mupdf: how to put a fz_pixmap into Qt4 QPixmap

I am trying to exploit mupdf library (Qt4 app). I have taken some code from pdfdraw.c. I was able t开发者_如何学运维o create a pixmap (fz_pixmap) from a pdf page. Now I need to display the pixmap. It is likely I can use QPixmap but I ask how to do so.