PostGIS  2.5.7dev-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 1187 of file mvt.c.

1188 {
1189  bool isnull = false;
1190  Datum datum;
1191  GSERIALIZED *gs;
1192  LWGEOM *lwgeom;
1193  VectorTile__Tile__Feature *feature;
1194  VectorTile__Tile__Layer *layer = ctx->layer;
1195 /* VectorTile__Tile__Feature **features = layer->features; */
1196  POSTGIS_DEBUG(2, "mvt_agg_transfn called");
1197 
1198  if (layer->n_features >= ctx->features_capacity)
1199  {
1200  size_t new_capacity = ctx->features_capacity * 2;
1201  layer->features = repalloc(layer->features, new_capacity *
1202  sizeof(*layer->features));
1203  ctx->features_capacity = new_capacity;
1204  POSTGIS_DEBUGF(3, "mvt_agg_transfn new_capacity: %zd", new_capacity);
1205  }
1206 
1207  if (ctx->geom_index == UINT32_MAX)
1208  parse_column_keys(ctx);
1209 
1210  datum = GetAttributeByNum(ctx->row, ctx->geom_index + 1, &isnull);
1211  POSTGIS_DEBUGF(3, "mvt_agg_transfn ctx->geom_index: %d", ctx->geom_index);
1212  POSTGIS_DEBUGF(3, "mvt_agg_transfn isnull: %u", isnull);
1213  POSTGIS_DEBUGF(3, "mvt_agg_transfn datum: %lu", datum);
1214  if (isnull) /* Skip rows that have null geometry */
1215  {
1216  POSTGIS_DEBUG(3, "mvt_agg_transfn got null geom");
1217  return;
1218  }
1219 
1220  feature = palloc(sizeof(*feature));
1221  vector_tile__tile__feature__init(feature);
1222 
1223  ctx->feature = feature;
1224 
1225  gs = (GSERIALIZED *) PG_DETOAST_DATUM(datum);
1226  lwgeom = lwgeom_from_gserialized(gs);
1227 
1228  POSTGIS_DEBUGF(3, "mvt_agg_transfn encoded feature count: %zd", layer->n_features);
1229  layer->features[layer->n_features++] = feature;
1230 
1231  encode_geometry(ctx, lwgeom);
1232  lwgeom_free(lwgeom);
1233  // TODO: free detoasted datum?
1234  parse_values(ctx);
1235 }
LWGEOM * lwgeom_from_gserialized(const GSERIALIZED *g)
Allocate a new LWGEOM from a GSERIALIZED.
void lwgeom_free(LWGEOM *geom)
Definition: lwgeom.c:1144
#define UINT32_MAX
Definition: lwin_wkt_lex.c:343
static void encode_geometry(mvt_agg_context *ctx, LWGEOM *lwgeom)
Definition: mvt.c:268
static void parse_column_keys(mvt_agg_context *ctx)
Definition: mvt.c:319
static void parse_values(mvt_agg_context *ctx)
Definition: mvt.c:630
uint32_t geom_index
Definition: mvt.h:63
size_t features_capacity
Definition: mvt.h:68
VectorTile__Tile__Layer * layer
Definition: mvt.h:66
VectorTile__Tile__Feature * feature
Definition: mvt.h:65
HeapTupleHeader row
Definition: mvt.h:64

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().

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