fix: use the correct font family for CJK characters

See merge request ryubing/ryujinx!52

CHANGELOG.md

@@ -2,20 +2,17 @@
 
 All updates to this Ryujinx branch will be documented in this file.
 
+## [1.3.2](<https://git.ryujinx.app/ryubing/ryujinx/-/releases/1.3.2>) - 2025-06-09
+
 ## [1.3.1](<https://git.ryujinx.app/ryubing/ryujinx/-/releases/1.3.1>) - 2025-04-23
-A list of notable changes can be found on the release linked in the version number above.
 
 ## [1.2.86](<https://github.com/Ryubing/Stable-Releases/releases/tag/1.2.86>) - 2025-03-13
-A list of notable changes can be found on the release linked in the version number above.
 
 ## [1.2.82](<https://web.archive.org/web/20250312010534/https://github.com/Ryubing/Ryujinx/releases/tag/1.2.82>) - 2025-02-16
-A list of notable changes can be found on the release linked in the version number above.
 
 ## [1.2.80-81](<https://web.archive.org/web/20250302064257/https://github.com/Ryubing/Ryujinx/releases/tag/1.2.81>) - 2025-01-22
-A list of notable changes can be found on the release linked in the version number above.
 
 ## [1.2.78](<https://web.archive.org/web/20250301174537/https://github.com/Ryubing/Ryujinx/releases/tag/1.2.78>) - 2024-12-19
-A list of notable changes can be found on the release linked in the version number above.
 
 ## [1.2.73-1.2.76](<https://web.archive.org/web/20250209202612/https://github.com/Ryubing/Ryujinx/releases/tag/1.2.76>) - 2024-11-19
 A list of notable changes can be found on the release linked in the version number above.
@@ -254,4 +251,4 @@ Added Low-power PPTC mode strings to the translation files.
 - Autoload DLC/Updates from dir ([#12](https://github.com/GreemDev/Ryujinx/pull/12)).
 - Changed executable icon to rainbow logo.
 - Extract Data > Logo now also extracts the square thumbnail you see for the game in the UI. 
-- The "use random UUID hack" checkbox in the Amiibo screen now remembers its last state when you reopen the window in a given session.
+- The "use random UUID hack" checkbox in the Amiibo screen now remembers its last state when you reopen the window in a given session.

src/Ryujinx/UI/Applet/AvaloniaHostUITheme.cs

@@ -2,29 +2,104 @@ using Avalonia.Media;
 using Ryujinx.Ava.UI.Windows;
 using Ryujinx.HLE.UI;
 using System;
+using System.Globalization;
 
 namespace Ryujinx.Ava.UI.Applet
 {
-    class AvaloniaHostUITheme(MainWindow parent) : IHostUITheme
+    class AvaloniaHostUITheme : IHostUITheme
     {
-        public string FontFamily { get; } = OperatingSystem.IsWindows() && OperatingSystem.IsWindowsVersionAtLeast(10, 0, 22000) ? "Segoe UI Variable" : parent.FontFamily.Name;
+        private readonly MainWindow _parent;
 
-        public ThemeColor DefaultBackgroundColor { get; } = BrushToThemeColor(parent.Background);
-        public ThemeColor DefaultForegroundColor { get; } = BrushToThemeColor(parent.Foreground);
-        public ThemeColor DefaultBorderColor { get; } = BrushToThemeColor(parent.BorderBrush);
-        public ThemeColor SelectionBackgroundColor { get; } = BrushToThemeColor(parent.ViewControls.SearchBox.SelectionBrush);
-        public ThemeColor SelectionForegroundColor { get; } = BrushToThemeColor(parent.ViewControls.SearchBox.SelectionForegroundBrush);
+        public string FontFamily { get; }
+        public ThemeColor DefaultBackgroundColor { get; }
+        public ThemeColor DefaultForegroundColor { get; }
+        public ThemeColor DefaultBorderColor { get; }
+        public ThemeColor SelectionBackgroundColor { get; }
+        public ThemeColor SelectionForegroundColor { get; }
+
+        public AvaloniaHostUITheme(MainWindow parent)
+        {
+            _parent = parent;
+
+            // Initialize font property
+            FontFamily = GetSystemFontFamily();
+
+            // Initialize all properties that depend on parent
+            DefaultBackgroundColor = BrushToThemeColor(parent.Background);
+            DefaultForegroundColor = BrushToThemeColor(parent.Foreground);
+            DefaultBorderColor = BrushToThemeColor(parent.BorderBrush);
+            SelectionBackgroundColor = BrushToThemeColor(parent.ViewControls.SearchBox.SelectionBrush);
+            SelectionForegroundColor = BrushToThemeColor(parent.ViewControls.SearchBox.SelectionForegroundBrush);
+        }
+
+        private string GetSystemFontFamily()
+        {
+            if (OperatingSystem.IsWindows())
+            {
+                return GetWindowsFontByLanguage();
+            }
+            else if (OperatingSystem.IsMacOS())
+            {
+                return GetMacOSFontByLanguage();
+            }
+            else // Linux and other platforms
+            {
+                return GetLinuxFontByLanguage();
+            }
+        }
+
+        private string GetWindowsFontByLanguage()
+        {
+            var culture = CultureInfo.CurrentUICulture;
+            string langCode = culture.Name;
+
+            return culture.TwoLetterISOLanguageName switch
+            {
+                "zh" => langCode == "zh-CN" || langCode == "zh-Hans" || langCode == "zh-SG"
+                    ? "Microsoft YaHei UI"  // Simplified Chinese
+                    : "Microsoft JhengHei UI", // Traditional Chinese
+
+                "ja" => "Yu Gothic UI",     // Japanese
+                "ko" => "Malgun Gothic",     // Korean
+                _ => OperatingSystem.IsWindowsVersionAtLeast(10, 0, 22000)
+                    ? "Segoe UI Variable"   // Other languages - Windows 11+
+                    : _parent.FontFamily.Name // Fallback to parent window font
+            };
+        }
+
+        private string GetMacOSFontByLanguage()
+        {
+            return CultureInfo.CurrentUICulture.TwoLetterISOLanguageName switch
+            {
+                "zh" => "PingFang SC",      // Chinese (both simplified and traditional)
+                "ja" => "Hiragino Sans",    // Japanese
+                "ko" => "Apple SD Gothic Neo", // Korean
+                _ => _parent.FontFamily.Name // Fallback to parent window font
+            };
+        }
+
+        private string GetLinuxFontByLanguage()
+        {
+            return CultureInfo.CurrentUICulture.TwoLetterISOLanguageName switch
+            {
+                "zh" => "Noto Sans CJK SC", // Chinese
+                "ja" => "Noto Sans CJK JP", // Japanese
+                "ko" => "Noto Sans CJK KR", // Korean
+                _ => _parent.FontFamily.Name // Fallback to parent window font
+            };
+        }
 
         private static ThemeColor BrushToThemeColor(IBrush brush)
         {
             if (brush is SolidColorBrush solidColor)
             {
-                return new ThemeColor((float)solidColor.Color.A / 255,
+                return new ThemeColor(
+                    (float)solidColor.Color.A / 255,
                     (float)solidColor.Color.R / 255,
                     (float)solidColor.Color.G / 255,
-                    (float)solidColor.Color.B / 255);
+                    (float)solidColor.Color.B / 255
+                );
             }
-
             return new ThemeColor();
         }
     }