On Sun, Feb 15, 2015 at 3:05 AM, Jody Garnett <jody.garn...@gmail.com>
wrote:
>
> Long story short, a layer parallel renderer seems suitable for desktop
>> usage (where you have one request at a time, and 8-16GB of memory to play
>> with),
>>
>> Agreed, hence my interest in taking part on behalf of the uDig project.
>
Ah yep. It will be good to get some help in rendering land from the uDig
project again, Jesse is certainly missed there :-)
>
> As for experience/observation - one way to approach the distribution is
> focus on allowing direct layer to fed the preprocesse style objects (so
> they do not end up duplicating SLD processing logic). If we go that way I
> would like to consider the multi-threaded case at the same time.
>
I guess we might end up having to take apart the StreamingRenderer into a
set of utility/helper classes, and then rebuild the current two threads
approach as on renderer, and a parallel one
as a second implementation, having all in one might become unmanageable...
>
> I have not thought clearly through the consequences of the color-blending
> changes for GeoTools 13, in addition to FeatureTypeStyle there is now
> greater control of composition available.
>
Not much of a change in StreamingRenderer because of compositing, we just
allocate extra drawing surfaces when the composite-base vendor option
is used (something we were doing already for multiple FTS on the same layer
anyways), and then instantiate the right java2d Composite object
when merging them back.
The two commits in question are the following (should be pointing at the
portion of the change involving StreamingRenderer):
https://github.com/geotools/geotools/commit/b9bb756ff4f9a651fcb96f4e1b7e22b0b9ba3c50#diff-0c2a1d63c591affa14372de83ef72814
https://github.com/geotools/geotools/commit/c960f3396c73ed17f896edbd0659678b6156d9fe#diff-0c2a1d63c591affa14372de83ef72814
Cheers
Andrea
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