culors 1.6.0

Rust port of the culori color library. Color spaces, CSS Color Module 4 parsing, interpolation, gamut mapping, ΔE, blending, filters.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159

//! Ported tests for the Display P3 color space.
//!
//! Reference values produced by culori 4.0.2:
//! `c.xyz65({mode:'p3', r, g, b})`.

use culors::spaces::{Xyz65, P3};
use culors::ColorSpace;

#[path = "common/mod.rs"]
mod common;

const EPS: f64 = 1e-12;

#[test]
fn p3_metadata() {
    assert_eq!(P3::CHANNELS, &["r", "g", "b"]);
    assert_eq!(P3::MODE, "p3");
}

#[test]
fn p3_white_to_xyz65() {
    let white = P3 {
        r: 1.0,
        g: 1.0,
        b: 1.0,
        alpha: None,
    };
    let xyz = white.to_xyz65();
    common::assert_close(xyz.x, 0.9504559270516715, EPS);
    common::assert_close(xyz.y, 0.9999999999999999, EPS);
    common::assert_close(xyz.z, 1.0890577507598787, EPS);
}

#[test]
fn p3_black_to_xyz65() {
    let black = P3 {
        r: 0.0,
        g: 0.0,
        b: 0.0,
        alpha: None,
    };
    let xyz = black.to_xyz65();
    common::assert_close(xyz.x, 0.0, 1e-15);
    common::assert_close(xyz.y, 0.0, 1e-15);
    common::assert_close(xyz.z, 0.0, 1e-15);
}

#[test]
fn p3_red_primary() {
    let red = P3 {
        r: 1.0,
        g: 0.0,
        b: 0.0,
        alpha: None,
    };
    let xyz = red.to_xyz65();
    common::assert_close(xyz.x, 0.486570948648216, EPS);
    common::assert_close(xyz.y, 0.2289745640697487, EPS);
    common::assert_close(xyz.z, 0.0, 1e-15);
}

#[test]
fn p3_green_primary() {
    let green = P3 {
        r: 0.0,
        g: 1.0,
        b: 0.0,
        alpha: None,
    };
    let xyz = green.to_xyz65();
    common::assert_close(xyz.x, 0.265667693169093, EPS);
    common::assert_close(xyz.y, 0.6917385218365062, EPS);
    common::assert_close(xyz.z, 0.0451133818589026, EPS);
}

#[test]
fn p3_blue_primary() {
    let blue = P3 {
        r: 0.0,
        g: 0.0,
        b: 1.0,
        alpha: None,
    };
    let xyz = blue.to_xyz65();
    common::assert_close(xyz.x, 0.1982172852343625, EPS);
    common::assert_close(xyz.y, 0.079286914093745, EPS);
    common::assert_close(xyz.z, 1.043944368900976, EPS);
}

#[test]
fn p3_mid_gray() {
    let c = P3 {
        r: 0.5,
        g: 0.5,
        b: 0.5,
        alpha: None,
    };
    let xyz = c.to_xyz65();
    common::assert_close(xyz.x, 0.2034366706042374, EPS);
    common::assert_close(xyz.y, 0.21404114048223252, EPS);
    common::assert_close(xyz.z, 0.23310316302365938, EPS);
}

#[test]
fn p3_arbitrary_value_matches_culori() {
    // c.xyz65({mode:'p3', r:0.25, g:0.4, b:0.75})
    let c = P3 {
        r: 0.25,
        g: 0.4,
        b: 0.75,
        alpha: None,
    };
    let xyz = c.to_xyz65();
    common::assert_close(xyz.x, 0.16362645087165187, EPS);
    common::assert_close(xyz.y, 0.144988588022814, EPS);
    common::assert_close(xyz.z, 0.5514775732218992, EPS);
}

#[test]
fn p3_round_trip_through_xyz65() {
    let c = P3 {
        r: 0.25,
        g: 0.4,
        b: 0.75,
        alpha: None,
    };
    let back = P3::from_xyz65(c.to_xyz65());
    common::assert_close(back.r, 0.25, 1e-10);
    common::assert_close(back.g, 0.4, 1e-10);
    common::assert_close(back.b, 0.75, 1e-10);
}

#[test]
fn p3_alpha_preserved() {
    let c = P3 {
        r: 0.5,
        g: 0.5,
        b: 0.5,
        alpha: Some(0.7),
    };
    let xyz = c.to_xyz65();
    assert_eq!(xyz.alpha, Some(0.7));
    let back = P3::from_xyz65(xyz);
    assert_eq!(back.alpha, Some(0.7));
}

#[test]
fn xyz65_to_p3_white() {
    let xyz = Xyz65 {
        x: 0.9504559270516715,
        y: 1.0,
        z: 1.0890577507598787,
        alpha: None,
    };
    let p3 = P3::from_xyz65(xyz);
    common::assert_close(p3.r, 1.0, 1e-10);
    common::assert_close(p3.g, 1.0, 1e-10);
    common::assert_close(p3.b, 1.0, 1e-10);
}