Struct font_kit::metrics::Metrics

pub struct Metrics {
    pub units_per_em: u32,
    pub ascent: f32,
    pub descent: f32,
    pub line_gap: f32,
    pub underline_position: f32,
    pub underline_thickness: f32,
    pub cap_height: f32,
    pub x_height: f32,
    pub bounding_box: RectF,
}

Various metrics that apply to the entire font.

For OpenType fonts, these mostly come from the OS/2 table.

Fields

units_per_em: u32

The number of font units per em.

Font sizes are usually expressed in pixels per em; e.g. 12px means 12 pixels per em.

ascent: f32

The maximum amount the font rises above the baseline, in font units.

descent: f32

The maximum amount the font descends below the baseline, in font units.

NB: This is typically a negative value to match the definition of sTypoDescender in the OS/2 table in the OpenType specification. If you are used to using Windows or Mac APIs, beware, as the sign is reversed from what those APIs return.

line_gap: f32

Distance between baselines, in font units.

underline_position: f32

The suggested distance of the top of the underline from the baseline (negative values indicate below baseline), in font units.

underline_thickness: f32

A suggested value for the underline thickness, in font units.

cap_height: f32

The approximate amount that uppercase letters rise above the baseline, in font units.

x_height: f32

The approximate amount that non-ascending lowercase letters rise above the baseline, in font units.

bounding_box: RectF

A rectangle that surrounds all bounding boxes of all glyphs, in font units.

This corresponds to the xMin/xMax/yMin/yMax values in the OpenType head table.

Trait Implementations

impl Clone for Metrics

fn clone(&self) -> Metrics

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Metrics

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Copy for Metrics