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126 lines
3.7 KiB
C++
126 lines
3.7 KiB
C++
/*
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Copyright © 2015-2018 by The qTox Project Contributors
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This file is part of qTox, a Qt-based graphical interface for Tox.
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qTox is libre software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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qTox is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with qTox. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "qrwidget.h"
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#include <QBuffer>
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#include <QDebug>
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#include <QImage>
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#include <QPainter>
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#include <qrencode.h>
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#ifdef Q_OS_WIN32
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#include <errno.h>
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#else
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#include <sys/errno.h>
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#endif
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/**
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* @file qrwidget.cpp
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* @link https://stackoverflow.com/questions/21400254/how-to-draw-a-qr-code-with-qt-in-native-c-c
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*/
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QRWidget::QRWidget(QWidget* parent)
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: QWidget(parent)
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, data("0")
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// Note: The encoding fails with empty string so I just default to something else.
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// Use the setQRData() call to change this.
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{
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// size of the qimage might be problematic in the future, but it works for me
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size.setWidth(480);
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size.setHeight(480);
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image = new QImage(size, QImage::Format_RGB32);
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}
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QRWidget::~QRWidget()
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{
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delete image;
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}
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void QRWidget::setQRData(const QString& data)
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{
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this->data = data;
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paintImage();
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}
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QImage* QRWidget::getImage()
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{
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return image;
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}
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/**
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* @brief QRWidget::saveImage
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* @param path Full path to the file with extension.
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* @return indicate if saving was successful.
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*/
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bool QRWidget::saveImage(QString path)
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{
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return image
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->save(path, 0,
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75); // 0 - image format same as file extension, 75-quality, png file is ~6.3kb
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}
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// http://stackoverflow.com/questions/21400254/how-to-draw-a-qr-code-with-qt-in-native-c-c
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void QRWidget::paintImage()
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{
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QPainter painter(image);
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// NOTE: I have hardcoded some parameters here that would make more sense as variables.
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// ECLEVEL_M is much faster recognizable by barcodescanner any any other type
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// https://fukuchi.org/works/qrencode/manual/qrencode_8h.html#a4cebc3c670efe1b8866b14c42737fc8f
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// any mode other than QR_MODE_8 or QR_MODE_KANJI results in EINVAL. First 1 is version, second
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// is case sensitivity
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const std::string dataString = data.toStdString();
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QRcode* qr = QRcode_encodeString(dataString.c_str(), 1, QR_ECLEVEL_M, QR_MODE_8, 1);
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if (qr != nullptr) {
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QColor fg("black");
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QColor bg("white");
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painter.setBrush(bg);
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painter.setPen(Qt::NoPen);
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painter.drawRect(0, 0, size.width(), size.height());
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painter.setBrush(fg);
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const int s = qr->width > 0 ? qr->width : 1;
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const double w = width();
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const double h = height();
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const double aspect = w / h;
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const double scale = ((aspect > 1.0) ? h : w) / s;
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for (int y = 0; y < s; ++y) {
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const int yy = y * s;
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for (int x = 0; x < s; ++x) {
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const int xx = yy + x;
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const unsigned char b = qr->data[xx];
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if (b & 0x01) {
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const double rx1 = x * scale, ry1 = y * scale;
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QRectF r(rx1, ry1, scale, scale);
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painter.drawRects(&r, 1);
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}
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}
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}
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QRcode_free(qr);
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} else {
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QColor error("red");
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painter.setBrush(error);
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painter.drawRect(0, 0, width(), height());
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qDebug() << "QR FAIL: " << strerror(errno);
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}
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qr = nullptr;
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}
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