Struct BitmapFont 

pub struct BitmapFont { /* private fields */ }

A fixed-pitch bitmap font.

Implementations

impl BitmapFont

pub fn glyph(&self, ch: char) -> &Glyph

The glyph for ch, or the missing-character box.

Examples found in repository

examples/fontdump.rs (line 7)

fn main() {
    for line in std::env::args().skip(1) {
        let mut rows = vec![String::new(); font::CELL_HEIGHT as usize];
        for ch in line.chars() {
            let g = font::BUILT_IN.glyph(ch);
            for (i, row) in rows.iter_mut().enumerate() {
                for x in 0..font::CELL_WIDTH {
                    row.push(if g[i] & (0x80 >> x) != 0 { '#' } else { '.' });
                }
                row.push('.');
            }
        }
        for r in rows {
            println!("{r}");
        }
        println!();
    }
}

pub fn contains(&self, ch: char) -> bool

Returns true if ch has a glyph of its own.

pub fn line_width(&self, line: &str, scale: i32) -> i32

Width of one line of text, excluding the trailing inter-glyph gap.

The gap is excluded so that centring text in a button actually centres the ink rather than leaving it a pixel left of true.

pub fn measure(&self, text: &str, scale: i32) -> Size

Extent of text, honouring \n.

pub const fn caret_offset(&self, index: usize, scale: i32) -> i32

Horizontal offset of the glyph at character index index.

Fixed pitch, so this is multiplication rather than a layout pass — which is exactly why a text field’s caret arithmetic is trivial here and will stop being trivial when M4 brings proportional fonts.

Trait Implementations

impl Clone for BitmapFont

fn clone(&self) -> BitmapFont

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for BitmapFont

impl Debug for BitmapFont

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

Formats the value using the given formatter.