[Qt-interest] Problem with setting the top level window background picture

[qiang zhang]

Hi,

int main( int argc, char ** argv )
{
        QApplication app(argc, argv);
        QWidget w;
        w.setAutoFillBackground(true);
        QPalette palette;
        palette.setBrush(QPalette::Window,
QBrush(QPixmap("./default.jpg")));
        w.setPalette(palette);
        w.show();
        return app.exec();
}

I want to use qpalette to set the background picture. As above the result is
that the background picture just has a flicker and then turn back gray.But
when I resize a window by dragging its top or left borders (and only those),
the content of the window is drawn with a slight lag, and the background
picture appears briefly on the bottom (respectively right) side the window,
filling the gap created by the resizing.
The same program run on some other machine  is as expected.  I don't know
why.
Can some one help me? Thanks in advanced.
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