Function cellAtCI

src/ink/screen.ts:656–664

* Write cell data into an existing Cell object to avoid allocation. * Caller must ensure index is valid.

(screen: Screen, ci: number, out: Cell)

 * Caller must ensure index is valid.
 */
function cellAtCI(screen: Screen, ci: number, out: Cell): void {
  const w1 = ci | 1
  const word1 = screen.cells[w1]!
  out.char = screen.charPool.get(screen.cells[ci]!)
  out.styleId = word1 >>> STYLE_SHIFT
  out.width = word1 & WIDTH_MASK
  const hid = (word1 >>> HYPERLINK_SHIFT) & HYPERLINK_MASK
  out.hyperlink = hid === 0 ? undefined : screen.hyperlinkPool.get(hid)
}

export function charInCellAt(
  screen: Screen,