PostGIS  3.1.6dev-r@@SVN_REVISION@@

◆ lwgeom_symdifference_prec()

LWGEOM* lwgeom_symdifference_prec ( const LWGEOM geom1,
const LWGEOM geom2,
double  gridSize 
)

Definition at line 865 of file liblwgeom/lwgeom_geos.c.

866 {
867  LWGEOM* result;
868  int32_t srid = RESULT_SRID(geom1, geom2);
869  uint8_t is3d = (FLAGS_GET_Z(geom1->flags) || FLAGS_GET_Z(geom2->flags));
870  GEOSGeometry *g1, *g2, *g3;
871 
872  if (srid == SRID_INVALID) return NULL;
873 
874  /* A.SymDifference(Empty) == A */
875  if (lwgeom_is_empty(geom2)) return lwgeom_clone_deep(geom1);
876 
877  /* Empty.DymDifference(B) == B */
878  if (lwgeom_is_empty(geom1)) return lwgeom_clone_deep(geom2);
879 
880  initGEOS(lwnotice, lwgeom_geos_error);
881 
882  if (!(g1 = LWGEOM2GEOS(geom1, AUTOFIX))) GEOS_FAIL();
883  if (!(g2 = LWGEOM2GEOS(geom2, AUTOFIX))) GEOS_FREE_AND_FAIL(g1);
884 
885  if ( prec >= 0) {
886 #if POSTGIS_GEOS_VERSION < 39
887  lwerror("Fixed-precision difference requires GEOS-3.9 or higher");
888  GEOS_FREE_AND_FAIL(g1, g2);
889  return NULL;
890 #else
891  g3 = GEOSSymDifferencePrec(g1, g2, prec);
892 #endif
893  }
894  else
895  {
896  g3 = GEOSSymDifference(g1, g2);
897  }
898 
899  if (!g3) GEOS_FREE_AND_FAIL(g1, g2);
900  GEOSSetSRID(g3, srid);
901 
902  if (!(result = GEOS2LWGEOM(g3, is3d)))
903  GEOS_FREE_AND_FAIL(g1, g2, g3);
904 
905  GEOS_FREE(g1, g2, g3);
906  return result;
907 }
char result[OUT_DOUBLE_BUFFER_SIZE]
Definition: cu_print.c:267
#define GEOS_FREE(...)
#define AUTOFIX
#define RESULT_SRID(...)
#define GEOS_FAIL()
#define GEOS_FREE_AND_FAIL(...)
GEOSGeometry * LWGEOM2GEOS(const LWGEOM *lwgeom, uint8_t autofix)
LWGEOM * GEOS2LWGEOM(const GEOSGeometry *geom, uint8_t want3d)
void lwgeom_geos_error(const char *fmt,...)
#define SRID_INVALID
Definition: liblwgeom.h:233
LWGEOM * lwgeom_clone_deep(const LWGEOM *lwgeom)
Deep clone an LWGEOM, everything is copied.
Definition: lwgeom.c:512
#define FLAGS_GET_Z(flags)
Definition: liblwgeom.h:179
void lwerror(const char *fmt,...)
Write a notice out to the error handler.
Definition: lwutil.c:190
void lwnotice(const char *fmt,...)
Write a notice out to the notice handler.
Definition: lwutil.c:177
static int lwgeom_is_empty(const LWGEOM *geom)
Return true or false depending on whether a geometry is an "empty" geometry (no vertices members)
Definition: lwinline.h:203
lwflags_t flags
Definition: liblwgeom.h:475

References AUTOFIX, LWGEOM::flags, FLAGS_GET_Z, GEOS2LWGEOM(), GEOS_FAIL, GEOS_FREE, GEOS_FREE_AND_FAIL, lwerror(), LWGEOM2GEOS(), lwgeom_clone_deep(), lwgeom_geos_error(), lwgeom_is_empty(), lwnotice(), result, RESULT_SRID, and SRID_INVALID.

Referenced by lwgeom_symdifference(), and ST_SymDifference().

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