uncompact method

@override List<BigInt> uncompact(List<BigInt> compactedHexagons, { required int resolution, })

Uncompact a compacted set of hexagons to hexagons of the same resolution

Implementation

@override
List<BigInt> uncompact(
  List<BigInt> compactedHexagons, {
  required int resolution,
}) {
  assert(resolution >= 0 && resolution < 16,
      'Resolution must be in [0, 15] range');

  return using((arena) {
    final compactedHexagonsPointer = arena<Uint64>(compactedHexagons.length);
    for (var i = 0; i < compactedHexagons.length; i++) {
      final pointer = Pointer<Uint64>.fromAddress(
        compactedHexagonsPointer.address + sizeOf<Uint64>() * i,
      );
      pointer.value = compactedHexagons[i].toInt();
    }

    final maxUncompactSize = _h3c.maxUncompactSize(
      compactedHexagonsPointer,
      compactedHexagons.length,
      resolution,
    );

    if (maxUncompactSize < 0) {
      throw H3Exception('Failed to uncompact');
    }

    final out = arena<Uint64>(maxUncompactSize);
    final resultCode = _h3c.uncompact(
      compactedHexagonsPointer,
      compactedHexagons.length,
      out,
      maxUncompactSize,
      resolution,
    );
    if (resultCode != 0) {
      throw H3Exception('Failed to uncompact');
    }

    final list = out.asTypedList(maxUncompactSize).toList();
    return list.where((e) => e != 0).map((e) => e.toBigInt()).toList();
  });
}