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Implemented XEmbed client support with GtkSharp usage example (#17446)
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,66 @@ | ||
| using System.Runtime.InteropServices; | ||
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| namespace XEmbedSample; | ||
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| /* | ||
| This is needed specifically for GtkSharp: | ||
| https://github.com/mono/SkiaSharp/issues/3038 | ||
| https://github.com/GtkSharp/GtkSharp/issues/443 | ||
| Instead of using plain DllImport they are manually calling dlopen with RTLD_GLOBAL and RTLD_LAZY flags: | ||
| https://github.com/GtkSharp/GtkSharp/blob/b7303616129ab5a0ca64def45649ab522d83fa4a/Source/Libs/Shared/FuncLoader.cs#L80-L92 | ||
| Which causes libHarfBuzzSharp.so from HarfBuzzSharp to resolve some of the symbols from the system libharfbuzz.so.0 | ||
| which is a _different_ harfbuzz version. | ||
| That results in a segfault. | ||
| Previously there was a workaround - https://github.com/mono/SkiaSharp/pull/2247 but it got | ||
| disabled for .NET Core / .NET 5+. | ||
| Why linux linker builds shared libraries in a way that makes it possible for them to resolve their own symbols from | ||
| elsewhere escapes me. | ||
| Here we are loading libHarfBuzzSharp.so from the .NET-resolved location, saving it, unloading the library | ||
| and then defining a custom resolver that would call dlopen with RTLD_NOW + RTLD_DEEPBIND | ||
| */ | ||
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| public unsafe class HarfbuzzWorkaround | ||
| { | ||
| [DllImport("libc")] | ||
| static extern int dlinfo(IntPtr handle, int request, IntPtr info); | ||
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| [DllImport("libc")] | ||
| static extern IntPtr dlopen(string filename, int flags); | ||
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| private const int RTLD_DI_ORIGIN = 6; | ||
| private const int RTLD_NOW = 2; | ||
| private const int RTLD_DEEPBIND = 8; | ||
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| public static void Apply() | ||
| { | ||
| if (RuntimeInformation.RuntimeIdentifier.Contains("musl")) | ||
| throw new PlatformNotSupportedException("musl doesn't support RTLD_DEEPBIND"); | ||
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| var libraryPathBytes = Marshal.AllocHGlobal(4096); | ||
| var handle = NativeLibrary.Load("libHarfBuzzSharp", typeof(HarfBuzzSharp.Blob).Assembly, null); | ||
| dlinfo(handle, RTLD_DI_ORIGIN, libraryPathBytes); | ||
| var libraryOrigin = Marshal.PtrToStringUTF8(libraryPathBytes); | ||
| Marshal.FreeHGlobal(libraryPathBytes); | ||
| var libraryPath = Path.Combine(libraryOrigin, "libHarfBuzzSharp.so"); | ||
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| NativeLibrary.Free(handle); | ||
| var forceLoadedHandle = dlopen(libraryPath, RTLD_NOW | RTLD_DEEPBIND); | ||
| if (forceLoadedHandle == IntPtr.Zero) | ||
| throw new DllNotFoundException($"Unable to load {libraryPath} via dlopen"); | ||
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| NativeLibrary.SetDllImportResolver(typeof(HarfBuzzSharp.Blob).Assembly, (name, assembly, searchPath) => | ||
| { | ||
| if (name.Contains("HarfBuzzSharp")) | ||
| return dlopen(libraryPath, RTLD_NOW | RTLD_DEEPBIND); | ||
| return NativeLibrary.Load(name, assembly, searchPath); | ||
| }); | ||
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| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,63 @@ | ||
| using Avalonia; | ||
| using Avalonia.Controls; | ||
| using Avalonia.Controls.Primitives; | ||
| using Avalonia.Media; | ||
| using ControlCatalog; | ||
| using ControlCatalog.Models; | ||
| using Gtk; | ||
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| namespace XEmbedSample; | ||
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| class Program | ||
| { | ||
| static void Main(string[] args) | ||
| { | ||
| HarfbuzzWorkaround.Apply(); | ||
| AppBuilder.Configure<App>() | ||
| .UseSkia() | ||
| .With(new X11PlatformOptions() | ||
| { | ||
| UseGLibMainLoop = true, | ||
| ExterinalGLibMainLoopExceptionLogger = e => Console.WriteLine(e.ToString()) | ||
| }) | ||
| .UseX11() | ||
| .SetupWithoutStarting(); | ||
| App.SetCatalogThemes(CatalogTheme.Fluent); | ||
| Gdk.Global.AllowedBackends = "x11"; | ||
| Gtk.Application.Init("myapp", ref args); | ||
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| var w = new Gtk.Window("XEmbed Test Window"); | ||
| var socket = new AvaloniaXEmbedGtkSocket(w.StyleContext.GetBackgroundColor(StateFlags.Normal)) | ||
| { | ||
| Content = new ScrollViewer() | ||
| { | ||
| Content = new ControlCatalog.Pages.TextBoxPage(), | ||
| HorizontalScrollBarVisibility = ScrollBarVisibility.Auto | ||
| } | ||
| }; | ||
| var vbox = new Gtk.Box(Gtk.Orientation.Vertical, 5); | ||
| var label = new Gtk.Label("Those are GTK controls"); | ||
| vbox.Add(label); | ||
| vbox.Add(new Gtk.Entry()); | ||
| vbox.Add(new Gtk.Button(new Gtk.Label("Do nothing"))); | ||
| vbox.PackEnd(socket, true, true, 0); | ||
| socket.HeightRequest = 400; | ||
| socket.WidthRequest = 400; | ||
| w.Add(vbox); | ||
| socket.Realize(); | ||
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| w.AddSignalHandler("destroy", new EventHandler((_, __) => | ||
| { | ||
| Gtk.Application.Quit(); | ||
| socket.Destroy(); | ||
| })); | ||
| w.ShowAll(); | ||
| Gtk.Application.Run(); | ||
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| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,64 @@ | ||
| using Avalonia; | ||
| using Avalonia.X11; | ||
| using Gdk; | ||
| using Color = Cairo.Color; | ||
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| namespace XEmbedSample; | ||
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| public class AvaloniaXEmbedGtkSocket : Gtk.Socket | ||
| { | ||
| private readonly RGBA _backgroundColor; | ||
| private XEmbedPlug? _avaloniaPlug; | ||
| public AvaloniaXEmbedGtkSocket(RGBA backgroundColor) | ||
| { | ||
| _backgroundColor = backgroundColor; | ||
| } | ||
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| private object _content; | ||
| public object Content | ||
| { | ||
| get => _content; | ||
| set | ||
| { | ||
| _content = value; | ||
| if (_avaloniaPlug != null) | ||
| _avaloniaPlug.Content = _content; | ||
| } | ||
| } | ||
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| protected override void OnRealized() | ||
| { | ||
| base.OnRealized(); | ||
| _avaloniaPlug ??= XEmbedPlug.Create(); | ||
| _avaloniaPlug.ScaleFactor = ScaleFactor; | ||
| _avaloniaPlug.BackgroundColor = Avalonia.Media.Color.FromRgb((byte)(_backgroundColor.Red * 255), | ||
| (byte)(_backgroundColor.Green * 255), | ||
| (byte)(_backgroundColor.Blue * 255) | ||
| ); | ||
| _avaloniaPlug.Content = _content; | ||
| ApplyInteractiveResize(); | ||
| AddId((ulong)_avaloniaPlug.Handle); | ||
| } | ||
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| void ApplyInteractiveResize() | ||
| { | ||
| // This is _NOT_ a part of XEmbed, but allows us to have smooth resize | ||
| GetAllocatedSize(out var rect, out _); | ||
| var scale = ScaleFactor; | ||
| _avaloniaPlug?.ProcessInteractiveResize(new PixelSize(rect.Width * scale, rect.Height * scale)); | ||
| } | ||
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| protected override void OnSizeAllocated(Rectangle allocation) | ||
| { | ||
| base.OnSizeAllocated(allocation); | ||
| Display.Default.Sync(); | ||
| ApplyInteractiveResize(); | ||
| } | ||
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| protected override void OnDestroyed() | ||
| { | ||
| _avaloniaPlug?.Dispose(); | ||
| _avaloniaPlug = null; | ||
| base.OnDestroyed(); | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,20 @@ | ||
| <Project Sdk="Microsoft.NET.Sdk"> | ||
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| <PropertyGroup> | ||
| <OutputType>Exe</OutputType> | ||
| <TargetFramework>net6.0</TargetFramework> | ||
| <ImplicitUsings>enable</ImplicitUsings> | ||
| <Nullable>enable</Nullable> | ||
| <AllowUnsafeBlocks>true</AllowUnsafeBlocks> | ||
| </PropertyGroup> | ||
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| <ItemGroup> | ||
| <PackageReference Include="GtkSharp" Version="3.24.24.95" /> | ||
| </ItemGroup> | ||
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| <ItemGroup> | ||
| <ProjectReference Include="..\..\src\Avalonia.X11\Avalonia.X11.csproj" /> | ||
| <ProjectReference Include="..\ControlCatalog\ControlCatalog.csproj" /> | ||
| </ItemGroup> | ||
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| </Project> |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,8 @@ | ||
| using Avalonia.Threading; | ||
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| namespace Avalonia.X11.Dispatching; | ||
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| interface IX11PlatformDispatcher : IDispatcherImpl | ||
| { | ||
| X11EventDispatcher EventDispatcher { get; } | ||
| } |
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