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Implement and test retaining multipliers by bit prefix

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Erica Fischer
2025-02-11 10:30:22 -08:00
parent 260d404466
commit 285d1931af
5 changed files with 9949 additions and 0 deletions
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tile.cpp
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@@ -1255,6 +1255,11 @@ static serial_feature next_feature(decompressor *geoms, std::atomic<long long> *
} else if (preserve_multiplier_density_threshold > 0 &&
sf.index - next_feature_state.prev_not_dropped_index > ((1LL << (32 - z)) / preserve_multiplier_density_threshold) * ((1LL << (32 - z)) / preserve_multiplier_density_threshold)) {
sf.dropped = FEATURE_ADDED_FOR_MULTIPLIER_DENSITY;
} else if (preserve_multiplier_density_bits_by_zoom.size() > 0 &&
(size_t) z < preserve_multiplier_density_bits_by_zoom.size() &&
(sf.index >> (64 - preserve_multiplier_density_bits_by_zoom[z])) !=
(next_feature_state.prev_not_dropped_index >> (64 - preserve_multiplier_density_bits_by_zoom[z]))) {
sf.dropped = FEATURE_ADDED_FOR_MULTIPLIER_DENSITY;
} else {
sf.dropped = FEATURE_DROPPED;
}