mirror of
https://github.com/niklasvh/html2canvas.git
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7 lines
25 KiB
JavaScript
7 lines
25 KiB
JavaScript
/*
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html2canvas 0.5.0-rc1 <http://html2canvas.hertzen.com>
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Copyright (c) 2014 Niklas von Hertzen
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Released under MIT License
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*/
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(function(t,e,n){function r(){return Math.max(Math.max(e.body.scrollWidth,e.documentElement.scrollWidth),Math.max(e.body.offsetWidth,e.documentElement.offsetWidth),Math.max(e.body.clientWidth,e.documentElement.clientWidth))}function o(){return Math.max(Math.max(e.body.scrollHeight,e.documentElement.scrollHeight),Math.max(e.body.offsetHeight,e.documentElement.offsetHeight),Math.max(e.body.clientHeight,e.documentElement.clientHeight))}function i(e,n,r){var o=e.documentElement.cloneNode(!0),i=e.createElement("iframe");return i.style.display="hidden",i.style.position="absolute",i.style.width=n+"px",i.style.height=r+"px",e.body.appendChild(i),new Promise(function(e){var n=function(){"none"!==i.contentWindow.getComputedStyle(s,null).backgroundImage?(r.body.removeChild(s),r.body.removeChild(a),e(i)):t.setTimeout(n,10)},r=i.contentWindow.document;r.open(),r.write(""),r.close(),r.replaceChild(r.adoptNode(o),r.documentElement);var s=r.createElement("div");s.className="html2canvas-ready-test",r.body.appendChild(s);var a=r.createElement("style");a.innerHTML="body div.html2canvas-ready-test { background-image:url(data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7); }",r.body.appendChild(a),n()})}function s(t,e,n,r,o){this.renderer=e,this.options=o,this.range=null,this.support=n,this.stack=new W(!0,1,t.ownerDocument,null);var i=new P(t,null);i.visibile=i.isElementVisible(),this.nodes=[i].concat(this.getChildren(i)).filter(function(t){return t.visible=t.isElementVisible()}),this.images=r.fetch(this.nodes.filter(C)),this.createStackingContexts(),this.sortStackingContexts(this.stack),this.images.ready.then(N(function(){_("Images loaded, starting parsing"),this.parse(this.stack),o.onrendered(e.canvas)},this))}function a(t){return 0>t.cssInt("zIndex")}function c(t){return t.cssInt("zIndex")>0}function u(t){return 0===t.cssInt("zIndex")}function h(t){return-1!==["inline","inline-block","inline-table"].indexOf(t.css("display"))}function p(t){return t instanceof W}function l(t){return t.node.data.trim().length>0}function d(t){return/^(normal|none|0px)$/.test(t.parent.css("letterSpacing"))}function f(t,e,n,r,o,i,s){e[0]>0||e[1]>0?(t.push(["line",r[0].start.x,r[0].start.y]),r[0].curveTo(t),r[1].curveTo(t)):t.push(["line",i,s]),(n[0]>0||n[1]>0)&&t.push(["line",o[0].start.x,o[0].start.y])}function g(t){return["TopLeft","TopRight","BottomRight","BottomLeft"].map(function(e){var n=t.css("border"+e+"Radius"),r=n.split(" ");return 1>=r.length&&(r[1]=r[0]),r.map(m)})}function m(t){return parseInt(t,10)}function y(t,e,n,r){var o=4*((Math.sqrt(2)-1)/3),i=n*o,s=r*o,a=t+n,c=e+r;return{topLeft:v({x:t,y:c},{x:t,y:c-s},{x:a-i,y:e},{x:a,y:e}),topRight:v({x:t,y:e},{x:t+i,y:e},{x:a,y:c-s},{x:a,y:c}),bottomRight:v({x:a,y:e},{x:a,y:e+s},{x:t+i,y:c},{x:t,y:c}),bottomLeft:v({x:a,y:c},{x:a-i,y:c},{x:t,y:e+s},{x:t,y:e})}}function b(t,e,n){var r=t.left,o=t.top,i=t.width,s=t.height,a=e[0][0],c=e[0][1],u=e[1][0],h=e[1][1],p=e[2][0],l=e[2][1],d=e[3][0],f=e[3][1],g=i-u,m=s-l,b=i-p,v=s-f;return{topLeftOuter:y(r,o,a,c).topLeft.subdivide(.5),topLeftInner:y(r+n[3].width,o+n[0].width,Math.max(0,a-n[3].width),Math.max(0,c-n[0].width)).topLeft.subdivide(.5),topRightOuter:y(r+g,o,u,h).topRight.subdivide(.5),topRightInner:y(r+Math.min(g,i+n[3].width),o+n[0].width,g>i+n[3].width?0:u-n[3].width,h-n[0].width).topRight.subdivide(.5),bottomRightOuter:y(r+b,o+m,p,l).bottomRight.subdivide(.5),bottomRightInner:y(r+Math.min(b,i+n[3].width),o+Math.min(m,s+n[0].width),Math.max(0,p-n[1].width),Math.max(0,l-n[2].width)).bottomRight.subdivide(.5),bottomLeftOuter:y(r,o+v,d,f).bottomLeft.subdivide(.5),bottomLeftInner:y(r+n[3].width,o+v,Math.max(0,d-n[3].width),Math.max(0,f-n[2].width)).bottomLeft.subdivide(.5)}}function v(t,e,n,r){var o=function(t,e,n){return{x:t.x+(e.x-t.x)*n,y:t.y+(e.y-t.y)*n}};return{start:t,startControl:e,endControl:n,end:r,subdivide:function(i){var s=o(t,e,i),a=o(e,n,i),c=o(n,r,i),u=o(s,a,i),h=o(a,c,i),p=o(u,h,i);return[v(t,s,u,p),v(p,h,c,r)]},curveTo:function(t){t.push(["bezierCurve",e.x,e.y,n.x,n.y,r.x,r.y])},curveToReversed:function(r){r.push(["bezierCurve",n.x,n.y,e.x,e.y,t.x,t.y])}}}function w(t,e,n,r,o,i,s){var a=[];return e[0]>0||e[1]>0?(a.push(["line",r[1].start.x,r[1].start.y]),r[1].curveTo(a)):a.push(["line",t.c1[0],t.c1[1]]),n[0]>0||n[1]>0?(a.push(["line",i[0].start.x,i[0].start.y]),i[0].curveTo(a),a.push(["line",s[0].end.x,s[0].end.y]),s[0].curveToReversed(a)):(a.push(["line",t.c2[0],t.c2[1]]),a.push(["line",t.c3[0],t.c3[1]])),e[0]>0||e[1]>0?(a.push(["line",o[1].end.x,o[1].end.y]),o[1].curveToReversed(a)):a.push(["line",t.c4[0],t.c4[1]]),a}function x(t){return t.node.nodeType!==Node.ELEMENT_NODE||-1===["SCRIPT","HEAD","TITLE","OBJECT","BR"].indexOf(t.node.nodeName)}function k(t){return[].concat.apply([],t)}function E(t){return t.nodeType===Node.TEXT_NODE||t.nodeType===Node.ELEMENT_NODE}function R(t){var e=t.css("position"),n="absolute"===e||"relative"===e?t.css("zIndex"):"auto";return"auto"!==n}function I(t){return"static"!==t.css("position")}function T(t){return"none"!==t.css("float")}function B(t){var e=this;return function(){return!t.apply(e,arguments)}}function C(t){return t.node.nodeType===Node.ELEMENT_NODE}function O(t){return t.node.nodeType===Node.TEXT_NODE}function S(t,e){return t.cssInt("zIndex")-e.cssInt("zIndex")}function L(t){return 1>t.css("opacity")}function N(t,e){return function(){return t.apply(e,arguments)}}function A(t,e){this.src=t,this.image=new Image;var n=this.image;this.promise=new Promise(function(r,o){n.onload=r,n.onerror=o,e&&(n.crossOrigin="anonymous"),n.src=t})}function M(e,n){this.link=null,this.options=e,this.support=n,this.origin=t.location.protocol+t.location.host}function _(){t.html2canvas.logging&&t.console&&t.console.log&&t.console.log.apply(t.console,[Date.now()-t.html2canvas.start+"ms","html2canvas:"].concat([].slice.call(arguments,0)))}function P(t,e){this.node=t,this.parent=e,this.stack=null,this.bounds=null,this.visible=null,this.computedStyles=null,this.styles={},this.backgroundImages=null}function D(t){return-1!==(""+t).indexOf("%")}function j(t,e,n){this.width=t,this.height=e,this.images=n}function F(t,n){j.apply(this,arguments),this.canvas=e.createElement("canvas"),this.canvas.width=t,this.canvas.height=n,this.ctx=this.canvas.getContext("2d"),this.ctx.textBaseline="bottom"}function W(t,e,n,r){P.call(this,n,r),this.ownStacking=t,this.contexts=[],this.children=[],this.opacity=(this.parent?this.parent.stack.opacity:1)*e}function z(){this.rangeBounds=this.testRangeBounds(),this.cors=this.testCORS()}function H(t,e){P.call(this,t,e)}function V(t,e,r){return t.length>0?e+r.toUpperCase():n}t.html2canvas=function(a,c){c=c||{},c.logging&&(t.html2canvas.logging=!0,t.html2canvas.start=Date.now()),i(e,t.innerWidth,t.innerHeight).then(function(i){_("Document cloned");var u=i.contentWindow;a===n?e.body:a[0];var h=u.document.documentElement,p=new z,l=new M(c,p),d=new F(r(),o(),l),f=new s(h,d,p,l,c);t.console.log(f)})},s.prototype.getChildren=function(t){return k([].filter.call(t.node.childNodes,E).map(function(e){var n=[e.nodeType===Node.TEXT_NODE?new H(e,t):new P(e,t)].filter(x);return e.nodeType===Node.ELEMENT_NODE&&n.length?n[0].isElementVisible()?n.concat(this.getChildren(n[0])):[]:n},this))},s.prototype.newStackingContext=function(t,e){var n=new W(e,t.cssFloat("opacity"),t.node,t.parent);n.visible=t.visible;var r=n.getParentStack(this);r.contexts.push(n),t.stack=n},s.prototype.createStackingContexts=function(){this.nodes.forEach(function(t){C(t)&&(this.isRootElement(t)||L(t)||R(t)||this.isBodyWithTransparentRoot(t))?this.newStackingContext(t,!0):C(t)&&I(t)?this.newStackingContext(t,!1):t.assignStack(t.parent.stack)},this)},s.prototype.isBodyWithTransparentRoot=function(t){return"BODY"===t.node.nodeName&&this.renderer.isTransparent(t.parent.css("backgroundColor"))},s.prototype.isRootElement=function(t){return"HTML"===t.node.nodeName},s.prototype.sortStackingContexts=function(t){t.contexts.sort(S),t.contexts.forEach(this.sortStackingContexts,this)},s.prototype.parseBounds=function(t){return t.bounds=this.getBounds(t.node)},s.prototype.getBounds=function(t){if(t.getBoundingClientRect){var e=t.getBoundingClientRect();return{top:e.top,bottom:e.bottom||e.top+e.height,left:e.left,width:t.offsetWidth,height:t.offsetHeight}}return{}},s.prototype.parseTextBounds=function(t){return function(e,n,r){if("none"!==t.parent.css("textDecoration")||0!==e.trim().length){var o=r.slice(0,n).join("").length;if(this.support.rangeBounds)return this.getRangeBounds(t.node,o,e.length);if(t.node&&"string"==typeof t.node.data){var i=t.node.splitText(e.length),s=this.getWrapperBounds(t.node);return t.node=i,s}}}},s.prototype.getWrapperBounds=function(t){var e=t.ownerDocument.createElement("wrapper"),n=t.parentNode,r=t.cloneNode(!0);e.appendChild(t.cloneNode(!0)),n.replaceChild(e,t);var o=this.getBounds(e);return n.replaceChild(r,e),o},s.prototype.getRangeBounds=function(t,e,n){var r=this.range||(this.range=t.ownerDocument.createRange());return r.setStart(t,e),r.setEnd(t,e+n),r.getBoundingClientRect()},s.prototype.parse=function(t){var e=t.contexts.filter(a),n=t.children.filter(C),r=n.filter(B(T)),o=r.filter(B(I)).filter(B(h)),i=n.filter(B(I)).filter(T),s=r.filter(B(I)).filter(h),d=t.contexts.concat(r.filter(I)).filter(u),f=t.children.filter(O).filter(l),g=t.contexts.filter(c),m=[];e.concat(o).concat(i).concat(s).concat(d).concat(f).concat(g).forEach(function(t){if(this.paint(t),-1!==m.indexOf(t.node))throw _(t,t.node),Error("rendering twice");m.push(t.node),p(t)&&this.parse(t)},this)},s.prototype.paint=function(t){O(t)?this.paintText(t):this.paintNode(t)},s.prototype.paintNode=function(t){p(t)&&this.renderer.setOpacity(t.opacity);var e=this.parseBounds(t),n=this.parseBorders(t);this.renderer.clip(n.clip,function(){this.renderer.renderBackground(t,e)},this),this.renderer.renderBorders(n.borders)},s.prototype.paintText=function(t){t.applyTextTransform();var e=t.node.data.split(!this.options.letterRendering||d(t)?/(\b| )/:""),n=t.parent.fontWeight(),r=t.parent.css("fontSize"),o=t.parent.css("fontFamily");this.renderer.font(t.parent.css("color"),t.parent.css("fontStyle"),t.parent.css("fontVariant"),n,r,o),e.map(this.parseTextBounds(t),this).forEach(function(t,n){t&&this.renderer.text(e[n],t.left,t.bottom)},this)},s.prototype.parseBorders=function(t){var e=t.bounds,n=g(t),r=["Top","Right","Bottom","Left"].map(function(e){return{width:t.cssInt("border"+e+"Width"),color:t.css("border"+e+"Color"),args:null}}),o=b(e,n,r);return{clip:this.parseBackgroundClip(t,o,r,n,e),borders:r.map(function(t,i){if(t.width>0){var s=e.left,a=e.top,c=e.width,u=e.height-r[2].width;switch(i){case 0:u=r[0].width,t.args=w({c1:[s,a],c2:[s+c,a],c3:[s+c-r[1].width,a+u],c4:[s+r[3].width,a+u]},n[0],n[1],o.topLeftOuter,o.topLeftInner,o.topRightOuter,o.topRightInner);break;case 1:s=e.left+e.width-r[1].width,c=r[1].width,t.args=w({c1:[s+c,a],c2:[s+c,a+u+r[2].width],c3:[s,a+u],c4:[s,a+r[0].width]},n[1],n[2],o.topRightOuter,o.topRightInner,o.bottomRightOuter,o.bottomRightInner);break;case 2:a=a+e.height-r[2].width,u=r[2].width,t.args=w({c1:[s+c,a+u],c2:[s,a+u],c3:[s+r[3].width,a],c4:[s+c-r[3].width,a]},n[2],n[3],o.bottomRightOuter,o.bottomRightInner,o.bottomLeftOuter,o.bottomLeftInner);break;case 3:c=r[3].width,t.args=w({c1:[s,a+u+r[2].width],c2:[s,a],c3:[s+c,a+r[0].width],c4:[s+c,a+u]},n[3],n[0],o.bottomLeftOuter,o.bottomLeftInner,o.topLeftOuter,o.topLeftInner)}}return t})}},s.prototype.parseBackgroundClip=function(t,e,n,r,o){var i=t.css("backgroundClip"),s=[];switch(i){case"content-box":case"padding-box":f(s,r[0],r[1],e.topLeftInner,e.topRightInner,o.left+n[3].width,o.top+n[0].width),f(s,r[1],r[2],e.topRightInner,e.bottomRightInner,o.left+o.width-n[1].width,o.top+n[0].width),f(s,r[2],r[3],e.bottomRightInner,e.bottomLeftInner,o.left+o.width-n[1].width,o.top+o.height-n[2].width),f(s,r[3],r[0],e.bottomLeftInner,e.topLeftInner,o.left+n[3].width,o.top+o.height-n[2].width);break;default:f(s,r[0],r[1],e.topLeftOuter,e.topRightOuter,o.left,o.top),f(s,r[1],r[2],e.topRightOuter,e.bottomRightOuter,o.left+o.width,o.top),f(s,r[2],r[3],e.bottomRightOuter,e.bottomLeftOuter,o.left+o.width,o.top+o.height),f(s,r[3],r[0],e.bottomLeftOuter,e.topLeftOuter,o.left,o.top+o.height)}return s},M.prototype.findImages=function(t,e){var n=e.parseBackgroundImages(),r=n.filter(this.isImageBackground).map(this.getBackgroundUrl).filter(this.imageExists(t)).map(this.loadImage,this);return t.concat(r)},M.prototype.getBackgroundUrl=function(t){return t.args[0]},M.prototype.isImageBackground=function(t){return"url"===t.method},M.prototype.loadImage=function(t){return t.match(/data:image\/.*;base64,/i)?new A(t.replace(/url\(['"]{0,}|['"]{0,}\)$/gi,""),!1):this.isSameOrigin(t)||this.options.allowTaint===!0?new A(t,!1):this.support.cors&&!this.options.allowTaint&&this.options.useCORS?new A(t,!0):this.options.proxy?new ProxyImageContainer(t):new DummyImageContainer(t)},M.prototype.imageExists=function(t){return function(e){return!t.some(function(t){return t.src!==e.src})}},M.prototype.isSameOrigin=function(t){var n=this.link||(this.link=e.createElement("a"));n.href=t,n.href=n.href;var r=n.protocol+n.host;return r===this.origin},M.prototype.getPromise=function(t){return t.promise},M.prototype.get=function(t){var e=null;return this.images.some(function(n){return(e=n).src===t})?e:null},M.prototype.fetch=function(t){return this.images=t.reduce(N(this.findImages,this),[]),this.ready=Promise.all(this.images.map(this.getPromise)),this},P.prototype.assignStack=function(t){this.stack=t,t.children.push(this)},P.prototype.isElementVisible=function(){return this.node.nodeType===Node.TEXT_NODE?this.parent.visible:"none"!==this.css("display")&&"hidden"!==this.css("visibility")&&!this.node.hasAttribute("data-html2canvas-ignore")},P.prototype.css=function(t){return this.computedStyles||(this.computedStyles=this.node.ownerDocument.defaultView.getComputedStyle(this.node,null)),this.styles[t]||(this.styles[t]=this.computedStyles[t])},P.prototype.cssInt=function(t){var e=parseInt(this.css(t),10);return Number.isNaN(e)?0:e},P.prototype.cssFloat=function(t){var e=parseFloat(this.css(t));return Number.isNaN(e)?0:e},P.prototype.fontWeight=function(){var t=this.css("fontWeight");switch(parseInt(t,10)){case 401:t="bold";break;case 400:t="normal"}return t},P.prototype.parseBackgroundImages=function(){var t,e,r,o,i,s,a,c=" \r\n ",u=[],h=0,p=0,l=function(){t&&('"'===e.substr(0,1)&&(e=e.substr(1,e.length-2)),e&&a.push(e),"-"===t.substr(0,1)&&(o=t.indexOf("-",1)+1)>0&&(r=t.substr(0,o),t=t.substr(o)),u.push({prefix:r,method:t.toLowerCase(),value:i,args:a,image:null})),a=[],t=r=e=i=""};return a=[],t=r=e=i="",this.css("backgroundImage").split("").forEach(function(r){if(!(0===h&&c.indexOf(r)>-1)){switch(r){case'"':s?s===r&&(s=null):s=r;break;case"(":if(s)break;if(0===h)return h=1,i+=r,n;p++;break;case")":if(s)break;if(1===h){if(0===p)return h=0,i+=r,l(),n;p--}break;case",":if(s)break;if(0===h)return l(),n;if(1===h&&0===p&&!t.match(/^url$/i))return a.push(e),e="",i+=r,n}i+=r,0===h?t+=r:e+=r}}),l(),this.backgroundImages||(this.backgroundImages=u)},P.prototype.cssList=function(t,e){var n=(this.css(t)||"").split(",");return n=n[e||0]||n[0]||"auto",n=n.trim().split(" "),1===n.length&&(n=[n[0],n[0]]),n},P.prototype.parseBackgroundSize=function(t,e,n){var r,o,i=this.cssList("backgroundSize",n);if(D(i[0]))r=t.width*parseFloat(i[0])/100;else{if(/contain|cover/.test(i[0])){var s=t.width/t.height,a=e.width/e.height;return a>s^"contain"===i[0]?{width:t.height*a,height:t.height}:{width:t.width,height:t.width/a}}r=parseInt(i[0],10)}return o="auto"===i[0]&&"auto"===i[1]?e.height:"auto"===i[1]?r/e.width*e.height:D(i[1])?t.height*parseFloat(i[1])/100:parseInt(i[1],10),"auto"===i[0]&&(r=o/e.height*e.width),{width:r,height:o}},P.prototype.parseBackgroundPosition=function(t,e,n,r){var o,i,s=this.cssList("backgroundPosition",n);return o=D(s[0])?(t.width-(r||e).width)*(parseFloat(s[0])/100):parseInt(s[0],10),i="auto"===s[1]?o/e.width*e.height:D(s[1])?(t.height-(r||e).height)*parseFloat(s[1])/100:parseInt(s[1],10),"auto"===s[0]&&(o=i/e.height*e.width),{left:o,top:i}},P.prototype.parseBackgroundRepeat=function(t){return this.cssList("backgroundRepeat",t)[0]},!function(){var r,o,i,s;!function(){var 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