The Tor Browser: browser/extensions/pdfjs/content/build/pdf.js@6474c204b198 (annotated)

browser/extensions/pdfjs/content/build/pdf.js@6474c204b198 (annotated)

browser/extensions/pdfjs/content/build/pdf.js

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
 /* Copyright 2012 Mozilla Foundation
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *     http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
 /*jshint globalstrict: false */
 // Initializing PDFJS global object (if still undefined)
 if (typeof PDFJS === 'undefined') {
   (typeof window !== 'undefined' ? window : this).PDFJS = {};
 }
 PDFJS.version = '1.0.68';
 PDFJS.build = 'ead4cbf';
 (function pdfjsWrapper() {
   // Use strict in our context only - users might not want it
   'use strict';
 /* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
 /* Copyright 2012 Mozilla Foundation
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *     http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
 /* globals Cmd, ColorSpace, Dict, MozBlobBuilder, Name, PDFJS, Ref, URL,
            Promise */
 'use strict';
 var globalScope = (typeof window === 'undefined') ? this : window;
 var isWorker = (typeof window == 'undefined');
 var FONT_IDENTITY_MATRIX = [0.001, 0, 0, 0.001, 0, 0];
 var TextRenderingMode = {
   FILL: 0,
   STROKE: 1,
   FILL_STROKE: 2,
   INVISIBLE: 3,
   FILL_ADD_TO_PATH: 4,
   STROKE_ADD_TO_PATH: 5,
   FILL_STROKE_ADD_TO_PATH: 6,
   ADD_TO_PATH: 7,
   FILL_STROKE_MASK: 3,
   ADD_TO_PATH_FLAG: 4
 };
 var ImageKind = {
   GRAYSCALE_1BPP: 1,
   RGB_24BPP: 2,
   RGBA_32BPP: 3
 };
 // The global PDFJS object exposes the API
 // In production, it will be declared outside a global wrapper
 // In development, it will be declared here
 if (!globalScope.PDFJS) {
   globalScope.PDFJS = {};
 }
 globalScope.PDFJS.pdfBug = false;
 PDFJS.VERBOSITY_LEVELS = {
   errors: 0,
   warnings: 1,
   infos: 5
 };
 // All the possible operations for an operator list.
 var OPS = PDFJS.OPS = {
   // Intentionally start from 1 so it is easy to spot bad operators that will be
   // 0's.
   dependency: 1,
   setLineWidth: 2,
   setLineCap: 3,
   setLineJoin: 4,
   setMiterLimit: 5,
   setDash: 6,
   setRenderingIntent: 7,
   setFlatness: 8,
   setGState: 9,
   save: 10,
   restore: 11,
   transform: 12,
   moveTo: 13,
   lineTo: 14,
   curveTo: 15,
   curveTo2: 16,
   curveTo3: 17,
   closePath: 18,
   rectangle: 19,
   stroke: 20,
   closeStroke: 21,
   fill: 22,
   eoFill: 23,
   fillStroke: 24,
   eoFillStroke: 25,
   closeFillStroke: 26,
   closeEOFillStroke: 27,
   endPath: 28,
   clip: 29,
   eoClip: 30,
   beginText: 31,
   endText: 32,
   setCharSpacing: 33,
   setWordSpacing: 34,
   setHScale: 35,
   setLeading: 36,
   setFont: 37,
   setTextRenderingMode: 38,
   setTextRise: 39,
   moveText: 40,
   setLeadingMoveText: 41,
   setTextMatrix: 42,
   nextLine: 43,
   showText: 44,
   showSpacedText: 45,
   nextLineShowText: 46,
   nextLineSetSpacingShowText: 47,
   setCharWidth: 48,
   setCharWidthAndBounds: 49,
   setStrokeColorSpace: 50,
   setFillColorSpace: 51,
   setStrokeColor: 52,
   setStrokeColorN: 53,
   setFillColor: 54,
   setFillColorN: 55,
   setStrokeGray: 56,
   setFillGray: 57,
   setStrokeRGBColor: 58,
   setFillRGBColor: 59,
   setStrokeCMYKColor: 60,
   setFillCMYKColor: 61,
   shadingFill: 62,
   beginInlineImage: 63,
   beginImageData: 64,
   endInlineImage: 65,
   paintXObject: 66,
   markPoint: 67,
   markPointProps: 68,
   beginMarkedContent: 69,
   beginMarkedContentProps: 70,
   endMarkedContent: 71,
   beginCompat: 72,
   endCompat: 73,
   paintFormXObjectBegin: 74,
   paintFormXObjectEnd: 75,
   beginGroup: 76,
   endGroup: 77,
   beginAnnotations: 78,
   endAnnotations: 79,
   beginAnnotation: 80,
   endAnnotation: 81,
   paintJpegXObject: 82,
   paintImageMaskXObject: 83,
   paintImageMaskXObjectGroup: 84,
   paintImageXObject: 85,
   paintInlineImageXObject: 86,
   paintInlineImageXObjectGroup: 87,
   paintImageXObjectRepeat: 88,
   paintImageMaskXObjectRepeat: 89,
   paintSolidColorImageMask: 90
 };
 // A notice for devs. These are good for things that are helpful to devs, such
 // as warning that Workers were disabled, which is important to devs but not
 // end users.
 function info(msg) {
   if (PDFJS.verbosity >= PDFJS.VERBOSITY_LEVELS.infos) {
     console.log('Info: ' + msg);
   }
 }
 // Non-fatal warnings.
 function warn(msg) {
   if (PDFJS.verbosity >= PDFJS.VERBOSITY_LEVELS.warnings) {
     console.log('Warning: ' + msg);
   }
 }
 // Fatal errors that should trigger the fallback UI and halt execution by
 // throwing an exception.
 function error(msg) {
   // If multiple arguments were passed, pass them all to the log function.
   if (arguments.length > 1) {
     var logArguments = ['Error:'];
     logArguments.push.apply(logArguments, arguments);
     console.log.apply(console, logArguments);
     // Join the arguments into a single string for the lines below.
     msg = [].join.call(arguments, ' ');
   } else {
     console.log('Error: ' + msg);
   }
   console.log(backtrace());
   UnsupportedManager.notify(UNSUPPORTED_FEATURES.unknown);
   throw new Error(msg);
 }
 function backtrace() {
   try {
     throw new Error();
   } catch (e) {
     return e.stack ? e.stack.split('\n').slice(2).join('\n') : '';
   }
 }
 function assert(cond, msg) {
   if (!cond) {
     error(msg);
   }
 }
 var UNSUPPORTED_FEATURES = PDFJS.UNSUPPORTED_FEATURES = {
   unknown: 'unknown',
   forms: 'forms',
   javaScript: 'javaScript',
   smask: 'smask',
   shadingPattern: 'shadingPattern',
   font: 'font'
 };
 var UnsupportedManager = PDFJS.UnsupportedManager =
   (function UnsupportedManagerClosure() {
   var listeners = [];
   return {
     listen: function (cb) {
       listeners.push(cb);
     },
     notify: function (featureId) {
       warn('Unsupported feature "' + featureId + '"');
       for (var i = 0, ii = listeners.length; i < ii; i++) {
         listeners[i](featureId);
       }
     }
   };
 })();
 // Combines two URLs. The baseUrl shall be absolute URL. If the url is an
 // absolute URL, it will be returned as is.
 function combineUrl(baseUrl, url) {
   if (!url) {
     return baseUrl;
   }
   if (/^[a-z][a-z0-9+\-.]*:/i.test(url)) {
     return url;
   }
   var i;
   if (url.charAt(0) == '/') {
     // absolute path
     i = baseUrl.indexOf('://');
     if (url.charAt(1) === '/') {
       ++i;
     } else {
       i = baseUrl.indexOf('/', i + 3);
     }
     return baseUrl.substring(0, i) + url;
   } else {
     // relative path
     var pathLength = baseUrl.length;
     i = baseUrl.lastIndexOf('#');
     pathLength = i >= 0 ? i : pathLength;
     i = baseUrl.lastIndexOf('?', pathLength);
     pathLength = i >= 0 ? i : pathLength;
     var prefixLength = baseUrl.lastIndexOf('/', pathLength);
     return baseUrl.substring(0, prefixLength + 1) + url;
   }
 }
 // Validates if URL is safe and allowed, e.g. to avoid XSS.
 function isValidUrl(url, allowRelative) {
   if (!url) {
     return false;
   }
   // RFC 3986 (http://tools.ietf.org/html/rfc3986#section-3.1)
   // scheme = ALPHA *( ALPHA / DIGIT / "+" / "-" / "." )
   var protocol = /^[a-z][a-z0-9+\-.]*(?=:)/i.exec(url);
   if (!protocol) {
     return allowRelative;
   }
   protocol = protocol[0].toLowerCase();
   switch (protocol) {
     case 'http':
     case 'https':
     case 'ftp':
     case 'mailto':
       return true;
     default:
       return false;
   }
 }
 PDFJS.isValidUrl = isValidUrl;
 function shadow(obj, prop, value) {
   Object.defineProperty(obj, prop, { value: value,
                                      enumerable: true,
                                      configurable: true,
                                      writable: false });
   return value;
 }
 var PasswordResponses = PDFJS.PasswordResponses = {
   NEED_PASSWORD: 1,
   INCORRECT_PASSWORD: 2
 };
 var PasswordException = (function PasswordExceptionClosure() {
   function PasswordException(msg, code) {
     this.name = 'PasswordException';
     this.message = msg;
     this.code = code;
   }
   PasswordException.prototype = new Error();
   PasswordException.constructor = PasswordException;
   return PasswordException;
 })();
 var UnknownErrorException = (function UnknownErrorExceptionClosure() {
   function UnknownErrorException(msg, details) {
     this.name = 'UnknownErrorException';
     this.message = msg;
     this.details = details;
   }
   UnknownErrorException.prototype = new Error();
   UnknownErrorException.constructor = UnknownErrorException;
   return UnknownErrorException;
 })();
 var InvalidPDFException = (function InvalidPDFExceptionClosure() {
   function InvalidPDFException(msg) {
     this.name = 'InvalidPDFException';
     this.message = msg;
   }
   InvalidPDFException.prototype = new Error();
   InvalidPDFException.constructor = InvalidPDFException;
   return InvalidPDFException;
 })();
 var MissingPDFException = (function MissingPDFExceptionClosure() {
   function MissingPDFException(msg) {
     this.name = 'MissingPDFException';
     this.message = msg;
   }
   MissingPDFException.prototype = new Error();
   MissingPDFException.constructor = MissingPDFException;
   return MissingPDFException;
 })();
 var NotImplementedException = (function NotImplementedExceptionClosure() {
   function NotImplementedException(msg) {
     this.message = msg;
   }
   NotImplementedException.prototype = new Error();
   NotImplementedException.prototype.name = 'NotImplementedException';
   NotImplementedException.constructor = NotImplementedException;
   return NotImplementedException;
 })();
 var MissingDataException = (function MissingDataExceptionClosure() {
   function MissingDataException(begin, end) {
     this.begin = begin;
     this.end = end;
     this.message = 'Missing data [' + begin + ', ' + end + ')';
   }
   MissingDataException.prototype = new Error();
   MissingDataException.prototype.name = 'MissingDataException';
   MissingDataException.constructor = MissingDataException;
   return MissingDataException;
 })();
 var XRefParseException = (function XRefParseExceptionClosure() {
   function XRefParseException(msg) {
     this.message = msg;
   }
   XRefParseException.prototype = new Error();
   XRefParseException.prototype.name = 'XRefParseException';
   XRefParseException.constructor = XRefParseException;
   return XRefParseException;
 })();
 function bytesToString(bytes) {
   var length = bytes.length;
   var MAX_ARGUMENT_COUNT = 8192;
   if (length < MAX_ARGUMENT_COUNT) {
     return String.fromCharCode.apply(null, bytes);
   }
   var strBuf = [];
   for (var i = 0; i < length; i += MAX_ARGUMENT_COUNT) {
     var chunkEnd = Math.min(i + MAX_ARGUMENT_COUNT, length);
     var chunk = bytes.subarray(i, chunkEnd);
     strBuf.push(String.fromCharCode.apply(null, chunk));
   }
   return strBuf.join('');
 }
 function stringToArray(str) {
   var length = str.length;
   var array = [];
   for (var i = 0; i < length; ++i) {
     array[i] = str.charCodeAt(i);
   }
   return array;
 }
 function stringToBytes(str) {
   var length = str.length;
   var bytes = new Uint8Array(length);
   for (var i = 0; i < length; ++i) {
     bytes[i] = str.charCodeAt(i) & 0xFF;
   }
   return bytes;
 }
 function string32(value) {
   return String.fromCharCode((value >> 24) & 0xff, (value >> 16) & 0xff,
                              (value >> 8) & 0xff, value & 0xff);
 }
 function log2(x) {
   var n = 1, i = 0;
   while (x > n) {
     n <<= 1;
     i++;
   }
   return i;
 }
 function readInt8(data, start) {
   return (data[start] << 24) >> 24;
 }
 function readUint16(data, offset) {
   return (data[offset] << 8) | data[offset + 1];
 }
 function readUint32(data, offset) {
   return ((data[offset] << 24) | (data[offset + 1] << 16) |
          (data[offset + 2] << 8) | data[offset + 3]) >>> 0;
 }
 // Lazy test the endianness of the platform
 // NOTE: This will be 'true' for simulated TypedArrays
 function isLittleEndian() {
   var buffer8 = new Uint8Array(2);
   buffer8[0] = 1;
   var buffer16 = new Uint16Array(buffer8.buffer);
   return (buffer16[0] === 1);
 }
 Object.defineProperty(PDFJS, 'isLittleEndian', {
   configurable: true,
   get: function PDFJS_isLittleEndian() {
     return shadow(PDFJS, 'isLittleEndian', isLittleEndian());
   }
 });
   PDFJS.hasCanvasTypedArrays = true;
 var IDENTITY_MATRIX = [1, 0, 0, 1, 0, 0];
 var Util = PDFJS.Util = (function UtilClosure() {
   function Util() {}
   Util.makeCssRgb = function Util_makeCssRgb(rgb) {
     return 'rgb(' + rgb[0] + ',' + rgb[1] + ',' + rgb[2] + ')';
   };
   Util.makeCssCmyk = function Util_makeCssCmyk(cmyk) {
     var rgb = ColorSpace.singletons.cmyk.getRgb(cmyk, 0);
     return Util.makeCssRgb(rgb);
   };
   // Concatenates two transformation matrices together and returns the result.
   Util.transform = function Util_transform(m1, m2) {
     return [
       m1[0] * m2[0] + m1[2] * m2[1],
       m1[1] * m2[0] + m1[3] * m2[1],
       m1[0] * m2[2] + m1[2] * m2[3],
       m1[1] * m2[2] + m1[3] * m2[3],
       m1[0] * m2[4] + m1[2] * m2[5] + m1[4],
       m1[1] * m2[4] + m1[3] * m2[5] + m1[5]
     ];
   };
   // For 2d affine transforms
   Util.applyTransform = function Util_applyTransform(p, m) {
     var xt = p[0] * m[0] + p[1] * m[2] + m[4];
     var yt = p[0] * m[1] + p[1] * m[3] + m[5];
     return [xt, yt];
   };
   Util.applyInverseTransform = function Util_applyInverseTransform(p, m) {
     var d = m[0] * m[3] - m[1] * m[2];
     var xt = (p[0] * m[3] - p[1] * m[2] + m[2] * m[5] - m[4] * m[3]) / d;
     var yt = (-p[0] * m[1] + p[1] * m[0] + m[4] * m[1] - m[5] * m[0]) / d;
     return [xt, yt];
   };
   // Applies the transform to the rectangle and finds the minimum axially
   // aligned bounding box.
   Util.getAxialAlignedBoundingBox =
     function Util_getAxialAlignedBoundingBox(r, m) {
     var p1 = Util.applyTransform(r, m);
     var p2 = Util.applyTransform(r.slice(2, 4), m);
     var p3 = Util.applyTransform([r[0], r[3]], m);
     var p4 = Util.applyTransform([r[2], r[1]], m);
     return [
       Math.min(p1[0], p2[0], p3[0], p4[0]),
       Math.min(p1[1], p2[1], p3[1], p4[1]),
       Math.max(p1[0], p2[0], p3[0], p4[0]),
       Math.max(p1[1], p2[1], p3[1], p4[1])
     ];
   };
   Util.inverseTransform = function Util_inverseTransform(m) {
     var d = m[0] * m[3] - m[1] * m[2];
     return [m[3] / d, -m[1] / d, -m[2] / d, m[0] / d,
       (m[2] * m[5] - m[4] * m[3]) / d, (m[4] * m[1] - m[5] * m[0]) / d];
   };
   // Apply a generic 3d matrix M on a 3-vector v:
   //   | a b c |   | X |
   //   | d e f | x | Y |
   //   | g h i |   | Z |
   // M is assumed to be serialized as [a,b,c,d,e,f,g,h,i],
   // with v as [X,Y,Z]
   Util.apply3dTransform = function Util_apply3dTransform(m, v) {
     return [
       m[0] * v[0] + m[1] * v[1] + m[2] * v[2],
       m[3] * v[0] + m[4] * v[1] + m[5] * v[2],
       m[6] * v[0] + m[7] * v[1] + m[8] * v[2]
     ];
   };
   // This calculation uses Singular Value Decomposition.
   // The SVD can be represented with formula A = USV. We are interested in the
   // matrix S here because it represents the scale values.
   Util.singularValueDecompose2dScale =
     function Util_singularValueDecompose2dScale(m) {
     var transpose = [m[0], m[2], m[1], m[3]];
     // Multiply matrix m with its transpose.
     var a = m[0] * transpose[0] + m[1] * transpose[2];
     var b = m[0] * transpose[1] + m[1] * transpose[3];
     var c = m[2] * transpose[0] + m[3] * transpose[2];
     var d = m[2] * transpose[1] + m[3] * transpose[3];
     // Solve the second degree polynomial to get roots.
     var first = (a + d) / 2;
     var second = Math.sqrt((a + d) * (a + d) - 4 * (a * d - c * b)) / 2;
     var sx = first + second || 1;
     var sy = first - second || 1;
     // Scale values are the square roots of the eigenvalues.
     return [Math.sqrt(sx), Math.sqrt(sy)];
   };
   // Normalize rectangle rect=[x1, y1, x2, y2] so that (x1,y1) < (x2,y2)
   // For coordinate systems whose origin lies in the bottom-left, this
   // means normalization to (BL,TR) ordering. For systems with origin in the
   // top-left, this means (TL,BR) ordering.
   Util.normalizeRect = function Util_normalizeRect(rect) {
     var r = rect.slice(0); // clone rect
     if (rect[0] > rect[2]) {
       r[0] = rect[2];
       r[2] = rect[0];
     }
     if (rect[1] > rect[3]) {
       r[1] = rect[3];
       r[3] = rect[1];
     }
     return r;
   };
   // Returns a rectangle [x1, y1, x2, y2] corresponding to the
   // intersection of rect1 and rect2. If no intersection, returns 'false'
   // The rectangle coordinates of rect1, rect2 should be [x1, y1, x2, y2]
   Util.intersect = function Util_intersect(rect1, rect2) {
     function compare(a, b) {
       return a - b;
     }
     // Order points along the axes
     var orderedX = [rect1[0], rect1[2], rect2[0], rect2[2]].sort(compare),
         orderedY = [rect1[1], rect1[3], rect2[1], rect2[3]].sort(compare),
         result = [];
     rect1 = Util.normalizeRect(rect1);
     rect2 = Util.normalizeRect(rect2);
     // X: first and second points belong to different rectangles?
     if ((orderedX[0] === rect1[0] && orderedX[1] === rect2[0]) ||
         (orderedX[0] === rect2[0] && orderedX[1] === rect1[0])) {
       // Intersection must be between second and third points
       result[0] = orderedX[1];
       result[2] = orderedX[2];
     } else {
       return false;
     }
     // Y: first and second points belong to different rectangles?
     if ((orderedY[0] === rect1[1] && orderedY[1] === rect2[1]) ||
         (orderedY[0] === rect2[1] && orderedY[1] === rect1[1])) {
       // Intersection must be between second and third points
       result[1] = orderedY[1];
       result[3] = orderedY[2];
     } else {
       return false;
     }
     return result;
   };
   Util.sign = function Util_sign(num) {
     return num < 0 ? -1 : 1;
   };
   // TODO(mack): Rename appendToArray
   Util.concatenateToArray = function concatenateToArray(arr1, arr2) {
     Array.prototype.push.apply(arr1, arr2);
   };
   Util.prependToArray = function concatenateToArray(arr1, arr2) {
     Array.prototype.unshift.apply(arr1, arr2);
   };
   Util.extendObj = function extendObj(obj1, obj2) {
     for (var key in obj2) {
       obj1[key] = obj2[key];
     }
   };
   Util.getInheritableProperty = function Util_getInheritableProperty(dict,
                                                                      name) {
     while (dict && !dict.has(name)) {
       dict = dict.get('Parent');
     }
     if (!dict) {
       return null;
     }
     return dict.get(name);
   };
   Util.inherit = function Util_inherit(sub, base, prototype) {
     sub.prototype = Object.create(base.prototype);
     sub.prototype.constructor = sub;
     for (var prop in prototype) {
       sub.prototype[prop] = prototype[prop];
     }
   };
   Util.loadScript = function Util_loadScript(src, callback) {
     var script = document.createElement('script');
     var loaded = false;
     script.setAttribute('src', src);
     if (callback) {
       script.onload = function() {
         if (!loaded) {
           callback();
         }
         loaded = true;
       };
     }
     document.getElementsByTagName('head')[0].appendChild(script);
   };
   return Util;
 })();
 var PageViewport = PDFJS.PageViewport = (function PageViewportClosure() {
   function PageViewport(viewBox, scale, rotation, offsetX, offsetY, dontFlip) {
     this.viewBox = viewBox;
     this.scale = scale;
     this.rotation = rotation;
     this.offsetX = offsetX;
     this.offsetY = offsetY;
     // creating transform to convert pdf coordinate system to the normal
     // canvas like coordinates taking in account scale and rotation
     var centerX = (viewBox[2] + viewBox[0]) / 2;
     var centerY = (viewBox[3] + viewBox[1]) / 2;
     var rotateA, rotateB, rotateC, rotateD;
     rotation = rotation % 360;
     rotation = rotation < 0 ? rotation + 360 : rotation;
     switch (rotation) {
       case 180:
         rotateA = -1; rotateB = 0; rotateC = 0; rotateD = 1;
         break;
       case 90:
         rotateA = 0; rotateB = 1; rotateC = 1; rotateD = 0;
         break;
       case 270:
         rotateA = 0; rotateB = -1; rotateC = -1; rotateD = 0;
         break;
       //case 0:
       default:
         rotateA = 1; rotateB = 0; rotateC = 0; rotateD = -1;
         break;
     }
     if (dontFlip) {
       rotateC = -rotateC; rotateD = -rotateD;
     }
     var offsetCanvasX, offsetCanvasY;
     var width, height;
     if (rotateA === 0) {
       offsetCanvasX = Math.abs(centerY - viewBox[1]) * scale + offsetX;
       offsetCanvasY = Math.abs(centerX - viewBox[0]) * scale + offsetY;
       width = Math.abs(viewBox[3] - viewBox[1]) * scale;
       height = Math.abs(viewBox[2] - viewBox[0]) * scale;
     } else {
       offsetCanvasX = Math.abs(centerX - viewBox[0]) * scale + offsetX;
       offsetCanvasY = Math.abs(centerY - viewBox[1]) * scale + offsetY;
       width = Math.abs(viewBox[2] - viewBox[0]) * scale;
       height = Math.abs(viewBox[3] - viewBox[1]) * scale;
     }
     // creating transform for the following operations:
     // translate(-centerX, -centerY), rotate and flip vertically,
     // scale, and translate(offsetCanvasX, offsetCanvasY)
     this.transform = [
       rotateA * scale,
       rotateB * scale,
       rotateC * scale,
       rotateD * scale,
       offsetCanvasX - rotateA * scale * centerX - rotateC * scale * centerY,
       offsetCanvasY - rotateB * scale * centerX - rotateD * scale * centerY
     ];
     this.width = width;
     this.height = height;
     this.fontScale = scale;
   }
   PageViewport.prototype = {
     clone: function PageViewPort_clone(args) {
       args = args || {};
       var scale = 'scale' in args ? args.scale : this.scale;
       var rotation = 'rotation' in args ? args.rotation : this.rotation;
       return new PageViewport(this.viewBox.slice(), scale, rotation,
                               this.offsetX, this.offsetY, args.dontFlip);
     },
     convertToViewportPoint: function PageViewport_convertToViewportPoint(x, y) {
       return Util.applyTransform([x, y], this.transform);
     },
     convertToViewportRectangle:
       function PageViewport_convertToViewportRectangle(rect) {
       var tl = Util.applyTransform([rect[0], rect[1]], this.transform);
       var br = Util.applyTransform([rect[2], rect[3]], this.transform);
       return [tl[0], tl[1], br[0], br[1]];
     },
     convertToPdfPoint: function PageViewport_convertToPdfPoint(x, y) {
       return Util.applyInverseTransform([x, y], this.transform);
     }
   };
   return PageViewport;
 })();
 var PDFStringTranslateTable = [
 , 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 x2D8, 0x2C7, 0x2C6, 0x2D9, 0x2DD, 0x2DB, 0x2DA, 0x2DC, 0, 0, 0, 0, 0, 0, 0,
 , 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 , 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 , 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 , 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x2022, 0x2020, 0x2021, 0x2026, 0x2014,
 x2013, 0x192, 0x2044, 0x2039, 0x203A, 0x2212, 0x2030, 0x201E, 0x201C,
 x201D, 0x2018, 0x2019, 0x201A, 0x2122, 0xFB01, 0xFB02, 0x141, 0x152, 0x160,
 x178, 0x17D, 0x131, 0x142, 0x153, 0x161, 0x17E, 0, 0x20AC
 ];
 function stringToPDFString(str) {
   var i, n = str.length, strBuf = [];
   if (str[0] === '\xFE' && str[1] === '\xFF') {
     // UTF16BE BOM
     for (i = 2; i < n; i += 2) {
       strBuf.push(String.fromCharCode(
         (str.charCodeAt(i) << 8) | str.charCodeAt(i + 1)));
     }
   } else {
     for (i = 0; i < n; ++i) {
       var code = PDFStringTranslateTable[str.charCodeAt(i)];
       strBuf.push(code ? String.fromCharCode(code) : str.charAt(i));
     }
   }
   return strBuf.join('');
 }
 function stringToUTF8String(str) {
   return decodeURIComponent(escape(str));
 }
 function isEmptyObj(obj) {
   for (var key in obj) {
     return false;
   }
   return true;
 }
 function isBool(v) {
   return typeof v == 'boolean';
 }
 function isInt(v) {
   return typeof v == 'number' && ((v | 0) == v);
 }
 function isNum(v) {
   return typeof v == 'number';
 }
 function isString(v) {
   return typeof v == 'string';
 }
 function isNull(v) {
   return v === null;
 }
 function isName(v) {
   return v instanceof Name;
 }
 function isCmd(v, cmd) {
   return v instanceof Cmd && (!cmd || v.cmd == cmd);
 }
 function isDict(v, type) {
   if (!(v instanceof Dict)) {
     return false;
   }
   if (!type) {
     return true;
   }
   var dictType = v.get('Type');
   return isName(dictType) && dictType.name == type;
 }
 function isArray(v) {
   return v instanceof Array;
 }
 function isStream(v) {
   return typeof v == 'object' && v !== null && v !== undefined &&
          ('getBytes' in v);
 }
 function isArrayBuffer(v) {
   return typeof v == 'object' && v !== null && v !== undefined &&
          ('byteLength' in v);
 }
 function isRef(v) {
   return v instanceof Ref;
 }
 function isPDFFunction(v) {
   var fnDict;
   if (typeof v != 'object') {
     return false;
   } else if (isDict(v)) {
     fnDict = v;
   } else if (isStream(v)) {
     fnDict = v.dict;
   } else {
     return false;
   }
   return fnDict.has('FunctionType');
 }
 /**
  * Legacy support for PDFJS Promise implementation.
  * TODO remove eventually
  * @ignore
  */
 var LegacyPromise = PDFJS.LegacyPromise = (function LegacyPromiseClosure() {
   return function LegacyPromise() {
     var resolve, reject;
     var promise = new Promise(function (resolve_, reject_) {
       resolve = resolve_;
       reject = reject_;
     });
     promise.resolve = resolve;
     promise.reject = reject;
     return promise;
   };
 })();
 /**
  * Polyfill for Promises:
  * The following promise implementation tries to generally implment the
  * Promise/A+ spec. Some notable differences from other promise libaries are:
  * - There currently isn't a seperate deferred and promise object.
  * - Unhandled rejections eventually show an error if they aren't handled.
  *
  * Based off of the work in:
  * https://bugzilla.mozilla.org/show_bug.cgi?id=810490
  */
 (function PromiseClosure() {
   if (globalScope.Promise) {
     // Promises existing in the DOM/Worker, checking presence of all/resolve
     if (typeof globalScope.Promise.all !== 'function') {
       globalScope.Promise.all = function (iterable) {
         var count = 0, results = [], resolve, reject;
         var promise = new globalScope.Promise(function (resolve_, reject_) {
           resolve = resolve_;
           reject = reject_;
         });
         iterable.forEach(function (p, i) {
           count++;
           p.then(function (result) {
             results[i] = result;
             count--;
             if (count === 0) {
               resolve(results);
             }
           }, reject);
         });
         if (count === 0) {
           resolve(results);
         }
         return promise;
       };
     }
     if (typeof globalScope.Promise.resolve !== 'function') {
       globalScope.Promise.resolve = function (x) {
         return new globalScope.Promise(function (resolve) { resolve(x); });
       };
     }
     return;
   }
   throw new Error('DOM Promise is not present');
 })();
 var StatTimer = (function StatTimerClosure() {
   function rpad(str, pad, length) {
     while (str.length < length) {
       str += pad;
     }
     return str;
   }
   function StatTimer() {
     this.started = {};
     this.times = [];
     this.enabled = true;
   }
   StatTimer.prototype = {
     time: function StatTimer_time(name) {
       if (!this.enabled) {
         return;
       }
       if (name in this.started) {
         warn('Timer is already running for ' + name);
       }
       this.started[name] = Date.now();
     },
     timeEnd: function StatTimer_timeEnd(name) {
       if (!this.enabled) {
         return;
       }
       if (!(name in this.started)) {
         warn('Timer has not been started for ' + name);
       }
       this.times.push({
         'name': name,
         'start': this.started[name],
         'end': Date.now()
       });
       // Remove timer from started so it can be called again.
       delete this.started[name];
     },
     toString: function StatTimer_toString() {
       var i, ii;
       var times = this.times;
       var out = '';
       // Find the longest name for padding purposes.
       var longest = 0;
       for (i = 0, ii = times.length; i < ii; ++i) {
         var name = times[i]['name'];
         if (name.length > longest) {
           longest = name.length;
         }
       }
       for (i = 0, ii = times.length; i < ii; ++i) {
         var span = times[i];
         var duration = span.end - span.start;
         out += rpad(span['name'], ' ', longest) + ' ' + duration + 'ms\n';
       }
       return out;
     }
   };
   return StatTimer;
 })();
 PDFJS.createBlob = function createBlob(data, contentType) {
   if (typeof Blob !== 'undefined') {
     return new Blob([data], { type: contentType });
   }
   // Blob builder is deprecated in FF14 and removed in FF18.
   var bb = new MozBlobBuilder();
   bb.append(data);
   return bb.getBlob(contentType);
 };
 PDFJS.createObjectURL = (function createObjectURLClosure() {
   // Blob/createObjectURL is not available, falling back to data schema.
   var digits =
     'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';
   return function createObjectURL(data, contentType) {
     if (!PDFJS.disableCreateObjectURL &&
         typeof URL !== 'undefined' && URL.createObjectURL) {
       var blob = PDFJS.createBlob(data, contentType);
       return URL.createObjectURL(blob);
     }
     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;
   this.callbackIndex = 1;
   this.postMessageTransfers = true;
   var callbacks = this.callbacks = {};
   var ah = this.actionHandler = {};
   ah['console_log'] = [function ahConsoleLog(data) {
     console.log.apply(console, data);
   }];
   ah['console_error'] = [function ahConsoleError(data) {
     console.error.apply(console, data);
   }];
   ah['_unsupported_feature'] = [function ah_unsupportedFeature(data) {
     UnsupportedManager.notify(data);
   }];
   comObj.onmessage = function messageHandlerComObjOnMessage(event) {
     var data = event.data;
     if (data.isReply) {
       var callbackId = data.callbackId;
       if (data.callbackId in callbacks) {
         var callback = callbacks[callbackId];
         delete callbacks[callbackId];
         callback(data.data);
       } else {
         error('Cannot resolve callback ' + callbackId);
       }
     } else if (data.action in ah) {
       var action = ah[data.action];
       if (data.callbackId) {
         var deferred = {};
         var promise = new Promise(function (resolve, reject) {
           deferred.resolve = resolve;
           deferred.reject = reject;
         });
         deferred.promise = promise;
         promise.then(function(resolvedData) {
           comObj.postMessage({
             isReply: true,
             callbackId: data.callbackId,
             data: resolvedData
           });
         });
         action[0].call(action[1], data.data, deferred);
       } else {
         action[0].call(action[1], data.data);
       }
     } else {
       error('Unkown action from worker: ' + data.action);
     }
   };
 }
 MessageHandler.prototype = {
   on: function messageHandlerOn(actionName, handler, scope) {
     var ah = this.actionHandler;
     if (ah[actionName]) {
       error('There is already an actionName called "' + actionName + '"');
     }
     ah[actionName] = [handler, scope];
   },
   /**
    * Sends a message to the comObj to invoke the action with the supplied data.
    * @param {String} actionName Action to call.
    * @param {JSON} data JSON data to send.
    * @param {function} [callback] Optional callback that will handle a reply.
    * @param {Array} [transfers] Optional list of transfers/ArrayBuffers
    */
   send: function messageHandlerSend(actionName, data, callback, transfers) {
     var message = {
       action: actionName,
       data: data
     };
     if (callback) {
       var callbackId = this.callbackIndex++;
       this.callbacks[callbackId] = callback;
       message.callbackId = callbackId;
     }
     if (transfers && this.postMessageTransfers) {
       this.comObj.postMessage(message, transfers);
     } else {
       this.comObj.postMessage(message);
     }
   }
 };
 function loadJpegStream(id, imageUrl, objs) {
   var img = new Image();
   img.onload = (function loadJpegStream_onloadClosure() {
     objs.resolve(id, img);
   });
   img.src = imageUrl;
 }
 var ColorSpace = (function ColorSpaceClosure() {
   // Constructor should define this.numComps, this.defaultColor, this.name
   function ColorSpace() {
     error('should not call ColorSpace constructor');
   }
   ColorSpace.prototype = {
     /**
      * Converts the color value to the RGB color. The color components are
      * located in the src array starting from the srcOffset. Returns the array
      * of the rgb components, each value ranging from [0,255].
      */
     getRgb: function ColorSpace_getRgb(src, srcOffset) {
       var rgb = new Uint8Array(3);
       this.getRgbItem(src, srcOffset, rgb, 0);
       return rgb;
     },
     /**
      * Converts the color value to the RGB color, similar to the getRgb method.
      * The result placed into the dest array starting from the destOffset.
      */
     getRgbItem: function ColorSpace_getRgbItem(src, srcOffset,
                                                dest, destOffset) {
       error('Should not call ColorSpace.getRgbItem');
     },
     /**
      * Converts the specified number of the color values to the RGB colors.
      * The colors are located in the src array starting from the srcOffset.
      * The result is placed into the dest array starting from the destOffset.
      * The src array items shall be in [0,2^bits) range, the dest array items
      * will be in [0,255] range. alpha01 indicates how many alpha components
      * there are in the dest array; it will be either 0 (RGB array) or 1 (RGBA
      * array).
      */
     getRgbBuffer: function ColorSpace_getRgbBuffer(src, srcOffset, count,
                                                    dest, destOffset, bits,
                                                    alpha01) {
       error('Should not call ColorSpace.getRgbBuffer');
     },
     /**
      * Determines the number of bytes required to store the result of the
      * conversion done by the getRgbBuffer method. As in getRgbBuffer,
      * |alpha01| is either 0 (RGB output) or 1 (RGBA output).
      */
     getOutputLength: function ColorSpace_getOutputLength(inputLength,
                                                          alpha01) {
       error('Should not call ColorSpace.getOutputLength');
     },
     /**
      * Returns true if source data will be equal the result/output data.
      */
     isPassthrough: function ColorSpace_isPassthrough(bits) {
       return false;
     },
     /**
      * Fills in the RGB colors in the destination buffer.  alpha01 indicates
      * how many alpha components there are in the dest array; it will be either
      * 0 (RGB array) or 1 (RGBA array).
      */
     fillRgb: function ColorSpace_fillRgb(dest, originalWidth,
                                          originalHeight, width, height,
                                          actualHeight, bpc, comps, alpha01) {
       var count = originalWidth * originalHeight;
       var rgbBuf = null;
       var numComponentColors = 1 << bpc;
       var needsResizing = originalHeight != height || originalWidth != width;
       var i, ii;
       if (this.isPassthrough(bpc)) {
         rgbBuf = comps;
       } else if (this.numComps === 1 && count > numComponentColors &&
           this.name !== 'DeviceGray' && this.name !== 'DeviceRGB') {
         // Optimization: create a color map when there is just one component and
         // we are converting more colors than the size of the color map. We
         // don't build the map if the colorspace is gray or rgb since those
         // methods are faster than building a map. This mainly offers big speed
         // ups for indexed and alternate colorspaces.
         //
         // TODO it may be worth while to cache the color map. While running
         // testing I never hit a cache so I will leave that out for now (perhaps
         // we are reparsing colorspaces too much?).
         var allColors = bpc <= 8 ? new Uint8Array(numComponentColors) :
                                    new Uint16Array(numComponentColors);
         var key;
         for (i = 0; i < numComponentColors; i++) {
           allColors[i] = i;
         }
         var colorMap = new Uint8Array(numComponentColors * 3);
         this.getRgbBuffer(allColors, 0, numComponentColors, colorMap, 0, bpc,
                           /* alpha01 = */ 0);
         var destPos, rgbPos;
         if (!needsResizing) {
           // Fill in the RGB values directly into |dest|.
           destPos = 0;
           for (i = 0; i < count; ++i) {
             key = comps[i] * 3;
             dest[destPos++] = colorMap[key];
             dest[destPos++] = colorMap[key + 1];
             dest[destPos++] = colorMap[key + 2];
             destPos += alpha01;
           }
         } else {
           rgbBuf = new Uint8Array(count * 3);
           rgbPos = 0;
           for (i = 0; i < count; ++i) {
             key = comps[i] * 3;
             rgbBuf[rgbPos++] = colorMap[key];
             rgbBuf[rgbPos++] = colorMap[key + 1];
             rgbBuf[rgbPos++] = colorMap[key + 2];
           }
         }
       } else {
         if (!needsResizing) {
           // Fill in the RGB values directly into |dest|.
           this.getRgbBuffer(comps, 0, width * actualHeight, dest, 0, bpc,
                             alpha01);
         } else {
           rgbBuf = new Uint8Array(count * 3);
           this.getRgbBuffer(comps, 0, count, rgbBuf, 0, bpc,
                             /* alpha01 = */ 0);
         }
       }
       if (rgbBuf) {
         if (needsResizing) {
           rgbBuf = PDFImage.resize(rgbBuf, bpc, 3, originalWidth,
                                    originalHeight, width, height);
         }
         rgbPos = 0;
         destPos = 0;
         for (i = 0, ii = width * actualHeight; i < ii; i++) {
           dest[destPos++] = rgbBuf[rgbPos++];
           dest[destPos++] = rgbBuf[rgbPos++];
           dest[destPos++] = rgbBuf[rgbPos++];
           destPos += alpha01;
         }
       }
     },
     /**
      * True if the colorspace has components in the default range of [0, 1].
      * This should be true for all colorspaces except for lab color spaces
      * which are [0,100], [-128, 127], [-128, 127].
      */
     usesZeroToOneRange: true
   };
   ColorSpace.parse = function ColorSpace_parse(cs, xref, res) {
     var IR = ColorSpace.parseToIR(cs, xref, res);
     if (IR instanceof AlternateCS) {
       return IR;
     }
     return ColorSpace.fromIR(IR);
   };
   ColorSpace.fromIR = function ColorSpace_fromIR(IR) {
     var name = isArray(IR) ? IR[0] : IR;
     var whitePoint, blackPoint;
     switch (name) {
       case 'DeviceGrayCS':
         return this.singletons.gray;
       case 'DeviceRgbCS':
         return this.singletons.rgb;
       case 'DeviceCmykCS':
         return this.singletons.cmyk;
       case 'CalGrayCS':
         whitePoint = IR[1].WhitePoint;
         blackPoint = IR[1].BlackPoint;
         var gamma = IR[1].Gamma;
         return new CalGrayCS(whitePoint, blackPoint, gamma);
       case 'PatternCS':
         var basePatternCS = IR[1];
         if (basePatternCS) {
           basePatternCS = ColorSpace.fromIR(basePatternCS);
         }
         return new PatternCS(basePatternCS);
       case 'IndexedCS':
         var baseIndexedCS = IR[1];
         var hiVal = IR[2];
         var lookup = IR[3];
         return new IndexedCS(ColorSpace.fromIR(baseIndexedCS), hiVal, lookup);
       case 'AlternateCS':
         var numComps = IR[1];
         var alt = IR[2];
         var tintFnIR = IR[3];
         return new AlternateCS(numComps, ColorSpace.fromIR(alt),
                                 PDFFunction.fromIR(tintFnIR));
       case 'LabCS':
         whitePoint = IR[1].WhitePoint;
         blackPoint = IR[1].BlackPoint;
         var range = IR[1].Range;
         return new LabCS(whitePoint, blackPoint, range);
       default:
         error('Unkown name ' + name);
     }
     return null;
   };
   ColorSpace.parseToIR = function ColorSpace_parseToIR(cs, xref, res) {
     if (isName(cs)) {
       var colorSpaces = res.get('ColorSpace');
       if (isDict(colorSpaces)) {
         var refcs = colorSpaces.get(cs.name);
         if (refcs) {
           cs = refcs;
         }
       }
     }
     cs = xref.fetchIfRef(cs);
     var mode;
     if (isName(cs)) {
       mode = cs.name;
       this.mode = mode;
       switch (mode) {
         case 'DeviceGray':
         case 'G':
           return 'DeviceGrayCS';
         case 'DeviceRGB':
         case 'RGB':
           return 'DeviceRgbCS';
         case 'DeviceCMYK':
         case 'CMYK':
           return 'DeviceCmykCS';
         case 'Pattern':
           return ['PatternCS', null];
         default:
           error('unrecognized colorspace ' + mode);
       }
     } else if (isArray(cs)) {
       mode = cs[0].name;
       this.mode = mode;
       var numComps, params;
       switch (mode) {
         case 'DeviceGray':
         case 'G':
           return 'DeviceGrayCS';
         case 'DeviceRGB':
         case 'RGB':
           return 'DeviceRgbCS';
         case 'DeviceCMYK':
         case 'CMYK':
           return 'DeviceCmykCS';
         case 'CalGray':
           params = cs[1].getAll();
           return ['CalGrayCS', params];
         case 'CalRGB':
           return 'DeviceRgbCS';
         case 'ICCBased':
           var stream = xref.fetchIfRef(cs[1]);
           var dict = stream.dict;
           numComps = dict.get('N');
           if (numComps == 1) {
             return 'DeviceGrayCS';
           } else if (numComps == 3) {
             return 'DeviceRgbCS';
           } else if (numComps == 4) {
             return 'DeviceCmykCS';
           }
           break;
         case 'Pattern':
           var basePatternCS = cs[1];
           if (basePatternCS) {
             basePatternCS = ColorSpace.parseToIR(basePatternCS, xref, res);
           }
           return ['PatternCS', basePatternCS];
         case 'Indexed':
         case 'I':
           var baseIndexedCS = ColorSpace.parseToIR(cs[1], xref, res);
           var hiVal = cs[2] + 1;
           var lookup = xref.fetchIfRef(cs[3]);
           if (isStream(lookup)) {
             lookup = lookup.getBytes();
           }
           return ['IndexedCS', baseIndexedCS, hiVal, lookup];
         case 'Separation':
         case 'DeviceN':
           var name = cs[1];
           numComps = 1;
           if (isName(name)) {
             numComps = 1;
           } else if (isArray(name)) {
             numComps = name.length;
           }
           var alt = ColorSpace.parseToIR(cs[2], xref, res);
           var tintFnIR = PDFFunction.getIR(xref, xref.fetchIfRef(cs[3]));
           return ['AlternateCS', numComps, alt, tintFnIR];
         case 'Lab':
           params = cs[1].getAll();
           return ['LabCS', params];
         default:
           error('unimplemented color space object "' + mode + '"');
       }
     } else {
       error('unrecognized color space object: "' + cs + '"');
     }
     return null;
   };
   /**
    * Checks if a decode map matches the default decode map for a color space.
    * This handles the general decode maps where there are two values per
    * component. e.g. [0, 1, 0, 1, 0, 1] for a RGB color.
    * This does not handle Lab, Indexed, or Pattern decode maps since they are
    * slightly different.
    * @param {Array} decode Decode map (usually from an image).
    * @param {Number} n Number of components the color space has.
    */
   ColorSpace.isDefaultDecode = function ColorSpace_isDefaultDecode(decode, n) {
     if (!decode) {
       return true;
     }
     if (n * 2 !== decode.length) {
       warn('The decode map is not the correct length');
       return true;
     }
     for (var i = 0, ii = decode.length; i < ii; i += 2) {
       if (decode[i] !== 0 || decode[i + 1] != 1) {
         return false;
       }
     }
     return true;
   };
   ColorSpace.singletons = {
     get gray() {
       return shadow(this, 'gray', new DeviceGrayCS());
     },
     get rgb() {
       return shadow(this, 'rgb', new DeviceRgbCS());
     },
     get cmyk() {
       return shadow(this, 'cmyk', new DeviceCmykCS());
     }
   };
   return ColorSpace;
 })();
 /**
  * Alternate color space handles both Separation and DeviceN color spaces.  A
  * Separation color space is actually just a DeviceN with one color component.
  * Both color spaces use a tinting function to convert colors to a base color
  * space.
  */
 var AlternateCS = (function AlternateCSClosure() {
   function AlternateCS(numComps, base, tintFn) {
     this.name = 'Alternate';
     this.numComps = numComps;
     this.defaultColor = new Float32Array(numComps);
     for (var i = 0; i < numComps; ++i) {
       this.defaultColor[i] = 1;
     }
     this.base = base;
     this.tintFn = tintFn;
   }
   AlternateCS.prototype = {
     getRgb: ColorSpace.prototype.getRgb,
     getRgbItem: function AlternateCS_getRgbItem(src, srcOffset,
                                                 dest, destOffset) {
       var baseNumComps = this.base.numComps;
       var input = 'subarray' in src ?
         src.subarray(srcOffset, srcOffset + this.numComps) :
         Array.prototype.slice.call(src, srcOffset, srcOffset + this.numComps);
       var tinted = this.tintFn(input);
       this.base.getRgbItem(tinted, 0, dest, destOffset);
     },
     getRgbBuffer: function AlternateCS_getRgbBuffer(src, srcOffset, count,
                                                     dest, destOffset, bits,
                                                     alpha01) {
       var tintFn = this.tintFn;
       var base = this.base;
       var scale = 1 / ((1 << bits) - 1);
       var baseNumComps = base.numComps;
       var usesZeroToOneRange = base.usesZeroToOneRange;
       var isPassthrough = (base.isPassthrough(8) || !usesZeroToOneRange) &&
                           alpha01 === 0;
       var pos = isPassthrough ? destOffset : 0;
       var baseBuf = isPassthrough ? dest : new Uint8Array(baseNumComps * count);
       var numComps = this.numComps;
       var scaled = new Float32Array(numComps);
       var i, j;
       for (i = 0; i < count; i++) {
         for (j = 0; j < numComps; j++) {
           scaled[j] = src[srcOffset++] * scale;
         }
         var tinted = tintFn(scaled);
         if (usesZeroToOneRange) {
           for (j = 0; j < baseNumComps; j++) {
             baseBuf[pos++] = tinted[j] * 255;
           }
         } else {
           base.getRgbItem(tinted, 0, baseBuf, pos);
           pos += baseNumComps;
         }
       }
       if (!isPassthrough) {
         base.getRgbBuffer(baseBuf, 0, count, dest, destOffset, 8, alpha01);
       }
     },
     getOutputLength: function AlternateCS_getOutputLength(inputLength,
                                                           alpha01) {
       return this.base.getOutputLength(inputLength *
                                        this.base.numComps / this.numComps,
                                        alpha01);
     },
     isPassthrough: ColorSpace.prototype.isPassthrough,
     fillRgb: ColorSpace.prototype.fillRgb,
     isDefaultDecode: function AlternateCS_isDefaultDecode(decodeMap) {
       return ColorSpace.isDefaultDecode(decodeMap, this.numComps);
     },
     usesZeroToOneRange: true
   };
   return AlternateCS;
 })();
 var PatternCS = (function PatternCSClosure() {
   function PatternCS(baseCS) {
     this.name = 'Pattern';
     this.base = baseCS;
   }
   PatternCS.prototype = {};
   return PatternCS;
 })();
 var IndexedCS = (function IndexedCSClosure() {
   function IndexedCS(base, highVal, lookup) {
     this.name = 'Indexed';
     this.numComps = 1;
     this.defaultColor = new Uint8Array([0]);
     this.base = base;
     this.highVal = highVal;
     var baseNumComps = base.numComps;
     var length = baseNumComps * highVal;
     var lookupArray;
     if (isStream(lookup)) {
       lookupArray = new Uint8Array(length);
       var bytes = lookup.getBytes(length);
       lookupArray.set(bytes);
     } else if (isString(lookup)) {
       lookupArray = new Uint8Array(length);
       for (var i = 0; i < length; ++i) {
         lookupArray[i] = lookup.charCodeAt(i);
       }
     } else if (lookup instanceof Uint8Array || lookup instanceof Array) {
       lookupArray = lookup;
     } else {
       error('Unrecognized lookup table: ' + lookup);
     }
     this.lookup = lookupArray;
   }
   IndexedCS.prototype = {
     getRgb: ColorSpace.prototype.getRgb,
     getRgbItem: function IndexedCS_getRgbItem(src, srcOffset,
                                               dest, destOffset) {
       var numComps = this.base.numComps;
       var start = src[srcOffset] * numComps;
       this.base.getRgbItem(this.lookup, start, dest, destOffset);
     },
     getRgbBuffer: function IndexedCS_getRgbBuffer(src, srcOffset, count,
                                                   dest, destOffset, bits,
                                                   alpha01) {
       var base = this.base;
       var numComps = base.numComps;
       var outputDelta = base.getOutputLength(numComps, alpha01);
       var lookup = this.lookup;
       for (var i = 0; i < count; ++i) {
         var lookupPos = src[srcOffset++] * numComps;
         base.getRgbBuffer(lookup, lookupPos, 1, dest, destOffset, 8, alpha01);
         destOffset += outputDelta;
       }
     },
     getOutputLength: function IndexedCS_getOutputLength(inputLength, alpha01) {
       return this.base.getOutputLength(inputLength * this.base.numComps,
                                        alpha01);
     },
     isPassthrough: ColorSpace.prototype.isPassthrough,
     fillRgb: ColorSpace.prototype.fillRgb,
     isDefaultDecode: function IndexedCS_isDefaultDecode(decodeMap) {
       // indexed color maps shouldn't be changed
       return true;
     },
     usesZeroToOneRange: true
   };
   return IndexedCS;
 })();
 var DeviceGrayCS = (function DeviceGrayCSClosure() {
   function DeviceGrayCS() {
     this.name = 'DeviceGray';
     this.numComps = 1;
     this.defaultColor = new Float32Array([0]);
   }
   DeviceGrayCS.prototype = {
     getRgb: ColorSpace.prototype.getRgb,
     getRgbItem: function DeviceGrayCS_getRgbItem(src, srcOffset,
                                                  dest, destOffset) {
       var c = (src[srcOffset] * 255) | 0;
       c = c < 0 ? 0 : c > 255 ? 255 : c;
       dest[destOffset] = dest[destOffset + 1] = dest[destOffset + 2] = c;
     },
     getRgbBuffer: function DeviceGrayCS_getRgbBuffer(src, srcOffset, count,
                                                      dest, destOffset, bits,
                                                      alpha01) {
       var scale = 255 / ((1 << bits) - 1);
       var j = srcOffset, q = destOffset;
       for (var i = 0; i < count; ++i) {
         var c = (scale * src[j++]) | 0;
         dest[q++] = c;
         dest[q++] = c;
         dest[q++] = c;
         q += alpha01;
       }
     },
     getOutputLength: function DeviceGrayCS_getOutputLength(inputLength,
                                                            alpha01) {
       return inputLength * (3 + alpha01);
     },
     isPassthrough: ColorSpace.prototype.isPassthrough,
     fillRgb: ColorSpace.prototype.fillRgb,
     isDefaultDecode: function DeviceGrayCS_isDefaultDecode(decodeMap) {
       return ColorSpace.isDefaultDecode(decodeMap, this.numComps);
     },
     usesZeroToOneRange: true
   };
   return DeviceGrayCS;
 })();
 var DeviceRgbCS = (function DeviceRgbCSClosure() {
   function DeviceRgbCS() {
     this.name = 'DeviceRGB';
     this.numComps = 3;
     this.defaultColor = new Float32Array([0, 0, 0]);
   }
   DeviceRgbCS.prototype = {
     getRgb: ColorSpace.prototype.getRgb,
     getRgbItem: function DeviceRgbCS_getRgbItem(src, srcOffset,
                                                 dest, destOffset) {
       var r = (src[srcOffset] * 255) | 0;
       var g = (src[srcOffset + 1] * 255) | 0;
       var b = (src[srcOffset + 2] * 255) | 0;
       dest[destOffset] = r < 0 ? 0 : r > 255 ? 255 : r;
       dest[destOffset + 1] = g < 0 ? 0 : g > 255 ? 255 : g;
       dest[destOffset + 2] = b < 0 ? 0 : b > 255 ? 255 : b;
     },
     getRgbBuffer: function DeviceRgbCS_getRgbBuffer(src, srcOffset, count,
                                                     dest, destOffset, bits,
                                                     alpha01) {
       if (bits === 8 && alpha01 === 0) {
         dest.set(src.subarray(srcOffset, srcOffset + count * 3), destOffset);
         return;
       }
       var scale = 255 / ((1 << bits) - 1);
       var j = srcOffset, q = destOffset;
       for (var i = 0; i < count; ++i) {
         dest[q++] = (scale * src[j++]) | 0;
         dest[q++] = (scale * src[j++]) | 0;
         dest[q++] = (scale * src[j++]) | 0;
         q += alpha01;
       }
     },
     getOutputLength: function DeviceRgbCS_getOutputLength(inputLength,
                                                           alpha01) {
       return (inputLength * (3 + alpha01) / 3) | 0;
     },
     isPassthrough: function DeviceRgbCS_isPassthrough(bits) {
       return bits == 8;
     },
     fillRgb: ColorSpace.prototype.fillRgb,
     isDefaultDecode: function DeviceRgbCS_isDefaultDecode(decodeMap) {
       return ColorSpace.isDefaultDecode(decodeMap, this.numComps);
     },
     usesZeroToOneRange: true
   };
   return DeviceRgbCS;
 })();
 var DeviceCmykCS = (function DeviceCmykCSClosure() {
   // The coefficients below was found using numerical analysis: the method of
   // steepest descent for the sum((f_i - color_value_i)^2) for r/g/b colors,
   // where color_value is the tabular value from the table of sampled RGB colors
   // from CMYK US Web Coated (SWOP) colorspace, and f_i is the corresponding
   // CMYK color conversion using the estimation below:
   //   f(A, B,.. N) = Acc+Bcm+Ccy+Dck+c+Fmm+Gmy+Hmk+Im+Jyy+Kyk+Ly+Mkk+Nk+255
   function convertToRgb(src, srcOffset, srcScale, dest, destOffset) {
     var c = src[srcOffset + 0] * srcScale;
     var m = src[srcOffset + 1] * srcScale;
     var y = src[srcOffset + 2] * srcScale;
     var k = src[srcOffset + 3] * srcScale;
     var r =
       (c * (-4.387332384609988 * c + 54.48615194189176 * m +
 .82290502165302 * y + 212.25662451639585 * k +
             -285.2331026137004) +
        m * (1.7149763477362134 * m - 5.6096736904047315 * y +
             -17.873870861415444 * k - 5.497006427196366) +
        y * (-2.5217340131683033 * y - 21.248923337353073 * k +
 .5119270841813) +
        k * (-21.86122147463605 * k - 189.48180835922747) + 255) | 0;
     var g =
       (c * (8.841041422036149 * c + 60.118027045597366 * m +
 .871425592049007 * y + 31.159100130055922 * k +
             -79.2970844816548) +
        m * (-15.310361306967817 * m + 17.575251261109482 * y +
 .35250912493976 * k - 190.9453302588951) +
        y * (4.444339102852739 * y + 9.8632861493405 * k - 24.86741582555878) +
        k * (-20.737325471181034 * k - 187.80453709719578) + 255) | 0;
     var b =
       (c * (0.8842522430003296 * c + 8.078677503112928 * m +
 .89978309703729 * y - 0.23883238689178934 * k +
             -14.183576799673286) +
        m * (10.49593273432072 * m + 63.02378494754052 * y +
 .606957656360734 * k - 112.23884253719248) +
        y * (0.03296041114873217 * y + 115.60384449646641 * k +
             -193.58209356861505) +
        k * (-22.33816807309886 * k - 180.12613974708367) + 255) | 0;
     dest[destOffset] = r > 255 ? 255 : r < 0 ? 0 : r;
     dest[destOffset + 1] = g > 255 ? 255 : g < 0 ? 0 : g;
     dest[destOffset + 2] = b > 255 ? 255 : b < 0 ? 0 : b;
   }
   function DeviceCmykCS() {
     this.name = 'DeviceCMYK';
     this.numComps = 4;
     this.defaultColor = new Float32Array([0, 0, 0, 1]);
   }
   DeviceCmykCS.prototype = {
     getRgb: ColorSpace.prototype.getRgb,
     getRgbItem: function DeviceCmykCS_getRgbItem(src, srcOffset,
                                                  dest, destOffset) {
       convertToRgb(src, srcOffset, 1, dest, destOffset);
     },
     getRgbBuffer: function DeviceCmykCS_getRgbBuffer(src, srcOffset, count,
                                                      dest, destOffset, bits,
                                                      alpha01) {
       var scale = 1 / ((1 << bits) - 1);
       for (var i = 0; i < count; i++) {
         convertToRgb(src, srcOffset, scale, dest, destOffset);
         srcOffset += 4;
         destOffset += 3 + alpha01;
       }
     },
     getOutputLength: function DeviceCmykCS_getOutputLength(inputLength,
                                                            alpha01) {
       return (inputLength / 4 * (3 + alpha01)) | 0;
     },
     isPassthrough: ColorSpace.prototype.isPassthrough,
     fillRgb: ColorSpace.prototype.fillRgb,
     isDefaultDecode: function DeviceCmykCS_isDefaultDecode(decodeMap) {
       return ColorSpace.isDefaultDecode(decodeMap, this.numComps);
     },
     usesZeroToOneRange: true
   };
   return DeviceCmykCS;
 })();
 //
 // CalGrayCS: Based on "PDF Reference, Sixth Ed", p.245
 //
 var CalGrayCS = (function CalGrayCSClosure() {
   function CalGrayCS(whitePoint, blackPoint, gamma) {
     this.name = 'CalGray';
     this.numComps = 1;
     this.defaultColor = new Float32Array([0]);
     if (!whitePoint) {
       error('WhitePoint missing - required for color space CalGray');
     }
     blackPoint = blackPoint || [0, 0, 0];
     gamma = gamma || 1;
     // Translate arguments to spec variables.
     this.XW = whitePoint[0];
     this.YW = whitePoint[1];
     this.ZW = whitePoint[2];
     this.XB = blackPoint[0];
     this.YB = blackPoint[1];
     this.ZB = blackPoint[2];
     this.G = gamma;
     // Validate variables as per spec.
     if (this.XW < 0 || this.ZW < 0 || this.YW !== 1) {
       error('Invalid WhitePoint components for ' + this.name +
             ', no fallback available');
     }
     if (this.XB < 0 || this.YB < 0 || this.ZB < 0) {
       info('Invalid BlackPoint for ' + this.name + ', falling back to default');
       this.XB = this.YB = this.ZB = 0;
     }
     if (this.XB !== 0 || this.YB !== 0 || this.ZB !== 0) {
       warn(this.name + ', BlackPoint: XB: ' + this.XB + ', YB: ' + this.YB +
            ', ZB: ' + this.ZB + ', only default values are supported.');
     }
     if (this.G < 1) {
       info('Invalid Gamma: ' + this.G + ' for ' + this.name +
            ', falling back to default');
       this.G = 1;
     }
   }
   function convertToRgb(cs, src, srcOffset, dest, destOffset, scale) {
     // A represents a gray component of a calibrated gray space.
     // A <---> AG in the spec
     var A = src[srcOffset] * scale;
     var AG = Math.pow(A, cs.G);
     // Computes intermediate variables M, L, N as per spec.
     // Except if other than default BlackPoint values are used.
     var M = cs.XW * AG;
     var L = cs.YW * AG;
     var N = cs.ZW * AG;
     // Decode XYZ, as per spec.
     var X = M;
     var Y = L;
     var Z = N;
     // http://www.poynton.com/notes/colour_and_gamma/ColorFAQ.html, Ch 4.
     // This yields values in range [0, 100].
     var Lstar = Math.max(116 * Math.pow(Y, 1 / 3) - 16, 0);
     // Convert values to rgb range [0, 255].
     dest[destOffset] = Lstar * 255 / 100;
     dest[destOffset + 1] = Lstar * 255 / 100;
     dest[destOffset + 2] = Lstar * 255 / 100;
   }
   CalGrayCS.prototype = {
     getRgb: ColorSpace.prototype.getRgb,
     getRgbItem: function CalGrayCS_getRgbItem(src, srcOffset,
                                               dest, destOffset) {
       convertToRgb(this, src, srcOffset, dest, destOffset, 1);
     },
     getRgbBuffer: function CalGrayCS_getRgbBuffer(src, srcOffset, count,
                                                   dest, destOffset, bits,
                                                   alpha01) {
       var scale = 1 / ((1 << bits) - 1);
       for (var i = 0; i < count; ++i) {
         convertToRgb(this, src, srcOffset, dest, destOffset, scale);
         srcOffset += 1;
         destOffset += 3 + alpha01;
       }
     },
     getOutputLength: function CalGrayCS_getOutputLength(inputLength, alpha01) {
       return inputLength * (3 + alpha01);
     },
     isPassthrough: ColorSpace.prototype.isPassthrough,
     fillRgb: ColorSpace.prototype.fillRgb,
     isDefaultDecode: function CalGrayCS_isDefaultDecode(decodeMap) {
       return ColorSpace.isDefaultDecode(decodeMap, this.numComps);
     },
     usesZeroToOneRange: true
   };
   return CalGrayCS;
 })();
 //
 // LabCS: Based on "PDF Reference, Sixth Ed", p.250
 //
 var LabCS = (function LabCSClosure() {
   function LabCS(whitePoint, blackPoint, range) {
     this.name = 'Lab';
     this.numComps = 3;
     this.defaultColor = new Float32Array([0, 0, 0]);
     if (!whitePoint) {
       error('WhitePoint missing - required for color space Lab');
     }
     blackPoint = blackPoint || [0, 0, 0];
     range = range || [-100, 100, -100, 100];
     // Translate args to spec variables
     this.XW = whitePoint[0];
     this.YW = whitePoint[1];
     this.ZW = whitePoint[2];
     this.amin = range[0];
     this.amax = range[1];
     this.bmin = range[2];
     this.bmax = range[3];
     // These are here just for completeness - the spec doesn't offer any
     // formulas that use BlackPoint in Lab
     this.XB = blackPoint[0];
     this.YB = blackPoint[1];
     this.ZB = blackPoint[2];
     // Validate vars as per spec
     if (this.XW < 0 || this.ZW < 0 || this.YW !== 1) {
       error('Invalid WhitePoint components, no fallback available');
     }
     if (this.XB < 0 || this.YB < 0 || this.ZB < 0) {
       info('Invalid BlackPoint, falling back to default');
       this.XB = this.YB = this.ZB = 0;
     }
     if (this.amin > this.amax || this.bmin > this.bmax) {
       info('Invalid Range, falling back to defaults');
       this.amin = -100;
       this.amax = 100;
       this.bmin = -100;
       this.bmax = 100;
     }
   }
   // Function g(x) from spec
   function fn_g(x) {
     if (x >= 6 / 29) {
       return x * x * x;
     } else {
       return (108 / 841) * (x - 4 / 29);
     }
   }
   function decode(value, high1, low2, high2) {
     return low2 + (value) * (high2 - low2) / (high1);
   }
   // If decoding is needed maxVal should be 2^bits per component - 1.
   function convertToRgb(cs, src, srcOffset, maxVal, dest, destOffset) {
     // XXX: Lab input is in the range of [0, 100], [amin, amax], [bmin, bmax]
     // not the usual [0, 1]. If a command like setFillColor is used the src
     // values will already be within the correct range. However, if we are
     // converting an image we have to map the values to the correct range given
     // above.
     // Ls,as,bs <---> L*,a*,b* in the spec
     var Ls = src[srcOffset];
     var as = src[srcOffset + 1];
     var bs = src[srcOffset + 2];
     if (maxVal !== false) {
       Ls = decode(Ls, maxVal, 0, 100);
       as = decode(as, maxVal, cs.amin, cs.amax);
       bs = decode(bs, maxVal, cs.bmin, cs.bmax);
     }
     // Adjust limits of 'as' and 'bs'
     as = as > cs.amax ? cs.amax : as < cs.amin ? cs.amin : as;
     bs = bs > cs.bmax ? cs.bmax : bs < cs.bmin ? cs.bmin : bs;
     // Computes intermediate variables X,Y,Z as per spec
     var M = (Ls + 16) / 116;
     var L = M + (as / 500);
     var N = M - (bs / 200);
     var X = cs.XW * fn_g(L);
     var Y = cs.YW * fn_g(M);
     var Z = cs.ZW * fn_g(N);
     var r, g, b;
     // Using different conversions for D50 and D65 white points,
     // per http://www.color.org/srgb.pdf
     if (cs.ZW < 1) {
       // Assuming D50 (X=0.9642, Y=1.00, Z=0.8249)
       r = X * 3.1339 + Y * -1.6170 + Z * -0.4906;
       g = X * -0.9785 + Y * 1.9160 + Z * 0.0333;
       b = X * 0.0720 + Y * -0.2290 + Z * 1.4057;
     } else {
       // Assuming D65 (X=0.9505, Y=1.00, Z=1.0888)
       r = X * 3.2406 + Y * -1.5372 + Z * -0.4986;
       g = X * -0.9689 + Y * 1.8758 + Z * 0.0415;
       b = X * 0.0557 + Y * -0.2040 + Z * 1.0570;
     }
     // clamp color values to [0,1] range then convert to [0,255] range.
     dest[destOffset] = r <= 0 ? 0 : r >= 1 ? 255 : Math.sqrt(r) * 255 | 0;
     dest[destOffset + 1] = g <= 0 ? 0 : g >= 1 ? 255 : Math.sqrt(g) * 255 | 0;
     dest[destOffset + 2] = b <= 0 ? 0 : b >= 1 ? 255 : Math.sqrt(b) * 255 | 0;
   }
   LabCS.prototype = {
     getRgb: ColorSpace.prototype.getRgb,
     getRgbItem: function LabCS_getRgbItem(src, srcOffset, dest, destOffset) {
       convertToRgb(this, src, srcOffset, false, dest, destOffset);
     },
     getRgbBuffer: function LabCS_getRgbBuffer(src, srcOffset, count,
                                               dest, destOffset, bits,
                                               alpha01) {
       var maxVal = (1 << bits) - 1;
       for (var i = 0; i < count; i++) {
         convertToRgb(this, src, srcOffset, maxVal, dest, destOffset);
         srcOffset += 3;
         destOffset += 3 + alpha01;
       }
     },
     getOutputLength: function LabCS_getOutputLength(inputLength, alpha01) {
       return (inputLength * (3 + alpha01) / 3) | 0;
     },
     isPassthrough: ColorSpace.prototype.isPassthrough,
     isDefaultDecode: function LabCS_isDefaultDecode(decodeMap) {
       // XXX: Decoding is handled with the lab conversion because of the strange
       // ranges that are used.
       return true;
     },
     usesZeroToOneRange: false
   };
   return LabCS;
 })();
 var PDFFunction = (function PDFFunctionClosure() {
   var CONSTRUCT_SAMPLED = 0;
   var CONSTRUCT_INTERPOLATED = 2;
   var CONSTRUCT_STICHED = 3;
   var CONSTRUCT_POSTSCRIPT = 4;
   return {
     getSampleArray: function PDFFunction_getSampleArray(size, outputSize, bps,
                                                        str) {
       var i, ii;
       var length = 1;
       for (i = 0, ii = size.length; i < ii; i++) {
         length *= size[i];
       }
       length *= outputSize;
       var array = [];
       var codeSize = 0;
       var codeBuf = 0;
       // 32 is a valid bps so shifting won't work
       var sampleMul = 1.0 / (Math.pow(2.0, bps) - 1);
       var strBytes = str.getBytes((length * bps + 7) / 8);
       var strIdx = 0;
       for (i = 0; i < length; i++) {
         while (codeSize < bps) {
           codeBuf <<= 8;
           codeBuf |= strBytes[strIdx++];
           codeSize += 8;
         }
         codeSize -= bps;
         array.push((codeBuf >> codeSize) * sampleMul);
         codeBuf &= (1 << codeSize) - 1;
       }
       return array;
     },
     getIR: function PDFFunction_getIR(xref, fn) {
       var dict = fn.dict;
       if (!dict) {
         dict = fn;
       }
       var types = [this.constructSampled,
                    null,
                    this.constructInterpolated,
                    this.constructStiched,
                    this.constructPostScript];
       var typeNum = dict.get('FunctionType');
       var typeFn = types[typeNum];
       if (!typeFn) {
         error('Unknown type of function');
       }
       return typeFn.call(this, fn, dict, xref);
     },
     fromIR: function PDFFunction_fromIR(IR) {
       var type = IR[0];
       switch (type) {
         case CONSTRUCT_SAMPLED:
           return this.constructSampledFromIR(IR);
         case CONSTRUCT_INTERPOLATED:
           return this.constructInterpolatedFromIR(IR);
         case CONSTRUCT_STICHED:
           return this.constructStichedFromIR(IR);
         //case CONSTRUCT_POSTSCRIPT:
         default:
           return this.constructPostScriptFromIR(IR);
       }
     },
     parse: function PDFFunction_parse(xref, fn) {
       var IR = this.getIR(xref, fn);
       return this.fromIR(IR);
     },
     constructSampled: function PDFFunction_constructSampled(str, dict) {
       function toMultiArray(arr) {
         var inputLength = arr.length;
         var out = [];
         var index = 0;
         for (var i = 0; i < inputLength; i += 2) {
           out[index] = [arr[i], arr[i + 1]];
           ++index;
         }
         return out;
       }
       var domain = dict.get('Domain');
       var range = dict.get('Range');
       if (!domain || !range) {
         error('No domain or range');
       }
       var inputSize = domain.length / 2;
       var outputSize = range.length / 2;
       domain = toMultiArray(domain);
       range = toMultiArray(range);
       var size = dict.get('Size');
       var bps = dict.get('BitsPerSample');
       var order = dict.get('Order') || 1;
       if (order !== 1) {
         // No description how cubic spline interpolation works in PDF32000:2008
         // As in poppler, ignoring order, linear interpolation may work as good
         info('No support for cubic spline interpolation: ' + order);
       }
       var encode = dict.get('Encode');
       if (!encode) {
         encode = [];
         for (var i = 0; i < inputSize; ++i) {
           encode.push(0);
           encode.push(size[i] - 1);
         }
       }
       encode = toMultiArray(encode);
       var decode = dict.get('Decode');
       if (!decode) {
         decode = range;
       } else {
         decode = toMultiArray(decode);
       }
       var samples = this.getSampleArray(size, outputSize, bps, str);
       return [
         CONSTRUCT_SAMPLED, inputSize, domain, encode, decode, samples, size,
         outputSize, Math.pow(2, bps) - 1, range
       ];
     },
     constructSampledFromIR: function PDFFunction_constructSampledFromIR(IR) {
       // See chapter 3, page 109 of the PDF reference
       function interpolate(x, xmin, xmax, ymin, ymax) {
         return ymin + ((x - xmin) * ((ymax - ymin) / (xmax - xmin)));
       }
       return function constructSampledFromIRResult(args) {
         // See chapter 3, page 110 of the PDF reference.
         var m = IR[1];
         var domain = IR[2];
         var encode = IR[3];
         var decode = IR[4];
         var samples = IR[5];
         var size = IR[6];
         var n = IR[7];
         //var mask = IR[8];
         var range = IR[9];
         if (m != args.length) {
           error('Incorrect number of arguments: ' + m + ' != ' +
                 args.length);
         }
         var x = args;
         // Building the cube vertices: its part and sample index
         // http://rjwagner49.com/Mathematics/Interpolation.pdf
         var cubeVertices = 1 << m;
         var cubeN = new Float64Array(cubeVertices);
         var cubeVertex = new Uint32Array(cubeVertices);
         var i, j;
         for (j = 0; j < cubeVertices; j++) {
           cubeN[j] = 1;
         }
         var k = n, pos = 1;
         // Map x_i to y_j for 0 <= i < m using the sampled function.
         for (i = 0; i < m; ++i) {
           // x_i' = min(max(x_i, Domain_2i), Domain_2i+1)
           var domain_2i = domain[i][0];
           var domain_2i_1 = domain[i][1];
           var xi = Math.min(Math.max(x[i], domain_2i), domain_2i_1);
           // e_i = Interpolate(x_i', Domain_2i, Domain_2i+1,
           //                   Encode_2i, Encode_2i+1)
           var e = interpolate(xi, domain_2i, domain_2i_1,
                               encode[i][0], encode[i][1]);
           // e_i' = min(max(e_i, 0), Size_i - 1)
           var size_i = size[i];
           e = Math.min(Math.max(e, 0), size_i - 1);
           // Adjusting the cube: N and vertex sample index
           var e0 = e < size_i - 1 ? Math.floor(e) : e - 1; // e1 = e0 + 1;
           var n0 = e0 + 1 - e; // (e1 - e) / (e1 - e0);
           var n1 = e - e0; // (e - e0) / (e1 - e0);
           var offset0 = e0 * k;
           var offset1 = offset0 + k; // e1 * k
           for (j = 0; j < cubeVertices; j++) {
             if (j & pos) {
               cubeN[j] *= n1;
               cubeVertex[j] += offset1;
             } else {
               cubeN[j] *= n0;
               cubeVertex[j] += offset0;
             }
           }
           k *= size_i;
           pos <<= 1;
         }
         var y = new Float64Array(n);
         for (j = 0; j < n; ++j) {
           // Sum all cube vertices' samples portions
           var rj = 0;
           for (i = 0; i < cubeVertices; i++) {
             rj += samples[cubeVertex[i] + j] * cubeN[i];
           }
           // r_j' = Interpolate(r_j, 0, 2^BitsPerSample - 1,
           //                    Decode_2j, Decode_2j+1)
           rj = interpolate(rj, 0, 1, decode[j][0], decode[j][1]);
           // y_j = min(max(r_j, range_2j), range_2j+1)
           y[j] = Math.min(Math.max(rj, range[j][0]), range[j][1]);
         }
         return y;
       };
     },
     constructInterpolated: function PDFFunction_constructInterpolated(str,
                                                                       dict) {
       var c0 = dict.get('C0') || [0];
       var c1 = dict.get('C1') || [1];
       var n = dict.get('N');
       if (!isArray(c0) || !isArray(c1)) {
         error('Illegal dictionary for interpolated function');
       }
       var length = c0.length;
       var diff = [];
       for (var i = 0; i < length; ++i) {
         diff.push(c1[i] - c0[i]);
       }
       return [CONSTRUCT_INTERPOLATED, c0, diff, n];
     },
     constructInterpolatedFromIR:
       function PDFFunction_constructInterpolatedFromIR(IR) {
       var c0 = IR[1];
       var diff = IR[2];
       var n = IR[3];
       var length = diff.length;
       return function constructInterpolatedFromIRResult(args) {
         var x = n == 1 ? args[0] : Math.pow(args[0], n);
         var out = [];
         for (var j = 0; j < length; ++j) {
           out.push(c0[j] + (x * diff[j]));
         }
         return out;
       };
     },
     constructStiched: function PDFFunction_constructStiched(fn, dict, xref) {
       var domain = dict.get('Domain');
       if (!domain) {
         error('No domain');
       }
       var inputSize = domain.length / 2;
       if (inputSize != 1) {
         error('Bad domain for stiched function');
       }
       var fnRefs = dict.get('Functions');
       var fns = [];
       for (var i = 0, ii = fnRefs.length; i < ii; ++i) {
         fns.push(PDFFunction.getIR(xref, xref.fetchIfRef(fnRefs[i])));
       }
       var bounds = dict.get('Bounds');
       var encode = dict.get('Encode');
       return [CONSTRUCT_STICHED, domain, bounds, encode, fns];
     },
     constructStichedFromIR: function PDFFunction_constructStichedFromIR(IR) {
       var domain = IR[1];
       var bounds = IR[2];
       var encode = IR[3];
       var fnsIR = IR[4];
       var fns = [];
       for (var i = 0, ii = fnsIR.length; i < ii; i++) {
         fns.push(PDFFunction.fromIR(fnsIR[i]));
       }
       return function constructStichedFromIRResult(args) {
         var clip = function constructStichedFromIRClip(v, min, max) {
           if (v > max) {
             v = max;
           } else if (v < min) {
             v = min;
           }
           return v;
         };
         // clip to domain
         var v = clip(args[0], domain[0], domain[1]);
         // calulate which bound the value is in
         for (var i = 0, ii = bounds.length; i < ii; ++i) {
           if (v < bounds[i]) {
             break;
           }
         }
         // encode value into domain of function
         var dmin = domain[0];
         if (i > 0) {
           dmin = bounds[i - 1];
         }
         var dmax = domain[1];
         if (i < bounds.length) {
           dmax = bounds[i];
         }
         var rmin = encode[2 * i];
         var rmax = encode[2 * i + 1];
         var v2 = rmin + (v - dmin) * (rmax - rmin) / (dmax - dmin);
         // call the appropriate function
         return fns[i]([v2]);
       };
     },
     constructPostScript: function PDFFunction_constructPostScript(fn, dict,
                                                                   xref) {
       var domain = dict.get('Domain');
       var range = dict.get('Range');
       if (!domain) {
         error('No domain.');
       }
       if (!range) {
         error('No range.');
       }
       var lexer = new PostScriptLexer(fn);
       var parser = new PostScriptParser(lexer);
       var code = parser.parse();
       return [CONSTRUCT_POSTSCRIPT, domain, range, code];
     },
     constructPostScriptFromIR: function PDFFunction_constructPostScriptFromIR(
                                           IR) {
       var domain = IR[1];
       var range = IR[2];
       var code = IR[3];
       var numOutputs = range.length / 2;
       var evaluator = new PostScriptEvaluator(code);
       // Cache the values for a big speed up, the cache size is limited though
       // since the number of possible values can be huge from a PS function.
       var cache = new FunctionCache();
       return function constructPostScriptFromIRResult(args) {
         var initialStack = [];
         for (var i = 0, ii = (domain.length / 2); i < ii; ++i) {
           initialStack.push(args[i]);
         }
         var key = initialStack.join('_');
         if (cache.has(key)) {
           return cache.get(key);
         }
         var stack = evaluator.execute(initialStack);
         var transformed = [];
         for (i = numOutputs - 1; i >= 0; --i) {
           var out = stack.pop();
           var rangeIndex = 2 * i;
           if (out < range[rangeIndex]) {
             out = range[rangeIndex];
           } else if (out > range[rangeIndex + 1]) {
             out = range[rangeIndex + 1];
           }
           transformed[i] = out;
         }
         cache.set(key, transformed);
         return transformed;
       };
     }
   };
 })();
 var FunctionCache = (function FunctionCacheClosure() {
   // Of 10 PDF's with type4 functions the maxium number of distinct values seen
   // was 256. This still may need some tweaking in the future though.
   var MAX_CACHE_SIZE = 1024;
   function FunctionCache() {
     this.cache = {};
     this.total = 0;
   }
   FunctionCache.prototype = {
     has: function FunctionCache_has(key) {
       return key in this.cache;
     },
     get: function FunctionCache_get(key) {
       return this.cache[key];
     },
     set: function FunctionCache_set(key, value) {
       if (this.total < MAX_CACHE_SIZE) {
         this.cache[key] = value;
         this.total++;
       }
     }
   };
   return FunctionCache;
 })();
 var PostScriptStack = (function PostScriptStackClosure() {
   var MAX_STACK_SIZE = 100;
   function PostScriptStack(initialStack) {
     this.stack = initialStack || [];
   }
   PostScriptStack.prototype = {
     push: function PostScriptStack_push(value) {
       if (this.stack.length >= MAX_STACK_SIZE) {
         error('PostScript function stack overflow.');
       }
       this.stack.push(value);
     },
     pop: function PostScriptStack_pop() {
       if (this.stack.length <= 0) {
         error('PostScript function stack underflow.');
       }
       return this.stack.pop();
     },
     copy: function PostScriptStack_copy(n) {
       if (this.stack.length + n >= MAX_STACK_SIZE) {
         error('PostScript function stack overflow.');
       }
       var stack = this.stack;
       for (var i = stack.length - n, j = n - 1; j >= 0; j--, i++) {
         stack.push(stack[i]);
       }
     },
     index: function PostScriptStack_index(n) {
       this.push(this.stack[this.stack.length - n - 1]);
     },
     // rotate the last n stack elements p times
     roll: function PostScriptStack_roll(n, p) {
       var stack = this.stack;
       var l = stack.length - n;
       var r = stack.length - 1, c = l + (p - Math.floor(p / n) * n), i, j, t;
       for (i = l, j = r; i < j; i++, j--) {
         t = stack[i]; stack[i] = stack[j]; stack[j] = t;
       }
       for (i = l, j = c - 1; i < j; i++, j--) {
         t = stack[i]; stack[i] = stack[j]; stack[j] = t;
       }
       for (i = c, j = r; i < j; i++, j--) {
         t = stack[i]; stack[i] = stack[j]; stack[j] = t;
       }
     }
   };
   return PostScriptStack;
 })();
 var PostScriptEvaluator = (function PostScriptEvaluatorClosure() {
   function PostScriptEvaluator(operators) {
     this.operators = operators;
   }
   PostScriptEvaluator.prototype = {
     execute: function PostScriptEvaluator_execute(initialStack) {
       var stack = new PostScriptStack(initialStack);
       var counter = 0;
       var operators = this.operators;
       var length = operators.length;
       var operator, a, b;
       while (counter < length) {
         operator = operators[counter++];
         if (typeof operator == 'number') {
           // Operator is really an operand and should be pushed to the stack.
           stack.push(operator);
           continue;
         }
         switch (operator) {
           // non standard ps operators
           case 'jz': // jump if false
             b = stack.pop();
             a = stack.pop();
             if (!a) {
               counter = b;
             }
             break;
           case 'j': // jump
             a = stack.pop();
             counter = a;
             break;
           // all ps operators in alphabetical order (excluding if/ifelse)
           case 'abs':
             a = stack.pop();
             stack.push(Math.abs(a));
             break;
           case 'add':
             b = stack.pop();
             a = stack.pop();
             stack.push(a + b);
             break;
           case 'and':
             b = stack.pop();
             a = stack.pop();
             if (isBool(a) && isBool(b)) {
               stack.push(a && b);
             } else {
               stack.push(a & b);
             }
             break;
           case 'atan':
             a = stack.pop();
             stack.push(Math.atan(a));
             break;
           case 'bitshift':
             b = stack.pop();
             a = stack.pop();
             if (a > 0) {
               stack.push(a << b);
             } else {
               stack.push(a >> b);
             }
             break;
           case 'ceiling':
             a = stack.pop();
             stack.push(Math.ceil(a));
             break;
           case 'copy':
             a = stack.pop();
             stack.copy(a);
             break;
           case 'cos':
             a = stack.pop();
             stack.push(Math.cos(a));
             break;
           case 'cvi':
             a = stack.pop() | 0;
             stack.push(a);
             break;
           case 'cvr':
             // noop
             break;
           case 'div':
             b = stack.pop();
             a = stack.pop();
             stack.push(a / b);
             break;
           case 'dup':
             stack.copy(1);
             break;
           case 'eq':
             b = stack.pop();
             a = stack.pop();
             stack.push(a == b);
             break;
           case 'exch':
             stack.roll(2, 1);
             break;
           case 'exp':
             b = stack.pop();
             a = stack.pop();
             stack.push(Math.pow(a, b));
             break;
           case 'false':
             stack.push(false);
             break;
           case 'floor':
             a = stack.pop();
             stack.push(Math.floor(a));
             break;
           case 'ge':
             b = stack.pop();
             a = stack.pop();
             stack.push(a >= b);
             break;
           case 'gt':
             b = stack.pop();
             a = stack.pop();
             stack.push(a > b);
             break;
           case 'idiv':
             b = stack.pop();
             a = stack.pop();
             stack.push((a / b) | 0);
             break;
           case 'index':
             a = stack.pop();
             stack.index(a);
             break;
           case 'le':
             b = stack.pop();
             a = stack.pop();
             stack.push(a <= b);
             break;
           case 'ln':
             a = stack.pop();
             stack.push(Math.log(a));
             break;
           case 'log':
             a = stack.pop();
             stack.push(Math.log(a) / Math.LN10);
             break;
           case 'lt':
             b = stack.pop();
             a = stack.pop();
             stack.push(a < b);
             break;
           case 'mod':
             b = stack.pop();
             a = stack.pop();
             stack.push(a % b);
             break;
           case 'mul':
             b = stack.pop();
             a = stack.pop();
             stack.push(a * b);
             break;
           case 'ne':
             b = stack.pop();
             a = stack.pop();
             stack.push(a != b);
             break;
           case 'neg':
             a = stack.pop();
             stack.push(-b);
             break;
           case 'not':
             a = stack.pop();
             if (isBool(a) && isBool(b)) {
               stack.push(a && b);
             } else {
               stack.push(a & b);
             }
             break;
           case 'or':
             b = stack.pop();
             a = stack.pop();
             if (isBool(a) && isBool(b)) {
               stack.push(a || b);
             } else {
               stack.push(a | b);
             }
             break;
           case 'pop':
             stack.pop();
             break;
           case 'roll':
             b = stack.pop();
             a = stack.pop();
             stack.roll(a, b);
             break;
           case 'round':
             a = stack.pop();
             stack.push(Math.round(a));
             break;
           case 'sin':
             a = stack.pop();
             stack.push(Math.sin(a));
             break;
           case 'sqrt':
             a = stack.pop();
             stack.push(Math.sqrt(a));
             break;
           case 'sub':
             b = stack.pop();
             a = stack.pop();
             stack.push(a - b);
             break;
           case 'true':
             stack.push(true);
             break;
           case 'truncate':
             a = stack.pop();
             a = a < 0 ? Math.ceil(a) : Math.floor(a);
             stack.push(a);
             break;
           case 'xor':
             b = stack.pop();
             a = stack.pop();
             if (isBool(a) && isBool(b)) {
               stack.push(a != b);
             } else {
               stack.push(a ^ b);
             }
             break;
           default:
             error('Unknown operator ' + operator);
             break;
         }
       }
       return stack.stack;
     }
   };
   return PostScriptEvaluator;
 })();
 var HIGHLIGHT_OFFSET = 4; // px
 var SUPPORTED_TYPES = ['Link', 'Text', 'Widget'];
 var Annotation = (function AnnotationClosure() {
   // 12.5.5: Algorithm: Appearance streams
   function getTransformMatrix(rect, bbox, matrix) {
     var bounds = Util.getAxialAlignedBoundingBox(bbox, matrix);
     var minX = bounds[0];
     var minY = bounds[1];
     var maxX = bounds[2];
     var maxY = bounds[3];
     if (minX === maxX || minY === maxY) {
       // From real-life file, bbox was [0, 0, 0, 0]. In this case,
       // just apply the transform for rect
       return [1, 0, 0, 1, rect[0], rect[1]];
     }
     var xRatio = (rect[2] - rect[0]) / (maxX - minX);
     var yRatio = (rect[3] - rect[1]) / (maxY - minY);
     return [
       xRatio,
 ,
 ,
       yRatio,
       rect[0] - minX * xRatio,
       rect[1] - minY * yRatio
     ];
   }
   function getDefaultAppearance(dict) {
     var appearanceState = dict.get('AP');
     if (!isDict(appearanceState)) {
       return;
     }
     var appearance;
     var appearances = appearanceState.get('N');
     if (isDict(appearances)) {
       var as = dict.get('AS');
       if (as && appearances.has(as.name)) {
         appearance = appearances.get(as.name);
       }
     } else {
       appearance = appearances;
     }
     return appearance;
   }
   function Annotation(params) {
     if (params.data) {
       this.data = params.data;
       return;
     }
     var dict = params.dict;
     var data = this.data = {};
     data.subtype = dict.get('Subtype').name;
     var rect = dict.get('Rect') || [0, 0, 0, 0];
     data.rect = Util.normalizeRect(rect);
     data.annotationFlags = dict.get('F');
     var color = dict.get('C');
     if (isArray(color) && color.length === 3) {
       // TODO(mack): currently only supporting rgb; need support different
       // colorspaces
       data.color = color;
     } else {
       data.color = [0, 0, 0];
     }
     // Some types of annotations have border style dict which has more
     // info than the border array
     if (dict.has('BS')) {
       var borderStyle = dict.get('BS');
       data.borderWidth = borderStyle.has('W') ? borderStyle.get('W') : 1;
     } else {
       var borderArray = dict.get('Border') || [0, 0, 1];
       data.borderWidth = borderArray[2] || 0;
       // TODO: implement proper support for annotations with line dash patterns.
       var dashArray = borderArray[3];
       if (data.borderWidth > 0 && dashArray && isArray(dashArray)) {
         var dashArrayLength = dashArray.length;
         if (dashArrayLength > 0) {
           // According to the PDF specification: the elements in a dashArray
           // shall be numbers that are nonnegative and not all equal to zero.
           var isInvalid = false;
           var numPositive = 0;
           for (var i = 0; i < dashArrayLength; i++) {
             var validNumber = (+dashArray[i] >= 0);
             if (!validNumber) {
               isInvalid = true;
               break;
             } else if (dashArray[i] > 0) {
               numPositive++;
             }
           }
           if (isInvalid || numPositive === 0) {
             data.borderWidth = 0;
           }
         }
       }
     }
     this.appearance = getDefaultAppearance(dict);
     data.hasAppearance = !!this.appearance;
     data.id = params.ref.num;
   }
   Annotation.prototype = {
     getData: function Annotation_getData() {
       return this.data;
     },
     hasHtml: function Annotation_hasHtml() {
       return false;
     },
     getHtmlElement: function Annotation_getHtmlElement(commonObjs) {
       throw new NotImplementedException(
         'getHtmlElement() should be implemented in subclass');
     },
     // TODO(mack): Remove this, it's not really that helpful.
     getEmptyContainer: function Annotation_getEmptyContainer(tagName, rect,
                                                              borderWidth) {
       assert(!isWorker,
         'getEmptyContainer() should be called from main thread');
       var bWidth = borderWidth || 0;
       rect = rect || this.data.rect;
       var element = document.createElement(tagName);
       element.style.borderWidth = bWidth + 'px';
       var width = rect[2] - rect[0] - 2 * bWidth;
       var height = rect[3] - rect[1] - 2 * bWidth;
       element.style.width = width + 'px';
       element.style.height = height + 'px';
       return element;
     },
     isInvisible: function Annotation_isInvisible() {
       var data = this.data;
       if (data && SUPPORTED_TYPES.indexOf(data.subtype) !== -1) {
         return false;
       } else {
         return !!(data &&
                   data.annotationFlags &&            // Default: not invisible
                   data.annotationFlags & 0x1);       // Invisible
       }
     },
     isViewable: function Annotation_isViewable() {
       var data = this.data;
       return !!(!this.isInvisible() &&
                 data &&
                 (!data.annotationFlags ||
                  !(data.annotationFlags & 0x22)) &&  // Hidden or NoView
                 data.rect);                          // rectangle is nessessary
     },
     isPrintable: function Annotation_isPrintable() {
       var data = this.data;
       return !!(!this.isInvisible() &&
                 data &&
                 data.annotationFlags &&              // Default: not printable
                 data.annotationFlags & 0x4 &&        // Print
                 data.rect);                          // rectangle is nessessary
     },
     loadResources: function(keys) {
       var promise = new LegacyPromise();
       this.appearance.dict.getAsync('Resources').then(function(resources) {
         if (!resources) {
           promise.resolve();
           return;
         }
         var objectLoader = new ObjectLoader(resources.map,
                                             keys,
                                             resources.xref);
         objectLoader.load().then(function() {
           promise.resolve(resources);
         });
       }.bind(this));
       return promise;
     },
     getOperatorList: function Annotation_getOperatorList(evaluator) {
       var promise = new LegacyPromise();
       if (!this.appearance) {
         promise.resolve(new OperatorList());
         return promise;
       }
       var data = this.data;
       var appearanceDict = this.appearance.dict;
       var resourcesPromise = this.loadResources([
         'ExtGState',
         'ColorSpace',
         'Pattern',
         'Shading',
         'XObject',
         'Font'
         // ProcSet
         // Properties
       ]);
       var bbox = appearanceDict.get('BBox') || [0, 0, 1, 1];
       var matrix = appearanceDict.get('Matrix') || [1, 0, 0, 1, 0 ,0];
       var transform = getTransformMatrix(data.rect, bbox, matrix);
       resourcesPromise.then(function(resources) {
         var opList = new OperatorList();
         opList.addOp(OPS.beginAnnotation, [data.rect, transform, matrix]);
         evaluator.getOperatorList(this.appearance, resources, opList);
         opList.addOp(OPS.endAnnotation, []);
         promise.resolve(opList);
         this.appearance.reset();
       }.bind(this));
       return promise;
     }
   };
   Annotation.getConstructor =
       function Annotation_getConstructor(subtype, fieldType) {
     if (!subtype) {
       return;
     }
     // TODO(mack): Implement FreeText annotations
     if (subtype === 'Link') {
       return LinkAnnotation;
     } else if (subtype === 'Text') {
       return TextAnnotation;
     } else if (subtype === 'Widget') {
       if (!fieldType) {
         return;
       }
       if (fieldType === 'Tx') {
         return TextWidgetAnnotation;
       } else {
         return WidgetAnnotation;
       }
     } else {
       return Annotation;
     }
   };
   // TODO(mack): Support loading annotation from data
   Annotation.fromData = function Annotation_fromData(data) {
     var subtype = data.subtype;
     var fieldType = data.fieldType;
     var Constructor = Annotation.getConstructor(subtype, fieldType);
     if (Constructor) {
       return new Constructor({ data: data });
     }
   };
   Annotation.fromRef = function Annotation_fromRef(xref, ref) {
     var dict = xref.fetchIfRef(ref);
     if (!isDict(dict)) {
       return;
     }
     var subtype = dict.get('Subtype');
     subtype = isName(subtype) ? subtype.name : '';
     if (!subtype) {
       return;
     }
     var fieldType = Util.getInheritableProperty(dict, 'FT');
     fieldType = isName(fieldType) ? fieldType.name : '';
     var Constructor = Annotation.getConstructor(subtype, fieldType);
     if (!Constructor) {
       return;
     }
     var params = {
       dict: dict,
       ref: ref,
     };
     var annotation = new Constructor(params);
     if (annotation.isViewable() || annotation.isPrintable()) {
       return annotation;
     } else {
       warn('unimplemented annotation type: ' + subtype);
     }
   };
   Annotation.appendToOperatorList = function Annotation_appendToOperatorList(
       annotations, opList, pdfManager, partialEvaluator, intent) {
     function reject(e) {
       annotationsReadyPromise.reject(e);
     }
     var annotationsReadyPromise = new LegacyPromise();
     var annotationPromises = [];
     for (var i = 0, n = annotations.length; i < n; ++i) {
       if (intent === 'display' && annotations[i].isViewable() ||
           intent === 'print' && annotations[i].isPrintable()) {
         annotationPromises.push(
           annotations[i].getOperatorList(partialEvaluator));
       }
     }
     Promise.all(annotationPromises).then(function(datas) {
       opList.addOp(OPS.beginAnnotations, []);
       for (var i = 0, n = datas.length; i < n; ++i) {
         var annotOpList = datas[i];
         opList.addOpList(annotOpList);
       }
       opList.addOp(OPS.endAnnotations, []);
       annotationsReadyPromise.resolve();
     }, reject);
     return annotationsReadyPromise;
   };
   return Annotation;
 })();
 PDFJS.Annotation = Annotation;
 var WidgetAnnotation = (function WidgetAnnotationClosure() {
   function WidgetAnnotation(params) {
     Annotation.call(this, params);
     if (params.data) {
       return;
     }
     var dict = params.dict;
     var data = this.data;
     data.fieldValue = stringToPDFString(
       Util.getInheritableProperty(dict, 'V') || '');
     data.alternativeText = stringToPDFString(dict.get('TU') || '');
     data.defaultAppearance = Util.getInheritableProperty(dict, 'DA') || '';
     var fieldType = Util.getInheritableProperty(dict, 'FT');
     data.fieldType = isName(fieldType) ? fieldType.name : '';
     data.fieldFlags = Util.getInheritableProperty(dict, 'Ff') || 0;
     this.fieldResources = Util.getInheritableProperty(dict, 'DR') || Dict.empty;
     // Building the full field name by collecting the field and
     // its ancestors 'T' data and joining them using '.'.
     var fieldName = [];
     var namedItem = dict;
     var ref = params.ref;
     while (namedItem) {
       var parent = namedItem.get('Parent');
       var parentRef = namedItem.getRaw('Parent');
       var name = namedItem.get('T');
       if (name) {
         fieldName.unshift(stringToPDFString(name));
       } else {
         // The field name is absent, that means more than one field
         // with the same name may exist. Replacing the empty name
         // with the '`' plus index in the parent's 'Kids' array.
         // This is not in the PDF spec but necessary to id the
         // the input controls.
         var kids = parent.get('Kids');
         var j, jj;
         for (j = 0, jj = kids.length; j < jj; j++) {
           var kidRef = kids[j];
           if (kidRef.num == ref.num && kidRef.gen == ref.gen) {
             break;
           }
         }
         fieldName.unshift('`' + j);
       }
       namedItem = parent;
       ref = parentRef;
     }
     data.fullName = fieldName.join('.');
   }
   var parent = Annotation.prototype;
   Util.inherit(WidgetAnnotation, Annotation, {
     isViewable: function WidgetAnnotation_isViewable() {
       if (this.data.fieldType === 'Sig') {
         warn('unimplemented annotation type: Widget signature');
         return false;
       }
       return parent.isViewable.call(this);
     }
   });
   return WidgetAnnotation;
 })();
 var TextWidgetAnnotation = (function TextWidgetAnnotationClosure() {
   function TextWidgetAnnotation(params) {
     WidgetAnnotation.call(this, params);
     if (params.data) {
       return;
     }
     this.data.textAlignment = Util.getInheritableProperty(params.dict, 'Q');
   }
   // TODO(mack): This dupes some of the logic in CanvasGraphics.setFont()
   function setTextStyles(element, item, fontObj) {
     var style = element.style;
     style.fontSize = item.fontSize + 'px';
     style.direction = item.fontDirection < 0 ? 'rtl': 'ltr';
     if (!fontObj) {
       return;
     }
     style.fontWeight = fontObj.black ?
                             (fontObj.bold ? 'bolder' : 'bold') :
                             (fontObj.bold ? 'bold' : 'normal');
     style.fontStyle = fontObj.italic ? 'italic' : 'normal';
     var fontName = fontObj.loadedName;
     var fontFamily = fontName ? '"' + fontName + '", ' : '';
     // Use a reasonable default font if the font doesn't specify a fallback
     var fallbackName = fontObj.fallbackName || 'Helvetica, sans-serif';
     style.fontFamily = fontFamily + fallbackName;
   }
   Util.inherit(TextWidgetAnnotation, WidgetAnnotation, {
     hasHtml: function TextWidgetAnnotation_hasHtml() {
       return !this.data.hasAppearance && !!this.data.fieldValue;
     },
     getHtmlElement: function TextWidgetAnnotation_getHtmlElement(commonObjs) {
       assert(!isWorker, 'getHtmlElement() shall be called from main thread');
       var item = this.data;
       var element = this.getEmptyContainer('div');
       element.style.display = 'table';
       var content = document.createElement('div');
       content.textContent = item.fieldValue;
       var textAlignment = item.textAlignment;
       content.style.textAlign = ['left', 'center', 'right'][textAlignment];
       content.style.verticalAlign = 'middle';
       content.style.display = 'table-cell';
       var fontObj = item.fontRefName ?
                     commonObjs.getData(item.fontRefName) : null;
       setTextStyles(content, item, fontObj);
       element.appendChild(content);
       return element;
     },
     getOperatorList: function TextWidgetAnnotation_getOperatorList(evaluator) {
       if (this.appearance) {
         return Annotation.prototype.getOperatorList.call(this, evaluator);
       }
       var promise = new LegacyPromise();
       var opList = new OperatorList();
       var data = this.data;
       // Even if there is an appearance stream, ignore it. This is the
       // behaviour used by Adobe Reader.
       var defaultAppearance = data.defaultAppearance;
       if (!defaultAppearance) {
         promise.resolve(opList);
         return promise;
       }
       // Include any font resources found in the default appearance
       var stream = new Stream(stringToBytes(defaultAppearance));
       evaluator.getOperatorList(stream, this.fieldResources, opList);
       var appearanceFnArray = opList.fnArray;
       var appearanceArgsArray = opList.argsArray;
       var fnArray = [];
       // TODO(mack): Add support for stroke color
       data.rgb = [0, 0, 0];
       // TODO THIS DOESN'T MAKE ANY SENSE SINCE THE fnArray IS EMPTY!
       for (var i = 0, n = fnArray.length; i < n; ++i) {
         var fnId = appearanceFnArray[i];
         var args = appearanceArgsArray[i];
         if (fnId === OPS.setFont) {
           data.fontRefName = args[0];
           var size = args[1];
           if (size < 0) {
             data.fontDirection = -1;
             data.fontSize = -size;
           } else {
             data.fontDirection = 1;
             data.fontSize = size;
           }
         } else if (fnId === OPS.setFillRGBColor) {
           data.rgb = args;
         } else if (fnId === OPS.setFillGray) {
           var rgbValue = args[0] * 255;
           data.rgb = [rgbValue, rgbValue, rgbValue];
         }
       }
       promise.resolve(opList);
       return promise;
     }
   });
   return TextWidgetAnnotation;
 })();
 var InteractiveAnnotation = (function InteractiveAnnotationClosure() {
   function InteractiveAnnotation(params) {
     Annotation.call(this, params);
   }
   Util.inherit(InteractiveAnnotation, Annotation, {
     hasHtml: function InteractiveAnnotation_hasHtml() {
       return true;
     },
     highlight: function InteractiveAnnotation_highlight() {
       if (this.highlightElement &&
          this.highlightElement.hasAttribute('hidden')) {
         this.highlightElement.removeAttribute('hidden');
       }
     },
     unhighlight: function InteractiveAnnotation_unhighlight() {
       if (this.highlightElement &&
          !this.highlightElement.hasAttribute('hidden')) {
         this.highlightElement.setAttribute('hidden', true);
       }
     },
     initContainer: function InteractiveAnnotation_initContainer() {
       var item = this.data;
       var rect = item.rect;
       var container = this.getEmptyContainer('section', rect, item.borderWidth);
       container.style.backgroundColor = item.color;
       var color = item.color;
       var rgb = [];
       for (var i = 0; i < 3; ++i) {
         rgb[i] = Math.round(color[i] * 255);
       }
       item.colorCssRgb = Util.makeCssRgb(rgb);
       var highlight = document.createElement('div');
       highlight.className = 'annotationHighlight';
       highlight.style.left = highlight.style.top = -HIGHLIGHT_OFFSET + 'px';
       highlight.style.right = highlight.style.bottom = -HIGHLIGHT_OFFSET + 'px';
       highlight.setAttribute('hidden', true);
       this.highlightElement = highlight;
       container.appendChild(this.highlightElement);
       return container;
     }
   });
   return InteractiveAnnotation;
 })();
 var TextAnnotation = (function TextAnnotationClosure() {
   function TextAnnotation(params) {
     InteractiveAnnotation.call(this, params);
     if (params.data) {
       return;
     }
     var dict = params.dict;
     var data = this.data;
     var content = dict.get('Contents');
     var title = dict.get('T');
     data.content = stringToPDFString(content || '');
     data.title = stringToPDFString(title || '');
     if (data.hasAppearance) {
       data.name = 'NoIcon';
     } else {
       data.name = dict.has('Name') ? dict.get('Name').name : 'Note';
     }
     if (dict.has('C')) {
       data.hasBgColor = true;
     }
   }
   var ANNOT_MIN_SIZE = 10;
   Util.inherit(TextAnnotation, InteractiveAnnotation, {
     getHtmlElement: function TextAnnotation_getHtmlElement(commonObjs) {
       assert(!isWorker, 'getHtmlElement() shall be called from main thread');
       var item = this.data;
       var rect = item.rect;
       // sanity check because of OOo-generated PDFs
       if ((rect[3] - rect[1]) < ANNOT_MIN_SIZE) {
         rect[3] = rect[1] + ANNOT_MIN_SIZE;
       }
       if ((rect[2] - rect[0]) < ANNOT_MIN_SIZE) {
         rect[2] = rect[0] + (rect[3] - rect[1]); // make it square
       }
       var container = this.initContainer();
       container.className = 'annotText';
       var image  = document.createElement('img');
       image.style.height = container.style.height;
       image.style.width = container.style.width;
       var iconName = item.name;
       image.src = PDFJS.imageResourcesPath + 'annotation-' +
         iconName.toLowerCase() + '.svg';
       image.alt = '[{{type}} Annotation]';
       image.dataset.l10nId = 'text_annotation_type';
       image.dataset.l10nArgs = JSON.stringify({type: iconName});
       var contentWrapper = document.createElement('div');
       contentWrapper.className = 'annotTextContentWrapper';
       contentWrapper.style.left = Math.floor(rect[2] - rect[0] + 5) + 'px';
       contentWrapper.style.top = '-10px';
       var content = document.createElement('div');
       content.className = 'annotTextContent';
       content.setAttribute('hidden', true);
       var i, ii;
       if (item.hasBgColor) {
         var color = item.color;
         var rgb = [];
         for (i = 0; i < 3; ++i) {
           // Enlighten the color (70%)
           var c = Math.round(color[i] * 255);
           rgb[i] = Math.round((255 - c) * 0.7) + c;
         }
         content.style.backgroundColor = Util.makeCssRgb(rgb);
       }
       var title = document.createElement('h1');
       var text = document.createElement('p');
       title.textContent = item.title;
       if (!item.content && !item.title) {
         content.setAttribute('hidden', true);
       } else {
         var e = document.createElement('span');
         var lines = item.content.split(/(?:\r\n?|\n)/);
         for (i = 0, ii = lines.length; i < ii; ++i) {
           var line = lines[i];
           e.appendChild(document.createTextNode(line));
           if (i < (ii - 1)) {
             e.appendChild(document.createElement('br'));
           }
         }
         text.appendChild(e);
         var pinned = false;
         var showAnnotation = function showAnnotation(pin) {
           if (pin) {
             pinned = true;
           }
           if (content.hasAttribute('hidden')) {
             container.style.zIndex += 1;
             content.removeAttribute('hidden');
           }
         };
         var hideAnnotation = function hideAnnotation(unpin) {
           if (unpin) {
             pinned = false;
           }
           if (!content.hasAttribute('hidden') && !pinned) {
             container.style.zIndex -= 1;
             content.setAttribute('hidden', true);
           }
         };
         var toggleAnnotation = function toggleAnnotation() {
           if (pinned) {
             hideAnnotation(true);
           } else {
             showAnnotation(true);
           }
         };
         image.addEventListener('click', function image_clickHandler() {
           toggleAnnotation();
         }, false);
         image.addEventListener('mouseover', function image_mouseOverHandler() {
           showAnnotation();
         }, false);
         image.addEventListener('mouseout', function image_mouseOutHandler() {
           hideAnnotation();
         }, false);
         content.addEventListener('click', function content_clickHandler() {
           hideAnnotation(true);
         }, false);
       }
       content.appendChild(title);
       content.appendChild(text);
       contentWrapper.appendChild(content);
       container.appendChild(image);
       container.appendChild(contentWrapper);
       return container;
     }
   });
   return TextAnnotation;
 })();
 var LinkAnnotation = (function LinkAnnotationClosure() {
   function LinkAnnotation(params) {
     InteractiveAnnotation.call(this, params);
     if (params.data) {
       return;
     }
     var dict = params.dict;
     var data = this.data;
     var action = dict.get('A');
     if (action) {
       var linkType = action.get('S').name;
       if (linkType === 'URI') {
         var url = action.get('URI');
         if (isName(url)) {
           // Some bad PDFs do not put parentheses around relative URLs.
           url = '/' + url.name;
         } else if (url) {
           url = addDefaultProtocolToUrl(url);
         }
         // TODO: pdf spec mentions urls can be relative to a Base
         // entry in the dictionary.
         if (!isValidUrl(url, false)) {
           url = '';
         }
         data.url = url;
       } else if (linkType === 'GoTo') {
         data.dest = action.get('D');
       } else if (linkType === 'GoToR') {
         var urlDict = action.get('F');
         if (isDict(urlDict)) {
           // We assume that the 'url' is a Filspec dictionary
           // and fetch the url without checking any further
           url = urlDict.get('F') || '';
         }
         // TODO: pdf reference says that GoToR
         // can also have 'NewWindow' attribute
         if (!isValidUrl(url, false)) {
           url = '';
         }
         data.url = url;
         data.dest = action.get('D');
       } else if (linkType === 'Named') {
         data.action = action.get('N').name;
       } else {
         warn('unrecognized link type: ' + linkType);
       }
     } else if (dict.has('Dest')) {
       // simple destination link
       var dest = dict.get('Dest');
       data.dest = isName(dest) ? dest.name : dest;
     }
   }
   // Lets URLs beginning with 'www.' default to using the 'http://' protocol.
   function addDefaultProtocolToUrl(url) {
     if (url && url.indexOf('www.') === 0) {
       return ('http://' + url);
     }
     return url;
   }
   Util.inherit(LinkAnnotation, InteractiveAnnotation, {
     hasOperatorList: function LinkAnnotation_hasOperatorList() {
       return false;
     },
     getHtmlElement: function LinkAnnotation_getHtmlElement(commonObjs) {
       var container = this.initContainer();
       container.className = 'annotLink';
       var item = this.data;
       container.style.borderColor = item.colorCssRgb;
       container.style.borderStyle = 'solid';
       var link = document.createElement('a');
       link.href = link.title = this.data.url || '';
       container.appendChild(link);
       return container;
     }
   });
   return LinkAnnotation;
 })();
 /**
  * The maximum allowed image size in total pixels e.g. width * height. Images
  * above this value will not be drawn. Use -1 for no limit.
  * @var {number}
  */
 PDFJS.maxImageSize = (PDFJS.maxImageSize === undefined ?
                       -1 : PDFJS.maxImageSize);
 /**
  * The url of where the predefined Adobe CMaps are located. Include trailing
  * slash.
  * @var {string}
  */
 PDFJS.cMapUrl = (PDFJS.cMapUrl === undefined ? null : PDFJS.cMapUrl);
 /**
  * Specifies if CMaps are binary packed.
  * @var {boolean}
  */
 PDFJS.cMapPacked = PDFJS.cMapPacked === undefined ? false : PDFJS.cMapPacked;
 /*
  * By default fonts are converted to OpenType fonts and loaded via font face
  * rules. If disabled, the font will be rendered using a built in font renderer
  * that constructs the glyphs with primitive path commands.
  * @var {boolean}
  */
 PDFJS.disableFontFace = (PDFJS.disableFontFace === undefined ?
                          false : PDFJS.disableFontFace);
 /**
  * Path for image resources, mainly for annotation icons. Include trailing
  * slash.
  * @var {string}
  */
 PDFJS.imageResourcesPath = (PDFJS.imageResourcesPath === undefined ?
                             '' : PDFJS.imageResourcesPath);
 /**
  * Disable the web worker and run all code on the main thread. This will happen
  * automatically if the browser doesn't support workers or sending typed arrays
  * to workers.
  * @var {boolean}
  */
 PDFJS.disableWorker = (PDFJS.disableWorker === undefined ?
                        false : PDFJS.disableWorker);
 /**
  * Path and filename of the worker file. Required when the worker is enabled in
  * development mode. If unspecified in the production build, the worker will be
  * loaded based on the location of the pdf.js file.
  * @var {string}
  */
 PDFJS.workerSrc = (PDFJS.workerSrc === undefined ? null : PDFJS.workerSrc);
 /**
  * Disable range request loading of PDF files. When enabled and if the server
  * supports partial content requests then the PDF will be fetched in chunks.
  * Enabled (false) by default.
  * @var {boolean}
  */
 PDFJS.disableRange = (PDFJS.disableRange === undefined ?
                       false : PDFJS.disableRange);
 /**
  * Disable pre-fetching of PDF file data. When range requests are enabled PDF.js
  * will automatically keep fetching more data even if it isn't needed to display
  * the current page. This default behavior can be disabled.
  * @var {boolean}
  */
 PDFJS.disableAutoFetch = (PDFJS.disableAutoFetch === undefined ?
                           false : PDFJS.disableAutoFetch);
 /**
  * Enables special hooks for debugging PDF.js.
  * @var {boolean}
  */
 PDFJS.pdfBug = (PDFJS.pdfBug === undefined ? false : PDFJS.pdfBug);
 /**
  * Enables transfer usage in postMessage for ArrayBuffers.
  * @var {boolean}
  */
 PDFJS.postMessageTransfers = (PDFJS.postMessageTransfers === undefined ?
                               true : PDFJS.postMessageTransfers);
 /**
  * Disables URL.createObjectURL usage.
  * @var {boolean}
  */
 PDFJS.disableCreateObjectURL = (PDFJS.disableCreateObjectURL === undefined ?
                                 false : PDFJS.disableCreateObjectURL);
 /**
  * Disables WebGL usage.
  * @var {boolean}
  */
 PDFJS.disableWebGL = (PDFJS.disableWebGL === undefined ?
                       true : PDFJS.disableWebGL);
 /**
  * Controls the logging level.
  * The constants from PDFJS.VERBOSITY_LEVELS should be used:
  * - errors
  * - warnings [default]
  * - infos
  * @var {number}
  */
 PDFJS.verbosity = (PDFJS.verbosity === undefined ?
                    PDFJS.VERBOSITY_LEVELS.warnings : PDFJS.verbosity);
 /**
  * Document initialization / loading parameters object.
  *
  * @typedef {Object} DocumentInitParameters
  * @property {string}     url   - The URL of the PDF.
  * @property {TypedArray} data  - A typed array with PDF data.
  * @property {Object}     httpHeaders - Basic authentication headers.
  * @property {boolean}    withCredentials - Indicates whether or not cross-site
  *   Access-Control requests should be made using credentials such as cookies
  *   or authorization headers. The default is false.
  * @property {string}     password - For decrypting password-protected PDFs.
  * @property {TypedArray} initialData - A typed array with the first portion or
  *   all of the pdf data. Used by the extension since some data is already
  *   loaded before the switch to range requests.
  */
 /**
  * This is the main entry point for loading a PDF and interacting with it.
  * NOTE: If a URL is used to fetch the PDF data a standard XMLHttpRequest(XHR)
  * is used, which means it must follow the same origin rules that any XHR does
  * e.g. No cross domain requests without CORS.
  *
  * @param {string|TypedArray|DocumentInitParameters} source Can be a url to
  * where a PDF is located, a typed array (Uint8Array) already populated with
  * data or parameter object.
  *
  * @param {Object} pdfDataRangeTransport is optional. It is used if you want
  * to manually serve range requests for data in the PDF. See viewer.js for
  * an example of pdfDataRangeTransport's interface.
  *
  * @param {function} passwordCallback is optional. It is used to request a
  * password if wrong or no password was provided. The callback receives two
  * parameters: function that needs to be called with new password and reason
  * (see {PasswordResponses}).
  *
  * @return {Promise} A promise that is resolved with {@link PDFDocumentProxy}
  *   object.
  */
 PDFJS.getDocument = function getDocument(source,
                                          pdfDataRangeTransport,
                                          passwordCallback,
                                          progressCallback) {
   var workerInitializedPromise, workerReadyPromise, transport;
   if (typeof source === 'string') {
     source = { url: source };
   } else if (isArrayBuffer(source)) {
     source = { data: source };
   } else if (typeof source !== 'object') {
     error('Invalid parameter in getDocument, need either Uint8Array, ' +
           'string or a parameter object');
   }
   if (!source.url && !source.data) {
     error('Invalid parameter array, need either .data or .url');
   }
   // copy/use all keys as is except 'url' -- full path is required
   var params = {};
   for (var key in source) {
     if (key === 'url' && typeof window !== 'undefined') {
       params[key] = combineUrl(window.location.href, source[key]);
       continue;
     }
     params[key] = source[key];
   }
   workerInitializedPromise = new PDFJS.LegacyPromise();
   workerReadyPromise = new PDFJS.LegacyPromise();
   transport = new WorkerTransport(workerInitializedPromise, workerReadyPromise,
                                   pdfDataRangeTransport, progressCallback);
   workerInitializedPromise.then(function transportInitialized() {
     transport.passwordCallback = passwordCallback;
     transport.fetchDocument(params);
   });
   return workerReadyPromise;
 };
 /**
  * Proxy to a PDFDocument in the worker thread. Also, contains commonly used
  * properties that can be read synchronously.
  * @class
  */
 var PDFDocumentProxy = (function PDFDocumentProxyClosure() {
   function PDFDocumentProxy(pdfInfo, transport) {
     this.pdfInfo = pdfInfo;
     this.transport = transport;
   }
   PDFDocumentProxy.prototype = /** @lends PDFDocumentProxy.prototype */ {
     /**
      * @return {number} Total number of pages the PDF contains.
      */
     get numPages() {
       return this.pdfInfo.numPages;
     },
     /**
      * @return {string} A unique ID to identify a PDF. Not guaranteed to be
      * unique.
      */
     get fingerprint() {
       return this.pdfInfo.fingerprint;
     },
     /**
      * @param {number} pageNumber The page number to get. The first page is 1.
      * @return {Promise} A promise that is resolved with a {@link PDFPageProxy}
      * object.
      */
     getPage: function PDFDocumentProxy_getPage(pageNumber) {
       return this.transport.getPage(pageNumber);
     },
     /**
      * @param {{num: number, gen: number}} ref The page reference. Must have
      *   the 'num' and 'gen' properties.
      * @return {Promise} A promise that is resolved with the page index that is
      * associated with the reference.
      */
     getPageIndex: function PDFDocumentProxy_getPageIndex(ref) {
       return this.transport.getPageIndex(ref);
     },
     /**
      * @return {Promise} A promise that is resolved with a lookup table for
      * mapping named destinations to reference numbers.
      */
     getDestinations: function PDFDocumentProxy_getDestinations() {
       return this.transport.getDestinations();
     },
     /**
      * @return {Promise} A promise that is resolved with a lookup table for
      * mapping named attachments to their content.
      */
     getAttachments: function PDFDocumentProxy_getAttachments() {
       return this.transport.getAttachments();
     },
     /**
      * @return {Promise} A promise that is resolved with an array of all the
      * JavaScript strings in the name tree.
      */
     getJavaScript: function PDFDocumentProxy_getJavaScript() {
       var promise = new PDFJS.LegacyPromise();
       var js = this.pdfInfo.javaScript;
       promise.resolve(js);
       return promise;
     },
     /**
      * @return {Promise} A promise that is resolved with an {Array} that is a
      * tree outline (if it has one) of the PDF. The tree is in the format of:
      * [
      *  {
      *   title: string,
      *   bold: boolean,
      *   italic: boolean,
      *   color: rgb array,
      *   dest: dest obj,
      *   items: array of more items like this
      *  },
      *  ...
      * ].
      */
     getOutline: function PDFDocumentProxy_getOutline() {
       var promise = new PDFJS.LegacyPromise();
       var outline = this.pdfInfo.outline;
       promise.resolve(outline);
       return promise;
     },
     /**
      * @return {Promise} A promise that is resolved with an {Object} that has
      * info and metadata properties.  Info is an {Object} filled with anything
      * available in the information dictionary and similarly metadata is a
      * {Metadata} object with information from the metadata section of the PDF.
      */
     getMetadata: function PDFDocumentProxy_getMetadata() {
       var promise = new PDFJS.LegacyPromise();
       var info = this.pdfInfo.info;
       var metadata = this.pdfInfo.metadata;
       promise.resolve({
         info: info,
         metadata: (metadata ? new PDFJS.Metadata(metadata) : null)
       });
       return promise;
     },
     /**
      * @return {Promise} A promise that is resolved with a TypedArray that has
      * the raw data from the PDF.
      */
     getData: function PDFDocumentProxy_getData() {
       var promise = new PDFJS.LegacyPromise();
       this.transport.getData(promise);
       return promise;
     },
     /**
      * @return {Promise} A promise that is resolved when the document's data
      * is loaded. It is resolved with an {Object} that contains the length
      * property that indicates size of the PDF data in bytes.
      */
     getDownloadInfo: function PDFDocumentProxy_getDownloadInfo() {
       return this.transport.downloadInfoPromise;
     },
     /**
      * Cleans up resources allocated by the document, e.g. created @font-face.
      */
     cleanup: function PDFDocumentProxy_cleanup() {
       this.transport.startCleanup();
     },
     /**
      * Destroys current document instance and terminates worker.
      */
     destroy: function PDFDocumentProxy_destroy() {
       this.transport.destroy();
     }
   };
   return PDFDocumentProxy;
 })();
 /**
  * Page text content.
  *
  * @typedef {Object} TextContent
  * @property {array} items - array of {@link TextItem}
  * @property {Object} styles - {@link TextStyles} objects, indexed by font
  *                    name.
  */
 /**
  * Page text content part.
  *
  * @typedef {Object} TextItem
  * @property {string} str - text content.
  * @property {string} dir - text direction: 'ttb', 'ltr' or 'rtl'.
  * @property {array} transform - transformation matrix.
  * @property {number} width - width in device space.
  * @property {number} height - height in device space.
  * @property {string} fontName - font name used by pdf.js for converted font.
  */
 /**
  * Text style.
  *
  * @typedef {Object} TextStyle
  * @property {number} ascent - font ascent.
  * @property {number} descent - font descent.
  * @property {boolean} vertical - text is in vertical mode.
  * @property {string} fontFamily - possible font family
  */
 /**
  * Page render parameters.
  *
  * @typedef {Object} RenderParameters
  * @property {Object} canvasContext - A 2D context of a DOM Canvas object.
  * @property {PageViewport} viewport - Rendering viewport obtained by
  *                          calling of PDFPage.getViewport method.
  * @property {string} intent - Rendering intent, can be 'display' or 'print'
  *                    (default value is 'display').
  * @property {Object} imageLayer - (optional) An object that has beginLayout,
  *                    endLayout and appendImage functions.
  * @property {function} continueCallback - (optional) A function that will be
  *                      called each time the rendering is paused.  To continue
  *                      rendering call the function that is the first argument
  *                      to the callback.
  */
 /**
  * Proxy to a PDFPage in the worker thread.
  * @class
  */
 var PDFPageProxy = (function PDFPageProxyClosure() {
   function PDFPageProxy(pageInfo, transport) {
     this.pageInfo = pageInfo;
     this.transport = transport;
     this.stats = new StatTimer();
     this.stats.enabled = !!globalScope.PDFJS.enableStats;
     this.commonObjs = transport.commonObjs;
     this.objs = new PDFObjects();
     this.cleanupAfterRender = false;
     this.pendingDestroy = false;
     this.intentStates = {};
   }
   PDFPageProxy.prototype = /** @lends PDFPageProxy.prototype */ {
     /**
      * @return {number} Page number of the page. First page is 1.
      */
     get pageNumber() {
       return this.pageInfo.pageIndex + 1;
     },
     /**
      * @return {number} The number of degrees the page is rotated clockwise.
      */
     get rotate() {
       return this.pageInfo.rotate;
     },
     /**
      * @return {Object} The reference that points to this page. It has 'num' and
      * 'gen' properties.
      */
     get ref() {
       return this.pageInfo.ref;
     },
     /**
      * @return {Array} An array of the visible portion of the PDF page in the
      * user space units - [x1, y1, x2, y2].
      */
     get view() {
       return this.pageInfo.view;
     },
     /**
      * @param {number} scale The desired scale of the viewport.
      * @param {number} rotate Degrees to rotate the viewport. If omitted this
      * defaults to the page rotation.
      * @return {PageViewport} Contains 'width' and 'height' properties along
      * with transforms required for rendering.
      */
     getViewport: function PDFPageProxy_getViewport(scale, rotate) {
       if (arguments.length < 2) {
         rotate = this.rotate;
       }
       return new PDFJS.PageViewport(this.view, scale, rotate, 0, 0);
     },
     /**
      * @return {Promise} A promise that is resolved with an {Array} of the
      * annotation objects.
      */
     getAnnotations: function PDFPageProxy_getAnnotations() {
       if (this.annotationsPromise) {
         return this.annotationsPromise;
       }
       var promise = new PDFJS.LegacyPromise();
       this.annotationsPromise = promise;
       this.transport.getAnnotations(this.pageInfo.pageIndex);
       return promise;
     },
     /**
      * Begins the process of rendering a page to the desired context.
      * @param {RenderParameters} params Page render parameters.
      * @return {RenderTask} An object that contains the promise, which
      *                      is resolved when the page finishes rendering.
      */
     render: function PDFPageProxy_render(params) {
       var stats = this.stats;
       stats.time('Overall');
       // If there was a pending destroy cancel it so no cleanup happens during
       // this call to render.
       this.pendingDestroy = false;
       var renderingIntent = ('intent' in params ?
         (params.intent == 'print' ? 'print' : 'display') : 'display');
       if (!this.intentStates[renderingIntent]) {
         this.intentStates[renderingIntent] = {};
       }
       var intentState = this.intentStates[renderingIntent];
       // If there is no displayReadyPromise yet, then the operatorList was never
       // requested before. Make the request and create the promise.
       if (!intentState.displayReadyPromise) {
         intentState.receivingOperatorList = true;
         intentState.displayReadyPromise = new LegacyPromise();
         intentState.operatorList = {
           fnArray: [],
           argsArray: [],
           lastChunk: false
         };
         this.stats.time('Page Request');
         this.transport.messageHandler.send('RenderPageRequest', {
           pageIndex: this.pageNumber - 1,
           intent: renderingIntent
         });
       }
       var internalRenderTask = new InternalRenderTask(complete, params,
                                                       this.objs,
                                                       this.commonObjs,
                                                       intentState.operatorList,
                                                       this.pageNumber);
       if (!intentState.renderTasks) {
         intentState.renderTasks = [];
       }
       intentState.renderTasks.push(internalRenderTask);
       var renderTask = new RenderTask(internalRenderTask);
       var self = this;
       intentState.displayReadyPromise.then(
         function pageDisplayReadyPromise(transparency) {
           if (self.pendingDestroy) {
             complete();
             return;
           }
           stats.time('Rendering');
           internalRenderTask.initalizeGraphics(transparency);
           internalRenderTask.operatorListChanged();
         },
         function pageDisplayReadPromiseError(reason) {
           complete(reason);
         }
       );
       function complete(error) {
         var i = intentState.renderTasks.indexOf(internalRenderTask);
         if (i >= 0) {
           intentState.renderTasks.splice(i, 1);
         }
         if (self.cleanupAfterRender) {
           self.pendingDestroy = true;
         }
         self._tryDestroy();
         if (error) {
           renderTask.promise.reject(error);
         } else {
           renderTask.promise.resolve();
         }
         stats.timeEnd('Rendering');
         stats.timeEnd('Overall');
       }
       return renderTask;
     },
     /**
      * @return {Promise} That is resolved a {@link TextContent}
      * object that represent the page text content.
      */
     getTextContent: function PDFPageProxy_getTextContent() {
       var promise = new PDFJS.LegacyPromise();
       this.transport.messageHandler.send('GetTextContent', {
           pageIndex: this.pageNumber - 1
         },
         function textContentCallback(textContent) {
           promise.resolve(textContent);
         }
       );
       return promise;
     },
     /**
      * Destroys resources allocated by the page.
      */
     destroy: function PDFPageProxy_destroy() {
       this.pendingDestroy = true;
       this._tryDestroy();
     },
     /**
      * For internal use only. Attempts to clean up if rendering is in a state
      * where that's possible.
      * @ignore
      */
     _tryDestroy: function PDFPageProxy__destroy() {
       if (!this.pendingDestroy ||
           Object.keys(this.intentStates).some(function(intent) {
             var intentState = this.intentStates[intent];
             return (intentState.renderTasks.length !== 0 ||
                     intentState.receivingOperatorList);
           }, this)) {
         return;
       }
       Object.keys(this.intentStates).forEach(function(intent) {
         delete this.intentStates[intent];
       }, this);
       this.objs.clear();
       this.pendingDestroy = false;
     },
     /**
      * For internal use only.
      * @ignore
      */
     _startRenderPage: function PDFPageProxy_startRenderPage(transparency,
                                                             intent) {
       var intentState = this.intentStates[intent];
       intentState.displayReadyPromise.resolve(transparency);
     },
     /**
      * For internal use only.
      * @ignore
      */
     _renderPageChunk: function PDFPageProxy_renderPageChunk(operatorListChunk,
                                                             intent) {
       var intentState = this.intentStates[intent];
       var i, ii;
       // Add the new chunk to the current operator list.
       for (i = 0, ii = operatorListChunk.length; i < ii; i++) {
         intentState.operatorList.fnArray.push(operatorListChunk.fnArray[i]);
         intentState.operatorList.argsArray.push(
           operatorListChunk.argsArray[i]);
       }
       intentState.operatorList.lastChunk = operatorListChunk.lastChunk;
       // Notify all the rendering tasks there are more operators to be consumed.
       for (i = 0; i < intentState.renderTasks.length; i++) {
         intentState.renderTasks[i].operatorListChanged();
       }
       if (operatorListChunk.lastChunk) {
         intentState.receivingOperatorList = false;
         this._tryDestroy();
       }
     }
   };
   return PDFPageProxy;
 })();
 /**
  * For internal use only.
  * @ignore
  */
 var WorkerTransport = (function WorkerTransportClosure() {
   function WorkerTransport(workerInitializedPromise, workerReadyPromise,
                            pdfDataRangeTransport, progressCallback) {
     this.pdfDataRangeTransport = pdfDataRangeTransport;
     this.workerReadyPromise = workerReadyPromise;
     this.progressCallback = progressCallback;
     this.commonObjs = new PDFObjects();
     this.pageCache = [];
     this.pagePromises = [];
     this.downloadInfoPromise = new PDFJS.LegacyPromise();
     this.passwordCallback = null;
     // If worker support isn't disabled explicit and the browser has worker
     // support, create a new web worker and test if it/the browser fullfills
     // all requirements to run parts of pdf.js in a web worker.
     // Right now, the requirement is, that an Uint8Array is still an Uint8Array
     // as it arrives on the worker. Chrome added this with version 15.
     if (!globalScope.PDFJS.disableWorker && typeof Worker !== 'undefined') {
       var workerSrc = PDFJS.workerSrc;
       if (!workerSrc) {
         error('No PDFJS.workerSrc specified');
       }
       try {
         // Some versions of FF can't create a worker on localhost, see:
         // https://bugzilla.mozilla.org/show_bug.cgi?id=683280
         var worker = new Worker(workerSrc);
         var messageHandler = new MessageHandler('main', worker);
         this.messageHandler = messageHandler;
         messageHandler.on('test', function transportTest(data) {
           var supportTypedArray = data && data.supportTypedArray;
           if (supportTypedArray) {
             this.worker = worker;
             if (!data.supportTransfers) {
               PDFJS.postMessageTransfers = false;
             }
             this.setupMessageHandler(messageHandler);
             workerInitializedPromise.resolve();
           } else {
             globalScope.PDFJS.disableWorker = true;
             this.loadFakeWorkerFiles().then(function() {
               this.setupFakeWorker();
               workerInitializedPromise.resolve();
             }.bind(this));
           }
         }.bind(this));
         var testObj = new Uint8Array([PDFJS.postMessageTransfers ? 255 : 0]);
         // Some versions of Opera throw a DATA_CLONE_ERR on serializing the
         // typed array. Also, checking if we can use transfers.
         try {
           messageHandler.send('test', testObj, null, [testObj.buffer]);
         } catch (ex) {
           info('Cannot use postMessage transfers');
           testObj[0] = 0;
           messageHandler.send('test', testObj);
         }
         return;
       } catch (e) {
         info('The worker has been disabled.');
       }
     }
     // Either workers are disabled, not supported or have thrown an exception.
     // Thus, we fallback to a faked worker.
     globalScope.PDFJS.disableWorker = true;
     this.loadFakeWorkerFiles().then(function() {
       this.setupFakeWorker();
       workerInitializedPromise.resolve();
     }.bind(this));
   }
   WorkerTransport.prototype = {
     destroy: function WorkerTransport_destroy() {
       this.pageCache = [];
       this.pagePromises = [];
       var self = this;
       this.messageHandler.send('Terminate', null, function () {
         FontLoader.clear();
         if (self.worker) {
           self.worker.terminate();
         }
       });
     },
     loadFakeWorkerFiles: function WorkerTransport_loadFakeWorkerFiles() {
       if (!PDFJS.fakeWorkerFilesLoadedPromise) {
         PDFJS.fakeWorkerFilesLoadedPromise = new LegacyPromise();
         // In the developer build load worker_loader which in turn loads all the
         // other files and resolves the promise. In production only the
         // pdf.worker.js file is needed.
         Util.loadScript(PDFJS.workerSrc, function() {
           PDFJS.fakeWorkerFilesLoadedPromise.resolve();
         });
       }
       return PDFJS.fakeWorkerFilesLoadedPromise;
     },
     setupFakeWorker: function WorkerTransport_setupFakeWorker() {
       warn('Setting up fake worker.');
       // If we don't use a worker, just post/sendMessage to the main thread.
       var fakeWorker = {
         postMessage: function WorkerTransport_postMessage(obj) {
           fakeWorker.onmessage({data: obj});
         },
         terminate: function WorkerTransport_terminate() {}
       };
       var messageHandler = new MessageHandler('main', fakeWorker);
       this.setupMessageHandler(messageHandler);
       // If the main thread is our worker, setup the handling for the messages
       // the main thread sends to it self.
       PDFJS.WorkerMessageHandler.setup(messageHandler);
     },
     setupMessageHandler:
       function WorkerTransport_setupMessageHandler(messageHandler) {
       this.messageHandler = messageHandler;
       function updatePassword(password) {
         messageHandler.send('UpdatePassword', password);
       }
       var pdfDataRangeTransport = this.pdfDataRangeTransport;
       if (pdfDataRangeTransport) {
         pdfDataRangeTransport.addRangeListener(function(begin, chunk) {
           messageHandler.send('OnDataRange', {
             begin: begin,
             chunk: chunk
           });
         });
         pdfDataRangeTransport.addProgressListener(function(loaded) {
           messageHandler.send('OnDataProgress', {
             loaded: loaded
           });
         });
         messageHandler.on('RequestDataRange',
           function transportDataRange(data) {
             pdfDataRangeTransport.requestDataRange(data.begin, data.end);
           }, this);
       }
       messageHandler.on('GetDoc', function transportDoc(data) {
         var pdfInfo = data.pdfInfo;
         this.numPages = data.pdfInfo.numPages;
         var pdfDocument = new PDFDocumentProxy(pdfInfo, this);
         this.pdfDocument = pdfDocument;
         this.workerReadyPromise.resolve(pdfDocument);
       }, this);
       messageHandler.on('NeedPassword', function transportPassword(data) {
         if (this.passwordCallback) {
           return this.passwordCallback(updatePassword,
                                        PasswordResponses.NEED_PASSWORD);
         }
         this.workerReadyPromise.reject(data.exception.message, data.exception);
       }, this);
       messageHandler.on('IncorrectPassword', function transportBadPass(data) {
         if (this.passwordCallback) {
           return this.passwordCallback(updatePassword,
                                        PasswordResponses.INCORRECT_PASSWORD);
         }
         this.workerReadyPromise.reject(data.exception.message, data.exception);
       }, this);
       messageHandler.on('InvalidPDF', function transportInvalidPDF(data) {
         this.workerReadyPromise.reject(data.exception.name, data.exception);
       }, this);
       messageHandler.on('MissingPDF', function transportMissingPDF(data) {
         this.workerReadyPromise.reject(data.exception.message, data.exception);
       }, this);
       messageHandler.on('UnknownError', function transportUnknownError(data) {
         this.workerReadyPromise.reject(data.exception.message, data.exception);
       }, this);
       messageHandler.on('DataLoaded', function transportPage(data) {
         this.downloadInfoPromise.resolve(data);
       }, this);
       messageHandler.on('GetPage', function transportPage(data) {
         var pageInfo = data.pageInfo;
         var page = new PDFPageProxy(pageInfo, this);
         this.pageCache[pageInfo.pageIndex] = page;
         var promise = this.pagePromises[pageInfo.pageIndex];
         promise.resolve(page);
       }, this);
       messageHandler.on('GetAnnotations', function transportAnnotations(data) {
         var annotations = data.annotations;
         var promise = this.pageCache[data.pageIndex].annotationsPromise;
         promise.resolve(annotations);
       }, this);
       messageHandler.on('StartRenderPage', function transportRender(data) {
         var page = this.pageCache[data.pageIndex];
         page.stats.timeEnd('Page Request');
         page._startRenderPage(data.transparency, data.intent);
       }, this);
       messageHandler.on('RenderPageChunk', function transportRender(data) {
         var page = this.pageCache[data.pageIndex];
         page._renderPageChunk(data.operatorList, data.intent);
       }, this);
       messageHandler.on('commonobj', function transportObj(data) {
         var id = data[0];
         var type = data[1];
         if (this.commonObjs.hasData(id)) {
           return;
         }
         switch (type) {
           case 'Font':
             var exportedData = data[2];
             var font;
             if ('error' in exportedData) {
               var error = exportedData.error;
               warn('Error during font loading: ' + error);
               this.commonObjs.resolve(id, error);
               break;
             } else {
               font = new FontFace(exportedData);
             }
             FontLoader.bind(
               [font],
               function fontReady(fontObjs) {
                 this.commonObjs.resolve(id, font);
               }.bind(this)
             );
             break;
           case 'FontPath':
             this.commonObjs.resolve(id, data[2]);
             break;
           default:
             error('Got unknown common object type ' + type);
         }
       }, this);
       messageHandler.on('obj', function transportObj(data) {
         var id = data[0];
         var pageIndex = data[1];
         var type = data[2];
         var pageProxy = this.pageCache[pageIndex];
         var imageData;
         if (pageProxy.objs.hasData(id)) {
           return;
         }
         switch (type) {
           case 'JpegStream':
             imageData = data[3];
             loadJpegStream(id, imageData, pageProxy.objs);
             break;
           case 'Image':
             imageData = data[3];
             pageProxy.objs.resolve(id, imageData);
             // heuristics that will allow not to store large data
             var MAX_IMAGE_SIZE_TO_STORE = 8000000;
             if (imageData && 'data' in imageData &&
                 imageData.data.length > MAX_IMAGE_SIZE_TO_STORE) {
               pageProxy.cleanupAfterRender = true;
             }
             break;
           default:
             error('Got unknown object type ' + type);
         }
       }, this);
       messageHandler.on('DocProgress', function transportDocProgress(data) {
         if (this.progressCallback) {
           this.progressCallback({
             loaded: data.loaded,
             total: data.total
           });
         }
       }, this);
       messageHandler.on('DocError', function transportDocError(data) {
         this.workerReadyPromise.reject(data);
       }, this);
       messageHandler.on('PageError', function transportError(data, intent) {
         var page = this.pageCache[data.pageNum - 1];
         var intentState = page.intentStates[intent];
         if (intentState.displayReadyPromise) {
           intentState.displayReadyPromise.reject(data.error);
         } else {
           error(data.error);
         }
       }, this);
       messageHandler.on('JpegDecode', function(data, deferred) {
         var imageUrl = data[0];
         var components = data[1];
         if (components != 3 && components != 1) {
           error('Only 3 component or 1 component can be returned');
         }
         var img = new Image();
         img.onload = (function messageHandler_onloadClosure() {
           var width = img.width;
           var height = img.height;
           var size = width * height;
           var rgbaLength = size * 4;
           var buf = new Uint8Array(size * components);
           var tmpCanvas = createScratchCanvas(width, height);
           var tmpCtx = tmpCanvas.getContext('2d');
           tmpCtx.drawImage(img, 0, 0);
           var data = tmpCtx.getImageData(0, 0, width, height).data;
           var i, j;
           if (components == 3) {
             for (i = 0, j = 0; i < rgbaLength; i += 4, j += 3) {
               buf[j] = data[i];
               buf[j + 1] = data[i + 1];
               buf[j + 2] = data[i + 2];
             }
           } else if (components == 1) {
             for (i = 0, j = 0; i < rgbaLength; i += 4, j++) {
               buf[j] = data[i];
             }
           }
           deferred.resolve({ data: buf, width: width, height: height});
         }).bind(this);
         img.src = imageUrl;
       });
     },
     fetchDocument: function WorkerTransport_fetchDocument(source) {
       source.disableAutoFetch = PDFJS.disableAutoFetch;
       source.chunkedViewerLoading = !!this.pdfDataRangeTransport;
       this.messageHandler.send('GetDocRequest', {
         source: source,
         disableRange: PDFJS.disableRange,
         maxImageSize: PDFJS.maxImageSize,
         cMapUrl: PDFJS.cMapUrl,
         cMapPacked: PDFJS.cMapPacked,
         disableFontFace: PDFJS.disableFontFace,
         disableCreateObjectURL: PDFJS.disableCreateObjectURL,
         verbosity: PDFJS.verbosity
       });
     },
     getData: function WorkerTransport_getData(promise) {
       this.messageHandler.send('GetData', null, function(data) {
         promise.resolve(data);
       });
     },
     getPage: function WorkerTransport_getPage(pageNumber, promise) {
       if (pageNumber <= 0 || pageNumber > this.numPages ||
           (pageNumber|0) !== pageNumber) {
         var pagePromise = new PDFJS.LegacyPromise();
         pagePromise.reject(new Error('Invalid page request'));
         return pagePromise;
       }
       var pageIndex = pageNumber - 1;
       if (pageIndex in this.pagePromises) {
         return this.pagePromises[pageIndex];
       }
       promise = new PDFJS.LegacyPromise();
       this.pagePromises[pageIndex] = promise;
       this.messageHandler.send('GetPageRequest', { pageIndex: pageIndex });
       return promise;
     },
     getPageIndex: function WorkerTransport_getPageIndexByRef(ref) {
       var promise = new PDFJS.LegacyPromise();
       this.messageHandler.send('GetPageIndex', { ref: ref },
         function (pageIndex) {
           promise.resolve(pageIndex);
         }
       );
       return promise;
     },
     getAnnotations: function WorkerTransport_getAnnotations(pageIndex) {
       this.messageHandler.send('GetAnnotationsRequest',
         { pageIndex: pageIndex });
     },
     getDestinations: function WorkerTransport_getDestinations() {
       var promise = new PDFJS.LegacyPromise();
       this.messageHandler.send('GetDestinations', null,
         function transportDestinations(destinations) {
           promise.resolve(destinations);
         }
       );
       return promise;
     },
     getAttachments: function WorkerTransport_getAttachments() {
       var promise = new PDFJS.LegacyPromise();
       this.messageHandler.send('GetAttachments', null,
         function transportAttachments(attachments) {
           promise.resolve(attachments);
         }
       );
       return promise;
     },
     startCleanup: function WorkerTransport_startCleanup() {
       this.messageHandler.send('Cleanup', null,
         function endCleanup() {
           for (var i = 0, ii = this.pageCache.length; i < ii; i++) {
             var page = this.pageCache[i];
             if (page) {
               page.destroy();
             }
           }
           this.commonObjs.clear();
           FontLoader.clear();
         }.bind(this)
       );
     }
   };
   return WorkerTransport;
 })();
 /**
  * A PDF document and page is built of many objects. E.g. there are objects
  * for fonts, images, rendering code and such. These objects might get processed
  * inside of a worker. The `PDFObjects` implements some basic functions to
  * manage these objects.
  * @ignore
  */
 var PDFObjects = (function PDFObjectsClosure() {
   function PDFObjects() {
     this.objs = {};
   }
   PDFObjects.prototype = {
     /**
      * Internal function.
      * Ensures there is an object defined for `objId`.
      */
     ensureObj: function PDFObjects_ensureObj(objId) {
       if (this.objs[objId]) {
         return this.objs[objId];
       }
       var obj = {
         promise: new LegacyPromise(),
         data: null,
         resolved: false
       };
       this.objs[objId] = obj;
       return obj;
     },
     /**
      * If called *without* callback, this returns the data of `objId` but the
      * object needs to be resolved. If it isn't, this function throws.
      *
      * If called *with* a callback, the callback is called with the data of the
      * object once the object is resolved. That means, if you call this
      * function and the object is already resolved, the callback gets called
      * right away.
      */
     get: function PDFObjects_get(objId, callback) {
       // If there is a callback, then the get can be async and the object is
       // not required to be resolved right now
       if (callback) {
         this.ensureObj(objId).promise.then(callback);
         return null;
       }
       // If there isn't a callback, the user expects to get the resolved data
       // directly.
       var obj = this.objs[objId];
       // If there isn't an object yet or the object isn't resolved, then the
       // data isn't ready yet!
       if (!obj || !obj.resolved) {
         error('Requesting object that isn\'t resolved yet ' + objId);
       }
       return obj.data;
     },
     /**
      * Resolves the object `objId` with optional `data`.
      */
     resolve: function PDFObjects_resolve(objId, data) {
       var obj = this.ensureObj(objId);
       obj.resolved = true;
       obj.data = data;
       obj.promise.resolve(data);
     },
     isResolved: function PDFObjects_isResolved(objId) {
       var objs = this.objs;
       if (!objs[objId]) {
         return false;
       } else {
         return objs[objId].resolved;
       }
     },
     hasData: function PDFObjects_hasData(objId) {
       return this.isResolved(objId);
     },
     /**
      * Returns the data of `objId` if object exists, null otherwise.
      */
     getData: function PDFObjects_getData(objId) {
       var objs = this.objs;
       if (!objs[objId] || !objs[objId].resolved) {
         return null;
       } else {
         return objs[objId].data;
       }
     },
     clear: function PDFObjects_clear() {
       this.objs = {};
     }
   };
   return PDFObjects;
 })();
 /**
  * Allows controlling of the rendering tasks.
  * @class
  */
 var RenderTask = (function RenderTaskClosure() {
   function RenderTask(internalRenderTask) {
     this.internalRenderTask = internalRenderTask;
     /**
      * Promise for rendering task completion.
      * @type {Promise}
      */
     this.promise = new PDFJS.LegacyPromise();
   }
   RenderTask.prototype = /** @lends RenderTask.prototype */ {
     /**
      * Cancels the rendering task. If the task is currently rendering it will
      * not be cancelled until graphics pauses with a timeout. The promise that
      * this object extends will resolved when cancelled.
      */
     cancel: function RenderTask_cancel() {
       this.internalRenderTask.cancel();
       this.promise.reject(new Error('Rendering is cancelled'));
     },
     /**
      * Registers callback to indicate the rendering task completion.
      *
      * @param {function} onFulfilled The callback for the rendering completion.
      * @param {function} onRejected The callback for the rendering failure.
      * @return {Promise} A promise that is resolved after the onFulfilled or
      *                   onRejected callback.
      */
     then: function RenderTask_then(onFulfilled, onRejected) {
       return this.promise.then(onFulfilled, onRejected);
     }
   };
   return RenderTask;
 })();
 /**
  * For internal use only.
  * @ignore
  */
 var InternalRenderTask = (function InternalRenderTaskClosure() {
   function InternalRenderTask(callback, params, objs, commonObjs, operatorList,
                               pageNumber) {
     this.callback = callback;
     this.params = params;
     this.objs = objs;
     this.commonObjs = commonObjs;
     this.operatorListIdx = null;
     this.operatorList = operatorList;
     this.pageNumber = pageNumber;
     this.running = false;
     this.graphicsReadyCallback = null;
     this.graphicsReady = false;
     this.cancelled = false;
   }
   InternalRenderTask.prototype = {
     initalizeGraphics:
         function InternalRenderTask_initalizeGraphics(transparency) {
       if (this.cancelled) {
         return;
       }
       if (PDFJS.pdfBug && 'StepperManager' in globalScope &&
           globalScope.StepperManager.enabled) {
         this.stepper = globalScope.StepperManager.create(this.pageNumber - 1);
         this.stepper.init(this.operatorList);
         this.stepper.nextBreakPoint = this.stepper.getNextBreakPoint();
       }
       var params = this.params;
       this.gfx = new CanvasGraphics(params.canvasContext, this.commonObjs,
                                     this.objs, params.imageLayer);
       this.gfx.beginDrawing(params.viewport, transparency);
       this.operatorListIdx = 0;
       this.graphicsReady = true;
       if (this.graphicsReadyCallback) {
         this.graphicsReadyCallback();
       }
     },
     cancel: function InternalRenderTask_cancel() {
       this.running = false;
       this.cancelled = true;
       this.callback('cancelled');
     },
     operatorListChanged: function InternalRenderTask_operatorListChanged() {
       if (!this.graphicsReady) {
         if (!this.graphicsReadyCallback) {
           this.graphicsReadyCallback = this._continue.bind(this);
         }
         return;
       }
       if (this.stepper) {
         this.stepper.updateOperatorList(this.operatorList);
       }
       if (this.running) {
         return;
       }
       this._continue();
     },
     _continue: function InternalRenderTask__continue() {
       this.running = true;
       if (this.cancelled) {
         return;
       }
       if (this.params.continueCallback) {
         this.params.continueCallback(this._next.bind(this));
       } else {
         this._next();
       }
     },
     _next: function InternalRenderTask__next() {
       if (this.cancelled) {
         return;
       }
       this.operatorListIdx = this.gfx.executeOperatorList(this.operatorList,
                                         this.operatorListIdx,
                                         this._continue.bind(this),
                                         this.stepper);
       if (this.operatorListIdx === this.operatorList.argsArray.length) {
         this.running = false;
         if (this.operatorList.lastChunk) {
           this.gfx.endDrawing();
           this.callback();
         }
       }
     }
   };
   return InternalRenderTask;
 })();
 var Metadata = PDFJS.Metadata = (function MetadataClosure() {
   function fixMetadata(meta) {
     return meta.replace(/>\\376\\377([^<]+)/g, function(all, codes) {
       var bytes = codes.replace(/\\([0-3])([0-7])([0-7])/g,
                                 function(code, d1, d2, d3) {
         return String.fromCharCode(d1 * 64 + d2 * 8 + d3 * 1);
       });
       var chars = '';
       for (var i = 0; i < bytes.length; i += 2) {
         var code = bytes.charCodeAt(i) * 256 + bytes.charCodeAt(i + 1);
         chars += code >= 32 && code < 127 && code != 60 && code != 62 &&
           code != 38 && false ? String.fromCharCode(code) :
           '&#x' + (0x10000 + code).toString(16).substring(1) + ';';
       }
       return '>' + chars;
     });
   }
   function Metadata(meta) {
     if (typeof meta === 'string') {
       // Ghostscript produces invalid metadata
       meta = fixMetadata(meta);
       var parser = new DOMParser();
       meta = parser.parseFromString(meta, 'application/xml');
     } else if (!(meta instanceof Document)) {
       error('Metadata: Invalid metadata object');
     }
     this.metaDocument = meta;
     this.metadata = {};
     this.parse();
   }
   Metadata.prototype = {
     parse: function Metadata_parse() {
       var doc = this.metaDocument;
       var rdf = doc.documentElement;
       if (rdf.nodeName.toLowerCase() !== 'rdf:rdf') { // Wrapped in <xmpmeta>
         rdf = rdf.firstChild;
         while (rdf && rdf.nodeName.toLowerCase() !== 'rdf:rdf') {
           rdf = rdf.nextSibling;
         }
       }
       var nodeName = (rdf) ? rdf.nodeName.toLowerCase() : null;
       if (!rdf || nodeName !== 'rdf:rdf' || !rdf.hasChildNodes()) {
         return;
       }
       var children = rdf.childNodes, desc, entry, name, i, ii, length, iLength;
       for (i = 0, length = children.length; i < length; i++) {
         desc = children[i];
         if (desc.nodeName.toLowerCase() !== 'rdf:description') {
           continue;
         }
         for (ii = 0, iLength = desc.childNodes.length; ii < iLength; ii++) {
           if (desc.childNodes[ii].nodeName.toLowerCase() !== '#text') {
             entry = desc.childNodes[ii];
             name = entry.nodeName.toLowerCase();
             this.metadata[name] = entry.textContent.trim();
           }
         }
       }
     },
     get: function Metadata_get(name) {
       return this.metadata[name] || null;
     },
     has: function Metadata_has(name) {
       return typeof this.metadata[name] !== 'undefined';
     }
   };
   return Metadata;
 })();
 // <canvas> contexts store most of the state we need natively.
 // However, PDF needs a bit more state, which we store here.
 // Minimal font size that would be used during canvas fillText operations.
 var MIN_FONT_SIZE = 16;
 var MAX_GROUP_SIZE = 4096;
 var COMPILE_TYPE3_GLYPHS = true;
 function createScratchCanvas(width, height) {
   var canvas = document.createElement('canvas');
   canvas.width = width;
   canvas.height = height;
   return canvas;
 }
 function addContextCurrentTransform(ctx) {
   // If the context doesn't expose a `mozCurrentTransform`, add a JS based on.
   if (!ctx.mozCurrentTransform) {
     // Store the original context
     ctx._scaleX = ctx._scaleX || 1.0;
     ctx._scaleY = ctx._scaleY || 1.0;
     ctx._originalSave = ctx.save;
     ctx._originalRestore = ctx.restore;
     ctx._originalRotate = ctx.rotate;
     ctx._originalScale = ctx.scale;
     ctx._originalTranslate = ctx.translate;
     ctx._originalTransform = ctx.transform;
     ctx._originalSetTransform = ctx.setTransform;
     ctx._transformMatrix = [ctx._scaleX, 0, 0, ctx._scaleY, 0, 0];
     ctx._transformStack = [];
     Object.defineProperty(ctx, 'mozCurrentTransform', {
       get: function getCurrentTransform() {
         return this._transformMatrix;
       }
     });
     Object.defineProperty(ctx, 'mozCurrentTransformInverse', {
       get: function getCurrentTransformInverse() {
         // Calculation done using WolframAlpha:
         // http://www.wolframalpha.com/input/?
         //   i=Inverse+{{a%2C+c%2C+e}%2C+{b%2C+d%2C+f}%2C+{0%2C+0%2C+1}}
         var m = this._transformMatrix;
         var a = m[0], b = m[1], c = m[2], d = m[3], e = m[4], f = m[5];
         var ad_bc = a * d - b * c;
         var bc_ad = b * c - a * d;
         return [
           d / ad_bc,
           b / bc_ad,
           c / bc_ad,
           a / ad_bc,
           (d * e - c * f) / bc_ad,
           (b * e - a * f) / ad_bc
         ];
       }
     });
     ctx.save = function ctxSave() {
       var old = this._transformMatrix;
       this._transformStack.push(old);
       this._transformMatrix = old.slice(0, 6);
       this._originalSave();
     };
     ctx.restore = function ctxRestore() {
       var prev = this._transformStack.pop();
       if (prev) {
         this._transformMatrix = prev;
         this._originalRestore();
       }
     };
     ctx.translate = function ctxTranslate(x, y) {
       var m = this._transformMatrix;
       m[4] = m[0] * x + m[2] * y + m[4];
       m[5] = m[1] * x + m[3] * y + m[5];
       this._originalTranslate(x, y);
     };
     ctx.scale = function ctxScale(x, y) {
       var m = this._transformMatrix;
       m[0] = m[0] * x;
       m[1] = m[1] * x;
       m[2] = m[2] * y;
       m[3] = m[3] * y;
       this._originalScale(x, y);
     };
     ctx.transform = function ctxTransform(a, b, c, d, e, f) {
       var m = this._transformMatrix;
       this._transformMatrix = [
         m[0] * a + m[2] * b,
         m[1] * a + m[3] * b,
         m[0] * c + m[2] * d,
         m[1] * c + m[3] * d,
         m[0] * e + m[2] * f + m[4],
         m[1] * e + m[3] * f + m[5]
       ];
       ctx._originalTransform(a, b, c, d, e, f);
     };
     ctx.setTransform = function ctxSetTransform(a, b, c, d, e, f) {
       this._transformMatrix = [a, b, c, d, e, f];
       ctx._originalSetTransform(a, b, c, d, e, f);
     };
     ctx.rotate = function ctxRotate(angle) {
       var cosValue = Math.cos(angle);
       var sinValue = Math.sin(angle);
       var m = this._transformMatrix;
       this._transformMatrix = [
         m[0] * cosValue + m[2] * sinValue,
         m[1] * cosValue + m[3] * sinValue,
         m[0] * (-sinValue) + m[2] * cosValue,
         m[1] * (-sinValue) + m[3] * cosValue,
         m[4],
         m[5]
       ];
       this._originalRotate(angle);
     };
   }
 }
 var CachedCanvases = (function CachedCanvasesClosure() {
   var cache = {};
   return {
     getCanvas: function CachedCanvases_getCanvas(id, width, height,
                                                  trackTransform) {
       var canvasEntry;
       if (id in cache) {
         canvasEntry = cache[id];
         canvasEntry.canvas.width = width;
         canvasEntry.canvas.height = height;
         // reset canvas transform for emulated mozCurrentTransform, if needed
         canvasEntry.context.setTransform(1, 0, 0, 1, 0, 0);
       } else {
         var canvas = createScratchCanvas(width, height);
         var ctx = canvas.getContext('2d');
         if (trackTransform) {
           addContextCurrentTransform(ctx);
         }
         cache[id] = canvasEntry = {canvas: canvas, context: ctx};
       }
       return canvasEntry;
     },
     clear: function () {
       cache = {};
     }
   };
 })();
 function compileType3Glyph(imgData) {
   var POINT_TO_PROCESS_LIMIT = 1000;
   var width = imgData.width, height = imgData.height;
   var i, j, j0, width1 = width + 1;
   var points = new Uint8Array(width1 * (height + 1));
   var POINT_TYPES =
       new Uint8Array([0, 2, 4, 0, 1, 0, 5, 4, 8, 10, 0, 8, 0, 2, 1, 0]);
   // decodes bit-packed mask data
   var lineSize = (width + 7) & ~7, data0 = imgData.data;
   var data = new Uint8Array(lineSize * height), pos = 0, ii;
   for (i = 0, ii = data0.length; i < ii; i++) {
     var mask = 128, elem = data0[i];
     while (mask > 0) {
       data[pos++] = (elem & mask) ? 0 : 255;
       mask >>= 1;
     }
   }
   // finding iteresting points: every point is located between mask pixels,
   // so there will be points of the (width + 1)x(height + 1) grid. Every point
   // will have flags assigned based on neighboring mask pixels:
   //   4 | 8
   //   --P--
   //   2 | 1
   // We are interested only in points with the flags:
   //   - outside corners: 1, 2, 4, 8;
   //   - inside corners: 7, 11, 13, 14;
   //   - and, intersections: 5, 10.
   var count = 0;
   pos = 0;
   if (data[pos] !== 0) {
     points[0] = 1;
     ++count;
   }
   for (j = 1; j < width; j++) {
     if (data[pos] !== data[pos + 1]) {
       points[j] = data[pos] ? 2 : 1;
       ++count;
     }
     pos++;
   }
   if (data[pos] !== 0) {
     points[j] = 2;
     ++count;
   }
   for (i = 1; i < height; i++) {
     pos = i * lineSize;
     j0 = i * width1;
     if (data[pos - lineSize] !== data[pos]) {
       points[j0] = data[pos] ? 1 : 8;
       ++count;
     }
     // 'sum' is the position of the current pixel configuration in the 'TYPES'
     // array (in order 8-1-2-4, so we can use '>>2' to shift the column).
     var sum = (data[pos] ? 4 : 0) + (data[pos - lineSize] ? 8 : 0);
     for (j = 1; j < width; j++) {
       sum = (sum >> 2) + (data[pos + 1] ? 4 : 0) +
             (data[pos - lineSize + 1] ? 8 : 0);
       if (POINT_TYPES[sum]) {
         points[j0 + j] = POINT_TYPES[sum];
         ++count;
       }
       pos++;
     }
     if (data[pos - lineSize] !== data[pos]) {
       points[j0 + j] = data[pos] ? 2 : 4;
       ++count;
     }
     if (count > POINT_TO_PROCESS_LIMIT) {
       return null;
     }
   }
   pos = lineSize * (height - 1);
   j0 = i * width1;
   if (data[pos] !== 0) {
     points[j0] = 8;
     ++count;
   }
   for (j = 1; j < width; j++) {
     if (data[pos] !== data[pos + 1]) {
       points[j0 + j] = data[pos] ? 4 : 8;
       ++count;
     }
     pos++;
   }
   if (data[pos] !== 0) {
     points[j0 + j] = 4;
     ++count;
   }
   if (count > POINT_TO_PROCESS_LIMIT) {
     return null;
   }
   // building outlines
   var steps = new Int32Array([0, width1, -1, 0, -width1, 0, 0, 0, 1]);
   var outlines = [];
   for (i = 0; count && i <= height; i++) {
     var p = i * width1;
     var end = p + width;
     while (p < end && !points[p]) {
       p++;
     }
     if (p === end) {
       continue;
     }
     var coords = [p % width1, i];
     var type = points[p], p0 = p, pp;
     do {
       var step = steps[type];
       do {
         p += step;
       } while (!points[p]);
       pp = points[p];
       if (pp !== 5 && pp !== 10) {
         // set new direction
         type = pp;
         // delete mark
         points[p] = 0;
       } else { // type is 5 or 10, ie, a crossing
         // set new direction
         type = pp & ((0x33 * type) >> 4);
         // set new type for "future hit"
         points[p] &= (type >> 2 | type << 2);
       }
       coords.push(p % width1);
       coords.push((p / width1) | 0);
       --count;
     } while (p0 !== p);
     outlines.push(coords);
     --i;
   }
   var drawOutline = function(c) {
     c.save();
     // the path shall be painted in [0..1]x[0..1] space
     c.scale(1 / width, -1 / height);
     c.translate(0, -height);
     c.beginPath();
     for (var i = 0, ii = outlines.length; i < ii; i++) {
       var o = outlines[i];
       c.moveTo(o[0], o[1]);
       for (var j = 2, jj = o.length; j < jj; j += 2) {
         c.lineTo(o[j], o[j+1]);
       }
     }
     c.fill();
     c.beginPath();
     c.restore();
   };
   return drawOutline;
 }
 var CanvasExtraState = (function CanvasExtraStateClosure() {
   function CanvasExtraState(old) {
     // Are soft masks and alpha values shapes or opacities?
     this.alphaIsShape = false;
     this.fontSize = 0;
     this.fontSizeScale = 1;
     this.textMatrix = IDENTITY_MATRIX;
     this.fontMatrix = FONT_IDENTITY_MATRIX;
     this.leading = 0;
     // Current point (in user coordinates)
     this.x = 0;
     this.y = 0;
     // Start of text line (in text coordinates)
     this.lineX = 0;
     this.lineY = 0;
     // Character and word spacing
     this.charSpacing = 0;
     this.wordSpacing = 0;
     this.textHScale = 1;
     this.textRenderingMode = TextRenderingMode.FILL;
     this.textRise = 0;
     // Color spaces
     this.fillColorSpace = ColorSpace.singletons.gray;
     this.fillColorSpaceObj = null;
     this.strokeColorSpace = ColorSpace.singletons.gray;
     this.strokeColorSpaceObj = null;
     this.fillColorObj = null;
     this.strokeColorObj = null;
     // Default fore and background colors
     this.fillColor = '#000000';
     this.strokeColor = '#000000';
     // Note: fill alpha applies to all non-stroking operations
     this.fillAlpha = 1;
     this.strokeAlpha = 1;
     this.lineWidth = 1;
     this.activeSMask = null; // nonclonable field (see the save method below)
     this.old = old;
   }
   CanvasExtraState.prototype = {
     clone: function CanvasExtraState_clone() {
       return Object.create(this);
     },
     setCurrentPoint: function CanvasExtraState_setCurrentPoint(x, y) {
       this.x = x;
       this.y = y;
     }
   };
   return CanvasExtraState;
 })();
 var CanvasGraphics = (function CanvasGraphicsClosure() {
   // Defines the time the executeOperatorList is going to be executing
   // before it stops and shedules a continue of execution.
   var EXECUTION_TIME = 15;
   function CanvasGraphics(canvasCtx, commonObjs, objs, imageLayer) {
     this.ctx = canvasCtx;
     this.current = new CanvasExtraState();
     this.stateStack = [];
     this.pendingClip = null;
     this.pendingEOFill = false;
     this.res = null;
     this.xobjs = null;
     this.commonObjs = commonObjs;
     this.objs = objs;
     this.imageLayer = imageLayer;
     this.groupStack = [];
     this.processingType3 = null;
     // Patterns are painted relative to the initial page/form transform, see pdf
     // spec 8.7.2 NOTE 1.
     this.baseTransform = null;
     this.baseTransformStack = [];
     this.groupLevel = 0;
     this.smaskStack = [];
     this.smaskCounter = 0;
     this.tempSMask = null;
     if (canvasCtx) {
       addContextCurrentTransform(canvasCtx);
     }
   }
   function putBinaryImageData(ctx, imgData) {
     if (typeof ImageData !== 'undefined' && imgData instanceof ImageData) {
       ctx.putImageData(imgData, 0, 0);
       return;
     }
     // Put the image data to the canvas in chunks, rather than putting the
     // whole image at once.  This saves JS memory, because the ImageData object
     // is smaller. It also possibly saves C++ memory within the implementation
     // of putImageData(). (E.g. in Firefox we make two short-lived copies of
     // the data passed to putImageData()). |n| shouldn't be too small, however,
     // because too many putImageData() calls will slow things down.
     //
     // Note: as written, if the last chunk is partial, the putImageData() call
     // will (conceptually) put pixels past the bounds of the canvas.  But
     // that's ok; any such pixels are ignored.
     var height = imgData.height, width = imgData.width;
     var fullChunkHeight = 16;
     var fracChunks = height / fullChunkHeight;
     var fullChunks = Math.floor(fracChunks);
     var totalChunks = Math.ceil(fracChunks);
     var partialChunkHeight = height - fullChunks * fullChunkHeight;
     var chunkImgData = ctx.createImageData(width, fullChunkHeight);
     var srcPos = 0, destPos;
     var src = imgData.data;
     var dest = chunkImgData.data;
     var i, j, thisChunkHeight, elemsInThisChunk;
     // There are multiple forms in which the pixel data can be passed, and
     // imgData.kind tells us which one this is.
     if (imgData.kind === ImageKind.GRAYSCALE_1BPP) {
       // Grayscale, 1 bit per pixel (i.e. black-and-white).
       var srcLength = src.byteLength;
       var dest32 = PDFJS.hasCanvasTypedArrays ? new Uint32Array(dest.buffer) :
         new Uint32ArrayView(dest);
       var dest32DataLength = dest32.length;
       var fullSrcDiff = (width + 7) >> 3;
       var white = 0xFFFFFFFF;
       var black = (PDFJS.isLittleEndian || !PDFJS.hasCanvasTypedArrays) ?
 xFF000000 : 0x000000FF;
       for (i = 0; i < totalChunks; i++) {
         thisChunkHeight =
           (i < fullChunks) ? fullChunkHeight : partialChunkHeight;
         destPos = 0;
         for (j = 0; j < thisChunkHeight; j++) {
           var srcDiff = srcLength - srcPos;
           var k = 0;
           var kEnd = (srcDiff > fullSrcDiff) ? width : srcDiff * 8 - 7;
           var kEndUnrolled = kEnd & ~7;
           var mask = 0;
           var srcByte = 0;
           for (; k < kEndUnrolled; k += 8) {
             srcByte = src[srcPos++];
             dest32[destPos++] = (srcByte & 128) ? white : black;
             dest32[destPos++] = (srcByte & 64) ? white : black;
             dest32[destPos++] = (srcByte & 32) ? white : black;
             dest32[destPos++] = (srcByte & 16) ? white : black;
             dest32[destPos++] = (srcByte & 8) ? white : black;
             dest32[destPos++] = (srcByte & 4) ? white : black;
             dest32[destPos++] = (srcByte & 2) ? white : black;
             dest32[destPos++] = (srcByte & 1) ? white : black;
           }
           for (; k < kEnd; k++) {
              if (mask === 0) {
                srcByte = src[srcPos++];
                mask = 128;
              }
             dest32[destPos++] = (srcByte & mask) ? white : black;
             mask >>= 1;
           }
         }
         // We ran out of input. Make all remaining pixels transparent.
         while (destPos < dest32DataLength) {
           dest32[destPos++] = 0;
         }
         ctx.putImageData(chunkImgData, 0, i * fullChunkHeight);
       }
     } else if (imgData.kind === ImageKind.RGBA_32BPP) {
       // RGBA, 32-bits per pixel.
       for (i = 0; i < totalChunks; i++) {
         thisChunkHeight =
           (i < fullChunks) ? fullChunkHeight : partialChunkHeight;
         elemsInThisChunk = imgData.width * thisChunkHeight * 4;
         dest.set(src.subarray(srcPos, srcPos + elemsInThisChunk));
         srcPos += elemsInThisChunk;
         ctx.putImageData(chunkImgData, 0, i * fullChunkHeight);
       }
     } else if (imgData.kind === ImageKind.RGB_24BPP) {
       // RGB, 24-bits per pixel.
       for (i = 0; i < totalChunks; i++) {
         thisChunkHeight =
           (i < fullChunks) ? fullChunkHeight : partialChunkHeight;
         elemsInThisChunk = imgData.width * thisChunkHeight * 3;
         destPos = 0;
         for (j = 0; j < elemsInThisChunk; j += 3) {
           dest[destPos++] = src[srcPos++];
           dest[destPos++] = src[srcPos++];
           dest[destPos++] = src[srcPos++];
           dest[destPos++] = 255;
         }
         ctx.putImageData(chunkImgData, 0, i * fullChunkHeight);
       }
     } else {
       error('bad image kind: ' + imgData.kind);
     }
   }
   function putBinaryImageMask(ctx, imgData) {
     var height = imgData.height, width = imgData.width;
     var fullChunkHeight = 16;
     var fracChunks = height / fullChunkHeight;
     var fullChunks = Math.floor(fracChunks);
     var totalChunks = Math.ceil(fracChunks);
     var partialChunkHeight = height - fullChunks * fullChunkHeight;
     var chunkImgData = ctx.createImageData(width, fullChunkHeight);
     var srcPos = 0;
     var src = imgData.data;
     var dest = chunkImgData.data;
     for (var i = 0; i < totalChunks; i++) {
       var thisChunkHeight =
         (i < fullChunks) ? fullChunkHeight : partialChunkHeight;
       // Expand the mask so it can be used by the canvas.  Any required
       // inversion has already been handled.
       var destPos = 3; // alpha component offset
       for (var j = 0; j < thisChunkHeight; j++) {
         var mask = 0;
         for (var k = 0; k < width; k++) {
           if (!mask) {
             var elem = src[srcPos++];
             mask = 128;
           }
           dest[destPos] = (elem & mask) ? 0 : 255;
           destPos += 4;
           mask >>= 1;
         }
       }
       ctx.putImageData(chunkImgData, 0, i * fullChunkHeight);
     }
   }
   function copyCtxState(sourceCtx, destCtx) {
     var properties = ['strokeStyle', 'fillStyle', 'fillRule', 'globalAlpha',
                       'lineWidth', 'lineCap', 'lineJoin', 'miterLimit',
                       'globalCompositeOperation', 'font'];
     for (var i = 0, ii = properties.length; i < ii; i++) {
       var property = properties[i];
       if (property in sourceCtx) {
         destCtx[property] = sourceCtx[property];
       }
     }
     if ('setLineDash' in sourceCtx) {
       destCtx.setLineDash(sourceCtx.getLineDash());
       destCtx.lineDashOffset =  sourceCtx.lineDashOffset;
     } else if ('mozDash' in sourceCtx) {
       destCtx.mozDash = sourceCtx.mozDash;
       destCtx.mozDashOffset = sourceCtx.mozDashOffset;
     }
   }
   function genericComposeSMask(maskCtx, layerCtx, width, height,
                                subtype, backdrop) {
     var addBackdropFn;
     if (backdrop) {
       addBackdropFn = function (r0, g0, b0, bytes) {
         var length = bytes.length;
         for (var i = 3; i < length; i += 4) {
           var alpha = bytes[i] / 255;
           if (alpha === 0) {
             bytes[i - 3] = r0;
             bytes[i - 2] = g0;
             bytes[i - 1] = b0;
           } else if (alpha < 1) {
             var alpha_ = 1 - alpha;
             bytes[i - 3] = (bytes[i - 3] * alpha + r0 * alpha_) | 0;
             bytes[i - 2] = (bytes[i - 2] * alpha + g0 * alpha_) | 0;
             bytes[i - 1] = (bytes[i - 1] * alpha + b0 * alpha_) | 0;
           }
         }
       }.bind(null, backdrop[0], backdrop[1], backdrop[2]);
     } else {
       addBackdropFn = function () {};
     }
     var composeFn;
     if (subtype === 'Luminosity') {
       composeFn = function (maskDataBytes, layerDataBytes) {
         var length = maskDataBytes.length;
         for (var i = 3; i < length; i += 4) {
           var y = ((maskDataBytes[i - 3] * 77) +     // * 0.3 / 255 * 0x10000
                    (maskDataBytes[i - 2] * 152) +    // * 0.59 ....
                    (maskDataBytes[i - 1] * 28)) | 0; // * 0.11 ....
           layerDataBytes[i] = (layerDataBytes[i] * y) >> 16;
         }
       };
     } else {
       composeFn = function (maskDataBytes, layerDataBytes) {
         var length = maskDataBytes.length;
         for (var i = 3; i < length; i += 4) {
           var alpha = maskDataBytes[i];
           layerDataBytes[i] = (layerDataBytes[i] * alpha / 255) | 0;
         }
       };
     }
     // processing image in chunks to save memory
     var PIXELS_TO_PROCESS = 65536;
     var chunkSize = Math.min(height, Math.ceil(PIXELS_TO_PROCESS / width));
     for (var row = 0; row < height; row += chunkSize) {
       var chunkHeight = Math.min(chunkSize, height - row);
       var maskData = maskCtx.getImageData(0, row, width, chunkHeight);
       var layerData = layerCtx.getImageData(0, row, width, chunkHeight);
       addBackdropFn(maskData.data);
       composeFn(maskData.data, layerData.data);
       maskCtx.putImageData(layerData, 0, row);
     }
   }
   function composeSMask(ctx, smask, layerCtx) {
     var mask = smask.canvas;
     var maskCtx = smask.context;
     ctx.setTransform(smask.scaleX, 0, 0, smask.scaleY,
                      smask.offsetX, smask.offsetY);
     var backdrop;
     if (smask.backdrop) {
       var cs = smask.colorSpace || ColorSpace.singletons.rgb;
       backdrop = cs.getRgb(smask.backdrop, 0);
     }
     if (WebGLUtils.isEnabled) {
       var composed = WebGLUtils.composeSMask(layerCtx.canvas, mask,
         {subtype: smask.subtype, backdrop: backdrop});
       ctx.setTransform(1, 0, 0, 1, 0, 0);
       ctx.drawImage(composed, smask.offsetX, smask.offsetY);
       return;
     }
     genericComposeSMask(maskCtx, layerCtx, mask.width, mask.height,
                         smask.subtype, backdrop);
     ctx.drawImage(mask, 0, 0);
   }
   var LINE_CAP_STYLES = ['butt', 'round', 'square'];
   var LINE_JOIN_STYLES = ['miter', 'round', 'bevel'];
   var NORMAL_CLIP = {};
   var EO_CLIP = {};
   CanvasGraphics.prototype = {
     beginDrawing: function CanvasGraphics_beginDrawing(viewport, transparency) {
       // For pdfs that use blend modes we have to clear the canvas else certain
       // blend modes can look wrong since we'd be blending with a white
       // backdrop. The problem with a transparent backdrop though is we then
       // don't get sub pixel anti aliasing on text, so we fill with white if
       // we can.
       var width = this.ctx.canvas.width;
       var height = this.ctx.canvas.height;
       if (transparency) {
         this.ctx.clearRect(0, 0, width, height);
       } else {
         this.ctx.mozOpaque = true;
         this.ctx.save();
         this.ctx.fillStyle = 'rgb(255, 255, 255)';
         this.ctx.fillRect(0, 0, width, height);
         this.ctx.restore();
       }
       var transform = viewport.transform;
       this.ctx.save();
       this.ctx.transform.apply(this.ctx, transform);
       this.baseTransform = this.ctx.mozCurrentTransform.slice();
       if (this.imageLayer) {
         this.imageLayer.beginLayout();
       }
     },
     executeOperatorList: function CanvasGraphics_executeOperatorList(
                                     operatorList,
                                     executionStartIdx, continueCallback,
                                     stepper) {
       var argsArray = operatorList.argsArray;
       var fnArray = operatorList.fnArray;
       var i = executionStartIdx || 0;
       var argsArrayLen = argsArray.length;
       // Sometimes the OperatorList to execute is empty.
       if (argsArrayLen == i) {
         return i;
       }
       var endTime = Date.now() + EXECUTION_TIME;
       var commonObjs = this.commonObjs;
       var objs = this.objs;
       var fnId;
       var deferred = Promise.resolve();
       while (true) {
         if (stepper && i === stepper.nextBreakPoint) {
           stepper.breakIt(i, continueCallback);
           return i;
         }
         fnId = fnArray[i];
         if (fnId !== OPS.dependency) {
           this[fnId].apply(this, argsArray[i]);
         } else {
           var deps = argsArray[i];
           for (var n = 0, nn = deps.length; n < nn; n++) {
             var depObjId = deps[n];
             var common = depObjId.substring(0, 2) == 'g_';
             // If the promise isn't resolved yet, add the continueCallback
             // to the promise and bail out.
             if (!common && !objs.isResolved(depObjId)) {
               objs.get(depObjId, continueCallback);
               return i;
             }
             if (common && !commonObjs.isResolved(depObjId)) {
               commonObjs.get(depObjId, continueCallback);
               return i;
             }
           }
         }
         i++;
         // If the entire operatorList was executed, stop as were done.
         if (i == argsArrayLen) {
           return i;
         }
         // If the execution took longer then a certain amount of time, schedule
         // to continue exeution after a short delay.
         // However, this is only possible if a 'continueCallback' is passed in.
         if (continueCallback && Date.now() > endTime) {
           deferred.then(continueCallback);
           return i;
         }
         // If the operatorList isn't executed completely yet OR the execution
         // time was short enough, do another execution round.
       }
     },
     endDrawing: function CanvasGraphics_endDrawing() {
       this.ctx.restore();
       CachedCanvases.clear();
       WebGLUtils.clear();
       if (this.imageLayer) {
         this.imageLayer.endLayout();
       }
     },
     // Graphics state
     setLineWidth: function CanvasGraphics_setLineWidth(width) {
       this.current.lineWidth = width;
       this.ctx.lineWidth = width;
     },
     setLineCap: function CanvasGraphics_setLineCap(style) {
       this.ctx.lineCap = LINE_CAP_STYLES[style];
     },
     setLineJoin: function CanvasGraphics_setLineJoin(style) {
       this.ctx.lineJoin = LINE_JOIN_STYLES[style];
     },
     setMiterLimit: function CanvasGraphics_setMiterLimit(limit) {
       this.ctx.miterLimit = limit;
     },
     setDash: function CanvasGraphics_setDash(dashArray, dashPhase) {
       var ctx = this.ctx;
       if ('setLineDash' in ctx) {
         ctx.setLineDash(dashArray);
         ctx.lineDashOffset = dashPhase;
       } else {
         ctx.mozDash = dashArray;
         ctx.mozDashOffset = dashPhase;
       }
     },
     setRenderingIntent: function CanvasGraphics_setRenderingIntent(intent) {
       // Maybe if we one day fully support color spaces this will be important
       // for now we can ignore.
       // TODO set rendering intent?
     },
     setFlatness: function CanvasGraphics_setFlatness(flatness) {
       // There's no way to control this with canvas, but we can safely ignore.
       // TODO set flatness?
     },
     setGState: function CanvasGraphics_setGState(states) {
       for (var i = 0, ii = states.length; i < ii; i++) {
         var state = states[i];
         var key = state[0];
         var value = state[1];
         switch (key) {
           case 'LW':
             this.setLineWidth(value);
             break;
           case 'LC':
             this.setLineCap(value);
             break;
           case 'LJ':
             this.setLineJoin(value);
             break;
           case 'ML':
             this.setMiterLimit(value);
             break;
           case 'D':
             this.setDash(value[0], value[1]);
             break;
           case 'RI':
             this.setRenderingIntent(value);
             break;
           case 'FL':
             this.setFlatness(value);
             break;
           case 'Font':
             this.setFont(value[0], value[1]);
             break;
           case 'CA':
             this.current.strokeAlpha = state[1];
             break;
           case 'ca':
             this.current.fillAlpha = state[1];
             this.ctx.globalAlpha = state[1];
             break;
           case 'BM':
             if (value && value.name && (value.name !== 'Normal')) {
               var mode = value.name.replace(/([A-Z])/g,
                 function(c) {
                   return '-' + c.toLowerCase();
                 }
               ).substring(1);
               this.ctx.globalCompositeOperation = mode;
               if (this.ctx.globalCompositeOperation !== mode) {
                 warn('globalCompositeOperation "' + mode +
                      '" is not supported');
               }
             } else {
               this.ctx.globalCompositeOperation = 'source-over';
             }
             break;
           case 'SMask':
             if (this.current.activeSMask) {
               this.endSMaskGroup();
             }
             this.current.activeSMask = value ? this.tempSMask : null;
             if (this.current.activeSMask) {
               this.beginSMaskGroup();
             }
             this.tempSMask = null;
             break;
         }
       }
     },
     beginSMaskGroup: function CanvasGraphics_beginSMaskGroup() {
       var activeSMask = this.current.activeSMask;
       var drawnWidth = activeSMask.canvas.width;
       var drawnHeight = activeSMask.canvas.height;
       var cacheId = 'smaskGroupAt' + this.groupLevel;
       var scratchCanvas = CachedCanvases.getCanvas(
         cacheId, drawnWidth, drawnHeight, true);
       var currentCtx = this.ctx;
       var currentTransform = currentCtx.mozCurrentTransform;
       this.ctx.save();
       var groupCtx = scratchCanvas.context;
       groupCtx.scale(1 / activeSMask.scaleX, 1 / activeSMask.scaleY);
       groupCtx.translate(-activeSMask.offsetX, -activeSMask.offsetY);
       groupCtx.transform.apply(groupCtx, currentTransform);
       copyCtxState(currentCtx, groupCtx);
       this.ctx = groupCtx;
       this.setGState([
         ['BM', 'Normal'],
         ['ca', 1],
         ['CA', 1]
       ]);
       this.groupStack.push(currentCtx);
       this.groupLevel++;
     },
     endSMaskGroup: function CanvasGraphics_endSMaskGroup() {
       var groupCtx = this.ctx;
       this.groupLevel--;
       this.ctx = this.groupStack.pop();
       composeSMask(this.ctx, this.current.activeSMask, groupCtx);
       this.ctx.restore();
     },
     save: function CanvasGraphics_save() {
       this.ctx.save();
       var old = this.current;
       this.stateStack.push(old);
       this.current = old.clone();
       if (this.current.activeSMask) {
         this.current.activeSMask = null;
       }
     },
     restore: function CanvasGraphics_restore() {
       var prev = this.stateStack.pop();
       if (prev) {
         if (this.current.activeSMask) {
           this.endSMaskGroup();
         }
         this.current = prev;
         this.ctx.restore();
       }
     },
     transform: function CanvasGraphics_transform(a, b, c, d, e, f) {
       this.ctx.transform(a, b, c, d, e, f);
     },
     // Path
     moveTo: function CanvasGraphics_moveTo(x, y) {
       this.ctx.moveTo(x, y);
       this.current.setCurrentPoint(x, y);
     },
     lineTo: function CanvasGraphics_lineTo(x, y) {
       this.ctx.lineTo(x, y);
       this.current.setCurrentPoint(x, y);
     },
     curveTo: function CanvasGraphics_curveTo(x1, y1, x2, y2, x3, y3) {
       this.ctx.bezierCurveTo(x1, y1, x2, y2, x3, y3);
       this.current.setCurrentPoint(x3, y3);
     },
     curveTo2: function CanvasGraphics_curveTo2(x2, y2, x3, y3) {
       var current = this.current;
       this.ctx.bezierCurveTo(current.x, current.y, x2, y2, x3, y3);
       current.setCurrentPoint(x3, y3);
     },
     curveTo3: function CanvasGraphics_curveTo3(x1, y1, x3, y3) {
       this.curveTo(x1, y1, x3, y3, x3, y3);
       this.current.setCurrentPoint(x3, y3);
     },
     closePath: function CanvasGraphics_closePath() {
       this.ctx.closePath();
     },
     rectangle: function CanvasGraphics_rectangle(x, y, width, height) {
       if (width === 0) {
         width = this.getSinglePixelWidth();
       }
       if (height === 0) {
         height = this.getSinglePixelWidth();
       }
       this.ctx.rect(x, y, width, height);
     },
     stroke: function CanvasGraphics_stroke(consumePath) {
       consumePath = typeof consumePath !== 'undefined' ? consumePath : true;
       var ctx = this.ctx;
       var strokeColor = this.current.strokeColor;
       if (this.current.lineWidth === 0) {
         ctx.lineWidth = this.getSinglePixelWidth();
       }
       // For stroke we want to temporarily change the global alpha to the
       // stroking alpha.
       ctx.globalAlpha = this.current.strokeAlpha;
       if (strokeColor && strokeColor.hasOwnProperty('type') &&
           strokeColor.type === 'Pattern') {
         // for patterns, we transform to pattern space, calculate
         // the pattern, call stroke, and restore to user space
         ctx.save();
         ctx.strokeStyle = strokeColor.getPattern(ctx, this);
         ctx.stroke();
         ctx.restore();
       } else {
         ctx.stroke();
       }
       if (consumePath) {
         this.consumePath();
       }
       // Restore the global alpha to the fill alpha
       ctx.globalAlpha = this.current.fillAlpha;
     },
     closeStroke: function CanvasGraphics_closeStroke() {
       this.closePath();
       this.stroke();
     },
     fill: function CanvasGraphics_fill(consumePath) {
       consumePath = typeof consumePath !== 'undefined' ? consumePath : true;
       var ctx = this.ctx;
       var fillColor = this.current.fillColor;
       var needRestore = false;
       if (fillColor && fillColor.hasOwnProperty('type') &&
           fillColor.type === 'Pattern') {
         ctx.save();
         ctx.fillStyle = fillColor.getPattern(ctx, this);
         needRestore = true;
       }
       if (this.pendingEOFill) {
         if ('mozFillRule' in this.ctx) {
           this.ctx.mozFillRule = 'evenodd';
           this.ctx.fill();
           this.ctx.mozFillRule = 'nonzero';
         } else {
           try {
             this.ctx.fill('evenodd');
           } catch (ex) {
             // shouldn't really happen, but browsers might think differently
             this.ctx.fill();
           }
         }
         this.pendingEOFill = false;
       } else {
         this.ctx.fill();
       }
       if (needRestore) {
         ctx.restore();
       }
       if (consumePath) {
         this.consumePath();
       }
     },
     eoFill: function CanvasGraphics_eoFill() {
       this.pendingEOFill = true;
       this.fill();
     },
     fillStroke: function CanvasGraphics_fillStroke() {
       this.fill(false);
       this.stroke(false);
       this.consumePath();
     },
     eoFillStroke: function CanvasGraphics_eoFillStroke() {
       this.pendingEOFill = true;
       this.fillStroke();
     },
     closeFillStroke: function CanvasGraphics_closeFillStroke() {
       this.closePath();
       this.fillStroke();
     },
     closeEOFillStroke: function CanvasGraphics_closeEOFillStroke() {
       this.pendingEOFill = true;
       this.closePath();
       this.fillStroke();
     },
     endPath: function CanvasGraphics_endPath() {
       this.consumePath();
     },
     // Clipping
     clip: function CanvasGraphics_clip() {
       this.pendingClip = NORMAL_CLIP;
     },
     eoClip: function CanvasGraphics_eoClip() {
       this.pendingClip = EO_CLIP;
     },
     // Text
     beginText: function CanvasGraphics_beginText() {
       this.current.textMatrix = IDENTITY_MATRIX;
       this.current.x = this.current.lineX = 0;
       this.current.y = this.current.lineY = 0;
     },
     endText: function CanvasGraphics_endText() {
       if (!('pendingTextPaths' in this)) {
         this.ctx.beginPath();
         return;
       }
       var paths = this.pendingTextPaths;
       var ctx = this.ctx;
       ctx.save();
       ctx.beginPath();
       for (var i = 0; i < paths.length; i++) {
         var path = paths[i];
         ctx.setTransform.apply(ctx, path.transform);
         ctx.translate(path.x, path.y);
         path.addToPath(ctx, path.fontSize);
       }
       ctx.restore();
       ctx.clip();
       ctx.beginPath();
       delete this.pendingTextPaths;
     },
     setCharSpacing: function CanvasGraphics_setCharSpacing(spacing) {
       this.current.charSpacing = spacing;
     },
     setWordSpacing: function CanvasGraphics_setWordSpacing(spacing) {
       this.current.wordSpacing = spacing;
     },
     setHScale: function CanvasGraphics_setHScale(scale) {
       this.current.textHScale = scale / 100;
     },
     setLeading: function CanvasGraphics_setLeading(leading) {
       this.current.leading = -leading;
     },
     setFont: function CanvasGraphics_setFont(fontRefName, size) {
       var fontObj = this.commonObjs.get(fontRefName);
       var current = this.current;
       if (!fontObj) {
         error('Can\'t find font for ' + fontRefName);
       }
       current.fontMatrix = (fontObj.fontMatrix ?
                             fontObj.fontMatrix : FONT_IDENTITY_MATRIX);
       // A valid matrix needs all main diagonal elements to be non-zero
       // This also ensures we bypass FF bugzilla bug #719844.
       if (current.fontMatrix[0] === 0 ||
           current.fontMatrix[3] === 0) {
         warn('Invalid font matrix for font ' + fontRefName);
       }
       // The spec for Tf (setFont) says that 'size' specifies the font 'scale',
       // and in some docs this can be negative (inverted x-y axes).
       if (size < 0) {
         size = -size;
         current.fontDirection = -1;
       } else {
         current.fontDirection = 1;
       }
       this.current.font = fontObj;
       this.current.fontSize = size;
       if (fontObj.coded) {
         return; // we don't need ctx.font for Type3 fonts
       }
       var name = fontObj.loadedName || 'sans-serif';
       var bold = fontObj.black ? (fontObj.bold ? 'bolder' : 'bold') :
                                  (fontObj.bold ? 'bold' : 'normal');
       var italic = fontObj.italic ? 'italic' : 'normal';
       var typeface = '"' + name + '", ' + fontObj.fallbackName;
       // Some font backends cannot handle fonts below certain size.
       // Keeping the font at minimal size and using the fontSizeScale to change
       // the current transformation matrix before the fillText/strokeText.
       // See https://bugzilla.mozilla.org/show_bug.cgi?id=726227
       var browserFontSize = size >= MIN_FONT_SIZE ? size : MIN_FONT_SIZE;
       this.current.fontSizeScale = browserFontSize != MIN_FONT_SIZE ? 1.0 :
                                    size / MIN_FONT_SIZE;
       var rule = italic + ' ' + bold + ' ' + browserFontSize + 'px ' + typeface;
       this.ctx.font = rule;
     },
     setTextRenderingMode: function CanvasGraphics_setTextRenderingMode(mode) {
       this.current.textRenderingMode = mode;
     },
     setTextRise: function CanvasGraphics_setTextRise(rise) {
       this.current.textRise = rise;
     },
     moveText: function CanvasGraphics_moveText(x, y) {
       this.current.x = this.current.lineX += x;
       this.current.y = this.current.lineY += y;
     },
     setLeadingMoveText: function CanvasGraphics_setLeadingMoveText(x, y) {
       this.setLeading(-y);
       this.moveText(x, y);
     },
     setTextMatrix: function CanvasGraphics_setTextMatrix(a, b, c, d, e, f) {
       this.current.textMatrix = [a, b, c, d, e, f];
       this.current.x = this.current.lineX = 0;
       this.current.y = this.current.lineY = 0;
     },
     nextLine: function CanvasGraphics_nextLine() {
       this.moveText(0, this.current.leading);
     },
     applyTextTransforms: function CanvasGraphics_applyTextTransforms() {
       var ctx = this.ctx;
       var current = this.current;
       ctx.transform.apply(ctx, current.textMatrix);
       ctx.translate(current.x, current.y + current.textRise);
       if (current.fontDirection > 0) {
         ctx.scale(current.textHScale, -1);
       } else {
         ctx.scale(-current.textHScale, 1);
       }
     },
     paintChar: function (character, x, y) {
       var ctx = this.ctx;
       var current = this.current;
       var font = current.font;
       var fontSize = current.fontSize / current.fontSizeScale;
       var textRenderingMode = current.textRenderingMode;
       var fillStrokeMode = textRenderingMode &
         TextRenderingMode.FILL_STROKE_MASK;
       var isAddToPathSet = !!(textRenderingMode &
         TextRenderingMode.ADD_TO_PATH_FLAG);
       var addToPath;
       if (font.disableFontFace || isAddToPathSet) {
         addToPath = font.getPathGenerator(this.commonObjs, character);
       }
       if (font.disableFontFace) {
         ctx.save();
         ctx.translate(x, y);
         ctx.beginPath();
         addToPath(ctx, fontSize);
         if (fillStrokeMode === TextRenderingMode.FILL ||
             fillStrokeMode === TextRenderingMode.FILL_STROKE) {
           ctx.fill();
         }
         if (fillStrokeMode === TextRenderingMode.STROKE ||
             fillStrokeMode === TextRenderingMode.FILL_STROKE) {
           ctx.stroke();
         }
         ctx.restore();
       } else {
         if (fillStrokeMode === TextRenderingMode.FILL ||
             fillStrokeMode === TextRenderingMode.FILL_STROKE) {
           ctx.fillText(character, x, y);
         }
         if (fillStrokeMode === TextRenderingMode.STROKE ||
             fillStrokeMode === TextRenderingMode.FILL_STROKE) {
           ctx.strokeText(character, x, y);
         }
       }
       if (isAddToPathSet) {
         var paths = this.pendingTextPaths || (this.pendingTextPaths = []);
         paths.push({
           transform: ctx.mozCurrentTransform,
           x: x,
           y: y,
           fontSize: fontSize,
           addToPath: addToPath
         });
       }
     },
     get isFontSubpixelAAEnabled() {
       // Checks if anti-aliasing is enabled when scaled text is painted.
       // On Windows GDI scaled fonts looks bad.
       var ctx = document.createElement('canvas').getContext('2d');
       ctx.scale(1.5, 1);
       ctx.fillText('I', 0, 10);
       var data = ctx.getImageData(0, 0, 10, 10).data;
       var enabled = false;
       for (var i = 3; i < data.length; i += 4) {
         if (data[i] > 0 && data[i] < 255) {
           enabled = true;
           break;
         }
       }
       return shadow(this, 'isFontSubpixelAAEnabled', enabled);
     },
     showText: function CanvasGraphics_showText(glyphs) {
       var ctx = this.ctx;
       var current = this.current;
       var font = current.font;
       var fontSize = current.fontSize;
       var fontSizeScale = current.fontSizeScale;
       var charSpacing = current.charSpacing;
       var wordSpacing = current.wordSpacing;
       var textHScale = current.textHScale * current.fontDirection;
       var fontMatrix = current.fontMatrix || FONT_IDENTITY_MATRIX;
       var glyphsLength = glyphs.length;
       var vertical = font.vertical;
       var defaultVMetrics = font.defaultVMetrics;
       var i, glyph, width;
       if (fontSize === 0) {
         return;
       }
       // Type3 fonts - each glyph is a "mini-PDF"
       if (font.coded) {
         ctx.save();
         ctx.transform.apply(ctx, current.textMatrix);
         ctx.translate(current.x, current.y);
         ctx.scale(textHScale, 1);
         for (i = 0; i < glyphsLength; ++i) {
           glyph = glyphs[i];
           if (glyph === null) {
             // word break
             this.ctx.translate(wordSpacing, 0);
             current.x += wordSpacing * textHScale;
             continue;
           }
           this.processingType3 = glyph;
           this.save();
           ctx.scale(fontSize, fontSize);
           ctx.transform.apply(ctx, fontMatrix);
           this.executeOperatorList(glyph.operatorList);
           this.restore();
           var transformed = Util.applyTransform([glyph.width, 0], fontMatrix);
           width = ((transformed[0] * fontSize + charSpacing) *
                    current.fontDirection);
           ctx.translate(width, 0);
           current.x += width * textHScale;
         }
         ctx.restore();
         this.processingType3 = null;
       } else {
         ctx.save();
         this.applyTextTransforms();
         var lineWidth = current.lineWidth;
         var a1 = current.textMatrix[0], b1 = current.textMatrix[1];
         var scale = Math.sqrt(a1 * a1 + b1 * b1);
         if (scale === 0 || lineWidth === 0) {
           lineWidth = this.getSinglePixelWidth();
         } else {
           lineWidth /= scale;
         }
         if (fontSizeScale != 1.0) {
           ctx.scale(fontSizeScale, fontSizeScale);
           lineWidth /= fontSizeScale;
         }
         ctx.lineWidth = lineWidth;
         var x = 0;
         for (i = 0; i < glyphsLength; ++i) {
           glyph = glyphs[i];
           if (glyph === null) {
             // word break
             x += current.fontDirection * wordSpacing;
             continue;
           }
           var restoreNeeded = false;
           var character = glyph.fontChar;
           var vmetric = glyph.vmetric || defaultVMetrics;
           if (vertical) {
             var vx = glyph.vmetric ? vmetric[1] : glyph.width * 0.5;
             vx = -vx * fontSize * current.fontMatrix[0];
             var vy = vmetric[2] * fontSize * current.fontMatrix[0];
           }
           width = vmetric ? -vmetric[0] : glyph.width;
           var charWidth = width * fontSize * current.fontMatrix[0] +
                           charSpacing * current.fontDirection;
           var accent = glyph.accent;
           var scaledX, scaledY, scaledAccentX, scaledAccentY;
           if (vertical) {
             scaledX = vx / fontSizeScale;
             scaledY = (x + vy) / fontSizeScale;
           } else {
             scaledX = x / fontSizeScale;
             scaledY = 0;
           }
           if (font.remeasure && width > 0 && this.isFontSubpixelAAEnabled) {
             // some standard fonts may not have the exact width, trying to
             // rescale per character
             var measuredWidth = ctx.measureText(character).width * 1000 /
               current.fontSize * current.fontSizeScale;
             var characterScaleX = width / measuredWidth;
             restoreNeeded = true;
             ctx.save();
             ctx.scale(characterScaleX, 1);
             scaledX /= characterScaleX;
             if (accent) {
               scaledAccentX /= characterScaleX;
             }
           }
           this.paintChar(character, scaledX, scaledY);
           if (accent) {
             scaledAccentX = scaledX + accent.offset.x / fontSizeScale;
             scaledAccentY = scaledY - accent.offset.y / fontSizeScale;
             this.paintChar(accent.fontChar, scaledAccentX, scaledAccentY);
           }
           x += charWidth;
           if (restoreNeeded) {
             ctx.restore();
           }
         }
         if (vertical) {
           current.y -= x * textHScale;
         } else {
           current.x += x * textHScale;
         }
         ctx.restore();
       }
     },
     showSpacedText: function CanvasGraphics_showSpacedText(arr) {
       var current = this.current;
       var font = current.font;
       var fontSize = current.fontSize;
       // TJ array's number is independent from fontMatrix
       var textHScale = current.textHScale * 0.001 * current.fontDirection;
       var arrLength = arr.length;
       var vertical = font.vertical;
       for (var i = 0; i < arrLength; ++i) {
         var e = arr[i];
         if (isNum(e)) {
           var spacingLength = -e * fontSize * textHScale;
           if (vertical) {
             current.y += spacingLength;
           } else {
             current.x += spacingLength;
           }
         } else {
           this.showText(e);
         }
       }
     },
     nextLineShowText: function CanvasGraphics_nextLineShowText(text) {
       this.nextLine();
       this.showText(text);
     },
     nextLineSetSpacingShowText:
       function CanvasGraphics_nextLineSetSpacingShowText(wordSpacing,
                                                          charSpacing,
                                                          text) {
       this.setWordSpacing(wordSpacing);
       this.setCharSpacing(charSpacing);
       this.nextLineShowText(text);
     },
     // Type3 fonts
     setCharWidth: function CanvasGraphics_setCharWidth(xWidth, yWidth) {
       // We can safely ignore this since the width should be the same
       // as the width in the Widths array.
     },
     setCharWidthAndBounds: function CanvasGraphics_setCharWidthAndBounds(xWidth,
                                                                         yWidth,
                                                                         llx,
                                                                         lly,
                                                                         urx,
                                                                         ury) {
       // TODO According to the spec we're also suppose to ignore any operators
       // that set color or include images while processing this type3 font.
       this.rectangle(llx, lly, urx - llx, ury - lly);
       this.clip();
       this.endPath();
     },
     // Color
     setStrokeColorSpace: function CanvasGraphics_setStrokeColorSpace(raw) {
       this.current.strokeColorSpace = ColorSpace.fromIR(raw);
     },
     setFillColorSpace: function CanvasGraphics_setFillColorSpace(raw) {
       this.current.fillColorSpace = ColorSpace.fromIR(raw);
     },
     setStrokeColor: function CanvasGraphics_setStrokeColor(/*...*/) {
       var cs = this.current.strokeColorSpace;
       var rgbColor = cs.getRgb(arguments, 0);
       var color = Util.makeCssRgb(rgbColor);
       this.ctx.strokeStyle = color;
       this.current.strokeColor = color;
     },
     getColorN_Pattern: function CanvasGraphics_getColorN_Pattern(IR, cs) {
       var pattern;
       if (IR[0] == 'TilingPattern') {
         var args = IR[1];
         var base = cs.base;
         var color;
         if (base) {
           color = base.getRgb(args, 0);
         }
         pattern = new TilingPattern(IR, color, this.ctx, this.objs,
                                     this.commonObjs, this.baseTransform);
       } else {
         pattern = getShadingPatternFromIR(IR);
       }
       return pattern;
     },
     setStrokeColorN: function CanvasGraphics_setStrokeColorN(/*...*/) {
       var cs = this.current.strokeColorSpace;
       if (cs.name == 'Pattern') {
         this.current.strokeColor = this.getColorN_Pattern(arguments, cs);
       } else {
         this.setStrokeColor.apply(this, arguments);
       }
     },
     setFillColor: function CanvasGraphics_setFillColor(/*...*/) {
       var cs = this.current.fillColorSpace;
       var rgbColor = cs.getRgb(arguments, 0);
       var color = Util.makeCssRgb(rgbColor);
       this.ctx.fillStyle = color;
       this.current.fillColor = color;
     },
     setFillColorN: function CanvasGraphics_setFillColorN(/*...*/) {
       var cs = this.current.fillColorSpace;
       if (cs.name == 'Pattern') {
         this.current.fillColor = this.getColorN_Pattern(arguments, cs);
       } else {
         this.setFillColor.apply(this, arguments);
       }
     },
     setStrokeGray: function CanvasGraphics_setStrokeGray(gray) {
       this.current.strokeColorSpace = ColorSpace.singletons.gray;
       var rgbColor = this.current.strokeColorSpace.getRgb(arguments, 0);
       var color = Util.makeCssRgb(rgbColor);
       this.ctx.strokeStyle = color;
       this.current.strokeColor = color;
     },
     setFillGray: function CanvasGraphics_setFillGray(gray) {
       this.current.fillColorSpace = ColorSpace.singletons.gray;
       var rgbColor = this.current.fillColorSpace.getRgb(arguments, 0);
       var color = Util.makeCssRgb(rgbColor);
       this.ctx.fillStyle = color;
       this.current.fillColor = color;
     },
     setStrokeRGBColor: function CanvasGraphics_setStrokeRGBColor(r, g, b) {
       this.current.strokeColorSpace = ColorSpace.singletons.rgb;
       var rgbColor = this.current.strokeColorSpace.getRgb(arguments, 0);
       var color = Util.makeCssRgb(rgbColor);
       this.ctx.strokeStyle = color;
       this.current.strokeColor = color;
     },
     setFillRGBColor: function CanvasGraphics_setFillRGBColor(r, g, b) {
       this.current.fillColorSpace = ColorSpace.singletons.rgb;
       var rgbColor = this.current.fillColorSpace.getRgb(arguments, 0);
       var color = Util.makeCssRgb(rgbColor);
       this.ctx.fillStyle = color;
       this.current.fillColor = color;
     },
     setStrokeCMYKColor: function CanvasGraphics_setStrokeCMYKColor(c, m, y, k) {
       this.current.strokeColorSpace = ColorSpace.singletons.cmyk;
       var color = Util.makeCssCmyk(arguments);
       this.ctx.strokeStyle = color;
       this.current.strokeColor = color;
     },
     setFillCMYKColor: function CanvasGraphics_setFillCMYKColor(c, m, y, k) {
       this.current.fillColorSpace = ColorSpace.singletons.cmyk;
       var color = Util.makeCssCmyk(arguments);
       this.ctx.fillStyle = color;
       this.current.fillColor = color;
     },
     shadingFill: function CanvasGraphics_shadingFill(patternIR) {
       var ctx = this.ctx;
       this.save();
       var pattern = getShadingPatternFromIR(patternIR);
       ctx.fillStyle = pattern.getPattern(ctx, this, true);
       var inv = ctx.mozCurrentTransformInverse;
       if (inv) {
         var canvas = ctx.canvas;
         var width = canvas.width;
         var height = canvas.height;
         var bl = Util.applyTransform([0, 0], inv);
         var br = Util.applyTransform([0, height], inv);
         var ul = Util.applyTransform([width, 0], inv);
         var ur = Util.applyTransform([width, height], inv);
         var x0 = Math.min(bl[0], br[0], ul[0], ur[0]);
         var y0 = Math.min(bl[1], br[1], ul[1], ur[1]);
         var x1 = Math.max(bl[0], br[0], ul[0], ur[0]);
         var y1 = Math.max(bl[1], br[1], ul[1], ur[1]);
         this.ctx.fillRect(x0, y0, x1 - x0, y1 - y0);
       } else {
         // HACK to draw the gradient onto an infinite rectangle.
         // PDF gradients are drawn across the entire image while
         // Canvas only allows gradients to be drawn in a rectangle
         // The following bug should allow us to remove this.
         // https://bugzilla.mozilla.org/show_bug.cgi?id=664884
         this.ctx.fillRect(-1e10, -1e10, 2e10, 2e10);
       }
       this.restore();
     },
     // Images
     beginInlineImage: function CanvasGraphics_beginInlineImage() {
       error('Should not call beginInlineImage');
     },
     beginImageData: function CanvasGraphics_beginImageData() {
       error('Should not call beginImageData');
     },
     paintFormXObjectBegin: function CanvasGraphics_paintFormXObjectBegin(matrix,
                                                                         bbox) {
       this.save();
       this.baseTransformStack.push(this.baseTransform);
       if (matrix && isArray(matrix) && 6 == matrix.length) {
         this.transform.apply(this, matrix);
       }
       this.baseTransform = this.ctx.mozCurrentTransform;
       if (bbox && isArray(bbox) && 4 == bbox.length) {
         var width = bbox[2] - bbox[0];
         var height = bbox[3] - bbox[1];
         this.rectangle(bbox[0], bbox[1], width, height);
         this.clip();
         this.endPath();
       }
     },
     paintFormXObjectEnd: function CanvasGraphics_paintFormXObjectEnd() {
       this.restore();
       this.baseTransform = this.baseTransformStack.pop();
     },
     beginGroup: function CanvasGraphics_beginGroup(group) {
       this.save();
       var currentCtx = this.ctx;
       // TODO non-isolated groups - according to Rik at adobe non-isolated
       // group results aren't usually that different and they even have tools
       // that ignore this setting. Notes from Rik on implmenting:
       // - When you encounter an transparency group, create a new canvas with
       // the dimensions of the bbox
       // - copy the content from the previous canvas to the new canvas
       // - draw as usual
       // - remove the backdrop alpha:
       // alphaNew = 1 - (1 - alpha)/(1 - alphaBackdrop) with 'alpha' the alpha
       // value of your transparency group and 'alphaBackdrop' the alpha of the
       // backdrop
       // - remove background color:
       // colorNew = color - alphaNew *colorBackdrop /(1 - alphaNew)
       if (!group.isolated) {
         info('TODO: Support non-isolated groups.');
       }
       // TODO knockout - supposedly possible with the clever use of compositing
       // modes.
       if (group.knockout) {
         warn('Knockout groups not supported.');
       }
       var currentTransform = currentCtx.mozCurrentTransform;
       if (group.matrix) {
         currentCtx.transform.apply(currentCtx, group.matrix);
       }
       assert(group.bbox, 'Bounding box is required.');
       // Based on the current transform figure out how big the bounding box
       // will actually be.
       var bounds = Util.getAxialAlignedBoundingBox(
                     group.bbox,
                     currentCtx.mozCurrentTransform);
       // Clip the bounding box to the current canvas.
       var canvasBounds = [0,
 ,
                           currentCtx.canvas.width,
                           currentCtx.canvas.height];
       bounds = Util.intersect(bounds, canvasBounds) || [0, 0, 0, 0];
       // Use ceil in case we're between sizes so we don't create canvas that is
       // too small and make the canvas at least 1x1 pixels.
       var offsetX = Math.floor(bounds[0]);
       var offsetY = Math.floor(bounds[1]);
       var drawnWidth = Math.max(Math.ceil(bounds[2]) - offsetX, 1);
       var drawnHeight = Math.max(Math.ceil(bounds[3]) - offsetY, 1);
       var scaleX = 1, scaleY = 1;
       if (drawnWidth > MAX_GROUP_SIZE) {
         scaleX = drawnWidth / MAX_GROUP_SIZE;
         drawnWidth = MAX_GROUP_SIZE;
       }
       if (drawnHeight > MAX_GROUP_SIZE) {
         scaleY = drawnHeight / MAX_GROUP_SIZE;
         drawnHeight = MAX_GROUP_SIZE;
       }
       var cacheId = 'groupAt' + this.groupLevel;
       if (group.smask) {
         // Using two cache entries is case if masks are used one after another.
         cacheId +=  '_smask_' + ((this.smaskCounter++) % 2);
       }
       var scratchCanvas = CachedCanvases.getCanvas(
         cacheId, drawnWidth, drawnHeight, true);
       var groupCtx = scratchCanvas.context;
       // Since we created a new canvas that is just the size of the bounding box
       // we have to translate the group ctx.
       groupCtx.scale(1 / scaleX, 1 / scaleY);
       groupCtx.translate(-offsetX, -offsetY);
       groupCtx.transform.apply(groupCtx, currentTransform);
       if (group.smask) {
         // Saving state and cached mask to be used in setGState.
         this.smaskStack.push({
           canvas: scratchCanvas.canvas,
           context: groupCtx,
           offsetX: offsetX,
           offsetY: offsetY,
           scaleX: scaleX,
           scaleY: scaleY,
           subtype: group.smask.subtype,
           backdrop: group.smask.backdrop,
           colorSpace: group.colorSpace && ColorSpace.fromIR(group.colorSpace)
         });
       } else {
         // Setup the current ctx so when the group is popped we draw it at the
         // right location.
         currentCtx.setTransform(1, 0, 0, 1, 0, 0);
         currentCtx.translate(offsetX, offsetY);
         currentCtx.scale(scaleX, scaleY);
       }
       // The transparency group inherits all off the current graphics state
       // except the blend mode, soft mask, and alpha constants.
       copyCtxState(currentCtx, groupCtx);
       this.ctx = groupCtx;
       this.setGState([
         ['BM', 'Normal'],
         ['ca', 1],
         ['CA', 1]
       ]);
       this.groupStack.push(currentCtx);
       this.groupLevel++;
     },
     endGroup: function CanvasGraphics_endGroup(group) {
       this.groupLevel--;
       var groupCtx = this.ctx;
       this.ctx = this.groupStack.pop();
       // Turn off image smoothing to avoid sub pixel interpolation which can
       // look kind of blurry for some pdfs.
       if ('imageSmoothingEnabled' in this.ctx) {
         this.ctx.imageSmoothingEnabled = false;
       } else {
         this.ctx.mozImageSmoothingEnabled = false;
       }
       if (group.smask) {
         this.tempSMask = this.smaskStack.pop();
       } else {
         this.ctx.drawImage(groupCtx.canvas, 0, 0);
       }
       this.restore();
     },
     beginAnnotations: function CanvasGraphics_beginAnnotations() {
       this.save();
       this.current = new CanvasExtraState();
     },
     endAnnotations: function CanvasGraphics_endAnnotations() {
       this.restore();
     },
     beginAnnotation: function CanvasGraphics_beginAnnotation(rect, transform,
                                                              matrix) {
       this.save();
       if (rect && isArray(rect) && 4 == rect.length) {
         var width = rect[2] - rect[0];
         var height = rect[3] - rect[1];
         this.rectangle(rect[0], rect[1], width, height);
         this.clip();
         this.endPath();
       }
       this.transform.apply(this, transform);
       this.transform.apply(this, matrix);
     },
     endAnnotation: function CanvasGraphics_endAnnotation() {
       this.restore();
     },
     paintJpegXObject: function CanvasGraphics_paintJpegXObject(objId, w, h) {
       var domImage = this.objs.get(objId);
       if (!domImage) {
         warn('Dependent image isn\'t ready yet');
         return;
       }
       this.save();
       var ctx = this.ctx;
       // scale the image to the unit square
       ctx.scale(1 / w, -1 / h);
       ctx.drawImage(domImage, 0, 0, domImage.width, domImage.height,
 , -h, w, h);
       if (this.imageLayer) {
         var currentTransform = ctx.mozCurrentTransformInverse;
         var position = this.getCanvasPosition(0, 0);
         this.imageLayer.appendImage({
           objId: objId,
           left: position[0],
           top: position[1],
           width: w / currentTransform[0],
           height: h / currentTransform[3]
         });
       }
       this.restore();
     },
     paintImageMaskXObject: function CanvasGraphics_paintImageMaskXObject(img) {
       var ctx = this.ctx;
       var width = img.width, height = img.height;
       var glyph = this.processingType3;
       if (COMPILE_TYPE3_GLYPHS && glyph && !('compiled' in glyph)) {
         var MAX_SIZE_TO_COMPILE = 1000;
         if (width <= MAX_SIZE_TO_COMPILE && height <= MAX_SIZE_TO_COMPILE) {
           glyph.compiled =
             compileType3Glyph({data: img.data, width: width, height: height});
         } else {
           glyph.compiled = null;
         }
       }
       if (glyph && glyph.compiled) {
         glyph.compiled(ctx);
         return;
       }
       var maskCanvas = CachedCanvases.getCanvas('maskCanvas', width, height);
       var maskCtx = maskCanvas.context;
       maskCtx.save();
       putBinaryImageMask(maskCtx, img);
       maskCtx.globalCompositeOperation = 'source-in';
       var fillColor = this.current.fillColor;
       maskCtx.fillStyle = (fillColor && fillColor.hasOwnProperty('type') &&
                           fillColor.type === 'Pattern') ?
                           fillColor.getPattern(maskCtx, this) : fillColor;
       maskCtx.fillRect(0, 0, width, height);
       maskCtx.restore();
       this.paintInlineImageXObject(maskCanvas.canvas);
     },
     paintImageMaskXObjectRepeat:
       function CanvasGraphics_paintImageMaskXObjectRepeat(imgData, scaleX,
                                                           scaleY, positions) {
       var width = imgData.width;
       var height = imgData.height;
       var ctx = this.ctx;
       var maskCanvas = CachedCanvases.getCanvas('maskCanvas', width, height);
       var maskCtx = maskCanvas.context;
       maskCtx.save();
       putBinaryImageMask(maskCtx, imgData);
       maskCtx.globalCompositeOperation = 'source-in';
       var fillColor = this.current.fillColor;
       maskCtx.fillStyle = (fillColor && fillColor.hasOwnProperty('type') &&
         fillColor.type === 'Pattern') ?
         fillColor.getPattern(maskCtx, this) : fillColor;
       maskCtx.fillRect(0, 0, width, height);
       maskCtx.restore();
       for (var i = 0, ii = positions.length; i < ii; i += 2) {
         ctx.save();
         ctx.transform(scaleX, 0, 0, scaleY, positions[i], positions[i + 1]);
         ctx.scale(1, -1);
         ctx.drawImage(maskCanvas.canvas, 0, 0, width, height,
 , -1, 1, 1);
         ctx.restore();
       }
     },
     paintImageMaskXObjectGroup:
       function CanvasGraphics_paintImageMaskXObjectGroup(images) {
       var ctx = this.ctx;
       for (var i = 0, ii = images.length; i < ii; i++) {
         var image = images[i];
         var width = image.width, height = image.height;
         var maskCanvas = CachedCanvases.getCanvas('maskCanvas', width, height);
         var maskCtx = maskCanvas.context;
         maskCtx.save();
         putBinaryImageMask(maskCtx, image);
         maskCtx.globalCompositeOperation = 'source-in';
         var fillColor = this.current.fillColor;
         maskCtx.fillStyle = (fillColor && fillColor.hasOwnProperty('type') &&
                             fillColor.type === 'Pattern') ?
                             fillColor.getPattern(maskCtx, this) : fillColor;
         maskCtx.fillRect(0, 0, width, height);
         maskCtx.restore();
         ctx.save();
         ctx.transform.apply(ctx, image.transform);
         ctx.scale(1, -1);
         ctx.drawImage(maskCanvas.canvas, 0, 0, width, height,
 , -1, 1, 1);
         ctx.restore();
       }
     },
     paintImageXObject: function CanvasGraphics_paintImageXObject(objId) {
       var imgData = this.objs.get(objId);
       if (!imgData) {
         warn('Dependent image isn\'t ready yet');
         return;
       }
       this.paintInlineImageXObject(imgData);
     },
     paintImageXObjectRepeat:
       function CanvasGraphics_paintImageXObjectRepeat(objId, scaleX, scaleY,
                                                           positions) {
       var imgData = this.objs.get(objId);
       if (!imgData) {
         warn('Dependent image isn\'t ready yet');
         return;
       }
       var width = imgData.width;
       var height = imgData.height;
       var map = [];
       for (var i = 0, ii = positions.length; i < ii; i += 2) {
         map.push({transform: [scaleX, 0, 0, scaleY, positions[i],
                  positions[i + 1]], x: 0, y: 0, w: width, h: height});
       }
       this.paintInlineImageXObjectGroup(imgData, map);
     },
     paintInlineImageXObject:
       function CanvasGraphics_paintInlineImageXObject(imgData) {
       var width = imgData.width;
       var height = imgData.height;
       var ctx = this.ctx;
       this.save();
       // scale the image to the unit square
       ctx.scale(1 / width, -1 / height);
       var currentTransform = ctx.mozCurrentTransformInverse;
       var a = currentTransform[0], b = currentTransform[1];
       var widthScale = Math.max(Math.sqrt(a * a + b * b), 1);
       var c = currentTransform[2], d = currentTransform[3];
       var heightScale = Math.max(Math.sqrt(c * c + d * d), 1);
       var imgToPaint, tmpCanvas;
       // instanceof HTMLElement does not work in jsdom node.js module
       if (imgData instanceof HTMLElement || !imgData.data) {
         imgToPaint = imgData;
       } else {
         tmpCanvas = CachedCanvases.getCanvas('inlineImage', width, height);
         var tmpCtx = tmpCanvas.context;
         putBinaryImageData(tmpCtx, imgData);
         imgToPaint = tmpCanvas.canvas;
       }
       var paintWidth = width, paintHeight = height;
       var tmpCanvasId = 'prescale1';
       // Vertial or horizontal scaling shall not be more than 2 to not loose the
       // pixels during drawImage operation, painting on the temporary canvas(es)
       // that are twice smaller in size
       while ((widthScale > 2 && paintWidth > 1) ||
              (heightScale > 2 && paintHeight > 1)) {
         var newWidth = paintWidth, newHeight = paintHeight;
         if (widthScale > 2 && paintWidth > 1) {
           newWidth = Math.ceil(paintWidth / 2);
           widthScale /= paintWidth / newWidth;
         }
         if (heightScale > 2 && paintHeight > 1) {
           newHeight = Math.ceil(paintHeight / 2);
           heightScale /= paintHeight / newHeight;
         }
         tmpCanvas = CachedCanvases.getCanvas(tmpCanvasId, newWidth, newHeight);
         tmpCtx = tmpCanvas.context;
         tmpCtx.clearRect(0, 0, newWidth, newHeight);
         tmpCtx.drawImage(imgToPaint, 0, 0, paintWidth, paintHeight,
 , 0, newWidth, newHeight);
         imgToPaint = tmpCanvas.canvas;
         paintWidth = newWidth;
         paintHeight = newHeight;
         tmpCanvasId = tmpCanvasId === 'prescale1' ? 'prescale2' : 'prescale1';
       }
       ctx.drawImage(imgToPaint, 0, 0, paintWidth, paintHeight,
 , -height, width, height);
       if (this.imageLayer) {
         var position = this.getCanvasPosition(0, -height);
         this.imageLayer.appendImage({
           imgData: imgData,
           left: position[0],
           top: position[1],
           width: width / currentTransform[0],
           height: height / currentTransform[3]
         });
       }
       this.restore();
     },
     paintInlineImageXObjectGroup:
       function CanvasGraphics_paintInlineImageXObjectGroup(imgData, map) {
       var ctx = this.ctx;
       var w = imgData.width;
       var h = imgData.height;
       var tmpCanvas = CachedCanvases.getCanvas('inlineImage', w, h);
       var tmpCtx = tmpCanvas.context;
       putBinaryImageData(tmpCtx, imgData);
       for (var i = 0, ii = map.length; i < ii; i++) {
         var entry = map[i];
         ctx.save();
         ctx.transform.apply(ctx, entry.transform);
         ctx.scale(1, -1);
         ctx.drawImage(tmpCanvas.canvas, entry.x, entry.y, entry.w, entry.h,
 , -1, 1, 1);
         if (this.imageLayer) {
           var position = this.getCanvasPosition(entry.x, entry.y);
           this.imageLayer.appendImage({
             imgData: imgData,
             left: position[0],
             top: position[1],
             width: w,
             height: h
           });
         }
         ctx.restore();
       }
     },
     paintSolidColorImageMask:
       function CanvasGraphics_paintSolidColorImageMask() {
         this.ctx.fillRect(0, 0, 1, 1);
     },
     // Marked content
     markPoint: function CanvasGraphics_markPoint(tag) {
       // TODO Marked content.
     },
     markPointProps: function CanvasGraphics_markPointProps(tag, properties) {
       // TODO Marked content.
     },
     beginMarkedContent: function CanvasGraphics_beginMarkedContent(tag) {
       // TODO Marked content.
     },
     beginMarkedContentProps: function CanvasGraphics_beginMarkedContentProps(
                                         tag, properties) {
       // TODO Marked content.
     },
     endMarkedContent: function CanvasGraphics_endMarkedContent() {
       // TODO Marked content.
     },
     // Compatibility
     beginCompat: function CanvasGraphics_beginCompat() {
       // TODO ignore undefined operators (should we do that anyway?)
     },
     endCompat: function CanvasGraphics_endCompat() {
       // TODO stop ignoring undefined operators
     },
     // Helper functions
     consumePath: function CanvasGraphics_consumePath() {
       if (this.pendingClip) {
         if (this.pendingClip == EO_CLIP) {
           if ('mozFillRule' in this.ctx) {
             this.ctx.mozFillRule = 'evenodd';
             this.ctx.clip();
             this.ctx.mozFillRule = 'nonzero';
           } else {
             try {
               this.ctx.clip('evenodd');
             } catch (ex) {
               // shouldn't really happen, but browsers might think differently
               this.ctx.clip();
             }
           }
         } else {
           this.ctx.clip();
         }
         this.pendingClip = null;
       }
       this.ctx.beginPath();
     },
     getSinglePixelWidth: function CanvasGraphics_getSinglePixelWidth(scale) {
       var inverse = this.ctx.mozCurrentTransformInverse;
       // max of the current horizontal and vertical scale
       return Math.sqrt(Math.max(
         (inverse[0] * inverse[0] + inverse[1] * inverse[1]),
         (inverse[2] * inverse[2] + inverse[3] * inverse[3])));
     },
     getCanvasPosition: function CanvasGraphics_getCanvasPosition(x, y) {
         var transform = this.ctx.mozCurrentTransform;
         return [
           transform[0] * x + transform[2] * y + transform[4],
           transform[1] * x + transform[3] * y + transform[5]
         ];
     }
   };
   for (var op in OPS) {
     CanvasGraphics.prototype[OPS[op]] = CanvasGraphics.prototype[op];
   }
   return CanvasGraphics;
 })();
 var WebGLUtils = (function WebGLUtilsClosure() {
   function loadShader(gl, code, shaderType) {
     var shader = gl.createShader(shaderType);
     gl.shaderSource(shader, code);
     gl.compileShader(shader);
     var compiled = gl.getShaderParameter(shader, gl.COMPILE_STATUS);
     if (!compiled) {
       var errorMsg = gl.getShaderInfoLog(shader);
       throw new Error('Error during shader compilation: ' + errorMsg);
     }
     return shader;
   }
   function createVertexShader(gl, code) {
     return loadShader(gl, code, gl.VERTEX_SHADER);
   }
   function createFragmentShader(gl, code) {
     return loadShader(gl, code, gl.FRAGMENT_SHADER);
   }
   function createProgram(gl, shaders) {
     var program = gl.createProgram();
     for (var i = 0, ii = shaders.length; i < ii; ++i) {
       gl.attachShader(program, shaders[i]);
     }
     gl.linkProgram(program);
     var linked = gl.getProgramParameter(program, gl.LINK_STATUS);
     if (!linked) {
       var errorMsg = gl.getProgramInfoLog(program);
       throw new Error('Error during program linking: ' + errorMsg);
     }
     return program;
   }
   function createTexture(gl, image, textureId) {
     gl.activeTexture(textureId);
     var texture = gl.createTexture();
     gl.bindTexture(gl.TEXTURE_2D, texture);
     // Set the parameters so we can render any size image.
     gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
     gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
     gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
     gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
     // Upload the image into the texture.
     gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, image);
     return texture;
   }
   var currentGL, currentCanvas;
   function generageGL() {
     if (currentGL) {
       return;
     }
     currentCanvas = document.createElement('canvas');
     currentGL = currentCanvas.getContext('webgl',
       { premultipliedalpha: false });
   }
   var smaskVertexShaderCode = '\
   attribute vec2 a_position;                                    \
   attribute vec2 a_texCoord;                                    \
                                                                 \
   uniform vec2 u_resolution;                                    \
                                                                 \
   varying vec2 v_texCoord;                                      \
                                                                 \
   void main() {                                                 \
     vec2 clipSpace = (a_position / u_resolution) * 2.0 - 1.0;   \
     gl_Position = vec4(clipSpace * vec2(1, -1), 0, 1);          \
                                                                 \
     v_texCoord = a_texCoord;                                    \
   }                                                             ';
   var smaskFragmentShaderCode = '\
   precision mediump float;                                      \
                                                                 \
   uniform vec4 u_backdrop;                                      \
   uniform int u_subtype;                                        \
   uniform sampler2D u_image;                                    \
   uniform sampler2D u_mask;                                     \
                                                                 \
   varying vec2 v_texCoord;                                      \
                                                                 \
   void main() {                                                 \
     vec4 imageColor = texture2D(u_image, v_texCoord);           \
     vec4 maskColor = texture2D(u_mask, v_texCoord);             \
     if (u_backdrop.a > 0.0) {                                   \
       maskColor.rgb = maskColor.rgb * maskColor.a +             \
                       u_backdrop.rgb * (1.0 - maskColor.a);     \
     }                                                           \
     float lum;                                                  \
     if (u_subtype == 0) {                                       \
       lum = maskColor.a;                                        \
     } else {                                                    \
       lum = maskColor.r * 0.3 + maskColor.g * 0.59 +            \
             maskColor.b * 0.11;                                 \
     }                                                           \
     imageColor.a *= lum;                                        \
     imageColor.rgb *= imageColor.a;                             \
     gl_FragColor = imageColor;                                  \
   }                                                             ';
   var smaskCache = null;
   function initSmaskGL() {
     var canvas, gl;
     generageGL();
     canvas = currentCanvas;
     currentCanvas = null;
     gl = currentGL;
     currentGL = null;
     // setup a GLSL program
     var vertexShader = createVertexShader(gl, smaskVertexShaderCode);
     var fragmentShader = createFragmentShader(gl, smaskFragmentShaderCode);
     var program = createProgram(gl, [vertexShader, fragmentShader]);
     gl.useProgram(program);
     var cache = {};
     cache.gl = gl;
     cache.canvas = canvas;
     cache.resolutionLocation = gl.getUniformLocation(program, 'u_resolution');
     cache.positionLocation = gl.getAttribLocation(program, 'a_position');
     cache.backdropLocation = gl.getUniformLocation(program, 'u_backdrop');
     cache.subtypeLocation = gl.getUniformLocation(program, 'u_subtype');
     var texCoordLocation = gl.getAttribLocation(program, 'a_texCoord');
     var texLayerLocation = gl.getUniformLocation(program, 'u_image');
     var texMaskLocation = gl.getUniformLocation(program, 'u_mask');
     // provide texture coordinates for the rectangle.
     var texCoordBuffer = gl.createBuffer();
     gl.bindBuffer(gl.ARRAY_BUFFER, texCoordBuffer);
     gl.bufferData(gl.ARRAY_BUFFER, new Float32Array([
 .0,  0.0,
 .0,  0.0,
 .0,  1.0,
 .0,  1.0,
 .0,  0.0,
 .0,  1.0]), gl.STATIC_DRAW);
     gl.enableVertexAttribArray(texCoordLocation);
     gl.vertexAttribPointer(texCoordLocation, 2, gl.FLOAT, false, 0, 0);
     gl.uniform1i(texLayerLocation, 0);
     gl.uniform1i(texMaskLocation, 1);
     smaskCache = cache;
   }
   function composeSMask(layer, mask, properties) {
     var width = layer.width, height = layer.height;
     if (!smaskCache) {
       initSmaskGL();
     }
     var cache = smaskCache,canvas = cache.canvas, gl = cache.gl;
     canvas.width = width;
     canvas.height = height;
     gl.viewport(0, 0, gl.drawingBufferWidth, gl.drawingBufferHeight);
     gl.uniform2f(cache.resolutionLocation, width, height);
     if (properties.backdrop) {
       gl.uniform4f(cache.resolutionLocation, properties.backdrop[0],
                    properties.backdrop[1], properties.backdrop[2], 1);
     } else {
       gl.uniform4f(cache.resolutionLocation, 0, 0, 0, 0);
     }
     gl.uniform1i(cache.subtypeLocation,
                  properties.subtype === 'Luminosity' ? 1 : 0);
     // Create a textures
     var texture = createTexture(gl, layer, gl.TEXTURE0);
     var maskTexture = createTexture(gl, mask, gl.TEXTURE1);
     // Create a buffer and put a single clipspace rectangle in
     // it (2 triangles)
     var buffer = gl.createBuffer();
     gl.bindBuffer(gl.ARRAY_BUFFER, buffer);
     gl.bufferData(gl.ARRAY_BUFFER, new Float32Array([
 , 0,
       width, 0,
 , height,
 , height,
       width, 0,
       width, height]), gl.STATIC_DRAW);
     gl.enableVertexAttribArray(cache.positionLocation);
     gl.vertexAttribPointer(cache.positionLocation, 2, gl.FLOAT, false, 0, 0);
     // draw
     gl.clearColor(0, 0, 0, 0);
     gl.enable(gl.BLEND);
     gl.blendFunc(gl.ONE, gl.ONE_MINUS_SRC_ALPHA);
     gl.clear(gl.COLOR_BUFFER_BIT);
     gl.drawArrays(gl.TRIANGLES, 0, 6);
     gl.flush();
     gl.deleteTexture(texture);
     gl.deleteTexture(maskTexture);
     gl.deleteBuffer(buffer);
     return canvas;
   }
   var figuresVertexShaderCode = '\
   attribute vec2 a_position;                                    \
   attribute vec3 a_color;                                       \
                                                                 \
   uniform vec2 u_resolution;                                    \
   uniform vec2 u_scale;                                         \
   uniform vec2 u_offset;                                        \
                                                                 \
   varying vec4 v_color;                                         \
                                                                 \
   void main() {                                                 \
     vec2 position = (a_position + u_offset) * u_scale;          \
     vec2 clipSpace = (position / u_resolution) * 2.0 - 1.0;     \
     gl_Position = vec4(clipSpace * vec2(1, -1), 0, 1);          \
                                                                 \
     v_color = vec4(a_color / 255.0, 1.0);                       \
   }                                                             ';
   var figuresFragmentShaderCode = '\
   precision mediump float;                                      \
                                                                 \
   varying vec4 v_color;                                         \
                                                                 \
   void main() {                                                 \
     gl_FragColor = v_color;                                     \
   }                                                             ';
   var figuresCache = null;
   function initFiguresGL() {
     var canvas, gl;
     generageGL();
     canvas = currentCanvas;
     currentCanvas = null;
     gl = currentGL;
     currentGL = null;
     // setup a GLSL program
     var vertexShader = createVertexShader(gl, figuresVertexShaderCode);
     var fragmentShader = createFragmentShader(gl, figuresFragmentShaderCode);
     var program = createProgram(gl, [vertexShader, fragmentShader]);
     gl.useProgram(program);
     var cache = {};
     cache.gl = gl;
     cache.canvas = canvas;
     cache.resolutionLocation = gl.getUniformLocation(program, 'u_resolution');
     cache.scaleLocation = gl.getUniformLocation(program, 'u_scale');
     cache.offsetLocation = gl.getUniformLocation(program, 'u_offset');
     cache.positionLocation = gl.getAttribLocation(program, 'a_position');
     cache.colorLocation = gl.getAttribLocation(program, 'a_color');
     figuresCache = cache;
   }
   function drawFigures(width, height, backgroundColor, figures, context) {
     if (!figuresCache) {
       initFiguresGL();
     }
     var cache = figuresCache, canvas = cache.canvas, gl = cache.gl;
     canvas.width = width;
     canvas.height = height;
     gl.viewport(0, 0, gl.drawingBufferWidth, gl.drawingBufferHeight);
     gl.uniform2f(cache.resolutionLocation, width, height);
     // count triangle points
     var count = 0;
     var i, ii, rows;
     for (i = 0, ii = figures.length; i < ii; i++) {
       switch (figures[i].type) {
         case 'lattice':
           rows = (figures[i].coords.length / figures[i].verticesPerRow) | 0;
           count += (rows - 1) * (figures[i].verticesPerRow - 1) * 6;
           break;
         case 'triangles':
           count += figures[i].coords.length;
           break;
       }
     }
     // transfer data
     var coords = new Float32Array(count * 2);
     var colors = new Uint8Array(count * 3);
     var coordsMap = context.coords, colorsMap = context.colors;
     var pIndex = 0, cIndex = 0;
     for (i = 0, ii = figures.length; i < ii; i++) {
       var figure = figures[i], ps = figure.coords, cs = figure.colors;
       switch (figure.type) {
         case 'lattice':
           var cols = figure.verticesPerRow;
           rows = (ps.length / cols) | 0;
           for (var row = 1; row < rows; row++) {
             var offset = row * cols + 1;
             for (var col = 1; col < cols; col++, offset++) {
               coords[pIndex] = coordsMap[ps[offset - cols - 1]];
               coords[pIndex + 1] = coordsMap[ps[offset - cols - 1] + 1];
               coords[pIndex + 2] = coordsMap[ps[offset - cols]];
               coords[pIndex + 3] = coordsMap[ps[offset - cols] + 1];
               coords[pIndex + 4] = coordsMap[ps[offset - 1]];
               coords[pIndex + 5] = coordsMap[ps[offset - 1] + 1];
               colors[cIndex] = colorsMap[cs[offset - cols - 1]];
               colors[cIndex + 1] = colorsMap[cs[offset - cols - 1] + 1];
               colors[cIndex + 2] = colorsMap[cs[offset - cols - 1] + 2];
               colors[cIndex + 3] = colorsMap[cs[offset - cols]];
               colors[cIndex + 4] = colorsMap[cs[offset - cols] + 1];
               colors[cIndex + 5] = colorsMap[cs[offset - cols] + 2];
               colors[cIndex + 6] = colorsMap[cs[offset - 1]];
               colors[cIndex + 7] = colorsMap[cs[offset - 1] + 1];
               colors[cIndex + 8] = colorsMap[cs[offset - 1] + 2];
               coords[pIndex + 6] = coords[pIndex + 2];
               coords[pIndex + 7] = coords[pIndex + 3];
               coords[pIndex + 8] = coords[pIndex + 4];
               coords[pIndex + 9] = coords[pIndex + 5];
               coords[pIndex + 10] = coordsMap[ps[offset]];
               coords[pIndex + 11] = coordsMap[ps[offset] + 1];
               colors[cIndex + 9] = colors[cIndex + 3];
               colors[cIndex + 10] = colors[cIndex + 4];
               colors[cIndex + 11] = colors[cIndex + 5];
               colors[cIndex + 12] = colors[cIndex + 6];
               colors[cIndex + 13] = colors[cIndex + 7];
               colors[cIndex + 14] = colors[cIndex + 8];
               colors[cIndex + 15] = colorsMap[cs[offset]];
               colors[cIndex + 16] = colorsMap[cs[offset] + 1];
               colors[cIndex + 17] = colorsMap[cs[offset] + 2];
               pIndex += 12;
               cIndex += 18;
             }
           }
           break;
         case 'triangles':
           for (var j = 0, jj = ps.length; j < jj; j++) {
             coords[pIndex] = coordsMap[ps[j]];
             coords[pIndex + 1] = coordsMap[ps[j] + 1];
             colors[cIndex] = colorsMap[cs[i]];
             colors[cIndex + 1] = colorsMap[cs[j] + 1];
             colors[cIndex + 2] = colorsMap[cs[j] + 2];
             pIndex += 2;
             cIndex += 3;
           }
           break;
       }
     }
     // draw
     if (backgroundColor) {
       gl.clearColor(backgroundColor[0] / 255, backgroundColor[1] / 255,
                     backgroundColor[2] / 255, 1.0);
     } else {
       gl.clearColor(0, 0, 0, 0);
     }
     gl.clear(gl.COLOR_BUFFER_BIT);
     var coordsBuffer = gl.createBuffer();
     gl.bindBuffer(gl.ARRAY_BUFFER, coordsBuffer);
     gl.bufferData(gl.ARRAY_BUFFER, coords, gl.STATIC_DRAW);
     gl.enableVertexAttribArray(cache.positionLocation);
     gl.vertexAttribPointer(cache.positionLocation, 2, gl.FLOAT, false, 0, 0);
     var colorsBuffer = gl.createBuffer();
     gl.bindBuffer(gl.ARRAY_BUFFER, colorsBuffer);
     gl.bufferData(gl.ARRAY_BUFFER, colors, gl.STATIC_DRAW);
     gl.enableVertexAttribArray(cache.colorLocation);
     gl.vertexAttribPointer(cache.colorLocation, 3, gl.UNSIGNED_BYTE, false,
 , 0);
     gl.uniform2f(cache.scaleLocation, context.scaleX, context.scaleY);
     gl.uniform2f(cache.offsetLocation, context.offsetX, context.offsetY);
     gl.drawArrays(gl.TRIANGLES, 0, count);
     gl.flush();
     gl.deleteBuffer(coordsBuffer);
     gl.deleteBuffer(colorsBuffer);
     return canvas;
   }
   function cleanup() {
     smaskCache = null;
     figuresCache = null;
   }
   return {
     get isEnabled() {
       if (PDFJS.disableWebGL) {
         return false;
       }
       var enabled = false;
       try {
         generageGL();
         enabled = !!currentGL;
       } catch (e) { }
       return shadow(this, 'isEnabled', enabled);
     },
     composeSMask: composeSMask,
     drawFigures: drawFigures,
     clear: cleanup
   };
 })();
 var ShadingIRs = {};
 ShadingIRs.RadialAxial = {
   fromIR: function RadialAxial_fromIR(raw) {
     var type = raw[1];
     var colorStops = raw[2];
     var p0 = raw[3];
     var p1 = raw[4];
     var r0 = raw[5];
     var r1 = raw[6];
     return {
       type: 'Pattern',
       getPattern: function RadialAxial_getPattern(ctx) {
         var grad;
         if (type === 'axial') {
           grad = ctx.createLinearGradient(p0[0], p0[1], p1[0], p1[1]);
         } else if (type === 'radial') {
           grad = ctx.createRadialGradient(p0[0], p0[1], r0, p1[0], p1[1], r1);
         }
         for (var i = 0, ii = colorStops.length; i < ii; ++i) {
           var c = colorStops[i];
           grad.addColorStop(c[0], c[1]);
         }
         return grad;
       }
     };
   }
 };
 var createMeshCanvas = (function createMeshCanvasClosure() {
   function drawTriangle(data, context, p1, p2, p3, c1, c2, c3) {
     // Very basic Gouraud-shaded triangle rasterization algorithm.
     var coords = context.coords, colors = context.colors;
     var bytes = data.data, rowSize = data.width * 4;
     var tmp;
     if (coords[p1 + 1] > coords[p2 + 1]) {
       tmp = p1; p1 = p2; p2 = tmp; tmp = c1; c1 = c2; c2 = tmp;
     }
     if (coords[p2 + 1] > coords[p3 + 1]) {
       tmp = p2; p2 = p3; p3 = tmp; tmp = c2; c2 = c3; c3 = tmp;
     }
     if (coords[p1 + 1] > coords[p2 + 1]) {
       tmp = p1; p1 = p2; p2 = tmp; tmp = c1; c1 = c2; c2 = tmp;
     }
     var x1 = (coords[p1] + context.offsetX) * context.scaleX;
     var y1 = (coords[p1 + 1] + context.offsetY) * context.scaleY;
     var x2 = (coords[p2] + context.offsetX) * context.scaleX;
     var y2 = (coords[p2 + 1] + context.offsetY) * context.scaleY;
     var x3 = (coords[p3] + context.offsetX) * context.scaleX;
     var y3 = (coords[p3 + 1] + context.offsetY) * context.scaleY;
     if (y1 >= y3) {
       return;
     }
     var c1r = colors[c1], c1g = colors[c1 + 1], c1b = colors[c1 + 2];
     var c2r = colors[c2], c2g = colors[c2 + 1], c2b = colors[c2 + 2];
     var c3r = colors[c3], c3g = colors[c3 + 1], c3b = colors[c3 + 2];
     var minY = Math.round(y1), maxY = Math.round(y3);
     var xa, car, cag, cab;
     var xb, cbr, cbg, cbb;
     var k;
     for (var y = minY; y <= maxY; y++) {
       if (y < y2) {
         k = y < y1 ? 0 : y1 === y2 ? 1 : (y1 - y) / (y1 - y2);
         xa = x1 - (x1 - x2) * k;
         car = c1r - (c1r - c2r) * k;
         cag = c1g - (c1g - c2g) * k;
         cab = c1b - (c1b - c2b) * k;
       } else {
         k = y > y3 ? 1 : y2 === y3 ? 0 : (y2 - y) / (y2 - y3);
         xa = x2 - (x2 - x3) * k;
         car = c2r - (c2r - c3r) * k;
         cag = c2g - (c2g - c3g) * k;
         cab = c2b - (c2b - c3b) * k;
       }
       k = y < y1 ? 0 : y > y3 ? 1 : (y1 - y) / (y1 - y3);
       xb = x1 - (x1 - x3) * k;
       cbr = c1r - (c1r - c3r) * k;
       cbg = c1g - (c1g - c3g) * k;
       cbb = c1b - (c1b - c3b) * k;
       var x1_ = Math.round(Math.min(xa, xb));
       var x2_ = Math.round(Math.max(xa, xb));
       var j = rowSize * y + x1_ * 4;
       for (var x = x1_; x <= x2_; x++) {
         k = (xa - x) / (xa - xb);
         k = k < 0 ? 0 : k > 1 ? 1 : k;
         bytes[j++] = (car - (car - cbr) * k) | 0;
         bytes[j++] = (cag - (cag - cbg) * k) | 0;
         bytes[j++] = (cab - (cab - cbb) * k) | 0;
         bytes[j++] = 255;
       }
     }
   }
   function drawFigure(data, figure, context) {
     var ps = figure.coords;
     var cs = figure.colors;
     var i, ii;
     switch (figure.type) {
       case 'lattice':
         var verticesPerRow = figure.verticesPerRow;
         var rows = Math.floor(ps.length / verticesPerRow) - 1;
         var cols = verticesPerRow - 1;
         for (i = 0; i < rows; i++) {
           var q = i * verticesPerRow;
           for (var j = 0; j < cols; j++, q++) {
             drawTriangle(data, context,
               ps[q], ps[q + 1], ps[q + verticesPerRow],
               cs[q], cs[q + 1], cs[q + verticesPerRow]);
             drawTriangle(data, context,
               ps[q + verticesPerRow + 1], ps[q + 1], ps[q + verticesPerRow],
               cs[q + verticesPerRow + 1], cs[q + 1], cs[q + verticesPerRow]);
           }
         }
         break;
       case 'triangles':
         for (i = 0, ii = ps.length; i < ii; i += 3) {
           drawTriangle(data, context,
             ps[i], ps[i + 1], ps[i + 2],
             cs[i], cs[i + 1], cs[i + 2]);
         }
         break;
       default:
         error('illigal figure');
         break;
     }
   }
   function createMeshCanvas(bounds, combinesScale, coords, colors, figures,
                             backgroundColor) {
     // we will increase scale on some weird factor to let antialiasing take
     // care of "rough" edges
     var EXPECTED_SCALE = 1.1;
     // MAX_PATTERN_SIZE is used to avoid OOM situation.
     var MAX_PATTERN_SIZE = 3000; // 10in @ 300dpi shall be enough
     var offsetX = Math.floor(bounds[0]);
     var offsetY = Math.floor(bounds[1]);
     var boundsWidth = Math.ceil(bounds[2]) - offsetX;
     var boundsHeight = Math.ceil(bounds[3]) - offsetY;
     var width = Math.min(Math.ceil(Math.abs(boundsWidth * combinesScale[0] *
       EXPECTED_SCALE)), MAX_PATTERN_SIZE);
     var height = Math.min(Math.ceil(Math.abs(boundsHeight * combinesScale[1] *
       EXPECTED_SCALE)), MAX_PATTERN_SIZE);
     var scaleX = boundsWidth / width;
     var scaleY = boundsHeight / height;
     var context = {
       coords: coords,
       colors: colors,
       offsetX: -offsetX,
       offsetY: -offsetY,
       scaleX: 1 / scaleX,
       scaleY: 1 / scaleY
     };
     var canvas, tmpCanvas, i, ii;
     if (WebGLUtils.isEnabled) {
       canvas = WebGLUtils.drawFigures(width, height, backgroundColor,
                                       figures, context);
       // https://bugzilla.mozilla.org/show_bug.cgi?id=972126
       tmpCanvas = CachedCanvases.getCanvas('mesh', width, height, false);
       tmpCanvas.context.drawImage(canvas, 0, 0);
       canvas = tmpCanvas.canvas;
     } else {
       tmpCanvas = CachedCanvases.getCanvas('mesh', width, height, false);
       var tmpCtx = tmpCanvas.context;
       var data = tmpCtx.createImageData(width, height);
       if (backgroundColor) {
         var bytes = data.data;
         for (i = 0, ii = bytes.length; i < ii; i += 4) {
           bytes[i] = backgroundColor[0];
           bytes[i + 1] = backgroundColor[1];
           bytes[i + 2] = backgroundColor[2];
           bytes[i + 3] = 255;
         }
       }
       for (i = 0; i < figures.length; i++) {
         drawFigure(data, figures[i], context);
       }
       tmpCtx.putImageData(data, 0, 0);
       canvas = tmpCanvas.canvas;
     }
     return {canvas: canvas, offsetX: offsetX, offsetY: offsetY,
             scaleX: scaleX, scaleY: scaleY};
   }
   return createMeshCanvas;
 })();
 ShadingIRs.Mesh = {
   fromIR: function Mesh_fromIR(raw) {
     //var type = raw[1];
     var coords = raw[2];
     var colors = raw[3];
     var figures = raw[4];
     var bounds = raw[5];
     var matrix = raw[6];
     //var bbox = raw[7];
     var background = raw[8];
     return {
       type: 'Pattern',
       getPattern: function Mesh_getPattern(ctx, owner, shadingFill) {
         var combinedScale;
         // Obtain scale from matrix and current transformation matrix.
         if (shadingFill) {
           combinedScale = Util.singularValueDecompose2dScale(
             ctx.mozCurrentTransform);
         } else {
           var matrixScale = Util.singularValueDecompose2dScale(matrix);
           var curMatrixScale = Util.singularValueDecompose2dScale(
             owner.baseTransform);
           combinedScale = [matrixScale[0] * curMatrixScale[0],
             matrixScale[1] * curMatrixScale[1]];
         }
         // Rasterizing on the main thread since sending/queue large canvases
         // might cause OOM.
         var temporaryPatternCanvas = createMeshCanvas(bounds, combinedScale,
           coords, colors, figures, shadingFill ? null : background);
         if (!shadingFill) {
           ctx.setTransform.apply(ctx, owner.baseTransform);
           if (matrix) {
             ctx.transform.apply(ctx, matrix);
           }
         }
         ctx.translate(temporaryPatternCanvas.offsetX,
                       temporaryPatternCanvas.offsetY);
         ctx.scale(temporaryPatternCanvas.scaleX,
                   temporaryPatternCanvas.scaleY);
         return ctx.createPattern(temporaryPatternCanvas.canvas, 'no-repeat');
       }
     };
   }
 };
 ShadingIRs.Dummy = {
   fromIR: function Dummy_fromIR() {
     return {
       type: 'Pattern',
       getPattern: function Dummy_fromIR_getPattern() {
         return 'hotpink';
       }
     };
   }
 };
 function getShadingPatternFromIR(raw) {
   var shadingIR = ShadingIRs[raw[0]];
   if (!shadingIR) {
     error('Unknown IR type: ' + raw[0]);
   }
   return shadingIR.fromIR(raw);
 }
 var TilingPattern = (function TilingPatternClosure() {
   var PaintType = {
     COLORED: 1,
     UNCOLORED: 2
   };
   var MAX_PATTERN_SIZE = 3000; // 10in @ 300dpi shall be enough
   function TilingPattern(IR, color, ctx, objs, commonObjs, baseTransform) {
     this.name = IR[1][0].name;
     this.operatorList = IR[2];
     this.matrix = IR[3] || [1, 0, 0, 1, 0, 0];
     this.bbox = IR[4];
     this.xstep = IR[5];
     this.ystep = IR[6];
     this.paintType = IR[7];
     this.tilingType = IR[8];
     this.color = color;
     this.objs = objs;
     this.commonObjs = commonObjs;
     this.baseTransform = baseTransform;
     this.type = 'Pattern';
     this.ctx = ctx;
   }
   TilingPattern.prototype = {
     createPatternCanvas: function TilinPattern_createPatternCanvas(owner) {
       var operatorList = this.operatorList;
       var bbox = this.bbox;
       var xstep = this.xstep;
       var ystep = this.ystep;
       var paintType = this.paintType;
       var tilingType = this.tilingType;
       var color = this.color;
       var objs = this.objs;
       var commonObjs = this.commonObjs;
       info('TilingType: ' + tilingType);
       var x0 = bbox[0], y0 = bbox[1], x1 = bbox[2], y1 = bbox[3];
       var topLeft = [x0, y0];
       // we want the canvas to be as large as the step size
       var botRight = [x0 + xstep, y0 + ystep];
       var width = botRight[0] - topLeft[0];
       var height = botRight[1] - topLeft[1];
       // Obtain scale from matrix and current transformation matrix.
       var matrixScale = Util.singularValueDecompose2dScale(this.matrix);
       var curMatrixScale = Util.singularValueDecompose2dScale(
         this.baseTransform);
       var combinedScale = [matrixScale[0] * curMatrixScale[0],
         matrixScale[1] * curMatrixScale[1]];
       // MAX_PATTERN_SIZE is used to avoid OOM situation.
       // Use width and height values that are as close as possible to the end
       // result when the pattern is used. Too low value makes the pattern look
       // blurry. Too large value makes it look too crispy.
       width = Math.min(Math.ceil(Math.abs(width * combinedScale[0])),
         MAX_PATTERN_SIZE);
       height = Math.min(Math.ceil(Math.abs(height * combinedScale[1])),
         MAX_PATTERN_SIZE);
       var tmpCanvas = CachedCanvases.getCanvas('pattern', width, height, true);
       var tmpCtx = tmpCanvas.context;
       var graphics = new CanvasGraphics(tmpCtx, commonObjs, objs);
       graphics.groupLevel = owner.groupLevel;
       this.setFillAndStrokeStyleToContext(tmpCtx, paintType, color);
       this.setScale(width, height, xstep, ystep);
       this.transformToScale(graphics);
       // transform coordinates to pattern space
       var tmpTranslate = [1, 0, 0, 1, -topLeft[0], -topLeft[1]];
       graphics.transform.apply(graphics, tmpTranslate);
       this.clipBbox(graphics, bbox, x0, y0, x1, y1);
       graphics.executeOperatorList(operatorList);
       return tmpCanvas.canvas;
     },
     setScale: function TilingPattern_setScale(width, height, xstep, ystep) {
       this.scale = [width / xstep, height / ystep];
     },
     transformToScale: function TilingPattern_transformToScale(graphics) {
       var scale = this.scale;
       var tmpScale = [scale[0], 0, 0, scale[1], 0, 0];
       graphics.transform.apply(graphics, tmpScale);
     },
     scaleToContext: function TilingPattern_scaleToContext() {
       var scale = this.scale;
       this.ctx.scale(1 / scale[0], 1 / scale[1]);
     },
     clipBbox: function clipBbox(graphics, bbox, x0, y0, x1, y1) {
       if (bbox && isArray(bbox) && 4 == bbox.length) {
         var bboxWidth = x1 - x0;
         var bboxHeight = y1 - y0;
         graphics.rectangle(x0, y0, bboxWidth, bboxHeight);
         graphics.clip();
         graphics.endPath();
       }
     },
     setFillAndStrokeStyleToContext:
       function setFillAndStrokeStyleToContext(context, paintType, color) {
         switch (paintType) {
           case PaintType.COLORED:
             var ctx = this.ctx;
             context.fillStyle = ctx.fillStyle;
             context.strokeStyle = ctx.strokeStyle;
             break;
           case PaintType.UNCOLORED:
             var rgbColor = ColorSpace.singletons.rgb.getRgb(color, 0);
             var cssColor = Util.makeCssRgb(rgbColor);
             context.fillStyle = cssColor;
             context.strokeStyle = cssColor;
             break;
           default:
             error('Unsupported paint type: ' + paintType);
         }
       },
     getPattern: function TilingPattern_getPattern(ctx, owner) {
       var temporaryPatternCanvas = this.createPatternCanvas(owner);
       ctx = this.ctx;
       ctx.setTransform.apply(ctx, this.baseTransform);
       ctx.transform.apply(ctx, this.matrix);
       this.scaleToContext();
       return ctx.createPattern(temporaryPatternCanvas, 'repeat');
     }
   };
   return TilingPattern;
 })();
 PDFJS.disableFontFace = false;
 var FontLoader = {
   insertRule: function fontLoaderInsertRule(rule) {
     var styleElement = document.getElementById('PDFJS_FONT_STYLE_TAG');
     if (!styleElement) {
       styleElement = document.createElement('style');
       styleElement.id = 'PDFJS_FONT_STYLE_TAG';
       document.documentElement.getElementsByTagName('head')[0].appendChild(
         styleElement);
     }
     var styleSheet = styleElement.sheet;
     styleSheet.insertRule(rule, styleSheet.cssRules.length);
   },
   clear: function fontLoaderClear() {
     var styleElement = document.getElementById('PDFJS_FONT_STYLE_TAG');
     if (styleElement) {
       styleElement.parentNode.removeChild(styleElement);
     }
   },
   bind: function fontLoaderBind(fonts, callback) {
     assert(!isWorker, 'bind() shall be called from main thread');
     for (var i = 0, ii = fonts.length; i < ii; i++) {
       var font = fonts[i];
       if (font.attached) {
         continue;
       }
       font.attached = true;
       font.bindDOM()
     }
     setTimeout(callback);
   }
 };
 var FontFace = (function FontFaceClosure() {
   function FontFace(name, file, properties) {
     this.compiledGlyphs = {};
     if (arguments.length === 1) {
       // importing translated data
       var data = arguments[0];
       for (var i in data) {
         this[i] = data[i];
       }
       return;
     }
   }
   FontFace.prototype = {
     bindDOM: function FontFace_bindDOM() {
       if (!this.data) {
         return null;
       }
       if (PDFJS.disableFontFace) {
         this.disableFontFace = true;
         return null;
       }
       var data = bytesToString(new Uint8Array(this.data));
       var fontName = this.loadedName;
       // Add the font-face rule to the document
       var url = ('url(data:' + this.mimetype + ';base64,' +
                  window.btoa(data) + ');');
       var rule = '@font-face { font-family:"' + fontName + '";src:' + url + '}';
       FontLoader.insertRule(rule);
       if (PDFJS.pdfBug && 'FontInspector' in globalScope &&
           globalScope['FontInspector'].enabled) {
         globalScope['FontInspector'].fontAdded(this, url);
       }
       return rule;
     },
     getPathGenerator: function (objs, character) {
       if (!(character in this.compiledGlyphs)) {
         var js = objs.get(this.loadedName + '_path_' + character);
         /*jshint -W054 */
         this.compiledGlyphs[character] = new Function('c', 'size', js);
       }
       return this.compiledGlyphs[character];
     }
   };
   return FontFace;
 })();
 }).call((typeof window === 'undefined') ? this : window);