Getting window previews (was: Parsing enviroment variables of a process at a BSD-like operating system)

[adlo]

I had a look at xfwm4's source code, and I don't think I could see anything of that nature (though there is a lot of code, so I haven't looked through everything).

Do you know of anyone who might know how skippy-xd works, or anyone who might know how to convert an X11 pixmap into a GdkPixbuf?

Regards

adlo



> On 7 Jul 2015, at 21:43, Stephan Haller <nomad at froevel.de> wrote:
> 
> Hi,
> 
> Sorry, I cannot answer any of these questions but I think skippy-xd's
> method is less CPU consuming. I can only advice to look at skippy-xd's
> source code. And also take a look at xfwm4 source code because - if I
> remember right - it shows how to convert such a window preview in a
> GdkImage which should be usuable in a GTK+ application.
> 
> I'm sorry that I will not be helpful for futher advices.
> 
> Regards,
> Stephan
> 
> Am Montag, den 06.07.2015, 15:09 +0100 schrieb ade low:
>> How CPU-efficient is skippy-xd's method?
>> 
>> Are there any other methods that are more CPU-efficient (without using 3D acceleration)?
>> 
>> How easy would it be to put skippy-xd inside a GTK2 application and pack it in with some other widgets?
>> 
>> Regards
>> 
>> adlo
>> 
>> 
>>> On 6 Jul 2015, at 05:36, Stephan Haller <nomad at froevel.de> wrote:
>>> 
>>> Hi,
>>> 
>>> Am Sonntag, den 05.07.2015, 21:46 +0100 schrieb ade low:
>>>> By the way, what method does xfdashboard use to get the previews when xfwm4 is running?
>>> To be honest I do not do anything to get the preview of any windows. I
>>> use the library Clutter (or Cogl to be more precisely) which does all
>>> the work for me. That was also the decision to use Clutter 3 year ago
>>> when I started developing xfdashboard.
>>> 
>>> Nowadays I know I could get these previews also with XComposite,
>>> XDamage, XRender and so on. If you want to avoid a big library like
>>> Clutter/Cogl or OpenGL at all then consider to have a look how skippy-xd
>>> gets the previews. But these are still images and not live updated like
>>> Clutter does.
>>> 
>>> Regards,
>>> Stephan
>>> 
>>>> 
>>>> 
>>>>> On 5 Jul 2015, at 20:36, Stephan Haller <nomad at froevel.de> wrote:
>>>>> 
>>>>> Hi Devs,
>>>>> 
>>>>> I know you as being sensitive that all Xfce related applications are
>>>>> running well also at BSD-like operating systems. That's why I ask you
>>>>> for help.
>>>>> 
>>>>> I'm the author of xfdashboard. I just implemented an application tracker
>>>>> which tries to determine which applications are running and marking the
>>>>> corresponding icon in the favourites.
>>>>> 
>>>>> To archive it xfdashboard listens to newly opened windows, gets its
>>>>> process id and parses the enviroment variable set of the process
>>>>> at /proc/<<PID>>/environ. If it contains all needed environment
>>>>> variables and if their values are valid, then an application is
>>>>> considered to be running and marked. It is ok that this
>>>>> file /proc/<<PID>>/environ only contains the environment variables and
>>>>> name at the time the process was spawned. I do not need to know if they
>>>>> changed in the meantime.
>>>>> 
>>>>> I know BSD is working a different way but I have no idea at all how BSD
>>>>> is working in real. So how can get this enviroment variable set under
>>>>> BSD? I really would like to use the algorithm at BSD as well because it
>>>>> is the best way I found.
>>>>> 
>>>>> I hope you can help me.
>>>>> 
>>>>> Regards,
>>>>> Stephan
>>>>> 
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