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Trying clipping in rewrite instead of in next_feature

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This commit is contained in:
Erica Fischer
2024-02-02 11:04:24 -08:00
parent bddfb34ea2
commit 0d5d539f4b
1 changed files with 50 additions and 21 deletions
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tile.cpp
+50 -21
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@@ -66,6 +66,8 @@ extern "C" {
pthread_mutex_t db_lock = PTHREAD_MUTEX_INITIALIZER;
pthread_mutex_t var_lock = PTHREAD_MUTEX_INITIALIZER;
bool clip_to_tile(serial_feature &sf, int z, long long buffer, bool check_bbox);
std::vector<mvt_geometry> to_feature(drawvec &geom) {
std::vector<mvt_geometry> out;
@@ -442,10 +444,10 @@ void rewrite(drawvec &geom, int z, int nextzoom, int maxzoom, long long *bbox, u
sx = tx << (32 - z);
sy = ty << (32 - z);
}
drawvec geom2;
geom2.reserve(geom.size());
for (size_t i = 0; i < geom.size(); i++) {
geom2.push_back(draw(geom[i].op, SHIFT_RIGHT(geom[i].x + sx), SHIFT_RIGHT(geom[i].y + sy)));
geom2.push_back(draw(geom[i].op, geom[i].x + sx, geom[i].y + sy));
}
for (xo = bbox2[0]; xo <= bbox2[2]; xo++) {
@@ -474,14 +476,6 @@ void rewrite(drawvec &geom, int z, int nextzoom, int maxzoom, long long *bbox, u
(child_shards - 1);
{
if (!within[j]) {
serialize_int(geomfile[j]->fp, nextzoom, &geompos[j], fname);
serialize_uint(geomfile[j]->fp, tx * span + xo, &geompos[j], fname);
serialize_uint(geomfile[j]->fp, ty * span + yo, &geompos[j], fname);
geomfile[j]->begin();
within[j] = 1;
}
serial_feature sf;
sf.layer = layer;
sf.segment = segment;
@@ -493,20 +487,47 @@ void rewrite(drawvec &geom, int z, int nextzoom, int maxzoom, long long *bbox, u
sf.tippecanoe_minzoom = tippecanoe_minzoom;
sf.has_tippecanoe_maxzoom = tippecanoe_maxzoom != -1;
sf.tippecanoe_maxzoom = tippecanoe_maxzoom;
sf.geometry = geom2;
sf.index = index;
sf.label_point = label_point;
sf.extent = extent;
sf.feature_minzoom = feature_minzoom;
for (size_t i = 0; i < metakeys.size(); i++) {
sf.keys.push_back(metakeys[i]);
sf.values.push_back(metavals[i]);
// clip_to_tile unscaled but tile-relative coordinates
sf.geometry = geom2;
for (auto &g : sf.geometry) {
g.x -= jx << (32 - nextzoom);
g.y -= jy << (32 - nextzoom);
}
std::string feature = serialize_feature(&sf, SHIFT_RIGHT(initial_x[segment]), SHIFT_RIGHT(initial_y[segment]));
geomfile[j]->serialize_long_long(feature.size(), &geompos[j], fname);
geomfile[j]->fwrite_check(feature.c_str(), sizeof(char), feature.size(), &geompos[j], fname);
// printf("%d/%d/%d: %lld,%lld <==\n", nextzoom, jx, jy, sf.geometry[0].x, sf.geometry[0].y);
clip_to_tile(sf, nextzoom, buffer, false);
if (sf.geometry.size() > 0) {
// serialize_feature wants world coordinates, downscaled
for (auto &g : sf.geometry) {
g.x = SHIFT_RIGHT(g.x + (jx << (32 - nextzoom)));
g.y = SHIFT_RIGHT(g.y + (jy << (32 - nextzoom)));
}
for (size_t i = 0; i < metakeys.size(); i++) {
sf.keys.push_back(metakeys[i]);
sf.values.push_back(metavals[i]);
}
std::string feature = serialize_feature(&sf, SHIFT_RIGHT(initial_x[segment]), SHIFT_RIGHT(initial_y[segment]));
if (!within[j]) {
serialize_int(geomfile[j]->fp, nextzoom, &geompos[j], fname);
serialize_uint(geomfile[j]->fp, jx, &geompos[j], fname);
serialize_uint(geomfile[j]->fp, jy, &geompos[j], fname);
geomfile[j]->begin();
within[j] = 1;
}
geomfile[j]->serialize_long_long(feature.size(), &geompos[j], fname);
geomfile[j]->fwrite_check(feature.c_str(), sizeof(char), feature.size(), &geompos[j], fname);
} else {
printf("clipped away\n");
}
}
}
}
@@ -1460,8 +1481,13 @@ struct write_tile_args {
size_t nodepos;
};
bool clip_to_tile(serial_feature &sf, int z, long long buffer) {
int quick = quick_check(sf.bbox, z, buffer);
// return true if the feature is entirely outside the tile
// returns false if it has some presence in the tile
bool clip_to_tile(serial_feature &sf, int z, long long buffer, bool check_bbox) {
int quick = 2; // must actually clip
if (check_bbox) {
quick = quick_check(sf.bbox, z, buffer);
}
if (z == 0) {
if (sf.bbox[0] <= (1LL << 32) * buffer / 256 || sf.bbox[2] >= (1LL << 32) - ((1LL << 32) * buffer / 256)) {
@@ -1538,7 +1564,7 @@ bool clip_to_tile(serial_feature &sf, int z, long long buffer) {
// sf.geometry is unchanged
}
} else {
sf.geometry = clipped;
sf.geometry = std::move(clipped);
}
}
@@ -1610,7 +1636,10 @@ serial_feature next_feature(decompressor *geoms, std::atomic<long long> *geompos
(*original_features)++;
if (clip_to_tile(sf, z, buffer)) {
// printf("%d/%d/%d: %lld,%lld\n", z, tx, ty, sf.geometry[0].x, sf.geometry[0].y);
if (clip_to_tile(sf, z, buffer, true)) {
printf("clipped away in %d\n", z);
continue;
}