moxcms/
xyy.rs

1/*
2 * // Copyright (c) Radzivon Bartoshyk 8/2025. All rights reserved.
3 * //
4 * // Redistribution and use in source and binary forms, with or without modification,
5 * // are permitted provided that the following conditions are met:
6 * //
7 * // 1.  Redistributions of source code must retain the above copyright notice, this
8 * // list of conditions and the following disclaimer.
9 * //
10 * // 2.  Redistributions in binary form must reproduce the above copyright notice,
11 * // this list of conditions and the following disclaimer in the documentation
12 * // and/or other materials provided with the distribution.
13 * //
14 * // 3.  Neither the name of the copyright holder nor the names of its
15 * // contributors may be used to endorse or promote products derived from
16 * // this software without specific prior written permission.
17 * //
18 * // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19 * // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
21 * // DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
22 * // FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * // DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
24 * // SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
25 * // CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
26 * // OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
27 * // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29use crate::{Xyz, Xyzd};
30
31/// Holds CIE XyY representation
32#[derive(Clone, Debug, Copy, Default)]
33pub struct XyY {
34    pub x: f64,
35    pub y: f64,
36    pub yb: f64,
37}
38
39pub trait XyYRepresentable {
40    fn to_xyy(self) -> XyY;
41}
42
43impl XyYRepresentable for XyY {
44    #[inline]
45    fn to_xyy(self) -> XyY {
46        self
47    }
48}
49
50impl XyY {
51    #[inline]
52    pub const fn new(x: f64, y: f64, yb: f64) -> Self {
53        Self { x, y, yb }
54    }
55
56    #[inline]
57    pub const fn to_xyz(self) -> Xyz {
58        let reciprocal = if self.y != 0. {
59            1. / self.y * self.yb
60        } else {
61            0.
62        };
63        Xyz {
64            x: (self.x * reciprocal) as f32,
65            y: self.yb as f32,
66            z: ((1. - self.x - self.y) * reciprocal) as f32,
67        }
68    }
69
70    #[inline]
71    pub const fn to_xyzd(self) -> Xyzd {
72        let reciprocal = if self.y != 0. {
73            1. / self.y * self.yb
74        } else {
75            0.
76        };
77        Xyzd {
78            x: self.x * reciprocal,
79            y: self.yb,
80            z: (1. - self.x - self.y) * reciprocal,
81        }
82    }
83}
84
85#[cfg(test)]
86mod tests {
87    use super::*;
88
89    #[test]
90    fn test_xyzd_xyy() {
91        let xyy = XyY::new(0.2, 0.4, 0.5);
92        let xyy = xyy.to_xyzd();
93        let r_xyy = xyy.to_xyzd();
94        assert!((r_xyy.x - xyy.x).abs() < 1e-5);
95        assert!((r_xyy.y - xyy.y).abs() < 1e-5);
96        assert!((r_xyy.z - xyy.z).abs() < 1e-5);
97    }
98}
moxcms/xyy.rs

moxcms/
xyy.rs
