C++ CLUTTER_BACKEND_X11函数代码示例

static void
clutter_stage_x11_get_geometry (ClutterStageWindow    *stage_window,
                                cairo_rectangle_int_t *geometry)
{
  ClutterStageX11 *stage_x11 = CLUTTER_STAGE_X11 (stage_window);
  ClutterStageCogl *stage_cogl = CLUTTER_STAGE_COGL (stage_x11);
  ClutterBackendX11 *backend_x11 = CLUTTER_BACKEND_X11 (stage_cogl->backend);

  geometry->x = geometry->y = 0;

  /* If we're fullscreen, return the size of the display.
   *
   * FIXME - this is utterly broken for anything that is not a single
   * head set up; the window manager will give us the right size in a
   * ConfigureNotify, but between the fullscreen signal emission on the
   * stage and the following frame, the size returned by the stage will
   * be wrong.
   */
  if (_clutter_stage_is_fullscreen (stage_cogl->wrapper) &&
      stage_x11->fullscreening)
    {
      geometry->width = DisplayWidth (backend_x11->xdpy, backend_x11->xscreen_num);
      geometry->height = DisplayHeight (backend_x11->xdpy, backend_x11->xscreen_num);

      return;
    }

  geometry->width = stage_x11->xwin_width;
  geometry->height = stage_x11->xwin_height;
}

static ClutterStageWindow *
clutter_backend_glx_create_stage (ClutterBackend  *backend,
                                  ClutterStage    *wrapper,
                                  GError         **error)
{
  ClutterBackendX11 *backend_x11 = CLUTTER_BACKEND_X11 (backend);
  ClutterStageWindow *stage_window;
  ClutterStageX11 *stage_x11;

  CLUTTER_NOTE (BACKEND, "Creating stage of type '%s'",
                g_type_name (CLUTTER_STAGE_TYPE));

  stage_window = g_object_new (CLUTTER_TYPE_STAGE_GLX, NULL);

  /* copy backend data into the stage */
  stage_x11 = CLUTTER_STAGE_X11 (stage_window);
  stage_x11->wrapper = wrapper;

  CLUTTER_NOTE (BACKEND,
                "GLX stage created[%p] (dpy:%p, screen:%d, root:%u, wrap:%p)",
                stage_window,
                backend_x11->xdpy,
                backend_x11->xscreen_num,
                (unsigned int) backend_x11->xwin_root,
                wrapper);

  return stage_window;
}

static inline void
set_wm_title (ClutterStageX11 *stage_x11)
{
  ClutterStageCogl *stage_cogl = CLUTTER_STAGE_COGL (stage_x11);
  ClutterBackendX11 *backend_x11 = CLUTTER_BACKEND_X11 (stage_cogl->backend);

  if (stage_x11->xwin == None || stage_x11->is_foreign_xwin)
    return;

  if (stage_x11->title == NULL)
    {
      XDeleteProperty (backend_x11->xdpy,
                       stage_x11->xwin, 
                       backend_x11->atom_NET_WM_NAME);
    }
  else
    {
      XChangeProperty (backend_x11->xdpy,
                       stage_x11->xwin, 
                       backend_x11->atom_NET_WM_NAME,
                       backend_x11->atom_UTF8_STRING,
                       8, 
                       PropModeReplace, 
                       (unsigned char *) stage_x11->title,
                       (int) strlen (stage_x11->title));
    }
}

static ClutterStageWindow *
clutter_backend_egl_create_stage (ClutterBackend  *backend,
                                  ClutterStage    *wrapper,
                                  GError         **error)
{
  ClutterBackendX11 *backend_x11 = CLUTTER_BACKEND_X11 (backend);
  ClutterStageX11 *stage_x11;
  ClutterStageWindow *stage;

  CLUTTER_NOTE (BACKEND, "Creating stage of type '%s'",
                g_type_name (CLUTTER_STAGE_TYPE));
  
  stage = g_object_new (CLUTTER_TYPE_STAGE_EGL, NULL);
  
  /* copy backend data into the stage */
  stage_x11 = CLUTTER_STAGE_X11 (stage);
  stage_x11->wrapper = wrapper;
  
  CLUTTER_NOTE (MISC, "EGLX stage created (display:%p, screen:%d, root:%u)",
                backend_x11->xdpy,
                backend_x11->xscreen_num,
                (unsigned int) backend_x11->xwin_root);
  
  return stage;
}

static ClutterStageWindow *
clutter_backend_x11_create_stage (ClutterBackend  *backend,
				  ClutterStage    *wrapper,
				  GError         **error)
{
  ClutterBackendX11 *backend_x11 = CLUTTER_BACKEND_X11 (backend);
  ClutterEventTranslator *translator;
  ClutterStageWindow *stage;

  stage = g_object_new (CLUTTER_TYPE_STAGE_X11,
			"backend", backend,
			"wrapper", wrapper,
			NULL);

  /* the X11 stage does event translation */
  translator = CLUTTER_EVENT_TRANSLATOR (stage);
  _clutter_backend_add_event_translator (backend, translator);

  CLUTTER_NOTE (MISC, "X11 stage created (display:%p, screen:%d, root:%u)",
                backend_x11->xdpy,
                backend_x11->xscreen_num,
                (unsigned int) backend_x11->xwin_root);

  return stage;
}

gboolean
_clutter_stage_x11_get_root_coords (ClutterStageX11 *stage_x11,
                                    gint            *root_x,
                                    gint            *root_y)
{
  ClutterStageCogl *stage_cogl = CLUTTER_STAGE_COGL (stage_x11);
  ClutterBackendX11 *backend_x11 = CLUTTER_BACKEND_X11 (stage_cogl->backend);
  gint return_val;
  Window child;
  gint tx, ty;

  return_val = XTranslateCoordinates (backend_x11->xdpy,
                                      stage_x11->xwin,
                                      backend_x11->xwin_root,
                                      0, 0, &tx, &ty,
                                      &child);

  if (root_x)
    *root_x = tx;

  if (root_y)
    *root_y = ty;

  return (return_val == 0);
}

static void
events_queue (ClutterBackend *backend)
{
  ClutterBackendX11 *backend_x11 = CLUTTER_BACKEND_X11 (backend);
  ClutterBackendX11Class *backend_x11_class =
    CLUTTER_BACKEND_X11_GET_CLASS (backend_x11);
  ClutterEvent      *event;
  Display           *xdisplay = backend_x11->xdpy;
  XEvent             xevent;
  ClutterMainContext  *clutter_context;

  clutter_context = _clutter_context_get_default ();

  while (!clutter_events_pending () && XPending (xdisplay))
    {
      XNextEvent (xdisplay, &xevent);

      if (backend_x11_class->handle_event (backend_x11, &xevent))
        continue;

      event = clutter_event_new (CLUTTER_NOTHING);

      if (event_translate (backend, event, &xevent))
        {
	  /* push directly here to avoid copy of queue_put */
	  g_queue_push_head (clutter_context->events_queue, event);
        }
      else
        {
          clutter_event_free (event);
        }
    }
}

/**
 * clutter_x11_add_filter: (skip)
 * @func: a filter function
 * @data: user data to be passed to the filter function, or %NULL
 *
 * Adds an event filter function.
 *
 * Since: 0.6
 */
void
clutter_x11_add_filter (ClutterX11FilterFunc func,
                        gpointer             data)
{
  ClutterX11EventFilter *filter;
  ClutterBackend *backend = clutter_get_default_backend ();
  ClutterBackendX11 *backend_x11;

  g_return_if_fail (func != NULL);

  if (backend == NULL)
    {
      g_critical ("The Clutter backend has not been initialised");
      return;
    }

  if (!CLUTTER_IS_BACKEND_X11 (backend))
    {
      g_critical ("The Clutter backend is not a X11 backend");
      return;
    }

  backend_x11 = CLUTTER_BACKEND_X11 (backend);

  filter = g_new0 (ClutterX11EventFilter, 1);
  filter->func = func;
  filter->data = data;

  backend_x11->event_filters =
    g_slist_append (backend_x11->event_filters, filter);

  return;
}

/**
 * clutter_x11_get_current_event_time: (skip)
 *
 * Retrieves the timestamp of the last X11 event processed by
 * Clutter. This might be different from the timestamp returned
 * by clutter_get_current_event_time(), as Clutter may synthesize
 * or throttle events.
 *
 * Return value: a timestamp, in milliseconds
 *
 * Since: 1.0
 */
Time
clutter_x11_get_current_event_time (void)
{
  ClutterBackend *backend = clutter_get_default_backend ();

  return CLUTTER_BACKEND_X11 (backend)->last_event_time;
}

static void
clutter_backend_glx_dispose (GObject *gobject)
{
  ClutterBackendGLX *backend_glx = CLUTTER_BACKEND_GLX (gobject);
  ClutterBackendX11 *backend_x11 = CLUTTER_BACKEND_X11 (gobject);

  /* Unrealize all shaders, since the GL context is going away */
  _clutter_shader_release_all ();

  if (backend_glx->gl_context)
    {
      glXMakeContextCurrent (backend_x11->xdpy, None, None, NULL);
      glXDestroyContext (backend_x11->xdpy, backend_glx->gl_context);
      backend_glx->gl_context = None;
    }

  if (backend_glx->dummy_glxwin)
    {
      glXDestroyWindow (backend_x11->xdpy, backend_glx->dummy_glxwin);
      backend_glx->dummy_glxwin = None;
    }

  if (backend_glx->dummy_xwin)
    {
      XDestroyWindow (backend_x11->xdpy, backend_glx->dummy_xwin);
      backend_glx->dummy_xwin = None;
    }

  G_OBJECT_CLASS (clutter_backend_glx_parent_class)->dispose (gobject);
}

static void
clutter_stage_glx_unrealize (ClutterStageWindow *stage_window)
{
  ClutterBackend *backend = clutter_get_default_backend ();
  ClutterBackendX11 *backend_x11 = CLUTTER_BACKEND_X11 (backend);
  ClutterStageX11 *stage_x11 = CLUTTER_STAGE_X11 (stage_window);
  ClutterStageGLX *stage_glx = CLUTTER_STAGE_GLX (stage_window);

  /* Note unrealize should free up any backend stage related resources */
  CLUTTER_NOTE (BACKEND, "Unrealizing stage");

  clutter_x11_trap_x_errors ();

  if (stage_glx->glxwin != None)
    {
      glXDestroyWindow (backend_x11->xdpy, stage_glx->glxwin);
      stage_glx->glxwin = None;
    }

  if (!stage_x11->is_foreign_xwin && stage_x11->xwin != None)
    {
      XDestroyWindow (backend_x11->xdpy, stage_x11->xwin);
      stage_x11->xwin = None;
    }
  else
    stage_x11->xwin = None;

  XSync (backend_x11->xdpy, False);

  clutter_x11_untrap_x_errors ();

  CLUTTER_MARK ();
}

void
_clutter_backend_x11_events_init (ClutterBackend *backend)
{
  ClutterBackendX11 *backend_x11 = CLUTTER_BACKEND_X11 (backend);
  GSource *source;
  ClutterEventSource *event_source;
  int connection_number;
  gchar *name;

  connection_number = ConnectionNumber (backend_x11->xdpy);
  CLUTTER_NOTE (EVENT, "Connection number: %d", connection_number);

  source = backend_x11->event_source = clutter_event_source_new (backend);
  event_source = (ClutterEventSource *) source;
  g_source_set_priority (source, CLUTTER_PRIORITY_EVENTS);

  name = g_strdup_printf ("Clutter X11 Event (connection: %d)",
                          connection_number);
  g_source_set_name (source, name);
  g_free (name);

  event_source->event_poll_fd.fd = connection_number;
  event_source->event_poll_fd.events = G_IO_IN;

  event_sources = g_list_prepend (event_sources, event_source);

  g_source_add_poll (source, &event_source->event_poll_fd);
  g_source_set_can_recurse (source, TRUE);
  g_source_attach (source, NULL);
}

static XkbDescPtr
get_xkb (ClutterKeymapX11 *keymap_x11)
{
  ClutterBackendX11 *backend_x11 = CLUTTER_BACKEND_X11 (keymap_x11->backend);

  if (keymap_x11->max_keycode == 0)
    XDisplayKeycodes (backend_x11->xdpy,
                      &keymap_x11->min_keycode,
                      &keymap_x11->max_keycode);

  if (keymap_x11->xkb_desc == NULL)
    {
      int flags = XkbKeySymsMask
                | XkbKeyTypesMask
                | XkbModifierMapMask
                | XkbVirtualModsMask;

      keymap_x11->xkb_desc = XkbGetMap (backend_x11->xdpy, flags, XkbUseCoreKbd);
      if (G_UNLIKELY (keymap_x11->xkb_desc == NULL))
        {
          g_error ("Failed to get the keymap from XKB");
          return NULL;
        }

      flags = XkbGroupNamesMask | XkbVirtualModNamesMask;
      XkbGetNames (backend_x11->xdpy, flags, keymap_x11->xkb_desc);

      update_modmap (backend_x11->xdpy, keymap_x11);
    }
  else if (keymap_x11->xkb_map_serial != backend_x11->keymap_serial)
    {
      int flags = XkbKeySymsMask
                | XkbKeyTypesMask
                | XkbModifierMapMask
                | XkbVirtualModsMask;

      CLUTTER_NOTE (BACKEND, "Updating XKB keymap");

      XkbGetUpdatedMap (backend_x11->xdpy, flags, keymap_x11->xkb_desc);

      flags = XkbGroupNamesMask | XkbVirtualModNamesMask;
      XkbGetNames (backend_x11->xdpy, flags, keymap_x11->xkb_desc);

      update_modmap (backend_x11->xdpy, keymap_x11);

      keymap_x11->xkb_map_serial = backend_x11->keymap_serial;
    }

  if (keymap_x11->num_lock_mask == 0)
    keymap_x11->num_lock_mask = XkbKeysymToModifiers (backend_x11->xdpy,
                                                      XK_Num_Lock);

  if (keymap_x11->scroll_lock_mask == 0)
    keymap_x11->scroll_lock_mask = XkbKeysymToModifiers (backend_x11->xdpy,
                                                         XK_Scroll_Lock);

  return keymap_x11->xkb_desc;
}

void
_clutter_stage_x11_set_user_time (ClutterStageX11 *stage_x11,
                                  guint32          user_time)
{
  ClutterStageCogl *stage_cogl = CLUTTER_STAGE_COGL (stage_x11);
  ClutterBackendX11 *backend_x11 = CLUTTER_BACKEND_X11 (stage_cogl->backend);

  set_user_time (backend_x11, stage_x11, user_time);
}

static PangoDirection
clutter_backend_x11_get_keymap_direction (ClutterBackend *backend)
{
  ClutterBackendX11 *backend_x11 = CLUTTER_BACKEND_X11 (backend);

  if (G_UNLIKELY (backend_x11->keymap == NULL))
    return PANGO_DIRECTION_NEUTRAL;

  return _clutter_keymap_x11_get_direction (backend_x11->keymap);
}