QPixmap save function size overflow

There is an overflow during creation of jpeg if size exceed 32767 in one of directions.

Reproduction: create big enough jpeg.

Code example:

scene - is custom struct

auto b_r = scene.BoundingRect();

auto target_rect = QRectF(0,0,b_r.width() * 600.0 / 25.4, b_r.height() * 600.0 / 25.4);

QPixmap pm(target_rect.toRect().size());

pm.fill(Qt::white);

QPainter painter(&pm);

............

scene.sc->render(&painter, target_rect, b_r);  // scene.sc is a QGraphicsScene

pm.save(fn,"JPG");