Struct Metrics 

pub struct Metrics {
    units_per_em: f32,
    ascent: f32,
    descent: f32,
    line_gap: f32,
}

A face’s vertical metrics, in font units — the size-independent numbers a row’s height and a glyph’s baseline are derived from.

Which table they come from is the shaper’s font reader’s business: it follows FreeType’s rule (OS/2 typo metrics when the face asks for them, hhea otherwise), which is the rule the desktop’s engine follows too, so a row is the same height on both.

Fields

units_per_em: f32

ascent: f32

descent: f32

line_gap: f32

Implementations

impl Metrics

pub fn of(typeface: FontChoice) -> Self

Panics

If the typeface’s embedded bytes are not a font this can read.

pub fn units_per_em(self) -> f32

pub fn scale(self, font: &Font) -> f32

Font units to points at font’s size.

pub fn ascent(self, font: &Font) -> f32

How far the baseline sits below the line’s top edge.

pub fn descent(self, font: &Font) -> f32

How far the face descends below the baseline — negative, as the face states it.

pub fn row_height(self, font: &Font) -> f32

A line’s height, whether or not a glyph sits on it.

Trait Implementations

impl Clone for Metrics

fn clone(&self) -> Metrics

Returns a duplicate 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 PartialEq for Metrics

fn eq(&self, other: &Metrics) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for Metrics

impl StructuralPartialEq for Metrics