From 1c2a1bac0ad6901868c1a4003c7cbddcdf46a29b Mon Sep 17 00:00:00 2001
From: Francesco 'makevoid' Canessa <makevoid@gmail.com>
Date: Thu, 3 Mar 2016 10:54:31 +0000
Subject: Add address label to request payment QR Code (QT)

In the Receive 'Tab' of the QT wallet, when 'Show'ing a previously requested payment, add a label underneath the QR Code showing the bitcoin address where the funds will go to.

This way the user can be sure that the QR code scanner app the user using is reading the correct bitcoin address, preventing funds to be stolen.

Includes fix for HiDPI screens by @jonasschnelli.
---
 src/qt/receiverequestdialog.cpp | 22 +++++++++++++++++-----
 1 file changed, 17 insertions(+), 5 deletions(-)

(limited to 'src/qt/receiverequestdialog.cpp')

diff --git a/src/qt/receiverequestdialog.cpp b/src/qt/receiverequestdialog.cpp
index a1e9156ee..b13ea3df7 100644
--- a/src/qt/receiverequestdialog.cpp
+++ b/src/qt/receiverequestdialog.cpp
@@ -45,7 +45,7 @@ QImage QRImageWidget::exportImage()
 {
     if(!pixmap())
         return QImage();
-    return pixmap()->toImage().scaled(EXPORT_IMAGE_SIZE, EXPORT_IMAGE_SIZE);
+    return pixmap()->toImage();
 }
 
 void QRImageWidget::mousePressEvent(QMouseEvent *event)
@@ -166,20 +166,32 @@ void ReceiveRequestDialog::update()
                 ui->lblQRCode->setText(tr("Error encoding URI into QR Code."));
                 return;
             }
-            QImage myImage = QImage(code->width + 8, code->width + 8, QImage::Format_RGB32);
-            myImage.fill(0xffffff);
+            QImage qrImage = QImage(code->width + 8, code->width + 8, QImage::Format_RGB32);
+            qrImage.fill(0xffffff);
             unsigned char *p = code->data;
             for (int y = 0; y < code->width; y++)
             {
                 for (int x = 0; x < code->width; x++)
                 {
-                    myImage.setPixel(x + 4, y + 4, ((*p & 1) ? 0x0 : 0xffffff));
+                    qrImage.setPixel(x + 4, y + 4, ((*p & 1) ? 0x0 : 0xffffff));
                     p++;
                 }
             }
             QRcode_free(code);
 
-            ui->lblQRCode->setPixmap(QPixmap::fromImage(myImage).scaled(300, 300));
+            QImage qrAddrImage = QImage(QR_IMAGE_SIZE, QR_IMAGE_SIZE+20, QImage::Format_RGB32);
+            qrAddrImage.fill(0xffffff);
+            QPainter painter(&qrAddrImage);
+            painter.drawImage(0, 0, qrImage.scaled(QR_IMAGE_SIZE, QR_IMAGE_SIZE));
+            QFont font = GUIUtil::fixedPitchFont();
+            font.setPixelSize(12);
+            painter.setFont(font);
+            QRect paddedRect = qrAddrImage.rect();
+            paddedRect.setHeight(QR_IMAGE_SIZE+12);
+            painter.drawText(paddedRect, Qt::AlignBottom|Qt::AlignCenter, info.address);
+            painter.end();
+
+            ui->lblQRCode->setPixmap(QPixmap::fromImage(qrAddrImage));
             ui->btnSaveAs->setEnabled(true);
         }
     }
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