Trait Font

Source

pub trait Font: Send + Sync {
    // Required methods
    fn advance(&self) -> u32;
    fn line_height(&self) -> u32;
    fn draw_glyph(&self, ch: char, draw_pixel: &mut dyn FnMut(i32, i32));
}

Expand description

Trait for custom font providers.

Consumers can implement this trait on custom font types (e.g. anti-aliased fonts, vector text generators, external BDF/PSF font decoders, TTF parsers) and use FontId::Dynamic or FontId::from to pass them to text styling.

Required Methods§

Source

fn advance(&self) -> u32

Character horizontal advance in pixels.

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fn line_height(&self) -> u32

Vertical line height in pixels.

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fn draw_glyph(&self, ch: char, draw_pixel: &mut dyn FnMut(i32, i32))

Render a single glyph by calling draw_pixel(dx, dy) for each active pixel in the glyph, where (dx, dy) are relative coordinates within the glyph bounding box.