[Tile-serving] Real time tile merging strategy

[sly (sylvain letuffe)]

Hi kai,

> Well, it sort of does go through, but the the updating and rendering
> request logic only supports requesting one set of tiles. With the
> current abstraction model, there is no way to pass through two rendering
> requests. Therefore it mostly works for one dynamic layer and one static
> fully rendered layer. So it is sort of ideal for compositing hillshading
> into a standard tile layer, but less ideal for other purposes.

This is maybe why it isn't best to implement this feature at the storing layer 
level.
I would bet that most people don't have a fully rendered layer (at least I 
don't).


> Please let me know if it works for you Sylvain.

I'm stuck on :
ERROR: init_storage_ro_coposite: Support for compositing storage has not been 
compiled into this program

Looks like it needs some lib named "cairo" I seam to have, but unfound by the 
configure script.



-- 
sly (sylvain letuffe)