vtile-comp.js

// current

function composite(buffers, headers) {
    var vtile = new mapnik.VectorTile(+z, +x, +y);

    try {
        vtile.composite(buffers, {buffer_size: 256, tolerance: 1});
    } catch (err) {
        return callback(err);
    }

    headers.unshift(s.headers);
    headers = TLU.headers(headers, 'vector.pbf');

    // The absence of params indicates the tile is not needed for serving
    // over HTTP but is instead to be used internally for a render.
    if (!params) return vtile.parse(function(err) {
        return err ? callback(err) : callback(null, vtile, headers);
    });

    zlib.gzip(vtile.getData(), function(err, buffer) {
        if (err) return callback(err);
        return callback(err, buffer, headers);
    });
}
    
// future
function composite(buffers, headers) {
    headers.unshift(s.headers);
    headers = TLU.headers(headers, 'vector.pbf');
    var opts = {buffer_size: 256, tolerance: 1};
    mapnik.composite(+z, +x, +y, buffers, opts, function(err,vtile) {
        if (err) return callback(err);
        vtile.getData('gzip',function(err,buffer) {
            if (err) return callback(err);
            return callback(err, buffer, headers);
        })
    });
}