LuaTeX+Google SansでGoogleロゴ

google-logo-ligature.tex

% Product Sansにはリガチャでロゴ全体のグリフ「も」ある
\documentclass{standalone}
\usepackage{fontspec}
\setmonofont{ProductSans-Regular.ttf}[
    RawFeature=+calt    % Contextual ligatures
]
\begin{document}
\verb|google_logo|
\end{document}

google-logo.tex

% Google Sansにはロゴの各文字のグリフがある
\documentclass{standalone}
\usepackage{fontspec}
\usepackage{luacode}
\usepackage{xcolor}
\setmainfont{GoogleSans-Regular.ttf}

\begin{document}
\begin{luacode}
  local font_id = font.current()
  local glyph_ids = {983070, 983103, 983103, 983101, 983102, 983100}
  local head = nil
  local tail = nil

  for _, gid in ipairs(glyph_ids) do
    local glyph_node = node.new("glyph")
    glyph_node.font = font_id
    glyph_node.char = gid

    if not head then
      head = glyph_node
      tail = glyph_node
    else
      tail.next = glyph_node
      glyph_node.prev = tail
      tail = glyph_node
    end
  end

  -- 水平ボックスにまとめる
  local hbox = node.hpack(head)
  node.write(hbox)
\end{luacode}

\end{document}

google-sans.tex

% グリフIDの一覧を取得するのに使ったコード
\documentclass{article}
\usepackage{fontspec}
\usepackage{luacode}
\setmainfont{ProductSans-Regular.ttf}

\begin{document}

\leavevmode

\begin{luacode}
  local font_id = font.current() -- 現在のフォント ID を取得
  local font_data = font.getfont(font_id) -- フォントデータを取得

  -- ノードリストを構築
  local head = nil -- リストの先頭ノード
  local tail = nil -- 現在の末尾ノード

  for gid, char_data in pairs(font_data.characters) do
    -- Glyph ID を表す文字列全体を1つの hbox にまとめる
    local text = string.format("GID: %d ", gid)
    local text_head = nil
    local text_tail = nil

    for i = 1, #text do
      local char_node = node.new("glyph")
      char_node.font = font_id
      char_node.char = string.byte(text, i)

      if not text_head then
        text_head = char_node
        text_tail = char_node
      else
        text_tail.next = char_node
        char_node.prev = text_tail
        text_tail = char_node
      end
    end
    
    local glyph_node = node.new("glyph")
    glyph_node.font = font_id
    glyph_node.char = gid
    text_tail.next = glyph_node
    text_tail = glyph_node
    
    local text_hbox = node.hpack(text_head) -- テキスト全体を1つの hbox にまとめ
    
    if not head then
      head = text_hbox
      tail = text_hbox
    else
      tail.next = text_hbox
      text_hbox.prev = tail
      tail = text_hbox
    end
    
    local break_node = node.new("glue")
    tail.next = break_node
    break_node.prev = tail
    tail = break_node
  end

  node.write(head)
\end{luacode}

\end{document}