Implemented IDisposable for IRenderer

src/Gtk/Perspex.Cairo/Media/DrawingContext.cs

@@ -24,19 +24,13 @@ namespace Perspex.Cairo.Media
         /// The cairo context.
         /// </summary>
         private Cairo.Context context;
-
-        /// <summary>
-        /// The cairo surface.
-        /// </summary>
-        private Cairo.Surface surface;
-
+        
         /// <summary>
         /// Initializes a new instance of the <see cref="DrawingContext"/> class.
         /// </summary>
         /// <param name="surface">The target surface.</param>
         public DrawingContext(Cairo.Surface surface)
         {
-            this.surface = surface;
             this.context = new Cairo.Context(surface);
             this.CurrentTransform = Matrix.Identity;
         }
@@ -47,7 +41,6 @@ namespace Perspex.Cairo.Media
         /// <param name="surface">The GDK drawable.</param>
         public DrawingContext(Gdk.Drawable drawable)
         {
-            this.Drawable = drawable;
             this.context = Gdk.CairoHelper.Create(drawable);
             this.CurrentTransform = Matrix.Identity;
         }
@@ -58,24 +51,12 @@ namespace Perspex.Cairo.Media
             private set;
         }
 
-        public Gdk.Drawable Drawable
-        {
-            get;
-            private set;
-        }
-
         /// <summary>
         /// Ends a draw operation.
         /// </summary>
         public void Dispose()
         {
             this.context.Dispose();
-
-         //   if (this.surface is Cairo.Win32Surface)
-       //     {
-            if (this.surface != null)
-                this.surface.Dispose();
-           // }
         }
 
         public void DrawImage(IBitmap bitmap, double opacity, Rect sourceRect, Rect destRect)

src/Gtk/Perspex.Cairo/Renderer.cs

@@ -20,7 +20,8 @@ namespace Perspex.Cairo
     /// </summary>
     public class Renderer : RendererBase
     {
-        private ImageSurface surface;
+        private Surface surface;
+        private Gdk.Window window;
 
         /// <summary>
         /// Initializes a new instance of the <see cref="Renderer"/> class.
@@ -46,6 +47,7 @@ namespace Perspex.Cairo
         {
             // Don't need to do anything here.
         }
+        
 
         /// <summary>
         /// Creates a cairo surface that targets a platform-specific resource.
@@ -54,16 +56,16 @@ namespace Perspex.Cairo
         /// <returns>A surface wrapped in an <see cref="IDrawingContext"/>.</returns>
         protected override IDrawingContext CreateDrawingContext(IPlatformHandle handle)
         {
+            
             switch (handle.HandleDescriptor)
             {
-                case "HWND":
-                    return new DrawingContext(new Win32Surface(GetDC(handle.Handle)));
                 case "RTB":
                     return new DrawingContext(this.surface);
-                case "HDC":
-                    return new DrawingContext(new Win32Surface(handle.Handle));
                 case "GdkWindow":
-                    return new DrawingContext(new Gdk.Window(handle.Handle));
+                    if (this.window == null)
+                        this.window = new Gdk.Window(handle.Handle);
+
+                    return new DrawingContext(this.window);
                 default:
                     throw new NotSupportedException(string.Format(
                         "Don't know how to create a Cairo renderer from a '{0}' handle",
@@ -73,5 +75,9 @@ namespace Perspex.Cairo
 
         [DllImport("user32.dll")]
         private static extern IntPtr GetDC(IntPtr hwnd);
+
+        public override void Dispose()
+        {
+        }
     }
 }

src/Perspex.SceneGraph/Platform/IRenderer.cs

@@ -6,6 +6,8 @@
 
 namespace Perspex.Platform
 {
+    using System;
+
     /// <summary>
     /// Defines a renderer.
     /// </summary>
@@ -15,7 +17,7 @@ namespace Perspex.Platform
     /// as RenderBase has a default implementation for the non-platform specific parts of a
     /// renderer.
     /// </remarks>
-    public interface IRenderer
+    public interface IRenderer : IDisposable
     {
         /// <summary>
         /// Gets the number of times <see cref="Render"/> has been called.

src/Perspex.SceneGraph/Rendering/RendererBase.cs

@@ -6,6 +6,7 @@
 
 namespace Perspex.Rendering
 {
+    using System;
     using System.Linq;
     using Perspex.Media;
     using Perspex.Platform;
@@ -27,6 +28,8 @@ namespace Perspex.Rendering
             private set;
         }
 
+        public abstract void Dispose();
+
         /// <summary>
         /// Renders the specified visual.
         /// </summary>

src/Windows/Perspex.Direct2D1/Renderer.cs

@@ -108,5 +108,10 @@ namespace Perspex.Direct2D1
         {
             return new DrawingContext(this.renderTarget, this.DirectWriteFactory);
         }
+
+        public override void Dispose()
+        {
+            this.renderTarget.Dispose();
+        }
     }
 }