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Tiles are smaller if coalesced features are sorted geographically

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This commit is contained in:
Eric Fischer 2014-09-29 15:38:33 -07:00
parent a08e57357a
commit 98b0cb5e3f
1 changed files with 21 additions and 1 deletions
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22
tile.cc
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@ -444,6 +444,8 @@ struct coalesce {
int nmeta;
int *meta;
unsigned long long index;
};
int coalcmp(const void *v1, const void *v2) {
@ -467,6 +469,23 @@ int coalcmp(const void *v1, const void *v2) {
return c1->nmeta - c2->nmeta;
}
int coalindexcmp(const void *v1, const void *v2) {
int cmp = coalcmp(v1, v2);
if (cmp == 0) {
const struct coalesce *c1 = (const struct coalesce *) v1;
const struct coalesce *c2 = (const struct coalesce *) v2;
if (c1->index < c2->index) {
return -1;
} else if (c1->index > c2->index) {
return 1;
}
}
return cmp;
}
long long write_tile(struct index *start, struct index *end, char *metabase, unsigned *file_bbox, int z, unsigned tx, unsigned ty, int detail, int basezoom, struct pool *file_keys, char *layername, sqlite3 *outdb) {
GOOGLE_PROTOBUF_VERIFY_VERSION;
@ -546,6 +565,7 @@ long long write_tile(struct index *start, struct index *end, char *metabase, uns
pv->n = 0;
features[nfeatures].type = t;
features[nfeatures].index = i->index;
features[nfeatures].ngeom = len;
features[nfeatures].geom = (struct draw *) malloc(len * sizeof(struct draw));
@ -575,7 +595,7 @@ long long write_tile(struct index *start, struct index *end, char *metabase, uns
}
}
qsort(features, nfeatures, sizeof(struct coalesce), coalcmp);
qsort(features, nfeatures, sizeof(struct coalesce), coalindexcmp);
int x;
int out = 0;