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Convert label anchors earlier in tiling to keep from getting stuck later

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This commit is contained in:
Erica Fischer
2025-04-28 12:56:15 -07:00
parent a52d15a0b1
commit 03647fb4a5
1 changed files with 18 additions and 18 deletions
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tile.cpp
+18 -18
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@@ -687,16 +687,8 @@ static void *simplification_worker(void *v) {
int out_detail = (*features)[i]->extra_detail;
drawvec geom = (*features)[i]->geometry;
if (geom.size() == 0) {
fprintf(stderr, "0 after simplification\n");
}
to_tile_scale(geom, z, out_detail);
if (geom.size() == 0) {
fprintf(stderr, "0 after scale\n");
}
if (t == VT_POLYGON) {
// Scaling may have made the polygon degenerate.
// Give Clipper a chance to try to fix it.
@@ -727,19 +719,10 @@ static void *simplification_worker(void *v) {
}
}
if (geom.size() == 0) {
fprintf(stderr, "0 after cleaning, area had been %f\n", area);
}
if (t == VT_POLYGON && additional[A_GENERATE_POLYGON_LABEL_POINTS]) {
t = (*features)[i]->t = VT_POINT;
geom = checkerboard_anchors(from_tile_scale(geom, z, out_detail), (*features)[i]->tx, (*features)[i]->ty, z, (*features)[i]->label_point);
to_tile_scale(geom, z, out_detail);
}
if ((*features)[i]->index == 0) {
(*features)[i]->index = i;
}
#if 0
if (geom.size() == 0 && !additional[A_GRID_LOW_ZOOMS]) {
fprintf(stderr, "simplified away to nothing\n");
for (auto const &g : geom) {
@@ -748,6 +731,7 @@ static void *simplification_worker(void *v) {
fprintf(stderr, "\n");
exit(EXIT_FAILURE);
}
#endif
(*features)[i]->geometry = std::move(geom);
}
@@ -2102,6 +2086,22 @@ long long write_tile(decompressor *geoms, std::atomic<long long> *geompos_in, ch
}
}
// Make label anchors early in tiling, even though it requires simplifying early,
// so that if there is no label anchor for this feature in this tile,
// we find out now rather than after we have already decided that there
// are too_many_bytes.
if (sf.t == VT_POLYGON && additional[A_GENERATE_POLYGON_LABEL_POINTS]) {
drawvec ngeom = simplify_lines(sf.geometry, z, tx, ty, line_detail, !(prevent[P_CLIPPING] || prevent[P_DUPLICATION]), sf.simplification, sf.t == VT_POLYGON ? 4 : 0, shared_nodes, NULL, 0, "");
if (ngeom.size() == 0) {
continue;
}
sf.geometry = checkerboard_anchors(ngeom, tx, ty, z, sf.label_point);
if (sf.geometry.size() == 0) {
continue;
}
sf.t = VT_POINT;
}
unsigned long long sfindex = sf.index;
if (sf.geometry.size() > 0) {