mirror of
https://github.com/niklasvh/html2canvas.git
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7 lines
26 KiB
JavaScript
7 lines
26 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){function n(){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 i(){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 o(e,n,i){var o=e.documentElement.cloneNode(!0),r=e.createElement("iframe");return r.style.display="hidden",r.style.position="absolute",r.width=n,r.height=i,r.scrolling="no",e.body.appendChild(r),new Promise(function(e){var n=function(){"none"!==r.contentWindow.getComputedStyle(s,null).backgroundImage?(i.body.removeChild(s),i.body.removeChild(a),e(r)):t.setTimeout(n,10)},i=r.contentWindow.document;i.open(),i.write(""),i.close(),i.replaceChild(i.adoptNode(o),i.documentElement),r.contentWindow.scrollTo(t.scrollX,t.scrollY);var s=i.createElement("div");s.className="html2canvas-ready-test",i.body.appendChild(s);var a=i.createElement("style");a.innerHTML="body div.html2canvas-ready-test { background-image:url(data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7); }",i.body.appendChild(a),t.setTimeout(n,1e3)})}function r(t,e){this.src=t,this.image=new Image;var n=this.image;this.promise=new Promise(function(i,o){n.onload=i,n.onerror=o,e&&(n.crossOrigin="anonymous"),n.src=t,n.complete===!0&&i(n)})}function s(e,n){this.link=null,this.options=e,this.support=n,this.origin=t.location.protocol+t.location.host}function a(t){return"IMG"===t.node.nodeName}function c(t){return t.node.src}function u(){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 h(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 p(t){return-1!==(""+t).indexOf("%")}function d(t,e,n,i,o){u("Starting NodeParser"),this.renderer=e,this.options=o,this.range=null,this.support=n,this.stack=new z(!0,1,t.ownerDocument,null);var r=new h(t,null);r.visibile=r.isElementVisible(),this.nodes=[r].concat(this.getChildren(r)).filter(function(t){return t.visible=t.isElementVisible()}),u("Fetched nodes"),this.images=i.fetch(this.nodes.filter(L)),u("Creating stacking contexts"),this.createStackingContexts(),u("Sorting stacking contexts"),this.sortStackingContexts(this.stack),this.images.ready.then(P(function(){u("Images loaded, starting parsing"),this.parse(this.stack),u("Finished rendering"),o.onrendered(e.canvas)},this))}function l(t,e,n,i){var o=4*((Math.sqrt(2)-1)/3),r=n*o,s=i*o,a=t+n,c=e+i;return{topLeft:g({x:t,y:c},{x:t,y:c-s},{x:a-r,y:e},{x:a,y:e}),topRight:g({x:t,y:e},{x:t+r,y:e},{x:a,y:c-s},{x:a,y:c}),bottomRight:g({x:a,y:e},{x:a,y:e+s},{x:t+r,y:c},{x:t,y:c}),bottomLeft:g({x:a,y:c},{x:a-r,y:c},{x:t,y:e+s},{x:t,y:e})}}function f(t,e,n){var i=t.left,o=t.top,r=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],d=e[2][1],f=e[3][0],g=e[3][1],m=r-u,y=s-d,w=r-p,v=s-g;return{topLeftOuter:l(i,o,a,c).topLeft.subdivide(.5),topLeftInner:l(i+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:l(i+m,o,u,h).topRight.subdivide(.5),topRightInner:l(i+Math.min(m,r+n[3].width),o+n[0].width,m>r+n[3].width?0:u-n[3].width,h-n[0].width).topRight.subdivide(.5),bottomRightOuter:l(i+w,o+y,p,d).bottomRight.subdivide(.5),bottomRightInner:l(i+Math.min(w,r+n[3].width),o+Math.min(y,s+n[0].width),Math.max(0,p-n[1].width),Math.max(0,d-n[2].width)).bottomRight.subdivide(.5),bottomLeftOuter:l(i,o+v,f,g).bottomLeft.subdivide(.5),bottomLeftInner:l(i+n[3].width,o+v,Math.max(0,f-n[3].width),Math.max(0,g-n[2].width)).bottomLeft.subdivide(.5)}}function g(t,e,n,i){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:i,subdivide:function(r){var s=o(t,e,r),a=o(e,n,r),c=o(n,i,r),u=o(s,a,r),h=o(a,c,r),p=o(u,h,r);return[g(t,s,u,p),g(p,h,c,i)]},curveTo:function(t){t.push(["bezierCurve",e.x,e.y,n.x,n.y,i.x,i.y])},curveToReversed:function(i){i.push(["bezierCurve",n.x,n.y,e.x,e.y,t.x,t.y])}}}function m(t,e,n,i,o,r,s){var a=[];return e[0]>0||e[1]>0?(a.push(["line",i[1].start.x,i[1].start.y]),i[1].curveTo(a)):a.push(["line",t.c1[0],t.c1[1]]),n[0]>0||n[1]>0?(a.push(["line",r[0].start.x,r[0].start.y]),r[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 y(t,e,n,i,o,r,s){e[0]>0||e[1]>0?(t.push(["line",i[0].start.x,i[0].start.y]),i[0].curveTo(t),i[1].curveTo(t)):t.push(["line",r,s]),(n[0]>0||n[1]>0)&&t.push(["line",o[0].start.x,o[0].start.y])}function w(t){return 0>t.cssInt("zIndex")}function v(t){return t.cssInt("zIndex")>0}function b(t){return 0===t.cssInt("zIndex")}function x(t){return-1!==["inline","inline-block","inline-table"].indexOf(t.css("display"))}function k(t){return t instanceof z}function I(t){return t.node.data.trim().length>0}function E(t){return/^(normal|none|0px)$/.test(t.parent.css("letterSpacing"))}function R(t){return["TopLeft","TopRight","BottomRight","BottomLeft"].map(function(e){var n=t.css("border"+e+"Radius"),i=n.split(" ");return 1>=i.length&&(i[1]=i[0]),i.map(_)})}function T(t){return t.nodeType===Node.TEXT_NODE||t.nodeType===Node.ELEMENT_NODE}function B(t){var e=t.css("position"),n="absolute"===e||"relative"===e?t.css("zIndex"):"auto";return"auto"!==n}function C(t){return"static"!==t.css("position")}function O(t){return"none"!==t.css("float")}function S(t){var e=this;return function(){return!t.apply(e,arguments)}}function L(t){return t.node.nodeType===Node.ELEMENT_NODE}function N(t){return t.node.nodeType===Node.TEXT_NODE}function M(t,e){return t.cssInt("zIndex")-e.cssInt("zIndex")}function A(t){return 1>t.css("opacity")}function P(t,e){return function(){return t.apply(e,arguments)}}function _(t){return parseInt(t,10)}function D(t){return t.node.nodeType!==Node.ELEMENT_NODE||-1===["SCRIPT","HEAD","TITLE","OBJECT","BR"].indexOf(t.node.nodeName)}function F(t){return[].concat.apply([],t)}function W(t,e,n){this.width=t,this.height=e,this.images=n}function j(t,n){W.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",u("Initialized CanvasRenderer")}function z(t,e,n,i){h.call(this,n,i),this.ownStacking=t,this.contexts=[],this.children=[],this.opacity=(this.parent?this.parent.stack.opacity:1)*e}function H(){this.rangeBounds=this.testRangeBounds(),this.cors=this.testCORS()}function V(t,e){h.call(this,t,e)}function Y(t,e,n){return t.length>0?e+n.toUpperCase():undefined}t.html2canvas=function(r,a){a=a||{},a.logging&&(t.html2canvas.logging=!0,t.html2canvas.start=Date.now()),o(e,t.innerWidth,t.innerHeight).then(function(e){u("Document cloned");var o=e.contentWindow,r=o.document.documentElement,c=new H,h=new s(a,c),p=d.prototype.getBounds(r),l="view"===a.type?Math.min(p.width,t.innerWidth):n(),f="view"===a.type?Math.min(p.height,t.innerHeight):i(),g=new j(l,f,h),m=new d(r,g,c,h,a);t.console.log(m)})},s.prototype.findImages=function(t){var e=[];return t.filter(a).map(c).forEach(this.addImage(e,this.loadImage),this),e},s.prototype.findBackgroundImage=function(t,e){return e.parseBackgroundImages().filter(this.isImageBackground).map(this.getBackgroundUrl).forEach(this.addImage(t,this.loadImage),this),t},s.prototype.addImage=function(t,e){return function(n){this.imageExists(t,n)||(t.splice(0,0,e.apply(this,arguments)),u("Added image #"+t.length,n.substring(0,100)))}},s.prototype.getBackgroundUrl=function(t){return t.args[0]},s.prototype.isImageBackground=function(t){return"url"===t.method},s.prototype.loadImage=function(t){return t.match(/data:image\/.*;base64,/i)?new r(t.replace(/url\(['"]{0,}|['"]{0,}\)$/gi,""),!1):this.isSameOrigin(t)||this.options.allowTaint===!0?new r(t,!1):this.support.cors&&!this.options.allowTaint&&this.options.useCORS?new r(t,!0):this.options.proxy?new ProxyImageContainer(t):new DummyImageContainer(t)},s.prototype.imageExists=function(t,e){return t.some(function(t){return t.src===e})},s.prototype.isSameOrigin=function(t){var n=this.link||(this.link=e.createElement("a"));n.href=t,n.href=n.href;var i=n.protocol+n.host;return i===this.origin},s.prototype.getPromise=function(t){return t.promise},s.prototype.get=function(t){var e=null;return this.images.some(function(n){return(e=n).src===t})?e:null},s.prototype.fetch=function(t){return this.images=t.reduce(P(this.findBackgroundImage,this),this.findImages(t)),this.images.forEach(function(t,e){t.promise.then(function(){u("Succesfully loaded image #"+(e+1))},function(){u("Failed loading image #"+(e+1))})}),this.ready=Promise.all(this.images.map(this.getPromise)),u("Finished searching images"),this},h.prototype.assignStack=function(t){this.stack=t,t.children.push(this)},h.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")},h.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])},h.prototype.cssInt=function(t){var e=parseInt(this.css(t),10);return isNaN(e)?0:e},h.prototype.cssFloat=function(t){var e=parseFloat(this.css(t));return isNaN(e)?0:e},h.prototype.fontWeight=function(){var t=this.css("fontWeight");switch(parseInt(t,10)){case 401:t="bold";break;case 400:t="normal"}return t},h.prototype.parseBackgroundImages=function(){var t,e,n,i,o,r,s,a=" \r\n ",c=[],u=0,h=0,p=function(){t&&('"'===e.substr(0,1)&&(e=e.substr(1,e.length-2)),e&&s.push(e),"-"===t.substr(0,1)&&(i=t.indexOf("-",1)+1)>0&&(n=t.substr(0,i),t=t.substr(i)),c.push({prefix:n,method:t.toLowerCase(),value:o,args:s,image:null})),s=[],t=n=e=o=""};return s=[],t=n=e=o="",this.css("backgroundImage").split("").forEach(function(n){if(!(0===u&&a.indexOf(n)>-1)){switch(n){case'"':r?r===n&&(r=null):r=n;break;case"(":if(r)break;if(0===u)return u=1,o+=n,undefined;h++;break;case")":if(r)break;if(1===u){if(0===h)return u=0,o+=n,p(),undefined;h--}break;case",":if(r)break;if(0===u)return p(),undefined;if(1===u&&0===h&&!t.match(/^url$/i))return s.push(e),e="",o+=n,undefined}o+=n,0===u?t+=n:e+=n}}),p(),this.backgroundImages||(this.backgroundImages=c)},h.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},h.prototype.parseBackgroundSize=function(t,e,n){var i,o,r=this.cssList("backgroundSize",n);if(p(r[0]))i=t.width*parseFloat(r[0])/100;else{if(/contain|cover/.test(r[0])){var s=t.width/t.height,a=e.width/e.height;return a>s^"contain"===r[0]?{width:t.height*a,height:t.height}:{width:t.width,height:t.width/a}}i=parseInt(r[0],10)}return o="auto"===r[0]&&"auto"===r[1]?e.height:"auto"===r[1]?i/e.width*e.height:p(r[1])?t.height*parseFloat(r[1])/100:parseInt(r[1],10),"auto"===r[0]&&(i=o/e.height*e.width),{width:i,height:o}},h.prototype.parseBackgroundPosition=function(t,e,n,i){var o,r,s=this.cssList("backgroundPosition",n);return o=p(s[0])?(t.width-(i||e).width)*(parseFloat(s[0])/100):parseInt(s[0],10),r="auto"===s[1]?o/e.width*e.height:p(s[1])?(t.height-(i||e).height)*parseFloat(s[1])/100:parseInt(s[1],10),"auto"===s[0]&&(o=r/e.height*e.width),{left:o,top:r}},h.prototype.parseBackgroundRepeat=function(t){return this.cssList("backgroundRepeat",t)[0]},d.prototype.getChildren=function(t){return F([].filter.call(t.node.childNodes,T).map(function(e){var n=[e.nodeType===Node.TEXT_NODE?new V(e,t):new h(e,t)].filter(D);return e.nodeType===Node.ELEMENT_NODE&&n.length?n[0].isElementVisible()?n.concat(this.getChildren(n[0])):[]:n},this))},d.prototype.newStackingContext=function(t,e){var n=new z(e,t.cssFloat("opacity"),t.node,t.parent);n.visible=t.visible;var i=n.getParentStack(this);i.contexts.push(n),t.stack=n},d.prototype.createStackingContexts=function(){this.nodes.forEach(function(t){L(t)&&(this.isRootElement(t)||A(t)||B(t)||this.isBodyWithTransparentRoot(t))?this.newStackingContext(t,!0):L(t)&&C(t)?this.newStackingContext(t,!1):t.assignStack(t.parent.stack)},this)},d.prototype.isBodyWithTransparentRoot=function(t){return"BODY"===t.node.nodeName&&this.renderer.isTransparent(t.parent.css("backgroundColor"))},d.prototype.isRootElement=function(t){return"HTML"===t.node.nodeName},d.prototype.sortStackingContexts=function(t){t.contexts.sort(M),t.contexts.forEach(this.sortStackingContexts,this)},d.prototype.parseBounds=function(t){return t.bounds=this.getBounds(t.node)},d.prototype.getBounds=function(t){if(t.getBoundingClientRect){var e=t.getBoundingClientRect(),n="BODY"===t.nodeName;return{top:e.top,bottom:e.bottom||e.top+e.height,left:e.left,width:n?t.scrollWidth:t.offsetWidth,height:n?t.scrollHeight:t.offsetHeight}}return{}},d.prototype.parseTextBounds=function(t){return function(e,n,i){if("none"!==t.parent.css("textDecoration")||0!==e.trim().length){var o=i.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 r=t.node.splitText(e.length),s=this.getWrapperBounds(t.node);return t.node=r,s}}}},d.prototype.getWrapperBounds=function(t){var e=t.ownerDocument.createElement("wrapper"),n=t.parentNode,i=t.cloneNode(!0);e.appendChild(t.cloneNode(!0)),n.replaceChild(e,t);var o=this.getBounds(e);return n.replaceChild(i,e),o},d.prototype.getRangeBounds=function(t,e,n){var i=this.range||(this.range=t.ownerDocument.createRange());return i.setStart(t,e),i.setEnd(t,e+n),i.getBoundingClientRect()},d.prototype.parse=function(t){var e=t.contexts.filter(w),n=t.children.filter(L),i=n.filter(S(O)),o=i.filter(S(C)).filter(S(x)),r=n.filter(S(C)).filter(O),s=i.filter(S(C)).filter(x),a=t.contexts.concat(i.filter(C)).filter(b),c=t.children.filter(N).filter(I),h=t.contexts.filter(v),p=[];e.concat(o).concat(r).concat(s).concat(a).concat(c).concat(h).forEach(function(t){if(this.paint(t),-1!==p.indexOf(t.node))throw u(t,t.node),Error("rendering twice");p.push(t.node),k(t)&&this.parse(t)},this)},d.prototype.paint=function(t){try{N(t)?this.paintText(t):this.paintNode(t)}catch(e){u(e)}},d.prototype.paintNode=function(t){k(t)&&this.renderer.setOpacity(t.opacity);var e=this.parseBounds(t),n=this.parseBorders(t);switch(this.renderer.clip(n.clip,function(){this.renderer.renderBackground(t,e)},this),this.renderer.renderBorders(n.borders),t.node.nodeName){case"IMG":var i=this.images.get(t.node.src);i?this.renderer.renderImage(t,e,n,i.image):u("Error loading <img>",t.node.src)}},d.prototype.paintText=function(t){t.applyTextTransform();var e=t.node.data.split(!this.options.letterRendering||E(t)?/(\b| )/:""),n=t.parent.fontWeight(),i=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,i,o),e.map(this.parseTextBounds(t),this).forEach(function(t,n){t&&this.renderer.text(e[n],t.left,t.bottom)},this)},d.prototype.parseBorders=function(t){var e=t.bounds,n=R(t),i=["Top","Right","Bottom","Left"].map(function(e){return{width:t.cssInt("border"+e+"Width"),color:t.css("border"+e+"Color"),args:null}}),o=f(e,n,i);return{clip:this.parseBackgroundClip(t,o,i,n,e),borders:i.map(function(t,r){if(t.width>0){var s=e.left,a=e.top,c=e.width,u=e.height-i[2].width;switch(r){case 0:u=i[0].width,t.args=m({c1:[s,a],c2:[s+c,a],c3:[s+c-i[1].width,a+u],c4:[s+i[3].width,a+u]},n[0],n[1],o.topLeftOuter,o.topLeftInner,o.topRightOuter,o.topRightInner);break;case 1:s=e.left+e.width-i[1].width,c=i[1].width,t.args=m({c1:[s+c,a],c2:[s+c,a+u+i[2].width],c3:[s,a+u],c4:[s,a+i[0].width]},n[1],n[2],o.topRightOuter,o.topRightInner,o.bottomRightOuter,o.bottomRightInner);break;case 2:a=a+e.height-i[2].width,u=i[2].width,t.args=m({c1:[s+c,a+u],c2:[s,a+u],c3:[s+i[3].width,a],c4:[s+c-i[3].width,a]},n[2],n[3],o.bottomRightOuter,o.bottomRightInner,o.bottomLeftOuter,o.bottomLeftInner);break;case 3:c=i[3].width,t.args=m({c1:[s,a+u+i[2].width],c2:[s,a],c3:[s+c,a+i[0].width],c4:[s+c,a+u]},n[3],n[0],o.bottomLeftOuter,o.bottomLeftInner,o.topLeftOuter,o.topLeftInner)}}return t})}},d.prototype.parseBackgroundClip=function(t,e,n,i,o){var r=t.css("backgroundClip"),s=[];switch(r){case"content-box":case"padding-box":y(s,i[0],i[1],e.topLeftInner,e.topRightInner,o.left+n[3].width,o.top+n[0].width),y(s,i[1],i[2],e.topRightInner,e.bottomRightInner,o.left+o.width-n[1].width,o.top+n[0].width),y(s,i[2],i[3],e.bottomRightInner,e.bottomLeftInner,o.left+o.width-n[1].width,o.top+o.height-n[2].width),y(s,i[3],i[0],e.bottomLeftInner,e.topLeftInner,o.left+n[3].width,o.top+o.height-n[2].width);break;default:y(s,i[0],i[1],e.topLeftOuter,e.topRightOuter,o.left,o.top),y(s,i[1],i[2],e.topRightOuter,e.bottomRightOuter,o.left+o.width,o.top),y(s,i[2],i[3],e.bottomRightOuter,e.bottomLeftOuter,o.left+o.width,o.top+o.height),y(s,i[3],i[0],e.bottomLeftOuter,e.topLeftOuter,o.left,o.top+o.height)}return s},!function(){var n,i,o,r;!function(){var t={},e={};n=function(e,n,i){t[e]={deps:n,callback:i}},r=o=i=function(n){function o(t){if("."!==t.charAt(0))return t;for(var e=t.split("/"),i=n.split("/").slice(0,-1),o=0,r=e.length;r>o;o++){var 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