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

        protected void RestoreBackground(Rect rect, byte backColor = 0)
        {
            VirtScreen vs;

            if (rect.Top < 0)
                rect.Top = 0;
            if (rect.Left >= rect.Right || rect.Top >= rect.Bottom)
                return;

            if ((vs = FindVirtScreen(rect.Top)) == null)
                return;

            if (rect.Left > vs.Width)
                return;

            // Convert 'rect' to local (virtual screen) coordinates
            rect.Top -= vs.TopLine;
            rect.Bottom -= vs.TopLine;

            rect.Clip(vs.Width, vs.Height);

            int height = rect.Height;
            int width = rect.Width;

            if (_game.Platform == Platform.FMTowns && Game.GameId == GameId.Monkey1 && vs == VerbVirtScreen && rect.Bottom <= 154)
                rect.Right = 319;

            MarkRectAsDirty(vs, rect.Left, rect.Right, rect.Top, rect.Bottom, Gdi.UsageBitRestored);

            var screenBuf = new PixelNavigator(vs.Surfaces[0]);
            screenBuf.GoTo(vs.XStart + rect.Left, rect.Top);

            if (height == 0)
                return;

            if (vs.HasTwoBuffers && _currentRoom != 0 && IsLightOn())
            {
                var back = new PixelNavigator(vs.Surfaces[1]);
                back.GoTo(vs.XStart + rect.Left, rect.Top);
                Gdi.Blit(screenBuf, back, width, height);
                if (vs == MainVirtScreen && _charset.HasMask)
                {
                    if (_game.Platform == Platform.FMTowns)
                    {
                        var mask = new PixelNavigator(_textSurface);
                        mask.GoTo(rect.Left * _textSurfaceMultiplier, (rect.Top + vs.TopLine) * _textSurfaceMultiplier);
                        Gdi.Fill(mask, 0, width * _textSurfaceMultiplier, height * _textSurfaceMultiplier);
                    }
                    else
                    {
                        var mask = new PixelNavigator(_textSurface);
                        mask.GoTo(rect.Left, rect.Top - ScreenTop);
                        Gdi.Fill(mask, CharsetMaskTransparency, width * _textSurfaceMultiplier, height * _textSurfaceMultiplier);
                    }
                }
            }
            else
            {
                if (Game.Platform == Platform.FMTowns)
                {
                    backColor |= (byte)(backColor << 4);
                    var mask = new PixelNavigator(_textSurface);
                    mask.GoTo(rect.Left * _textSurfaceMultiplier, (rect.Top + vs.TopLine) * _textSurfaceMultiplier);
                    Gdi.Fill(mask, backColor, width * _textSurfaceMultiplier, height * _textSurfaceMultiplier);
                }

                if (Game.Features.HasFlag(GameFeatures.Is16BitColor))
                    Gdi.Fill(screenBuf, _16BitPalette[backColor], width, height);
                else
                    Gdi.Fill(screenBuf, backColor, width, height);
            }
        }