Make the name table optional (#17306)

src/Avalonia.Base/Media/Fonts/Tables/Name/NameTable.cs

@@ -98,11 +98,11 @@ namespace Avalonia.Media.Fonts.Tables.Name
         public string GetNameById(ushort culture, ushort nameId)
             => GetNameById(culture, (KnownNameIds)nameId);
 
-        public static NameTable Load(IGlyphTypeface glyphTypeface)
+        public static NameTable? Load(IGlyphTypeface glyphTypeface)
         {
             if (!glyphTypeface.TryGetTable(Tag, out var table))
             {
-                throw new MissingFontTableException("Could not load table", "name");
+                return null;
             }
 
             using var stream = new MemoryStream(table);

src/Skia/Avalonia.Skia/GlyphTypefaceImpl.cs

@@ -17,7 +17,7 @@ namespace Avalonia.Skia
     {
         private bool _isDisposed;
         private readonly SKTypeface _typeface;
-        private readonly NameTable _nameTable;
+        private readonly NameTable? _nameTable;
         private readonly OS2Table? _os2Table;
         private readonly HorizontalHeadTable? _hhTable;
         private IReadOnlyList<OpenTypeTag>? _supportedFeatures;
@@ -100,18 +100,26 @@ namespace Avalonia.Skia
 
             _nameTable = NameTable.Load(this);
 
-            TypographicFamilyName = _nameTable.GetNameById((ushort)CultureInfo.InvariantCulture.LCID, KnownNameIds.TypographicFamilyName);
+            //Rely on Skia if no name table is present
+            FamilyName = _nameTable?.FontFamilyName((ushort)CultureInfo.InvariantCulture.LCID) ?? typeface.FamilyName;
 
-            FamilyName = _nameTable.FontFamilyName((ushort)CultureInfo.InvariantCulture.LCID);
+            TypographicFamilyName = _nameTable?.GetNameById((ushort)CultureInfo.InvariantCulture.LCID, KnownNameIds.TypographicFamilyName) ?? FamilyName;
 
-            var familyNames = new Dictionary<ushort, string>(_nameTable.Languages.Count);
+            if(_nameTable != null)
+            {
+                var familyNames = new Dictionary<ushort, string>(_nameTable.Languages.Count);
+
+                foreach (var language in _nameTable.Languages)
+                {
+                    familyNames.Add(language, _nameTable.FontFamilyName(language));
+                }
 
-            foreach (var language in _nameTable.Languages)
+                FamilyNames = familyNames;
+            }
+            else
             {
-                familyNames.Add(language, _nameTable.FontFamilyName(language));
+                FamilyNames = new Dictionary<ushort, string> { { (ushort)CultureInfo.InvariantCulture.LCID, FamilyName } };
             }
-
-            FamilyNames = familyNames;
         }
 
         public string TypographicFamilyName { get; }