Function cellAt

src/ink/screen.ts:634–638

(screen: Screen, x: number, y: number)

 * this is intentional as cells are stored packed, not as objects.
 */
export function cellAt(screen: Screen, x: number, y: number): Cell | undefined {
  if (x < 0 || y < 0 || x >= screen.width || y >= screen.height)
    return undefined
  return cellAtIndex(screen, y * screen.width + x)
}
/**
 * Get a Cell view by pre-computed array index. Skips bounds checks and
 * index computation — caller must ensure index is valid.