val displayRotation = display.rotation
 		val rotatedValues = FloatArray(3)
-		when (displayRotation) {
+		when (windowManager.defaultDisplay.rotation) {
 			Surface.ROTATION_0 -> {
 				rotatedValues[0] = values[0]
 				rotatedValues[1] = values[1]
@@ -851,40 +851,35 @@ class Godot(private val context: Context) : SensorEventListener {
 		if (renderView == null) {
 			return
 		}
+
+		val rotatedValues = getRotatedValues(event.values)
+
 		when (event.sensor.type) {
 			Sensor.TYPE_ACCELEROMETER -> {
-				getRotatedValues(event.values)?.let { rotatedValues ->
+				rotatedValues?.let {
 					renderView?.queueOnRenderThread {
-						GodotLib.accelerometer(
-							-rotatedValues[0], -rotatedValues[1], -rotatedValues[2]
-						)
+						GodotLib.accelerometer(-it[0], -it[1], -it[2])
 					}
 				}
 			}
 			Sensor.TYPE_GRAVITY -> {
-				getRotatedValues(event.values)?.let { rotatedValues ->
+				rotatedValues?.let {
 					renderView?.queueOnRenderThread {
-						GodotLib.gravity(
-							-rotatedValues[0], -rotatedValues[1], -rotatedValues[2]
-						)
+						GodotLib.gravity(-it[0], -it[1], -it[2])
 					}
 				}
 			}
 			Sensor.TYPE_MAGNETIC_FIELD -> {
-				getRotatedValues(event.values)?.let { rotatedValues ->
+				rotatedValues?.let {
 					renderView?.queueOnRenderThread {
-						GodotLib.magnetometer(
-							-rotatedValues[0], -rotatedValues[1], -rotatedValues[2]
-						)
+						GodotLib.magnetometer(-it[0], -it[1], -it[2])
 					}
 				}
 			}
 			Sensor.TYPE_GYROSCOPE -> {
-				getRotatedValues(event.values)?.let { rotatedValues ->
+				rotatedValues?.let {
 					renderView?.queueOnRenderThread {
-						GodotLib.gyroscope(
-							rotatedValues[0], rotatedValues[1], rotatedValues[2]
-						)
+						GodotLib.gyroscope(it[0], it[1], it[2])
 					}
 				}
 			}