rat_theme2/scheme.rs
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use ratatui::style::{Color, Style};
/// Color scheme.
///
/// This provides the palette used for a theme.
///
/// The ideas packed in here are
/// * provide two colors for highlighting and accents.
/// * I always want some white, black and gray.
/// * I don't want to miss out anything, so go once
/// round the hue in HSV. Take steps of 30° then we
/// hit pretty much anything interesting.
/// * Just one variant of each color is not enough, make it 4.
/// * Background colors need extra considerations. Extend to 8.
///
#[derive(Debug, Default, Clone)]
pub struct Scheme {
pub white: [Color; 8],
pub black: [Color; 8],
pub gray: [Color; 8],
pub red: [Color; 8],
pub orange: [Color; 8],
pub yellow: [Color; 8],
pub limegreen: [Color; 8],
pub green: [Color; 8],
pub bluegreen: [Color; 8],
pub cyan: [Color; 8],
pub blue: [Color; 8],
pub deepblue: [Color; 8],
pub purple: [Color; 8],
pub magenta: [Color; 8],
pub redpink: [Color; 8],
pub primary: [Color; 8],
pub secondary: [Color; 8],
}
/// Contrast rating for the text-color that should be used.
pub enum TextColorRating {
/// Use light/white text for the given background.
Light,
/// Use dark/black text for the given background.
Dark,
}
/// Used to create a high constrast or normal contrast style.
pub enum Contrast {
High,
Normal,
}
impl Scheme {
pub const BRIGHT_0: usize = 0;
pub const BRIGHT_1: usize = 1;
pub const BRIGHT_2: usize = 2;
pub const BRIGHT_3: usize = 3;
pub const DARK_0: usize = 4;
pub const DARK_1: usize = 5;
pub const DARK_2: usize = 6;
pub const DARK_3: usize = 7;
/// Create a style from the given white shade.
/// n is `0..=3`
pub fn white(&self, n: usize, contrast: Contrast) -> Style {
self.style(self.white[n], contrast)
}
/// Create a style from the given black shade.
/// n is `0..=3`
pub fn black(&self, n: usize, contrast: Contrast) -> Style {
self.style(self.black[n], contrast)
}
/// Create a style from the given gray shade.
/// n is `0..=3`
pub fn gray(&self, n: usize, contrast: Contrast) -> Style {
self.style(self.gray[n], contrast)
}
/// Create a style from the given red shade.
/// n is `0..=3`
pub fn red(&self, n: usize, contrast: Contrast) -> Style {
self.style(self.red[n], contrast)
}
/// Create a style from the given orange shade.
/// n is `0..=3`
pub fn orange(&self, n: usize, contrast: Contrast) -> Style {
self.style(self.orange[n], contrast)
}
/// Create a style from the given yellow shade.
/// n is `0..=3`
pub fn yellow(&self, n: usize, contrast: Contrast) -> Style {
self.style(self.yellow[n], contrast)
}
/// Create a style from the given limegreen shade.
/// n is `0..=3`
pub fn limegreen(&self, n: usize, contrast: Contrast) -> Style {
self.style(self.limegreen[n], contrast)
}
/// Create a style from the given green shade.
/// n is `0..=3`
pub fn green(&self, n: usize, contrast: Contrast) -> Style {
self.style(self.green[n], contrast)
}
/// Create a style from the given bluegreen shade.
/// n is `0..=3`
pub fn bluegreen(&self, n: usize, contrast: Contrast) -> Style {
self.style(self.bluegreen[n], contrast)
}
/// Create a style from the given cyan shade.
/// n is `0..=3`
pub fn cyan(&self, n: usize, contrast: Contrast) -> Style {
self.style(self.cyan[n], contrast)
}
/// Create a style from the given blue shade.
/// n is `0..=3`
pub fn blue(&self, n: usize, contrast: Contrast) -> Style {
self.style(self.blue[n], contrast)
}
/// Create a style from the given deepblue shade.
/// n is `0..=3`
pub fn deepblue(&self, n: usize, contrast: Contrast) -> Style {
self.style(self.deepblue[n], contrast)
}
/// Create a style from the given purple shade.
/// n is `0..=3`
pub fn purple(&self, n: usize, contrast: Contrast) -> Style {
self.style(self.purple[n], contrast)
}
/// Create a style from the given magenta shade.
/// n is `0..=3`
pub fn magenta(&self, n: usize, contrast: Contrast) -> Style {
self.style(self.magenta[n], contrast)
}
/// Create a style from the given redpink shade.
/// n is `0..=3`
pub fn redpink(&self, n: usize, contrast: Contrast) -> Style {
self.style(self.redpink[n], contrast)
}
/// Create a style from the given primary shade.
/// n is `0..=3`
pub fn primary(&self, n: usize, contrast: Contrast) -> Style {
self.style(self.primary[n], contrast)
}
/// Create a style from the given secondary shade.
/// n is `0..=3`
pub fn secondary(&self, n: usize, contrast: Contrast) -> Style {
self.style(self.secondary[n], contrast)
}
}
impl Scheme {
/// Create a style with the given background color and
/// contrast.
pub fn style(&self, color: Color, contrast: Contrast) -> Style {
match contrast {
Contrast::High => self.high_contrast(color),
Contrast::Normal => self.normal_contrast(color),
}
}
/// Create a style with the given background color.
/// Uses `white[3]` or `black[0]` for the foreground,
/// dependent on `rat_text_color`.
pub fn high_contrast(&self, color: Color) -> Style {
match Self::rate_text_color(color) {
None => Style::reset(),
Some(TextColorRating::Light) => Style::new().bg(color).fg(self.white[3]),
Some(TextColorRating::Dark) => Style::new().bg(color).fg(self.black[0]),
}
}
/// Create a style with the given background color.
/// Uses `white[0]` or `black[3]` for the foreground,
/// dependent on `rat_text_color`.
pub fn normal_contrast(&self, color: Color) -> Style {
match Self::rate_text_color(color) {
None => Style::reset(),
Some(TextColorRating::Light) => Style::new().bg(color).fg(self.white[0]),
Some(TextColorRating::Dark) => Style::new().bg(color).fg(self.black[3]),
}
}
/// This gives back a [TextColorRating] for the given background.
///
/// This converts RGB to grayscale and takes the grayscale value
/// of VGA cyan as threshold, which is about 105 out of 255.
/// This point is a bit arbitrary, just based on what I
/// perceive as acceptable. But it produces a good reading
/// contrast in my experience.
///
/// For the named colors it takes the VGA equivalent as a base.
/// For indexed colors it splits the range in half as an estimate.
pub const fn rate_text_color(color: Color) -> Option<TextColorRating> {
match color {
Color::Reset => None,
Color::Black => Some(TextColorRating::Light), //0
Color::Red => Some(TextColorRating::Light), //1
Color::Green => Some(TextColorRating::Light), //2
Color::Yellow => Some(TextColorRating::Light), //3
Color::Blue => Some(TextColorRating::Light), //4
Color::Magenta => Some(TextColorRating::Light), //5
Color::Cyan => Some(TextColorRating::Light), //6
Color::Gray => Some(TextColorRating::Dark), //7
Color::DarkGray => Some(TextColorRating::Light), //8
Color::LightRed => Some(TextColorRating::Dark), //9
Color::LightGreen => Some(TextColorRating::Dark), //10
Color::LightYellow => Some(TextColorRating::Dark), //11
Color::LightBlue => Some(TextColorRating::Light), //12
Color::LightMagenta => Some(TextColorRating::Dark), //13
Color::LightCyan => Some(TextColorRating::Dark), //14
Color::White => Some(TextColorRating::Dark), //15
Color::Rgb(r, g, b) => {
// The formula used in the GIMP is Y = 0.3R + 0.59G + 0.11B;
let grey = r as f32 * 0.3f32 + g as f32 * 0.59f32 + b as f32 * 0.11f32;
if grey >= 105f32 {
Some(TextColorRating::Dark)
} else {
Some(TextColorRating::Light)
}
}
Color::Indexed(n) => match n {
0..=6 => Some(TextColorRating::Light),
7 => Some(TextColorRating::Dark),
8 => Some(TextColorRating::Light),
9..=11 => Some(TextColorRating::Dark),
12 => Some(TextColorRating::Light),
13..=15 => Some(TextColorRating::Dark),
v @ 16..=231 => {
if (v - 16) % 36 < 18 {
Some(TextColorRating::Light)
} else {
Some(TextColorRating::Dark)
}
}
v @ 232..=255 => {
if (v - 232) % 24 < 12 {
Some(TextColorRating::Light)
} else {
Some(TextColorRating::Dark)
}
}
},
}
}
/// Reduces the range of the given color from 0..255
/// to 0..scale_to.
///
/// This gives a true dark equivalent which can be used
/// as a background for a dark theme.
pub const fn darken(color: Color, scale_to: u8) -> Color {
let (r, g, b) = Self::color2rgb(color);
Color::Rgb(
Self::scale_to(r, scale_to),
Self::scale_to(g, scale_to),
Self::scale_to(b, scale_to),
)
}
/// Converts the given color to an equivalent grayscale.
pub const fn grayscale(color: Color) -> Color {
let (r, g, b) = Self::color2rgb(color);
// The formula used in the GIMP is Y = 0.3R + 0.59G + 0.11B;
let gray = r as f32 * 0.3f32 + g as f32 * 0.59f32 + b as f32 * 0.11f32;
Color::Rgb(gray as u8, gray as u8, gray as u8)
}
/// Calculates a linear interpolation for the two colors
/// and fills the first 4 colors.
///
///
pub const fn interpolate(c0: u32, c1: u32, dark_scale_to: u8) -> [Color; 8] {
// 1/3
const fn i1(a: u8, b: u8) -> u8 {
if a < b {
a + (b - a) / 3
} else {
a - (a - b) / 3
}
}
// 2/3
const fn i2(a: u8, b: u8) -> u8 {
if a < b {
b - (b - a) / 3
} else {
b + (a - b) / 3
}
}
let r0 = (c0 >> 16) as u8;
let g0 = (c0 >> 8) as u8;
let b0 = c0 as u8;
let r3 = (c1 >> 16) as u8;
let g3 = (c1 >> 8) as u8;
let b3 = c1 as u8;
let r1 = i1(r0, r3);
let g1 = i1(g0, g3);
let b1 = i1(b0, b3);
let r2 = i2(r0, r3);
let g2 = i2(g0, g3);
let b2 = i2(b0, b3);
// dark
let r4 = Self::scale_to(r0, dark_scale_to);
let g4 = Self::scale_to(g0, dark_scale_to);
let b4 = Self::scale_to(b0, dark_scale_to);
let r5 = Self::scale_to(r1, dark_scale_to);
let g5 = Self::scale_to(g1, dark_scale_to);
let b5 = Self::scale_to(b1, dark_scale_to);
let r6 = Self::scale_to(r2, dark_scale_to);
let g6 = Self::scale_to(g2, dark_scale_to);
let b6 = Self::scale_to(b2, dark_scale_to);
let r7 = Self::scale_to(r3, dark_scale_to);
let g7 = Self::scale_to(g3, dark_scale_to);
let b7 = Self::scale_to(b3, dark_scale_to);
[
Color::Rgb(r0, g0, b0),
Color::Rgb(r1, g1, b1),
Color::Rgb(r2, g2, b2),
Color::Rgb(r3, g3, b3),
Color::Rgb(r4, g4, b4),
Color::Rgb(r5, g5, b5),
Color::Rgb(r6, g6, b6),
Color::Rgb(r7, g7, b7),
]
}
const fn scale_to(v: u8, scale_to: u8) -> u8 {
(((v as u16) * scale_to as u16) / 255u16) as u8
}
const fn color2rgb(color: Color) -> (u8, u8, u8) {
match color {
Color::Black => (0x00, 0x00, 0x00),
Color::Red => (0xaa, 0x00, 0x00),
Color::Green => (0x00, 0xaa, 0x00),
Color::Yellow => (0xaa, 0x55, 0x00),
Color::Blue => (0x00, 0x00, 0xaa),
Color::Magenta => (0xaa, 0x00, 0xaa),
Color::Cyan => (0x00, 0xaa, 0xaa),
Color::Gray => (0xaa, 0xaa, 0xaa),
Color::DarkGray => (0x55, 0x55, 0x55),
Color::LightRed => (0xff, 0x55, 0x55),
Color::LightGreen => (0x55, 0xff, 0x55),
Color::LightYellow => (0xff, 0xff, 0x55),
Color::LightBlue => (0x55, 0x55, 0xff),
Color::LightMagenta => (0xff, 0x55, 0xff),
Color::LightCyan => (0x55, 0xff, 0xff),
Color::White => (0xff, 0xff, 0xff),
Color::Rgb(r, g, b) => (r, g, b),
Color::Indexed(i) => {
const VGA256: [(u8, u8, u8); 256] = [
(0x00, 0x00, 0x00),
(0x80, 0x00, 0x00),
(0x00, 0x80, 0x00),
(0x80, 0x80, 0x00),
(0x00, 0x00, 0x80),
(0x80, 0x00, 0x80),
(0x00, 0x80, 0x80),
(0xc0, 0xc0, 0xc0),
(0x80, 0x80, 0x80),
(0xff, 0x00, 0x00),
(0x00, 0xff, 0x00),
(0xff, 0xff, 0x00),
(0x00, 0x00, 0xff),
(0xff, 0x00, 0xff),
(0x00, 0xff, 0xff),
(0xff, 0xff, 0xff),
(0x00, 0x00, 0x00),
(0x00, 0x00, 0x5f),
(0x00, 0x00, 0x87),
(0x00, 0x00, 0xaf),
(0x00, 0x00, 0xd7),
(0x00, 0x00, 0xff),
(0x00, 0x5f, 0x00),
(0x00, 0x5f, 0x5f),
(0x00, 0x5f, 0x87),
(0x00, 0x5f, 0xaf),
(0x00, 0x5f, 0xd7),
(0x00, 0x5f, 0xff),
(0x00, 0x87, 0x00),
(0x00, 0x87, 0x5f),
(0x00, 0x87, 0x87),
(0x00, 0x87, 0xaf),
(0x00, 0x87, 0xd7),
(0x00, 0x87, 0xff),
(0x00, 0xaf, 0x00),
(0x00, 0xaf, 0x5f),
(0x00, 0xaf, 0x87),
(0x00, 0xaf, 0xaf),
(0x00, 0xaf, 0xd7),
(0x00, 0xaf, 0xff),
(0x00, 0xd7, 0x00),
(0x00, 0xd7, 0x5f),
(0x00, 0xd7, 0x87),
(0x00, 0xd7, 0xaf),
(0x00, 0xd7, 0xd7),
(0x00, 0xd7, 0xff),
(0x00, 0xff, 0x00),
(0x00, 0xff, 0x5f),
(0x00, 0xff, 0x87),
(0x00, 0xff, 0xaf),
(0x00, 0xff, 0xd7),
(0x00, 0xff, 0xff),
(0x5f, 0x00, 0x00),
(0x5f, 0x00, 0x5f),
(0x5f, 0x00, 0x87),
(0x5f, 0x00, 0xaf),
(0x5f, 0x00, 0xd7),
(0x5f, 0x00, 0xff),
(0x5f, 0x5f, 0x00),
(0x5f, 0x5f, 0x5f),
(0x5f, 0x5f, 0x87),
(0x5f, 0x5f, 0xaf),
(0x5f, 0x5f, 0xd7),
(0x5f, 0x5f, 0xff),
(0x5f, 0x87, 0x00),
(0x5f, 0x87, 0x5f),
(0x5f, 0x87, 0x87),
(0x5f, 0x87, 0xaf),
(0x5f, 0x87, 0xd7),
(0x5f, 0x87, 0xff),
(0x5f, 0xaf, 0x00),
(0x5f, 0xaf, 0x5f),
(0x5f, 0xaf, 0x87),
(0x5f, 0xaf, 0xaf),
(0x5f, 0xaf, 0xd7),
(0x5f, 0xaf, 0xff),
(0x5f, 0xd7, 0x00),
(0x5f, 0xd7, 0x5f),
(0x5f, 0xd7, 0x87),
(0x5f, 0xd7, 0xaf),
(0x5f, 0xd7, 0xd7),
(0x5f, 0xd7, 0xff),
(0x5f, 0xff, 0x00),
(0x5f, 0xff, 0x5f),
(0x5f, 0xff, 0x87),
(0x5f, 0xff, 0xaf),
(0x5f, 0xff, 0xd7),
(0x5f, 0xff, 0xff),
(0x87, 0x00, 0x00),
(0x87, 0x00, 0x5f),
(0x87, 0x00, 0x87),
(0x87, 0x00, 0xaf),
(0x87, 0x00, 0xd7),
(0x87, 0x00, 0xff),
(0x87, 0x5f, 0x00),
(0x87, 0x5f, 0x5f),
(0x87, 0x5f, 0x87),
(0x87, 0x5f, 0xaf),
(0x87, 0x5f, 0xd7),
(0x87, 0x5f, 0xff),
(0x87, 0x87, 0x00),
(0x87, 0x87, 0x5f),
(0x87, 0x87, 0x87),
(0x87, 0x87, 0xaf),
(0x87, 0x87, 0xd7),
(0x87, 0x87, 0xff),
(0x87, 0xaf, 0x00),
(0x87, 0xaf, 0x5f),
(0x87, 0xaf, 0x87),
(0x87, 0xaf, 0xaf),
(0x87, 0xaf, 0xd7),
(0x87, 0xaf, 0xff),
(0x87, 0xd7, 0x00),
(0x87, 0xd7, 0x5f),
(0x87, 0xd7, 0x87),
(0x87, 0xd7, 0xaf),
(0x87, 0xd7, 0xd7),
(0x87, 0xd7, 0xff),
(0x87, 0xff, 0x00),
(0x87, 0xff, 0x5f),
(0x87, 0xff, 0x87),
(0x87, 0xff, 0xaf),
(0x87, 0xff, 0xd7),
(0x87, 0xff, 0xff),
(0xaf, 0x00, 0x00),
(0xaf, 0x00, 0x5f),
(0xaf, 0x00, 0x87),
(0xaf, 0x00, 0xaf),
(0xaf, 0x00, 0xd7),
(0xaf, 0x00, 0xff),
(0xaf, 0x5f, 0x00),
(0xaf, 0x5f, 0x5f),
(0xaf, 0x5f, 0x87),
(0xaf, 0x5f, 0xaf),
(0xaf, 0x5f, 0xd7),
(0xaf, 0x5f, 0xff),
(0xaf, 0x87, 0x00),
(0xaf, 0x87, 0x5f),
(0xaf, 0x87, 0x87),
(0xaf, 0x87, 0xaf),
(0xaf, 0x87, 0xd7),
(0xaf, 0x87, 0xff),
(0xaf, 0xaf, 0x00),
(0xaf, 0xaf, 0x5f),
(0xaf, 0xaf, 0x87),
(0xaf, 0xaf, 0xaf),
(0xaf, 0xaf, 0xd7),
(0xaf, 0xaf, 0xff),
(0xaf, 0xd7, 0x00),
(0xaf, 0xd7, 0x5f),
(0xaf, 0xd7, 0x87),
(0xaf, 0xd7, 0xaf),
(0xaf, 0xd7, 0xd7),
(0xaf, 0xd7, 0xff),
(0xaf, 0xff, 0x00),
(0xaf, 0xff, 0x5f),
(0xaf, 0xff, 0x87),
(0xaf, 0xff, 0xaf),
(0xaf, 0xff, 0xd7),
(0xaf, 0xff, 0xff),
(0xd7, 0x00, 0x00),
(0xd7, 0x00, 0x5f),
(0xd7, 0x00, 0x87),
(0xd7, 0x00, 0xaf),
(0xd7, 0x00, 0xd7),
(0xd7, 0x00, 0xff),
(0xd7, 0x5f, 0x00),
(0xd7, 0x5f, 0x5f),
(0xd7, 0x5f, 0x87),
(0xd7, 0x5f, 0xaf),
(0xd7, 0x5f, 0xd7),
(0xd7, 0x5f, 0xff),
(0xd7, 0x87, 0x00),
(0xd7, 0x87, 0x5f),
(0xd7, 0x87, 0x87),
(0xd7, 0x87, 0xaf),
(0xd7, 0x87, 0xd7),
(0xd7, 0x87, 0xff),
(0xd7, 0xaf, 0x00),
(0xd7, 0xaf, 0x5f),
(0xd7, 0xaf, 0x87),
(0xd7, 0xaf, 0xaf),
(0xd7, 0xaf, 0xd7),
(0xd7, 0xaf, 0xff),
(0xd7, 0xd7, 0x00),
(0xd7, 0xd7, 0x5f),
(0xd7, 0xd7, 0x87),
(0xd7, 0xd7, 0xaf),
(0xd7, 0xd7, 0xd7),
(0xd7, 0xd7, 0xff),
(0xd7, 0xff, 0x00),
(0xd7, 0xff, 0x5f),
(0xd7, 0xff, 0x87),
(0xd7, 0xff, 0xaf),
(0xd7, 0xff, 0xd7),
(0xd7, 0xff, 0xff),
(0xff, 0x00, 0x00),
(0xff, 0x00, 0x5f),
(0xff, 0x00, 0x87),
(0xff, 0x00, 0xaf),
(0xff, 0x00, 0xd7),
(0xff, 0x00, 0xff),
(0xff, 0x5f, 0x00),
(0xff, 0x5f, 0x5f),
(0xff, 0x5f, 0x87),
(0xff, 0x5f, 0xaf),
(0xff, 0x5f, 0xd7),
(0xff, 0x5f, 0xff),
(0xff, 0x87, 0x00),
(0xff, 0x87, 0x5f),
(0xff, 0x87, 0x87),
(0xff, 0x87, 0xaf),
(0xff, 0x87, 0xd7),
(0xff, 0x87, 0xff),
(0xff, 0xaf, 0x00),
(0xff, 0xaf, 0x5f),
(0xff, 0xaf, 0x87),
(0xff, 0xaf, 0xaf),
(0xff, 0xaf, 0xd7),
(0xff, 0xaf, 0xff),
(0xff, 0xd7, 0x00),
(0xff, 0xd7, 0x5f),
(0xff, 0xd7, 0x87),
(0xff, 0xd7, 0xaf),
(0xff, 0xd7, 0xd7),
(0xff, 0xd7, 0xff),
(0xff, 0xff, 0x00),
(0xff, 0xff, 0x5f),
(0xff, 0xff, 0x87),
(0xff, 0xff, 0xaf),
(0xff, 0xff, 0xd7),
(0xff, 0xff, 0xff),
(0x08, 0x08, 0x08),
(0x12, 0x12, 0x12),
(0x1c, 0x1c, 0x1c),
(0x26, 0x26, 0x26),
(0x30, 0x30, 0x30),
(0x3a, 0x3a, 0x3a),
(0x44, 0x44, 0x44),
(0x4e, 0x4e, 0x4e),
(0x58, 0x58, 0x58),
(0x62, 0x62, 0x62),
(0x6c, 0x6c, 0x6c),
(0x76, 0x76, 0x76),
(0x80, 0x80, 0x80),
(0x8a, 0x8a, 0x8a),
(0x94, 0x94, 0x94),
(0x9e, 0x9e, 0x9e),
(0xa8, 0xa8, 0xa8),
(0xb2, 0xb2, 0xb2),
(0xbc, 0xbc, 0xbc),
(0xc6, 0xc6, 0xc6),
(0xd0, 0xd0, 0xd0),
(0xda, 0xda, 0xda),
(0xe4, 0xe4, 0xe4),
(0xee, 0xee, 0xee),
];
VGA256[i as usize]
}
Color::Reset => (0, 0, 0),
}
}
}