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
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
use std::ops::*;
#[derive(Default, Debug, PartialEq, Eq, Clone, Hash)]
pub struct RGB<N>(pub N, pub N, pub N);
impl<P> RGB<P> {
pub fn convert_with<Q>(self, mut convert: impl FnMut(P) -> Q) -> RGB<Q> {
let RGB(r, g, b) = self;
RGB(convert(r), convert(g), convert(b))
}
pub fn map_across(
mut quantize: impl FnMut(P) -> (P, P),
) -> impl FnMut(RGB<P>) -> (RGB<P>, RGB<P>) {
move |RGB(r, g, b)| {
let (r_quot, r_rem) = quantize(r);
let (g_quot, g_rem) = quantize(g);
let (b_quot, b_rem) = quantize(b);
let quotient = RGB(r_quot, g_quot, b_quot);
let remainder = RGB(r_rem, g_rem, b_rem);
(quotient, remainder)
}
}
}
impl Copy for RGB<u8> {}
impl Copy for RGB<i8> {}
impl Copy for RGB<i16> {}
impl Copy for RGB<u16> {}
impl<N: Add<Output = N>> Add for RGB<N> {
type Output = Self;
fn add(self, other: Self) -> Self {
let RGB(r0, g0, b0) = self;
let RGB(r1, g1, b1) = other;
RGB(r0 + r1, g0 + g1, b0 + b1)
}
}
impl<N: Sub<Output = N>> Sub for RGB<N> {
type Output = Self;
fn sub(self, other: Self) -> Self {
let RGB(r0, g0, b0) = self;
let RGB(r1, g1, b1) = other;
RGB(r0 - r1, g0 - g1, b0 - b1)
}
}
impl<S: Mul<Output = S> + Copy> Mul<S> for RGB<S> {
type Output = Self;
fn mul(self, s: S) -> Self {
self.convert_with(|c| c * s)
}
}
impl<S: Div<Output = S> + Copy> Div<S> for RGB<S> {
type Output = Self;
fn div(self, s: S) -> Self {
self.convert_with(|c| c / s)
}
}
impl<S: Rem<Output = S> + Copy> Rem<S> for RGB<S> {
type Output = Self;
fn rem(self, s: S) -> Self {
self.convert_with(|c| c % s)
}
}
impl<N: Neg<Output = N>> Neg for RGB<N> {
type Output = Self;
fn neg(self) -> Self {
self.convert_with(|c| -c)
}
}
impl From<RGB<u8>> for RGB<f64> {
fn from(rgb: RGB<u8>) -> Self {
rgb.convert_with(f64::from)
}
}
impl<N: Copy, M: From<N>> From<[N; 3]> for RGB<M> {
fn from(a: [N; 3]) -> Self {
RGB(a[0], a[1], a[2]).convert_with(M::from)
}
}
impl<N, M: From<N>> From<(N, N, N)> for RGB<M> {
fn from((r, g, b): (N, N, N)) -> Self {
RGB(r, g, b).convert_with(M::from)
}
}
impl RGB<f64> {
pub fn to_chroma_corrected_black_and_white(&self) -> f64 {
let RGB(r, g, b) = self;
r * 0.2126 + g * 0.7152 + b * 0.0722
}
}
impl RGB<u8> {
pub const unsafe fn from_hex(hex: u32) -> Self {
super::RGB((hex >> 16) as u8, (hex >> 8) as u8, hex as u8)
}
pub fn from_chroma_corrected_black_and_white(p: f64) -> Self {
let clamp = crate::clamp_f64_to_u8;
RGB(clamp(p), clamp(p), clamp(p))
}
pub fn to_hex(self) -> u32 {
let RGB(r, g, b) = self;
((u32::from(r)) << 16) + (u32::from(g) << 8) + u32::from(b)
}
}
impl std::fmt::LowerHex for RGB<u8> {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
write!(f, "{:06x}", self.clone().to_hex())
}
}
impl std::fmt::UpperHex for RGB<u8> {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
write!(f, "{:06X}", self.clone().to_hex())
}
}
impl<T: From<u8>> std::str::FromStr for RGB<T> {
type Err = super::Error;
fn from_str(s: &str) -> std::result::Result<Self, Self::Err> {
let s = if s.starts_with("0x") || s.starts_with("0X") {
&s[2..]
} else {
s
};
if s.len() != 6 {
return Err(super::Error::RGBParse);
}
if let Ok(n) = u32::from_str_radix(s, 16) {
Ok(RGB(
T::from((n >> 16 & 0xff) as u8),
T::from((n >> 8 & 0xff) as u8),
T::from((n & 0xff) as u8),
))
} else {
Err(super::Error::RGBParse)
}
}
}
#[test]
fn test_rgb_parse() {
assert_eq!("00c200".parse::<RGB<u8>>(), Ok(RGB(0, 0xc2, 00)));
assert_eq!("0xfF0000".parse::<RGB<u8>>(), Ok(RGB(0xff, 0, 0)));
assert!("0xm".parse::<RGB<u8>>().is_err());
assert!("0xffffffff".parse::<RGB<f64>>().is_err());
let rgb: RGB<u8> = RGB(28, 51, 11);
let lowerhex: RGB<u8> = format!("{:x}", rgb).parse().unwrap();
assert_eq!(lowerhex, rgb);
let upperhex: RGB<u8> = format!("{:X}", rgb).parse().unwrap();
assert_eq!(upperhex, rgb);
}
#[test]
fn test_rgb_lowerhex() {
assert_eq!(format!("{:x}", RGB(0x00, 0x00, 0xFF)), "0000ff");
}
#[test]
fn test_rgb_upperhex() {
assert_eq!(format!("{:X}", RGB(0x00, 0xFF, 0x00)), "00FF00");
}