[Qgis-developer] Moving forward with the raster transparency branch

[Marco Hugentobler]

Hi Peter,

> Has this been done already for the vector layers? Do you have any
> example available that I can take a look at?

Unfortunately not, it was just a discussion with Martin on the developer list 
(see http://lists.qgis.org/pipermail/qgis-developer/2007-August/002340.html 
and ...002341.html and 
http://lists.qgis.org/pipermail/qgis-developer/2007-September/002355.html)

For vector, thread safety would involve quite some redesign. So if redesign is 
done for raster layer anyway, it would be good to consider thread safety too.

Regards,
Marco

On Tuesday 25 September 2007 03:00:45 Peter Ersts wrote:
> Thanks Marco,
>
> Has this been done already for the vector layers? Do you have any
> example available that I can take a look at?
>
> thanks
> -pete
>
> Marco Hugentobler wrote:
> > Hi Peter,
> >
> > Another comment about the refactoring of raster layer:
> > It would be good if thread safety could be another criterion for the
> > raster redesign. That means that member variables describing the
> > iteration state in providers should be separated into an iterator object.
> > Martin and I discussed this for vector layers on the mailing list. As
> > there is raster refactoring anyway, it would be good to consider this
> > point as well. Hopefully, at some point in future, qgis may benefit from
> > the capabilities of multicore cpus.



-- 
Dr. Marco Hugentobler
Institute of Cartography
ETH Zurich
Technical Advisor QGIS Project Steering Committee
marco.hugentobler at karto.baug.ethz.ch