Function authored_h 

pub fn authored_h(authored: f64, sizes: &[f32], text_scale: f32) -> f64

An authored 1× height grown by exactly the extra room its text lines (sizes) need at text_scale, snapped up to a whole pixel: the design exactly at 1× (a 28 px row stays 28, not 16.25 + 12 = 28.25), and at 2× grown by the lines’ growth alone.