72882f6aba
KWin requires the xcb plugin otherwise KWin crashes when the first xcb/xlib code is called. First KWin tries to set the QT_QPA_PLATFORM to "xcb", but that doesn't protect against the command line switch. Thus KWin also verifies that after constructing the QGuiApplication the platform name is set to xcb, if not it exits gracefully with a useful error message instead a crash. To make that work the KWinSelectionOwner has to be changed to a pointer and be delayed constructed, otherwise the crash already happens in the KSelectionOwner. Furthermore a small sanity check on the plugin is performed by checking whether KWin can get the XDisplay from the QPA. If not it means that the QPA plugin was compiled with -no-xcb-xlib which KWin doesn't support, it still uses XLib at various places. If KWin doesn't get the Display, it exits gracefully with a clear error message. CCBUG: 331880 REVIEW: 116669
120 lines
3.3 KiB
C++
120 lines
3.3 KiB
C++
/********************************************************************
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KWin - the KDE window manager
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This file is part of the KDE project.
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Copyright (C) 1999, 2000 Matthias Ettrich <ettrich@kde.org>
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Copyright (C) 2003 Lubos Lunak <l.lunak@kde.org>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*********************************************************************/
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#ifndef MAIN_H
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#define MAIN_H
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#include <KDE/KSelectionWatcher>
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// Qt
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#include <QApplication>
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#include <QAbstractNativeEventFilter>
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namespace KWin
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{
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class XcbEventFilter : public QAbstractNativeEventFilter
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{
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public:
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virtual bool nativeEventFilter(const QByteArray &eventType, void *message, long int *result) override;
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};
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class KWinSelectionOwner
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: public KSelectionOwner
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{
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Q_OBJECT
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public:
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explicit KWinSelectionOwner(int screen);
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protected:
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virtual bool genericReply(xcb_atom_t target, xcb_atom_t property, xcb_window_t requestor);
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virtual void replyTargets(xcb_atom_t property, xcb_window_t requestor);
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virtual void getAtoms();
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private:
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xcb_atom_t make_selection_atom(int screen);
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static xcb_atom_t xa_version;
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};
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class Application : public QApplication
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{
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Q_OBJECT
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public:
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/**
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* @brief This enum provides the various operation modes of KWin depending on the available
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* Windowing Systems at startup. For example whether KWin only talks to X11 or also to a Wayland
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* Compositor.
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*
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*/
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enum OperationMode {
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/**
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* @brief KWin uses only X11 for managing windows and compositing
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*/
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OperationModeX11,
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/**
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* @brief KWin uses X11 for managing windows, but renders to a Wayland compositor.
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* Input is received from the Wayland compositor.
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*/
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OperationModeWaylandAndX11
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};
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Application(int &argc, char **argv);
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~Application();
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void setReplace(bool replace);
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void setConfigLock(bool lock);
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void start();
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/**
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* @brief The operation mode used by KWin.
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*
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* @return OperationMode
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*/
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OperationMode operationMode() const;
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void setOperationMode(OperationMode mode);
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bool shouldUseWaylandForCompositing() const;
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bool requiresCompositing() const;
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static void setCrashCount(int count);
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static bool wasCrash();
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protected:
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bool notify(QObject* o, QEvent* e);
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static void crashHandler(int signal);
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private Q_SLOTS:
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void lostSelection();
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void resetCrashesCount();
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private:
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void crashChecking();
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QScopedPointer<KWinSelectionOwner> owner;
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QScopedPointer<XcbEventFilter> m_eventFilter;
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bool m_replace;
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bool m_configLock;
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OperationMode m_operationMode;
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static int crashes;
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};
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inline static Application *kwinApp()
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{
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return static_cast<Application*>(QCoreApplication::instance());
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}
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} // namespace
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#endif
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