Re: print error and 4.0.1

[Pantxo]

Rik-4 wrote
> On 10/19/2015 04:00 PM, Michael Godfrey wrote:
>> Rik,
>>
>> I thought about the suggestion of enclosing the actual print call to
>> OpenGL
>> in visible, off ... visible, on...  When I considered this it seemed like
>> overkill. But, now I wonder: is there any reason to have visible on while
>> the plot is being printed? If not, this could not only be a helpful fix
>> for 4.0.1, but it stay in for as long as it takes... It would still be
>> nice to
>> resolve the seg fault bug, but it is likely from what I have learned that
>> it is not entirely an Octave problem. I think that the bug report to
>> the OpenGL folks is still open.
>>
>> The full test should be:
>>
>> if (visible on}
>>     visible off
>>     actual print xxx
>>     visible on
>> else
>>     actual print xxx
>> endif
>>
>> Michael
>>
> 
> Michael, and anyone else who knows more about the print bug,
> 
> I think the issue is reversed.  Isn't the problem that when the figure is
> invisible Octave goes through the OSMESA libraries, whereas when it is
> visible it goes through Gl2ps and is okay (at least no segfault).  The big
> issue seems to be OpenGL and patches on Windows systems.  There are more
> than four bug reports about crashes of the plot system on Windows
> platforms
> that usually only involve clicking on a plot with a patch object.
> 
> --Rik

Hi,

@Michael:
Offscreen printing only works on some linux machines (those that don't use
proprietary drivers) so I would not recommend to do this change until we
find a way to have it work on most platforms.

@Rik: Can you point to those bugs on windows?
Also, gl2ps_print is called in both situations, either with an OpenGL
context/feedback buffer provided by OSMesa (in case "visible", "off") either
by Qt/FLTK (which use the default installed openGL driver/library depending
on the platform).

Pantxo



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