Struct font_kit::metrics::Metrics [−][src]
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, }
Expand description
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
Auto Trait Implementations
impl RefUnwindSafe for Metrics
impl UnwindSafe for Metrics
Blanket Implementations
Mutably borrows from an owned value. Read more