Today, I has profiling my application. I detect, that huge part of time it converts from double to integer and back!

// int zoom;
// QPoint offset
QPoint screenToGeo(const QPoint& screen)
{
    return offset + screen * zoom;
}

Please ADD integer operators, and (possibly) remove qreal operator. Since QPoint intended for integer coordinates, operators should be integer. If one want to have qreal operators, He should write using QPointF.

I think it is bug, not suggestion....QPoint should not have qreal operators.