missing method: "SKPathOps::AsWinding"

[deakjahn]

There is a newer method AsWinding() in:

https://github.com/google/skia/blob/master/include/pathops/SkPathOps.h

It's supposed to help with the even-odd vs. winding problems in Boolean path operations. It would really be needed from SkiaSharp as well...

[Gillibald]

This is not part of the m68 release so it will only be available if a newer release is targeted.

[deakjahn]

Well, considering that the whole Path Ops subsytem is nearly unusable because of that (of course, it also depends on which filling rule you actually need), what are our hopes?

[deakjahn]

To put it into some perspective: it seems that no matter what kind of paths you send into the operations, it always comes out in even-odd. This is the function that they added to fix it if you need it in non-zero (winding). Without the function, you simply can't work in non-zero mode at all because you can input but you can't use the output at all. And a rather large part of the world (SVG, fonts, PostScript, PDF and so on) uses the non-zero mode; I'd venture to say most.

[mattleibow]

Thanks for brining this out, I am hoping to update to the latest skia soon, so we will get this method. I can't say exactly when, but I hope before the end of this year.

[Gillibald]

SkiaSharp has only one maintainer so it is expected to take longer. How many people are working on Skia itself? This is open source so feel free to contribute something.

[Gillibald]

It is totally fine to start with all the Windows dependencies and add other platforms later. The build chain to compile everything is part of the repo so you only have to supply all dependencies that are needed to build for your target platform. On Windows this is mainly msbuild (VisualStudio).

The moment you create a pull request you can use DevOps to build for all platforms.

I am contributing to SkiaSharp myself and haven't had any issues building everything I need. This is all done in my free time.

The community can help bringing this project further.

It is not trivial to update Skia to a newer version because the code base changes a lot. There is no guarantee for backward compatibility.

Skia itself has no C API that we need for P/Invoke so we have to wrap everything with custom code. So it is not just pulling latest master and press build.

[mattleibow]

At least m80 has this feature and it can be added.