/*

 Holder - 2.2 - client side image placeholders

 (c) 2012-2013 Ivan Malopinsky / http://imsky.co

 Provided under the MIT License.

 Commercial use requires attribution.

 */

 var Holder = Holder || {};

 (function (app, win) {

 var preempted = false,

 fallback = false,

 canvas = document.createElement('canvas');

 var dpr = 1, bsr = 1;

 var resizable_images = [];

 if (!canvas.getContext) {

 	fallback = true;

 } else {

 	if (canvas.toDataURL("image/png")

 		.indexOf("data:image/png") < 0) {

 		//Android doesn't support data URI

 		fallback = true;

 	} else {

 		var ctx = canvas.getContext("2d");

 	}

 }

 if(!fallback){

     dpr = window.devicePixelRatio || 1,

     bsr = ctx.webkitBackingStorePixelRatio || ctx.mozBackingStorePixelRatio || ctx.msBackingStorePixelRatio || ctx.oBackingStorePixelRatio || ctx.backingStorePixelRatio || 1;

 }

 var ratio = dpr / bsr;

 var settings = {

 	domain: "holder.js",

 	images: "img",

 	bgnodes: ".holderjs",

 	themes: {

 		"gray": {

 			background: "#eee",

 			foreground: "#aaa",

 			size: 12

 		},

 		"social": {

 			background: "#3a5a97",

 			foreground: "#fff",

 			size: 12

 		},

 		"industrial": {

 			background: "#434A52",

 			foreground: "#C2F200",

 			size: 12

 		},

 		"sky": {

 			background: "#0D8FDB",

 			foreground: "#fff",

 			size: 12

 		},

 		"vine": {

 			background: "#39DBAC",

 			foreground: "#1E292C",

 			size: 12

 		},

 		"lava": {

 			background: "#F8591A",

 			foreground: "#1C2846",

 			size: 12

 		}

 	},

 	stylesheet: ""

 };

 app.flags = {

 	dimensions: {

 		regex: /^(\d+)x(\d+)$/,

 		output: function (val) {

 			var exec = this.regex.exec(val);

 			return {

 				width: +exec[1],

 				height: +exec[2]

 			}

 		}

 	},

 	fluid: {

 		regex: /^([0-9%]+)x([0-9%]+)$/,

 		output: function (val) {

 			var exec = this.regex.exec(val);

 			return {

 				width: exec[1],

 				height: exec[2]

 			}

 		}

 	},

 	colors: {

 		regex: /#([0-9a-f]{3,})\:#([0-9a-f]{3,})/i,

 		output: function (val) {

 			var exec = this.regex.exec(val);

 			return {

 				size: settings.themes.gray.size,

 				foreground: "#" + exec[2],

 				background: "#" + exec[1]

 			}

 		}

 	},

 	text: {

 		regex: /text\:(.*)/,

 		output: function (val) {

 			return this.regex.exec(val)[1];

 		}

 	},

 	font: {

 		regex: /font\:(.*)/,

 		output: function (val) {

 			return this.regex.exec(val)[1];

 		}

 	},

 	auto: {

 		regex: /^auto$/

 	},

 	textmode: {

 		regex: /textmode\:(.*)/,

 		output: function(val){

 			return this.regex.exec(val)[1];

 		}

 	}

 }

 //getElementsByClassName polyfill

 document.getElementsByClassName||(document.getElementsByClassName=function(e){var t=document,n,r,i,s=[];if(t.querySelectorAll)return t.querySelectorAll("."+e);if(t.evaluate){r=".//*[contains(concat(' ', @class, ' '), ' "+e+" ')]",n=t.evaluate(r,t,null,0,null);while(i=n.iterateNext())s.push(i)}else{n=t.getElementsByTagName("*"),r=new RegExp("(^|\\s)"+e+"(\\s|$)");for(i=0;i<n.length;i++)r.test(n[i].className)&&s.push(n[i])}return s})

 //getComputedStyle polyfill

 window.getComputedStyle||(window.getComputedStyle=function(e){return this.el=e,this.getPropertyValue=function(t){var n=/(\-([a-z]){1})/g;return t=="float"&&(t="styleFloat"),n.test(t)&&(t=t.replace(n,function(){return arguments[2].toUpperCase()})),e.currentStyle[t]?e.currentStyle[t]:null},this})

 //http://javascript.nwbox.com/ContentLoaded by Diego Perini with modifications

 function contentLoaded(n,t){var l="complete",s="readystatechange",u=!1,h=u,c=!0,i=n.document,a=i.documentElement,e=i.addEventListener?"addEventListener":"attachEvent",v=i.addEventListener?"removeEventListener":"detachEvent",f=i.addEventListener?"":"on",r=function(e){(e.type!=s||i.readyState==l)&&((e.type=="load"?n:i)[v](f+e.type,r,u),!h&&(h=!0)&&t.call(n,null))},o=function(){try{a.doScroll("left")}catch(n){setTimeout(o,50);return}r("poll")};if(i.readyState==l)t.call(n,"lazy");else{if(i.createEventObject&&a.doScroll){try{c=!n.frameElement}catch(y){}c&&o()}i[e](f+"DOMContentLoaded",r,u),i[e](f+s,r,u),n[e](f+"load",r,u)}}

 //https://gist.github.com/991057 by Jed Schmidt with modifications

 function selector(a){

 	a=a.match(/^(\W)?(.*)/);var b=document["getElement"+(a[1]?a[1]=="#"?"ById":"sByClassName":"sByTagName")](a[2]);

 	var ret=[];	b!==null&&(b.length?ret=b:b.length===0?ret=b:ret=[b]);	return ret;

 }

 //shallow object property extend

 function extend(a,b){

 	var c={};

 	for(var i in a){

 		if(a.hasOwnProperty(i)){

 			c[i]=a[i];

 		}

 	}

 	for(var i in b){

 		if(b.hasOwnProperty(i)){

 			c[i]=b[i];

 		}

 	}

 	return c

 }

 //hasOwnProperty polyfill

 if (!Object.prototype.hasOwnProperty)

     /*jshint -W001, -W103 */

     Object.prototype.hasOwnProperty = function(prop) {

 		var proto = this.__proto__ || this.constructor.prototype;

 		return (prop in this) && (!(prop in proto) || proto[prop] !== this[prop]);

 	}

     /*jshint +W001, +W103 */

 function text_size(width, height, template) {

 	height = parseInt(height, 10);

 	width = parseInt(width, 10);

 	var bigSide = Math.max(height, width)

 	var smallSide = Math.min(height, width)

 	var scale = 1 / 12;

 	var newHeight = Math.min(smallSide * 0.75, 0.75 * bigSide * scale);

 	return {

 		height: Math.round(Math.max(template.size, newHeight))

 	}

 }

 function draw(args) {

 	var ctx = args.ctx;

 	var dimensions = args.dimensions;

 	var template = args.template;

 	var ratio = args.ratio;

 	var holder = args.holder;

 	var literal = holder.textmode == "literal";

 	var exact = holder.textmode == "exact";

 	var ts = text_size(dimensions.width, dimensions.height, template);

 	var text_height = ts.height;

 	var width = dimensions.width * ratio,

 		height = dimensions.height * ratio;

 	var font = template.font ? template.font : "sans-serif";

 	canvas.width = width;

 	canvas.height = height;

 	ctx.textAlign = "center";

 	ctx.textBaseline = "middle";

 	ctx.fillStyle = template.background;

 	ctx.fillRect(0, 0, width, height);

 	ctx.fillStyle = template.foreground;

 	ctx.font = "bold " + text_height + "px " + font;

 	var text = template.text ? template.text : (Math.floor(dimensions.width) + "x" + Math.floor(dimensions.height));

 	if (literal) {

 		var dimensions = holder.dimensions;

 		text = dimensions.width + "x" + dimensions.height;

 	}

 	else if(exact && holder.exact_dimensions){

 		var dimensions = holder.exact_dimensions;

 		text = (Math.floor(dimensions.width) + "x" + Math.floor(dimensions.height));

 	}

 	var text_width = ctx.measureText(text).width;

 	if (text_width / width >= 0.75) {

 		text_height = Math.floor(text_height * 0.75 * (width / text_width));

 	}

 	//Resetting font size if necessary

 	ctx.font = "bold " + (text_height * ratio) + "px " + font;

 	ctx.fillText(text, (width / 2), (height / 2), width);

 	return canvas.toDataURL("image/png");

 }

 function render(mode, el, holder, src) {

 	var dimensions = holder.dimensions,

 		theme = holder.theme,

 		text = holder.text ? decodeURIComponent(holder.text) : holder.text;

 	var dimensions_caption = dimensions.width + "x" + dimensions.height;

 	theme = (text ? extend(theme, {

 		text: text

 	}) : theme);

 	theme = (holder.font ? extend(theme, {

 		font: holder.font

 	}) : theme);

 	el.setAttribute("data-src", src);

 	holder.theme = theme;

 	el.holder_data = holder;

 	if (mode == "image") {

 		el.setAttribute("alt", text ? text : theme.text ? theme.text + " [" + dimensions_caption + "]" : dimensions_caption);

 		if (fallback || !holder.auto) {

 			el.style.width = dimensions.width + "px";

 			el.style.height = dimensions.height + "px";

 		}

 		if (fallback) {

 			el.style.backgroundColor = theme.background;

 		} else {

 			el.setAttribute("src", draw({ctx: ctx, dimensions: dimensions, template: theme, ratio:ratio, holder: holder}));

 			if(holder.textmode && holder.textmode == "exact"){

 				resizable_images.push(el);

 				resizable_update(el);

 			}

 		}

 	} else if (mode == "background") {

 		if (!fallback) {

 			el.style.backgroundImage = "url(" + draw({ctx:ctx, dimensions: dimensions, template: theme, ratio: ratio, holder: holder}) + ")";

 			el.style.backgroundSize = dimensions.width + "px " + dimensions.height + "px";

 		}

 	} else if (mode == "fluid") {

 		el.setAttribute("alt", text ? text : theme.text ? theme.text + " [" + dimensions_caption + "]" : dimensions_caption);

 		if (dimensions.height.slice(-1) == "%") {

 			el.style.height = dimensions.height

 		} else {

 			el.style.height = dimensions.height + "px"

 		}

 		if (dimensions.width.slice(-1) == "%") {

 			el.style.width = dimensions.width

 		} else {

 			el.style.width = dimensions.width + "px"

 		}

 		if (el.style.display == "inline" || el.style.display === "" || el.style.display == "none") {

 			el.style.display = "block";

 		}

 		if (fallback) {

 			el.style.backgroundColor = theme.background;

 		} else {

 			resizable_images.push(el);

 			resizable_update(el);

 		}

 	}

 }

 function dimension_check(el, callback) {

 	var dimensions = {

 		height: el.clientHeight,

 		width: el.clientWidth

 	};

 	if (!dimensions.height && !dimensions.width) {

 		if (el.hasAttribute("data-holder-invisible")) {

 			throw new Error("Holder: placeholder is not visible");

 		} else {

 			el.setAttribute("data-holder-invisible", true)

 			setTimeout(function () {

 				callback.call(this, el)

 			}, 1)

 			return null;

 		}

 	} else {

 		el.removeAttribute("data-holder-invisible")

 	}

 	return dimensions;

 }

 function resizable_update(element) {

 	var images;

 	if (element.nodeType == null) {

 		images = resizable_images;

 	} else {

 		images = [element]

 	}

 	for (var i in images) {

 		if (!images.hasOwnProperty(i)) {

 			continue;

 		}

 		var el = images[i]

 		if (el.holder_data) {

 			var holder = el.holder_data;

 			var dimensions = dimension_check(el, resizable_update)

 			if(dimensions){

 				if(holder.fluid){

 					el.setAttribute("src", draw({

 						ctx: ctx,

 						dimensions: dimensions,

 						template: holder.theme,

 						ratio: ratio,

 						holder: holder

 					}))

 				}

 				if(holder.textmode && holder.textmode == "exact"){

 					holder.exact_dimensions = dimensions;

 					el.setAttribute("src", draw({

 						ctx: ctx,

 						dimensions: holder.dimensions,

 						template: holder.theme,

 						ratio: ratio,

 						holder: holder

 					}))

 				}

 			}

 		}

 	}

 }

 function parse_flags(flags, options) {

 	var ret = {

 		theme: extend(settings.themes.gray, {})

 	};

 	var render = false;

 	for (sl = flags.length, j = 0; j < sl; j++) {

 		var flag = flags[j];

 		if (app.flags.dimensions.match(flag)) {

 			render = true;

 			ret.dimensions = app.flags.dimensions.output(flag);

 		} else if (app.flags.fluid.match(flag)) {

 			render = true;

 			ret.dimensions = app.flags.fluid.output(flag);

 			ret.fluid = true;

 		} else if (app.flags.textmode.match(flag)) {

 			ret.textmode = app.flags.textmode.output(flag)

 		} else if (app.flags.colors.match(flag)) {

 			ret.theme = app.flags.colors.output(flag);

 		} else if (options.themes[flag]) {

 			//If a theme is specified, it will override custom colors

 			if(options.themes.hasOwnProperty(flag)){

 				ret.theme = extend(options.themes[flag], {});

 			}

 		} else if (app.flags.font.match(flag)) {

 			ret.font = app.flags.font.output(flag);

 		} else if (app.flags.auto.match(flag)) {

 			ret.auto = true;

 		} else if (app.flags.text.match(flag)) {

 			ret.text = app.flags.text.output(flag);

 		}

 	}

 	return render ? ret : false;

 }

 for (var flag in app.flags) {

 	if (!app.flags.hasOwnProperty(flag)) continue;

 	app.flags[flag].match = function (val) {

 		return val.match(this.regex)

 	}

 }

 app.add_theme = function (name, theme) {

 	name != null && theme != null && (settings.themes[name] = theme);

 	return app;

 };

 app.add_image = function (src, el) {

 	var node = selector(el);

 	if (node.length) {

 		for (var i = 0, l = node.length; i < l; i++) {

 			var img = document.createElement("img")

 			img.setAttribute("data-src", src);

 			node[i].appendChild(img);

 		}

 	}

 	return app;

 };

 app.run = function (o) {

 	preempted = true;

 	var options = extend(settings, o),

 		images = [],

 		imageNodes = [],

 		bgnodes = [];

 	if (typeof (options.images) == "string") {

 		imageNodes = selector(options.images);

 	} else if (window.NodeList && options.images instanceof window.NodeList) {

 		imageNodes = options.images;

 	} else if (window.Node && options.images instanceof window.Node) {

 		imageNodes = [options.images];

 	}

 	if (typeof (options.bgnodes) == "string") {

 		bgnodes = selector(options.bgnodes);

 	} else if (window.NodeList && options.elements instanceof window.NodeList) {

 		bgnodes = options.bgnodes;

 	} else if (window.Node && options.bgnodes instanceof window.Node) {

 		bgnodes = [options.bgnodes];

 	}

 	for (i = 0, l = imageNodes.length; i < l; i++) images.push(imageNodes[i]);

 	var holdercss = document.getElementById("holderjs-style");

 	if (!holdercss) {

 		holdercss = document.createElement("style");

 		holdercss.setAttribute("id", "holderjs-style");

 		holdercss.type = "text/css";

 		document.getElementsByTagName("head")[0].appendChild(holdercss);

 	}

 	if (!options.nocss) {

 		if (holdercss.styleSheet) {

 			holdercss.styleSheet.cssText += options.stylesheet;

 		} else {

 			holdercss.appendChild(document.createTextNode(options.stylesheet));

 		}

 	}

 	var cssregex = new RegExp(options.domain + "\/(.*?)\"?\\)");

 	for (var l = bgnodes.length, i = 0; i < l; i++) {

 		var src = window.getComputedStyle(bgnodes[i], null)

 			.getPropertyValue("background-image");

 		var flags = src.match(cssregex);

 		var bgsrc = bgnodes[i].getAttribute("data-background-src");

 		if (flags) {

 			var holder = parse_flags(flags[1].split("/"), options);

 			if (holder) {

 				render("background", bgnodes[i], holder, src);

 			}

 		} else if (bgsrc != null) {

 			var holder = parse_flags(bgsrc.substr(bgsrc.lastIndexOf(options.domain) + options.domain.length + 1)

 				.split("/"), options);

 			if (holder) {

 				render("background", bgnodes[i], holder, src);

 			}

 		}

 	}

 	for (l = images.length, i = 0; i < l; i++) {

 		var attr_data_src, attr_src;

 		attr_src = attr_data_src = src = null;

 		try {

 			attr_src = images[i].getAttribute("src");

 			attr_datasrc = images[i].getAttribute("data-src");

 		} catch (e) {}

 		if (attr_datasrc == null && !! attr_src && attr_src.indexOf(options.domain) >= 0) {

 			src = attr_src;

 		} else if ( !! attr_datasrc && attr_datasrc.indexOf(options.domain) >= 0) {

 			src = attr_datasrc;

 		}

 		if (src) {

 			var holder = parse_flags(src.substr(src.lastIndexOf(options.domain) + options.domain.length + 1)

 				.split("/"), options);

 			if (holder) {

 				if (holder.fluid) {

 					render("fluid", images[i], holder, src)

 				} else {

 					render("image", images[i], holder, src);

 				}

 			}

 		}

 	}

 	return app;

 };

 contentLoaded(win, function () {

 	if (window.addEventListener) {

 		window.addEventListener("resize", resizable_update, false);

 		window.addEventListener("orientationchange", resizable_update, false);

 	} else {

 		window.attachEvent("onresize", resizable_update)

 	}

 	preempted || app.run();

 });

 if (typeof define === "function" && define.amd) {

 	define([], function () {

 		return app;

 	});

 }

 })(Holder, window);