C++ xcb_disconnect函数代码示例

void
PRESENTDestroy(Display *dpy, PRESENTpriv *present_priv)
{
    PRESENTPixmapPriv *current = NULL;

    pthread_mutex_lock(&present_priv->mutex_present);

    PRESENTForceReleases(present_priv);

    current = present_priv->first_present_priv;
    while (current) {
        PRESENTPixmapPriv *next = current->next;
        PRESENTDestroyPixmapContent(dpy, current);
        free(current);
        current = next;
    }

    PRESENTFreeXcbQueue(present_priv);

    xcb_disconnect(present_priv->xcb_connection);
    xcb_disconnect(present_priv->xcb_connection_bis);
    pthread_mutex_unlock(&present_priv->mutex_present);
    pthread_mutex_destroy(&present_priv->mutex_present);
    pthread_mutex_destroy(&present_priv->mutex_xcb_wait);

    free(present_priv);
}

	void SimplicityApplication::initialize_x_connection(void)
	{
		int nScreenNum = 0;
		m_pXConnection = xcb_connect(m_sDisplayName.c_str(), &nScreenNum);

		if (check_xcb_connection(m_pXConnection))
		{
			xcb_disconnect(m_pXConnection);
			m_bRunning = false;
			return;
		}

		xcb_screen_iterator_t iter = xcb_setup_roots_iterator(xcb_get_setup(m_pXConnection));
		for (int i = 0; i != nScreenNum; i++)
			xcb_screen_next(&iter);

		m_pRootScreen = iter.data;
		if (m_pRootScreen == nullptr)
		{
			global_log_error << "Could not get the current screen. Exiting";
			xcb_disconnect(m_pXConnection);
			m_bRunning = false;
		}

		global_log_debug << "Root screen dimensions: "
						 << m_pRootScreen->width_in_pixels
						 << "x"
						 << m_pRootScreen->height_in_pixels;
		global_log_debug << "Root window: "
						 << m_pRootScreen->root;
	}

static void
cursor_set (xcb_connection_t *c,
            xcb_screen_t     *screen,
            xcb_window_t      window,
            int               cursor_id)
{
  uint32_t             values_list[3];
  xcb_void_cookie_t    cookie_font;
  xcb_void_cookie_t    cookie_gc;
  xcb_generic_error_t *error;
  xcb_font_t           font;
  xcb_cursor_t         cursor;
  xcb_gcontext_t       gc;
  uint32_t             mask;
  uint32_t             value_list;

  font = xcb_generate_id (c);
  cookie_font = xcb_open_font_checked (c, font,
                                       strlen ("cursor"),
                                       "cursor");
  error = xcb_request_check (c, cookie_font);
  if (error) {
    fprintf (stderr, "ERROR: can't open font : %d\n", error->error_code);
    xcb_disconnect (c);
    exit (-1);
  }

  cursor = xcb_generate_id (c);
  xcb_create_glyph_cursor (c, cursor, font, font,
                           cursor_id, cursor_id + 1,
                           0, 0, 0,
                           0, 0, 0);

  gc = xcb_generate_id (c);
  mask = XCB_GC_FOREGROUND | XCB_GC_BACKGROUND | XCB_GC_FONT;
  values_list[0] = screen->black_pixel;
  values_list[1] = screen->white_pixel;
  values_list[2] = font;
  cookie_gc = xcb_create_gc_checked (c, gc, window, mask, values_list);
  error = xcb_request_check (c, cookie_gc);
  if (error) {
    fprintf (stderr, "ERROR: can't create gc : %d\n", error->error_code);
    xcb_disconnect (c);
    exit (-1);
  }

  mask = XCB_CW_CURSOR;
  value_list = cursor;
  xcb_change_window_attributes (c, window, mask, &value_list);

  xcb_free_cursor (c, cursor);

  cookie_font = xcb_close_font_checked (c, font);
  error = xcb_request_check (c, cookie_font);
  if (error) {
    fprintf (stderr, "ERROR: can't close font : %d\n", error->error_code);
    xcb_disconnect (c);
    exit (-1);
  }
}

int
main ()
{
    xcb_connection_t*       connection;
    xcb_screen_t*           screen;
    xcb_window_t            root_window;
    xcb_alloc_color_reply_t *color_reply;
    xcb_colormap_t          colormap = { 0 };
    uint32_t                params[1];
    uint16_t                r,g,b;

    connection = xcb_connect(NULL, NULL);
    if (!connection) {
        fprintf(stderr, "ERROR: can't connect to an X server\n");
        return -1;
    }

    screen = xcb_setup_roots_iterator(xcb_get_setup(connection)).data;
    if (!screen)
    {
        fprintf(stderr, "ERROR: can't setup a screen\n");
        xcb_disconnect(connection);
        return -1;
    }

    root_window = screen->root;
    colormap = screen->default_colormap;

    r = 60000, g = 20000, b = 20000;
    color_reply = xcb_alloc_color_reply(connection,
            xcb_alloc_color(connection, colormap, r, g, b), NULL);

    if(!color_reply)
    {
        fprintf(stderr, "ERROR: can't alloc an color\n");
        xcb_disconnect(connection);
        return 0;
    }

    params[0] = color_reply->pixel;

    // sets the root_window back_pixel to pixel(params)
    xcb_change_window_attributes(connection, root_window, XCB_CW_BACK_PIXEL, params);

    // free color resources
    free(color_reply);

    // waits all things are send??
    xcb_flush(connection);

    // xcb_destroy_window(connection, window);
    xcb_disconnect(connection);

    return 0;
}

static cairo_surface_t *
create_source_surface (int size)
{
#if CAIRO_HAS_XCB_SURFACE
    xcb_render_pictforminfo_t *render_format;
    struct closure *data;
    cairo_surface_t *surface;
    xcb_screen_t *root;
    xcb_void_cookie_t cookie;
    void *formats;

    data = xmalloc (sizeof (struct closure));

    data->connection = xcb_connect (NULL, NULL);
    render_format = find_depth (data->connection, 32, &formats);
    if (render_format == NULL) {
	xcb_disconnect (data->connection);
	free (data);
	return NULL;
    }

    root = xcb_setup_roots_iterator (xcb_get_setup (data->connection)).data;

    data->pixmap = xcb_generate_id (data->connection);
    cookie = xcb_create_pixmap_checked (data->connection, 32,
					data->pixmap, root->root, size, size);
    /* slow, but sure */
    if (xcb_request_check (data->connection, cookie) != NULL) {
	free (formats);
	xcb_disconnect (data->connection);
	free (data);
	return NULL;
    }

    surface = cairo_xcb_surface_create_with_xrender_format (data->connection,
							    root,
							    data->pixmap,
							    render_format,
							    size, size);
    free (formats);

    data->device = cairo_device_reference (cairo_surface_get_device (surface));
    cairo_surface_set_user_data (surface, &closure_key, data, cleanup);

    return surface;
#else
    return NULL;
#endif
}

static xcb_gc_t
gc_font_get (xcb_connection_t *c,
             xcb_screen_t     *screen,
             xcb_window_t      window,
             const char       *font_name)
{
  uint32_t             value_list[3];
  xcb_void_cookie_t    cookie_font;
  xcb_void_cookie_t    cookie_gc;
  xcb_generic_error_t *error;
  xcb_font_t           font;
  xcb_gcontext_t       gc;
  uint32_t             mask;

  font = xcb_generate_id (c);
  cookie_font = xcb_open_font_checked (c, font,
                                       strlen (font_name),
                                       font_name);

  error = xcb_request_check (c, cookie_font);
  if (error) {
    fprintf (stderr, "ERROR: can't open font : %d\n", error->error_code);
    xcb_disconnect (c);
    return -1;
  }

  gc = xcb_generate_id (c);
  mask = XCB_GC_FOREGROUND | XCB_GC_BACKGROUND | XCB_GC_FONT;
  value_list[0] = screen->black_pixel;
  value_list[1] = screen->white_pixel;
  value_list[2] = font;
  cookie_gc = xcb_create_gc_checked (c, gc, window, mask, value_list);
  error = xcb_request_check (c, cookie_gc);
  if (error) {
    fprintf (stderr, "ERROR: can't create gc : %d\n", error->error_code);
    xcb_disconnect (c);
    exit (-1);
  }

  cookie_font = xcb_close_font_checked (c, font);
  error = xcb_request_check (c, cookie_font);
  if (error) {
    fprintf (stderr, "ERROR: can't close font : %d\n", error->error_code);
    xcb_disconnect (c);
    exit (-1);
  }

  return gc;
}

int
randr_init(randr_state_t *state)
{
	/* Initialize state. */
	state->screen_num = -1;
	state->crtc_num = NULL;

	state->crtc_num_count = 0;
	state->crtc_count = 0;
	state->crtcs = NULL;

	state->preserve = 0;

	xcb_generic_error_t *error;

	/* Open X server connection */
	state->conn = xcb_connect(NULL, &state->preferred_screen);

	/* Query RandR version */
	xcb_randr_query_version_cookie_t ver_cookie =
		xcb_randr_query_version(state->conn, RANDR_VERSION_MAJOR,
					RANDR_VERSION_MINOR);
	xcb_randr_query_version_reply_t *ver_reply =
		xcb_randr_query_version_reply(state->conn, ver_cookie, &error);

	/* TODO What does it mean when both error and ver_reply is NULL?
	   Apparently, we have to check both to avoid seg faults. */
	if (error || ver_reply == NULL) {
		int ec = (error != 0) ? error->error_code : -1;
		fprintf(stderr, _("`%s' returned error %d\n"),
			"RANDR Query Version", ec);
		xcb_disconnect(state->conn);
		return -1;
	}

	if (ver_reply->major_version != RANDR_VERSION_MAJOR ||
	    ver_reply->minor_version < RANDR_VERSION_MINOR) {
		fprintf(stderr, _("Unsupported RANDR version (%u.%u)\n"),
			ver_reply->major_version, ver_reply->minor_version);
		free(ver_reply);
		xcb_disconnect(state->conn);
		return -1;
	}

	free(ver_reply);

	return 0;
}

int
XCloseDisplay (
	register Display *dpy)
{
	register _XExtension *ext;
	register int i;

	if (!(dpy->flags & XlibDisplayClosing))
	{
	    dpy->flags |= XlibDisplayClosing;
	    for (i = 0; i < dpy->nscreens; i++) {
		    register Screen *sp = &dpy->screens[i];
		    XFreeGC (dpy, sp->default_gc);
	    }
	    if (dpy->cursor_font != None) {
		XUnloadFont (dpy, dpy->cursor_font);
	    }
	    XSync(dpy, 1);  /* throw away pending events, catch errors */
	    /* call out to any extensions interested */
	    for (ext = dpy->ext_procs; ext; ext = ext->next) {
		if (ext->close_display)
		    (*ext->close_display)(dpy, &ext->codes);
	    }
	    /* if the closes generated more protocol, sync them up */
	    if (dpy->request != dpy->last_request_read)
		XSync(dpy, 1);
	}
	xcb_disconnect(dpy->xcb->connection);
	_XFreeDisplayStructure (dpy);
	return 0;
}

/**
 * Stop the capture
 */
static void xshm_capture_stop(struct xshm_data *data)
{
	obs_enter_graphics();

	if (data->texture) {
		gs_texture_destroy(data->texture);
		data->texture = NULL;
	}
	if (data->cursor) {
		xcb_xcursor_destroy(data->cursor);
		data->cursor = NULL;
	}

	obs_leave_graphics();

	if (data->xshm) {
		xshm_xcb_detach(data->xshm);
		data->xshm = NULL;
	}

	if (data->xcb) {
		xcb_disconnect(data->xcb);
		data->xcb = NULL;
	}

	if (data->server) {
		bfree(data->server);
		data->server = NULL;
	}
}

void DisplayVkXcb::terminate()
{
    ASSERT(mXcbConnection != nullptr);
    xcb_disconnect(mXcbConnection);
    mXcbConnection = nullptr;
    DisplayVk::terminate();
}

/** Perform cleanup on normal exit */
static void
exit_cleanup(void)
{
  debug("Cleaning resources up");

  /* Destroy CM window, thus giving up _NET_WM_CM_Sn ownership */
  if(globalconf.cm_window != XCB_NONE)
    xcb_destroy_window(globalconf.connection, globalconf.cm_window);

  /* Free resources related to the plugins */
  plugin_unload_all();

  /* Destroy the  linked-list of  windows which has  to be  done after
     unloading the plugins as the  plugins may use the windows list to
     free memory */
  window_list_cleanup();

  /* Free resources related  to the rendering backend which  has to be
     done  after the  windows  list  cleanup as  the  latter free  the
     rendering information associated with each window */
  rendering_unload();

  /* Free resources related to the keymaps */
  xcb_key_symbols_free(globalconf.keysyms);

  /* Free resources related to EWMH */
  xcb_ewmh_connection_wipe(&globalconf.ewmh);

  cfg_free(globalconf.cfg);
  free(globalconf.rendering_dir);
  free(globalconf.plugins_dir);

  xcb_disconnect(globalconf.connection);
}

void v_window::_deInitOSWindow() {
    xcb_destroy_window(_xcb_connection,_xcb_window);
    xcb_disconnect(_xcb_connection);

    _xcb_connection = nullptr;
    _xcb_window = 0;
}

void init(void)
{
    int scrno;
    xcb_screen_iterator_t iter;
    
    conn = xcb_connect(NULL, &scrno);
    if (!conn)
    {
        fprintf(stderr, "can't connect to an X server\n");
        exit(1);
    }

    iter = xcb_setup_roots_iterator(xcb_get_setup(conn));

    for (int i = 0; i < scrno; ++i)
    {
        xcb_screen_next(&iter);
    }

    screen = iter.data;

    if (!screen)
    {
        fprintf(stderr, "can't get the current screen\n");
        xcb_disconnect(conn);
        exit(1);
    }
}

int main(void)
{

  xcb_connection_t    *conn;
  xcb_screen_t        *screen;
  xcb_window_t         win;
  xcb_gcontext_t       gcontext;
  xcb_generic_event_t *event;
  uint32_t             mask;
  uint32_t             values[2];
  
                        /* open connection with the server */
  conn = xcb_connect(NULL,NULL);
  if (xcb_connection_has_error(conn)) {
    printf("Cannot open display\n");
    exit(1);
  }
                        /* get the first screen */
  screen = xcb_setup_roots_iterator( xcb_get_setup(conn) ).data;
 
                       /* create black graphics gcontext */
  gcontext = xcb_generate_id(conn);
  win = screen->root;
  mask = XCB_GC_FOREGROUND | XCB_GC_GRAPHICS_EXPOSURES;
  values[0] = screen->black_pixel;
  values[1] = 0;
  xcb_create_gc(conn, gcontext, win, mask, values);
 
                       /* create window */
  win = xcb_generate_id(conn);
  mask = XCB_CW_BACK_PIXEL | XCB_CW_EVENT_MASK;
  values[0] = screen->white_pixel;
  values[1] = XCB_EVENT_MASK_EXPOSURE 
              | XCB_EVENT_MASK_KEY_PRESS
              | XCB_EVENT_MASK_KEY_RELEASE;
  xcb_create_window(conn, screen->root_depth, win, screen->root,
                    10, 10, 100, 100, 1,
                    XCB_WINDOW_CLASS_INPUT_OUTPUT, screen->root_visual,
                    mask, values);
 
                        /* map (show) the window */
  xcb_map_window(conn, win);
 
  xcb_flush(conn);

  cterm_add_event_listener(XCB_KEY_PRESS, output_string);
  cterm_add_event_listener(XCB_KEY_PRESS, close_window);
 
                        /* event loop */
  while (!done) {
    event = xcb_poll_for_event(conn);
    if(event == NULL) continue;
    cterm_handle_event(event);
    free(event);
  }
                        /* close connection to server */
  xcb_disconnect(conn);
  cterm_free_event_handlers();
  return 0;
}

/** Call before exiting.
 */
void
awesome_atexit(bool restart)
{
    int screen_nbr, nscreens;

    if(globalconf.hooks.exit != LUA_REFNIL)
        luaA_dofunction_from_registry(globalconf.L, globalconf.hooks.exit, 0, 0);

    lua_pushboolean(globalconf.L, restart);
    signal_object_emit(globalconf.L, &global_signals, "exit", 1);

    a_dbus_cleanup();

    /* do this only for real screen */
    const xcb_setup_t *setup = xcb_get_setup(globalconf.connection);
    nscreens = setup ? xcb_setup_roots_length(setup) : -1;
    for(screen_nbr = 0;
        screen_nbr < nscreens;
        screen_nbr++)
        systray_cleanup(0, screen_nbr); //FIXME: Clean physical screens

    /* Close Lua */
    lua_close(globalconf.L);

    xcb_flush(globalconf.connection);

    /* Disconnect *after* closing lua */
    xcb_disconnect(globalconf.connection);

    ev_default_destroy();
}