Merge pull request #98 from AndyDune/master

Add filters callback before save image.

Author: adityapatadia

README.md

@@ -309,6 +309,37 @@ try{
 }
 ```
 
+Filters
+--------
+ 
+You can apply special effects for new image like blur or add banner. 
+
+```php
+$image = new ImageResize('image.jpg');
+
+// Add blure
+$image->addFIlter(function ($imageDesc) {
+    imagefilter($imageDesc, IMG_FILTER_GAUSSIAN_BLUR);
+});
+
+// Add banner on bottom left corner
+$image18Plus = 'banner.png'
+$image->addFIlter(function ($imageDesc) use ($image18Plus) {
+    $logo = imagecreatefrompng($image18Plus);
+    $logo_width = imagesx($logo);
+    $logo_height = imagesy($logo);
+    $image_width = imagesx($imageDesc);
+    $image_height = imagesy($imageDesc);
+    $image_x = $image_width - $logo_width - 10;
+    $image_y = $image_height - $logo_height - 10;
+    imagecopy($imageDesc, $logo, $image_x, $image_y, 0, 0, $logo_width, $logo_height);
+});
+
+```
+ 
+Both functions will be used in the order in which they were added.
+ 
+ 
 API Doc
 -------
 

lib/ImageResize.php

@@ -43,6 +43,9 @@ class ImageResize
 
     protected $source_info;
 
+
+    protected $filters = [];
+
     /**
      * Create instance from a strng
      *
@@ -59,6 +62,31 @@ public static function createFromString($image_data)
         return $resize;
     }
 
+
+    /**
+     * Add filter function for use right before save image to file.
+     *
+     * @param callable $filter
+     * @return $this
+     */
+    public function addFilter(callable $filter)
+    {
+        $this->filters[] = $filter;
+        return $this;
+    }
+
+    /**
+     * Apply filters.
+     *
+     * @param $image resource an image resource identifier
+     */
+    protected function applyFilter($image)
+    {
+        foreach ($this->filters as $function) {
+            $function($image);
+        }
+    }
+
     /**
      * Loads image source and its properties to the instanciated object
      *
@@ -235,6 +263,9 @@ public function save($filename, $image_type = null, $quality = null, $permission
             $this->source_h
         );
 
+
+        $this->applyFilter($dest_image);
+
         switch ($image_type) {
         case IMAGETYPE_GIF:
             imagegif($dest_image, $filename);