gdkscreen-x11.c

linux下电话本所依赖的一些图形库

 *
 * Since: 2.2
 **/
void 
gdk_screen_get_monitor_geometry (GdkScreen    *screen,
				 gint          monitor_num,
				 GdkRectangle *dest)
{
  g_return_if_fail (GDK_IS_SCREEN (screen));
  g_return_if_fail (monitor_num < GDK_SCREEN_X11 (screen)->num_monitors);
  g_return_if_fail (monitor_num >= 0);

  *dest = GDK_SCREEN_X11 (screen)->monitors[monitor_num];
}

/**
 * gdk_x11_screen_get_xscreen:
 * @screen: a #GdkScreen.
 * @returns: an Xlib <type>Screen*</type>
 *
 * Returns the screen of a #GdkScreen.
 *
 * Since: 2.2
 */
Screen *
gdk_x11_screen_get_xscreen (GdkScreen *screen)
{
  return GDK_SCREEN_X11 (screen)->xscreen;
}


/**
 * gdk_x11_screen_get_screen_number:
 * @screen: a #GdkScreen.
 * @returns: the position of @screen among the screens of
 *   its display.
 *
 * Returns the index of a #GdkScreen.
 *
 * Since: 2.2
 */
int
gdk_x11_screen_get_screen_number (GdkScreen *screen)
{
  return GDK_SCREEN_X11 (screen)->screen_num;
}

GdkScreen *
_gdk_x11_screen_new (GdkDisplay *display,
		     gint	 screen_number) 
{
  GdkScreen *screen;
  GdkScreenX11 *screen_x11;
  GdkDisplayX11 *display_x11 = GDK_DISPLAY_X11 (display);

  screen = g_object_new (GDK_TYPE_SCREEN_X11, NULL);

  screen_x11 = GDK_SCREEN_X11 (screen);
  screen_x11->display = display;
  screen_x11->xdisplay = display_x11->xdisplay;
  screen_x11->xscreen = ScreenOfDisplay (display_x11->xdisplay, screen_number);
  screen_x11->screen_num = screen_number;
  screen_x11->xroot_window = RootWindow (display_x11->xdisplay,screen_number);
  screen_x11->wmspec_check_window = None;
  /* we want this to be always non-null */
  screen_x11->window_manager_name = g_strdup ("unknown");
  
  init_xinerama_support (screen);
  init_randr_support (screen);
  
  _gdk_visual_init (screen);
  _gdk_windowing_window_init (screen);

  return screen;
}

#ifdef HAVE_XINERAMA
static gboolean
check_solaris_xinerama (GdkScreen *screen)
{
#ifdef HAVE_SOLARIS_XINERAMA
  
  if (XineramaGetState (GDK_SCREEN_XDISPLAY (screen),
			gdk_screen_get_number (screen)))
    {
      XRectangle monitors[MAXFRAMEBUFFERS];
      unsigned char hints[16];
      gint result;
      GdkScreenX11 *screen_x11 = GDK_SCREEN_X11 (screen);

      result = XineramaGetInfo (GDK_SCREEN_XDISPLAY (screen),
				gdk_screen_get_number (screen),
				monitors, hints,
				&screen_x11->num_monitors);
      /* Yes I know it should be Success but the current implementation 
          returns the num of monitor*/
      if (result == 0)
	{
	  /* FIXME: We need to trap errors, since XINERAMA isn't always XINERAMA.
	   */ 
	  g_error ("error while retrieving Xinerama information");
	}
      else
	{
	  int i;
	  screen_x11->monitors = g_new0 (GdkRectangle, screen_x11->num_monitors);
	  
	  for (i = 0; i < screen_x11->num_monitors; i++)
	    {
	      screen_x11->monitors[i].x = monitors[i].x;
	      screen_x11->monitors[i].y = monitors[i].y;
	      screen_x11->monitors[i].width = monitors[i].width;
	      screen_x11->monitors[i].height = monitors[i].height;
	    }

	  return TRUE;
	}
    }
#endif /* HAVE_SOLARIS_XINERAMA */
  
  return FALSE;
}

static gboolean
check_xfree_xinerama (GdkScreen *screen)
{
#ifdef HAVE_XFREE_XINERAMA
  if (XineramaIsActive (GDK_SCREEN_XDISPLAY (screen)))
    {
      GdkScreenX11 *screen_x11 = GDK_SCREEN_X11 (screen);
      XineramaScreenInfo *monitors = XineramaQueryScreens (GDK_SCREEN_XDISPLAY (screen),
							   &screen_x11->num_monitors);
      if (screen_x11->num_monitors <= 0)
	{
	  /* FIXME: We need to trap errors, since XINERAMA isn't always XINERAMA.
	   *        I don't think the num_monitors <= 0 check has any validity.
	   */ 
	  g_error ("error while retrieving Xinerama information");
	}
      else
	{
	  int i;
	  screen_x11->monitors = g_new0 (GdkRectangle, screen_x11->num_monitors);
	  
	  for (i = 0; i < screen_x11->num_monitors; i++)
	    {
	      screen_x11->monitors[i].x = monitors[i].x_org;
	      screen_x11->monitors[i].y = monitors[i].y_org;
	      screen_x11->monitors[i].width = monitors[i].width;
	      screen_x11->monitors[i].height = monitors[i].height;
	    }

	  XFree (monitors);

	  return TRUE;
	}
    }
#endif /* HAVE_XFREE_XINERAMA */
  
  return FALSE;
}
#endif /* HAVE_XINERAMA */

static void
init_xinerama_support (GdkScreen * screen)
{
  GdkScreenX11 *screen_x11 = GDK_SCREEN_X11 (screen);
#ifdef HAVE_XINERAMA
  int opcode, firstevent, firsterror;
#endif

  if (screen_x11->monitors)
    g_free (screen_x11->monitors);
  
#ifdef HAVE_XINERAMA  
  if (XQueryExtension (GDK_SCREEN_XDISPLAY (screen), "XINERAMA",
		       &opcode, &firstevent, &firsterror))
    {
      if (check_solaris_xinerama (screen) ||
	  check_xfree_xinerama (screen))
	return;
    }
#endif /* HAVE_XINERAMA */

  /* No Xinerama
   */
#ifdef G_ENABLE_DEBUG
  if (_gdk_debug_flags & GDK_DEBUG_XINERAMA)
    {
      /* Fake Xinerama mode by splitting the screen into 4 monitors.
       * Also draw a little cross to make the monitor boundaries visible.
       */
      XSetWindowAttributes atts;
      Window win;
      gint w, h;

      w = WidthOfScreen (screen_x11->xscreen);
      h = HeightOfScreen (screen_x11->xscreen);
      screen_x11->num_monitors = 4;
      screen_x11->monitors = g_new0 (GdkRectangle, 4);
      screen_x11->monitors[0].x = 0;
      screen_x11->monitors[0].y = 0;
      screen_x11->monitors[0].width = w / 2;
      screen_x11->monitors[0].height = h / 2;
      screen_x11->monitors[1].x = w / 2;
      screen_x11->monitors[1].y = 0;
      screen_x11->monitors[1].width = w / 2;
      screen_x11->monitors[1].height = h / 2;
      screen_x11->monitors[2].x = 0;
      screen_x11->monitors[2].y = h / 2;
      screen_x11->monitors[2].width = w / 2;
      screen_x11->monitors[2].height = h / 2;
      screen_x11->monitors[3].x = w / 2;
      screen_x11->monitors[3].y = h / 2;
      screen_x11->monitors[3].width = w / 2;
      screen_x11->monitors[3].height = h / 2;
      atts.override_redirect = 1;
      atts.background_pixel = WhitePixel(GDK_SCREEN_XDISPLAY (screen), 
					 screen_x11->screen_num);
      win = XCreateWindow(GDK_SCREEN_XDISPLAY (screen), 
			  screen_x11->xroot_window, 0, h / 2, w, 1, 0, 
			  DefaultDepth(GDK_SCREEN_XDISPLAY (screen), 
				       screen_x11->screen_num),
			  InputOutput, 
			  DefaultVisual(GDK_SCREEN_XDISPLAY (screen), 
					screen_x11->screen_num),
			  CWOverrideRedirect|CWBackPixel, 
			  &atts);
      XMapRaised(GDK_SCREEN_XDISPLAY (screen), win); 
      win = XCreateWindow(GDK_SCREEN_XDISPLAY (screen), 
			  screen_x11->xroot_window, w/2 , 0, 1, h, 0, 
			  DefaultDepth(GDK_SCREEN_XDISPLAY (screen), 
				       screen_x11->screen_num),
			  InputOutput, 
			  DefaultVisual(GDK_SCREEN_XDISPLAY (screen), 
					screen_x11->screen_num),
			  CWOverrideRedirect|CWBackPixel, 
			  &atts);
      XMapRaised(GDK_SCREEN_XDISPLAY (screen), win); 
    }
  else
#endif
    {
       screen_x11->num_monitors = 1;
       screen_x11->monitors = g_new0 (GdkRectangle, 1);
       screen_x11->monitors[0].x = 0;
       screen_x11->monitors[0].y = 0;
       screen_x11->monitors[0].width = WidthOfScreen (screen_x11->xscreen);
       screen_x11->monitors[0].height = HeightOfScreen (screen_x11->xscreen);
    }
}

static void
init_randr_support (GdkScreen * screen)
{
  GdkScreenX11 *screen_x11 = GDK_SCREEN_X11 (screen);
  
  XSelectInput (GDK_SCREEN_XDISPLAY (screen),
		screen_x11->xroot_window,
		StructureNotifyMask);
}

void
_gdk_x11_screen_size_changed (GdkScreen *screen,
			      XEvent    *event)
{
#ifdef HAVE_RANDR
  if (!XRRUpdateConfiguration (event))
    return;
#else
  if (event->type == ConfigureNotify)
    {
      XConfigureEvent *rcevent = (XConfigureEvent *) event;
      Screen	    *xscreen = gdk_x11_screen_get_xscreen (screen);
      
      xscreen->width   = rcevent->width;
      xscreen->height  = rcevent->height;
    }
  else
    return;
#endif
  
  init_xinerama_support (screen);
  g_signal_emit_by_name (screen, "size_changed");
}

void
_gdk_x11_screen_window_manager_changed (GdkScreen *screen)
{
  g_signal_emit (screen, signals[WINDOW_MANAGER_CHANGED], 0);
}

/**
 * _gdk_windowing_substitute_screen_number:
 * @display_name : The name of a display, in the form used by 
 *                 gdk_display_open (). If %NULL a default value
 *                 will be used. On X11, this is derived from the DISPLAY
 *                 environment variable.
 * @screen_number : The number of a screen within the display
 *                  referred to by @display_name.
 *
 * Modifies a @display_name to make @screen_number the default
 * screen when the display is opened.
 *
 * Return value: a newly allocated string holding the resulting
 *   display name. Free with g_free().
 */
gchar * 
_gdk_windowing_substitute_screen_number (const gchar *display_name,
					 gint         screen_number)
{
  GString *str;
  gchar   *p;

  if (!display_name)
    display_name = getenv ("DISPLAY");

  if (!display_name)
    return NULL;

  str = g_string_new (display_name);

  p = strrchr (str->str, '.');
  if (p && p >	strchr (str->str, ':'))
    g_string_truncate (str, p - str->str);

  g_string_append_printf (str, ".%d", screen_number);

  return g_string_free (str, FALSE);
}

/**
 * gdk_screen_make_display_name:
 * @screen: a #GdkScreen
 * 
 * Determines the name to pass to gdk_display_open() to get
 * a #GdkDisplay with this screen as the default screen.
 * 
 * Return value: a newly allocated string, free with g_free()
 *
 * Since: 2.2
 **/
gchar *
gdk_screen_make_display_name (GdkScreen *screen)
{
  const gchar *old_display;

  g_return_val_if_fail (GDK_IS_SCREEN (screen), NULL);

  old_display = gdk_display_get_name (gdk_screen_get_display (screen));

  return _gdk_windowing_substitute_screen_number (old_display, 
						  gdk_screen_get_number (screen));
}

#define __GDK_SCREEN_X11_C__
#include "gdkaliasdef.c"