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

        void RestoreCharsetBg()
        {
            _nextLeft = _string[0].Position.X;
            _nextTop = _string[0].Position.Y + ScreenTop;

            if (_charset.HasMask)
            {
                _charset.HasMask = false;
                _charset.Str.Left = -1;
                _charset.Left = -1;

                // Restore background on the whole text area. This code is based on
                // restoreBackground(), but was changed to only restore those parts which are
                // currently covered by the charset mask.

                var vs = _charset.TextScreen;
                if (vs.Height == 0)
                    return;

                MarkRectAsDirty(vs, 0, vs.Width, 0, vs.Height, Gdi.UsageBitRestored);

                if (vs.HasTwoBuffers && _currentRoom != 0 && IsLightOn())
                {
                    if (vs != MainVirtScreen)
                    {
                        // Restore from back buffer
                        var screenBufNav = new PixelNavigator(vs.Surfaces[0]);
                        screenBufNav.OffsetX(vs.XStart);
                        var backNav = new PixelNavigator(vs.Surfaces[1]);
                        backNav.OffsetX(vs.XStart);
                        Gdi.Blit(screenBufNav, backNav, vs.Width, vs.Height);
                    }
                }
                else
                {
                    // Clear area
                    var screenBuf = vs.Surfaces[0].Pixels;
                    Array.Clear(screenBuf, 0, screenBuf.Length);
                }

                if (vs.HasTwoBuffers)
                {
                    // Clean out the charset mask
                    ClearTextSurface();
                }
            }
        }
    }