Avalonia / Skia expect pixels in physical units rather than logical ones. Hard code DPI values for now.

src/Avalonia.Windowing/Bindings/GlWindow.cs

@@ -25,9 +25,15 @@ namespace Avalonia.Windowing.Bindings
         [DllImport("winit_wrapper")]
         private static extern LogicalSize winit_gl_window_get_size(IntPtr handle);
 
+        [DllImport("winit_wrapper")]
+        private static extern LogicalPosition winit_gl_window_get_position(IntPtr handle);
+
         [DllImport("winit_wrapper")]
         private static extern void winit_gl_window_present(IntPtr handle);
 
+        [DllImport("winit_wrapper")]
+        private static extern void winit_gl_window_show(IntPtr handle);
+
         [DllImport("winit_wrapper")]
         private static extern IntPtr winit_gl_window_get_proc_addr(IntPtr handle, string symbol);
 
@@ -64,15 +70,23 @@ namespace Avalonia.Windowing.Bindings
 
         public (double, double) GetSize() {
             var size = winit_gl_window_get_size(_handle);
-
             return (size.Width, size.Height);
         }
 
         public (double, double) GetFramebufferSize()
         {
-            var size = winit_gl_window_get_size(_handle);
+            return GetSize();
+        }
 
-            return (size.Width, size.Height);
+        public (double, double) GetPosition()
+        {
+            var position = winit_gl_window_get_position(_handle);
+            return (position.X, position.Y);
+        }
+
+        public void Show()
+        {
+            winit_gl_window_show(_handle);
         }
     }
 }

src/Avalonia.Windowing/Bindings/IWindowWrapper.cs

@@ -9,5 +9,7 @@ namespace Avalonia.Windowing.Bindings
         void SetTitle(string title);
         void SetSize(double width, double height);
         (double, double) GetSize();
+        (double, double) GetPosition();
+        void Show();
     }
 }

src/Avalonia.Windowing/Bindings/Window.cs

@@ -36,5 +36,15 @@ namespace Avalonia.Windowing.Bindings
         {
             return (0, 0);
         }
+
+        public (double, double) GetPosition()
+        {
+            return (0, 0);
+        }
+
+        public void Show()
+        {
+            
+        }
     }
 }

src/Avalonia.Windowing/WIndowingPlatform.cs

@@ -82,6 +82,7 @@ namespace Avalonia.Windowing
 
         public void Signal(DispatcherPriority priority)
         {
+            // We need to run some sort of callback on wakeup don't we?
             _eventsLoop.Wakeup();
         }
 

src/Avalonia.Windowing/WindowImpl.cs

@@ -21,7 +21,19 @@ namespace Avalonia.Windowing
         public WindowState WindowState { get; set; }
         public Action<WindowState> WindowStateChanged { get; set; }
         public Func<bool> Closing { get; set; }
-        public Point Position { get; set; }
+        public Point Position 
+        {
+            get 
+            {
+                var (x, y) = _windowWrapper.GetPosition();
+                return new Point(x, y);
+            } 
+            set 
+            {
+                var x = value; 
+            }
+        }
+
         public Action<Point> PositionChanged { get; set; }
         public Action Deactivated { get; set; }
         public Action Activated { get; set; }
@@ -36,11 +48,11 @@ namespace Avalonia.Windowing
             get 
             {
                 var (width, height) = _windowWrapper.GetSize();
-                return new Size(width, height);
+                return new Size(width * 2, height * 2);
             }
         }
 
-        public double Scaling => 1.0;
+        public double Scaling => 192 / 96;
 
         public IEnumerable<object> Surfaces => new List<object>() { _windowWrapper };
 
@@ -89,18 +101,24 @@ namespace Avalonia.Windowing
 
         public Point PointToClient(Point point)
         {
-            return point;
+            point = point.WithY(ClientSize.Height - point.Y);
+            var (x, y) = _windowWrapper.GetPosition();
+            return new Point(point.X + x, point.Y + y);
         }
 
         public Point PointToScreen(Point point)
         {
-            return point;
+            point = point.WithY(ClientSize.Height - point.Y);
+            var (x, y) = _windowWrapper.GetPosition();
+            return new Point(point.X - x, point.Y - y);;
         }
 
         public void Resize(Size clientSize)
         {
             // This is where we size the window accordingly..
-            _windowWrapper.SetSize(clientSize.Width, clientSize.Height);
+            _windowWrapper.SetSize(clientSize.Width / Scaling, clientSize.Height / Scaling);
+
+            // TODO: Move this to when we receive the Resized message.
             Resized(clientSize);
         }
 
@@ -135,6 +153,7 @@ namespace Avalonia.Windowing
 
         public void Show()
         {
+            _windowWrapper.Show();
         }
 
         public IDisposable ShowDialog()

src/Skia/Avalonia.Skia/GlRenderTarget.cs

@@ -31,14 +31,14 @@ namespace Avalonia.Skia
         {
             // TODO: These are hard coded for now. Don't do that.
             // TODO: Recreate the surface when the size changes.
-            // if (_surface == null)
-            //  {
+             if (_surface == null)
+             {
                 var (width, height) = _context.GetFramebufferSize();
 
                 _surface = SKSurface.Create(_grContext, new GRBackendRenderTargetDesc
                 {
-                    Height = (int)height,
-                    Width = (int)width,
+                    Height = (int)height * 2,
+                    Width = (int)width * 2,
                     SampleCount = 1,
                     StencilBits = 8,
                     Config = GRPixelConfig.Bgra8888,
@@ -47,12 +47,15 @@ namespace Avalonia.Skia
                 });
 
                 _canvas = _surface.Canvas;
-        //    }
+            }
+
+            _canvas.RestoreToCount(-1);
+            _canvas.ResetMatrix();
 
             var createInfo = new DrawingContextImpl.CreateInfo
             {
                 Canvas = _canvas,
-                Dpi = new Vector(96, 96),
+                Dpi = new Vector(192, 192),
                 VisualBrushRenderer = visualBrushRenderer,
                 DisableTextLcdRendering = true
             };