PostGIS  2.5.2dev-r@@SVN_REVISION@@

◆ mvt_agg_transfn()

void mvt_agg_transfn ( mvt_agg_context ctx)

Aggregation step.

Expands features array if needed by a factor of 2. Allocates a new feature, increment feature counter and encode geometry and properties into it.  

Definition at line 987 of file mvt.c.

References encode_geometry(), mvt_agg_context::feature, mvt_agg_context::features_capacity, mvt_agg_context::geom_index, mvt_agg_context::layer, lwgeom_free(), lwgeom_from_gserialized(), parse_column_keys(), parse_values(), mvt_agg_context::row, and UINT32_MAX.

Referenced by pgis_asmvt_transfn().

988 {
989  bool isnull = false;
990  Datum datum;
991  GSERIALIZED *gs;
992  LWGEOM *lwgeom;
993  VectorTile__Tile__Feature *feature;
994  VectorTile__Tile__Layer *layer = ctx->layer;
995 /* VectorTile__Tile__Feature **features = layer->features; */
996  POSTGIS_DEBUG(2, "mvt_agg_transfn called");
997 
998  if (layer->n_features >= ctx->features_capacity)
999  {
1000  size_t new_capacity = ctx->features_capacity * 2;
1001  layer->features = repalloc(layer->features, new_capacity *
1002  sizeof(*layer->features));
1003  ctx->features_capacity = new_capacity;
1004  POSTGIS_DEBUGF(3, "mvt_agg_transfn new_capacity: %zd", new_capacity);
1005  }
1006 
1007  if (ctx->geom_index == UINT32_MAX)
1008  parse_column_keys(ctx);
1009 
1010  datum = GetAttributeByNum(ctx->row, ctx->geom_index + 1, &isnull);
1011  POSTGIS_DEBUGF(3, "mvt_agg_transfn ctx->geom_index: %d", ctx->geom_index);
1012  POSTGIS_DEBUGF(3, "mvt_agg_transfn isnull: %u", isnull);
1013  POSTGIS_DEBUGF(3, "mvt_agg_transfn datum: %lu", datum);
1014  if (isnull) /* Skip rows that have null geometry */
1015  {
1016  POSTGIS_DEBUG(3, "mvt_agg_transfn got null geom");
1017  return;
1018  }
1019 
1020  feature = palloc(sizeof(*feature));
1021  vector_tile__tile__feature__init(feature);
1022 
1023  ctx->feature = feature;
1024 
1025  gs = (GSERIALIZED *) PG_DETOAST_DATUM(datum);
1026  lwgeom = lwgeom_from_gserialized(gs);
1027 
1028  POSTGIS_DEBUGF(3, "mvt_agg_transfn encoded feature count: %zd", layer->n_features);
1029  layer->features[layer->n_features++] = feature;
1030 
1031  encode_geometry(ctx, lwgeom);
1032  lwgeom_free(lwgeom);
1033  // TODO: free detoasted datum?
1034  parse_values(ctx);
1035 }
HeapTupleHeader row
Definition: mvt.h:64
LWGEOM * lwgeom_from_gserialized(const GSERIALIZED *g)
Allocate a new LWGEOM from a GSERIALIZED.
void lwgeom_free(LWGEOM *geom)
Definition: lwgeom.c:1144
static void parse_values(mvt_agg_context *ctx)
Definition: mvt.c:629
VectorTile__Tile__Layer * layer
Definition: mvt.h:66
size_t features_capacity
Definition: mvt.h:68
#define UINT32_MAX
Definition: lwin_wkt_lex.c:343
uint32_t geom_index
Definition: mvt.h:63
VectorTile__Tile__Feature * feature
Definition: mvt.h:65
static void parse_column_keys(mvt_agg_context *ctx)
Definition: mvt.c:318
static void encode_geometry(mvt_agg_context *ctx, LWGEOM *lwgeom)
Definition: mvt.c:267
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