The traditional way to compose the graphical things that make up fonts, whether as outlines or as strokes, is to concatenate sequences of lines, arcs, and Bézier curves.
I’ve thought about alternatives including decomposing those shapes into splines and sine waves. Now it occurs to me that maybe CIC filters would also be a reasonable kind of way to decompose those shapes.
The idea is that the path of a paintbrush painting the letter is some kind of f(t) = (x, y) parametric curve, and CIC filters are capable of producing fairly interesting parametric curves at pretty low computational expense. Maybe stroke width should also be part of it.