/*	Copyright (c) 2004-2006, The Dojo Foundation	All Rights Reserved.	Licensed under the Academic Free License version 2.1 or above OR the	modified BSD license. For more information on Dojo licensing, see:		http://dojotoolkit.org/community/licensing.shtml*/dojo.provide("dojo.gfx.Colorspace");dojo.require("dojo.lang.common");dojo.require("dojo.math.matrix");// to convert to YUV://   c.whitePoint = 'D65';//   c.RGBWorkingSpace = 'pal_secam_rgb';//   var out = c.convert([r,g,b], 'RGB', 'XYZ');//// to convert to YIQ://   c.whitePoint = 'D65';//   c.RGBWorkingSpace = 'ntsc_rgb';//   var out = c.convert([r,g,b], 'RGB', 'XYZ');//dojo.gfx.Colorspace = function(){	//	summary	//	An object for dealing with colorspace conversions.	this.whitePoint = 'D65';	this.stdObserver = '10';	this.chromaticAdaptationAlg = 'bradford';	this.RGBWorkingSpace = 's_rgb';	this.useApproxCIELabMapping = 1; // see http://www.brucelindbloom.com/LContinuity.html	this.chainMaps = {		'RGB_to_xyY'  : ['XYZ'],		'xyY_to_RGB'  : ['XYZ'],		'RGB_to_Lab'  : ['XYZ'],		'Lab_to_RGB'  : ['XYZ'],		'RGB_to_LCHab': ['XYZ', 'Lab'],		'LCHab_to_RGB': ['Lab'],		'xyY_to_Lab'  : ['XYZ'],		'Lab_to_xyY'  : ['XYZ'],		'XYZ_to_LCHab': ['Lab'],		'LCHab_to_XYZ': ['Lab'],		'xyY_to_LCHab': ['XYZ', 'Lab'],		'LCHab_to_xyY': ['Lab', 'XYZ'],		'RGB_to_Luv'  : ['XYZ'],		'Luv_to_RGB'  : ['XYZ'],		'xyY_to_Luv'  : ['XYZ'],		'Luv_to_xyY'  : ['XYZ'],		'Lab_to_Luv'  : ['XYZ'],		'Luv_to_Lab'  : ['XYZ'],		'LCHab_to_Luv': ['Lab', 'XYZ'],		'Luv_to_LCHab': ['XYZ', 'Lab'],		'RGB_to_LCHuv'  : ['XYZ', 'Luv'],		'LCHuv_to_RGB'  : ['Luv', 'XYZ'],		'XYZ_to_LCHuv'  : ['Luv'],		'LCHuv_to_XYZ'  : ['Luv'],		'xyY_to_LCHuv'  : ['XYZ', 'Luv'],		'LCHuv_to_xyY'  : ['Luv', 'XYZ'],		'Lab_to_LCHuv'  : ['XYZ', 'Luv'],		'LCHuv_to_Lab'  : ['Luv', 'XYZ'],		'LCHab_to_LCHuv': ['Lab', 'XYZ', 'Luv'],		'LCHuv_to_LCHab': ['Luv', 'XYZ', 'Lab'],		'XYZ_to_CMY'    : ['RGB'],		'CMY_to_XYZ'    : ['RGB'],		'xyY_to_CMY'    : ['RGB'],		'CMY_to_xyY'    : ['RGB'],		'Lab_to_CMY'    : ['RGB'],		'CMY_to_Lab'    : ['RGB'],		'LCHab_to_CMY'  : ['RGB'],		'CMY_to_LCHab'  : ['RGB'],		'Luv_to_CMY'    : ['RGB'],		'CMY_to_Luv'    : ['RGB'],		'LCHuv_to_CMY'  : ['RGB'],		'CMY_to_LCHuv'  : ['RGB'],		'XYZ_to_HSL'    : ['RGB'],		'HSL_to_XYZ'    : ['RGB'],		'xyY_to_HSL'    : ['RGB'],		'HSL_to_xyY'    : ['RGB'],		'Lab_to_HSL'    : ['RGB'],		'HSL_to_Lab'    : ['RGB'],		'LCHab_to_HSL'  : ['RGB'],		'HSL_to_LCHab'  : ['RGB'],		'Luv_to_HSL'    : ['RGB'],		'HSL_to_Luv'    : ['RGB'],		'LCHuv_to_HSL'  : ['RGB'],		'HSL_to_LCHuv'  : ['RGB'],		'CMY_to_HSL'    : ['RGB'],		'HSL_to_CMY'    : ['RGB'],		'CMYK_to_HSL'   : ['RGB'],		'HSL_to_CMYK'   : ['RGB'],		'XYZ_to_HSV'    : ['RGB'],		'HSV_to_XYZ'    : ['RGB'],		'xyY_to_HSV'    : ['RGB'],		'HSV_to_xyY'    : ['RGB'],		'Lab_to_HSV'    : ['RGB'],		'HSV_to_Lab'    : ['RGB'],		'LCHab_to_HSV'  : ['RGB'],		'HSV_to_LCHab'  : ['RGB'],		'Luv_to_HSV'    : ['RGB'],		'HSV_to_Luv'    : ['RGB'],		'LCHuv_to_HSV'  : ['RGB'],		'HSV_to_LCHuv'  : ['RGB'],		'CMY_to_HSV'    : ['RGB'],		'HSV_to_CMY'    : ['RGB'],		'CMYK_to_HSV'   : ['RGB'],		'HSV_to_CMYK'   : ['RGB'],		'HSL_to_HSV'    : ['RGB'],		'HSV_to_HSL'    : ['RGB'],		'XYZ_to_CMYK'   : ['RGB'],		'CMYK_to_XYZ'   : ['RGB'],		'xyY_to_CMYK'   : ['RGB'],		'CMYK_to_xyY'   : ['RGB'],		'Lab_to_CMYK'   : ['RGB'],		'CMYK_to_Lab'   : ['RGB'],		'LCHab_to_CMYK' : ['RGB'],		'CMYK_to_LCHab' : ['RGB'],		'Luv_to_CMYK'   : ['RGB'],		'CMYK_to_Luv'   : ['RGB'],		'LCHuv_to_CMYK' : ['RGB'],		'CMYK_to_LCHuv' : ['RGB']	};	return this;}dojo.gfx.Colorspace.prototype.convert = function(col, model_from, model_to){	var k = model_from+'_to_'+model_to;	if (this[k]){		return this[k](col);	}else{		if (this.chainMaps[k]){			var cur = model_from;			var models = this.chainMaps[k].concat();			models.push(model_to);			for(var i=0; i<models.length; i++){				col = this.convert(col, cur, models[i]);				cur = models[i];			}			return col;		}else{			dojo.debug("Can't convert from "+model_from+' to '+model_to);		}	}}dojo.gfx.Colorspace.prototype.munge = function(keys, args){	if (dojo.lang.isArray(args[0])){		args = args[0];	}	var out = new Array();	for (var i=0; i<keys.length; i++){		out[keys.charAt(i)] = args[i];	}	return out;}dojo.gfx.Colorspace.prototype.getWhitePoint = function(){	var x = 0;	var y = 0;	var t = 0;	// ref: http://en.wikipedia.org/wiki/White_point	// TODO: i need some good/better white point values	switch(this.stdObserver){		case '2' :			switch(this.whitePoint){				case 'E'   : x=1/3    ; y=1/3    ; t=5400; break; //Equal energy				case 'D50' : x=0.34567; y=0.35850; t=5000; break;				case 'D55' : x=0.33242; y=0.34743; t=5500; break;				case 'D65' : x=0.31271; y=0.32902; t=6500; break;				case 'D75' : x=0.29902; y=0.31485; t=7500; break;				case 'A'   : x=0.44757; y=0.40745; t=2856; break; //Incandescent tungsten				case 'B'   : x=0.34842; y=0.35161; t=4874; break;				case 'C'   : x=0.31006; y=0.31616; t=6774; break;				case '9300': x=0.28480; y=0.29320; t=9300; break; //Blue phosphor monitors				case 'F2'  : x=0.37207; y=0.37512; t=4200; break; //Cool White Fluorescent				case 'F7'  : x=0.31285; y=0.32918; t=6500; break; //Narrow Band Daylight Fluorescent				case 'F11' : x=0.38054; y=0.37691; t=4000; break; //Narrow Band White Fluorescent				default: dojo.debug('White point '+this.whitePoint+" isn't defined for Std. Observer "+this.strObserver);			};			break;		case '10' :			switch(this.whitePoint){				case 'E'   : x=1/3    ; y=1/3    ; t=5400; break; //Equal energy				case 'D50' : x=0.34773; y=0.35952; t=5000; break;				case 'D55' : x=0.33411; y=0.34877; t=5500; break;				case 'D65' : x=0.31382; y=0.33100; t=6500; break;				case 'D75' : x=0.29968; y=0.31740; t=7500; break;				case 'A'   : x=0.45117; y=0.40594; t=2856; break; //Incandescent tungsten				case 'B'   : x=0.3498 ; y=0.3527 ; t=4874; break;				case 'C'   : x=0.31039; y=0.31905; t=6774; break;				case 'F2'  : x=0.37928; y=0.36723; t=4200; break; //Cool White Fluorescent				case 'F7'  : x=0.31565; y=0.32951; t=6500; break; //Narrow Band Daylight Fluorescent				case 'F11' : x=0.38543; y=0.37110; t=4000; break; //Narrow Band White Fluorescent				default: dojo.debug('White point '+this.whitePoint+" isn't defined for Std. Observer "+this.strObserver);			};			break;		default:			dojo.debug("Std. Observer "+this.strObserver+" isn't defined");	}	var z = 1 - x - y;	var wp = {'x':x, 'y':y, 'z':z, 't':t};	wp.Y = 1;	var XYZ = this.xyY_to_XYZ([wp.x, wp.y, wp.Y]);	wp.X = XYZ[0];	wp.Y = XYZ[1];	wp.Z = XYZ[2];	return wp;}dojo.gfx.Colorspace.prototype.getPrimaries = function(){	// ref: http://www.fho-emden.de/~hoffmann/ciexyz29082000.pdf	// ref: http://www.brucelindbloom.com/index.html?Eqn_RGB_XYZ_Matrix.html	var m = [];	switch(this.RGBWorkingSpace){		case 'adobe_rgb_1998'	: m = [2.2, 'D65', 0.6400, 0.3300, 0.297361, 0.2100, 0.7100, 0.627355, 0.1500, 0.0600, 0.075285]; break;		case 'apple_rgb'	: m = [1.8, 'D65', 0.6250, 0.3400, 0.244634, 0.2800, 0.5950, 0.672034, 0.1550, 0.0700, 0.083332]; break;		case 'best_rgb'		: m = [2.2, 'D50', 0.7347, 0.2653, 0.228457, 0.2150, 0.7750, 0.737352, 0.1300, 0.0350, 0.034191]; break;		case 'beta_rgb'		: m = [2.2, 'D50', 0.6888, 0.3112, 0.303273, 0.1986, 0.7551, 0.663786, 0.1265, 0.0352, 0.032941]; break;		case 'bruce_rgb'	: m = [2.2, 'D65', 0.6400, 0.3300, 0.240995, 0.2800, 0.6500, 0.683554, 0.1500, 0.0600, 0.075452]; break;		case 'cie_rgb'		: m = [2.2, 'E'  , 0.7350, 0.2650, 0.176204, 0.2740, 0.7170, 0.812985, 0.1670, 0.0090, 0.010811]; break;		case 'color_match_rgb'	: m = [1.8, 'D50', 0.6300, 0.3400, 0.274884, 0.2950, 0.6050, 0.658132, 0.1500, 0.0750, 0.066985]; break;		case 'don_rgb_4'	: m = [2.2, 'D50', 0.6960, 0.3000, 0.278350, 0.2150, 0.7650, 0.687970, 0.1300, 0.0350, 0.033680]; break;		case 'eci_rgb'		: m = [1.8, 'D50', 0.6700, 0.3300, 0.320250, 0.2100, 0.7100, 0.602071, 0.1400, 0.0800, 0.077679]; break;		case 'ekta_space_ps5'	: m = [2.2, 'D50', 0.6950, 0.3050, 0.260629, 0.2600, 0.7000, 0.734946, 0.1100, 0.0050, 0.004425]; break;		case 'ntsc_rgb'		: m = [2.2, 'C'  , 0.6700, 0.3300, 0.298839, 0.2100, 0.7100, 0.586811, 0.1400, 0.0800, 0.114350]; break;		case 'pal_secam_rgb'	: m = [2.2, 'D65', 0.6400, 0.3300, 0.222021, 0.2900, 0.6000, 0.706645, 0.1500, 0.0600, 0.071334]; break;		case 'pro_photo_rgb'	: m = [1.8, 'D50', 0.7347, 0.2653, 0.288040, 0.1596, 0.8404, 0.711874, 0.0366, 0.0001, 0.000086]; break;		case 'smpte-c_rgb'	: m = [2.2, 'D65', 0.6300, 0.3400, 0.212395, 0.3100, 0.5950, 0.701049, 0.1550, 0.0700, 0.086556]; break;		case 's_rgb'		: m = [2.2, 'D65', 0.6400, 0.3300, 0.212656, 0.3000, 0.6000, 0.715158, 0.1500, 0.0600, 0.072186]; break;		case 'wide_gamut_rgb'	: m = [2.2, 'D50', 0.7350, 0.2650, 0.258187, 0.1150, 0.8260, 0.724938, 0.1570, 0.0180, 0.016875]; break;		default: dojo.debug("RGB working space "+this.RGBWorkingSpace+" isn't defined");	}	var p = {		name: this.RGBWorkingSpace,		gamma:m[0],		wp:m[1],		xr:m[2],		yr:m[3],		Yr:m[4],		xg:m[5],		yg:m[6],		Yg:m[7],		xb:m[8],		yb:m[9],		Yb:m[10]	};	// if WP doesn't match current WP, convert the primaries over	if (p.wp != this.whitePoint){		var r = this.XYZ_to_xyY( this.chromaticAdaptation( this.xyY_to_XYZ([p.xr, p.yr, p.Yr]), p.wp, this.whitePoint ) );		var g = this.XYZ_to_xyY( this.chromaticAdaptation( this.xyY_to_XYZ([p.xg, p.yg, p.Yg]), p.wp, this.whitePoint ) );		var b = this.XYZ_to_xyY( this.chromaticAdaptation( this.xyY_to_XYZ([p.xb, p.yb, p.Yb]), p.wp, this.whitePoint ) );		p.xr = r[0];		p.yr = r[1];		p.Yr = r[2];		p.xg = g[0];		p.yg = g[1];		p.Yg = g[2];		p.xb = b[0];		p.yb = b[1];		p.Yb = b[2];		p.wp = this.whitePoint;	}	p.zr = 1 - p.xr - p.yr;	p.zg = 1 - p.xg - p.yg;	p.zb = 1 - p.xb - p.yb;	return p;}dojo.gfx.Colorspace.prototype.epsilon = function(){	return this.useApproxCIELabMapping ? 0.008856 : 216 / 24289;}dojo.gfx.Colorspace.prototype.kappa = function(){	return this.useApproxCIELabMapping ? 903.3 : 24389 / 27;}dojo.gfx.Colorspace.prototype.XYZ_to_xyY = function(){	var src = this.munge('XYZ', arguments);	var sum = src.X + src.Y + src.Z;	if (sum == 0){		var wp = this.getWhitePoint();		var x = wp.x;		var y = wp.y;	}else{		var x = src.X / sum;		var y = src.Y / sum;	}	var Y = src.Y;	return [x, y, Y];}dojo.gfx.Colorspace.prototype.xyY_to_XYZ = function(){	var src = this.munge('xyY', arguments);	if (src.y == 0){		var X = 0;		var Y = 0;		var Z = 0;	}else{		var X = (src.x * src.Y) / src.y;		var Y = src.Y;		var Z = ((1 - src.x - src.y) * src.Y) / src.y;	}	return [X, Y, Z];}dojo.gfx.Colorspace.prototype.RGB_to_XYZ = function(){	var src = this.munge('RGB', arguments);	var m = this.getRGB_XYZ_Matrix();	var pr = this.getPrimaries();	if (this.RGBWorkingSpace == 's_rgb'){		var r = (src.R > 0.04045) ? Math.pow(((src.R + 0.055) / 1.055), 2.4) : src.R / 12.92;		var g = (src.G > 0.04045) ? Math.pow(((src.G + 0.055) / 1.055), 2.4) : src.G / 12.92;		var b = (src.B > 0.04045) ? Math.pow(((src.B + 0.055) / 1.055), 2.4) : src.B / 12.92;	}else{		var r = Math.pow(src.R, pr.gamma);		var g = Math.pow(src.G, pr.gamma);		var b = Math.pow(src.B, pr.gamma);	}	var XYZ = dojo.math.matrix.multiply([[r, g, b]], m);	return [XYZ[0][0], XYZ[0][1], XYZ[0][2]];}dojo.gfx.Colorspace.prototype.XYZ_to_RGB = function(){	var src = this.munge('XYZ', arguments);	var mi = this.getXYZ_RGB_Matrix();	var pr = this.getPrimaries();	var rgb = dojo.math.matrix.multiply([[src.X, src.Y, src.Z]], mi);	var r = rgb[0][0];	var g = rgb[0][1];	var b = rgb[0][2];	if (this.RGBWorkingSpace == 's_rgb'){		var R = (r > 0.0031308) ? (1.055 * Math.pow(r, 1.0/2.4)) - 0.055 : 12.92 * r;		var G = (g > 0.0031308) ? (1.055 * Math.pow(g, 1.0/2.4)) - 0.055 : 12.92 * g;		var B = (b > 0.0031308) ? (1.055 * Math.pow(b, 1.0/2.4)) - 0.055 : 12.92 * b;	}else{		var R = Math.pow(r, 1/pr.gamma);		var G = Math.pow(g, 1/pr.gamma);		var B = Math.pow(b, 1/pr.gamma);	}	return [R, G, B];}dojo.gfx.Colorspace.prototype.XYZ_to_Lab = function(){	var src = this.munge('XYZ', arguments);	var wp = this.getWhitePoint();	var xr = src.X / wp.X;	var yr = src.Y / wp.Y;	var zr = src.Z / wp.Z;	var fx = (xr > this.epsilon()) ? Math.pow(xr, 1/3) : (this.kappa() * xr + 16) / 116;	var fy = (yr > this.epsilon()) ? Math.pow(yr, 1/3) : (this.kappa() * yr + 16) / 116;	var fz = (zr > this.epsilon()) ? Math.pow(zr, 1/3) : (this.kappa() * zr + 16) / 116;	var L = 116 * fy - 16;	var a = 500 * (fx - fy);	var b = 200 * (fy - fz);	return [L, a, b];}dojo.gfx.Colorspace.prototype.Lab_to_XYZ = function(){	var src = this.munge('Lab', arguments);	var wp = this.getWhitePoint();	var yr = (src.L > (this.kappa() * this.epsilon())) ? Math.pow((src.L + 16) / 116, 3) : src.L / this.kappa();	var fy = (yr > this.epsilon()) ? (src.L + 16) / 116 : (this.kappa() * yr + 16) / 116;	var fx = (src.a / 500) + fy;	var fz = fy - (src.b / 200);	var fxcube = Math.pow(fx, 3);	var fzcube = Math.pow(fz, 3);	var xr = (fxcube > this.epsilon()) ? fxcube : (116 * fx - 16) / this.kappa();	var zr = (fzcube > this.epsilon()) ? fzcube : (116 * fz - 16) / this.kappa();	var X = xr * wp.X;	var Y = yr * wp.Y;	var Z = zr * wp.Z;	return [X, Y, Z];}dojo.gfx.Colorspace.prototype.Lab_to_LCHab = function(){	var src = this.munge('Lab', arguments);	var L = src.L;	var C = Math.pow(src.a * src.a + src.b * src.b, 0.5);	var H = Math.atan2(src.b, src.a) * (180 / Math.PI);	if (H < 0){ H += 360; }