please test master ( -> performance topic)

[David Revoy]

Hi,

Thanks for your work Boud about performances. I *really* appreciate all 
the work that could be done in this direction. This is the most 
important topic in my opinion for Krita ( this and of course polishing 
existing features , as text / navigation / textures / etc... ) I tested 
a before / after the change ; using a set of rules* I'm used to do for 
comparing digital painting apps. I saw a very subtle advantage in openGL 
( but maybe it also comes from the Nvidia updates ) like 1/10 better. 
This mainly affect brush with smudge/dulling. For the no-openGL canvas ; 
I experienced no changes.

Here I also installed a dual boot with a Win7 to test performances 
differences between four digital painting softwares** and Krita. The 
difference is like going from 1 to 5. Watching this statement was a bit 
hard, and make me sad for the slow FLOSS tools.

Where all the computing effort of my hardware goes ? :-)
I can't barely demo Krita on my laptop , a dual core 2Ghz , 3GB of ram 
for painting smoothly a 2484x1200pixel concept art previz at 50% of 
viewport. For performing this, I must use my workstation , a icore7 
2,3Ghz , with a Nvidia GT220 and 8Gb ram ; and I'm happy I can, but it's 
exclude a lot of user also.

Of course, I'm deeply aware than back in 2009 while doing concept for 
Sintel, Krita couldn't paint smoothly on a 1000x1000px canvas with the 
simpliest rounded brush***. A long and wondefull road was made, there is 
not a single doubt about it, and thanks to all developers involved into 
this field. But , I think you'll understand it is reasonable to ask 
Krita to be five time more fast.

I'm also aware than tweaking the deep engine of Krita is not a little 
work , and rare people can do it. I assume it's also a no-fun job, 
complex. Developer(s) on this task should be paid for to can invest full 
time on it.
Community could contribute around with a fund rising about that , as in 
2009 again ***.

-David


( * personnal set of rules : my test is only about how it feels to paint 
a sketch with various brush on a A4-300dpi ; at 25% view port zoom , 
with large brush ; I repeat the test on a multiply layer ; under the 
multiply layer ; merging layers speed ; and color action as 'level' / 
'hue/sat" change ... for the brush I use a simple hard rounded with no 
visible 'spacing' and pressure on opacity ; and also brush mask ; and 
also brushmask + dulling or smudging ; I'm used to judge software like 
that ... it's a sort of my personnal calibration to how get how a 
software feels. )

(** digital painting softwares tested on Win7 : last OpenCanvas , Corel 
Painter 12 , SAI Tools , Photoshop CS2 )

(*** 2009 story : 
http://dot.kde.org/2009/12/02/krita-team-seeking-sponsorship-take-krita-next-level 
, can't a similar fund rising be done again ? )






On 08/30/2012 09:06 AM, Boudewijn Rempt wrote:
> Hi,
>
> After a deep discussion last night I've pushed an experiment patch to 
> master that should improve painting performance a bit (not a huge 
> amount, but still useful). However, I really need to know whether it 
> causes regressions.
>
> So, if you're using git master, please update and report on issues 
> when painting, especially with low opacity strokes and undo/redo or 
> other brushes than the pixel brush. Issues can only appear when 
> painting in wash mode, not build-up mode.
>
> Thanks!
>
> Boudewijn
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