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Add a flag to retain multiplier features by minimum distance

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This commit is contained in:
Erica Fischer
2024-10-08 16:34:08 -07:00
parent 71cf446aec
commit 01f14a4255
4 changed files with 15 additions and 1 deletions
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tile.cpp
+9 -1
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@@ -1237,6 +1237,9 @@ static serial_feature next_feature(decompressor *geoms, std::atomic<long long> *
} else if (z + extra_multiplier_zooms >= feature_minzoom && count->second + 1 < retain_points_multiplier) {
count->second++;
sf.dropped = count->second;
} else if (preserve_multiplier_density_threshold > 0 &&
sf.gap > ((1LL << (32 - z)) / preserve_multiplier_density_threshold) * ((1LL << (32 - z)) / preserve_multiplier_density_threshold)) {
sf.dropped = FEATURE_NO_REALLY_KEEP_IT_AROUND;
} else {
sf.dropped = FEATURE_DROPPED;
}
@@ -1898,8 +1901,11 @@ long long write_tile(decompressor *geoms, std::atomic<long long> *geompos_in, ch
} else {
can_stop_early = false;
if (sf.dropped != FEATURE_DROPPED) {
if (sf.dropped != FEATURE_DROPPED && sf.dropped != FEATURE_NO_REALLY_KEEP_IT_AROUND) {
// Does the current multiplier cluster already have too many features?
// (Because we are dropping dynamically, and we have already filled the
// cluster with features that were dynamically dropped from being
// primary features)
// If so, we have to drop this one, even if it would potentially qualify
// as a secondary feature to be exposed by filtering
if (layer.multiplier_cluster_size >= (size_t) retain_points_multiplier) {
@@ -2146,6 +2152,8 @@ long long write_tile(decompressor *geoms, std::atomic<long long> *geompos_in, ch
if (sf.dropped == FEATURE_KEPT) {
layer.multiplier_cluster_size = 1;
lead_features_count++;
} else if (sf.dropped == FEATURE_NO_REALLY_KEEP_IT_AROUND) {
other_multiplier_cluster_features_count++;
} else {
layer.multiplier_cluster_size++;
other_multiplier_cluster_features_count++;