Create Sharpen plugin

src/PHPThumb/GD.php

@@ -935,6 +935,14 @@ public function save($fileName, $format = null)
             }
         }
 
+        //Execute any plugins
+        if ($this->plugins) {
+            foreach ($this->plugins as $plugin) {
+                /* @var $plugin \PHPThumb\PluginInterface */
+                $plugin->execute($this);
+            }
+        }
+
         // When the interlace option equals true or false call imageinterlace else leave it to default
         if ($this->options['interlace'] === true) {
             imageinterlace($this->oldImage, 1);

src/PHPThumb/Plugins/Sharpen.php

@@ -0,0 +1,53 @@
+<?php
+/**
+ * Sharpen Lib Plugin Definition File
+ * 
+ * This file contains the plugin definition for the Sharpen Lib for PHP Thumb
+ * 
+ * PHP Version 5 with GD 2.0+
+ * PhpThumb : PHP Thumb Library <http://phpthumb.gxdlabs.com>
+ * Copyright (c) 2009, Ian Selby/Gen X Design
+ * 
+ * Author(s): Ian Selby <[email protected]>
+ * 
+ * Licensed under the MIT License
+ * Redistributions of files must retain the above copyright notice.
+ * 
+ * @author Ian Selby <[email protected]>
+ * @copyright Copyright (c) 2009 Gen X Design
+ * @link http://phpthumb.gxdlabs.com
+ * @license http://www.opensource.org/licenses/mit-license.php The MIT License
+ * @version 3.0
+ * @package PhpThumb
+ * @filesource
+ */
+
+
+namespace PHPThumb\Plugins;
+
+/**
+ * Sharpen Lib Plugin
+ * 
+ * This plugin allows you to create a sharpened version of your image
+ * @author Remi Heens <[email protected]>
+ * @package PhpThumb
+ * @subpackage Plugins
+ */
+class Sharpen implements \PHPThumb\PluginInterface
+{
+    public function execute($phpthumb)
+    {
+        // sharpen image
+        $sharpenMatrix = array (
+                        array (-1,-1,-1),
+                        array (-1,16,-1),
+                        array (-1,-1,-1),
+                        );
+
+        $divisor = 8;
+        $offset = 0;
+
+        imageconvolution ($phpthumb->getWorkingImage(), $sharpenMatrix, $divisor, $offset);
+
+    }
+}