It is used for virtual desktops. ie. plane is larger than viewable space. It is also frequently used for buffering. Where you will display the next frame, or series of frames in offscreen memory, and swap your x,y position on vsync to 'flip buffers'. I have seen it used in implementations for vertical scroll, since panning is much less expensive than many horizontal writes on graphics hardware.
Bryan Bui-Tuong wrote: > What is the PAN ioctl used for? Something like Window scrolling? > > >> -----Original Message----- >> From: Brian G. Rhodes [mailto:[EMAIL PROTECTED] >> Sent: Wednesday, May 21, 2008 11:01 AM >> To: Bryan Bui-Tuong >> Cc: directfb-users@directfb.org >> Subject: Re: [directfb-users] Could not open Module Directory (input >> drivers & gfxdrivers) and Panning display failed >> >> Your kernel driver doesn't implement the PAN ioctl. >> >> Bryan Bui-Tuong wrote: >> >>> So all the examples seem to be running, but why am I still getting >>> >> this >> >>> error? >>> >>> (!) DirectFB/FBDev: Panning display failed (x=0 y=0 ywrap=0 vbl=0)! >>> --> Invalid argument >>> >>> If I can't really fix it or it's not a big deal then I'll leave it at >>> >> that >> >>> and move on. >>> >>> V/R, >>> Bryan >>> >>> >>> >>> _______________________________________________ >>> directfb-users mailing list >>> directfb-users@directfb.org >>> http://mail.directfb.org/cgi-bin/mailman/listinfo/directfb-users >>> >>> >>> > > > > _______________________________________________ > directfb-users mailing list > directfb-users@directfb.org > http://mail.directfb.org/cgi-bin/mailman/listinfo/directfb-users > > _______________________________________________ directfb-users mailing list directfb-users@directfb.org http://mail.directfb.org/cgi-bin/mailman/listinfo/directfb-users
