#pragma once

#ifndef GLWIDGET_FOR_HIGHDPI_H

#define GLWIDGET_FOR_HIGHDPI_H

#include <qopenglwidget></qopenglwidget>

#include <qapplication></qapplication>

#include <qdesktopwidget></qdesktopwidget>

// use obsolete QGLWidget instead of QOpenGLWidget for now...

// TODO: replace with the "modern" OpenGL source and transfer to QOpenGLWidget

class GLWidgetForHighDpi : public QOpenGLWidget {

public:

  GLWidgetForHighDpi(QWidget *parent              = Q_NULLPTR,

                     const QOpenGLWidget *shareWidget = Q_NULLPTR,

                     Qt::WindowFlags f            = Qt::WindowFlags())

      : QOpenGLWidget(parent, f) {}

  // returns device-pixel ratio. It is 1 for normal monitors and 2 (or higher

  // ratio) for high DPI monitors. Setting "Display > Set custom text size(DPI)"

  // for Windows corresponds to this ratio.

  int getDevPixRatio() const {

    static int devPixRatio = QApplication::desktop()->devicePixelRatio();

    return devPixRatio;

  }

  //  modify sizes for high DPI monitors

  int width() const { return QOpenGLWidget::width() * getDevPixRatio(); }

  int height() const { return QOpenGLWidget::height() * getDevPixRatio(); }

  QRect rect() const { return QRect(0, 0, width(), height()); }

};

#endif