#![allow(clippy::unreadable_literal)]
use super::Rational;
use lazy_static::lazy_static;
use num_traits::{one, One, Signed, Zero};
use std::collections::BTreeMap;
use std::ops::{Add, Div, Sub};
#[derive(Clone, Debug, Eq, Ord, PartialEq, PartialOrd)]
pub struct Rgba {
red: Rational,
green: Rational,
blue: Rational,
alpha: Rational,
}
impl Rgba {
pub fn new(r: Rational, g: Rational, b: Rational, a: Rational) -> Self {
let ff = Rational::new(255, 1);
let one = Rational::one();
Rgba {
red: cap(r, &ff),
green: cap(g, &ff),
blue: cap(b, &ff),
alpha: cap(a, &one),
}
}
pub fn from_rgb(r: u8, g: u8, b: u8) -> Self {
Rgba {
red: Rational::from_integer(r.into()),
green: Rational::from_integer(g.into()),
blue: Rational::from_integer(b.into()),
alpha: Rational::one(),
}
}
pub fn from_rgba(r: u8, g: u8, b: u8, a: u8) -> Self {
Rgba {
red: Rational::from_integer(r.into()),
green: Rational::from_integer(g.into()),
blue: Rational::from_integer(b.into()),
alpha: Rational::from_integer(a.into()) / 255,
}
}
pub fn name(&self) -> Option<&'static str> {
if self.alpha >= Rational::one() {
let (r, g, b, _a) = self.to_bytes();
let c = u32::from_be_bytes([0, r, g, b]);
LOOKUP.v2n.get(&c).copied()
} else {
None
}
}
pub fn from_name(name: &str) -> Option<Self> {
let name = name.to_lowercase();
let name: &str = &name;
if name == "transparent" {
return Some(Self::from_rgba(0, 0, 0, 0));
}
LOOKUP.n2v.get(name).map(|n| {
let [_, r, g, b] = n.to_be_bytes();
Self::from_rgb(r, g, b)
})
}
pub fn all_zero(&self) -> bool {
self.alpha.is_zero()
&& self.red.is_zero()
&& self.green.is_zero()
&& self.blue.is_zero()
}
pub fn to_bytes(&self) -> (u8, u8, u8, u8) {
fn byte(v: Rational) -> u8 {
v.round().to_integer() as u8
}
let a = self.alpha * 255;
(byte(self.red), byte(self.green), byte(self.blue), byte(a))
}
pub fn red(&self) -> Rational {
self.red
}
pub fn green(&self) -> Rational {
self.green
}
pub fn blue(&self) -> Rational {
self.blue
}
pub fn alpha(&self) -> Rational {
self.alpha
}
pub fn set_alpha(&mut self, alpha: Rational) {
self.alpha = cap(alpha, &one())
}
}
fn cap(n: Rational, max: &Rational) -> Rational {
if n > *max {
*max
} else if n.is_negative() {
Rational::zero()
} else {
n
}
}
impl Add<Rational> for &Rgba {
type Output = Rgba;
fn add(self, rhs: Rational) -> Rgba {
Rgba::new(
self.red + rhs,
self.green + rhs,
self.blue + rhs,
self.alpha,
)
}
}
impl Add<&Rgba> for &Rgba {
type Output = Rgba;
fn add(self, rhs: &Rgba) -> Rgba {
Rgba::new(
self.red + rhs.red,
self.green + rhs.green,
self.blue + rhs.blue,
self.alpha + rhs.alpha,
)
}
}
impl<'a> Div<Rational> for &'a Rgba {
type Output = Rgba;
fn div(self, rhs: Rational) -> Rgba {
Rgba::new(
self.red / rhs,
self.green / rhs,
self.blue / rhs,
self.alpha,
)
}
}
impl<'a> Sub<Rational> for &'a Rgba {
type Output = Rgba;
fn sub(self, rhs: Rational) -> Rgba {
Rgba::new(
self.red - rhs,
self.green - rhs,
self.blue - rhs,
self.alpha,
)
}
}
impl<'a> Sub<&'a Rgba> for &'a Rgba {
type Output = Rgba;
fn sub(self, rhs: &'a Rgba) -> Rgba {
Rgba::new(
self.red - rhs.red,
self.green - rhs.green,
self.blue - rhs.blue,
(self.alpha + rhs.alpha) / 2,
)
}
}
#[test]
fn get_black() {
assert_eq!(Rgba::from_rgb(0, 0, 0).name(), Some("black"))
}
#[test]
fn get_none() {
assert_eq!(Rgba::from_rgb(0, 1, 2).name(), None)
}
#[test]
fn get_red_by_name() {
assert_eq!(Some(Rgba::from_rgb(255, 0, 0)), Rgba::from_name("red"));
}
#[test]
fn get_none_by_name() {
assert_eq!(None, Rgba::from_name("xyzzy"));
}
struct Lookup {
n2v: BTreeMap<&'static str, u32>,
v2n: BTreeMap<u32, &'static str>,
}
impl Lookup {
fn from_slice(data: &[(&'static str, u32)]) -> Self {
let mut n2v: BTreeMap<&'static str, u32> = BTreeMap::new();
let mut v2n: BTreeMap<u32, &'static str> = BTreeMap::new();
for &(n, v) in data {
n2v.insert(n, v);
v2n.entry(v).or_insert(n);
}
Lookup { n2v, v2n }
}
}
lazy_static! {
static ref LOOKUP: Lookup = Lookup::from_slice(&[
("aliceblue", 0xf0f8ff_u32),
("antiquewhite", 0xfaebd7),
("aqua", 0x00ffff),
("aquamarine", 0x7fffd4),
("azure", 0xf0ffff),
("beige", 0xf5f5dc),
("bisque", 0xffe4c4),
("black", 0x000000),
("blanchedalmond", 0xffebcd),
("blue", 0x0000ff),
("blueviolet", 0x8a2be2),
("brown", 0xa52a2a),
("burlywood", 0xdeb887),
("cadetblue", 0x5f9ea0),
("chartreuse", 0x7fff00),
("chocolate", 0xd2691e),
("coral", 0xff7f50),
("cornflowerblue", 0x6495ed),
("cornsilk", 0xfff8dc),
("crimson", 0xdc143c),
("cyan", 0x00ffff),
("darkblue", 0x00008b),
("darkcyan", 0x008b8b),
("darkgoldenrod", 0xb8860b),
("darkgray", 0xa9a9a9),
("darkgreen", 0x006400),
("darkgrey", 0xa9a9a9),
("darkkhaki", 0xbdb76b),
("darkmagenta", 0x8b008b),
("darkolivegreen", 0x556b2f),
("darkorange", 0xff8c00),
("darkorchid", 0x9932cc),
("darkred", 0x8b0000),
("darksalmon", 0xe9967a),
("darkseagreen", 0x8fbc8f),
("darkslateblue", 0x483d8b),
("darkslategray", 0x2f4f4f),
("darkslategrey", 0x2f4f4f),
("darkturquoise", 0x00ced1),
("darkviolet", 0x9400d3),
("deeppink", 0xff1493),
("deepskyblue", 0x00bfff),
("dimgrey", 0x696969),
("dimgray", 0x696969),
("dodgerblue", 0x1e90ff),
("firebrick", 0xb22222),
("floralwhite", 0xfffaf0),
("forestgreen", 0x228b22),
("fuchsia", 0xff00ff),
("gainsboro", 0xdcdcdc),
("ghostwhite", 0xf8f8ff),
("gold", 0xffd700),
("goldenrod", 0xdaa520),
("gray", 0x808080),
("green", 0x008000),
("greenyellow", 0xadff2f),
("grey", 0x808080),
("honeydew", 0xf0fff0),
("hotpink", 0xff69b4),
("indianred", 0xcd5c5c),
("indigo", 0x4b0082),
("ivory", 0xfffff0),
("khaki", 0xf0e68c),
("lavender", 0xe6e6fa),
("lavenderblush", 0xfff0f5),
("lawngreen", 0x7cfc00),
("lemonchiffon", 0xfffacd),
("lightblue", 0xadd8e6),
("lightcoral", 0xf08080),
("lightcyan", 0xe0ffff),
("lightgoldenrodyellow", 0xfafad2),
("lightgray", 0xd3d3d3),
("lightgreen", 0x90ee90),
("lightgrey", 0xd3d3d3),
("lightpink", 0xffb6c1),
("lightsalmon", 0xffa07a),
("lightseagreen", 0x20b2aa),
("lightskyblue", 0x87cefa),
("lightslategray", 0x778899),
("lightslategrey", 0x778899),
("lightsteelblue", 0xb0c4de),
("lightyellow", 0xffffe0),
("lime", 0x00ff00),
("limegreen", 0x32cd32),
("linen", 0xfaf0e6),
("magenta", 0xff00ff),
("maroon", 0x800000),
("mediumaquamarine", 0x66cdaa),
("mediumblue", 0x0000cd),
("mediumorchid", 0xba55d3),
("mediumpurple", 0x9370db),
("mediumseagreen", 0x3cb371),
("mediumslateblue", 0x7b68ee),
("mediumspringgreen", 0x00fa9a),
("mediumturquoise", 0x48d1cc),
("mediumvioletred", 0xc71585),
("midnightblue", 0x191970),
("mintcream", 0xf5fffa),
("mistyrose", 0xffe4e1),
("moccasin", 0xffe4b5),
("navajowhite", 0xffdead),
("navy", 0x000080),
("oldlace", 0xfdf5e6),
("olive", 0x808000),
("olivedrab", 0x6b8e23),
("orange", 0xffa500),
("orangered", 0xff4500),
("orchid", 0xda70d6),
("palegoldenrod", 0xeee8aa),
("palegreen", 0x98fb98),
("paleturquoise", 0xafeeee),
("palevioletred", 0xdb7093),
("papayawhip", 0xffefd5),
("peachpuff", 0xffdab9),
("peru", 0xcd853f),
("pink", 0xffc0cb),
("plum", 0xdda0dd),
("powderblue", 0xb0e0e6),
("purple", 0x800080),
("rebeccapurple", 0x663399),
("red", 0xff0000),
("rosybrown", 0xbc8f8f),
("royalblue", 0x4169e1),
("saddlebrown", 0x8b4513),
("salmon", 0xfa8072),
("sandybrown", 0xf4a460),
("seagreen", 0x2e8b57),
("seashell", 0xfff5ee),
("sienna", 0xa0522d),
("silver", 0xc0c0c0),
("skyblue", 0x87ceeb),
("slateblue", 0x6a5acd),
("slategray", 0x708090),
("slategrey", 0x708090),
("snow", 0xfffafa),
("springgreen", 0x00ff7f),
("steelblue", 0x4682b4),
("tan", 0xd2b48c),
("teal", 0x008080),
("thistle", 0xd8bfd8),
("tomato", 0xff6347),
("turquoise", 0x40e0d0),
("violet", 0xee82ee),
("wheat", 0xf5deb3),
("white", 0xffffff),
("whitesmoke", 0xf5f5f5),
("yellow", 0xffff00),
("yellowgreen", 0x9acd32),
]);
}