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Allocate clipids as needed

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This commit is contained in:
Eric Fischer 2018-06-11 15:21:37 -07:00
parent aff8633926
commit bdf23de189
1 changed files with 39 additions and 0 deletions
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39
decode.cpp
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@ -86,6 +86,44 @@ void do_stats(mvt_tile &tile, size_t size, bool compressed, int z, unsigned x, u
}
void split_feature(mvt_layer const &layer, mvt_feature const &feature, std::vector<std::vector<mvt_tile>> subtiles, size_t n) {
static long clipid_pool = 0;
const std::vector<mvt_geometry> &geom = feature.geometry;
long extent = layer.extent;
// Calculate bounding box of feature
long minx = LONG_MAX;
long miny = LONG_MAX;
long maxx = LONG_MIN;
long maxy = LONG_MIN;
for (size_t i = 0; i < geom.size(); i++) {
if (geom[i].op == mvt_moveto || geom[i].op == mvt_lineto) {
if (geom[i].x < minx) {
minx = geom[i].x;
}
if (geom[i].y < miny) {
miny = geom[i].y;
}
if (geom[i].x > maxx) {
maxx = geom[i].x;
}
if (geom[i].y > maxy) {
maxy = geom[i].y;
}
}
}
// Is it bigger than one sub-tile?
// If so, generate an ID for matching
// XXX Is this right for edges on the border?
long nclipid = 0;
if (minx / (extent << n) != maxx / (extent << n) ||
miny / (extent << n) != maxy / (extent << n)) {
nclipid = ++clipid_pool;
}
// Set up a corresponding feature within each sub-tile
// (Empty features will have to get torn down later)
@ -97,6 +135,7 @@ void split_feature(mvt_layer const &layer, mvt_feature const &feature, std::vect
nf.type = feature.type;
nf.id = feature.id;
nf.has_id = feature.has_id;
nf.clipid = nclipid;
mvt_tile &nt = subtiles[x][y];
mvt_layer &nl = nt.layers[nt.layers.size() - 1];