[ARR] Use sysprop for velocity to frame rate mapping. (3f7d8c67) · Commits · e / os / android_frameworks_base

core/java/android/view/View.java

+140 −0

Original line number	Diff line number	Diff line
		@@ -51,6 +51,7 @@ import static android.view.flags.Flags.sensitiveContentAppProtection;
		import static android.view.flags.Flags.toolkitFrameRateBySizeReadOnly;
		import static android.view.flags.Flags.toolkitMetricsForFrameRateDecision;
		import static android.view.flags.Flags.toolkitSetFrameRateReadOnly;
		import static android.view.flags.Flags.toolkitVelocitySysprop;
		import static android.view.flags.Flags.toolkitViewgroupSetRequestedFrameRateApi;
		import static android.view.flags.Flags.viewVelocityApi;
		import static android.view.inputmethod.Flags.FLAG_HOME_SCREEN_HANDWRITING_DELEGATOR;
		@@ -151,6 +152,7 @@ import android.os.SystemClock;
		import android.os.Trace;
		import android.service.credentials.CredentialProviderService;
		import android.sysprop.DisplayProperties;
		import android.sysprop.ViewProperties;
		import android.text.InputType;
		import android.text.TextUtils;
		import android.util.ArraySet;
		@@ -216,6 +218,7 @@ import android.widget.ScrollBarDrawable;
		import android.window.OnBackInvokedDispatcher;

		import com.android.internal.R;
		import com.android.internal.annotations.VisibleForTesting;
		import com.android.internal.util.ArrayUtils;
		import com.android.internal.util.FrameworkStatsLog;
		import com.android.internal.util.Preconditions;
		@@ -241,6 +244,7 @@ import java.util.Arrays;
		import java.util.Calendar;
		import java.util.Collection;
		import java.util.Collections;
		import java.util.Comparator;
		import java.util.HashMap;
		import java.util.List;
		import java.util.Locale;
		@@ -2468,6 +2472,113 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
		private static boolean sToolkitViewGroupFrameRateApiFlagValue =
		toolkitViewgroupSetRequestedFrameRateApi();

		// The read-write flag toolkitVelocitySysprop() cannot be initialized at Zygote. To prevent
		// this, initialize inside this class with special name NoPreloadHolder which prevents
		// initialization at Zygote.
		/** @hide */
		@VisibleForTesting
		static final class NoPreloadHolder {
		private static boolean sToolkitVelocitySyspropFlagValue = toolkitVelocitySysprop();
		private static String sFrameRateSysProp =
		ViewProperties.vrr_velocity_threshold().orElse("");

		static {
		if (sToolkitVelocitySyspropFlagValue && !sFrameRateSysProp.isEmpty()) {
		sFrameRateMappings = parseFrameRateMapping(sFrameRateSysProp);
		}
		}

		/**
		* For parsing the frame rate mapping string.
		*
		* @hide
		*/
		@VisibleForTesting
		static int[][] parseFrameRateMapping(String mappings) {
		if (mappings.isEmpty()) {
		return null;
		}

		int columnCount = 0;
		int atCount = 0;
		int pairCount = 0;
		int startIndex = 0;
		int endIndex = mappings.length() - 1;

		// Find the first non column character
		while (startIndex <= endIndex && mappings.charAt(startIndex) == ':') {
		startIndex++;
		}
		// Find the last non column character
		while (startIndex <= endIndex && mappings.charAt(endIndex) == ':') {
		endIndex--;
		}
		if (startIndex >= endIndex) {
		return null;
		}

		// First pass: Count the number of mappings
		for (int i = startIndex; i <= endIndex; i++) {
		if (mappings.charAt(i) == ':') {
		if (((i > 0) && mappings.charAt(i - 1) == ':')) {
		continue;
		}
		pairCount++;
		}
		}
		pairCount++; // Add 1 for the last mapping

		int[][] mappingArray = new int[pairCount][2];
		int currentIndex = startIndex;
		try {
		for (int i = startIndex; i <= endIndex; i++) {
		if (mappings.charAt(i) == ':') {
		// handle consecutive columns
		if (((i > 0) && mappings.charAt(i - 1) == ':')) {
		currentIndex++;
		continue;
		}
		// assign velocity threshold value
		mappingArray[columnCount][0] =
		Integer.parseInt(mappings.substring(currentIndex, i).trim());
		columnCount++;
		if (columnCount != atCount) {
		throw new IllegalArgumentException();
		}
		currentIndex = i + 1;
		} else if (mappings.charAt(i) == '@') {
		// handle consecutive @
		if ((i > 0) && mappings.charAt(i - 1) == '@') {
		currentIndex++;
		continue;
		}
		// assign frame rate value
		mappingArray[columnCount][1] =
		Integer.parseInt(mappings.substring(currentIndex, i).trim());
		atCount++;
		if (atCount != columnCount + 1) {
		throw new IllegalArgumentException();
		}
		currentIndex = i + 1;
		}
		}

		if (atCount != columnCount + 1 \|\| atCount != pairCount
		\|\| currentIndex == mappings.length()) {
		throw new IllegalArgumentException();
		}
		// the last velocity threshold value
		mappingArray[columnCount][0] =
		Integer.parseInt(mappings.substring(currentIndex, endIndex + 1).trim());
		} catch (IllegalArgumentException e) {
		Log.e(VIEW_LOG_TAG, "Format should be frameRate1@threshold1:frameRate2@threshold2");
		}

		Arrays.sort(mappingArray, Comparator.comparingInt(pair -> -pair[0]));
		return mappingArray;
		}
		}

		// Used to set frame rate compatibility.
		@Surface.FrameRateCompatibility int mFrameRateCompatibility =
		FRAME_RATE_COMPATIBILITY_FIXED_SOURCE;
		@@ -5808,6 +5919,8 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
		*/
		private static final float FRAME_RATE_SIZE_PERCENTAGE_THRESHOLD = 0.07f;

		private static int[][] sFrameRateMappings;

		static final float MAX_FRAME_RATE = 120;

		// The preferred frame rate of the view that is mainly used for
		@@ -34411,6 +34524,10 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
		}

		private float convertVelocityToFrameRate(float velocityPps) {
		if (NoPreloadHolder.sToolkitVelocitySyspropFlagValue && sFrameRateMappings != null
		&& sFrameRateMappings.length > 0) {
		return getFrameRateByVelocity(sFrameRateMappings, (int) velocityPps);
		}
		// Internal testing has shown that this gives a premium experience:
		// above 300dp/s => 120fps
		// between 300dp/s and 125fps => 80fps
		@@ -34569,4 +34686,27 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
		}
		return rootView.getJankTracker();
		}

		private int getFrameRateByVelocity(int[][] mappings, int velocity) {
		if (mappings == null \|\| mappings.length == 0) {
		return 0;
		}

		int frameRate = 0; // Default return if no matching pair is found
		// pair[0] is the threshold value and pair[1] is the frame rate
		for (int index = 0; index < mappings.length; index++) {
		if (velocity >= mappings[index][0]) {
		frameRate = mappings[index][1];
		break; // Found the first matching pair, no need to continue
		}
		}

		// If no match found, the last value is returned
		if (frameRate == 0 && mappings.length > 0) {
		frameRate = mappings[mappings.length - 1][1];
		}

		return frameRate;
		}

		}

core/java/android/view/flags/refresh_rate_flags.aconfig

+11 −1

Original line number	Diff line number	Diff line
		@@ -95,3 +95,13 @@ flag {
		description: "Feature flag to ennable ARR debug message"
		bug: "394614443"
		}

		flag {
		name: "toolkit_velocity_sysprop"
		namespace: "toolkit"
		description: "Feature flag to map velocity to frame rate using sysprop"
		bug: "404936438"
		metadata {
		purpose: PURPOSE_BUGFIX
		}
		}

core/sysprop/ViewProperties.sysprop

+13 −0

Original line number	Diff line number	Diff line
		@@ -27,3 +27,16 @@ prop {
		scope: Internal
		access: Readonly
		}

		# Provide OEMs with the flexibility to override
		# the velocity mapping threshold as needed.
		# Please format the values in the following manner:
		# frameRate1@threshold1:frameRate2@threshold2
		# For example, 120@1000:80@700:60@500
		prop {
		api_name: "vrr_velocity_threshold"
		type: String
		prop_name: "ro.view.vrr.velocity_threshold"
		scope: Internal
		access: Readonly
		}

core/tests/coretests/src/android/view/ViewFrameRateTest.java

+41 −0

Original line number	Diff line number	Diff line
		@@ -1237,6 +1237,47 @@ public class ViewFrameRateTest {
		waitForAfterDraw();
		}

		@Test
		public void parseFrameRateMappings() throws Throwable {
		if (!ViewProperties.vrr_enabled().orElse(true)) {
		return;
		}

		int[] twoPairs = {800, 80, 300, 30};
		int[] threePairs = {1000, 120, 800, 80, 600, 60};

		int[][] mappings = View.NoPreloadHolder.parseFrameRateMapping("");
		assertTrue(mappings == null);

		mappings = View.NoPreloadHolder.parseFrameRateMapping("::");
		assertTrue(mappings == null);

		mappings = View.NoPreloadHolder.parseFrameRateMapping("80@800:30@300");
		for (int i = 0; i < twoPairs.length; i++) {
		assertEquals(twoPairs[i], mappings[i / 2][i % 2]);
		}

		mappings = View.NoPreloadHolder.parseFrameRateMapping("80@800:60@600:120@1000");
		for (int i = 0; i < threePairs.length; i++) {
		assertEquals(threePairs[i], mappings[i / 2][i % 2]);
		}

		mappings = View.NoPreloadHolder.parseFrameRateMapping("80@@800:60@@@600:120@1000");
		for (int i = 0; i < threePairs.length; i++) {
		assertEquals(threePairs[i], mappings[i / 2][i % 2]);
		}

		mappings = View.NoPreloadHolder.parseFrameRateMapping(":120@1000:::60@600::80@800:");
		for (int i = 0; i < threePairs.length; i++) {
		assertEquals(threePairs[i], mappings[i / 2][i % 2]);
		}

		mappings = View.NoPreloadHolder.parseFrameRateMapping(":120@@1000:::60@600::80@@@800:");
		for (int i = 0; i < threePairs.length; i++) {
		assertEquals(threePairs[i], mappings[i / 2][i % 2]);
		}
		}

		private void runAfterDraw(@NonNull Runnable runnable) {
		Handler handler = new Handler(Looper.getMainLooper());
		mAfterDrawLatch = new CountDownLatch(1);