void wxMemoryDCImpl::DoSelect( const wxBitmap& bitmap )
{
    m_bitmap = bitmap;

    if (m_gc)
        XFreeGC((Display*) m_display, (GC) m_gc);
    m_gc = (WXGC) NULL;

    if (m_bitmap.Ok() && (bitmap.GetDisplay() == m_display))
    {
        m_pixmap = m_bitmap.GetDrawable();
        Display* display = (Display*) m_display;

        XGCValues gcvalues;
        gcvalues.foreground = BlackPixel (display, DefaultScreen (display));
        gcvalues.background = WhitePixel (display, DefaultScreen (display));
        gcvalues.graphics_exposures = False;
        gcvalues.subwindow_mode = IncludeInferiors;
        gcvalues.line_width = 1;
        m_gc = (WXGC) XCreateGC (display, (Drawable)m_pixmap/* RootWindow (display, DefaultScreen (display)) */,
            GCForeground | GCBackground | GCGraphicsExposures | GCLineWidth | GCSubwindowMode,
            &gcvalues);

        m_backgroundPixel = gcvalues.background;
        m_ok = true;

        SetBrush (* wxWHITE_BRUSH);
        SetPen (* wxBLACK_PEN);
    }
    else
    {
        m_ok = false;
        m_pixmap = (WXPixmap) 0;
    };
}