Function compute_unscaled_style_metrics 

pub(crate) fn compute_unscaled_style_metrics(
    shaper: &Shaper<'_>,
    coords: &[F2Dot14],
    style: &StyleClass,
) -> UnscaledStyleMetrics

Computes unscaled metrics for the Latin writing system.

See https://gitlab.freedesktop.org/freetype/freetype/-/blob/57617782464411201ce7bbc93b086c1b4d7d84a5/src/autofit/aflatin.c#L1134