On Fri, Jan 10, 2003 at 09:10:02AM -0500, Dan Espen wrote:
> Dominik Vogt <fvwm_at_fvwm.org> writes:
> > On Thu, Jan 09, 2003 at 06:59:35AM -0800, EXT-Wilson, William A wrote:
> > > Dan,
> > >
> > > Attached is a tarball with a sample program. I have included stripped down
> > > versions of the two files which are required and a tc.m which will make it.
> > > The g_plot file normally resides in
> > > ~/app-defaults/g_plot. The part of the code which I suspect is not working
> > > correctly with fvwm is:
> > >
> > > /*
> > > * Turn on backing Store & Save Under
> > > */
> > > if (strcmp(expose,"SERVER") == 0) {
> > > attrib.backing_store = Always;
> > > attrib.save_under = True;
> > > }
> > > else {
> > > attrib.backing_store = NotUseful;
> > > attrib.save_under = False;
> > > }
> > > XChangeWindowAttributes(screen[snum].G_plot_disp,screen[snum].G_plot_win,
> >
> > > CWBackingStore | CWSaveUnder,&attrib);
> > >
> > > which is in x11_gplot.c. This code (which I don't understand was coded a
> > > long time ago for a Sun based sonar system which used a Techsource display
> > > VME card. Things have changed over the years and we keep tinkering with th
> > e
> > > plot package to make it work. Using fvwm delivered with Red Hat 7.2 (maybe
> > > 7.3) everything was OK. You could minimize a g_plot window and bring it
> > > back and you could cover it up with another window and it would restore.
> > > Now, when you bring it back, the covered area is black. The only part that
> > > comes back is the border and the window title "Gplot Graphics ...".
> > >
> > > Any and all suggestions would be appreciated.
> >
> > Is there any chnace that gplot thinks that backing store is used
> > when it sets "attrib.backing_store = Always;"? Can you check if
> > gplot checks whether backing store is supported by the X server?
> > I have heard something about newer XFree releases no longer
> > supporting backing store, but that may not be true.
>
> I have the above code. I'll forward it if requested.
>
> The string "expose" is always "SERVER", so it always turns on
> backing store.
>
> In addition, it always calls:
>
> XSetGraphicsExposures(screen[snum].G_plot_disp,
> screen[snum].plot_gc,False);
>
> So it tells the X Server it doesn't want expose events.
>
> And, it has no logic to receive expose events.
>
> I tested the code and the screen comes up white, with no detail.
> When I cover and uncover it, it remains white. Perhaps I don't
> see any problem because I'm running XFree86 3.3.6.
>
> It does seem to be relying on the X Server to restore the
> window content.
Just as I suspected. Some apps implicitly require that backing
store works, and the main problem is the changed default in XFree.
Bye
Dominik ^_^ ^_^
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Received on Fri Jan 10 2003 - 08:49:05 GMT