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      switch (pass)
      {
        case 0:
        default:
        {
          offset+=8;
          if (offset >= (long) image->rows)
            {
              pass++;
              offset=4;

              /* interlaced gif does not work with only 3 rows */
              if (offset >= (long) image->rows) {
                  /* skip pass 1 */
                  pass++;
                  offset=2;
              }
              if (offset >= (long) image->rows) {
                  /* skip pass 2 */
                  pass++;
                  offset=1;
              }
            }
          break;
        }