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Simplify calculation of total in getAverageColor().

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This commit is contained in:
Jürg Lehni 2011-03-02 08:53:38 +01:00
parent 98de3cbb2a
commit 8cb3efb28e
1 changed files with 3 additions and 2 deletions
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5
src/item/Raster.js
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@ -205,14 +205,15 @@ Raster = Item.extend({
var channels = [0, 0, 0];
var total = 0;
for (var i = 0, l = pixels.length; i < l; i += 4) {
var alpha = pixels[i + 3] / 255;
var alpha = pixels[i + 3];
total += alpha;
alpha /= 255;
channels[0] += pixels[i] * alpha;
channels[1] += pixels[i + 1] * alpha;
channels[2] += pixels[i + 2] * alpha;
}
for (var i = 0; i < 3; i++)
channels[i] /= total * 255;
channels[i] /= total;
return total ? Color.read(channels) : null;
}