display: allow changing HDR brightness intensity

Change-Id: I96ffa2daa120b6d85bda07633e050f23cd006867

Author: rmp22

res/values/strings.xml

@@ -13923,4 +13923,5 @@
     <!-- HDR Display -->
     <string name="hdr_display_title">HDR Display</string>
     <string name="hdr_display_summary">Enable peak brightness for HDR content. This will increase battery usage</string>
+    <string name="hdr_max_brightness_percent_title">HDR Display intensity</string>
 </resources>

res/xml/display_settings.xml

@@ -17,6 +17,7 @@
 <PreferenceScreen
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:settings="http://schemas.android.com/apk/res-auto"
+    xmlns:app="http://schemas.android.com/apk/res/com.android.settings"
     android:key="display_settings_screen"
     android:title="@string/display_settings"
     settings:keywords="@string/keywords_display">
@@ -197,7 +198,17 @@
             android:key="hdr_display"
             android:title="@string/hdr_display_title"
             android:summary="@string/hdr_display_summary"
-            settings:controller="com.android.settings.display.HdrDisplayPreferenceController"/>  
+            settings:controller="com.android.settings.display.HdrDisplayPreferenceController"/>
+
+        <com.crdroid.settings.preferences.SecureSettingSeekBarPreference
+            android:key="hdr_max_brightness_percent"
+            android:title="@string/hdr_max_brightness_percent_title"
+            android:max="100"
+            app:min="10"
+            android:defaultValue="100"
+            android:dependency="hdr_display"
+            settings:controller="com.android.settings.display.HdrDisplayBrightnessPreferenceController"
+            settings:interval="1"/>      
 
         <SwitchPreferenceCompat
             android:key="show_operator_name"

src/com/android/settings/display/HdrDisplayBrightnessPreferenceController.java

@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2025 The AxionAOSP Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
+ * except in compliance with the License. You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed under the
+ * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the specific language governing
+ * permissions and limitations under the License.
+ */
+package com.android.settings.display;
+
+import android.content.Context;
+import android.os.SystemProperties;
+
+import androidx.preference.Preference;
+import androidx.preference.PreferenceScreen;
+
+import com.android.settings.R;
+import com.android.settings.core.BasePreferenceController;
+
+public class HdrDisplayBrightnessPreferenceController extends BasePreferenceController {
+
+    private static final String HDR_MAX_BRIGHTNESS_PERCENT = "hdr_max_brightness_percent";
+
+    public HdrDisplayBrightnessPreferenceController(Context context, String key) {
+        super(context, key);
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        return SystemProperties.getBoolean("ro.surface_flinger.has_HDR_display", false)
+                ? AVAILABLE : UNSUPPORTED_ON_DEVICE;
+    }
+
+    @Override
+    public int getSliceHighlightMenuRes() {
+        return R.string.menu_key_display;
+    }
+
+    @Override
+    public void displayPreference(PreferenceScreen screen) {
+        super.displayPreference(screen);
+    }
+}