Text engine for OpenGL renderer

[Ben Abbott]

On Jun 28, 2009, at 3:43 PM, Ben Abbott wrote:

> On Jun 28, 2009, at 2:13 PM, Thomas Treichl wrote:
>
>> Shai Ayal schrieb:
>>> On Sat, Jun 27, 2009 at 4:09 PM, Thomas Treichl<Thomas.Treichl at gmx.net 
>>> > 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,  
>> prompt=@0xffffffff, eof=@0xbfffcdec) at cmd-edit.cc:255
>> #7  0x02ba50e1 in command_editor::readline (prompt=@0xbfffceb4,  
>> eof=@0xbfffcdec) at cmd-edit.cc:902
>> #8  0x011b9a33 in gnu_readline (s=@0xbfffceb4,  
>> 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?
>
> I ran a few commands below. I had no problems until "quit".
>
> octave:2> close all
> octave:3> backend ("fltk")
> octave:4> plot(1:10)
> octave:5> plot(1:10)
> octave:6> plot(1:10)
> octave:7> figure(2)
> octave:8> plot(1:10)
> octave:9> surf(peaks)
> octave:10> ca=nan
>
> octave:10> quit
>
> panic: Segmentation fault -- stopping myself...
> attempting to save variables to `octave-core'...
> terminate called after throwing an instance of 'std::length_error'
>  what():  basic_string::_S_create
> panic: attempted clean up apparently failed -- aborting...
>
> Ben

A quick follow up.

I ran the plot demos. The quality of what works is excellent.

For me the contours do not have color, and image objects do not  
display. Are those features still missing, or does this indicate a  
problem local to my system/setup?

Ben