[Tile-serving] [osm2pgsql] Add area reprojection facility (#454)

[Sarah Hoffmann]

> +        return std::accumulate(multi->begin(), multi->end(), 0.0,
> +                               [=](double a, const geos::geom::Geometry *geom) { return a + getArea(geom); });
> +    }
> +
> +    const auto *poly = dynamic_cast<const geos::geom::Polygon *>(geom);
> +    if (!poly) {
> +        return 0.0;
> +    }
> +
> +    // standard polygon - reproject rings individually, then assemble polygon and
> +    // compute area.
> +
> +    const auto *ext = poly->getExteriorRing();
> +    auto *projectedExt = reproject_linearring(ext);
> +    auto nholes = poly->getNumInteriorRing();
> +    std::vector<geos::geom::Geometry *> *projectedHoles = new std::vector<geos::geom::Geometry *>(nholes);

Wrap in std::unique_ptr<> and use release() below in createPolygon() to ensure memory gets clean up when an exception is thrown.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/osm2pgsql/pull/454/files#r42942335
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