Re: EXC_BAD_ACCESS [was: persistent listeners]

[logari81]

On Sun, 2011-03-13 at 11:52 -0400, Ben Abbott wrote:
> On Mar 13, 2011, at 11:31 AM, logari81 wrote:
> 
> > On Sun, 2011-03-13 at 11:20 -0400, Ben Abbott wrote:
> >> On Mar 12, 2011, at 5:06 PM, logari81 wrote:
> >> 
> >>> Yes your last change would cancel my intention in my previous change.
> >>> The idea is that the lines:
> >>> 
> >>> ||    if (uimenu->items_to_show ())
> >>> ||      show_menubar ();
> >>> ||    else
> >>> ||      hide_menubar ();
> >>> 
> >>> should be before the first allocation of the canvas:
> >>> 
> >>> ||      // This allows us to have a valid OpenGL context right away.
> >>> ||      canvas->mode (FL_DEPTH | FL_DOUBLE );
> >>> ||      if (fp.is_visible ())
> >>> ||        {
> >>> ||          show ();
> >>> ||          if (fp.get_currentaxes ().ok())
> >>> ||            show_canvas ();
> >>> ||          else
> >>> ||            hide_canvas ();
> >>> ||        }
> >>> 
> >>> otherwise, at least with my fltk version, the first time anything is
> >>> plotted is vertically shifted by the menu bar height which was very
> >>> annoying.
> >>> 
> >>> So we have to find some other solution. Maybe Shai could give us a hint.
> >>> 
> >>> Kostas
> >> 
> >> I'm not certain, but it sounds like a problem I have seen on MacOS.
> >> 
> >> In my case, I was unable to see the menu bar and the status bar at the 
> >> same time. In each of these cases, the plot was shifted vertically.
> >> 
> >> I was able to fix this by uninstalling fltk-aqua-1.1.10. The package for 
> >> fltk-aqua-shlibs-1.1.10 remains installed.
> >> 
> >> Ben
> > 
> > hmm, should I revert the first half of my problematic changeset in hg
> > until we find a better solution?
> > 
> > Unfortunately I do not have a deep understanding of how fltk+OpenGL
> > works so that I can propose a reliable way for fixing these canvas
> > initialization issues.
> > 
> > Kostas
> 
> I checked on Ubuntu, the problematic changset produces a core-dump for ...
> 
>       graphics_toolkit fltk
>       figure (1, "visible", "off")
> 
> ... as Soren had expected.
> 
> I think it best to revert 12483.
> 
> I'm still curious about the vertical shift. I used the simple script below to 
> verify that I no longer have a vertical shift.
> 
>       x = repmat (0:0.1:1, 11, 1);
>       figure (1)
>       plot ([x, x'], [x', x])
>       axis off
>       set (gca, "position", [0 0 1 1])
> 
> With 12483 reverted I don't see a shift.  I've attached a pdf that looks the 
> same as what is displayed.
> 
> Ben
> 
> 
> 

Now that I have reverted the first half of 12484(9c831d357e6f) your
crashes should disappear but I get the vertical shift again that you can
see in the attached pictures. Just after plotting the axes are lower
than they should (before-drawnow.png). Calling drawnow will bring axes
to their correct position (after-drawnow.png)

Kostas

before-drawnow.png
Description: PNG image

after-drawnow.png
Description: PNG image