🚀 go-pugleaf

Dunno how Apple represents regions.  If you want to look at another,
public implementation of code which does that sort of thing, look at
the MIT X11R4 server.  It is pretty well tuned at this point...
Has to be; it is fundamental to the X server and used all over the
place (and X now does very complex shapes due to the shape extension;
it had to be fast to make that work well).

Of course, I don't guarantee the code is understandable, only
that it is portable, fast, and believed to be correct.

Jim Gettys
Digital Equipment Corporation
Cambridge Research Laboratory