gserialized_datum_get_box2df_p()

int gserialized_datum_get_box2df_p	(	Datum	gsdatum,
		BOX2DF *	box2df
	)

Peak into a GSERIALIZED datum to find the bounding box.

If the box is there, copy it out and return it. If not, calculate the box from the full object and return the box based on that. If no box is available, return LW_FAILURE, otherwise LW_SUCCESS.

Definition at line 643 of file gserialized_gist_2d.c.

{
        GSERIALIZED *gpart;
        uint8_t flags;
        int result = LW_SUCCESS;
 
        POSTGIS_DEBUG(4, "entered function");
 
        /*
        ** The most info we need is the 8 bytes of serialized header plus the
        ** of floats necessary to hold the bounding box.
        */
        if (VARATT_IS_EXTENDED(gsdatum))
        {
                gpart = (GSERIALIZED*)PG_DETOAST_DATUM_SLICE(gsdatum, 0, 8 + sizeof(BOX2DF));
        }
        else
        {
                gpart = (GSERIALIZED*)PG_DETOAST_DATUM(gsdatum);
        }
 
        flags = gpart->flags;
 
        POSTGIS_DEBUGF(4, "got flags %d", gpart->flags);
 
        /* Do we even have a serialized bounding box? */
        if ( FLAGS_GET_BBOX(flags) )
        {
                /* Yes! Copy it out into the box! */
                POSTGIS_DEBUG(4, "copying box out of serialization");
                memcpy(box2df, gpart->data, sizeof(BOX2DF));
                result = LW_SUCCESS;
        }
        else
        {
                /* No, we need to calculate it from the full object. */
                GBOX gbox;
                GSERIALIZED *g = (GSERIALIZED*)PG_DETOAST_DATUM(gsdatum);
 
                gbox_init(&gbox);
 
                if (gserialized_get_gbox_p(g, &gbox) == LW_FAILURE)
                {
                        POSTGIS_DEBUG(4, "could not calculate bbox, returning failure");
                        POSTGIS_FREE_IF_COPY_P(gpart, gsdatum);
                        POSTGIS_FREE_IF_COPY_P(g, gsdatum);
                        return LW_FAILURE;
                }
                POSTGIS_FREE_IF_COPY_P(g, gsdatum);
                result = box2df_from_gbox_p(&gbox, box2df);
        }
 
        POSTGIS_FREE_IF_COPY_P(gpart, gsdatum);
 
        if ( result == LW_SUCCESS )
        {
                POSTGIS_DEBUGF(4, "got box2df %s", box2df_to_string(box2df));
        }
 
        return result;
}

References box2df_from_gbox_p(), box2df_to_string(), GSERIALIZED::data, GSERIALIZED::flags, FLAGS_GET_BBOX, gbox_init(), gserialized_get_gbox_p(), LW_FAILURE, and LW_SUCCESS.

Referenced by geom2d_brin_inclusion_add_value(), gserialized_datum_predicate_2d(), gserialized_datum_predicate_box2df_geom_2d(), gserialized_distance_box_2d(), gserialized_distance_centroid_2d(), gserialized_gist_compress_2d(), gserialized_gist_consistent_2d(), gserialized_gist_distance_2d(), gserialized_spgist_compress_2d(), gserialized_spgist_inner_consistent_2d(), and gserialized_spgist_leaf_consistent_2d().

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