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feat(ui/MSALoginDialog): use libqrencode for qr codes

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`qrcodegen` isn't available in most repositories, package discovery
scripts for it are maintained in a different repository, and they are
bugged for Windows at least. This basically forces us into vendoring it,
which isn't cool; libqrencode seems like viable alternative used by many
more apps

Signed-off-by: Seth Flynn <getchoo@tuta.io>
This commit is contained in:
Seth Flynn
2025-07-09 11:31:22 -04:00
parent c5c12ae8ce
commit 3b9e020115
12 changed files with 66 additions and 75 deletions
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43
launcher/ui/dialogs/MSALoginDialog.cpp
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@@ -50,7 +50,7 @@
#include <QUrl>
#include <QtWidgets/QPushButton>
#include "qrcodegen.hpp"
#include "qrencode.h"
MSALoginDialog::MSALoginDialog(QWidget* parent) : QDialog(parent), ui(new Ui::MSALoginDialog)
{
@@ -146,27 +146,32 @@ void MSALoginDialog::authorizeWithBrowser(const QUrl& url)
m_url = url;
}
// https://stackoverflow.com/questions/21400254/how-to-draw-a-qr-code-with-qt-in-native-c-c
void paintQR(QPainter& painter, const QSize sz, const QString& data, QColor fg)
void paintQR(QPainter& painter, const QSize canvasSize, const QString& data, QColor fg)
{
// 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(data.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);
// 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).
const auto* qr = QRcode_encodeString(data.toUtf8().constData(), 0, QRecLevel::QR_ECLEVEL_M, QRencodeMode::QR_MODE_8, 1);
if (!qr) {
qWarning() << "Unable to encode" << data << "as QR code";
return;
}
painter.setPen(Qt::NoPen);
painter.setBrush(fg);
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, ry1 = (y + 1) * scale;
QRectF r(rx1, ry1, scale, scale);
// Make sure the QR code fits in the canvas with some padding
const auto qrSize = qr->width;
const auto canvasWidth = canvasSize.width();
const auto canvasHeight = canvasSize.height();
const auto scale = 0.8 * std::min(canvasWidth / qrSize, canvasHeight / qrSize);
// Find an offset to center it in the canvas
const auto offsetX = (canvasWidth - qrSize * scale) / 2;
const auto offsetY = (canvasHeight - qrSize * scale) / 2;
for (int y = 0; y < qrSize; y++) {
for (int x = 0; x < qrSize; x++) {
auto shouldFillIn = qr->data[y * qrSize + x] & 1;
if (shouldFillIn) {
QRectF r(offsetX + x * scale, offsetY + y * scale, scale, scale);
painter.drawRects(&r, 1);
}
}