palette/macros/
color_difference.rs

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1macro_rules! impl_euclidean_distance {
2    (
3        $ty: ident
4        {$($component: ident),+}
5        $(where $($where: tt)+)?
6    ) => {
7        // add empty generics brackets
8        impl_euclidean_distance!($ty<> {$($component),+} $(where $($where)+)?);
9    };
10    (
11        $ty: ident <$($ty_param: ident),*>
12        {$($component: ident),+}
13        $(where $($where: tt)+)?
14    ) => {
15        impl<$($ty_param,)* T> crate::color_difference::EuclideanDistance for $ty<$($ty_param,)* T>
16        where
17            T: crate::num::Real + core::ops::Sub<T, Output=T> + core::ops::Add<T, Output=T> + core::ops::Mul<T, Output=T> + Clone,
18            $($($where)+)?
19        {
20            type Scalar = T;
21
22            #[inline]
23            fn distance_squared(self, other: Self) -> Self::Scalar {
24                let difference = self - other;
25                let difference_squared = difference.clone() * difference;
26
27                strip_plus!($(+ difference_squared.$component)+)
28            }
29        }
30    };
31}
32
33macro_rules! impl_hyab {
34    (
35        $ty: ident
36        {$($components: tt)+}
37        $(where $($where: tt)+)?
38    ) => {
39        // add empty generics brackets
40        impl_hyab!($ty<> {$($components)+} $(where $($where)+)?);
41    };
42    (
43        $ty: ident <$($ty_param: ident),*>
44        {lightness: $lightness:ident, chroma1: $chroma1:ident, chroma2: $chroma2:ident $(,)? }
45        $(where $($where: tt)+)?
46    ) => {
47        impl<$($ty_param,)* T> crate::color_difference::HyAb for $ty<$($ty_param,)* T>
48        where
49            T: crate::num::Real + crate::num::Abs + crate::num::Sqrt + core::ops::Sub<T, Output=T> + core::ops::Add<T, Output=T> + core::ops::Mul<T, Output=T> + Clone,
50            $($($where)+)?
51        {
52            type Scalar = T;
53
54            #[inline]
55            fn hybrid_distance(self, other: Self) -> Self::Scalar {
56                let lightness = self.$lightness - other.$lightness;
57                let chroma1 = self.$chroma1 - other.$chroma1;
58                let chroma2 = self.$chroma2 - other.$chroma2;
59
60                lightness.abs() + (chroma1.clone() * chroma1 + chroma2.clone() * chroma2).sqrt()
61            }
62        }
63    };
64}
palette/macros/color_difference.rs

palette/macros/
color_difference.rs
