Struct Font

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pub struct Font { /* private fields */ }

Expand description

A loaded font, ready for shaping and rasterization.

Constructed from raw TTF/OTF bytes via Font::from_bytes. The data is reference-counted so fonts can be cheaply shared and saved across frames.

An optional fallback font can be chained via Font::with_fallback; when a glyph is missing from the primary font (glyph_id == 0 after shaping), the fallback is consulted for both the glyph outline and advance width.

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impl Font

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pub fn from_bytes(data: Vec<u8>) -> Result<Self, &'static str>

Parse a font from raw TTF/OTF bytes.

Returns Err if the data is not a valid font.

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pub fn from_slice(data: &[u8]) -> Result<Self, &'static str>

Parse a font from a borrowed byte slice (data is copied).

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pub fn with_fallback(self, fallback: Arc) -> Self

Chain a fallback font consulted when this font lacks a glyph.

Returns self so it can be used as a builder method:

let font = Font::from_slice(MAIN_BYTES)?.with_fallback(Arc::new(emoji_font));

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pub fn units_per_em(&self) -> u16

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pub fn ascender_px(&self, size: f64) -> f64

Ascender height in pixels at the given font size.

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pub fn descender_px(&self, size: f64) -> f64

Descender depth in pixels at the given font size (positive value).

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pub fn line_height_px(&self, size: f64) -> f64

Recommended line height in pixels at the given font size.

Auto Trait Implementations§

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impl UnwindSafe for Font

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

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where T: ?Sized,

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fn borrow(&self) -> &T

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impl<T> BorrowMut<T> for T
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fn borrow_mut(&mut self) -> &mut T

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Converts Rc<Trait> (where Trait: Downcast) to Rc<Any>, which can then be further downcast into Rc<ConcreteType> where ConcreteType implements Trait.

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fn from(t: T) -> T

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

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