Add border to generated QR codes

1 files changed, 14 insertions, 5 deletions

diff --git a/src/libwalletqt/QRCodeImageProvider.cpp b/src/libwalletqt/QRCodeImageProvider.cpp
index 6d99b35c..0054bee5 100644
--- a/src/libwalletqt/QRCodeImageProvider.cpp
+++ b/src/libwalletqt/QRCodeImageProvider.cpp
@@ -7,12 +7,21 @@ QImage QRCodeImageProvider::genQrImage(const QString &id, QSize *size)
   using namespace qrcodegen;
 
   QrCode qrcode = QrCode::encodeText(id.toStdString().c_str(), QrCode::Ecc::MEDIUM);
-  QImage img = QImage(qrcode.size, qrcode.size, QImage::Format_Mono);
-  for (int y = 0; y < qrcode.size; ++y)
-    for (int x = 0; x < qrcode.size; ++x)
-      img.setPixel(x, y, !qrcode.getModule(x, y)); // 1 is black, not "255/white"
+  unsigned int black = 0;
+  unsigned int white = 1;
+  unsigned int borderSize = 4;
+  unsigned int imageSize = qrcode.size + (2 * borderSize);
+  QImage img = QImage(imageSize, imageSize, QImage::Format_Mono);
+
+  for (unsigned int y = 0; y < imageSize; ++y)
+    for (unsigned int x = 0; x < imageSize; ++x)
+      if ((x < borderSize) || (x >= imageSize - borderSize) || (y < borderSize) || (y >= imageSize - borderSize))
+        img.setPixel(x, y, white);
+      else
+        img.setPixel(x, y, qrcode.getModule(x - borderSize, y - borderSize) ? black : white);
   if (size)
-    *size = QSize(qrcode.size, qrcode.size);
+    *size = QSize(imageSize, imageSize);
+
   return img;
 }