Struct ScaledMetrics 

pub struct ScaledMetrics<'a, S>
where
    S: Scale,
{
    metrics: &'a Metrics,
    scale: S,
}

Measurements of a font as a whole, in a caller’s own units.

A view rather than a set of scaled fields, so reading one measurement does not compute the rest. What carries no unit, such as the glyph count, is reported unchanged.

Fields

metrics: &'a Metrics

scale: S

Implementations

impl<'a, S> ScaledMetrics<'a, S>

where S: Scale,

pub fn num_glyphs(&self) -> u32

Returns the number of glyphs in the font.

pub fn units_per_em(&self) -> u16

Returns the size of the font’s design em.

pub fn bounds(&self) -> BoundingBox<<S as Scale>::Value>

Returns the box enclosing every glyph in the font.

pub fn h_line(&self) -> Option<LineBox<<S as Scale>::Value>>

Returns the ascender, descender and gap for horizontal text.

Resolved as Metrics::h_line resolves it, with each end scaled on its own so that a caller subtracting them gets the height the glyph metrics report for a font that stacks by this line.

pub fn hhea_line(&self) -> Option<LineBox<<S as Scale>::Value>>

Returns the line hhea provides.

pub fn typo_line(&self) -> Option<LineBox<<S as Scale>::Value>>

Returns the typographic line OS/2 provides.

pub fn use_typo_metrics(&self) -> bool

Returns whether the font asks for its typographic line to be read.

pub fn vhea_line(&self) -> Option<LineBox<<S as Scale>::Value>>

Returns the line vhea provides, where the font has one.

A vertical line runs across the page, so its measurements scale along x where a horizontal line’s scale along y.

pub fn x_height(&self) -> Option<<S as Scale>::Value>

Returns the height of a lowercase letter, where the font provides one.

pub fn cap_height(&self) -> Option<<S as Scale>::Value>

Returns the height of a capital letter, where the font provides one.

pub fn max_h_advance(&self) -> Option<<S as Scale>::Value>

Returns the widest advance in the font, where it provides one.

pub fn max_v_advance(&self) -> Option<<S as Scale>::Value>

Returns the tallest advance in the font, where it provides one.

pub fn average_char_width(&self) -> Option<<S as Scale>::Value>

Returns the average advance in the font, where it provides one.

pub fn win_line(&self) -> Option<LineExtents<<S as Scale>::Value>>

Returns the line outside which the font asks not to be clipped.

Trait Implementations

impl<'a, S> Clone for ScaledMetrics<'a, S>

where S: Clone + Scale,

fn clone(&self) -> ScaledMetrics<'a, S>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<'a, S> Copy for ScaledMetrics<'a, S>

where S: Copy + Scale,