Add Center Logo Feature To QrCode Library, Hope It Is Useful :)

composer.json

@@ -16,6 +16,9 @@
         "php": ">=5.3.0",
         "ext-gd": "*"
     },
+    "require-dev" : {
+        "phpunit/phpunit" : "~5.3"
+    },
     "autoload": {
         "psr-4": {
             "Endroid\\QrCode\\": "src/"

src/QrCode.php

@@ -79,6 +79,11 @@ class QrCode
     /** @const int Vertical label alignment to the bottom */
     const LABEL_VALIGN_BOTTOM = 4;
 
+    /** @var string */
+    protected $logo = NULL;
+
+    protected $logo_size = 48;
+
     /** @var string */
     protected $text = '';
 
@@ -370,6 +375,37 @@ public function getPath()
         return $this->path;
     }
 
+    /**
+     * Set logo in QR Code.
+     *
+     * @param string $logo Logo Path
+     * @throws Exceptions\DataDoesntExistsException
+     * @return QrCode
+     */
+    public function setLogo($logo)
+    {
+        if(!file_exists($logo)){
+            throw new DataDoesntExistsException("$logo file does not exist");
+        }
+
+        $this->logo = $logo;
+        return $this;
+    }
+
+    /**
+     * Set logo size in QR Code(default 48).
+     *
+     * @param int $logo_size Logo Size
+     *
+     * @return QrCode
+     */
+    public function setLogoSize($logo_size)
+    {
+        $this->logo_size = $logo_size;
+
+        return $this;
+    }
+
     /**
      * Set text to hide in QR Code.
      *
@@ -1496,6 +1532,24 @@ public function create()
             }
         }
 
+        if(!empty($this->logo))
+        {
+            $logo_image = call_user_func('imagecreatefrom'.$this->image_type, $this->logo);
+            if(!$logo_image){
+                throw new ImageFunctionFailedException('imagecreatefrom'.$this->image_type . ' ' . $this->logo . 'failed' );
+            }
+            $src_w = imagesx($logo_image);
+            $src_h = imagesy($logo_image);
+
+            $dst_x = ($image_width - $this->logo_size) / 2;
+            $dst_y = ($this->size + $this->padding * 2 - $this->logo_size) / 2;
+
+            $successful = imagecopyresampled($output_image, $logo_image, $dst_x, $dst_y, 0, 0, $this->logo_size, $this->logo_size, $src_w, $src_h);
+            if(!$successful){
+                throw new ImageFunctionFailedException('add logo [image'.$this->format.'] failed.');
+            }
+            imagedestroy($logo_image);
+        }
         $this->image = $output_image;
     }
 }

tests/QrCodeTest.php

@@ -46,6 +46,20 @@ public function testGetImageString()
         $this->assertTrue(is_string($imageString));
     }
 
+    /**
+     * Tests if a valid image string is returned.
+     *
+     * @throws ImageFunctionFailedException
+     * @throws ImageFunctionUnknownException
+     */
+    public function testGetQrCodeWithLogoString()
+    {
+        $qrCode = $this->createQrCodeWithLogo();
+        $imageString = $qrCode->get('png');
+
+        $this->assertTrue(is_string($imageString));
+    }
+
     /**
      * Returns a QR code.
      */
@@ -71,4 +85,15 @@ protected function createQrCode()
 
         return $qrCode;
     }
+
+    protected function createQrCodeWithLogo()
+    {
+        $qrCode = new QrCode();
+        $qrCode->setText('Life is too short to be generating QR codes')
+        ->setSize(300)
+        ->setLogo(dirname(__DIR__) . '/assets/image/logo.png')
+        ->setLogoSize(60);
+
+        return $qrCode;
+    }
 }