Enabling threads on wasm preview causes skiasharp fail to load

[Rytisgit]

Current behavior

Launching project results in the uno logo splash screen to stay up and console to print error about libSkiaSharp failing to load:

fail: Uno.UI.Dispatching.CoreDispatcher[0]
      Dispatcher unhandled exception
System.InvalidOperationException: Failed to load VS2022SkiaError.MainPage: System.TypeInitializationException: TypeInitialization_Type, SkiaSharp.SKImageInfo
 ---> System.DllNotFoundException: libSkiaSharp
   at SkiaSharp.SKImageInfo..cctor() in D:\a\1\s\binding\Binding\SKImageInfo.cs:line 46
   Exception_EndOfInnerExceptionStack
   at VS2022SkiaError.MainPage..ctor() in C:\source\VS2022SkiaError\VS2022SkiaError\VS2022SkiaError.Wasm\Uno.UI.SourceGenerators\Uno.UI.SourceGenerators.XamlGenerator.XamlCodeGenerator\MainPage_2dd2af64094792981fb43b8c6148227d.cs:line 26
   at VS2022SkiaError.Wasm.MetadataBuilder_573.CreateInstance() in C:\source\VS2022SkiaError\VS2022SkiaError\VS2022SkiaError.Wasm\Uno.UI.SourceGenerators\Uno.UI.SourceGenerators.BindableTypeProviders.BindableTypeProvidersSourceGenerator\BindableMetadata.cs:line 20964
   at Microsoft.UI.Xaml.Controls.Frame.CreatePageInstance(Type sourcePageType) in C:\a\1\s\src\Uno.UI\UI\Xaml\Controls\Frame\Frame.cs:line 445
   at Microsoft.UI.Xaml.PagePool.DequeuePage(Type pageType) in C:\a\1\s\src\Uno.UI\UI\Xaml\PagePool.cs:line 69
   at Microsoft.UI.Xaml.Controls.Frame.CreatePageInstanceCached(Type sourcePageType) in C:\a\1\s\src\Uno.UI\UI\Xaml\Controls\Frame\Frame.cs:line 435
   at Microsoft.UI.Xaml.Controls.Frame.InnerNavigate(PageStackEntry entry, NavigationMode mode) in C:\a\1\s\src\Uno.UI\UI\Xaml\Controls\Frame\Frame.cs:line 283
   at VS2022SkiaError.App.OnNavigationFailed(Object sender, NavigationFailedEventArgs e) in C:\source\VS2022SkiaError\VS2022SkiaError\VS2022SkiaError.Shared\App.xaml.cs:line 97
   at Microsoft.UI.Xaml.Controls.Frame.InnerNavigate(PageStackEntry entry, NavigationMode mode) in C:\a\1\s\src\Uno.UI\UI\Xaml\Controls\Frame\Frame.cs:line 300
   at Microsoft.UI.Xaml.Controls.Frame.Navigate(Type sourcePageType, Object parameter, NavigationTransitionInfo infoOverride) in C:\a\1\s\src\Uno.UI\UI\Xaml\Controls\Frame\Frame.cs:line 276
   at Microsoft.UI.Xaml.Controls.Frame.Navigate(Type sourcePageType, Object parameter) in C:\a\1\s\src\Uno.UI\UI\Xaml\Controls\Frame\Frame.cs:line 271
   at VS2022SkiaError.App.OnLaunched(LaunchActivatedEventArgs args) in C:\source\VS2022SkiaError\VS2022SkiaError\VS2022SkiaError.Shared\App.xaml.cs:line 83
   at Microsoft.UI.Xaml.Application.Initialize() in C:\a\1\s\src\Uno.UI\UI\Xaml\Application.wasm.cs:line 130
   at Uno.UI.Dispatching.CoreDispatcher.InvokeOperationSafe(UIAsyncOperation operation) in C:\a\1\s\src\Uno.UI.Dispatching\Core\CoreDispatcher.cs:line 337

Expected behavior

Libraries load correctly when threading is enabled.

How to reproduce it (as minimally and precisely as possible)

update to preview uno wasm, enable threading, try creating a bitmap in MainPage.xaml.cs VS2022SkiaError.zip

Workaround

Don't enable threading

Works on UWP/WinUI

No response

Environment

No response

NuGet package version(s)

<PackageReference Include="Microsoft.Extensions.Logging" Version="5.0.0" />
<PackageReference Include="SkiaSharp.Views.Uno.WinUI" Version="2.88.1-preview.58" />
<PackageReference Include="Uno.Extensions.Logging.WebAssembly.Console" Version="1.3.0" />
<PackageReference Include="Uno.WinUI.WebAssembly" Version="4.5.0-dev.95" />
<PackageReference Include="Uno.WinUI.RemoteControl" Version="4.5.0-dev.95" Condition="'$(Configuration)'=='Debug'" />
<PackageReference Include="Uno.UI.Adapter.Microsoft.Extensions.Logging" Version="4.5.0-dev.306" />
<PackageReference Include="Uno.Wasm.Bootstrap" Version="4.0.0-dev.174" />
<PackageReference Include="Uno.Wasm.Bootstrap.DevServer" Version="4.0.0-dev.174" />

Affected platforms

WebAssembly

IDE

Visual Studio 2022

IDE version

17.3.0 Preview 3.0

Relevant plugins

No response

Anything else we need to know?

This is just speculation, but it could be due to a single library failing to load, causing all libraries to fail at once. I experienced the same issue including a self compiled .bc static library, which was done on an older emscripten(so I assume it failed to load due to that). After upgrading emscripten to latest version and recompiling the project worked correctly, not showing the libSkiaSharp error and allowing me to call both skiasharp and the self compiled library.

[jeromelaban]

Thanks for the report. Indeed, SkiaSharp needs to be built using threading enabled (or with a specific set of options to make it compatible). The Wasm Boostrapper needs to understand how to select threading and non-threading versions of the binaries, something that is not yet available.

[jeromelaban]

Will be fixed by https://github.com/mono/SkiaSharp/pull/2259