How to get units_per_em of a font

[floppyhammer]

I'm trying to convert GlyphPosition::hori_advance to something in pixels. I suppose I can get what I want by doing

hori_advance * font_size / units_per_em

But I'm struck at getting units_per_em. Am I missing something?

[wezm]

units_per_em is in the head table. If you have a Font you can do something like this:

    let head = font.head_table()
        .expect("unable to parse head table")
        .expect("font lacks a head table");
    println!("units per em: {}", head.units_per_em);

[floppyhammer]

Thanks!