[Qgis-developer] QGIS Engine development

[Marco Hugentobler]

>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).

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.
>>
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>>
>
>
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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