MagickPrivate const Quantum *GetVirtualPixelsNexus(const Cache cache,
  NexusInfo *magick_restrict nexus_info)
{
  CacheInfo
    *magick_restrict cache_info;

  assert(cache != (Cache) NULL);
  cache_info=(CacheInfo *) cache;
  assert(cache_info->signature == MagickCoreSignature);
  if (cache_info->storage_class == UndefinedClass)
    return((Quantum *) NULL);
  return((const Quantum *) nexus_info->pixels);
}
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