fixed issue when cloning Image objects

src/Intervention/Image/AbstractDriver.php

@@ -43,6 +43,16 @@ abstract class AbstractDriver
      */
     abstract protected function coreAvailable();
 
+    /**
+     * Returns clone of given core
+     *
+     * @return mixed
+     */
+    public function cloneCore($core)
+    {
+        return clone $core;
+    }
+
     /**
      * Initiates new image from given input
      *

src/Intervention/Image/Gd/Driver.php

@@ -66,4 +66,22 @@ class Driver extends \Intervention\Image\AbstractDriver
     {
         return (extension_loaded('gd') && function_exists('gd_info'));
     }
+
+    /**
+     * Returns clone of given core
+     *
+     * @return mixed
+     */
+    public function cloneCore($core)
+    {
+        $width = imagesx($core);
+        $height = imagesy($core);
+        $clone = imagecreatetruecolor($width, $height);
+        imagealphablending($clone, false);
+        imagesavealpha($clone, true);
+        
+        imagecopy($clone, $core, 0, 0, 0, 0, $width, $height);
+
+        return $clone;
+    }
 }

src/Intervention/Image/Image.php

@@ -262,4 +262,12 @@ class Image extends File
     {
         return $this->encoded;
     }
+
+    /**
+     * Cloning an image
+     */
+    public function __clone()
+    {
+        $this->core = $this->driver->cloneCore($this->core);
+    }
 }

tests/GdSystemTest.php

@@ -1482,6 +1482,20 @@ class GdSystemTest extends PHPUnit_Framework_TestCase
         $this->assertColorAtPosition('#939393', $img, 35, 35);
     }
 
+    public function testCloneImageObject()
+    {
+        $img = $this->manager()->make('tests/images/trim.png');
+        $cln = clone $img;
+
+        // destroy original
+        $img->destroy();
+        unset($img);
+
+        // clone should be still intact
+        $this->assertInstanceOf('Intervention\Image\Image', $cln);
+        $this->assertInternalType('resource', $cln->getCore());
+    }
+
     private function assertColorAtPosition($color, $img, $x, $y)
     {
         $pick = $img->pickColor($x, $y, 'hex');

tests/ImagickSystemTest.php

@@ -1463,6 +1463,20 @@ class ImagickSystemTest extends PHPUnit_Framework_TestCase
         $this->assertInstanceOf('Intervention\Image\Image', $img);
     }
 
+    public function testCloneImageObject()
+    {
+        $img = $this->manager()->make('tests/images/trim.png');
+        $cln = clone $img;
+
+        // destroy original
+        $img->destroy();
+        unset($img);
+
+        // clone should be still intact
+        $this->assertInstanceOf('Intervention\Image\Image', $cln);
+        $this->assertInstanceOf('Imagick', $cln->getCore());
+    }
+
     private function assertColorAtPosition($color, $img, $x, $y)
     {
         $pick = $img->pickColor($x, $y, 'hex');