Struct FontVerticalMetrics 

pub struct FontVerticalMetrics {
    pub units_per_em: u16,
    pub ascender: i16,
    pub descender: i16,
    pub line_gap: i16,
}

Font-wide vertical metrics needed to compute line height, in font design units.

This is a deliberately minimal, font-library-agnostic mirror of the ascender/descender/line-gap fields found in a font’s hhea/OS/2 tables. Higher layers (e.g. the oxitext facade) translate their font library’s richer metrics type into this struct so the layout engine stays free of any font-parser dependency.

Convert to pixels with value * (font_size_px / units_per_em).

Fields

units_per_em: u16

Design units per em (typically 1000 for CFF, 2048 for TrueType).

ascender: i16

Typographic ascender in design units (positive, above baseline).

descender: i16

Typographic descender in design units (negative, below baseline).

line_gap: i16

Typographic line gap (extra leading between lines), in design units.

Implementations

impl FontVerticalMetrics

pub fn ascent_px(&self, font_size_px: f32) -> f32

Returns the pixel ascent (always positive) at font_size_px.

pub fn descent_px(&self, font_size_px: f32) -> f32

Returns the pixel descent depth (always positive) at font_size_px.

pub fn line_gap_px(&self, font_size_px: f32) -> f32

Returns the pixel line gap at font_size_px.

Trait Implementations

impl Clone for FontVerticalMetrics

fn clone(&self) -> FontVerticalMetrics

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for FontVerticalMetrics

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

Formats the value using the given formatter.

impl PartialEq for FontVerticalMetrics

fn eq(&self, other: &FontVerticalMetrics) -> 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 FontVerticalMetrics

impl Eq for FontVerticalMetrics

impl StructuralPartialEq for FontVerticalMetrics