gserialized1_set_gbox()

GSERIALIZED * gserialized1_set_gbox	(	GSERIALIZED *	g,
		GBOX *	gbox
	)

Update the bounding box of a GSERIALIZED, allocating a fresh one if there is not enough space to just write the new box in.

Copy a new bounding box into an existing gserialized.

WARNING if a new object needs to be created, the input pointer will have to be freed by the caller! Check to see if input == output. Returns null if there's a problem like mismatched dimensions.

Definition at line 1509 of file gserialized1.c.

{
 
        int g_ndims = G1FLAGS_NDIMS_BOX(g->gflags);
        int box_ndims = FLAGS_NDIMS_BOX(gbox->flags);
        GSERIALIZED *g_out = NULL;
        size_t box_size = 2 * g_ndims * sizeof(float);
        float *fbox;
        int fbox_pos = 0;
 
        /* The dimensionality of the inputs has to match or we are SOL. */
        if ( g_ndims != box_ndims )
        {
                return NULL;
        }
 
        /* Serialized already has room for a box. */
        if (G1FLAGS_GET_BBOX(g->gflags))
        {
                g_out = g;
        }
        /* Serialized has no box. We need to allocate enough space for the old
           data plus the box, and leave a gap in the memory segment to write
           the new values into.
        */
        else
        {
                size_t varsize_new = LWSIZE_GET(g->size) + box_size;
                uint8_t *ptr;
                g_out = lwalloc(varsize_new);
                /* Copy the head of g into place */
                memcpy(g_out, g, 8);
                /* Copy the body of g into place after leaving space for the box */
                ptr = g_out->data;
                ptr += box_size;
                memcpy(ptr, g->data, LWSIZE_GET(g->size) - 8);
                G1FLAGS_SET_BBOX(g_out->gflags, 1);
                LWSIZE_SET(g_out->size, varsize_new);
        }
 
        /* Move bounds to nearest float values */
        gbox_float_round(gbox);
        /* Now write the float box values into the memory segment */
        fbox = (float*)(g_out->data);
        /* Copy in X/Y */
        fbox[fbox_pos++] = gbox->xmin;
        fbox[fbox_pos++] = gbox->xmax;
        fbox[fbox_pos++] = gbox->ymin;
        fbox[fbox_pos++] = gbox->ymax;
        /* Optionally copy in higher dims */
        if(gserialized1_has_z(g) || gserialized1_is_geodetic(g))
        {
                fbox[fbox_pos++] = gbox->zmin;
                fbox[fbox_pos++] = gbox->zmax;
        }
        if(gserialized1_has_m(g) && ! gserialized1_is_geodetic(g))
        {
                fbox[fbox_pos++] = gbox->mmin;
                fbox[fbox_pos++] = gbox->mmax;
        }
 
        return g_out;
}

References GSERIALIZED::data, GBOX::flags, FLAGS_NDIMS_BOX, G1FLAGS_GET_BBOX, G1FLAGS_NDIMS_BOX, G1FLAGS_SET_BBOX, gbox_float_round(), GSERIALIZED::gflags, gserialized1_has_m(), gserialized1_has_z(), gserialized1_is_geodetic(), lwalloc(), LWSIZE_GET, LWSIZE_SET, GBOX::mmax, GBOX::mmin, GSERIALIZED::size, GBOX::xmax, GBOX::xmin, GBOX::ymax, GBOX::ymin, GBOX::zmax, and GBOX::zmin.

Referenced by gserialized_set_gbox().

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