Allow display resolution adjustment when streaming at a native resolution

app/src/main/java/com/limelight/Game.java

@@ -630,6 +630,7 @@ public class Game extends Activity implements SurfaceHolder.Callback,
         // On M, we can explicitly set the optimal display mode
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
             Display.Mode bestMode = display.getMode();
+            boolean isNativeResolutionStream = PreferenceConfiguration.isNativeResolution(prefConfig.width, prefConfig.height);
             boolean refreshRateIsGood = isRefreshRateGoodMatch(bestMode.getRefreshRate());
             for (Display.Mode candidate : display.getSupportedModes()) {
                 boolean refreshRateReduced = candidate.getRefreshRate() < bestMode.getRefreshRate();
@@ -641,14 +642,15 @@ public class Game extends Activity implements SurfaceHolder.Callback,
                 LimeLog.info("Examining display mode: "+candidate.getPhysicalWidth()+"x"+
                         candidate.getPhysicalHeight()+"x"+candidate.getRefreshRate());
 
-                if (candidate.getPhysicalWidth() > 4096) {
+                if (candidate.getPhysicalWidth() > 4096 && prefConfig.width <= 4096) {
                     // Avoid resolutions options above 4K to be safe
                     continue;
                 }
 
                 // On non-4K streams, we force the resolution to never change unless it's above
-                // 60 FPS, which may require a resolution reduction due to HDMI bandwidth limitations.
-                if (prefConfig.width < 3840 && prefConfig.fps <= 60) {
+                // 60 FPS, which may require a resolution reduction due to HDMI bandwidth limitations,
+                // or it's a native resolution stream.
+                if (prefConfig.width < 3840 && prefConfig.fps <= 60 && !isNativeResolutionStream) {
                     if (display.getMode().getPhysicalWidth() != candidate.getPhysicalWidth() ||
                             display.getMode().getPhysicalHeight() != candidate.getPhysicalHeight()) {
                         continue;

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

@@ -109,6 +109,30 @@ public class PreferenceConfiguration {
     public boolean touchscreenTrackpad;
     public MoonBridge.AudioConfiguration audioConfiguration;
 
+    public static boolean isNativeResolution(int width, int height) {
+        // It's not a native resolution if it matches an existing resolution option
+        if (width == 640 && height == 360) {
+            return false;
+        }
+        else if (width == 854 && height == 480) {
+            return false;
+        }
+        else if (width == 1280 && height == 720) {
+            return false;
+        }
+        else if (width == 1920 && height == 1080) {
+            return false;
+        }
+        else if (width == 2560 && height == 1440) {
+            return false;
+        }
+        else if (width == 3840 && height == 2160) {
+            return false;
+        }
+
+        return true;
+    }
+
     private static String convertFromLegacyResolutionString(String resString) {
         if (resString.equalsIgnoreCase("360p")) {
             return RES_360P;

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

@@ -8,6 +8,8 @@
         <item>1440p</item>
         <item>4K</item>
     </string-array>
+
+    <!-- Keep this in sync with PreferenceConfiguration.isNativeResolution()! -->
     <string-array name="resolution_values" translatable="false">
         <item>640x360</item>
         <item>854x480</item>