Bochs/bochs/gui/x.cc

/////////////////////////////////////////////////////////////////////////
// $Id: x.cc,v 1.109 2008-01-26 00:00:30 vruppert Exp $
/////////////////////////////////////////////////////////////////////////
//
//  Copyright (C) 2002  MandrakeSoft S.A.
//
//    MandrakeSoft S.A.
//    43, rue d'Aboukir
//    75002 Paris - France
//    http://www.linux-mandrake.com/
//    http://www.mandrakesoft.com/
//
//  This library is free software; you can redistribute it and/or
//  modify it under the terms of the GNU Lesser General Public
//  License as published by the Free Software Foundation; either
//  version 2 of the License, or (at your option) any later version.
//
//  This library is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
//  Lesser General Public License for more details.
//
//  You should have received a copy of the GNU Lesser General Public
//  License along with this library; if not, write to the Free Software
//  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA

#define XK_PUBLISHING
#define XK_TECHNICAL

// Define BX_PLUGGABLE in files that can be compiled into plugins.  For
// platforms that require a special tag on exported symbols, BX_PLUGGABLE 
// is used to know when we are exporting symbols and when we are importing.
#define BX_PLUGGABLE

#include "bochs.h"
#include "iodev.h"
#if BX_WITH_X11

extern "C" {
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/Xos.h>
#include <X11/Xatom.h>
#include <X11/keysym.h>
#if BX_HAVE_XPM_H
#include <X11/xpm.h>
#endif
}

#if BX_HAVE_XPM_H
#include "icon_bochs.xpm"
#else
#include "icon_bochs.h"
#endif

#include "font/vga.bitmap.h"

class bx_x_gui_c : public bx_gui_c {
public:
  bx_x_gui_c (void);
  DECLARE_GUI_VIRTUAL_METHODS()
  DECLARE_GUI_NEW_VIRTUAL_METHODS()
#if BX_USE_IDLE_HACK
  virtual void sim_is_idle(void);
#endif
  virtual void beep_on(float frequency);
  virtual void beep_off();
  virtual void statusbar_setitem(int element, bx_bool active);
  virtual void get_capabilities(Bit16u *xres, Bit16u *yres, Bit16u *bpp);
#if BX_SHOW_IPS
  virtual void show_ips(Bit32u ips_count);
#endif
};

// declare one instance of the gui object and call macro to insert the
// plugin code
static bx_x_gui_c *theGui = NULL;
IMPLEMENT_GUI_PLUGIN_CODE(x)

#define LOG_THIS theGui->

#define MAX_MAPPED_STRING_LENGTH 10

/* These are used as arguments to nearly every Xlib routine, so it saves
 * routine arguments to declare them global.  If there were
 * additional source files, they would be declared extern there. */
Display *bx_x_display;
int bx_x_screen_num;
static Visual *default_visual;
static Colormap default_cmap;
static unsigned long white_pixel=0, black_pixel=0;

static char *progname; /* name this program was invoked by */

static unsigned int text_rows=25, text_cols=80;
static Bit8u h_panning = 0, v_panning = 0;
static Bit16u line_compare = 1023;

static Window win;
static GC gc, gc_inv, gc_headerbar, gc_headerbar_inv;
static unsigned font_width, font_height;
static unsigned dimension_x=0, dimension_y=0;
static unsigned vga_bpp=8;

static XImage *ximage = NULL;
static unsigned imDepth, imWide, imBPP;

// current cursor coordinates
static int prev_x=-1, prev_y=-1;
static int current_x=-1, current_y=-1, current_z=0;
static unsigned mouse_button_state = 0;
static bx_bool CTRL_pressed = 0;

static unsigned prev_cursor_x=0;
static unsigned prev_cursor_y=0;

static int warp_home_x = 200;
static int warp_home_y = 200;
static int mouse_enable_x = 0;
static int mouse_enable_y = 0;
static int warp_dx = 0;
static int warp_dy = 0;

static void warp_cursor(int dx, int dy);
static void disable_cursor();
static void enable_cursor();

static Bit32u convertStringToXKeysym (const char *string);

static bx_bool x_init_done = false;

static Pixmap vgafont[256];

static struct {
  Pixmap bmap;
  unsigned xdim;
  unsigned ydim;
  } bx_bitmaps[BX_MAX_PIXMAPS];
unsigned bx_bitmap_entries = 0;

static struct {
  Pixmap   bitmap;
  unsigned xdim;
  unsigned ydim;
  unsigned xorigin;
  unsigned yorigin;
  unsigned alignment;
  void (*f)(void);
  } bx_headerbar_entry[BX_MAX_HEADERBAR_ENTRIES];
static unsigned bx_headerbar_y = 0;
static unsigned bx_headerbar_entries = 0;
static unsigned bx_bitmap_left_xorigin = 0;  // pixels from left
static unsigned bx_bitmap_right_xorigin = 0; // pixels from right

static unsigned bx_statusbar_y = 18;
static unsigned bx_statusitem_pos[12] = {
  0, 200, 240, 280, 320, 360, 400, 440, 480, 520, 560, 600
  };
static bx_bool bx_statusitem_active[12];
static long bx_status_led_green, bx_status_graytext;
static char bx_status_info_text[34];
#if BX_SHOW_IPS
static bx_bool x11_ips_update = 0;
static char x11_ips_text[20];
static Bit8u x11_mouse_msg_counter = 0;
#endif

static void headerbar_click(int x, int y);
static void send_keyboard_mouse_status(void);
static void set_status_text(int element, const char *text, bx_bool active);


Bit32u ascii_to_key_event[0x5f] = {
  //  !"#$%&'
  BX_KEY_SPACE,
  BX_KEY_1,
  BX_KEY_SINGLE_QUOTE,
  BX_KEY_3,
  BX_KEY_4,
  BX_KEY_5,
  BX_KEY_7,
  BX_KEY_SINGLE_QUOTE,

  // ()*+,-./
  BX_KEY_9,
  BX_KEY_0,
  BX_KEY_8,
  BX_KEY_EQUALS,
  BX_KEY_COMMA,
  BX_KEY_MINUS,
  BX_KEY_PERIOD,
  BX_KEY_SLASH,

  // 01234567
  BX_KEY_0,
  BX_KEY_1,
  BX_KEY_2,
  BX_KEY_3,
  BX_KEY_4,
  BX_KEY_5,
  BX_KEY_6,
  BX_KEY_7,

  // 89:;<=>?
  BX_KEY_8,
  BX_KEY_9,
  BX_KEY_SEMICOLON,
  BX_KEY_SEMICOLON,
  BX_KEY_COMMA,
  BX_KEY_EQUALS,
  BX_KEY_PERIOD,
  BX_KEY_SLASH,

  // @ABCDEFG
  BX_KEY_2,
  BX_KEY_A,
  BX_KEY_B,
  BX_KEY_C,
  BX_KEY_D,
  BX_KEY_E,
  BX_KEY_F,
  BX_KEY_G,


  // HIJKLMNO
  BX_KEY_H,
  BX_KEY_I,
  BX_KEY_J,
  BX_KEY_K,
  BX_KEY_L,
  BX_KEY_M,
  BX_KEY_N,
  BX_KEY_O,


  // PQRSTUVW
  BX_KEY_P,
  BX_KEY_Q,
  BX_KEY_R,
  BX_KEY_S,
  BX_KEY_T,
  BX_KEY_U,
  BX_KEY_V,
  BX_KEY_W,

  // XYZ[\]^_
  BX_KEY_X,
  BX_KEY_Y,
  BX_KEY_Z,
  BX_KEY_LEFT_BRACKET,
  BX_KEY_BACKSLASH,
  BX_KEY_RIGHT_BRACKET,
  BX_KEY_6,
  BX_KEY_MINUS,

  // `abcdefg
  BX_KEY_GRAVE,
  BX_KEY_A,
  BX_KEY_B,
  BX_KEY_C,
  BX_KEY_D,
  BX_KEY_E,
  BX_KEY_F,
  BX_KEY_G,

  // hijklmno
  BX_KEY_H,
  BX_KEY_I,
  BX_KEY_J,
  BX_KEY_K,
  BX_KEY_L,
  BX_KEY_M,
  BX_KEY_N,
  BX_KEY_O,

  // pqrstuvw
  BX_KEY_P,
  BX_KEY_Q,
  BX_KEY_R,
  BX_KEY_S,
  BX_KEY_T,
  BX_KEY_U,
  BX_KEY_V,
  BX_KEY_W,

  // xyz{|}~
  BX_KEY_X,
  BX_KEY_Y,
  BX_KEY_Z,
  BX_KEY_LEFT_BRACKET,
  BX_KEY_BACKSLASH,
  BX_KEY_RIGHT_BRACKET,
  BX_KEY_GRAVE
  };

extern Bit8u graphics_snapshot[32 * 1024];


static void create_internal_vga_font(void);
static void xkeypress(KeySym keysym, int press_release);
// extern "C" void select_visual(void);

#define ROUNDUP(nbytes, pad) ((((nbytes) + ((pad)-1)) / (pad)) * ((pad)>>3))


#define MAX_VGA_COLORS 256

unsigned long col_vals[MAX_VGA_COLORS]; // 256 VGA colors
unsigned curr_foreground, curr_background;

static unsigned x_tilesize, y_tilesize;

BxEvent *x11_notify_callback (void *unused, BxEvent *event);
bxevent_handler old_callback = NULL;
void *old_callback_arg = NULL;


// Try to allocate NCOLORS at once in the colormap provided.  If it can
// be done, return true.  If not, return false.  (In either case, free
// up the color cells so that we don't add to the problem!)  This is used
// to determine whether Bochs should use a private colormap even when the
// user did not specify it.
static bx_bool
test_alloc_colors (Colormap cmap, Bit32u n_tries) {
  XColor color;
  unsigned long pixel[MAX_VGA_COLORS];
  bx_bool pixel_valid[MAX_VGA_COLORS];
  Bit32u n_allocated = 0;
  Bit32u i;
  color.flags = DoRed | DoGreen | DoBlue;
  for (i=0; i<n_tries; i++) {
    // choose wierd color values that are unlikely to already be in the 
    // colormap.
    color.red   = ((i+41)%MAX_VGA_COLORS) << 8;
    color.green = ((i+42)%MAX_VGA_COLORS) << 8;
    color.blue  = ((i+43)%MAX_VGA_COLORS) << 8;
    pixel_valid[i] = false;
    if (XAllocColor (bx_x_display, cmap, &color)) {
      pixel[i] = color.pixel;
      pixel_valid[i] = true;
      n_allocated++;
    }
  }
  BX_INFO (("test_alloc_colors: %d colors available out of %d colors tried", n_allocated, n_tries));
  // now free them all
  for (i=0; i<n_tries; i++) {
    if (pixel_valid[i]) XFreeColors (bx_x_display, cmap, &pixel[i], 1, 0);
  }
  return (n_allocated == n_tries);
}

bx_x_gui_c::bx_x_gui_c () {
}

  void
bx_x_gui_c::specific_init(int argc, char **argv, unsigned tilewidth, unsigned tileheight,
                     unsigned headerbar_y)
{
  unsigned i;
  int x, y;   /* window position */
  unsigned int border_width = 4;  /* four pixels */
  const char *window_name = BOCHS_WINDOW_NAME;
  const char *icon_name = "Bochs";
  Pixmap icon_pixmap;
#if BX_HAVE_XPM_H
  Pixmap icon_mask;
#endif
  XSizeHints size_hints;
  char *display_name = NULL;
  /* create GC for text and drawing */
  unsigned long valuemask = 0; /* ignore XGCvalues and use defaults */
  XGCValues values;
  int      default_depth;
  XEvent report;
  XSetWindowAttributes win_attr;
  unsigned long plane_masks_return[1];
  XColor color;

  put("XGUI");

  x_tilesize = tilewidth;
  y_tilesize = tileheight;
  bx_headerbar_y = headerbar_y;

  progname = argv[0];

  /* connect to X server */
  if ( (bx_x_display=XOpenDisplay(display_name)) == NULL )
  {
    BX_PANIC(("%s: cannot connect to X server %s",
        progname, XDisplayName(display_name)));
  }

  /* get screen size from display structure macro */
  bx_x_screen_num = DefaultScreen(bx_x_display);

  /* Note that in a real application, x and y would default to 0
   * but would be settable from the command line or resource database.
   */
  x = y = 0;


  // Temporary values so we can create the window
  font_width = 8;
  font_height = 16;

  dimension_x = text_cols * font_width;
  dimension_y = text_rows * font_height;

  /* create opaque window */
  win = XCreateSimpleWindow(bx_x_display, RootWindow(bx_x_display,bx_x_screen_num),
    x, y,
    dimension_x,
    dimension_y + bx_headerbar_y + bx_statusbar_y,
    border_width,
    BlackPixel(bx_x_display, bx_x_screen_num),
    BlackPixel(bx_x_display, bx_x_screen_num));

  // (attempt to) enable backing store
  win_attr.save_under=1;
  win_attr.backing_store=Always;
  XChangeWindowAttributes(bx_x_display,win,CWSaveUnder|CWBackingStore,&win_attr);

  default_depth  = DefaultDepth(bx_x_display, bx_x_screen_num);
  default_visual = DefaultVisual(bx_x_display, bx_x_screen_num);

  if (!SIM->get_param_bool(BXPN_PRIVATE_COLORMAP)->get()) {
    default_cmap = DefaultColormap(bx_x_display, bx_x_screen_num);
    // try to use default colormap.  If not enough colors are available,
    // then switch to private colormap despite the user setting.  There
    // are too many cases when no colors are available and Bochs simply
    // draws everything in black on black.
    if (!test_alloc_colors (default_cmap, 16)) {
      BX_ERROR (("I can't even allocate 16 colors!  Switching to a private colormap"));
      SIM->get_param_bool(BXPN_PRIVATE_COLORMAP)->set(1);
    }
    col_vals[0]  = BlackPixel(bx_x_display, bx_x_screen_num);
    col_vals[15] = WhitePixel(bx_x_display, bx_x_screen_num);
    for (i = 1; i < MAX_VGA_COLORS; i++) {
      if (i==15) continue;
      col_vals[i] = col_vals[0];
    }
  }

  if (SIM->get_param_bool(BXPN_PRIVATE_COLORMAP)->get()) {
    default_cmap = XCreateColormap(bx_x_display, DefaultRootWindow(bx_x_display),
                                   default_visual, AllocNone);
    if (XAllocColorCells(bx_x_display, default_cmap, False,
                         plane_masks_return, 0, col_vals, MAX_VGA_COLORS) == 0) {
      BX_PANIC(("XAllocColorCells returns error. Maybe your screen does not support a private colormap?"));
      }

    win_attr.colormap = default_cmap;
    XChangeWindowAttributes(bx_x_display, win, CWColormap, &win_attr);

    color.flags = DoRed | DoGreen | DoBlue;

    for (i=0; i < MAX_VGA_COLORS; i++) {
      color.pixel = i;
      if (i==15) {
        color.red   = 0xffff;
        color.green = 0xffff;
        color.blue  = 0xffff;
        }
      else {
        color.red   = 0;
        color.green = 0;
        color.blue  = 0;
        }
      XStoreColor(bx_x_display, default_cmap, &color);
      }
    }

  // convenience variables which hold the black & white color indeces
  black_pixel = col_vals[0];
  white_pixel = col_vals[15];

  BX_INFO(("font %u wide x %u high, display depth = %d",
		(unsigned) font_width, (unsigned) font_height, default_depth));

  //select_visual();


  /* Get available icon sizes from Window manager */

#if BX_HAVE_XPM_H
  /* Create pixmap from XPM for icon */
  XCreatePixmapFromData(bx_x_display, win, icon_bochs_xpm, &icon_pixmap, &icon_mask, NULL);
#else
  /* Create pixmap of depth 1 (bitmap) for icon */
  icon_pixmap = XCreateBitmapFromData(bx_x_display, win,
    (char *) bochs_icon_bits, bochs_icon_width, bochs_icon_height);
#endif

  /* Set size hints for window manager.  The window manager may
   * override these settings.  Note that in a real
   * application if size or position were set by the user
   * the flags would be UPosition and USize, and these would
   * override the window manager's preferences for this window. */
  /* x, y, width, and height hints are now taken from
   * the actual settings of the window when mapped. Note
   * that PPosition and PSize must be specified anyway. */

  size_hints.flags = PPosition | PSize | PMinSize | PMaxSize;
  size_hints.max_width = size_hints.min_width = dimension_x;
  size_hints.max_height = size_hints.min_height = dimension_y + bx_headerbar_y +
                          bx_statusbar_y;

  {
  XWMHints wm_hints;
  XClassHint class_hints;

  /* format of the window name and icon name
   * arguments has changed in R4 */
  XTextProperty windowName, iconName;

  /* These calls store window_name and icon_name into
   * XTextProperty structures and set their other
   * fields properly. */
  if (XStringListToTextProperty((char **)&window_name, 1, &windowName) == 0) {
    BX_PANIC(("%s: structure allocation for windowName failed.",
        progname));
  }

  if (XStringListToTextProperty((char **)&icon_name, 1, &iconName) == 0) {
    BX_PANIC(("%s: structure allocation for iconName failed.",
        progname));
  }

  wm_hints.initial_state = NormalState;
  wm_hints.input = True;
  wm_hints.icon_pixmap = icon_pixmap;
#if BX_HAVE_XPM_H
  wm_hints.icon_mask = icon_mask;
  wm_hints.flags = StateHint | IconPixmapHint | IconMaskHint | InputHint;
#else
  wm_hints.flags = StateHint | IconPixmapHint | InputHint;
#endif
  class_hints.res_name = progname;
  class_hints.res_class = (char *)"Bochs";

  XSetWMProperties(bx_x_display, win, &windowName, &iconName,
      argv, argc, &size_hints, &wm_hints,
      &class_hints);
  XFree(windowName.value);
  XFree(iconName.value);
  Atom wm_delete = XInternAtom(bx_x_display, "WM_DELETE_WINDOW", 1);
  XSetWMProtocols(bx_x_display, win, &wm_delete, 1);
  }

  /* Select event types wanted */
  XSelectInput(bx_x_display, win, ExposureMask | KeyPressMask | KeyReleaseMask |
      ButtonPressMask | ButtonReleaseMask | StructureNotifyMask | PointerMotionMask |
      EnterWindowMask | LeaveWindowMask );


  /* Create default Graphics Context */
  gc               = XCreateGC(bx_x_display, win, valuemask, &values);
  gc_inv           = XCreateGC(bx_x_display, win, valuemask, &values);
  gc_headerbar     = XCreateGC(bx_x_display, win, valuemask, &values);
  gc_headerbar_inv = XCreateGC(bx_x_display, win, valuemask, &values);

  XSetState(bx_x_display, gc, white_pixel, black_pixel, GXcopy,AllPlanes);

  XSetState(bx_x_display, gc_inv, black_pixel, white_pixel, GXinvert,AllPlanes);

  XSetState(bx_x_display, gc_headerbar, black_pixel, white_pixel, GXcopy,AllPlanes);

  XSetState(bx_x_display, gc_headerbar_inv, white_pixel, black_pixel, GXcopy,AllPlanes);


  /* Display window */
  XMapWindow(bx_x_display, win);
  XSync(bx_x_display, /* no discard */ 0);

  BX_DEBUG(("waiting for MapNotify"));
  while (1) {
    XNextEvent(bx_x_display, &report);
    if (report.type == MapNotify) break;
    }
  BX_DEBUG(("MapNotify found."));

  // Create the VGA font
  create_internal_vga_font();


{
  char *imagedata;

  ximage = XCreateImage(bx_x_display, default_visual,
             default_depth,          // depth of image (bitplanes)
             ZPixmap,
             0,                      // offset
             NULL,                   // malloc() space after
             x_tilesize, y_tilesize, // x & y size of image
             32,                     // # bits of padding
             0 );                    // bytes_per_line, let X11 calculate
  if (!ximage)
    BX_PANIC(("vga: couldn't XCreateImage()"));

  imDepth = default_depth;
  imWide  = ximage->bytes_per_line;
  imBPP   = ximage->bits_per_pixel;

  imagedata = (char *) malloc( (size_t) (ximage->bytes_per_line * y_tilesize) );
  if (!imagedata) BX_PANIC(("imagedata: malloc returned error"));

  ximage->data = imagedata;

  if (imBPP < imDepth) {
    BX_PANIC(("vga_x: bits_per_pixel < depth ?"));
    }

  for (i=0; i<12; i++) bx_statusitem_active[i] = 0;
  switch (imBPP) {
    case 16:
      bx_status_led_green = 0x07e0;
      bx_status_graytext = 0x8410;
      break;
    case 24:
    case 32:
      bx_status_led_green = 0x00ff00;
      bx_status_graytext = 0x808080;
      break;
    default:
      bx_status_led_green = 0;
      bx_status_graytext = 0;
  }
  strcpy(bx_status_info_text, "CTRL + 3rd button enables mouse");

  x_init_done = true;
}

  curr_background = 0;
  XSetBackground(bx_x_display, gc, col_vals[curr_background]);
  curr_foreground = 1;
  XSetForeground(bx_x_display, gc, col_vals[curr_foreground]);
  //XGrabPointer( bx_x_display, win, True, 0, GrabModeAsync, GrabModeAsync,
  //  win, None, CurrentTime );


  XFlush(bx_x_display);

  // redirect notify callback to X11 specific code
  SIM->get_notify_callback (&old_callback, &old_callback_arg);
  assert (old_callback != NULL);
  SIM->set_notify_callback (x11_notify_callback, NULL);

  // loads keymap for x11
  if (SIM->get_param_bool(BXPN_KBD_USEMAPPING)->get()) {
    bx_keymap.loadKeymap(convertStringToXKeysym);
  }

  new_gfx_api = 1;
  dialog_caps |= BX_GUI_DLG_USER;
}

  void
set_status_text(int element, const char *text, bx_bool active)
{
  int xleft, xsize, sb_ypos;

  xleft = bx_statusitem_pos[element] + 2;
  xsize = bx_statusitem_pos[element+1] - xleft;
  sb_ypos = dimension_y + bx_headerbar_y;
  if (element < 1) {
    if (strcmp(bx_status_info_text, text)) {
      strcpy(bx_status_info_text, text);
    }
    XFillRectangle(bx_x_display, win, gc_headerbar_inv, xleft, sb_ypos+2, xsize,
                   bx_statusbar_y-2);
    XDrawString(bx_x_display, win, gc_headerbar, xleft, sb_ypos+bx_statusbar_y-2,
                text, strlen(text));
  } else if (element <= BX_MAX_STATUSITEMS) {
    bx_statusitem_active[element] = active;
    if (active) {
      XSetForeground(bx_x_display, gc_headerbar, bx_status_led_green);
      XFillRectangle(bx_x_display, win, gc_headerbar, xleft, sb_ypos+2, xsize-1, bx_statusbar_y-2);
      XSetForeground(bx_x_display, gc_headerbar, black_pixel);
    } else {
      XFillRectangle(bx_x_display, win, gc_headerbar_inv, xleft, sb_ypos+2, xsize-1, bx_statusbar_y-2);
      XSetForeground(bx_x_display, gc_headerbar, bx_status_graytext);
    }
    XDrawString(bx_x_display, win, gc_headerbar, xleft, sb_ypos+bx_statusbar_y-2,
                text, strlen(text));
    XSetForeground(bx_x_display, gc_headerbar, black_pixel);
  }
}

  void 
bx_x_gui_c::statusbar_setitem(int element, bx_bool active)
{
  if (element < 0) {
    for (unsigned i = 0; i < statusitem_count; i++) {
      set_status_text(i+1, statusitem_text[i], active);
    }
  } else if ((unsigned)element < statusitem_count) {
    set_status_text(element+1, statusitem_text[element], active);
  }
}

// This is called whenever the mouse_enabled parameter changes.  It
// can change because of a gui event such as clicking on the mouse-enable
// bitmap or pressing the middle button, or from the configuration interface.
// In all those cases, setting the parameter value will get you here.
  void
bx_x_gui_c::mouse_enabled_changed_specific (bx_bool val)
{
  BX_DEBUG (("mouse_enabled=%d, x11 specific code", val?1:0));
  if (val) {
    BX_INFO(("[x] Mouse on"));
    set_status_text(0, "CTRL + 3rd button disables mouse", 0);
    mouse_enable_x = current_x;
    mouse_enable_y = current_y;
    disable_cursor();
    // Move the cursor to a 'safe' place
    warp_cursor(warp_home_x-current_x, warp_home_y-current_y);
  } else {
    BX_INFO(("[x] Mouse off"));
    set_status_text(0, "CTRL + 3rd button enables mouse", 0);
    enable_cursor();
    warp_cursor(mouse_enable_x-current_x, mouse_enable_y-current_y);
  }
#if BX_SHOW_IPS
  x11_mouse_msg_counter = 3;
#endif
}

  void
create_internal_vga_font(void)
{
  // Default values
  font_width=8;
  font_height=16;

  for(int i=0; i<256; i++) {
    vgafont[i]=XCreateBitmapFromData(bx_x_display, win, (const char*)bx_vgafont[i].data,
                                     font_width, font_height);
    if(vgafont[i] == None)
      BX_PANIC(("Can't create vga font [%d]", i));
  }
}

  void
bx_x_gui_c::handle_events(void)
{
  XEvent report;
  XKeyEvent *key_event;
  KeySym keysym;
  XComposeStatus compose;
  char buffer[MAX_MAPPED_STRING_LENGTH];
  int bufsize = MAX_MAPPED_STRING_LENGTH;
  int charcount;
  bx_bool mouse_update;
  int y, height;


  XPointerMovedEvent *pointer_event;
  XEnterWindowEvent *enter_event;
  XLeaveWindowEvent *leave_event;
  XButtonEvent *button_event;
  XExposeEvent *expose_event;


  //current_x = -1;
  //current_y = -1;
  mouse_update = 0;

  while (XPending(bx_x_display) > 0)  {
    XNextEvent(bx_x_display, &report);
    current_z = 0;
    switch  (report.type) {

    case Expose:
      expose_event = &report.xexpose;
      /* Adjust y, and reduce height if it overlaps headerbar. */
      y = expose_event->y - BX_HEADER_BAR_Y;
      height = expose_event->height;
      if (y < 0) {
	height += y;
	y = 0;
      }

      DEV_vga_redraw_area(
        (unsigned) expose_event->x,
        y,
        (unsigned) expose_event->width,
        height);

      /* Always draw headerbar, even if not touched by expose event.
       * As a small optimization, only do it on last contigous expose.
       */
      if (expose_event->count == 0) {
      show_headerbar();
      }
      break;

    case ConfigureNotify:
      BX_DEBUG(("ConfigureNotify Xevent"));
      /* FIXME: It's not clear why we have to show the headerbar here.
       * This should be forced by the following expose events.
       */
      show_headerbar();
      break;

    case ButtonPress:
      button_event = (XButtonEvent *) &report;
		BX_DEBUG(("xxx: buttonpress"));
      if (button_event->y < BX_HEADER_BAR_Y) {
		BX_DEBUG(("xxx:   in headerbar"));
        if (mouse_update) {
		  BX_DEBUG(("xxx:   mouse_update=1"));
          send_keyboard_mouse_status();
          mouse_update = 0;
          }
        prev_x = current_x = -1;
        prev_y = current_y = -1;
        headerbar_click(button_event->x, button_event->y);
        break;
        }
      current_x = button_event->x;
      current_y = button_event->y;
      mouse_update = 1;
	  BX_DEBUG(("xxx:   x,y=(%d,%d)", current_x, current_y));
      switch (button_event->button) {
        case Button1:
          mouse_button_state |= 0x01;
          send_keyboard_mouse_status();
          mouse_update = 0;
          break;
        case Button2:
	  if (CTRL_pressed) {
            toggle_mouse_enable();
          } else {
            mouse_button_state |= 0x04;
            send_keyboard_mouse_status();
            mouse_update = 0;
          }
          break;
        case Button3:
          mouse_button_state |= 0x02;
          send_keyboard_mouse_status();
          mouse_update = 0;
          break;
        }
      break;

    case ButtonRelease:
      button_event = (XButtonEvent *) &report;
      if (button_event->y < BX_HEADER_BAR_Y) {
        if (mouse_update) {
          send_keyboard_mouse_status();
          mouse_update = 0;
          }
        prev_x = current_x = -1;
        prev_y = current_y = -1;
        // ignore, in headerbar area
        break;
        }
      current_x = button_event->x;
      current_y = button_event->y;
      mouse_update = 1;
      switch (button_event->button) {
        case Button1:
          mouse_button_state &= ~0x01;
          send_keyboard_mouse_status();
          mouse_update = 0;
          break;
        case Button2:
          mouse_button_state &= ~0x04;
          send_keyboard_mouse_status();
          mouse_update = 0;
          break;
        case Button3:
          mouse_button_state &= ~0x02;
          send_keyboard_mouse_status();
          mouse_update = 0;
          break;
        case Button4:
          current_z = 1;
          send_keyboard_mouse_status();
          mouse_update = 0;
          break;
        case Button5:
          current_z = -1;
          send_keyboard_mouse_status();
          mouse_update = 0;
          break;
        }
      break;

    case KeyPress:
      key_event = (XKeyEvent *) &report;
      charcount = XLookupString(key_event, buffer, bufsize, &keysym, &compose);
      xkeypress(keysym, 0);
      break;

    case KeyRelease:
      key_event = (XKeyEvent *) &report;
      charcount = XLookupString(key_event, buffer, bufsize, &keysym, &compose);
      xkeypress(keysym, 1);
      break;

    case MotionNotify:
      pointer_event = (XPointerMovedEvent *) &report;
      current_x = pointer_event->x;
      current_y = pointer_event->y;
      mouse_update = 1;
      break;

    case EnterNotify:
      enter_event = (XEnterWindowEvent *) &report;
      prev_x = current_x = enter_event->x;
      prev_y = current_y = enter_event->y;
      break;

    case LeaveNotify:
      leave_event = (XLeaveWindowEvent *) &report;
      prev_x = current_x = -1;
      prev_y = current_y = -1;
      break;

    case MapNotify:
      /* screen needs redraw, since X would have tossed previous
       * requests before window mapped
       */
      //retval = 1;
      break;

    case ClientMessage:
      if (!strcmp(XGetAtomName(bx_x_display, report.xclient.message_type), "WM_PROTOCOLS")) {
        bx_stop_simulation();
      }
      break;

    default:
      // (mch) Ignore...
      BX_DEBUG(("XXX: default Xevent type"));
      /* all events selected by StructureNotifyMask are thrown away here,
       * since nothing is done with them */
      break;
    } /* end switch */
  } /* end while */

  if (mouse_update) {
    BX_DEBUG(("handle_events(): send mouse status"));
    send_keyboard_mouse_status();
  }
#if BX_SHOW_IPS
  if (x11_ips_update) {
    x11_ips_update = 0;
    set_status_text(0, x11_ips_text, 1);
  }
#endif
}


  void
send_keyboard_mouse_status(void)
{
	BX_DEBUG(("XXX: prev=(%d,%d) curr=(%d,%d)",
			prev_x, prev_y, current_x, current_y));

  if (((prev_x!=-1) && (current_x!=-1) && (prev_y!=-1) && (current_y!=-1)) ||
     (current_z != 0)) {
    int dx, dy, dz;

    // (mch) consider warping here
    dx = current_x - prev_x - warp_dx;
    dy = -(current_y - prev_y - warp_dy);
    dz = current_z;
    warp_cursor(warp_home_x-current_x, warp_home_y-current_y);

    DEV_mouse_motion_ext (dx, dy, dz, mouse_button_state);
    //if (warped) {
    //  prev_x = current_x = -1;
    //  prev_y = current_y = -1;
    //  }
    //else {
      prev_x = current_x;
      prev_y = current_y;
    //  }
    }
  else {
    if ( (current_x!=-1) && (current_y!=-1)) {
      prev_x = current_x;
      prev_y = current_y;
      }
    else {
      prev_x = current_x = -1;
      prev_y = current_y = -1;
      }
    }
}

  void
bx_x_gui_c::flush(void)
{
  if (bx_x_display)
    XFlush(bx_x_display);
}


  void
xkeypress(KeySym keysym, int press_release)
{
  Bit32u key_event;


  if ((keysym == XK_Control_L) || (keysym == XK_Control_R)) {
    CTRL_pressed = !press_release;
  }

  /* Old (no mapping) behavior */
  if (!SIM->get_param_bool(BXPN_KBD_USEMAPPING)->get()) {

    // this depends on the fact that the X11 keysyms which
    // correspond to the ascii characters space .. tilde
    // are in consequtive order.
    if ((keysym >= XK_space) && (keysym <= XK_asciitilde)) {
      key_event = ascii_to_key_event[keysym - XK_space];
      }
    else switch (keysym) {
      case XK_KP_1:
#ifdef XK_KP_End
      case XK_KP_End:
#endif
        key_event = BX_KEY_KP_END; break;

      case XK_KP_2:
#ifdef XK_KP_Down
      case XK_KP_Down:
#endif
        key_event = BX_KEY_KP_DOWN; break;

      case XK_KP_3:
#ifdef XK_KP_Page_Down
      case XK_KP_Page_Down:
#endif
        key_event = BX_KEY_KP_PAGE_DOWN; break;

      case XK_KP_4:
#ifdef XK_KP_Left
      case XK_KP_Left:
#endif
        key_event = BX_KEY_KP_LEFT; break;

      case XK_KP_5:
#ifdef XK_KP_Begin
      case XK_KP_Begin:
#endif
        key_event = BX_KEY_KP_5; break;

      case XK_KP_6:
#ifdef XK_KP_Right
      case XK_KP_Right:
#endif
        key_event = BX_KEY_KP_RIGHT; break;

      case XK_KP_7:
#ifdef XK_KP_Home
      case XK_KP_Home:
#endif
        key_event = BX_KEY_KP_HOME; break;

      case XK_KP_8:
#ifdef XK_KP_Up
      case XK_KP_Up:
#endif
        key_event = BX_KEY_KP_UP; break;

      case XK_KP_9:
#ifdef XK_KP_Page_Up
      case XK_KP_Page_Up:
#endif
        key_event = BX_KEY_KP_PAGE_UP; break;

      case XK_KP_0:
#ifdef XK_KP_Insert
      case XK_KP_Insert:
#endif
        key_event = BX_KEY_KP_INSERT; break;

      case XK_KP_Decimal:
#ifdef XK_KP_Delete
      case XK_KP_Delete:
#endif
        key_event = BX_KEY_KP_DELETE; break;

#ifdef XK_KP_Enter
      case XK_KP_Enter:    key_event = BX_KEY_KP_ENTER; break;
#endif

      case XK_KP_Subtract: key_event = BX_KEY_KP_SUBTRACT; break;
      case XK_KP_Add:      key_event = BX_KEY_KP_ADD; break;

      case XK_KP_Multiply: key_event = BX_KEY_KP_MULTIPLY; break;
      case XK_KP_Divide:   key_event = BX_KEY_KP_DIVIDE; break;


      case XK_Up:          key_event = BX_KEY_UP; break;
      case XK_Down:        key_event = BX_KEY_DOWN; break;
      case XK_Left:        key_event = BX_KEY_LEFT; break;
      case XK_Right:       key_event = BX_KEY_RIGHT; break;


      case XK_Delete:      key_event = BX_KEY_DELETE; break;
      case XK_BackSpace:   key_event = BX_KEY_BACKSPACE; break;
      case XK_Tab:         key_event = BX_KEY_TAB; break;
#ifdef XK_ISO_Left_Tab
      case XK_ISO_Left_Tab: key_event = BX_KEY_TAB; break;
#endif
      case XK_Return:      key_event = BX_KEY_ENTER; break;
      case XK_Escape:      key_event = BX_KEY_ESC; break;
      case XK_F1:          key_event = BX_KEY_F1; break;
      case XK_F2:          key_event = BX_KEY_F2; break;
      case XK_F3:          key_event = BX_KEY_F3; break;
      case XK_F4:          key_event = BX_KEY_F4; break;
      case XK_F5:          key_event = BX_KEY_F5; break;
      case XK_F6:          key_event = BX_KEY_F6; break;
      case XK_F7:          key_event = BX_KEY_F7; break;
      case XK_F8:          key_event = BX_KEY_F8; break;
      case XK_F9:          key_event = BX_KEY_F9; break;
      case XK_F10:         key_event = BX_KEY_F10; break;
      case XK_F11:         key_event = BX_KEY_F11; break;
      case XK_F12:         key_event = BX_KEY_F12; break;
      case XK_Control_L:   key_event = BX_KEY_CTRL_L; break;
#ifdef XK_Control_R
      case XK_Control_R:   key_event = BX_KEY_CTRL_R; break;
#endif
      case XK_Shift_L:     key_event = BX_KEY_SHIFT_L; break;
      case XK_Shift_R:     key_event = BX_KEY_SHIFT_R; break;
      case XK_Alt_L:       key_event = BX_KEY_ALT_L; break;
#ifdef XK_Alt_R
      case XK_Alt_R:       key_event = BX_KEY_ALT_R; break;
#endif
      case XK_Caps_Lock:   key_event = BX_KEY_CAPS_LOCK; break;
      case XK_Num_Lock:    key_event = BX_KEY_NUM_LOCK; break;
#ifdef XK_Scroll_Lock
      case XK_Scroll_Lock: key_event = BX_KEY_SCRL_LOCK; break;
#endif
#ifdef XK_Print
      case XK_Print:       key_event = BX_KEY_PRINT; break;
#endif
#ifdef XK_Pause
      case XK_Pause:       key_event = BX_KEY_PAUSE; break;
#endif

      case XK_Insert:      key_event = BX_KEY_INSERT; break;
      case XK_Home:        key_event = BX_KEY_HOME; break;
      case XK_End:         key_event = BX_KEY_END; break;
      case XK_Page_Up:     key_event = BX_KEY_PAGE_UP; break;
      case XK_Page_Down:   key_event = BX_KEY_PAGE_DOWN; break;

      default:
        BX_ERROR(( "xkeypress(): keysym %x unhandled!", (unsigned) keysym ));
        return;
      break;
      }
    }
  else {
   /* use mapping */
   BXKeyEntry *entry = bx_keymap.findHostKey (keysym);
   if (!entry) {
     BX_ERROR(( "xkeypress(): keysym %x unhandled!", (unsigned) keysym ));
     return;
   }
   key_event = entry->baseKey;
 }

  if (press_release)
    key_event |= BX_KEY_RELEASED;

  DEV_kbd_gen_scancode(key_event);
}


void bx_x_gui_c::clear_screen(void)
{
  XClearArea(bx_x_display, win, 0, bx_headerbar_y, dimension_x, dimension_y, 0);
}


void bx_x_gui_c::text_update(Bit8u *old_text, Bit8u *new_text,
                      unsigned long cursor_x, unsigned long cursor_y,
                      bx_vga_tminfo_t tm_info)
{
  Bit8u *old_line, *new_line, *text_base;
  Bit8u cChar;
  unsigned int curs, hchars, i, j, offset, rows, x, y, xc, yc, yc2, cs_y;
  unsigned new_foreground, new_background;
  Bit8u cfwidth, cfheight, cfheight2, font_col, font_row, font_row2;
  Bit8u split_textrow, split_fontrows;
  bx_bool forceUpdate = 0, split_screen;
  unsigned char cell[64];
  unsigned long text_palette[16];

  if (charmap_updated) {
    BX_INFO(("charmap update. Font Height is %d",font_height));
    for (unsigned c = 0; c<256; c++) {
      if (char_changed[c]) {
        XFreePixmap(bx_x_display, vgafont[c]);
        bx_bool gfxchar = tm_info.line_graphics && ((c & 0xE0) == 0xC0);
        j = 0;
        memset(cell, 0, sizeof(cell));
        for(i=0; i<font_height*2; i+=2) {
          cell[i] |= ((vga_charmap[(c<<5)+j] & 0x01)<<7);
          cell[i] |= ((vga_charmap[(c<<5)+j] & 0x02)<<5);
          cell[i] |= ((vga_charmap[(c<<5)+j] & 0x04)<<3);
          cell[i] |= ((vga_charmap[(c<<5)+j] & 0x08)<<1);
          cell[i] |= ((vga_charmap[(c<<5)+j] & 0x10)>>1);
          cell[i] |= ((vga_charmap[(c<<5)+j] & 0x20)>>3);
          cell[i] |= ((vga_charmap[(c<<5)+j] & 0x40)>>5);
          cell[i] |= ((vga_charmap[(c<<5)+j] & 0x80)>>7);
          if (gfxchar) {
            cell[i+1] = (vga_charmap[(c<<5)+j] & 0x01);
          }
          j++;
        }

        vgafont[c]=XCreateBitmapFromData(bx_x_display, win, 
                        (const char*)cell, 9, font_height);
            if(vgafont[c] == None)
              BX_PANIC(("Can't create vga font [%d]", c));
        char_changed[c] = 0;
      }
    }
    forceUpdate = 1;
    charmap_updated = 0;
  }
  for (i=0; i<16; i++) {
    text_palette[i] = col_vals[DEV_vga_get_actl_pal_idx(i)];
  }

  if((tm_info.h_panning != h_panning) || (tm_info.v_panning != v_panning)) {
    forceUpdate = 1;
    h_panning = tm_info.h_panning;
    v_panning = tm_info.v_panning;
  }
  if(tm_info.line_compare != line_compare) {
    forceUpdate = 1;
    line_compare = tm_info.line_compare;
  }

  // first invalidate character at previous and new cursor location
  if ( (prev_cursor_y < text_rows) && (prev_cursor_x < text_cols) ) {
    curs = prev_cursor_y * tm_info.line_offset + prev_cursor_x * 2;
    old_text[curs] = ~new_text[curs];
  }
  if((tm_info.cs_start <= tm_info.cs_end) && (tm_info.cs_start < font_height) &&
     (cursor_y < text_rows) && (cursor_x < text_cols)) {
    curs = cursor_y * tm_info.line_offset + cursor_x * 2;
    old_text[curs] = ~new_text[curs];
  } else {
    curs = 0xffff;
  }

  rows = text_rows;
  if (v_panning) rows++;
  y = 0;
  cs_y = 0;
  text_base = new_text - tm_info.start_address;
  split_textrow = (line_compare + v_panning) / font_height;
  split_fontrows = ((line_compare + v_panning) % font_height) + 1;
  split_screen = 0;
  do {
    hchars = text_cols;
    if (h_panning) hchars++;
    if (split_screen) {
      yc = bx_headerbar_y + line_compare + cs_y * font_height + 1;
      font_row = 0;
      if (rows == 1) {
        cfheight = (dimension_y - line_compare - 1) % font_height;
        if (cfheight == 0) cfheight = font_height;
      } else {
        cfheight = font_height;
      }
    } else if (v_panning) {
      if (y == 0) {
        yc = bx_headerbar_y;
        font_row = v_panning;
        cfheight = font_height - v_panning;
      } else {
        yc = y * font_height + bx_headerbar_y - v_panning;
        font_row = 0;
        if (rows == 1) {
          cfheight = v_panning;
        } else {
          cfheight = font_height;
        }
      }
    } else {
      yc = y * font_height + bx_headerbar_y;
      font_row = 0;
      cfheight = font_height;
    }
    if (!split_screen && (y == split_textrow)) {
      if (split_fontrows < cfheight) cfheight = split_fontrows;
    }
    new_line = new_text;
    old_line = old_text;
    x = 0;
    offset = cs_y * tm_info.line_offset;
    do {
      if (h_panning) {
        if (hchars > text_cols) {
          xc = 0;
          font_col = h_panning;
          cfwidth = font_width - h_panning;
        } else {
          xc = x * font_width - h_panning;
          font_col = 0;
          if (hchars == 1) {
            cfwidth = h_panning;
          } else {
            cfwidth = font_width;
          }
        }
      } else {
        xc = x * font_width;
        font_col = 0;
        cfwidth = font_width;
      }
      if ( forceUpdate || (old_text[0] != new_text[0])
          || (old_text[1] != new_text[1]) ) {

        cChar = new_text[0];
        new_foreground = new_text[1] & 0x0f;
        new_background = (new_text[1] & 0xf0) >> 4;

        XSetForeground(bx_x_display, gc, text_palette[new_foreground]);
        XSetBackground(bx_x_display, gc, text_palette[new_background]);

        XCopyPlane(bx_x_display, vgafont[cChar], win, gc, font_col, font_row, cfwidth, cfheight,
                   xc, yc, 1);
        if (offset == curs) {
          XSetForeground(bx_x_display, gc, text_palette[new_background]);
          XSetBackground(bx_x_display, gc, text_palette[new_foreground]);
          if (font_row == 0) {
            yc2 = yc + tm_info.cs_start;
            font_row2 = tm_info.cs_start;
            cfheight2 = tm_info.cs_end - tm_info.cs_start + 1;
            if ((yc2 + cfheight2) > (dimension_y + bx_headerbar_y)) {
              cfheight2 = dimension_y + bx_headerbar_y - yc2;
            }
          } else {
            if (v_panning > tm_info.cs_start) {
              yc2 = yc;
              font_row2 = font_row;
              cfheight2 = tm_info.cs_end - v_panning + 1;
            } else {
              yc2 = yc + tm_info.cs_start - v_panning;
              font_row2 = tm_info.cs_start;
              cfheight2 = tm_info.cs_end - tm_info.cs_start + 1;
            }
          }
          if (yc2 < (dimension_y + bx_headerbar_y)) {
            XCopyPlane(bx_x_display, vgafont[cChar], win, gc, font_col, font_row2, cfwidth,
                       cfheight2, xc, yc2, 1);
          }
        }
      }
      x++;
      new_text+=2;
      old_text+=2;
      offset+=2;
    } while (--hchars);
    if (!split_screen && (y == split_textrow)) {
      new_text = text_base;
      forceUpdate = 1;
      cs_y = 0;
      if (tm_info.split_hpanning) h_panning = 0;
      rows = ((dimension_y - line_compare + font_height - 2) / font_height) + 1;
      split_screen = 1;
    } else {
      y++;
      cs_y++;
      new_text = new_line + tm_info.line_offset;
      old_text = old_line + tm_info.line_offset;
    }
  } while (--rows);

  h_panning = tm_info.h_panning;
  prev_cursor_x = cursor_x;
  prev_cursor_y = cursor_y;

  XFlush(bx_x_display);
}

int bx_x_gui_c::get_clipboard_text(Bit8u **bytes, Bit32s *nbytes)
{
  int len;
  Bit8u *tmp = (Bit8u *)XFetchBytes (bx_x_display, &len);
  // according to man XFetchBytes, tmp must be freed by XFree().  So allocate
  // a new buffer with "new".  The keyboard code will free it with delete []
  // when the paste is done.
  Bit8u *buf = new Bit8u[len];
  memcpy (buf, tmp, len);
  *bytes = buf;
  *nbytes = len;
  XFree (tmp);
  return 1;
}

int bx_x_gui_c::set_clipboard_text(char *text_snapshot, Bit32u len)
{
  // this writes data to the clipboard.
  BX_INFO (("storing %d bytes to X windows clipboard", len));
  XSetSelectionOwner(bx_x_display, XA_PRIMARY, None, CurrentTime);
  XStoreBytes (bx_x_display, (char *)text_snapshot, len);
  return 1;
}


void bx_x_gui_c::graphics_tile_update(Bit8u *tile, unsigned x0, unsigned y0)
{
  unsigned x, y, y_size;
  unsigned color, offset;
  Bit8u b0, b1, b2, b3;

  if ((y0 + y_tilesize) > dimension_y) {
    y_size = dimension_y - y0;
  } else {
    y_size = y_tilesize;
  }
  switch (vga_bpp) {
    case 8:  // 8 bits per pixel
      for (y=0; y<y_size; y++) {
        for (x=0; x<x_tilesize; x++) {
          color = col_vals[tile[y*x_tilesize + x]];
          switch (imBPP) {
            case 8:  // 8 bits per pixel
              ximage->data[imWide*y + x] = color;
              break;
            case 16: // 16 bits per pixel
              offset = imWide*y + 2*x;
              b0 = color >> 0;
              b1 = color >> 8;
              if (ximage->byte_order == LSBFirst) {
                ximage->data[offset + 0] = b0;
                ximage->data[offset + 1] = b1;
                }
              else { // MSBFirst
                ximage->data[offset + 0] = b1;
                ximage->data[offset + 1] = b0;
                }
              break;
            case 24: // 24 bits per pixel
              offset = imWide*y + 3*x;
              b0 = color >> 0;
              b1 = color >> 8;
              b2 = color >> 16;
              if (ximage->byte_order == LSBFirst) {
                ximage->data[offset + 0] = b0;
                ximage->data[offset + 1] = b1;
                ximage->data[offset + 2] = b2;
                }
              else { // MSBFirst
                ximage->data[offset + 0] = b2;
                ximage->data[offset + 1] = b1;
                ximage->data[offset + 2] = b0;
                }
              break;
            case 32: // 32 bits per pixel
              offset = imWide*y + 4*x;
              b0 = color >> 0;
              b1 = color >> 8;
              b2 = color >> 16;
              b3 = color >> 24;
              if (ximage->byte_order == LSBFirst) {
                ximage->data[offset + 0] = b0;
                ximage->data[offset + 1] = b1;
                ximage->data[offset + 2] = b2;
                ximage->data[offset + 3] = b3;
                }
              else { // MSBFirst
                ximage->data[offset + 0] = b3;
                ximage->data[offset + 1] = b2;
                ximage->data[offset + 2] = b1;
                ximage->data[offset + 3] = b0;
                }
              break;
            default:
              BX_PANIC(("X_graphics_tile_update: bits_per_pixel %u not implemented",
                (unsigned) imBPP));
              return;
            }
          }
        }
      break;
    default:
      BX_PANIC(("X_graphics_tile_update: bits_per_pixel %u handled by new graphics API",
                (unsigned) vga_bpp));
      return;
    }
  XPutImage(bx_x_display, win, gc, ximage, 0, 0, x0, y0+bx_headerbar_y,
            x_tilesize, y_size);
}

  bx_svga_tileinfo_t *
bx_x_gui_c::graphics_tile_info(bx_svga_tileinfo_t *info)
{
  if (!info) {
    info = (bx_svga_tileinfo_t *)malloc(sizeof(bx_svga_tileinfo_t));
    if (!info) {
      return NULL;
    }
  }

  info->bpp = ximage->bits_per_pixel;
  info->pitch = ximage->bytes_per_line;
  info->red_shift = 0;
  info->green_shift = 0;
  info->blue_shift = 0;
  info->red_mask = ximage->red_mask;
  info->green_mask = ximage->green_mask;
  info->blue_mask = ximage->blue_mask;

  int i, rf, gf, bf;
  unsigned long red, green, blue;

  i = rf = gf = bf = 0;
  red = ximage->red_mask;
  green = ximage->green_mask;
  blue = ximage->blue_mask;

  while (red || rf || green || gf || blue || bf) {
    if (rf) {
      if (!(red & 1)) {
        info->red_shift = i;
        rf = 0;
      }
    }
    else {
      if (red & 1) {
        rf = 1;
      }
    }

    if (gf) {
      if (!(green & 1)) {
        info->green_shift = i;
        gf = 0;
      }
    }
    else {
      if (green & 1) {
        gf = 1;
      }
    }

    if (bf) {
      if (!(blue & 1)) {
        info->blue_shift = i;
        bf = 0;
      }
    }
    else {
      if (blue & 1) {
        bf = 1;
      }
    }

    i++;
    red >>= 1;
    green >>= 1;
    blue >>= 1;
  }

  info->is_indexed = (default_visual->c_class != TrueColor) &&
                     (default_visual->c_class != DirectColor);
  info->is_little_endian = (ximage->byte_order == LSBFirst);

  return info;
}

  Bit8u *
bx_x_gui_c::graphics_tile_get(unsigned x0, unsigned y0,
                          unsigned *w, unsigned *h)
{
  if (x0+x_tilesize > dimension_x) {
    *w = dimension_x - x0;
  }
  else {
    *w = x_tilesize;
  }

  if (y0+y_tilesize > dimension_y) {
    *h = dimension_y - y0;
  }
  else {
    *h = y_tilesize;
  }

  return (Bit8u *)ximage->data + ximage->xoffset*ximage->bits_per_pixel/8;
}

  void
bx_x_gui_c::graphics_tile_update_in_place(unsigned x0, unsigned y0,
                                      unsigned w, unsigned h)
{
  XPutImage(bx_x_display, win, gc, ximage, 0, 0,
            x0, y0+bx_headerbar_y, w, h);
}

  bx_bool
bx_x_gui_c::palette_change(unsigned index, unsigned red, unsigned green, unsigned blue)
{
  // returns: 0=no screen update needed (color map change has direct effect)
  //          1=screen updated needed (redraw using current colormap)
  XColor color;

  color.flags = DoRed | DoGreen | DoBlue;
  color.red   = red << 8;
  color.green = green << 8;
  color.blue  = blue << 8;

  if (SIM->get_param_bool(BXPN_PRIVATE_COLORMAP)->get()) {
    color.pixel = index;
    XStoreColor(bx_x_display, default_cmap, &color);
    return(0); // no screen update needed
    }
  else {
    XAllocColor(bx_x_display, DefaultColormap(bx_x_display, bx_x_screen_num),
                &color);
    col_vals[index] = color.pixel;
    return(1); // screen update needed
    }
}


  void
bx_x_gui_c::dimension_update(unsigned x, unsigned y, unsigned fheight, unsigned fwidth, unsigned bpp)
{
  if ((bpp == 8) || (bpp == 15) || (bpp == 16) || (bpp == 24) || (bpp == 32)) {
    vga_bpp = bpp;
  } else {
    BX_PANIC(("%d bpp graphics mode not supported", bpp));
  }
  if (fheight > 0) {
    font_height = fheight;
    font_width = fwidth;
    text_cols = x / font_width;
    text_rows = y / font_height;
  }
  if ( (x != dimension_x) || (y != dimension_y) ) {
    XSizeHints hints;
    long supplied_return;

    if ( XGetWMNormalHints(bx_x_display, win, &hints, &supplied_return) &&
         supplied_return & PMaxSize ) {
      hints.max_width = hints.min_width = x;
      hints.max_height = hints.min_height = y+bx_headerbar_y+bx_statusbar_y;
      XSetWMNormalHints(bx_x_display, win, &hints);
      }
    XResizeWindow(bx_x_display, win, x, y+bx_headerbar_y+bx_statusbar_y);
    dimension_x = x;
    dimension_y = y;
  }
}


  void
bx_x_gui_c::show_headerbar(void)
{
  unsigned xorigin;
  int xleft, xright, sb_ypos;

  sb_ypos = dimension_y + bx_headerbar_y;
  // clear header bar and status bar area to white
  XFillRectangle(bx_x_display, win, gc_headerbar_inv, 0,0, dimension_x, bx_headerbar_y);
  XFillRectangle(bx_x_display, win, gc_headerbar_inv, 0,sb_ypos, dimension_x, bx_statusbar_y);

  xleft = 0;
  xright = dimension_x;
  for (unsigned i=0; i<bx_headerbar_entries; i++) {
    if (bx_headerbar_entry[i].alignment == BX_GRAVITY_LEFT) {
      xorigin = bx_headerbar_entry[i].xorigin;
      xleft += bx_headerbar_entry[i].xdim;
      }
    else {
      xorigin = dimension_x - bx_headerbar_entry[i].xorigin;
      xright = xorigin;
      }
    if (xright < xleft) break;
    XCopyPlane(bx_x_display, bx_headerbar_entry[i].bitmap, win, gc_headerbar,
      0,0, bx_headerbar_entry[i].xdim, bx_headerbar_entry[i].ydim,
              xorigin, 0, 1);
    }
  for (unsigned i=0; i<12; i++) {
    xleft = bx_statusitem_pos[i];
    if (i > 0) {
      XDrawLine(bx_x_display, win, gc_inv, xleft, sb_ypos+1, xleft,
                sb_ypos+bx_statusbar_y);
      if (i <= statusitem_count) {
        set_status_text(i, statusitem_text[i-1], bx_statusitem_active[i]);
      }
    } else {
      set_status_text(0, bx_status_info_text, 0);
    }
  }
}


  unsigned
bx_x_gui_c::create_bitmap(const unsigned char *bmap, unsigned xdim, unsigned ydim)
{
  if (bx_bitmap_entries >= BX_MAX_PIXMAPS) {
    BX_PANIC(("x: too many pixmaps, increase BX_MAX_PIXMAPS"));
    }

  bx_bitmaps[bx_bitmap_entries].bmap =
    XCreateBitmapFromData(bx_x_display, win, (const char *) bmap, xdim, ydim);
  bx_bitmaps[bx_bitmap_entries].xdim = xdim;
  bx_bitmaps[bx_bitmap_entries].ydim = ydim;
  if (!bx_bitmaps[bx_bitmap_entries].bmap) {
    BX_PANIC(("x: could not create bitmap"));
    }
  bx_bitmap_entries++;
  return(bx_bitmap_entries-1); // return index as handle
}


  unsigned
bx_x_gui_c::headerbar_bitmap(unsigned bmap_id, unsigned alignment, void (*f)(void))
{
  unsigned hb_index;

  if ( (bx_headerbar_entries+1) > BX_MAX_HEADERBAR_ENTRIES )
    BX_PANIC(("x: too many headerbar entries, increase BX_MAX_HEADERBAR_ENTRIES"));

  bx_headerbar_entries++;
  hb_index = bx_headerbar_entries - 1;

  bx_headerbar_entry[hb_index].bitmap = bx_bitmaps[bmap_id].bmap;
  bx_headerbar_entry[hb_index].xdim   = bx_bitmaps[bmap_id].xdim;
  bx_headerbar_entry[hb_index].ydim   = bx_bitmaps[bmap_id].ydim;
  bx_headerbar_entry[hb_index].alignment = alignment;
  bx_headerbar_entry[hb_index].f = f;
  if (alignment == BX_GRAVITY_LEFT) {
    bx_headerbar_entry[hb_index].xorigin = bx_bitmap_left_xorigin;
    bx_headerbar_entry[hb_index].yorigin = 0;
    bx_bitmap_left_xorigin += bx_bitmaps[bmap_id].xdim;
    }
  else { // BX_GRAVITY_RIGHT
    bx_bitmap_right_xorigin += bx_bitmaps[bmap_id].xdim;
    bx_headerbar_entry[hb_index].xorigin = bx_bitmap_right_xorigin;
    bx_headerbar_entry[hb_index].yorigin = 0;
    }
  return(hb_index);
}

  void
bx_x_gui_c::replace_bitmap(unsigned hbar_id, unsigned bmap_id)
{
  unsigned xorigin;

  bx_headerbar_entry[hbar_id].bitmap = bx_bitmaps[bmap_id].bmap;

  if (bx_headerbar_entry[hbar_id].alignment == BX_GRAVITY_LEFT)
    xorigin = bx_headerbar_entry[hbar_id].xorigin;
  else
    xorigin = dimension_x - bx_headerbar_entry[hbar_id].xorigin;
  XCopyPlane(bx_x_display, bx_headerbar_entry[hbar_id].bitmap, win, gc_headerbar,
    0,0, bx_headerbar_entry[hbar_id].xdim, bx_headerbar_entry[hbar_id].ydim,
            xorigin, 0, 1);
}


  void
headerbar_click(int x, int y)
{
  int xorigin;

  // assuming y is in bounds
  UNUSED(y);
  for (unsigned i=0; i<bx_headerbar_entries; i++) {
    if (bx_headerbar_entry[i].alignment == BX_GRAVITY_LEFT)
      xorigin = bx_headerbar_entry[i].xorigin;
    else
      xorigin = dimension_x - bx_headerbar_entry[i].xorigin;
    if ( (x>=xorigin) && (x<(xorigin+int(bx_headerbar_entry[i].xdim))) ) {
      bx_headerbar_entry[i].f();
      return;
      }
    }
}

  void
bx_x_gui_c::exit(void)
{
  if (!x_init_done) return;

  // Delete the font bitmaps
  for (int i=0; i<256; i++) {
    //if (vgafont[i] != NULL) 
      XFreePixmap(bx_x_display,vgafont[i]);
  }

  if (bx_x_display)
    XCloseDisplay (bx_x_display);
  BX_INFO(("Exit."));
}

static void warp_cursor (int dx, int dy)
{
      if (SIM->get_param_bool(BXPN_MOUSE_ENABLED)->get() &&
	  (warp_dx || warp_dy || dx || dy)
	  ) {
	    warp_dx = dx;
	    warp_dy = dy;
	    XWarpPointer(bx_x_display, None, None, 0, 0, 0, 0, dx, dy);
      }
}

static void disable_cursor ()
{
      static Cursor cursor;
      static unsigned cursor_created = 0;

      static int shape_width = 16,
	     shape_height = 16,
	     mask_width = 16,
	     mask_height = 16;

      static Bit32u shape_bits[(16*16)/32] = {
	    0x00000000, 0x00000000, 0x00000000, 0x00000000,
	    0x00000000, 0x00000000, 0x00000000, 0x00000000,
      };
      static Bit32u mask_bits[(16*16)/32] = {
	    0x00000000, 0x00000000, 0x00000000, 0x00000000,
	    0x00000000, 0x00000000, 0x00000000, 0x00000000,
      };

      if (!cursor_created) {
	    Pixmap shape, mask;
	    XColor white, black;
	    shape = XCreatePixmapFromBitmapData(bx_x_display,
						RootWindow(bx_x_display,bx_x_screen_num),
						(char*)shape_bits,
						shape_width,
						shape_height,
						1, 0, 1);
	    mask =  XCreatePixmapFromBitmapData(bx_x_display,
						RootWindow(bx_x_display,bx_x_screen_num),
						(char*)mask_bits,
						mask_width,
						mask_height,
						1, 0, 1);
	    XParseColor(bx_x_display, default_cmap, "black", &black);
	    XParseColor(bx_x_display, default_cmap, "white", &white);
	    cursor = XCreatePixmapCursor(bx_x_display, shape, mask,
					 &white, &black, 1, 1);
	    cursor_created = 1;
      }

      XDefineCursor(bx_x_display, win, cursor);
}

static void enable_cursor ()
{
      XUndefineCursor(bx_x_display, win);
}

/* convertStringToXKeysym is a keymap callback
 * used when reading the keymap file.
 * It converts a Symblic String to a GUI Constant
 *
 * It returns a Bit32u constant or BX_KEYMAP_UNKNOWN if it fails
 */
static Bit32u convertStringToXKeysym (const char *string)
{
    if (strncmp ("XK_", string, 3) != 0)
      return BX_KEYMAP_UNKNOWN;
    KeySym keysym=XStringToKeysym(string+3);

    // failure, return unknown
    if(keysym==NoSymbol) return BX_KEYMAP_UNKNOWN;

    return((Bit32u)keysym);
}

#if BX_USE_IDLE_HACK

/* BX_USE_IDLE_HACK: a small idle hack by
 * Roland.Mainz@informatik.med.uni-giessen.de to prevent bochs
 * from consuming 100% CPU time even when it is not required (for
 * example, the OS in the emulator calls HLT to wait for an interupt)
 * pro:
 * - no more 100% CPU usage
 * contra:
 * - we're sleeping too long
 * - bochs still consumes ~10%-20% CPU time while executing an idle 
 *   linux kernel
 * - this is an hack
 */

/* XPeekEvent() with timeout 
 * (adopted from mozilla/gfx/src/xprint/xprintutil_printtofile.c#XNextEventTimeout())
 */
static
Bool XPeekEventTimeout( Display *display, XEvent *event_return, struct timeval *timeout ) 
{
    int      res;
    fd_set   readfds;
    int      display_fd = XConnectionNumber(display);

    /* small shortcut... */
    if( timeout == NULL )
    {
      XPeekEvent(display, event_return);
      return(True);
    }
    
    FD_ZERO(&readfds);
    FD_SET(display_fd, &readfds);

    /* Note/bug: In the case of internal X events (like used to trigger callbacks 
     * registered by XpGetDocumentData()&co.) select() will return with "new info" 
     * - but XNextEvent() below processes these _internal_ events silently - and 
     * will block if there are no other non-internal events.
     * The workaround here is to check with XEventsQueued() if there are non-internal 
     * events queued - if not select() will be called again - unfortunately we use 
     * the old timeout here instead of the "remaining" time... (this only would hurt 
     * if the timeout would be really long - but for current use with values below
     * 1/2 secs it does not hurt... =:-)
     */
    while( XEventsQueued(display, QueuedAfterFlush) == 0 )
    {
      res = select(display_fd+1, &readfds, NULL, NULL, timeout);
    
      switch(res)
      {
        case -1: /* select() error - should not happen */ 
          if (errno == EINTR) 
             break; // caused e.g. by alarm(3)
          perror("XPeekEventTimeout: select() failure"); 
          return(False);

        case  0: /* timeout */
          return(False);
      }
    }
    
    XPeekEvent(display, event_return); 
    return(True);
}

void bx_x_gui_c::sim_is_idle () {
  XEvent dummy;
  struct timeval   timeout;   
  timeout.tv_sec  = 0;
  timeout.tv_usec = 1000; /* 1/1000 s */  
  XPeekEventTimeout(bx_x_display, &dummy, &timeout);
}
#endif /* BX_USE_IDLE_HACK */  

void bx_x_gui_c::beep_on(float frequency)
{
  BX_INFO(( "X11 Beep ON (frequency=%.2f)",frequency));
}

void bx_x_gui_c::beep_off()
{
  BX_INFO(( "X11 Beep OFF"));
}

void bx_x_gui_c::get_capabilities(Bit16u *xres, Bit16u *yres, Bit16u *bpp)
{
  *xres = 1024;
  *yres = 768;
  *bpp = 32;
}

#if BX_SHOW_IPS
void bx_x_gui_c::show_ips(Bit32u ips_count)
{
  if (x11_mouse_msg_counter == 0) {
    if (!x11_ips_update) {
      sprintf(x11_ips_text, "IPS: %9u", ips_count);
      x11_ips_update = 1;
    }
  } else {
    x11_mouse_msg_counter--;
  }
}
#endif

// X11 dialog box functions

void x11_create_button(Display *display, Drawable dialog, GC gc, int x, int y,
                       unsigned int width, unsigned int height, const char *text)
{
  XDrawRectangle(display, dialog, gc, x, y, width, height);
  XDrawImageString(display, dialog, gc, x+4, y+14, (char *)text, strlen(text));
}

int x11_ask_dialog(BxEvent *event)
{
#if BX_DEBUGGER || BX_GDBSTUB
  const int button_x[4] = { 36, 121, 206, 291 };
  const int ask_code[4] = { BX_LOG_ASK_CHOICE_CONTINUE,
                            BX_LOG_ASK_CHOICE_CONTINUE_ALWAYS,
                            BX_LOG_ASK_CHOICE_ENTER_DEBUG,
                            BX_LOG_ASK_CHOICE_DIE };
  const int num_ctrls = 4;
#else
  const int button_x[3] = { 81, 166, 251 };
  const int ask_code[3] = { BX_LOG_ASK_CHOICE_CONTINUE,
                            BX_LOG_ASK_CHOICE_CONTINUE_ALWAYS,
                            BX_LOG_ASK_CHOICE_DIE };
  const int num_ctrls = 3;
#endif
  Window dialog;
  XSizeHints hint;
  XEvent xevent;
  GC gc, gc_inv;
  KeySym key;
  int done, i, level, cpos;
  int retcode = -1;
  int valid = 0, control = num_ctrls - 1, oldctrl = -1;
  unsigned long black_pixel, white_pixel;
  char name[16], text[10], device[16], message[512];

  level = event->u.logmsg.level;
  strcpy(name, SIM->get_log_level_name(level));
  sprintf(device, "Device: %s", event->u.logmsg.prefix);
  sprintf(message, "Message: %s", event->u.logmsg.msg);
  hint.flags = PPosition | PSize | PMinSize | PMaxSize;
  hint.x = 100;
  hint.y = 100;
  hint.width = hint.min_width = hint.max_width = 400;
  hint.height = hint.min_height = hint.max_height = 115;
  black_pixel = BlackPixel(bx_x_display, bx_x_screen_num);
  white_pixel = WhitePixel(bx_x_display, bx_x_screen_num);
  dialog = XCreateSimpleWindow(bx_x_display, RootWindow(bx_x_display,bx_x_screen_num),
    hint.x, hint.y, hint.width, hint.height, 4, black_pixel, white_pixel);
  XSetStandardProperties(bx_x_display, dialog, name, name, None, NULL, 0, &hint);
  Atom wm_delete = XInternAtom(bx_x_display, "WM_DELETE_WINDOW", 1);
  XSetWMProtocols(bx_x_display, dialog, &wm_delete, 1);

  gc = XCreateGC(bx_x_display, dialog, 0, 0);
  gc_inv = XCreateGC(bx_x_display, dialog, 0, 0);
  XSetState(bx_x_display, gc_inv, white_pixel, black_pixel, GXcopy, AllPlanes);
  XSetBackground(bx_x_display,gc,WhitePixel(bx_x_display, bx_x_screen_num));
  XSetForeground(bx_x_display,gc,BlackPixel(bx_x_display, bx_x_screen_num));

  XSelectInput(bx_x_display, dialog, ButtonPressMask
               | ButtonReleaseMask
               | KeyPressMask
               | KeyReleaseMask
               | ExposureMask
               | PointerMotionMask
               | EnterWindowMask
               | LeaveWindowMask);
  XMapWindow(bx_x_display, dialog);
  XFlush(bx_x_display);
  done = 0;
  while (!done) {
    XNextEvent(bx_x_display, &xevent);
    switch (xevent.type) {
      case Expose:
        if (xevent.xexpose.count == 0) {
          XDrawImageString(xevent.xexpose.display, dialog,
                           gc, 20, 25, device, strlen(device));
          if (strlen(message) > 62) {
            cpos = 62;
            while ((cpos > 0) && (!isspace(message[cpos]))) cpos--;
            XDrawImageString(xevent.xexpose.display, dialog,
                             gc, 20, 45, message, cpos);
            XDrawImageString(xevent.xexpose.display, dialog,
                             gc, 74, 63, message+cpos+1, strlen(message)-cpos-1);
          } else {
            XDrawImageString(xevent.xexpose.display, dialog,
                             gc, 20, 45, message, strlen(message));
          }
          x11_create_button(xevent.xexpose.display, dialog,
                            gc, button_x[0] + 2, 80, 65, 20, "Continue");
          x11_create_button(xevent.xexpose.display, dialog,
                            gc, button_x[1] + 2, 80, 65, 20, "Alwayscont");
#if BX_DEBUGGER || BX_GDBSTUB
          x11_create_button(xevent.xexpose.display, dialog,
                            gc, button_x[2] + 2, 80, 65, 20, "Debugger");
#endif
          x11_create_button(xevent.xexpose.display, dialog,
                            gc, button_x[num_ctrls-1] + 2, 80, 65, 20, "Quit");
          oldctrl = control - 1;
          if (oldctrl < 0) oldctrl = 1;
        }
        break;
      case ButtonPress:
        if (xevent.xbutton.button == Button1) {
          if ((xevent.xbutton.y > 80) && (xevent.xbutton.y < 100)) {
            if ((xevent.xbutton.x > (button_x[0] + 2)) && (xevent.xbutton.x < (button_x[0] + 68))) {
              control = 0;
              valid = 1;
            } else if ((xevent.xbutton.x > (button_x[1] + 2)) && (xevent.xbutton.x < (button_x[1] + 68))) {
              control = 1;
              valid = 1;
            } else if ((xevent.xbutton.x > (button_x[2] + 2)) && (xevent.xbutton.x < (button_x[2] + 68))) {
              control = 2;
              valid = 1;
#if BX_DEBUGGER || BX_GDBSTUB
            } else if ((xevent.xbutton.x > (button_x[3] + 2)) && (xevent.xbutton.x < (button_x[3] + 68))) {
              control = 3;
              valid = 1;
#endif
            }
          }
        }
        break;
      case ButtonRelease:
        if ((xevent.xbutton.button == Button1) && (valid == 1)) {
          done = 1;
        }
        break;
      case KeyPress:
        i = XLookupString((XKeyEvent *)&xevent, text, 10, &key, 0);
        if (key == XK_Tab) {
          control++;
          if (control >= num_ctrls) control = 0;
        } else if (key == XK_Escape) {
          control = num_ctrls - 1;
          done = 1;
        } else if ((key == XK_space) || (key == XK_Return)) {
          done = 1;
        }
        break;
      case ClientMessage:
        if (!strcmp(XGetAtomName(bx_x_display, xevent.xclient.message_type), "WM_PROTOCOLS")) {
          control = num_ctrls - 1;
          done = 1;
        }
        break;
    }
    if (control != oldctrl) {
      XDrawRectangle(bx_x_display, dialog, gc_inv, button_x[oldctrl], 78, 69, 24);
      XDrawRectangle(bx_x_display, dialog, gc, button_x[control], 78, 69, 24);
      oldctrl = control;
    }
  }
  retcode = ask_code[control];
  XFreeGC(bx_x_display, gc);
  XFreeGC(bx_x_display, gc_inv);
  XDestroyWindow(bx_x_display, dialog);
  return retcode;
}

int x11_string_dialog(bx_param_string_c *param)
{
  Window dialog;
  XSizeHints hint;
  XEvent xevent;
  GC gc, gc_inv;
  KeySym key;
  int valid = 0, control = 0, oldctrl = -1;
  int done, i;
  unsigned long black_pixel, white_pixel;
  char editstr[24], name[80], text[10], value[24];

  strcpy(name, param->get_name());
  strcpy(value, param->getptr());
  hint.flags = PPosition | PSize | PMinSize | PMaxSize;
  hint.x = 100;
  hint.y = 100;
  hint.width = hint.min_width = hint.max_width = 250;
  hint.height = hint.min_height = hint.max_height = 90;
  black_pixel = BlackPixel(bx_x_display, bx_x_screen_num);
  white_pixel = WhitePixel(bx_x_display, bx_x_screen_num);
  dialog = XCreateSimpleWindow(bx_x_display, RootWindow(bx_x_display,bx_x_screen_num),
    hint.x, hint.y, hint.width, hint.height, 4, black_pixel, white_pixel);
  XSetStandardProperties(bx_x_display, dialog, name, name, None, NULL, 0, &hint);
  Atom wm_delete = XInternAtom(bx_x_display, "WM_DELETE_WINDOW", 1);
  XSetWMProtocols(bx_x_display, dialog, &wm_delete, 1);

  gc = XCreateGC(bx_x_display, dialog, 0, 0);
  gc_inv = XCreateGC(bx_x_display, dialog, 0, 0);
  XSetState(bx_x_display, gc_inv, white_pixel, black_pixel, GXcopy, AllPlanes);
  XSetBackground(bx_x_display,gc,WhitePixel(bx_x_display, bx_x_screen_num));
  XSetForeground(bx_x_display,gc,BlackPixel(bx_x_display, bx_x_screen_num));

  XSelectInput(bx_x_display, dialog, ButtonPressMask
               | ButtonReleaseMask
               | KeyPressMask
               | KeyReleaseMask
               | ExposureMask
               | PointerMotionMask
               | EnterWindowMask
               | LeaveWindowMask);
  XMapWindow(bx_x_display, dialog);
  XFlush(bx_x_display);
  done = 0;
  while (!done) {
    XNextEvent(bx_x_display, &xevent);
    switch (xevent.type) {
      case Expose:
        if (xevent.xexpose.count == 0) {
          sprintf(editstr, "%s%s", value, "_ ");
          XDrawRectangle(xevent.xexpose.display, dialog, gc, 45, 20, 160, 20);
          XDrawImageString(xevent.xexpose.display, dialog, gc, 49, 34, editstr, strlen(editstr));
          x11_create_button(xevent.xexpose.display, dialog,
                            gc, 55, 60, 65, 20, "OK");
          x11_create_button(xevent.xexpose.display, dialog,
                            gc, 130, 60, 65, 20, "Cancel");
          oldctrl = control - 1;
          if (oldctrl < 0) oldctrl = 1;
        }
        break;
      case ButtonPress:
        if (xevent.xbutton.button == Button1) {
          if ((xevent.xbutton.y > 60) && (xevent.xbutton.y < 80)) {
            if ((xevent.xbutton.x > 55) && (xevent.xbutton.x < 120)) {
              control = 1;
              valid = 1;
            } else if ((xevent.xbutton.x > 130) && (xevent.xbutton.x < 195)) {
              control = 2;
              valid = 1;
            }
          } else if ((xevent.xbutton.y > 20) && (xevent.xbutton.y < 40)) {
            if ((xevent.xbutton.x > 45) && (xevent.xbutton.x < 205)) {
              control = 0;
              valid = 1;
            }
          }
        }
        break;
      case ButtonRelease:
        if ((xevent.xbutton.button == Button1) && (valid == 1)) {
          if (control > 0) {
            done = 1;
          }
        }
        break;
      case KeyPress:
        i = XLookupString((XKeyEvent *)&xevent, text, 10, &key, 0);
        if (key == XK_Tab) {
          control++;
          if (control == 3) control = 0;
        } else if (key == XK_Escape) {
          control = 2;
          done = 1;
        } else if (control > 0) {
          if ((key == XK_space) || (key == XK_Return)) {
            done = 1;
          }
        } else {
          if (key == XK_Return) {
            control = 1;
            done = 1;
          } else if (key == XK_BackSpace) {
            if (strlen(value) > 0) {
              value[strlen(value)-1] = 0;
              oldctrl = -1;
            }
          } else if ((i == 1) && (strlen(value) < 20)) {
            strcat(value, text);
            oldctrl = -1;
          }
        }
        break;
      case ClientMessage:
        if (!strcmp(XGetAtomName(bx_x_display, xevent.xclient.message_type), "WM_PROTOCOLS")) {
          control = 2;
          done = 1;
        }
        break;
    }
    if (control != oldctrl) {
      if (oldctrl > 0) {
        XDrawRectangle(bx_x_display, dialog, gc_inv, oldctrl==1?53:128, 58, 69, 24);
      } else if (oldctrl == 0) {
        sprintf(editstr, "%s%s", value, " ");
        XDrawImageString(bx_x_display, dialog, gc, 49, 34, editstr, strlen(editstr));
      }
      if (control > 0) {
        XDrawRectangle(bx_x_display, dialog, gc, control==1?53:128, 58, 69, 24);
      } else {
        sprintf(editstr, "%s%s", value, "_ ");
        XDrawImageString(bx_x_display, dialog, gc, 49, 34, editstr, strlen(editstr));
      }
      oldctrl = control;
    }
  }
  if (control == 1) param->set(value);
  if (control == 2) control = -1;
  XFreeGC(bx_x_display, gc);
  XFreeGC(bx_x_display, gc_inv);
  XDestroyWindow(bx_x_display, dialog);
  return control;
}

BxEvent *
x11_notify_callback (void *unused, BxEvent *event)
{
  int opts;
  bx_param_c *param;
  bx_param_string_c *sparam;

  switch (event->type)
  {
    case BX_SYNC_EVT_LOG_ASK:
      event->retcode = x11_ask_dialog(event);
      return event;
    case BX_SYNC_EVT_ASK_PARAM:
      param = event->u.param.param;
      if (param->get_type() == BXT_PARAM_STRING) {
        sparam = (bx_param_string_c *)param;
        opts = sparam->get_options()->get();
        if ((opts & sparam->IS_FILENAME) == 0) {
          event->retcode = x11_string_dialog(sparam);
          return event;
        }
      }
    case BX_SYNC_EVT_TICK: // called periodically by siminterface.
    case BX_ASYNC_EVT_REFRESH: // called when some bx_param_c parameters have changed.
      // fall into default case
    default:
      return (*old_callback)(old_callback_arg, event);
  }
}

#endif /* if BX_WITH_X11 */