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

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: [hidden email]
        ReportedBy: [hidden email]


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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[Gilles Caulier-4]

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--- Comment #1 from Gilles Caulier <caulier gilles gmail com>  2009-07-18 16:00:52 ---
Which digiKam version you use exactly ?

Gilles Caulier

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Gilles Caulier <[hidden email]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|general                     |Albums GUI




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--- Comment #2 from Andi Clemens <andi clemens gmx net>  2009-07-18 16:07:42 ---
I can see no real difference with dimensions turned on and off.
Maybe callgrind will show something, but right now for me it is working fine.

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--- Comment #3 from Romain Vimont <rom1v yahoo fr>  2009-07-18 16:13:59 ---
I use digikam 0.10.0.

Try in an album with for example 200 photos, and scroll very fast. I tested on
2 computers, and there is really a difference.

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Gilles Caulier <[hidden email]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Version|unspecified                 |0.10.0




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--- Comment #4 from Romain Vimont <rom1v yahoo fr>  2009-07-18 16:48:43 ---
The two computer on which I tested had no real graphic card (a lowcost intel
gma…).

I tested on my laptop, with nvidia (and nvidia proprietary drivers), and
effectively, with or without dimensions, it works fine.

I don't know if this is a graphic card problem, my laptop is far faster than
the two others for every component (cpu, ram, harddrive, graphic card), so I
don't know what does limit the performances on the others when dimensions
details are enabled.

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--- Comment #5 from Romain Vimont <rom1v yahoo fr>  2009-07-18 17:10:12 ---
In fact, it seems to be a graphical performances problem : if I enable any
information under the photo (filename, dimensions), it slows down dramatically
on computer with slow graphical card (layout too complicated?) (but dimensions
slows down more than filename).

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--- Comment #6 from Andi Clemens <andi clemens gmx net>  2009-07-18 20:33:08 ---
One little note: If you compiled digiKam by yourself, try using "debug"
buildtarget instead of "debugfull". This will optimize the compiled code and
run much faster than the "debugfull" version.

This is a general rule for self-compiled code: Before measuring speed issues,
compile with optimizations, in digiKam's case by using the target "debug",
"relwithdebinfo" or "release".

The icon view isn't that complicated, so displaying some text shouldn't be a
problem :D I measured the code with callgrind and I can see no difference with
dimensions displayed.

It might be a graphics card driver issue in your case, I experienced such
problems some months ago, when the nVidia driver wasn't performing well.

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[Marcel Wiesweg]

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--- Comment #7 from Marcel Wiesweg <marcel wiesweg gmx de>  2009-07-20 15:11:06 ---
Really seems to be graphics stack related. Maybe "--graphicssystem raster"
helps, upgrading graphics driver or Qt version. Nothing from the digikam side
to do here.

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Andi Clemens <[hidden email]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |WONTFIX




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