Buried in a news item yesterday about the movie “Lego Batman,” The Hollywood Reporter mentioned offhandedly that actor Michael Cera has acquired the rights to “Masters of Atlantis,” the brilliant, absurdist cult-farce by Little Rock author Charles Portis. “Cera aims to write the adaptation as not only an acting vehicle but a directing project as well,” they report. Depending on your opinion of Cera, this seems like grounds for cautious optimism. His roles in films like “Crystal Fairy & the Magical Cactus” probably prove he can handle the kind of offbeat, uncomfortable humor and tone that make the book great — either way, it’s another advance in the ongoing Portis renaissance.