Bug 251543

Summary: Brush strokes lag after each stroke... but only on some windows
Product: [Applications] krita Reporter: Kubuntiac <user581>
Component: GeneralAssignee: Adam C <bugs_kde_org2>
Status: RESOLVED FIXED    
Severity: normal CC: bugs_kde_org2, Venola7
Priority: NOR    
Version First Reported In: git master (please specify the git hash!)   
Target Milestone: ---   
Platform: Ubuntu   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:
Attachments: Drawing_results

Description Kubuntiac 2010-09-17 10:16:51 UTC 
Version:           svn trunk (using KDE 4.5.1) 
OS:                Linux

When cross hatching manually, that is drawing many small lines quickly, sometimes some Krita windows will seem to have a lag at the end of each stroke. This means that anything after the first stroke is not drawn properly.

It's not a general computer speed issue, as I can open a second window and it will work fine. Drawing in the scratchpad also works fine.

See a screen recording demonstrating the above here:
http://blip.tv/file/4130432
(can be viewed in ogv / HTML5)

Reproducible: Sometimes

Steps to Reproduce:
1. Draw a number of lines quickly, one after the other


Actual Results:  
1. The first one draws perfectly, but after that lines are not drawn properly
2. If you pause, that the next line will be drawn properly
3. If the file is saved, closed and re-opened the problem goes away (temporarily)

Expected Results:  
1. All lines are painted without lag

OS: Linux (i686) release 2.6.32-24-generic-pae
Compiler: cc
Revision: 1176097
Comment 1 Kubuntiac 2010-09-17 10:17:41 UTC 
Aditionally... in that video, both windows have the same resolution, the same (pixel) brush with the same diameter and the same number of layers.
Comment 2 Adam C 2010-09-17 12:16:49 UTC 
this is probably due to recalculating image colours.

i have committed a patch to make it better in rev 1176310 and 1176311. now i'm going to move the calculation to the background - well, try at least.
Comment 3 Adam C 2010-09-28 13:47:57 UTC 
this should be fixed now. if it returns, please reopen.
Comment 4 Venola Brooks 2016-11-09 16:43:49 UTC 
Created attachment 102147 [details]
Drawing_results

This shows the results with the wacom tablet