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Gzip -9 tiles. Don't bother writing tiles whose features all got clipped away.

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Eric Fischer 2014-11-20 14:31:50 -08:00
parent 82c0f67813
commit bb13dc03e5
1 changed files with 18 additions and 14 deletions
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32
tile.cc
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@ -35,7 +35,7 @@ static inline int compress(std::string const& input, std::string& output) {
deflate_s.opaque = Z_NULL; deflate_s.opaque = Z_NULL;
deflate_s.avail_in = 0; deflate_s.avail_in = 0;
deflate_s.next_in = Z_NULL; deflate_s.next_in = Z_NULL;
deflateInit2(&deflate_s, Z_DEFAULT_COMPRESSION, Z_DEFLATED, 31, 8, Z_DEFAULT_STRATEGY); deflateInit2(&deflate_s, Z_BEST_COMPRESSION, Z_DEFLATED, 31, 8, Z_DEFAULT_STRATEGY);
deflate_s.next_in = (Bytef *)input.data(); deflate_s.next_in = (Bytef *)input.data();
deflate_s.avail_in = input.size(); deflate_s.avail_in = input.size();
size_t length = 0; size_t length = 0;
@ -470,26 +470,30 @@ long long write_tile(struct index *start, struct index *end, char *metabase, uns
} }
} }
mapnik::vector::tile tile = create_tile(layername, line_detail, features, &count, &keys, &values); if (features.size() > 0) {
mapnik::vector::tile tile = create_tile(layername, line_detail, features, &count, &keys, &values);
pool_free(&keys); pool_free(&keys);
pool_free(&values); pool_free(&values);
std::string s; std::string s;
std::string compressed; std::string compressed;
tile.SerializeToString(&s); tile.SerializeToString(&s);
compress(s, compressed); compress(s, compressed);
if (compressed.size() > 500000) { if (compressed.size() > 500000) {
fprintf(stderr, "tile %d/%u/%u size is %lld with detail %d, >500000 \n", z, tx, ty, (long long) compressed.size(), line_detail); fprintf(stderr, "tile %d/%u/%u size is %lld with detail %d, >500000 \n", z, tx, ty, (long long) compressed.size(), line_detail);
if (line_detail == MIN_DETAIL || !evaluated) { if (line_detail == MIN_DETAIL || !evaluated) {
evaluated = true; evaluated = true;
evaluate(features, metabase, file_keys, layername, line_detail, compressed.size()); evaluate(features, metabase, file_keys, layername, line_detail, compressed.size());
}
} else {
mbtiles_write_tile(outdb, z, tx, ty, compressed.data(), compressed.size());
return count;
} }
} else { } else {
mbtiles_write_tile(outdb, z, tx, ty, compressed.data(), compressed.size());
return count; return count;
} }
} }