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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
parent 994128d98a 6e69e10b2d
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($input) private function alpha2gd($input)
{ {
$range_input = range(1, 0, 1/127); $oldMin = 0;
$range_output = range(0, 127); $oldMax = 1;
foreach ($range_input as $key => $value) { $newMin = 127;
if ($value <= $input) { $newMax = 0;
return $range_output[$key];
}
}
return 127; return ceil(((($input- $oldMin) * ($newMax - $newMin)) / ($oldMax - $oldMin)) + $newMin);
} }
} }