Are there any plans for development of Qt-independent GIS core (with AGG
rendering engine, maybe)?
I don't know if AGG would be faster than the Qt raster paint engine and
how much. It would be very interesting to have the comparison AGG <-> Qt
raster engine (and maybe libcairo as well).
With AGG / cairo, the approach would be to create a new Qt paint engine
based on these libs (rather than changing the code in qgis core to be Qt
free). If someone knows of an AGG paint engine implementation or likes
to create one, that would be very interesting.
Regards,
Marco
On 20.11.2012 22:57, Tim Sutton wrote:
Hi
On Tue, Nov 20, 2012 at 11:26 PM, Marco Hugentobler
<[email protected]> wrote:
Not currently. By the way as far as I know the Arthur paint system in
Qt4 is based on AGG.
Afaik it is not based on AGG. The QImage rasterizer is based on the freetype
scan-converter.
There is an article about it
(http://blog.qt.digia.com/blog/2009/12/18/qt-graphics-and-performance-the-raster-engine/).
The authors of Qt seem to have considered building it on top of AGG first,
then decided that it is not a good idea (template based approach of AGG, too
many conversions).
Ah interesting, thanks for the correction Marco!
Regards
Tim
Regards,
Marco
On 20.11.2012 22:04, Tim Sutton wrote:
Hi
On Tue, Nov 20, 2012 at 4:30 PM, Олег Михалёв <[email protected]>
wrote:
Hi all,
I have one global question about QGIS.
What is the situation with the development of Quantum GIS Engine?
I mean non-gui classes built on the top of Qt framework, which are
responsible for spatial data management and rendering.
Ok so in our terminlogy that would be libqgis_core
Is there any active work on the significant improving of rendering
performance (http://hub.qgis.org/wiki/quantum-gis/Rendering_Performance)
or
redesign of QGIS Engine object model
The next main task is for Martin to merge his threading branch which
we hope will improve rendering performance somewhat. I also have some
ideas about using a compositing so that we can boost performance at
the possible expense of greater memory usage while rendering.
(http://hub.qgis.org/wiki/quantum-gis/Redesign_of_QGIS_data_model)?
Are there any plans for development of Qt-independent GIS core (with AGG
rendering engine, maybe)?
Not currently. By the way as far as I know the Arthur paint system in
Qt4 is based on AGG.
Looking through developer mailing lists of last years (2010-2012), I
haven't
found active discussion about the development of QGIS engine.
Is there another information about this topic?
Not formally that I can think of. Rendering performance in my opinion
should be the major focus of the 2.x release series - we have rich
functionality now but we need to deliver that quickly to the display
device or the user gets frustrated.
Regards
Tim
Oleg.
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==============================================
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Visit http://linfiniti.com to find out about:
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==============================================
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Dr. Marco Hugentobler
Sourcepole - Linux & Open Source Solutions
Weberstrasse 5, CH-8004 Zürich, Switzerland
[email protected] http://www.sourcepole.ch
Technical Advisor QGIS Project Steering Committee
_______________________________________________
Qgis-developer mailing list
[email protected]
http://lists.osgeo.org/mailman/listinfo/qgis-developer
--
Tim Sutton - QGIS Project Steering Committee Member (Release Manager)
==============================================
Please do not email me off-list with technical
support questions. Using the lists will gain
more exposure for your issues and the knowledge
surrounding your issue will be shared with all.
Visit http://linfiniti.com to find out about:
* QGIS programming and support services
* Mapserver and PostGIS based hosting plans
* FOSS Consulting Services
Skype: timlinux
Irc: timlinux on #qgis at freenode.net
==============================================
--
Dr. Marco Hugentobler
Sourcepole - Linux & Open Source Solutions
Weberstrasse 5, CH-8004 Zürich, Switzerland
[email protected] http://www.sourcepole.ch
Technical Advisor QGIS Project Steering Committee
_______________________________________________
Qgis-developer mailing list
[email protected]
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