[Paraview] Fwd: saving screen shot as a PNG image, Paraview-3.8.0

[Dave Partyka]

Hi Rakesh,

You mentioned CVS. I just want to double check are you really still using
CVS ParaView? or are you on the git release branch? Or using the source
tarball from the webpage?

On Fri, Aug 13, 2010 at 2:26 PM, Rakesh Hammond <
rakesh.hammond at googlemail.com> wrote:

>
>
> ---------- Forwarded message ----------
> From: Rakesh Hammond <rakesh.hammond at googlemail.com>
> Date: 13 August 2010 19:26
> Subject: Re: [Paraview] saving screen shot as a PNG image, Paraview-3.8.0
> To: pat marion <pat.marion at kitware.com>
>
>
> Hi Pat,
>
> Thanks for your suggestion - but didn't help, PV-3.8 still crashed.
>
> I am able to save the screen shot using other formats (jpg, bmp etc).
>
> I looked into it a little bit further and I think this is where its seg
> faulting
> (I am on 3.8 release branch, not the latest CVS)
>
> in vtkPNGWriter.cxx
>
> line 278 - the following for loop
>
>  for (ui = 0; ui < height; ui++)
>     {
>     row_pointers[height - ui - 1] = (png_byte *)outPtr;
>     outPtr = (unsigned char *)outPtr + rowInc;
>     }
>
> However, if I put a print statement inside the for loop(Hello world for
> example), PV doesn't crash.  This may be due to a memory leak some where
> else.
>
> Can some one please comment on what sort of modifications I should make to
> the above code?
>
> I think this may be a nasty bug to recreate - has any one else encountered
> this problem?
>
> This is what I tried to do
>
> start PV
> Load some data
> File->SaveScreenShot->
> Now choose the .PNG format and my PV-3.8 crashes
>
> Regards,
>
>
> On 12 August 2010 19:26, pat marion <pat.marion at kitware.com> wrote:
>
>> Hi Rakesh,
>>
>> In Edit -> Settings -> Render View there is an option "Use Offscreen
>> Rendering for Screenshots."  On some systems, this option will cause a crash
>> when enabled.
>>
>> Pat
>>
>> On Thu, Aug 12, 2010 at 1:42 PM, Rakesh Hammond <
>> rakesh.hammond at googlemail.com> wrote:
>>
>>>  Hi
>>>
>>> I have a .pvti file which I can visualize in Paraview-3.8.0.
>>>
>>> I would like to save a slice from my data set and able to display the
>>> results correctly.
>>> However, when I select SaveScreen option with PNG format, it seg faults.
>>>
>>> I am able to get this to work correctly on 3.6.2 without seg faulting.
>>>
>>> I am on SuSe-10.2.
>>>
>>> Do I need to turn on the USE_SYSTEM_PNG flag in CMake and re-compile?
>>> I haven't done this for 3.6.2 and works OK.
>>>
>>> Has any one else come across this problem before?
>>>
>>> Any pointers would be greatly appreciated.
>>>
>>> Regards,
>>>
>>> Rakesh
>>>
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>>
>
>
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>
> Visit other Kitware open-source projects at
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>
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