Contrary to other qt documentation, documentation for the embedded part of qt is indeed poor. After few days of fiddling with it, I finally managed to solve it.
First thing to do is to compile the library with -qt-gfx-transformed
option (along with whatever you need).
Then you compile your application, and start it with the option you already used to activate the transformation driver. I actually started like this :
export QWS_DISPLAY=Transformed:Rot90:0
./app
As a test, I implemented this, to test whether the rotation works :
class X : public QObject
{
Q_OBJECT
public :
X() :
QObject()
{
QTimer *t = new QTimer( this );
connect( t, SIGNAL(timeout()), this, SLOT(OnTimerEvent()));
t->start( 2500 );
}
public slots :
inline void OnTimerEvent()
{
static int v = 0;
++v;
QWSDisplay::setTransformation(v%4);
std::cout<<v<<std::endl;
}
};
So, in the timer slot, I am changing the orientation with QWSDisplay::setTransformation
function.