Add method to allocate background

Author: natanfelles

phpmd.xml

@@ -1,9 +1,7 @@
 <?xml version="1.0"?>
 <ruleset name="Mess Detector">
     <!-- cleancode -->
-    <rule ref="rulesets/cleancode.xml">
-        <exclude name="ElseExpression"/>
-    </rule>
+    <rule ref="rulesets/cleancode.xml"/>
     <!-- codesize -->
     <rule ref="rulesets/codesize.xml/TooManyPublicMethods">
         <properties>

src/Image.php

@@ -539,13 +539,7 @@ public function opacity(int $opacity = 100) : static
      */
     public function rotate(float $angle) : static
     {
-        if ($this->hasAlpha()) {
-            \imagealphablending($this->instance, false);
-            \imagesavealpha($this->instance, true);
-            $background = \imagecolorallocatealpha($this->instance, 0, 0, 0, 127);
-        } else {
-            $background = \imagecolorallocate($this->instance, 255, 255, 255);
-        }
+        $background = $this->allocateBackground();
         if ($background === false) {
             throw new RuntimeException('Image could not allocate a color');
         }
@@ -557,6 +551,16 @@ public function rotate(float $angle) : static
         return $this;
     }
 
+    protected function allocateBackground() : false | int
+    {
+        if ($this->hasAlpha()) {
+            \imagealphablending($this->instance, false);
+            \imagesavealpha($this->instance, true);
+            return \imagecolorallocatealpha($this->instance, 0, 0, 0, 127);
+        }
+        return \imagecolorallocate($this->instance, 255, 255, 255);
+    }
+
     public function hasAlpha() : bool
     {
         return \in_array(