Re: drawing graphics

[Olexiy Avramchenko <ath beast stu cn ua>]

CAVEY GERARD wrote:

> thus i think it s a bit dirty... because i don t clear the previous drawing
> area back buffer!!
> how can i get a pointer to that back buffer 
> i know i could use a global variable but...
> ; i didn t find gdk_window_get_back_pixmap  :P
> any idea? 
   In gtk+-2.0 gdk_window_set_back _pixmap() saves the pointer to your 
pixmap
in bg_pixmap field of GdkWindowObject structure, but this call will 
unref the previous
pixmap, so it will be auto-destroyed. To obtain the pointer you needed 
you have to
cast ((GdkWindowObject*)widget->window)->bg_pixmap.
   In case of gtk+-1.2 gdk doesn't save the pointer to your bg pixmap, 
it just call
XSetWindowBackgroundPixmap. So, the only one way I see is to get the XID
of window background pixmap from X and call gdk_xid_lookup(),
however I dont know how to do this...

Olexiy