Merge branch 'refs/heads/master' into issue-1049

Conflicts:
	src/canvas.js

Makefile

@@ -3,6 +3,7 @@ BUILD_DIR := build
 BUILD_TARGET := $(BUILD_DIR)/pdf.js
 DEFAULT_BROWSERS := resources/browser_manifests/browser_manifest.json
 DEFAULT_TESTS := test_manifest.json
+DEFAULT_PYTHON := python2.7
 
 EXTENSION_SRC := ./extensions/
 EXTENSION_BASE_VERSION := 4bb289ec499013de66eb421737a4dbb4a9273eda
@@ -36,6 +37,7 @@ PDF_JS_FILES = \
   stream.js \
   worker.js \
   ../external/jpgjs/jpg.js \
+  jpx.js \
 	$(NULL)
 
 # make server
@@ -43,7 +45,7 @@ PDF_JS_FILES = \
 # This target starts a local web server at localhost:8888. This can be
 # used for testing all browsers.
 server:
-	@cd test; python test.py --port=8888;
+	@cd test; $(DEFAULT_PYTHON) test.py --port=8888;
 
 # make test
 #
@@ -106,7 +108,7 @@ browser-test:
 	fi;
 
 	cd test; \
-	python test.py --reftest \
+	$(DEFAULT_PYTHON) test.py --reftest \
 	--browserManifestFile=$(PDF_BROWSERS) \
 	--manifestFile=$(PDF_TESTS)
 

examples/acroforms/index.html

@@ -23,6 +23,7 @@
   <script type="text/javascript" src="../../src/stream.js"></script>
   <script type="text/javascript" src="../../src/worker.js"></script>
   <script type="text/javascript" src="../../external/jpgjs/jpg.js"></script>
+  <script type="text/javascript" src="../../src/jpx.js"></script>
 
   <script type="text/javascript">
     // Specify the main script used to create a new PDF.JS web worker.

examples/helloworld/index.html

@@ -23,6 +23,7 @@
   <script type="text/javascript" src="../../src/stream.js"></script>
   <script type="text/javascript" src="../../src/worker.js"></script>
   <script type="text/javascript" src="../../external/jpgjs/jpg.js"></script>
+  <script type="text/javascript" src="../../src/jpx.js"></script>
 
   <script type="text/javascript">
     // Specify the main script used to create a new PDF.JS web worker.

src/canvas.js

@@ -550,7 +550,7 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
       var current = this.current;
 
       if (!fontObj)
-        throw 'Can\'t find font for ' + fontRefName;
+        error('Can\'t find font for ' + fontRefName);
 
       // Slice-clone matrix so we can manipulate it without affecting original
       if (fontObj.fontMatrix)
@@ -889,7 +889,7 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
       } else if (IR[0] == 'RadialAxial' || IR[0] == 'Dummy') {
         var pattern = Pattern.shadingFromIR(this.ctx, IR);
       } else {
-        throw 'Unkown IR type';
+        error('Unkown IR type ' + IR[0]);
       }
       return pattern;
     },

src/colorspace.js

@@ -369,55 +369,16 @@ var DeviceCmykCS = (function DeviceCmykCSClosure() {
   DeviceCmykCS.prototype = {
     getRgb: function cmykcs_getRgb(color) {
       var c = color[0], m = color[1], y = color[2], k = color[3];
-      var c1 = 1 - c, m1 = 1 - m, y1 = 1 - y, k1 = 1 - k;
 
-      var x, r, g, b;
+      // CMYK -> CMY: http://www.easyrgb.com/index.php?X=MATH&H=14#text14
-      // this is a matrix multiplication, unrolled for performance
+      c = (c * (1 - k) + k);
-      // code is taken from the poppler implementation
+      m = (m * (1 - k) + k);
-      x = c1 * m1 * y1 * k1; // 0 0 0 0
+      y = (y * (1 - k) + k);
-      r = g = b = x;
+
-      x = c1 * m1 * y1 * k;  // 0 0 0 1
+      // CMY -> RGB: http://www.easyrgb.com/index.php?X=MATH&H=12#text12
-      r += 0.1373 * x;
+      var r = (1 - c);
-      g += 0.1216 * x;
+      var g = (1 - m);
-      b += 0.1255 * x;
+      var b = (1 - y);
-      x = c1 * m1 * y * k1;  // 0 0 1 0
-      r += x;
-      g += 0.9490 * x;
-      x = c1 * m1 * y * k;   // 0 0 1 1
-      r += 0.1098 * x;
-      g += 0.1020 * x;
-      x = c1 * m * y1 * k1;  // 0 1 0 0
-      r += 0.9255 * x;
-      b += 0.5490 * x;
-      x = c1 * m * y1 * k;   // 0 1 0 1
-      r += 0.1412 * x;
-      x = c1 * m * y * k1;   // 0 1 1 0
-      r += 0.9294 * x;
-      g += 0.1098 * x;
-      b += 0.1412 * x;
-      x = c1 * m * y * k;    // 0 1 1 1
-      r += 0.1333 * x;
-      x = c * m1 * y1 * k1;  // 1 0 0 0
-      g += 0.6784 * x;
-      b += 0.9373 * x;
-      x = c * m1 * y1 * k;   // 1 0 0 1
-      g += 0.0588 * x;
-      b += 0.1412 * x;
-      x = c * m1 * y * k1;   // 1 0 1 0
-      g += 0.6510 * x;
-      b += 0.3137 * x;
-      x = c * m1 * y * k;    // 1 0 1 1
-      g += 0.0745 * x;
-      x = c * m * y1 * k1;   // 1 1 0 0
-      r += 0.1804 * x;
-      g += 0.1922 * x;
-      b += 0.5725 * x;
-      x = c * m * y1 * k;    // 1 1 0 1
-      b += 0.0078 * x;
-      x = c * m * y * k1;    // 1 1 1 0
-      r += 0.2118 * x;
-      g += 0.2119 * x;
-      b += 0.2235 * x;
 
       return [r, g, b];
     },

src/core.js

@@ -410,14 +410,14 @@ var Page = (function PageClosure() {
             if (callback)
               callback(e);
             else
-              throw e;
+              error(e);
           }
         }.bind(this),
         function pageDisplayReadPromiseError(reason) {
           if (callback)
             callback(reason);
           else
-            throw reason;
+            error(reason);
         }
       );
     }
@@ -620,7 +620,7 @@ var PDFDoc = (function PDFDocClosure() {
     if (!globalScope.PDFJS.disableWorker && typeof Worker !== 'undefined') {
       var workerSrc = PDFJS.workerSrc;
       if (typeof workerSrc === 'undefined') {
-        throw 'No PDFJS.workerSrc specified';
+        error('No PDFJS.workerSrc specified');
       }
 
       try {
@@ -716,7 +716,7 @@ var PDFDoc = (function PDFDocClosure() {
             });
             break;
           default:
-            throw 'Got unkown object type ' + type;
+            error('Got unkown object type ' + type);
         }
       }, this);
 
@@ -737,7 +737,7 @@ var PDFDoc = (function PDFDocClosure() {
         if (page.displayReadyPromise)
           page.displayReadyPromise.reject(data.error);
         else
-          throw data.error;
+          error(data.error);
       }, this);
 
       messageHandler.on('jpeg_decode', function(data, promise) {

src/fonts.js

@@ -2235,9 +2235,8 @@ var Font = (function FontClosure() {
           }
 
           // MacRoman encoding address by re-encoding the cmap table
-          unicode = glyphName in GlyphsUnicode ?
+          unicode = glyphName in this.glyphNameMap ?
-            GlyphsUnicode[glyphName] :
+            this.glyphNameMap[glyphName] : GlyphsUnicode[glyphName];
-            this.glyphNameMap[glyphName];
           break;
         default:
           warn('Unsupported font type: ' + this.type);

src/obj.js

@@ -574,7 +574,7 @@ var XRef = (function XRefClosure() {
       var stream, parser;
       if (e.uncompressed) {
         if (e.gen != gen)
-          throw ('inconsistent generation in XRef');
+          error('inconsistent generation in XRef');
         stream = this.stream.makeSubStream(e.offset);
         parser = new Parser(new Lexer(stream), true, this);
         var obj1 = parser.getObj();
@@ -703,7 +703,7 @@ var PDFObjects = (function PDFObjectsClosure() {
       // If there isn't an object yet or the object isn't resolved, then the
       // data isn't ready yet!
       if (!obj || !obj.isResolved) {
-        throw 'Requesting object that isn\'t resolved yet ' + objId;
+        error('Requesting object that isn\'t resolved yet ' + objId);
         return null;
       } else {
         return obj.data;

src/parser.js

@@ -240,6 +240,10 @@ var Parser = (function ParserClosure() {
         var bytes = stream.getBytes(length);
         return new JpegStream(bytes, stream.dict, this.xref);
       }
+      if (name == 'JPXDecode' || name == 'JPX') {
+        var bytes = stream.getBytes(length);
+        return new JpxStream(bytes, stream.dict);
+      }
       if (name == 'ASCII85Decode' || name == 'A85') {
         return new Ascii85Stream(stream);
       }

src/stream.js

@@ -821,21 +821,25 @@ var JpegStream = (function JpegStreamClosure() {
   JpegStream.prototype.ensureBuffer = function jpegStreamEnsureBuffer(req) {
     if (this.bufferLength)
       return;
-    var jpegImage = new JpegImage();
+    try {
-    if (this.colorTransform != -1)
+      var jpegImage = new JpegImage();
-      jpegImage.colorTransform = this.colorTransform;
+      if (this.colorTransform != -1)
-    jpegImage.parse(this.bytes);
+        jpegImage.colorTransform = this.colorTransform;
-    var width = jpegImage.width;
+      jpegImage.parse(this.bytes);
-    var height = jpegImage.height;
+      var width = jpegImage.width;
-    var data = jpegImage.getData(width, height);
+      var height = jpegImage.height;
-    this.buffer = data;
+      var data = jpegImage.getData(width, height);
-    this.bufferLength = data.length;
+      this.buffer = data;
+      this.bufferLength = data.length;
+    } catch (e) {
+      error('JPEG error: ' + e);
+    }
   };
   JpegStream.prototype.getIR = function jpegStreamGetIR() {
     return bytesToString(this.bytes);
   };
   JpegStream.prototype.getChar = function jpegStreamGetChar() {
-      error('internal error: getChar is not valid on JpegStream');
+    error('internal error: getChar is not valid on JpegStream');
   };
   /**
    * Checks if the image can be decoded and displayed by the browser without any
@@ -869,6 +873,107 @@ var JpegStream = (function JpegStreamClosure() {
   return JpegStream;
 })();
 
+/**
+ * For JPEG 2000's we use a library to decode these images and
+ * the stream behaves like all the other DecodeStreams.
+ */
+var JpxStream = (function JpxStreamClosure() {
+  function JpxStream(bytes, dict) {
+    this.dict = dict;
+    this.bytes = bytes;
+
+    DecodeStream.call(this);
+  }
+
+  JpxStream.prototype = Object.create(DecodeStream.prototype);
+
+  JpxStream.prototype.ensureBuffer = function jpxStreamEnsureBuffer(req) {
+    if (this.bufferLength)
+      return;
+
+    var jpxImage = new JpxImage();
+    jpxImage.parse(this.bytes);
+
+    var width = jpxImage.width;
+    var height = jpxImage.height;
+    var componentsCount = jpxImage.componentsCount;
+    if (componentsCount != 1 && componentsCount != 3 && componentsCount != 4)
+      error('JPX with ' + componentsCount + ' components is not supported');
+
+    var data = new Uint8Array(width * height * componentsCount);
+
+    for (var k = 0, kk = jpxImage.tiles.length; k < kk; k++) {
+      var tileCompoments = jpxImage.tiles[k];
+      var tileWidth = tileCompoments[0].width;
+      var tileHeight = tileCompoments[0].height;
+      var tileLeft = tileCompoments[0].left;
+      var tileTop = tileCompoments[0].top;
+
+      var dataPosition, sourcePosition, data0, data1, data2, data3, rowFeed;
+      switch (componentsCount) {
+        case 1:
+          data0 = tileCompoments[0].items;
+
+          dataPosition = width * tileTop + tileLeft;
+          rowFeed = width - tileWidth;
+          sourcePosition = 0;
+          for (var j = 0; j < tileHeight; j++) {
+            for (var i = 0; i < tileWidth; i++)
+              data[dataPosition++] = data0[sourcePosition++];
+            dataPosition += rowFeed;
+          }
+          break;
+        case 3:
+          data0 = tileCompoments[0].items;
+          data1 = tileCompoments[1].items;
+          data2 = tileCompoments[2].items;
+
+          dataPosition = (width * tileTop + tileLeft) * 3;
+          rowFeed = (width - tileWidth) * 3;
+          sourcePosition = 0;
+          for (var j = 0; j < tileHeight; j++) {
+            for (var i = 0; i < tileWidth; i++) {
+              data[dataPosition++] = data0[sourcePosition];
+              data[dataPosition++] = data1[sourcePosition];
+              data[dataPosition++] = data2[sourcePosition];
+              sourcePosition++;
+            }
+            dataPosition += rowFeed;
+          }
+          break;
+        case 4:
+          data0 = tileCompoments[0].items;
+          data1 = tileCompoments[1].items;
+          data2 = tileCompoments[2].items;
+          data3 = tileCompoments[3].items;
+
+          dataPosition = (width * tileTop + tileLeft) * 4;
+          rowFeed = (width - tileWidth) * 4;
+          sourcePosition = 0;
+          for (var j = 0; j < tileHeight; j++) {
+            for (var i = 0; i < tileWidth; i++) {
+              data[dataPosition++] = data0[sourcePosition];
+              data[dataPosition++] = data1[sourcePosition];
+              data[dataPosition++] = data2[sourcePosition];
+              data[dataPosition++] = data3[sourcePosition];
+              sourcePosition++;
+            }
+            dataPosition += rowFeed;
+          }
+          break;
+      }
+    }
+
+    this.buffer = data;
+    this.bufferLength = data.length;
+  };
+  JpxStream.prototype.getChar = function jpxStreamGetChar() {
+    error('internal error: getChar is not valid on JpxStream');
+  };
+
+  return JpxStream;
+})();
+
 var DecryptStream = (function DecryptStreamClosure() {
   function DecryptStream(str, decrypt) {
     this.str = str;

src/util.js

@@ -259,8 +259,8 @@ var Promise = (function PromiseClosure() {
         return;
       }
       if (this._data !== EMPTY_PROMISE) {
-        throw 'Promise ' + this.name +
+        error('Promise ' + this.name +
-                                ': Cannot set the data of a promise twice';
+              ': Cannot set the data of a promise twice');
       }
       this._data = value;
       this.hasData = true;
@@ -272,7 +272,7 @@ var Promise = (function PromiseClosure() {
 
     get data() {
       if (this._data === EMPTY_PROMISE) {
-        throw 'Promise ' + this.name + ': Cannot get data that isn\'t set';
+        error('Promise ' + this.name + ': Cannot get data that isn\'t set');
       }
       return this._data;
     },
@@ -287,10 +287,10 @@ var Promise = (function PromiseClosure() {
 
     resolve: function promiseResolve(data) {
       if (this.isResolved) {
-        throw 'A Promise can be resolved only once ' + this.name;
+        error('A Promise can be resolved only once ' + this.name);
       }
       if (this.isRejected) {
-        throw 'The Promise was already rejected ' + this.name;
+        error('The Promise was already rejected ' + this.name);
       }
 
       this.isResolved = true;
@@ -304,10 +304,10 @@ var Promise = (function PromiseClosure() {
 
     reject: function proimseReject(reason) {
       if (this.isRejected) {
-        throw 'A Promise can be rejected only once ' + this.name;
+        error('A Promise can be rejected only once ' + this.name);
       }
       if (this.isResolved) {
-        throw 'The Promise was already resolved ' + this.name;
+        error('The Promise was already resolved ' + this.name);
       }
 
       this.isRejected = true;
@@ -321,7 +321,7 @@ var Promise = (function PromiseClosure() {
 
     then: function promiseThen(callback, errback) {
       if (!callback) {
-        throw 'Requiring callback' + this.name;
+        error('Requiring callback' + this.name);
       }
 
       // If the promise is already resolved, call the callback directly.

src/worker.js

@@ -26,7 +26,7 @@ function MessageHandler(name, comObj) {
         delete callbacks[callbackId];
         callback(data.data);
       } else {
-        throw 'Cannot resolve callback ' + callbackId;
+        error('Cannot resolve callback ' + callbackId);
       }
     } else if (data.action in ah) {
       var action = ah[data.action];
@@ -44,7 +44,7 @@ function MessageHandler(name, comObj) {
         action[0].call(action[1], data.data);
       }
     } else {
-      throw 'Unkown action from worker: ' + data.action;
+      error('Unkown action from worker: ' + data.action);
     }
   };
 }
@@ -53,7 +53,7 @@ MessageHandler.prototype = {
   on: function messageHandlerOn(actionName, handler, scope) {
     var ah = this.actionHandler;
     if (ah[actionName]) {
-      throw 'There is already an actionName called "' + actionName + '"';
+      error('There is already an actionName called "' + actionName + '"');
     }
     ah[actionName] = [handler, scope];
   },
@@ -224,6 +224,7 @@ var workerConsole = {
       action: 'console_error',
       data: args
     });
+    throw 'pdf.js execution error';
   },
 
   time: function time(name) {
@@ -233,7 +234,7 @@ var workerConsole = {
   timeEnd: function timeEnd(name) {
     var time = consoleTimer[name];
     if (time == null) {
-      throw 'Unkown timer name ' + name;
+      error('Unkown timer name ' + name);
     }
     this.log('Timer:', name, Date.now() - time);
   }

src/worker_loader.js

@@ -23,7 +23,8 @@ var files = [
   'pattern.js',
   'stream.js',
   'worker.js',
-  '../external/jpgjs/jpg.js'
+  '../external/jpgjs/jpg.js',
+  'jpx.js'
 ];
 
 // Load all the files.

test/pdfs/.gitignore

@@ -22,4 +22,5 @@
 !issue918.pdf
 !smaskdim.pdf
 !type4psfunc.pdf
+!S2.pdf
 !zerowidthline.pdf

test/pdfs/issue1096.pdf.link

@@ -0,0 +1 @@
+http://www.faithaliveresources.org/Content/Site135/FilesSamples/105315400440pdf_00000009843.pdf

test/test_manifest.json

@@ -402,6 +402,14 @@
       "link": true,
       "type": "eq"
     },
+    {  "id": "issue1096",
+      "file": "pdfs/issue1096.pdf",
+      "md5": "7f75d2b4b93c78d401ff39e8c1b00612",
+      "rounds": 1,
+      "pageLimit": 10,
+      "link": true,
+      "type": "eq"
+    },
     {  "id": "liveprogramming",
       "file": "pdfs/liveprogramming.pdf",
       "md5": "7bd4dad1188232ef597d36fd72c33e52",
@@ -410,6 +418,12 @@
       "link": true,
       "type": "load"
     },
+    {  "id": "S2-eq",
+       "file": "pdfs/S2.pdf",
+       "md5": "d0b6137846df6e0fe058f234a87fb588",
+       "rounds": 1,
+       "type": "eq"
+    },
     {  "id": "issue1055",
       "file": "pdfs/issue1055.pdf",
       "md5": "3ba56c2e48dce81da8669b1b9cf98ff0",

test/test_slave.html

@@ -22,6 +22,7 @@
     <script type="text/javascript" src="/src/stream.js"></script>
     <script type="text/javascript" src="/src/worker.js"></script>
     <script type="text/javascript" src="/external/jpgjs/jpg.js"></script>
+    <script type="text/javascript" src="/src/jpx.js"></script>
     <script type="text/javascript" src="driver.js"></script>
 
     <script type="text/javascript">

web/compatibility.js

@@ -224,3 +224,10 @@
     }
   });
 })();
+
+// Check console compatability
+(function checkConsoleCompatibility() {
+  if (typeof console == 'undefined') {
+    console = {log: function() {}};
+  }
+})();

web/viewer.html

@@ -26,6 +26,7 @@
         <script type="text/javascript" src="../src/stream.js"></script>  <!-- PDFJSSCRIPT_REMOVE -->
         <script type="text/javascript" src="../src/worker.js"></script>  <!-- PDFJSSCRIPT_REMOVE -->
         <script type="text/javascript" src="../external/jpgjs/jpg.js"></script>  <!-- PDFJSSCRIPT_REMOVE -->
+        <script type="text/javascript" src="../src/jpx.js"></script>  <!-- PDFJSSCRIPT_REMOVE -->
         <script type="text/javascript">PDFJS.workerSrc = '../src/worker_loader.js';</script> <!-- PDFJSSCRIPT_REMOVE -->
         <script type="text/javascript" src="viewer.js"></script>
 

web/viewer.js

@@ -6,6 +6,7 @@
 var kDefaultURL = 'compressed.tracemonkey-pldi-09.pdf';
 var kDefaultScale = 'auto';
 var kDefaultScaleDelta = 1.1;
+var kUnknownScale = 0;
 var kCacheSize = 20;
 var kCssUnits = 96.0 / 72.0;
 var kScrollbarPadding = 40;
@@ -148,7 +149,7 @@ var currentPageNumber = 1;
 var PDFView = {
   pages: [],
   thumbnails: [],
-  currentScale: 0,
+  currentScale: kUnknownScale,
   currentScaleValue: null,
   initialBookmark: document.location.hash.substring(1),
 
@@ -203,12 +204,12 @@ var PDFView = {
 
   zoomIn: function pdfViewZoomIn() {
     var newScale = Math.min(kMaxScale, this.currentScale * kDefaultScaleDelta);
-    this.setScale(newScale, true);
+    this.parseScale(newScale, true);
   },
 
   zoomOut: function pdfViewZoomOut() {
     var newScale = Math.max(kMinScale, this.currentScale / kDefaultScaleDelta);
-    this.setScale(newScale, true);
+    this.parseScale(newScale, true);
   },
 
   set page(val) {
@@ -458,10 +459,16 @@ var PDFView = {
     }
     else if (storedHash)
       this.setHash(storedHash);
-    else {
+    else if (scale) {
-      this.parseScale(scale || kDefaultScale, true);
+      this.parseScale(scale, true);
       this.page = 1;
     }
+
+    if (PDFView.currentScale === kUnknownScale) {
+      // Scale was not initialized: invalid bookmark or scale was not specified.
+      // Setting the default one.
+      this.parseScale(kDefaultScale, true);
+    }
   },
 
   setHash: function pdfViewSetHash(hash) {
@@ -748,6 +755,8 @@ var PageView = function pageView(container, content, id, pageWidth, pageHeight,
 
       if (scale && scale !== PDFView.currentScale)
         PDFView.parseScale(scale, true);
+      else if (PDFView.currentScale === kUnknownScale)
+        PDFView.parseScale(kDefaultScale, true);
 
       setTimeout(function pageViewScrollIntoViewRelayout() {
         // letting page to re-layout before scrolling
@@ -966,22 +975,55 @@ var TextLayerBuilder = function textLayerBuilder(textLayerDiv) {
     var self = this;
     var textDivs = this.textDivs;
     var textLayerDiv = this.textLayerDiv;
-    this.textLayerTimer = setInterval(function renderTextLayer() {
+    var renderTimer = null;
+    var renderingDone = false;
+    var renderInterval = 0;
+    var resumeInterval = 500; // in ms
+
+    // Render the text layer, one div at a time
+    function renderTextLayer() {
       if (textDivs.length === 0) {
-        clearInterval(self.textLayerTimer);
+        clearInterval(renderTimer);
+        renderingDone = true;
         return;
       }
       var textDiv = textDivs.shift();
-      if (textDiv.dataset.textLength >= 1) { // avoid div by zero
+      if (textDiv.dataset.textLength > 0) {
         textLayerDiv.appendChild(textDiv);
-        // Adjust div width (via letterSpacing) to match canvas text
+
-        // Due to the .offsetWidth calls, this is slow
+        if (textDiv.dataset.textLength > 1) { // avoid div by zero
-        textDiv.style.letterSpacing =
+          // Adjust div width (via letterSpacing) to match canvas text
-          ((textDiv.dataset.canvasWidth - textDiv.offsetWidth) /
+          // Due to the .offsetWidth calls, this is slow
-            (textDiv.dataset.textLength - 1)) + 'px';
+          // This needs to come after appending to the DOM
+          textDiv.style.letterSpacing =
+            ((textDiv.dataset.canvasWidth - textDiv.offsetWidth) /
+              (textDiv.dataset.textLength - 1)) + 'px';
+        }
+      } // textLength > 0
+    }
+    renderTimer = setInterval(renderTextLayer, renderInterval);
+
+    // Stop rendering when user scrolls. Resume after XXX milliseconds
+    // of no scroll events
+    var scrollTimer = null;
+    function textLayerOnScroll() {
+      if (renderingDone) {
+        window.removeEventListener('scroll', textLayerOnScroll, false);
+        return;
       }
-    }, 0);
+
-  };
+      // Immediately pause rendering
+      clearInterval(renderTimer);
+
+      clearTimeout(scrollTimer);
+      scrollTimer = setTimeout(function textLayerScrollTimer() {
+        // Resume rendering
+        renderTimer = setInterval(renderTextLayer, renderInterval);
+      }, resumeInterval);
+    }; // textLayerOnScroll
+
+    window.addEventListener('scroll', textLayerOnScroll, false);
+  }; // endLayout
 
   this.appendText = function textLayerBuilderAppendText(text,
                                                         fontName, fontSize) {
@@ -1240,7 +1282,7 @@ window.addEventListener('keydown', function keydown(evt) {
       handled = true;
       break;
     case 48: // '0'
-      PDFView.setScale(kDefaultScale, true);
+      PDFView.parseScale(kDefaultScale, true);
       handled = true;
       break;
     case 37: // left arrow