Initial commit

2023-03-26 18:55:02 -05:00
parent d1b6b16e4b
commit f329b94888
15 changed files with 2243 additions and 0 deletions
@@ -0,0 +1,79 @@
+/*
+ * Copyright (c) 2023 Alex Spataru <https://github.com/alex-spataru>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "QrCodeGenerator.h"
+
+#include <sstream>
+#include <string>
+
+#include <QPainter>
+#include <QSvgRenderer>
+
+QrCodeGenerator::QrCodeGenerator(QObject *parent) : QObject(parent) {}
+
+QImage QrCodeGenerator::generateQr(const QString &data, const quint16 size,
+                                   const quint16 borderSize,
+                                   qrcodegen::QrCode::Ecc errorCorrection) {
+  QByteArray byteArray = data.toUtf8();
+  const qrcodegen::QrCode qrCode = qrcodegen::QrCode::encodeText(byteArray.constData(),
+                                                                 errorCorrection);
+  return qrCodeToImage(qrCode, borderSize, size);
+}
+
+QString QrCodeGenerator::toSvgString(const qrcodegen::QrCode &qr, quint16 border) const {
+  if (border > INT_MAX / 2 || border * 2 > INT_MAX - qr.getSize())
+    throw std::overflow_error("Border too large");
+
+  std::ostringstream sb;
+  sb << "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n";
+  sb << "<!DOCTYPE svg PUBLIC \"-//W3C//DTD SVG 1.1//EN\" "
+        "\"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd\">\n";
+  sb << "<svg xmlns=\"http://www.w3.org/2000/svg\" version=\"1.1\" viewBox=\"0 0 ";
+  sb << (qr.getSize() + border * 2) << " " << (qr.getSize() + border * 2)
+     << "\" stroke=\"none\">\n";
+  sb << "\t<rect width=\"100%\" height=\"100%\" fill=\"#FFFFFF\"/>\n";
+  sb << "\t<path d=\"";
+  for (int y = 0; y < qr.getSize(); y++) {
+    for (int x = 0; x < qr.getSize(); x++) {
+      if (qr.getModule(x, y)) {
+        if (x != 0 || y != 0)
+          sb << " ";
+        sb << "M" << (x + border) << "," << (y + border) << "h1v1h-1z";
+      }
+    }
+  }
+  sb << "\" fill=\"#000000\"/>\n";
+  sb << "</svg>\n";
+
+  return QString::fromStdString(sb.str());
+}
+
+QImage QrCodeGenerator::qrCodeToImage(const qrcodegen::QrCode &qrCode, quint16 border,
+                                      const quint16 size) const {
+  auto svg = toSvgString(qrCode, border);
+  QSvgRenderer render(svg.toUtf8());
+  QImage image(size, size, QImage::Format_Mono);
+  image.fill(Qt::white);
+  QPainter painter(&image);
+  render.render(&painter);
+  return image;
+}