Create SKSurfaces with a GRContext if one is provided.

src/Skia/Avalonia.Skia/DrawingContextImpl.cs

@@ -26,6 +26,7 @@ namespace Avalonia.Skia
         private readonly Stack<double> _opacityStack = new Stack<double>();
         private readonly Matrix? _postTransform;
         private readonly IVisualBrushRenderer _visualBrushRenderer;
+        private readonly GRContext _grContext;
         private double _currentOpacity = 1.0f;
         private readonly bool _canTextUseLcdRendering;
         private Matrix _currentTransform;
@@ -54,6 +55,11 @@ namespace Avalonia.Skia
             /// Render text without Lcd rendering.
             /// </summary>
             public bool DisableTextLcdRendering;
+
+            /// <summary>
+            /// Optional GPU context.
+            /// </summary>
+            public GRContext GrContext;
         }
 
         /// <summary>
@@ -65,6 +71,7 @@ namespace Avalonia.Skia
         {
             _dpi = createInfo.Dpi;
             _visualBrushRenderer = createInfo.VisualBrushRenderer;
+            _grContext = createInfo.GrContext;
             _disposables = disposables;
             _canTextUseLcdRendering = !createInfo.DisableTextLcdRendering;
 
@@ -615,7 +622,8 @@ namespace Avalonia.Skia
                 Height = height,
                 Dpi = dpi,
                 Format = format,
-                DisableTextLcdRendering = !_canTextUseLcdRendering
+                DisableTextLcdRendering = !_canTextUseLcdRendering,
+                GrContext = _grContext
             };
 
             return new SurfaceRenderTarget(createInfo);

src/Skia/Avalonia.Skia/GlRenderTarget.cs

@@ -66,7 +66,8 @@ namespace Avalonia.Skia
                 Canvas = _canvas,
                 Dpi = new Vector(dpiX * SkiaPlatform.DefaultDpi.X, dpiY * SkiaPlatform.DefaultDpi.Y),
                 VisualBrushRenderer = visualBrushRenderer,
-                DisableTextLcdRendering = true
+                DisableTextLcdRendering = true,
+                GrContext = _grContext
             };
 
             return new DrawingContextImpl(createInfo, Disposable.Create(() =>

src/Skia/Avalonia.Skia/SurfaceRenderTarget.cs

@@ -19,7 +19,8 @@ namespace Avalonia.Skia
         private readonly SKSurface _surface;
         private readonly SKCanvas _canvas;
         private readonly bool _disableLcdRendering;
-        
+        private readonly GRContext _grContext;
+
         /// <summary>
         /// Create new surface render target.
         /// </summary>
@@ -30,8 +31,8 @@ namespace Avalonia.Skia
             PixelHeight = createInfo.Height;
             _dpi = createInfo.Dpi;
             _disableLcdRendering = createInfo.DisableTextLcdRendering;
-
-            _surface = CreateSurface(PixelWidth, PixelHeight, createInfo.Format);
+            _grContext = createInfo.GrContext;
+            _surface = CreateSurface(PixelWidth, PixelHeight, createInfo.GrContext, createInfo.Format);
 
             _canvas = _surface?.Canvas;
 
@@ -48,11 +49,10 @@ namespace Avalonia.Skia
         /// <param name="height">Height.</param>
         /// <param name="format">Format.</param>
         /// <returns></returns>
-        private static SKSurface CreateSurface(int width, int height, PixelFormat? format)
+        private static SKSurface CreateSurface(int width, int height, GRContext grContext, PixelFormat? format)
         {
             var imageInfo = MakeImageInfo(width, height, format);
-
-            return SKSurface.Create(imageInfo);
+            return grContext != null ? SKSurface.Create(grContext, false, imageInfo) : SKSurface.Create(imageInfo);
         }
 
         /// <inheritdoc />
@@ -73,7 +73,7 @@ namespace Avalonia.Skia
                 Canvas = _canvas,
                 Dpi = _dpi,
                 VisualBrushRenderer = visualBrushRenderer,
-                DisableTextLcdRendering = _disableLcdRendering
+                DisableTextLcdRendering = true
             };
 
             return new DrawingContextImpl(createInfo);
@@ -164,6 +164,11 @@ namespace Avalonia.Skia
             /// Render text without Lcd rendering.
             /// </summary>
             public bool DisableTextLcdRendering;
+
+            /// <summary>
+            /// Optional GPU context.
+            /// </summary>
+            public GRContext GrContext;
         }
     }
 }