Ahlzen/TopOSM — pull request #3 by asciiphil (2012-07-06 18:19:31+00:00)
Title: Metatile caching

This branch contains code that allows for caching of metatiles. I use it to render contour metatiles exactly once, since they're the slowest layer to render and they effectively never change.

This also contains a little reorganization of the layer rendering code. Rather than listing things explicitly as much, everything's driven from the MAPNIK_LAYERS and CAIRO_LAYERS sets in env.py.