[Digikam-devel] [Bug 200654] New: image dimensions in albums slows down scrolling dramatically

[Romain Vimont]

https://bugs.kde.org/show_bug.cgi?id=200654

           Summary: image dimensions in albums slows down scrolling
                    dramatically
           Product: digikam
           Version: unspecified
          Platform: Ubuntu Packages
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: digikam-devel at kde.org
        ReportedBy: rom1v at yahoo.fr


Version:            (using KDE 4.2.4)
OS:                Linux
Installed from:    Ubuntu Packages

When enabling in album view the dimension of images, it seems to recompute the
result (read again the .jpg file, which is slow) every time the renderer is
called : when you scroll, it "freezes" very often (for maybe 200ms), which
makes the scrolling not smooth at all.

As soon you disable the showing of image dimensions, it is very smooth. If you
enable filename or some other information, that's ok, the only problem is with
image dimensions.

To resolve the problem, I suppose two thing should be done :
- compute the image dimension (read the file) asynchronously (like for the
thumbnails)
- cache the dimensions, to avoid recomputing them (like for the thumbnails)

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