Function hint_outline 

pub(crate) fn hint_outline(
    outline: &mut Outline,
    metrics: &UnscaledStyleMetrics,
    scale: &Scale,
    glyph_style: Option<GlyphStyle>,
) -> HintedMetrics

Applies the complete hinting process to a latin outline.

See https://gitlab.freedesktop.org/freetype/freetype/-/blob/57617782464411201ce7bbc93b086c1b4d7d84a5/src/autofit/aflatin.c#L3554