code: def compile(self, ttFont):
      version = 0
      offsetToSVGDocIndex = SVG_format_0Size  # I start the SVGDocIndex right after the header.
      # get SGVDoc info.
      docList = []
      entryList = []
      numEntries = len(self.docList)
      datum = struct.pack(">H", numEntries)
      entryList.append(datum)
      curOffset = len(datum) + doc_index_entry_format_0Size * numEntries
      seenDocs = {}
      allCompressed = getattr(self, "compressed", False)
      for i, doc in enumerate(self.docList):
          if isinstance(doc, (list, tuple)):
              doc = SVGDocument(*doc)
              self.docList[i] = doc
          docBytes = tobytes(doc.data, encoding="utf_8")
          if (
              allCompressed or doc.compressed
          ) and not docBytes.startswith(b"\x1f\x8b"):
              import gzip
  
              bytesIO = BytesIO()
              # mtime=0 strips the useless timestamp and makes gzip output reproducible;
              # equivalent to `gzip -n`
              with gzip.GzipFile(
                  None, "w", fileobj=bytesIO, mtime=0
              ) as gzipper:
                  gzipper.write(docBytes)
              gzipped = bytesIO.getvalue()
              if len(gzipped) < len(docBytes):
                  docBytes = gzipped
              del gzipped, bytesIO
          docLength = len(docBytes)
          if docBytes in seenDocs:
              docOffset = seenDocs[docBytes]
          else:
              docOffset = curOffset
              curOffset += docLength
              seenDocs[docBytes] = docOffset
              docList.append(docBytes)
          entry = struct.pack(
              ">HHLL",
              doc.startGlyphID,
              doc.endGlyphID,
              docOffset,
              docLength,
          )
          entryList.append(entry)
      entryList.extend(docList)
      svgDocData = bytesjoin(entryList)
  
      reserved = 0
      header = struct.pack(
          ">HLL", version, offsetToSVGDocIndex, reserved
      )
      data = [header, svgDocData]
      data = bytesjoin(data)
      return data
  
imports: from fontTools.misc.textTools import bytesjoin, safeEval, strjoin, tobytes, tostr
  from fontTools.misc import sstruct
  from .None import DefaultTable
  from collections.abc import Sequence
  from dataclasses import dataclass, astuple
  from io import BytesIO
  import struct
  import logging
label_desc: Use image node_id 2 for calling the table_S_V_G_ obj's underlying member method code with example usage: obj.compile(ttFont) and returns: data