[Qgis-developer] QGIS Engine development

[Tim Sutton]

Hi

On Tue, Nov 20, 2012 at 11:26 PM, Marco Hugentobler
<marco.hugentobler at sourcepole.ch> 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 <mihis.sakh at gmail.com>
>> 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.
>>>
>>> _______________________________________________
>>> Qgis-developer mailing list
>>> Qgis-developer at lists.osgeo.org
>>> 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
>> ==============================================
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>
>
>
> --
> Dr. Marco Hugentobler
> Sourcepole -  Linux & Open Source Solutions
> Weberstrasse 5, CH-8004 Zürich, Switzerland
> marco.hugentobler at sourcepole.ch http://www.sourcepole.ch
> Technical Advisor QGIS Project Steering Committee
>
>
> _______________________________________________
> Qgis-developer mailing list
> Qgis-developer at lists.osgeo.org
> 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
==============================================