abc/assets/js/vendor/background-check.js

/* BackgroundCheck
   http://kennethcachia.com/background-check
   v1.2.2 */

!function(a,b){"function"==typeof define&&define.amd?define(b):a.BackgroundCheck=b(a)}(this,function(){"use strict";function a(a){if(void 0===a||void 0===a.targets)throw"Missing attributes";H.debug=d(a.debug,!1),H.debugOverlay=d(a.debugOverlay,!1),H.targets=g(a.targets),H.images=g(a.images||"img",!0),H.changeParent=d(a.changeParent,!1),H.threshold=d(a.threshold,50),H.minComplexity=d(a.minComplexity,30),H.minOverlap=d(a.minOverlap,50),H.windowEvents=d(a.windowEvents,!0),H.maxDuration=d(a.maxDuration,500),H.mask=d(a.mask,{r:0,g:255,b:0}),H.classes=d(a.classes,{dark:"background--dark",light:"background--light",complex:"background--complex"}),void 0===B&&(h(),B&&(C.style.position="fixed",C.style.top="0px",C.style.left="0px",C.style.width="100%",C.style.height="100%",window.addEventListener(G,x.bind(null,function(){k(),w()})),window.addEventListener("scroll",x.bind(null,w)),k(),w()))}function b(){B=null,C=null,D=null,H={},E&&clearTimeout(E)}function c(a){z("debug")&&console.log(a)}function d(a,b){return e(a,typeof b),void 0===a?b:a}function e(a,b){if(void 0!==a&&typeof a!==b)throw"Incorrect attribute type"}function f(a){for(var b,d,e=[],f=0;f<a.length;f++)if(b=a[f],e.push(b),"IMG"!==b.tagName){if(d=window.getComputedStyle(b).backgroundImage,d.split(/,url|, url/).length>1)throw"Multiple backgrounds are not supported";if(!d||"none"===d)throw"Element is not an <img> but does not have a background-image";e[f]={img:new Image,el:e[f]},d=d.slice(4,-1),d=d.replace(/"/g,""),e[f].img.src=d,c("CSS Image - "+d)}return e}function g(a,b){var c=a;if("string"==typeof a?c=document.querySelectorAll(a):a&&1===a.nodeType&&(c=[a]),!c||0===c.length||void 0===c.length)throw"Elements not found";return b&&(c=f(c)),c=Array.prototype.slice.call(c)}function h(){C=document.createElement("canvas"),C&&C.getContext?(D=C.getContext("2d"),B=!0):B=!1,i()}function i(){z("debugOverlay")?(C.style.opacity=.5,C.style.pointerEvents="none",document.body.appendChild(C)):C.parentNode&&C.parentNode.removeChild(C)}function j(a){var d=(new Date).getTime()-a;c("Duration: "+d+"ms"),d>z("maxDuration")&&(console.log("BackgroundCheck - Killed"),q(),b())}function k(){F={left:0,top:0,right:document.body.clientWidth,bottom:window.innerHeight},C.width=document.body.clientWidth,C.height=window.innerHeight}function l(a,b,c){var d,e;return-1!==a.indexOf("px")?d=parseFloat(a):-1!==a.indexOf("%")?(d=parseFloat(a),e=d/100,d=e*b,c&&(d-=c*e)):d=b,d}function m(a){var b=window.getComputedStyle(a.el);a.el.style.backgroundRepeat="no-repeat",a.el.style.backgroundOrigin="padding-box";var c=b.backgroundSize.split(" "),d=c[0],e=void 0===c[1]?"auto":c[1],f=a.el.clientWidth/a.el.clientHeight,g=a.img.naturalWidth/a.img.naturalHeight;"cover"===d?f>=g?(d="100%",e="auto"):(d="auto",c[0]="auto",e="100%"):"contain"===d&&(1/g>1/f?(d="auto",c[0]="auto",e="100%"):(d="100%",e="auto")),d="auto"===d?a.img.naturalWidth:l(d,a.el.clientWidth),e="auto"===e?d/a.img.naturalWidth*a.img.naturalHeight:l(e,a.el.clientHeight),"auto"===c[0]&&"auto"!==c[1]&&(d=e/a.img.naturalHeight*a.img.naturalWidth);var h=b.backgroundPosition;"top"===h?h="50% 0%":"left"===h?h="0% 50%":"right"===h?h="100% 50%":"bottom"===h?h="50% 100%":"center"===h&&(h="50% 50%"),h=h.split(" ");var i,j;return 4===h.length?(i=h[1],j=h[3]):(i=h[0],j=h[1]),j=j||"50%",i=l(i,a.el.clientWidth,d),j=l(j,a.el.clientHeight,e),4===h.length&&("right"===h[0]&&(i=a.el.clientWidth-a.img.naturalWidth-i),"bottom"===h[2]&&(j=a.el.clientHeight-a.img.naturalHeight-j)),i+=a.el.getBoundingClientRect().left,j+=a.el.getBoundingClientRect().top,{left:Math.floor(i),right:Math.floor(i+d),top:Math.floor(j),bottom:Math.floor(j+e),width:Math.floor(d),height:Math.floor(e)}}function n(a){var b,c,d;if(a.nodeType){var e=a.getBoundingClientRect();b={left:e.left,right:e.right,top:e.top,bottom:e.bottom,width:e.width,height:e.height},d=a.parentNode,c=a}else b=m(a),d=a.el,c=a.img;d=d.getBoundingClientRect(),b.imageTop=0,b.imageLeft=0,b.imageWidth=c.naturalWidth,b.imageHeight=c.naturalHeight;var f,g=b.imageHeight/b.height;return b.top<d.top&&(f=d.top-b.top,b.imageTop=g*f,b.imageHeight-=g*f,b.t