A Lighter, Faster (?) Plasma - Regenerated

[Rog132]

Regenerated > Topic: Lost Information, old topic=3105059.0


The First Round

The Qt (Qt 4.5 or later) has an option to use different graphics system to draw the desktop objects > QApplication Class Reference:

...
All Qt programs automatically support the following command line options:-graphicssystem, sets the backend to be used for on-screen widgets and QPixmaps. Available options are raster and opengl.
...
...which will be used for on-screen widgets and QPixmaps. The available systems are "native", "raster" and "opengl".

True Believers & Heathens a.k.a should we or shouldn't we > Qt 4.5 RC1 packages for Intrepid, built with -graphicssystem raster

> Kubuntu-devel >> graphicssystem raster:

Scott Kitterman
Sat Jul 11

At UDS we had some discussion about switching to raster would make Kubuntu a
lot faster.

Did anyone do anything on this? Faster is important ....

Scott K

There's no such thing as a free meal > graphicssystem raster:

Jonathan Thomas
Tue Jul 14 03:26:19 BST 2009
...
Yes, it would make things faster, however it also greatly increases RAM
consumption since everything is being rendered in software.
Here's the result of a quick benchmark on my part:...

[Rog132]

Re: A Lighter, Faster (?) Plasma - Regenerated

The Second Round


> KCM Qt Graphics System:

Description:
This KCM allows you to easily configure the standard Qt graphics system.

[img width=400 height=252]http://kde-apps.org/CONTENT/content-pre1/129817-1.jpeg[/img]


> Ubuntu Packages Search >> Package: kde-config-qt-graphicssystem:

configuration module for the Qt graphics system backend

Using this module you can configure the default graphics system backend to be used by Qt. Supported are X11, raster and OpenGL.

kubicle « Reply #9 on: September 07, 2010, 08:54:04 am » :

Tip: if fiddling with the backend renders your desktop unusable (at least the opengl backend can do that) you can fall back on the default backend by removing ~/.kde/env/qt-graphicssystem.sh

kubicle « Reply #12 on: September 07, 2010, 10:56:00 am »:

And you don't really need the config module to test different graphics backend (provided you have qt 4.7, that supports setting the graphicssystem via environment variable).

For example, to test the raster backend, just create a file ~/.kde/env/qt-graphicssystem.sh (although the name shouldn't really matter) with the contents:
export QT_GRAPHICSSYSTEM=raster
and relog into kde.

[Rog132]

Re: A Lighter, Faster (?) Plasma - Regenerated

The Third Round


> UDSProceedings N PackageSelectionAndSystemDefaults::

Kubuntu Packaging

Notes
...

* Thiago says should be fine to turn on Qt raster painting for everything, will be default in 4.8 anyway

...

> Kubuntu Todo - Natty:

...
Turn on raster for Qt for an alpha
...

> About kubuntu-devel
> Qt raster on by default:

Jonathan Riddell
Wed Nov 17 17:40:14 GMT 2010

I uploaded kubuntu-default-settings which sets export
QT_GRAPHICSSYSTEM=raster

Do test it out and see if it causes any problems.

Openoffice won't start unless you set QT_GRAPHICSSYSTEM=native
we'll need to patch it to do that by default

Jonathan

QT_GRAPHICSSYSTEM=native ooffice
QT_GRAPHICSSYSTEM=native ooffice -writer
...

[img width=400 height=338]http://img684.imageshack.us/img684/3527/nativel.jpg[/img]


> About Natty-changes
> kubuntu-default-settings 1:11.04ubuntu1:

kubuntu-default-settings (1:11.04ubuntu1) natty; urgency=low

* Add etc/X11/Xsession.d/80qtgraphicssystem to set default graphics
system for Qt to raster
...

> kubuntu-default-settings 1:11.04ubuntu3:

...
[ Jonathan Thomas ]
* Remove etc/X11/Xsession.d/80qtgraphicssystem, as upstream has
reported it to cause "havoc" with the intel drivers

Natty/Qt > Topic: Notty links

[Rog132]

Re: A Lighter, Faster (?) Plasma - Regenerated

The Forth Round

> Kubuntu Packaging for Oneiric:

* Qt 4.8 will be out in a month or two
...
- Raster is the most tested and recommended graphicssystem, we should try enabling it by default again...

[woodsmoke]

Re: A Lighter, Faster (?) Plasma - Regenerated

interesting reading, thanks
woodsmoke

[schnelle]

Re: A Lighter, Faster (?) Plasma - Regenerated

Thanks for information Rog! I am using raster now and WOW (!!!) what a difference!

Whole system is much more responsive, windows are rendered much faster and desktop effects are more smooth

[Rog132]

Re: A Lighter, Faster (?) Plasma - Regenerated

> Kubuntu Developer Discussion
> Qt raster graphics system by default:

Harald Sitter
Sun Jun 26 10:52:13 UTC 2011

Salut!

The raster system is as of kubuntu-default-settings 11.10ubuntu2 used
again as default graphics system for Qt. We had this already in natty
but reverted as there were some issues (with plasma-netbook, kwin and
rekonq). As Qt 4.8 will switch to raster as the one and only superior
graphics system, it seems worthwhile that we give it a shot once more.
Especially since upstream needs QA for it anyway.

Should you notice obscure rendering bugs with oneiric please report a
bug against qt4-x11 and assign it to me AND subscribe me.

Once we have landed KDE 4.7 at least the KWin side of things should be
fixed WRT raster, so there is hope for raster qualifying as default
this time around

regards,
Harald

> Oneiric-changes
> [ubuntu/oneiric] kubuntu-default-settings 1:11.10ubuntu2 (Accepted):

kubuntu-default-settings (1:11.10ubuntu2) oneiric; urgency=low

* Reintroduce 80qtgraphicssystem to set raster system for testing once more
In Qt 4.8 raster will be the default rendering system, thus KDE needs to
work well with it. To ensure this we need testing ASAP. Should all
issues (if any) get resolved, we'll switch Qt at compile time.

[MoonRise]

Re: A Lighter, Faster (?) Plasma - Regenerated

Great to hear! I have to say Raster does seem smoother especially on my laptop!

[Guest]

Re: A Lighter, Faster (?) Plasma - Regenerated

Raster is rather zippy. Thanks for the info!

[OneLine]

Qt 4.8 / Precise

https://lists.ubuntu.com/archives/pr...ry/009798.html

Remove /etc/X11/Xsession.d/80qtgraphicssystem since Qt 4.8 uses the raster graphics system by default.