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Upgrade some dynamically dropped features to multiplier features

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This commit is contained in:
Erica Fischer
2024-02-12 14:28:49 -08:00
parent 10257e10cb
commit 6a6cd552bd
2 changed files with 18327 additions and 5984 deletions
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tile.cpp
+50 -27
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@@ -1466,20 +1466,6 @@ long long write_tile(decompressor *geoms, std::atomic<long long> *geompos_in, ch
double minextent_fraction = 1;
double mindrop_sequence_fraction = 1;
// allow larger tile sizes at low zooms when the retain-points-multiplier
// is intended to allow more points through. scale back down toward a
// tile size multiple of 1 at basezoom and beyond
size_t scaled_max_tile_size = max_tile_size;
double regular_retention = 1 / exp(log(arg->droprate) * (arg->basezoom - z));
if (regular_retention > 1) {
regular_retention = 1;
}
double multiplier_retention = 1 / exp(log(arg->droprate) * (arg->basezoom - z)) * retain_points_multiplier;
if (multiplier_retention > 1) {
multiplier_retention = 1;
}
scaled_max_tile_size *= multiplier_retention / regular_retention;
static std::atomic<double> oprogress(0);
long long og = *geompos_in;
@@ -1538,6 +1524,10 @@ long long write_tile(decompressor *geoms, std::atomic<long long> *geompos_in, ch
size_t unsimplified_geometry_size = 0;
size_t simplified_geometry_through = 0;
size_t multiplier_cluster_size = 0; // of current cluster. should this be per-layer?
size_t lead_features_count = 0; // of the tile so far
size_t other_multiplier_cluster_features_count = 0; // of the tile so far
int within[child_shards];
std::atomic<long long> geompos[child_shards];
for (size_t i = 0; i < (size_t) child_shards; i++) {
@@ -1747,10 +1737,16 @@ long long write_tile(decompressor *geoms, std::atomic<long long> *geompos_in, ch
indices.push_back(sf.index);
}
if (sf.index - merge_previndex < mingap && 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]);
strategy->dropped_as_needed++;
drop_rest = true;
continue;
if (multiplier_cluster_size < (size_t) retain_points_multiplier) {
// we have capacity to keep this feature as part of an existing multiplier cluster that isn't full yet
// so do that instead of dropping it
sf.dropped = multiplier_cluster_size + 1;
} else {
preserve_attributes(arg->attribute_accum, sf, features[which_serial_feature]);
strategy->dropped_as_needed++;
drop_rest = true;
continue;
}
}
} else if (additional[A_COALESCE_DENSEST_AS_NEEDED]) {
if (indices.size() < MAX_INDICES) {
@@ -1770,10 +1766,16 @@ long long write_tile(decompressor *geoms, std::atomic<long long> *geompos_in, ch
// search here is for LLONG_MAX, not minextent, because we are dropping features, not coalescing them,
// so we shouldn't expect to find anything small that we can related this feature to.
if (minextent != 0 && sf.extent + coalesced_area <= minextent && 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]);
strategy->dropped_as_needed++;
drop_rest = true;
continue;
if (multiplier_cluster_size < (size_t) retain_points_multiplier) {
// we have capacity to keep this feature as part of an existing multiplier cluster that isn't full yet
// so do that instead of dropping it
sf.dropped = multiplier_cluster_size + 1;
} else {
preserve_attributes(arg->attribute_accum, sf, features[which_serial_feature]);
strategy->dropped_as_needed++;
drop_rest = true;
continue;
}
}
} else if (additional[A_COALESCE_SMALLEST_AS_NEEDED]) {
add_sample_to(extents, sf.extent, extents_increment, seq);
@@ -1791,10 +1793,16 @@ long long write_tile(decompressor *geoms, std::atomic<long long> *geompos_in, ch
// search here is for LLONG_MAX, not minextent, because we are dropping features, not coalescing them,
// so we shouldn't expect to find anything small that we can related this feature to.
if (mindrop_sequence != 0 && drop_sequence <= mindrop_sequence && 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]);
strategy->dropped_as_needed++;
drop_rest = true;
continue;
if (multiplier_cluster_size < (size_t) retain_points_multiplier) {
// we have capacity to keep this feature as part of an existing multiplier cluster that isn't full yet
// so do that instead of dropping it
sf.dropped = multiplier_cluster_size + 1;
} else {
preserve_attributes(arg->attribute_accum, sf, features[which_serial_feature]);
strategy->dropped_as_needed++;
drop_rest = true;
continue;
}
}
} else if (additional[A_COALESCE_FRACTION_AS_NEEDED]) {
add_sample_to(drop_sequences, drop_sequence, drop_sequences_increment, seq);
@@ -1851,7 +1859,7 @@ long long write_tile(decompressor *geoms, std::atomic<long long> *geompos_in, ch
unsigned long long sfindex = sf.index;
if (sf.geometry.size() > 0) {
if (features.size() > scaled_max_tile_size) {
if (lead_features_count > max_tile_size) {
// Even being maximally conservative, each feature is still going to be
// at least one byte in the output tile, so this can't possibly work.
skipped++;
@@ -1863,6 +1871,14 @@ long long write_tile(decompressor *geoms, std::atomic<long long> *geompos_in, ch
sf.full_values.emplace_back(mvt_bool, "true");
}
if (sf.dropped == FEATURE_KEPT) {
multiplier_cluster_size = 1;
lead_features_count++;
} else {
multiplier_cluster_size++;
other_multiplier_cluster_features_count++;
}
for (auto &p : sf.edge_nodes) {
shared_nodes.push_back(std::move(p));
}
@@ -1957,6 +1973,13 @@ long long write_tile(decompressor *geoms, std::atomic<long long> *geompos_in, ch
first_time = false;
// Adjust tile size limit based on the ratio of multiplier cluster features to lead features
if (lead_features_count == 0) { // how can this happen?
lead_features_count = 1;
}
size_t scaled_max_tile_size = max_tile_size * (lead_features_count + other_multiplier_cluster_features_count) / lead_features_count;
// printf("%d/%d/%d: given %zu lead features and %zu cluster features, tile size is %zu\n", z, tx, ty, lead_features_count, other_multiplier_cluster_features_count, scaled_max_tile_size);
// Operations on the features within each layer:
//
// Tag features with their sequence within the layer, if required for --retain-points-multiplier