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Checkerboard which tiles labels are generated in, to reduce adjacency

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This commit is contained in:
Erica Fischer
2022-10-07 11:00:09 -07:00
parent c34348218f
commit 2f0c9bf9c8
3 changed files with 811 additions and 2 deletions
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tile.cpp
+20 -1
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@@ -1800,7 +1800,7 @@ static bool line_is_too_small(drawvec const &geometry, int z, int detail) {
return true;
}
long long write_tile(FILE *geoms, std::atomic<long long> *geompos_in, char *metabase, char *stringpool, int z, unsigned tx, unsigned ty, const int detail, int min_detail, sqlite3 *outdb, const char *outdir, int buffer, const char *fname, FILE **geomfile, int minzoom, int maxzoom, double todo, std::atomic<long long> *along, long long alongminus, double gamma, int child_shards, long long *meta_off, long long *pool_off, unsigned *initial_x, unsigned *initial_y, std::atomic<int> *running, double simplification, std::vector<std::map<std::string, layermap_entry>> *layermaps, std::vector<std::vector<std::string>> *layer_unmaps, size_t tiling_seg, size_t pass, size_t passes, unsigned long long mingap, long long minextent, double fraction, const char *prefilter, const char *postfilter, struct json_object *filter, write_tile_args *arg, atomic_strategy *strategy) {
long long write_tile(FILE *geoms, std::atomic<long long> *geompos_in, char *metabase, char *stringpool, int z, const unsigned tx, const unsigned ty, const int detail, int min_detail, sqlite3 *outdb, const char *outdir, int buffer, const char *fname, FILE **geomfile, int minzoom, int maxzoom, double todo, std::atomic<long long> *along, long long alongminus, double gamma, int child_shards, long long *meta_off, long long *pool_off, unsigned *initial_x, unsigned *initial_y, std::atomic<int> *running, double simplification, std::vector<std::map<std::string, layermap_entry>> *layermaps, std::vector<std::vector<std::string>> *layer_unmaps, size_t tiling_seg, size_t pass, size_t passes, unsigned long long mingap, long long minextent, double fraction, const char *prefilter, const char *postfilter, struct json_object *filter, write_tile_args *arg, atomic_strategy *strategy) {
double merge_fraction = 1;
double mingap_fraction = 1;
double minextent_fraction = 1;
@@ -2085,6 +2085,25 @@ long long write_tile(FILE *geoms, std::atomic<long long> *geompos_in, char *meta
}
if (sf.t == VT_POLYGON && additional[A_GENERATE_POLYGON_LABEL_POINTS]) {
// Checkerboard which tiles labels are generated for this polygon in,
// so we don't end up with multiple labels right next to each other.
// There is a label in the tile that the polygon nominally belongs to,
// and in other tiles reachable diagonally from there, but not in
// the ones directly on either side.
unsigned wx, wy;
decode_index(sf.index, &wx, &wy);
unsigned poly_tx = 0, poly_ty = 0;
if (z != 0) {
poly_tx = wx >> (32 - z);
poly_ty = wy >> (32 - z);
if (((tx - poly_tx + ty - poly_ty) & 1) != 0) {
continue;
}
}
sf.t = VT_POINT;
sf.geometry = polygon_to_anchor(sf.geometry);
}