[Digikam-devel] [Bug 277927] New: Demosaicing (GUI) makes Xorg take 30% CPU

[S. Burmeister]

https://bugs.kde.org/show_bug.cgi?id=277927

           Summary: Demosaicing (GUI) makes Xorg take 30% CPU
           Product: digikam
           Version: 2.0.0
          Platform: openSUSE RPMs
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: digikam-devel at kde.org
        ReportedBy: sven.burmeister at gmx.net


Version:           2.0.0 (using Devel) 
OS:                Linux

I'm not sure this is really bound to demosaicing, it might as well be a general
GUI issue.

If I open a RAW image in the image editor the demosaicing sidebar opens with
the post-processing tab active. That pane has two histograms which need
calculating i.e. they do not show up but have a turning circle which signals
that there is work in progress. Other than that there is only the progress bar
in the status bar at the bottom-left which moves.

These two elements or some non-visible task make Xorg consume 30% CPU and hence
slows down digikam's demosaicing. The cpu usage starts when the demosaicing
starts and stops as soon as the picture is displayed.

Disabling desktop effects does not help, so I do not think it is related to
some effect.

Or is Xorg used to demosaic?

Reproducible: Always

Steps to Reproduce:
Open the process list and sort for CPU usage
Set digikam to open the demosaicing tool when opening a RAW picture in the
image editor
Open a RAW picture in the image editor

Actual Results:  
Xorg consumes 30% CPU while demosaicing

Expected Results:  
Only digikam should consume cpu while demosaicing.

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