chromashift/
xyzd50.rs

1use crate::{ToAlpha, XyzD65, round_dp};
2use core::fmt;
3
4/// A colour expressed as X, Y and Z values, expressed in the CIE XYZ tristimulus colour space, with an explicit D50
5/// white point.
6/// The components are:
7/// - X - a number between 0.0 and 100.0
8/// - Y - a number between 0.0 and 100.0
9/// - Z - a number between 0.0 and 100.0
10/// - Alpha - a number between 0.0 and 100.0
11#[derive(Debug, Clone, Copy, PartialEq)]
12pub struct XyzD50 {
13	pub x: f64,
14	pub y: f64,
15	pub z: f64,
16	pub alpha: f32,
17}
18
19impl XyzD50 {
20	pub fn new(x: f64, y: f64, z: f64, alpha: f32) -> Self {
21		Self { x, y, z, alpha: alpha.clamp(0.0, 100.0) }
22	}
23}
24
25impl ToAlpha for XyzD50 {
26	fn to_alpha(&self) -> f32 {
27		self.alpha
28	}
29}
30
31impl fmt::Display for XyzD50 {
32	fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
33		let Self { x, y, z, alpha } = self;
34		write!(f, "color(xyz-d50 {} {}% {}%", round_dp(*x, 4), round_dp(*y, 4), round_dp(*z, 4))?;
35		if *alpha < 100.0 {
36			write!(f, " / {}", round_dp(*alpha as f64, 2))?;
37		}
38		write!(f, ")")
39	}
40}
41
42impl From<XyzD50> for XyzD65 {
43	fn from(value: XyzD50) -> Self {
44		let XyzD50 { x, y, z, alpha } = value;
45		let x_d65 = x * 0.955473421488075 + y * (-0.02309845494876471) + z * 0.06325924320057072;
46		let y_d65 = x * (-0.0283697093338637) + y * 1.0099953980813041 + z * 0.021041441191917323;
47		let z_d65 = x * 0.012314014864481998 + y * (-0.020507649298898964) + z * 1.330365926242124;
48		XyzD65::new(x_d65, y_d65, z_d65, alpha)
49	}
50}
51
52impl From<XyzD65> for XyzD50 {
53	fn from(value: XyzD65) -> Self {
54		let XyzD65 { x, y, z, alpha } = value;
55		let x_d50 = x * 1.0479297925449969 + y * 0.022946870601609652 + z * (-0.05019226628920524);
56		let y_d50 = x * 0.02962780877005599 + y * 0.9904344267538799 + z * (-0.017073799063418826);
57		let z_d50 = x * (-0.009243040646204504) + y * 0.015055191490298152 + z * 0.7518742814281371;
58		XyzD50::new(x_d50, y_d50, z_d50, alpha)
59	}
60}
chromashift/xyzd50.rs

chromashift/
xyzd50.rs
