Hi,
some months ago we discussed the idea of having a background color in SLD
to replace
the need for a "giant layer" crutch, as used by GeoServer NY map as well as
MBStyle translator:
http://osgeo-org.1560.x6.nabble.com/Setting-the-map-background-color-in-the-style-small-change-from-OGC-Testbed-15-td5415921.html

I did not get to implement it, and now got back as a way to get good
support for background in MBStyle.
Compared to the thread, Style will contain a single new Background element,
which happens to be ... a Fill!
It's actually the most natural approach in my opinion, the fill covers all
we need, including opacity control,
expressions and env variables, backgrounds made of repeated images and so
on.

Here is a proof of concept PR that I hope to complete in the next few days:
https://github.com/geotools/geotools/pull/2775

I believe it slots in quite nicely and simplifies things in MBStyles too.
The plan is to complete it, by adding support for the gt-xsd SLD
parsers/encoders, and a bit of docs.

As a replacement for "giant polygon" I won't be implementing support for
interaction with the WMS bgcolor spec,
when the background is set, it's solid, as if the source was opaque.
Support for eventual interaction and override
can be implemented later.

Same goes for background support for other styling languages, that will
come as the respective module maintainers
find time to get it done.

Feedback appreciated.

Cheers
Andrea

==

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