mapnik/mapnik — pull request #910 by zerebubuth (2011-10-12 00:14:02+00:00)
Title: Added a 'multi' tiled raster plugin reader for virtual images

adds another policy to the raster plugin which can pull raster data from a constant-stride tile grid on disk. this may be of use to anyone with very large background images to composite in. the motivation was that it be more compact and faster than including all the rasters, each with its own entry, when they're in a rectangular grid anyway.