procmod_overlay/
color.rs

1/// An RGBA color with 8-bit components.
2#[derive(Debug, Clone, Copy, PartialEq, Eq)]
3pub struct Color {
4    pub r: u8,
5    pub g: u8,
6    pub b: u8,
7    pub a: u8,
8}
9
10impl Color {
11    pub const fn rgba(r: u8, g: u8, b: u8, a: u8) -> Self {
12        Self { r, g, b, a }
13    }
14
15    pub const fn rgb(r: u8, g: u8, b: u8) -> Self {
16        Self { r, g, b, a: 255 }
17    }
18
19    #[allow(dead_code)]
20    pub(crate) fn to_f32_array(self) -> [f32; 4] {
21        [
22            self.r as f32 / 255.0,
23            self.g as f32 / 255.0,
24            self.b as f32 / 255.0,
25            self.a as f32 / 255.0,
26        ]
27    }
28
29    pub const RED: Self = Self::rgb(255, 0, 0);
30    pub const GREEN: Self = Self::rgb(0, 255, 0);
31    pub const BLUE: Self = Self::rgb(0, 0, 255);
32    pub const WHITE: Self = Self::rgb(255, 255, 255);
33    pub const BLACK: Self = Self::rgb(0, 0, 0);
34    pub const YELLOW: Self = Self::rgb(255, 255, 0);
35    pub const CYAN: Self = Self::rgb(0, 255, 255);
36    pub const MAGENTA: Self = Self::rgb(255, 0, 255);
37    pub const TRANSPARENT: Self = Self::rgba(0, 0, 0, 0);
38}
39
40#[cfg(test)]
41mod tests {
42    use super::*;
43
44    #[test]
45    fn rgb_sets_full_alpha() {
46        let c = Color::rgb(10, 20, 30);
47        assert_eq!(c.a, 255);
48    }
49
50    #[test]
51    fn rgba_preserves_all_channels() {
52        let c = Color::rgba(10, 20, 30, 40);
53        assert_eq!((c.r, c.g, c.b, c.a), (10, 20, 30, 40));
54    }
55
56    #[test]
57    fn to_f32_array_normalizes() {
58        let c = Color::rgba(255, 0, 128, 255);
59        let f = c.to_f32_array();
60        assert!((f[0] - 1.0).abs() < f32::EPSILON);
61        assert!((f[1] - 0.0).abs() < f32::EPSILON);
62        assert!((f[2] - 128.0 / 255.0).abs() < 0.001);
63        assert!((f[3] - 1.0).abs() < f32::EPSILON);
64    }
65
66    #[test]
67    fn constants_are_correct() {
68        assert_eq!(Color::RED, Color::rgb(255, 0, 0));
69        assert_eq!(Color::TRANSPARENT, Color::rgba(0, 0, 0, 0));
70    }
71}
procmod_overlay/color.rs

procmod_overlay/
color.rs
