/* MIT license */
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/* eslint-disable no-mixed-operators */
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const cssKeywords = require('color-name');
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// NOTE: conversions should only return primitive values (i.e. arrays, or
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// values that give correct `typeof` results).
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// do not use box values types (i.e. Number(), String(), etc.)
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const reverseKeywords = {};
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for (const key of Object.keys(cssKeywords)) {
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reverseKeywords[cssKeywords[key]] = key;
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}
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const convert = {
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rgb: {channels: 3, labels: 'rgb'},
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hsl: {channels: 3, labels: 'hsl'},
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hsv: {channels: 3, labels: 'hsv'},
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hwb: {channels: 3, labels: 'hwb'},
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cmyk: {channels: 4, labels: 'cmyk'},
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xyz: {channels: 3, labels: 'xyz'},
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lab: {channels: 3, labels: 'lab'},
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lch: {channels: 3, labels: 'lch'},
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hex: {channels: 1, labels: ['hex']},
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keyword: {channels: 1, labels: ['keyword']},
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ansi16: {channels: 1, labels: ['ansi16']},
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ansi256: {channels: 1, labels: ['ansi256']},
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hcg: {channels: 3, labels: ['h', 'c', 'g']},
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apple: {channels: 3, labels: ['r16', 'g16', 'b16']},
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gray: {channels: 1, labels: ['gray']}
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};
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module.exports = convert;
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// Hide .channels and .labels properties
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for (const model of Object.keys(convert)) {
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if (!('channels' in convert[model])) {
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throw new Error('missing channels property: ' + model);
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}
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if (!('labels' in convert[model])) {
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throw new Error('missing channel labels property: ' + model);
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}
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if (convert[model].labels.length !== convert[model].channels) {
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throw new Error('channel and label counts mismatch: ' + model);
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}
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const {channels, labels} = convert[model];
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delete convert[model].channels;
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delete convert[model].labels;
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Object.defineProperty(convert[model], 'channels', {value: channels});
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Object.defineProperty(convert[model], 'labels', {value: labels});
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}
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convert.rgb.hsl = function (rgb) {
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const r = rgb[0] / 255;
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const g = rgb[1] / 255;
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const b = rgb[2] / 255;
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const min = Math.min(r, g, b);
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const max = Math.max(r, g, b);
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const delta = max - min;
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let h;
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let s;
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if (max === min) {
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h = 0;
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} else if (r === max) {
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h = (g - b) / delta;
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} else if (g === max) {
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h = 2 + (b - r) / delta;
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} else if (b === max) {
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h = 4 + (r - g) / delta;
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}
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h = Math.min(h * 60, 360);
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if (h < 0) {
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h += 360;
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}
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const l = (min + max) / 2;
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if (max === min) {
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s = 0;
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} else if (l <= 0.5) {
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s = delta / (max + min);
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} else {
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s = delta / (2 - max - min);
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}
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return [h, s * 100, l * 100];
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};
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convert.rgb.hsv = function (rgb) {
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let rdif;
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let gdif;
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let bdif;
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let h;
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let s;
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const r = rgb[0] / 255;
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const g = rgb[1] / 255;
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const b = rgb[2] / 255;
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const v = Math.max(r, g, b);
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const diff = v - Math.min(r, g, b);
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const diffc = function (c) {
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return (v - c) / 6 / diff + 1 / 2;
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};
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if (diff === 0) {
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h = 0;
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s = 0;
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} else {
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s = diff / v;
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rdif = diffc(r);
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gdif = diffc(g);
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bdif = diffc(b);
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if (r === v) {
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h = bdif - gdif;
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} else if (g === v) {
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h = (1 / 3) + rdif - bdif;
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} else if (b === v) {
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h = (2 / 3) + gdif - rdif;
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}
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if (h < 0) {
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h += 1;
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} else if (h > 1) {
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h -= 1;
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}
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}
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return [
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h * 360,
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s * 100,
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v * 100
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];
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};
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convert.rgb.hwb = function (rgb) {
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const r = rgb[0];
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const g = rgb[1];
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let b = rgb[2];
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const h = convert.rgb.hsl(rgb)[0];
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const w = 1 / 255 * Math.min(r, Math.min(g, b));
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b = 1 - 1 / 255 * Math.max(r, Math.max(g, b));
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return [h, w * 100, b * 100];
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};
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convert.rgb.cmyk = function (rgb) {
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const r = rgb[0] / 255;
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const g = rgb[1] / 255;
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const b = rgb[2] / 255;
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const k = Math.min(1 - r, 1 - g, 1 - b);
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const c = (1 - r - k) / (1 - k) || 0;
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const m = (1 - g - k) / (1 - k) || 0;
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const y = (1 - b - k) / (1 - k) || 0;
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return [c * 100, m * 100, y * 100, k * 100];
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};
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function comparativeDistance(x, y) {
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/*
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See https://en.m.wikipedia.org/wiki/Euclidean_distance#Squared_Euclidean_distance
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*/
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return (
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((x[0] - y[0]) ** 2) +
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((x[1] - y[1]) ** 2) +
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((x[2] - y[2]) ** 2)
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);
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}
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convert.rgb.keyword = function (rgb) {
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const reversed = reverseKeywords[rgb];
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if (reversed) {
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return reversed;
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}
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let currentClosestDistance = Infinity;
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let currentClosestKeyword;
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for (const keyword of Object.keys(cssKeywords)) {
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const value = cssKeywords[keyword];
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// Compute comparative distance
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const distance = comparativeDistance(rgb, value);
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// Check if its less, if so set as closest
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if (distance < currentClosestDistance) {
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currentClosestDistance = distance;
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currentClosestKeyword = keyword;
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}
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}
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return currentClosestKeyword;
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};
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convert.keyword.rgb = function (keyword) {
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return cssKeywords[keyword];
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};
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convert.rgb.xyz = function (rgb) {
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let r = rgb[0] / 255;
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let g = rgb[1] / 255;
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let b = rgb[2] / 255;
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// Assume sRGB
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r = r > 0.04045 ? (((r + 0.055) / 1.055) ** 2.4) : (r / 12.92);
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g = g > 0.04045 ? (((g + 0.055) / 1.055) ** 2.4) : (g / 12.92);
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b = b > 0.04045 ? (((b + 0.055) / 1.055) ** 2.4) : (b / 12.92);
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const x = (r * 0.4124) + (g * 0.3576) + (b * 0.1805);
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const y = (r * 0.2126) + (g * 0.7152) + (b * 0.0722);
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const z = (r * 0.0193) + (g * 0.1192) + (b * 0.9505);
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return [x * 100, y * 100, z * 100];
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};
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convert.rgb.lab = function (rgb) {
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const xyz = convert.rgb.xyz(rgb);
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let x = xyz[0];
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let y = xyz[1];
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let z = xyz[2];
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x /= 95.047;
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y /= 100;
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z /= 108.883;
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x = x > 0.008856 ? (x ** (1 / 3)) : (7.787 * x) + (16 / 116);
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y = y > 0.008856 ? (y ** (1 / 3)) : (7.787 * y) + (16 / 116);
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z = z > 0.008856 ? (z ** (1 / 3)) : (7.787 * z) + (16 / 116);
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const l = (116 * y) - 16;
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const a = 500 * (x - y);
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const b = 200 * (y - z);
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return [l, a, b];
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};
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convert.hsl.rgb = function (hsl) {
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const h = hsl[0] / 360;
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const s = hsl[1] / 100;
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const l = hsl[2] / 100;
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let t2;
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let t3;
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let val;
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if (s === 0) {
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val = l * 255;
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return [val, val, val];
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}
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if (l < 0.5) {
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t2 = l * (1 + s);
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} else {
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t2 = l + s - l * s;
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}
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const t1 = 2 * l - t2;
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const rgb = [0, 0, 0];
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for (let i = 0; i < 3; i++) {
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t3 = h + 1 / 3 * -(i - 1);
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if (t3 < 0) {
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t3++;
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}
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if (t3 > 1) {
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t3--;
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}
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if (6 * t3 < 1) {
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val = t1 + (t2 - t1) * 6 * t3;
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} else if (2 * t3 < 1) {
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val = t2;
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} else if (3 * t3 < 2) {
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val = t1 + (t2 - t1) * (2 / 3 - t3) * 6;
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} else {
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val = t1;
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}
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rgb[i] = val * 255;
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}
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return rgb;
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};
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convert.hsl.hsv = function (hsl) {
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const h = hsl[0];
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let s = hsl[1] / 100;
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let l = hsl[2] / 100;
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let smin = s;
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const lmin = Math.max(l, 0.01);
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l *= 2;
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s *= (l <= 1) ? l : 2 - l;
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smin *= lmin <= 1 ? lmin : 2 - lmin;
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const v = (l + s) / 2;
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const sv = l === 0 ? (2 * smin) / (lmin + smin) : (2 * s) / (l + s);
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return [h, sv * 100, v * 100];
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};
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convert.hsv.rgb = function (hsv) {
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const h = hsv[0] / 60;
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const s = hsv[1] / 100;
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let v = hsv[2] / 100;
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const hi = Math.floor(h) % 6;
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const f = h - Math.floor(h);
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const p = 255 * v * (1 - s);
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const q = 255 * v * (1 - (s * f));
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const t = 255 * v * (1 - (s * (1 - f)));
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v *= 255;
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switch (hi) {
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case 0:
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return [v, t, p];
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case 1:
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return [q, v, p];
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case 2:
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return [p, v, t];
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case 3:
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return [p, q, v];
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case 4:
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return [t, p, v];
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case 5:
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return [v, p, q];
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}
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};
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convert.hsv.hsl = function (hsv) {
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const h = hsv[0];
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const s = hsv[1] / 100;
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const v = hsv[2] / 100;
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const vmin = Math.max(v, 0.01);
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let sl;
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let l;
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l = (2 - s) * v;
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const lmin = (2 - s) * vmin;
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sl = s * vmin;
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sl /= (lmin <= 1) ? lmin : 2 - lmin;
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sl = sl || 0;
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l /= 2;
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return [h, sl * 100, l * 100];
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};
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// http://dev.w3.org/csswg/css-color/#hwb-to-rgb
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convert.hwb.rgb = function (hwb) {
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const h = hwb[0] / 360;
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let wh = hwb[1] / 100;
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let bl = hwb[2] / 100;
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const ratio = wh + bl;
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let f;
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// Wh + bl cant be > 1
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if (ratio > 1) {
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wh /= ratio;
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bl /= ratio;
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}
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const i = Math.floor(6 * h);
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const v = 1 - bl;
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f = 6 * h - i;
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if ((i & 0x01) !== 0) {
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f = 1 - f;
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}
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const n = wh + f * (v - wh); // Linear interpolation
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let r;
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let g;
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let b;
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/* eslint-disable max-statements-per-line,no-multi-spaces */
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switch (i) {
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default:
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case 6:
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case 0: r = v; g = n; b = wh; break;
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case 1: r = n; g = v; b = wh; break;
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case 2: r = wh; g = v; b = n; break;
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case 3: r = wh; g = n; b = v; break;
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case 4: r = n; g = wh; b = v; break;
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case 5: r = v; g = wh; b = n; break;
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}
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/* eslint-enable max-statements-per-line,no-multi-spaces */
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return [r * 255, g * 255, b * 255];
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};
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convert.cmyk.rgb = function (cmyk) {
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const c = cmyk[0] / 100;
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const m = cmyk[1] / 100;
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const y = cmyk[2] / 100;
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const k = cmyk[3] / 100;
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const r = 1 - Math.min(1, c * (1 - k) + k);
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const g = 1 - Math.min(1, m * (1 - k) + k);
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const b = 1 - Math.min(1, y * (1 - k) + k);
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return [r * 255, g * 255, b * 255];
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};
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convert.xyz.rgb = function (xyz) {
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const x = xyz[0] / 100;
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const y = xyz[1] / 100;
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const z = xyz[2] / 100;
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let r;
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let g;
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let b;
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r = (x * 3.2406) + (y * -1.5372) + (z * -0.4986);
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g = (x * -0.9689) + (y * 1.8758) + (z * 0.0415);
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b = (x * 0.0557) + (y * -0.2040) + (z * 1.0570);
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// Assume sRGB
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r = r > 0.0031308
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? ((1.055 * (r ** (1.0 / 2.4))) - 0.055)
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: r * 12.92;
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g = g > 0.0031308
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? ((1.055 * (g ** (1.0 / 2.4))) - 0.055)
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: g * 12.92;
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b = b > 0.0031308
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? ((1.055 * (b ** (1.0 / 2.4))) - 0.055)
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: b * 12.92;
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r = Math.min(Math.max(0, r), 1);
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g = Math.min(Math.max(0, g), 1);
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b = Math.min(Math.max(0, b), 1);
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return [r * 255, g * 255, b * 255];
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};
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convert.xyz.lab = function (xyz) {
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let x = xyz[0];
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let y = xyz[1];
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let z = xyz[2];
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x /= 95.047;
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y /= 100;
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z /= 108.883;
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x = x > 0.008856 ? (x ** (1 / 3)) : (7.787 * x) + (16 / 116);
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y = y > 0.008856 ? (y ** (1 / 3)) : (7.787 * y) + (16 / 116);
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z = z > 0.008856 ? (z ** (1 / 3)) : (7.787 * z) + (16 / 116);
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const l = (116 * y) - 16;
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const a = 500 * (x - y);
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const b = 200 * (y - z);
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return [l, a, b];
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};
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convert.lab.xyz = function (lab) {
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const l = lab[0];
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const a = lab[1];
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const b = lab[2];
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let x;
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let y;
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let z;
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y = (l + 16) / 116;
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x = a / 500 + y;
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z = y - b / 200;
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const y2 = y ** 3;
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const x2 = x ** 3;
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const z2 = z ** 3;
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y = y2 > 0.008856 ? y2 : (y - 16 / 116) / 7.787;
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x = x2 > 0.008856 ? x2 : (x - 16 / 116) / 7.787;
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z = z2 > 0.008856 ? z2 : (z - 16 / 116) / 7.787;
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x *= 95.047;
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y *= 100;
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z *= 108.883;
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return [x, y, z];
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};
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convert.lab.lch = function (lab) {
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const l = lab[0];
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const a = lab[1];
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const b = lab[2];
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let h;
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const hr = Math.atan2(b, a);
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h = hr * 360 / 2 / Math.PI;
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if (h < 0) {
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h += 360;
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}
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const c = Math.sqrt(a * a + b * b);
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return [l, c, h];
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};
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convert.lch.lab = function (lch) {
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const l = lch[0];
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const c = lch[1];
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const h = lch[2];
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const hr = h / 360 * 2 * Math.PI;
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const a = c * Math.cos(hr);
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const b = c * Math.sin(hr);
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return [l, a, b];
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};
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convert.rgb.ansi16 = function (args, saturation = null) {
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const [r, g, b] = args;
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let value = saturation === null ? convert.rgb.hsv(args)[2] : saturation; // Hsv -> ansi16 optimization
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value = Math.round(value / 50);
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if (value === 0) {
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return 30;
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}
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let ansi = 30
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+ ((Math.round(b / 255) << 2)
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| (Math.round(g / 255) << 1)
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| Math.round(r / 255));
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if (value === 2) {
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ansi += 60;
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}
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return ansi;
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};
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convert.hsv.ansi16 = function (args) {
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// Optimization here; we already know the value and don't need to get
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// it converted for us.
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return convert.rgb.ansi16(convert.hsv.rgb(args), args[2]);
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};
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convert.rgb.ansi256 = function (args) {
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const r = args[0];
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const g = args[1];
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const b = args[2];
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// We use the extended greyscale palette here, with the exception of
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// black and white. normal palette only has 4 greyscale shades.
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if (r === g && g === b) {
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if (r < 8) {
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return 16;
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}
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if (r > 248) {
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return 231;
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}
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return Math.round(((r - 8) / 247) * 24) + 232;
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}
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const ansi = 16
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+ (36 * Math.round(r / 255 * 5))
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+ (6 * Math.round(g / 255 * 5))
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+ Math.round(b / 255 * 5);
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return ansi;
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};
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convert.ansi16.rgb = function (args) {
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let color = args % 10;
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// Handle greyscale
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if (color === 0 || color === 7) {
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if (args > 50) {
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color += 3.5;
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}
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color = color / 10.5 * 255;
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return [color, color, color];
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}
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const mult = (~~(args > 50) + 1) * 0.5;
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const r = ((color & 1) * mult) * 255;
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const g = (((color >> 1) & 1) * mult) * 255;
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const b = (((color >> 2) & 1) * mult) * 255;
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return [r, g, b];
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};
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convert.ansi256.rgb = function (args) {
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// Handle greyscale
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if (args >= 232) {
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const c = (args - 232) * 10 + 8;
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return [c, c, c];
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}
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args -= 16;
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let rem;
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const r = Math.floor(args / 36) / 5 * 255;
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const g = Math.floor((rem = args % 36) / 6) / 5 * 255;
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const b = (rem % 6) / 5 * 255;
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return [r, g, b];
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};
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convert.rgb.hex = function (args) {
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const integer = ((Math.round(args[0]) & 0xFF) << 16)
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+ ((Math.round(args[1]) & 0xFF) << 8)
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+ (Math.round(args[2]) & 0xFF);
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const string = integer.toString(16).toUpperCase();
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return '000000'.substring(string.length) + string;
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};
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convert.hex.rgb = function (args) {
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const match = args.toString(16).match(/[a-f0-9]{6}|[a-f0-9]{3}/i);
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if (!match) {
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return [0, 0, 0];
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}
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let colorString = match[0];
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if (match[0].length === 3) {
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colorString = colorString.split('').map(char => {
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return char + char;
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}).join('');
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}
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const integer = parseInt(colorString, 16);
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const r = (integer >> 16) & 0xFF;
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const g = (integer >> 8) & 0xFF;
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const b = integer & 0xFF;
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return [r, g, b];
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};
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convert.rgb.hcg = function (rgb) {
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const r = rgb[0] / 255;
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const g = rgb[1] / 255;
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const b = rgb[2] / 255;
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const max = Math.max(Math.max(r, g), b);
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const min = Math.min(Math.min(r, g), b);
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const chroma = (max - min);
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let grayscale;
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let hue;
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if (chroma < 1) {
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grayscale = min / (1 - chroma);
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} else {
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grayscale = 0;
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}
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if (chroma <= 0) {
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hue = 0;
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} else
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if (max === r) {
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hue = ((g - b) / chroma) % 6;
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} else
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if (max === g) {
|
hue = 2 + (b - r) / chroma;
|
} else {
|
hue = 4 + (r - g) / chroma;
|
}
|
|
hue /= 6;
|
hue %= 1;
|
|
return [hue * 360, chroma * 100, grayscale * 100];
|
};
|
|
convert.hsl.hcg = function (hsl) {
|
const s = hsl[1] / 100;
|
const l = hsl[2] / 100;
|
|
const c = l < 0.5 ? (2.0 * s * l) : (2.0 * s * (1.0 - l));
|
|
let f = 0;
|
if (c < 1.0) {
|
f = (l - 0.5 * c) / (1.0 - c);
|
}
|
|
return [hsl[0], c * 100, f * 100];
|
};
|
|
convert.hsv.hcg = function (hsv) {
|
const s = hsv[1] / 100;
|
const v = hsv[2] / 100;
|
|
const c = s * v;
|
let f = 0;
|
|
if (c < 1.0) {
|
f = (v - c) / (1 - c);
|
}
|
|
return [hsv[0], c * 100, f * 100];
|
};
|
|
convert.hcg.rgb = function (hcg) {
|
const h = hcg[0] / 360;
|
const c = hcg[1] / 100;
|
const g = hcg[2] / 100;
|
|
if (c === 0.0) {
|
return [g * 255, g * 255, g * 255];
|
}
|
|
const pure = [0, 0, 0];
|
const hi = (h % 1) * 6;
|
const v = hi % 1;
|
const w = 1 - v;
|
let mg = 0;
|
|
/* eslint-disable max-statements-per-line */
|
switch (Math.floor(hi)) {
|
case 0:
|
pure[0] = 1; pure[1] = v; pure[2] = 0; break;
|
case 1:
|
pure[0] = w; pure[1] = 1; pure[2] = 0; break;
|
case 2:
|
pure[0] = 0; pure[1] = 1; pure[2] = v; break;
|
case 3:
|
pure[0] = 0; pure[1] = w; pure[2] = 1; break;
|
case 4:
|
pure[0] = v; pure[1] = 0; pure[2] = 1; break;
|
default:
|
pure[0] = 1; pure[1] = 0; pure[2] = w;
|
}
|
/* eslint-enable max-statements-per-line */
|
|
mg = (1.0 - c) * g;
|
|
return [
|
(c * pure[0] + mg) * 255,
|
(c * pure[1] + mg) * 255,
|
(c * pure[2] + mg) * 255
|
];
|
};
|
|
convert.hcg.hsv = function (hcg) {
|
const c = hcg[1] / 100;
|
const g = hcg[2] / 100;
|
|
const v = c + g * (1.0 - c);
|
let f = 0;
|
|
if (v > 0.0) {
|
f = c / v;
|
}
|
|
return [hcg[0], f * 100, v * 100];
|
};
|
|
convert.hcg.hsl = function (hcg) {
|
const c = hcg[1] / 100;
|
const g = hcg[2] / 100;
|
|
const l = g * (1.0 - c) + 0.5 * c;
|
let s = 0;
|
|
if (l > 0.0 && l < 0.5) {
|
s = c / (2 * l);
|
} else
|
if (l >= 0.5 && l < 1.0) {
|
s = c / (2 * (1 - l));
|
}
|
|
return [hcg[0], s * 100, l * 100];
|
};
|
|
convert.hcg.hwb = function (hcg) {
|
const c = hcg[1] / 100;
|
const g = hcg[2] / 100;
|
const v = c + g * (1.0 - c);
|
return [hcg[0], (v - c) * 100, (1 - v) * 100];
|
};
|
|
convert.hwb.hcg = function (hwb) {
|
const w = hwb[1] / 100;
|
const b = hwb[2] / 100;
|
const v = 1 - b;
|
const c = v - w;
|
let g = 0;
|
|
if (c < 1) {
|
g = (v - c) / (1 - c);
|
}
|
|
return [hwb[0], c * 100, g * 100];
|
};
|
|
convert.apple.rgb = function (apple) {
|
return [(apple[0] / 65535) * 255, (apple[1] / 65535) * 255, (apple[2] / 65535) * 255];
|
};
|
|
convert.rgb.apple = function (rgb) {
|
return [(rgb[0] / 255) * 65535, (rgb[1] / 255) * 65535, (rgb[2] / 255) * 65535];
|
};
|
|
convert.gray.rgb = function (args) {
|
return [args[0] / 100 * 255, args[0] / 100 * 255, args[0] / 100 * 255];
|
};
|
|
convert.gray.hsl = function (args) {
|
return [0, 0, args[0]];
|
};
|
|
convert.gray.hsv = convert.gray.hsl;
|
|
convert.gray.hwb = function (gray) {
|
return [0, 100, gray[0]];
|
};
|
|
convert.gray.cmyk = function (gray) {
|
return [0, 0, 0, gray[0]];
|
};
|
|
convert.gray.lab = function (gray) {
|
return [gray[0], 0, 0];
|
};
|
|
convert.gray.hex = function (gray) {
|
const val = Math.round(gray[0] / 100 * 255) & 0xFF;
|
const integer = (val << 16) + (val << 8) + val;
|
|
const string = integer.toString(16).toUpperCase();
|
return '000000'.substring(string.length) + string;
|
};
|
|
convert.rgb.gray = function (rgb) {
|
const val = (rgb[0] + rgb[1] + rgb[2]) / 3;
|
return [val / 255 * 100];
|
};
|
