From 1b032b7975f1820bee077babe5a44885532b5b97 Mon Sep 17 00:00:00 2001
From: hneemann <helmut.neemann@arcor.de>
Date: Wed, 7 Jun 2017 13:36:07 +0200
Subject: [PATCH] added a plausibility check to the dpi calculation

---
 .../java/de/neemann/digital/core/element/Keys.java    | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/src/main/java/de/neemann/digital/core/element/Keys.java b/src/main/java/de/neemann/digital/core/element/Keys.java
index c7fcaae1d..4da7eaafa 100644
--- a/src/main/java/de/neemann/digital/core/element/Keys.java
+++ b/src/main/java/de/neemann/digital/core/element/Keys.java
@@ -372,7 +372,16 @@ public final class Keys {
 
     private static int getDefaultScreenResolution() {
         try {
-            return Toolkit.getDefaultToolkit().getScreenResolution();
+            int dpi = Toolkit.getDefaultToolkit().getScreenResolution();
+
+            // plausibility check
+            int widthInPixel = Toolkit.getDefaultToolkit().getScreenSize().width;
+            int widthInInch = widthInPixel / dpi;
+            // most people don't use a screen larger than 27 inch, so the resolution is presumably wrong
+            if (widthInInch > 27)
+                dpi = widthInPixel / 27;
+
+            return dpi;
         } catch (HeadlessException e) {
             return 95;
         }