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Fixes CanvasPixelArray set polyfill for chrome < 21 (#4974)

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This commit is contained in:
Fabian Lange 2014-06-24 12:12:17 +02:00
parent 10db93be29
commit 9fd6cc7f1e
1 changed files with 21 additions and 2 deletions
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23
web/compatibility.js
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@ -481,9 +481,9 @@ if (typeof PDFJS === 'undefined') {
} }
})(); })();
// TODO CanvasPixelArray is deprecated; use Uint8ClampedArray // Support: IE<11, Chrome<21
// once it's supported.
(function checkSetPresenceInImageData() { (function checkSetPresenceInImageData() {
// IE < 11 will use window.CanvasPixelArray which lacks set function.
if (window.CanvasPixelArray) { if (window.CanvasPixelArray) {
if (typeof window.CanvasPixelArray.prototype.set !== 'function') { if (typeof window.CanvasPixelArray.prototype.set !== 'function') {
window.CanvasPixelArray.prototype.set = function(arr) { window.CanvasPixelArray.prototype.set = function(arr) {
@ -492,6 +492,25 @@ if (typeof PDFJS === 'undefined') {
} }
}; };
} }
} else {
// Chrome < 21 uses an inaccessible CanvasPixelArray prototype.
// Because we cannot feature detect it, we rely on user agent.
if (navigator.userAgent.indexOf('Chrom') >= 0) {
var versionMatch = navigator.userAgent.match(/Chrom(e|ium)\/([0-9]+)\./);
if (versionMatch && parseInt(versionMatch[2]) < 21) {
var contextPrototype = window.CanvasRenderingContext2D.prototype;
contextPrototype._createImageData = contextPrototype.createImageData;
contextPrototype.createImageData = function(w, h) {
var imageData = this._createImageData(w, h);
imageData.data.set = function(arr) {
for (var i = 0, ii = this.length; i < ii; i++) {
this[i] = arr[i];
}
};
return imageData;
};
}
}
} }
})(); })();