kwin/main_wayland.cpp

/********************************************************************
 KWin - the KDE window manager
 This file is part of the KDE project.

Copyright (C) 2014 Martin Gräßlin <mgraesslin@kde.org>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program 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 General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
*********************************************************************/
#include "main_wayland.h"
#include <config-kwin.h>
// kwin
#include "wayland_backend.h"
#include "xcbutils.h"

// KDE
#include <KLocalizedString>
// Qt
#include <qplatformdefs.h>
#include <QCommandLineParser>

// system
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif // HAVE_UNISTD_H

namespace KWin
{

//************************************
// ApplicationWayland
//************************************

ApplicationWayland::ApplicationWayland(int &argc, char **argv)
    : Application(OperationModeWaylandAndX11, argc, argv)
{
}

ApplicationWayland::~ApplicationWayland()
{
    destroyWorkspace();
    delete Wayland::WaylandBackend::self();
    // TODO: only if we support X11
    Xcb::setInputFocus(XCB_INPUT_FOCUS_POINTER_ROOT);
}

void ApplicationWayland::performStartup()
{
    // we don't support X11 multi-head in Wayland
    Application::setX11ScreenNumber(0);

    // we need to do an XSync here, otherwise the QPA might crash us later on
    // TODO: remove
    Xcb::sync();

    createAtoms();

    setupEventFilters();
    // first load options - done internally by a different thread
    createOptions();

    // Check  whether another windowmanager is running
    const uint32_t maskValues[] = {XCB_EVENT_MASK_SUBSTRUCTURE_REDIRECT};
    ScopedCPointer<xcb_generic_error_t> redirectCheck(xcb_request_check(connection(),
                                                                        xcb_change_window_attributes_checked(connection(),
                                                                                                                rootWindow(),
                                                                                                                XCB_CW_EVENT_MASK,
                                                                                                                maskValues)));
    if (!redirectCheck.isNull()) {
        fputs(i18n("kwin_wayland: an X11 window manager is running on the X11 Display.\n").toLocal8Bit().constData(), stderr);
        ::exit(1);
    }

    // try creating the Wayland Backend
    Wayland::WaylandBackend *backend = Wayland::WaylandBackend::create();
    if (!backend) {
        fputs(i18n("kwin_wayland: could not connect to Wayland Server, ensure WAYLAND_DISPLAY is set.\n").toLocal8Bit().constData(), stderr);
        ::exit(1);
    }

    createWorkspace();

    Xcb::sync(); // Trigger possible errors, there's still a chance to abort

    notifyKSplash();
}

} // namespace

extern "C"
KWIN_EXPORT int kdemain(int argc, char * argv[])
{
    KWin::Application::setupMalloc();
    KWin::Application::setupLocalizedString();
    KWin::Application::setupLoggingCategoryFilters();

    // TODO: check whether we have a wayland connection

    // Disable the glib event loop integration, since it seems to be responsible
    // for several bug reports about high CPU usage (bug #239963)
    setenv("QT_NO_GLIB", "1", true);

    // enforce xcb plugin, unfortunately command line switch has precedence
    // TODO: ensure it's not xcb once we support the Wayland QPA
    setenv("QT_QPA_PLATFORM", "xcb", true);

    KWin::ApplicationWayland a(argc, argv);
    a.setupTranslator();

    KWin::Application::createAboutData();

    QCommandLineParser parser;
    a.setupCommandLine(&parser);

    parser.process(a);
    a.processCommandLine(&parser);

    // perform sanity checks
    // TODO: remove those two
    if (a.platformName().toLower() != QStringLiteral("xcb")) {
        fprintf(stderr, "%s: FATAL ERROR expecting platform xcb but got platform %s\n",
                argv[0], qPrintable(a.platformName()));
        exit(1);
    }
    if (!KWin::display()) {
        fprintf(stderr, "%s: FATAL ERROR KWin requires Xlib support in the xcb plugin. Do not configure Qt with -no-xcb-xlib\n",
                argv[0]);
        exit(1);
    }

    a.start();

    // TODO: is this still needed?
    a.registerDBusService();

    return a.exec();
}