Bugfix: Fix PNG transparency of rack U height labels.

functions/classes/class.Rackspace.php

@@ -470,10 +470,15 @@ class RackDrawer extends Common_functions {
             imagecopy($this->template, $unit, 0, $y, 0, 0, $this->rackXSize, $this->unitYSize);
             $text = ($this->rack->getOrientation()) ? $i + 1 : $this->rack->getSpace() - $i;
             $textBox = imagettfbbox(12, 0, dirname(__FILE__)."/../../css/fonts/MesloLGS-Regular.ttf", $text);
+
+            // disable transparency for U labels
+            imagealphablending($this->template, true);
             imagettftext($this->template, 12, 0,
                 $this->rackInsideXOffset - 4 - abs($textBox[2] - $textBox[0]),
                 $y + abs($textBox[1] - $textBox[7]) + round(($this->unitYSize - ($textBox[1] - $textBox[7])) / 2),
                 $textColor, dirname(__FILE__)."/../../css/fonts/MesloLGS-Regular.ttf", $text);
+            imagealphablending($this->template, false);
+
             $y += $this->unitYSize;
         }
         imagecopy($this->template, $bottom, 0, $y, 0, 0, $this->rackXSize, $this->bottomYSize);