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Merge pull request #220 from jwpage/faster_alpha2gd

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Rewrite Gd\Color::alpha2gd for improved performance
This commit is contained in:
Oliver Vogel 2014-08-31 11:30:21 +02:00
commit 45e1be89c5
1 changed files with 5 additions and 8 deletions
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13
src/Intervention/Image/Gd/Color.php
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@ -215,15 +215,12 @@ class Color extends AbstractColor
*/
private function alpha2gd($input)
{
$range_input = range(1, 0, 1/127);
$range_output = range(0, 127);
$oldMin = 0;
$oldMax = 1;
foreach ($range_input as $key => $value) {
if ($value <= $input) {
return $range_output[$key];
}
}
$newMin = 127;
$newMax = 0;
return 127;
return ceil(((($input- $oldMin) * ($newMax - $newMin)) / ($oldMax - $oldMin)) + $newMin);
}
}