mvt_agg_finalfn()

uint8_t* mvt_agg_finalfn

(

struct mvt_agg_context *

ctx

)

Finalize aggregation.

Encode keys and values and put the aggregated Layer message into a Tile message and returns it packed as a bytea.

Definition at line 942 of file mvt.c.

References encode_keys(), encode_values(), and mvt_agg_context::layer.

Referenced by pgis_asmvt_finalfn().

{
        VectorTile__Tile__Layer *layers[1];
        VectorTile__Tile tile = VECTOR_TILE__TILE__INIT;
        size_t len;
        uint8_t *buf;

        POSTGIS_DEBUG(2, "mvt_agg_finalfn called");
        POSTGIS_DEBUGF(2, "mvt_agg_finalfn n_features == %zd", ctx->layer->n_features);

        /* Zero features => empty bytea output */
        if (ctx->layer->n_features == 0)
        {
                buf = palloc(VARHDRSZ);
                SET_VARSIZE(buf, VARHDRSZ);
                return buf;
        }

        encode_keys(ctx);
        encode_values(ctx);

        layers[0] = ctx->layer;

        tile.n_layers = 1;
        tile.layers = layers;

        len = vector_tile__tile__get_packed_size(&tile);
        buf = palloc(sizeof(*buf) * (len + VARHDRSZ));
        vector_tile__tile__pack(&tile, buf + VARHDRSZ);

        SET_VARSIZE(buf, VARHDRSZ + len);

        return buf;
}

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