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If the requested tile doesn't exist, try climbing up to a lower zoom

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This commit is contained in:
Eric Fischer
2014-10-27 16:00:16 -07:00
parent 984ac17d6c
commit ea7216641b
1 changed files with 32 additions and 18 deletions
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decode.cc
+32 -18
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@@ -105,32 +105,46 @@ void handle(std::string message, int z, unsigned x, unsigned y) {
void decode(char *fname, int z, unsigned x, unsigned y) { void decode(char *fname, int z, unsigned x, unsigned y) {
sqlite3 *db; sqlite3 *db;
int oz = z;
unsigned ox = x, oy = y;
if (sqlite3_open(fname, &db) != SQLITE_OK) { if (sqlite3_open(fname, &db) != SQLITE_OK) {
fprintf(stderr, "%s: %s\n", fname, sqlite3_errmsg(db)); fprintf(stderr, "%s: %s\n", fname, sqlite3_errmsg(db));
exit(EXIT_FAILURE); exit(EXIT_FAILURE);
} }
const char *sql = "SELECT tile_data from tiles where zoom_level = ? and tile_column = ? and tile_row = ?;"; int handled = 0;
sqlite3_stmt *stmt; while (z >= 0 && !handled) {
if (sqlite3_prepare_v2(db, sql, -1, &stmt, NULL) != SQLITE_OK) { const char *sql = "SELECT tile_data from tiles where zoom_level = ? and tile_column = ? and tile_row = ?;";
fprintf(stderr, "%s: select failed: %s\n", fname, sqlite3_errmsg(db)); sqlite3_stmt *stmt;
exit(EXIT_FAILURE); if (sqlite3_prepare_v2(db, sql, -1, &stmt, NULL) != SQLITE_OK) {
fprintf(stderr, "%s: select failed: %s\n", fname, sqlite3_errmsg(db));
exit(EXIT_FAILURE);
}
sqlite3_bind_int(stmt, 1, z);
sqlite3_bind_int(stmt, 2, x);
sqlite3_bind_int(stmt, 3, (1LL << z) - 1 - y);
while (sqlite3_step(stmt) == SQLITE_ROW) {
int len = sqlite3_column_bytes(stmt, 0);
const char *s = (const char *) sqlite3_column_blob(stmt, 0);
if (z != oz) {
fprintf(stderr, "%s: Warning: using tile %d/%u/%u instead of %d/%u/%u\n", fname, z, x, y, oz, ox, oy);
}
handle(std::string(s, len), z, x, y);
handled = 1;
}
sqlite3_finalize(stmt);
z--;
x /= 2;
y /= 2;
} }
sqlite3_bind_int(stmt, 1, z);
sqlite3_bind_int(stmt, 2, x);
sqlite3_bind_int(stmt, 3, (1LL << z) - 1 - y);
while (sqlite3_step(stmt) == SQLITE_ROW) {
int len = sqlite3_column_bytes(stmt, 0);
const char *s = (const char *) sqlite3_column_blob(stmt, 0);
handle(std::string(s, len), z, x, y);
}
sqlite3_finalize(stmt);
if (sqlite3_close(db) != SQLITE_OK) { if (sqlite3_close(db) != SQLITE_OK) {
fprintf(stderr, "%s: could not close database: %s\n", fname, sqlite3_errmsg(db)); fprintf(stderr, "%s: could not close database: %s\n", fname, sqlite3_errmsg(db));
exit(EXIT_FAILURE); exit(EXIT_FAILURE);