code: private ColorRgba getTileColor(Tile tile)
      {
          final ColorRgba color;
          if (tile == null)
          {
              color = NO_TILE;
          }
          else
          {
              final TileRef ref = new TileRef(tile.getSheet(), tile.getNumber());
              if (!pixels.containsKey(ref))
              {
                  color = DEFAULT_COLOR;
              }
              else
              {
                  color = pixels.get(ref);
              }
          }
          return color;
      }
docs: Get the corresponding tile color.
  
  @param tile The tile reference.
  @return The tile color representation.