1 files changed, 73 insertions, 0 deletions
diff --git a/mkvtool-gui/CustomFontManagerImpl.cs b/mkvtool-gui/CustomFontManagerImpl.cs
new file mode 100644
index 0000000..c47fedb
--- /dev/null
+++ b/mkvtool-gui/CustomFontManagerImpl.cs
@@ -0,0 +1,73 @@
+using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
+using Avalonia.Media;
+using Avalonia.Platform;
+using Avalonia.Skia;
+using SkiaSharp;
+
+namespace mkvtool
+{
+    public class CustomFontManagerImpl : IFontManagerImpl
+    {
+        private readonly Typeface[] _customTypefaces;
+        private readonly string _defaultFamilyName;
+
+        private readonly Typeface _defaultTypeface =
+            new Typeface("Microsoft Yahei");
+
+        public CustomFontManagerImpl()
+        {
+            _customTypefaces = new[] {_defaultTypeface};
+            _defaultFamilyName = _defaultTypeface.FontFamily.FamilyNames.PrimaryFamilyName;
+        }
+
+        public string GetDefaultFontFamilyName()
+        {
+            return _defaultFamilyName;
+        }
+
+        public IEnumerable<string> GetInstalledFontFamilyNames(bool checkForUpdates = false)
+        {
+            return _customTypefaces.Select(x => x.FontFamily.Name);
+        }
+
+        private readonly string[] _bcp47 =
+        {
+            CultureInfo.CurrentCulture.ThreeLetterISOLanguageName, CultureInfo.CurrentCulture.TwoLetterISOLanguageName
+        };
+
+        public bool TryMatchCharacter(int codepoint, FontStyle fontStyle, FontWeight fontWeight, FontFamily fontFamily,
+            CultureInfo culture, out Typeface typeface)
+        {
+            foreach (var customTypeface in _customTypefaces)
+            {
+                if (customTypeface.GlyphTypeface.GetGlyph((uint) codepoint) == 0)
+                {
+                    continue;
+                }
+
+                typeface = new Typeface(customTypeface.FontFamily.Name, fontStyle, fontWeight);
+
+                return true;
+            }
+
+            var fallback = SKFontManager.Default.MatchCharacter(fontFamily?.Name, (SKFontStyleWeight) fontWeight,
+                SKFontStyleWidth.Normal, (SKFontStyleSlant) fontStyle, _bcp47, codepoint);
+
+            typeface = new Typeface(fallback?.FamilyName ?? _defaultFamilyName, fontStyle, fontWeight);
+
+            return true;
+        }
+
+        public IGlyphTypefaceImpl CreateGlyphTypeface(Typeface typeface)
+        {
+            SKTypeface skTypeface;
+            skTypeface = SKTypeface.FromFamilyName(_defaultTypeface.FontFamily.Name,
+                (SKFontStyleWeight) typeface.Weight, SKFontStyleWidth.Normal, (SKFontStyleSlant) typeface.Style);
+
+
+            return new GlyphTypefaceImpl(skTypeface);
+        }
+    }
+}
+\ No newline at end of file