Horror film visionary Wes Craven died Sunday after a battle with brain cancer. He was 76. He reinvented the horror genre several times over the course of his decades-long career. “Nightmare on Elm Street” introduced a terrified generation to Freddy Krueger. And “Scream” gave us both a slick, self-aware reworking of the genre, and an abiding fear of those black-and-white masks.