Exclude HDR toggle when the device doesn't support it

app/src/main/java/com/limelight/preferences/StreamSettings.java

@@ -2,6 +2,7 @@ package com.limelight.preferences;
 
 import android.content.Intent;
 import android.content.SharedPreferences;
+import android.os.Build;
 import android.os.Bundle;
 import android.app.Activity;
 import android.preference.Preference;
@@ -9,7 +10,9 @@ import android.preference.PreferenceCategory;
 import android.preference.PreferenceFragment;
 import android.preference.PreferenceManager;
 import android.preference.PreferenceScreen;
+import android.view.Display;
 
+import com.limelight.LimeLog;
 import com.limelight.PcView;
 import com.limelight.R;
 import com.limelight.utils.UiHelper;
@@ -65,6 +68,33 @@ public class StreamSettings extends Activity {
                 screen.removePreference(category);
             }
 
+            // Remove HDR preference for devices below Nougat
+            if (Build.VERSION.SDK_INT < Build.VERSION_CODES.N) {
+                LimeLog.info("Excluding HDR toggle based on OS");
+                PreferenceCategory category =
+                        (PreferenceCategory) findPreference("category_advanced_settings");
+                category.removePreference(findPreference("checkbox_enable_hdr"));
+            }
+            else {
+                Display display = getActivity().getWindowManager().getDefaultDisplay();
+                Display.HdrCapabilities hdrCaps = display.getHdrCapabilities();
+
+                // We must now ensure our display is compatible with HDR10
+                boolean foundHdr10 = false;
+                for (int hdrType : hdrCaps.getSupportedHdrTypes()) {
+                    if (hdrType == Display.HdrCapabilities.HDR_TYPE_HDR10) {
+                        foundHdr10 = true;
+                    }
+                }
+
+                if (!foundHdr10) {
+                    LimeLog.info("Excluding HDR toggle based on display capabilities");
+                    PreferenceCategory category =
+                            (PreferenceCategory) findPreference("category_advanced_settings");
+                    category.removePreference(findPreference("checkbox_enable_hdr"));
+                }
+            }
+
             // Add a listener to the FPS and resolution preference
             // so the bitrate can be auto-adjusted
             Preference pref = findPreference(PreferenceConfiguration.RES_FPS_PREF_STRING);

app/src/main/res/values/strings.xml

@@ -149,6 +149,6 @@
     <string name="title_video_format">Change H.265 settings</string>
     <string name="summary_video_format">H.265 lowers video bandwidth requirements but requires a very recent device</string>
     <string name="title_enable_hdr">Enable HDR (Experimental)</string>
-    <string name="summary_enable_hdr">Stream HDR when the game, client display, decoder, and GPU support it</string>
+    <string name="summary_enable_hdr">Stream HDR when the game and PC GPU support it. HDR requires a GTX 1000 series GPU or later.</string>
 
 </resources>

app/src/main/res/xml/preferences.xml

@@ -96,7 +96,8 @@
             android:summary="@string/summary_checkbox_list_mode"
             android:defaultValue="false" />
     </PreferenceCategory>
-    <PreferenceCategory android:title="@string/category_advanced_settings">
+    <PreferenceCategory android:title="@string/category_advanced_settings"
+        android:key="category_advanced_settings">
         <ListPreference
             android:key="video_format"
             android:title="@string/title_video_format"