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src/QrCodeGenerator.h

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+/*
+ * 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.
+ */
+
+#pragma once
+
+#include <QImage>
+#include <QObject>
+#include <QString>
+
+#include "qrcodegen/qrcodegen.h"
+
+/**
+ * @class QrCodeGenerator
+ * @brief The QrCodeGenerator class is a simple C++ class that uses the qrcodegen library to
+ *        generate QR codes from QStrings in Qt applications.
+ */
+class QrCodeGenerator : public QObject {
+public:
+  /**
+   * @brief Constructs a QrCodeGenerator object.
+   * @param parent The parent QObject.
+   */
+  explicit QrCodeGenerator(QObject *parent = nullptr);
+
+  /**
+   * @brief Generates a QR code from the given data and error correction level.
+   * @param data The QString containing the data to encode in the QR code.
+   * @param size The desired width/height of the generated image (default: 500).
+   * @param borderSize The desired border width of the generated image (default: 1).
+   * @param errorCorrection The desired error correction level (default:
+   * qrcodegen::QrCode::Ecc::MEDIUM).
+   *
+   * @return QImage containing the generated QR code.
+   */
+  QImage generateQr(const QString &data, const quint16 size = 500, const quint16 borderSize = 1,
+                    qrcodegen::QrCode::Ecc errorCorrection = qrcodegen::QrCode::Ecc::MEDIUM);
+
+private:
+  /**
+   * @brief Converts a qrcodegen::QrCode object to a SVG image.
+   * @param qrCode The qrcodegen::QrCode object to convert.
+   * @param borderSize The desired border width of the generated image (default: 1).
+   *
+   * @return QImage containing the QR code.
+   */
+  QString toSvgString(const qrcodegen::QrCode &qr, quint16 border) const;
+
+  /**
+   * @brief Converts a qrcodegen::QrCode object to a QImage.
+   * @param qrCode The qrcodegen::QrCode object to convert.
+   * @param size The desired width/height of the generated image.
+   * @param borderSize The desired border width of the generated image.
+   *
+   * @return QImage containing the QR code.
+   */
+  QImage qrCodeToImage(const qrcodegen::QrCode &qrCode, quint16 border, const quint16 size) const;
+};