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