[krita] [Bug 378846] If canvas is zoomed out, brushes get very slow

[Tymond]

https://bugs.kde.org/show_bug.cgi?id=378846

Tymond  changed:

   What|Removed |Added

 Status|REPORTED|RESOLVED
 CC||tamtamy.tym...@gmail.com
 Resolution|--- |WORKSFORME

--- Comment #11 from Tymond  ---
@hibaguim...@gmail.com If you have issues with brushes, please go to one of the
user support forums first, either krita-artists.org, KDE forum:
https://forum.kde.org/viewforum.php?f=136 or reddit.com/r/krita . Do not reopen
bug reports that were determined to be invalid three years ago - it doesn't
make sense, your issue is probably very different, and if not, then it's a user
support issue, not a bug. If you're not sure, on the user support forum
supporters will help you with the process of reporting bugs or just help you
fix your issue. Thanks!

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[krita] [Bug 378846] If canvas is zoomed out, brushes get very slow

[idyia]

https://bugs.kde.org/show_bug.cgi?id=378846

idyia  changed:

   What|Removed |Added

 Status|RESOLVED|REPORTED
Version|git master  |4.2.8
   Platform|Other   |MS Windows
 OS|Linux   |MS Windows
 Resolution|WORKSFORME  |---

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[krita] [Bug 378846] If canvas is zoomed out, brushes get very slow

[idyia]

https://bugs.kde.org/show_bug.cgi?id=378846

idyia  changed:

   What|Removed |Added

 CC||hibaguim...@gmail.com

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[krita] [Bug 378846] If canvas is zoomed out, brushes get very slow

[Liz]

https://bugs.kde.org/show_bug.cgi?id=378846

Liz  changed:

   What|Removed |Added

 CC||thatalienthatta...@gmail.co
   ||m

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[krita] [Bug 378846] If canvas is zoomed out, brushes get very slow

[Boudewijn Rempt]

https://bugs.kde.org/show_bug.cgi?id=378846

--- Comment #10 from Boudewijn Rempt  ---
Yes, that's how the stabilizer works.

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[krita] [Bug 378846] If canvas is zoomed out, brushes get very slow

[Storm Engineer]

https://bugs.kde.org/show_bug.cgi?id=378846

--- Comment #9 from Storm Engineer  ---
I played around with Stabilizer. Unticking "scalable distance" made the lag go
away.

I'm just curious if it is normal behavior that it lags so much with scalable on
a large canvas.

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[krita] [Bug 378846] If canvas is zoomed out, brushes get very slow

[Storm Engineer]

https://bugs.kde.org/show_bug.cgi?id=378846

--- Comment #8 from Storm Engineer  ---
Yes I use smoothing but is it normal that it gets extremely laggy from zooming
out?

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[krita] [Bug 378846] If canvas is zoomed out, brushes get very slow

[Boudewijn Rempt]

https://bugs.kde.org/show_bug.cgi?id=378846

Boudewijn Rempt  changed:

   What|Removed |Added

 Resolution|--- |WORKSFORME
 Status|UNCONFIRMED |RESOLVED

--- Comment #7 from Boudewijn Rempt  ---
Dmitry says that either brush smoothing is enabled, which we cannot see because
the tool options palette is not visible in the video, or it's the way the brush
works -- smudge brushes are always slower than pixel brushes, especially if the
stroke gets longer (which happens here, because if you zoom out, you paint
along a longer path).

But there isn't much we can do with this report, I'm sorry to say. We're always
trying to make Krita perform better, but this doesn't point to any specific
place where we can change things.

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[krita] [Bug 378846] If canvas is zoomed out, brushes get very slow

[Storm Engineer]

https://bugs.kde.org/show_bug.cgi?id=378846

--- Comment #6 from Storm Engineer  ---
(In reply to Boudewijn Rempt from comment #3)
> Which opengl driver are you using? Looks like it has problems updating the
> projection.

Sorry for not answering, I simply forgot I made a ticket already. O_o Now I
found it...

I know nothing about OpenGL - I use the proprietary nvidia drivers, hopefuly
this is what you were asking. Installed packages (on Arch):

cuda 8.0.61-2
lib32-libvdpau 1.1.1-2
lib32-nvidia-utils 381.22-1
libvdpau 1.1.1-2
libxnvctrl 381.22-1
nvidia 381.22-4
nvidia-settings 381.22-1
nvidia-utils 381.22-1
opencl-nvidia 381.22-1


Krita settings:

OpenGL: Enabled
Filtering: Trilinear
Use texture buffer: Enabled


I also added some images demonstrating the issue.

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[krita] [Bug 378846] If canvas is zoomed out, brushes get very slow

[Storm Engineer]

https://bugs.kde.org/show_bug.cgi?id=378846

--- Comment #5 from Storm Engineer  ---
Created attachment 106495
  --> https://bugs.kde.org/attachment.cgi?id=106495=edit
Comparison of zoom levels with a 1000 by 1000 test image

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[krita] [Bug 378846] If canvas is zoomed out, brushes get very slow

[Storm Engineer]

https://bugs.kde.org/show_bug.cgi?id=378846

--- Comment #4 from Storm Engineer  ---
Created attachment 106494
  --> https://bugs.kde.org/attachment.cgi?id=106494=edit
Demonstration of issue

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[krita] [Bug 378846] If canvas is zoomed out, brushes get very slow

[Boudewijn Rempt]

https://bugs.kde.org/show_bug.cgi?id=378846

Boudewijn Rempt  changed:

   What|Removed |Added

 CC||b...@valdyas.org

--- Comment #3 from Boudewijn Rempt  ---
Which opengl driver are you using? Looks like it has problems updating the
projection.

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[krita] [Bug 378846] If canvas is zoomed out, brushes get very slow

[Storm Engineer]

https://bugs.kde.org/show_bug.cgi?id=378846

--- Comment #2 from Storm Engineer  ---
(In reply to Raghavendra kamath from comment #1)
> Can you please specify steps to reproduce this. The size of the canvas and
> name or typeof brush preset would be a good information.

I recorded a video demonstrating the issue. Here is a Dropbox link to that,
plus the brush I used, the test file and my kritarc:
https://www.dropbox.com/sh/522okznrywfy7b9/AAB2g9rJFHs60BuWkodiz-MYa?dl=0

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[krita] [Bug 378846] If canvas is zoomed out, brushes get very slow

[Raghavendra kamath]

https://bugs.kde.org/show_bug.cgi?id=378846

Raghavendra kamath  changed:

   What|Removed |Added

 CC||raghavendr.ra...@gmail.com

--- Comment #1 from Raghavendra kamath  ---
I am on arch linux plasma 5 with krita built from source. I couldn't reproduce
the issue. I could paint with small brush on a relatively large canvas 7k X 7k
with ease and without any noticeable delay in zoomed out canvas as compared
zoomed in one.

Can you please specify steps to reproduce this. The size of the canvas and name
or typeof brush preset would be a good information.

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