Flickering problems after double buffering

Hi,

I have encountered flickering problems with my drawing. I have already used 
double buffering, but the screen still flashes every time it updates. I 
coded using QT/e and tested with OPIE on a iPAQ h5400.  Could any one help? 
Thank you.

Here is some code:

void playerclientimpl::paintEvent( QPaintEvent *)
{
	int x, y, w, h, i;
	static int previous_color[16];

	QPixmap doubleBuffer (230, 145);
	doubleBuffer.fill(Qt::white);

	QPainter dbpaint(&doubleBuffer);

	 // draw to the QPixmap.....

	 dbpaint.end();

	 dbpaint.begin(this);
	 dbpaint.drawPixmap(0, 0, doubleBuffer, 0, 0, 20, 15);
}



Best Wishes,

Jing

********************
System Config:
FC4 (2.6.13)
KDE 3.4
gcc 4.0.1
arm-linux-gcc 3.4.1 from handhelds.org
*********************


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