Fix various Direct2D resource leak issues, as well as an unclosed geometry stream.

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

@@ -21,6 +21,7 @@ namespace Avalonia.Direct2D1.Media
         private readonly ILayerFactory _layerFactory;
         private readonly SharpDX.Direct2D1.RenderTarget _renderTarget;
         private readonly DeviceContext _deviceContext;
+        private readonly bool _ownsDeviceContext;
         private readonly SharpDX.DXGI.SwapChain1 _swapChain;
         private readonly Action _finishedCallback;
 
@@ -51,10 +52,12 @@ namespace Avalonia.Direct2D1.Media
             if (_renderTarget is DeviceContext deviceContext)
             {
                 _deviceContext = deviceContext;
+                _ownsDeviceContext = false;
             }
             else
             {
                 _deviceContext = _renderTarget.QueryInterface<DeviceContext>();
+                _ownsDeviceContext = true;
             }
 
             _deviceContext.BeginDraw();
@@ -96,6 +99,13 @@ namespace Avalonia.Direct2D1.Media
             {
                 throw new RenderTargetCorruptedException(ex);
             }
+            finally
+            {
+                if (_ownsDeviceContext)
+                {
+                    _deviceContext.Dispose();
+                }
+            }
         }
 
         /// <summary>
@@ -151,7 +161,7 @@ namespace Avalonia.Direct2D1.Media
             using (var d2dSource = ((BitmapImpl)source.Item).GetDirect2DBitmap(_deviceContext))
             using (var sourceBrush = new BitmapBrush(_deviceContext, d2dSource.Value))
             using (var d2dOpacityMask = CreateBrush(opacityMask, opacityMaskRect.Size))
-            using (var geometry = new SharpDX.Direct2D1.RectangleGeometry(_deviceContext.Factory, destRect.ToDirect2D()))
+            using (var geometry = new SharpDX.Direct2D1.RectangleGeometry(Direct2D1Platform.Direct2D1Factory, destRect.ToDirect2D()))
             {
                 if (d2dOpacityMask.PlatformBrush != null)
                 {

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

@@ -33,13 +33,13 @@ namespace Avalonia.Direct2D1.Media
         /// <inheritdoc/>
         public IGeometryImpl Intersect(IGeometryImpl geometry)
         {
-            var result = new PathGeometry(Geometry.Factory);
+            var result = new PathGeometry(Direct2D1Platform.Direct2D1Factory);
-
             using (var sink = result.Open())
             {
                 Geometry.Combine(((GeometryImpl)geometry).Geometry, CombineMode.Intersect, sink);
-                return new StreamGeometryImpl(result);
+                sink.Close();
             }
+            return new StreamGeometryImpl(result);
         }
 
         /// <inheritdoc/>

src/Windows/Avalonia.Direct2D1/Media/Imaging/WicBitmapImpl.cs

@@ -13,7 +13,7 @@ namespace Avalonia.Direct2D1.Media
     /// </summary>
     public class WicBitmapImpl : BitmapImpl
     {
-        private BitmapDecoder _decoder;
+        private readonly BitmapDecoder _decoder;
 
         private static BitmapInterpolationMode ConvertInterpolationMode(Avalonia.Visuals.Media.Imaging.BitmapInterpolationMode interpolationMode)
         {
@@ -41,7 +41,7 @@ namespace Avalonia.Direct2D1.Media
         /// <param name="fileName">The filename of the bitmap to load.</param>
         public WicBitmapImpl(string fileName)
         {
-            using (BitmapDecoder decoder = new BitmapDecoder(Direct2D1Platform.ImagingFactory, fileName, DecodeOptions.CacheOnDemand))
+            using (var decoder = new BitmapDecoder(Direct2D1Platform.ImagingFactory, fileName, DecodeOptions.CacheOnDemand))
             {
                 WicImpl = new Bitmap(Direct2D1Platform.ImagingFactory, decoder.GetFrame(0), BitmapCreateCacheOption.CacheOnDemand);
                 Dpi = new Vector(96, 96);
@@ -177,7 +177,7 @@ namespace Avalonia.Direct2D1.Media
         /// <returns>The Direct2D bitmap.</returns>
         public override OptionalDispose<D2DBitmap> GetDirect2DBitmap(SharpDX.Direct2D1.RenderTarget renderTarget)
         {
-            FormatConverter converter = new FormatConverter(Direct2D1Platform.ImagingFactory);
+            using var converter = new FormatConverter(Direct2D1Platform.ImagingFactory);
             converter.Initialize(WicImpl, SharpDX.WIC.PixelFormat.Format32bppPBGRA);
             return new OptionalDispose<D2DBitmap>(D2DBitmap.FromWicBitmap(renderTarget, converter), true);
         }

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

@@ -29,9 +29,12 @@ namespace Avalonia.Direct2D1.Media
         public IStreamGeometryImpl Clone()
         {
             var result = new PathGeometry(Direct2D1Platform.Direct2D1Factory);
-            var sink = result.Open();
+            using (var sink = result.Open())
-            ((PathGeometry)Geometry).Stream(sink);
+            {
-            sink.Close();
+                ((PathGeometry)Geometry).Stream(sink);
+                sink.Close();
+            }
+
             return new StreamGeometryImpl(result);
         }
 

src/Windows/Avalonia.Direct2D1/PrimitiveExtensions.cs

@@ -111,7 +111,7 @@ namespace Avalonia.Direct2D1
         /// <returns>The Direct2D brush.</returns>
         public static StrokeStyle ToDirect2DStrokeStyle(this Avalonia.Media.IPen pen, SharpDX.Direct2D1.RenderTarget renderTarget)
         {
-            return pen.ToDirect2DStrokeStyle(renderTarget.Factory);
+            return pen.ToDirect2DStrokeStyle(Direct2D1Platform.Direct2D1Factory);
         }
 
         /// <summary>