Requested changes

src/Avalonia.Base/Platform/IAssetLoader.cs

@@ -59,13 +59,13 @@ namespace Avalonia.Platform
         /// <exception cref="FileNotFoundException">
         /// The resource was not found.
         /// </exception>
-        (Stream Stream, Assembly Assembly) OpenAndGetAssembly(Uri uri, Uri baseUri = null);
+        (Stream stream, Assembly assembly) OpenAndGetAssembly(Uri uri, Uri baseUri = null);
 
         /// <summary>
         /// Gets all assets at a specific location.
         /// </summary>
-        /// <param name="location">The location of resources.</param>
+        /// <param name="location">The location of assets.</param>
         /// <returns>A tuple containing the absolute path to the resource and the owner assembly</returns>
-        IEnumerable<(string AbsolutePath, Assembly Assembly)> GetAssets(Uri location);
+        IEnumerable<(string absolutePath, Assembly assembly)> GetAssets(Uri location);
     }
 }

src/Avalonia.Visuals/Media/FontFamily.cs

@@ -8,10 +8,8 @@ using Avalonia.Media.Fonts;
 
 namespace Avalonia.Media
 {
-    public class FontFamily
+    public class FontFamily : IFontFamily
     {
-        public static FontFamily Default => new FontFamily("Courier New");
-
         /// <summary>
         /// Initializes a new instance of the <see cref="T:Avalonia.Media.FontFamily" /> class.
         /// </summary>
@@ -47,56 +45,25 @@ namespace Avalonia.Media
             Key = new FontFamilyKey(source);
         }
 
-        /// <summary>
-        /// Gets the name of the font family.
-        /// </summary>
-        /// <value>
-        /// The name of the font family.
-        /// </value>
+        public static FontFamily Default => new FontFamily("Courier New");
+
         public string Name => FamilyNames.PrimaryFamilyName;
+      
+        FamilyNameCollection IFontFamily.FamilyNames => FamilyNames;
 
-        /// <summary>
-        /// Gets the family names.
-        /// </summary>
-        /// <value>
-        /// The family familyNames.
-        /// </value>
-        internal FamilyNameCollection FamilyNames
-        {
-            get;
-        }
+        FontFamilyKey IFontFamily.Key => Key;
 
-        /// <summary>
-        /// Gets the key for associated assets.
-        /// </summary>
-        /// <value>
-        /// The family familyNames.
-        /// </value>
-        internal FontFamilyKey Key { get; }
+        internal FamilyNameCollection FamilyNames { get; }
 
-        /// <summary>
-        /// Returns a <see cref="string" /> that represents this instance.
-        /// </summary>
-        /// <returns>
-        /// A <see cref="string" /> that represents this instance.
-        /// </returns>
-        public override string ToString()
-        {
-            if (Key != null)
-            {
-                return Key + "#" + Name;
-            }
-
-            return Name;
-        }
+        internal FontFamilyKey Key { get; }
 
         /// <summary>
-        /// Implicit conversion of FontFamily to string
+        /// Implicit conversion of string to FontFamily
         /// </summary>
         /// <param name="fontFamily"></param>
-        public static implicit operator string(FontFamily fontFamily)
+        public static implicit operator FontFamily(string fontFamily)
         {
-            return fontFamily.ToString();
+            return new FontFamily(fontFamily);
         }
 
         /// <summary>
@@ -116,21 +83,74 @@ namespace Avalonia.Media
             switch (segments.Length)
             {
                 case 1:
-                {
-                    var names = segments[0].Split(',')
-                        .Select(x => x.Trim())
-                        .Where(x => !string.IsNullOrWhiteSpace(x));
+                    {
+                        var names = segments[0].Split(',')
+                            .Select(x => x.Trim())
+                            .Where(x => !string.IsNullOrWhiteSpace(x));
                         return new FontFamily(names);
                     }
+
                 case 2:
                     {
                         return new FontFamily(segments[1], new Uri(segments[0], UriKind.RelativeOrAbsolute));
                     }
+
                 default:
                     {
                         throw new ArgumentException("Specified family is not supported.");
                     }
             }
         }
+
+        /// <summary>
+        /// Returns a <see cref="string" /> that represents this instance.
+        /// </summary>
+        /// <returns>
+        /// A <see cref="string" /> that represents this instance.
+        /// </returns>
+        public override string ToString()
+        {
+            if (Key != null)
+            {
+                return Key + "#" + FamilyNames;
+            }
+
+            return FamilyNames.ToString();
+        }
+
+        /// <summary>
+        /// Returns a hash code for this instance.
+        /// </summary>
+        /// <returns>
+        /// A hash code for this instance, suitable for use in hashing algorithms and data structures like a hash table. 
+        /// </returns>
+        public override int GetHashCode()
+        {
+            unchecked
+            {
+                var hash = (int)2186146271;
+
+                hash = (hash * 15768619) ^ FamilyNames.GetHashCode();
+
+                if (Key != null)
+                {
+                    hash = (hash * 15768619) ^ Key.GetHashCode();
+                }
+
+                return hash;
+            }
+        }
+
+        public override bool Equals(object obj)
+        {
+            if (!(obj is FontFamily other)) return false;
+
+            if (Key != null)
+            {
+                return other.FamilyNames.Equals(FamilyNames) && other.Key.Equals(Key);
+            }
+
+            return other.FamilyNames.Equals(FamilyNames);
+        }
     }
 }

src/Avalonia.Visuals/Media/Fonts/FamilyNameCollection.cs

@@ -9,10 +9,10 @@ using System.Linq;
 
 namespace Avalonia.Media.Fonts
 {
-    internal class FamilyNameCollection : IEnumerable<string>
-    {
-        private readonly ReadOnlyCollection<string> _familyNames;
+    using System.Text;
 
+    public class FamilyNameCollection : IEnumerable<string>
+    {    
         /// <summary>
         /// Initializes a new instance of the <see cref="FamilyNameCollection"/> class.
         /// </summary>
@@ -26,11 +26,11 @@ namespace Avalonia.Media.Fonts
 
             if (names.Count == 0) throw new ArgumentException($"{nameof(familyNames)} must not be empty.");
 
-            _familyNames = new ReadOnlyCollection<string>(names);
+            Names = new ReadOnlyCollection<string>(names);
 
-            PrimaryFamilyName = _familyNames.First();
+            PrimaryFamilyName = Names.First();
 
-            HasFallbacks = _familyNames.Count > 1;
+            HasFallbacks = Names.Count > 1;
         }
 
         /// <summary>
@@ -49,6 +49,14 @@ namespace Avalonia.Media.Fonts
         /// </value>
         public bool HasFallbacks { get; }
 
+        /// <summary>
+        /// Gets the internal collection of names.
+        /// </summary>
+        /// <value>
+        /// The names.
+        /// </value>
+        internal ReadOnlyCollection<string> Names { get; }
+
         /// <inheritdoc />
         /// <summary>
         /// Returns an enumerator that iterates through the collection.
@@ -58,7 +66,7 @@ namespace Avalonia.Media.Fonts
         /// </returns>
         public IEnumerator<string> GetEnumerator()
         {
-            return _familyNames.GetEnumerator();
+            return Names.GetEnumerator();
         }
 
         /// <inheritdoc />
@@ -72,5 +80,52 @@ namespace Avalonia.Media.Fonts
         {
             return GetEnumerator();
         }
+
+        /// <summary>
+        /// Returns a <see cref="string" /> that represents this instance.
+        /// </summary>
+        /// <returns>
+        /// A <see cref="string" /> that represents this instance.
+        /// </returns>
+        public override string ToString()
+        {
+            var builder = new StringBuilder();
+
+            for (var index = 0; index < Names.Count; index++)
+            {
+                builder.Append(Names[index]);
+
+                if (index == Names.Count - 1) break;
+
+                builder.Append(", ");
+            }
+
+            return builder.ToString();
+        }
+
+        /// <summary>
+        /// Returns a hash code for this instance.
+        /// </summary>
+        /// <returns>
+        /// A hash code for this instance, suitable for use in hashing algorithms and data structures like a hash table. 
+        /// </returns>
+        public override int GetHashCode()
+        {
+            return ToString().GetHashCode();
+        }
+
+        /// <summary>
+        /// Determines whether the specified <see cref="object" />, is equal to this instance.
+        /// </summary>
+        /// <param name="obj">The <see cref="object" /> to compare with this instance.</param>
+        /// <returns>
+        ///   <c>true</c> if the specified <see cref="object" /> is equal to this instance; otherwise, <c>false</c>.
+        /// </returns>
+        public override bool Equals(object obj)
+        {
+            if (!(obj is FamilyNameCollection other)) return false;
+
+            return other.ToString().Equals(ToString());
+        }
     }
 }

src/Avalonia.Visuals/Media/Fonts/FontAsset.cs

@@ -1,27 +0,0 @@
-// Copyright (c) The Avalonia Project. All rights reserved.
-// Licensed under the MIT license. See licence.md file in the project root for full license information.
-
-using System;
-
-namespace Avalonia.Media.Fonts
-{
-    internal class FontAsset
-    {
-        /// <summary>
-        /// Initializes a new instance of the <see cref="FontAsset"/> class.
-        /// </summary>
-        /// <param name="source">The source.</param>
-        public FontAsset(Uri source)
-        {
-            Source = source;
-        }
-
-        /// <summary>
-        /// Gets the source of the asset.
-        /// </summary>
-        /// <value>
-        /// The source.
-        /// </value>
-        public Uri Source { get; }
-    }
-}

src/Avalonia.Visuals/Media/Fonts/FontFamilyKey.cs

@@ -7,9 +7,9 @@ using System.Linq;
 namespace Avalonia.Media.Fonts
 {
     /// <summary>
-    /// Represents an idetifier for a <see cref="FontFamily"/>
+    /// Represents an identifier for a <see cref="IFontFamily"/>
     /// </summary>
-    internal class FontFamilyKey
+    public class FontFamilyKey
     {
         /// <summary>
         /// Creates a new instance of <see cref="FontFamilyKey"/> and extracts <see cref="Location"/> and <see cref="FileName"/> from given <see cref="Uri"/>
@@ -21,10 +21,10 @@ namespace Avalonia.Media.Fonts
 
             if (source.AbsolutePath.Contains(".ttf"))
             {
-                var filePathWithoutExtension = source.AbsolutePath.Replace(".ttf", "");
+                var filePathWithoutExtension = source.AbsolutePath.Replace(".ttf", string.Empty);
                 var fileNameWithoutExtension = filePathWithoutExtension.Split('.').Last();
                 FileName = fileNameWithoutExtension + ".ttf";
-                Location = new Uri(source.OriginalString.Replace("." + FileName, ""), UriKind.RelativeOrAbsolute);
+                Location = new Uri(source.OriginalString.Replace("." + FileName, string.Empty), UriKind.RelativeOrAbsolute);
             }
             else
             {
@@ -33,12 +33,12 @@ namespace Avalonia.Media.Fonts
         }
 
         /// <summary>
-        /// Location of stored <see cref="FontAsset"/> that belong to a <see cref="FontFamily"/>
+        /// Location of stored font asset that belongs to a <see cref="IFontFamily"/>
         /// </summary>
         public Uri Location { get; }
 
         /// <summary>
-        /// Optional filename for <see cref="FontAsset"/> that belong to a <see cref="FontFamily"/>
+        /// Optional filename for a font asset that belongs to a <see cref="IFontFamily"/>
         /// </summary>
         public string FileName { get; }
 

src/Avalonia.Visuals/Media/Fonts/FontFamilyLoader.cs

@@ -9,7 +9,7 @@ using Avalonia.Platform;
 
 namespace Avalonia.Media.Fonts
 {
-    internal static class FontFamilyLoader
+    public static class FontFamilyLoader
     {
         private static readonly IAssetLoader s_assetLoader;
 
@@ -18,7 +18,7 @@ namespace Avalonia.Media.Fonts
             s_assetLoader = AvaloniaLocator.Current.GetService<IAssetLoader>();
         }
 
-        public static IEnumerable<FontAsset> LoadFontAssets(FontFamilyKey fontFamilyKey)
+        public static IEnumerable<Uri> LoadFontAssets(FontFamilyKey fontFamilyKey)
         {
             return fontFamilyKey.FileName != null
                 ? GetFontAssetsByFileName(fontFamilyKey.Location, fontFamilyKey.FileName)
@@ -30,38 +30,33 @@ namespace Avalonia.Media.Fonts
         /// </summary>
         /// <param name="location"></param>
         /// <returns></returns>
-        private static IEnumerable<FontAsset> GetFontAssetsByLocation(Uri location)
+        private static IEnumerable<Uri> GetFontAssetsByLocation(Uri location)
         {
             var availableAssets = s_assetLoader.GetAssets(location);
 
             var locationPath = location.AbsolutePath;
 
-            var mathchingAssets = availableAssets.Where(x => x.AbsolutePath.Contains(locationPath) && x.AbsolutePath.EndsWith(".ttf"));
+            var matchingAssets = availableAssets.Where(x => x.absolutePath.Contains(locationPath) && x.absolutePath.EndsWith(".ttf"));
 
-            return mathchingAssets.Select(x => CreateFontAsset(GetAssetUri(x.AbsolutePath, x.Assembly)));
+            return matchingAssets.Select(x => GetAssetUri(x.absolutePath, x.assembly));
         }
 
         /// <summary>
         /// Searches for font assets at a given location and only accepts assets that fit to a given filename expression.
-        /// <para>Filenames can target multible files with * wildcard. For example "FontFile*.ttf"</para>
+        /// <para>File names can target multiple files with * wildcard. For example "FontFile*.ttf"</para>
         /// </summary>
         /// <param name="location"></param>
         /// <param name="fileName"></param>
         /// <returns></returns>
-        private static IEnumerable<FontAsset> GetFontAssetsByFileName(Uri location, string fileName)
+        private static IEnumerable<Uri> GetFontAssetsByFileName(Uri location, string fileName)
         {
             var availableResources = s_assetLoader.GetAssets(location);
 
             var compareTo = location.AbsolutePath + "." + fileName.Split('*').First();
 
-            var matchingResources = availableResources.Where(x => x.AbsolutePath.Contains(compareTo));
+            var matchingResources = availableResources.Where(x => x.absolutePath.Contains(compareTo));
 
-            return matchingResources.Select(x => CreateFontAsset(GetAssetUri(x.AbsolutePath, x.Assembly)));
-        }
-
-        private static FontAsset CreateFontAsset(Uri source)
-        {
-            return new FontAsset(source);
+            return matchingResources.Select(x => GetAssetUri(x.absolutePath, x.assembly));
         }
 
         /// <summary>

src/Avalonia.Visuals/Media/IFontFamily.cs

@@ -0,0 +1,35 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Avalonia.Media
+{
+    using Avalonia.Media.Fonts;
+
+    public interface IFontFamily
+    {
+        /// <summary>
+        /// Gets the name of the font family.
+        /// </summary>
+        /// <value>
+        /// The name of the font family.
+        /// </value>
+        string Name { get; }
+
+        /// <summary>
+        /// Gets the family names.
+        /// </summary>
+        /// <value>
+        /// The family familyNames.
+        /// </value>
+        FamilyNameCollection FamilyNames { get; }
+
+        /// <summary>
+        /// Gets the key for associated assets.
+        /// </summary>
+        /// <value>
+        /// The family familyNames.
+        /// </value>
+        FontFamilyKey Key { get; }
+    }
+}

src/Avalonia.Visuals/Media/Typeface.cs

@@ -14,8 +14,11 @@ namespace Avalonia.Media
         /// <param name="fontSize">The font size, in DIPs.</param>
         /// <param name="style">The font style.</param>
         /// <param name="weight">The font weight.</param>
-        public Typeface(FontFamily fontFamily, double fontSize = 12, FontStyle style = FontStyle.Normal,
-        FontWeight weight = FontWeight.Normal)
+        public Typeface(
+            IFontFamily fontFamily, 
+            double fontSize = 12, 
+            FontStyle style = FontStyle.Normal,
+            FontWeight weight = FontWeight.Normal)
         {
             if (fontSize <= 0)
             {
@@ -44,12 +47,15 @@ namespace Avalonia.Media
             string fontFamilyName,
             double fontSize = 12,
             FontStyle style = FontStyle.Normal,
-            FontWeight weight = FontWeight.Normal) : this(new FontFamily(fontFamilyName), fontSize, style, weight) { }
+            FontWeight weight = FontWeight.Normal)
+            : this(new FontFamily(fontFamilyName), fontSize, style, weight)
+        {
+        }
 
         /// <summary>
         /// Gets the font family.
         /// </summary>
-        public FontFamily FontFamily { get; }
+        public IFontFamily FontFamily { get; }
 
         /// <summary>
         /// Gets the size of the font in DIPs.

src/Avalonia.Visuals/Properties/AssemblyInfo.cs

@@ -10,7 +10,5 @@ using Avalonia.Metadata;
 [assembly: XmlnsDefinition("https://github.com/avaloniaui", "Avalonia.Media")]
 [assembly: XmlnsDefinition("https://github.com/avaloniaui", "Avalonia")]
 
-[assembly: InternalsVisibleTo("Avalonia.Direct2D1")]
 [assembly: InternalsVisibleTo("Avalonia.Direct2D1.RenderTests")]
-[assembly: InternalsVisibleTo("Avalonia.Skia")]
 [assembly: InternalsVisibleTo("Avalonia.Skia.RenderTests")]

src/Markup/Avalonia.Markup.Xaml/AvaloniaXamlLoader.cs

@@ -126,11 +126,11 @@ namespace Avalonia.Markup.Xaml
             }
 
             var asset = assetLocator.OpenAndGetAssembly(uri, baseUri);
-            using (var stream = asset.Stream)
+            using (var stream = asset.stream)
             {
                 try
                 {
-                    return Load(stream, asset.Assembly, rootInstance, uri);
+                    return Load(stream, asset.assembly, rootInstance, uri);
                 }
                 catch (Exception e)
                 {

src/Shared/PlatformSupport/AssetLoader.cs

@@ -67,7 +67,7 @@ namespace Avalonia.Shared.PlatformSupport
         /// <exception cref="FileNotFoundException">
         /// The resource was not found.
         /// </exception>
-        public Stream Open(Uri uri, Uri baseUri = null) => OpenAndGetAssembly(uri, baseUri).Stream;
+        public Stream Open(Uri uri, Uri baseUri = null) => OpenAndGetAssembly(uri, baseUri).stream;
 
         /// <summary>
         /// Opens the resource with the requested URI and returns the resource string and the
@@ -83,7 +83,7 @@ namespace Avalonia.Shared.PlatformSupport
         /// <exception cref="FileNotFoundException">
         /// The resource was not found.
         /// </exception>
-        public (Stream Stream, Assembly Assembly) OpenAndGetAssembly(Uri uri, Uri baseUri = null)
+        public (Stream stream, Assembly assembly) OpenAndGetAssembly(Uri uri, Uri baseUri = null)
         {
             var asset = GetAsset(uri, baseUri);
 
@@ -95,7 +95,7 @@ namespace Avalonia.Shared.PlatformSupport
             return (asset.GetStream(), asset.Assembly);
         }
 
-        public IEnumerable<(string AbsolutePath, Assembly Assembly)> GetAssets(Uri location)
+        public IEnumerable<(string absolutePath, Assembly assembly)> GetAssets(Uri location)
         {
             var assembly = GetAssembly(location);
 

src/Skia/Avalonia.Skia/SKTypefaceCollection.cs

@@ -6,7 +6,39 @@ namespace Avalonia.Skia
 {
     internal class SKTypefaceCollection
     {
-        struct FontKey
+       
+
+        private readonly ConcurrentDictionary<FontKey, SKTypeface> _cachedTypefaces =
+            new ConcurrentDictionary<FontKey, SKTypeface>();
+
+        public void AddTypeFace(SKTypeface typeface)
+        {
+            var key = new FontKey(typeface.FamilyName, (SKFontStyleWeight)typeface.FontWeight, typeface.FontSlant);
+
+            _cachedTypefaces.TryAdd(key, typeface);
+        }
+
+        public SKTypeface GetTypeFace(Typeface typeface)
+        {
+            SKFontStyleSlant skStyle = SKFontStyleSlant.Upright;
+
+            switch (typeface.Style)
+            {
+                case FontStyle.Italic:
+                    skStyle = SKFontStyleSlant.Italic;
+                    break;
+
+                case FontStyle.Oblique:
+                    skStyle = SKFontStyleSlant.Oblique;
+                    break;
+            }
+
+            var key = new FontKey(typeface.FontFamily.Name, (SKFontStyleWeight)typeface.Weight, skStyle);
+
+            return _cachedTypefaces.TryGetValue(key, out var skTypeface) ? skTypeface : TypefaceCache.Default;
+        }
+
+        private struct FontKey
         {
             public readonly string Name;
             public readonly SKFontStyleSlant Slant;
@@ -34,43 +66,11 @@ namespace Avalonia.Skia
                 return other is FontKey ? Equals((FontKey)other) : false;
             }
 
-            public bool Equals(FontKey other)
+            private bool Equals(FontKey other)
             {
                 return Name == other.Name && Slant == other.Slant &&
                        Weight == other.Weight;
             }
-
-            // Equals and GetHashCode ommitted
-        }
-
-        private readonly ConcurrentDictionary<FontKey, SKTypeface> _cachedTypefaces =
-            new ConcurrentDictionary<FontKey, SKTypeface>();
-
-        public void AddTypeFace(SKTypeface typeface)
-        {
-            var key = new FontKey(typeface.FamilyName, (SKFontStyleWeight)typeface.FontWeight, typeface.FontSlant);
-
-            _cachedTypefaces.TryAdd(key, typeface);
-        }
-
-        public SKTypeface GetTypeFace(Typeface typeface)
-        {
-            SKFontStyleSlant skStyle = SKFontStyleSlant.Upright;
-
-            switch (typeface.Style)
-            {
-                case FontStyle.Italic:
-                    skStyle = SKFontStyleSlant.Italic;
-                    break;
-
-                case FontStyle.Oblique:
-                    skStyle = SKFontStyleSlant.Oblique;
-                    break;
-            }
-
-            var key = new FontKey(typeface.FontFamily.Name, (SKFontStyleWeight)typeface.Weight, skStyle);
-
-            return _cachedTypefaces.TryGetValue(key, out var skTypeface) ? skTypeface : TypefaceCache.Default;
         }
     }
 }

src/Skia/Avalonia.Skia/SKTypefaceCollectionCache.cs

@@ -15,22 +15,32 @@ namespace Avalonia.Skia
             s_cachedCollections = new ConcurrentDictionary<FontFamilyKey, SKTypefaceCollection>();
         }
 
-        public static SKTypefaceCollection GetOrAddTypefaceCollection(FontFamily fontFamily)
+        /// <summary>
+        /// Gets the or add typeface collection.
+        /// </summary>
+        /// <param name="fontFamily">The font family.</param>
+        /// <returns></returns>
+        public static SKTypefaceCollection GetOrAddTypefaceCollection(IFontFamily fontFamily)
         {
             return s_cachedCollections.GetOrAdd(fontFamily.Key, x => CreateCustomFontCollection(fontFamily));
         }
 
-        private static SKTypefaceCollection CreateCustomFontCollection(FontFamily fontFamily)
+        /// <summary>
+        /// Creates the custom font collection.
+        /// </summary>
+        /// <param name="fontFamily">The font family.</param>
+        /// <returns></returns>
+        private static SKTypefaceCollection CreateCustomFontCollection(IFontFamily fontFamily)
         {
-            var assets = FontFamilyLoader.LoadFontAssets(fontFamily.Key);
+            var fontAssets = FontFamilyLoader.LoadFontAssets(fontFamily.Key);
 
             var typeFaceCollection = new SKTypefaceCollection();
 
             var assetLoader = AvaloniaLocator.Current.GetService<IAssetLoader>();
 
-            foreach (var fontAsset in assets)
+            foreach (var asset in fontAssets)
             {
-                var assetStream = assetLoader.Open(fontAsset.Source);
+                var assetStream = assetLoader.Open(asset);
 
                 var typeface = SKTypeface.FromStream(assetStream);
 

src/Windows/Avalonia.Direct2D1/Media/DWriteResourceFontFileStream.cs

@@ -40,7 +40,6 @@ namespace Avalonia.Direct2D1.Media
                 _stream.Position = fileOffset;
 
                 fragmentStart = _stream.PositionPointer;
-
             }
         }
 

src/Windows/Avalonia.Direct2D1/Media/DWriteResourceFontLoader.cs

@@ -6,6 +6,8 @@ using SharpDX.DirectWrite;
 
 namespace Avalonia.Direct2D1.Media
 {
+    using System;
+
     internal class DWriteResourceFontLoader : CallbackBase, FontCollectionLoader, FontFileLoader
     {
         private readonly List<DWriteResourceFontFileStream> _fontStreams = new List<DWriteResourceFontFileStream>();
@@ -17,15 +19,15 @@ namespace Avalonia.Direct2D1.Media
         /// </summary>
         /// <param name="factory">The factory.</param>
         /// <param name="fontAssets"></param>
-        public DWriteResourceFontLoader(Factory factory, IEnumerable<FontAsset> fontAssets)
+        public DWriteResourceFontLoader(Factory factory, IEnumerable<Uri> fontAssets)
         {
             var factory1 = factory;
 
             var assetLoader = AvaloniaLocator.Current.GetService<IAssetLoader>();
 
-            foreach (var font in fontAssets)
+            foreach (var asset in fontAssets)
             {
-                var assetStream = assetLoader.Open(font.Source);
+                var assetStream = assetLoader.Open(asset);
 
                 var dataStream = new DataStream((int)assetStream.Length, true, true);
 

src/Windows/Avalonia.Direct2D1/Media/Direct2D1FontCollectionCache.cs

@@ -13,31 +13,24 @@ namespace Avalonia.Direct2D1.Media
         static Direct2D1FontCollectionCache()
         {
             s_cachedCollections = new ConcurrentDictionary<FontFamilyKey, SharpDX.DirectWrite.FontCollection>();
+
             s_factory = AvaloniaLocator.Current.GetService<SharpDX.DirectWrite.Factory>();
+
             s_installedFontCollection = s_factory.GetSystemFontCollection(false);
         }
 
-        public static SharpDX.DirectWrite.FontCollection GetOrAddFontCollection(FontFamily fontFamily)
+        public static SharpDX.DirectWrite.FontCollection GetOrAddFontCollection(IFontFamily fontFamily)
         {
             return fontFamily.Key == null ? s_installedFontCollection : s_cachedCollections.GetOrAdd(fontFamily.Key, CreateFontCollection);
         }
 
-        private static SharpDX.DirectWrite.FontCollection CreateFontCollection(FontFamilyKey key)
-        {            
-            var assets = FontFamilyLoader.LoadFontAssets(key);
-
-            var fontLoader = new DWriteResourceFontLoader(s_factory, assets);
-
-            return new SharpDX.DirectWrite.FontCollection(s_factory, fontLoader, fontLoader.Key);
-        }
-
         public static SharpDX.DirectWrite.TextFormat GetTextFormat(Typeface typeface)
         {
             var fontFamily = typeface.FontFamily;
             var fontCollection = GetOrAddFontCollection(fontFamily);
             var fontFamilyName = FontFamily.Default.Name;
 
-            //Should this be cached?
+            // Should this be cached?
             foreach (var familyName in fontFamily.FamilyNames)
             {
                 if (!fontCollection.FindFamilyName(familyName, out _)) continue;
@@ -45,8 +38,23 @@ namespace Avalonia.Direct2D1.Media
                 break;
             }
 
-            return new SharpDX.DirectWrite.TextFormat(s_factory, fontFamilyName, fontCollection, (SharpDX.DirectWrite.FontWeight)typeface.Weight,
-                (SharpDX.DirectWrite.FontStyle)typeface.Style, SharpDX.DirectWrite.FontStretch.Normal, (float)typeface.FontSize);
+            return new SharpDX.DirectWrite.TextFormat(
+                s_factory, 
+                fontFamilyName, 
+                fontCollection, 
+                (SharpDX.DirectWrite.FontWeight)typeface.Weight,
+                (SharpDX.DirectWrite.FontStyle)typeface.Style, 
+                SharpDX.DirectWrite.FontStretch.Normal, 
+                (float)typeface.FontSize);
+        }
+
+        private static SharpDX.DirectWrite.FontCollection CreateFontCollection(FontFamilyKey key)
+        {
+            var assets = FontFamilyLoader.LoadFontAssets(key);
+
+            var fontLoader = new DWriteResourceFontLoader(s_factory, assets);
+
+            return new SharpDX.DirectWrite.FontCollection(s_factory, fontLoader, fontLoader.Key);
         }
     }
 }

src/Windows/Avalonia.Direct2D1/Media/FormattedTextImpl.cs

@@ -28,8 +28,12 @@ namespace Avalonia.Direct2D1.Media
             textFormat.WordWrapping =
                 wrapping == TextWrapping.Wrap ? DWrite.WordWrapping.Wrap : DWrite.WordWrapping.NoWrap;
 
-            TextLayout = new DWrite.TextLayout(factory, Text ?? string.Empty, textFormat, (float)constraint.Width,
-                (float)constraint.Height)
+            TextLayout = new DWrite.TextLayout(
+                             factory,
+                             Text ?? string.Empty,
+                             textFormat,
+                             (float)constraint.Width,
+                             (float)constraint.Height)
             {
                 TextAlignment = textAlignment.ToDirect2D()
             };

tests/Avalonia.UnitTests/MockAssetLoader.cs

@@ -27,12 +27,12 @@ namespace Avalonia.UnitTests
             return new MemoryStream(Encoding.UTF8.GetBytes(_assets[uri]));
         }
         
-        public (Stream Stream, Assembly Assembly) OpenAndGetAssembly(Uri uri, Uri baseUri = null)
+        public (Stream stream, Assembly assembly) OpenAndGetAssembly(Uri uri, Uri baseUri = null)
         {
             return (Open(uri, baseUri), (Assembly)null);
         }
 
-        public IEnumerable<(string AbsolutePath, Assembly Assembly)> GetAssets(Uri location)
+        public IEnumerable<(string absolutePath, Assembly assembly)> GetAssets(Uri location)
         {
             return _assets.Keys.Select(x => (x.AbsolutePath, Assembly.GetEntryAssembly()));
         }

tests/Avalonia.Visuals.UnitTests/Media/FontFamilyTests.cs

@@ -25,11 +25,19 @@ namespace Avalonia.Visuals.UnitTests.Media
         }
 
         [Fact]
-        public void ShouldImplicitlyConvertToString()
+        public void Should_Implicitly_Convert_String_To_FontFamily()
         {
-            var fontFamily = new FontFamily("Arial");        
+            FontFamily fontFamily = "Arial";
 
-            Assert.Equal("Arial", fontFamily);
+            Assert.Equal(new FontFamily("Arial"), fontFamily);
+        }
+
+        [Fact]
+        public void Should_Be_Equal()
+        {
+            var fontFamily = new FontFamily("Arial");
+
+            Assert.Equal(new FontFamily("Arial"), fontFamily);
         }
 
         [Fact]

tests/Avalonia.Visuals.UnitTests/Media/Fonts/FamilyNameCollectionTests.cs

@@ -21,5 +21,13 @@ namespace Avalonia.Visuals.UnitTests.Media.Fonts
         {
             Assert.Throws<ArgumentException>(() => new FamilyNameCollection(Enumerable.Empty<string>()));
         }
+
+        [Fact]
+        public void Should_Be_Equal()
+        {
+            var familyNames = new FamilyNameCollection(new[] { "Arial", "Times New Roman" });
+
+            Assert.Equal(new FamilyNameCollection(new[] { "Arial", "Times New Roman" }), familyNames);
+        }
     }
 }