Class TileFilter

source code

object --+
         |
        TileFilter

Known Subclasses:

• PNGQuantTileFilter
• , WaterMarkTileFilter

Tile filters can manipulate tiles before they are written to the cache.

A TileFilter needs a create_filter method that takes layer_conf and a priority attribute.

The priority controls in wich order the filters are applied. A higher value means that the filter is applied first.

The create_filter method should return the filter function or None if the filter does not apply to the layer. Each filter should use some layer variable(s) to configure if the filter should apply to a specific layer. The create_filter should check for this variable(s) in the given layer_conf.

The filter function gets a mapproxy.core.cache._Tile and must return the same (modified) tile.