int main(int argc, char **argv) { QApplication app(argc, argv); qApp->setAttribute(Qt::AA_UseHighDpiPixmaps); PixmapPainter pixmapPainter; pixmapPainter.show(); Labels label; label.resize(200, 200); // label.show(); MainWindow mainWindow; // mainWindow.show(); StandardIcons icons; icons.resize(510, 510); // icons.show(); Caching caching; caching.resize(300, 300); // caching.show(); Style style; // style.show(); Fonts fonts; // fonts.show(); IconDrawing iconDrawing; // iconDrawing.show(); Buttons buttons; // buttons.show(); return app.exec(); }