Add DisplayManager API to query if the device supports seamless refresh

rate switching

It was added as a PackageManager flag earlier. Removing from there,
because PackageManagere flags are only recommendded when applications need them to filter whether they can run on a given device.

Bug: 186189147
Test: m
Change-Id: I16475b750d223caf064c413b18851b302eb4e223

core/api/current.txt

@@ -12165,7 +12165,6 @@ package android.content.pm {
     field public static final String FEATURE_RAM_NORMAL = "android.hardware.ram.normal";
     field public static final String FEATURE_SCREEN_LANDSCAPE = "android.hardware.screen.landscape";
     field public static final String FEATURE_SCREEN_PORTRAIT = "android.hardware.screen.portrait";
-    field public static final String FEATURE_SEAMLESS_REFRESH_RATE_SWITCHING = "android.software.seamless_refresh_rate_switching";
     field public static final String FEATURE_SECURELY_REMOVES_USERS = "android.software.securely_removes_users";
     field public static final String FEATURE_SECURE_LOCK_SCREEN = "android.software.secure_lock_screen";
     field public static final String FEATURE_SECURITY_MODEL_COMPATIBLE = "android.hardware.security.model.compatible";

core/java/android/content/pm/PackageManager.java

@@ -2978,14 +2978,6 @@ public abstract class PackageManager {
     public static final String FEATURE_VIRTUALIZATION_FRAMEWORK =
             "android.software.virtualization_framework";
 
-    /**
-     * Feature for {@link #getSystemAvailableFeatures()} and {@link #hasSystemFeature(String)}.
-     * This feature indicates whether device supports seamless refresh rate switching.
-     */
-    @SdkConstant(SdkConstantType.FEATURE)
-    public static final String FEATURE_SEAMLESS_REFRESH_RATE_SWITCHING
-            = "android.software.seamless_refresh_rate_switching";
-
     /**
      * Feature for {@link #getSystemAvailableFeatures} and
      * {@link #hasSystemFeature(String, int)}: If this feature is supported, the Vulkan

core/java/android/hardware/display/DisplayManager.java

@@ -50,6 +50,8 @@ import android.util.SparseArray;
 import android.view.Display;
 import android.view.Surface;
 
+import com.android.internal.R;
+
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
 import java.util.ArrayList;
@@ -1309,6 +1311,22 @@ public final class DisplayManager {
         return mGlobal.shouldAlwaysRespectAppRequestedMode();
     }
 
+    /**
+     * Returns whether device supports seamless refresh rate switching.
+     *
+     * Match content frame rate setting has three options: seamless, non-seamless and never.
+     * The seamless option does nothing if the device does not support seamless refresh rate
+     * switching. This API is used in such a case to hide the seamless option.
+     *
+     * @see DisplayManager#setRefreshRateSwitchingType
+     * @see DisplayManager#getMatchContentFrameRateUserPreference
+     * @hide
+     */
+    public boolean supportsSeamlessRefreshRateSwitching() {
+        return mContext.getResources().getBoolean(
+                R.bool.config_supportsSeamlessRefreshRateSwitching);
+    }
+
     /**
      * Sets the refresh rate switching type.
      * This matches {@link android.provider.Settings.Secure.MATCH_CONTENT_FRAME_RATE}

core/res/res/values/config.xml

@@ -4411,6 +4411,9 @@
     <!-- Allow SystemUI to show the shutdown dialog -->
     <bool name="config_showSysuiShutdown">true</bool>
 
+    <!-- Flag indicating whether seamless refresh rate switching is supported by a device. -->
+    <bool name="config_supportsSeamlessRefreshRateSwitching">true</bool>
+
     <!-- The stable device width and height in pixels. If these aren't set to a positive number
          then the device will use the width and height of the default display the first time it's
          booted.  -->

core/res/res/values/symbols.xml

@@ -3879,6 +3879,7 @@
   <java-symbol type="id" name="messaging_group_icon_container" />
   <java-symbol type="id" name="messaging_group_sending_progress" />
   <java-symbol type="id" name="messaging_group_sending_progress_container" />
+  <java-symbol type="bool" name="config_supportsSeamlessRefreshRateSwitching" />
 
   <java-symbol type="integer" name="config_stableDeviceDisplayWidth" />
   <java-symbol type="integer" name="config_stableDeviceDisplayHeight" />