dom-to-image文件
สคริปต์นี้ไม่ควรถูกติดตั้งโดยตรง มันเป็นคลังสำหรับสคริปต์อื่น ๆ เพื่อบรรจุด้วยคำสั่งเมทา // @require https://update.greasyfork.org/scripts/448541/1074759/dom-to-imagejs.js
- (function (global) {
- 'use strict';
- var util = newUtil();
- var inliner = newInliner();
- var fontFaces = newFontFaces();
- var images = newImages();
- // Default impl options
- var defaultOptions = {
- // Default is to fail on error, no placeholder
- imagePlaceholder: undefined,
- // Default cache bust is false, it will use the cache
- cacheBust: false
- };
- var domtoimage = {
- toSvg: toSvg,
- toPng: toPng,
- toJpeg: toJpeg,
- toBlob: toBlob,
- toPixelData: toPixelData,
- impl: {
- fontFaces: fontFaces,
- images: images,
- util: util,
- inliner: inliner,
- options: {}
- }
- };
- if (typeof module !== 'undefined')
- module.exports = domtoimage;
- else
- global.domtoimage = domtoimage;
- /**
- * @param {Node} node - The DOM Node object to render
- * @param {Object} options - Rendering options
- * @param {Function} options.filter - Should return true if passed node should be included in the output
- * (excluding node means excluding it's children as well). Not called on the root node.
- * @param {String} options.bgcolor - color for the background, any valid CSS color value.
- * @param {Number} options.width - width to be applied to node before rendering.
- * @param {Number} options.height - height to be applied to node before rendering.
- * @param {Object} options.style - an object whose properties to be copied to node's style before rendering.
- * @param {Number} options.quality - a Number between 0 and 1 indicating image quality (applicable to JPEG only),
- defaults to 1.0.
- * @param {String} options.imagePlaceholder - dataURL to use as a placeholder for failed images, default behaviour is to fail fast on images we can't fetch
- * @param {Boolean} options.cacheBust - set to true to cache bust by appending the time to the request url
- * @return {Promise} - A promise that is fulfilled with a SVG image data URL
- * */
- function toSvg(node, options) {
- options = options || {};
- copyOptions(options);
- return Promise.resolve(node)
- .then(function (node) {
- return cloneNode(node, options.filter, true);
- })
- .then(embedFonts)
- .then(inlineImages)
- .then(applyOptions)
- .then(function (clone) {
- return makeSvgDataUri(clone,
- options.width || util.width(node),
- options.height || util.height(node)
- );
- });
- function applyOptions(clone) {
- if (options.bgcolor) clone.style.backgroundColor = options.bgcolor;
- if (options.width) clone.style.width = options.width + 'px';
- if (options.height) clone.style.height = options.height + 'px';
- if (options.style)
- Object.keys(options.style).forEach(function (property) {
- clone.style[property] = options.style[property];
- });
- return clone;
- }
- }
- /**
- * @param {Node} node - The DOM Node object to render
- * @param {Object} options - Rendering options, @see {@link toSvg}
- * @return {Promise} - A promise that is fulfilled with a Uint8Array containing RGBA pixel data.
- * */
- function toPixelData(node, options) {
- return draw(node, options || {})
- .then(function (canvas) {
- return canvas.getContext('2d').getImageData(
- 0,
- 0,
- util.width(node),
- util.height(node)
- ).data;
- });
- }
- /**
- * @param {Node} node - The DOM Node object to render
- * @param {Object} options - Rendering options, @see {@link toSvg}
- * @return {Promise} - A promise that is fulfilled with a PNG image data URL
- * */
- function toPng(node, options) {
- return draw(node, options || {})
- .then(function (canvas) {
- return canvas.toDataURL();
- });
- }
- /**
- * @param {Node} node - The DOM Node object to render
- * @param {Object} options - Rendering options, @see {@link toSvg}
- * @return {Promise} - A promise that is fulfilled with a JPEG image data URL
- * */
- function toJpeg(node, options) {
- options = options || {};
- return draw(node, options)
- .then(function (canvas) {
- return canvas.toDataURL('image/jpeg', options.quality || 1.0);
- });
- }
- /**
- * @param {Node} node - The DOM Node object to render
- * @param {Object} options - Rendering options, @see {@link toSvg}
- * @return {Promise} - A promise that is fulfilled with a PNG image blob
- * */
- function toBlob(node, options) {
- return draw(node, options || {})
- .then(util.canvasToBlob);
- }
- function copyOptions(options) {
- // Copy options to impl options for use in impl
- if(typeof(options.imagePlaceholder) === 'undefined') {
- domtoimage.impl.options.imagePlaceholder = defaultOptions.imagePlaceholder;
- } else {
- domtoimage.impl.options.imagePlaceholder = options.imagePlaceholder;
- }
- if(typeof(options.cacheBust) === 'undefined') {
- domtoimage.impl.options.cacheBust = defaultOptions.cacheBust;
- } else {
- domtoimage.impl.options.cacheBust = options.cacheBust;
- }
- }
- function draw(domNode, options) {
- return toSvg(domNode, options)
- .then(util.makeImage)
- .then(util.delay(100))
- .then(function (image) {
- var canvas = newCanvas(domNode);
- canvas.getContext('2d').drawImage(image, 0, 0);
- return canvas;
- });
- function newCanvas(domNode) {
- var canvas = document.createElement('canvas');
- canvas.width = options.width || util.width(domNode);
- canvas.height = options.height || util.height(domNode);
- if (options.bgcolor) {
- var ctx = canvas.getContext('2d');
- ctx.fillStyle = options.bgcolor;
- ctx.fillRect(0, 0, canvas.width, canvas.height);
- }
- return canvas;
- }
- }
- function cloneNode(node, filter, root) {
- if (!root && filter && !filter(node)) return Promise.resolve();
- return Promise.resolve(node)
- .then(makeNodeCopy)
- .then(function (clone) {
- return cloneChildren(node, clone, filter);
- })
- .then(function (clone) {
- return processClone(node, clone);
- });
- function makeNodeCopy(node) {
- if (node instanceof HTMLCanvasElement) return util.makeImage(node.toDataURL());
- return node.cloneNode(false);
- }
- function cloneChildren(original, clone, filter) {
- var children = original.childNodes;
- if (children.length === 0) return Promise.resolve(clone);
- return cloneChildrenInOrder(clone, util.asArray(children), filter)
- .then(function () {
- return clone;
- });
- function cloneChildrenInOrder(parent, children, filter) {
- var done = Promise.resolve();
- children.forEach(function (child) {
- done = done
- .then(function () {
- return cloneNode(child, filter);
- })
- .then(function (childClone) {
- if (childClone) parent.appendChild(childClone);
- });
- });
- return done;
- }
- }
- function processClone(original, clone) {
- if (!(clone instanceof Element)) return clone;
- return Promise.resolve()
- .then(cloneStyle)
- .then(clonePseudoElements)
- .then(copyUserInput)
- .then(fixSvg)
- .then(function () {
- return clone;
- });
- function cloneStyle() {
- copyStyle(window.getComputedStyle(original), clone.style);
- function copyStyle(source, target) {
- if (source.cssText) target.cssText = source.cssText;
- else copyProperties(source, target);
- function copyProperties(source, target) {
- util.asArray(source).forEach(function (name) {
- target.setProperty(
- name,
- source.getPropertyValue(name),
- source.getPropertyPriority(name)
- );
- });
- }
- }
- }
- function clonePseudoElements() {
- [':before', ':after'].forEach(function (element) {
- clonePseudoElement(element);
- });
- function clonePseudoElement(element) {
- var style = window.getComputedStyle(original, element);
- var content = style.getPropertyValue('content');
- if (content === '' || content === 'none') return;
- var className = util.uid();
- clone.className = clone.className + ' ' + className;
- var styleElement = document.createElement('style');
- styleElement.appendChild(formatPseudoElementStyle(className, element, style));
- clone.appendChild(styleElement);
- function formatPseudoElementStyle(className, element, style) {
- var selector = '.' + className + ':' + element;
- var cssText = style.cssText ? formatCssText(style) : formatCssProperties(style);
- return document.createTextNode(selector + '{' + cssText + '}');
- function formatCssText(style) {
- var content = style.getPropertyValue('content');
- return style.cssText + ' content: ' + content + ';';
- }
- function formatCssProperties(style) {
- return util.asArray(style)
- .map(formatProperty)
- .join('; ') + ';';
- function formatProperty(name) {
- return name + ': ' +
- style.getPropertyValue(name) +
- (style.getPropertyPriority(name) ? ' !important' : '');
- }
- }
- }
- }
- }
- function copyUserInput() {
- if (original instanceof HTMLTextAreaElement) clone.innerHTML = original.value;
- if (original instanceof HTMLInputElement) clone.setAttribute("value", original.value);
- }
- function fixSvg() {
- if (!(clone instanceof SVGElement)) return;
- clone.setAttribute('xmlns', 'http://www.w3.org/2000/svg');
- if (!(clone instanceof SVGRectElement)) return;
- ['width', 'height'].forEach(function (attribute) {
- var value = clone.getAttribute(attribute);
- if (!value) return;
- clone.style.setProperty(attribute, value);
- });
- }
- }
- }
- function embedFonts(node) {
- return fontFaces.resolveAll()
- .then(function (cssText) {
- var styleNode = document.createElement('style');
- node.appendChild(styleNode);
- styleNode.appendChild(document.createTextNode(cssText));
- return node;
- });
- }
- function inlineImages(node) {
- return images.inlineAll(node)
- .then(function () {
- return node;
- });
- }
- function makeSvgDataUri(node, width, height) {
- return Promise.resolve(node)
- .then(function (node) {
- node.setAttribute('xmlns', 'http://www.w3.org/1999/xhtml');
- return new XMLSerializer().serializeToString(node);
- })
- .then(util.escapeXhtml)
- .then(function (xhtml) {
- return '<foreignObject x="0" y="0" width="100%" height="100%">' + xhtml + '</foreignObject>';
- })
- .then(function (foreignObject) {
- return '<svg xmlns="http://www.w3.org/2000/svg" width="' + width + '" height="' + height + '">' +
- foreignObject + '</svg>';
- })
- .then(function (svg) {
- return 'data:image/svg+xml;charset=utf-8,' + svg;
- });
- }
- function newUtil() {
- return {
- escape: escape,
- parseExtension: parseExtension,
- mimeType: mimeType,
- dataAsUrl: dataAsUrl,
- isDataUrl: isDataUrl,
- canvasToBlob: canvasToBlob,
- resolveUrl: resolveUrl,
- getAndEncode: getAndEncode,
- uid: uid(),
- delay: delay,
- asArray: asArray,
- escapeXhtml: escapeXhtml,
- makeImage: makeImage,
- width: width,
- height: height
- };
- function mimes() {
- /*
- * Only WOFF and EOT mime types for fonts are 'real'
- * see http://www.iana.org/assignments/media-types/media-types.xhtml
- */
- var WOFF = 'application/font-woff';
- var JPEG = 'image/jpeg';
- return {
- 'woff': WOFF,
- 'woff2': WOFF,
- 'ttf': 'application/font-truetype',
- 'eot': 'application/vnd.ms-fontobject',
- 'png': 'image/png',
- 'jpg': JPEG,
- 'jpeg': JPEG,
- 'gif': 'image/gif',
- 'tiff': 'image/tiff',
- 'svg': 'image/svg+xml'
- };
- }
- function parseExtension(url) {
- var match = /\.([^\.\/]*?)$/g.exec(url);
- if (match) return match[1];
- else return '';
- }
- function mimeType(url) {
- var extension = parseExtension(url).toLowerCase();
- return mimes()[extension] || '';
- }
- function isDataUrl(url) {
- return url.search(/^(data:)/) !== -1;
- }
- function toBlob(canvas) {
- return new Promise(function (resolve) {
- var binaryString = window.atob(canvas.toDataURL().split(',')[1]);
- var length = binaryString.length;
- var binaryArray = new Uint8Array(length);
- for (var i = 0; i < length; i++)
- binaryArray[i] = binaryString.charCodeAt(i);
- resolve(new Blob([binaryArray], {
- type: 'image/png'
- }));
- });
- }
- function canvasToBlob(canvas) {
- if (canvas.toBlob)
- return new Promise(function (resolve) {
- canvas.toBlob(resolve);
- });
- return toBlob(canvas);
- }
- function resolveUrl(url, baseUrl) {
- var doc = document.implementation.createHTMLDocument();
- var base = doc.createElement('base');
- doc.head.appendChild(base);
- var a = doc.createElement('a');
- doc.body.appendChild(a);
- base.href = baseUrl;
- a.href = url;
- return a.href;
- }
- function uid() {
- var index = 0;
- return function () {
- return 'u' + fourRandomChars() + index++;
- function fourRandomChars() {
- /* see http://stackoverflow.com/a/6248722/2519373 */
- return ('0000' + (Math.random() * Math.pow(36, 4) << 0).toString(36)).slice(-4);
- }
- };
- }
- function makeImage(uri) {
- return new Promise(function (resolve, reject) {
- var image = new Image();
- image.onload = function () {
- resolve(image);
- };
- image.onerror = reject;
- image.src = uri;
- });
- }
- function getAndEncode(url) {
- var TIMEOUT = 30000;
- if(domtoimage.impl.options.cacheBust) {
- // Cache bypass so we dont have CORS issues with cached images
- // Source: https://developer.mozilla.org/en/docs/Web/API/XMLHttpRequest/Using_XMLHttpRequest#Bypassing_the_cache
- url += ((/\?/).test(url) ? "&" : "?") + (new Date()).getTime();
- }
- return new Promise(function (resolve) {
- var request = new XMLHttpRequest();
- request.onreadystatechange = done;
- request.ontimeout = timeout;
- request.responseType = 'blob';
- request.timeout = TIMEOUT;
- request.open('GET', url, true);
- request.send();
- var placeholder;
- if(domtoimage.impl.options.imagePlaceholder) {
- var split = domtoimage.impl.options.imagePlaceholder.split(/,/);
- if(split && split[1]) {
- placeholder = split[1];
- }
- }
- function done() {
- if (request.readyState !== 4) return;
- if (request.status !== 200) {
- if(placeholder) {
- resolve(placeholder);
- } else {
- fail('cannot fetch resource: ' + url + ', status: ' + request.status);
- }
- return;
- }
- var encoder = new FileReader();
- encoder.onloadend = function () {
- var content = encoder.r###lt.split(/,/)[1];
- resolve(content);
- };
- encoder.readAsDataURL(request.response);
- }
- function timeout() {
- if(placeholder) {
- resolve(placeholder);
- } else {
- fail('timeout of ' + TIMEOUT + 'ms occured while fetching resource: ' + url);
- }
- }
- function fail(message) {
- console.error(message);
- resolve('');
- }
- });
- }
- function dataAsUrl(content, type) {
- return 'data:' + type + ';base64,' + content;
- }
- function escape(string) {
- return string.replace(/([.*+?^${}()|\[\]\/\\])/g, '\\$1');
- }
- function delay(ms) {
- return function (arg) {
- return new Promise(function (resolve) {
- setTimeout(function () {
- resolve(arg);
- }, ms);
- });
- };
- }
- function asArray(arrayLike) {
- var array = [];
- var length = arrayLike.length;
- for (var i = 0; i < length; i++) array.push(arrayLike[i]);
- return array;
- }
- function escapeXhtml(string) {
- return string.replace(/#/g, '%23').replace(/\n/g, '%0A');
- }
- function width(node) {
- var leftBorder = px(node, 'border-left-width');
- var rightBorder = px(node, 'border-right-width');
- return node.scrollWidth + leftBorder + rightBorder;
- }
- function height(node) {
- var topBorder = px(node, 'border-top-width');
- var bottomBorder = px(node, 'border-bottom-width');
- return node.scrollHeight + topBorder + bottomBorder;
- }
- function px(node, styleProperty) {
- var value = window.getComputedStyle(node).getPropertyValue(styleProperty);
- return parseFloat(value.replace('px', ''));
- }
- }
- function newInliner() {
- var URL_REGEX = /url\(['"]?([^'"]+?)['"]?\)/g;
- return {
- inlineAll: inlineAll,
- shouldProcess: shouldProcess,
- impl: {
- readUrls: readUrls,
- inline: inline
- }
- };
- function shouldProcess(string) {
- return string.search(URL_REGEX) !== -1;
- }
- function readUrls(string) {
- var r###lt = [];
- var match;
- while ((match = URL_REGEX.exec(string)) !== null) {
- r###lt.push(match[1]);
- }
- return r###lt.filter(function (url) {
- return !util.isDataUrl(url);
- });
- }
- function inline(string, url, baseUrl, get) {
- return Promise.resolve(url)
- .then(function (url) {
- return baseUrl ? util.resolveUrl(url, baseUrl) : url;
- })
- .then(get || util.getAndEncode)
- .then(function (data) {
- return util.dataAsUrl(data, util.mimeType(url));
- })
- .then(function (dataUrl) {
- return string.replace(urlAsRegex(url), '$1' + dataUrl + '$3');
- });
- function urlAsRegex(url) {
- return new RegExp('(url\\([\'"]?)(' + util.escape(url) + ')([\'"]?\\))', 'g');
- }
- }
- function inlineAll(string, baseUrl, get) {
- if (nothingToInline()) return Promise.resolve(string);
- return Promise.resolve(string)
- .then(readUrls)
- .then(function (urls) {
- var done = Promise.resolve(string);
- urls.forEach(function (url) {
- done = done.then(function (string) {
- return inline(string, url, baseUrl, get);
- });
- });
- return done;
- });
- function nothingToInline() {
- return !shouldProcess(string);
- }
- }
- }
- function newFontFaces() {
- return {
- resolveAll: resolveAll,
- impl: {
- readAll: readAll
- }
- };
- function resolveAll() {
- return readAll(document)
- .then(function (webFonts) {
- return Promise.all(
- webFonts.map(function (webFont) {
- return webFont.resolve();
- })
- );
- })
- .then(function (cssStrings) {
- return cssStrings.join('\n');
- });
- }
- function readAll() {
- return Promise.resolve(util.asArray(document.styleSheets))
- .then(getCssRules)
- .then(selectWebFontRules)
- .then(function (rules) {
- return rules.map(newWebFont);
- });
- function selectWebFontRules(cssRules) {
- return cssRules
- .filter(function (rule) {
- return rule.type === CSSRule.FONT_FACE_RULE;
- })
- .filter(function (rule) {
- return inliner.shouldProcess(rule.style.getPropertyValue('src'));
- });
- }
- function getCssRules(styleSheets) {
- var cssRules = [];
- styleSheets.forEach(function (sheet) {
- try {
- util.asArray(sheet.cssRules || []).forEach(cssRules.push.bind(cssRules));
- } catch (e) {
- console.log('Error while reading CSS rules from ' + sheet.href, e.toString());
- }
- });
- return cssRules;
- }
- function newWebFont(webFontRule) {
- return {
- resolve: function resolve() {
- var baseUrl = (webFontRule.parentStyleSheet || {}).href;
- return inliner.inlineAll(webFontRule.cssText, baseUrl);
- },
- src: function () {
- return webFontRule.style.getPropertyValue('src');
- }
- };
- }
- }
- }
- function newImages() {
- return {
- inlineAll: inlineAll,
- impl: {
- newImage: newImage
- }
- };
- function newImage(element) {
- return {
- inline: inline
- };
- function inline(get) {
- if (util.isDataUrl(element.src)) return Promise.resolve();
- return Promise.resolve(element.src)
- .then(get || util.getAndEncode)
- .then(function (data) {
- return util.dataAsUrl(data, util.mimeType(element.src));
- })
- .then(function (dataUrl) {
- return new Promise(function (resolve, reject) {
- element.onload = resolve;
- element.onerror = reject;
- element.src = dataUrl;
- });
- });
- }
- }
- function inlineAll(node) {
- if (!(node instanceof Element)) return Promise.resolve(node);
- return inlineBackground(node)
- .then(function () {
- if (node instanceof HTMLImageElement)
- return newImage(node).inline();
- else
- return Promise.all(
- util.asArray(node.childNodes).map(function (child) {
- return inlineAll(child);
- })
- );
- });
- function inlineBackground(node) {
- var background = node.style.getPropertyValue('background');
- if (!background) return Promise.resolve(node);
- return inliner.inlineAll(background)
- .then(function (inlined) {
- node.style.setProperty(
- 'background',
- inlined,
- node.style.getPropertyPriority('background')
- );
- })
- .then(function () {
- return node;
- });
- }
- }
- }
- })(this);