From 7f86eda904ee35a0707ee2c2da40cd916c339b00 Mon Sep 17 00:00:00 2001
From: oliver <oliverxiaozhen@outlook.com>
Date: Sat, 9 May 2026 19:54:56 +0800
Subject: [PATCH] =?UTF-8?q?fix:=20=E8=87=AA=E5=8A=A8=E7=BB=A7=E6=89=BF=20Q?=
 =?UTF-8?q?T=5FSCALE=5FFACTOR=20=E4=BB=A5=E4=BF=AE=E5=A4=8D=20Wayland=20?=
 =?UTF-8?q?=E4=B8=8B=20JavaFX=20=E7=BC=A9=E6=94=BE=E9=97=AE=E9=A2=98?=
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---
 HMCL/src/main/resources/assets/HMCLauncher.sh | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/HMCL/src/main/resources/assets/HMCLauncher.sh b/HMCL/src/main/resources/assets/HMCLauncher.sh
index 1dfff645905..ddef16ad730 100644
--- a/HMCL/src/main/resources/assets/HMCLauncher.sh
+++ b/HMCL/src/main/resources/assets/HMCLauncher.sh
@@ -55,9 +55,18 @@ fi
 
 # _HMCL_VM_OPTIONS
 if [ -n "${HMCL_JAVA_OPTS+x}" ]; then
+  # User-specified JVM options take precedence.
   _HMCL_VM_OPTIONS=${HMCL_JAVA_OPTS}
 else
   _HMCL_VM_OPTIONS="-XX:MinHeapFreeRatio=5 -XX:MaxHeapFreeRatio=15"
+
+  # JavaFX may not respect KDE Plasma Wayland fractional scaling automatically.
+  # Bridge QT_SCALE_FACTOR to JavaFX's GTK UI scale when available.
+  if [ "$_HMCL_OS" = "linux" ] && [ "$XDG_SESSION_TYPE" = "wayland" ]; then
+    if [ -n "$QT_SCALE_FACTOR" ]; then
+      _HMCL_VM_OPTIONS="$_HMCL_VM_OPTIONS -Dglass.gtk.uiScale=$QT_SCALE_FACTOR"
+    fi
+  fi
 fi
 
 function show_warning_console() {