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Choose the megatile features from those that will be in the next N zooms

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This commit is contained in:
Erica Fischer
2024-10-07 12:42:24 -07:00
parent 78661f1cb2
commit 467a7c59e2
7 changed files with 11683 additions and 12272 deletions
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tile.cpp
+8 -5
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@@ -1056,7 +1056,8 @@ static bool skip_next_feature(decompressor *geoms, std::atomic<long long> *geomp
// This function is called repeatedly from write_tile() to retrieve the next feature
// from the input stream. If the stream is at an end, it returns a feature with the
// geometry type set to -2.
static serial_feature next_feature(decompressor *geoms, std::atomic<long long> *geompos_in, int z, unsigned tx, unsigned ty, unsigned *initial_x, unsigned *initial_y, long long *original_features, long long *unclipped_features, int nextzoom, int maxzoom, int minzoom, int max_zoom_increment, size_t pass, std::atomic<long long> *along, long long alongminus, int buffer, std::atomic<bool> *within, compressor **geomfile, std::atomic<long long> *geompos, long long start_geompos[], std::atomic<double> *oprogress, double todo, const char *fname, int child_shards, json_object *filter, const char *global_stringpool, long long *pool_off, std::vector<std::vector<std::string>> *layer_unmaps, bool first_time, bool compressed, multiplier_state *multiplier_state, std::shared_ptr<std::string> &tile_stringpool, std::vector<std::string> const &unidecode_data, unsigned long long &previndex) {
static serial_feature next_feature(decompressor *geoms, std::atomic<long long> *geompos_in, int z, unsigned tx, unsigned ty, unsigned *initial_x, unsigned *initial_y, long long *original_features, long long *unclipped_features, int nextzoom, int maxzoom, int minzoom, int max_zoom_increment, size_t pass, std::atomic<long long> *along, long long alongminus, int buffer, std::atomic<bool> *within, compressor **geomfile, std::atomic<long long> *geompos, long long start_geompos[], std::atomic<double> *oprogress, double todo, const char *fname, int child_shards, json_object *filter, const char *global_stringpool, long long *pool_off, std::vector<std::vector<std::string>> *layer_unmaps, bool first_time, bool compressed, multiplier_state *multiplier_state, std::shared_ptr<std::string> &tile_stringpool, std::vector<std::string> const &unidecode_data, unsigned long long &previndex, double droprate) {
double extra_multiplier_zooms = log(retain_points_multiplier) / log(droprate);
while (1) {
serial_feature sf;
long long len;
@@ -1221,7 +1222,7 @@ static serial_feature next_feature(decompressor *geoms, std::atomic<long long> *
if (z >= sf.feature_minzoom || sf.dropped == FEATURE_KEPT) {
count->second = 0;
sf.dropped = FEATURE_KEPT; // feature is kept
} else if (count->second + 1 < retain_points_multiplier) {
} else if (ceil(z + extra_multiplier_zooms) >= sf.feature_minzoom && count->second + 1 < retain_points_multiplier) {
count->second++;
sf.dropped = count->second;
} else {
@@ -1287,6 +1288,7 @@ struct run_prefilter_args {
std::vector<std::string> const *unidecode_data;
bool first_time = false;
bool compressed = false;
double droprate = 1;
};
void *run_prefilter(void *v) {
@@ -1297,7 +1299,7 @@ void *run_prefilter(void *v) {
unsigned long long previndex = 0;
while (1) {
serial_feature sf = next_feature(rpa->geoms, rpa->geompos_in, rpa->z, rpa->tx, rpa->ty, rpa->initial_x, rpa->initial_y, rpa->original_features, rpa->unclipped_features, rpa->nextzoom, rpa->maxzoom, rpa->minzoom, rpa->max_zoom_increment, rpa->pass, rpa->along, rpa->alongminus, rpa->buffer, rpa->within, rpa->geomfile, rpa->geompos, rpa->start_geompos, rpa->oprogress, rpa->todo, rpa->fname, rpa->child_shards, rpa->filter, rpa->global_stringpool, rpa->pool_off, rpa->layer_unmaps, rpa->first_time, rpa->compressed, &multiplier_state, tile_stringpool, *(rpa->unidecode_data), previndex);
serial_feature sf = next_feature(rpa->geoms, rpa->geompos_in, rpa->z, rpa->tx, rpa->ty, rpa->initial_x, rpa->initial_y, rpa->original_features, rpa->unclipped_features, rpa->nextzoom, rpa->maxzoom, rpa->minzoom, rpa->max_zoom_increment, rpa->pass, rpa->along, rpa->alongminus, rpa->buffer, rpa->within, rpa->geomfile, rpa->geompos, rpa->start_geompos, rpa->oprogress, rpa->todo, rpa->fname, rpa->child_shards, rpa->filter, rpa->global_stringpool, rpa->pool_off, rpa->layer_unmaps, rpa->first_time, rpa->compressed, &multiplier_state, tile_stringpool, *(rpa->unidecode_data), previndex, rpa->droprate);
if (sf.t < 0) {
break;
}
@@ -1804,6 +1806,7 @@ long long write_tile(decompressor *geoms, std::atomic<long long> *geompos_in, ch
rpa.unidecode_data = &unidecode_data;
rpa.first_time = first_time;
rpa.compressed = compressed_input;
rpa.droprate = arg->droprate;
// this does need to be a real thread, so we can pipe both to and from it
if (pthread_create(&prefilter_writer, NULL, run_prefilter, &rpa) != 0) {
@@ -1835,7 +1838,7 @@ long long write_tile(decompressor *geoms, std::atomic<long long> *geompos_in, ch
ssize_t which_serial_feature = -1;
if (prefilter == NULL) {
sf = next_feature(geoms, geompos_in, z, tx, ty, initial_x, initial_y, &original_features, &unclipped_features, nextzoom, maxzoom, minzoom, max_zoom_increment, pass, along, alongminus, buffer, within, geomfile, geompos, start_geompos, &oprogress, todo, fname, child_shards, filter, global_stringpool, pool_off, layer_unmaps, first_time, compressed_input, &multiplier_state, tile_stringpool, unidecode_data, next_feature_previndex);
sf = next_feature(geoms, geompos_in, z, tx, ty, initial_x, initial_y, &original_features, &unclipped_features, nextzoom, maxzoom, minzoom, max_zoom_increment, pass, along, alongminus, buffer, within, geomfile, geompos, start_geompos, &oprogress, todo, fname, child_shards, filter, global_stringpool, pool_off, layer_unmaps, first_time, compressed_input, &multiplier_state, tile_stringpool, unidecode_data, next_feature_previndex, arg->droprate);
} else {
sf = parse_feature(prefilter_jp, z, tx, ty, layermaps, tiling_seg, layer_unmaps, postfilter != NULL);
}
@@ -1894,7 +1897,7 @@ long long write_tile(decompressor *geoms, std::atomic<long long> *geompos_in, ch
}
if (sf.dropped == FEATURE_DROPPED || drop_rest) {
multiplier_seq = (multiplier_seq + 1) % retain_points_multiplier;
multiplier_seq = 0;
if (find_feature_to_accumulate_onto(features, sf, which_serial_feature, layer_unmaps, LLONG_MAX, multiplier_seq)) {
preserve_attributes(arg->attribute_accum, sf, features[which_serial_feature]);