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// 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.) var reverseKeywords = {}; for (var key in cssKeywords) { if (cssKeywords.hasOwnProperty(key)) { reverseKeywords[cssKeywords[key]] = key; } } var convert = module.exports = { 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']} }; // hide .channels and .labels properties for (var model in convert) { if (convert.hasOwnProperty(model)) { 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); } var channels = convert[model].channels; var labels = convert[model].labels; 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) { var r = rgb[0] / 255; var g = rgb[1] / 255; var b = rgb[2] / 255; var min = Math.min(r, g, b); var max = Math.max(r, g, b); var delta = max - min; var h; var s; var l; 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; } 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) { var rdif; var gdif; var bdif; var h; var s; var r = rgb[0] / 255; var g = rgb[1] / 255; var b = rgb[2] / 255; var v = Math.max(r, g, b); var diff = v - Math.min(r, g, b); var diffc = function (c) { return (v - c) / 6 / diff + 1 / 2; }; if (diff === 0) { h = 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) { var r = rgb[0]; var g = rgb[1]; var b = rgb[2]; var h = convert.rgb.hsl(rgb)[0]; var 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) { var r = rgb[0] / 255; var g = rgb[1] / 255; var b = rgb[2] / 255; var c; var m; var y; var k; k = Math.min(1 - r, 1 - g, 1 - b); c = (1 - r - k) / (1 - k) || 0; m = (1 - g - k) / (1 - k) || 0; y = (1 - b - k) / (1 - k) || 0; return [c * 100, m * 100, y * 100, k * 100]; }; /** * See https://en.m.wikipedia.org/wiki/Euclidean_distance#Squared_Euclidean_distance * */ function comparativeDistance(x, y) { return ( Math.pow(x[0] - y[0], 2) + Math.pow(x[1] - y[1], 2) + Math.pow(x[2] - y[2], 2) ); } convert.rgb.keyword = function (rgb) { var reversed = reverseKeywords[rgb]; if (reversed) { return reversed; } var currentClosestDistance = Infinity; var currentClosestKeyword; for (var keyword in cssKeywords) { if (cssKeywords.hasOwnProperty(keyword)) { var value = cssKeywords[keyword]; // Compute comparative distance var 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) { var r = rgb[0] / 255; var g = rgb[1] / 255; var b = rgb[2] / 255; // assume sRGB r = r > 0.04045 ? Math.pow(((r + 0.055) / 1.055), 2.4) : (r / 12.92); g = g > 0.04045 ? Math.pow(((g + 0.055) / 1.055), 2.4) : (g / 12.92); b = b > 0.04045 ? Math.pow(((b + 0.055) / 1.055), 2.4) : (b / 12.92); var x = (r * 0.4124) + (g * 0.3576) + (b * 0.1805); var y = (r * 0.2126) + (g * 0.7152) + (b * 0.0722); var z = (r * 0.0193) + (g * 0.1192) + (b * 0.9505); return [x * 100, y * 100, z * 100]; }; convert.rgb.lab = function (rgb) { var xyz = convert.rgb.xyz(rgb); var x = xyz[0]; var y = xyz[1]; var z = xyz[2]; var l; var a; var b; x /= 95.047; y /= 100; z /= 108.883; x = x > 0.008856 ? Math.pow(x, 1 / 3) : (7.787 * x) + (16 / 116); y = y > 0.008856 ? Math.pow(y, 1 / 3) : (7.787 * y) + (16 / 116); z = z > 0.008856 ? Math.pow(z, 1 / 3) : (7.787 * z) + (16 / 116); l = (116 * y) - 16; a = 500 * (x - y); b = 200 * (y - z); return [l, a, b]; }; convert.hsl.rgb = function (hsl) { var h = hsl[0] / 360; var s = hsl[1] / 100; var l = hsl[2] / 100; var t1; var t2; var t3; var rgb; var 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; } t1 = 2 * l - t2; rgb = [0, 0, 0]; for (var 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) { var h = hsl[0]; var s = hsl[1] / 100; var l = hsl[2] / 100; var smin = s; var lmin = Math.max(l, 0.01); var sv; var v; l *= 2; s *= (l <= 1) ? l : 2 - l; smin *= lmin <= 1 ? lmin : 2 - lmin; v = (l + s) / 2; sv = l === 0 ? (2 * smin) / (lmin + smin) : (2 * s) / (l + s); return [h, sv * 100, v * 100]; }; convert.hsv.rgb = function (hsv) { var h = hsv[0] / 60; var s = hsv[1] / 100; var v = hsv[2] / 100; var hi = Math.floor(h) % 6; var f = h - Math.floor(h); var p = 255 * v * (1 - s); var q = 255 * v * (1 - (s * f)); var 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) { var h = hsv[0]; var s = hsv[1] / 100; var v = hsv[2] / 100; var vmin = Math.max(v, 0.01); var lmin; var sl; var l; l = (2 - s) * v; 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) { var h = hwb[0] / 360; var wh = hwb[1] / 100; var bl = hwb[2] / 100; var ratio = wh + bl; var i; var v; var f; var n; // wh + bl cant be > 1 if (ratio > 1) { wh /= ratio; bl /= ratio; } i = Math.floor(6 * h); v = 1 - bl; f = 6 * h - i; if ((i & 0x01) !== 0) { f = 1 - f; } n = wh + f * (v - wh); // linear interpolation var r; var g; var b; 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; } return [r * 255, g * 255, b * 255]; }; convert.cmyk.rgb = function (cmyk) { var c = cmyk[0] / 100; var m = cmyk[1] / 100; var y = cmyk[2] / 100; var k = cmyk[3] / 100; var r; var g; var b; r = 1 - Math.min(1, c * (1 - k) + k); g = 1 - Math.min(1, m * (1 - k) + k); b = 1 - Math.min(1, y * (1 - k) + k); return [r * 255, g * 255, b * 255]; }; convert.xyz.rgb = function (xyz) { var x = xyz[0] / 100; var y = xyz[1] / 100; var z = xyz[2] / 100; var r; var g; var 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 * Math.pow(r, 1.0 / 2.4)) - 0.055) : r * 12.92; g = g > 0.0031308 ? ((1.055 * Math.pow(g, 1.0 / 2.4)) - 0.055) : g * 12.92; b = b > 0.0031308 ? ((1.055 * Math.pow(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) { var x = xyz[0]; var y = xyz[1]; var z = xyz[2]; var l; var a; var b; x /= 95.047; y /= 100; z /= 108.883; x = x > 0.008856 ? Math.pow(x, 1 / 3) : (7.787 * x) + (16 / 116); y = y > 0.008856 ? Math.pow(y, 1 / 3) : (7.787 * y) + (16 / 116); z = z > 0.008856 ? Math.pow(z, 1 / 3) : (7.787 * z) + (16 / 116); l = (116 * y) - 16; a = 500 * (x - y); b = 200 * (y - z); return [l, a, b]; }; convert.lab.xyz = function (lab) { var l = lab[0]; var a = lab[1]; var b = lab[2]; var x; var y; var z; y = (l + 16) / 116; x = a / 500 + y; z = y - b / 200; var y2 = Math.pow(y, 3); var x2 = Math.pow(x, 3); var z2 = Math.pow(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) { var l = lab[0]; var a = lab[1]; var b = lab[2]; var hr; var h; var c; hr = Math.atan2(b, a); h = hr * 360 / 2 / Math.PI; if (h < 0) { h += 360; } c = Math.sqrt(a * a + b * b); return [l, c, h]; }; convert.lch.lab = function (lch) { var l = lch[0]; var c = lch[1]; var h = lch[2]; var a; var b; var hr; hr = h / 360 * 2 * Math.PI; a = c * Math.cos(hr); b = c * Math.sin(hr); return [l, a, b]; }; convert.rgb.ansi16 = function (args) { var r = args[0]; var g = args[1]; var b = args[2]; var value = 1 in arguments ? arguments[1] : convert.rgb.hsv(args)[2]; // hsv -> ansi16 optimization value = Math.round(value / 50); if (value === 0) { return 30; } var 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) { var r = args[0]; var g = args[1]; var 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; } var 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) { var 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]; } var mult = (~~(args > 50) + 1) * 0.5; var r = ((color & 1) * mult) * 255; var g = (((color >> 1) & 1) * mult) * 255; var b = (((color >> 2) & 1) * mult) * 255; return [r, g, b]; }; convert.ansi256.rgb = function (args) { // handle greyscale if (args >= 232) { var c = (args - 232) * 10 + 8; return [c, c, c]; } args -= 16; var rem; var r = Math.floor(args / 36) / 5 * 255; var g = Math.floor((rem = args % 36) / 6) / 5 * 255; var b = (rem % 6) / 5 * 255; return [r, g, b]; }; convert.rgb.hex = function (args) { var integer = ((Math.round(args[0]) & 0xFF) << 16) + ((Math.round(args[1]) & 0xFF) << 8) + (Math.round(args[2]) & 0xFF); var string = integer.toString(16).toUpperCase(); return '000000'.substring(string.length) + string; }; convert.hex.rgb = function (args) { var match = args.toString(16).match(/[a-f0-9]{6}|[a-f0-9]{3}/i); if (!match) { return [0, 0, 0]; } var colorString = match[0]; if (match[0].length === 3) { colorString = colorString.split('').map(function (char) { return char + char; }).join(''); } var integer = parseInt(colorString, 16); var r = (integer >> 16) & 0xFF; var g = (integer >> 8) & 0xFF; var b = integer & 0xFF; return [r, g, b]; }; convert.rgb.hcg = function (rgb) { var r = rgb[0] / 255; var g = rgb[1] / 255; var b = rgb[2] / 255; var max = Math.max(Math.max(r, g), b); var min = Math.min(Math.min(r, g), b); var chroma = (max - min); var grayscale; var 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 + 4; } hue /= 6; hue %= 1; return [hue * 360, chroma * 100, grayscale * 100]; }; convert.hsl.hcg = function (hsl) { var s = hsl[1] / 100; var l = hsl[2] / 100; var c = 1; var f = 0; if (l < 0.5) { c = 2.0 * s * l; } else { c = 2.0 * s * (1.0 - l); } if (c < 1.0) { f = (l - 0.5 * c) / (1.0 - c); } return [hsl[0], c * 100, f * 100]; }; convert.hsv.hcg = function (hsv) { var s = hsv[1] / 100; var v = hsv[2] / 100; var c = s * v; var f = 0; if (c < 1.0) { f = (v - c) / (1 - c); } return [hsv[0], c * 100, f * 100]; }; convert.hcg.rgb = function (hcg) { var h = hcg[0] / 360; var c = hcg[1] / 100; var g = hcg[2] / 100; if (c === 0.0) { return [g * 255, g * 255, g * 255]; } var pure = [0, 0, 0]; var hi = (h % 1) * 6; var v = hi % 1; var w = 1 - v; var mg = 0; 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; } 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) { var c = hcg[1] / 100; var g = hcg[2] / 100; var v = c + g * (1.0 - c); var f = 0; if (v > 0.0) { f = c / v; } return [hcg[0], f * 100, v * 100]; }; convert.hcg.hsl = function (hcg) { var c = hcg[1] / 100; var g = hcg[2] / 100; var l = g * (1.0 - c) + 0.5 * c; var 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) { var c = hcg[1] / 100; var g = hcg[2] / 100; var v = c + g * (1.0 - c); return [hcg[0], (v - c) * 100, (1 - v) * 100]; }; convert.hwb.hcg = function (hwb) { var w = hwb[1] / 100; var b = hwb[2] / 100; var v = 1 - b; var c = v - w; var 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 = convert.gray.hsv = function (args) { return [0, 0, args[0]]; }; 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) { var val = Math.round(gray[0] / 100 * 255) & 0xFF; var integer = (val << 16) + (val << 8) + val; var string = integer.toString(16).toUpperCase(); return '000000'.substring(string.length) + string; }; convert.rgb.gray = function (rgb) { var val = (rgb[0] + rgb[1] + rgb[2]) / 3; return [val / 255 * 100]; };