[Octave-bug-tracker] [bug #39936] Error or crash when plotting with no fonts installed

[Mike Miller]

URL:
  <http://savannah.gnu.org/bugs/?39936>

                 Summary: Error or crash when plotting with no fonts installed
                 Project: GNU Octave
            Submitted by: mtmiller
            Submitted on: Wed 04 Sep 2013 12:33:15 AM EDT
                Category: Plotting
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: GNU/Linux

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Details:

I'm not sure if anything can be done about this in Octave, and maybe this is a
completely invalid configuration to test against, feel free to close as
invalid if so. But reporting anyway since it could potentially happen on
misconfigured systems and results in a variety of errors.

Testing on a system with no fonts installed, simulated by intentionally doing
the following as root on my system:


# mv /usr/share/fonts /usr/share/fonts-diverted
# mv /etc/fonts /etc/fonts-diverted
# rm -rf /var/cache/fontconfig


With gnuplot, the following warnings and errors occur, Octave stays running:


octave:1> plot (1:10);
warning: could not match any font: *-normal-normal-10
warning: ft_render: unable to load appropriate font
warning: could not match any font: *-normal-normal-10
warning: ft_render: unable to load appropriate font
[...]
warning: ft_render: invalid bounding box, cannot render
[...]
octave:2> legend;
warning: could not match any font: *-normal-normal-10
warning: ft_render: unable to load appropriate font
[...]
error: legend: A(I): index out of bounds; value 3 out of bound 0
error: called from:
error:   /.../share/octave/3.7.6+/m/plot/legend.m at line 622, column 22
error: structure has no member 'orientation'
error: evaluating argument list element number 1
error: called from:
error:   /.../share/octave/3.7.6+/m/plot/private/__go_draw_axes__.m at line
-1, column -1
error:   /.../share/octave/3.7.6+/m/plot/private/__go_draw_figure__.m at line
172, column 17
error:   /.../share/octave/3.7.6+/m/plot/__gnuplot_drawnow__.m at line 86,
column 5



Using FLTK, Octave simply exits after the same stream of warnings:


octave:1> plot (1:10);
warning: could not match any font: *-normal-normal-10
warning: ft_render: unable to load appropriate font
warning: could not match any font: *-normal-normal-10
warning: ft_render: unable to load appropriate font
[...]
Unable to find fonts. Check your FontConfig configuration.

$ echo $?
1



The last error message and call to exit(1) are in the FLTK library itself.




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