Add a config setting for the game applet's size

runelite-client/src/main/java/net/runelite/client/RuneLite.java

@@ -140,6 +140,7 @@ public class RuneLite
 		eventBus.register(overlayRenderer);
 		eventBus.register(menuManager);
 		eventBus.register(chatMessageManager);
+		eventBus.register(gui);
 
 		// Setup the notifier
 		notifier = new Notifier(properties.getTitle(), gui.getTrayIcon());
@@ -161,7 +162,19 @@ public class RuneLite
 		// Load the session, including saved configuration
 		sessionManager.loadSession();
 
-		SwingUtilities.invokeAndWait(() -> gui.showWithChrome(runeliteConfig.enableCustomChrome()));
+		SwingUtilities.invokeAndWait(() ->
+		{
+			if (client != null)
+			{
+				client.setSize(runeliteConfig.gameSize());
+				client.setPreferredSize(runeliteConfig.gameSize());
+
+				client.getParent().setPreferredSize(runeliteConfig.gameSize());
+				client.getParent().setSize(runeliteConfig.gameSize());
+			}
+
+			gui.showWithChrome(runeliteConfig.enableCustomChrome());
+		});
 
 		eventBus.post(new ClientUILoaded());
 	}

runelite-client/src/main/java/net/runelite/client/config/RuneLiteConfig.java

@@ -24,6 +24,8 @@
  */
 package net.runelite.client.config;
 
+import java.awt.Dimension;
+
 @ConfigGroup(
 	keyName = "runelite",
 	name = "RuneLite",
@@ -31,6 +33,16 @@ package net.runelite.client.config;
 )
 public interface RuneLiteConfig extends Config
 {
+	@ConfigItem(
+		keyName = "gameSize",
+		name = "Game size",
+		description = "The game will resize to this resolution upon starting the client"
+	)
+	default Dimension gameSize()
+	{
+		return new Dimension(765, 503);
+	}
+
 	@ConfigItem(
 		keyName = "chatCommandsRecolorEnabled",
 		name = "Enable chat commands recolor",

runelite-client/src/main/java/net/runelite/client/plugins/config/ConfigPanel.java

@@ -28,7 +28,6 @@ import java.awt.BorderLayout;
 import java.awt.Color;
 import java.awt.Component;
 import java.awt.Dimension;
-import java.awt.event.ActionEvent;
 import java.awt.event.FocusEvent;
 import java.awt.event.FocusListener;
 import java.awt.event.ItemEvent;

runelite-client/src/main/java/net/runelite/client/ui/ClientUI.java

@@ -61,10 +61,12 @@ import javax.swing.ToolTipManager;
 import javax.swing.UIManager;
 import javax.swing.UnsupportedLookAndFeelException;
 import javax.swing.plaf.FontUIResource;
+import com.google.common.eventbus.Subscribe;
 import lombok.Getter;
 import lombok.extern.slf4j.Slf4j;
 import net.runelite.api.Client;
 import net.runelite.api.GameState;
+import net.runelite.api.events.ConfigChanged;
 import net.runelite.client.RuneLiteProperties;
 import org.pushingpixels.substance.api.skin.SubstanceGraphiteLookAndFeel;
 import org.pushingpixels.substance.internal.SubstanceSynapse;
@@ -250,6 +252,52 @@ public class ClientUI extends JFrame
 		repaint();
 	}
 
+	@Subscribe
+	public void onConfigChanged(ConfigChanged event)
+	{
+		if (!event.getGroup().equals("runelite"))
+		{
+			return;
+		}
+
+		if (!event.getKey().equals("gameSize"))
+		{
+			return;
+		}
+
+		if (client == null)
+		{
+			return;
+		}
+
+		String[] splitStr = event.getNewValue().split("x");
+		int width = Integer.parseInt(splitStr[0]);
+		int height = Integer.parseInt(splitStr[1]);
+
+		// The upper bounds are defined by the applet's max size
+		// The lower bounds are taken care of by ClientPanel's setMinimumSize
+
+		if (width > 7680)
+		{
+			width = 7680;
+		}
+
+		if (height > 2160)
+		{
+			height = 2160;
+		}
+
+		Dimension size = new Dimension(width, height);
+
+		client.setSize(size);
+		client.setPreferredSize(size);
+
+		client.getParent().setPreferredSize(size);
+		client.getParent().setSize(size);
+
+		pack();
+	}
+
 	private static void setUIFont(FontUIResource f)
 	{
 		final Enumeration keys = UIManager.getDefaults().keys();