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