PostGIS  2.5.7dev-r@@SVN_REVISION@@

◆ lwgeom_make_valid()

LWGEOM* lwgeom_make_valid ( LWGEOM geom)

Attempts to make an invalid geometries valid w/out losing points.

Definition at line 854 of file liblwgeom/lwgeom_geos_clean.c.

855 {
856  int is3d;
857  GEOSGeom geosgeom;
858  GEOSGeometry* geosout;
859  LWGEOM* lwgeom_out;
860 
861  is3d = FLAGS_GET_Z(lwgeom_in->flags);
862 
863  /*
864  * Step 1 : try to convert to GEOS, if impossible, clean that up first
865  * otherwise (adding only duplicates of existing points)
866  */
867 
869 
870  lwgeom_out = lwgeom_in;
871  geosgeom = LWGEOM2GEOS(lwgeom_out, 1);
872  if (!geosgeom)
873  {
874  LWDEBUGF(4,
875  "Original geom can't be converted to GEOS (%s)"
876  " - will try cleaning that up first",
878 
879  lwgeom_out = lwgeom_make_geos_friendly(lwgeom_out);
880  if (!lwgeom_out) lwerror("Could not make a valid geometry out of input");
881 
882  /* try again as we did cleanup now */
883  /* TODO: invoke LWGEOM2GEOS directly with autoclean ? */
884  geosgeom = LWGEOM2GEOS(lwgeom_out, 0);
885  if (!geosgeom)
886  {
887  lwerror("Couldn't convert POSTGIS geom to GEOS: %s", lwgeom_geos_errmsg);
888  return NULL;
889  }
890  }
891  else
892  {
893  LWDEBUG(4, "original geom converted to GEOS");
894  lwgeom_out = lwgeom_in;
895  }
896 
897 #if POSTGIS_GEOS_VERSION < 38
898  geosout = LWGEOM_GEOS_makeValid(geosgeom);
899 #else
900  geosout = GEOSMakeValid(geosgeom);
901 #endif
902  GEOSGeom_destroy(geosgeom);
903  if (!geosout) return NULL;
904 
905  lwgeom_out = GEOS2LWGEOM(geosout, is3d);
906  GEOSGeom_destroy(geosout);
907 
908  if (lwgeom_is_collection(lwgeom_in) && !lwgeom_is_collection(lwgeom_out))
909  {
910  LWGEOM** ogeoms = lwalloc(sizeof(LWGEOM*));
911  LWGEOM* ogeom;
912  LWDEBUG(3, "lwgeom_make_valid: forcing multi");
913  /* NOTE: this is safe because lwgeom_out is surely not lwgeom_in or
914  * otherwise we couldn't have a collection and a non-collection */
915  assert(lwgeom_in != lwgeom_out);
916  ogeoms[0] = lwgeom_out;
917  ogeom = (LWGEOM*)lwcollection_construct(
918  MULTITYPE[lwgeom_out->type], lwgeom_out->srid, lwgeom_out->bbox, 1, ogeoms);
919  lwgeom_out->bbox = NULL;
920  lwgeom_out = ogeom;
921  }
922 
923  lwgeom_out->srid = lwgeom_in->srid;
924  return lwgeom_out;
925 }
char lwgeom_geos_errmsg[LWGEOM_GEOS_ERRMSG_MAXSIZE]
GEOSGeometry * LWGEOM2GEOS(const LWGEOM *lwgeom, uint8_t autofix)
LWGEOM * GEOS2LWGEOM(const GEOSGeometry *geom, uint8_t want3d)
void lwgeom_geos_error(const char *fmt,...)
GEOSGeometry * LWGEOM_GEOS_makeValid(const GEOSGeometry *)
static LWGEOM * lwgeom_make_geos_friendly(LWGEOM *geom)
#define FLAGS_GET_Z(flags)
Macros for manipulating the 'flags' byte.
Definition: liblwgeom.h:140
int lwgeom_is_collection(const LWGEOM *lwgeom)
Determine whether a LWGEOM can contain sub-geometries or not.
Definition: lwgeom.c:1085
LWCOLLECTION * lwcollection_construct(uint8_t type, int srid, GBOX *bbox, uint32_t ngeoms, LWGEOM **geoms)
Definition: lwcollection.c:43
void * lwalloc(size_t size)
Definition: lwutil.c:229
uint8_t MULTITYPE[NUMTYPES]
Look-up for the correct MULTI* type promotion for singleton types.
Definition: lwgeom.c:345
#define LWDEBUG(level, msg)
Definition: lwgeom_log.h:83
#define LWDEBUGF(level, msg,...)
Definition: lwgeom_log.h:88
void lwerror(const char *fmt,...)
Write a notice out to the error handler.
Definition: lwutil.c:190
uint8_t type
Definition: liblwgeom.h:399
GBOX * bbox
Definition: liblwgeom.h:401
int32_t srid
Definition: liblwgeom.h:402

References LWGEOM::bbox, LWGEOM::flags, FLAGS_GET_Z, GEOS2LWGEOM(), lwalloc(), lwcollection_construct(), LWDEBUG, LWDEBUGF, lwerror(), LWGEOM2GEOS(), lwgeom_geos_errmsg, lwgeom_geos_error(), LWGEOM_GEOS_makeValid(), lwgeom_is_collection(), lwgeom_make_geos_friendly(), MULTITYPE, LWGEOM::srid, and LWGEOM::type.

Referenced by _lwt_AddLineEdge(), lwgeom_clean(), mvt_safe_clip_polygon_by_box(), rt_raster_gdal_polygonize(), rt_raster_surface(), ST_MakeValid(), test_geos_makevalid(), and test_lwgeom_make_valid().

Here is the call graph for this function:
Here is the caller graph for this function: