Struct LoadedFont 

pub struct LoadedFont {
    pub atlas_slot: usize,
    pub metrics: FontMetrics,
    pub atlas_w: u32,
    pub atlas_h: u32,
    pub size_px: f32,
    pub cap_px: f32,
    pub supersample: f32,
}

Per-font data kept in memory after init() so step() can build text quads each frame.

Fields

atlas_slot: usize

Index into the backend’s text atlas texture array.

metrics: FontMetrics

Per-glyph metrics keyed by Unicode code point.

atlas_w: u32

Atlas width in pixels.

atlas_h: u32

Atlas height in pixels.

size_px: f32

Rasterisation height (px) used to position glyphs vertically.

cap_px: f32

Cap height (logical px): the bearing of an uppercase reference glyph, used to vertically center the visible text within its line box. The full em (size_px) is taller than the visible glyphs, so centering on the em alone leaves a gap above the caps; centering the cap band fixes that.

supersample: f32

Atlas supersample factor: glyph atlas_w/atlas_h are stored in atlas texels, which are this many times larger than the glyph’s size in logical (layout) pixels. The on-screen quad divides by it so the text lays out at its requested size while the extra texels supersample the glyph.