44 lines
1.6 KiB
Rust
44 lines
1.6 KiB
Rust
use pc_screen_font;
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// Note that currently the Font and Glyph traits are fairly specialized to PSF.
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// They will certainly have to be modified to support other types of fonts,
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// but they *work* for now, and that's what's important/
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pub trait Font {
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// Once Rust supports existential types, this needs to be an existential type.
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type Glyph: Glyph;
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/// The size, in pixels, of the bounding box of each glyph in this font.
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fn bounding_box(&self) -> (usize, usize);
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fn lookup<'a>(&'a self, ch: char) -> Option<&'a Self::Glyph>;
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}
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pub trait Glyph {
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/// The width, in pixels, of this specific glyph.
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/// This may be a different size than the font's bounding box.
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fn width(&self) -> usize;
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/// The height, in pixels, of this specific glyph.
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/// This may be a different size than the font's bounding box.
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fn height(&self) -> usize;
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// TODO: Support glyph offsets relative to the font bounding box.
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/// Check whether an individual pixel of this glyph is set.
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/// This function will panic if `x` and `y` are outside the width and height of this glyph.
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fn get(&self, x: usize, y: usize) -> bool;
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}
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impl Font for pc_screen_font::Font {
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type Glyph = pc_screen_font::Glyph;
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fn bounding_box(&self) -> (usize, usize) { self.bounding_box() }
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fn lookup<'a>(&'a self, ch: char) -> Option<&'a Self::Glyph> { self.lookup(ch) }
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}
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impl Glyph for pc_screen_font::Glyph {
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fn width(&self) -> usize { self.width() }
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fn height(&self) -> usize { self.height() }
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fn get(&self, x: usize, y: usize) -> bool { self.get(x, y).unwrap() }
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}
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