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Don't try to revive continous polygons if they collapse away

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Erica Fischer
2023-10-20 08:40:59 -07:00
parent a1ce734977
commit 67cb8c566f
3 changed files with 54 additions and 21 deletions
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tile.cpp
+9 -3
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@@ -609,9 +609,12 @@ void *partial_feature_worker(void *v) {
signed char t = (*partials)[i].t;
int z = (*partials)[i].z;
int tx = (*partials)[i].tx;
int ty = (*partials)[i].ty;
int out_detail = (*partials)[i].extra_detail;
drawvec geom = (*partials)[i].geoms[0];
drawvec before_scaling = (*partials)[i].geoms[0];
to_tile_scale(geom, z, out_detail);
if (t == VT_POLYGON) {
@@ -625,8 +628,11 @@ void *partial_feature_worker(void *v) {
check_polygon(geom);
}
if (geom.size() < 3) {
if (area > 0) {
if (geom.size() < 4) {
// Don't try to revive a continuous polygon, because we should be
// able to rely on its three fixed points to keep it alive if it
// actually has any area at this zoom level.
if (area > 0 && can_be_dust(before_scaling, 0, before_scaling.size(), z, tx, ty, a->shared_nodes_map, a->nodepos)) {
// area is in world coordinates, calculated before scaling down
geom = revive_polygon(before, area, z, out_detail);
} else {
@@ -2207,7 +2213,7 @@ long long write_tile(decompressor *geoms, std::atomic<long long> *geompos_in, ch
bool prevent_tiny = prevent[P_TINY_POLYGON_REDUCTION] ||
(prevent[P_TINY_POLYGON_REDUCTION_AT_MAXZOOM] && z == maxzoom);
if (!prevent_tiny && !additional[A_GRID_LOW_ZOOMS]) {
sf.geometry = reduce_tiny_poly(sf.geometry, z, line_detail, &still_need_simplification_after_reduction, &simplified_away_by_reduction, &accum_area, &sf, &tiny_feature);
sf.geometry = reduce_tiny_poly(sf.geometry, z, tx, ty, line_detail, &still_need_simplification_after_reduction, &simplified_away_by_reduction, &accum_area, &sf, &tiny_feature, shared_nodes_map, nodepos);
if (simplified_away_by_reduction) {
strategy->tiny_polygons++;
}