zng_ext_font

Struct FontFaceMetrics

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pub struct FontFaceMetrics {
    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 bounds: Rect<f32, ()>,
}
Expand description

Various metrics that apply to the entire FontFace.

For OpenType fonts, these mostly come from the OS/2 table.

See the FreeType Glyph Metrics documentation for an explanation of the various metrics.

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§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.

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.

§bounds: Rect<f32, ()>

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.

Implementations§

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impl FontFaceMetrics

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pub fn sized(&self, font_size_px: Px) -> FontMetrics

Compute FontMetrics given a font size in pixels.

Trait Implementations§

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impl Clone for FontFaceMetrics

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fn clone(&self) -> FontFaceMetrics

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for FontFaceMetrics

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

Formats the value using the given formatter. Read more
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impl<'de> Deserialize<'de> for FontFaceMetrics

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fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>
where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer. Read more
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impl<'a> From<Face<'a>> for FontFaceMetrics

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fn from(f: Face<'a>) -> Self

Converts to this type from the input type.
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impl Serialize for FontFaceMetrics

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fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>
where __S: Serializer,

Serialize this value into the given Serde serializer. Read more

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