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carbon/api/customDomToImage.js

768 lines
22 KiB
JavaScript

/* eslint-disable */
;(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: {}
}
}
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.result.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 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
})
}
}
}
})(this)