Bug 364406

Summary:	Brush tip lags and gets stock after each stroke
Product:	[Applications] krita	Reporter:	Quiralta <rjquiralte>
Component:	Brush engines	Assignee:	Krita Bugs <krita-bugs-null>
Status:	RESOLVED FIXED
Severity:	major	CC:	alvin, halla, storm.anthro
Priority:	NOR
Version:	git master (please specify the git hash!)
Target Milestone:	---
Platform:	Arch Linux
OS:	Linux
URL:	https://drive.google.com/file/d/0B-cDWUXy4ZMmNm40LWNUZnl4U3M/view?usp=sharing
Latest Commit:		Version Fixed In:

Description Quiralta 2016-06-17 04:45:00 UTC

A mentioned this one earlier, I also went through some other bugs but they are not necessarily the same (if related I can't tell though) (see attached video).

There is a lag after each stroke but also the preset gets "stock" its position and pressure, thus at times simply doesn't draw, or connects the last stroke (straight line shown at the beginning of the strokes in the video) or it delays the pressure making a very short stroke like "dots".

Currently happening only on the build version of Krita, I am on a Archlinux system with a nvidia propietary drivers.

After reading Eliotj and Raghavendra kamath's details on the bug https://bugs.kde.org/show_bug.cgi?id=362445 I don't think there is much relation to the issues, I experience this issue regardless of the freehand brush settings (smoothing/stabilizer or non) or the texture framebuffer been on / off,

Also this one seems very similar but I don't see the presset pressure and position getting stock in the video shown here https://bugs.kde.org/show_bug.cgi?id=363799#add_comment

This affects freehand and dynamic brush tools, even with the assistant tool.

Reproducible: Always

Steps to Reproduce:
1. Launch Krita
2. Make a new document or open an existing one.
3. Try to draw

Actual Results:  
Lag / presets pressure/position will get stock.

Expected Results:  
Brush tools normal behavior.

Comment 1 Halla Rempt 2016-06-18 08:23:19 UTC

Yes, this is caused by the historgram docker taking cpu even when it's hidden. It should use some kind of timer or event compression to minimize cpu usage & not do anything when it's hidden.

Comment 2 Halla Rempt 2016-06-18 08:24:55 UTC

Oops, added to the wrong bug. Are you building krita from source? If so, I suspect it is the histogram bug, though.

Comment 3 Halla Rempt 2016-06-18 11:01:46 UTC

Git commit 5145d9ded72c354e04c0013ce815d9fd0eede8e0 by Boudewijn Rempt.
Committed on 18/06/2016 at 11:01.
Pushed by rempt into branch 'master'.

Disable the histogram docker for now

Until https://bugs.kde.org/show_bug.cgi?id=364406 is fixed krita is
unusable with the histogram docker. People using master may have
to remove the .so from lib/kritaplugins

M  +1    -1    plugins/dockers/histogram/CMakeLists.txt

http://commits.kde.org/krita/5145d9ded72c354e04c0013ce815d9fd0eede8e0

Comment 4 Storm Engineer 2016-06-18 21:05:43 UTC

*** Bug 364283 has been marked as a duplicate of this bug. ***

Comment 5 Storm Engineer 2016-06-18 23:44:22 UTC

I have the exact same symptoms as described here, also on Arch. I marked my ticket as a duplicate of this one.

I built fresh, and after I deleted the corressponding .so files the issue is gone so I can confirm it's caused by the histogram.

Comment 6 Quiralta 2016-06-19 04:12:21 UTC

(In reply to Boudewijn Rempt from comment #3)
> Git commit 5145d9ded72c354e04c0013ce815d9fd0eede8e0 by Boudewijn Rempt.
> Committed on 18/06/2016 at 11:01.
> Pushed by rempt into branch 'master'.
> 
> Disable the histogram docker for now
> 
> Until https://bugs.kde.org/show_bug.cgi?id=364406 is fixed krita is
> unusable with the histogram docker. People using master may have
> to remove the .so from lib/kritaplugins
> 
> M  +1    -1    plugins/dockers/histogram/CMakeLists.txt
> 
> http://commits.kde.org/krita/5145d9ded72c354e04c0013ce815d9fd0eede8e0

Thanks for the information, it does work for me too to delete the histogram .so files.

@Storm Engineer Thanks for confirming

Comment 7 Halla Rempt 2016-06-22 15:05:46 UTC

The histogram docker will remain disabled until Eugene fixed this issue.

Comment 8 Halla Rempt 2016-06-24 06:20:27 UTC

Git commit 6317a16df535ff1245ac2a7bf72e12a0fc477efe by Boudewijn Rempt.
Committed on 24/06/2016 at 06:07.
Pushed by rempt into branch 'krita/3.0'.

Disable the histogram docker for now

Until https://bugs.kde.org/show_bug.cgi?id=364406 is fixed krita is
unusable with the histogram docker. People using master may have
to remove the .so from lib/kritaplugins

M  +1    -1    plugins/dockers/histogram/CMakeLists.txt

http://commits.kde.org/krita/6317a16df535ff1245ac2a7bf72e12a0fc477efe