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

        void DrawStripToScreen(VirtScreen vs, int x, int width, int top, int bottom)
        {
            // Short-circuit if nothing has to be drawn
            if (bottom <= top || top >= vs.Height)
                return;

            // Perform some clipping
            if (width > vs.Width - x)
                width = vs.Width - x;
            if (top < ScreenTop)
                top = ScreenTop;
            if (bottom > ScreenTop + ScreenHeight)
                bottom = ScreenTop + ScreenHeight;

            // Convert the vertical coordinates to real screen coords
            int y = vs.TopLine + top - ScreenTop;
            int height = bottom - top;

            if (width <= 0 || height <= 0)
                return;

            byte[] src;
            if (Game.Version < 7)
            {
                if (Game.Platform == Platform.FMTowns)
                {
                    TownsDrawStripToScreen(vs, x, y, x, top, width, height);
                    return;
                }

                var srcNav = new PixelNavigator(vs.Surfaces[0]);
                srcNav.GoTo(vs.XStart + x, top);

                var compNav = new PixelNavigator(_composite);
                var txtNav = new PixelNavigator(_textSurface);
                int m = _textSurfaceMultiplier;
                txtNav.GoTo(x * m, y * m);

                var vsPitch = vs.Pitch - width * vs.BytesPerPixel;
                var textPitch = _textSurface.Pitch - width * m;

                for (int h = height * m; h > 0; --h)
                {
                    for (int w = width * m; w > 0; w--)
                    {
                        var temp = txtNav.Read();
                        int mask = temp ^ CharsetMaskTransparency;
                        mask = (((mask & 0x7f) + 0x7f) | mask) & 0x80;
                        mask = ((mask >> 7) + 0x7f) ^ 0x80;

                        var dst = ((temp ^ srcNav.Read()) & mask) ^ temp;
                        compNav.Write((byte)dst);

                        srcNav.OffsetX(1);
                        txtNav.OffsetX(1);
                        compNav.OffsetX(1);
                    }

                    srcNav.OffsetX(vsPitch);
                    txtNav.OffsetX(textPitch);
                }

                src = _composite.Pixels;
            }
            else
            {
                src = new byte[width * height * vs.BytesPerPixel];
                var srcNav = new PixelNavigator(vs.Surfaces[0]);
                srcNav.GoTo(vs.XStart + x, top);
                for (int h = 0; h < height; h++)
                {
                    for (int w = 0; w < width; w++)
                    {
                        src[h * width + w] = srcNav.Read();
                        srcNav.OffsetX(1);
                    }
                    srcNav.Offset(-width, 1);
                }
            }

            // Finally blit the whole thing to the screen
            _gfxManager.CopyRectToScreen(src, width * vs.BytesPerPixel, x, y, width, height);
        }