PostGIS  3.1.6dev-r@@SVN_REVISION@@

◆ polygonize_garray()

Datum polygonize_garray ( PG_FUNCTION_ARGS  )

Definition at line 2993 of file postgis/lwgeom_geos.c.

2994 {
2995  ArrayType *array;
2996  int is3d = 0;
2997  uint32 nelems, i;
2999  GEOSGeometry *geos_result;
3000  const GEOSGeometry **vgeoms;
3001  int32_t srid = SRID_UNKNOWN;
3002 #if POSTGIS_DEBUG_LEVEL >= 3
3003  static int call=1;
3004 #endif
3005 
3006 #if POSTGIS_DEBUG_LEVEL >= 3
3007  call++;
3008 #endif
3009 
3010  if (PG_ARGISNULL(0))
3011  PG_RETURN_NULL();
3012 
3013  array = PG_GETARG_ARRAYTYPE_P(0);
3014  nelems = array_nelems_not_null(array);
3015 
3016  if (nelems == 0)
3017  PG_RETURN_NULL();
3018 
3019  POSTGIS_DEBUGF(3, "polygonize_garray: number of non-null elements: %d", nelems);
3020 
3021  /* Ok, we really need geos now ;) */
3022  initGEOS(lwpgnotice, lwgeom_geos_error);
3023 
3024  vgeoms = (const GEOSGeometry**) ARRAY2GEOS(array, nelems, &is3d, &srid);
3025 
3026  POSTGIS_DEBUG(3, "polygonize_garray: invoking GEOSpolygonize");
3027 
3028  geos_result = GEOSPolygonize(vgeoms, nelems);
3029 
3030  POSTGIS_DEBUG(3, "polygonize_garray: GEOSpolygonize returned");
3031 
3032  for (i=0; i<nelems; ++i) GEOSGeom_destroy((GEOSGeometry *)vgeoms[i]);
3033  pfree(vgeoms);
3034 
3035  if ( ! geos_result ) PG_RETURN_NULL();
3036 
3037  GEOSSetSRID(geos_result, srid);
3038  result = GEOS2POSTGIS(geos_result, is3d);
3039  GEOSGeom_destroy(geos_result);
3040  if (!result)
3041  {
3042  elog(ERROR, "%s returned an error", __func__);
3043  PG_RETURN_NULL(); /*never get here */
3044  }
3045 
3046  PG_RETURN_POINTER(result);
3047 }
char result[OUT_DOUBLE_BUFFER_SIZE]
Definition: cu_print.c:267
void lwgeom_geos_error(const char *fmt,...)
#define SRID_UNKNOWN
Unknown SRID value.
Definition: liblwgeom.h:229
uint32_t array_nelems_not_null(ArrayType *array)
GSERIALIZED * GEOS2POSTGIS(GEOSGeom geom, char want3d)
GEOSGeometry ** ARRAY2GEOS(ArrayType *array, uint32_t nelems, int *is3d, int *srid)

References ARRAY2GEOS(), array_nelems_not_null(), GEOS2POSTGIS(), lwgeom_geos_error(), result, and SRID_UNKNOWN.

Referenced by pgis_geometry_polygonize_finalfn().

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