Shape's outline

[CoffeeStraw]

Have a way to obtain shape's outline as a shape could be used for border textures or some particular border animations.
Adding options for edges mode (bevel, miter, round) would be nice.

[Youka]

Possibly the most difficult and slowest operation of common vector graphics.
Splitting a shape/path into sub-paths, for each sub path getting offset lines/curves of both sides (using orthogonal vectors for left+right of points) in opposite order (completing two circuits for winded filling) and joining them sounds easy but results in a lot of branching with different horizontal & vertical width and multiple join modes.
Furthermore you'll get a stroke at the end which overlaps halfway with the filling of your shape so an additional masking is required which leads to pixels operations... hell of an effort for fancy border effects.
I'd put it to "nice-to-have". Did it in Yutils but will do it better in SSB (WIP).