[Xorg-driver-geode] Xserver: ModifyPixmapHeader function question

[Cui, Hunk]

Hi, all,
	The function: "pScreen->ModifyPixmapHeader(pPixmap, width,
height, depth, bitsPerPixel, devKind, pPixData)". 
	I know this routine takes a pixmap header. pPixmap must have
been created via pScreen->CreatePixmap with a zero width or height to
avoid allocating space for the pixmap data. pPixData is assumed to be
the pixmap data. It will be stored in an implementation-dependent place
(usually pPixmap->devPrivate.ptr).
	How to find the pixmap data (in pPixmap->devPrivate.ptr) after
create Pixmap? Which function will get this pixmap data?

Thanks,
Hunk Cui