[Qt-interest] How to detect the graphicssystem at runtime

[Uwe Rathmann]

Giuseppe D'Angelo wrote:

>> Does someone has an idea how to find out if an application runs with
>> "native" or "raster" on X11 ?
>     QPixmap pixmap(1, 1);
>     qDebug() << pixmap.paintEngine()->type();

I had tried to check the paint engine of the widget, what gives a different 
result than the pixmap with graphics system "raster".

AFAIR in an earlier version of Qt it was not safe to call 
QPaintDevice::paintEngine() and I had to create a QPainter on this device 
first to get the paint engine, but this seems to be gone with Qt 4.7 ( or my 
memory is wrong ).

Thanks for the solution,

Uwe