counter-color/lib/rgb.js

Helps to determine what color of text goes best for a given background, light or dark (and vice versa).

export const sRGB = (rgb) => {
    const normalized = rgb.map(channel => channel / 255);
    const srgb = normalized.map(channel => channel <= 0.039_28 ? channel / 12.92 : ((channel + 0.055) / 1.055) ** 2.4);
    return srgb;
};
export function hexToRGB(hex) {
    if (hex.startsWith("#"))
        hex = hex.substring(1);
    const toDec = (hex) => parseInt(hex, 16);
    return hex.length == 3
        ? [toDec(hex[0] + hex[0]), toDec(hex[1] + hex[1]), toDec(hex[2] + hex[2])]
        : [toDec(hex[0] + hex[1]), toDec(hex[2] + hex[3]), toDec(hex[4] + hex[5])];
}
export function decToRGB(dec) {
    return [(dec >> 16) & 0xff, (dec >> 8) & 0xff, dec & 0xff];
}
export function toRGB(color) {
    if (typeof color === "string")
        return hexToRGB(color);
    else if (typeof color === "number")
        return decToRGB(color);
    else if (Array.isArray(color))
        return color;
    throw new Error(`Bad color value: ${typeof color} = ${color}`);
}
export function rgbToHex(rgb) {
    return `#` + rgb.map(_ => _.toString(16).padStart(2, "0")).join("");
}
export function decToHex(dec) {
    return rgbToHex(decToRGB(dec));
}
export function hexToDec(hex) {
    if (hex.startsWith("#"))
        hex = hex.substring(1);
    return parseInt(hex, 16);
}
export function rbgToDec(rgb) {
    return hexToDec(rgbToHex(rgb));
}
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