From cf88b7b2123beec63dbc1907eaa79c66f84c4477 Mon Sep 17 00:00:00 2001
From: Jonas Jenwald <jonas.jenwald@gmail.com>
Date: Tue, 19 Dec 2017 14:57:08 +0100
Subject: [PATCH] Remove the `ImageData.set` polyfill

This is only relevant for browsers that we don't intend to support with PDF.js version `2.0`.
---
 src/shared/compatibility.js | 54 -------------------------------------
 1 file changed, 54 deletions(-)

diff --git a/src/shared/compatibility.js b/src/shared/compatibility.js
index d65c7b4d0..e9e35a734 100644
--- a/src/shared/compatibility.js
+++ b/src/shared/compatibility.js
@@ -25,8 +25,6 @@ var globalScope = require('./global_scope');
 
 var userAgent = (typeof navigator !== 'undefined' && navigator.userAgent) || '';
 var isAndroid = /Android/.test(userAgent);
-var isAndroidPre5 = /Android\s[0-4][^\d]/.test(userAgent);
-var isChrome = userAgent.indexOf('Chrom') >= 0;
 var isIOSChrome = userAgent.indexOf('CriOS') >= 0;
 var isIE = userAgent.indexOf('Trident') >= 0;
 var isIOS = /\b(iPad|iPhone|iPod)(?=;)/.test(userAgent);
@@ -75,58 +73,6 @@ PDFJS.compatibilityChecked = true;
   }
 })();
 
-// Support: IE<11, Chrome<21, Android<4.4, Safari<6
-(function checkSetPresenceInImageData() {
-  if (!hasDOM) {
-    return;
-  }
-  // IE < 11 will use window.CanvasPixelArray which lacks set function.
-  if (window.CanvasPixelArray) {
-    if (typeof window.CanvasPixelArray.prototype.set !== 'function') {
-      window.CanvasPixelArray.prototype.set = function(arr) {
-        for (var i = 0, ii = this.length; i < ii; i++) {
-          this[i] = arr[i];
-        }
-      };
-    }
-  } else {
-    // Old Chrome and Android use an inaccessible CanvasPixelArray prototype.
-    // Because we cannot feature detect it, we rely on user agent parsing.
-    var polyfill = false, versionMatch;
-    if (isChrome) {
-      versionMatch = userAgent.match(/Chrom(e|ium)\/([0-9]+)\./);
-      // Chrome < 21 lacks the set function.
-      polyfill = versionMatch && parseInt(versionMatch[2]) < 21;
-    } else if (isAndroid) {
-      // Android < 4.4 lacks the set function.
-      // Android >= 4.4 will contain Chrome in the user agent,
-      // thus pass the Chrome check above and not reach this block.
-      polyfill = isAndroidPre5;
-    } else if (isSafari) {
-      versionMatch = userAgent.
-        match(/Version\/([0-9]+)\.([0-9]+)\.([0-9]+) Safari\//);
-      // Safari < 6 lacks the set function.
-      polyfill = versionMatch && parseInt(versionMatch[1]) < 6;
-    }
-
-    if (polyfill) {
-      var contextPrototype = window.CanvasRenderingContext2D.prototype;
-      var createImageData = contextPrototype.createImageData;
-      contextPrototype.createImageData = function(w, h) {
-        var imageData = createImageData.call(this, w, h);
-        imageData.data.set = function(arr) {
-          for (var i = 0, ii = this.length; i < ii; i++) {
-            this[i] = arr[i];
-          }
-        };
-        return imageData;
-      };
-      // this closure will be kept referenced, so clear its vars
-      contextPrototype = null;
-    }
-  }
-})();
-
 // Support: Android, iOS
 (function checkCanvasSizeLimitation() {
   if (isIOS || isAndroid) {