mirror of
https://github.com/niklasvh/html2canvas.git
synced 2023-08-10 21:13:10 +03:00
Speed & accuracy improvements to pseudo element rendering.
Previously, pseudo elements would be processed as they were found in the DOM tree, which was an expensive operation as each element's computed :before and :after style was checked for 'content' styles. This commit traverses the user's stylesheets for :before and :after selectors, gathers the classes affected, selects all elements that likely have a pseudo element present, then checks computed style. If there is actually an element present, it is created but *not* appended to the DOM until after all elements have been processed. After all elements have been found and created, they are added to the DOM in a single batch, and the original pseudo elements are hidden in a single batch. This prevents the layout invalidation / relayout loop that was occuring previously, and in my tests speeds parsing by as much as 50% or more, depending on how many pseudo elements your page uses. Additionally, this commit contains a bugfix to the handling of ":before" pseudo elements; the browser effectively inserts them as the first child of the element, not before the element. This fixes a few rendering inconsistencies and complicated pages look almost perfect in my tests.
This commit is contained in:
MoyuScript
parent
11417a16f0
commit
b35d1e585b
@ -1041,28 +1041,35 @@ _html2canvas.Parse = function (images, options, cb) {
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body = doc.body,
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getCSS = Util.getCSS,
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pseudoHide = "___html2canvas___pseudoelement",
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hidePseudoElements = doc.createElement('style');
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hidePseudoElementsStyles = doc.createElement('style');
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hidePseudoElements.innerHTML = '.' + pseudoHide + '-before:before { content: "" !important; display: none !important; }' +
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'.' + pseudoHide + '-after:after { content: "" !important; display: none !important; }';
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hidePseudoElementsStyles.innerHTML = '.' + pseudoHide +
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'-parent:before { content: "" !important; display: none !important; }' +
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'.' + pseudoHide + '-parent:after { content: "" !important; display: none !important; }';
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body.appendChild(hidePseudoElements);
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body.appendChild(hidePseudoElementsStyles);
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images = images || {};
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init();
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function init() {
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var background = getCSS(document.documentElement, "backgroundColor"),
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transparentBackground = (Util.isTransparent(background) && element === document.body),
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stack = renderElement(element, null, false, transparentBackground);
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// create pseudo elements in a single pass to prevent synchronous layouts
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addPseudoElements(element);
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parseChildren(element, stack, null, function() {
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parseChildren(element, stack, function() {
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if (transparentBackground) {
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background = stack.backgroundColor;
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}
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removePseudoElements();
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Util.log('Done parsing, moving to Render.');
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body.removeChild(hidePseudoElements);
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cb({
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backgroundColor: background,
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stack: stack
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@ -1070,7 +1077,126 @@ _html2canvas.Parse = function (images, options, cb) {
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});
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}
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init();
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// Given a root element, find all pseudo elements below, create elements mocking pseudo element styles
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// so we can process them as normal elements, and hide the original pseudo elements so they don't interfere
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// with layout.
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function addPseudoElements(el) {
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// These are done in discrete steps to prevent a relayout loop caused by addClass() invalidating
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// layouts & getPseudoElement calling getComputedStyle.
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var jobs = [], classes = [];
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getPseudoElementClasses();
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findPseudoElements(el);
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runJobs();
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function getPseudoElementClasses(){
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var findPsuedoEls = /:before|:after/;
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var sheets = document.styleSheets;
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for (var i = 0, j = sheets.length; i < j; i++) {
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try {
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var rules = sheets[i].cssRules;
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for (var k = 0, l = rules.length; k < l; k++) {
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if(findPsuedoEls.test(rules[k].selectorText)) {
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classes.push(rules[k].selectorText);
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}
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}
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}
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catch(e) { // will throw security exception for style sheets loaded from external domains
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}
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}
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// Trim off the :after and :before (or ::after and ::before)
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for (i = 0, j = classes.length; i < j; i++) {
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classes[i] = classes[i].match(/(^[^:]*)/)[1];
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}
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}
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// Using the list of elements we know how pseudo el styles, create fake pseudo elements.
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function findPseudoElements(el) {
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var els = document.querySelectorAll(classes.join(','));
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for(var i = 0, j = els.length; i < j; i++) {
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createPseudoElements(els[i]);
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}
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}
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// Create pseudo elements & add them to a job queue.
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function createPseudoElements(el) {
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var before = getPseudoElement(el, ':before'),
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after = getPseudoElement(el, ':after');
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if(before) {
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jobs.push({type: 'before', pseudo: before, el: el});
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}
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if (after) {
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jobs.push({type: 'after', pseudo: after, el: el});
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}
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}
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// Adds a class to the pseudo's parent to prevent the original before/after from messing
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// with layouts.
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// Execute the inserts & addClass() calls in a batch to prevent relayouts.
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function runJobs() {
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// Add Class
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jobs.forEach(function(job){
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addClass(job.el, pseudoHide + "-parent");
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});
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// Insert el
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jobs.forEach(function(job){
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if(job.type === 'before'){
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job.el.insertBefore(job.pseudo, job.el.firstChild);
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} else {
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job.el.appendChild(job.pseudo);
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}
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});
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}
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}
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// Delete our fake pseudo elements from the DOM. This will remove those actual elements
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// and the classes on their parents that hide the actual pseudo elements.
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// Note that NodeLists are 'live' collections so you can't use a for loop here. They are
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// actually deleted from the NodeList after each iteration.
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function removePseudoElements(){
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// delete pseudo elements
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body.removeChild(hidePseudoElementsStyles);
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var pseudos = document.getElementsByClassName(pseudoHide + "-element");
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while (pseudos.length) {
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pseudos[0].parentNode.removeChild(pseudos[0]);
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}
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// Remove pseudo hiding classes
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var parents = document.getElementsByClassName(pseudoHide + "-parent");
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while(parents.length) {
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removeClass(parents[0], pseudoHide + "-parent");
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}
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}
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function addClass (el, className) {
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if (el.classList) {
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el.classList.add(className);
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} else {
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el.className = el.className + " " + className;
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}
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}
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function removeClass (el, className) {
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if (el.classList) {
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el.classList.remove(className);
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} else {
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el.className = el.className.replace(className, "").trim();
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}
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}
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function hasClass (el, className) {
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return el.className.indexOf(className) > -1;
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}
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// Note that this doesn't work in < IE8, but we don't support that anyhow
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function nodeListToArray (nodeList) {
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return Array.prototype.slice.call(nodeList);
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}
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function documentWidth () {
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return Math.max(
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@ -1831,20 +1957,25 @@ _html2canvas.Parse = function (images, options, cb) {
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function getPseudoElement(el, which) {
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var elStyle = window.getComputedStyle(el, which);
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if(!elStyle || !elStyle.content || elStyle.content === "none" || elStyle.content === "-moz-alt-content" || elStyle.display === "none") {
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var parentStyle = window.getComputedStyle(el);
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// If no content attribute is present, the pseudo element is hidden,
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// or the parent has a content property equal to the content on the pseudo element,
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// move along.
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if(!elStyle || !elStyle.content || elStyle.content === "none" || elStyle.content === "-moz-alt-content" ||
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elStyle.display === "none" || parentStyle.content === elStyle.content) {
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return;
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}
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var content = elStyle.content + '',
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first = content.substr( 0, 1 );
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//strips quotes
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if(first === content.substr( content.length - 1 ) && first.match(/'|"/)) {
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content = content.substr( 1, content.length - 2 );
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var content = elStyle.content + '';
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// Strip inner quotes
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if(content[0] === "'" || content[0] === "\"") {
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content = content.replace(/(^['"])|(['"]$)/g, '');
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}
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var isImage = content.substr( 0, 3 ) === 'url',
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elps = document.createElement( isImage ? 'img' : 'span' );
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elps.className = pseudoHide + "-before " + pseudoHide + "-after";
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elps.className = pseudoHide + "-element ";
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Object.keys(elStyle).filter(indexedProperty).forEach(function(prop) {
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// Prevent assigning of read only CSS Rules, ex. length, parentRule
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@ -1867,31 +1998,6 @@ _html2canvas.Parse = function (images, options, cb) {
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return (isNaN(window.parseInt(property, 10)));
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}
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function injectPseudoElements(el, stack) {
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var before = getPseudoElement(el, ':before'),
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after = getPseudoElement(el, ':after');
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if(!before && !after) {
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return;
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}
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if(before) {
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el.className += " " + pseudoHide + "-before";
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el.parentNode.insertBefore(before, el);
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parseElement(before, stack, true);
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el.parentNode.removeChild(before);
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el.className = el.className.replace(pseudoHide + "-before", "").trim();
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}
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if (after) {
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el.className += " " + pseudoHide + "-after";
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el.appendChild(after);
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parseElement(after, stack, true);
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el.removeChild(after);
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el.className = el.className.replace(pseudoHide + "-after", "").trim();
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}
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}
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function renderBackgroundRepeat(ctx, image, backgroundPosition, bounds) {
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var offsetX = Math.round(bounds.left + backgroundPosition.left),
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offsetY = Math.round(bounds.top + backgroundPosition.top);
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@ -2079,7 +2185,7 @@ _html2canvas.Parse = function (images, options, cb) {
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return bounds;
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}
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function renderElement(element, parentStack, pseudoElement, ignoreBackground) {
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function renderElement(element, parentStack, ignoreBackground) {
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var transform = getTransform(element, parentStack),
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bounds = getBounds(element, transform),
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image,
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@ -2109,10 +2215,6 @@ _html2canvas.Parse = function (images, options, cb) {
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renderBorders(ctx, border.args, border.color);
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});
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if (!pseudoElement) {
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injectPseudoElements(element, stack);
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}
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switch(element.nodeName){
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case "IMG":
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if ((image = loadImage(element.getAttribute('src')))) {
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@ -2153,20 +2255,20 @@ _html2canvas.Parse = function (images, options, cb) {
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return (getCSS(element, 'display') !== "none" && getCSS(element, 'visibility') !== "hidden" && !element.hasAttribute("data-html2canvas-ignore"));
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}
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function parseElement (element, stack, pseudoElement, cb) {
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function parseElement (element, stack, cb) {
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if (!cb) {
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cb = function(){};
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}
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if (isElementVisible(element)) {
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stack = renderElement(element, stack, pseudoElement, false) || stack;
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stack = renderElement(element, stack, false) || stack;
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if (!ignoreElementsRegExp.test(element.nodeName)) {
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return parseChildren(element, stack, pseudoElement, cb);
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return parseChildren(element, stack, cb);
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}
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}
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cb();
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}
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function parseChildren(element, stack, pseudoElement, cb) {
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function parseChildren(element, stack, cb) {
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var children = Util.Children(element);
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// After all nodes have processed, finished() will call the cb.
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// We add one and kick it off so this will still work when children.length === 0.
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@ -2185,7 +2287,7 @@ _html2canvas.Parse = function (images, options, cb) {
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function parseNode(node) {
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if (node.nodeType === node.ELEMENT_NODE) {
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parseElement(node, stack, pseudoElement, finished);
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parseElement(node, stack, finished);
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} else if (node.nodeType === node.TEXT_NODE) {
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renderText(element, node, stack);
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finished();
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@ -2706,9 +2808,9 @@ window.html2canvas = function(elements, opts) {
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useOverflow: true,
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letterRendering: false,
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chinese: false,
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async: false, // If true, parsing will not block, but if the user scrolls during parse the image can get weird
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// render options
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width: null,
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height: null,
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taintTest: true, // do a taint test with all images before applying to canvas
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4
build/html2canvas.min.js
vendored
4
build/html2canvas.min.js
vendored
File diff suppressed because one or more lines are too long
200
src/Parse.js
200
src/Parse.js
@ -10,28 +10,35 @@ _html2canvas.Parse = function (images, options, cb) {
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body = doc.body,
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getCSS = Util.getCSS,
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pseudoHide = "___html2canvas___pseudoelement",
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hidePseudoElements = doc.createElement('style');
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hidePseudoElementsStyles = doc.createElement('style');
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hidePseudoElements.innerHTML = '.' + pseudoHide + '-before:before { content: "" !important; display: none !important; }' +
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'.' + pseudoHide + '-after:after { content: "" !important; display: none !important; }';
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hidePseudoElementsStyles.innerHTML = '.' + pseudoHide +
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'-parent:before { content: "" !important; display: none !important; }' +
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'.' + pseudoHide + '-parent:after { content: "" !important; display: none !important; }';
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body.appendChild(hidePseudoElements);
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body.appendChild(hidePseudoElementsStyles);
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images = images || {};
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init();
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function init() {
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var background = getCSS(document.documentElement, "backgroundColor"),
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transparentBackground = (Util.isTransparent(background) && element === document.body),
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stack = renderElement(element, null, false, transparentBackground);
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// create pseudo elements in a single pass to prevent synchronous layouts
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addPseudoElements(element);
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parseChildren(element, stack, null, function() {
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parseChildren(element, stack, function() {
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if (transparentBackground) {
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background = stack.backgroundColor;
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}
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removePseudoElements();
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Util.log('Done parsing, moving to Render.');
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body.removeChild(hidePseudoElements);
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cb({
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backgroundColor: background,
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stack: stack
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@ -39,7 +46,126 @@ _html2canvas.Parse = function (images, options, cb) {
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});
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}
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init();
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// Given a root element, find all pseudo elements below, create elements mocking pseudo element styles
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// so we can process them as normal elements, and hide the original pseudo elements so they don't interfere
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// with layout.
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function addPseudoElements(el) {
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// These are done in discrete steps to prevent a relayout loop caused by addClass() invalidating
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// layouts & getPseudoElement calling getComputedStyle.
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var jobs = [], classes = [];
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getPseudoElementClasses();
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findPseudoElements(el);
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runJobs();
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function getPseudoElementClasses(){
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var findPsuedoEls = /:before|:after/;
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var sheets = document.styleSheets;
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for (var i = 0, j = sheets.length; i < j; i++) {
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try {
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var rules = sheets[i].cssRules;
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for (var k = 0, l = rules.length; k < l; k++) {
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if(findPsuedoEls.test(rules[k].selectorText)) {
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classes.push(rules[k].selectorText);
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}
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}
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}
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catch(e) { // will throw security exception for style sheets loaded from external domains
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}
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}
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// Trim off the :after and :before (or ::after and ::before)
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for (i = 0, j = classes.length; i < j; i++) {
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classes[i] = classes[i].match(/(^[^:]*)/)[1];
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}
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}
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// Using the list of elements we know how pseudo el styles, create fake pseudo elements.
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function findPseudoElements(el) {
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var els = document.querySelectorAll(classes.join(','));
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for(var i = 0, j = els.length; i < j; i++) {
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createPseudoElements(els[i]);
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}
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}
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// Create pseudo elements & add them to a job queue.
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function createPseudoElements(el) {
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var before = getPseudoElement(el, ':before'),
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after = getPseudoElement(el, ':after');
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if(before) {
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jobs.push({type: 'before', pseudo: before, el: el});
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}
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if (after) {
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jobs.push({type: 'after', pseudo: after, el: el});
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}
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}
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// Adds a class to the pseudo's parent to prevent the original before/after from messing
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// with layouts.
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// Execute the inserts & addClass() calls in a batch to prevent relayouts.
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function runJobs() {
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// Add Class
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jobs.forEach(function(job){
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addClass(job.el, pseudoHide + "-parent");
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});
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// Insert el
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jobs.forEach(function(job){
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if(job.type === 'before'){
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job.el.insertBefore(job.pseudo, job.el.firstChild);
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} else {
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job.el.appendChild(job.pseudo);
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}
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});
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}
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}
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// Delete our fake pseudo elements from the DOM. This will remove those actual elements
|
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// and the classes on their parents that hide the actual pseudo elements.
|
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// Note that NodeLists are 'live' collections so you can't use a for loop here. They are
|
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// actually deleted from the NodeList after each iteration.
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function removePseudoElements(){
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// delete pseudo elements
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body.removeChild(hidePseudoElementsStyles);
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var pseudos = document.getElementsByClassName(pseudoHide + "-element");
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while (pseudos.length) {
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pseudos[0].parentNode.removeChild(pseudos[0]);
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}
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// Remove pseudo hiding classes
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var parents = document.getElementsByClassName(pseudoHide + "-parent");
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while(parents.length) {
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removeClass(parents[0], pseudoHide + "-parent");
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}
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}
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function addClass (el, className) {
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if (el.classList) {
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el.classList.add(className);
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} else {
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el.className = el.className + " " + className;
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}
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}
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|
||||
function removeClass (el, className) {
|
||||
if (el.classList) {
|
||||
el.classList.remove(className);
|
||||
} else {
|
||||
el.className = el.className.replace(className, "").trim();
|
||||
}
|
||||
}
|
||||
|
||||
function hasClass (el, className) {
|
||||
return el.className.indexOf(className) > -1;
|
||||
}
|
||||
|
||||
// Note that this doesn't work in < IE8, but we don't support that anyhow
|
||||
function nodeListToArray (nodeList) {
|
||||
return Array.prototype.slice.call(nodeList);
|
||||
}
|
||||
|
||||
function documentWidth () {
|
||||
return Math.max(
|
||||
@ -800,20 +926,25 @@ _html2canvas.Parse = function (images, options, cb) {
|
||||
|
||||
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") {
|
||||
var parentStyle = window.getComputedStyle(el);
|
||||
// If no content attribute is present, the pseudo element is hidden,
|
||||
// or the parent has a content property equal to the content on the pseudo element,
|
||||
// move along.
|
||||
if(!elStyle || !elStyle.content || elStyle.content === "none" || elStyle.content === "-moz-alt-content" ||
|
||||
elStyle.display === "none" || parentStyle.content === elStyle.content) {
|
||||
return;
|
||||
}
|
||||
var content = elStyle.content + '',
|
||||
first = content.substr( 0, 1 );
|
||||
//strips quotes
|
||||
if(first === content.substr( content.length - 1 ) && first.match(/'|"/)) {
|
||||
content = content.substr( 1, content.length - 2 );
|
||||
var content = elStyle.content + '';
|
||||
|
||||
// Strip inner quotes
|
||||
if(content[0] === "'" || content[0] === "\"") {
|
||||
content = content.replace(/(^['"])|(['"]$)/g, '');
|
||||
}
|
||||
|
||||
var isImage = content.substr( 0, 3 ) === 'url',
|
||||
elps = document.createElement( isImage ? 'img' : 'span' );
|
||||
|
||||
elps.className = pseudoHide + "-before " + pseudoHide + "-after";
|
||||
elps.className = pseudoHide + "-element ";
|
||||
|
||||
Object.keys(elStyle).filter(indexedProperty).forEach(function(prop) {
|
||||
// Prevent assigning of read only CSS Rules, ex. length, parentRule
|
||||
@ -836,31 +967,6 @@ _html2canvas.Parse = function (images, options, cb) {
|
||||
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);
|
||||
@ -1048,7 +1154,7 @@ _html2canvas.Parse = function (images, options, cb) {
|
||||
return bounds;
|
||||
}
|
||||
|
||||
function renderElement(element, parentStack, pseudoElement, ignoreBackground) {
|
||||
function renderElement(element, parentStack, ignoreBackground) {
|
||||
var transform = getTransform(element, parentStack),
|
||||
bounds = getBounds(element, transform),
|
||||
image,
|
||||
@ -1078,10 +1184,6 @@ _html2canvas.Parse = function (images, options, cb) {
|
||||
renderBorders(ctx, border.args, border.color);
|
||||
});
|
||||
|
||||
if (!pseudoElement) {
|
||||
injectPseudoElements(element, stack);
|
||||
}
|
||||
|
||||
switch(element.nodeName){
|
||||
case "IMG":
|
||||
if ((image = loadImage(element.getAttribute('src')))) {
|
||||
@ -1122,20 +1224,20 @@ _html2canvas.Parse = function (images, options, cb) {
|
||||
return (getCSS(element, 'display') !== "none" && getCSS(element, 'visibility') !== "hidden" && !element.hasAttribute("data-html2canvas-ignore"));
|
||||
}
|
||||
|
||||
function parseElement (element, stack, pseudoElement, cb) {
|
||||
function parseElement (element, stack, cb) {
|
||||
if (!cb) {
|
||||
cb = function(){};
|
||||
}
|
||||
if (isElementVisible(element)) {
|
||||
stack = renderElement(element, stack, pseudoElement, false) || stack;
|
||||
stack = renderElement(element, stack, false) || stack;
|
||||
if (!ignoreElementsRegExp.test(element.nodeName)) {
|
||||
return parseChildren(element, stack, pseudoElement, cb);
|
||||
return parseChildren(element, stack, cb);
|
||||
}
|
||||
}
|
||||
cb();
|
||||
}
|
||||
|
||||
function parseChildren(element, stack, pseudoElement, cb) {
|
||||
function parseChildren(element, stack, cb) {
|
||||
var children = Util.Children(element);
|
||||
// After all nodes have processed, finished() will call the cb.
|
||||
// We add one and kick it off so this will still work when children.length === 0.
|
||||
@ -1154,7 +1256,7 @@ _html2canvas.Parse = function (images, options, cb) {
|
||||
|
||||
function parseNode(node) {
|
||||
if (node.nodeType === node.ELEMENT_NODE) {
|
||||
parseElement(node, stack, pseudoElement, finished);
|
||||
parseElement(node, stack, finished);
|
||||
} else if (node.nodeType === node.TEXT_NODE) {
|
||||
renderText(element, node, stack);
|
||||
finished();
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user