/*
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html2canvas 0.4.1 <http://html2canvas.hertzen.com>
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Copyright (c) 2013 Niklas von Hertzen
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Released under MIT License
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*/
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(function(window, document, undefined){
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"use strict";
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var _html2canvas = {},
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previousElement,
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computedCSS,
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html2canvas;
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_html2canvas.Util = {};
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_html2canvas.Util.log = function(a) {
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if (_html2canvas.logging && window.console && window.console.log) {
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window.console.log(a);
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}
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};
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_html2canvas.Util.trimText = (function(isNative){
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return function(input) {
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return isNative ? isNative.apply(input) : ((input || '') + '').replace( /^\s+|\s+$/g , '' );
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};
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})(String.prototype.trim);
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_html2canvas.Util.asFloat = function(v) {
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return parseFloat(v);
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};
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(function() {
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// TODO: support all possible length values
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var TEXT_SHADOW_PROPERTY = /((rgba|rgb)\([^\)]+\)(\s-?\d+px){0,})/g;
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var TEXT_SHADOW_VALUES = /(-?\d+px)|(#.+)|(rgb\(.+\))|(rgba\(.+\))/g;
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_html2canvas.Util.parseTextShadows = function (value) {
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if (!value || value === 'none') {
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return [];
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}
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// find multiple shadow declarations
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var shadows = value.match(TEXT_SHADOW_PROPERTY),
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results = [];
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for (var i = 0; shadows && (i < shadows.length); i++) {
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var s = shadows[i].match(TEXT_SHADOW_VALUES);
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results.push({
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color: s[0],
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offsetX: s[1] ? s[1].replace('px', '') : 0,
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offsetY: s[2] ? s[2].replace('px', '') : 0,
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blur: s[3] ? s[3].replace('px', '') : 0
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});
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}
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return results;
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};
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})();
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_html2canvas.Util.parseBackgroundImage = function (value) {
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var whitespace = ' \r\n\t',
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method, definition, prefix, prefix_i, block, results = [],
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c, mode = 0, numParen = 0, quote, args;
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var appendResult = function(){
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if(method) {
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if(definition.substr( 0, 1 ) === '"') {
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definition = definition.substr( 1, definition.length - 2 );
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}
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if(definition) {
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args.push(definition);
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}
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if(method.substr( 0, 1 ) === '-' &&
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(prefix_i = method.indexOf( '-', 1 ) + 1) > 0) {
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prefix = method.substr( 0, prefix_i);
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method = method.substr( prefix_i );
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}
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results.push({
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prefix: prefix,
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method: method.toLowerCase(),
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value: block,
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args: args
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});
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}
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args = []; //for some odd reason, setting .length = 0 didn't work in safari
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method =
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prefix =
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definition =
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block = '';
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};
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appendResult();
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for(var i = 0, ii = value.length; i<ii; i++) {
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c = value[i];
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if(mode === 0 && whitespace.indexOf( c ) > -1){
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continue;
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}
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switch(c) {
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case '"':
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if(!quote) {
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quote = c;
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}
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else if(quote === c) {
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quote = null;
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}
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break;
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case '(':
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if(quote) { break; }
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else if(mode === 0) {
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mode = 1;
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block += c;
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continue;
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} else {
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numParen++;
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}
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break;
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case ')':
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if(quote) { break; }
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else if(mode === 1) {
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if(numParen === 0) {
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mode = 0;
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block += c;
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appendResult();
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continue;
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} else {
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numParen--;
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}
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}
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break;
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case ',':
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if(quote) { break; }
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else if(mode === 0) {
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appendResult();
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continue;
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}
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else if (mode === 1) {
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if(numParen === 0 && !method.match(/^url$/i)) {
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args.push(definition);
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definition = '';
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block += c;
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continue;
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}
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}
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break;
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}
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block += c;
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if(mode === 0) { method += c; }
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else { definition += c; }
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}
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appendResult();
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return results;
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};
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_html2canvas.Util.Bounds = function (element) {
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var clientRect, bounds = {};
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if (element.getBoundingClientRect){
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clientRect = element.getBoundingClientRect();
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// TODO add scroll position to bounds, so no scrolling of window necessary
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bounds.top = clientRect.top;
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bounds.bottom = clientRect.bottom || (clientRect.top + clientRect.height);
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bounds.left = clientRect.left;
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bounds.width = element.offsetWidth;
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bounds.height = element.offsetHeight;
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}
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return bounds;
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};
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// TODO ideally, we'd want everything to go through this function instead of Util.Bounds,
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// but would require further work to calculate the correct positions for elements with offsetParents
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_html2canvas.Util.OffsetBounds = function (element) {
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var parent = element.offsetParent ? _html2canvas.Util.OffsetBounds(element.offsetParent) : {top: 0, left: 0};
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return {
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top: element.offsetTop + parent.top,
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bottom: element.offsetTop + element.offsetHeight + parent.top,
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left: element.offsetLeft + parent.left,
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width: element.offsetWidth,
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height: element.offsetHeight
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};
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};
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function toPX(element, attribute, value ) {
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var rsLeft = element.runtimeStyle && element.runtimeStyle[attribute],
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left,
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style = element.style;
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// Check if we are not dealing with pixels, (Opera has issues with this)
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// Ported from jQuery css.js
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// From the awesome hack by Dean Edwards
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// http://erik.eae.net/archives/2007/07/27/18.54.15/#comment-102291
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// If we're not dealing with a regular pixel number
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// but a number that has a weird ending, we need to convert it to pixels
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if ( !/^-?[0-9]+\.?[0-9]*(?:px)?$/i.test( value ) && /^-?\d/.test(value) ) {
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// Remember the original values
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left = style.left;
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// Put in the new values to get a computed value out
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if (rsLeft) {
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element.runtimeStyle.left = element.currentStyle.left;
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}
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style.left = attribute === "fontSize" ? "1em" : (value || 0);
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value = style.pixelLeft + "px";
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// Revert the changed values
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style.left = left;
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if (rsLeft) {
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element.runtimeStyle.left = rsLeft;
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}
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}
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if (!/^(thin|medium|thick)$/i.test(value)) {
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return Math.round(parseFloat(value)) + "px";
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}
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return value;
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}
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function asInt(val) {
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return parseInt(val, 10);
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}
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function parseBackgroundSizePosition(value, element, attribute, index) {
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value = (value || '').split(',');
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value = value[index || 0] || value[0] || 'auto';
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value = _html2canvas.Util.trimText(value).split(' ');
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if(attribute === 'backgroundSize' && (!value[0] || value[0].match(/cover|contain|auto/))) {
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//these values will be handled in the parent function
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} else {
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value[0] = (value[0].indexOf( "%" ) === -1) ? toPX(element, attribute + "X", value[0]) : value[0];
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if(value[1] === undefined) {
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if(attribute === 'backgroundSize') {
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value[1] = 'auto';
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return value;
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} else {
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// IE 9 doesn't return double digit always
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value[1] = value[0];
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}
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}
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value[1] = (value[1].indexOf("%") === -1) ? toPX(element, attribute + "Y", value[1]) : value[1];
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}
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return value;
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}
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_html2canvas.Util.getCSS = function (element, attribute, index) {
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if (previousElement !== element) {
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computedCSS = document.defaultView.getComputedStyle(element, null);
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}
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var value = computedCSS[attribute];
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if (/^background(Size|Position)$/.test(attribute)) {
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return parseBackgroundSizePosition(value, element, attribute, index);
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} else if (/border(Top|Bottom)(Left|Right)Radius/.test(attribute)) {
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var arr = value.split(" ");
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if (arr.length <= 1) {
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arr[1] = arr[0];
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}
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return arr.map(asInt);
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}
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return value;
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};
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_html2canvas.Util.resizeBounds = function( current_width, current_height, target_width, target_height, stretch_mode ){
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var target_ratio = target_width / target_height,
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current_ratio = current_width / current_height,
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output_width, output_height;
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if(!stretch_mode || stretch_mode === 'auto') {
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output_width = target_width;
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output_height = target_height;
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} else if(target_ratio < current_ratio ^ stretch_mode === 'contain') {
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output_height = target_height;
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output_width = target_height * current_ratio;
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} else {
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output_width = target_width;
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output_height = target_width / current_ratio;
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}
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return {
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width: output_width,
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height: output_height
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};
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};
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function backgroundBoundsFactory( prop, el, bounds, image, imageIndex, backgroundSize ) {
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var bgposition = _html2canvas.Util.getCSS( el, prop, imageIndex ) ,
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topPos,
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left,
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percentage,
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val;
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if (bgposition.length === 1){
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val = bgposition[0];
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bgposition = [];
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bgposition[0] = val;
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bgposition[1] = val;
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}
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if (bgposition[0].toString().indexOf("%") !== -1){
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percentage = (parseFloat(bgposition[0])/100);
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left = bounds.width * percentage;
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if(prop !== 'backgroundSize') {
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left -= (backgroundSize || image).width*percentage;
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}
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} else {
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if(prop === 'backgroundSize') {
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if(bgposition[0] === 'auto') {
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left = image.width;
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} else {
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if (/contain|cover/.test(bgposition[0])) {
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var resized = _html2canvas.Util.resizeBounds(image.width, image.height, bounds.width, bounds.height, bgposition[0]);
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left = resized.width;
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topPos = resized.height;
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} else {
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left = parseInt(bgposition[0], 10);
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}
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}
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} else {
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left = parseInt( bgposition[0], 10);
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}
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}
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if(bgposition[1] === 'auto') {
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topPos = left / image.width * image.height;
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} else if (bgposition[1].toString().indexOf("%") !== -1){
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percentage = (parseFloat(bgposition[1])/100);
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topPos = bounds.height * percentage;
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if(prop !== 'backgroundSize') {
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topPos -= (backgroundSize || image).height * percentage;
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}
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} else {
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topPos = parseInt(bgposition[1],10);
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}
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return [left, topPos];
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}
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_html2canvas.Util.BackgroundPosition = function( el, bounds, image, imageIndex, backgroundSize ) {
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var result = backgroundBoundsFactory( 'backgroundPosition', el, bounds, image, imageIndex, backgroundSize );
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return { left: result[0], top: result[1] };
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};
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_html2canvas.Util.BackgroundSize = function( el, bounds, image, imageIndex ) {
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var result = backgroundBoundsFactory( 'backgroundSize', el, bounds, image, imageIndex );
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return { width: result[0], height: result[1] };
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};
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_html2canvas.Util.Extend = function (options, defaults) {
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for (var key in options) {
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if (options.hasOwnProperty(key)) {
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defaults[key] = options[key];
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}
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}
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return defaults;
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};
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/*
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* Derived from jQuery.contents()
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* Copyright 2010, John Resig
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* Dual licensed under the MIT or GPL Version 2 licenses.
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* http://jquery.org/license
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*/
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_html2canvas.Util.Children = function( elem ) {
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var children;
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try {
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children = (elem.nodeName && elem.nodeName.toUpperCase() === "IFRAME") ? elem.contentDocument || elem.contentWindow.document : (function(array) {
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var ret = [];
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if (array !== null) {
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(function(first, second ) {
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var i = first.length,
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j = 0;
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if (typeof second.length === "number") {
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for (var l = second.length; j < l; j++) {
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first[i++] = second[j];
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}
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} else {
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while (second[j] !== undefined) {
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first[i++] = second[j++];
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}
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}
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first.length = i;
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return first;
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})(ret, array);
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}
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return ret;
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})(elem.childNodes);
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} catch (ex) {
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_html2canvas.Util.log("html2canvas.Util.Children failed with exception: " + ex.message);
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children = [];
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}
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return children;
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};
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_html2canvas.Util.isTransparent = function(backgroundColor) {
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return (backgroundColor === "transparent" || backgroundColor === "rgba(0, 0, 0, 0)");
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};
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_html2canvas.Util.Font = (function () {
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var fontData = {};
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return function(font, fontSize, doc) {
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if (fontData[font + "-" + fontSize] !== undefined) {
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return fontData[font + "-" + fontSize];
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}
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var container = doc.createElement('div'),
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img = doc.createElement('img'),
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span = doc.createElement('span'),
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sampleText = 'Hidden Text',
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baseline,
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middle,
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metricsObj;
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container.style.visibility = "hidden";
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container.style.fontFamily = font;
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container.style.fontSize = fontSize;
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container.style.margin = 0;
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container.style.padding = 0;
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doc.body.appendChild(container);
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// http://probablyprogramming.com/2009/03/15/the-tiniest-gif-ever (handtinywhite.gif)
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img.src = "data:image/gif;base64,R0lGODlhAQABAIABAP///wAAACwAAAAAAQABAAACAkQBADs=";
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img.width = 1;
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img.height = 1;
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img.style.margin = 0;
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img.style.padding = 0;
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img.style.verticalAlign = "baseline";
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span.style.fontFamily = font;
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span.style.fontSize = fontSize;
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span.style.margin = 0;
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span.style.padding = 0;
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span.appendChild(doc.createTextNode(sampleText));
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container.appendChild(span);
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container.appendChild(img);
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baseline = (img.offsetTop - span.offsetTop) + 1;
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container.removeChild(span);
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container.appendChild(doc.createTextNode(sampleText));
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container.style.lineHeight = "normal";
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img.style.verticalAlign = "super";
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middle = (img.offsetTop-container.offsetTop) + 1;
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metricsObj = {
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baseline: baseline,
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lineWidth: 1,
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middle: middle
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};
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fontData[font + "-" + fontSize] = metricsObj;
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doc.body.removeChild(container);
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return metricsObj;
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};
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})();
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(function(){
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var Util = _html2canvas.Util,
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Generate = {};
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_html2canvas.Generate = Generate;
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var reGradients = [
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/^(-webkit-linear-gradient)\(([a-z\s]+)([\w\d\.\s,%\(\)]+)\)$/,
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/^(-o-linear-gradient)\(([a-z\s]+)([\w\d\.\s,%\(\)]+)\)$/,
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/^(-webkit-gradient)\((linear|radial),\s((?:\d{1,3}%?)\s(?:\d{1,3}%?),\s(?:\d{1,3}%?)\s(?:\d{1,3}%?))([\w\d\.\s,%\(\)\-]+)\)$/,
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/^(-moz-linear-gradient)\(((?:\d{1,3}%?)\s(?:\d{1,3}%?))([\w\d\.\s,%\(\)]+)\)$/,
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/^(-webkit-radial-gradient)\(((?:\d{1,3}%?)\s(?:\d{1,3}%?)),\s(\w+)\s([a-z\-]+)([\w\d\.\s,%\(\)]+)\)$/,
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/^(-moz-radial-gradient)\(((?:\d{1,3}%?)\s(?:\d{1,3}%?)),\s(\w+)\s?([a-z\-]*)([\w\d\.\s,%\(\)]+)\)$/,
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/^(-o-radial-gradient)\(((?:\d{1,3}%?)\s(?:\d{1,3}%?)),\s(\w+)\s([a-z\-]+)([\w\d\.\s,%\(\)]+)\)$/
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];
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/*
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* TODO: Add IE10 vendor prefix (-ms) support
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* TODO: Add W3C gradient (linear-gradient) support
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* TODO: Add old Webkit -webkit-gradient(radial, ...) support
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* TODO: Maybe some RegExp optimizations are possible ;o)
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*/
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Generate.parseGradient = function(css, bounds) {
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var gradient, i, len = reGradients.length, m1, stop, m2, m2Len, step, m3, tl,tr,br,bl;
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for(i = 0; i < len; i+=1){
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m1 = css.match(reGradients[i]);
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if(m1) {
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break;
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}
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}
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if(m1) {
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switch(m1[1]) {
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case '-webkit-linear-gradient':
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case '-o-linear-gradient':
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gradient = {
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type: 'linear',
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x0: null,
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y0: null,
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x1: null,
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y1: null,
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colorStops: []
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};
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// get coordinates
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m2 = m1[2].match(/\w+/g);
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if(m2){
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m2Len = m2.length;
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for(i = 0; i < m2Len; i+=1){
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switch(m2[i]) {
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case 'top':
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gradient.y0 = 0;
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gradient.y1 = bounds.height;
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break;
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case 'right':
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gradient.x0 = bounds.width;
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gradient.x1 = 0;
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break;
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case 'bottom':
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gradient.y0 = bounds.height;
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gradient.y1 = 0;
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break;
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case 'left':
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gradient.x0 = 0;
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gradient.x1 = bounds.width;
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break;
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}
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}
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}
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if(gradient.x0 === null && gradient.x1 === null){ // center
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gradient.x0 = gradient.x1 = bounds.width / 2;
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}
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if(gradient.y0 === null && gradient.y1 === null){ // center
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gradient.y0 = gradient.y1 = bounds.height / 2;
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}
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// get colors and stops
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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);
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if(m2){
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m2Len = m2.length;
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step = 1 / Math.max(m2Len - 1, 1);
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for(i = 0; i < m2Len; i+=1){
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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)?/);
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if(m3[2]){
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stop = parseFloat(m3[2]);
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if(m3[3] === '%'){
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stop /= 100;
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} else { // px - stupid opera
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stop /= bounds.width;
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}
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} else {
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stop = i * step;
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}
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gradient.colorStops.push({
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color: m3[1],
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stop: stop
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});
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}
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}
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break;
|
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case '-webkit-gradient':
|
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gradient = {
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type: m1[2] === 'radial' ? 'circle' : m1[2], // TODO: Add radial gradient support for older mozilla definitions
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x0: 0,
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y0: 0,
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x1: 0,
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y1: 0,
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colorStops: []
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};
|
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// get coordinates
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m2 = m1[3].match(/(\d{1,3})%?\s(\d{1,3})%?,\s(\d{1,3})%?\s(\d{1,3})%?/);
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if(m2){
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gradient.x0 = (m2[1] * bounds.width) / 100;
|
gradient.y0 = (m2[2] * bounds.height) / 100;
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gradient.x1 = (m2[3] * bounds.width) / 100;
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gradient.y1 = (m2[4] * bounds.height) / 100;
|
}
|
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// 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){
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m2Len = m2.length;
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for(i = 0; i < m2Len; i+=1){
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m3 = m2[i].match(/(from|to|color-stop)\(([0-9\.]+)?(?:,\s)?((?:rgb|rgba)\(\d{1,3},\s\d{1,3},\s\d{1,3}(?:,\s[0-9\.]+)?\))\)/);
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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
|
});
|
}
|
}
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break;
|
|
case '-moz-linear-gradient':
|
|
gradient = {
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type: 'linear',
|
x0: 0,
|
y0: 0,
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x1: 0,
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y1: 0,
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colorStops: []
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};
|
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// get coordinates
|
m2 = m1[2].match(/(\d{1,3})%?\s(\d{1,3})%?/);
|
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// m2[1] == 0% -> left
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// 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;
|
};
|
|
function addScrollStops(grad) {
|
return function(colorStop) {
|
try {
|
grad.addColorStop(colorStop.stop, colorStop.color);
|
}
|
catch(e) {
|
Util.log(['failed to add color stop: ', e, '; tried to add: ', colorStop]);
|
}
|
};
|
}
|
|
Generate.Gradient = function(src, bounds) {
|
if(bounds.width === 0 || bounds.height === 0) {
|
return;
|
}
|
|
var canvas = document.createElement('canvas'),
|
ctx = canvas.getContext('2d'),
|
gradient, grad;
|
|
canvas.width = bounds.width;
|
canvas.height = bounds.height;
|
|
// TODO: add support for multi defined background gradients
|
gradient = _html2canvas.Generate.parseGradient(src, bounds);
|
|
if(gradient) {
|
switch(gradient.type) {
|
case 'linear':
|
grad = ctx.createLinearGradient(gradient.x0, gradient.y0, gradient.x1, gradient.y1);
|
gradient.colorStops.forEach(addScrollStops(grad));
|
ctx.fillStyle = grad;
|
ctx.fillRect(0, 0, bounds.width, bounds.height);
|
break;
|
|
case 'circle':
|
grad = ctx.createRadialGradient(gradient.cx, gradient.cy, 0, gradient.cx, gradient.cy, gradient.rx);
|
gradient.colorStops.forEach(addScrollStops(grad));
|
ctx.fillStyle = grad;
|
ctx.fillRect(0, 0, bounds.width, bounds.height);
|
break;
|
|
case 'ellipse':
|
var canvasRadial = document.createElement('canvas'),
|
ctxRadial = canvasRadial.getContext('2d'),
|
ri = Math.max(gradient.rx, gradient.ry),
|
di = ri * 2;
|
|
canvasRadial.width = canvasRadial.height = di;
|
|
grad = ctxRadial.createRadialGradient(gradient.rx, gradient.ry, 0, gradient.rx, gradient.ry, ri);
|
gradient.colorStops.forEach(addScrollStops(grad));
|
|
ctxRadial.fillStyle = grad;
|
ctxRadial.fillRect(0, 0, di, di);
|
|
ctx.fillStyle = gradient.colorStops[gradient.colorStops.length - 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);
|
break;
|
}
|
}
|
|
return canvas;
|
};
|
|
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;
|
};
|
|
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
|
});
|
return 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,
|
Util = _html2canvas.Util,
|
support = Util.Support(options, doc),
|
ignoreElementsRegExp = new RegExp("(" + options.ignoreElements + ")"),
|
body = doc.body,
|
getCSS = 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 capitalize(m, p1, p2) {
|
if (m.length > 0) {
|
return p1 + p2.toUpperCase();
|
}
|
}
|
|
function textTransform (text, transform) {
|
switch(transform){
|
case "lowercase":
|
return text.toLowerCase();
|
case "capitalize":
|
return text.replace( /(^|\s|:|-|\(|\))([a-z])/g, capitalize);
|
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 && 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"),
|
shadows = Util.parseTextShadows(getCSS(el, "textShadow"));
|
|
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 (shadows.length) {
|
// TODO: support multiple text shadows
|
// apply the first text shadow
|
ctx.setVariable("shadowColor", shadows[0].color);
|
ctx.setVariable("shadowOffsetX", shadows[0].offsetX);
|
ctx.setVariable("shadowOffsetY", shadows[0].offsetY);
|
ctx.setVariable("shadowBlur", shadows[0].blur);
|
}
|
|
if (text_decoration !== "none"){
|
return 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, transform) {
|
var bounds;
|
if (support.rangeBounds && !transform) {
|
if (textDecoration !== "none" || 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, transform);
|
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, transform) {
|
var parent = oldTextNode.parentNode,
|
wrapElement = doc.createElement('wrapper'),
|
backupText = oldTextNode.cloneNode(true);
|
|
wrapElement.appendChild(oldTextNode.cloneNode(true));
|
parent.replaceChild(wrapElement, oldTextNode);
|
|
var bounds = transform ? Util.OffsetBounds(wrapElement) : 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 (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), stack.transform.matrix);
|
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 = 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;
|
}
|
|
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];
|
return (img && img.succeeded === true) ? img.img : 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(element, stack, parentStack){
|
var newContext,
|
isPositioned = stack.cssPosition !== 'static',
|
zIndex = isPositioned ? getCSS(element, 'zIndex') : 'auto',
|
opacity = getCSS(element, 'opacity'),
|
isFloated = getCSS(element, 'cssFloat') !== 'none';
|
|
// https://developer.mozilla.org/en-US/docs/Web/Guide/CSS/Understanding_z_index/The_stacking_context
|
// When a new stacking context should be created:
|
// the root element (HTML),
|
// positioned (absolutely or relatively) with a z-index value other than "auto",
|
// elements with an opacity value less than 1. (See the specification for opacity),
|
// on mobile WebKit and Chrome 22+, position: fixed always creates a new stacking context, even when z-index is "auto" (See this post)
|
|
stack.zIndex = newContext = h2czContext(zIndex);
|
newContext.isPositioned = isPositioned;
|
newContext.isFloated = isFloated;
|
newContext.opacity = opacity;
|
newContext.ownStacking = (zIndex !== 'auto' || opacity < 1);
|
|
if (parentStack) {
|
parentStack.zIndex.children.push(stack);
|
}
|
}
|
|
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],
|
brh = borderRadius[2][0],
|
brv = 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[3].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"
|
Util.log("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" || elStyle.display === "none") {
|
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) {
|
Util.log(['Tried to assign readonly property ', prop, 'Error:', e]);
|
}
|
});
|
|
if(isImage) {
|
elps.src = 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 = Util.BackgroundSize(el, bounds, image, imageIndex),
|
backgroundPosition = Util.BackgroundPosition(el, bounds, image, imageIndex, backgroundSize),
|
backgroundRepeat = getCSS(el, "backgroundRepeat").split(",").map(Util.trimText);
|
|
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 = 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 {
|
Util.log("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) {
|
return ctx.setVariable("globalAlpha", getCSS(element, "opacity") * ((parentStack) ? parentStack.opacity : 1));
|
}
|
|
function removePx(str) {
|
return str.replace("px", "");
|
}
|
|
var transformRegExp = /(matrix)\((.+)\)/;
|
|
function getTransform(element, parentStack) {
|
var transform = getCSS(element, "transform") || getCSS(element, "-webkit-transform") || getCSS(element, "-moz-transform") || getCSS(element, "-ms-transform") || getCSS(element, "-o-transform");
|
var transformOrigin = getCSS(element, "transform-origin") || getCSS(element, "-webkit-transform-origin") || getCSS(element, "-moz-transform-origin") || getCSS(element, "-ms-transform-origin") || getCSS(element, "-o-transform-origin") || "0px 0px";
|
|
transformOrigin = transformOrigin.split(" ").map(removePx).map(Util.asFloat);
|
|
var matrix;
|
if (transform && transform !== "none") {
|
var match = transform.match(transformRegExp);
|
if (match) {
|
switch(match[1]) {
|
case "matrix":
|
matrix = match[2].split(",").map(Util.trimText).map(Util.asFloat);
|
break;
|
}
|
}
|
}
|
|
return {
|
origin: transformOrigin,
|
matrix: matrix
|
};
|
}
|
|
function createStack(element, parentStack, bounds, transform) {
|
var ctx = h2cRenderContext((!parentStack) ? documentWidth() : bounds.width , (!parentStack) ? documentHeight() : bounds.height),
|
stack = {
|
ctx: ctx,
|
opacity: setOpacity(ctx, element, parentStack),
|
cssPosition: getCSS(element, "position"),
|
borders: getBorderData(element),
|
transform: transform,
|
clip: (parentStack && parentStack.clip) ? Util.Extend( {}, parentStack.clip ) : null
|
};
|
|
setZ(element, stack, parentStack);
|
|
// 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;
|
}
|
|
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 getBounds(element, transform) {
|
var bounds = (transform.matrix) ? Util.OffsetBounds(element) : Util.Bounds(element);
|
transform.origin[0] += bounds.left;
|
transform.origin[1] += bounds.top;
|
return bounds;
|
}
|
|
function renderElement(element, parentStack, pseudoElement, ignoreBackground) {
|
var transform = getTransform(element, parentStack),
|
bounds = getBounds(element, transform),
|
image,
|
stack = createStack(element, parentStack, bounds, transform),
|
borders = stack.borders,
|
ctx = stack.ctx,
|
backgroundBounds = getBackgroundBounds(borders, bounds, stack.clip),
|
borderData = parseBorders(element, bounds, borders),
|
backgroundColor = (ignoreElementsRegExp.test(element.nodeName)) ? "#efefef" : getCSS(element, "backgroundColor");
|
|
|
createShape(ctx, borderData.clip);
|
|
ctx.save();
|
ctx.clip();
|
|
if (backgroundBounds.height > 0 && backgroundBounds.width > 0 && !ignoreBackground) {
|
renderBackgroundColor(ctx, bounds, backgroundColor);
|
renderBackgroundImage(element, backgroundBounds, ctx);
|
} else if (ignoreBackground) {
|
stack.backgroundColor = backgroundColor;
|
}
|
|
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 {
|
Util.log("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 (element, stack, pseudoElement) {
|
if (isElementVisible(element)) {
|
stack = renderElement(element, stack, pseudoElement, false) || stack;
|
if (!ignoreElementsRegExp.test(element.nodeName)) {
|
parseChildren(element, stack, pseudoElement);
|
}
|
}
|
}
|
|
function parseChildren(element, stack, pseudoElement) {
|
Util.Children(element).forEach(function(node) {
|
if (node.nodeType === node.ELEMENT_NODE) {
|
parseElement(node, stack, pseudoElement);
|
} else if (node.nodeType === node.TEXT_NODE) {
|
renderText(element, node, stack);
|
}
|
});
|
}
|
|
function init() {
|
var background = getCSS(document.documentElement, "backgroundColor"),
|
transparentBackground = (Util.isTransparent(background) && element === document.body),
|
stack = renderElement(element, null, false, transparentBackground);
|
parseChildren(element, stack);
|
|
if (transparentBackground) {
|
background = stack.backgroundColor;
|
}
|
|
body.removeChild(hidePseudoElements);
|
return {
|
backgroundColor: background,
|
stack: stack
|
};
|
}
|
|
return init();
|
};
|
|
function h2czContext(zindex) {
|
return {
|
zindex: zindex,
|
children: []
|
};
|
}
|
|
_html2canvas.Preload = function( options ) {
|
|
var images = {
|
numLoaded: 0, // also failed are counted here
|
numFailed: 0,
|
numTotal: 0,
|
cleanupDone: false
|
},
|
pageOrigin,
|
Util = _html2canvas.Util,
|
methods,
|
i,
|
count = 0,
|
element = options.elements[0] || document.body,
|
doc = element.ownerDocument,
|
domImages = element.getElementsByTagName('img'), // Fetch images of the present element only
|
imgLen = domImages.length,
|
link = doc.createElement("a"),
|
supportCORS = (function( img ){
|
return (img.crossOrigin !== undefined);
|
})(new Image()),
|
timeoutTimer;
|
|
link.href = window.location.href;
|
pageOrigin = link.protocol + link.host;
|
|
function isSameOrigin(url){
|
link.href = url;
|
link.href = link.href; // YES, BELIEVE IT OR NOT, that is required for IE9 - http://jsfiddle.net/niklasvh/2e48b/
|
var origin = link.protocol + link.host;
|
return (origin === pageOrigin);
|
}
|
|
function start(){
|
Util.log("html2canvas: start: images: " + images.numLoaded + " / " + images.numTotal + " (failed: " + images.numFailed + ")");
|
if (!images.firstRun && images.numLoaded >= images.numTotal){
|
Util.log("Finished loading images: # " + images.numTotal + " (failed: " + images.numFailed + ")");
|
|
if (typeof options.complete === "function"){
|
options.complete(images);
|
}
|
|
}
|
}
|
|
// TODO modify proxy to serve images with CORS enabled, where available
|
function proxyGetImage(url, img, imageObj){
|
var callback_name,
|
scriptUrl = options.proxy,
|
script;
|
|
link.href = url;
|
url = link.href; // work around for pages with base href="" set - WARNING: this may change the url
|
|
callback_name = 'html2canvas_' + (count++);
|
imageObj.callbackname = callback_name;
|
|
if (scriptUrl.indexOf("?") > -1) {
|
scriptUrl += "&";
|
} else {
|
scriptUrl += "?";
|
}
|
scriptUrl += 'url=' + encodeURIComponent(url) + '&callback=' + callback_name;
|
script = doc.createElement("script");
|
|
window[callback_name] = function(a){
|
if (a.substring(0,6) === "error:"){
|
imageObj.succeeded = false;
|
images.numLoaded++;
|
images.numFailed++;
|
start();
|
} else {
|
setImageLoadHandlers(img, imageObj);
|
img.src = a;
|
}
|
window[callback_name] = undefined; // to work with IE<9 // NOTE: that the undefined callback property-name still exists on the window object (for IE<9)
|
try {
|
delete window[callback_name]; // for all browser that support this
|
} catch(ex) {}
|
script.parentNode.removeChild(script);
|
script = null;
|
delete imageObj.script;
|
delete imageObj.callbackname;
|
};
|
|
script.setAttribute("type", "text/javascript");
|
script.setAttribute("src", scriptUrl);
|
imageObj.script = script;
|
window.document.body.appendChild(script);
|
|
}
|
|
function loadPseudoElement(element, type) {
|
var style = window.getComputedStyle(element, type),
|
content = style.content;
|
if (content.substr(0, 3) === 'url') {
|
methods.loadImage(_html2canvas.Util.parseBackgroundImage(content)[0].args[0]);
|
}
|
loadBackgroundImages(style.backgroundImage, element);
|
}
|
|
function loadPseudoElementImages(element) {
|
loadPseudoElement(element, ":before");
|
loadPseudoElement(element, ":after");
|
}
|
|
function loadGradientImage(backgroundImage, bounds) {
|
var img = _html2canvas.Generate.Gradient(backgroundImage, bounds);
|
|
if (img !== undefined){
|
images[backgroundImage] = {
|
img: img,
|
succeeded: true
|
};
|
images.numTotal++;
|
images.numLoaded++;
|
start();
|
}
|
}
|
|
function invalidBackgrounds(background_image) {
|
return (background_image && background_image.method && background_image.args && background_image.args.length > 0 );
|
}
|
|
function loadBackgroundImages(background_image, el) {
|
var bounds;
|
|
_html2canvas.Util.parseBackgroundImage(background_image).filter(invalidBackgrounds).forEach(function(background_image) {
|
if (background_image.method === 'url') {
|
methods.loadImage(background_image.args[0]);
|
} else if(background_image.method.match(/\-?gradient$/)) {
|
if(bounds === undefined) {
|
bounds = _html2canvas.Util.Bounds(el);
|
}
|
loadGradientImage(background_image.value, bounds);
|
}
|
});
|
}
|
|
function getImages (el) {
|
var elNodeType = false;
|
|
// Firefox fails with permission denied on pages with iframes
|
try {
|
Util.Children(el).forEach(getImages);
|
}
|
catch( e ) {}
|
|
try {
|
elNodeType = el.nodeType;
|
} catch (ex) {
|
elNodeType = false;
|
Util.log("html2canvas: failed to access some element's nodeType - Exception: " + ex.message);
|
}
|
|
if (elNodeType === 1 || elNodeType === undefined) {
|
loadPseudoElementImages(el);
|
try {
|
loadBackgroundImages(Util.getCSS(el, 'backgroundImage'), el);
|
} catch(e) {
|
Util.log("html2canvas: failed to get background-image - Exception: " + e.message);
|
}
|
loadBackgroundImages(el);
|
}
|
}
|
|
function setImageLoadHandlers(img, imageObj) {
|
img.onload = function() {
|
if ( imageObj.timer !== undefined ) {
|
// CORS succeeded
|
window.clearTimeout( imageObj.timer );
|
}
|
|
images.numLoaded++;
|
imageObj.succeeded = true;
|
img.onerror = img.onload = null;
|
start();
|
};
|
img.onerror = function() {
|
if (img.crossOrigin === "anonymous") {
|
// CORS failed
|
window.clearTimeout( imageObj.timer );
|
|
// let's try with proxy instead
|
if ( options.proxy ) {
|
var src = img.src;
|
img = new Image();
|
imageObj.img = img;
|
img.src = src;
|
|
proxyGetImage( img.src, img, imageObj );
|
return;
|
}
|
}
|
|
images.numLoaded++;
|
images.numFailed++;
|
imageObj.succeeded = false;
|
img.onerror = img.onload = null;
|
start();
|
};
|
}
|
|
methods = {
|
loadImage: function( src ) {
|
var img, imageObj;
|
if ( src && images[src] === undefined ) {
|
img = new Image();
|
if ( src.match(/data:image\/.*;base64,/i) ) {
|
img.src = src.replace(/url\(['"]{0,}|['"]{0,}\)$/ig, '');
|
imageObj = images[src] = {
|
img: img
|
};
|
images.numTotal++;
|
setImageLoadHandlers(img, imageObj);
|
} else if ( isSameOrigin( src ) || options.allowTaint === true ) {
|
imageObj = images[src] = {
|
img: img
|
};
|
images.numTotal++;
|
setImageLoadHandlers(img, imageObj);
|
img.src = src;
|
} else if ( supportCORS && !options.allowTaint && options.useCORS ) {
|
// attempt to load with CORS
|
|
img.crossOrigin = "anonymous";
|
imageObj = images[src] = {
|
img: img
|
};
|
images.numTotal++;
|
setImageLoadHandlers(img, imageObj);
|
img.src = src;
|
} else if ( options.proxy ) {
|
imageObj = images[src] = {
|
img: img
|
};
|
images.numTotal++;
|
proxyGetImage( src, img, imageObj );
|
}
|
}
|
|
},
|
cleanupDOM: function(cause) {
|
var img, src;
|
if (!images.cleanupDone) {
|
if (cause && typeof cause === "string") {
|
Util.log("html2canvas: Cleanup because: " + cause);
|
} else {
|
Util.log("html2canvas: Cleanup after timeout: " + options.timeout + " ms.");
|
}
|
|
for (src in images) {
|
if (images.hasOwnProperty(src)) {
|
img = images[src];
|
if (typeof img === "object" && img.callbackname && img.succeeded === undefined) {
|
// cancel proxy image request
|
window[img.callbackname] = undefined; // to work with IE<9 // NOTE: that the undefined callback property-name still exists on the window object (for IE<9)
|
try {
|
delete window[img.callbackname]; // for all browser that support this
|
} catch(ex) {}
|
if (img.script && img.script.parentNode) {
|
img.script.setAttribute("src", "about:blank"); // try to cancel running request
|
img.script.parentNode.removeChild(img.script);
|
}
|
images.numLoaded++;
|
images.numFailed++;
|
Util.log("html2canvas: Cleaned up failed img: '" + src + "' Steps: " + images.numLoaded + " / " + images.numTotal);
|
}
|
}
|
}
|
|
// cancel any pending requests
|
if(window.stop !== undefined) {
|
window.stop();
|
} else if(document.execCommand !== undefined) {
|
document.execCommand("Stop", false);
|
}
|
if (document.close !== undefined) {
|
document.close();
|
}
|
images.cleanupDone = true;
|
if (!(cause && typeof cause === "string")) {
|
start();
|
}
|
}
|
},
|
|
renderingDone: function() {
|
if (timeoutTimer) {
|
window.clearTimeout(timeoutTimer);
|
}
|
}
|
};
|
|
if (options.timeout > 0) {
|
timeoutTimer = window.setTimeout(methods.cleanupDOM, options.timeout);
|
}
|
|
Util.log('html2canvas: Preload starts: finding background-images');
|
images.firstRun = true;
|
|
getImages(element);
|
|
Util.log('html2canvas: Preload: Finding images');
|
// load <img> images
|
for (i = 0; i < imgLen; i+=1){
|
methods.loadImage( domImages[i].getAttribute( "src" ) );
|
}
|
|
images.firstRun = false;
|
Util.log('html2canvas: Preload: Done.');
|
if (images.numTotal === images.numLoaded) {
|
start();
|
}
|
|
return methods;
|
};
|
|
_html2canvas.Renderer = function(parseQueue, options){
|
|
// http://www.w3.org/TR/CSS21/zindex.html
|
function createRenderQueue(parseQueue) {
|
var queue = [],
|
rootContext;
|
|
rootContext = (function buildStackingContext(rootNode) {
|
var rootContext = {};
|
function insert(context, node, specialParent) {
|
var zi = (node.zIndex.zindex === 'auto') ? 0 : Number(node.zIndex.zindex),
|
contextForChildren = context, // the stacking context for children
|
isPositioned = node.zIndex.isPositioned,
|
isFloated = node.zIndex.isFloated,
|
stub = {node: node},
|
childrenDest = specialParent; // where children without z-index should be pushed into
|
|
if (node.zIndex.ownStacking) {
|
// '!' comes before numbers in sorted array
|
contextForChildren = stub.context = { '!': [{node:node, children: []}]};
|
childrenDest = undefined;
|
} else if (isPositioned || isFloated) {
|
childrenDest = stub.children = [];
|
}
|
|
if (zi === 0 && specialParent) {
|
specialParent.push(stub);
|
} else {
|
if (!context[zi]) { context[zi] = []; }
|
context[zi].push(stub);
|
}
|
|
node.zIndex.children.forEach(function(childNode) {
|
insert(contextForChildren, childNode, childrenDest);
|
});
|
}
|
insert(rootContext, rootNode);
|
return rootContext;
|
})(parseQueue);
|
|
function sortZ(context) {
|
Object.keys(context).sort().forEach(function(zi) {
|
var nonPositioned = [],
|
floated = [],
|
positioned = [],
|
list = [];
|
|
// positioned after static
|
context[zi].forEach(function(v) {
|
if (v.node.zIndex.isPositioned || v.node.zIndex.opacity < 1) {
|
// http://www.w3.org/TR/css3-color/#transparency
|
// non-positioned element with opactiy < 1 should be stacked as if it were a positioned element with ‘z-index: 0’ and ‘opacity: 1’.
|
positioned.push(v);
|
} else if (v.node.zIndex.isFloated) {
|
floated.push(v);
|
} else {
|
nonPositioned.push(v);
|
}
|
});
|
|
(function walk(arr) {
|
arr.forEach(function(v) {
|
list.push(v);
|
if (v.children) { walk(v.children); }
|
});
|
})(nonPositioned.concat(floated, positioned));
|
|
list.forEach(function(v) {
|
if (v.context) {
|
sortZ(v.context);
|
} else {
|
queue.push(v.node);
|
}
|
});
|
});
|
}
|
|
sortZ(rootContext);
|
|
return queue;
|
}
|
|
function getRenderer(rendererName) {
|
var renderer;
|
|
if (typeof options.renderer === "string" && _html2canvas.Renderer[rendererName] !== undefined) {
|
renderer = _html2canvas.Renderer[rendererName](options);
|
} else if (typeof rendererName === "function") {
|
renderer = rendererName(options);
|
} else {
|
throw new Error("Unknown renderer");
|
}
|
|
if ( typeof renderer !== "function" ) {
|
throw new Error("Invalid renderer defined");
|
}
|
return renderer;
|
}
|
|
return getRenderer(options.renderer)(parseQueue, options, document, createRenderQueue(parseQueue.stack), _html2canvas);
|
};
|
|
_html2canvas.Util.Support = function (options, doc) {
|
|
function supportSVGRendering() {
|
var img = new Image(),
|
canvas = doc.createElement("canvas"),
|
ctx = (canvas.getContext === undefined) ? false : canvas.getContext("2d");
|
if (ctx === false) {
|
return false;
|
}
|
canvas.width = canvas.height = 10;
|
img.src = [
|
"data:image/svg+xml,",
|
"<svg xmlns='http://www.w3.org/2000/svg' width='10' height='10'>",
|
"<foreignObject width='10' height='10'>",
|
"<div xmlns='http://www.w3.org/1999/xhtml' style='width:10;height:10;'>",
|
"sup",
|
"</div>",
|
"</foreignObject>",
|
"</svg>"
|
].join("");
|
try {
|
ctx.drawImage(img, 0, 0);
|
canvas.toDataURL();
|
} catch(e) {
|
return false;
|
}
|
_html2canvas.Util.log('html2canvas: Parse: SVG powered rendering available');
|
return true;
|
}
|
|
// Test whether we can use ranges to measure bounding boxes
|
// Opera doesn't provide valid bounds.height/bottom even though it supports the method.
|
|
function supportRangeBounds() {
|
var r, testElement, rangeBounds, rangeHeight, support = false;
|
|
if (doc.createRange) {
|
r = doc.createRange();
|
if (r.getBoundingClientRect) {
|
testElement = doc.createElement('boundtest');
|
testElement.style.height = "123px";
|
testElement.style.display = "block";
|
doc.body.appendChild(testElement);
|
|
r.selectNode(testElement);
|
rangeBounds = r.getBoundingClientRect();
|
rangeHeight = rangeBounds.height;
|
|
if (rangeHeight === 123) {
|
support = true;
|
}
|
doc.body.removeChild(testElement);
|
}
|
}
|
|
return support;
|
}
|
|
return {
|
rangeBounds: supportRangeBounds(),
|
svgRendering: options.svgRendering && supportSVGRendering()
|
};
|
};
|
window.html2canvas = function(elements, opts) {
|
elements = (elements.length) ? elements : [elements];
|
var queue,
|
canvas,
|
options = {
|
// general
|
logging: false,
|
elements: elements,
|
background: "#fff",
|
|
// preload options
|
proxy: null,
|
timeout: 0, // no timeout
|
useCORS: false, // try to load images as CORS (where available), before falling back to proxy
|
allowTaint: false, // whether to allow images to taint the canvas, won't need proxy if set to true
|
|
// parse options
|
svgRendering: false, // use svg powered rendering where available (FF11+)
|
ignoreElements: "IFRAME|OBJECT|PARAM",
|
useOverflow: true,
|
letterRendering: false,
|
chinese: false,
|
|
// render options
|
|
width: null,
|
height: null,
|
taintTest: true, // do a taint test with all images before applying to canvas
|
renderer: "Canvas"
|
};
|
|
options = _html2canvas.Util.Extend(opts, options);
|
|
_html2canvas.logging = options.logging;
|
options.complete = function( images ) {
|
|
if (typeof options.onpreloaded === "function") {
|
if ( options.onpreloaded( images ) === false ) {
|
return;
|
}
|
}
|
queue = _html2canvas.Parse( images, options );
|
|
if (typeof options.onparsed === "function") {
|
if ( options.onparsed( queue ) === false ) {
|
return;
|
}
|
}
|
|
canvas = _html2canvas.Renderer( queue, options );
|
|
if (typeof options.onrendered === "function") {
|
options.onrendered( canvas );
|
}
|
|
|
};
|
|
// for pages without images, we still want this to be async, i.e. return methods before executing
|
window.setTimeout( function(){
|
_html2canvas.Preload( options );
|
}, 0 );
|
|
return {
|
render: function( queue, opts ) {
|
return _html2canvas.Renderer( queue, _html2canvas.Util.Extend(opts, options) );
|
},
|
parse: function( images, opts ) {
|
return _html2canvas.Parse( images, _html2canvas.Util.Extend(opts, options) );
|
},
|
preload: function( opts ) {
|
return _html2canvas.Preload( _html2canvas.Util.Extend(opts, options) );
|
},
|
log: _html2canvas.Util.log
|
};
|
};
|
|
window.html2canvas.log = _html2canvas.Util.log; // for renderers
|
window.html2canvas.Renderer = {
|
Canvas: undefined // We are assuming this will be used
|
};
|
_html2canvas.Renderer.Canvas = function(options) {
|
options = options || {};
|
|
var doc = document,
|
safeImages = [],
|
testCanvas = document.createElement("canvas"),
|
testctx = testCanvas.getContext("2d"),
|
Util = _html2canvas.Util,
|
canvas = options.canvas || doc.createElement('canvas');
|
|
function createShape(ctx, args) {
|
ctx.beginPath();
|
args.forEach(function(arg) {
|
ctx[arg.name].apply(ctx, arg['arguments']);
|
});
|
ctx.closePath();
|
}
|
|
function safeImage(item) {
|
if (safeImages.indexOf(item['arguments'][0].src ) === -1) {
|
testctx.drawImage(item['arguments'][0], 0, 0);
|
try {
|
testctx.getImageData(0, 0, 1, 1);
|
} catch(e) {
|
testCanvas = doc.createElement("canvas");
|
testctx = testCanvas.getContext("2d");
|
return false;
|
}
|
safeImages.push(item['arguments'][0].src);
|
}
|
return true;
|
}
|
|
function renderItem(ctx, item) {
|
switch(item.type){
|
case "variable":
|
ctx[item.name] = item['arguments'];
|
break;
|
case "function":
|
switch(item.name) {
|
case "createPattern":
|
if (item['arguments'][0].width > 0 && item['arguments'][0].height > 0) {
|
try {
|
ctx.fillStyle = ctx.createPattern(item['arguments'][0], "repeat");
|
}
|
catch(e) {
|
Util.log("html2canvas: Renderer: Error creating pattern", e.message);
|
}
|
}
|
break;
|
case "drawShape":
|
createShape(ctx, item['arguments']);
|
break;
|
case "drawImage":
|
if (item['arguments'][8] > 0 && item['arguments'][7] > 0) {
|
if (!options.taintTest || (options.taintTest && safeImage(item))) {
|
ctx.drawImage.apply( ctx, item['arguments'] );
|
}
|
}
|
break;
|
default:
|
ctx[item.name].apply(ctx, item['arguments']);
|
}
|
break;
|
}
|
}
|
|
return function(parsedData, options, document, queue, _html2canvas) {
|
var ctx = canvas.getContext("2d"),
|
newCanvas,
|
bounds,
|
fstyle,
|
zStack = parsedData.stack;
|
|
canvas.width = canvas.style.width = options.width || zStack.ctx.width;
|
canvas.height = canvas.style.height = options.height || zStack.ctx.height;
|
|
fstyle = ctx.fillStyle;
|
ctx.fillStyle = (Util.isTransparent(zStack.backgroundColor) && options.background !== undefined) ? options.background : parsedData.backgroundColor;
|
ctx.fillRect(0, 0, canvas.width, canvas.height);
|
ctx.fillStyle = fstyle;
|
|
queue.forEach(function(storageContext) {
|
// set common settings for canvas
|
ctx.textBaseline = "bottom";
|
ctx.save();
|
|
if (storageContext.transform.matrix) {
|
ctx.translate(storageContext.transform.origin[0], storageContext.transform.origin[1]);
|
ctx.transform.apply(ctx, storageContext.transform.matrix);
|
ctx.translate(-storageContext.transform.origin[0], -storageContext.transform.origin[1]);
|
}
|
|
if (storageContext.clip){
|
ctx.beginPath();
|
ctx.rect(storageContext.clip.left, storageContext.clip.top, storageContext.clip.width, storageContext.clip.height);
|
ctx.clip();
|
}
|
|
if (storageContext.ctx.storage) {
|
storageContext.ctx.storage.forEach(function(item) {
|
renderItem(ctx, item);
|
});
|
}
|
|
ctx.restore();
|
});
|
|
Util.log("html2canvas: Renderer: Canvas renderer done - returning canvas obj");
|
|
if (options.elements.length === 1) {
|
if (typeof options.elements[0] === "object" && options.elements[0].nodeName !== "BODY") {
|
// crop image to the bounds of selected (single) element
|
bounds = _html2canvas.Util.Bounds(options.elements[0]);
|
newCanvas = document.createElement('canvas');
|
newCanvas.width = Math.ceil(bounds.width);
|
newCanvas.height = Math.ceil(bounds.height);
|
ctx = newCanvas.getContext("2d");
|
|
ctx.drawImage(canvas, bounds.left, bounds.top, bounds.width, bounds.height, 0, 0, bounds.width, bounds.height);
|
canvas = null;
|
return newCanvas;
|
}
|
}
|
|
return canvas;
|
};
|
};
|
})(window,document);
|
