transform_geom()

Datum transform_geom

(

PG_FUNCTION_ARGS

)

Definition at line 111 of file postgis/lwgeom_transform.c.

{
        GSERIALIZED *gser, *gser_result=NULL;
        LWGEOM *geom;
        char *input_srs, *output_srs;
        int32 result_srid;
        int rv;
 
        /* Take a copy, since we will be altering the coordinates */
        gser = PG_GETARG_GSERIALIZED_P_COPY(0);
 
        /* Convert from text to cstring for libproj */
        input_srs = text_to_cstring(PG_GETARG_TEXT_P(1));
        output_srs = text_to_cstring(PG_GETARG_TEXT_P(2));
        result_srid = PG_GETARG_INT32(3);
 
        /* now we have a geometry, and input/output PJ structs. */
        geom = lwgeom_from_gserialized(gser);
        rv = lwgeom_transform_from_str(geom, input_srs, output_srs);
        pfree(input_srs);
        pfree(output_srs);
 
        if (rv == LW_FAILURE)
        {
                elog(ERROR, "coordinate transformation failed");
                PG_RETURN_NULL();
        }
 
        /* Re-compute bbox if input had one (COMPUTE_BBOX TAINTING) */
        geom->srid = result_srid;
        if (geom->bbox)
                lwgeom_refresh_bbox(geom);
 
        gser_result = geometry_serialize(geom);
        lwgeom_free(geom);
        PG_FREE_IF_COPY(gser, 0);
 
        PG_RETURN_POINTER(gser_result); /* new geometry */
}

References LWGEOM::bbox, LW_FAILURE, lwgeom_free(), lwgeom_from_gserialized(), lwgeom_refresh_bbox(), lwgeom_transform_from_str(), and LWGEOM::srid.

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