Path ops failure/bug

[Mike Clifton]

I'm using Skia's path ops and it mostly works great, but sometimes I'm getting failures when trying to combine what appear to be valid paths.

I've been able to create a reproducible case as a Skia fiddle:

https://fiddle.skia.org/c/35660d2b39bb43dcaa16ed324850e2a0

Basically, I create two paths, an oval and a star. I then try to subtract the star from the circle. I get back a result path, but it's not what it should be. The picture here shows the outlines of the oval and star, and the red area is (what is supposed to be) circle - star.

If I tweak some of the coordinates slightly, I can get it to work. But am I doing something wrong, or is this a bug in path ops? Should I go ahead and file a bug?

[Mike Clifton]

In this picture I've tweaked the coordinates of the star path. The result is a distorted star, but the path op gives the right result - the red area shows the star path subtracted from the oval shape. I'd like to get basically this result without distorting the star.

[Jim Van Verth]

That sounds like a bug, I'd go ahead and file it.

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Jim Van Verth | Software Engineer | Google.com

[Mike Clifton]

Ok, thanks. I've filed a bug here:

https://issues.skia.org/issues/377820800