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Avoid floating point arithmetic in RGB→8-bit ANSI approximation

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Michal Nazarewicz 2018-08-18 19:40:16 +01:00 committed by David Peter
parent 5b421b455d
commit 5c95b8803b
1 changed files with 2 additions and 6 deletions
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8
src/terminal.rs
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@ -13,14 +13,10 @@ fn rgb2ansi(r: u8, g: u8, b: u8) -> u8 {
} else if r > 248 {
WHITE
} else {
let fr = f32::from(r);
(((fr - 8.) / 247.) * 24.) as u8 + 232
((r - 8) as u16 * 24 / 247) as u8 + 232
}
} else {
let fr = f32::from(r);
let fg = f32::from(g);
let fb = f32::from(b);
16 + (36 * (fr / 255. * 5.) as u8) + (6 * (fg / 255. * 5.) as u8) + (fb / 255. * 5.) as u8
36 * (r / 51) + 6 * (g / 51) + (b / 51) + 16
}
}