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use proportion::*;
#[derive(Copy, Clone, Default, PartialEq, Eq, Hash)]
pub struct Colour {
/// Colour encoded as `0xAARRGGBB`.
pub value: u32,
}
impl Colour {
/// Construct a Colour from an RGB u32.
pub const fn rgb(value: u32) -> Self {
Self {
value: value | 0xff000000,
}
}
/// Construct a Colour from an RGBA u32.
pub const fn rgba(value: u32) -> Self {
Self { value }
}
/// Construct a Colour from a brightness value.
pub const fn grey(value: u32) -> Self {
Self::rgb((value & 0xf) * 0x111111)
}
/// Construct a Colour from separate red, green, and blue channel values.
pub const fn from_rgb(red: u8, green: u8, blue: u8) -> Self {
let mut value = 0x0000ff00;
value |= red as u32;
value <<= 8; value |= green as u32;
value <<= 8; value |= blue as u32;
Self { value }
}
/// Construct a Colour from separate red, green, blue, and alpha channel values.
pub const fn from_rgba(red: u8, green: u8, blue: u8, alpha: u8) -> Self {
let mut value = alpha as u32;
value <<= 8; value |= red as u32;
value <<= 8; value |= green as u32;
value <<= 8; value |= blue as u32;
Self { value }
}
/// Construct a colour by blending two colours by a proportion.
pub fn mix<I: proportion::Internal>(bg: Self, fg: Self, proportion: Proportion<I>) -> Self {
let proportion = Proportion::<u8>::new(proportion.as_u8());
let bg_mix = proportion.invert();
let fg_mix = proportion;
let red = (bg.red() * bg_mix) + (fg.red() * fg_mix);
let green = (bg.green() * bg_mix) + (fg.green() * fg_mix);
let blue = (bg.blue() * bg_mix) + (fg.blue() * fg_mix);
Self::from_rgb(red, green, blue)
}
/// Construct a colour by blending two colours by the alpha of the fg colour.
pub fn mix_with_alpha(bg: Self, fg: Self) -> Self {
let proportion = Proportion::new(fg.alpha());
let bg_mix = proportion.invert();
let fg_mix = proportion;
let red = (bg.red() * bg_mix) + (fg.red() * fg_mix);
let green = (bg.green() * bg_mix) + (fg.green() * fg_mix);
let blue = (bg.blue() * bg_mix) + (fg.blue() * fg_mix);
Self::from_rgb(red, green, blue)
}
/// Get an array of red, green, and blue channel values.
pub fn as_rgb_array(&self) -> [u8; 3] {
[self.red(), self.green(), self.blue()]
}
/// Get an array of red, green, blue, and alpha channel values.
pub fn as_rgba_array(&self) -> [u8; 4] {
[self.red(), self.green(), self.blue(), self.alpha()]
}
pub fn as_rgb_hex(&self) -> String {
format!("{:02x}{:02x}{:02x}",
self.red(), self.green(), self.blue())
}
pub fn as_rgba_hex(&self) -> String {
format!("{:02x}{:02x}{:02x}{:02x}",
self.red(), self.green(), self.blue(), self.alpha())
}
pub fn red(&self) -> u8 {
(self.value >> 16) as u8
}
pub fn green(&self) -> u8 {
(self.value >> 8) as u8
}
pub fn blue(&self) -> u8 {
self.value as u8
}
pub fn alpha(&self) -> u8 {
(self.value >> 24) as u8
}
pub fn is_opaque(&self) -> bool {
self.alpha() == 0xff
}
pub fn with_red(&self, red: u8) -> Self {
Colour::rgba((self.value & 0xffffff00) | (red as u32) << 16)
}
pub fn with_green(&self, green: u8) -> Self {
Colour::rgba((self.value & 0xffff00ff) | (green as u32) << 8)
}
pub fn with_blue(&self, blue: u8) -> Self {
Colour::rgba((self.value & 0xff00ffff) | blue as u32)
}
pub fn with_alpha(&self, alpha: u8) -> Self {
Colour::rgba((self.value & 0x00ffffff) | (alpha as u32) << 24)
}
pub fn set_red(&mut self, red: u8) {
self.value = (self.value & 0xffffff00) | (red as u32) << 16
}
pub fn set_green(&mut self, green: u8) {
self.value = (self.value & 0xffff00ff) | (green as u32) << 8
}
pub fn set_blue(&mut self, blue: u8) {
self.value = (self.value & 0xff00ffff) | blue as u32
}
pub fn set_alpha(&mut self, alpha: u8) {
self.value = (self.value & 0x00ffffff) | (alpha as u32) << 24
}
}
impl Colour {
pub const TRANSPARENT: Self = Self::rgba(0x00000000);
pub const WHITE: Self = Self::rgb(0xffffff);
pub const BLACK: Self = Self::rgb(0x000000);
pub const LIGHT_GREY: Self = Self::rgb(0xc0c0c0);
pub const MID_GREY: Self = Self::rgb(0x808080);
pub const DARK_GREY: Self = Self::rgb(0x404040);
pub const RED: Self = Self::rgb(0xff0000);
pub const GREEN: Self = Self::rgb(0x00ff00);
pub const BLUE: Self = Self::rgb(0x0000ff);
pub const YELLOW: Self = Self::rgb(0xffff00);
pub const MAGENTA: Self = Self::rgb(0xff00ff);
pub const CYAN: Self = Self::rgb(0x00ffff);
pub const ORANGE: Self = Self::rgb(0xff8000);
pub const PURPLE: Self = Self::rgb(0x800080);
pub const TEAL: Self = Self::rgb(0x008080);
}
impl From<u32> for Colour {
fn from(value: u32) -> Self {
Colour { value }
}
}
impl From<Colour> for u32 {
fn from(colour: Colour) -> Self {
colour.value
}
}
impl AsRef<u32> for Colour {
fn as_ref(&self) -> &u32 {
&self.value
}
}
impl std::fmt::Debug for Colour {
fn fmt(&self, f: &mut std::fmt::Formatter) -> Result<(), std::fmt::Error> {
write!(f,
"Colour {{ r:{} g:{} b:{}, a:{} }}",
self.red(),
self.green(),
self.blue(),
self.alpha()
)
}
}
impl std::fmt::Display for Colour {
fn fmt(&self, f: &mut std::fmt::Formatter) -> Result<(), std::fmt::Error> {
write!(f,
"#{:02x}{:02x}{:02x}{:02x}",
self.red(),
self.green(),
self.blue(),
self.alpha()
)
}
}
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