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@ -481,7 +481,7 @@ if (typeof PDFJS === 'undefined') {
@@ -481,7 +481,7 @@ if (typeof PDFJS === 'undefined') {
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} |
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})(); |
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// Support: IE<11, Chrome<21
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// Support: IE<11, Chrome<21, Android<4.4
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(function checkSetPresenceInImageData() { |
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// IE < 11 will use window.CanvasPixelArray which lacks set function.
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if (window.CanvasPixelArray) { |
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@ -493,11 +493,26 @@ if (typeof PDFJS === 'undefined') {
@@ -493,11 +493,26 @@ if (typeof PDFJS === 'undefined') {
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}; |
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} |
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} else { |
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// Chrome < 21 uses an inaccessible CanvasPixelArray prototype.
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// Because we cannot feature detect it, we rely on user agent.
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// Old Chrome and Android use an inaccessible CanvasPixelArray prototype.
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// Because we cannot feature detect it, we rely on user agent parsing.
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var polyfill = false; |
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if (navigator.userAgent.indexOf('Chrom') >= 0) { |
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var versionMatch = navigator.userAgent.match(/Chrom(e|ium)\/([0-9]+)\./); |
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if (versionMatch && parseInt(versionMatch[2]) < 21) { |
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// Chrome < 21 lacks the set function.
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polyfill = true; |
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} |
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} else if (navigator.userAgent.indexOf('Android') >= 0) { |
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// Android < 4.4 lacks the set function.
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// Android >= 4.4 will contain Chrome in the user agent,
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// thus pass the Chrome check above and not reach this block.
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var isOldAndroid = /Android\s[0-4][^\d]/g.test(navigator.userAgent); |
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if (isOldAndroid) { |
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polyfill = true; |
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} |
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} |
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if (polyfill) { |
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var contextPrototype = window.CanvasRenderingContext2D.prototype; |
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contextPrototype._createImageData = contextPrototype.createImageData; |
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contextPrototype.createImageData = function(w, h) { |
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@ -511,7 +526,6 @@ if (typeof PDFJS === 'undefined') {
@@ -511,7 +526,6 @@ if (typeof PDFJS === 'undefined') {
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}; |
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} |
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} |
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} |
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})(); |
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// Support: IE<10, Android<4.0, iOS
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