[krita] [Bug 394061] Brush blobbing mid-stroke ink_gink_25 | archlinux | wacom cintiq 21ux

[vanyossi]

https://bugs.kde.org/show_bug.cgi?id=394061

vanyossi  changed:

   What|Removed |Added

 CC||ghe...@gmail.com

--- Comment #20 from vanyossi  ---
I had that problem with my intuos 2 pen after it fell to the ground tip first
:c.

The brush you attached works correctly on my genius tablet, There is no bubble
from "a little bigger step than the others". however I did play a little with
the settings and It might help to reduce the spikes to 2 (this makes no
difference in appearance in circular brushes) and also remove the "softness"
checkbox from the dynamics properties and achieve the softness from the curve
alone. Using softness dynamics on the soft engine produces a double halo on
some curves (Visible if you uncheck size and paint gently). the halo could
produce the effect you are seeing, but testing with the setup I have I could
not get any bubble.

you can try to see if the problem is the pen tablet information krita is
reading by toggling on the tablet logging "Ctrl + Shift + T". Analize the
output using this python tool @yoyobuae made(get it from here
https://twitter.com/yoyobuae/status/1013094034313801728 and running the tool as
instructed in the tweet). the curves will not be super smooth but the curve
should not have abrupt bumps. (I know you said it was not any hardware issue,
or driver. but it might have to do with processing speeds, only way to know is
to peek at what krita is seeing)

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[krita] [Bug 394061] Brush blobbing mid-stroke ink_gink_25 | archlinux | wacom cintiq 21ux

[Quiralta]

https://bugs.kde.org/show_bug.cgi?id=394061

--- Comment #19 from Quiralta  ---
(In reply to Loren Dias from comment #18)
> That's too bad. The problem is definitely in the brush engine and Krita
> itself.
> 
> The supplied .kpp performs one way on the old version and another on the new
> version.
> 
> The settings edit that I described was only a temporary workaround.

Hey, sorry if seems like it was closed for no reason, you can just reopen the
bug if you feel that there is something wrong with the default settings of the
brush, I understood that it was only when the settings were changed when the
issue would occur thus thought it was a matter of calibration.

But if what you are saying is that the brush (if you mean the "engine" then
every single pixel brush is also affected?) in its original state is having
issues. Please open the bug, and see if someone else is experiencing the same.
I still can't reproduce that behaving as mentioned in previous posts. Again,
sorry for closing prematurely. :)

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[krita] [Bug 394061] Brush blobbing mid-stroke ink_gink_25 | archlinux | wacom cintiq 21ux

[Loren Dias]

https://bugs.kde.org/show_bug.cgi?id=394061

--- Comment #18 from Loren Dias  ---
That's too bad. The problem is definitely in the brush engine and Krita itself.

The supplied .kpp performs one way on the old version and another on the new
version.

The settings edit that I described was only a temporary workaround.

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[krita] [Bug 394061] Brush blobbing mid-stroke ink_gink_25 | archlinux | wacom cintiq 21ux

[Quiralta]

https://bugs.kde.org/show_bug.cgi?id=394061

Quiralta  changed:

   What|Removed |Added

 Status|UNCONFIRMED |RESOLVED
 Resolution|--- |INVALID

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[krita] [Bug 394061] Brush blobbing mid-stroke ink_gink_25 | archlinux | wacom cintiq 21ux

[Quiralta]

https://bugs.kde.org/show_bug.cgi?id=394061

--- Comment #17 from Quiralta  ---
Loren, will close this now, as it seems is a matter of settings, if you feel
the settings should behave differently regardless, you can always bring the
topic to the forums, where the people behind the brush presets can give you
some tips/answers. :)

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[krita] [Bug 394061] Brush blobbing mid-stroke ink_gink_25 | archlinux | wacom cintiq 21ux

[giorgos]

https://bugs.kde.org/show_bug.cgi?id=394061

giorgos  changed:

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 CC||giorgosmoisiadi...@gmail.co
   ||m

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[krita] [Bug 394061] Brush blobbing mid-stroke ink_gink_25 | archlinux | wacom cintiq 21ux

[Quiralta]

https://bugs.kde.org/show_bug.cgi?id=394061

--- Comment #16 from Quiralta  ---
Based on your last screenshot I can tell you are not using the default curve
(or a least not the one in the Krita3-pack that comes included in later
versions.

I do can reproduce some "bubble" kind-of if I put little pressure (see my first
screenshot) but again that seems like spacing value (set at auto) and look at
the second screenshot set at 02, complete smoothness.

I would think that if this is the only preset you experience this, and only
when you modify it, then is not a bug, but simply a matter of finding the good
value for your tablet/pressure.

I do recommend to try other brushes and see if (in their original settings)
bring the problem. Also this will not be a issue either with the drivers, there
is no need to get rid of input-wacom as it brings more features to your tablet,
although evdev is pretty much history specially on distros like Arch where is
likely to go away sooner than expected.

First pic= shows bubbles and default settings for soft in mask type.
https://i.imgur.com/lA2Drk4.jpg

Second pic= shows no bubbles and changed spacing. (test strokes right under the
settings dialog)
https://i.imgur.com/fKNa0Nt.jpg

Sorry for the delayed response and I hope it helps you a little on how to sort
this out, if you feel is the personal customization that gets things "wonky"
and not a bug feel free to close as invalid :)

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[krita] [Bug 394061] Brush blobbing mid-stroke ink_gink_25 | archlinux | wacom cintiq 21ux

[Loren Dias]

https://bugs.kde.org/show_bug.cgi?id=394061

--- Comment #15 from Loren Dias  ---
Created attachment 112696
  --> https://bugs.kde.org/attachment.cgi?id=112696=edit
Brush Soft Mask Issue

I believe we have narrowed down the issue.

The issue only occurs when the the active brush (in this case gink_pen_25) has
a brush setting "Mask Type" of "Soft".

We have removed evdev and confirmed that the issue is not present on
krita-3.3.3-2 and confirmed that the issue follows the painttopresets pen by
resetting the ~/.local/share/krita profile aswell.

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[krita] [Bug 394061] Brush blobbing mid-stroke ink_gink_25 | archlinux | wacom cintiq 21ux

[Loren Dias]

https://bugs.kde.org/show_bug.cgi?id=394061

--- Comment #14 from Loren Dias  ---
@Quiralta I have attached the specific brush to this bug report incase that
helps.

I have uninstalled xf86-input-wacom and will see if the problem goes away.

I am unable to install libevdev. Archlinux comment says:

➜  ~ sudo pacman -Ss libevdev
extra/libevdev 1.5.9-1 [installed]
Wrapper library for evdev devices

I think it may directly wrap evdev to libinput for legacy and be required.

I will try each of your suggestions to see if I can narrow it down.

To try to reproduce please use a large canvas heavy document (~800 Megabytes
when opened) 1950 x 3232 @ 300 DPI.

I will report my progress.

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[krita] [Bug 394061] Brush blobbing mid-stroke ink_gink_25 | archlinux | wacom cintiq 21ux

[Loren Dias]

https://bugs.kde.org/show_bug.cgi?id=394061

--- Comment #13 from Loren Dias  ---
Created attachment 112554
  --> https://bugs.kde.org/attachment.cgi?id=112554=edit
Pen Preset -- install to: ~/.local/share/krita/paintoppresets/Ink_gpen_25.kpp

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[krita] [Bug 394061] Brush blobbing mid-stroke ink_gink_25 | archlinux | wacom cintiq 21ux

[Quiralta]

https://bugs.kde.org/show_bug.cgi?id=394061

Quiralta  changed:

   What|Removed |Added

 CC||rjquira...@gmail.com

--- Comment #12 from Quiralta  ---
I remember something like this way back (probably more than a year ago)and it
was present only when using some stabilizing or the dynamic brush.

Right now I can't reproduce this on my Arch/Plasma box, but for starters I
would suggest to remove evdev as libinput can handle tablets just fine. (unless
you use a device that strictly requires it).

Also make sure no curves where modified for either the brush or the pen,
unlikely but is worth to mention.

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[krita] [Bug 394061] Brush blobbing mid-stroke ink_gink_25 | archlinux | wacom cintiq 21ux

[Loren Dias]

https://bugs.kde.org/show_bug.cgi?id=394061

--- Comment #11 from Loren Dias  ---
Created attachment 112551
  --> https://bugs.kde.org/attachment.cgi?id=112551=edit
test-3-screenshot

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[krita] [Bug 394061] Brush blobbing mid-stroke ink_gink_25 | archlinux | wacom cintiq 21ux

[Loren Dias]

https://bugs.kde.org/show_bug.cgi?id=394061

--- Comment #10 from Loren Dias  ---
Created attachment 112550
  --> https://bugs.kde.org/attachment.cgi?id=112550=edit
test-3-video

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[krita] [Bug 394061] Brush blobbing mid-stroke ink_gink_25 | archlinux | wacom cintiq 21ux

[Loren Dias]

https://bugs.kde.org/show_bug.cgi?id=394061

--- Comment #9 from Loren Dias  ---
Created attachment 112549
  --> https://bugs.kde.org/attachment.cgi?id=112549=edit
test-3_krita-konsole-output-with-debugging-on

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[krita] [Bug 394061] Brush blobbing mid-stroke ink_gink_25 | archlinux | wacom cintiq 21ux

[Loren Dias]

https://bugs.kde.org/show_bug.cgi?id=394061

--- Comment #8 from Loren Dias  ---
Created attachment 112548
  --> https://bugs.kde.org/attachment.cgi?id=112548=edit
video of test #2

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[krita] [Bug 394061] Brush blobbing mid-stroke ink_gink_25 | archlinux | wacom cintiq 21ux

[Loren Dias]

https://bugs.kde.org/show_bug.cgi?id=394061

--- Comment #7 from Loren Dias  ---
Created attachment 112547
  --> https://bugs.kde.org/attachment.cgi?id=112547=edit
screenshot of test #2

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[krita] [Bug 394061] Brush blobbing mid-stroke ink_gink_25 | archlinux | wacom cintiq 21ux

[Loren Dias]

https://bugs.kde.org/show_bug.cgi?id=394061

--- Comment #5 from Loren Dias  ---
Created attachment 112545
  --> https://bugs.kde.org/attachment.cgi?id=112545=edit
xinput-list-props

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[krita] [Bug 394061] Brush blobbing mid-stroke ink_gink_25 | archlinux | wacom cintiq 21ux

[Loren Dias]

https://bugs.kde.org/show_bug.cgi?id=394061

--- Comment #6 from Loren Dias  ---
Created attachment 112546
  --> https://bugs.kde.org/attachment.cgi?id=112546=edit
$krita output

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[krita] [Bug 394061] Brush blobbing mid-stroke ink_gink_25 | archlinux | wacom cintiq 21ux

[Loren Dias]

https://bugs.kde.org/show_bug.cgi?id=394061

--- Comment #4 from Loren Dias  ---
Created attachment 112544
  --> https://bugs.kde.org/attachment.cgi?id=112544=edit
xinput

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[krita] [Bug 394061] Brush blobbing mid-stroke ink_gink_25 | archlinux | wacom cintiq 21ux

[Loren Dias]

https://bugs.kde.org/show_bug.cgi?id=394061

--- Comment #3 from Loren Dias  ---
Created attachment 112543
  --> https://bugs.kde.org/attachment.cgi?id=112543=edit
lsmod

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[krita] [Bug 394061] Brush blobbing mid-stroke ink_gink_25 | archlinux | wacom cintiq 21ux

[Loren Dias]

https://bugs.kde.org/show_bug.cgi?id=394061

--- Comment #2 from Loren Dias  ---
Created attachment 112542
  --> https://bugs.kde.org/attachment.cgi?id=112542=edit
Complete Archlinux package list ($pacman -Qe > ~/arch-linux-list.log)

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[krita] [Bug 394061] Brush blobbing mid-stroke ink_gink_25 | archlinux | wacom cintiq 21ux

[Loren Dias]

https://bugs.kde.org/show_bug.cgi?id=394061

--- Comment #1 from Loren Dias  ---
Created attachment 112541
  --> https://bugs.kde.org/attachment.cgi?id=112541=edit
Screen Recording of the bug

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