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test if canvas has become tainted

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This commit is contained in:
Niklas von Hertzen 2012-03-01 18:44:52 +02:00
parent 1447b031c6
commit c86d12b915
1 changed files with 28 additions and 14 deletions
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16
src/plugins/jquery.plugin.html2canvas.js
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@ -23,7 +23,11 @@
if (options && options.profile && window.console && window.console.profileEnd) {
console.profileEnd();
}
$canvas.css({ position: 'absolute', left: 0, top: 0 }).appendTo(document.body);
$canvas.css({
position: 'absolute',
left: 0,
top: 0
}).appendTo(document.body);
$canvas.siblings().toggle();
$(window).click(function(){
@ -32,6 +36,16 @@
});
throwMessage('Screenshot created in '+ ((finishTime.getTime()-timer)) + " ms<br />",4000);
// test if canvas is read-able
try {
$canvas[0].toDataURL();
} catch(e) {
if ($canvas[0].nodeName.toLowerCase() === "canvas") {
// TODO, maybe add a bit less offensive way to present this, but still something that can easily be noticed
alert("Canvas is tainted, unable to read data");
}
}
};
html2canvas.Preload(this[0], options);