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Add some padding to the generated QR-Code (#483)

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When using a dark theme, the QR-Code isn't recognized by other devices,
since the background has a similar color as the QR-Code itself.
This commit fixes that by adding a small white padding to the image.
This commit is contained in:
Alireza |S.N|
2023-03-31 13:25:07 +03:30
committed by GitHub
parent dc6b2c4e1e
commit a88712aa97
1 changed files with 5 additions and 2 deletions
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7
ui/mainwindow.cpp
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@@ -1129,16 +1129,19 @@ void MainWindow::display_qr_link(bool nkrFormat) {
void refresh(bool is_nk) { void refresh(bool is_nk) {
auto link_display = is_nk ? link_nk : link; auto link_display = is_nk ? link_nk : link;
l2->setPlainText(link_display); l2->setPlainText(link_display);
constexpr qint32 qr_padding = 2;
// //
try { try {
qrcodegen::QrCode qr = qrcodegen::QrCode::encodeText(link_display.toUtf8().data(), qrcodegen::QrCode::Ecc::MEDIUM); qrcodegen::QrCode qr = qrcodegen::QrCode::encodeText(link_display.toUtf8().data(), qrcodegen::QrCode::Ecc::MEDIUM);
qint32 sz = qr.getSize(); qint32 sz = qr.getSize();
im = QImage(sz, sz, QImage::Format_RGB32); im = QImage(sz + qr_padding * 2, sz + qr_padding * 2, QImage::Format_RGB32);
QRgb black = qRgb(0, 0, 0); QRgb black = qRgb(0, 0, 0);
QRgb white = qRgb(255, 255, 255); QRgb white = qRgb(255, 255, 255);
im.fill(white);
for (int y = 0; y < sz; y++) for (int y = 0; y < sz; y++)
for (int x = 0; x < sz; x++) for (int x = 0; x < sz; x++)
im.setPixel(x, y, qr.getModule(x, y) ? black : white); if (qr.getModule(x, y))
im.setPixel(x + qr_padding, y + qr_padding, black);
show_qr(size()); show_qr(size());
} catch (const std::exception &ex) { } catch (const std::exception &ex) {
QMessageBox::warning(nullptr, "error", ex.what()); QMessageBox::warning(nullptr, "error", ex.what());