Cleanup Skia internal APIs

src/Skia/Avalonia.Skia/GlyphRunImpl.cs

@@ -1,15 +1,12 @@
 using System;
 using System.Collections.Generic;
-using Avalonia.Metadata;
 using Avalonia.Platform;
 using SkiaSharp;
 #nullable enable
 
 namespace Avalonia.Skia
 {
-    /// <inheritdoc />
-    [Unstable]
-    public class GlyphRunImpl : IGlyphRunImpl
+    internal class GlyphRunImpl : IGlyphRunImpl
     {
         public GlyphRunImpl(SKTextBlob textBlob, Size size, Point baselineOrigin)
         {

src/Skia/Avalonia.Skia/GlyphTypefaceImpl.cs

@@ -1,14 +1,12 @@
 using System;
 using System.Runtime.InteropServices;
 using Avalonia.Media;
-using Avalonia.Metadata;
 using HarfBuzzSharp;
 using SkiaSharp;
 
 namespace Avalonia.Skia
 {
-    [Unstable]
-    public class GlyphTypefaceImpl : IGlyphTypeface
+    internal class GlyphTypefaceImpl : IGlyphTypeface
     {
         private bool _isDisposed;
 

src/Skia/Avalonia.Skia/SKTypefaceCollection.cs

@@ -4,7 +4,7 @@ using SkiaSharp;
 
 namespace Avalonia.Skia
 {
-    public class SKTypefaceCollection
+    internal class SKTypefaceCollection
     {
         private readonly ConcurrentDictionary<Typeface, SKTypeface> _typefaces =
             new ConcurrentDictionary<Typeface, SKTypeface>();

src/Skia/Avalonia.Skia/SKTypefaceCollectionCache.cs

@@ -7,7 +7,7 @@ using SkiaSharp;
 
 namespace Avalonia.Skia
 {
-    public static class SKTypefaceCollectionCache
+    internal static class SKTypefaceCollectionCache
     {
         private static readonly ConcurrentDictionary<FontFamily, SKTypefaceCollection> s_cachedCollections;
 

src/Skia/Avalonia.Skia/readme.md

@@ -1,22 +0,0 @@
-DrawingContextImpl
-- Alpha support missing as SkiaSharp does not expose this
-- Gradient Shader caching?
-- Pen Dash styles
-
-Formatted Text Rendering 
-- Minor polish
-
-Linux
-- Need gpu platform implementation
-
-macOS
-- Need gpu platform implementation
-
-Android
-- Not tested at all yet
-
-iOS
-- Not tested at all yet
-
-General
-- Get Skia Unit Tests passing (most of the issues are related to antialiasing)