[QGIS-Developer] Incremental drawing possible?

[Neumann, Andreas]

Hi, 

I tested it on Linux with WMTS and Postgis layers. It worked fine for
it. I would like to test it on Windows as well, but I can't compile it
on Windows .... if it would be in master, I could test the nightlies. 

Performancewise it worked fine on Linux. 

I am not so sure, if it should be enabled for WMS layers, because there
would most likely be issues with labels ... if there would be additional
tiles at the previous canvas border. I think for WMS the user should be
able to decide whether he wants to enable/disable. It may make sense for
unproblematic layers (e.g. Orthoimages) - but anything with dynamic
labels may have issues. But I think it is disabled for WMS anyway,
currently. 

Andreas 

On 2017-07-12 00:57, Nyall Dawson wrote:

> On 12 July 2017 at 06:21, Andreas Neumann <a.neumann at carto.net> wrote: 
> 
>> Hi Nyall,
>> 
>> I compiled your branch / pull request. Quite impressive! I like it.
>> 
>> Is it planned to land in master, or are there issues with this improvement?
> 
> Well - from my use case I consider it ready. But there's some
> outstanding questions which need solving (see the PR discussion):
> 
> - should this be normal behavior?
> - should it be enabled for all layer types? wmts only (as per
> sourcepole's original implementation)? local layers only (for those of
> us on crap/expensive internet connections)? rasters only? vectors
> only?
> - is the cpu utilisation for rendering these possibly unseen tiles an
> issue? or is cpu use so cheap nowdays that it's not a factor?
> - should the rendering of the adjacent tiles only begin when a pan
> starts? (would lose the zoom out benefits this brings, plus add a
> delay in showing the nearby area when pan starts)
> 
> My 2c: just enable it for everything and let everyone get the benefits
> without any configuration hassle. But... all my workstations are at
> least 4 cores and lots of memory. So I'm probably not in the best
> position to make this call ;)
> 
> Nyall
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