api(qr): make QR-Code error correction level adjustable

Lower default used error correction level from H to M.

Information:
https: //www.qrcode.com/en/about/error_correction.html
https: //blog.qrstuff.com/2011/12/14/qr-code-error-correction
Change-Id: I4849a340caeb4dfbc5933a90de4585ed8d932961

Author: andi34

api/print.php

@@ -82,7 +82,24 @@ function applyQR($sourceResource, $qrPath, $x, $y) {
                 $url = $config['qr']['url'];
             }
             include '../vendor/phpqrcode/lib/full/qrlib.php';
-            QRcode::png($url, $filename_codes, QR_ECLEVEL_H, $config['print']['qrSize']);
+            switch ($config['qr']['ecLevel']) {
+                case 'QR_ECLEVEL_L':
+                    $ecLevel = QR_ECLEVEL_L;
+                    break;
+                case 'QR_ECLEVEL_M':
+                    $ecLevel = QR_ECLEVEL_M;
+                    break;
+                case 'QR_ECLEVEL_Q':
+                    $ecLevel = QR_ECLEVEL_Q;
+                    break;
+                case 'QR_ECLEVEL_H':
+                    $ecLevel = QR_ECLEVEL_H;
+                    break;
+                default:
+                    $ecLevel = QR_ECLEVEL_M;
+                    break;
+            }
+            QRcode::png($url, $filename_codes, $ecLevel, $config['print']['qrSize']);
             if ($rotateQr) {
                 $image = imagecreatefrompng($filename_codes);
                 $resultRotated = imagerotate($image, 90, 0);

api/qrcode.php

@@ -11,4 +11,22 @@
 }
 
 include '../vendor/phpqrcode/lib/full/qrlib.php';
-QRcode::png($url, false, QR_ECLEVEL_H, 10);
+switch ($config['qr']['ecLevel']) {
+    case 'QR_ECLEVEL_L':
+        $ecLevel = QR_ECLEVEL_L;
+        break;
+    case 'QR_ECLEVEL_M':
+        $ecLevel = QR_ECLEVEL_M;
+        break;
+    case 'QR_ECLEVEL_Q':
+        $ecLevel = QR_ECLEVEL_Q;
+        break;
+    case 'QR_ECLEVEL_H':
+        $ecLevel = QR_ECLEVEL_H;
+        break;
+    default:
+        $ecLevel = QR_ECLEVEL_M;
+        break;
+}
+
+QRcode::png($url, false, $ecLevel, 8);

config/config.inc.php

@@ -211,6 +211,7 @@
 
 // Q R  -  C O D E
 $config['qr']['enabled'] = true;
+$config['qr']['ecLevel'] = 'QR_ECLEVEL_M';
 $config['qr']['url'] = NULL;
 $config['qr']['append_filename'] = true;
 $config['qr']['custom_text'] = false;

lib/configsetup.inc.php

@@ -1309,6 +1309,18 @@
             'name' => 'qr[enabled]',
             'value' => $config['qr']['enabled'],
         ],
+        'qr_ecLevel' => [
+            'type' => 'select',
+            'name' => 'qr[ecLevel]',
+            'placeholder' => $defaultConfig['qr']['ecLevel'],
+            'options' => [
+                'QR_ECLEVEL_L' => 'L - smallest',
+                'QR_ECLEVEL_M' => 'M',
+                'QR_ECLEVEL_Q' => 'Q',
+                'QR_ECLEVEL_H' => 'H - best',
+            ],
+            'value' => $config['qr']['ecLevel'],
+        ],
         'qr_url' => [
             'view' => 'expert',
             'type' => 'input',

resources/lang/en.json

@@ -416,6 +416,7 @@
   "manual:print:textonprint_rotation": "Enter a value which is used as degrees the text gets rotated at print.",
   "manual:qr:qr_append_filename": "If enabled, the image name will be added to the QR URL.",
   "manual:qr:qr_custom_text": "If enabled, own defined help text will be visible below the QR Code.",
+  "manual:qr:qr_ecLevel": "QR Code error correction capability to restore data:</br> Level L – up to 7%</br> Level M – up to 15%</br> Level Q – up to 25%</br> Level H – up to 30%</br>",
   "manual:qr:qr_enabled": "If enabled, a QR-Button is visible on the result screen and inside gallery. User can download a picture while scanning the QR-Code. If you're accessing Photobooth via \"localhost\", \"127.0.0.1\" or if you have Photobooth installed inside a subfolder, please define IP address of the Photobooth web server to make the QR-Code working. <p>Example if Photobooth can be accessed directly: <code>192.168.0.50</code>.</p><p>Example if Photobooth is installed inside a subfolder: <code>192.168.0.50/photobooth</code>.</p>",
   "manual:qr:qr_text": "Define own help text which will be visible below the QR Code.",
   "manual:qr:qr_url": "Define a URL to point at via QR Code.",
@@ -548,6 +549,7 @@
   "qr": "QR Code",
   "qr:qr_append_filename": "Append filename to URL",
   "qr:qr_custom_text": "Use own help text on QR",
+  "qr:qr_ecLevel": "QR-Code error correction",
   "qr:qr_enabled": "Use QR Codes",
   "qr:qr_text": "Own help text",
   "qr:qr_url": "URL for QR Code",