From 168c4ac708f5be1039d7ea0667dd5ec7f7dc7d78 Mon Sep 17 00:00:00 2001
From: Glavo <zjx001202@gmail.com>
Date: Mon, 29 Sep 2025 16:51:57 +0800
Subject: [PATCH] =?UTF-8?q?=E6=94=AF=E6=8C=81=E9=80=9A=E8=BF=87=E7=8E=AF?=
 =?UTF-8?q?=E5=A2=83=E5=8F=98=E9=87=8F=E6=8E=A7=E5=88=B6=20UI=20=E7=BC=A9?=
 =?UTF-8?q?=E6=94=BE=E6=AF=94=E4=BE=8B=20(#4521)?=
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---
 .../java/org/jackhuang/hmcl/EntryPoint.java   | 81 +++++++++++++++----
 1 file changed, 66 insertions(+), 15 deletions(-)

diff --git a/HMCL/src/main/java/org/jackhuang/hmcl/EntryPoint.java b/HMCL/src/main/java/org/jackhuang/hmcl/EntryPoint.java
index 396c880f7..dc8ba26d8 100644
--- a/HMCL/src/main/java/org/jackhuang/hmcl/EntryPoint.java
+++ b/HMCL/src/main/java/org/jackhuang/hmcl/EntryPoint.java
@@ -46,21 +46,7 @@ public final class EntryPoint {
         createHMCLDirectories();
         LOG.start(Metadata.HMCL_CURRENT_DIRECTORY.resolve("logs"));
 
-        if ("true".equalsIgnoreCase(System.getenv("HMCL_FORCE_GPU")))
-            System.getProperties().putIfAbsent("prism.forceGPU", "true");
-
-        String animationFrameRate = System.getenv("HMCL_ANIMATION_FRAME_RATE");
-        if (animationFrameRate != null) {
-            try {
-                if (Integer.parseInt(animationFrameRate) <= 0)
-                    throw new NumberFormatException(animationFrameRate);
-
-                System.getProperties().putIfAbsent("javafx.animation.pulse", animationFrameRate);
-            } catch (NumberFormatException e) {
-                LOG.warning("Invalid animation frame rate: " + animationFrameRate);
-            }
-        }
-
+        setupJavaFXVMOptions();
         checkDirectoryPath();
 
         if (OperatingSystem.CURRENT_OS == OperatingSystem.MACOS)
@@ -80,6 +66,71 @@ public final class EntryPoint {
         System.exit(exitCode);
     }
 
+    private static void setupJavaFXVMOptions() {
+        if ("true".equalsIgnoreCase(System.getenv("HMCL_FORCE_GPU"))) {
+            LOG.info("HMCL_FORCE_GPU: true");
+            System.getProperties().putIfAbsent("prism.forceGPU", "true");
+        }
+
+        String animationFrameRate = System.getenv("HMCL_ANIMATION_FRAME_RATE");
+        if (animationFrameRate != null) {
+            LOG.info("HMCL_ANIMATION_FRAME_RATE: " + animationFrameRate);
+
+            try {
+                if (Integer.parseInt(animationFrameRate) <= 0)
+                    throw new NumberFormatException(animationFrameRate);
+
+                System.getProperties().putIfAbsent("javafx.animation.pulse", animationFrameRate);
+            } catch (NumberFormatException e) {
+                LOG.warning("Invalid animation frame rate: " + animationFrameRate);
+            }
+        }
+
+        String uiScale = System.getProperty("hmcl.uiScale", System.getenv("HMCL_UI_SCALE"));
+        if (uiScale != null) {
+            uiScale = uiScale.trim();
+
+            LOG.info("HMCL_UI_SCALE: " + uiScale);
+
+            try {
+                float scaleValue;
+                if (uiScale.endsWith("%")) {
+                    scaleValue = Integer.parseInt(uiScale.substring(0, uiScale.length() - 1)) / 100.0f;
+                } else if (uiScale.endsWith("dpi") || uiScale.endsWith("DPI")) {
+                    scaleValue = Integer.parseInt(uiScale.substring(0, uiScale.length() - 3)) / 96.0f;
+                } else {
+                    scaleValue = Float.parseFloat(uiScale);
+                }
+
+                float lowerBound;
+                float upperBound;
+
+                if (OperatingSystem.CURRENT_OS == OperatingSystem.WINDOWS) {
+                    // JavaFX behavior may be abnormal when the DPI scaling factor is too high
+                    lowerBound = 0.25f;
+                    upperBound = 4f;
+                } else {
+                    lowerBound = 0.01f;
+                    upperBound = 10f;
+                }
+
+                if (scaleValue >= lowerBound && scaleValue <= upperBound) {
+                    if (OperatingSystem.CURRENT_OS == OperatingSystem.WINDOWS) {
+                        System.getProperties().putIfAbsent("glass.win.uiScale", uiScale);
+                    } else if (OperatingSystem.CURRENT_OS == OperatingSystem.MACOS) {
+                        LOG.warning("macOS does not support setting UI scale, so it will be ignored");
+                    } else {
+                        System.getProperties().putIfAbsent("glass.gtk.uiScale", uiScale);
+                    }
+                } else {
+                    LOG.warning("UI scale out of range: " + uiScale);
+                }
+            } catch (Throwable e) {
+                LOG.warning("Invalid UI scale: " + uiScale);
+            }
+        }
+    }
+
     private static void createHMCLDirectories() {
         if (!Files.isDirectory(Metadata.HMCL_CURRENT_DIRECTORY)) {
             try {