Merge 522625bfb5 into 658afb8717

samples/RenderDemo/MainWindow.xaml

@@ -43,6 +43,8 @@
         </MenuItem>
         <MenuItem Header="Tests">
           <MenuItem Command="{Binding ResizeWindow}" Header="Resize window" />
+          <MenuItem x:Name="SetNotTransparencyMenuItem" Header="Set window not Transparency" Click="SetNotTransparencyMenuItem_OnClick"/>
+          <MenuItem x:Name="SetTransparencyMenuItem" Header="Set window Transparency" Click="SetTransparencyMenuItem_OnClick"/>
         </MenuItem>
       </MenuFlyout>
     </FlyoutBase.AttachedFlyout>

samples/RenderDemo/MainWindow.xaml.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Linq.Expressions;
 using Avalonia.Controls;
+using Avalonia.Interactivity;
 using Avalonia.Markup.Xaml;
 using Avalonia.Rendering;
 using RenderDemo.ViewModels;
@@ -37,5 +38,15 @@ namespace RenderDemo
         {
             AvaloniaXamlLoader.Load(this);
         }
+
+        private void SetNotTransparencyMenuItem_OnClick(object? sender, RoutedEventArgs e)
+        {
+            TransparencyLevelHint = [WindowTransparencyLevel.None];
+        }
+
+        private void SetTransparencyMenuItem_OnClick(object? sender, RoutedEventArgs e)
+        {
+            TransparencyLevelHint = [WindowTransparencyLevel.Transparent];
+        }
     }
 }

src/Avalonia.Controls/TopLevel.cs

@@ -217,9 +217,9 @@ namespace Avalonia.Controls
 
             _scaling = ValidateScaling(impl.RenderScaling);
             _actualTransparencyLevel = PlatformImpl.TransparencyLevel;
+            
 
-
-
+            
 
             _accessKeyHandler = TryGetService<IAccessKeyHandler>(dependencyResolver);
             _inputManager = TryGetService<IInputManager>(dependencyResolver);

src/Windows/Avalonia.Win32/DComposition/DirectCompositedWindow.cs

@@ -1,6 +1,6 @@
 using System;
-using System.Numerics;
 using System.Threading;
+using Avalonia.Controls;
 using Avalonia.OpenGL.Egl;
 using Avalonia.Reactive;
 using MicroCom.Runtime;
@@ -51,4 +51,13 @@ internal class DirectCompositedWindow : IDisposable
             Monitor.Exit(_shared.SyncRoot);
         });
     }
+
+    public bool IsTransparency => _transparencyLevel != WindowTransparencyLevel.None;
+
+    public void SetTransparencyLevel(WindowTransparencyLevel transparencyLevel)
+    {
+        _transparencyLevel = transparencyLevel;
+    }
+
+    private WindowTransparencyLevel _transparencyLevel;
 }

src/Windows/Avalonia.Win32/DComposition/DirectCompositedWindowSurface.cs

@@ -1,9 +1,15 @@
 using System;
 using System.ComponentModel;
+using System.Diagnostics.CodeAnalysis;
+
+using Avalonia.Controls;
+using Avalonia.Controls.Shapes;
 using Avalonia.OpenGL.Egl;
 using Avalonia.Platform;
 using Avalonia.Win32.DirectX;
 using Avalonia.Win32.Interop;
+using Avalonia.Win32.WinRT;
+
 using MicroCom.Runtime;
 
 namespace Avalonia.Win32.DComposition;
@@ -25,6 +31,7 @@ internal class DirectCompositedWindowSurface : IDirect3D11TexturePlatformSurface
     {
         _window ??= new DirectCompositedWindow(_info, _shared);
         SetBlur(_blurEffect);
+        _window.SetTransparencyLevel(_windowTransparencyLevel);
 
         return new DirectCompositedWindowRenderTarget(context, d3dDevice, _shared, _window);
     }
@@ -43,6 +50,14 @@ internal class DirectCompositedWindowSurface : IDirect3D11TexturePlatformSurface
         _blurEffect = enable;
         // _window?.SetBlur(enable);
     }
+
+    public void SetTransparencyLevel(WindowTransparencyLevel transparencyLevel)
+    {
+        _windowTransparencyLevel = transparencyLevel;
+        _window?.SetTransparencyLevel(transparencyLevel);
+    }
+
+    private WindowTransparencyLevel _windowTransparencyLevel;
 }
 
 internal class DirectCompositedWindowRenderTarget : IDirect3D11TextureRenderTarget
@@ -50,11 +65,13 @@ internal class DirectCompositedWindowRenderTarget : IDirect3D11TextureRenderTarg
     private static readonly Guid IID_ID3D11Texture2D = Guid.Parse("6f15aaf2-d208-4e89-9ab4-489535d34f9c");
 
     private readonly IPlatformGraphicsContext _context;
+    private readonly DirectCompositionShared _shared;
     private readonly DirectCompositedWindow _window;
-    private readonly IDCompositionVirtualSurface _surface;
+    private IDCompositionVirtualSurface _surface;
     private bool _lost;
     private PixelSize _size;
     private readonly IUnknown _d3dDevice;
+    private bool _isSurfaceSupportTransparency;
 
     public DirectCompositedWindowRenderTarget(
         IPlatformGraphicsContext context, IntPtr d3dDevice,
@@ -63,13 +80,25 @@ internal class DirectCompositedWindowRenderTarget : IDirect3D11TextureRenderTarg
         _d3dDevice = MicroComRuntime.CreateProxyFor<IUnknown>(d3dDevice, false).CloneReference();
 
         _context = context;
+        _shared = shared;
         _window = window;
 
-        using (var surfaceFactory = shared.Device.CreateSurfaceFactory(_d3dDevice))
-        {
-            _surface = surfaceFactory.CreateVirtualSurface(1, 1, DXGI_FORMAT.DXGI_FORMAT_B8G8R8A8_UNORM,
-                DXGI_ALPHA_MODE.DXGI_ALPHA_MODE_PREMULTIPLIED);
-        }
+        CreateSurface(window);
+    }
+
+    [MemberNotNull(nameof(_surface))]
+    private void CreateSurface(DirectCompositedWindow window)
+    {
+        using var surfaceFactory = _shared.Device.CreateSurfaceFactory(_d3dDevice);
+
+        const uint initialSize = 1;
+        var alphaMode = window.IsTransparency ?
+            DXGI_ALPHA_MODE.DXGI_ALPHA_MODE_PREMULTIPLIED :
+            DXGI_ALPHA_MODE.DXGI_ALPHA_MODE_IGNORE;
+        _isSurfaceSupportTransparency = window.IsTransparency;
+
+        _surface = surfaceFactory.CreateVirtualSurface(initialSize, initialSize, DXGI_FORMAT.DXGI_FORMAT_B8G8R8A8_UNORM,
+            alphaMode);
     }
 
     public void Dispose()
@@ -88,9 +117,19 @@ internal class DirectCompositedWindowRenderTarget : IDirect3D11TextureRenderTarg
         bool needsEndDraw = false;
         try
         {
+            bool forceResize = false;
+            if (_window.IsTransparency != _isSurfaceSupportTransparency)
+            {
+                _surface.Dispose();
+
+                CreateSurface(_window);
+
+                forceResize = true;
+            }
+
             var size = _window.WindowInfo.Size;
             var scale = _window.WindowInfo.Scaling;
-            if (_size != size)
+            if (forceResize || _size != size)
             {
                 _surface.Resize((ushort)size.Width, (ushort)size.Height);
                 _size = size;

src/Windows/Avalonia.Win32/IBlurHost.cs

@@ -1,4 +1,6 @@
-namespace Avalonia.Win32;
+using Avalonia.Controls;
+
+namespace Avalonia.Win32;
 
 internal enum BlurEffect
 {
@@ -14,4 +16,5 @@ internal interface ICompositionEffectsSurface
     bool IsBlurSupported(BlurEffect effect);
 
     void SetBlur(BlurEffect enable);
+    void SetTransparencyLevel(WindowTransparencyLevel transparencyLevel);
 }

src/Windows/Avalonia.Win32/WinRT/Composition/WinUiCompositedWindow.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Numerics;
 using System.Threading;
+using Avalonia.Controls;
 using Avalonia.OpenGL.Egl;
 using Avalonia.Reactive;
 using MicroCom.Runtime;
@@ -112,4 +113,13 @@ internal class WinUiCompositedWindow : IDisposable
             }
         }
     }
+
+    public bool IsTransparency => _transparencyLevel != WindowTransparencyLevel.None;
+
+    public void SetTransparencyLevel(WindowTransparencyLevel transparencyLevel)
+    {
+        _transparencyLevel = transparencyLevel;
+    }
+
+    private WindowTransparencyLevel _transparencyLevel;
 }

src/Windows/Avalonia.Win32/WinRT/Composition/WinUiCompositedWindowSurface.cs

@@ -1,4 +1,6 @@
 using System;
+using System.Diagnostics.CodeAnalysis;
+using Avalonia.Controls;
 using Avalonia.OpenGL.Egl;
 using Avalonia.Platform;
 using Avalonia.Win32.DirectX;
@@ -26,6 +28,7 @@ namespace Avalonia.Win32.WinRT.Composition
                 ?.WinUICompositionBackdropCornerRadius;
             _window ??= new WinUiCompositedWindow(_info, _shared, cornerRadius);
             _window.SetBlur(_blurEffect);
+            _window.SetTransparencyLevel(_windowTransparencyLevel);
 
             return new WinUiCompositedWindowRenderTarget(context, _window, d3dDevice, _shared.Compositor);
         }
@@ -50,6 +53,14 @@ namespace Avalonia.Win32.WinRT.Composition
             _blurEffect = enable;
             _window?.SetBlur(enable);
         }
+
+        public void SetTransparencyLevel(WindowTransparencyLevel transparencyLevel)
+        {
+            _windowTransparencyLevel = transparencyLevel;
+            _window?.SetTransparencyLevel(transparencyLevel);
+        }
+
+        private WindowTransparencyLevel _windowTransparencyLevel;
     }
 
     internal class WinUiCompositedWindowRenderTarget : IDirect3D11TextureRenderTarget
@@ -63,11 +74,11 @@ namespace Avalonia.Win32.WinRT.Composition
         private readonly ICompositorInterop _interop;
         private readonly ICompositionGraphicsDevice _compositionDevice;
         private readonly ICompositionGraphicsDevice2 _compositionDevice2;
-        private readonly ICompositionSurface _surface;
+        private ICompositionSurface _surface;
         private PixelSize _size;
         private bool _lost;
-        private readonly ICompositionDrawingSurfaceInterop _surfaceInterop;
-        private readonly ICompositionDrawingSurface _drawingSurface;
+        private ICompositionDrawingSurfaceInterop _surfaceInterop;
+        private ICompositionDrawingSurface _drawingSurface;
 
         public WinUiCompositedWindowRenderTarget(IPlatformGraphicsContext context,
             WinUiCompositedWindow window, IntPtr device,
@@ -83,10 +94,8 @@ namespace Avalonia.Win32.WinRT.Composition
                 _interop = compositor.QueryInterface<ICompositorInterop>();
                 _compositionDevice = _interop.CreateGraphicsDevice(_d3dDevice);
                 _compositionDevice2 = _compositionDevice.QueryInterface<ICompositionGraphicsDevice2>();
-                _drawingSurface = _compositionDevice2.CreateDrawingSurface2(new UnmanagedMethods.SIZE(),
-                    DirectXPixelFormat.B8G8R8A8UIntNormalized, DirectXAlphaMode.Premultiplied);
-                _surface = _drawingSurface.QueryInterface<ICompositionSurface>();
-                _surfaceInterop = _drawingSurface.QueryInterface<ICompositionDrawingSurfaceInterop>();
+
+                CreateSurface(window);
             }
             catch
             {
@@ -102,6 +111,17 @@ namespace Avalonia.Win32.WinRT.Composition
             }
         }
 
+        [MemberNotNull(nameof(_drawingSurface), nameof(_surface), nameof(_surfaceInterop))]
+        private void CreateSurface(WinUiCompositedWindow window)
+        {
+            // Do not use Premultiplied when the window is not Transparency. Because the Premultiplied AlphaMode will increase the performance loss of DWM. See https://github.com/AvaloniaUI/Avalonia/issues/20643
+            var alphaMode = window.IsTransparency ? DirectXAlphaMode.Premultiplied : DirectXAlphaMode.Ignore;
+            _drawingSurface = _compositionDevice2.CreateDrawingSurface2(new UnmanagedMethods.SIZE(),
+                DirectXPixelFormat.B8G8R8A8UIntNormalized, alphaMode);
+            _surface = _drawingSurface.QueryInterface<ICompositionSurface>();
+            _surfaceInterop = _drawingSurface.QueryInterface<ICompositionDrawingSurfaceInterop>();
+        }
+
         public void Dispose()
         {
             _surface.Dispose();
@@ -121,9 +141,25 @@ namespace Avalonia.Win32.WinRT.Composition
             if (IsCorrupted)
                 throw new RenderTargetCorruptedException();
             var transaction = _window.BeginTransaction();
+
             bool needsEndDraw = false;
             try
             {
+                bool forceResize = false;
+                var supportTransparency = _drawingSurface.AlphaMode == DirectXAlphaMode.Premultiplied;
+                if (_window.IsTransparency != supportTransparency)
+                {
+                    // Re-create the surface with correct alpha mode if the transparency support is not correct. This can happen when the transparency level is changed.
+                    _surface.Dispose();
+                    _surfaceInterop.Dispose();
+                    _drawingSurface.Dispose();
+
+                    CreateSurface(_window);
+
+                    // The _drawingSurface.Size != _size, so that require force resize to update the size of surface.
+                    forceResize = true;
+                }
+
                 var size = _window.WindowInfo.Size;
                 var scale = _window.WindowInfo.Scaling;
                 _window.ResizeIfNeeded(size);
@@ -133,7 +169,7 @@ namespace Avalonia.Win32.WinRT.Composition
                 UnmanagedMethods.POINT off;
                 try
                 {
-                    if (_size != size)
+                    if (forceResize || _size != size)
                     {
                         _surfaceInterop.Resize(new UnmanagedMethods.POINT
                         {

src/Windows/Avalonia.Win32/WindowImpl.cs

@@ -3,8 +3,10 @@ using System.Collections.Generic;
 using System.ComponentModel;
 using System.Diagnostics.CodeAnalysis;
 using System.Linq;
+using System.Reflection.Emit;
 using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
+
 using Avalonia.Collections.Pooled;
 using Avalonia.Controls;
 using Avalonia.Controls.Platform;
@@ -12,22 +14,24 @@ using Avalonia.Input;
 using Avalonia.Input.Platform;
 using Avalonia.Input.Raw;
 using Avalonia.Input.TextInput;
+using Avalonia.Logging;
 using Avalonia.OpenGL.Egl;
 using Avalonia.Platform;
 using Avalonia.Platform.Surfaces;
 using Avalonia.Platform.Storage;
+using Avalonia.Platform.Storage.FileIO;
 using Avalonia.Rendering.Composition;
+using Avalonia.Threading;
 using Avalonia.Win32.DirectX;
 using Avalonia.Win32.Input;
 using Avalonia.Win32.Interop;
 using Avalonia.Win32.OpenGl;
 using Avalonia.Win32.OpenGl.Angle;
 using Avalonia.Win32.WinRT.Composition;
-using static Avalonia.Win32.Interop.UnmanagedMethods;
-using Avalonia.Platform.Storage.FileIO;
-using Avalonia.Threading;
+
 using static Avalonia.Controls.Win32Properties;
-using Avalonia.Logging;
+using static Avalonia.Rendering.Composition.Animations.PropertySetSnapshot;
+using static Avalonia.Win32.Interop.UnmanagedMethods;
 
 namespace Avalonia.Win32
 {
@@ -180,6 +184,7 @@ namespace Avalonia.Win32
             _nativeControlHost = new Win32NativeControlHost(this, !UseRedirectionBitmap);
             _defaultTransparencyLevel = UseRedirectionBitmap ? WindowTransparencyLevel.None : WindowTransparencyLevel.Transparent;
             _transparencyLevel = _defaultTransparencyLevel;
+            SetTransparencyLevel(_transparencyLevel);
 
             lock (s_instances)
                 s_instances.Add(this);
@@ -321,6 +326,7 @@ namespace Avalonia.Win32
                 if (_transparencyLevel != value)
                 {
                     _transparencyLevel = value;
+                    SetTransparencyLevel(value);
                     TransparencyLevelChanged?.Invoke(value);
                 }
             }
@@ -372,6 +378,13 @@ namespace Avalonia.Win32
 
         public void SetTransparencyLevelHint(IReadOnlyList<WindowTransparencyLevel> transparencyLevels)
         {
+            if (transparencyLevels.Count == 1 && transparencyLevels[0] == WindowTransparencyLevel.None)
+            {
+                // Explicitly disable transparency. Ignore the UseRedirectionBitmap property.
+                TransparencyLevel = WindowTransparencyLevel.None;
+                return;
+            }
+
             foreach (var level in transparencyLevels)
             {
                 if (!IsSupported(level))
@@ -506,6 +519,11 @@ namespace Avalonia.Win32
             return result == 0;
         }
 
+        private void SetTransparencyLevel(WindowTransparencyLevel transparencyLevel)
+        {
+            CompositionEffectsSurface?.SetTransparencyLevel(transparencyLevel);
+        }
+
         public IPlatformRenderSurface[] Surfaces
             => _glSurface is null ?
                 [(IPlatformRenderSurface)Handle, _framebuffer] :