Custom qrcode renderer to allow smooth resizing

src/mainwindow.cpp

@@ -701,38 +701,7 @@ void MainWindow::setupRecieveTab() {
         }
 
         ui->txtRecieve->setPlainText(addr);       
-        
-        QSize sz = ui->qrcodeDisplay->size();
-
-        QPixmap pm(sz);
-        pm.fill(Qt::white);
-        QPainter painter(&pm);
-        
-        // NOTE: At this point you will use the API to get the encoding and format you want, instead of my hardcoded stuff:
-        qrcodegen::QrCode qr = qrcodegen::QrCode::encodeText(addr.toUtf8().constData(), qrcodegen::QrCode::Ecc::LOW);
-        const int    s      = qr.getSize()>0?qr.getSize():1;
-        const double w      = sz.width();
-        const double h      = sz.height();
-        const double aspect = w/h;
-        const double size   = ((aspect>1.0)?h:w);
-        const double scale  = size/(s+2);
-		const double offset = (w - size) > 0 ? (w - size) / 2 : 0;
-        // NOTE: For performance reasons my implementation only draws the foreground parts in supplied color.
-        // It expects background to be prepared already (in white or whatever is preferred).
-        painter.setPen(Qt::NoPen);
-        painter.setBrush(QColor(Qt::black));
-        for(int y=0; y<s; y++) {
-            for(int x=0; x<s; x++) {
-                const int color=qr.getModule(x, y);  // 0 for white, 1 for black
-                if(0!=color) {
-                    const double rx1=(x+1)*scale+ offset, ry1=(y+1)*scale;
-                    QRectF r(rx1, ry1, scale, scale);
-                    painter.drawRects(&r,1);
-                }
-            }
-        }
-        
-        ui->qrcodeDisplay->setPixmap(pm);
+        ui->qrcodeDisplay->setAddress(addr);
     });    
 
 }