QImage->QPixmap
QImage image("snakegame.png");
QPixmap pixmap = QPixmap::fromImage(image);
QPixmap->QImage
QPixmap pixmap("snakegame.png");
QImage image = pixmap.toImage();
QImage image("snakegame.png");
QPixmap pixmap = QPixmap::fromImage(image);
QPixmap pixmap("snakegame.png");
QImage image = pixmap.toImage();