void Compositor::registerCompositor(QWindow *w) { xcb_ewmh_set_wm_cm_owner(&ewmh_, QX11Info::appScreen(), w->winId(), QX11Info::getTimestamp(), 0, 0); auto wmCmCookie = xcb_ewmh_get_wm_cm_owner_unchecked(&ewmh_, QX11Info::appScreen()); xcb_window_t wmCmOwnerWin = XCB_NONE; if (!xcb_ewmh_get_wm_cm_owner_reply(&ewmh_, wmCmCookie, &wmCmOwnerWin, Q_NULLPTR)) { qFatal("Cannot check _NET_WM_CM_Sn"); } if (wmCmOwnerWin != w->winId()) { qFatal("Another compositing manager is already running"); } }
/** Handler for PropertyNotify event meaningful to set the timestamp * (given in the PropertyNotify event field) when acquiring the * ownership of _NET_WM_CM_Sn using SetOwner request (as specified in * ICCCM and EWMH) * * \see display_register_cm * \param event The X PropertyNotify event */ void display_event_set_owner_property(xcb_property_notify_event_t *event) { debug("Set _NET_WM_CM_Sn ownership"); /* Set ownership on _NET_WM_CM_Sn giving the Compositing Manager window */ xcb_ewmh_set_wm_cm_owner(&globalconf.ewmh, globalconf.screen_nbr, globalconf.cm_window, event->time, 0, 0); /* Send request to check whether the ownership succeeded */ _get_wm_cm_owner_cookie = xcb_ewmh_get_wm_cm_owner_unchecked(&globalconf.ewmh, globalconf.screen_nbr); }
Compositor::Compositor() : connection_(QX11Info::connection()), root_(QX11Info::appRootWindow()), damageExt_(xcb_get_extension_data(connection_, &xcb_damage_id)), initFinished_(false) { qRegisterMetaType<ClientWindow *>(); Q_ASSERT(QCoreApplication::instance()); QCoreApplication::instance()->installNativeEventFilter(this); auto ewmhCookie = xcb_ewmh_init_atoms(connection_, &ewmh_); if (!xcb_ewmh_init_atoms_replies(&ewmh_, ewmhCookie, Q_NULLPTR)) { qFatal("Cannot init EWMH"); } auto wmCmCookie = xcb_ewmh_get_wm_cm_owner_unchecked(&ewmh_, QX11Info::appScreen()); xcb_window_t wmCmOwnerWin = XCB_NONE; if (!xcb_ewmh_get_wm_cm_owner_reply(&ewmh_, wmCmCookie, &wmCmOwnerWin, Q_NULLPTR)) { qFatal("Cannot check _NET_WM_CM_Sn"); } if (wmCmOwnerWin) { qFatal("Another compositing manager is already running"); } auto attributesCookie = xcb_get_window_attributes_unchecked(connection_, root_); auto damageQueryVersionCookie = xcb_damage_query_version_unchecked(connection_, 1, 1); auto overlayWindowCookie = xcb_composite_get_overlay_window_unchecked(connection_, root_); auto attributes = xcbReply(xcb_get_window_attributes_reply(connection_, attributesCookie, Q_NULLPTR)); if (!attributes) { qFatal("Cannot get root window attributes"); } auto newEventMask = attributes->your_event_mask | XCB_EVENT_MASK_SUBSTRUCTURE_NOTIFY | XCB_EVENT_MASK_STRUCTURE_NOTIFY | XCB_EVENT_MASK_PROPERTY_CHANGE; xcb_change_window_attributes(connection_, root_, XCB_CW_EVENT_MASK, &newEventMask); auto treeCookie = xcb_query_tree_unchecked(connection_, root_); auto rootGeometryCookie = xcb_get_geometry_unchecked(connection_, root_); auto damageVersion = xcbReply(xcb_damage_query_version_reply(connection_, damageQueryVersionCookie, Q_NULLPTR)); if (!damageVersion) { qFatal("Cannot query version of Damage extension"); } auto overlayWindow = xcbReply(xcb_composite_get_overlay_window_reply(connection_, overlayWindowCookie, Q_NULLPTR)); if (!overlayWindow) { qFatal("Cannot get overlay window"); } overlayWindow_.reset(QWindow::fromWinId(overlayWindow->overlay_win)); auto region = xcb_generate_id(connection_); xcb_xfixes_create_region(connection_, region, 0, Q_NULLPTR); xcb_xfixes_set_window_shape_region(connection_, overlayWindow->overlay_win, XCB_SHAPE_SK_INPUT, 0, 0, region); xcb_xfixes_destroy_region(connection_, region); xcb_composite_redirect_subwindows(connection_, root_, XCB_COMPOSITE_REDIRECT_MANUAL); auto rootGeometry = xcbReply(xcb_get_geometry_reply(connection_, rootGeometryCookie, Q_NULLPTR)); if (!rootGeometry) { qFatal("Cannot query root window geometry"); } rootGeometry_ = QRect(rootGeometry->x, rootGeometry->y, rootGeometry->width, rootGeometry->height); auto tree = xcbReply(xcb_query_tree_reply(connection_, treeCookie, Q_NULLPTR)); if (!tree) { qFatal("Cannot query window tree"); } auto children = xcb_query_tree_children(tree.get()); for (int i = 0; i < xcb_query_tree_children_length(tree.get()); i++) { addChildWindow(children[i]); } updateActiveWindow(); initFinished_ = true; }