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

[Stephan Haller]

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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