C++ xcb_get_property_value函数代码示例

QXcbScreen::QXcbScreen(QXcbConnection *connection, xcb_screen_t *screen, int number)
    : QXcbObject(connection)
    , m_screen(screen)
    , m_number(number)
{
    printf ("\n");
    printf ("Information of screen %d:\n", screen->root);
    printf ("  width.........: %d\n", screen->width_in_pixels);
    printf ("  height........: %d\n", screen->height_in_pixels);
    printf ("  depth.........: %d\n", screen->root_depth);
    printf ("  white pixel...: %x\n", screen->white_pixel);
    printf ("  black pixel...: %x\n", screen->black_pixel);
    printf ("\n");

    const quint32 mask = XCB_CW_EVENT_MASK;
    const quint32 values[] = {
        // XCB_CW_EVENT_MASK
        XCB_EVENT_MASK_ENTER_WINDOW
        | XCB_EVENT_MASK_LEAVE_WINDOW
        | XCB_EVENT_MASK_PROPERTY_CHANGE
    };

    xcb_change_window_attributes(xcb_connection(), screen->root, mask, values);

    xcb_generic_error_t *error;

    xcb_get_property_reply_t *reply =
        xcb_get_property_reply(xcb_connection(),
            xcb_get_property(xcb_connection(), false, screen->root,
                             atom(QXcbAtom::_NET_SUPPORTING_WM_CHECK),
                             XCB_ATOM_WINDOW, 0, 1024), &error);

    if (reply && reply->format == 32 && reply->type == XCB_ATOM_WINDOW) {
        xcb_window_t windowManager = *((xcb_window_t *)xcb_get_property_value(reply));

        if (windowManager != XCB_WINDOW_NONE) {
            xcb_get_property_reply_t *windowManagerReply =
                xcb_get_property_reply(xcb_connection(),
                    xcb_get_property(xcb_connection(), false, windowManager,
                                     atom(QXcbAtom::_NET_WM_NAME),
                                     atom(QXcbAtom::UTF8_STRING), 0, 1024), &error);
            if (windowManagerReply && windowManagerReply->format == 8 && windowManagerReply->type == atom(QXcbAtom::UTF8_STRING)) {
                m_windowManagerName = QString::fromUtf8((const char *)xcb_get_property_value(windowManagerReply), xcb_get_property_value_length(windowManagerReply));
                printf("Running window manager: %s\n", qPrintable(m_windowManagerName));
            } else if (error) {
                connection->handleXcbError(error);
                free(error);
            }

            free(windowManagerReply);
        }
    } else if (error) {
        connection->handleXcbError(error);
        free(error);
    }

    free(reply);

    m_syncRequestSupported = m_windowManagerName != QLatin1String("KWin");
}

static xcb_window_t xdndProxy(QXcbConnection *c, xcb_window_t w)
{
    xcb_window_t proxy = XCB_NONE;

    xcb_get_property_cookie_t cookie = Q_XCB_CALL2(xcb_get_property(c->xcb_connection(), false, w, c->atom(QXcbAtom::XdndProxy),
                                                        XCB_ATOM_WINDOW, 0, 1), c);
    xcb_get_property_reply_t *reply = xcb_get_property_reply(c->xcb_connection(), cookie, 0);

    if (reply && reply->type == XCB_ATOM_WINDOW)
        proxy = *((xcb_window_t *)xcb_get_property_value(reply));
    free(reply);

    if (proxy == XCB_NONE)
        return proxy;

    // exists and is real?
    cookie = Q_XCB_CALL2(xcb_get_property(c->xcb_connection(), false, proxy, c->atom(QXcbAtom::XdndProxy),
                                                        XCB_ATOM_WINDOW, 0, 1), c);
    reply = xcb_get_property_reply(c->xcb_connection(), cookie, 0);

    if (reply && reply->type == XCB_ATOM_WINDOW) {
        xcb_window_t p = *((xcb_window_t *)xcb_get_property_value(reply));
        if (proxy != p)
            proxy = 0;
    } else {
        proxy = 0;
    }

    free(reply);

    return proxy;
}

uint32_t get_wm_state(xcb_drawable_t win) {
    xcb_get_property_reply_t *reply;
    xcb_get_property_cookie_t cookie;
    uint32_t *statep;
    uint32_t state = 0;

    cookie = xcb_get_property(conn, false, win, wm_state, wm_state, 0,
                              sizeof (int32_t));

    reply = xcb_get_property_reply(conn, cookie, NULL);
    if (NULL == reply) {
        fprintf(stderr, "qtwm: Couldn't get properties for win %d\n", win);
        return -1;
    }

    /* Length is 0 if we didn't find it. */
    if (0 == xcb_get_property_value_length(reply)) {
        goto bad;
    }

    statep = xcb_get_property_value(reply);
    state = *statep;

bad:
    free(reply);
    return state;
}

void QXcbScreen::readXResources()
{
    int offset = 0;
    QByteArray resources;
    while(1) {
        xcb_get_property_reply_t *reply =
            xcb_get_property_reply(xcb_connection(),
                xcb_get_property_unchecked(xcb_connection(), false, screen()->root,
                                 XCB_ATOM_RESOURCE_MANAGER,
                                 XCB_ATOM_STRING, offset/4, 8192), NULL);
        bool more = false;
        if (reply && reply->format == 8 && reply->type == XCB_ATOM_STRING) {
            resources += QByteArray((const char *)xcb_get_property_value(reply), xcb_get_property_value_length(reply));
            offset += xcb_get_property_value_length(reply);
            more = reply->bytes_after != 0;
        }

        if (reply)
            free(reply);

        if (!more)
            break;
    }

    QList<QByteArray> split = resources.split('\n');
    for (int i = 0; i < split.size(); ++i) {
        const QByteArray &r = split.at(i);
        int value;
        if (xResource(r, "Xft.dpi:\t", &value))
            m_forcedDpi = value;
        else if (xResource(r, "Xft.hintstyle:\t", &value))
            m_hintStyle = QFontEngine::HintStyle(value);
    }
}

//! Process _NET_WM_STRUT reply and update fields
void Client::process_ewmh_strut(xcb_get_property_cookie_t gpc)
{
    autofree_ptr<xcb_get_property_reply_t> gpr(
        xcb_get_property_reply(g_xcb.connection, gpc, NULL)
        );

    if (!gpr) {
        WARN << "Could not retrieve _NET_WM_STRUT for window";
        m_ewmh_strut.clear();
        return;
    }

    TRACE << *gpr;

    if (gpr->type != XCB_ATOM_CARDINAL ||
        gpr->format != 32 || gpr->length != 4)
    {
        WARN << "Could not retrieve _NET_WM_STRUT for window";
        m_ewmh_strut.clear();
        return;
    }

    uint32_t* strut = (uint32_t*)xcb_get_property_value(gpr.get());

    m_ewmh_strut.valid = true;

    m_ewmh_strut.left = strut[0];
    m_ewmh_strut.right = strut[1];
    m_ewmh_strut.top = strut[2];
    m_ewmh_strut.bottom = strut[3];

    INFO << "EWMH _NET_WM_STRUT of window " << window() << " is "
         << m_ewmh_strut;
}

/** Get a window state (WM_STATE).
 * \param cookie The cookie.
 * \return The current state of the window, or 0 on error.
 */
uint32_t
window_state_get_reply(xcb_get_property_cookie_t cookie, int* pStateFound)
{

    /* This is a bug fixed in updated versions of awesome already */
    /* setting the result to 0 maps to XCB_WM_STATE_WITHDRAWN which */
    /* causes a problem in scan. The default value should be XCB_WM_STATE_NORMAL */
    /* returning 0 inside pStateFound to indicate to the caller that */
    /* it was not found */
    uint32_t result = XCB_WM_STATE_NORMAL;

    if (pStateFound){
        *pStateFound = 0;
    }

    xcb_get_property_reply_t *prop_r;

    if((prop_r = xcb_get_property_reply(globalconf.connection, cookie, NULL)))
    {
        if(xcb_get_property_value_length(prop_r)){
            result = *(uint32_t *) xcb_get_property_value(prop_r);
            if (pStateFound){
                *pStateFound = 1;
            }
        }

        p_delete(&prop_r);
    }

    return result;
}

void QXcbScreen::updateGeometry(xcb_timestamp_t timestamp)
{
    if (connection()->hasXRandr()) {
        xcb_randr_get_crtc_info_reply_t *crtc = xcb_randr_get_crtc_info_reply(xcb_connection(),
            xcb_randr_get_crtc_info_unchecked(xcb_connection(), m_crtc, timestamp), NULL);
        if (crtc) {
            m_geometry = QRect(crtc->x, crtc->y, crtc->width, crtc->height);
            m_availableGeometry = m_geometry;
            free(crtc);
        }
    }

    xcb_get_property_reply_t * workArea =
        xcb_get_property_reply(xcb_connection(),
            xcb_get_property_unchecked(xcb_connection(), false, screen()->root,
                             atom(QXcbAtom::_NET_WORKAREA),
                             XCB_ATOM_CARDINAL, 0, 1024), NULL);

    if (workArea && workArea->type == XCB_ATOM_CARDINAL && workArea->format == 32 && workArea->value_len >= 4) {
        // If workArea->value_len > 4, the remaining ones seem to be for virtual desktops.
        // But QScreen doesn't know about that concept.  In reality there could be a
        // "docked" panel (with _NET_WM_STRUT_PARTIAL atom set) on just one desktop.
        // But for now just assume the first 4 values give us the geometry of the
        // "work area", AKA "available geometry"
        uint32_t *geom = (uint32_t*)xcb_get_property_value(workArea);
        QRect virtualAvailableGeometry(geom[0], geom[1], geom[2], geom[3]);
        // Take the intersection of the desktop's available geometry with this screen's geometry
        // to get the part of the available geometry which belongs to this screen.
        m_availableGeometry = m_geometry & virtualAvailableGeometry;
    }
    free(workArea);
}

xcb_window_t find_focused_window(xcb_connection_t *conn, const xcb_window_t root) {
    xcb_window_t result = XCB_NONE;

    _init_net_active_window(conn);

    xcb_get_property_reply_t *prop_reply = xcb_get_property_reply(
        conn,
        xcb_get_property_unchecked(
            conn, false, root, _NET_ACTIVE_WINDOW, XCB_GET_PROPERTY_TYPE_ANY, 0, 1 /* word */),
        NULL);
    if (prop_reply == NULL) {
        goto out;
    }
    if (xcb_get_property_value_length(prop_reply) == 0) {
        goto out_prop;
    }
    if (prop_reply->type != XCB_ATOM_WINDOW) {
        goto out_prop;
    }

    result = *((xcb_window_t *)xcb_get_property_value(prop_reply));

out_prop:
    free(prop_reply);
out:
    return result;
}

char *xcb_util_get_property(xcb_connection_t *conn, xcb_window_t window, xcb_atom_t atom,
        xcb_atom_t type, size_t size) {
    xcb_get_property_cookie_t cookie;
    xcb_get_property_reply_t *reply;
    xcb_generic_error_t *err;
    int reply_length;
    char *content;

    cookie = xcb_get_property(conn, 0, window, atom, type, 0, size);
    reply = xcb_get_property_reply(conn, cookie, &err);
    if (err != NULL) {
        FREE(err);
        return NULL;
    }

    if (reply == NULL || (reply_length = xcb_get_property_value_length(reply)) == 0) {
        FREE(reply);
        return NULL;
    }

    if (reply->bytes_after > 0) {
        size_t adjusted_size = size + ceil(reply->bytes_after / 4.0);
        FREE(reply);
        return xcb_util_get_property(conn, window, atom, type, adjusted_size);
    }

    if (asprintf(&content, "%.*s", reply_length, (char *)xcb_get_property_value(reply)) < 0) {
        FREE(reply);
        return NULL;
    }

    FREE(reply);
    return content;
}

/*
 * Updates the WM_WINDOW_ROLE
 *
 */
void window_update_role(i3Window *win, xcb_get_property_reply_t *prop, bool before_mgmt) {
    if (prop == NULL || xcb_get_property_value_length(prop) == 0) {
        DLOG("WM_WINDOW_ROLE not set.\n");
        FREE(prop);
        return;
    }

    char *new_role;
    if (asprintf(&new_role, "%.*s", xcb_get_property_value_length(prop),
                 (char *)xcb_get_property_value(prop)) == -1) {
        perror("asprintf()");
        DLOG("Could not get WM_WINDOW_ROLE\n");
        free(prop);
        return;
    }
    FREE(win->role);
    win->role = new_role;
    LOG("WM_WINDOW_ROLE changed to \"%s\"\n", win->role);

    if (before_mgmt) {
        free(prop);
        return;
    }

    run_assignments(win);

    free(prop);
}

/*
 * Find virtual roots (_NET_VIRTUAL_ROOTS)
 */
static xcb_window_t *
Find_Roots(xcb_connection_t * dpy, xcb_window_t root, unsigned int *num)
{
    xcb_atom_t atom_virtual_root;

    xcb_get_property_cookie_t prop_cookie;
    xcb_get_property_reply_t *prop_reply;

    xcb_window_t *prop_ret = NULL;

    *num = 0;

    atom_virtual_root = Get_Atom (dpy, "_NET_VIRTUAL_ROOTS");
    if (atom_virtual_root == XCB_ATOM_NONE)
        return NULL;

    prop_cookie = xcb_get_property (dpy, False, root, atom_virtual_root,
                                    XCB_ATOM_WINDOW, 0, 0x7fffffff);
    prop_reply = xcb_get_property_reply (dpy, prop_cookie, NULL);
    if (!prop_reply)
        return NULL;

    if ((prop_reply->value_len > 0) && (prop_reply->type == XCB_ATOM_WINDOW)
        && (prop_reply->format == 32)) {
        int length = xcb_get_property_value_length (prop_reply);
        prop_ret = malloc(length);
        if (prop_ret) {
            memcpy (prop_ret, xcb_get_property_value(prop_reply), length);
            *num = prop_reply->value_len;
        }
    }
    free (prop_reply);

    return prop_ret;
}

void
property_update_net_wm_pid(client_t *c,
                           xcb_get_property_reply_t *reply)
{
    bool no_reply = !reply;

    if(no_reply)
    {
        xcb_get_property_cookie_t prop_c =
            xcb_get_property_unchecked(globalconf.connection, false, c->window, _NET_WM_PID, XCB_ATOM_CARDINAL, 0L, 1L);
        reply = xcb_get_property_reply(globalconf.connection, prop_c, NULL);
    }

    if(reply && reply->value_len)
    {
        uint32_t *rdata = xcb_get_property_value(reply);
        if(rdata)
        {
            luaA_object_push(globalconf.L, c);
            client_set_pid(globalconf.L, -1, *rdata);
            lua_pop(globalconf.L, 1);
        }
    }

    if(no_reply)
        p_delete(&reply);
}

bool KWinKScreenHelperEffect::nativeEventFilter(const QByteArray &eventType, void *message, long int *result)
{
    Q_UNUSED(result);

    if (eventType != "xcb_generic_event_t") {
        return false;
    }

#ifdef HAVE_XCB
    if (m_isValid && QX11Info::isPlatformX11()) {
        auto e = static_cast<xcb_generic_event_t *>(message);
        const uint8_t type = e->response_type & ~0x80;
        if (type == XCB_PROPERTY_NOTIFY) {
            auto *event = reinterpret_cast<xcb_property_notify_event_t *>(e);
            if (event->window == QX11Info::appRootWindow()) {
                if (event->atom != m_atom) {
                    return false;
                }

                auto cookie = xcb_get_property(QX11Info::connection(), false, QX11Info::appRootWindow(), m_atom, XCB_ATOM_CARDINAL, 0, 1);
                QScopedPointer<xcb_get_property_reply_t, QScopedPointerPodDeleter> reply(xcb_get_property_reply(QX11Info::connection(), cookie, NULL));
                if (reply.isNull() || reply.data()->value_len != 1 || reply.data()->format != uint8_t(32)) {
                    return false;
                }

                auto *data = reinterpret_cast<uint32_t *>(xcb_get_property_value(reply.data()));
                if (!data) {
                    return false;
                }

                switch(*data) {
                case 1:
                    m_state = FadingOutState;
                    break;
                case 2:
                    m_state = FadedOutState;
                    if (m_running) {
                        Q_EMIT fadedOut();
                    }
                    break;
                case 3:
                    m_state = FadingInState;
                    m_running = false;
                    m_abortTimer.stop();
                    break;
                default:
                    m_state = NormalState;
                    m_running = false;
                }

                Q_EMIT stateChanged(m_state);
            }
        }
    }
#else
    Q_UNUSED(message);
#endif

    return false;
}

    QByteArray getSettings()
    {
        QXcbConnectionGrabber connectionGrabber(screen->connection());

        int offset = 0;
        QByteArray settings;
        xcb_atom_t _xsettings_atom = screen->connection()->atom(QXcbAtom::_XSETTINGS_SETTINGS);
        while (1) {
            xcb_get_property_cookie_t get_prop_cookie =
                    xcb_get_property_unchecked(screen->xcb_connection(),
                                               false,
                                               x_settings_window,
                                               _xsettings_atom,
                                               _xsettings_atom,
                                               offset/4,
                                               8192);
            xcb_get_property_reply_t *reply = xcb_get_property_reply(screen->xcb_connection(), get_prop_cookie, NULL);
            bool more = false;
            if (!reply)
                return settings;

            settings += QByteArray((const char *)xcb_get_property_value(reply), xcb_get_property_value_length(reply));
            offset += xcb_get_property_value_length(reply);
            more = reply->bytes_after != 0;

            free(reply);

            if (!more)
                break;
        }

        return settings;
    }

/*
 * Updates the name by using WM_NAME (encoded in COMPOUND_TEXT). We do not
 * touch what the client sends us but pass it to xcb_image_text_8. To get
 * proper unicode rendering, the application has to use _NET_WM_NAME (see
 * window_update_name()).
 *
 */
void window_update_name_legacy(i3Window *win, xcb_get_property_reply_t *prop, bool before_mgmt) {
    if (prop == NULL || xcb_get_property_value_length(prop) == 0) {
        DLOG("WM_NAME not set (_NET_WM_NAME is what you want anyways).\n");
        FREE(prop);
        return;
    }

    /* ignore update when the window is known to already have a UTF-8 name */
    if (win->uses_net_wm_name) {
        free(prop);
        return;
    }

    i3string_free(win->name);
    win->name = i3string_from_utf8_with_length(xcb_get_property_value(prop),
                                               xcb_get_property_value_length(prop));

    LOG("WM_NAME changed to \"%s\"\n", i3string_as_utf8(win->name));
    LOG("Using legacy window title. Note that in order to get Unicode window "
        "titles in i3, the application has to set _NET_WM_NAME (UTF-8)\n");

    win->name_x_changed = true;

    if (before_mgmt) {
        free(prop);
        return;
    }

    run_assignments(win);

    free(prop);
}