Re: Text engine for OpenGL renderer

[Thomas Treichl]

Shai Ayal schrieb:
> On Sat, Jun 27, 2009 at 4:09 PM, Thomas Treichl<address@hidden> wrote:
> > Can somebody please give a short Octave code example how I can check if text
> > rendering works or not after the inclusion of fontconfig into my binary (how
> > does it look like - I'm no plotting expert).
> >
> > Thanks,
> >  Thomas
>
> backend("fltk")
> plot(1:10)
>
> and see if the axis labels appear. you can than try "title", "xlabel", etc ...
>
> Shai

Your example works and the axis labels appear on my Mac OS X 10.4 system. But 
this only works once, if I call "plot", "xlabel" or "title" as a second command 
then Octave crashes. Here is what I mean by example:

  octave-3.2.0:1> backend ("fltk")
  octave-3.2.0:2> plot (1:10) # does work very well
  octave-3.2.0:3> plot (1:10)
  octave-3.2.0:4> error: could not match any font: *-normal-normal-12
  error: unable to load font:
  error: ft_render: unable to load appropriate font
  panic: Segmentation fault -- stopping myself...
  attempting to save variables to `octave-core'...
  save to `octave-core' complete

In debug mode I can reproduce the following output:

octave:1> backend ("fltk")
Reading symbols for shared libraries .... done
octave:2> plot (1:10) # does work very well
octave:3> Reading symbols for shared libraries . done
Reading symbols for shared libraries . done
Reading symbols for shared libraries . done
Reading symbols for shared libraries ... done
Reading symbols for shared libraries . done
Reading symbols for shared libraries .. done
Reading symbols for shared libraries . done
Reading symbols for shared libraries ....... done
Reading symbols for shared libraries ... done
Reading symbols for shared libraries . done
Reading symbols for shared libraries . done
Reading symbols for shared libraries . done
Reading symbols for shared libraries . done
octave:3> plot (1:10)
octave:4> error: could not match any font: *-normal-normal-12
error: unable to load font:
error: ft_render: unable to load appropriate font
Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: KERN_INVALID_ADDRESS at address: 0xfffffffd
0x90b40517 in __gnu_cxx::__exchange_and_add ()
(gdb) where
#0  0x90b40517 in __gnu_cxx::__exchange_and_add ()
#1  0x011be99c in input_event_hook () at basic_string.h:226
#2  0x02ba39a6 in command_editor::event_handler () at cmd-edit.cc:877
#3  0x00779524 in rl_read_key ()
#4  0x007610e1 in readline_internal_char ()
#5  0x007612d5 in readline ()
#6  0x02ba6ca4 in gnu_readline::do_readline (this=0x364fa50, address@hidden, 
address@hidden) at cmd-edit.cc:255
#7  0x02ba50e1 in command_editor::readline (address@hidden, address@hidden) 
at cmd-edit.cc:902
#8  0x011b9a33 in gnu_readline (address@hidden, force_readline=false) at 
input.cc:202
#9  0x011b9fbe in octave_gets () at input.cc:248
#10 0x011ba82a in octave_read (buf=0xf5000 "", max_size=8192) at input.cc:347
#11 0x011c1d4d in yy_get_next_buffer () at <stdout>:2879
#12 0x011cdba3 in octave_lex () at <stdout>:2721
#13 0x012aad4c in octave_parse () at parse.cc:2234
#14 0x012fc07b in main_loop () at toplev.cc:566
#15 0x012983df in octave_main (argc=6, argv=0xbfffda20, embedded=0) at 
octave.cc:886
#16 0x00006630 in main (argc=-1, argv=0xffffffff) at main.c:35
#17 0x00005f92 in _start ()
#18 0x00005eb9 in start ()
(gdb)

Any ideas? Thanks,
  Thomas

PS. Ben can you see this with Fink, too, or is it just my binary?