Implement invalid rect coalescing to work around the lack of an OS driven invalidation mechanism in winit

src/Avalonia.Windowing/Bindings/EventNotifier.cs

@@ -1,13 +1,16 @@
 using System;
 using System.Runtime.InteropServices;
+using System.Security;
 
 namespace Avalonia.Windowing.Bindings
 {
     public delegate void MouseEventCallback(IntPtr windowId, MouseEvent mouseEvent);
     public delegate void ResizeEventCallback(IntPtr windowId, ResizeEvent resizeEvent);
     public delegate void KeyboardEventCallback(IntPtr windowId, KeyboardEvent keyboardEvent);
-    public delegate void AwakenedEventCallback();
 
+    [UnmanagedFunctionPointer(CallingConvention.Cdecl)] 
+    public delegate void AwakenedEventCallback();
+     
     [StructLayout(LayoutKind.Sequential)]
     public struct EventNotifier
     {

src/Avalonia.Windowing/Bindings/Events.cs

@@ -27,12 +27,12 @@ namespace Avalonia.Windowing.Bindings
     [StructLayout(LayoutKind.Sequential)]
     public struct KeyboardEvent
     {
-        public bool Pressed { get; set; }
-        public bool Shift { get; set; }
-        public bool Control { get; set; }
-        public bool Alt { get; set; }
-        public bool Logo { get; set; }
-        UInt32 VirtualKeyCode { get; set; }
+        public byte Pressed { get; set; }
+        public byte Shift { get; set; }
+        public byte Control { get; set; }
+        public byte Alt { get; set; }
+        public byte Logo { get; set; }
+        public VirtualKeyCode VirtualKeyCode { get; set; }
     }
 
     [StructLayout(LayoutKind.Sequential)]

src/Avalonia.Windowing/Bindings/EventsLoop.cs

@@ -33,7 +33,9 @@ namespace Avalonia.Windowing.Bindings
 
         public event KeyboardEventCallback OnKeyboardEvent;
         public event MouseEventCallback OnMouseEvent;
+
         public event AwakenedEventCallback OnAwakened;
+
         public event ResizeEventCallback OnResized;
 
         public EventsLoop()

src/Avalonia.Windowing/KeyTransform.cs

@@ -0,0 +1,211 @@
+using System;
+using System.Collections.Generic;
+using Avalonia.Input;
+
+namespace Avalonia.Windowing
+{
+    public enum VirtualKeyCode : UInt32
+    {
+        /// The '1' key over the letters.
+        Key1,
+        /// The '2' key over the letters.
+        Key2,
+        /// The '3' key over the letters.
+        Key3,
+        /// The '4' key over the letters.
+        Key4,
+        /// The '5' key over the letters.
+        Key5,
+        /// The '6' key over the letters.
+        Key6,
+        /// The '7' key over the letters.
+        Key7,
+        /// The '8' key over the letters.
+        Key8,
+        /// The '9' key over the letters.
+        Key9,
+        /// The '0' key over the 'O' and 'P' keys.
+        Key0,
+
+        A,
+        B,
+        C,
+        D,
+        E,
+        F,
+        G,
+        H,
+        I,
+        J,
+        K,
+        L,
+        M,
+        N,
+        O,
+        P,
+        Q,
+        R,
+        S,
+        T,
+        U,
+        V,
+        W,
+        X,
+        Y,
+        Z,
+
+        /// The Escape key, next to F1.
+        Escape,
+
+        F1,
+        F2,
+        F3,
+        F4,
+        F5,
+        F6,
+        F7,
+        F8,
+        F9,
+        F10,
+        F11,
+        F12,
+        F13,
+        F14,
+        F15,
+
+        /// Print Screen/SysRq.
+        Snapshot,
+        /// Scroll Lock.
+        Scroll,
+        /// Pause/Break key, next to Scroll lock.
+        Pause,
+
+        /// `Insert`, next to Backspace.
+        Insert,
+        Home,
+        Delete,
+        End,
+        PageDown,
+        PageUp,
+
+        Left,
+        Up,
+        Right,
+        Down,
+
+        /// The Backspace key, right over Enter.
+        // TODO: rename
+        Back,
+        /// The Enter key.
+        Return,
+        /// The space bar.
+        Space,
+
+        /// The "Compose" key on Linux.
+        Compose,
+
+        Caret,
+
+        Numlock,
+        Numpad0,
+        Numpad1,
+        Numpad2,
+        Numpad3,
+        Numpad4,
+        Numpad5,
+        Numpad6,
+        Numpad7,
+        Numpad8,
+        Numpad9,
+
+        AbntC1,
+        AbntC2,
+        Add,
+        Apostrophe,
+        Apps,
+        At,
+        Ax,
+        Backslash,
+        Calculator,
+        Capital,
+        Colon,
+        Comma,
+        Convert,
+        Decimal,
+        Divide,
+        Equals,
+        Grave,
+        Kana,
+        Kanji,
+        LAlt,
+        LBracket,
+        LControl,
+        LShift,
+        LWin,
+        Mail,
+        MediaSelect,
+        MediaStop,
+        Minus,
+        Multiply,
+        Mute,
+        MyComputer,
+        NavigateForward, // also called "Prior"
+        NavigateBackward, // also called "Next"
+        NextTrack,
+        NoConvert,
+        NumpadComma,
+        NumpadEnter,
+        NumpadEquals,
+        OEM102,
+        Period,
+        PlayPause,
+        Power,
+        PrevTrack,
+        RAlt,
+        RBracket,
+        RControl,
+        RShift,
+        RWin,
+        Semicolon,
+        Slash,
+        Sleep,
+        Stop,
+        Subtract,
+        Sysrq,
+        Tab,
+        Underline,
+        Unlabeled,
+        VolumeDown,
+        VolumeUp,
+        Wake,
+        WebBack,
+        WebFavorites,
+        WebForward,
+        WebHome,
+        WebRefresh,
+        WebSearch,
+        WebStop,
+        Yen,
+        Copy,
+        Paste,
+        Cut,
+    }
+
+    public static class KeyTransform
+    {
+        static readonly Dictionary<VirtualKeyCode, Key> Keys = new Dictionary<VirtualKeyCode, Key>
+        {
+            [VirtualKeyCode.Key0] = Key.D0,
+            [VirtualKeyCode.Key1] = Key.D1,
+
+            [VirtualKeyCode.A] = Key.A
+        };
+
+        public static Key? TransformKeyCode(VirtualKeyCode code)
+        {
+            if (Keys.TryGetValue(code, out var rv))
+                return rv;
+            return null;
+        }
+    }
+}

src/Avalonia.Windowing/WIndowingPlatform.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Diagnostics;
 using System.Reactive.Disposables;
 using System.Runtime.InteropServices;
 using System.Threading;
@@ -69,11 +70,17 @@ namespace Avalonia.Windowing
             }
         }
 
+        private bool _signaled;
         private void _eventsLoop_Awakened()
         {
-            Signaled?.Invoke(DispatcherPriority.Input);
-            Signaled?.Invoke(DispatcherPriority.Layout);
-            Signaled?.Invoke(DispatcherPriority.Render);
+            lock (this)
+            {
+                if (!_signaled)
+                    return;
+                _signaled = false;
+            }
+
+            Signaled?.Invoke(null);
         }
 
 
@@ -83,11 +90,15 @@ namespace Avalonia.Windowing
             Instance.DoInitialize();
         }
 
+        private readonly IKeyboardDevice keyboardDevice = new KeyboardDevice();
+        private readonly IMouseDevice mouseDevice = new MouseDevice();
+
         public void DoInitialize() 
         {
             AvaloniaLocator.CurrentMutable
                 .Bind<IWindowingPlatform>().ToConstant(this)
-                .Bind<IMouseDevice>().ToConstant(new MouseDevice())
+                .Bind<IKeyboardDevice>().ToConstant(keyboardDevice)
+                .Bind<IMouseDevice>().ToConstant(mouseDevice)
                 .Bind<IPlatformIconLoader>().ToConstant(new IconLoader())
                 .Bind<IStandardCursorFactory>().ToConstant(new CursorFactory())
                 .Bind<IPlatformSettings>().ToConstant(new PlatformSettings())
@@ -127,7 +138,13 @@ namespace Avalonia.Windowing
 
         public void Signal(DispatcherPriority priority)
         {
-            // We need to run some sort of callback on wakeup don't we?
+            lock (this)
+            {
+                if (_signaled)
+                    return;
+                _signaled = true;
+            }
+
             _eventsLoop.Wakeup();
         }
 
@@ -135,10 +152,12 @@ namespace Avalonia.Windowing
 
         public IDisposable StartTimer(DispatcherPriority priority, TimeSpan interval, Action tick)
         {
-            var x = new TimerDel(tick);
-            timerTickers.Add(x);
+            // TODO: Need a way to cancel a timer when Dispose is called. 
+
+           // var x = new TimerDel(tick);
+           // timerTickers.Add(x);
 
-            _eventsLoop.RunTimer(x);
+         //   _eventsLoop.RunTimer(x);
             return Disposable.Create(() => {
          //       timerTickers.Remove(x);
             });

src/Avalonia.Windowing/WindowImpl.cs

@@ -1,5 +1,9 @@
 using System;
 using System.Collections.Generic;
+using System.Linq;
+using System.Reactive;
+using System.Reactive.Linq;
+using System.Reactive.Subjects;
 using Avalonia.Controls;
 using Avalonia.Gpu;
 using Avalonia.Input;
@@ -19,6 +23,17 @@ namespace Avalonia.Windowing
         public WindowImpl(IWindowWrapper wrapper)
         {
             _windowWrapper = wrapper;
+
+            // TODO: This is only necessary when using ImmediateRenderer
+            Observable.Repeat(Observable.Timer(TimeSpan.FromMilliseconds(16)))
+                      .SubscribeOn(AvaloniaScheduler.Instance)
+                      .Subscribe((x) =>
+                      {
+                            if (coalescedRect != Rect.Empty) {
+                              Dispatcher.UIThread.Post(() => Paint(coalescedRect), DispatcherPriority.Render);
+                              coalescedRect = Rect.Empty;
+                            }
+                      });
         }
 
         public WindowState WindowState { get; set; }
@@ -37,6 +52,12 @@ namespace Avalonia.Windowing
             }
         }
 
+        public bool timeToPaint = false;
+
+        public void Test() {
+            timeToPaint = true;
+        }
+
         public Action<Point> PositionChanged { get; set; }
         public Action Deactivated { get; set; }
         public Action Activated { get; set; }
@@ -66,7 +87,8 @@ namespace Avalonia.Windowing
         public Action<double> ScalingChanged { get; set; }
         public Action Closed { get; set; }
 
-        public IMouseDevice MouseDevice => new MouseDevice();
+        public IMouseDevice MouseDevice => AvaloniaLocator.Current.GetService<IMouseDevice>();
+        public IKeyboardDevice KeyboardDevice => AvaloniaLocator.Current.GetService<IKeyboardDevice>();
 
         public void Activate()
         {
@@ -99,9 +121,10 @@ namespace Avalonia.Windowing
             _windowWrapper.Hide();
         }
 
+        private Rect coalescedRect = Rect.Empty;
         public void Invalidate(Rect rect)
         {
-            Paint?.Invoke(rect);
+            coalescedRect = coalescedRect.Union(rect);
         }
 
         public Point PointToClient(Point point)
@@ -121,9 +144,7 @@ namespace Avalonia.Windowing
             if (clientSize == ClientSize)
                 return;
 
-            // This is where we size the window accordingly..
             _windowWrapper.SetSize(clientSize.Width, clientSize.Height);
-            //Resized(clientSize);
         }
 
         public void SetCursor(IPlatformHandle cursor)
@@ -171,13 +192,13 @@ namespace Avalonia.Windowing
 
         public void OnKeyboardEvent (KeyboardEvent evt)
         {
-
+           Dispatcher.UIThread.RunJobs(DispatcherPriority.Input + 1);
+           Input(new RawKeyEventArgs(KeyboardDevice, (uint)Environment.TickCount, evt.Pressed == 1 ? RawKeyEventType.KeyDown : RawKeyEventType.KeyUp, KeyTransform.TransformKeyCode(evt.VirtualKeyCode).Value, InputModifiers.None));
         }
 
         public void OnMouseEvent(MouseEvent evt)
         {
-            Dispatcher.UIThread.RunJobs(DispatcherPriority.Input);
-
+            Dispatcher.UIThread.RunJobs(DispatcherPriority.Input + 1);
             switch(evt.EventType)
             {
                 case MouseEventType.Move:
@@ -185,7 +206,7 @@ namespace Avalonia.Windowing
                     break;
 
                 case MouseEventType.Wheel:
-                    Input(new RawMouseWheelEventArgs(MouseDevice, (uint)Environment.TickCount, _inputRoot, new Point(_lastPosition.X, _lastPosition.Y), new Point(evt.Position.X / 50, evt.Position.Y / 50), InputModifiers.None));
+                    Input(new RawMouseWheelEventArgs(MouseDevice, (uint)Environment.TickCount, _inputRoot, new Point(_lastPosition.X, _lastPosition.Y), new Point(evt.Position.X / 50, evt.Position.Y), InputModifiers.None));
                     return;
             }
 

src/Skia/Avalonia.Skia/GlRenderTarget.cs

@@ -41,19 +41,17 @@ namespace Avalonia.Skia
                     Width = (int)width * 2,
                     SampleCount = 1,
                     StencilBits = 8,
-                    Config = GRPixelConfig.Rgba8888,
+                    Config = GRPixelConfig.Bgra8888,
                     Origin = GRSurfaceOrigin.BottomLeft,
                     RenderTargetHandle = IntPtr.Zero
                 };
 
+                _canvas?.Dispose();
                 _surface?.Dispose();
                 _surface = SKSurface.Create(_grContext, _desc);
-                _canvas?.Dispose();
                 _canvas = _surface.Canvas;
             }
 
-            _canvas.Clear(SKColors.Orange);
-
             var createInfo = new DrawingContextImpl.CreateInfo
             {
                 Canvas = _canvas,
@@ -64,7 +62,7 @@ namespace Avalonia.Skia
 
             return new DrawingContextImpl(createInfo, Disposable.Create(() =>
             {
-                _canvas.Flush();
+               // _canvas.Flush();
                 _grContext.Flush();
                 _context.Present(); // Swap Buffers
             }));