use bevy::color::{Alpha, Color, Srgba};
#[inline(always)]
pub fn lighten_color(color: Color, factor: f32) -> Color {
let Srgba {
red,
green,
blue,
alpha,
} = color.to_srgba();
Color::srgb(
(red + factor).min(1.0),
(green + factor).min(1.0),
(blue + factor).min(1.0),
)
.with_alpha(alpha)
}
#[inline(always)]
pub fn darken_color(color: Color, factor: f32) -> Color {
let Srgba {
red,
green,
blue,
alpha,
} = color.to_srgba();
Color::srgb(
(red - factor).max(0.0),
(green - factor).max(0.0),
(blue - factor).max(0.0),
)
.with_alpha(alpha)
}
pub fn parse_color(i: &str) -> Result<Color, String> {
let input = i.trim().to_ascii_lowercase();
if let Some(color) = parse_named_color(&input) {
return Ok(color);
}
if input.starts_with('#') {
return parse_hex_color(&input);
}
if input.starts_with("rgb(") {
return parse_rgb(&input, false);
}
if input.starts_with("rgba(") {
return parse_rgb(&input, true);
}
if input.starts_with("hsl(") {
return parse_hsl(&input, false);
}
if input.starts_with("hsla(") {
return parse_hsl(&input, true);
}
Err(format!("Unknown color '{input}'"))
}
fn parse_hex_color(s: &str) -> Result<Color, String> {
let hex = &s[1..];
fn nibble(c: char) -> Result<u8, String> {
c.to_digit(16)
.map(|v| v as u8)
.ok_or_else(|| format!("Invalid hex digit '{c}'"))
}
fn byte(s: &str) -> Result<u8, String> {
u8::from_str_radix(s, 16).map_err(|_| format!("Invalid hex byte '{s}'"))
}
match hex.len() {
3 => {
let mut chars = hex.chars();
let r = nibble(chars.next().unwrap())?;
let g = nibble(chars.next().unwrap())?;
let b = nibble(chars.next().unwrap())?;
Ok(Color::srgba_u8(r * 17, g * 17, b * 17, 255))
}
4 => {
let mut chars = hex.chars();
let r = nibble(chars.next().unwrap())?;
let g = nibble(chars.next().unwrap())?;
let b = nibble(chars.next().unwrap())?;
let a = nibble(chars.next().unwrap())?;
Ok(Color::srgba_u8(r * 17, g * 17, b * 17, a * 17))
}
6 => Ok(Color::srgba_u8(
byte(&hex[0..2])?,
byte(&hex[2..4])?,
byte(&hex[4..6])?,
255,
)),
8 => Ok(Color::srgba_u8(
byte(&hex[0..2])?,
byte(&hex[2..4])?,
byte(&hex[4..6])?,
byte(&hex[6..8])?,
)),
_ => Err("Invalid hex color.".into()),
}
}
fn parse_rgb(s: &str, alpha: bool) -> Result<Color, String> {
let start = s.find('(').unwrap() + 1;
let end = s.rfind(')').ok_or("Missing ')'")?;
let values: Vec<_> = s[start..end].split(',').map(str::trim).collect();
let expected = if alpha { 4 } else { 3 };
if values.len() != expected {
return Err(format!("Expected {expected} values."));
}
fn parse_channel(s: &str) -> Result<f32, String> {
if let Some(v) = s.strip_suffix('%') {
Ok(v.parse::<f32>().map_err(|_| "Bad percentage")? / 100.0)
} else {
Ok(s.parse::<f32>().map_err(|_| "Bad value")? / 255.0)
}
}
fn parse_alpha(s: &str) -> Result<f32, String> {
if let Some(v) = s.strip_suffix('%') {
Ok(v.parse::<f32>().map_err(|_| "Bad alpha")? / 100.0)
} else {
s.parse::<f32>().map_err(|_| "Bad alpha".into())
}
}
let r = parse_channel(values[0])?;
let g = parse_channel(values[1])?;
let b = parse_channel(values[2])?;
let a = if alpha { parse_alpha(values[3])? } else { 1.0 };
Ok(Color::srgba(r, g, b, a))
}
fn parse_hsl(s: &str, alpha: bool) -> Result<Color, String> {
let start = s.find('(').unwrap() + 1;
let end = s.rfind(')').ok_or("Missing ')'")?;
let values: Vec<_> = s[start..end].split(',').map(str::trim).collect();
let expected = if alpha { 4 } else { 3 };
if values.len() != expected {
return Err(format!("Expected {expected} values."));
}
let h = values[0].parse::<f32>().map_err(|_| "Invalid hue")?;
let s = values[1]
.trim_end_matches('%')
.parse::<f32>()
.map_err(|_| "Invalid saturation")?
/ 100.0;
let l = values[2]
.trim_end_matches('%')
.parse::<f32>()
.map_err(|_| "Invalid lightness")?
/ 100.0;
let a = if alpha {
values[3].parse::<f32>().map_err(|_| "Invalid alpha")?
} else {
1.0
};
Ok(Color::hsla(h, s, l, a))
}
fn parse_named_color(name: &str) -> Option<Color> {
let (r, g, b, a) = match name.trim().to_ascii_lowercase().as_str() {
"transparent" => (0, 0, 0, 0),
"black" => (0x00, 0x00, 0x00, 0xFF),
"silver" => (0xC0, 0xC0, 0xC0, 0xFF),
"gray" | "grey" => (0x80, 0x80, 0x80, 0xFF),
"white" => (0xFF, 0xFF, 0xFF, 0xFF),
"maroon" => (0x80, 0x00, 0x00, 0xFF),
"red" => (0xFF, 0x00, 0x00, 0xFF),
"purple" => (0x80, 0x00, 0x80, 0xFF),
"fuchsia" | "magenta" => (0xFF, 0x00, 0xFF, 0xFF),
"green" => (0x00, 0x80, 0x00, 0xFF),
"lime" => (0x00, 0xFF, 0x00, 0xFF),
"olive" => (0x80, 0x80, 0x00, 0xFF),
"yellow" => (0xFF, 0xFF, 0x00, 0xFF),
"navy" => (0x00, 0x00, 0x80, 0xFF),
"blue" => (0x00, 0x00, 0xFF, 0xFF),
"teal" => (0x00, 0x80, 0x80, 0xFF),
"aqua" | "cyan" => (0x00, 0xFF, 0xFF, 0xFF),
"aliceblue" => (0xF0, 0xF8, 0xFF, 0xFF),
"antiquewhite" => (0xFA, 0xEB, 0xD7, 0xFF),
"aquamarine" => (0x7F, 0xFF, 0xD4, 0xFF),
"azure" => (0xF0, 0xFF, 0xFF, 0xFF),
"beige" => (0xF5, 0xF5, 0xDC, 0xFF),
"bisque" => (0xFF, 0xE4, 0xC4, 0xFF),
"blanchedalmond" => (0xFF, 0xEB, 0xCD, 0xFF),
"blueviolet" => (0x8A, 0x2B, 0xE2, 0xFF),
"brown" => (0xA5, 0x2A, 0x2A, 0xFF),
"burlywood" => (0xDE, 0xB8, 0x87, 0xFF),
"cadetblue" => (0x5F, 0x9E, 0xA0, 0xFF),
"chartreuse" => (0x7F, 0xFF, 0x00, 0xFF),
"chocolate" => (0xD2, 0x69, 0x1E, 0xFF),
"coral" => (0xFF, 0x7F, 0x50, 0xFF),
"cornflowerblue" => (0x64, 0x95, 0xED, 0xFF),
"cornsilk" => (0xFF, 0xF8, 0xDC, 0xFF),
"crimson" => (0xDC, 0x14, 0x3C, 0xFF),
"darkblue" => (0x00, 0x00, 0x8B, 0xFF),
"darkcyan" => (0x00, 0x8B, 0x8B, 0xFF),
"darkgoldenrod" => (0xB8, 0x86, 0x0B, 0xFF),
"darkgray" | "darkgrey" => (0xA9, 0xA9, 0xA9, 0xFF),
"darkgreen" => (0x00, 0x64, 0x00, 0xFF),
"darkkhaki" => (0xBD, 0xB7, 0x6B, 0xFF),
"darkmagenta" => (0x8B, 0x00, 0x8B, 0xFF),
"darkolivegreen" => (0x55, 0x6B, 0x2F, 0xFF),
"darkorange" => (0xFF, 0x8C, 0x00, 0xFF),
"darkorchid" => (0x99, 0x32, 0xCC, 0xFF),
"darkred" => (0x8B, 0x00, 0x00, 0xFF),
"darksalmon" => (0xE9, 0x96, 0x7A, 0xFF),
"darkseagreen" => (0x8F, 0xBC, 0x8F, 0xFF),
"darkslateblue" => (0x48, 0x3D, 0x8B, 0xFF),
"darkslategray" | "darkslategrey" => (0x2F, 0x4F, 0x4F, 0xFF),
"darkturquoise" => (0x00, 0xCE, 0xD1, 0xFF),
"darkviolet" => (0x94, 0x00, 0xD3, 0xFF),
"deeppink" => (0xFF, 0x14, 0x93, 0xFF),
"deepskyblue" => (0x00, 0xBF, 0xFF, 0xFF),
"dimgray" | "dimgrey" => (0x69, 0x69, 0x69, 0xFF),
"dodgerblue" => (0x1E, 0x90, 0xFF, 0xFF),
"firebrick" => (0xB2, 0x22, 0x22, 0xFF),
"floralwhite" => (0xFF, 0xFA, 0xF0, 0xFF),
"forestgreen" => (0x22, 0x8B, 0x22, 0xFF),
"gainsboro" => (0xDC, 0xDC, 0xDC, 0xFF),
"ghostwhite" => (0xF8, 0xF8, 0xFF, 0xFF),
"gold" => (0xFF, 0xD7, 0x00, 0xFF),
"goldenrod" => (0xDA, 0xA5, 0x20, 0xFF),
"greenyellow" => (0xAD, 0xFF, 0x2F, 0xFF),
"honeydew" => (0xF0, 0xFF, 0xF0, 0xFF),
"hotpink" => (0xFF, 0x69, 0xB4, 0xFF),
"indianred" => (0xCD, 0x5C, 0x5C, 0xFF),
"indigo" => (0x4B, 0x00, 0x82, 0xFF),
"ivory" => (0xFF, 0xFF, 0xF0, 0xFF),
"khaki" => (0xF0, 0xE6, 0x8C, 0xFF),
"lavender" => (0xE6, 0xE6, 0xFA, 0xFF),
"lavenderblush" => (0xFF, 0xF0, 0xF5, 0xFF),
"lawngreen" => (0x7C, 0xFC, 0x00, 0xFF),
"lemonchiffon" => (0xFF, 0xFA, 0xCD, 0xFF),
"lightblue" => (0xAD, 0xD8, 0xE6, 0xFF),
"lightcoral" => (0xF0, 0x80, 0x80, 0xFF),
"lightcyan" => (0xE0, 0xFF, 0xFF, 0xFF),
"lightgoldenrodyellow" => (0xFA, 0xFA, 0xD2, 0xFF),
"lightgray" | "lightgrey" => (0xD3, 0xD3, 0xD3, 0xFF),
"lightgreen" => (0x90, 0xEE, 0x90, 0xFF),
"lightpink" => (0xFF, 0xB6, 0xC1, 0xFF),
"lightsalmon" => (0xFF, 0xA0, 0x7A, 0xFF),
"lightseagreen" => (0x20, 0xB2, 0xAA, 0xFF),
"lightskyblue" => (0x87, 0xCE, 0xFA, 0xFF),
"lightslategray" | "lightslategrey" => (0x77, 0x88, 0x99, 0xFF),
"lightsteelblue" => (0xB0, 0xC4, 0xDE, 0xFF),
"lightyellow" => (0xFF, 0xFF, 0xE0, 0xFF),
"limegreen" => (0x32, 0xCD, 0x32, 0xFF),
"linen" => (0xFA, 0xF0, 0xE6, 0xFF),
"mediumaquamarine" => (0x66, 0xCD, 0xAA, 0xFF),
"mediumblue" => (0x00, 0x00, 0xCD, 0xFF),
"mediumorchid" => (0xBA, 0x55, 0xD3, 0xFF),
"mediumpurple" => (0x93, 0x70, 0xDB, 0xFF),
"mediumseagreen" => (0x3C, 0xB3, 0x71, 0xFF),
"mediumslateblue" => (0x7B, 0x68, 0xEE, 0xFF),
"mediumspringgreen" => (0x00, 0xFA, 0x9A, 0xFF),
"mediumturquoise" => (0x48, 0xD1, 0xCC, 0xFF),
"mediumvioletred" => (0xC7, 0x15, 0x85, 0xFF),
"midnightblue" => (0x19, 0x19, 0x70, 0xFF),
"mintcream" => (0xF5, 0xFF, 0xFA, 0xFF),
"mistyrose" => (0xFF, 0xE4, 0xE1, 0xFF),
"moccasin" => (0xFF, 0xE4, 0xB5, 0xFF),
"navajowhite" => (0xFF, 0xDE, 0xAD, 0xFF),
"oldlace" => (0xFD, 0xF5, 0xE6, 0xFF),
"olivedrab" => (0x6B, 0x8E, 0x23, 0xFF),
"orange" => (0xFF, 0xA5, 0x00, 0xFF),
"orangered" => (0xFF, 0x45, 0x00, 0xFF),
"orchid" => (0xDA, 0x70, 0xD6, 0xFF),
"palegoldenrod" => (0xEE, 0xE8, 0xAA, 0xFF),
"palegreen" => (0x98, 0xFB, 0x98, 0xFF),
"paleturquoise" => (0xAF, 0xEE, 0xEE, 0xFF),
"palevioletred" => (0xDB, 0x70, 0x93, 0xFF),
"papayawhip" => (0xFF, 0xEF, 0xD5, 0xFF),
"peachpuff" => (0xFF, 0xDA, 0xB9, 0xFF),
"peru" => (0xCD, 0x85, 0x3F, 0xFF),
"pink" => (0xFF, 0xC0, 0xCB, 0xFF),
"plum" => (0xDD, 0xA0, 0xDD, 0xFF),
"powderblue" => (0xB0, 0xE0, 0xE6, 0xFF),
"rebeccapurple" => (0x66, 0x33, 0x99, 0xFF),
"rosybrown" => (0xBC, 0x8F, 0x8F, 0xFF),
"royalblue" => (0x41, 0x69, 0xE1, 0xFF),
"saddlebrown" => (0x8B, 0x45, 0x13, 0xFF),
"salmon" => (0xFA, 0x80, 0x72, 0xFF),
"sandybrown" => (0xF4, 0xA4, 0x60, 0xFF),
"seagreen" => (0x2E, 0x8B, 0x57, 0xFF),
"seashell" => (0xFF, 0xF5, 0xEE, 0xFF),
"sienna" => (0xA0, 0x52, 0x2D, 0xFF),
"skyblue" => (0x87, 0xCE, 0xEB, 0xFF),
"slateblue" => (0x6A, 0x5A, 0xCD, 0xFF),
"slategray" | "slategrey" => (0x70, 0x80, 0x90, 0xFF),
"snow" => (0xFF, 0xFA, 0xFA, 0xFF),
"springgreen" => (0x00, 0xFF, 0x7F, 0xFF),
"steelblue" => (0x46, 0x82, 0xB4, 0xFF),
"tan" => (0xD2, 0xB4, 0x8C, 0xFF),
"thistle" => (0xD8, 0xBF, 0xD8, 0xFF),
"tomato" => (0xFF, 0x63, 0x47, 0xFF),
"turquoise" => (0x40, 0xE0, 0xD0, 0xFF),
"violet" => (0xEE, 0x82, 0xEE, 0xFF),
"wheat" => (0xF5, 0xDE, 0xB3, 0xFF),
"whitesmoke" => (0xF5, 0xF5, 0xF5, 0xFF),
"yellowgreen" => (0x9A, 0xCD, 0x32, 0xFF),
_ => return None,
};
Some(Color::srgba_u8(r, g, b, a))
}