817 lines
23 KiB
JavaScript
817 lines
23 KiB
JavaScript
;(function (global) {
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"use strict"
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var util = newUtil()
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var inliner = newInliner()
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var fontFaces = newFontFaces()
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var images = newImages()
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// Default impl options
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var defaultOptions = {
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// Default is to fail on error, no placeholder
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imagePlaceholder: undefined,
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// Default cache bust is false, it will use the cache
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cacheBust: false
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}
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var domtoimage = {
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toSvg: toSvg,
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toPng: toPng,
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toJpeg: toJpeg,
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toBlob: toBlob,
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toPixelData: toPixelData,
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impl: {
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fontFaces: fontFaces,
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images: images,
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util: util,
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inliner: inliner,
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options: {}
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}
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}
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global.domtoimage = domtoimage
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/**
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* @param {Node} node - The DOM Node object to render
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* @param {Object} options - Rendering options
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* @param {Function} options.filter - Should return true if passed node should be included in the output
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* (excluding node means excluding it's children as well). Not called on the root node.
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* @param {String} options.bgcolor - color for the background, any valid CSS color value.
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* @param {Number} options.width - width to be applied to node before rendering.
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* @param {Number} options.height - height to be applied to node before rendering.
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* @param {Object} options.style - an object whose properties to be copied to node's style before rendering.
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* @param {Number} options.quality - a Number between 0 and 1 indicating image quality (applicable to JPEG only),
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defaults to 1.0.
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* @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
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* @param {Boolean} options.cacheBust - set to true to cache bust by appending the time to the request url
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* @return {Promise} - A promise that is fulfilled with a SVG image data URL
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* */
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function toSvg(node, options) {
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options = options || {}
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copyOptions(options)
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return Promise.resolve(node)
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.then(function (node) {
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return cloneNode(node, options.filter, true)
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})
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.then(embedFonts)
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.then(inlineImages)
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.then(applyOptions)
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.then(function (clone) {
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return makeSvgDataUri(clone, options.width || util.width(node), options.height || util.height(node))
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})
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function applyOptions(clone) {
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if (options.bgcolor) {
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clone.style.backgroundColor = options.bgcolor
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}
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if (options.width) {
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clone.style.width = options.width + "px"
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}
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if (options.height) {
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clone.style.height = options.height + "px"
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}
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if (options.style) {
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Object.keys(options.style).forEach(function (property) {
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clone.style[property] = options.style[property]
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})
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}
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return clone
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}
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}
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/**
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* @param {Node} node - The DOM Node object to render
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* @param {Object} options - Rendering options, @see {@link toSvg}
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* @return {Promise} - A promise that is fulfilled with a Uint8Array containing RGBA pixel data.
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* */
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function toPixelData(node, options) {
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return draw(node, options || {}).then(function (canvas) {
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return canvas.getContext("2d").getImageData(0, 0, util.width(node), util.height(node)).data
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})
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}
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/**
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* @param {Node} node - The DOM Node object to render
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* @param {Object} options - Rendering options, @see {@link toSvg}
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* @return {Promise} - A promise that is fulfilled with a PNG image data URL
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* */
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function toPng(node, options) {
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return draw(node, options || {}).then(function (canvas) {
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return canvas.toDataURL()
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})
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}
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/**
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* @param {Node} node - The DOM Node object to render
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* @param {Object} options - Rendering options, @see {@link toSvg}
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* @return {Promise} - A promise that is fulfilled with a JPEG image data URL
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* */
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function toJpeg(node, options) {
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options = options || {}
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return draw(node, options).then(function (canvas) {
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return canvas.toDataURL("image/jpeg", options.quality || 1.0)
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})
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}
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/**
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* @param {Node} node - The DOM Node object to render
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* @param {Object} options - Rendering options, @see {@link toSvg}
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* @return {Promise} - A promise that is fulfilled with a PNG image blob
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* */
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function toBlob(node, options) {
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return draw(node, options || {}).then(util.canvasToBlob)
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}
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function copyOptions(options) {
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// Copy options to impl options for use in impl
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if (typeof options.imagePlaceholder === "undefined") {
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domtoimage.impl.options.imagePlaceholder = defaultOptions.imagePlaceholder
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} else {
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domtoimage.impl.options.imagePlaceholder = options.imagePlaceholder
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}
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if (typeof options.cacheBust === "undefined") {
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domtoimage.impl.options.cacheBust = defaultOptions.cacheBust
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} else {
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domtoimage.impl.options.cacheBust = options.cacheBust
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}
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}
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function draw(domNode, options) {
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return toSvg(domNode, options)
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.then(util.makeImage)
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.then(util.delay(100))
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.then(function (image) {
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var canvas = newCanvas(domNode)
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canvas.getContext("2d").drawImage(image, 0, 0)
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return canvas
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})
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function newCanvas(domNode) {
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var canvas = document.createElement("canvas")
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canvas.width = options.width || util.width(domNode)
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canvas.height = options.height || util.height(domNode)
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if (options.bgcolor) {
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var ctx = canvas.getContext("2d")
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ctx.fillStyle = options.bgcolor
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ctx.fillRect(0, 0, canvas.width, canvas.height)
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}
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return canvas
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}
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}
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function cloneNode(node, filter, root) {
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if (!root && filter && !filter(node)) {
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return Promise.resolve()
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}
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return Promise.resolve(node)
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.then(makeNodeCopy)
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.then(function (clone) {
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return cloneChildren(node, clone, filter)
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})
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.then(function (clone) {
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return processClone(node, clone)
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})
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function makeNodeCopy(node) {
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if (node instanceof HTMLCanvasElement) {
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return util.makeImage(node.toDataURL())
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}
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return node.cloneNode(false)
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}
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function cloneChildren(original, clone, filter) {
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var children = original.childNodes
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if (children.length === 0) {
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return Promise.resolve(clone)
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}
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return cloneChildrenInOrder(clone, util.asArray(children), filter).then(function () {
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return clone
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})
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function cloneChildrenInOrder(parent, children, filter) {
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var done = Promise.resolve()
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children.forEach(function (child) {
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done = done
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.then(function () {
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return cloneNode(child, filter)
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})
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.then(function (childClone) {
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if (childClone) {
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parent.appendChild(childClone)
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}
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})
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})
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return done
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}
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}
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function processClone(original, clone) {
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if (!(clone instanceof Element)) {
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return clone
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}
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return Promise.resolve()
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.then(cloneStyle)
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.then(clonePseudoElements)
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.then(copyUserInput)
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.then(fixSvg)
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.then(function () {
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return clone
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})
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function cloneStyle() {
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copyStyle(window.getComputedStyle(original), clone.style)
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function copyStyle(source, target) {
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if (source.cssText) {
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target.cssText = source.cssText
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} else {
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copyProperties(source, target)
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}
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function copyProperties(source, target) {
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util.asArray(source).forEach(function (name) {
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target.setProperty(name, source.getPropertyValue(name), source.getPropertyPriority(name))
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})
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}
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}
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}
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function clonePseudoElements() {
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;[":before", ":after"].forEach(function (element) {
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clonePseudoElement(element)
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})
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function clonePseudoElement(element) {
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var style = window.getComputedStyle(original, element)
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var content = style.getPropertyValue("content")
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if (content === "" || content === "none") {
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return
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}
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var className = util.uid()
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clone.className = clone.className + " " + className
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var styleElement = document.createElement("style")
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styleElement.appendChild(formatPseudoElementStyle(className, element, style))
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clone.appendChild(styleElement)
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function formatPseudoElementStyle(className, element, style) {
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var selector = "." + className + ":" + element
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var cssText = style.cssText ? formatCssText(style) : formatCssProperties(style)
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return document.createTextNode(selector + "{" + cssText + "}")
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function formatCssText(style) {
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var content = style.getPropertyValue("content")
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return style.cssText + " content: " + content + ";"
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}
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function formatCssProperties(style) {
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return util.asArray(style).map(formatProperty).join("; ") + ";"
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function formatProperty(name) {
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return name + ": " + style.getPropertyValue(name) + (style.getPropertyPriority(name) ? " !important" : "")
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}
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}
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}
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}
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}
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function copyUserInput() {
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if (original instanceof HTMLTextAreaElement) {
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clone.innerHTML = original.value
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}
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if (original instanceof HTMLInputElement) {
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clone.setAttribute("value", original.value)
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}
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}
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function fixSvg() {
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if (!(clone instanceof SVGElement)) {
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return
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}
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clone.setAttribute("xmlns", "http://www.w3.org/2000/svg")
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if (!(clone instanceof SVGRectElement)) {
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return
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}
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;["width", "height"].forEach(function (attribute) {
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var value = clone.getAttribute(attribute)
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if (!value) {
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return
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}
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clone.style.setProperty(attribute, value)
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})
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}
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}
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}
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function embedFonts(node) {
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return fontFaces.resolveAll().then(function (cssText) {
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var styleNode = document.createElement("style")
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node.appendChild(styleNode)
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styleNode.appendChild(document.createTextNode(cssText))
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return node
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})
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}
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function inlineImages(node) {
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return images.inlineAll(node).then(function () {
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return node
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})
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}
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function makeSvgDataUri(node, width, height) {
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return Promise.resolve(node)
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.then(function (node) {
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node.setAttribute("xmlns", "http://www.w3.org/1999/xhtml")
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return new XMLSerializer().serializeToString(node)
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})
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.then(util.escapeXhtml)
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.then(function (xhtml) {
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return '<foreignObject x="0" y="0" width="100%" height="100%">' + xhtml + "</foreignObject>"
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})
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.then(function (foreignObject) {
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return '<svg xmlns="http://www.w3.org/2000/svg" width="' + width + '" height="' + height + '">' + foreignObject + "</svg>"
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})
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.then(function (svg) {
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return "data:image/svg+xml;charset=utf-8," + svg
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})
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}
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function newUtil() {
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return {
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escape: escape,
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parseExtension: parseExtension,
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mimeType: mimeType,
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dataAsUrl: dataAsUrl,
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isDataUrl: isDataUrl,
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canvasToBlob: canvasToBlob,
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resolveUrl: resolveUrl,
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getAndEncode: getAndEncode,
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uid: uid(),
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delay: delay,
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asArray: asArray,
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escapeXhtml: escapeXhtml,
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makeImage: makeImage,
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width: width,
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height: height
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}
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function mimes() {
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/*
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* Only WOFF and EOT mime types for fonts are 'real'
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* see http://www.iana.org/assignments/media-types/media-types.xhtml
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*/
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var WOFF = "application/font-woff"
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var JPEG = "image/jpeg"
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return {
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woff: WOFF,
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woff2: WOFF,
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ttf: "application/font-truetype",
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eot: "application/vnd.ms-fontobject",
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png: "image/png",
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jpg: JPEG,
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jpeg: JPEG,
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gif: "image/gif",
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tiff: "image/tiff",
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svg: "image/svg+xml"
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}
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}
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function parseExtension(url) {
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var match = /\.([^\.\/]*?)$/g.exec(url)
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if (match) {
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return match[1]
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} else {
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return ""
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}
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}
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function mimeType(url) {
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var extension = parseExtension(url).toLowerCase()
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return mimes()[extension] || ""
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}
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function isDataUrl(url) {
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return url.search(/^(data:)/) !== -1
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}
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function toBlob(canvas) {
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return new Promise(function (resolve) {
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var binaryString = window.atob(canvas.toDataURL().split(",")[1])
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var length = binaryString.length
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var binaryArray = new Uint8Array(length)
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for (var i = 0; i < length; i++) {
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binaryArray[i] = binaryString.charCodeAt(i)
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}
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resolve(
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new Blob([binaryArray], {
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type: "image/png"
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})
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)
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})
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}
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function canvasToBlob(canvas) {
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if (canvas.toBlob) {
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return new Promise(function (resolve) {
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canvas.toBlob(resolve)
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})
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}
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return toBlob(canvas)
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}
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function resolveUrl(url, baseUrl) {
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var doc = document.implementation.createHTMLDocument()
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var base = doc.createElement("base")
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doc.head.appendChild(base)
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var a = doc.createElement("a")
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doc.body.appendChild(a)
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base.href = baseUrl
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a.href = url
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return a.href
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}
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function uid() {
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var index = 0
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return function () {
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return "u" + fourRandomChars() + index++
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function fourRandomChars() {
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/* see http://stackoverflow.com/a/6248722/2519373 */
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return ("0000" + ((Math.random() * Math.pow(36, 4)) << 0).toString(36)).slice(-4)
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}
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}
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}
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function makeImage(uri) {
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return new Promise(function (resolve, reject) {
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var image = new Image()
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image.crossOrigin = "*"
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image.onload = function () {
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resolve(image)
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}
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image.onerror = function (error) {
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console.log("makeImage图片生成失败", uri)
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reject(error)
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}
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image.src = uri
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})
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}
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function getAndEncode(url) {
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var TIMEOUT = 100000
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if (domtoimage.impl.options.cacheBust) {
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// Cache bypass so we dont have CORS issues with cached images
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// Source: https://developer.mozilla.org/en/docs/Web/API/XMLHttpRequest/Using_XMLHttpRequest#Bypassing_the_cache
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url += (/\?/.test(url) ? "&" : "?") + new Date().getTime()
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}
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//走代理，瓦片地图导出需要服务允许跨域
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if (url.startsWith("http") && url.indexOf(location.hostname) == -1) {
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if (domtoimage.proxy) {
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url = domtoimage.proxy(url) //回调方法，在该方法内部处理逻辑
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} else if (domtoimage.preUrl) {
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url = domtoimage.preUrl + url
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}
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}
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return new Promise(function (resolve) {
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var request = new XMLHttpRequest()
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request.onreadystatechange = done
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request.ontimeout = timeout
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request.responseType = "blob"
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request.timeout = TIMEOUT
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var getorpost
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if (url.indexOf(location.origin) != -1) {
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getorpost = "get"
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} else {
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getorpost = "post"
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}
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if (domtoimage.hasGet) {
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getorpost = domtoimage.hasGet(url, getorpost)
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}
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request.open(getorpost, url, true)
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//request.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
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request.send()
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var placeholder
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if (domtoimage.impl.options.imagePlaceholder) {
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var split = domtoimage.impl.options.imagePlaceholder.split(/,/)
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if (split && split[1]) {
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placeholder = split[1]
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}
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}
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function done() {
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if (request.readyState !== 4) {
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return
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}
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if (request.status !== 200) {
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//404错误
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if (placeholder) {
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resolve(placeholder)
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} else {
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fail("无法获取资源: " + url + ", 状态: " + request.status)
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}
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} else {
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var encoder = new FileReader()
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encoder.onloadend = function () {
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var content = encoder.result.split(/,/)[1]
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resolve(content)
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}
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encoder.readAsDataURL(request.response)
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}
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}
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function timeout() {
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if (placeholder) {
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resolve(placeholder)
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} else {
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fail("抓取资源时发生超时（" + TIMEOUT + "ms）: " + url)
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}
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}
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function fail(message) {
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console.log(message)
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resolve(
|
||
"iVBORw0KGgoAAAANSUhEUgAAAAEAAAABAQMAAAAl21bKAAAABlBMVEXMzMwAov9iAAKCAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAACklEQVQImWNgAAAAAgAB9HFkpgAAAABJRU5ErkJggg=="
|
||
)
|
||
}
|
||
})
|
||
}
|
||
|
||
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 result = []
|
||
var match
|
||
while ((match = URL_REGEX.exec(string)) !== null) {
|
||
result.push(match[1])
|
||
}
|
||
return result.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
|
||
})
|
||
}
|
||
}
|
||
}
|
||
})(window)
|