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#[cfg(feature = "palette")]
use palette::rgb::{Srgb, Srgba};
#[derive(Debug, Clone, Copy, PartialEq, Default)]
pub struct Color {
pub r: f32,
pub g: f32,
pub b: f32,
pub a: f32,
}
impl Color {
pub const BLACK: Color = Color {
r: 0.0,
g: 0.0,
b: 0.0,
a: 1.0,
};
pub const WHITE: Color = Color {
r: 1.0,
g: 1.0,
b: 1.0,
a: 1.0,
};
pub const TRANSPARENT: Color = Color {
r: 0.0,
g: 0.0,
b: 0.0,
a: 0.0,
};
pub fn new(r: f32, g: f32, b: f32, a: f32) -> Color {
debug_assert!(
(0.0..=1.0).contains(&r),
"Red component must be on [0, 1]"
);
debug_assert!(
(0.0..=1.0).contains(&g),
"Green component must be on [0, 1]"
);
debug_assert!(
(0.0..=1.0).contains(&b),
"Blue component must be on [0, 1]"
);
debug_assert!(
(0.0..=1.0).contains(&a),
"Alpha component must be on [0, 1]"
);
Color { r, g, b, a }
}
pub const fn from_rgb(r: f32, g: f32, b: f32) -> Color {
Color::from_rgba(r, g, b, 1.0f32)
}
pub const fn from_rgba(r: f32, g: f32, b: f32, a: f32) -> Color {
Color { r, g, b, a }
}
pub fn from_rgb8(r: u8, g: u8, b: u8) -> Color {
Color::from_rgba8(r, g, b, 1.0)
}
pub fn from_rgba8(r: u8, g: u8, b: u8, a: f32) -> Color {
Color {
r: f32::from(r) / 255.0,
g: f32::from(g) / 255.0,
b: f32::from(b) / 255.0,
a,
}
}
#[must_use]
pub fn into_rgba8(self) -> [u8; 4] {
[
(self.r * 255.0).round() as u8,
(self.g * 255.0).round() as u8,
(self.b * 255.0).round() as u8,
(self.a * 255.0).round() as u8,
]
}
pub fn into_linear(self) -> [f32; 4] {
fn linear_component(u: f32) -> f32 {
if u < 0.04045 {
u / 12.92
} else {
((u + 0.055) / 1.055).powf(2.4)
}
}
[
linear_component(self.r),
linear_component(self.g),
linear_component(self.b),
self.a,
]
}
pub fn invert(&mut self) {
self.r = 1.0f32 - self.r;
self.b = 1.0f32 - self.g;
self.g = 1.0f32 - self.b;
}
pub fn inverse(self) -> Color {
Color::new(1.0f32 - self.r, 1.0f32 - self.g, 1.0f32 - self.b, self.a)
}
}
impl From<[f32; 3]> for Color {
fn from([r, g, b]: [f32; 3]) -> Self {
Color::new(r, g, b, 1.0)
}
}
impl From<[f32; 4]> for Color {
fn from([r, g, b, a]: [f32; 4]) -> Self {
Color::new(r, g, b, a)
}
}
#[macro_export]
macro_rules! color {
($r:expr, $g:expr, $b:expr) => {
$crate::Color::from_rgb8($r, $g, $b)
};
($r:expr, $g:expr, $b:expr, $a:expr) => {
$crate::Color::from_rgba8($r, $g, $b, $a)
};
($hex:expr) => {{
let hex = $hex as u32;
let r = (hex & 0xff0000) >> 16;
let g = (hex & 0xff00) >> 8;
let b = (hex & 0xff);
$crate::Color::from_rgb8(r as u8, g as u8, b as u8)
}};
($hex:expr, $a:expr) => {{
let hex = $hex as u32;
let r = (hex & 0xff0000) >> 16;
let g = (hex & 0xff00) >> 8;
let b = (hex & 0xff);
$crate::Color::from_rgba8(r as u8, g as u8, b as u8, $a)
}};
}
#[cfg(feature = "palette")]
impl From<Srgba> for Color {
fn from(srgba: Srgba) -> Self {
Color::new(srgba.red, srgba.green, srgba.blue, srgba.alpha)
}
}
#[cfg(feature = "palette")]
impl From<Color> for Srgba {
fn from(c: Color) -> Self {
Srgba::new(c.r, c.g, c.b, c.a)
}
}
#[cfg(feature = "palette")]
impl From<Srgb> for Color {
fn from(srgb: Srgb) -> Self {
Color::new(srgb.red, srgb.green, srgb.blue, 1.0)
}
}
#[cfg(feature = "palette")]
impl From<Color> for Srgb {
fn from(c: Color) -> Self {
Srgb::new(c.r, c.g, c.b)
}
}
#[cfg(feature = "palette")]
#[cfg(test)]
mod tests {
use super::*;
use palette::Blend;
#[test]
fn srgba_traits() {
let c = Color::from_rgb(0.5, 0.4, 0.3);
let s: Srgba = c.into();
let r: Color = s.into();
assert_eq!(c, r);
}
#[test]
fn color_manipulation() {
let c1 = Color::from_rgb(0.5, 0.4, 0.3);
let c2 = Color::from_rgb(0.2, 0.5, 0.3);
let l1 = Srgba::from(c1).into_linear();
let l2 = Srgba::from(c2).into_linear();
let lighter = l1.lighten(l2);
let r: Color = Srgba::from_linear(lighter).into();
assert_eq!(
r,
Color {
r: 0.5,
g: 0.5,
b: 0.3,
a: 1.0
}
);
}
}