From d98a483a878c6cd9eafd6b4617f56d7dee47207d Mon Sep 17 00:00:00 2001
From: Evan Debenham <Evan@ShatteredPixel.com>
Date: Thu, 20 Mar 2025 12:52:42 -0400
Subject: [PATCH] v3.0.2: fixed a display scaling error on Steam Deck

---
 .../src/main/java/com/watabou/noosa/Game.java   | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/SPD-classes/src/main/java/com/watabou/noosa/Game.java b/SPD-classes/src/main/java/com/watabou/noosa/Game.java
index 5289d67c9..7d95a5685 100644
--- a/SPD-classes/src/main/java/com/watabou/noosa/Game.java
+++ b/SPD-classes/src/main/java/com/watabou/noosa/Game.java
@@ -93,12 +93,25 @@ public class Game implements ApplicationListener {
 	
 	@Override
 	public void create() {
+		dispHeight = Gdx.graphics.getDisplayMode().height;
+		dispWidth = Gdx.graphics.getDisplayMode().width;
+
 		density = Gdx.graphics.getDensity();
 		if (density == Float.POSITIVE_INFINITY){
 			density = 100f / 160f; //assume 100PPI if density can't be found
+		} else if (DeviceCompat.isDesktop()) {
+			float PpiX = Gdx.graphics.getPpiX();
+			float PpiY = Gdx.graphics.getPpiY();
+
+			//this exists because Steam deck reports its display size as 4"x6.3" for some reason
+			// as if in portrait, instead of 6.3"x4". This results in incorrect PPI measurements.
+			// So when the PPIs differ, we assume reported display size is flipped and adjust
+			if (PpiX / PpiY > 1.1f || PpiX / PpiY < 0.9f ){
+				float reportedDisplayHeightInches = dispHeight / PpiY; //it's actually the width
+				float realPpiX = dispWidth / reportedDisplayHeightInches;
+				density = realPpiX / 160f;
+			}
 		}
-		dispHeight = Gdx.graphics.getDisplayMode().height;
-		dispWidth = Gdx.graphics.getDisplayMode().width;
 
 		inputHandler = new InputHandler( Gdx.input );
 		if (ControllerHandler.controllersSupported()){