Signed loop area in texels²: positive for a filled region's outline, negative for a hole's.
Total loop length in texels.
Vertex positions as flat [x0, y0, x1, y1, ...], texel units.
[x0, y0, x1, y1, ...]
Normalized arc length (0..1) at each vertex.
Signed loop area in texels²: positive for a filled region's
outline, negative for a hole's.