/*
 * Clutter.
 *
 * An OpenGL based 'interactive canvas' library.
 *
 * Copyright (C) 2010 Intel Corp.
 * Copyright (C) 2014 Jonas Ådahl
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library. If not, see <http://www.gnu.org/licenses/>.
 *
 * Author: Damien Lespiau <damien.lespiau@intel.com>
 * Author: Jonas Ådahl <jadahl@gmail.com>
 */

#ifdef HAVE_CONFIG_H
#include "clutter-build-config.h"
#endif

#include <math.h>

#include "clutter/clutter-device-manager-private.h"
#include "clutter/clutter-event-private.h"
#include "clutter-private.h"
#include "clutter-evdev.h"
#include "clutter-input-device-tool-evdev.h"

#include "clutter-input-device-evdev.h"
#include "clutter-device-manager-evdev.h"

#include "cairo-gobject.h"

typedef struct _ClutterInputDeviceClass        ClutterInputDeviceEvdevClass;

#define clutter_input_device_evdev_get_type _clutter_input_device_evdev_get_type

G_DEFINE_TYPE (ClutterInputDeviceEvdev,
               clutter_input_device_evdev,
               CLUTTER_TYPE_INPUT_DEVICE)

enum {
  PROP_0,
  PROP_DEVICE_MATRIX,
  PROP_OUTPUT_ASPECT_RATIO,
  N_PROPS
};

static GParamSpec *obj_props[N_PROPS] = { 0 };

typedef struct _SlowKeysEventPending
{
  ClutterInputDeviceEvdev *device;
  ClutterEvent *event;
  ClutterEmitInputDeviceEvent emit_event_func;
  guint timer;
} SlowKeysEventPending;

static void clear_slow_keys      (ClutterInputDeviceEvdev *device);
static void stop_bounce_keys     (ClutterInputDeviceEvdev *device);
static void stop_toggle_slowkeys (ClutterInputDeviceEvdev *device);
static void stop_mousekeys_move  (ClutterInputDeviceEvdev *device);

static void
clutter_input_device_evdev_finalize (GObject *object)
{
  ClutterInputDevice *device = CLUTTER_INPUT_DEVICE (object);
  ClutterInputDeviceEvdev *device_evdev = CLUTTER_INPUT_DEVICE_EVDEV (object);
  ClutterDeviceManagerEvdev *manager_evdev =
    CLUTTER_DEVICE_MANAGER_EVDEV (device->device_manager);

  if (device_evdev->libinput_device)
    libinput_device_unref (device_evdev->libinput_device);

  clutter_input_device_evdev_release_touch_slots (device_evdev,
                                                  g_get_monotonic_time ());

  _clutter_device_manager_evdev_release_device_id (manager_evdev, device);

  clear_slow_keys (device_evdev);
  stop_bounce_keys (device_evdev);
  stop_toggle_slowkeys (device_evdev);
  stop_mousekeys_move (device_evdev);

  G_OBJECT_CLASS (clutter_input_device_evdev_parent_class)->finalize (object);
}

static void
clutter_input_device_evdev_set_property (GObject      *object,
                                         guint         prop_id,
                                         const GValue *value,
                                         GParamSpec   *pspec)
{
  ClutterInputDeviceEvdev *device = CLUTTER_INPUT_DEVICE_EVDEV (object);

  switch (prop_id)
    {
    case PROP_DEVICE_MATRIX:
      {
        const cairo_matrix_t *matrix = g_value_get_boxed (value);
        cairo_matrix_init_identity (&device->device_matrix);
        cairo_matrix_multiply (&device->device_matrix,
                               &device->device_matrix, matrix);
        break;
      }
    case PROP_OUTPUT_ASPECT_RATIO:
      device->output_ratio = g_value_get_double (value);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
    }
}

static void
clutter_input_device_evdev_get_property (GObject    *object,
                                         guint       prop_id,
                                         GValue     *value,
                                         GParamSpec *pspec)
{
  ClutterInputDeviceEvdev *device = CLUTTER_INPUT_DEVICE_EVDEV (object);

  switch (prop_id)
    {
    case PROP_DEVICE_MATRIX:
      g_value_set_boxed (value, &device->device_matrix);
      break;
    case PROP_OUTPUT_ASPECT_RATIO:
      g_value_set_double (value, device->output_ratio);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
    }
}

static gboolean
clutter_input_device_evdev_keycode_to_evdev (ClutterInputDevice *device,
                                             guint hardware_keycode,
                                             guint *evdev_keycode)
{
  /* The hardware keycodes from the evdev backend are almost evdev
     keycodes: we use the evdev keycode file, but xkb rules have an
     offset by 8. See the comment in _clutter_key_event_new_from_evdev()
  */
  *evdev_keycode = hardware_keycode - 8;
  return TRUE;
}

static void
clutter_input_device_evdev_update_from_tool (ClutterInputDevice     *device,
                                             ClutterInputDeviceTool *tool)
{
  ClutterInputDeviceToolEvdev *evdev_tool;

  evdev_tool = CLUTTER_INPUT_DEVICE_TOOL_EVDEV (tool);

  g_object_freeze_notify (G_OBJECT (device));

  _clutter_input_device_reset_axes (device);

  _clutter_input_device_add_axis (device, CLUTTER_INPUT_AXIS_X, 0, 0, 0);
  _clutter_input_device_add_axis (device, CLUTTER_INPUT_AXIS_Y, 0, 0, 0);

  if (libinput_tablet_tool_has_distance (evdev_tool->tool))
    _clutter_input_device_add_axis (device, CLUTTER_INPUT_AXIS_DISTANCE, 0, 1, 0);

  if (libinput_tablet_tool_has_pressure (evdev_tool->tool))
    _clutter_input_device_add_axis (device, CLUTTER_INPUT_AXIS_PRESSURE, 0, 1, 0);

  if (libinput_tablet_tool_has_tilt (evdev_tool->tool))
    {
      _clutter_input_device_add_axis (device, CLUTTER_INPUT_AXIS_XTILT, -90, 90, 0);
      _clutter_input_device_add_axis (device, CLUTTER_INPUT_AXIS_YTILT, -90, 90, 0);
    }

  if (libinput_tablet_tool_has_rotation (evdev_tool->tool))
    _clutter_input_device_add_axis (device, CLUTTER_INPUT_AXIS_ROTATION, 0, 360, 0);

  if (libinput_tablet_tool_has_slider (evdev_tool->tool))
    _clutter_input_device_add_axis (device, CLUTTER_INPUT_AXIS_SLIDER, -1, 1, 0);

  if (libinput_tablet_tool_has_wheel (evdev_tool->tool))
    _clutter_input_device_add_axis (device, CLUTTER_INPUT_AXIS_WHEEL, -180, 180, 0);

  g_object_thaw_notify (G_OBJECT (device));
}

static gboolean
clutter_input_device_evdev_is_mode_switch_button (ClutterInputDevice *device,
                                                  guint               group,
                                                  guint               button)
{
  struct libinput_device *libinput_device;
  struct libinput_tablet_pad_mode_group *mode_group;

  libinput_device = clutter_evdev_input_device_get_libinput_device (device);
  mode_group = libinput_device_tablet_pad_get_mode_group (libinput_device, group);

  return libinput_tablet_pad_mode_group_button_is_toggle (mode_group, button) != 0;
}

static gint
clutter_input_device_evdev_get_group_n_modes (ClutterInputDevice *device,
                                              gint                group)
{
  struct libinput_device *libinput_device;
  struct libinput_tablet_pad_mode_group *mode_group;

  libinput_device = clutter_evdev_input_device_get_libinput_device (device);
  mode_group = libinput_device_tablet_pad_get_mode_group (libinput_device, group);

  return libinput_tablet_pad_mode_group_get_num_modes (mode_group);
}

static gboolean
clutter_input_device_evdev_is_grouped (ClutterInputDevice *device,
                                       ClutterInputDevice *other_device)
{
  struct libinput_device *libinput_device, *other_libinput_device;

  libinput_device = clutter_evdev_input_device_get_libinput_device (device);
  other_libinput_device = clutter_evdev_input_device_get_libinput_device (other_device);

  return libinput_device_get_device_group (libinput_device) ==
    libinput_device_get_device_group (other_libinput_device);
}

static void
clutter_input_device_evdev_bell_notify (void)
{
  ClutterBackend *backend;

  backend = clutter_get_default_backend ();
  clutter_backend_bell_notify (backend);
}

static void
clutter_input_device_evdev_free_pending_slow_key (gpointer data)
{
  SlowKeysEventPending *slow_keys_event = data;

  clutter_event_free (slow_keys_event->event);
  if (slow_keys_event->timer)
    g_source_remove (slow_keys_event->timer);
  g_free (slow_keys_event);
}

static void
clear_slow_keys (ClutterInputDeviceEvdev *device)
{
  g_list_free_full (device->slow_keys_list, clutter_input_device_evdev_free_pending_slow_key);
  g_list_free (device->slow_keys_list);
  device->slow_keys_list = NULL;
}

static guint
get_slow_keys_delay (ClutterInputDevice *device)
{
  ClutterKbdA11ySettings a11y_settings;

  clutter_device_manager_get_kbd_a11y_settings (device->device_manager,
                                                &a11y_settings);
  /* Settings use int, we use uint, make sure we dont go negative */
  return MAX (0, a11y_settings.slowkeys_delay);
}

static gboolean
trigger_slow_keys (gpointer data)
{
  SlowKeysEventPending *slow_keys_event = data;
  ClutterInputDeviceEvdev *device = slow_keys_event->device;
  ClutterKeyEvent *key_event = (ClutterKeyEvent *) slow_keys_event->event;

  /* Alter timestamp and emit the event */
  key_event->time = us2ms (g_get_monotonic_time ());
  slow_keys_event->emit_event_func (slow_keys_event->event,
                                    CLUTTER_INPUT_DEVICE (device));

  /* Then remote the pending event */
  device->slow_keys_list = g_list_remove (device->slow_keys_list, slow_keys_event);
  clutter_input_device_evdev_free_pending_slow_key (slow_keys_event);

  if (device->a11y_flags & CLUTTER_A11Y_SLOW_KEYS_BEEP_ACCEPT)
    clutter_input_device_evdev_bell_notify ();

  return G_SOURCE_REMOVE;
}

static gint
find_pending_event_by_keycode (gconstpointer a,
                               gconstpointer b)
{
  const SlowKeysEventPending *pa = a;
  const ClutterKeyEvent *ka = (ClutterKeyEvent *) pa->event;
  const ClutterKeyEvent *kb = b;

  return kb->hardware_keycode - ka->hardware_keycode;
}

static void
start_slow_keys (ClutterEvent               *event,
                 ClutterInputDeviceEvdev    *device,
                 ClutterEmitInputDeviceEvent emit_event_func)
{
  SlowKeysEventPending *slow_keys_event;
  ClutterKeyEvent *key_event = (ClutterKeyEvent *) event;

  /* Synthetic key events are for autorepeat, ignore those... */
  if (key_event->flags & CLUTTER_EVENT_FLAG_SYNTHETIC)
    return;

  slow_keys_event = g_new0 (SlowKeysEventPending, 1);
  slow_keys_event->device = device;
  slow_keys_event->event = clutter_event_copy (event);
  slow_keys_event->emit_event_func = emit_event_func;
  slow_keys_event->timer =
    clutter_threads_add_timeout (get_slow_keys_delay (CLUTTER_INPUT_DEVICE (device)),
                                 trigger_slow_keys,
                                 slow_keys_event);
  device->slow_keys_list = g_list_append (device->slow_keys_list, slow_keys_event);

  if (device->a11y_flags & CLUTTER_A11Y_SLOW_KEYS_BEEP_PRESS)
    clutter_input_device_evdev_bell_notify ();
}

static void
stop_slow_keys (ClutterEvent               *event,
                ClutterInputDeviceEvdev    *device,
                ClutterEmitInputDeviceEvent emit_event_func)
{
  GList *item;

  /* Check if we have a slow key event queued for this key event */
  item = g_list_find_custom (device->slow_keys_list, event, find_pending_event_by_keycode);
  if (item)
    {
      SlowKeysEventPending *slow_keys_event = item->data;

      device->slow_keys_list = g_list_delete_link (device->slow_keys_list, item);
      clutter_input_device_evdev_free_pending_slow_key (slow_keys_event);

      if (device->a11y_flags & CLUTTER_A11Y_SLOW_KEYS_BEEP_REJECT)
        clutter_input_device_evdev_bell_notify ();

      return;
    }

  /* If no key press event was pending, just emit the key release as-is */
  emit_event_func (event, CLUTTER_INPUT_DEVICE (device));
}

static guint
get_debounce_delay (ClutterInputDevice *device)
{
  ClutterKbdA11ySettings a11y_settings;

  clutter_device_manager_get_kbd_a11y_settings (device->device_manager,
                                                &a11y_settings);
  /* Settings use int, we use uint, make sure we dont go negative */
  return MAX (0, a11y_settings.debounce_delay);
}

static gboolean
clear_bounce_keys (gpointer data)
{
  ClutterInputDeviceEvdev *device = data;

  device->debounce_key = 0;
  device->debounce_timer = 0;

  return G_SOURCE_REMOVE;
}

static void
start_bounce_keys (ClutterEvent            *event,
                   ClutterInputDeviceEvdev *device)
{
  stop_bounce_keys (device);

  device->debounce_key = ((ClutterKeyEvent *) event)->hardware_keycode;
  device->debounce_timer =
    clutter_threads_add_timeout (get_debounce_delay (CLUTTER_INPUT_DEVICE (device)),
                                 clear_bounce_keys,
                                 device);
}

static void
stop_bounce_keys (ClutterInputDeviceEvdev *device)
{
  if (device->debounce_timer)
    {
      g_source_remove (device->debounce_timer);
      device->debounce_timer = 0;
    }
}

static void
notify_bounce_keys_reject (ClutterInputDeviceEvdev *device)
{
  if (device->a11y_flags & CLUTTER_A11Y_BOUNCE_KEYS_BEEP_REJECT)
    clutter_input_device_evdev_bell_notify ();
}

static gboolean
debounce_key (ClutterEvent            *event,
              ClutterInputDeviceEvdev *device)
{
  return (device->debounce_key == ((ClutterKeyEvent *) event)->hardware_keycode);
}

static gboolean
key_event_is_modifier (ClutterEvent *event)
{
  switch (event->key.keyval)
    {
    case XKB_KEY_Shift_L:
    case XKB_KEY_Shift_R:
    case XKB_KEY_Control_L:
    case XKB_KEY_Control_R:
    case XKB_KEY_Alt_L:
    case XKB_KEY_Alt_R:
    case XKB_KEY_Meta_L:
    case XKB_KEY_Meta_R:
    case XKB_KEY_Super_L:
    case XKB_KEY_Super_R:
    case XKB_KEY_Hyper_L:
    case XKB_KEY_Hyper_R:
      return TRUE;
    default:
      return FALSE;
    }
}

static void
notify_stickykeys_mask (ClutterInputDeviceEvdev *device)
{
  g_signal_emit_by_name (CLUTTER_INPUT_DEVICE (device)->device_manager,
                         "kbd-a11y-mods-state-changed",
                         device->stickykeys_latched_mask,
                         device->stickykeys_locked_mask);
}

static void
update_internal_xkb_state (ClutterInputDeviceEvdev *device,
                           xkb_mod_mask_t           new_latched_mask,
                           xkb_mod_mask_t           new_locked_mask)
{
  ClutterSeatEvdev *seat = device->seat;
  xkb_mod_mask_t depressed_mods;
  xkb_mod_mask_t latched_mods;
  xkb_mod_mask_t locked_mods;
  xkb_mod_mask_t group_mods;

  depressed_mods = xkb_state_serialize_mods (seat->xkb, XKB_STATE_MODS_DEPRESSED);
  latched_mods = xkb_state_serialize_mods (seat->xkb, XKB_STATE_MODS_LATCHED);
  locked_mods = xkb_state_serialize_mods (seat->xkb, XKB_STATE_MODS_LOCKED);

  latched_mods &= ~device->stickykeys_latched_mask;
  locked_mods &= ~device->stickykeys_locked_mask;

  device->stickykeys_latched_mask = new_latched_mask;
  device->stickykeys_locked_mask = new_locked_mask;

  latched_mods |= device->stickykeys_latched_mask;
  locked_mods |= device->stickykeys_locked_mask;

  group_mods = xkb_state_serialize_layout (seat->xkb, XKB_STATE_LAYOUT_EFFECTIVE);

  xkb_state_update_mask (seat->xkb,
                         depressed_mods,
                         latched_mods,
                         locked_mods,
                         0, 0, group_mods);
  notify_stickykeys_mask (device);
}

static void
update_stickykeys_event (ClutterEvent            *event,
                         ClutterInputDeviceEvdev *device,
                         xkb_mod_mask_t           new_latched_mask,
                         xkb_mod_mask_t           new_locked_mask)
{
  ClutterSeatEvdev *seat = device->seat;
  xkb_mod_mask_t effective_mods;
  xkb_mod_mask_t latched_mods;
  xkb_mod_mask_t locked_mods;

  update_internal_xkb_state (device, new_latched_mask, new_locked_mask);

  effective_mods = xkb_state_serialize_mods (seat->xkb, XKB_STATE_MODS_EFFECTIVE);
  latched_mods = xkb_state_serialize_mods (seat->xkb, XKB_STATE_MODS_LATCHED);
  locked_mods = xkb_state_serialize_mods (seat->xkb, XKB_STATE_MODS_LOCKED);

  _clutter_event_set_state_full (event,
                                 seat->button_state,
                                 device->stickykeys_depressed_mask,
                                 latched_mods,
                                 locked_mods,
                                 effective_mods | seat->button_state);
}

static void
notify_stickykeys_change (ClutterInputDeviceEvdev *device)
{
  /* Everytime sticky keys setting is changed, clear the masks */
  device->stickykeys_depressed_mask = 0;
  update_internal_xkb_state (device, 0, 0);

  g_signal_emit_by_name (CLUTTER_INPUT_DEVICE (device)->device_manager,
                         "kbd-a11y-flags-changed",
                         device->a11y_flags,
                         CLUTTER_A11Y_STICKY_KEYS_ENABLED);
}

static void
set_stickykeys_off (ClutterInputDeviceEvdev *device)
{
  device->a11y_flags &= ~CLUTTER_A11Y_STICKY_KEYS_ENABLED;
  notify_stickykeys_change (device);
}

static void
set_stickykeys_on (ClutterInputDeviceEvdev *device)
{
  device->a11y_flags |= CLUTTER_A11Y_STICKY_KEYS_ENABLED;
  notify_stickykeys_change (device);
}

static void
clear_stickykeys_event (ClutterEvent            *event,
                        ClutterInputDeviceEvdev *device)
{
  set_stickykeys_off (device);
  update_stickykeys_event (event, device, 0, 0);
}

static void
set_slowkeys_off (ClutterInputDeviceEvdev *device)
{
  device->a11y_flags &= ~CLUTTER_A11Y_SLOW_KEYS_ENABLED;

  g_signal_emit_by_name (CLUTTER_INPUT_DEVICE (device)->device_manager,
                         "kbd-a11y-flags-changed",
                         device->a11y_flags,
                         CLUTTER_A11Y_SLOW_KEYS_ENABLED);
}

static void
set_slowkeys_on (ClutterInputDeviceEvdev *device)
{
  device->a11y_flags |= CLUTTER_A11Y_SLOW_KEYS_ENABLED;

  g_signal_emit_by_name (CLUTTER_INPUT_DEVICE (device)->device_manager,
                         "kbd-a11y-flags-changed",
                         device->a11y_flags,
                         CLUTTER_A11Y_SLOW_KEYS_ENABLED);
}

static void
handle_stickykeys_press (ClutterEvent            *event,
                         ClutterInputDeviceEvdev *device)
{
  ClutterSeatEvdev *seat = device->seat;
  xkb_mod_mask_t depressed_mods;
  xkb_mod_mask_t new_latched_mask;
  xkb_mod_mask_t new_locked_mask;

  if (!key_event_is_modifier (event))
    return;

  if (device->stickykeys_depressed_mask &&
      (device->a11y_flags & CLUTTER_A11Y_STICKY_KEYS_TWO_KEY_OFF))
    {
      clear_stickykeys_event (event, device);
      return;
    }

  depressed_mods = xkb_state_serialize_mods (seat->xkb, XKB_STATE_MODS_DEPRESSED);
  new_latched_mask = device->stickykeys_latched_mask;
  new_locked_mask = device->stickykeys_locked_mask;

  device->stickykeys_depressed_mask = depressed_mods;

  if (new_locked_mask & depressed_mods)
    {
      new_locked_mask &= ~depressed_mods;
    }
  else if (new_latched_mask & depressed_mods)
    {
      new_locked_mask |= depressed_mods;
      new_latched_mask &= ~depressed_mods;
    }
  else
    {
      new_latched_mask |= depressed_mods;
    }

  update_stickykeys_event (event, device, new_latched_mask, new_locked_mask);
}

static void
handle_stickykeys_release (ClutterEvent            *event,
                           ClutterInputDeviceEvdev *device)
{
  ClutterSeatEvdev *seat = device->seat;

  device->stickykeys_depressed_mask =
    xkb_state_serialize_mods (seat->xkb, XKB_STATE_MODS_DEPRESSED);

  if (key_event_is_modifier (event))
    {
      if (device->a11y_flags & CLUTTER_A11Y_STICKY_KEYS_BEEP)
        clutter_input_device_evdev_bell_notify ();

      return;
    }

  if (device->stickykeys_latched_mask == 0)
    return;

  update_stickykeys_event (event, device, 0, device->stickykeys_locked_mask);
}

static gboolean
trigger_toggle_slowkeys (gpointer data)
{
  ClutterInputDeviceEvdev *device = data;

  device->toggle_slowkeys_timer = 0;

  if (device->a11y_flags & CLUTTER_A11Y_FEATURE_STATE_CHANGE_BEEP)
    clutter_input_device_evdev_bell_notify ();

  if (device->a11y_flags & CLUTTER_A11Y_SLOW_KEYS_ENABLED)
    set_slowkeys_off (device);
  else
    set_slowkeys_on (device);

  return G_SOURCE_REMOVE;
}

static void
start_toggle_slowkeys (ClutterInputDeviceEvdev *device)
{
  if (device->toggle_slowkeys_timer != 0)
    return;

  device->toggle_slowkeys_timer =
    clutter_threads_add_timeout (8 * 1000 /* 8 secs */,
                                 trigger_toggle_slowkeys,
                                 device);
}

static void
stop_toggle_slowkeys (ClutterInputDeviceEvdev *device)
{
  if (device->toggle_slowkeys_timer)
    {
      g_source_remove (device->toggle_slowkeys_timer);
      device->toggle_slowkeys_timer = 0;
    }
}

static void
handle_togglekeys_press (ClutterEvent            *event,
                         ClutterInputDeviceEvdev *device)
{
  if (event->key.keyval == XKB_KEY_Shift_L || event->key.keyval == XKB_KEY_Shift_R)
    {
      start_toggle_slowkeys (device);

      if (event->key.time > device->last_shift_time + 15 * 1000 /* 15 secs  */)
        device->shift_count = 1;
      else
        device->shift_count++;

      device->last_shift_time = event->key.time;
    }
  else
    {
      device->shift_count = 0;
      stop_toggle_slowkeys (device);
    }
}

static void
handle_togglekeys_release (ClutterEvent            *event,
                           ClutterInputDeviceEvdev *device)
{
  if (event->key.keyval == XKB_KEY_Shift_L || event->key.keyval == XKB_KEY_Shift_R)
    {
      stop_toggle_slowkeys (device);
      if (device->shift_count >= 5)
        {
          device->shift_count = 0;

          if (device->a11y_flags & CLUTTER_A11Y_FEATURE_STATE_CHANGE_BEEP)
            clutter_input_device_evdev_bell_notify ();

          if (device->a11y_flags & CLUTTER_A11Y_STICKY_KEYS_ENABLED)
            set_stickykeys_off (device);
          else
            set_stickykeys_on (device);
        }
    }
}

static int
get_button_index (gint button)
{
  switch (button)
    {
    case BTN_LEFT:
      return 0;
    case BTN_MIDDLE:
      return 1;
    case BTN_RIGHT:
      return 2;
    default:
      break;
    }

  g_warn_if_reached ();
  return 0;
}

static void
emulate_button_press (ClutterInputDeviceEvdev *device)
{
  gint btn = device->mousekeys_btn;

  if (device->mousekeys_btn_states[get_button_index (btn)])
    return;

  clutter_virtual_input_device_notify_button (device->mousekeys_virtual_device,
                                              g_get_monotonic_time (), btn,
                                              CLUTTER_BUTTON_STATE_PRESSED);
  device->mousekeys_btn_states[get_button_index (btn)] = CLUTTER_BUTTON_STATE_PRESSED;
}

static void
emulate_button_release (ClutterInputDeviceEvdev *device)
{
  gint btn = device->mousekeys_btn;

  if (device->mousekeys_btn_states[get_button_index (btn)] == CLUTTER_BUTTON_STATE_RELEASED)
    return;

  clutter_virtual_input_device_notify_button (device->mousekeys_virtual_device,
                                              g_get_monotonic_time (), btn,
                                              CLUTTER_BUTTON_STATE_RELEASED);
  device->mousekeys_btn_states[get_button_index (btn)] = CLUTTER_BUTTON_STATE_RELEASED;
}

static void
emulate_button_click (ClutterInputDeviceEvdev *device)
{
  emulate_button_press (device);
  emulate_button_release (device);
}

#define MOUSEKEYS_CURVE (1.0 + (((double) 50.0) * 0.001))

static void
update_mousekeys_params (ClutterInputDeviceEvdev *device,
                         ClutterKbdA11ySettings  *settings)
{
  /* Prevent us from broken settings values */
  device->mousekeys_max_speed = MAX (1, settings->mousekeys_max_speed);
  device->mousekeys_accel_time = MAX (1, settings->mousekeys_accel_time);
  device->mousekeys_init_delay = MAX (0, settings->mousekeys_init_delay);

  device->mousekeys_curve_factor =
    (((gdouble) device->mousekeys_max_speed) /
      pow ((gdouble) device->mousekeys_accel_time, MOUSEKEYS_CURVE));
}

static gdouble
mousekeys_get_speed_factor (ClutterInputDeviceEvdev *device,
                            gint64                   time_us)
{
  guint32 time;
  gint64 delta_t;
  gint64 init_time;
  gdouble speed;

  time = us2ms (time_us);

  if (device->mousekeys_first_motion_time == 0)
    {
      /* Start acceleration _after_ the first move, so take
       * mousekeys_init_delay into account for t0
       */
      device->mousekeys_first_motion_time = time + device->mousekeys_init_delay;
      device->mousekeys_last_motion_time = device->mousekeys_first_motion_time;
      return 1.0;
    }

  init_time = time - device->mousekeys_first_motion_time;
  delta_t = time - device->mousekeys_last_motion_time;

  if (delta_t < 0)
    return 0.0;

  if (init_time < device->mousekeys_accel_time)
    speed = (double) (device->mousekeys_curve_factor *
                      pow ((double) init_time, MOUSEKEYS_CURVE) * delta_t / 1000.0);
  else
    speed = (double) (device->mousekeys_max_speed * delta_t / 1000.0);

  device->mousekeys_last_motion_time = time;

  return speed;
}

#undef MOUSEKEYS_CURVE

static void
emulate_pointer_motion (ClutterInputDeviceEvdev *device,
                        gint                     dx,
                        gint                     dy)
{
  gdouble dx_motion;
  gdouble dy_motion;
  gdouble speed;
  gint64 time_us;

  time_us = g_get_monotonic_time ();
  speed = mousekeys_get_speed_factor (device, time_us);

  if (dx < 0)
    dx_motion = floor (((gdouble) dx) * speed);
  else
    dx_motion = ceil (((gdouble) dx) * speed);

  if (dy < 0)
    dy_motion = floor (((gdouble) dy) * speed);
  else
    dy_motion = ceil (((gdouble) dy) * speed);

  clutter_virtual_input_device_notify_relative_motion (device->mousekeys_virtual_device,
                                                       time_us, dx_motion, dy_motion);
}

static void
enable_mousekeys (ClutterInputDeviceEvdev *device)
{
  ClutterDeviceManager *manager;

  device->mousekeys_btn = BTN_LEFT;
  device->move_mousekeys_timer = 0;
  device->mousekeys_first_motion_time = 0;
  device->mousekeys_last_motion_time = 0;
  device->last_mousekeys_key = 0;

  if (device->mousekeys_virtual_device)
    return;

  manager = CLUTTER_INPUT_DEVICE (device)->device_manager;
  device->mousekeys_virtual_device =
    clutter_device_manager_create_virtual_device (manager,
                                                  CLUTTER_POINTER_DEVICE);
}

static void
disable_mousekeys (ClutterInputDeviceEvdev *device)
{
  stop_mousekeys_move (device);

  /* Make sure we don't leave button pressed behind... */
  if (device->mousekeys_btn_states[get_button_index (BTN_LEFT)])
    {
      device->mousekeys_btn = BTN_LEFT;
      emulate_button_release (device);
    }

  if (device->mousekeys_btn_states[get_button_index (BTN_MIDDLE)])
    {
      device->mousekeys_btn = BTN_MIDDLE;
      emulate_button_release (device);
    }

  if (device->mousekeys_btn_states[get_button_index (BTN_RIGHT)])
    {
      device->mousekeys_btn = BTN_RIGHT;
      emulate_button_release (device);
    }

  if (device->mousekeys_virtual_device)
    g_clear_object (&device->mousekeys_virtual_device);
}

static gboolean
trigger_mousekeys_move (gpointer data)
{
  ClutterInputDeviceEvdev *device = data;
  gint dx = 0;
  gint dy = 0;

  if (device->mousekeys_first_motion_time == 0)
    {
      /* This is the first move, Secdule at mk_init_delay */
      device->move_mousekeys_timer =
        clutter_threads_add_timeout (device->mousekeys_init_delay,
                                     trigger_mousekeys_move,
                                     device);

    }
  else
    {
      /* More moves, reschedule at mk_interval */
      device->move_mousekeys_timer =
        clutter_threads_add_timeout (100, /* msec between mousekey events */
                                     trigger_mousekeys_move,
                                     device);
    }

  /* Pointer motion */
  switch (device->last_mousekeys_key)
    {
    case XKB_KEY_KP_Home:
    case XKB_KEY_KP_7:
    case XKB_KEY_KP_Up:
    case XKB_KEY_KP_8:
    case XKB_KEY_KP_Page_Up:
    case XKB_KEY_KP_9:
       dy = -1;
       break;
    case XKB_KEY_KP_End:
    case XKB_KEY_KP_1:
    case XKB_KEY_KP_Down:
    case XKB_KEY_KP_2:
    case XKB_KEY_KP_Page_Down:
    case XKB_KEY_KP_3:
       dy = 1;
       break;
    default:
       break;
    }

  switch (device->last_mousekeys_key)
    {
    case XKB_KEY_KP_Home:
    case XKB_KEY_KP_7:
    case XKB_KEY_KP_Left:
    case XKB_KEY_KP_4:
    case XKB_KEY_KP_End:
    case XKB_KEY_KP_1:
       dx = -1;
       break;
    case XKB_KEY_KP_Page_Up:
    case XKB_KEY_KP_9:
    case XKB_KEY_KP_Right:
    case XKB_KEY_KP_6:
    case XKB_KEY_KP_Page_Down:
    case XKB_KEY_KP_3:
       dx = 1;
       break;
    default:
       break;
    }

  if (dx != 0 || dy != 0)
    emulate_pointer_motion (device, dx, dy);

  /* We reschedule each time */
  return G_SOURCE_REMOVE;
}

static void
stop_mousekeys_move (ClutterInputDeviceEvdev *device)
{
  device->mousekeys_first_motion_time = 0;
  device->mousekeys_last_motion_time = 0;

  if (device->move_mousekeys_timer)
    {
      g_source_remove (device->move_mousekeys_timer);
      device->move_mousekeys_timer = 0;
    }
}

static void
start_mousekeys_move (ClutterEvent            *event,
                      ClutterInputDeviceEvdev *device)
{
  device->last_mousekeys_key = event->key.keyval;

  if (device->move_mousekeys_timer != 0)
    return;

  trigger_mousekeys_move (device);
}

static gboolean
handle_mousekeys_press (ClutterEvent            *event,
                        ClutterInputDeviceEvdev *device)
{
  if (!(event->key.flags & CLUTTER_EVENT_FLAG_SYNTHETIC))
    stop_mousekeys_move (device);

  /* Button selection */
  switch (event->key.keyval)
    {
    case XKB_KEY_KP_Divide:
      device->mousekeys_btn = BTN_LEFT;
      return TRUE;
    case XKB_KEY_KP_Multiply:
      device->mousekeys_btn = BTN_MIDDLE;
      return TRUE;
    case XKB_KEY_KP_Subtract:
      device->mousekeys_btn = BTN_RIGHT;
      return TRUE;
    default:
      break;
    }

  /* Button events */
  switch (event->key.keyval)
    {
    case XKB_KEY_KP_Begin:
    case XKB_KEY_KP_5:
      emulate_button_click (device);
      return TRUE;
    case XKB_KEY_KP_Insert:
    case XKB_KEY_KP_0:
      emulate_button_press (device);
      return TRUE;
    case XKB_KEY_KP_Decimal:
    case XKB_KEY_KP_Delete:
      emulate_button_release (device);
      return TRUE;
    case XKB_KEY_KP_Add:
      emulate_button_click (device);
      emulate_button_click (device);
      return TRUE;
    default:
      break;
    }

  /* Pointer motion */
  switch (event->key.keyval)
    {
    case XKB_KEY_KP_1:
    case XKB_KEY_KP_2:
    case XKB_KEY_KP_3:
    case XKB_KEY_KP_4:
    case XKB_KEY_KP_6:
    case XKB_KEY_KP_7:
    case XKB_KEY_KP_8:
    case XKB_KEY_KP_9:
    case XKB_KEY_KP_Down:
    case XKB_KEY_KP_End:
    case XKB_KEY_KP_Home:
    case XKB_KEY_KP_Left:
    case XKB_KEY_KP_Page_Down:
    case XKB_KEY_KP_Page_Up:
    case XKB_KEY_KP_Right:
    case XKB_KEY_KP_Up:
      start_mousekeys_move (event, device);
      return TRUE;
    default:
      break;
    }

  return FALSE;
}

static gboolean
handle_mousekeys_release (ClutterEvent            *event,
                          ClutterInputDeviceEvdev *device)
{
  switch (event->key.keyval)
    {
    case XKB_KEY_KP_0:
    case XKB_KEY_KP_1:
    case XKB_KEY_KP_2:
    case XKB_KEY_KP_3:
    case XKB_KEY_KP_4:
    case XKB_KEY_KP_5:
    case XKB_KEY_KP_6:
    case XKB_KEY_KP_7:
    case XKB_KEY_KP_8:
    case XKB_KEY_KP_9:
    case XKB_KEY_KP_Add:
    case XKB_KEY_KP_Begin:
    case XKB_KEY_KP_Decimal:
    case XKB_KEY_KP_Delete:
    case XKB_KEY_KP_Divide:
    case XKB_KEY_KP_Down:
    case XKB_KEY_KP_End:
    case XKB_KEY_KP_Home:
    case XKB_KEY_KP_Insert:
    case XKB_KEY_KP_Left:
    case XKB_KEY_KP_Multiply:
    case XKB_KEY_KP_Page_Down:
    case XKB_KEY_KP_Page_Up:
    case XKB_KEY_KP_Right:
    case XKB_KEY_KP_Subtract:
    case XKB_KEY_KP_Up:
      stop_mousekeys_move (device);
      return TRUE;
    default:
       break;
    }

  return FALSE;
}

static void
clutter_input_device_evdev_process_kbd_a11y_event (ClutterEvent               *event,
                                                   ClutterInputDevice         *device,
                                                   ClutterEmitInputDeviceEvent emit_event_func)
{
  ClutterInputDeviceEvdev *device_evdev = CLUTTER_INPUT_DEVICE_EVDEV (device);

  /* Ignore key events injected from IM */
  if (event->key.flags & CLUTTER_EVENT_FLAG_INPUT_METHOD)
    goto emit_event;

  if (!device_evdev->a11y_flags & CLUTTER_A11Y_KEYBOARD_ENABLED)
    goto emit_event;

  if (device_evdev->a11y_flags & CLUTTER_A11Y_MOUSE_KEYS_ENABLED)
    {
      if (event->type == CLUTTER_KEY_PRESS &&
          handle_mousekeys_press (event, device_evdev))
        return; /* swallow event */
      if (event->type == CLUTTER_KEY_RELEASE &&
          handle_mousekeys_release (event, device_evdev))
        return; /* swallow event */
    }

  if (device_evdev->a11y_flags & CLUTTER_A11Y_TOGGLE_KEYS_ENABLED)
    {
      if (event->type == CLUTTER_KEY_PRESS)
        handle_togglekeys_press (event, device_evdev);
      else
        handle_togglekeys_release (event, device_evdev);
    }

  if ((device_evdev->a11y_flags & CLUTTER_A11Y_BOUNCE_KEYS_ENABLED) &&
      (get_debounce_delay (device) != 0))
    {
      if ((event->type == CLUTTER_KEY_PRESS) && debounce_key (event, device_evdev))
        {
          notify_bounce_keys_reject (device_evdev);

          return;
        }
      else if (event->type == CLUTTER_KEY_RELEASE)
        start_bounce_keys (event, device_evdev);
    }

  if ((device_evdev->a11y_flags & CLUTTER_A11Y_SLOW_KEYS_ENABLED) &&
      (get_slow_keys_delay (device) != 0))
    {
      if (event->type == CLUTTER_KEY_PRESS)
        start_slow_keys (event, device_evdev, emit_event_func);
      else if (event->type == CLUTTER_KEY_RELEASE)
        stop_slow_keys (event, device_evdev, emit_event_func);

      return;
    }

  if (device_evdev->a11y_flags & CLUTTER_A11Y_STICKY_KEYS_ENABLED)
    {
      if (event->type == CLUTTER_KEY_PRESS)
        handle_stickykeys_press (event, device_evdev);
      else if (event->type == CLUTTER_KEY_RELEASE)
        handle_stickykeys_release (event, device_evdev);
    }

emit_event:
  emit_event_func (event, device);
}

void
clutter_input_device_evdev_apply_kbd_a11y_settings (ClutterInputDeviceEvdev *device,
                                                    ClutterKbdA11ySettings  *settings)
{
  ClutterKeyboardA11yFlags changed_flags = (device->a11y_flags ^ settings->controls);

  if (changed_flags & (CLUTTER_A11Y_KEYBOARD_ENABLED | CLUTTER_A11Y_SLOW_KEYS_ENABLED))
    clear_slow_keys (device);

  if (changed_flags & (CLUTTER_A11Y_KEYBOARD_ENABLED | CLUTTER_A11Y_BOUNCE_KEYS_ENABLED))
    device->debounce_key = 0;

  if (changed_flags & (CLUTTER_A11Y_KEYBOARD_ENABLED | CLUTTER_A11Y_STICKY_KEYS_ENABLED))
    {
      device->stickykeys_depressed_mask = 0;
      update_internal_xkb_state (device, 0, 0);
    }

  if (changed_flags & (CLUTTER_A11Y_KEYBOARD_ENABLED | CLUTTER_A11Y_TOGGLE_KEYS_ENABLED))
    {
      device->toggle_slowkeys_timer = 0;
      device->shift_count = 0;
      device->last_shift_time = 0;
    }

  if (changed_flags & (CLUTTER_A11Y_KEYBOARD_ENABLED | CLUTTER_A11Y_MOUSE_KEYS_ENABLED))
    {
      if (settings->controls &
          (CLUTTER_A11Y_KEYBOARD_ENABLED | CLUTTER_A11Y_MOUSE_KEYS_ENABLED))
        enable_mousekeys (device);
      else
        disable_mousekeys (device);
    }
  update_mousekeys_params (device, settings);

  /* Keep our own copy of keyboard a11y features flags to see what changes */
  device->a11y_flags = settings->controls;
}

static void
release_device_touch_slot (gpointer value)
{
  ClutterTouchState *touch_state = value;

  clutter_seat_evdev_release_touch_state (touch_state->seat, touch_state);
}

ClutterTouchState *
clutter_input_device_evdev_acquire_touch_state (ClutterInputDeviceEvdev *device,
                                                int                      device_slot)
{
  ClutterTouchState *touch_state;

  touch_state = clutter_seat_evdev_acquire_touch_state (device->seat,
                                                        device_slot);
  g_hash_table_insert (device->touches,
                       GINT_TO_POINTER (device_slot),
                       touch_state);

  return touch_state;
}

ClutterTouchState *
clutter_input_device_evdev_lookup_touch_state (ClutterInputDeviceEvdev *device,
                                               int                      device_slot)
{
  return g_hash_table_lookup (device->touches, GINT_TO_POINTER (device_slot));
}

void
clutter_input_device_evdev_release_touch_state (ClutterInputDeviceEvdev *device,
                                                ClutterTouchState       *touch_state)
{
  g_hash_table_remove (device->touches,
                       GINT_TO_POINTER (touch_state->device_slot));
}

static void
clutter_input_device_evdev_class_init (ClutterInputDeviceEvdevClass *klass)
{
  GObjectClass *object_class = G_OBJECT_CLASS (klass);

  object_class->finalize = clutter_input_device_evdev_finalize;
  object_class->set_property = clutter_input_device_evdev_set_property;
  object_class->get_property = clutter_input_device_evdev_get_property;

  klass->keycode_to_evdev = clutter_input_device_evdev_keycode_to_evdev;
  klass->update_from_tool = clutter_input_device_evdev_update_from_tool;
  klass->is_mode_switch_button = clutter_input_device_evdev_is_mode_switch_button;
  klass->get_group_n_modes = clutter_input_device_evdev_get_group_n_modes;
  klass->is_grouped = clutter_input_device_evdev_is_grouped;
  klass->process_kbd_a11y_event = clutter_input_device_evdev_process_kbd_a11y_event;

  obj_props[PROP_DEVICE_MATRIX] =
    g_param_spec_boxed ("device-matrix",
			P_("Device input matrix"),
			P_("Device input matrix"),
			CAIRO_GOBJECT_TYPE_MATRIX,
			CLUTTER_PARAM_READWRITE);
  obj_props[PROP_OUTPUT_ASPECT_RATIO] =
    g_param_spec_double ("output-aspect-ratio",
                         P_("Output aspect ratio"),
                         P_("Output aspect ratio"),
                         0, G_MAXDOUBLE, 0,
                         CLUTTER_PARAM_READWRITE);

  g_object_class_install_properties (object_class, N_PROPS, obj_props);
}

static void
clutter_input_device_evdev_init (ClutterInputDeviceEvdev *self)
{
  cairo_matrix_init_identity (&self->device_matrix);
  self->device_aspect_ratio = 0;
  self->output_ratio = 0;

  self->touches = g_hash_table_new_full (NULL, NULL,
                                         NULL, release_device_touch_slot);
}

/*
 * _clutter_input_device_evdev_new:
 * @manager: the device manager
 * @seat: the seat the device will belong to
 * @libinput_device: the libinput device
 *
 * Create a new ClutterInputDevice given a libinput device and associate
 * it with the provided seat.
 */
ClutterInputDevice *
_clutter_input_device_evdev_new (ClutterDeviceManager *manager,
                                 ClutterSeatEvdev *seat,
                                 struct libinput_device *libinput_device)
{
  ClutterInputDeviceEvdev *device;
  ClutterInputDeviceType type;
  ClutterDeviceManagerEvdev *manager_evdev;
  gchar *vendor, *product;
  gint device_id, n_rings = 0, n_strips = 0, n_groups = 1;
  gchar *node_path;
  gdouble width, height;

  type = _clutter_input_device_evdev_determine_type (libinput_device);
  vendor = g_strdup_printf ("%.4x", libinput_device_get_id_vendor (libinput_device));
  product = g_strdup_printf ("%.4x", libinput_device_get_id_product (libinput_device));
  manager_evdev = CLUTTER_DEVICE_MANAGER_EVDEV (manager);
  device_id = _clutter_device_manager_evdev_acquire_device_id (manager_evdev);
  node_path = g_strdup_printf ("/dev/input/%s", libinput_device_get_sysname (libinput_device));

  if (libinput_device_has_capability (libinput_device,
                                      LIBINPUT_DEVICE_CAP_TABLET_PAD))
    {
      n_rings = libinput_device_tablet_pad_get_num_rings (libinput_device);
      n_strips = libinput_device_tablet_pad_get_num_strips (libinput_device);
      n_groups = libinput_device_tablet_pad_get_num_mode_groups (libinput_device);
    }

  device = g_object_new (CLUTTER_TYPE_INPUT_DEVICE_EVDEV,
                         "id", device_id,
                         "name", libinput_device_get_name (libinput_device),
                         "device-manager", manager,
                         "device-type", type,
                         "device-mode", CLUTTER_INPUT_MODE_SLAVE,
                         "enabled", TRUE,
                         "vendor-id", vendor,
                         "product-id", product,
                         "n-rings", n_rings,
                         "n-strips", n_strips,
                         "n-mode-groups", n_groups,
                         "device-node", node_path,
                         NULL);

  device->seat = seat;
  device->libinput_device = libinput_device;

  libinput_device_set_user_data (libinput_device, device);
  libinput_device_ref (libinput_device);
  g_free (vendor);
  g_free (product);
  g_free (node_path);

  if (libinput_device_get_size (libinput_device, &width, &height) == 0)
    device->device_aspect_ratio = width / height;

  return CLUTTER_INPUT_DEVICE (device);
}

/*
 * _clutter_input_device_evdev_new_virtual:
 * @manager: the device manager
 * @seat: the seat the device will belong to
 * @type: the input device type
 *
 * Create a new virtual ClutterInputDevice of the given type.
 */
ClutterInputDevice *
_clutter_input_device_evdev_new_virtual (ClutterDeviceManager *manager,
                                         ClutterSeatEvdev *seat,
                                         ClutterInputDeviceType type,
                                         ClutterInputMode mode)
{
  ClutterInputDeviceEvdev *device;
  ClutterDeviceManagerEvdev *manager_evdev;
  const char *name;
  gint device_id;

  switch (type)
    {
    case CLUTTER_KEYBOARD_DEVICE:
      name = "Virtual keyboard device for seat";
      break;
    case CLUTTER_POINTER_DEVICE:
      name = "Virtual pointer device for seat";
      break;
    case CLUTTER_TOUCHSCREEN_DEVICE:
      name = "Virtual touchscreen device for seat";
      break;
    default:
      name = "Virtual device for seat";
      break;
    };

  manager_evdev = CLUTTER_DEVICE_MANAGER_EVDEV (manager);
  device_id = _clutter_device_manager_evdev_acquire_device_id (manager_evdev);
  device = g_object_new (CLUTTER_TYPE_INPUT_DEVICE_EVDEV,
                         "id", device_id,
                         "name", name,
                         "device-manager", manager,
                         "device-type", type,
                         "device-mode", mode,
                         "enabled", TRUE,
                         NULL);

  device->seat = seat;

  return CLUTTER_INPUT_DEVICE (device);
}

ClutterSeatEvdev *
_clutter_input_device_evdev_get_seat (ClutterInputDeviceEvdev *device)
{
  return device->seat;
}

void
_clutter_input_device_evdev_update_leds (ClutterInputDeviceEvdev *device,
                                         enum libinput_led leds)
{
  if (!device->libinput_device)
    return;

  libinput_device_led_update (device->libinput_device, leds);
}

ClutterInputDeviceType
_clutter_input_device_evdev_determine_type (struct libinput_device *ldev)
{
  /* This setting is specific to touchpads and alike, only in these
   * devices there is this additional layer of touch event interpretation.
   */
  if (libinput_device_config_tap_get_finger_count (ldev) > 0)
    return CLUTTER_TOUCHPAD_DEVICE;
  else if (libinput_device_has_capability (ldev, LIBINPUT_DEVICE_CAP_TABLET_TOOL))
    return CLUTTER_TABLET_DEVICE;
  else if (libinput_device_has_capability (ldev, LIBINPUT_DEVICE_CAP_TABLET_PAD))
    return CLUTTER_PAD_DEVICE;
  else if (libinput_device_has_capability (ldev, LIBINPUT_DEVICE_CAP_POINTER))
    return CLUTTER_POINTER_DEVICE;
  else if (libinput_device_has_capability (ldev, LIBINPUT_DEVICE_CAP_TOUCH))
    return CLUTTER_TOUCHSCREEN_DEVICE;
  else if (libinput_device_has_capability (ldev, LIBINPUT_DEVICE_CAP_KEYBOARD))
    return CLUTTER_KEYBOARD_DEVICE;
  else
    return CLUTTER_EXTENSION_DEVICE;
}

/**
 * clutter_evdev_input_device_get_libinput_device:
 * @device: a #ClutterInputDevice
 *
 * Retrieves the libinput_device struct held in @device.
 *
 * Returns: The libinput_device struct
 *
 * Since: 1.20
 * Stability: unstable
 **/
struct libinput_device *
clutter_evdev_input_device_get_libinput_device (ClutterInputDevice *device)
{
  ClutterInputDeviceEvdev *device_evdev;

  g_return_val_if_fail (CLUTTER_IS_INPUT_DEVICE_EVDEV (device), NULL);

  device_evdev = CLUTTER_INPUT_DEVICE_EVDEV (device);

  return device_evdev->libinput_device;
}

/**
 * clutter_evdev_event_sequence_get_slot:
 * @sequence: a #ClutterEventSequence
 *
 * Retrieves the touch slot triggered by this @sequence
 *
 * Returns: the libinput touch slot.
 *
 * Since: 1.20
 * Stability: unstable
 **/
gint32
clutter_evdev_event_sequence_get_slot (const ClutterEventSequence *sequence)
{
  if (!sequence)
    return -1;

  return GPOINTER_TO_INT (sequence) - 1;
}

void
clutter_input_device_evdev_translate_coordinates (ClutterInputDevice *device,
                                                  ClutterStage       *stage,
                                                  gfloat             *x,
                                                  gfloat             *y)
{
  ClutterInputDeviceEvdev *device_evdev = CLUTTER_INPUT_DEVICE_EVDEV (device);
  double min_x = 0, min_y = 0, max_x = 1, max_y = 1;
  gdouble stage_width, stage_height;
  double x_d, y_d;

  stage_width = clutter_actor_get_width (CLUTTER_ACTOR (stage));
  stage_height = clutter_actor_get_height (CLUTTER_ACTOR (stage));
  x_d = *x / stage_width;
  y_d = *y / stage_height;

  /* Apply aspect ratio */
  if (device_evdev->output_ratio > 0 &&
      device_evdev->device_aspect_ratio > 0)
    {
      gdouble ratio = device_evdev->device_aspect_ratio / device_evdev->output_ratio;

      if (ratio > 1)
        x_d *= ratio;
      else if (ratio < 1)
        y_d *= 1 / ratio;
    }

  cairo_matrix_transform_point (&device_evdev->device_matrix, &min_x, &min_y);
  cairo_matrix_transform_point (&device_evdev->device_matrix, &max_x, &max_y);
  cairo_matrix_transform_point (&device_evdev->device_matrix, &x_d, &y_d);

  *x = CLAMP (x_d, MIN (min_x, max_x), MAX (min_x, max_x)) * stage_width;
  *y = CLAMP (y_d, MIN (min_y, max_y), MAX (min_y, max_y)) * stage_height;
}

void
clutter_input_device_evdev_release_touch_slots (ClutterInputDeviceEvdev *device_evdev,
                                                uint64_t                 time_us)
{
  GHashTableIter iter;
  ClutterTouchState *touch_state;

  g_hash_table_iter_init (&iter, device_evdev->touches);
  while (g_hash_table_iter_next (&iter, NULL, (gpointer *) &touch_state))
    {
      clutter_seat_evdev_notify_touch_event (touch_state->seat,
                                             CLUTTER_INPUT_DEVICE (device_evdev),
                                             CLUTTER_TOUCH_CANCEL,
                                             time_us,
                                             touch_state->seat_slot,
                                             touch_state->coords.x,
                                             touch_state->coords.y);
      g_hash_table_iter_remove (&iter);
    }
}