mutter/src/backends/x11/meta-backend-x11.c

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/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
/*
* Copyright (C) 2014 Red Hat
*
* 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, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*
* Written by:
* Jasper St. Pierre <jstpierre@mecheye.net>
*/
2018-10-19 03:15:54 -04:00
/**
* SECTION:meta-backend-x11
* @title: MetaBackendX11
* @short_description: A X11 MetaBackend
*
* MetaBackendX11 is an implementation of #MetaBackend using X and X
* extensions, like XInput and XKB.
*/
#include "config.h"
#include "backends/x11/meta-backend-x11.h"
#include <X11/XKBlib.h>
#include <X11/Xlib-xcb.h>
#include <X11/extensions/sync.h>
#include <stdlib.h>
#include <string.h>
#include <xkbcommon/xkbcommon-x11.h>
#include "backends/meta-idle-monitor-private.h"
#include "backends/meta-keymap-utils.h"
#include "backends/meta-stage-private.h"
#include "backends/x11/meta-clutter-backend-x11.h"
#include "backends/x11/meta-event-x11.h"
#include "backends/x11/meta-seat-x11.h"
#include "backends/x11/meta-stage-x11.h"
#include "backends/x11/meta-renderer-x11.h"
#include "backends/x11/meta-xkb-a11y-x11.h"
#include "clutter/clutter.h"
#include "compositor/compositor-private.h"
#include "core/display-private.h"
#include "meta/meta-cursor-tracker.h"
#include "meta/util.h"
struct _MetaBackendX11Private
{
/* The host X11 display */
Display *xdisplay;
Screen *xscreen;
xcb_connection_t *xcb;
GSource *source;
Window root_window;
int xsync_event_base;
int xsync_error_base;
XSyncAlarm user_active_alarm;
XSyncCounter counter;
x11: Limit touch replay pointer events to when replaying When a touch sequence was rejected, the emulated pointer events would be replayed with old timestamps. This caused issues with grabs as they would be ignored due to being too old. This was mitigated by making sure device event timestamps never travelled back in time by tampering with any event that had a timestamp seemingly in the past. This failed when the most recent timestamp that had been received were much older than the timestamp of the new event. This could for example happen when a session was left not interacted with for 40+ days or so; when interacted with again, as any new timestamp would according to XSERVER_TIME_IS_BEFORE() still be in the past compared to the "most recent" one. The effect is that we'd always use the `latest_evtime` for all new device events without ever updating it. The end result of this was that passive grabs would become active when interacted with, but would then newer be released, as the timestamps to XIAllowEvents() would out of date, resulting in the desktop effectively freezing, as the Shell would have an active pointer grab. To avoid the situation where we get stuck with an old `latest_evtime` timestamp, limit the tampering with device event timestamp to 1) only pointer events, and 2) only during the replay sequence. The second part is implemented by sending an asynchronous message via the X server after rejecting a touch sequence, only potentially tampering with the device event timestamps until the reply. This should avoid the stuck timestamp as in those situations, we'll always have a relatively up to date `latest_evtime` meaning XSERVER_TIME_IS_BEFORE() will not get confused. https://gitlab.gnome.org/GNOME/mutter/merge_requests/886
2019-10-25 04:06:55 -04:00
int current_touch_replay_sync_serial;
int pending_touch_replay_sync_serial;
Atom touch_replay_sync_atom;
int xinput_opcode;
int xinput_event_base;
int xinput_error_base;
Time latest_evtime;
uint8_t xkb_event_base;
uint8_t xkb_error_base;
gulong keymap_state_changed_id;
struct xkb_keymap *keymap;
xkb_layout_index_t keymap_layout_group;
MetaLogicalMonitor *cached_current_logical_monitor;
};
typedef struct _MetaBackendX11Private MetaBackendX11Private;
static GInitableIface *initable_parent_iface;
static void
initable_iface_init (GInitableIface *initable_iface);
G_DEFINE_TYPE_WITH_CODE (MetaBackendX11, meta_backend_x11, META_TYPE_BACKEND,
G_ADD_PRIVATE (MetaBackendX11)
G_IMPLEMENT_INTERFACE (G_TYPE_INITABLE,
initable_iface_init));
static void
uint64_to_xsync_value (uint64_t value,
XSyncValue *xsync_value)
{
XSyncIntsToValue (xsync_value, value & 0xffffffff, value >> 32);
}
static XSyncAlarm
xsync_user_active_alarm_set (MetaBackendX11Private *priv)
{
XSyncAlarmAttributes attr;
XSyncValue delta;
unsigned long flags;
flags = (XSyncCACounter | XSyncCAValueType | XSyncCATestType |
XSyncCAValue | XSyncCADelta | XSyncCAEvents);
XSyncIntToValue (&delta, 0);
attr.trigger.counter = priv->counter;
attr.trigger.value_type = XSyncAbsolute;
attr.delta = delta;
attr.events = TRUE;
uint64_to_xsync_value (1, &attr.trigger.wait_value);
attr.trigger.test_type = XSyncNegativeTransition;
return XSyncCreateAlarm (priv->xdisplay, flags, &attr);
}
static XSyncCounter
find_idletime_counter (MetaBackendX11Private *priv)
{
int i;
int n_counters;
XSyncSystemCounter *counters;
XSyncCounter counter = None;
counters = XSyncListSystemCounters (priv->xdisplay, &n_counters);
for (i = 0; i < n_counters; i++)
{
if (g_strcmp0 (counters[i].name, "IDLETIME") == 0)
{
counter = counters[i].counter;
break;
}
}
XSyncFreeSystemCounterList (counters);
return counter;
}
static void
handle_alarm_notify (MetaBackend *backend,
XSyncAlarmNotifyEvent *alarm_event)
{
MetaBackendX11 *x11 = META_BACKEND_X11 (backend);
MetaBackendX11Private *priv = meta_backend_x11_get_instance_private (x11);
MetaIdleMonitor *idle_monitor;
XSyncAlarmAttributes attr;
ClutterBackend *clutter_backend;
ClutterSeat *seat;
ClutterInputDevice *pointer;
if (alarm_event->state != XSyncAlarmActive ||
alarm_event->alarm != priv->user_active_alarm)
return;
attr.events = TRUE;
XSyncChangeAlarm (priv->xdisplay, priv->user_active_alarm,
XSyncCAEvents, &attr);
clutter_backend = meta_backend_get_clutter_backend (backend);
seat = clutter_backend_get_default_seat (clutter_backend);
pointer = clutter_seat_get_pointer (seat);
idle_monitor = meta_backend_get_idle_monitor (backend, pointer);
meta_idle_monitor_reset_idletime (idle_monitor);
}
static void
meta_backend_x11_translate_device_event (MetaBackendX11 *x11,
XIDeviceEvent *device_event)
{
MetaBackendX11Class *backend_x11_class =
META_BACKEND_X11_GET_CLASS (x11);
backend_x11_class->translate_device_event (x11, device_event);
}
x11: Limit touch replay pointer events to when replaying When a touch sequence was rejected, the emulated pointer events would be replayed with old timestamps. This caused issues with grabs as they would be ignored due to being too old. This was mitigated by making sure device event timestamps never travelled back in time by tampering with any event that had a timestamp seemingly in the past. This failed when the most recent timestamp that had been received were much older than the timestamp of the new event. This could for example happen when a session was left not interacted with for 40+ days or so; when interacted with again, as any new timestamp would according to XSERVER_TIME_IS_BEFORE() still be in the past compared to the "most recent" one. The effect is that we'd always use the `latest_evtime` for all new device events without ever updating it. The end result of this was that passive grabs would become active when interacted with, but would then newer be released, as the timestamps to XIAllowEvents() would out of date, resulting in the desktop effectively freezing, as the Shell would have an active pointer grab. To avoid the situation where we get stuck with an old `latest_evtime` timestamp, limit the tampering with device event timestamp to 1) only pointer events, and 2) only during the replay sequence. The second part is implemented by sending an asynchronous message via the X server after rejecting a touch sequence, only potentially tampering with the device event timestamps until the reply. This should avoid the stuck timestamp as in those situations, we'll always have a relatively up to date `latest_evtime` meaning XSERVER_TIME_IS_BEFORE() will not get confused. https://gitlab.gnome.org/GNOME/mutter/merge_requests/886
2019-10-25 04:06:55 -04:00
static void
maybe_translate_touch_replay_pointer_event (MetaBackendX11 *x11,
XIDeviceEvent *device_event)
{
MetaBackendX11Private *priv = meta_backend_x11_get_instance_private (x11);
if (!device_event->send_event &&
device_event->time != META_CURRENT_TIME &&
priv->current_touch_replay_sync_serial !=
priv->pending_touch_replay_sync_serial &&
XSERVER_TIME_IS_BEFORE (device_event->time, priv->latest_evtime))
{
/* Emulated pointer events received after XIRejectTouch is received
* on a passive touch grab will contain older timestamps, update those
* so we dont get InvalidTime at grabs.
*/
device_event->time = priv->latest_evtime;
}
}
static void
translate_device_event (MetaBackendX11 *x11,
XIDeviceEvent *device_event)
{
MetaBackendX11Private *priv = meta_backend_x11_get_instance_private (x11);
meta_backend_x11_translate_device_event (x11, device_event);
if (!device_event->send_event && device_event->time != META_CURRENT_TIME)
x11: Limit touch replay pointer events to when replaying When a touch sequence was rejected, the emulated pointer events would be replayed with old timestamps. This caused issues with grabs as they would be ignored due to being too old. This was mitigated by making sure device event timestamps never travelled back in time by tampering with any event that had a timestamp seemingly in the past. This failed when the most recent timestamp that had been received were much older than the timestamp of the new event. This could for example happen when a session was left not interacted with for 40+ days or so; when interacted with again, as any new timestamp would according to XSERVER_TIME_IS_BEFORE() still be in the past compared to the "most recent" one. The effect is that we'd always use the `latest_evtime` for all new device events without ever updating it. The end result of this was that passive grabs would become active when interacted with, but would then newer be released, as the timestamps to XIAllowEvents() would out of date, resulting in the desktop effectively freezing, as the Shell would have an active pointer grab. To avoid the situation where we get stuck with an old `latest_evtime` timestamp, limit the tampering with device event timestamp to 1) only pointer events, and 2) only during the replay sequence. The second part is implemented by sending an asynchronous message via the X server after rejecting a touch sequence, only potentially tampering with the device event timestamps until the reply. This should avoid the stuck timestamp as in those situations, we'll always have a relatively up to date `latest_evtime` meaning XSERVER_TIME_IS_BEFORE() will not get confused. https://gitlab.gnome.org/GNOME/mutter/merge_requests/886
2019-10-25 04:06:55 -04:00
priv->latest_evtime = device_event->time;
}
static void
meta_backend_x11_translate_crossing_event (MetaBackendX11 *x11,
XIEnterEvent *enter_event)
{
MetaBackendX11Class *backend_x11_class =
META_BACKEND_X11_GET_CLASS (x11);
if (backend_x11_class->translate_crossing_event)
backend_x11_class->translate_crossing_event (x11, enter_event);
}
static void
translate_crossing_event (MetaBackendX11 *x11,
XIEnterEvent *enter_event)
{
/* Throw out weird events generated by grabs. */
if (enter_event->mode == XINotifyGrab ||
enter_event->mode == XINotifyUngrab)
{
enter_event->event = None;
return;
}
meta_backend_x11_translate_crossing_event (x11, enter_event);
}
/* Clutter makes the assumption that there is only one X window
* per stage, which is a valid assumption to make for a generic
* application toolkit. As such, it will ignore any events sent
* to the a stage that isn't its X window.
*
* When running as an X window manager, we need to respond to
* events from lots of windows. Trick Clutter into translating
* these events by pretending we got an event on the stage window.
*/
static void
maybe_spoof_event_as_stage_event (MetaBackendX11 *x11,
XIEvent *input_event)
{
switch (input_event->evtype)
{
case XI_Motion:
case XI_ButtonPress:
case XI_ButtonRelease:
x11: Limit touch replay pointer events to when replaying When a touch sequence was rejected, the emulated pointer events would be replayed with old timestamps. This caused issues with grabs as they would be ignored due to being too old. This was mitigated by making sure device event timestamps never travelled back in time by tampering with any event that had a timestamp seemingly in the past. This failed when the most recent timestamp that had been received were much older than the timestamp of the new event. This could for example happen when a session was left not interacted with for 40+ days or so; when interacted with again, as any new timestamp would according to XSERVER_TIME_IS_BEFORE() still be in the past compared to the "most recent" one. The effect is that we'd always use the `latest_evtime` for all new device events without ever updating it. The end result of this was that passive grabs would become active when interacted with, but would then newer be released, as the timestamps to XIAllowEvents() would out of date, resulting in the desktop effectively freezing, as the Shell would have an active pointer grab. To avoid the situation where we get stuck with an old `latest_evtime` timestamp, limit the tampering with device event timestamp to 1) only pointer events, and 2) only during the replay sequence. The second part is implemented by sending an asynchronous message via the X server after rejecting a touch sequence, only potentially tampering with the device event timestamps until the reply. This should avoid the stuck timestamp as in those situations, we'll always have a relatively up to date `latest_evtime` meaning XSERVER_TIME_IS_BEFORE() will not get confused. https://gitlab.gnome.org/GNOME/mutter/merge_requests/886
2019-10-25 04:06:55 -04:00
maybe_translate_touch_replay_pointer_event (x11,
(XIDeviceEvent *) input_event);
G_GNUC_FALLTHROUGH;
case XI_KeyPress:
case XI_KeyRelease:
case XI_TouchBegin:
case XI_TouchUpdate:
case XI_TouchEnd:
translate_device_event (x11, (XIDeviceEvent *) input_event);
break;
case XI_Enter:
case XI_Leave:
translate_crossing_event (x11, (XIEnterEvent *) input_event);
break;
default:
break;
}
}
static void
handle_input_event (MetaBackendX11 *x11,
XEvent *event)
{
MetaBackendX11Private *priv = meta_backend_x11_get_instance_private (x11);
if (event->type == GenericEvent &&
event->xcookie.extension == priv->xinput_opcode)
{
XIEvent *input_event = (XIEvent *) event->xcookie.data;
maybe_spoof_event_as_stage_event (x11, input_event);
}
}
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static void
keymap_changed (MetaBackend *backend)
{
MetaBackendX11 *x11 = META_BACKEND_X11 (backend);
MetaBackendX11Private *priv = meta_backend_x11_get_instance_private (x11);
if (priv->keymap)
{
xkb_keymap_unref (priv->keymap);
priv->keymap = NULL;
}
g_signal_emit_by_name (backend, "keymap-changed", 0);
}
static gboolean
meta_backend_x11_handle_host_xevent (MetaBackendX11 *backend_x11,
XEvent *event)
{
MetaBackendX11Class *backend_x11_class =
META_BACKEND_X11_GET_CLASS (backend_x11);
return backend_x11_class->handle_host_xevent (backend_x11, event);
}
static void
handle_host_xevent (MetaBackend *backend,
XEvent *event)
{
MetaBackendX11 *x11 = META_BACKEND_X11 (backend);
MetaBackendX11Private *priv = meta_backend_x11_get_instance_private (x11);
gboolean bypass_clutter = FALSE;
MetaDisplay *display;
x11: Limit touch replay pointer events to when replaying When a touch sequence was rejected, the emulated pointer events would be replayed with old timestamps. This caused issues with grabs as they would be ignored due to being too old. This was mitigated by making sure device event timestamps never travelled back in time by tampering with any event that had a timestamp seemingly in the past. This failed when the most recent timestamp that had been received were much older than the timestamp of the new event. This could for example happen when a session was left not interacted with for 40+ days or so; when interacted with again, as any new timestamp would according to XSERVER_TIME_IS_BEFORE() still be in the past compared to the "most recent" one. The effect is that we'd always use the `latest_evtime` for all new device events without ever updating it. The end result of this was that passive grabs would become active when interacted with, but would then newer be released, as the timestamps to XIAllowEvents() would out of date, resulting in the desktop effectively freezing, as the Shell would have an active pointer grab. To avoid the situation where we get stuck with an old `latest_evtime` timestamp, limit the tampering with device event timestamp to 1) only pointer events, and 2) only during the replay sequence. The second part is implemented by sending an asynchronous message via the X server after rejecting a touch sequence, only potentially tampering with the device event timestamps until the reply. This should avoid the stuck timestamp as in those situations, we'll always have a relatively up to date `latest_evtime` meaning XSERVER_TIME_IS_BEFORE() will not get confused. https://gitlab.gnome.org/GNOME/mutter/merge_requests/886
2019-10-25 04:06:55 -04:00
switch (event->type)
{
case ClientMessage:
if (event->xclient.window == meta_backend_x11_get_xwindow (x11) &&
event->xclient.message_type == priv->touch_replay_sync_atom)
priv->current_touch_replay_sync_serial = event->xclient.data.l[0];
break;
default:
break;
}
XGetEventData (priv->xdisplay, &event->xcookie);
display = meta_get_display ();
if (display)
{
MetaCompositor *compositor = display->compositor;
MetaPluginManager *plugin_mgr =
meta_compositor_get_plugin_manager (compositor);
if (meta_plugin_manager_xevent_filter (plugin_mgr, event))
bypass_clutter = TRUE;
}
bypass_clutter = (meta_backend_x11_handle_host_xevent (x11, event) ||
bypass_clutter);
if (event->type == (priv->xsync_event_base + XSyncAlarmNotify))
handle_alarm_notify (backend, (XSyncAlarmNotifyEvent *) event);
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if (event->type == priv->xkb_event_base)
{
XkbEvent *xkb_ev = (XkbEvent *) event;
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if (xkb_ev->any.device == META_VIRTUAL_CORE_KEYBOARD_ID)
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{
switch (xkb_ev->any.xkb_type)
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{
case XkbNewKeyboardNotify:
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case XkbMapNotify:
keymap_changed (backend);
break;
case XkbStateNotify:
if (xkb_ev->state.changed & XkbGroupLockMask)
{
int layout_group;
gboolean layout_group_changed;
layout_group = xkb_ev->state.locked_group;
layout_group_changed =
(int) priv->keymap_layout_group != layout_group;
priv->keymap_layout_group = layout_group;
if (layout_group_changed)
meta_backend_notify_keymap_layout_group_changed (backend,
layout_group);
}
break;
2014-08-14 17:32:41 -04:00
default:
break;
}
}
}
if (!bypass_clutter)
{
handle_input_event (x11, event);
meta_x11_handle_event (backend, event);
}
XFreeEventData (priv->xdisplay, &event->xcookie);
}
typedef struct {
GSource base;
GPollFD event_poll_fd;
MetaBackend *backend;
} XEventSource;
static gboolean
x_event_source_prepare (GSource *source,
int *timeout)
{
XEventSource *x_source = (XEventSource *) source;
MetaBackend *backend = x_source->backend;
MetaBackendX11 *x11 = META_BACKEND_X11 (backend);
MetaBackendX11Private *priv = meta_backend_x11_get_instance_private (x11);
*timeout = -1;
return XPending (priv->xdisplay);
}
static gboolean
x_event_source_check (GSource *source)
{
XEventSource *x_source = (XEventSource *) source;
MetaBackend *backend = x_source->backend;
MetaBackendX11 *x11 = META_BACKEND_X11 (backend);
MetaBackendX11Private *priv = meta_backend_x11_get_instance_private (x11);
return XPending (priv->xdisplay);
}
static gboolean
x_event_source_dispatch (GSource *source,
GSourceFunc callback,
gpointer user_data)
{
XEventSource *x_source = (XEventSource *) source;
MetaBackend *backend = x_source->backend;
MetaBackendX11 *x11 = META_BACKEND_X11 (backend);
MetaBackendX11Private *priv = meta_backend_x11_get_instance_private (x11);
while (XPending (priv->xdisplay))
{
XEvent event;
XNextEvent (priv->xdisplay, &event);
handle_host_xevent (backend, &event);
}
return TRUE;
}
static GSourceFuncs x_event_funcs = {
x_event_source_prepare,
x_event_source_check,
x_event_source_dispatch,
};
static GSource *
x_event_source_new (MetaBackend *backend)
{
MetaBackendX11 *x11 = META_BACKEND_X11 (backend);
MetaBackendX11Private *priv = meta_backend_x11_get_instance_private (x11);
GSource *source;
XEventSource *x_source;
source = g_source_new (&x_event_funcs, sizeof (XEventSource));
g_source_set_name (source, "[mutter] X events");
x_source = (XEventSource *) source;
x_source->backend = backend;
x_source->event_poll_fd.fd = ConnectionNumber (priv->xdisplay);
x_source->event_poll_fd.events = G_IO_IN;
g_source_add_poll (source, &x_source->event_poll_fd);
g_source_attach (source, NULL);
return source;
}
static void
on_monitors_changed (MetaMonitorManager *manager,
MetaBackend *backend)
{
MetaBackendX11 *x11 = META_BACKEND_X11 (backend);
MetaBackendX11Private *priv = meta_backend_x11_get_instance_private (x11);
priv->cached_current_logical_monitor = NULL;
}
static void
on_kbd_a11y_changed (MetaInputSettings *input_settings,
MetaKbdA11ySettings *a11y_settings,
MetaBackend *backend)
{
ClutterBackend *clutter_backend = meta_backend_get_clutter_backend (backend);
ClutterSeat *seat = clutter_backend_get_default_seat (clutter_backend);
meta_seat_x11_apply_kbd_a11y_settings (seat, a11y_settings);
}
static void
meta_backend_x11_post_init (MetaBackend *backend)
{
MetaBackendX11 *x11 = META_BACKEND_X11 (backend);
MetaBackendX11Private *priv = meta_backend_x11_get_instance_private (x11);
MetaMonitorManager *monitor_manager;
ClutterBackend *clutter_backend;
ClutterSeat *seat;
MetaInputSettings *input_settings;
int major, minor;
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gboolean has_xi = FALSE;
priv->source = x_event_source_new (backend);
if (!XSyncQueryExtension (priv->xdisplay, &priv->xsync_event_base, &priv->xsync_error_base) ||
!XSyncInitialize (priv->xdisplay, &major, &minor))
meta_fatal ("Could not initialize XSync");
priv->counter = find_idletime_counter (priv);
if (priv->counter == None)
meta_fatal ("Could not initialize XSync counter");
priv->user_active_alarm = xsync_user_active_alarm_set (priv);
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if (XQueryExtension (priv->xdisplay,
"XInputExtension",
&priv->xinput_opcode,
&priv->xinput_error_base,
&priv->xinput_event_base))
{
major = 2; minor = 3;
if (XIQueryVersion (priv->xdisplay, &major, &minor) == Success)
{
int version = (major * 10) + minor;
if (version >= 22)
has_xi = TRUE;
}
}
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if (!has_xi)
meta_fatal ("X server doesn't have the XInput extension, version 2.2 or newer");
if (!xkb_x11_setup_xkb_extension (priv->xcb,
XKB_X11_MIN_MAJOR_XKB_VERSION,
XKB_X11_MIN_MINOR_XKB_VERSION,
XKB_X11_SETUP_XKB_EXTENSION_NO_FLAGS,
NULL, NULL,
&priv->xkb_event_base,
&priv->xkb_error_base))
meta_fatal ("X server doesn't have the XKB extension, version %d.%d or newer",
XKB_X11_MIN_MAJOR_XKB_VERSION, XKB_X11_MIN_MINOR_XKB_VERSION);
META_BACKEND_CLASS (meta_backend_x11_parent_class)->post_init (backend);
monitor_manager = meta_backend_get_monitor_manager (backend);
g_signal_connect (monitor_manager, "monitors-changed-internal",
G_CALLBACK (on_monitors_changed), backend);
x11: Limit touch replay pointer events to when replaying When a touch sequence was rejected, the emulated pointer events would be replayed with old timestamps. This caused issues with grabs as they would be ignored due to being too old. This was mitigated by making sure device event timestamps never travelled back in time by tampering with any event that had a timestamp seemingly in the past. This failed when the most recent timestamp that had been received were much older than the timestamp of the new event. This could for example happen when a session was left not interacted with for 40+ days or so; when interacted with again, as any new timestamp would according to XSERVER_TIME_IS_BEFORE() still be in the past compared to the "most recent" one. The effect is that we'd always use the `latest_evtime` for all new device events without ever updating it. The end result of this was that passive grabs would become active when interacted with, but would then newer be released, as the timestamps to XIAllowEvents() would out of date, resulting in the desktop effectively freezing, as the Shell would have an active pointer grab. To avoid the situation where we get stuck with an old `latest_evtime` timestamp, limit the tampering with device event timestamp to 1) only pointer events, and 2) only during the replay sequence. The second part is implemented by sending an asynchronous message via the X server after rejecting a touch sequence, only potentially tampering with the device event timestamps until the reply. This should avoid the stuck timestamp as in those situations, we'll always have a relatively up to date `latest_evtime` meaning XSERVER_TIME_IS_BEFORE() will not get confused. https://gitlab.gnome.org/GNOME/mutter/merge_requests/886
2019-10-25 04:06:55 -04:00
priv->touch_replay_sync_atom = XInternAtom (priv->xdisplay,
"_MUTTER_TOUCH_SEQUENCE_SYNC",
False);
clutter_backend = meta_backend_get_clutter_backend (backend);
seat = clutter_backend_get_default_seat (clutter_backend);
meta_seat_x11_notify_devices (META_SEAT_X11 (seat),
CLUTTER_STAGE (meta_backend_get_stage (backend)));
input_settings = meta_backend_get_input_settings (backend);
if (input_settings)
{
g_signal_connect_object (meta_backend_get_input_settings (backend),
"kbd-a11y-changed",
G_CALLBACK (on_kbd_a11y_changed), backend, 0);
if (meta_input_settings_maybe_restore_numlock_state (input_settings))
{
unsigned int num_mask;
num_mask = XkbKeysymToModifiers (priv->xdisplay, XK_Num_Lock);
XkbLockModifiers (priv->xdisplay, XkbUseCoreKbd, num_mask, num_mask);
}
}
}
static ClutterBackend *
meta_backend_x11_create_clutter_backend (MetaBackend *backend)
{
return CLUTTER_BACKEND (meta_clutter_backend_x11_new (backend));
}
static ClutterSeat *
meta_backend_x11_create_default_seat (MetaBackend *backend,
GError **error)
{
MetaBackendX11 *x11 = META_BACKEND_X11 (backend);
MetaBackendX11Private *priv = meta_backend_x11_get_instance_private (x11);
int event_base, first_event, first_error;
int major, minor;
MetaSeatX11 *seat_x11;
if (!XQueryExtension (priv->xdisplay,
"XInputExtension",
&event_base,
&first_event,
&first_error))
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
"Failed to query XInputExtension");
return NULL;
}
major = 2;
minor = 3;
if (XIQueryVersion (priv->xdisplay, &major, &minor) == BadRequest)
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
"Incompatible XInputExtension version");
return NULL;
}
seat_x11 = meta_seat_x11_new (backend,
event_base,
META_VIRTUAL_CORE_POINTER_ID,
META_VIRTUAL_CORE_KEYBOARD_ID);
return CLUTTER_SEAT (seat_x11);
}
static gboolean
meta_backend_x11_grab_device (MetaBackend *backend,
int device_id,
uint32_t timestamp)
{
MetaBackendX11 *x11 = META_BACKEND_X11 (backend);
MetaBackendX11Private *priv = meta_backend_x11_get_instance_private (x11);
unsigned char mask_bits[XIMaskLen (XI_LASTEVENT)] = { 0 };
XIEventMask mask = { XIAllMasterDevices, sizeof (mask_bits), mask_bits };
int ret;
if (timestamp != META_CURRENT_TIME &&
XSERVER_TIME_IS_BEFORE (timestamp, priv->latest_evtime))
timestamp = priv->latest_evtime;
XISetMask (mask.mask, XI_ButtonPress);
XISetMask (mask.mask, XI_ButtonRelease);
XISetMask (mask.mask, XI_Enter);
XISetMask (mask.mask, XI_Leave);
XISetMask (mask.mask, XI_Motion);
XISetMask (mask.mask, XI_KeyPress);
XISetMask (mask.mask, XI_KeyRelease);
ret = XIGrabDevice (priv->xdisplay, device_id,
2014-04-27 10:49:29 -04:00
meta_backend_x11_get_xwindow (x11),
timestamp,
None,
XIGrabModeAsync, XIGrabModeAsync,
False, /* owner_events */
&mask);
return (ret == Success);
}
static gboolean
meta_backend_x11_ungrab_device (MetaBackend *backend,
int device_id,
uint32_t timestamp)
{
MetaBackendX11 *x11 = META_BACKEND_X11 (backend);
MetaBackendX11Private *priv = meta_backend_x11_get_instance_private (x11);
int ret;
ret = XIUngrabDevice (priv->xdisplay, device_id, timestamp);
XFlush (priv->xdisplay);
return (ret == Success);
}
static void
meta_backend_x11_finish_touch_sequence (MetaBackend *backend,
ClutterEventSequence *sequence,
MetaSequenceState state)
{
MetaBackendX11 *x11 = META_BACKEND_X11 (backend);
MetaBackendX11Private *priv = meta_backend_x11_get_instance_private (x11);
int event_mode;
if (state == META_SEQUENCE_ACCEPTED)
event_mode = XIAcceptTouch;
else if (state == META_SEQUENCE_REJECTED)
event_mode = XIRejectTouch;
else
g_return_if_reached ();
XIAllowTouchEvents (priv->xdisplay,
META_VIRTUAL_CORE_POINTER_ID,
clutter_event_sequence_get_slot (sequence),
DefaultRootWindow (priv->xdisplay), event_mode);
x11: Limit touch replay pointer events to when replaying When a touch sequence was rejected, the emulated pointer events would be replayed with old timestamps. This caused issues with grabs as they would be ignored due to being too old. This was mitigated by making sure device event timestamps never travelled back in time by tampering with any event that had a timestamp seemingly in the past. This failed when the most recent timestamp that had been received were much older than the timestamp of the new event. This could for example happen when a session was left not interacted with for 40+ days or so; when interacted with again, as any new timestamp would according to XSERVER_TIME_IS_BEFORE() still be in the past compared to the "most recent" one. The effect is that we'd always use the `latest_evtime` for all new device events without ever updating it. The end result of this was that passive grabs would become active when interacted with, but would then newer be released, as the timestamps to XIAllowEvents() would out of date, resulting in the desktop effectively freezing, as the Shell would have an active pointer grab. To avoid the situation where we get stuck with an old `latest_evtime` timestamp, limit the tampering with device event timestamp to 1) only pointer events, and 2) only during the replay sequence. The second part is implemented by sending an asynchronous message via the X server after rejecting a touch sequence, only potentially tampering with the device event timestamps until the reply. This should avoid the stuck timestamp as in those situations, we'll always have a relatively up to date `latest_evtime` meaning XSERVER_TIME_IS_BEFORE() will not get confused. https://gitlab.gnome.org/GNOME/mutter/merge_requests/886
2019-10-25 04:06:55 -04:00
if (state == META_SEQUENCE_REJECTED)
{
XClientMessageEvent ev;
ev = (XClientMessageEvent) {
.type = ClientMessage,
.window = meta_backend_x11_get_xwindow (x11),
.message_type = priv->touch_replay_sync_atom,
.format = 32,
.data.l[0] = ++priv->pending_touch_replay_sync_serial,
};
XSendEvent (priv->xdisplay, meta_backend_x11_get_xwindow (x11),
False, 0, (XEvent *) &ev);
}
}
static MetaLogicalMonitor *
meta_backend_x11_get_current_logical_monitor (MetaBackend *backend)
{
MetaBackendX11 *x11 = META_BACKEND_X11 (backend);
MetaBackendX11Private *priv = meta_backend_x11_get_instance_private (x11);
MetaCursorTracker *cursor_tracker;
graphene_point_t point;
MetaMonitorManager *monitor_manager;
MetaLogicalMonitor *logical_monitor;
if (priv->cached_current_logical_monitor)
return priv->cached_current_logical_monitor;
cursor_tracker = meta_backend_get_cursor_tracker (backend);
meta_cursor_tracker_get_pointer (cursor_tracker, &point, NULL);
monitor_manager = meta_backend_get_monitor_manager (backend);
logical_monitor =
meta_monitor_manager_get_logical_monitor_at (monitor_manager,
point.x, point.y);
if (!logical_monitor && monitor_manager->logical_monitors)
logical_monitor = monitor_manager->logical_monitors->data;
priv->cached_current_logical_monitor = logical_monitor;
return priv->cached_current_logical_monitor;
}
static struct xkb_keymap *
meta_backend_x11_get_keymap (MetaBackend *backend)
{
MetaBackendX11 *x11 = META_BACKEND_X11 (backend);
MetaBackendX11Private *priv = meta_backend_x11_get_instance_private (x11);
if (priv->keymap == NULL)
{
struct xkb_context *context = meta_create_xkb_context ();
priv->keymap = xkb_x11_keymap_new_from_device (context,
priv->xcb,
xkb_x11_get_core_keyboard_device_id (priv->xcb),
XKB_KEYMAP_COMPILE_NO_FLAGS);
if (priv->keymap == NULL)
priv->keymap = xkb_keymap_new_from_names (context, NULL, XKB_KEYMAP_COMPILE_NO_FLAGS);
xkb_context_unref (context);
}
return priv->keymap;
}
static xkb_layout_index_t
meta_backend_x11_get_keymap_layout_group (MetaBackend *backend)
{
MetaBackendX11 *x11 = META_BACKEND_X11 (backend);
MetaBackendX11Private *priv = meta_backend_x11_get_instance_private (x11);
return priv->keymap_layout_group;
}
void
meta_backend_x11_handle_event (MetaBackendX11 *x11,
XEvent *xevent)
{
MetaBackendX11Private *priv = meta_backend_x11_get_instance_private (x11);
priv->cached_current_logical_monitor = NULL;
}
uint8_t
meta_backend_x11_get_xkb_event_base (MetaBackendX11 *x11)
{
MetaBackendX11Private *priv = meta_backend_x11_get_instance_private (x11);
return priv->xkb_event_base;
}
static void
init_xkb_state (MetaBackendX11 *x11)
{
MetaBackendX11Private *priv = meta_backend_x11_get_instance_private (x11);
struct xkb_keymap *keymap;
int32_t device_id;
struct xkb_state *state;
keymap = meta_backend_get_keymap (META_BACKEND (x11));
device_id = xkb_x11_get_core_keyboard_device_id (priv->xcb);
state = xkb_x11_state_new_from_device (keymap, priv->xcb, device_id);
priv->keymap_layout_group =
xkb_state_serialize_layout (state, XKB_STATE_LAYOUT_LOCKED);
xkb_state_unref (state);
}
static gboolean
meta_backend_x11_initable_init (GInitable *initable,
GCancellable *cancellable,
GError **error)
{
MetaBackendX11 *x11 = META_BACKEND_X11 (initable);
MetaBackendX11Private *priv = meta_backend_x11_get_instance_private (x11);
Display *xdisplay;
const char *xdisplay_name;
xdisplay_name = g_getenv ("DISPLAY");
if (!xdisplay_name)
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
"Unable to open display, DISPLAY not set");
return FALSE;
}
xdisplay = XOpenDisplay (xdisplay_name);
if (!xdisplay)
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
"Unable to open display '%s'", xdisplay_name);
return FALSE;
}
priv->xdisplay = xdisplay;
priv->xscreen = DefaultScreenOfDisplay (xdisplay);
priv->xcb = XGetXCBConnection (priv->xdisplay);
priv->root_window = DefaultRootWindow (xdisplay);
init_xkb_state (x11);
return initable_parent_iface->init (initable, cancellable, error);
}
static void
initable_iface_init (GInitableIface *initable_iface)
{
initable_parent_iface = g_type_interface_peek_parent (initable_iface);
initable_iface->init = meta_backend_x11_initable_init;
}
static void
meta_backend_x11_dispose (GObject *object)
{
MetaBackend *backend = META_BACKEND (object);
MetaBackendX11 *x11 = META_BACKEND_X11 (object);
MetaBackendX11Private *priv = meta_backend_x11_get_instance_private (x11);
if (priv->keymap_state_changed_id)
{
ClutterBackend *clutter_backend = meta_backend_get_clutter_backend (backend);
ClutterSeat *seat = clutter_backend_get_default_seat (clutter_backend);
ClutterKeymap *keymap;
seat = clutter_backend_get_default_seat (clutter_backend);
keymap = clutter_seat_get_keymap (seat);
g_clear_signal_handler (&priv->keymap_state_changed_id, keymap);
}
if (priv->user_active_alarm != None)
{
XSyncDestroyAlarm (priv->xdisplay, priv->user_active_alarm);
priv->user_active_alarm = None;
}
G_OBJECT_CLASS (meta_backend_x11_parent_class)->dispose (object);
}
static void
meta_backend_x11_finalize (GObject *object)
{
MetaBackendX11 *x11 = META_BACKEND_X11 (object);
MetaBackendX11Private *priv = meta_backend_x11_get_instance_private (x11);
g_clear_pointer (&priv->keymap, xkb_keymap_unref);
G_OBJECT_CLASS (meta_backend_x11_parent_class)->finalize (object);
}
static void
meta_backend_x11_class_init (MetaBackendX11Class *klass)
{
MetaBackendClass *backend_class = META_BACKEND_CLASS (klass);
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->dispose = meta_backend_x11_dispose;
object_class->finalize = meta_backend_x11_finalize;
backend_class->create_clutter_backend = meta_backend_x11_create_clutter_backend;
backend_class->create_default_seat = meta_backend_x11_create_default_seat;
backend_class->post_init = meta_backend_x11_post_init;
backend_class->grab_device = meta_backend_x11_grab_device;
backend_class->ungrab_device = meta_backend_x11_ungrab_device;
backend_class->finish_touch_sequence = meta_backend_x11_finish_touch_sequence;
backend_class->get_current_logical_monitor = meta_backend_x11_get_current_logical_monitor;
backend_class->get_keymap = meta_backend_x11_get_keymap;
backend_class->get_keymap_layout_group = meta_backend_x11_get_keymap_layout_group;
}
static void
meta_backend_x11_init (MetaBackendX11 *x11)
{
XInitThreads ();
}
Display *
meta_backend_x11_get_xdisplay (MetaBackendX11 *x11)
{
MetaBackendX11Private *priv = meta_backend_x11_get_instance_private (x11);
return priv->xdisplay;
}
Screen *
meta_backend_x11_get_xscreen (MetaBackendX11 *x11)
{
MetaBackendX11Private *priv = meta_backend_x11_get_instance_private (x11);
return priv->xscreen;
}
Window
meta_backend_x11_get_root_xwindow (MetaBackendX11 *backend_x11)
{
MetaBackendX11Private *priv =
meta_backend_x11_get_instance_private (backend_x11);
return priv->root_window;
}
2014-04-27 10:49:29 -04:00
Window
meta_backend_x11_get_xwindow (MetaBackendX11 *x11)
{
ClutterActor *stage = meta_backend_get_stage (META_BACKEND (x11));
return meta_x11_get_stage_window (CLUTTER_STAGE (stage));
2014-04-27 10:49:29 -04:00
}
void
meta_backend_x11_reload_cursor (MetaBackendX11 *x11)
{
MetaBackend *backend = META_BACKEND (x11);
MetaCursorRenderer *cursor_renderer =
meta_backend_get_cursor_renderer (backend);
meta_cursor_renderer_force_update (cursor_renderer);
}
void
meta_backend_x11_sync_pointer (MetaBackendX11 *backend_x11)
{
MetaBackend *backend = META_BACKEND (backend_x11);
ClutterBackend *clutter_backend = meta_backend_get_clutter_backend (backend);
ClutterSeat *seat = clutter_backend_get_default_seat (clutter_backend);
ClutterInputDevice *pointer = clutter_seat_get_pointer (seat);
ClutterStage *stage = CLUTTER_STAGE (meta_backend_get_stage (backend));
ClutterModifierType modifiers;
ClutterEvent *event;
graphene_point_t pos;
event = clutter_event_new (CLUTTER_MOTION);
clutter_seat_query_state (seat, pointer, NULL, &pos, &modifiers);
clutter_event_set_flags (event, CLUTTER_EVENT_FLAG_SYNTHETIC);
clutter_event_set_coords (event, pos.x, pos.y);
clutter_event_set_device (event, pointer);
clutter_event_set_state (event, modifiers);
clutter_event_set_source_device (event, NULL);
clutter_event_set_stage (event, stage);
clutter_event_put (event);
clutter_event_free (event);
}