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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280
// cmy.rs CMY color model.
//
// Copyright (c) 2020 Douglas P Lau
//
//! [CMY] color model and types.
//!
//! [cmy]: https://en.wikipedia.org/wiki/CMY_color_model
use crate::chan::{
Ch16, Ch32, Ch8, Channel, Linear, Premultiplied, Srgb, Straight,
};
use crate::el::{Pix3, Pix4, PixRgba, Pixel};
use crate::ColorModel;
use std::ops::Range;
/// [CMY] subtractive [color model].
///
/// The components are *[cyan]*, *[magenta]*, *[yellow]* and optional *[alpha]*.
///
/// [alpha]: ../el/trait.Pixel.html#method.alpha
/// [cmy]: https://en.wikipedia.org/wiki/CMY_color_model
/// [color model]: ../trait.ColorModel.html
/// [cyan]: #method.cyan
/// [magenta]: #method.magenta
/// [yellow]: #method.yellow
#[derive(Clone, Copy, Debug, Default, PartialEq)]
pub struct Cmy {}
impl Cmy {
/// Get the *cyan* component.
///
/// # Example: Get CMY Cyan
/// ```
/// use pix::cmy::{Cmy, Cmy8};
/// use pix::chan::Ch8;
///
/// let p = Cmy8::new(0x93, 0x80, 0xA0);
/// assert_eq!(Cmy::cyan(p), Ch8::new(0x93));
/// ```
pub fn cyan<P: Pixel>(p: P) -> P::Chan
where
P: Pixel<Model = Self>,
{
p.one()
}
/// Get a mutable reference to the *cyan* component.
///
/// # Example: Modify CMY Cyan
/// ```
/// use pix::cmy::{Cmy, Cmy8};
/// use pix::chan::Ch8;
///
/// let mut p = Cmy8::new(0x88, 0x77, 0x66);
/// *Cmy::cyan_mut(&mut p) = 0x55.into();
/// assert_eq!(Cmy::cyan(p), Ch8::new(0x55));
/// ```
pub fn cyan_mut<P: Pixel>(p: &mut P) -> &mut P::Chan
where
P: Pixel<Model = Self>,
{
p.one_mut()
}
/// Get the *magenta* component.
///
/// # Example: CMY Magenta
/// ```
/// use pix::cmy::{Cmy, Cmy16};
/// use pix::chan::Ch16;
///
/// let p = Cmy16::new(0x2000, 0x1234, 0x8000);
/// assert_eq!(Cmy::magenta(p), Ch16::new(0x1234));
/// ```
pub fn magenta<P: Pixel>(p: P) -> P::Chan
where
P: Pixel<Model = Self>,
{
p.two()
}
/// Get a mutable reference to the *magenta* component.
///
/// # Example: Modify CMY Magenta
/// ```
/// use pix::cmy::{Cmy, Cmy16};
/// use pix::chan::Ch16;
///
/// let mut p = Cmy16::new(0x2000, 0x1234, 0x8000);
/// *Cmy::magenta_mut(&mut p) = 0x4321.into();
/// assert_eq!(Cmy::magenta(p), Ch16::new(0x4321));
/// ```
pub fn magenta_mut<P: Pixel>(p: &mut P) -> &mut P::Chan
where
P: Pixel<Model = Self>,
{
p.two_mut()
}
/// Get the *yellow* component.
///
/// # Example: CMY Yellow
/// ```
/// use pix::cmy::{Cmy, Cmy32};
/// use pix::chan::Ch32;
///
/// let p = Cmy32::new(0.25, 0.5, 1.0);
/// assert_eq!(Cmy::yellow(p), Ch32::new(1.0));
/// ```
pub fn yellow<P: Pixel>(p: P) -> P::Chan
where
P: Pixel<Model = Self>,
{
p.three()
}
/// Get a mutable reference to the *yellow* component.
///
/// # Example: Modify CMY Yellow
/// ```
/// use pix::cmy::{Cmy, Cmy32};
/// use pix::chan::Ch32;
///
/// let mut p = Cmy32::new(0.25, 0.5, 1.0);
/// *Cmy::yellow_mut(&mut p) = Ch32::new(0.75);
/// assert_eq!(Cmy::yellow(p), Ch32::new(0.75));
/// ```
pub fn yellow_mut<P: Pixel>(p: &mut P) -> &mut P::Chan
where
P: Pixel<Model = Self>,
{
p.three_mut()
}
}
impl ColorModel for Cmy {
const CIRCULAR: Range<usize> = 0..0;
const LINEAR: Range<usize> = 0..3;
const ALPHA: usize = 3;
/// Convert into *red*, *green*, *blue* and *alpha* components
fn into_rgba<P>(p: P) -> PixRgba<P>
where
P: Pixel<Model = Self>,
{
let red = P::Chan::MAX - Cmy::cyan(p);
let green = P::Chan::MAX - Cmy::magenta(p);
let blue = P::Chan::MAX - Cmy::yellow(p);
PixRgba::<P>::new::<P::Chan>(red, green, blue, p.alpha())
}
/// Convert from *red*, *green*, *blue* and *alpha* components
fn from_rgba<P>(rgba: PixRgba<P>) -> P
where
P: Pixel<Model = Self>,
{
let chan = rgba.channels();
let cyan = P::Chan::MAX - chan[0];
let magenta = P::Chan::MAX - chan[1];
let yellow = P::Chan::MAX - chan[2];
let alpha = chan[3];
P::from_channels(&[cyan, magenta, yellow, alpha])
}
}
/// [Cmy](struct.Cmy.html) 8-bit opaque (no *alpha* channel)
/// [linear](../chan/struct.Linear.html) gamma [pixel](../el/trait.Pixel.html)
/// format.
pub type Cmy8 = Pix3<Ch8, Cmy, Straight, Linear>;
/// [Cmy](struct.Cmy.html) 16-bit opaque (no *alpha* channel)
/// [linear](../chan/struct.Linear.html) gamma [pixel](../el/trait.Pixel.html)
/// format.
pub type Cmy16 = Pix3<Ch16, Cmy, Straight, Linear>;
/// [Cmy](struct.Cmy.html) 32-bit opaque (no *alpha* channel)
/// [linear](../chan/struct.Linear.html) gamma [pixel](../el/trait.Pixel.html)
/// format.
pub type Cmy32 = Pix3<Ch32, Cmy, Straight, Linear>;
/// [Cmy](struct.Cmy.html) 8-bit [straight](../chan/struct.Straight.html)
/// alpha [linear](../chan/struct.Linear.html)
/// gamma [pixel](../el/trait.Pixel.html) format.
pub type Cmya8 = Pix4<Ch8, Cmy, Straight, Linear>;
/// [Cmy](struct.Cmy.html) 16-bit [straight](../chan/struct.Straight.html)
/// alpha [linear](../chan/struct.Linear.html) gamma
/// [pixel](../el/trait.Pixel.html) format.
pub type Cmya16 = Pix4<Ch16, Cmy, Straight, Linear>;
/// [Cmy](struct.Cmy.html) 32-bit [straight](../chan/struct.Straight.html)
/// alpha [linear](../chan/struct.Linear.html) gamma
/// [pixel](../el/trait.Pixel.html) format.
pub type Cmya32 = Pix4<Ch32, Cmy, Straight, Linear>;
/// [Cmy](struct.Cmy.html) 8-bit
/// [premultiplied](../chan/struct.Premultiplied.html) alpha
/// [linear](../chan/struct.Linear.html) gamma [pixel](../el/trait.Pixel.html)
/// format.
pub type Cmya8p = Pix4<Ch8, Cmy, Premultiplied, Linear>;
/// [Cmy](struct.Cmy.html) 16-bit
/// [premultiplied](../chan/struct.Premultiplied.html) alpha
/// [linear](../chan/struct.Linear.html) gamma [pixel](../el/trait.Pixel.html)
/// format.
pub type Cmya16p = Pix4<Ch16, Cmy, Premultiplied, Linear>;
/// [Cmy](struct.Cmy.html) 32-bit
/// [premultiplied](../chan/struct.Premultiplied.html) alpha
/// [linear](../chan/struct.Linear.html) gamma [pixel](../el/trait.Pixel.html)
/// format.
pub type Cmya32p = Pix4<Ch32, Cmy, Premultiplied, Linear>;
/// [Cmy](struct.Cmy.html) 8-bit opaque (no *alpha* channel)
/// [sRGB](../chan/struct.Srgb.html) gamma [pixel](../el/trait.Pixel.html)
/// format.
pub type SCmy8 = Pix3<Ch8, Cmy, Straight, Srgb>;
/// [Cmy](struct.Cmy.html) 16-bit opaque (no *alpha* channel)
/// [sRGB](../chan/struct.Srgb.html) gamma [pixel](../el/trait.Pixel.html)
/// format.
pub type SCmy16 = Pix3<Ch16, Cmy, Straight, Srgb>;
/// [Cmy](struct.Cmy.html) 32-bit opaque (no *alpha* channel)
/// [sRGB](../chan/struct.Srgb.html) gamma [pixel](../el/trait.Pixel.html)
/// format.
pub type SCmy32 = Pix3<Ch32, Cmy, Straight, Srgb>;
/// [Cmy](struct.Cmy.html) 8-bit [straight](../chan/struct.Straight.html)
/// alpha [sRGB](../chan/struct.Srgb.html) gamma [pixel](../el/trait.Pixel.html)
/// format.
pub type SCmya8 = Pix4<Ch8, Cmy, Straight, Srgb>;
/// [Cmy](struct.Cmy.html) 16-bit [straight](../chan/struct.Straight.html)
/// alpha [sRGB](../chan/struct.Srgb.html) gamma [pixel](../el/trait.Pixel.html)
/// format.
pub type SCmya16 = Pix4<Ch16, Cmy, Straight, Srgb>;
/// [Cmy](struct.Cmy.html) 32-bit [straight](../chan/struct.Straight.html)
/// alpha [sRGB](../chan/struct.Srgb.html) gamma [pixel](../el/trait.Pixel.html)
/// format.
pub type SCmya32 = Pix4<Ch32, Cmy, Straight, Srgb>;
/// [Cmy](struct.Cmy.html) 8-bit
/// [premultiplied](../chan/struct.Premultiplied.html) alpha
/// [sRGB](../chan/struct.Srgb.html) gamma [pixel](../el/trait.Pixel.html)
/// format.
pub type SCmya8p = Pix4<Ch8, Cmy, Premultiplied, Srgb>;
/// [Cmy](struct.Cmy.html) 16-bit
/// [premultiplied](../chan/struct.Premultiplied.html) alpha
/// [sRGB](../chan/struct.Srgb.html) gamma [pixel](../el/trait.Pixel.html)
/// format.
pub type SCmya16p = Pix4<Ch16, Cmy, Premultiplied, Srgb>;
/// [Cmy](struct.Cmy.html) 32-bit
/// [premultiplied](../chan/struct.Premultiplied.html) alpha
/// [sRGB](../chan/struct.Srgb.html) gamma [pixel](../el/trait.Pixel.html)
/// format.
pub type SCmya32p = Pix4<Ch32, Cmy, Premultiplied, Srgb>;
#[cfg(test)]
mod test {
use crate::cmy::*;
use crate::el::Pixel;
use crate::rgb::*;
#[test]
fn cmy_to_rgb() {
assert_eq!(Rgb8::new(255, 1, 2), Cmy8::new(0, 254, 253).convert());
assert_eq!(Rgb8::new(255, 255, 0), Cmy32::new(0.0, 0.0, 1.0).convert(),);
assert_eq!(Rgb8::new(0, 0, 255), Cmy16::new(65535, 65535, 0).convert(),);
}
#[test]
fn rgb_to_cmy() {
assert_eq!(Cmy8::new(0, 255, 127), Rgb8::new(255, 0, 128).convert());
assert_eq!(Cmy32::new(1.0, 0.0, 0.0), Rgb8::new(0, 255, 255).convert(),);
assert_eq!(Cmy16::new(0, 65535, 65535), Rgb8::new(255, 0, 0).convert(),);
}
}