path: root/src/plugins/platforms/xcb/qxcbwindow.cpp

/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
**
** This file is part of the plugins of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
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** appearing in the file LICENSE.LGPL included in the packaging of this
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** General Public License version 2.1 requirements will be met:
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** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
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** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
** Public License version 3.0 requirements will be met:
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** $QT_END_LICENSE$
**
****************************************************************************/

#include "qxcbwindow.h"

#include <QtDebug>
#include <QScreen>

#include "qxcbconnection.h"
#include "qxcbscreen.h"
#include "qxcbdrag.h"
#include "qxcbkeyboard.h"
#include "qxcbwmsupport.h"

#include <qplatformintegration_qpa.h>

#ifdef XCB_USE_DRI2
#include "qdri2context.h"
#endif

// FIXME This workaround can be removed for xcb-icccm > 3.8
#define class class_name
#include <xcb/xcb_icccm.h>
#undef class
#include <xcb/xfixes.h>

// xcb-icccm 3.8 support
#ifdef XCB_ICCCM_NUM_WM_SIZE_HINTS_ELEMENTS
#define xcb_get_wm_hints_reply xcb_icccm_get_wm_hints_reply
#define xcb_get_wm_hints xcb_icccm_get_wm_hints
#define xcb_get_wm_hints_unchecked xcb_icccm_get_wm_hints_unchecked
#define xcb_set_wm_hints xcb_icccm_set_wm_hints
#define xcb_set_wm_normal_hints xcb_icccm_set_wm_normal_hints
#define xcb_size_hints_set_base_size xcb_icccm_size_hints_set_base_size
#define xcb_size_hints_set_max_size xcb_icccm_size_hints_set_max_size
#define xcb_size_hints_set_min_size xcb_icccm_size_hints_set_min_size
#define xcb_size_hints_set_position xcb_icccm_size_hints_set_position
#define xcb_size_hints_set_resize_inc xcb_icccm_size_hints_set_resize_inc
#define xcb_size_hints_set_size xcb_icccm_size_hints_set_size
#define xcb_size_hints_set_win_gravity xcb_icccm_size_hints_set_win_gravity
#define xcb_wm_hints_set_iconic xcb_icccm_wm_hints_set_iconic
#define xcb_wm_hints_set_normal xcb_icccm_wm_hints_set_normal
#define xcb_wm_hints_set_input xcb_icccm_wm_hints_set_input
#define xcb_wm_hints_t xcb_icccm_wm_hints_t
#define XCB_WM_STATE_ICONIC XCB_ICCCM_WM_STATE_ICONIC
#define XCB_WM_STATE_WITHDRAWN XCB_ICCCM_WM_STATE_WITHDRAWN
#endif

#include <private/qguiapplication_p.h>
#include <private/qwindow_p.h>

#include <QtGui/QPlatformBackingStore>
#include <QtGui/QWindowSystemInterface>

#include <stdio.h>

#ifdef XCB_USE_XLIB
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#endif

#ifdef XCB_USE_XINPUT2_MAEMO
#include <X11/extensions/XInput2.h>
#endif

#if defined(XCB_USE_GLX)
#include "qglxintegration.h"
#include <QtPlatformSupport/private/qglxconvenience_p.h>
#elif defined(XCB_USE_EGL)
#include "qxcbeglsurface.h"
#include <QtPlatformSupport/private/qeglconvenience_p.h>
#include <QtPlatformSupport/private/qxlibeglintegration_p.h>
#endif

#define XCOORD_MAX 16383

//#ifdef NET_WM_STATE_DEBUG

QT_BEGIN_NAMESPACE

// Returns true if we should set WM_TRANSIENT_FOR on \a w
static inline bool isTransient(const QWindow *w)
{
    return w->windowType() == Qt::Dialog
           || w->windowType() == Qt::Sheet
           || w->windowType() == Qt::Tool
           || w->windowType() == Qt::SplashScreen
           || w->windowType() == Qt::ToolTip
           || w->windowType() == Qt::Drawer
           || w->windowType() == Qt::Popup;
}

static inline QImage::Format imageFormatForDepth(int depth)
{
    switch (depth) {
        case 32: return QImage::Format_ARGB32_Premultiplied;
        case 24: return QImage::Format_RGB32;
        case 16: return QImage::Format_RGB16;
        default: return QImage::Format_Invalid;
    }
}

QXcbWindow::QXcbWindow(QWindow *window)
    : QPlatformWindow(window)
    , m_window(0)
    , m_syncCounter(0)
    , m_mapped(false)
    , m_transparent(false)
    , m_deferredActivation(false)
    , m_netWmUserTimeWindow(XCB_NONE)
#if defined(XCB_USE_EGL)
    , m_eglSurface(0)
#endif
    , m_lastWindowStateEvent(-1)
{
    m_screen = static_cast<QXcbScreen *>(window->screen()->handle());

    setConnection(m_screen->connection());

    create();
}

void QXcbWindow::create()
{
    destroy();

    m_deferredExpose = false;
    m_configureNotifyPending = true;
    m_windowState = Qt::WindowNoState;

    Qt::WindowType type = window()->windowType();

    if (type == Qt::Desktop) {
        m_window = m_screen->root();
        m_depth = m_screen->screen()->root_depth;
        m_imageFormat = imageFormatForDepth(m_depth);
        connection()->addWindow(m_window, this);
        return;
    }

    const quint32 mask = XCB_CW_BACK_PIXMAP | XCB_CW_OVERRIDE_REDIRECT | XCB_CW_SAVE_UNDER | XCB_CW_EVENT_MASK;
    const quint32 values[] = {
        // XCB_CW_BACK_PIXMAP
        XCB_NONE,
        // XCB_CW_OVERRIDE_REDIRECT
        type == Qt::Popup || type == Qt::ToolTip,
        // XCB_CW_SAVE_UNDER
        type == Qt::Popup || type == Qt::Tool || type == Qt::SplashScreen || type == Qt::ToolTip || type == Qt::Drawer,
        // XCB_CW_EVENT_MASK
        XCB_EVENT_MASK_EXPOSURE
        | XCB_EVENT_MASK_STRUCTURE_NOTIFY
        | XCB_EVENT_MASK_KEY_PRESS
        | XCB_EVENT_MASK_KEY_RELEASE
        | XCB_EVENT_MASK_BUTTON_PRESS
        | XCB_EVENT_MASK_BUTTON_RELEASE
        | XCB_EVENT_MASK_BUTTON_MOTION
        | XCB_EVENT_MASK_ENTER_WINDOW
        | XCB_EVENT_MASK_LEAVE_WINDOW
        | XCB_EVENT_MASK_POINTER_MOTION
        | XCB_EVENT_MASK_PROPERTY_CHANGE
        | XCB_EVENT_MASK_FOCUS_CHANGE
    };

    QRect rect = window()->geometry();
    QPlatformWindow::setGeometry(rect);

    rect.setWidth(qBound(1, rect.width(), XCOORD_MAX));
    rect.setHeight(qBound(1, rect.height(), XCOORD_MAX));

    xcb_window_t xcb_parent_id = m_screen->root();
    if (parent())
        xcb_parent_id = static_cast<QXcbWindow *>(parent())->xcb_window();

    m_format = window()->requestedFormat();

#if (defined(XCB_USE_GLX) || defined(XCB_USE_EGL)) && defined(XCB_USE_XLIB)
    if (QGuiApplicationPrivate::platformIntegration()->hasCapability(QPlatformIntegration::OpenGL)
        || m_format.hasAlpha())
    {
#if defined(XCB_USE_GLX)
        XVisualInfo *visualInfo = qglx_findVisualInfo(DISPLAY_FROM_XCB(m_screen), m_screen->screenNumber(), &m_format);
        if (!visualInfo)
            qFatal("Could not initialize GLX");
#elif defined(XCB_USE_EGL)
        EGLDisplay eglDisplay = connection()->egl_display();
        EGLConfig eglConfig = q_configFromGLFormat(eglDisplay, m_format, true);
        m_format = q_glFormatFromConfig(eglDisplay, eglConfig);

        VisualID id = QXlibEglIntegration::getCompatibleVisualId(DISPLAY_FROM_XCB(this), eglDisplay, eglConfig);

        XVisualInfo visualInfoTemplate;
        memset(&visualInfoTemplate, 0, sizeof(XVisualInfo));
        visualInfoTemplate.visualid = id;

        XVisualInfo *visualInfo;
        int matchingCount = 0;
        visualInfo = XGetVisualInfo(DISPLAY_FROM_XCB(this), VisualIDMask, &visualInfoTemplate, &matchingCount);
        if (!visualInfo)
            qFatal("Could not initialize EGL");
#endif //XCB_USE_GLX
        m_depth = visualInfo->depth;
        m_imageFormat = imageFormatForDepth(m_depth);
        Colormap cmap = XCreateColormap(DISPLAY_FROM_XCB(this), xcb_parent_id, visualInfo->visual, AllocNone);

        XSetWindowAttributes a;
        a.background_pixel = WhitePixel(DISPLAY_FROM_XCB(this), m_screen->screenNumber());
        a.border_pixel = BlackPixel(DISPLAY_FROM_XCB(this), m_screen->screenNumber());
        a.colormap = cmap;

        m_visualId = visualInfo->visualid;

        m_window = XCreateWindow(DISPLAY_FROM_XCB(this), xcb_parent_id, rect.x(), rect.y(), rect.width(), rect.height(),
                                  0, visualInfo->depth, InputOutput, visualInfo->visual,
                                  CWBackPixel|CWBorderPixel|CWColormap, &a);

        XFree(visualInfo);
    } else
#endif //defined(XCB_USE_GLX) || defined(XCB_USE_EGL)
    {
        m_window = xcb_generate_id(xcb_connection());
        m_depth = m_screen->screen()->root_depth;
        m_imageFormat = imageFormatForDepth(m_depth);
        m_visualId = m_screen->screen()->root_visual;

        Q_XCB_CALL(xcb_create_window(xcb_connection(),
                                     XCB_COPY_FROM_PARENT,            // depth -- same as root
                                     m_window,                        // window id
                                     xcb_parent_id,                   // parent window id
                                     rect.x(),
                                     rect.y(),
                                     rect.width(),
                                     rect.height(),
                                     0,                               // border width
                                     XCB_WINDOW_CLASS_INPUT_OUTPUT,   // window class
                                     m_visualId,                      // visual
                                     0,                               // value mask
                                     0));                             // value list
    }

    connection()->addWindow(m_window, this);

    Q_XCB_CALL(xcb_change_window_attributes(xcb_connection(), m_window, mask, values));

    propagateSizeHints();

    xcb_atom_t properties[4];
    int propertyCount = 0;
    properties[propertyCount++] = atom(QXcbAtom::WM_DELETE_WINDOW);
    properties[propertyCount++] = atom(QXcbAtom::WM_TAKE_FOCUS);
    properties[propertyCount++] = atom(QXcbAtom::_NET_WM_PING);

    if (m_screen->syncRequestSupported())
        properties[propertyCount++] = atom(QXcbAtom::_NET_WM_SYNC_REQUEST);

    if (window()->windowFlags() & Qt::WindowContextHelpButtonHint)
        properties[propertyCount++] = atom(QXcbAtom::_NET_WM_CONTEXT_HELP);

    Q_XCB_CALL(xcb_change_property(xcb_connection(),
                                   XCB_PROP_MODE_REPLACE,
                                   m_window,
                                   atom(QXcbAtom::WM_PROTOCOLS),
                                   XCB_ATOM_ATOM,
                                   32,
                                   propertyCount,
                                   properties));
    m_syncValue.hi = 0;
    m_syncValue.lo = 0;

    if (m_screen->syncRequestSupported()) {
        m_syncCounter = xcb_generate_id(xcb_connection());
        Q_XCB_CALL(xcb_sync_create_counter(xcb_connection(), m_syncCounter, m_syncValue));

        Q_XCB_CALL(xcb_change_property(xcb_connection(),
                                       XCB_PROP_MODE_REPLACE,
                                       m_window,
                                       atom(QXcbAtom::_NET_WM_SYNC_REQUEST_COUNTER),
                                       XCB_ATOM_CARDINAL,
                                       32,
                                       1,
                                       &m_syncCounter));
    }

    // set the PID to let the WM kill the application if unresponsive
    long pid = getpid();
    Q_XCB_CALL(xcb_change_property(xcb_connection(), XCB_PROP_MODE_REPLACE, m_window,
                                   atom(QXcbAtom::_NET_WM_PID), XCB_ATOM_CARDINAL, 32,
                                   1, &pid));

    xcb_wm_hints_t hints;
    memset(&hints, 0, sizeof(hints));
    xcb_wm_hints_set_normal(&hints);

    xcb_wm_hints_set_input(&hints, !(window()->windowFlags() & Qt::WindowDoesNotAcceptFocus));

    xcb_set_wm_hints(xcb_connection(), m_window, &hints);

    xcb_window_t leader = m_screen->clientLeader();
    Q_XCB_CALL(xcb_change_property(xcb_connection(), XCB_PROP_MODE_REPLACE, m_window,
                                   atom(QXcbAtom::WM_CLIENT_LEADER), XCB_ATOM_WINDOW, 32,
                                   1, &leader));

#ifdef XCB_USE_XINPUT2_MAEMO
    if (connection()->isUsingXInput2()) {
        XIEventMask xieventmask;
        uchar bitmask[2] = { 0, 0 };

        xieventmask.deviceid = XIAllMasterDevices;
        xieventmask.mask = bitmask;
        xieventmask.mask_len = sizeof(bitmask);

        XISetMask(bitmask, XI_ButtonPress);
        XISetMask(bitmask, XI_ButtonRelease);
        XISetMask(bitmask, XI_Motion);

        XISelectEvents(DISPLAY_FROM_XCB(this), m_window, &xieventmask, 1);
    }
#endif

    setWindowFlags(window()->windowFlags());
    setWindowTitle(window()->windowTitle());
    setWindowState(window()->windowState());

    if (window()->windowFlags() & Qt::WindowTransparentForInput)
        setTransparentForMouseEvents(true);

    connection()->drag()->dndEnable(this, true);
}

QXcbWindow::~QXcbWindow()
{
    destroy();
}

void QXcbWindow::destroy()
{
    if (m_syncCounter && m_screen->syncRequestSupported())
        Q_XCB_CALL(xcb_sync_destroy_counter(xcb_connection(), m_syncCounter));
    if (m_window) {
        if (m_netWmUserTimeWindow) {
            xcb_delete_property(xcb_connection(), m_window, atom(QXcbAtom::_NET_WM_USER_TIME_WINDOW));
            // Some window managers, like metacity, do XSelectInput on the _NET_WM_USER_TIME_WINDOW window,
            // without trapping BadWindow (which crashes when the user time window is destroyed).
            connection()->sync();
            xcb_destroy_window(xcb_connection(), m_netWmUserTimeWindow);
            m_netWmUserTimeWindow = XCB_NONE;
        }
        connection()->removeWindow(m_window);
        Q_XCB_CALL(xcb_destroy_window(xcb_connection(), m_window));
    }
    m_mapped = false;

#if defined(XCB_USE_EGL)
    delete m_eglSurface;
    m_eglSurface = 0;
#endif
}

void QXcbWindow::setGeometry(const QRect &rect)
{
    QPlatformWindow::setGeometry(rect);

    propagateSizeHints();

    const quint32 mask = XCB_CONFIG_WINDOW_X | XCB_CONFIG_WINDOW_Y | XCB_CONFIG_WINDOW_WIDTH | XCB_CONFIG_WINDOW_HEIGHT;
    const qint32 values[] = {
        qBound<qint32>(-XCOORD_MAX, rect.x(),      XCOORD_MAX),
        qBound<qint32>(-XCOORD_MAX, rect.y(),      XCOORD_MAX),
        qBound<qint32>(1,           rect.width(),  XCOORD_MAX),
        qBound<qint32>(1,           rect.height(), XCOORD_MAX),
    };

    Q_XCB_CALL(xcb_configure_window(xcb_connection(), m_window, mask, reinterpret_cast<const quint32*>(values)));

    xcb_flush(xcb_connection());
}

QMargins QXcbWindow::frameMargins() const
{
    if (m_dirtyFrameMargins) {
        xcb_window_t window = m_window;
        xcb_window_t parent = m_window;

        bool foundRoot = false;

        const QVector<xcb_window_t> &virtualRoots =
            connection()->wmSupport()->virtualRoots();

        while (!foundRoot) {
            xcb_query_tree_cookie_t cookie = xcb_query_tree_unchecked(xcb_connection(), parent);

            xcb_query_tree_reply_t *reply = xcb_query_tree_reply(xcb_connection(), cookie, NULL);
            if (reply) {
                if (reply->root == reply->parent || virtualRoots.indexOf(reply->parent) != -1) {
                    foundRoot = true;
                } else {
                    window = parent;
                    parent = reply->parent;
                }

                free(reply);
            } else {
                m_dirtyFrameMargins = false;
                m_frameMargins = QMargins();
                return m_frameMargins;
            }
        }

        QPoint offset;

        xcb_translate_coordinates_reply_t *reply =
            xcb_translate_coordinates_reply(
                xcb_connection(),
                xcb_translate_coordinates(xcb_connection(), window, parent, 0, 0),
                NULL);

        if (reply) {
            offset = QPoint(reply->dst_x, reply->dst_y);
            free(reply);
        }

        xcb_get_geometry_reply_t *geom =
            xcb_get_geometry_reply(
                xcb_connection(),
                xcb_get_geometry(xcb_connection(), parent),
                NULL);

        if (geom) {
            // --
            // add the border_width for the window managers frame... some window managers
            // do not use a border_width of zero for their frames, and if we the left and
            // top strut, we ensure that pos() is absolutely correct.  frameGeometry()
            // will still be incorrect though... perhaps i should have foffset as well, to
            // indicate the frame offset (equal to the border_width on X).
            // - Brad
            // -- copied from qwidget_x11.cpp

            int left = offset.x() + geom->border_width;
            int top = offset.y() + geom->border_width;
            int right = geom->width + geom->border_width - geometry().width() - offset.x();
            int bottom = geom->height + geom->border_width - geometry().height() - offset.y();

            m_frameMargins = QMargins(left, top, right, bottom);

            free(geom);
        }

        m_dirtyFrameMargins = false;
    }

    return m_frameMargins;
}

void QXcbWindow::setVisible(bool visible)
{
    if (visible)
        show();
    else
        hide();
}

void QXcbWindow::show()
{
    if (window()->isTopLevel()) {
        xcb_get_property_cookie_t cookie = xcb_get_wm_hints_unchecked(xcb_connection(), m_window);

        xcb_wm_hints_t hints;
        xcb_get_wm_hints_reply(xcb_connection(), cookie, &hints, NULL);

        if (window()->windowState() & Qt::WindowMinimized)
            xcb_wm_hints_set_iconic(&hints);
        else
            xcb_wm_hints_set_normal(&hints);

        xcb_wm_hints_set_input(&hints, !(window()->windowFlags() & Qt::WindowDoesNotAcceptFocus));

        xcb_set_wm_hints(xcb_connection(), m_window, &hints);

        // update WM_NORMAL_HINTS
        propagateSizeHints();

        // update WM_TRANSIENT_FOR
        if (window()->transientParent() && isTransient(window())) {
            QXcbWindow *transientXcbParent = static_cast<QXcbWindow *>(window()->transientParent()->handle());
            if (transientXcbParent) {
                // ICCCM 4.1.2.6
                xcb_window_t parentWindow = transientXcbParent->xcb_window();

                // todo: set transient for group (wm_client_leader) if no parent, a la qwidget_x11.cpp
                Q_XCB_CALL(xcb_change_property(xcb_connection(), XCB_PROP_MODE_REPLACE, m_window,
                                               XCB_ATOM_WM_TRANSIENT_FOR, XCB_ATOM_WINDOW, 32,
                                               1, &parentWindow));
            }
        }

        // update _MOTIF_WM_HINTS
        updateMotifWmHintsBeforeMap();

        // update _NET_WM_STATE
        updateNetWmStateBeforeMap();
    }

    if (connection()->time() != XCB_TIME_CURRENT_TIME)
        updateNetWmUserTime(connection()->time());

    Q_XCB_CALL(xcb_map_window(xcb_connection(), m_window));
    xcb_flush(xcb_connection());

    connection()->sync();
}

void QXcbWindow::hide()
{
    Q_XCB_CALL(xcb_unmap_window(xcb_connection(), m_window));

    // send synthetic UnmapNotify event according to icccm 4.1.4
    xcb_unmap_notify_event_t event;
    event.response_type = XCB_UNMAP_NOTIFY;
    event.event = m_screen->root();
    event.window = m_window;
    event.from_configure = false;
    Q_XCB_CALL(xcb_send_event(xcb_connection(), false, m_screen->root(),
                              XCB_EVENT_MASK_SUBSTRUCTURE_NOTIFY | XCB_EVENT_MASK_SUBSTRUCTURE_REDIRECT, (const char *)&event));

    xcb_flush(xcb_connection());

    m_mapped = false;
}

struct QtMotifWmHints {
    quint32 flags, functions, decorations;
    qint32 input_mode;
    quint32 status;
};

enum {
    MWM_HINTS_FUNCTIONS   = (1L << 0),

    MWM_FUNC_ALL      = (1L << 0),
    MWM_FUNC_RESIZE   = (1L << 1),
    MWM_FUNC_MOVE     = (1L << 2),
    MWM_FUNC_MINIMIZE = (1L << 3),
    MWM_FUNC_MAXIMIZE = (1L << 4),
    MWM_FUNC_CLOSE    = (1L << 5),

    MWM_HINTS_DECORATIONS = (1L << 1),

    MWM_DECOR_ALL      = (1L << 0),
    MWM_DECOR_BORDER   = (1L << 1),
    MWM_DECOR_RESIZEH  = (1L << 2),
    MWM_DECOR_TITLE    = (1L << 3),
    MWM_DECOR_MENU     = (1L << 4),
    MWM_DECOR_MINIMIZE = (1L << 5),
    MWM_DECOR_MAXIMIZE = (1L << 6),

    MWM_HINTS_INPUT_MODE = (1L << 2),

    MWM_INPUT_MODELESS                  = 0L,
    MWM_INPUT_PRIMARY_APPLICATION_MODAL = 1L,
    MWM_INPUT_FULL_APPLICATION_MODAL    = 3L
};

static QtMotifWmHints getMotifWmHints(QXcbConnection *c, xcb_window_t window)
{
    QtMotifWmHints hints;

    xcb_get_property_cookie_t get_cookie =
        xcb_get_property_unchecked(c->xcb_connection(), 0, window, c->atom(QXcbAtom::_MOTIF_WM_HINTS),
                         c->atom(QXcbAtom::_MOTIF_WM_HINTS), 0, 20);

    xcb_get_property_reply_t *reply =
        xcb_get_property_reply(c->xcb_connection(), get_cookie, NULL);

    if (reply && reply->format == 32 && reply->type == c->atom(QXcbAtom::_MOTIF_WM_HINTS)) {
        hints = *((QtMotifWmHints *)xcb_get_property_value(reply));
    } else {
        hints.flags = 0L;
        hints.functions = MWM_FUNC_ALL;
        hints.decorations = MWM_DECOR_ALL;
        hints.input_mode = 0L;
        hints.status = 0L;
    }

    free(reply);

    return hints;
}

static void setMotifWmHints(QXcbConnection *c, xcb_window_t window, const QtMotifWmHints &hints)
{
    if (hints.flags != 0l) {
        Q_XCB_CALL2(xcb_change_property(c->xcb_connection(),
                                       XCB_PROP_MODE_REPLACE,
                                       window,
                                       c->atom(QXcbAtom::_MOTIF_WM_HINTS),
                                       c->atom(QXcbAtom::_MOTIF_WM_HINTS),
                                       32,
                                       5,
                                       &hints), c);
    } else {
        Q_XCB_CALL2(xcb_delete_property(c->xcb_connection(), window, c->atom(QXcbAtom::_MOTIF_WM_HINTS)), c);
    }
}

QXcbWindow::NetWmStates QXcbWindow::netWmStates()
{
    NetWmStates result(0);

    xcb_get_property_cookie_t get_cookie =
        xcb_get_property_unchecked(xcb_connection(), 0, m_window, atom(QXcbAtom::_NET_WM_STATE),
                         XCB_ATOM_ATOM, 0, 1024);

    xcb_get_property_reply_t *reply =
        xcb_get_property_reply(xcb_connection(), get_cookie, NULL);

    if (reply && reply->format == 32 && reply->type == XCB_ATOM_ATOM) {
        const xcb_atom_t *states = static_cast<const xcb_atom_t *>(xcb_get_property_value(reply));
        const xcb_atom_t *statesEnd = states + reply->length;
        if (statesEnd != qFind(states, statesEnd, atom(QXcbAtom::_NET_WM_STATE_ABOVE)))
            result |= NetWmStateAbove;
        if (statesEnd != qFind(states, statesEnd, atom(QXcbAtom::_NET_WM_STATE_BELOW)))
            result |= NetWmStateBelow;
        if (statesEnd != qFind(states, statesEnd, atom(QXcbAtom::_NET_WM_STATE_FULLSCREEN)))
            result |= NetWmStateFullScreen;
        if (statesEnd != qFind(states, statesEnd, atom(QXcbAtom::_NET_WM_STATE_MAXIMIZED_HORZ)))
            result |= NetWmStateMaximizedHorz;
        if (statesEnd != qFind(states, statesEnd, atom(QXcbAtom::_NET_WM_STATE_MAXIMIZED_VERT)))
            result |= NetWmStateMaximizedVert;
        if (statesEnd != qFind(states, statesEnd, atom(QXcbAtom::_NET_WM_STATE_MODAL)))
            result |= NetWmStateModal;
        if (statesEnd != qFind(states, statesEnd, atom(QXcbAtom::_NET_WM_STATE_STAYS_ON_TOP)))
            result |= NetWmStateStaysOnTop;
        if (statesEnd != qFind(states, statesEnd, atom(QXcbAtom::_NET_WM_STATE_DEMANDS_ATTENTION)))
            result |= NetWmStateDemandsAttention;
        free(reply);
    } else {
#ifdef NET_WM_STATE_DEBUG
        printf("getting net wm state (%x), empty\n", m_window);
#endif
    }

    return result;
}

void QXcbWindow::setNetWmStates(NetWmStates states)
{
    QVector<xcb_atom_t> atoms;
    if (states & NetWmStateAbove)
        atoms.push_back(atom(QXcbAtom::_NET_WM_STATE_ABOVE));
    if (states & NetWmStateBelow)
        atoms.push_back(atom(QXcbAtom::_NET_WM_STATE_BELOW));
    if (states & NetWmStateFullScreen)
        atoms.push_back(atom(QXcbAtom::_NET_WM_STATE_FULLSCREEN));
    if (states & NetWmStateMaximizedHorz)
        atoms.push_back(atom(QXcbAtom::_NET_WM_STATE_MAXIMIZED_HORZ));
    if (states & NetWmStateMaximizedVert)
        atoms.push_back(atom(QXcbAtom::_NET_WM_STATE_MAXIMIZED_VERT));
    if (states & NetWmStateModal)
        atoms.push_back(atom(QXcbAtom::_NET_WM_STATE_MODAL));
    if (states & NetWmStateStaysOnTop)
        atoms.push_back(atom(QXcbAtom::_NET_WM_STATE_STAYS_ON_TOP));
    if (states & NetWmStateDemandsAttention)
        atoms.push_back(atom(QXcbAtom::_NET_WM_STATE_DEMANDS_ATTENTION));

    if (atoms.isEmpty()) {
        Q_XCB_CALL(xcb_delete_property(xcb_connection(), m_window, atom(QXcbAtom::_NET_WM_STATE)));
    } else {
        Q_XCB_CALL(xcb_change_property(xcb_connection(), XCB_PROP_MODE_REPLACE, m_window,
                                       atom(QXcbAtom::_NET_WM_STATE), XCB_ATOM_ATOM, 32,
                                       atoms.count(), atoms.constData()));
    }
    xcb_flush(xcb_connection());
}

Qt::WindowFlags QXcbWindow::setWindowFlags(Qt::WindowFlags flags)
{
    Qt::WindowType type = static_cast<Qt::WindowType>(int(flags & Qt::WindowType_Mask));

    if (type == Qt::ToolTip)
        flags |= Qt::WindowStaysOnTopHint | Qt::FramelessWindowHint | Qt::X11BypassWindowManagerHint;
    if (type == Qt::Popup)
        flags |= Qt::X11BypassWindowManagerHint;

    if (flags & Qt::WindowTransparentForInput) {
        uint32_t mask = XCB_EVENT_MASK_EXPOSURE | XCB_EVENT_MASK_VISIBILITY_CHANGE
                 | XCB_EVENT_MASK_STRUCTURE_NOTIFY | XCB_EVENT_MASK_RESIZE_REDIRECT
                | XCB_EVENT_MASK_SUBSTRUCTURE_NOTIFY | XCB_EVENT_MASK_SUBSTRUCTURE_REDIRECT
                | XCB_EVENT_MASK_FOCUS_CHANGE  | XCB_EVENT_MASK_PROPERTY_CHANGE
                | XCB_EVENT_MASK_COLOR_MAP_CHANGE | XCB_EVENT_MASK_OWNER_GRAB_BUTTON;
        xcb_change_window_attributes(xcb_connection(), xcb_window(), XCB_CW_EVENT_MASK, &mask);
    }

    setNetWmWindowFlags(flags);
    setMotifWindowFlags(flags);

    setTransparentForMouseEvents(flags & Qt::WindowTransparentForInput);
    updateDoesNotAcceptFocus(flags & Qt::WindowDoesNotAcceptFocus);

    return flags;
}

void QXcbWindow::setMotifWindowFlags(Qt::WindowFlags flags)
{
    Qt::WindowType type = static_cast<Qt::WindowType>(int(flags & Qt::WindowType_Mask));

    QtMotifWmHints mwmhints;
    mwmhints.flags = 0L;
    mwmhints.functions = 0L;
    mwmhints.decorations = 0;
    mwmhints.input_mode = 0L;
    mwmhints.status = 0L;

    if (type != Qt::SplashScreen) {
        mwmhints.flags |= MWM_HINTS_DECORATIONS;

        bool customize = flags & Qt::CustomizeWindowHint;
        if (!(flags & Qt::FramelessWindowHint) && !(customize && !(flags & Qt::WindowTitleHint))) {
            mwmhints.decorations |= MWM_DECOR_BORDER;
            mwmhints.decorations |= MWM_DECOR_RESIZEH;

            if (flags & Qt::WindowTitleHint)
                mwmhints.decorations |= MWM_DECOR_TITLE;

            if (flags & Qt::WindowSystemMenuHint)
                mwmhints.decorations |= MWM_DECOR_MENU;

            if (flags & Qt::WindowMinimizeButtonHint) {
                mwmhints.decorations |= MWM_DECOR_MINIMIZE;
                mwmhints.functions |= MWM_FUNC_MINIMIZE;
            }

            if (flags & Qt::WindowMaximizeButtonHint) {
                mwmhints.decorations |= MWM_DECOR_MAXIMIZE;
                mwmhints.functions |= MWM_FUNC_MAXIMIZE;
            }

            if (flags & Qt::WindowCloseButtonHint)
                mwmhints.functions |= MWM_FUNC_CLOSE;
        }
    } else {
        // if type == Qt::SplashScreen
        mwmhints.decorations = MWM_DECOR_ALL;
    }

    if (mwmhints.functions != 0) {
        mwmhints.flags |= MWM_HINTS_FUNCTIONS;
        mwmhints.functions |= MWM_FUNC_MOVE | MWM_FUNC_RESIZE;
    } else {
        mwmhints.functions = MWM_FUNC_ALL;
    }

    if (!(flags & Qt::FramelessWindowHint)
        && flags & Qt::CustomizeWindowHint
        && flags & Qt::WindowTitleHint
        && !(flags &
             (Qt::WindowMinimizeButtonHint
              | Qt::WindowMaximizeButtonHint
              | Qt::WindowCloseButtonHint)))
    {
        // a special case - only the titlebar without any button
        mwmhints.flags = MWM_HINTS_FUNCTIONS;
        mwmhints.functions = MWM_FUNC_MOVE | MWM_FUNC_RESIZE;
        mwmhints.decorations = 0;
    }

    setMotifWmHints(connection(), m_window, mwmhints);
}

void QXcbWindow::changeNetWmState(bool set, xcb_atom_t one, xcb_atom_t two)
{
    xcb_client_message_event_t event;

    event.response_type = XCB_CLIENT_MESSAGE;
    event.format = 32;
    event.window = m_window;
    event.type = atom(QXcbAtom::_NET_WM_STATE);
    event.data.data32[0] = set ? 1 : 0;
    event.data.data32[1] = one;
    event.data.data32[2] = two;
    event.data.data32[3] = 0;
    event.data.data32[4] = 0;

    Q_XCB_CALL(xcb_send_event(xcb_connection(), 0, m_screen->root(), XCB_EVENT_MASK_STRUCTURE_NOTIFY | XCB_EVENT_MASK_SUBSTRUCTURE_REDIRECT, (const char *)&event));
}

Qt::WindowState QXcbWindow::setWindowState(Qt::WindowState state)
{
    if (state == m_windowState)
        return state;

    // unset old state
    switch (m_windowState) {
    case Qt::WindowMinimized:
        Q_XCB_CALL(xcb_map_window(xcb_connection(), m_window));
        break;
    case Qt::WindowMaximized:
        changeNetWmState(false,
                         atom(QXcbAtom::_NET_WM_STATE_MAXIMIZED_HORZ),
                         atom(QXcbAtom::_NET_WM_STATE_MAXIMIZED_VERT));
        break;
    case Qt::WindowFullScreen:
        changeNetWmState(false, atom(QXcbAtom::_NET_WM_STATE_FULLSCREEN));
        break;
    default:
        break;
    }

    // set new state
    switch (state) {
    case Qt::WindowMinimized:
        {
            xcb_client_message_event_t event;

            event.response_type = XCB_CLIENT_MESSAGE;
            event.format = 32;
            event.window = m_window;
            event.type = atom(QXcbAtom::WM_CHANGE_STATE);
            event.data.data32[0] = XCB_WM_STATE_ICONIC;
            event.data.data32[1] = 0;
            event.data.data32[2] = 0;
            event.data.data32[3] = 0;
            event.data.data32[4] = 0;

            Q_XCB_CALL(xcb_send_event(xcb_connection(), 0, m_screen->root(), XCB_EVENT_MASK_STRUCTURE_NOTIFY | XCB_EVENT_MASK_SUBSTRUCTURE_REDIRECT, (const char *)&event));
        }
        break;
    case Qt::WindowMaximized:
        changeNetWmState(true,
                         atom(QXcbAtom::_NET_WM_STATE_MAXIMIZED_HORZ),
                         atom(QXcbAtom::_NET_WM_STATE_MAXIMIZED_VERT));
        break;
    case Qt::WindowFullScreen:
        changeNetWmState(true, atom(QXcbAtom::_NET_WM_STATE_FULLSCREEN));
        break;
    case Qt::WindowNoState:
        break;
    default:
        break;
    }

    connection()->sync();

    m_windowState = state;
    return m_windowState;
}

void QXcbWindow::setNetWmWindowFlags(Qt::WindowFlags flags)
{
    // in order of decreasing priority
    QVector<uint> windowTypes;

    Qt::WindowType type = static_cast<Qt::WindowType>(int(flags & Qt::WindowType_Mask));

    switch (type) {
    case Qt::Dialog:
    case Qt::Sheet:
        windowTypes.append(atom(QXcbAtom::_NET_WM_WINDOW_TYPE_DIALOG));
        break;
    case Qt::Tool:
    case Qt::Drawer:
        windowTypes.append(atom(QXcbAtom::_NET_WM_WINDOW_TYPE_UTILITY));
        break;
    case Qt::ToolTip:
        windowTypes.append(atom(QXcbAtom::_NET_WM_WINDOW_TYPE_TOOLTIP));
        break;
    case Qt::SplashScreen:
        windowTypes.append(atom(QXcbAtom::_NET_WM_WINDOW_TYPE_SPLASH));
        break;
    default:
        break;
    }

    if (flags & Qt::FramelessWindowHint)
        windowTypes.append(atom(QXcbAtom::_KDE_NET_WM_WINDOW_TYPE_OVERRIDE));

    windowTypes.append(atom(QXcbAtom::_NET_WM_WINDOW_TYPE_NORMAL));

    Q_XCB_CALL(xcb_change_property(xcb_connection(), XCB_PROP_MODE_REPLACE, m_window,
                                   atom(QXcbAtom::_NET_WM_WINDOW_TYPE), XCB_ATOM_ATOM, 32,
                                   windowTypes.count(), windowTypes.constData()));
}

void QXcbWindow::updateMotifWmHintsBeforeMap()
{
    QtMotifWmHints mwmhints = getMotifWmHints(connection(), m_window);

    if (window()->windowModality() != Qt::NonModal) {
        switch (window()->windowModality()) {
        case Qt::WindowModal:
            mwmhints.input_mode = MWM_INPUT_PRIMARY_APPLICATION_MODAL;
            break;
        case Qt::ApplicationModal:
        default:
            mwmhints.input_mode = MWM_INPUT_FULL_APPLICATION_MODAL;
            break;
        }
        mwmhints.flags |= MWM_HINTS_INPUT_MODE;
    } else {
        mwmhints.input_mode = MWM_INPUT_MODELESS;
        mwmhints.flags &= ~MWM_HINTS_INPUT_MODE;
    }

    if (window()->minimumSize() == window()->maximumSize()) {
        // fixed size, remove the resize handle (since mwm/dtwm
        // isn't smart enough to do it itself)
        mwmhints.flags |= MWM_HINTS_FUNCTIONS;
        if (mwmhints.functions == MWM_FUNC_ALL) {
            mwmhints.functions = MWM_FUNC_MOVE;
        } else {
            mwmhints.functions &= ~MWM_FUNC_RESIZE;
        }

        if (mwmhints.decorations == MWM_DECOR_ALL) {
            mwmhints.flags |= MWM_HINTS_DECORATIONS;
            mwmhints.decorations = (MWM_DECOR_BORDER
                                    | MWM_DECOR_TITLE
                                    | MWM_DECOR_MENU);
        } else {
            mwmhints.decorations &= ~MWM_DECOR_RESIZEH;
        }
    }

    if (window()->windowFlags() & Qt::WindowMinimizeButtonHint) {
        mwmhints.flags |= MWM_HINTS_DECORATIONS;
        mwmhints.decorations |= MWM_DECOR_MINIMIZE;
        mwmhints.functions |= MWM_FUNC_MINIMIZE;
    }
    if (window()->windowFlags() & Qt::WindowMaximizeButtonHint) {
        mwmhints.flags |= MWM_HINTS_DECORATIONS;
        mwmhints.decorations |= MWM_DECOR_MAXIMIZE;
        mwmhints.functions |= MWM_FUNC_MAXIMIZE;
    }
    if (window()->windowFlags() & Qt::WindowCloseButtonHint)
        mwmhints.functions |= MWM_FUNC_CLOSE;

    setMotifWmHints(connection(), m_window, mwmhints);
}

void QXcbWindow::updateNetWmStateBeforeMap()
{
    NetWmStates states(0);

    const Qt::WindowFlags flags = window()->windowFlags();
    if (flags & Qt::WindowStaysOnTopHint) {
        states |= NetWmStateAbove;
        states |= NetWmStateStaysOnTop;
    } else if (flags & Qt::WindowStaysOnBottomHint) {
        states |= NetWmStateBelow;
    }

    if (window()->windowState() & Qt::WindowFullScreen)
        states |= NetWmStateFullScreen;

    if (window()->windowState() & Qt::WindowMaximized) {
        states |= NetWmStateMaximizedHorz;
        states |= NetWmStateMaximizedVert;
    }

    if (window()->windowModality() != Qt::NonModal)
        states |= NetWmStateModal;

    setNetWmStates(states);
}

void QXcbWindow::updateNetWmUserTime(xcb_timestamp_t timestamp)
{
    xcb_window_t wid = m_window;

    const bool isSupportedByWM = connection()->wmSupport()->isSupportedByWM(atom(QXcbAtom::_NET_WM_USER_TIME_WINDOW));
    if (m_netWmUserTimeWindow || isSupportedByWM) {
        if (!m_netWmUserTimeWindow) {
            m_netWmUserTimeWindow = xcb_generate_id(xcb_connection());
            Q_XCB_CALL(xcb_create_window(xcb_connection(),
                                         XCB_COPY_FROM_PARENT,            // depth -- same as root
                                         m_netWmUserTimeWindow,                        // window id
                                         m_window,                   // parent window id
                                         -1, -1, 1, 1,
                                         0,                               // border width
                                         XCB_WINDOW_CLASS_INPUT_OUTPUT,   // window class
                                         m_visualId,                      // visual
                                         0,                               // value mask
                                         0));                             // value list
            wid = m_netWmUserTimeWindow;
            xcb_change_property(xcb_connection(), XCB_PROP_MODE_REPLACE, m_window, atom(QXcbAtom::_NET_WM_USER_TIME_WINDOW),
                                XCB_ATOM_WINDOW, 32, 1, &m_netWmUserTimeWindow);
            xcb_delete_property(xcb_connection(), m_window, atom(QXcbAtom::_NET_WM_USER_TIME));
        } else if (!isSupportedByWM) {
            // WM no longer supports it, then we should remove the
            // _NET_WM_USER_TIME_WINDOW atom.
            xcb_delete_property(xcb_connection(), m_window, atom(QXcbAtom::_NET_WM_USER_TIME_WINDOW));
            xcb_destroy_window(xcb_connection(), m_netWmUserTimeWindow);
            m_netWmUserTimeWindow = XCB_NONE;
        } else {
            wid = m_netWmUserTimeWindow;
        }
    }
    xcb_change_property(xcb_connection(), XCB_PROP_MODE_REPLACE, wid, atom(QXcbAtom::_NET_WM_USER_TIME),
                        XCB_ATOM_CARDINAL, 32, 1, &timestamp);
}

void QXcbWindow::setTransparentForMouseEvents(bool transparent)
{
    if (transparent == m_transparent)
        return;

    xcb_rectangle_t rectangle;

    xcb_rectangle_t *rect = 0;
    int nrect = 0;

    if (!transparent) {
        rectangle.x = 0;
        rectangle.y = 0;
        rectangle.width = geometry().width();
        rectangle.height = geometry().height();
        rect = &rectangle;
        nrect = 1;
    }

    xcb_xfixes_region_t region = xcb_generate_id(xcb_connection());
    xcb_xfixes_create_region(xcb_connection(), region, nrect, rect);
    xcb_xfixes_set_window_shape_region_checked(xcb_connection(), m_window, XCB_SHAPE_SK_INPUT, 0, 0, region);
    xcb_xfixes_destroy_region(xcb_connection(), region);

    m_transparent = transparent;
}

void QXcbWindow::updateDoesNotAcceptFocus(bool doesNotAcceptFocus)
{
    xcb_get_property_cookie_t cookie = xcb_get_wm_hints_unchecked(xcb_connection(), m_window);

    xcb_wm_hints_t hints;
    if (!xcb_get_wm_hints_reply(xcb_connection(), cookie, &hints, NULL)) {
        return;
    }

    xcb_wm_hints_set_input(&hints, !doesNotAcceptFocus);
    xcb_set_wm_hints(xcb_connection(), m_window, &hints);
}

WId QXcbWindow::winId() const
{
    return m_window;
}

void QXcbWindow::setParent(const QPlatformWindow *parent)
{
    // re-create for compatibility
    create();

    QPoint topLeft = geometry().topLeft();

    xcb_window_t xcb_parent_id = parent ? static_cast<const QXcbWindow *>(parent)->xcb_window() : m_screen->root();
    Q_XCB_CALL(xcb_reparent_window(xcb_connection(), xcb_window(), xcb_parent_id, topLeft.x(), topLeft.y()));
}

void QXcbWindow::setWindowTitle(const QString &title)
{
    QByteArray ba = title.toUtf8();
    Q_XCB_CALL(xcb_change_property(xcb_connection(),
                                   XCB_PROP_MODE_REPLACE,
                                   m_window,
                                   atom(QXcbAtom::_NET_WM_NAME),
                                   atom(QXcbAtom::UTF8_STRING),
                                   8,
                                   ba.length(),
                                   ba.constData()));
}

void QXcbWindow::raise()
{
    const quint32 mask = XCB_CONFIG_WINDOW_STACK_MODE;
    const quint32 values[] = { XCB_STACK_MODE_ABOVE };
    Q_XCB_CALL(xcb_configure_window(xcb_connection(), m_window, mask, values));
}

void QXcbWindow::lower()
{
    const quint32 mask = XCB_CONFIG_WINDOW_STACK_MODE;
    const quint32 values[] = { XCB_STACK_MODE_BELOW };
    Q_XCB_CALL(xcb_configure_window(xcb_connection(), m_window, mask, values));
}

void QXcbWindow::propagateSizeHints()
{
    // update WM_NORMAL_HINTS
    xcb_size_hints_t hints;
    memset(&hints, 0, sizeof(hints));

    QRect rect = geometry();

    QWindow *win = window();

    xcb_size_hints_set_position(&hints, true, rect.x(), rect.y());
    xcb_size_hints_set_size(&hints, true, rect.width(), rect.height());
    xcb_size_hints_set_win_gravity(&hints, qt_window_private(win)->positionPolicy == QWindowPrivate::WindowFrameInclusive
                                           ? XCB_GRAVITY_NORTH_WEST : XCB_GRAVITY_STATIC);

    QSize minimumSize = win->minimumSize();
    QSize maximumSize = win->maximumSize();
    QSize baseSize = win->baseSize();
    QSize sizeIncrement = win->sizeIncrement();

    if (minimumSize.width() > 0 || minimumSize.height() > 0)
        xcb_size_hints_set_min_size(&hints, minimumSize.width(), minimumSize.height());

    if (maximumSize.width() < QWINDOWSIZE_MAX || maximumSize.height() < QWINDOWSIZE_MAX)
        xcb_size_hints_set_max_size(&hints,
                                    qMin(XCOORD_MAX, maximumSize.width()),
                                    qMin(XCOORD_MAX, maximumSize.height()));

    if (sizeIncrement.width() > 0 || sizeIncrement.height() > 0) {
        xcb_size_hints_set_base_size(&hints, baseSize.width(), baseSize.height());
        xcb_size_hints_set_resize_inc(&hints, sizeIncrement.width(), sizeIncrement.height());
    }

    xcb_set_wm_normal_hints(xcb_connection(), m_window, &hints);
}

void QXcbWindow::requestActivateWindow()
{
    if (!m_mapped) {
        m_deferredActivation = true;
        return;
    }
    m_deferredActivation = false;

    updateNetWmUserTime(connection()->time());

    if (window()->isTopLevel()
        && connection()->wmSupport()->isSupportedByWM(atom(QXcbAtom::_NET_ACTIVE_WINDOW))) {
        xcb_client_message_event_t event;

        event.response_type = XCB_CLIENT_MESSAGE;
        event.format = 32;
        event.window = m_window;
        event.type = atom(QXcbAtom::_NET_ACTIVE_WINDOW);
        event.data.data32[0] = 1;
        event.data.data32[1] = connection()->time();
        QWindow *focusWindow = QGuiApplication::focusWindow();
        event.data.data32[2] = focusWindow ? focusWindow->winId() : XCB_NONE;
        event.data.data32[3] = 0;
        event.data.data32[4] = 0;

        Q_XCB_CALL(xcb_send_event(xcb_connection(), 0, m_screen->root(), XCB_EVENT_MASK_STRUCTURE_NOTIFY | XCB_EVENT_MASK_SUBSTRUCTURE_REDIRECT, (const char *)&event));
    } else {
        Q_XCB_CALL(xcb_set_input_focus(xcb_connection(), XCB_INPUT_FOCUS_PARENT, m_window, connection()->time()));
    }

    connection()->sync();
}

#if XCB_USE_MAEMO_WINDOW_PROPERTIES
void QXcbWindow::handleContentOrientationChange(Qt::ScreenOrientation orientation)
{
    int angle = 0;
    switch (orientation) {
        case Qt::PortraitOrientation: angle = 270; break;
        case Qt::LandscapeOrientation: angle = 0; break;
        case Qt::InvertedPortraitOrientation: angle = 90; break;
        case Qt::InvertedLandscapeOrientation: angle = 180; break;
        case Qt::PrimaryOrientation: break;
    }
    Q_XCB_CALL(xcb_change_property(xcb_connection(), XCB_PROP_MODE_REPLACE, m_window,
                                   atom(QXcbAtom::MeegoTouchOrientationAngle), XCB_ATOM_CARDINAL, 32,
                                   1, &angle));
}
#endif

QSurfaceFormat QXcbWindow::format() const
{
    // ### return actual format
    return m_format;
}

#if defined(XCB_USE_EGL)
QXcbEGLSurface *QXcbWindow::eglSurface() const
{
    if (!m_eglSurface) {
        EGLDisplay display = connection()->egl_display();
        EGLConfig config = q_configFromGLFormat(display, window()->requestedFormat(), true);
        EGLSurface surface = eglCreateWindowSurface(display, config, (EGLNativeWindowType)m_window, 0);

        m_eglSurface = new QXcbEGLSurface(display, surface);
    }

    return m_eglSurface;
}
#endif

void QXcbWindow::handleExposeEvent(const xcb_expose_event_t *event)
{
    QRect rect(event->x, event->y, event->width, event->height);

    if (m_exposeRegion.isEmpty())
        m_exposeRegion = rect;
    else
        m_exposeRegion |= rect;

    // if count is non-zero there are more expose events pending
    if (event->count == 0) {
        QWindowSystemInterface::handleExposeEvent(window(), m_exposeRegion);
        m_exposeRegion = QRegion();
    }
}

void QXcbWindow::handleClientMessageEvent(const xcb_client_message_event_t *event)
{
    if (event->format != 32)
        return;

    if (event->type == atom(QXcbAtom::WM_PROTOCOLS)) {
        if (event->data.data32[0] == atom(QXcbAtom::WM_DELETE_WINDOW)) {
            QWindowSystemInterface::handleCloseEvent(window());
        } else if (event->data.data32[0] == atom(QXcbAtom::WM_TAKE_FOCUS)) {
            connection()->setTime(event->data.data32[1]);
        } else if (event->data.data32[0] == atom(QXcbAtom::_NET_WM_PING)) {
            xcb_client_message_event_t reply = *event;

            reply.response_type = XCB_CLIENT_MESSAGE;
            reply.window = m_screen->root();

            xcb_send_event(xcb_connection(), 0, m_screen->root(), XCB_EVENT_MASK_STRUCTURE_NOTIFY | XCB_EVENT_MASK_SUBSTRUCTURE_REDIRECT, (const char *)&reply);
            xcb_flush(xcb_connection());
        } else if (event->data.data32[0] == atom(QXcbAtom::_NET_WM_SYNC_REQUEST)) {
            connection()->setTime(event->data.data32[1]);
            m_syncValue.lo = event->data.data32[2];
            m_syncValue.hi = event->data.data32[3];
        } else {
            qWarning() << "QXcbWindow: Unhandled WM_PROTOCOLS message:" << connection()->atomName(event->data.data32[0]);
        }
    } else if (event->type == atom(QXcbAtom::XdndEnter)) {
        connection()->drag()->handleEnter(window(), event);
    } else if (event->type == atom(QXcbAtom::XdndPosition)) {
        connection()->drag()->handlePosition(window(), event);
    } else if (event->type == atom(QXcbAtom::XdndLeave)) {
        connection()->drag()->handleLeave(window(), event);
    } else if (event->type == atom(QXcbAtom::XdndDrop)) {
        connection()->drag()->handleDrop(window(), event);
    } else if (event->type == atom(QXcbAtom::_XEMBED)) { // QSystemTrayIcon
    } else {
        qWarning() << "QXcbWindow: Unhandled client message:" << connection()->atomName(event->type);
    }
}

void QXcbWindow::handleConfigureNotifyEvent(const xcb_configure_notify_event_t *event)
{
    bool fromSendEvent = (event->response_type & 0x80);
    QPoint pos(event->x, event->y);
    if (!parent() && !fromSendEvent) {
        // Do not trust the position, query it instead.
        xcb_translate_coordinates_cookie_t cookie = xcb_translate_coordinates(xcb_connection(), xcb_window(),
                                                                              m_screen->root(), 0, 0);
        xcb_translate_coordinates_reply_t *reply = xcb_translate_coordinates_reply(xcb_connection(), cookie, NULL);
        if (reply) {
            pos.setX(reply->dst_x);
            pos.setY(reply->dst_y);
            free(reply);
        }
    }

    QRect rect(pos, QSize(event->width, event->height));

    QPlatformWindow::setGeometry(rect);
    QWindowSystemInterface::handleGeometryChange(window(), rect);

    m_configureNotifyPending = false;

    if (m_deferredExpose) {
        m_deferredExpose = false;
        QWindowSystemInterface::handleExposeEvent(window(), QRect(QPoint(), geometry().size()));
    }

    m_dirtyFrameMargins = true;

#if XCB_USE_DRI2
    if (m_context)
        static_cast<QDri2Context *>(m_context)->resize(rect.size());
#endif
}

bool QXcbWindow::isExposed() const
{
    return m_mapped;
}

void QXcbWindow::handleMapNotifyEvent(const xcb_map_notify_event_t *event)
{
    if (event->window == m_window) {
        m_mapped = true;
        if (m_deferredActivation)
            requestActivateWindow();
        if (m_configureNotifyPending)
            m_deferredExpose = true;
        else
            QWindowSystemInterface::handleExposeEvent(window(), QRect(QPoint(), geometry().size()));
    }
}

void QXcbWindow::handleUnmapNotifyEvent(const xcb_unmap_notify_event_t *event)
{
    if (event->window == m_window) {
        m_mapped = false;
        QWindowSystemInterface::handleExposeEvent(window(), QRegion());
    }
}

static Qt::MouseButtons translateMouseButtons(int s)
{
    Qt::MouseButtons ret = 0;
    if (s & XCB_BUTTON_MASK_1)
        ret |= Qt::LeftButton;
    if (s & XCB_BUTTON_MASK_2)
        ret |= Qt::MidButton;
    if (s & XCB_BUTTON_MASK_3)
        ret |= Qt::RightButton;
    return ret;
}

static Qt::MouseButton translateMouseButton(xcb_button_t s)
{
    switch (s) {
    case 1: return Qt::LeftButton;
    case 2: return Qt::MidButton;
    case 3: return Qt::RightButton;
    // Button values 4-7 were already handled as Wheel events, and won't occur here.
    case 8: return Qt::BackButton;      // Also known as Qt::ExtraButton1
    case 9: return Qt::ForwardButton;   // Also known as Qt::ExtraButton2
    case 10: return Qt::ExtraButton3;
    case 11: return Qt::ExtraButton4;
    case 12: return Qt::ExtraButton5;
    case 13: return Qt::ExtraButton6;
    case 14: return Qt::ExtraButton7;
    case 15: return Qt::ExtraButton8;
    case 16: return Qt::ExtraButton9;
    case 17: return Qt::ExtraButton10;
    case 18: return Qt::ExtraButton11;
    case 19: return Qt::ExtraButton12;
    case 20: return Qt::ExtraButton13;
    case 21: return Qt::ExtraButton14;
    case 22: return Qt::ExtraButton15;
    case 23: return Qt::ExtraButton16;
    case 24: return Qt::ExtraButton17;
    case 25: return Qt::ExtraButton18;
    case 26: return Qt::ExtraButton19;
    case 27: return Qt::ExtraButton20;
    case 28: return Qt::ExtraButton21;
    case 29: return Qt::ExtraButton22;
    case 30: return Qt::ExtraButton23;
    case 31: return Qt::ExtraButton24;
    default: return Qt::NoButton;
    }
}

void QXcbWindow::handleButtonPressEvent(const xcb_button_press_event_t *event)
{
    updateNetWmUserTime(event->time);

    QPoint local(event->event_x, event->event_y);
    QPoint global(event->root_x, event->root_y);

    Qt::KeyboardModifiers modifiers = connection()->keyboard()->translateModifiers(event->state);

    if (event->detail >= 4 && event->detail <= 7) {
        // Logic borrowed from qapplication_x11.cpp
        int delta = 120 * ((event->detail == 4 || event->detail == 6) ? 1 : -1);
        bool hor = (((event->detail == 4 || event->detail == 5)
                     && (modifiers & Qt::AltModifier))
                    || (event->detail == 6 || event->detail == 7));

        QWindowSystemInterface::handleWheelEvent(window(), event->time,
                                                 local, global, delta, hor ? Qt::Horizontal : Qt::Vertical, modifiers);
        return;
    }

    handleMouseEvent(event->detail, event->state, event->time, local, global, modifiers);
}

void QXcbWindow::handleButtonReleaseEvent(const xcb_button_release_event_t *event)
{
    QPoint local(event->event_x, event->event_y);
    QPoint global(event->root_x, event->root_y);
    Qt::KeyboardModifiers modifiers = connection()->keyboard()->translateModifiers(event->state);

    handleMouseEvent(event->detail, event->state, event->time, local, global, modifiers);
}

void QXcbWindow::handleMotionNotifyEvent(const xcb_motion_notify_event_t *event)
{
    QPoint local(event->event_x, event->event_y);
    QPoint global(event->root_x, event->root_y);
    Qt::KeyboardModifiers modifiers = connection()->keyboard()->translateModifiers(event->state);

    handleMouseEvent(event->detail, event->state, event->time, local, global, modifiers);
}

void QXcbWindow::handleMouseEvent(xcb_button_t detail, uint16_t state, xcb_timestamp_t time, const QPoint &local, const QPoint &global, Qt::KeyboardModifiers modifiers)
{
    connection()->setTime(time);

    Qt::MouseButtons buttons = translateMouseButtons(state);
    Qt::MouseButton button = translateMouseButton(detail);

    buttons ^= button; // X event uses state *before*, Qt uses state *after*

    QWindowSystemInterface::handleMouseEvent(window(), time, local, global, buttons, modifiers);
}

void QXcbWindow::handleEnterNotifyEvent(const xcb_enter_notify_event_t *event)
{
    connection()->setTime(event->time);

    if ((event->mode != XCB_NOTIFY_MODE_NORMAL && event->mode != XCB_NOTIFY_MODE_UNGRAB)
        || event->detail == XCB_NOTIFY_DETAIL_VIRTUAL
        || event->detail == XCB_NOTIFY_DETAIL_NONLINEAR_VIRTUAL)
    {
        return;
    }

    QWindowSystemInterface::handleEnterEvent(window());
}

void QXcbWindow::handleLeaveNotifyEvent(const xcb_leave_notify_event_t *event)
{
    connection()->setTime(event->time);

    if ((event->mode != XCB_NOTIFY_MODE_NORMAL && event->mode != XCB_NOTIFY_MODE_UNGRAB)
        || event->detail == XCB_NOTIFY_DETAIL_INFERIOR)
    {
        return;
    }

    QWindowSystemInterface::handleLeaveEvent(window());
}

void QXcbWindow::handlePropertyNotifyEvent(const xcb_property_notify_event_t *event)
{
    connection()->setTime(event->time);

    const bool propertyDeleted = event->state == XCB_PROPERTY_DELETE;
    const xcb_atom_t netWmStateAtom = atom(QXcbAtom::_NET_WM_STATE);
    const xcb_atom_t wmStateAtom = atom(QXcbAtom::WM_STATE);

    if (event->atom == netWmStateAtom || event->atom == wmStateAtom) {
        if (propertyDeleted)
            return;

        Qt::WindowState newState = Qt::WindowNoState;
        if (event->atom == wmStateAtom) { // WM_STATE: Quick check for 'Minimize'.
            const xcb_get_property_cookie_t get_cookie =
                xcb_get_property(xcb_connection(), 0, m_window, wmStateAtom,
                                 XCB_ATOM_ANY, 0, 1024);

            xcb_get_property_reply_t *reply =
                xcb_get_property_reply(xcb_connection(), get_cookie, NULL);

            if (reply && reply->format == 32 && reply->type == wmStateAtom) {
                const long *data = (const long *)xcb_get_property_value(reply);
                if (reply->length != 0 && XCB_WM_STATE_ICONIC == data[0])
                    newState = Qt::WindowMinimized;
                free(reply);
            }
        } // WM_STATE: Quick check for 'Minimize'.
        if (newState != Qt::WindowMinimized) { // Something else changed, get _NET_WM_STATE.
            const NetWmStates states = netWmStates();
            if ((states & NetWmStateMaximizedHorz) && (states & NetWmStateMaximizedVert))
                newState = Qt::WindowMaximized;
            else if (states & NetWmStateFullScreen)
                newState = Qt::WindowFullScreen;
        }
        // Send Window state, compress events in case other flags (modality, etc) are changed.
        if (m_lastWindowStateEvent != newState) {
            QWindowSystemInterface::handleWindowStateChanged(window(), newState);
            m_lastWindowStateEvent = newState;
        }
    }
}

void QXcbWindow::handleFocusInEvent(const xcb_focus_in_event_t *)
{
    QWindowSystemInterface::handleWindowActivated(window());
}

static bool focusInPeeker(xcb_generic_event_t *event)
{
    if (!event) {
        // FocusIn event is not in the queue, proceed with FocusOut normally.
        QWindowSystemInterface::handleWindowActivated(0);
        return true;
    }
    uint response_type = event->response_type & ~0x80;
    return response_type == XCB_FOCUS_IN;
}

void QXcbWindow::handleFocusOutEvent(const xcb_focus_out_event_t *)
{
    // Do not set the active window to 0 if there is a FocusIn coming.
    // There is however no equivalent for XPutBackEvent so register a
    // callback for QXcbConnection instead.
    connection()->addPeekFunc(focusInPeeker);
}

void QXcbWindow::updateSyncRequestCounter()
{
    if (m_screen->syncRequestSupported() && (m_syncValue.lo != 0 || m_syncValue.hi != 0)) {
        Q_XCB_CALL(xcb_sync_set_counter(xcb_connection(), m_syncCounter, m_syncValue));
        xcb_flush(xcb_connection());
        connection()->sync();

        m_syncValue.lo = 0;
        m_syncValue.hi = 0;
    }
}

bool QXcbWindow::setKeyboardGrabEnabled(bool grab)
{
    if (!grab) {
        xcb_ungrab_keyboard(xcb_connection(), XCB_TIME_CURRENT_TIME);
        return true;
    }
    xcb_grab_keyboard_cookie_t cookie = xcb_grab_keyboard(xcb_connection(), false,
                                                          m_window, XCB_TIME_CURRENT_TIME,
                                                          XCB_GRAB_MODE_ASYNC, XCB_GRAB_MODE_ASYNC);
    xcb_grab_keyboard_reply_t *reply = xcb_grab_keyboard_reply(xcb_connection(), cookie, NULL);
    bool result = !(!reply || reply->status != XCB_GRAB_STATUS_SUCCESS);
    free(reply);
    return result;
}

bool QXcbWindow::setMouseGrabEnabled(bool grab)
{
    if (!grab) {
        xcb_ungrab_pointer(xcb_connection(), XCB_TIME_CURRENT_TIME);
        return true;
    }
    xcb_grab_pointer_cookie_t cookie = xcb_grab_pointer(xcb_connection(), false, m_window,
                                                        (XCB_EVENT_MASK_BUTTON_PRESS | XCB_EVENT_MASK_BUTTON_RELEASE
                                                         | XCB_EVENT_MASK_BUTTON_MOTION | XCB_EVENT_MASK_ENTER_WINDOW
                                                         | XCB_EVENT_MASK_LEAVE_WINDOW | XCB_EVENT_MASK_POINTER_MOTION),
                                                        XCB_GRAB_MODE_ASYNC, XCB_GRAB_MODE_ASYNC,
                                                        XCB_WINDOW_NONE, XCB_CURSOR_NONE,
                                                        XCB_TIME_CURRENT_TIME);
    xcb_grab_pointer_reply_t *reply = xcb_grab_pointer_reply(xcb_connection(), cookie, NULL);
    bool result = !(!reply || reply->status != XCB_GRAB_STATUS_SUCCESS);
    free(reply);
    return result;
}

void QXcbWindow::setCursor(xcb_cursor_t cursor)
{
    xcb_change_window_attributes(xcb_connection(), m_window, XCB_CW_CURSOR, &cursor);
    xcb_flush(xcb_connection());
}

QT_END_NAMESPACE