SkiaSharp.Views.Forms.WPF nuget Package does not work out of the Box

[inforithmics]

Description

https://www.nuget.org/packages/SkiaSharp.Views.Forms.WPF/1.68.1-rc.169 does not work out of the box. The Xamarin WPF Application crashes with an SKCanvasViewRenderer does not implement IRegistrable

Code
<PackageReference Include="SkiaSharp.Views.Forms.WPF" Version="1.68.1-rc.169" />

Expected Behavior

Xamarin WPF Application works without issues.

Actual Behavior

Xamarin WPF Application with Skiasharp crashes.

Basic Information

• Version with issue: 1.68.1-rc.169
• Last known good version: Not applicable
• IDE: Visual Studio 2019 16.3.9
• Platform Target Frameworks: 4.7.1
  • Windows Classic: Windows 10 1909
• Target Devices: Desktop WPF Application

Screenshots
None

Reproduction Link
None

Workaround
Adding this Package Reference fixed it for me.

<PackageReference Include="SkiaSharp.Views.Forms">
      <Version>1.68.1-rc.169</Version>
      <ExcludeAssets>all</ExcludeAssets>
    </PackageReference>

Because during compilation it took the dll from SkiaSharp.Views.Forms
instead of SkiaSharp.Views.Forms.WPF.
I think the error is that SkiaSharp.Views.Forms.WPF has a dependency on SkiaSharp.Views.Forms. (which it shouldn't have because both
SkiaSharp.Views.Forms.WPF
and
SkiaSharp.Views.Forms provide SkiaSharp.Views.Forms.dll).
And nuget decides in my case to use the SkiaSharp.Views.Forms nuget package dll which does not work on WPF.

[mattleibow]

Ah, I think you may actually be wanting to use SkiaSharp.Views.WPF. Note the lack of the .Forms in the name. This just includes the WPF bits and should work with both .NET Framework and .NET Core.

Unless you are using Xamarin.Forms and then I have a dodgy package.

[mattleibow]

I see what you mean. I created a new project and I see what you are talking about. Let me find a fix

[inforithmics]

Yes you are right, I meant a Xamarin.Forms WPF Application.

[mattleibow]

Thanks for reporting this issue. I got it fixed and it will be in the next preview release.

[mattleibow]

I am pushing a NuGet now. rc.170 should be up soon and you can test.

[inforithmics]

I tested it and the SkiaSharp.Views.Forms.Wpf works like a charm, thanks a lot. I tested if the UWP and the Android Version work too and they seemed fine.
In the Android Version I found a strange behavior. On a real arm64 device it works, but in the emulator (x64 on a pc) the colors seem to be wrong in skiasharp.

For me it seems that in the x64 android compilation something went wrong.
For example Blue became somewhat green. and when I changed the transperency to white the colors changed to violett.

I reverted back to 1.68 and the colors looked perfect in the emulator.

[mattleibow]

@inforithmics Could you open a new issue on this? I want to make sure that I fix any issues before we release. I don't think I changed anything for Android, but I can check. Also could you attach some screenshots/sample code that generates this?

[inforithmics]

I created a new issue: #1017

[mattleibow]

Thanks! I will investigate.