On Thu, 2003-08-21 at 23:12, Andy Isaacson wrote: > On Fri, Aug 15, 2003 at 12:06:18PM +0200, Michel Dänzer wrote: > > On Wed, 2003-08-13 at 16:29, Andy Isaacson wrote: > > > I'm not familiar with how those two X servers operate, so could you help > > > me out by explaining? How do they handle window obscures? How is it > > > different from X11's BackingStore? > > > > I don't know a lot of details yet, but they indeed always keep the > > contents of windows around and composite the desktop with them > > (actually, they have another windowing system do this, but that's not > > the point). > > Seems to me you've got to break X11 semantics in order to do this: I > suppose they must disable PartiallyObscured events, otherwise the > "hidden" portion of the app windows won't get updated.
I don't know, CC'ing the DirectFB development list for comments. (Personally, I'd consider even outdated window contents more useful than unrelated contents or none at all until the client handles the expose event?) > > > too often the BS pixmap is too old, and the X server writes it to the > > > framebuffer only to have it overwritten by the app as soon as it's > > > scheduled. > > > > Well, do you want the windows to be refreshed ASAP or not? :) I don't > > think this is a big deal as the windows will be kept in video RAM > > whenever possible. > > I want the window contents to be correct, or at least, innocuous. I > agree that if the backing store is kept in the off-screen framebuffer > the overhead is minimal; I don't think XFree86's BS implementation can > do that. Right. I haven't noticed much difference in general with my every day apps, except that XDirectFB looks and feels snappier and smoother. > In general I want the system to work correctly an in a performant > manner even if the number of windows exceeds available off-screen > framebuffer memory. It would be interesting how it performs in that case indeed; I don't expect it to be too bad though as it was quite usable even without any hardware acceleration. -- Earthling Michel Dänzer \ Debian (powerpc), XFree86 and DRI developer Software libre enthusiast \ http://svcs.affero.net/rm.php?r=daenzer _______________________________________________ Devel mailing list [EMAIL PROTECTED] http://XFree86.Org/mailman/listinfo/devel
