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fractional-scale: implement accurate rounding

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This commit is contained in:
Julian Orth 2024-10-22 11:11:29 +02:00
parent cc426a0a4a
commit e2806a6337
5 changed files with 41 additions and 14 deletions
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13
src/scale.rs
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@ -1,6 +1,7 @@
use std::fmt::{Debug, Display, Formatter};
const BASE: u32 = 120;
const BASE64: i64 = BASE as i64;
const BASEF: f64 = BASE as f64;
#[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
@ -38,15 +39,13 @@ impl Scale {
self.0
}
pub fn pixel_size(self, width: i32, height: i32) -> (i32, i32) {
#[inline(always)]
pub fn pixel_size<const N: usize>(self, v: [i32; N]) -> [i32; N] {
if self == Scale::default() {
return (width, height);
return v;
}
let scale = self.to_f64();
(
(width as f64 * scale).round() as i32,
(height as f64 * scale).round() as i32,
)
let scale = self.0 as i64;
v.map(|v| ((v as i64 * scale + BASE64 / 2) / BASE64) as i32)
}
}