[Tile-serving] [openstreetmap/osm2pgsql] Add support for data generalization (PR #1942)

[Paul Norman]

@pnorman commented on this pull request.



> +    }
+
+    // XXX other geometry types?
+
+    return 0;
+}
+
+void canvas_t::save(std::string const &filename) const
+{
+    m_rast.save(filename.c_str());
+}
+
+std::string canvas_t::to_wkb(tile_t const &tile, double margin) const
+{
+    std::string wkb;
+    wkb.reserve(61 + 2 + m_rast.size());

Use variables for magic numbers

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