Add a function that takes a path, and offsets it
by some distance, applying line-join parameters
as needed. The implementation is reusing the
infrastructure of the stroker.
Implement stroking for paths.
The current implementation does not try to handle short
segments in the vicinity of sharp joins in any special
way, so there can be some artifacts in that situation.
There are special-case implementations for rectangle
and circle contours, since in many cases the outlines
of these contours just consist of two of the same
shapes.
GskPath is a data structure for paths that consists
of contours, which in turn might contain Bézier curves.
The data structure is inspired by Skia, with separate
arrays for points and operations. One advantage of this
arrangement is that start and end points are shared
between adjacent curves.
In addition to the usual contours comprised of Bézier
segments, GskPath supports certain special contours
directly, such as rectangles, rounded rectangles and
circles.
