#include <QFont>
#include <QFontDatabase>

#include <QDebug>
#include <QMessageBox>

#include <QString>

#include <QLabel>
#include <QWidget>
#include <QVBoxLayout>

#include <QApplication>

int main(int argc, char *argv[])
{
  // application
  QApplication app(argc,argv);

  // directory of test font files
  const QString appdir(QCoreApplication::applicationDirPath()),
                fontdir(QCoreApplication::applicationDirPath()+QStringLiteral("/../../"));

  // regular and bold font files
  const int reguid = QFontDatabase::addApplicationFont(fontdir+QStringLiteral("NotoSans-Regular.ttf")),
            boldid = QFontDatabase::addApplicationFont(fontdir+QStringLiteral("NotoSans-Bold.ttf"));
  if(reguid==-1 || boldid==-1)
    { (void)QMessageBox::critical(nullptr,QStringLiteral("Error"),QStringLiteral("Could not open font file"));
      return 1;
    }

  // regular and bold fonts
  QFont regufont("Noto Sans",72),
        boldfont("Noto Sans Bold",72);
  regufont.setHintingPreference(QFont::PreferFullHinting);
  boldfont.setHintingPreference(QFont::PreferFullHinting);
  qDebug() << "regular " << regufont.toString();
  qDebug() << "bold "    << boldfont.toString();

  // fonts used in labels
  QLabel *regulabel = new QLabel(QStringLiteral("Font regular qwerty")),
         *boldlabel = new QLabel(QStringLiteral("Font bold qwerty"));
  regulabel->setFont(regufont);
  boldlabel->setFont(boldfont);

  // show labels
  QWidget widget;
  QVBoxLayout *layout = new QVBoxLayout();
  layout->addWidget(regulabel);
  layout->addWidget(boldlabel);
  widget.setLayout(layout);
  widget.show();

  return QApplication::exec();
}