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Factoring out dot-dropping for unit testing

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This commit is contained in:
Erica Fischer
2023-07-17 16:29:38 -07:00
parent 4318e964e3
commit daf16e915c
7 changed files with 116 additions and 79 deletions
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main.cpp
+1 -63
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@@ -65,6 +65,7 @@
#include "text.hpp"
#include "errors.hpp"
#include "read_json.hpp"
#include "drop.hpp"
static int low_detail = 12;
static int full_detail = -1;
@@ -90,7 +91,6 @@ size_t limit_tile_feature_count = 0;
size_t limit_tile_feature_count_at_maxzoom = 0;
unsigned int drop_denser = 0;
std::map<std::string, serial_val> set_attributes;
unsigned long long preserve_point_density_threshold = 0;
std::vector<order_field> order_by;
bool order_reverse;
@@ -274,13 +274,6 @@ static void insert(struct mergelist *m, struct mergelist **head, unsigned char *
*head = m;
}
struct drop_state {
double gap;
unsigned long long previndex;
double interval;
double seq; // floating point because interval is
};
struct drop_densest {
unsigned long long gap;
size_t seq;
@@ -291,61 +284,6 @@ struct drop_densest {
}
};
int calc_feature_minzoom(struct index *ix, struct drop_state *ds, int maxzoom, double gamma) {
int feature_minzoom = 0;
if (gamma >= 0 && (ix->t == VT_POINT ||
(additional[A_LINE_DROP] && ix->t == VT_LINE) ||
(additional[A_POLYGON_DROP] && ix->t == VT_POLYGON))) {
for (ssize_t i = maxzoom; i >= 0; i--) {
ds[i].seq++;
}
ssize_t chosen = maxzoom + 1;
for (ssize_t i = maxzoom; i >= 0; i--) {
if (ds[i].seq < 0) {
feature_minzoom = i + 1;
// The feature we are pushing out
// appears in zooms i + 1 through maxzoom,
// so track where that was so we can make sure
// not to cluster something else that is *too*
// far away into it.
for (ssize_t j = i + 1; j <= maxzoom; j++) {
ds[j].previndex = ix->ix;
}
chosen = i + 1;
break;
} else {
ds[i].seq -= ds[i].interval;
}
}
// If this feature has been chosen only for a high zoom level,
// check whether at a low zoom level it is nevertheless too far
// from the last feature chosen for that low zoom, in which case
// we will go ahead and push it out.
if (preserve_point_density_threshold > 0) {
for (ssize_t i = 0; i < chosen && i < maxzoom; i++) {
if (ix->ix - ds[i].previndex > ((1LL << (32 - i)) / preserve_point_density_threshold) * ((1LL << (32 - i)) / preserve_point_density_threshold)) {
feature_minzoom = i;
for (ssize_t j = i; j <= maxzoom; j++) {
ds[j].previndex = ix->ix;
}
break;
}
}
}
// XXX manage_gap
}
return feature_minzoom;
}
static void merge(struct mergelist *merges, size_t nmerges, unsigned char *map, FILE *indexfile, int bytes, char *geom_map, FILE *geom_out, std::atomic<long long> *geompos, long long *progress, long long *progress_max, long long *progress_reported, int maxzoom, double gamma, struct drop_state *ds) {
struct mergelist *head = NULL;