NScumm.Sky.AutoRoute.DoAutoRoute C# (CSharp) Method

        public ushort DoAutoRoute(Compact cpt)
        {
            var cptScreen = (byte)cpt.Core.screen;
            var cptWidth = (byte)SkyCompact.GetMegaSet(cpt).gridWidth;
            InitWalkGrid(cptScreen, cptWidth);

            byte startX, startY, destX, destY;
            short initStaX, initStaY, initDestX, initDestY;

            ClipCoordX(cpt.Core.xcood, out startX, out initStaX);
            ClipCoordY(cpt.Core.ycood, out startY, out initStaY);
            ClipCoordX(cpt.Core.arTargetX, out destX, out initDestX);
            ClipCoordY(cpt.Core.arTargetY, out destY, out initDestY);

            var raw = _skyCompact.FetchCptRaw(cpt.Core.animScratchId);
            Array.Clear(raw, 0, 64);
            var routeDest = new UShortAccess(raw, 0);
            if ((startX == destX) && (startY == destY))
                return 2;

            var routeGrid = new UShortAccess(_routeGrid, 0);
            if (routeGrid[(destY + 1) * RouteGridWidth + destX + 1] != 0)
            {
                //if ((cpt == &Sky::SkyCompact::foster) && (cptScreen == 12) && (destX == 2) && (destY == 14)) {
                if (_skyCompact.CptIsId(cpt, (ushort)CptIds.Foster) && (cptScreen == 12) && (destX == 2) &&
                    (destY == 14))
                {
                    /* workaround for Scriptbug #1043047
                       In screen 12 (the pipe factory) Joey can block Foster's target
                       coordinates (2/14). This is normally not too tragic, but in the
                       scene when foster gets thrown out by Lamb (first time you enter
                       the pipe factory), the game would enter an infinite loop. */
                    routeGrid[(destY + 1) * RouteGridWidth + destX + 1] = 0;
                    // hide this part joey from the grid
                }
                else
                    return 1; // AR destination is an unaccessible block
            }

            if (!CalcWalkGrid(startX, startY, destX, destY))
                return 1; // can't find route to block

            var routeData = MakeRouteData(destX, destY);
            // the route is done.
            // if there was an initial x movement (due to clipping) tag it onto the start
            routeData = CheckInitMove(routeData, initStaX);

            byte cnt = 0;
            do
            {
                routeDest[cnt] = routeData[cnt];
                routeDest[cnt + 1] = routeData[cnt + 1];
                cnt += 2;
            } while (routeData[cnt - 2] != 0);
            return 0;
        }