Adds hasArrSupport api

BUG: 361433651
Test: atest DisplayModeDirectorTest && atest BrightnessObserverTest && atest SettingsObserverTest
Flag: com.android.server.display.feature.flags.enable_has_arr_support

Change-Id: I4a313424ecf5639f90b7323203293e4b1534c590
diff --git a/core/api/current.txt b/core/api/current.txt
index 565254f..f892495 100644
--- a/core/api/current.txt
+++ b/core/api/current.txt
@@ -50909,6 +50909,7 @@
     method public android.view.Display.Mode[] getSupportedModes();
     method @Deprecated public float[] getSupportedRefreshRates();
     method @Deprecated public int getWidth();
+    method @FlaggedApi("com.android.server.display.feature.flags.enable_has_arr_support") public boolean hasArrSupport();
     method public boolean isHdr();
     method public boolean isHdrSdrRatioAvailable();
     method public boolean isMinimalPostProcessingSupported();
diff --git a/core/java/android/view/Display.java b/core/java/android/view/Display.java
index 8a8022c..e940e55bd 100644
--- a/core/java/android/view/Display.java
+++ b/core/java/android/view/Display.java
@@ -21,6 +21,7 @@
 import static android.hardware.flags.Flags.FLAG_OVERLAYPROPERTIES_CLASS_API;
 
 import static com.android.server.display.feature.flags.Flags.FLAG_HIGHEST_HDR_SDR_RATIO_API;
+import static com.android.server.display.feature.flags.Flags.FLAG_ENABLE_HAS_ARR_SUPPORT;
 
 import android.Manifest;
 import android.annotation.FlaggedApi;
@@ -1266,6 +1267,18 @@
     }
 
     /**
+     * Returns whether display supports adaptive refresh rate or not.
+     */
+    // TODO(b/372526856) Add a link to the documentation for ARR.
+    @FlaggedApi(FLAG_ENABLE_HAS_ARR_SUPPORT)
+    public boolean hasArrSupport() {
+        synchronized (mLock) {
+            updateDisplayInfoLocked();
+            return mDisplayInfo.hasArrSupport;
+        }
+    }
+
+    /**
      * <p> Returns true if the connected display can be switched into a mode with minimal
      * post processing. </p>
      *
diff --git a/core/java/android/view/DisplayInfo.java b/core/java/android/view/DisplayInfo.java
index cac3e3c..26fce90 100644
--- a/core/java/android/view/DisplayInfo.java
+++ b/core/java/android/view/DisplayInfo.java
@@ -198,6 +198,12 @@
     public float renderFrameRate;
 
     /**
+     * If {@code true} this Display supports adaptive refresh rates.
+     * // TODO(b/372526856) Add a link to the documentation for ARR.
+     */
+    public boolean hasArrSupport;
+
+    /**
      * The default display mode.
      */
     public int defaultModeId;
@@ -436,6 +442,7 @@
                 && rotation == other.rotation
                 && modeId == other.modeId
                 && renderFrameRate == other.renderFrameRate
+                && hasArrSupport == other.hasArrSupport
                 && defaultModeId == other.defaultModeId
                 && userPreferredModeId == other.userPreferredModeId
                 && Arrays.equals(supportedModes, other.supportedModes)
@@ -497,6 +504,7 @@
         rotation = other.rotation;
         modeId = other.modeId;
         renderFrameRate = other.renderFrameRate;
+        hasArrSupport = other.hasArrSupport;
         defaultModeId = other.defaultModeId;
         userPreferredModeId = other.userPreferredModeId;
         supportedModes = Arrays.copyOf(other.supportedModes, other.supportedModes.length);
@@ -553,6 +561,7 @@
         rotation = source.readInt();
         modeId = source.readInt();
         renderFrameRate = source.readFloat();
+        hasArrSupport = source.readBoolean();
         defaultModeId = source.readInt();
         userPreferredModeId = source.readInt();
         int nModes = source.readInt();
@@ -626,6 +635,7 @@
         dest.writeInt(rotation);
         dest.writeInt(modeId);
         dest.writeFloat(renderFrameRate);
+        dest.writeBoolean(hasArrSupport);
         dest.writeInt(defaultModeId);
         dest.writeInt(userPreferredModeId);
         dest.writeInt(supportedModes.length);
@@ -871,6 +881,8 @@
         sb.append(modeId);
         sb.append(", renderFrameRate ");
         sb.append(renderFrameRate);
+        sb.append(", hasArrSupport ");
+        sb.append(hasArrSupport);
         sb.append(", defaultMode ");
         sb.append(defaultModeId);
         sb.append(", userPreferredModeId ");
diff --git a/core/java/android/view/SurfaceControl.java b/core/java/android/view/SurfaceControl.java
index 19e244a..e6de478 100644
--- a/core/java/android/view/SurfaceControl.java
+++ b/core/java/android/view/SurfaceControl.java
@@ -1810,6 +1810,7 @@
         public DisplayMode[] supportedDisplayModes;
         public int activeDisplayModeId;
         public float renderFrameRate;
+        public boolean hasArrSupport;
 
         public int[] supportedColorModes;
         public int activeColorMode;
@@ -1827,6 +1828,7 @@
                     + "supportedDisplayModes=" + Arrays.toString(supportedDisplayModes)
                     + ", activeDisplayModeId=" + activeDisplayModeId
                     + ", renderFrameRate=" + renderFrameRate
+                    + ", hasArrSupport=" + hasArrSupport
                     + ", supportedColorModes=" + Arrays.toString(supportedColorModes)
                     + ", activeColorMode=" + activeColorMode
                     + ", hdrCapabilities=" + hdrCapabilities
@@ -1846,13 +1848,14 @@
                 && Arrays.equals(supportedColorModes, that.supportedColorModes)
                 && activeColorMode == that.activeColorMode
                 && Objects.equals(hdrCapabilities, that.hdrCapabilities)
-                && preferredBootDisplayMode == that.preferredBootDisplayMode;
+                && preferredBootDisplayMode == that.preferredBootDisplayMode
+                && hasArrSupport == that.hasArrSupport;
         }
 
         @Override
         public int hashCode() {
             return Objects.hash(Arrays.hashCode(supportedDisplayModes), activeDisplayModeId,
-                    renderFrameRate, activeColorMode, hdrCapabilities);
+                    renderFrameRate, activeColorMode, hdrCapabilities, hasArrSupport);
         }
     }
 
diff --git a/core/jni/android_view_SurfaceControl.cpp b/core/jni/android_view_SurfaceControl.cpp
index a939d92..755704a 100644
--- a/core/jni/android_view_SurfaceControl.cpp
+++ b/core/jni/android_view_SurfaceControl.cpp
@@ -115,6 +115,7 @@
     jfieldID supportedDisplayModes;
     jfieldID activeDisplayModeId;
     jfieldID renderFrameRate;
+    jfieldID hasArrSupport;
     jfieldID supportedColorModes;
     jfieldID activeColorMode;
     jfieldID hdrCapabilities;
@@ -1453,7 +1454,7 @@
     env->SetIntField(object, gDynamicDisplayInfoClassInfo.activeDisplayModeId,
                      info.activeDisplayModeId);
     env->SetFloatField(object, gDynamicDisplayInfoClassInfo.renderFrameRate, info.renderFrameRate);
-
+    env->SetBooleanField(object, gDynamicDisplayInfoClassInfo.hasArrSupport, info.hasArrSupport);
     jintArray colorModesArray = env->NewIntArray(info.supportedColorModes.size());
     if (colorModesArray == NULL) {
         jniThrowException(env, "java/lang/OutOfMemoryError", NULL);
@@ -2641,6 +2642,8 @@
             GetFieldIDOrDie(env, dynamicInfoClazz, "activeDisplayModeId", "I");
     gDynamicDisplayInfoClassInfo.renderFrameRate =
             GetFieldIDOrDie(env, dynamicInfoClazz, "renderFrameRate", "F");
+    gDynamicDisplayInfoClassInfo.hasArrSupport =
+            GetFieldIDOrDie(env, dynamicInfoClazz, "hasArrSupport", "Z");
     gDynamicDisplayInfoClassInfo.supportedColorModes =
             GetFieldIDOrDie(env, dynamicInfoClazz, "supportedColorModes", "[I");
     gDynamicDisplayInfoClassInfo.activeColorMode =
diff --git a/services/core/java/com/android/server/display/DisplayDeviceInfo.java b/services/core/java/com/android/server/display/DisplayDeviceInfo.java
index acf4db3..0807c70 100644
--- a/services/core/java/com/android/server/display/DisplayDeviceInfo.java
+++ b/services/core/java/com/android/server/display/DisplayDeviceInfo.java
@@ -292,6 +292,13 @@
      */
     public float renderFrameRate;
 
+
+    /**
+     * If {@code true}, this Display supports adaptive refresh rates.
+     * @see android.view.DisplayInfo#hasArrSupport for more details.
+     */
+    public boolean hasArrSupport;
+
     /**
      * The default mode of the display.
      */
@@ -540,7 +547,8 @@
                 other.brightnessDefault)
                 || !Objects.equals(roundedCorners, other.roundedCorners)
                 || installOrientation != other.installOrientation
-                || !Objects.equals(displayShape, other.displayShape)) {
+                || !Objects.equals(displayShape, other.displayShape)
+                || hasArrSupport != other.hasArrSupport) {
             diff |= DIFF_OTHER;
         }
         return diff;
@@ -558,6 +566,7 @@
         height = other.height;
         modeId = other.modeId;
         renderFrameRate = other.renderFrameRate;
+        hasArrSupport = other.hasArrSupport;
         defaultModeId = other.defaultModeId;
         userPreferredModeId = other.userPreferredModeId;
         supportedModes = other.supportedModes;
@@ -602,6 +611,7 @@
         sb.append(width).append(" x ").append(height);
         sb.append(", modeId ").append(modeId);
         sb.append(", renderFrameRate ").append(renderFrameRate);
+        sb.append(", hasArrSupport ").append(hasArrSupport);
         sb.append(", defaultModeId ").append(defaultModeId);
         sb.append(", userPreferredModeId ").append(userPreferredModeId);
         sb.append(", supportedModes ").append(Arrays.toString(supportedModes));
diff --git a/services/core/java/com/android/server/display/LocalDisplayAdapter.java b/services/core/java/com/android/server/display/LocalDisplayAdapter.java
index 5edea0a..f9c3a46 100644
--- a/services/core/java/com/android/server/display/LocalDisplayAdapter.java
+++ b/services/core/java/com/android/server/display/LocalDisplayAdapter.java
@@ -246,6 +246,7 @@
         private int mActiveModeId = INVALID_MODE_ID;
         private boolean mDisplayModeSpecsInvalid;
         private int mActiveColorMode;
+        private boolean mHasArrSupport;
         private Display.HdrCapabilities mHdrCapabilities;
         private boolean mAllmSupported;
         private boolean mGameContentTypeSupported;
@@ -311,6 +312,7 @@
             changed |= updateHdrCapabilitiesLocked(dynamicInfo.hdrCapabilities);
             changed |= updateAllmSupport(dynamicInfo.autoLowLatencyModeSupported);
             changed |= updateGameContentTypeSupport(dynamicInfo.gameContentTypeSupported);
+            changed |= updateHasArrSupportLocked(dynamicInfo.hasArrSupport);
 
             if (changed) {
                 mHavePendingChanges = true;
@@ -602,6 +604,14 @@
             return true;
         }
 
+        private boolean updateHasArrSupportLocked(boolean newHasArrSupport) {
+            if (mHasArrSupport == newHasArrSupport) {
+                return false;
+            }
+            mHasArrSupport = newHasArrSupport;
+            return true;
+        }
+
         private boolean updateAllmSupport(boolean supported) {
             if (mAllmSupported == supported) {
                 return false;
@@ -684,6 +694,7 @@
                     mInfo.supportedColorModes[i] = mSupportedColorModes.get(i);
                 }
                 mInfo.hdrCapabilities = mHdrCapabilities;
+                mInfo.hasArrSupport = mHasArrSupport;
                 mInfo.appVsyncOffsetNanos = mActiveSfDisplayMode.appVsyncOffsetNanos;
                 mInfo.presentationDeadlineNanos = mActiveSfDisplayMode.presentationDeadlineNanos;
                 mInfo.state = mState;
@@ -1274,6 +1285,7 @@
             pw.println("mActiveColorMode=" + mActiveColorMode);
             pw.println("mDefaultModeId=" + mDefaultModeId);
             pw.println("mUserPreferredModeId=" + mUserPreferredModeId);
+            pw.println("mHasArrSupport=" + mHasArrSupport);
             pw.println("mState=" + Display.stateToString(mState));
             pw.println("mCommittedState=" + Display.stateToString(mCommittedState));
             pw.println("mBrightnessState=" + mBrightnessState);
diff --git a/services/core/java/com/android/server/display/LogicalDisplay.java b/services/core/java/com/android/server/display/LogicalDisplay.java
index 007e3a8..1d90c29 100644
--- a/services/core/java/com/android/server/display/LogicalDisplay.java
+++ b/services/core/java/com/android/server/display/LogicalDisplay.java
@@ -506,6 +506,7 @@
             mBaseDisplayInfo.rotation = Surface.ROTATION_0;
             mBaseDisplayInfo.modeId = deviceInfo.modeId;
             mBaseDisplayInfo.renderFrameRate = deviceInfo.renderFrameRate;
+            mBaseDisplayInfo.hasArrSupport = deviceInfo.hasArrSupport;
             mBaseDisplayInfo.defaultModeId = deviceInfo.defaultModeId;
             mBaseDisplayInfo.userPreferredModeId = deviceInfo.userPreferredModeId;
             mBaseDisplayInfo.supportedModes = Arrays.copyOf(
diff --git a/services/core/java/com/android/server/display/feature/DisplayManagerFlags.java b/services/core/java/com/android/server/display/feature/DisplayManagerFlags.java
index 99ced7f..b46533f 100644
--- a/services/core/java/com/android/server/display/feature/DisplayManagerFlags.java
+++ b/services/core/java/com/android/server/display/feature/DisplayManagerFlags.java
@@ -222,6 +222,11 @@
             Flags::enableBatteryStatsForAllDisplays
     );
 
+    private final FlagState mHasArrSupport = new FlagState(
+            Flags.FLAG_ENABLE_HAS_ARR_SUPPORT,
+            Flags::enableHasArrSupport
+    );
+
     /**
      * @return {@code true} if 'port' is allowed in display layout configuration file.
      */
@@ -468,6 +473,12 @@
     }
 
     /**
+     * @return {@code true} if hasArrSupport API is enabled.
+     */
+    public boolean hasArrSupportFlag() {
+        return mHasArrSupport.isEnabled();
+    }
+    /**
      * dumps all flagstates
      * @param pw printWriter
      */
@@ -514,6 +525,7 @@
         pw.println(" " + mEnableBatteryStatsForAllDisplays);
         pw.println(" " + mBlockAutobrightnessChangesOnStylusUsage);
         pw.println(" " + mIsUserRefreshRateForExternalDisplayEnabled);
+        pw.println(" " + mHasArrSupport);
     }
 
     private static class FlagState {
diff --git a/services/core/java/com/android/server/wm/DeferredDisplayUpdater.java b/services/core/java/com/android/server/wm/DeferredDisplayUpdater.java
index 3dc035e..cbe3d79 100644
--- a/services/core/java/com/android/server/wm/DeferredDisplayUpdater.java
+++ b/services/core/java/com/android/server/wm/DeferredDisplayUpdater.java
@@ -401,6 +401,7 @@
                 || !Objects.equals(first.deviceProductInfo, second.deviceProductInfo)
                 || first.modeId != second.modeId
                 || first.renderFrameRate != second.renderFrameRate
+                || first.hasArrSupport != second.hasArrSupport
                 || first.defaultModeId != second.defaultModeId
                 || first.userPreferredModeId != second.userPreferredModeId
                 || !Arrays.equals(first.supportedModes, second.supportedModes)