Bug 241799

Summary:	Digikam: marked images makes scrolling slow
Product:	[Applications] digikam	Reporter:	Thomas Damgaard <thomasdn>
Component:	Albums-MainView	Assignee:	Digikam Developers <digikam-bugs-null>
Status:	RESOLVED FIXED
Severity:	normal	CC:	caulier.gilles, thomasdn
Priority:	NOR
Version:	1.2.0
Target Milestone:	---
Platform:	Ubuntu
OS:	Linux
Latest Commit:		Version Fixed In:	5.1.0
Sentry Crash Report:

Description Thomas Damgaard 2010-06-15 09:16:47 UTC

Version:           1.2.0 (using KDE 4.2.2) 
OS:                Linux

When I have multiple images marked in an album, scrolling down/up becomes very slow. It seems that Digikam repaints all the marked thumbnails several times while scrolling (they blink), while the unmarked thumbnails are not redrawn (does not blink during scroll).



Reproducible: Always

Steps to Reproduce:
 * Open Digikam
 * Go to an album with several images (mine had a few hundred)
 * Scroll up and down
 * Take note of the responsiveness while scrolling.
 * Now, mark half of them by dragging a rectangle with the mouse
 * Use the scroll wheel to scroll down.
 * Note that the scrolling is much more unresponsive than without images marked.

Actual Results:  
Scrolling becomes slow

Expected Results:  
Scrolling with marked images should be just as fast as with no images marked.

I use Kubuntu 10.04 with nouveau driver.
Hardware is:
Thinkpad T61p
2.5 GHz Core 2 Duo
4 GB RAM
Linux malbec 2.6.32-22-generic #36-Ubuntu SMP Thu Jun 3 22:02:19 UTC 2010 i686 GNU/Linux

Comment 1 Thomas Damgaard 2010-06-15 09:18:08 UTC

I have just tried this on a folder with several very small images (ca. 600x600 jpegs) and there is no problem with them. So it seems to depend on the size of the images marked.

Comment 2 caulier.gilles 2010-06-15 09:20:13 UTC

Never seen a dysfunction like this. Sound like a problem with your X server installation or something like that... What's your graphic card ? Which driver you use ?

Gilles Caulier

Comment 3 Thomas Damgaard 2010-06-15 09:33:57 UTC

Gilles, my graphics card:
01:00.0 VGA compatible controller: nVidia Corporation Quadro FX 570M (rev a1)

I can try with the nvidia-glx driver, when I get home later today.

Comment 4 caulier.gilles 2010-06-15 09:42:45 UTC

I remember some old NVidia dysfunction with KDE4. If you can try to use ATI card. Drivers sound better under Linux.

Gilles Caulier

Comment 5 Thomas Damgaard 2011-06-24 08:19:18 UTC

2011/6/24 Matt Rogers <mattr@kde.org>:
> --- Comment #4 from Gilles Caulier <caulier gilles gmail com>  2010-06-15 09:42:45 ---
> I remember some old NVidia dysfunction with KDE4. If you can try to use ATI
> card. Drivers sound better under Linux.

Unfortuneately, I do not have access to an ATI card at the moment.

Comment 6 caulier.gilles 2011-12-14 09:29:02 UTC

Thomas,

This file still valid using digiKam 2.x serie ?

Gilles Caulier

Comment 7 caulier.gilles 2013-11-25 17:01:38 UTC

Thomas,

This file still valid using digiKam 3.5.0 release ?

Gilles Caulier

Comment 8 caulier.gilles 2015-06-30 08:05:12 UTC

New digiKam 4.11.0 is available :

https://www.digikam.org/node/740

Can you reproduce the problem with this release ?

Comment 9 caulier.gilles 2016-07-14 17:05:43 UTC

With digiKam 5.0.0  this problem is not reproducible.
I close this file now. Don't hesitate to re-open if necessary.
Gilles Caulier