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c++: change entries function to TMS order

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This commit is contained in:
Brandon Liu
2022-12-19 22:52:28 +08:00
parent 07c769d1e2
commit d2a27d03b1
2 changed files with 14 additions and 7 deletions
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11
cpp/pmtiles.hpp
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@@ -338,6 +338,7 @@ int write_varint(std::back_insert_iterator<std::string> data, uint64_t value) {
return n;
}
// TMS order
struct {
bool operator()(entry_zxy a, entry_zxy b) const {
if (a.z != b.z) {
@@ -346,7 +347,7 @@ struct {
if (a.x != b.x) {
return a.x < b.x;
}
return a.y < b.y;
return a.y > b.y;
}
} colmajor_cmp;
@@ -524,14 +525,14 @@ inline std::tuple<std::string, std::string, int> make_root_leaves(const std::fun
}
}
inline void collect_entries_zxy(const std::function<std::string(const std::string &, uint8_t)> decompress, std::vector<entry_zxy> &tile_entries, const char *pmtiles_map, const headerv3 &h, uint64_t dir_offset, uint64_t dir_len) {
inline void collect_entries(const std::function<std::string(const std::string &, uint8_t)> decompress, std::vector<entry_zxy> &tile_entries, const char *pmtiles_map, const headerv3 &h, uint64_t dir_offset, uint64_t dir_len) {
std::string dir_s{pmtiles_map + dir_offset, dir_len};
std::string decompressed_dir = decompress(dir_s, h.internal_compression);
auto dir_entries = pmtiles::deserialize_directory(decompressed_dir);
for (auto const &entry : dir_entries) {
if (entry.run_length == 0) {
collect_entries_zxy(decompress, tile_entries, pmtiles_map, h, h.leaf_dirs_offset + entry.offset, entry.length);
collect_entries(decompress, tile_entries, pmtiles_map, h, h.leaf_dirs_offset + entry.offset, entry.length);
} else {
for (uint64_t i = entry.tile_id; i < entry.tile_id + entry.run_length; i++) {
pmtiles::zxy zxy = pmtiles::tileid_to_zxy(i);
@@ -541,13 +542,13 @@ inline void collect_entries_zxy(const std::function<std::string(const std::strin
}
}
inline std::vector<entry_zxy> entries_zxy(const std::function<std::string(const std::string &, uint8_t)> decompress, const char *pmtiles_map) {
inline std::vector<entry_zxy> entries_tms(const std::function<std::string(const std::string &, uint8_t)> decompress, const char *pmtiles_map) {
std::string header_s{pmtiles_map, 127};
auto header = pmtiles::deserialize_header(header_s);
std::vector<entry_zxy> tile_entries;
collect_entries_zxy(decompress, tile_entries, pmtiles_map, header, header.root_dir_offset, header.root_dir_bytes);
collect_entries(decompress, tile_entries, pmtiles_map, header, header.root_dir_offset, header.root_dir_bytes);
std::sort(tile_entries.begin(), tile_entries.end(), colmajor_cmp);
return tile_entries;
}

10
cpp/test.cpp
View File

@@ -173,10 +173,16 @@ MU_TEST(test_build_dirs) {
fstat(fd, &st);
char *map = (char *) mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
auto result = entries_zxy(&mydecompress, map);
auto result = entries_tms(&mydecompress, map);
mu_check(result.size() == 100000);
// 1 4
// 2 3
// in TMS order, 2, 1, 3, 4
mu_check(result[0].offset == header.tile_data_offset);
mu_check(result[1].offset == header.tile_data_offset);
mu_check(result[1].offset == header.tile_data_offset + 2);
mu_check(result[2].offset == header.tile_data_offset);
mu_check(result[3].offset == header.tile_data_offset + 2);
mu_check(result[4].offset == header.tile_data_offset + 4);
for (int i = 0; i < 100000; i += 31) {
auto zxy = tileid_to_zxy(i);