[Tile-serving] [openstreetmap/osm2pgsql] Cleanup reprojection (#1263)

[Jochen Topf]

@joto commented on this pull request.



> @@ -122,6 +122,21 @@ int expire_tiles::normalise_tile_x_coord(int x)
     return x;
 }
 
+/**
+ * Converts from target coordinates to tile coordinates.
+ *
+ * The zoom level for the coordinates is explicitly given in the
+ * parameter map_width.
+ */
+static void coords_to_tile(reprojection const &projection, double *tilex,
+                           double *tiley, double lon, double lat, int map_width)

I added a commit with this.

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