NScumm.Scumm.ScummEngine.SetShadowPalette C# (CSharp) Метод

        protected void SetShadowPalette(int redScale, int greenScale, int blueScale, int startColor, int endColor, int start, int end)
        {
            var currentPalette = roomData.Palettes[_curPalIndex];

            // This is an implementation based on the original games code.
            //
            // The four known rooms where setShadowPalette is used in atlantis are:
            //
            // 1) FOA Room 53: subway departing Knossos for Atlantis.
            // 2) FOA Room 48: subway crashing into the Atlantis entrance area
            // 3) FOA Room 82: boat/sub shadows while diving near Thera
            // 4) FOA Room 23: the big machine room inside Atlantis
            //
            // There seems to be no explanation for why this function is called
            // from within Room 23 (the big machine), as it has no shadow effects
            // and thus doesn't result in any visual differences.

            if (Game.GameId == Scumm.IO.GameId.SamNMax)
            {
                for (var i = 0; i < 256; i++)
                    _shadowPalette[i] = (byte)i;
            }

            for (var i = start; i < end; i++)
            {
                var r = ((currentPalette.Colors[i].R >> 2) * redScale) >> 8;
                var g = ((currentPalette.Colors[i].G >> 2) * greenScale) >> 8;
                var b = ((currentPalette.Colors[i].B >> 2) * blueScale) >> 8;

                var bestitem = 0;
                uint bestsum = 32000;

                for (var j = startColor; j <= endColor; j++)
                {
                    int ar = currentPalette.Colors[j].R >> 2;
                    int ag = currentPalette.Colors[j].G >> 2;
                    int ab = currentPalette.Colors[j].B >> 2;

                    uint sum = (uint)(Math.Abs(ar - r) + Math.Abs(ag - g) + Math.Abs(ab - b));

                    if (sum < bestsum)
                    {
                        bestsum = sum;
                        bestitem = j;
                    }
                }
                _shadowPalette[i] = (byte)bestitem;
            }
        }