mirror of https://github.com/qTox/qTox.git
Dubslow
11 years ago
8 changed files with 243 additions and 21 deletions
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#include "qrwidget.h" |
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#include <QPainter> |
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#include <QDebug> |
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#include <QBuffer> |
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#include <QImage> |
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#include "qrencode.h" |
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QRWidget::QRWidget(QWidget *parent) : QWidget(parent), 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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void QRWidget::setQRData(QString data) |
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{ |
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this->data = "tox:" + 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->save(path, 0, 75); //0 - image format same as file extension, 75-quality, png file is ~6.3kb
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} |
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QString QRWidget::getImageAsText() |
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{ |
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paintImage(); |
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QByteArray ba; |
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QBuffer buffer(&ba); |
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buffer.open(QIODevice::WriteOnly); |
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image->save(&buffer, "PNG"); // writes the image in PNG format inside the buffer
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QString iconBase64 = QString::fromLatin1(ba.toBase64().data()); |
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QString base64Image = "<img width=\"300\" heigth=\"300\" src=\"data:image/png;base64," + iconBase64 +"\" />"; |
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return QString(base64Image); |
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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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QRcode *qr = QRcode_encodeString(data.toStdString().c_str(), 1, QR_ECLEVEL_M, QR_MODE_8, 0); |
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if(0 != qr) |
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{ |
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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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{ |
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const int yy = y * s; |
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for(int x = 0; x < s; x++) |
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{ |
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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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{ |
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const double rx1 = x * scale, |
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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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painter.save(); |
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} |
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else |
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{ |
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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 = 0; |
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} |
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@ -0,0 +1,26 @@ |
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#ifndef QRWIDGET_H |
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#define QRWIDGET_H |
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// https://stackoverflow.com/questions/21400254/how-to-draw-a-qr-code-with-qt-in-native-c-c
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#include <QWidget> |
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class QRWidget : public QWidget |
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{ |
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Q_OBJECT |
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public: |
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explicit QRWidget(QWidget *parent = 0); |
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void setQRData(QString data); |
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QString getImageAsText(); |
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QImage* getImage(); |
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bool saveImage(QString path); |
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private: |
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QString data; |
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void paintImage(); |
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QImage *image; |
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QSize size; |
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}; |
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#endif // QRWIDGET_H
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