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Simplify getAverageColor() loop.

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This commit is contained in:
Jürg Lehni 2011-03-02 08:52:39 +01:00
parent 8c96d91400
commit 98de3cbb2a
1 changed files with 5 additions and 6 deletions
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11
src/item/Raster.js
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@ -204,13 +204,12 @@ Raster = Item.extend({
function getAverageColor(pixels) {
var channels = [0, 0, 0];
var total = 0;
for (var i = 0, l = pixels.length / 4; i < l; i++) {
var offset = i * 4;
var alpha = pixels[offset + 3] / 255;
for (var i = 0, l = pixels.length; i < l; i += 4) {
var alpha = pixels[i + 3] / 255;
total += alpha;
channels[0] += pixels[offset] * alpha;
channels[1] += pixels[offset + 1] * alpha;
channels[2] += pixels[offset + 2] * alpha;
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;