Bug 137803

Summary: MNG display problems (flicker, slow draw)
Product: [Applications] konqueror Reporter: Stephan Sokolow <kde_bugzilla_2>
Component: khtml image partAssignee: Simon Hausmann <hausmann>
Status: RESOLVED WORKSFORME    
Severity: normal CC: caionnew
Priority: NOR    
Version: unspecified   
Target Milestone: ---   
Platform: unspecified   
OS: Linux   
Latest Commit: Version Fixed In:

Description Stephan Sokolow 2006-11-24 03:39:06 UTC 
Version:           3.5.5 (using KDE 3.5.5, Gentoo)
Compiler:          Target: i686-pc-linux-gnu
OS:                Linux (i686) release 2.6.17-gentoo-r4-20060825

Most of the "non-animated animation" tests (as well as the "basic MNG functions" test) at http://www.libmng.com/MNGsuite/ result in at least one of the displayed images flickering constantly.

Also, the "promote" tests (which use a grid of PNG samples and then an equivalent grid of MNGs) draw their MNG grids so slowly that it's painful to watch and then wipe them and start over.

I'm using libmng 1.0.9 according to my packager, so unless KDE or Qt use an internal libmng, it's not the libmng-1.0.4 bugs warned about at the top of the page.
Comment 1 Maksim Orlovich 2006-11-24 04:59:44 UTC 
Qt can be built with internal libmng, and 3.3.6 appears to come with 1.0.4
 

ldd libqmng.so in plugins/imageformats under the directory where Qt is installed and see if it's linking to an external libmng
Comment 2 Stephan Sokolow 2006-11-24 08:15:53 UTC 
According to locate, the only libqmng.so on my system is the copy that Qt 4 is providing. (I've got one or two apps which require Qt 4 so I'm running with both Qt 3 and Qt 4 installed)
Comment 3 Martin Fitzpatrick 2007-01-17 00:14:32 UTC 
Unable to confirm this on KDE 3.5.5 / Kubuntu 6.10. Although Konq fails a lot of the tests, they draw quickly & without flicker. Could this be a video driver issue?
Comment 4 Stephan Sokolow 2007-01-17 07:23:24 UTC 
I have no idea... but if it is, then I DEFINITELY want to figure out how to solve it since I'll be switching from nVidia TwinView to a hybrid TwinView+Xinerama setup within a few days (I bought a couple of 19" LCDs and I'm planning to keep one of my CRTs as a third monitor) and my system is slow enough as it is. (A 2Ghz Celeron when I could easily overtax a 4Ghz+ Athlon64)

For the record, I'm using the 9746 release of the nVidia binary drivers.