Very basic worker implementation

14 years ago · 0a571899c8
3 changed files with 69 additions and 1 deletions
--- a/web/viewer.html
+++ b/web/viewer.html
@ -11,6 +11,7 @@
        <script type="text/javascript" src="../crypto.js"></script>
        <script type="text/javascript" src="../glyphlist.js"></script>
        <script type="text/javascript" src="../metrics.js"></script>
        <script type="text/javascript" src="../worker.js"></script>
  </head>
  <body>
--- a/web/viewer.js
+++ b/web/viewer.js
@ -152,7 +152,7 @@ var PDFView = {
    while (container.hasChildNodes())
      container.removeChild(container.lastChild);
-    var pdf = new PDFDoc(new Stream(data));
+    var pdf = new WorkerPDFDoc(data);
    var pagesCount = pdf.numPages;
    document.getElementById('numPages').innerHTML = pagesCount;
--- a/worker.js
+++ b/worker.js
@ -0,0 +1,67 @@
 /* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
 'use strict';
 var WorkerPage = (function() {
  function constructor(workerPDF, page) {
    this.workerPDF = workerPDF;
    this.page = page;
    this.ref = page.ref;
  }
  constructor.prototype = {
    get width() {
      return this.page.width;
    },
    get height() {
      return this.page.height;
    },
    get stats() {
      return this.page.stats;
    },
    startRendering: function(ctx, callback, errback)  {
      // TODO: Place the worker magic HERE.
      this.page.startRendering(ctx, callback, errback);
    },
    getLinks: function() {
      return this.page.getLinks();
    }
  };
  return constructor;
 })();
 var WorkerPDFDoc = (function() {
  function constructor(data) {
    this.data = data;
    this.stream = new Stream(data);
    this.pdf = new PDFDoc(this.stream);
    this.catalog = this.pdf.catalog;
    this.pageCache = [];
  }
  constructor.prototype = {
    get numPages() {
      return this.pdf.numPages;
    },
    getPage: function(n) {
      if (this.pageCache[n]) {
        return this.pageCache[n];
      }
      var page = this.pdf.getPage(n);
      return this.pageCache[n] = new WorkerPage(this, page);
    }
  };
  return constructor;
 })();