overleaf/services/web/frontend/js/ide/pdfng/directives/pdfRenderer.js

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/* eslint-disable
node/handle-callback-err,
max-len,
new-cap,
no-return-assign,
no-unused-vars,
*/
// TODO: This file was created by bulk-decaffeinate.
// Fix any style issues and re-enable lint.
/*
* decaffeinate suggestions:
* DS101: Remove unnecessary use of Array.from
* DS102: Remove unnecessary code created because of implicit returns
* DS103: Rewrite code to no longer use __guard__
* DS205: Consider reworking code to avoid use of IIFEs
* DS206: Consider reworking classes to avoid initClass
* DS207: Consider shorter variations of null checks
* Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
*/
import App from '../../../base'
import PDFJS from './pdfJsLoader'
import { captureMessage } from '../../../infrastructure/error-reporter'
export default App.factory(
'PDFRenderer',
function ($timeout, pdfAnnotations, pdfTextLayer, pdfSpinner) {
let PDFRenderer
return (PDFRenderer = (function () {
PDFRenderer = class PDFRenderer {
static initClass() {
this.prototype.JOB_QUEUE_INTERVAL = 25
this.prototype.PAGE_LOAD_TIMEOUT = 60 * 1000
this.prototype.INDICATOR_DELAY1 = 100 // time to delay before showing the indicator
this.prototype.INDICATOR_DELAY2 = 250 // time until the indicator starts animating
this.prototype.TEXTLAYER_TIMEOUT = 100
}
constructor(url, options) {
// set up external character mappings - needed for Japanese etc
this.url = url
this.options = options
this.scale = this.options.scale || 1
let disableFontFace
if (
__guard__(
window.location != null ? window.location.search : undefined,
x => x.indexOf('disable-font-face=true')
) >= 0
) {
disableFontFace = true
} else {
disableFontFace = false
}
this.pdfjs = PDFJS.getDocument({
url: this.url,
cMapUrl: window.pdfCMapsPath,
cMapPacked: true,
disableFontFace,
// Enable fetching with Range headers to restrict individual
// requests to 128kb.
// To do this correctly we must:
// a) disable auto-fetching of the whole file upfront
// b) disable streaming (which in this context means streaming of
// the response into memory). This isn't supported when using
// Range headers, but shouldn't be a problem since we are already
// limiting individual response size through chunked range
// requests
rangeChunkSize: 128 * 1024,
disableAutoFetch: !!this.options.disableAutoFetch,
disableStream: !!this.options.disableAutoFetch,
})
this.pdfjs.onProgress = this.options.progressCallback
this.document = this.pdfjs
this.navigateFn = this.options.navigateFn
this.spinner = new pdfSpinner()
this.resetState()
this.document.promise.then(pdfDocument => {
return pdfDocument.getDownloadInfo().then(() => {
return this.options.loadedCallback()
})
})
this.errorCallback = this.options.errorCallback
this.pageSizeChangeCallback = this.options.pageSizeChangeCallback
this.pdfjs.promise.catch(exception => {
// error getting document
return this.errorCallback(exception)
})
}
resetState() {
this.renderQueue = []
if (this.queueTimer != null) {
clearTimeout(this.queueTimer)
}
// clear any existing timers, render tasks
for (const timer of Array.from(this.spinTimer || [])) {
clearTimeout(timer)
}
for (const page of Array.from(this.pageState || [])) {
__guard__(page != null ? page.loadTask : undefined, x => x.cancel())
__guard__(page != null ? page.renderTask : undefined, x1 =>
x1.cancel()
)
}
// initialise/reset the state
this.pageState = []
this.spinTimer = [] // timers for starting the spinners (to avoid jitter)
this.spinTimerDone = [] // array of pages where the spinner has activated
return (this.jobs = 0)
}
getNumPages() {
return this.document.promise.then(pdfDocument => pdfDocument.numPages)
}
getPage(pageNum) {
return this.document.promise.then(pdfDocument =>
pdfDocument.getPage(pageNum)
)
}
getPdfViewport(pageNum, scale) {
if (scale == null) {
;({ scale } = this)
}
return this.document.promise.then(pdfDocument => {
return pdfDocument.getPage(pageNum).then(
function (page) {
let viewport
return (viewport = page.getViewport({ scale: scale }))
},
error => {
return typeof this.errorCallback === 'function'
? this.errorCallback(error)
: undefined
}
)
})
}
getDestinations() {
return this.document.promise.then(pdfDocument =>
pdfDocument.getDestinations()
)
}
getDestination(dest) {
return this.document.promise.then(
pdfDocument => pdfDocument.getDestination(dest),
error => {
return typeof this.errorCallback === 'function'
? this.errorCallback(error)
: undefined
}
)
}
getPageIndex(ref) {
return this.document.promise.then(pdfDocument => {
return pdfDocument.getPageIndex(ref).then(
idx => idx,
error => {
return typeof this.errorCallback === 'function'
? this.errorCallback(error)
: undefined
}
)
})
}
getScale() {
return this.scale
}
setScale(scale) {
this.scale = scale
return this.resetState()
}
triggerRenderQueue(interval) {
if (interval == null) {
interval = this.JOB_QUEUE_INTERVAL
}
if (this.queueTimer != null) {
clearTimeout(this.queueTimer)
}
return (this.queueTimer = setTimeout(() => {
this.queueTimer = null
return this.processRenderQueue()
}, interval))
}
removeCompletedJob(pagenum) {
this.jobs = this.jobs - 1
return this.triggerRenderQueue(0)
}
renderPages(pages) {
if (this.shuttingDown) {
return
}
this.renderQueue = Array.from(pages).map(page => ({
element: page.elementChildren,
pagenum: page.pageNum,
}))
return this.triggerRenderQueue()
}
renderPage(page) {
if (this.shuttingDown) {
return
}
const current = {
element: page.elementChildren,
pagenum: page.pageNum,
}
this.renderQueue.push(current)
return this.processRenderQueue()
}
getPageDetails(page) {
return [page.element.canvas, page.pagenum]
}
// handle the loading indicators for each page
startIndicators() {
// make an array of the pages in the queue
this.queuedPages = []
for (var page of Array.from(this.renderQueue)) {
this.queuedPages[page.pagenum] = true
}
// clear any unfinished spinner timers on pages that aren't in the queue any more
for (const pagenum in this.spinTimer) {
if (!this.queuedPages[pagenum]) {
clearTimeout(this.spinTimer[pagenum])
delete this.spinTimer[pagenum]
}
}
// add indicators for any new pages in the current queue
return (() => {
const result = []
for (page of Array.from(this.renderQueue)) {
if (
!this.spinTimer[page.pagenum] &&
!this.spinTimerDone[page.pagenum]
) {
result.push(this.startIndicator(page))
}
}
return result
})()
}
startIndicator(page) {
const [canvas, pagenum] = Array.from(this.getPageDetails(page))
canvas.addClass('pdfng-loading')
return (this.spinTimer[pagenum] = setTimeout(() => {
for (const queuedPage of Array.from(this.renderQueue)) {
if (pagenum === queuedPage.pagenum) {
this.spinner.add(canvas, { static: true })
this.spinTimerDone[pagenum] = true
break
}
}
return delete this.spinTimer[pagenum]
}, this.INDICATOR_DELAY1))
}
updateIndicator(page) {
const [canvas, pagenum] = Array.from(this.getPageDetails(page))
// did the spinner insert itself already?
if (this.spinTimerDone[pagenum]) {
return (this.spinTimer[pagenum] = setTimeout(() => {
this.spinner.start(canvas)
return delete this.spinTimer[pagenum]
}, this.INDICATOR_DELAY2))
} else {
// stop the existing spin timer
clearTimeout(this.spinTimer[pagenum])
// start a new one which will also start spinning
return (this.spinTimer[pagenum] = setTimeout(() => {
this.spinner.add(canvas, { static: true })
this.spinTimerDone[pagenum] = true
return (this.spinTimer[pagenum] = setTimeout(() => {
this.spinner.start(canvas)
return delete this.spinTimer[pagenum]
}, this.INDICATOR_DELAY2))
}, this.INDICATOR_DELAY1))
}
}
clearIndicator(page) {
const [canvas, pagenum] = Array.from(this.getPageDetails(page))
this.spinner.stop(canvas)
clearTimeout(this.spinTimer[pagenum])
delete this.spinTimer[pagenum]
return (this.spinTimerDone[pagenum] = true)
}
// handle the queue of pages to be rendered
processRenderQueue() {
let pageState
if (this.shuttingDown) {
return
}
// mark all pages in the queue as loading
this.startIndicators()
// bail out if there is already a render job running
if (this.jobs > 0) {
return
}
// take the first page in the queue
let page = this.renderQueue.shift()
// check if it is in action already
while (page != null && this.pageState[page.pagenum] != null) {
page = this.renderQueue.shift()
}
if (page == null) {
return
}
const [element, pagenum] = Array.from([page.element, page.pagenum])
this.jobs = this.jobs + 1
// update the spinner to make it spinning (signifies loading has begun)
this.updateIndicator(page)
let timedOut = false
const timer = $timeout(() => {
// page load timed out
if (loadTask.cancelled) {
return
} // return from cancelled page load
captureMessage(
`pdfng page load timed out after ${this.PAGE_LOAD_TIMEOUT}ms`
)
timedOut = true
this.clearIndicator(page)
// @jobs = @jobs - 1
// @triggerRenderQueue(0)
return typeof this.errorCallback === 'function'
? this.errorCallback('timeout')
: undefined
}, this.PAGE_LOAD_TIMEOUT)
var loadTask = this.getPage(pagenum)
loadTask.cancel = function () {
return (this.cancelled = true)
}
this.pageState[pagenum] = pageState = { loadTask }
return loadTask
.then(pageObject => {
// page load success
$timeout.cancel(timer)
if (loadTask.cancelled) {
return
} // return from cancelled page load
pageState.renderTask = this.doRender(element, pagenum, pageObject)
return pageState.renderTask.promise.then(
() => {
// render task success
this.clearIndicator(page)
pageState.complete = true
delete pageState.renderTask
return this.removeCompletedJob(pagenum)
},
() => {
// render task failed
// could display an error icon
pageState.complete = false
delete pageState.renderTask
return this.removeCompletedJob(pagenum)
}
)
})
.catch(error => {
// page load error
$timeout.cancel(timer)
return this.clearIndicator(page)
})
}
doRender(element, pagenum, page) {
const self = this
const { scale } = this
if (scale == null) {
// scale is undefined, returning
return
}
const canvas = $(
'<canvas class="pdf-canvas pdfng-rendering"></canvas>'
)
// In Windows+IE we must have the canvas in the DOM during
// rendering to see the fonts defined in the DOM. If we try to
// render 'offscreen' then all the text will be sans-serif.
// Previously we rendered offscreen and added in the canvas
// when rendering was complete.
element.canvas.replaceWith(canvas)
const viewport = page.getViewport({ scale: scale })
const devicePixelRatio = window.devicePixelRatio || 1
const ctx = canvas[0].getContext('2d')
const backingStoreRatio =
ctx.webkitBackingStorePixelRatio ||
ctx.mozBackingStorePixelRatio ||
ctx.msBackingStorePixelRatio ||
ctx.oBackingStorePixelRatio ||
ctx.backingStorePixelRatio ||
1
const pixelRatio = devicePixelRatio / backingStoreRatio
const scaledWidth = (Math.floor(viewport.width) * pixelRatio) | 0
const scaledHeight = (Math.floor(viewport.height) * pixelRatio) | 0
const newWidth = Math.floor(viewport.width)
const newHeight = Math.floor(viewport.height)
canvas[0].height = scaledHeight
canvas[0].width = scaledWidth
canvas.height(newHeight + 'px')
canvas.width(newWidth + 'px')
const oldHeight = element.canvas.height()
const oldWidth = element.canvas.width()
if (newHeight !== oldHeight || newWidth !== oldWidth) {
element.canvas.height(newHeight + 'px')
element.canvas.width(newWidth + 'px')
element.container.height(newHeight + 'px')
element.container.width(newWidth + 'px')
if (typeof this.pageSizeChangeCallback === 'function') {
this.pageSizeChangeCallback(pagenum, newHeight - oldHeight)
}
}
const textLayer = new pdfTextLayer({
textLayerDiv: element.text[0],
viewport,
renderer: PDFJS.renderTextLayer,
})
const annotationsLayer = new pdfAnnotations({
annotations: element.annotations[0],
viewport,
navigateFn: this.navigateFn,
})
const result = page.render({
canvasContext: ctx,
viewport,
transform: [pixelRatio, 0, 0, pixelRatio, 0, 0],
})
const textLayerTimeout = this.TEXTLAYER_TIMEOUT
result.promise
.then(function () {
// page render success
canvas.removeClass('pdfng-rendering')
page.getTextContent({ normalizeWhitespace: true }).then(
function (textContent) {
textLayer.setTextContent(textContent)
return textLayer.render(textLayerTimeout)
},
error =>
typeof self.errorCallback === 'function'
? self.errorCallback(error)
: undefined
)
return page.getAnnotations().then(
annotations => annotationsLayer.setAnnotations(annotations),
error =>
typeof self.errorCallback === 'function'
? self.errorCallback(error)
: undefined
)
})
.catch(function (error) {
// page render failed
if (error.name === 'RenderingCancelledException') {
// do nothing when cancelled
} else {
return typeof self.errorCallback === 'function'
? self.errorCallback(error)
: undefined
}
})
return result
}
destroy() {
this.shuttingDown = true
this.resetState()
return this.pdfjs.promise.then(function (document) {
document.cleanup()
return document.destroy()
})
}
}
PDFRenderer.initClass()
return PDFRenderer
})())
}
)
function __guard__(value, transform) {
return typeof value !== 'undefined' && value !== null
? transform(value)
: undefined
}
function __guardMethod__(obj, methodName, transform) {
if (
typeof obj !== 'undefined' &&
obj !== null &&
typeof obj[methodName] === 'function'
) {
return transform(obj, methodName)
} else {
return undefined
}
}