Struct BitmapFont 

pub struct BitmapFont {
    pub glyph_width: u8,
    pub glyph_height: u8,
    pub scale: u8,
    pub data: &'static [u8],
}

A fixed-width bitmap font with 1-bit packed glyph data.

Each glyph occupies glyph_width * glyph_height bits, stored row-major with the MSB of each byte mapping to the leftmost pixel. Glyphs cover ASCII codepoints 0x20 through 0x7E (95 characters).

Fields

glyph_width: u8

Width of each glyph in pixels.

glyph_height: u8

Height of each glyph in pixels.

scale: u8

Pixel scale factor (1 = native, 2 = double, etc.).

data: &'static [u8]

Row-major, 1-bit-per-pixel packed glyph data for ASCII 0x20..=0x7E.

Implementations

impl BitmapFont

pub fn scaled_width(&self) -> i32

Scaled glyph width in display pixels.

pub fn scaled_height(&self) -> i32

Scaled glyph height in display pixels.

pub fn draw_char( &self, renderer: &mut dyn Renderer, x: i32, y: i32, ch: char, color: Color, )

Render a single character at (x, y).

pub fn draw_str( &self, renderer: &mut dyn Renderer, x: i32, y: i32, text: &str, color: Color, )

Render a string at (x, y) advancing horizontally (increasing x).

pub fn draw_str_y( &self, renderer: &mut dyn Renderer, x: i32, y: i32, text: &str, color: Color, )

Render a string advancing along the Y axis (for rotated displays).

Glyphs remain upright but each character is placed at increasing Y, allowing horizontal text on a display where fb Y = physical horizontal.

Trait Implementations

impl FontMetrics for BitmapFont

fn glyph_metrics(&self, ch: char) -> Option<GlyphInfo>

Return per-glyph advance and extent information for ch.

fn line_metrics(&self) -> FontLineMetrics

Return font-level vertical metrics.

fn glyph_coverage_row( &self, ch: char, row: u16, x_offset: u16, coverage: &mut [u8], ) -> bool

Fill one row of glyph coverage for ch.

fn measure_fp16(&self, text: &str) -> i32

Measure the advance width of text in 1/16 pixel units.

fn shape(&self, text: &str, origin: (i32, i32)) -> ShapedText<'_>

where Self: Sized,

Shape text into an LTR ShapedText run at origin.