security-and-privacy/CanvasBlocker
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Added setting for minimal colors

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Fixes #162
This commit is contained in:
kkapsner 2017-12-11 12:47:43 +01:00
parent e128cba84a
commit 096db123d7
7 changed files with 70 additions and 2 deletions
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25
lib/colorStatistics.js
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@ -82,4 +82,29 @@
}
return statistic;
};
scope.hasMoreColors = function hasMoreColors(rawData, threshold, statistic){
if (statistic){
return statistic.numberOfColors > threshold;
}
else {
var colors = Object.create(null);
var count = 0;
for (var i = 0, l = rawData.length; i < l; i += 4){
var index = String.fromCharCode(
rawData[i + 0],
rawData[i + 1],
rawData[i + 2],
rawData[i + 3]
);
if (!Object.prototype.hasOwnProperty.call(colors, index)){
colors[index] = true;
count += 1;
if (count > threshold){
return true;
}
}
}
return count > threshold;
}
};
}());