[Tile-serving] [mod_tile] Bleed (#29)

[apmon]

<quote>I could open up a mapnik ticket, but the more I think about this the more I wonder if @plepe's solution is the right one and the tile-handling daemon should just ask mapnik for a larger image.</quote>
It does ask mapnik for a larger area. Thats why it sets the buffer_size.

According to the documentation: "buffer-size: Default 0; Good value is usually tile size/2 to help avoid cut labels. This influences envelope used by placement detector". So that parameter is designed to counter act exactly the issue you are describing. If it doesn't do this (for what ever reason) then it seems like a bug in mapnik to me. Furthermore, from reports, it sounds like it is a regression from earlier versions of mapnik.

Given that a slippy map is basically an infinite map that doesn't have any visual edges, avoid-edges should probably be disabled (assuming the rendering buffer works correctly). After all which edges should it actually avoid and why? The osm style sheet doesn't appear to specify avoid-edges anywhere in the style. Is the default disabled or enabled? 



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