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File Content: conversions.js

/* 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 r = rgb[0];
	var g = rgb[1];
	var b = rgb[2];
	var min = Math.min(r, g, b);
	var max = Math.max(r, g, b);
	var delta = max - min;
	var h;
	var s;
	var v;

if (max === 0) {
		s = 0;
	} else {
		s = (delta / max * 1000) / 10;
	}

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;
	}

v = ((max / 255) * 1000) / 10;

return [h, s, v];
};

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];
};

Name	Size	Permission
CHANGELOG.md	1417 bytes	0644
LICENSE	1087 bytes	0644
README.md	2853 bytes	0644
conversions.js	16750 bytes	0644
index.js	1725 bytes	0644
package.json	1880 bytes	0644
route.js	2227 bytes	0644