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Diffstat (limited to 'node_modules/color-convert/conversions.js')
| -rw-r--r-- | node_modules/color-convert/conversions.js | 868 |
1 files changed, 0 insertions, 868 deletions
diff --git a/node_modules/color-convert/conversions.js b/node_modules/color-convert/conversions.js deleted file mode 100644 index 3217200..0000000 --- a/node_modules/color-convert/conversions.js +++ /dev/null @@ -1,868 +0,0 @@ -/* MIT license */ -var 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.) - -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]; -}; |