Change the native library names to libSkiaSharp

[mattleibow]

I have just been working with @galvesribeiro to get SkiaSharp onto a ARM v6l Linux device (yay!) #18. One of the issues was that we had to re-build SkiaSharp just so that we could change the native library name in the [DllImport].

What are the opinions of changing the native library name to a uniform libSkiaSharp so that future Linux (or any other "normal" builds) can just use the Desktop assembly?

We might even remove the need for the .dll.config file currently. (just a guess)

[galvesribeiro]

And that is working as you can see! :)

[mattleibow]

Work being done in #81

[kekekeks]

Why not use dlsym/GetProcAddress and Marshal.GetDelegateFromFunctionPtr instead of DllImport? That will add a lot of flexibility in native library location like looking for correct CPU arch version in libSkiaSharp-x86.dll or libSkiaSharp-x64.dll depending on current platform.

Something like that (MIT-licensed):
https://github.com/kekekeks/evhttp-sharp/blob/master/EvHttpSharp/Interop/LinuxLoader.cs
https://github.com/kekekeks/evhttp-sharp/blob/master/EvHttpSharp/Interop/OsxLoader.cs
https://github.com/kekekeks/evhttp-sharp/blob/master/EvHttpSharp/Interop/Win32Loader.cs

https://github.com/kekekeks/evhttp-sharp/blob/master/EvHttpSharp/Interop/Event.cs (usage)

[kekekeks]

The only issue that I see is iOS static linker, but I think that a custom dlsym (skiasharp_dlsym or something) could be implemented in the native code. We did it this way in our old skia-based backend in avalonia(aka perspex) and it worked quite well.

[jameswalmsley]

Are there any instruction on how this was achieved. I want to run SkiaSharp on native Linux but intel.

[mattleibow]

@jameswalmsley I just use a default name of libSkiaSharp.[a/dll/so/dylib]

I do this in the https://github.com/mono/SkiaSharp/blob/v1.53.0/binding/Binding/SkiaApi.cs#L48-L62
You should be able to just #if __LINUX__ or something. But, it should also fall back to the default "libSkiaSharp" and the mono runtime will automatically select the correct extension on the platform.