Uses blob URL instead of data when possible

src/core/stream.js

@@ -15,7 +15,7 @@
  * limitations under the License.
  */
 /* globals bytesToString, ColorSpace, Dict, EOF, error, info, Jbig2Image,
-           JpegImage, JpxImage, Lexer, Util */
+           JpegImage, JpxImage, Lexer, Util, PDFJS */
 
 'use strict';
 
@@ -832,7 +832,7 @@ var JpegStream = (function JpegStreamClosure() {
     }
   };
   JpegStream.prototype.getIR = function JpegStream_getIR() {
-    return bytesToString(this.bytes);
+    return PDFJS.createObjectURL(this.bytes, 'image/jpeg');
   };
   /**
    * Checks if the image can be decoded and displayed by the browser without any

src/display/api.js

@@ -815,7 +815,7 @@ var WorkerTransport = (function WorkerTransportClosure() {
       }, this);
 
       messageHandler.on('JpegDecode', function(data, promise) {
-        var imageData = data[0];
+        var imageUrl = data[0];
         var components = data[1];
         if (components != 3 && components != 1)
           error('Only 3 component or 1 component can be returned');
@@ -845,8 +845,7 @@ var WorkerTransport = (function WorkerTransportClosure() {
           }
           promise.resolve({ data: buf, width: width, height: height});
         }).bind(this);
-        var src = 'data:image/jpeg;base64,' + window.btoa(imageData);
+        img.src = imageUrl;
-        img.src = src;
       });
     },
 

src/shared/util.js

@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-/* globals Cmd, ColorSpace, Dict, MozBlobBuilder, Name, PDFJS, Ref */
+/* globals Cmd, ColorSpace, Dict, MozBlobBuilder, Name, PDFJS, Ref, URL */
 
 'use strict';
 
@@ -1100,6 +1100,33 @@ PDFJS.createBlob = function createBlob(data, contentType) {
   return bb.getBlob(contentType);
 };
 
+PDFJS.createObjectURL = (function createObjectURLClosure() {
+  if (typeof URL !== 'undefined' && URL.createObjectURL) {
+    return function createObjectURL(data, contentType) {
+      var blob = PDFJS.createBlob(data, contentType);
+      return URL.createObjectURL(blob);
+    };
+  }
+
+  // Blob/createObjectURL is not available, falling back to data schema.
+  var digits =
+    'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';
+
+  return function createObjectURL(data, contentType) {
+    var buffer = 'data:' + contentType + ';base64,';
+    for (var i = 0, ii = data.length; i < ii; i += 3) {
+      var b1 = data[i] & 0xFF;
+      var b2 = data[i + 1] & 0xFF;
+      var b3 = data[i + 2] & 0xFF;
+      var d1 = b1 >> 2, d2 = ((b1 & 3) << 4) | (b2 >> 4);
+      var d3 = i + 1 < ii ? ((b2 & 0xF) << 2) | (b3 >> 6) : 64;
+      var d4 = i + 2 < ii ? (b3 & 0x3F) : 64;
+      buffer += digits[d1] + digits[d2] + digits[d3] + digits[d4];
+    }
+    return buffer;
+  };
+})();
+
 function MessageHandler(name, comObj) {
   this.name = name;
   this.comObj = comObj;
@@ -1191,10 +1218,10 @@ MessageHandler.prototype = {
   }
 };
 
-function loadJpegStream(id, imageData, objs) {
+function loadJpegStream(id, imageUrl, objs) {
   var img = new Image();
   img.onload = (function loadJpegStream_onloadClosure() {
     objs.resolve(id, img);
   });
-  img.src = 'data:image/jpeg;base64,' + window.btoa(imageData);
+  img.src = imageUrl;
 }