Add logo option to Endroid's provider

closes #56

lib/Providers/Qr/EndroidQrCodeProvider.php

@@ -10,6 +10,8 @@ class EndroidQrCodeProvider implements IQRCodeProvider
     public $color;
     public $margin;
     public $errorcorrectionlevel;
+    protected $logoPath;
+    protected $logoSize;
 
     public function __construct($bgcolor = 'ffffff', $color = '000000', $margin = 0, $errorcorrectionlevel = 'H')
     {
@@ -19,6 +21,17 @@ class EndroidQrCodeProvider implements IQRCodeProvider
         $this->errorcorrectionlevel = $this->handleErrorCorrectionLevel($errorcorrectionlevel);
     }
 
+    /**
+     * Adds an image to the middle of the QR Code.
+     * @param string $path Path to an image file
+     * @param array|int $size Just the width, or [width, height]
+     */
+    public function setLogo($path, $size = null)
+    {
+        $this->logoPath = $path;
+        $this->logoSize = (array)$size;
+    }
+
     public function getMimeType()
     {
         return 'image/png';
@@ -34,6 +47,13 @@ class EndroidQrCodeProvider implements IQRCodeProvider
         $qrCode->setBackgroundColor($this->bgcolor);
         $qrCode->setForegroundColor($this->color);
 
+        if ($this->logoPath) {
+            $qrCode->setLogoPath($this->logoPath);
+            if ($this->logoSize) {
+                $qrCode->setLogoSize($this->logoSize[0], $this->logoSize[1]);
+            }
+        }
+
         return $qrCode->writeString();
     }