[Qgis-developer] Re: Improving rendering speed

[Gavin Macaulay]

Hi,

I think that the problem with QImage will be a very similar problem as 
with X11, but is most likely to now extend to other platforms :(

QPainter has the ability to set a clip region, and this may be a way to 
get Qt to do the clipping, although I seem to remember trying this in 
Qt3. However in the end someone has to do the clipping, and whether it's 
Qt or Qgis should really only depend on which code can do it fastest. 
I'll try a clip region on QPainter later tonight.

Gavin

Martin Dobias wrote:
> I've updated that wiki page - with regard to Gavin's testing, there's
> still need of clipping features. Currently not due bug in X11 but
> because of bug in Qt - in rasterizer for QImage. This will probably
> affect also other platforms, not only X11. Please could someone test
> it on the other platforms?
> 
> Martin
> 
> 
> On 3/18/06, Martin Dobias <wonder.sk at gmail.com> wrote:
>> Hi,
>>
>> I've started to do some research on how to make rendering faster. My
>> benchmarks and thoughts on optimizing are on wiki:
>> http://wiki.qgis.org/qgiswiki/Rendering_Performance
>>
>> I'd like hear some feedback from you!
>>
>> Bye,
>> Martin
>>
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