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278 lines
8 KiB
CoffeeScript
278 lines
8 KiB
CoffeeScript
define [
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"base"
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], (App) ->
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# App = angular.module 'PDFRenderer', ['pdfAnnotations', 'pdfTextLayer']
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App.factory 'PDFRenderer', ['$q', '$timeout', 'pdfAnnotations', 'pdfTextLayer', 'pdfSpinner', ($q, $timeout, pdfAnnotations, pdfTextLayer, pdfSpinner) ->
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class PDFRenderer
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JOB_QUEUE_INTERVAL: 25
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PAGE_LOAD_TIMEOUT: 60*1000
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PAGE_RENDER_TIMEOUT: 60*1000
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constructor: (@url, @options) ->
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# PDFJS.disableFontFace = true # avoids repaints, uses worker more
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# PDFJS.disableAutoFetch = true # enable this to prevent loading whole file
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# PDFJS.disableStream
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# PDFJS.disableRange
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@scale = @options.scale || 1
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@pdfjs = PDFJS.getDocument @url, null, null, @options.progressCallback
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@document = $q.when(@pdfjs)
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@navigateFn = @options.navigateFn
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@spinner = new pdfSpinner
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@resetState()
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@document.then (pdfDocument) =>
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pdfDocument.getDownloadInfo().then () =>
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@options.loadedCallback()
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@errorCallback = @options.errorCallback
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@pageSizeChangeCallback = @options.pageSizeChangeCallback
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@pdfjs.catch (exception) =>
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# console.log 'ERROR in get document', exception
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@errorCallback(exception)
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resetState: () ->
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@complete = []
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@timeout = []
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@pageLoad = []
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@renderTask = []
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@renderQueue = []
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@jobs = 0
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getNumPages: () ->
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@document.then (pdfDocument) ->
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pdfDocument.numPages
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getPage: (pageNum) ->
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@document.then (pdfDocument) ->
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# console.log 'got pdf document, now getting Page', pageNum
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pdfDocument.getPage(pageNum)
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getPdfViewport: (pageNum, scale) ->
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scale ?= @scale
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@document.then (pdfDocument) =>
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pdfDocument.getPage(pageNum).then (page) ->
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viewport = page.getViewport scale
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, (error) =>
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@errorCallback?(error)
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getDestinations: () ->
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@document.then (pdfDocument) ->
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pdfDocument.getDestinations()
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getDestination: (dest) ->
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@document.then (pdfDocument) ->
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pdfDocument.getDestination(dest)
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, (error) =>
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@errorCallback?(error)
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getPageIndex: (ref) ->
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@document.then (pdfDocument) =>
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pdfDocument.getPageIndex(ref).then (idx) ->
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idx
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, (error) =>
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@errorCallback?(error)
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getScale: () ->
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@scale
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setScale: (@scale) ->
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@resetState()
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triggerRenderQueue: (interval = @JOB_QUEUE_INTERVAL) ->
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@queueTimer = setTimeout () =>
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@queueTimer = null
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@processRenderQueue()
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, interval
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removeCompletedJob: (taskRef, pagenum) ->
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# may need to clean up deferred object here
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delete taskRef[pagenum]
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@jobs = @jobs - 1
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@triggerRenderQueue(0)
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renderPages: (pages) ->
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return if @shuttingDown
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@renderQueue = for page in pages
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{
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'element': page.elementChildren
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'pagenum': page.pageNum
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}
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@triggerRenderQueue()
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renderPage: (page) ->
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return if @shuttingDown
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current = {
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'element': page.elementChildren
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'pagenum': page.pageNum
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}
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@renderQueue.push current
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@processRenderQueue()
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processRenderQueue: () ->
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return if @shuttingDown
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return if @jobs > 0
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current = @renderQueue.shift()
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return unless current?
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[element, pagenum] = [current.element, current.pagenum]
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# if task is underway or complete, go to the next entry in the
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# render queue
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# console.log 'processing renderq', pagenum, @renderTask[pagenum], @complete[pagenum]
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if @pageLoad[pagenum] or @renderTask[pagenum] or @complete[pagenum]
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@processRenderQueue()
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return
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@jobs = @jobs + 1
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element.canvas.addClass('pdfng-loading')
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spinTimer = setTimeout () =>
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@spinner.add(element.canvas)
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, 100
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completeRef = @complete
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renderTaskRef = @renderTask
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# console.log 'started page load', pagenum
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timedOut = false
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timer = $timeout () =>
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Raven?.captureMessage?('pdfng page load timed out after ' + @PAGE_LOAD_TIMEOUT + 'ms (1% sample)') if Math.random() < 0.01
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# console.log 'page load timed out', pagenum
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timedOut = true
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clearTimeout(spinTimer)
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@spinner.stop(element.canvas)
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# @jobs = @jobs - 1
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# @triggerRenderQueue(0)
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@errorCallback?('timeout')
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, @PAGE_LOAD_TIMEOUT
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@pageLoad[pagenum] = @getPage(pagenum)
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@pageLoad[pagenum].then (pageObject) =>
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# console.log 'in page load success', pagenum
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$timeout.cancel(timer)
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clearTimeout(spinTimer)
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@renderTask[pagenum] = @doRender element, pagenum, pageObject
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@renderTask[pagenum].then () =>
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# complete
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# console.log 'render task success', pagenum
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completeRef[pagenum] = true
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@removeCompletedJob renderTaskRef, pagenum
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, () =>
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# console.log 'render task failed', pagenum
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# rejected
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@removeCompletedJob renderTaskRef, pagenum
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.catch (error) ->
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# console.log 'in page load error', pagenum, 'timedOut=', timedOut
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$timeout.cancel(timer)
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clearTimeout(spinTimer)
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# console.log 'ERROR', error
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doRender: (element, pagenum, page) ->
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self = this
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scale = @scale
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if (not scale?)
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# console.log 'scale is undefined, returning'
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return
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canvas = $('<canvas class="pdf-canvas pdfng-rendering"></canvas>')
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viewport = page.getViewport (scale)
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devicePixelRatio = window.devicePixelRatio || 1
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ctx = canvas[0].getContext '2d'
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backingStoreRatio = ctx.webkitBackingStorePixelRatio ||
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ctx.mozBackingStorePixelRatio ||
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ctx.msBackingStorePixelRatio ||
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ctx.oBackingStorePixelRatio ||
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ctx.backingStorePixelRatio || 1
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pixelRatio = devicePixelRatio / backingStoreRatio
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scaledWidth = (Math.floor(viewport.width) * pixelRatio) | 0
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scaledHeight = (Math.floor(viewport.height) * pixelRatio) | 0
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newWidth = Math.floor(viewport.width)
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newHeight = Math.floor(viewport.height)
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canvas[0].height = scaledHeight
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canvas[0].width = scaledWidth
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canvas.height(newHeight + 'px')
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canvas.width(newWidth + 'px')
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oldHeight = element.canvas.height()
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oldWidth = element.canvas.width()
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if newHeight != oldHeight or newWidth != oldWidth
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element.canvas.height(newHeight + 'px')
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element.canvas.width(newWidth + 'px')
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element.container.height(newHeight + 'px')
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element.container.width(newWidth + 'px')
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@pageSizeChangeCallback?(pagenum, newHeight - oldHeight)
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if pixelRatio != 1
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ctx.scale(pixelRatio, pixelRatio)
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textLayer = new pdfTextLayer({
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textLayerDiv: element.text[0]
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viewport: viewport
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})
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annotationsLayer = new pdfAnnotations({
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annotations: element.annotations[0]
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viewport: viewport
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navigateFn: @navigateFn
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})
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element.canvas.replaceWith(canvas)
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# console.log 'staring page render', pagenum
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result = page.render {
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canvasContext: ctx
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viewport: viewport
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}
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timedOut = false
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timer = $timeout () =>
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Raven?.captureMessage?('pdfng page render timed out after ' + @PAGE_RENDER_TIMEOUT + 'ms (1% sample)') if Math.random() < 0.01
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# console.log 'page render timed out', pagenum
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timedOut = true
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result.cancel()
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, @PAGE_RENDER_TIMEOUT
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result.then () ->
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# console.log 'page rendered', pagenum
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$timeout.cancel(timer)
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canvas.removeClass('pdfng-rendering')
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page.getTextContent().then (textContent) ->
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textLayer.setTextContent textContent
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, (error) ->
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self.errorCallback?(error)
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page.getAnnotations().then (annotations) ->
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annotationsLayer.setAnnotations annotations
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, (error) ->
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self.errorCallback?(error)
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.catch (error) ->
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# console.log 'page render failed', pagenum, error
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$timeout.cancel(timer)
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if timedOut
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# console.log 'calling ERROR callback - was timeout'
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self.errorCallback?('timeout')
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else if error != 'cancelled'
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# console.log 'calling ERROR callback'
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self.errorCallback?(error)
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return result
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destroy: () ->
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# console.log 'in pdf renderer destroy', @renderQueue
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@shuttingDown = true
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clearTimeout @queueTimer if @queueTimer?
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@renderQueue = []
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for task in @renderTask
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task.cancel() if task?
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@pdfjs.then (document) ->
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document.cleanup()
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document.destroy()
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]
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