Function tiny_skia::path_geometry::chop_cubic_at_y_extrema

pub fn chop_cubic_at_y_extrema(src: &[Point; 4], dst: &mut [Point; 10]) -> usize

Given 4 points on a cubic bezier, chop it into 1, 2, 3 beziers such that the resulting beziers are monotonic in Y.

This is called by the scan converter.

Depending on what is returned, dst[] is treated as follows:

• 0: dst[0..3] is the original cubic
• 1: dst[0..3] and dst[3..6] are the two new cubics
• 2: dst[0..3], dst[3..6], dst[6..9] are the three new cubics