[Qt] QPixmap::handle(): Pixmap is not an X11 class pixmap

[zeljko]

On Thursday 21 of April 2011 17:39:01 Juha (gmail) wrote:
> zeljko kirjoitti keskiviikko, 13. huhtikuuta 2011 15:38:11:
> > On Wednesday 13 of April 2011 10:17:30 Juha (gmail) wrote:
> > > I am getting the output (in subject) from Lazarus compiled with QT
> > > bindings. Is it something to worry about?
> > 
> > Yes. Something is wrong with Qt libs. Or you provided wrong QPixmap to Qt
> > or similar.
> 
> I am still getting it all the time from Lazarus itself when I open a menu
> item or dialog.

Look at qt implemenation below. That comes from function which isn't called 
from qtlcl, but from qt.It's just warning that passed data isn't valid X11 
object. I cannot get such warning.You said that it happens when you open an 
menu or dialog, so it's easy to see if it's qtlcl or qt problem.There's only 
one function inside qtlcl which draws image (qtobjects -> 
TQtDeviceContext.drawImage). Put there an writeln and see if warning comes 
after that function is called.

/*!
    Returns the pixmap's handle to the device context.

    Note that, since QPixmap make use of \l {Implicit Data
    Sharing}{implicit data sharing}, the detach() function must be
    called explicitly to ensure that only \e this pixmap's data is
    modified if the pixmap data is shared.

    \warning This function is X11 specific; using it is non-portable.

    \sa detach()
*/

Qt::HANDLE QPixmap::handle() const
{
#if defined(Q_WS_X11)
    const QPixmapData *pd = pixmapData();
    if (pd) {
        if (pd->classId() == QPixmapData::X11Class)
            return static_cast<const QX11PixmapData*>(pd)->handle();
        else
            qWarning("QPixmap::handle(): Pixmap is not an X11 class pixmap");
    }
#endif
    return 0;
}