Illustration of flip flags for Tiled working incorrectly

layer.dart

import "dart:typed_data";
import 'dart:convert';

void main() {
  const int FLIPPED_HORIZONTALLY_FLAG = 0x80000000;
  const int FLIPPED_VERTICALLY_FLAG = 0x40000000;
  const int FLIPPED_DIAGONALLY_FLAG = 0x20000000;

  String data = "PAAAAAAAAAAAAAAAAAAAADsAAAA7AAAAOgAAADEAAAA8AAAALgAAADsAAAAAAAAAAAAAAAAAAAAAAAAAAAAAADoAAAA7A" +
      "AAAAAAAAAAAAAAAAAAAOwAAADMAAAA0AAAANwAAAAAAAAA2AAAAOAAAAAAAAAAAAAAAAAAAAAAAAAA9AAAANQAAAD0AAAA0AAAAAAAAAAAAAA" +
      "AyAAAAAAAAAAAAAAAAAAAAOAAAADkAAAAAAAAAAAAAAAAAAAAAAAAAMgAAADYAAAA4AAAANwAAAAAAAAAAAAAAAAAAADUAAAAAAAAAAA" +
      "AAAAAAAAAvAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAOgAAAAAAAAAAAAAAHgAAAB4AAAAAAAAAMgAAADMAAAAxAAAAAAAAAAAAAAA" +
      "sAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAkAADgKgAAICQAABAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAlAAAAJAAAAAAAAAAAAAAAAAAAAAA" +
      "AAAAsAADgKgAAUAAAAAAAAAAAHgAAIB4AACAAAAAAAAAAAAAAAAAkAADgJQAAwCQAAAAAAAAAAAAAAAAAAAAkAAAgJAAAIAAAAAAkAAAQJAA" +
      "AEAAAAAAAAAAAHgAAICAAAAAkAADgAAAAAAAAAAAmAAAgAAAAAAAAAAAkAAAgJAAAICUAACAkAAAQAAAAAAAAAAAkAAAQJQAAEAAAAAAAAA" +
      "AAAAAAACQAACAkAAAgAAAAACQAABAeAAAgJAAAIAAAAAAAAAAAAAAAACQAABAkAAAQAAAAACQAAAAAAAAAHgAAAB4AAAAAAAAAAAAAAAAAA" +
      "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAACQAABAtAADgJAAAIAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA" +
      "AAAAAAAAAAAAAAAAAACQAACAkAAAgAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAACUAAAAAA" +
      "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAiAAAAAAAAAAAAAAAAAAAAAAAAAAA" +
      "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAIQAAgCAAAAAfAAAAJAAAEAAAAAAAAAAAAAAAAAAAAAAAAAAAAA" +
      "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAkAAAQJQAA4CUAACAkAAAQAAAAAAAAAAAAAAAAAAAAAA==";
  var bytes = _decodeBase64(data);

  var tileIndex = 0;
  for (var y = 0; y < 16; ++y) {
    for (var x = 0; x < 16; ++x) {
      var globalTileId = bytes[tileIndex] |
          bytes[tileIndex + 1] << 8 |
          bytes[tileIndex + 2] << 16 |
          bytes[tileIndex + 3] << 24;

      var unadjustedGid = globalTileId;

      tileIndex += 4;

      // Read out the flags
      final flippedHorizontally = (globalTileId & FLIPPED_HORIZONTALLY_FLAG) ==
          FLIPPED_HORIZONTALLY_FLAG;
      final flippedVertically =
          (globalTileId & FLIPPED_VERTICALLY_FLAG) == FLIPPED_VERTICALLY_FLAG;
      final flippedDiagonally =
          (globalTileId & FLIPPED_DIAGONALLY_FLAG) == FLIPPED_DIAGONALLY_FLAG;

      // Save rotation flags
//         tileFlips[y][x] = Flips(
//           flippedHorizontally,
//           flippedVertically,
//           flippedDiagonally,
//         );

      // Clear the flags
      globalTileId &= ~(FLIPPED_HORIZONTALLY_FLAG |
          FLIPPED_VERTICALLY_FLAG |
          FLIPPED_DIAGONALLY_FLAG);

      if (globalTileId != unadjustedGid) {
        print('[${tileIndex}:] gid: $globalTileId (before: $unadjustedGid)');
      }

      if (globalTileId > 100) {
        print(
            '[${tileIndex}:] *Incorrect id* after: $globalTileId (before: $unadjustedGid)');
      }

      if (flippedHorizontally || flippedVertically || flippedDiagonally) {
        print(
            '[${tileIndex}:] horizontal: $flippedHorizontally, vertical: $flippedVertically, diagonal: $flippedDiagonally');
      }
    }
  }
}

Uint8List _decodeBase64(String input) {
  final sanitized = input.trim();
  return base64.decode(sanitized);
}