#[derive(Debug, Default, Clone, Copy, PartialEq, Eq, Hash, PartialOrd, Ord)]
pub struct Color {
pub r: u8,
pub g: u8,
pub b: u8,
pub a: u8,
}
impl Color {
pub const fn rgba(r: u8, g: u8, b: u8, a: u8) -> Self {
Self { r, g, b, a }
}
pub const fn rgb(r: u8, g: u8, b: u8) -> Self {
Self::rgba(r, g, b, 255)
}
pub const fn rgba_hex(hex: u32) -> Self {
Self::rgba(
((hex >> 24) & 0xFF) as u8,
((hex >> 16) & 0xFF) as u8,
((hex >> 8) & 0xFF) as u8,
(hex & 0xFF) as u8,
)
}
pub const fn rgb_hex(hex: u32) -> Self {
Self::rgb(
((hex >> 16) & 0xFF) as u8,
((hex >> 8) & 0xFF) as u8,
(hex & 0xFF) as u8,
)
}
pub const fn to_rgba(self) -> (u8, u8, u8, u8) {
(self.r, self.g, self.b, self.a)
}
pub const fn is_transparent(self) -> bool {
self.a == 0
}
pub fn alpha_blend(self, dst: Self) -> Self {
if dst.a == 0 {
return self;
} else if self.a == 0 {
return dst;
} else if self.a == 0xFF {
return self;
}
fn blend(s: u32, d: u32, a: u32) -> u32 {
s + d - (d * a / (0xFF * 0xFF))
}
let a = blend(
u32::from(self.a) * 0xFF,
u32::from(dst.a) * 0xFF,
u32::from(self.a) * 0xFF,
);
let r = blend(
u32::from(self.r) * u32::from(self.a),
u32::from(dst.r) * u32::from(dst.a),
u32::from(self.a) * 0xFF,
);
let g = blend(
u32::from(self.g) * u32::from(self.a),
u32::from(dst.g) * u32::from(dst.a),
u32::from(self.a) * 0xFF,
);
let b = blend(
u32::from(self.b) * u32::from(self.a),
u32::from(dst.b) * u32::from(dst.a),
u32::from(self.a) * 0xFF,
);
Self {
r: (r * 0xFF * 0xFF / a / 0xFF) as u8,
g: (g * 0xFF * 0xFF / a / 0xFF) as u8,
b: (b * 0xFF * 0xFF / a / 0xFF) as u8,
a: (a / 0xFF) as u8,
}
}
}
impl Color {
pub const ALICE_BLUE: Self = Self::rgb_hex(0xf0f8ff);
pub const ANTIQUE_WHITE: Self = Self::rgb_hex(0xfaebd7);
pub const AQUA: Self = Self::rgb_hex(0x00ffff);
pub const AQUAMARINE: Self = Self::rgb_hex(0x7fffd4);
pub const AZURE: Self = Self::rgb_hex(0xf0ffff);
pub const BEIGE: Self = Self::rgb_hex(0xf5f5dc);
pub const BISQUE: Self = Self::rgb_hex(0xffe4c4);
pub const BLACK: Self = Self::rgb_hex(0x000000);
pub const BLANCHED_ALMOND: Self = Self::rgb_hex(0xffebcd);
pub const BLUE: Self = Self::rgb_hex(0x0000ff);
pub const BLUE_VIOLET: Self = Self::rgb_hex(0x8a2be2);
pub const BROWN: Self = Self::rgb_hex(0xa52a2a);
pub const BURLY_WOOD: Self = Self::rgb_hex(0xdeb887);
pub const CADET_BLUE: Self = Self::rgb_hex(0x5f9ea0);
pub const CHARTREUSE: Self = Self::rgb_hex(0x7fff00);
pub const CHOCOLATE: Self = Self::rgb_hex(0xd2691e);
pub const CORAL: Self = Self::rgb_hex(0xff7f50);
pub const CORNFLOWER_BLUE: Self = Self::rgb_hex(0x6495ed);
pub const CORNSILK: Self = Self::rgb_hex(0xfff8dc);
pub const CRIMSON: Self = Self::rgb_hex(0xdc143c);
pub const CYAN: Self = Self::AQUA;
pub const DARK_BLUE: Self = Self::rgb_hex(0x00008b);
pub const DARK_CYAN: Self = Self::rgb_hex(0x008b8b);
pub const DARK_GOLDENROD: Self = Self::rgb_hex(0xb8860b);
pub const DARK_GRAY: Self = Self::rgb_hex(0xa9a9a9);
pub const DARK_GREEN: Self = Self::rgb_hex(0x006400);
pub const DARK_GREY: Self = Self::DARK_GRAY;
pub const DARK_KHAKI: Self = Self::rgb_hex(0xbdb76b);
pub const DARK_MAGENTA: Self = Self::rgb_hex(0x8b008b);
pub const DARK_OLIVEGREEN: Self = Self::rgb_hex(0x556b2f);
pub const DARK_ORANGE: Self = Self::rgb_hex(0xff8c00);
pub const DARK_ORCHID: Self = Self::rgb_hex(0x9932cc);
pub const DARK_RED: Self = Self::rgb_hex(0x8b0000);
pub const DARK_SALMON: Self = Self::rgb_hex(0xe9967a);
pub const DARK_SEA_GREEN: Self = Self::rgb_hex(0x8fbc8f);
pub const DARK_SLATE_BLUE: Self = Self::rgb_hex(0x483d8b);
pub const DARK_SLATE_GRAY: Self = Self::rgb_hex(0x2f4f4f);
pub const DARK_SLATE_GREY: Self = Self::DARK_SLATE_GRAY;
pub const DARK_TURQUOISE: Self = Self::rgb_hex(0x00ced1);
pub const DARK_VIOLET: Self = Self::rgb_hex(0x9400d3);
pub const DEEP_PINK: Self = Self::rgb_hex(0xff1493);
pub const DEEP_SKY_BLUE: Self = Self::rgb_hex(0x00bfff);
pub const DIM_GRAY: Self = Self::rgb_hex(0x696969);
pub const DIM_GREY: Self = Self::DIM_GRAY;
pub const DODGER_BLUE: Self = Self::rgb_hex(0x1e90ff);
pub const FIRE_BRICK: Self = Self::rgb_hex(0xb22222);
pub const FLORAL_WHITE: Self = Self::rgb_hex(0xfffaf0);
pub const FOREST_GREEN: Self = Self::rgb_hex(0x228b22);
pub const FUCHSIA: Self = Self::rgb_hex(0xff00ff);
pub const GAINSBORO: Self = Self::rgb_hex(0xdcdcdc);
pub const GHOST_WHITE: Self = Self::rgb_hex(0xf8f8ff);
pub const GOLD: Self = Self::rgb_hex(0xffd700);
pub const GOLDEN_ROD: Self = Self::rgb_hex(0xdaa520);
pub const GRAY: Self = Self::rgb_hex(0x808080);
pub const GREEN: Self = Self::rgb_hex(0x008000);
pub const GREEN_YELLOW: Self = Self::rgb_hex(0xadff2f);
pub const GREY: Self = Self::GRAY;
pub const HONEY_DEW: Self = Self::rgb_hex(0xf0fff0);
pub const HOT_PINK: Self = Self::rgb_hex(0xff69b4);
pub const INDIAN_RED: Self = Self::rgb_hex(0xcd5c5c);
pub const INDIGO: Self = Self::rgb_hex(0x4b0082);
pub const IVORY: Self = Self::rgb_hex(0xfffff0);
pub const KHAKI: Self = Self::rgb_hex(0xf0e68c);
pub const LAVENDER: Self = Self::rgb_hex(0xe6e6fa);
pub const LAVENDER_BLUSH: Self = Self::rgb_hex(0xfff0f5);
pub const LAWN_GREEN: Self = Self::rgb_hex(0x7cfc00);
pub const LEMON_CHIFFON: Self = Self::rgb_hex(0xfffacd);
pub const LIGHT_BLUE: Self = Self::rgb_hex(0xadd8e6);
pub const LIGHT_CORAL: Self = Self::rgb_hex(0xf08080);
pub const LIGHT_CYAN: Self = Self::rgb_hex(0xe0ffff);
pub const LIGHT_GOLDEN_ROD_YELLOW: Self = Self::rgb_hex(0xfafad2);
pub const LIGHT_GRAY: Self = Self::rgb_hex(0xd3d3d3);
pub const LIGHT_GREEN: Self = Self::rgb_hex(0x90ee90);
pub const LIGHT_GREY: Self = Self::LIGHT_GRAY;
pub const LIGHT_PINK: Self = Self::rgb_hex(0xffb6c1);
pub const LIGHT_SALMON: Self = Self::rgb_hex(0xffa07a);
pub const LIGHT_SEA_GREEN: Self = Self::rgb_hex(0x20b2aa);
pub const LIGHT_SKY_BLUE: Self = Self::rgb_hex(0x87cefa);
pub const LIGHT_SLATE_GRAY: Self = Self::rgb_hex(0x778899);
pub const LIGHT_SLATE_GREY: Self = Self::LIGHT_SLATE_GRAY;
pub const LIGHT_STEEL_BLUE: Self = Self::rgb_hex(0xb0c4de);
pub const LIGHT_YELLOW: Self = Self::rgb_hex(0xffffe0);
pub const LIME: Self = Self::rgb_hex(0x00ff00);
pub const LIME_GREEN: Self = Self::rgb_hex(0x32cd32);
pub const LINEN: Self = Self::rgb_hex(0xfaf0e6);
pub const MAGENTA: Self = Self::FUCHSIA;
pub const MAROON: Self = Self::rgb_hex(0x800000);
pub const MEDIUM_AQUA_MARINE: Self = Self::rgb_hex(0x66cdaa);
pub const MEDIUM_BLUE: Self = Self::rgb_hex(0x0000cd);
pub const MEDIUM_ORCHID: Self = Self::rgb_hex(0xba55d3);
pub const MEDIUM_PURPLE: Self = Self::rgb_hex(0x9370db);
pub const MEDIUM_SEA_GREEN: Self = Self::rgb_hex(0x3cb371);
pub const MEDIUM_SLATE_BLUE: Self = Self::rgb_hex(0x7b68ee);
pub const MEDIUM_SPRING_GREEN: Self = Self::rgb_hex(0x00fa9a);
pub const MEDIUM_TURQUOISE: Self = Self::rgb_hex(0x48d1cc);
pub const MEDIUM_VIOLET_RED: Self = Self::rgb_hex(0xc71585);
pub const MIDNIGHT_BLUE: Self = Self::rgb_hex(0x191970);
pub const MINT_CREAM: Self = Self::rgb_hex(0xf5fffa);
pub const MISTY_ROSE: Self = Self::rgb_hex(0xffe4e1);
pub const MOCCASIN: Self = Self::rgb_hex(0xffe4b5);
pub const NAVAJO_WHITE: Self = Self::rgb_hex(0xffdead);
pub const NAVY: Self = Self::rgb_hex(0x000080);
pub const OLD_LACE: Self = Self::rgb_hex(0xfdf5e6);
pub const OLIVE: Self = Self::rgb_hex(0x808000);
pub const OLIVE_DRAB: Self = Self::rgb_hex(0x6b8e23);
pub const ORANGE: Self = Self::rgb_hex(0xffa500);
pub const ORANGE_RED: Self = Self::rgb_hex(0xff4500);
pub const ORCHID: Self = Self::rgb_hex(0xda70d6);
pub const PALE_GOLDEN_ROD: Self = Self::rgb_hex(0xeee8aa);
pub const PALE_GREEN: Self = Self::rgb_hex(0x98fb98);
pub const PALE_TURQUOISE: Self = Self::rgb_hex(0xafeeee);
pub const PALE_VIOLET_RED: Self = Self::rgb_hex(0xdb7093);
pub const PAPAYA_WHIP: Self = Self::rgb_hex(0xffefd5);
pub const PEACH_PUFF: Self = Self::rgb_hex(0xffdab9);
pub const PERU: Self = Self::rgb_hex(0xcd853f);
pub const PINK: Self = Self::rgb_hex(0xffc0cb);
pub const PLUM: Self = Self::rgb_hex(0xdda0dd);
pub const POWDER_BLUE: Self = Self::rgb_hex(0xb0e0e6);
pub const PURPLE: Self = Self::rgb_hex(0x800080);
pub const REBECCA_PURPLE: Self = Self::rgb_hex(0x663399);
pub const RED: Self = Self::rgb_hex(0xff0000);
pub const ROSY_BROWN: Self = Self::rgb_hex(0xbc8f8f);
pub const ROYAL_BLUE: Self = Self::rgb_hex(0x4169e1);
pub const SADDLE_BROWN: Self = Self::rgb_hex(0x8b4513);
pub const SALMON: Self = Self::rgb_hex(0xfa8072);
pub const SANDY_BROWN: Self = Self::rgb_hex(0xf4a460);
pub const SEA_GREEN: Self = Self::rgb_hex(0x2e8b57);
pub const SEA_SHELL: Self = Self::rgb_hex(0xfff5ee);
pub const SIENNA: Self = Self::rgb_hex(0xa0522d);
pub const SILVER: Self = Self::rgb_hex(0xc0c0c0);
pub const SKY_BLUE: Self = Self::rgb_hex(0x87ceeb);
pub const SLATE_BLUE: Self = Self::rgb_hex(0x6a5acd);
pub const SLATE_GRAY: Self = Self::rgb_hex(0x708090);
pub const SLATE_GREY: Self = Self::SLATE_GRAY;
pub const SNOW: Self = Self::rgb_hex(0xfffafa);
pub const SPRING_GREEN: Self = Self::rgb_hex(0x00ff7f);
pub const STEEL_BLUE: Self = Self::rgb_hex(0x4682b4);
pub const TAN: Self = Self::rgb_hex(0xd2b48c);
pub const TEAL: Self = Self::rgb_hex(0x008080);
pub const THISTLE: Self = Self::rgb_hex(0xd8bfd8);
pub const TOMATO: Self = Self::rgb_hex(0xff6347);
pub const TRANSPARENT: Self = Self::rgba(0, 0, 0, 0);
pub const TURQUOISE: Self = Self::rgb_hex(0x40e0d0);
pub const VIOLET: Self = Self::rgb_hex(0xee82ee);
pub const WHEAT: Self = Self::rgb_hex(0xf5deb3);
pub const WHITE: Self = Self::rgb_hex(0xffffff);
pub const WHITE_SMOKE: Self = Self::rgb_hex(0xf5f5f5);
pub const YELLOW: Self = Self::rgb_hex(0xffff00);
pub const YELLOW_GREEN: Self = Self::rgb_hex(0x9acd32);
}
impl Color {
pub fn map_hsv<F>(self, f: F) -> Self
where
F: FnOnce(f32, f32, f32) -> (f32, f32, f32),
{
let mut hsv = HsvColor::from_color(self);
(hsv.h, hsv.s, hsv.v) = f(hsv.h, hsv.s, hsv.v);
hsv.to_color()
}
}
#[derive(Debug, Clone, Copy)]
struct HsvColor {
h: f32,
s: f32,
v: f32,
a: u8,
}
impl HsvColor {
fn from_color(c: Color) -> Self {
let r = c.r as f32 / 255.0;
let g = c.g as f32 / 255.0;
let b = c.b as f32 / 255.0;
let max = r.max(g).max(b);
let min = r.min(g).min(b);
let n = max - min;
let s = if max == 0.0 { 0.0 } else { n / max };
let v = max;
let h = if n == 0.0 {
0.0
} else if max == r {
if g < b {
6.0 + g / n - b / n
} else {
(g - b) / n
}
} else if max == g {
2.0 + b / n - r / n
} else {
4.0 + r / n - g / n
} / 6.0;
Self {
h: h * 360.0,
s: s * 100.0,
v: v * 100.0,
a: c.a,
}
}
fn to_color(mut self) -> Color {
self.h = (self.h / 360.0) % 1.0;
if self.h < 0.0 {
self.h += 1.0;
}
self.s = (self.s / 100.0).clamp(0.0, 1.0);
self.v = (self.v / 100.0).clamp(0.0, 1.0);
if self.s == 0.0 {
let v = (self.v * 255.0).round() as u8;
return Color::rgba(v, v, v, self.a);
}
let mut r = self.v;
let mut g = self.v;
let mut b = self.v;
let s = self.s;
let h6 = self.h * 6.0;
let f = h6.fract();
match h6.floor() as usize {
1 => {
r *= 1.0 - s * f;
b *= 1.0 - s;
}
2 => {
r *= 1.0 - s;
b *= 1.0 - s * (1.0 - f);
}
3 => {
r *= 1.0 - s;
g *= 1.0 - s * f;
}
4 => {
r *= 1.0 - s * (1.0 - f);
g *= 1.0 - s;
}
5 => {
g *= 1.0 - s;
b *= 1.0 - s * f;
}
n => {
debug_assert!(n == 0 || n == 6, "n: {n}");
g *= 1.0 - s * (1.0 - f);
b *= 1.0 - s;
}
}
Color::rgba(
(r * 255.0).round() as u8,
(g * 255.0).round() as u8,
(b * 255.0).round() as u8,
self.a,
)
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn alpha_blend_works() {
let black = Color::rgba(0, 0, 0, 255);
assert_eq!(black, black.alpha_blend(black));
let transparent = Color::rgba(0, 0, 0, 0);
assert_eq!(transparent, transparent.alpha_blend(transparent));
assert_eq!(black, transparent.alpha_blend(black));
assert_eq!(black, black.alpha_blend(transparent));
}
}