关于QT打印机QPrinter打印图片的问题？

如题，用QT打印一个图片，如何使用QPrinter，小菜一枚求大神指点！

QPainter painter(&printer);
QRect rect = painter.viewport();
QSize size = image.size();
size.scale(rect.size(), Qt::KeepAspectRatio);
painter.setViewport(rect.x(), rect.y(),
size.width(), size.height());
painter.setWindow(image.rect());
painter.drawImage(0, 0, image);