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 @@
				@@ -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 = {
				@@ -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 @@
				@@ -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;
+})();