uwac-input.c

/*
 * Copyright © 2014-2015 David FORT <contact@hardening-consulting.com>
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided that
 * the above copyright notice appear in all copies and that both that copyright
 * notice and this permission notice appear in supporting documentation, and
 * that the name of the copyright holders not be used in advertising or
 * publicity pertaining to distribution of the software without specific,
 * written prior permission.  The copyright holders make no representations
 * about the suitability of this software for any purpose.  It is provided "as
 * is" without express or implied warranty.
 *
 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
 * OF THIS SOFTWARE.
 */
#include "uwac-priv.h"
#include "uwac-utils.h"
 
#include <stdio.h>
#include <inttypes.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <assert.h>
#include <errno.h>
#include <time.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/timerfd.h>
#include <sys/epoll.h>
 
#include "uwac-os.h"
#include "wayland-cursor.h"
#include "wayland-client-protocol.h"
 
static struct wl_buffer* create_pointer_buffer(UwacSeat* seat, const void* src, size_t size)
{
  struct wl_buffer* buffer = NULL;
  int fd = 0;
  void* data = NULL;
  struct wl_shm_pool* pool = NULL;
 
  assert(seat);
 
  fd = uwac_create_anonymous_file(size);
 
  if (fd < 0)
    return buffer;
 
  data = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
 
  if (data == MAP_FAILED)
  {
    goto error_mmap;
  }
  memcpy(data, src, size);
 
  pool = wl_shm_create_pool(seat->display->shm, fd, size);
 
  if (!pool)
  {
    munmap(data, size);
    goto error_mmap;
  }
 
  buffer =
      wl_shm_pool_create_buffer(pool, 0, seat->pointer_image->width, seat->pointer_image->height,
                                seat->pointer_image->width * 4, WL_SHM_FORMAT_ARGB8888);
  wl_shm_pool_destroy(pool);
 
  if (munmap(data, size) < 0)
  {
    char buffer[256] = { 0 };
    (void)fprintf(stderr, "%s: munmap(%p, %zu) failed with [%d] %s\n", __func__, data, size,
                  errno, uwac_strerror(errno, buffer, sizeof(buffer)));
  }
 
error_mmap:
  close(fd);
  return buffer;
}
 
static void on_buffer_release(void* data, struct wl_buffer* wl_buffer)
{
  (void)data;
  wl_buffer_destroy(wl_buffer);
}
 
static const struct wl_buffer_listener buffer_release_listener = { on_buffer_release };
 
static UwacReturnCode set_cursor_image(UwacSeat* seat, uint32_t serial)
{
  struct wl_buffer* buffer = NULL;
  struct wl_cursor* cursor = NULL;
  struct wl_cursor_image* image = NULL;
  struct wl_surface* surface = NULL;
  int32_t x = 0;
  int32_t y = 0;
 
  if (!seat || !seat->display || !seat->default_cursor || !seat->default_cursor->images)
    return UWAC_ERROR_INTERNAL;
 
  int scale = 1;
  if (seat->pointer_focus)
    scale = seat->pointer_focus->display->actual_scale;
 
  switch (seat->pointer_type)
  {
    case 2: /* Custom poiner */
      image = seat->pointer_image;
      buffer = create_pointer_buffer(seat, seat->pointer_data, seat->pointer_size);
      if (!buffer)
        return UWAC_ERROR_INTERNAL;
      if (wl_buffer_add_listener(buffer, &buffer_release_listener, seat) < 0)
        return UWAC_ERROR_INTERNAL;
 
      surface = seat->pointer_surface;
      x = image->hotspot_x / scale;
      y = image->hotspot_y / scale;
      break;
    case 1: /* NULL pointer */
      break;
    default: /* Default system pointer */
      cursor = seat->default_cursor;
      if (!cursor)
        return UWAC_ERROR_INTERNAL;
      image = cursor->images[0];
      if (!image)
        return UWAC_ERROR_INTERNAL;
      x = image->hotspot_x;
      y = image->hotspot_y;
      buffer = wl_cursor_image_get_buffer(image);
      if (!buffer)
        return UWAC_ERROR_INTERNAL;
      surface = seat->pointer_surface;
      break;
  }
 
  if (surface && buffer)
  {
    wl_surface_set_buffer_scale(surface, scale);
    wl_surface_attach(surface, buffer, 0, 0);
    wl_surface_damage(surface, 0, 0, image->width, image->height);
    wl_surface_commit(surface);
  }
 
  wl_pointer_set_cursor(seat->pointer, serial, surface, x, y);
 
  return UWAC_SUCCESS;
}
 
static void keyboard_repeat_func(UwacTask* task, uint32_t events)
{
  UwacSeat* input = container_of(task, UwacSeat, repeat_task);
  assert(input);
  UwacWindow* window = input->keyboard_focus;
  uint64_t exp = 0;
 
  if (read(input->repeat_timer_fd, &exp, sizeof exp) != sizeof exp)
    /* If we change the timer between the fd becoming
     * readable and getting here, there'll be nothing to
     * read and we get EAGAIN. */
    return;
 
  if (window)
  {
    UwacKeyEvent* key = NULL;
 
    key = (UwacKeyEvent*)UwacDisplayNewEvent(input->display, UWAC_EVENT_KEY);
    if (!key)
      return;
 
    key->window = window;
    key->sym = input->repeat_sym;
    key->raw_key = input->repeat_key;
    key->pressed = true;
    key->repeated = true;
  }
}
 
static void keyboard_handle_keymap(void* data, struct wl_keyboard* keyboard, uint32_t format,
                                   int fd, uint32_t size)
{
  UwacSeat* input = data;
  struct xkb_keymap* keymap = NULL;
  struct xkb_state* state = NULL;
  char* map_str = NULL;
  int mapFlags = MAP_SHARED;
 
  if (!data)
  {
    close(fd);
    return;
  }
 
  if (format != WL_KEYBOARD_KEYMAP_FORMAT_XKB_V1)
  {
    close(fd);
    return;
  }
 
  if (input->seat_version >= 7)
    mapFlags = MAP_PRIVATE;
 
  map_str = mmap(NULL, size, PROT_READ, mapFlags, fd, 0);
  if (map_str == MAP_FAILED)
  {
    close(fd);
    return;
  }
 
  keymap = xkb_keymap_new_from_string(input->xkb_context, map_str, XKB_KEYMAP_FORMAT_TEXT_V1, 0);
  munmap(map_str, size);
  close(fd);
 
  if (!keymap)
  {
    assert(uwacErrorHandler(input->display, UWAC_ERROR_INTERNAL, "failed to compile keymap\n"));
    return;
  }
 
  state = xkb_state_new(keymap);
  if (!state)
  {
    assert(
        uwacErrorHandler(input->display, UWAC_ERROR_NOMEMORY, "failed to create XKB state\n"));
    xkb_keymap_unref(keymap);
    return;
  }
 
  xkb_keymap_unref(input->xkb.keymap);
  xkb_state_unref(input->xkb.state);
  input->xkb.keymap = keymap;
  input->xkb.state = state;
 
  input->xkb.control_mask = 1 << xkb_keymap_mod_get_index(input->xkb.keymap, "Control");
  input->xkb.alt_mask = 1 << xkb_keymap_mod_get_index(input->xkb.keymap, "Mod1");
  input->xkb.shift_mask = 1 << xkb_keymap_mod_get_index(input->xkb.keymap, "Shift");
  input->xkb.caps_mask = 1 << xkb_keymap_mod_get_index(input->xkb.keymap, "Lock");
  input->xkb.num_mask = 1 << xkb_keymap_mod_get_index(input->xkb.keymap, "Mod2");
}
 
static void keyboard_handle_key(void* data, struct wl_keyboard* keyboard, uint32_t serial,
                                uint32_t time, uint32_t key, uint32_t state_w);
 
static void keyboard_handle_enter(void* data, struct wl_keyboard* keyboard, uint32_t serial,
                                  struct wl_surface* surface, struct wl_array* keys)
{
  UwacSeat* input = (UwacSeat*)data;
  assert(input);
 
  UwacKeyboardEnterLeaveEvent* event = (UwacKeyboardEnterLeaveEvent*)UwacDisplayNewEvent(
      input->display, UWAC_EVENT_KEYBOARD_ENTER);
  if (!event)
    return;
 
  event->window = input->keyboard_focus = (UwacWindow*)wl_surface_get_user_data(surface);
  event->seat = input;
 
  /* we may have the keys in the `keys` array, but as this function is called only
   * when the window gets focus, so there may be keys from other unrelated windows, eg.
   * this was leading to problems like passing CTRL+D to freerdp from closing terminal window
   * if it was closing very fast and the keys was still pressed by the user while the freerdp
   * gets focus
   *
   * currently just ignore this, as further key presses will be handled correctly anyway
   */
}
 
static void keyboard_handle_leave(void* data, struct wl_keyboard* keyboard, uint32_t serial,
                                  struct wl_surface* surface)
{
  struct itimerspec its = { 0 };
  uint32_t* pressedKey = NULL;
  size_t i = 0;
 
  UwacSeat* input = (UwacSeat*)data;
  assert(input);
 
  its.it_interval.tv_sec = 0;
  its.it_interval.tv_nsec = 0;
  its.it_value.tv_sec = 0;
  its.it_value.tv_nsec = 0;
  (void)timerfd_settime(input->repeat_timer_fd, 0, &its, NULL);
 
  UwacPointerEnterLeaveEvent* event =
      (UwacPointerEnterLeaveEvent*)UwacDisplayNewEvent(input->display, UWAC_EVENT_POINTER_LEAVE);
  if (!event)
    return;
 
  event->window = input->keyboard_focus;
 
  /* we are currently loosing input focus of the main window:
   * check if we currently have some keys pressed and release them as if we enter the window again
   * it will be still "virtually" pressed in remote even if in reality the key has been released
   */
  for (pressedKey = input->pressed_keys.data, i = 0; i < input->pressed_keys.size;
       i += sizeof(uint32_t))
  {
    keyboard_handle_key(data, keyboard, serial, 0, *pressedKey, WL_KEYBOARD_KEY_STATE_RELEASED);
    pressedKey++;
  }
}
 
static int update_key_pressed(UwacSeat* seat, uint32_t key)
{
  uint32_t* keyPtr = NULL;
  assert(seat);
 
  /* check if the key is not already pressed */
  wl_array_for_each(keyPtr, &seat->pressed_keys)
  {
    if (*keyPtr == key)
      return 1;
  }
 
  keyPtr = wl_array_add(&seat->pressed_keys, sizeof(uint32_t));
  if (!keyPtr)
    return -1;
 
  *keyPtr = key;
  return 0;
}
 
static int update_key_released(UwacSeat* seat, uint32_t key)
{
  size_t toMove = 0;
  bool found = false;
 
  assert(seat);
 
  size_t i = 0;
  uint32_t* keyPtr = seat->pressed_keys.data;
  for (; i < seat->pressed_keys.size; i++, keyPtr++)
  {
    if (*keyPtr == key)
    {
      found = true;
      break;
    }
  }
 
  if (found)
  {
    toMove = seat->pressed_keys.size - ((i + 1) * sizeof(uint32_t));
    if (toMove)
      memmove(keyPtr, keyPtr + 1, toMove);
 
    seat->pressed_keys.size -= sizeof(uint32_t);
  }
  return 1;
}
 
static void keyboard_handle_key(void* data, struct wl_keyboard* keyboard, uint32_t serial,
                                uint32_t time, uint32_t key, uint32_t state_w)
{
  UwacSeat* input = (UwacSeat*)data;
  assert(input);
 
  UwacWindow* window = input->keyboard_focus;
  UwacKeyEvent* keyEvent = NULL;
 
  uint32_t code = 0;
  uint32_t num_syms = 0;
  enum wl_keyboard_key_state state = state_w;
  const xkb_keysym_t* syms = NULL;
  xkb_keysym_t sym = 0;
  struct itimerspec its;
 
  if (state_w == WL_KEYBOARD_KEY_STATE_PRESSED)
    update_key_pressed(input, key);
  else
    update_key_released(input, key);
 
  input->display->serial = serial;
  code = key + 8;
  if (!window || !input->xkb.state)
    return;
 
  /* We only use input grabs for pointer events for now, so just
   * ignore key presses if a grab is active.  We expand the key
   * event delivery mechanism to route events to widgets to
   * properly handle key grabs.  In the meantime, this prevents
   * key event delivery while a grab is active. */
  /*if (input->grab && input->grab_button == 0)
      return;*/
 
  num_syms = xkb_state_key_get_syms(input->xkb.state, code, &syms);
 
  sym = XKB_KEY_NoSymbol;
  if (num_syms == 1)
    sym = syms[0];
 
  if (state == WL_KEYBOARD_KEY_STATE_RELEASED && key == input->repeat_key)
  {
    its.it_interval.tv_sec = 0;
    its.it_interval.tv_nsec = 0;
    its.it_value.tv_sec = 0;
    its.it_value.tv_nsec = 0;
    (void)timerfd_settime(input->repeat_timer_fd, 0, &its, NULL);
  }
  else if (state == WL_KEYBOARD_KEY_STATE_PRESSED &&
           xkb_keymap_key_repeats(input->xkb.keymap, code))
  {
    input->repeat_sym = sym;
    input->repeat_key = key;
    input->repeat_time = time;
    its.it_interval.tv_sec = input->repeat_rate_sec;
    its.it_interval.tv_nsec = input->repeat_rate_nsec;
    its.it_value.tv_sec = input->repeat_delay_sec;
    its.it_value.tv_nsec = input->repeat_delay_nsec;
    (void)timerfd_settime(input->repeat_timer_fd, 0, &its, NULL);
  }
 
  keyEvent = (UwacKeyEvent*)UwacDisplayNewEvent(input->display, UWAC_EVENT_KEY);
  if (!keyEvent)
    return;
 
  keyEvent->window = window;
  keyEvent->sym = sym;
  keyEvent->raw_key = key;
  keyEvent->pressed = (state == WL_KEYBOARD_KEY_STATE_PRESSED);
  keyEvent->repeated = false;
}
 
static void keyboard_handle_modifiers(void* data, struct wl_keyboard* keyboard, uint32_t serial,
                                      uint32_t mods_depressed, uint32_t mods_latched,
                                      uint32_t mods_locked, uint32_t group)
{
  UwacSeat* input = data;
  assert(input);
 
  UwacKeyboardModifiersEvent* event = NULL;
  xkb_mod_mask_t mask = 0;
 
  /* If we're not using a keymap, then we don't handle PC-style modifiers */
  if (!input->xkb.keymap)
    return;
 
  xkb_state_update_mask(input->xkb.state, mods_depressed, mods_latched, mods_locked, 0, 0, group);
  mask = xkb_state_serialize_mods(input->xkb.state, XKB_STATE_MODS_DEPRESSED |
                                                        XKB_STATE_MODS_LATCHED |
                                                        XKB_STATE_MODS_LOCKED);
  input->modifiers = 0;
  if (mask & input->xkb.control_mask)
    input->modifiers |= UWAC_MOD_CONTROL_MASK;
  if (mask & input->xkb.alt_mask)
    input->modifiers |= UWAC_MOD_ALT_MASK;
  if (mask & input->xkb.shift_mask)
    input->modifiers |= UWAC_MOD_SHIFT_MASK;
  if (mask & input->xkb.caps_mask)
    input->modifiers |= UWAC_MOD_CAPS_MASK;
  if (mask & input->xkb.num_mask)
    input->modifiers |= UWAC_MOD_NUM_MASK;
 
  event = (UwacKeyboardModifiersEvent*)UwacDisplayNewEvent(input->display,
                                                           UWAC_EVENT_KEYBOARD_MODIFIERS);
  if (!event)
    return;
 
  event->modifiers = input->modifiers;
}
 
static void set_repeat_info(UwacSeat* input, int32_t rate, int32_t delay)
{
  assert(input);
 
  input->repeat_rate_sec = input->repeat_rate_nsec = 0;
  input->repeat_delay_sec = input->repeat_delay_nsec = 0;
 
  /* a rate of zero disables any repeating, regardless of the delay's
   * value */
  if (rate == 0)
    return;
 
  if (rate == 1)
    input->repeat_rate_sec = 1;
  else
    input->repeat_rate_nsec = 1000000000 / rate;
 
  input->repeat_delay_sec = delay / 1000;
  delay -= (input->repeat_delay_sec * 1000);
  input->repeat_delay_nsec = delay * 1000 * 1000;
}
 
static void keyboard_handle_repeat_info(void* data, struct wl_keyboard* keyboard, int32_t rate,
                                        int32_t delay)
{
  UwacSeat* input = data;
  assert(input);
 
  set_repeat_info(input, rate, delay);
}
 
static const struct wl_keyboard_listener keyboard_listener = {
  keyboard_handle_keymap, keyboard_handle_enter,     keyboard_handle_leave,
  keyboard_handle_key,    keyboard_handle_modifiers, keyboard_handle_repeat_info
};
 
static bool touch_send_start_frame(UwacSeat* seat)
{
  assert(seat);
 
  UwacTouchFrameBegin* ev =
      (UwacTouchFrameBegin*)UwacDisplayNewEvent(seat->display, UWAC_EVENT_TOUCH_FRAME_BEGIN);
  if (!ev)
    return false;
 
  seat->touch_frame_started = true;
  return true;
}
 
static void touch_handle_down(void* data, struct wl_touch* wl_touch, uint32_t serial, uint32_t time,
                              struct wl_surface* surface, int32_t id, wl_fixed_t x_w,
                              wl_fixed_t y_w)
{
  UwacSeat* seat = data;
  UwacTouchDown* tdata = NULL;
 
  assert(seat);
  assert(seat->display);
 
  seat->display->serial = serial;
  if (!seat->touch_frame_started && !touch_send_start_frame(seat))
    return;
 
  tdata = (UwacTouchDown*)UwacDisplayNewEvent(seat->display, UWAC_EVENT_TOUCH_DOWN);
  if (!tdata)
    return;
 
  tdata->seat = seat;
  tdata->id = id;
 
  double sx = wl_fixed_to_double(x_w);
  double sy = wl_fixed_to_double(y_w);
 
  tdata->x = (wl_fixed_t)lround(sx);
  tdata->y = (wl_fixed_t)lround(sy);
 
#if 0
  struct widget *widget;
  float sx = wl_fixed_to_double(x);
  float sy = wl_fixed_to_double(y);
 
 
  input->touch_focus = wl_surface_get_user_data(surface);
  if (!input->touch_focus) {
    DBG("Failed to find to touch focus for surface %p\n", (void*) surface);
    return;
  }
 
  if (surface != input->touch_focus->main_surface->surface) {
    DBG("Ignoring input event from subsurface %p\n", (void*) surface);
    input->touch_focus = NULL;
    return;
  }
 
  if (input->grab)
    widget = input->grab;
  else
    widget = window_find_widget(input->touch_focus,
              wl_fixed_to_double(x),
              wl_fixed_to_double(y));
  if (widget) {
    struct touch_point *tp = xmalloc(sizeof *tp);
    if (tp) {
      tp->id = id;
      tp->widget = widget;
      tp->x = sx;
      tp->y = sy;
      wl_list_insert(&input->touch_point_list, &tp->link);
 
      if (widget->touch_down_handler)
        (*widget->touch_down_handler)(widget, input,
                    serial, time, id,
                    sx, sy,
                    widget->user_data);
    }
  }
#endif
}
 
static void touch_handle_up(void* data, struct wl_touch* wl_touch, uint32_t serial, uint32_t time,
                            int32_t id)
{
  UwacSeat* seat = data;
  UwacTouchUp* tdata = NULL;
 
  assert(seat);
 
  if (!seat->touch_frame_started && !touch_send_start_frame(seat))
    return;
 
  tdata = (UwacTouchUp*)UwacDisplayNewEvent(seat->display, UWAC_EVENT_TOUCH_UP);
  if (!tdata)
    return;
 
  tdata->seat = seat;
  tdata->id = id;
 
#if 0
  struct touch_point *tp, *tmp;
 
  if (!input->touch_focus) {
    DBG("No touch focus found for touch up event!\n");
    return;
  }
 
  wl_list_for_each_safe(tp, tmp, &input->touch_point_list, link) {
    if (tp->id != id)
      continue;
 
    if (tp->widget->touch_up_handler)
      (*tp->widget->touch_up_handler)(tp->widget, input, serial,
              time, id,
              tp->widget->user_data);
 
    wl_list_remove(&tp->link);
    free(tp);
 
    return;
  }
#endif
}
 
static void touch_handle_motion(void* data, struct wl_touch* wl_touch, uint32_t time, int32_t id,
                                wl_fixed_t x_w, wl_fixed_t y_w)
{
  UwacSeat* seat = data;
  assert(seat);
 
  UwacTouchMotion* tdata = NULL;
 
  if (!seat->touch_frame_started && !touch_send_start_frame(seat))
    return;
 
  tdata = (UwacTouchMotion*)UwacDisplayNewEvent(seat->display, UWAC_EVENT_TOUCH_MOTION);
  if (!tdata)
    return;
 
  tdata->seat = seat;
  tdata->id = id;
 
  double sx = wl_fixed_to_double(x_w);
  double sy = wl_fixed_to_double(y_w);
 
  tdata->x = (wl_fixed_t)lround(sx);
  tdata->y = (wl_fixed_t)lround(sy);
 
#if 0
  struct touch_point *tp;
  float sx = wl_fixed_to_double(x);
  float sy = wl_fixed_to_double(y);
 
  DBG("touch_handle_motion: %i %i\n", id, wl_list_length(&seat->touch_point_list));
 
  if (!seat->touch_focus) {
    DBG("No touch focus found for touch motion event!\n");
    return;
  }
 
  wl_list_for_each(tp, &seat->touch_point_list, link) {
    if (tp->id != id)
      continue;
 
    tp->x = sx;
    tp->y = sy;
    if (tp->widget->touch_motion_handler)
      (*tp->widget->touch_motion_handler)(tp->widget, seat, time,
                  id, sx, sy,
                  tp->widget->user_data);
    return;
  }
#endif
}
 
static void touch_handle_frame(void* data, struct wl_touch* wl_touch)
{
  UwacSeat* seat = data;
  assert(seat);
 
  UwacTouchFrameEnd* ev =
      (UwacTouchFrameEnd*)UwacDisplayNewEvent(seat->display, UWAC_EVENT_TOUCH_FRAME_END);
  if (!ev)
    return;
 
  ev->seat = seat;
  seat->touch_frame_started = false;
}
 
static void touch_handle_cancel(void* data, struct wl_touch* wl_touch)
{
  UwacSeat* seat = data;
  assert(seat);
 
  UwacTouchCancel* ev =
      (UwacTouchCancel*)UwacDisplayNewEvent(seat->display, UWAC_EVENT_TOUCH_CANCEL);
  if (!ev)
    return;
 
  ev->seat = seat;
  seat->touch_frame_started = false;
 
#if 0
  struct touch_point *tp, *tmp;
 
  DBG("touch_handle_cancel\n");
 
  if (!input->touch_focus) {
    DBG("No touch focus found for touch cancel event!\n");
    return;
  }
 
  wl_list_for_each_safe(tp, tmp, &input->touch_point_list, link) {
    if (tp->widget->touch_cancel_handler)
      (*tp->widget->touch_cancel_handler)(tp->widget, input,
                  tp->widget->user_data);
 
    wl_list_remove(&tp->link);
    free(tp);
  }
#endif
}
 
static void touch_handle_shape(void* data, struct wl_touch* wl_touch, int32_t id, wl_fixed_t major,
                               wl_fixed_t minor)
{
  UwacSeat* seat = data;
  assert(seat);
 
  // TODO
}
 
static void touch_handle_orientation(void* data, struct wl_touch* wl_touch, int32_t id,
                                     wl_fixed_t orientation)
{
  UwacSeat* seat = data;
  assert(seat);
 
  // TODO
}
 
static const struct wl_touch_listener touch_listener = {
  touch_handle_down,   touch_handle_up,    touch_handle_motion,     touch_handle_frame,
  touch_handle_cancel, touch_handle_shape, touch_handle_orientation
};
 
static void pointer_handle_enter(void* data, struct wl_pointer* pointer, uint32_t serial,
                                 struct wl_surface* surface, wl_fixed_t sx_w, wl_fixed_t sy_w)
{
  UwacSeat* input = data;
  UwacWindow* window = NULL;
  UwacPointerEnterLeaveEvent* event = NULL;
 
  assert(input);
 
  double sx = wl_fixed_to_double(sx_w);
  double sy = wl_fixed_to_double(sy_w);
 
  if (!surface)
  {
    /* enter event for a window we've just destroyed */
    return;
  }
 
  input->display->serial = serial;
  input->display->pointer_focus_serial = serial;
  window = wl_surface_get_user_data(surface);
  if (window)
    window->pointer_enter_serial = serial;
  input->pointer_focus = window;
  input->sx = sx;
  input->sy = sy;
 
  event =
      (UwacPointerEnterLeaveEvent*)UwacDisplayNewEvent(input->display, UWAC_EVENT_POINTER_ENTER);
  if (!event)
    return;
 
  event->seat = input;
  event->window = window;
  event->x = (uint32_t)lround(sx);
  event->y = (uint32_t)lround(sy);
 
  /* Apply cursor theme */
  set_cursor_image(input, serial);
}
 
static void pointer_handle_leave(void* data, struct wl_pointer* pointer, uint32_t serial,
                                 struct wl_surface* surface)
{
  UwacPointerEnterLeaveEvent* event = NULL;
  UwacWindow* window = NULL;
  UwacSeat* input = data;
  assert(input);
 
  input->display->serial = serial;
 
  event =
      (UwacPointerEnterLeaveEvent*)UwacDisplayNewEvent(input->display, UWAC_EVENT_POINTER_LEAVE);
  if (!event)
    return;
 
  window = wl_surface_get_user_data(surface);
 
  event->seat = input;
  event->window = window;
}
 
static void pointer_handle_motion(void* data, struct wl_pointer* pointer, uint32_t time,
                                  wl_fixed_t sx_w, wl_fixed_t sy_w)
{
  UwacPointerMotionEvent* motion_event = NULL;
  UwacSeat* input = data;
  assert(input);
 
  UwacWindow* window = input->pointer_focus;
  if (!window || !window->display)
    return;
 
  int scale = window->display->actual_scale;
  int sx_i = wl_fixed_to_int(sx_w) * scale;
  int sy_i = wl_fixed_to_int(sy_w) * scale;
  double sx_d = wl_fixed_to_double(sx_w) * scale;
  double sy_d = wl_fixed_to_double(sy_w) * scale;
 
  if ((sx_i < 0) || (sy_i < 0))
    return;
 
  input->sx = sx_d;
  input->sy = sy_d;
 
  motion_event =
      (UwacPointerMotionEvent*)UwacDisplayNewEvent(input->display, UWAC_EVENT_POINTER_MOTION);
  if (!motion_event)
    return;
 
  motion_event->seat = input;
  motion_event->window = window;
  motion_event->x = sx_i;
  motion_event->y = sy_i;
}
 
static void pointer_handle_button(void* data, struct wl_pointer* pointer, uint32_t serial,
                                  uint32_t time, uint32_t button, uint32_t state_w)
{
  UwacPointerButtonEvent* event = NULL;
  UwacSeat* seat = data;
  assert(seat);
 
  UwacWindow* window = seat->pointer_focus;
 
  seat->display->serial = serial;
 
  event = (UwacPointerButtonEvent*)UwacDisplayNewEvent(seat->display, UWAC_EVENT_POINTER_BUTTONS);
  if (!event)
    return;
 
  event->seat = seat;
  event->window = window;
  event->x = (uint32_t)lround(seat->sx);
  event->y = (uint32_t)lround(seat->sy);
  event->button = button;
  event->state = (enum wl_pointer_button_state)state_w;
}
 
static void pointer_handle_axis(void* data, struct wl_pointer* pointer, uint32_t time,
                                uint32_t axis, wl_fixed_t value)
{
  UwacPointerAxisEvent* event = NULL;
  UwacSeat* seat = data;
  assert(seat);
 
  UwacWindow* window = seat->pointer_focus;
 
  if (!window)
    return;
 
  event = (UwacPointerAxisEvent*)UwacDisplayNewEvent(seat->display, UWAC_EVENT_POINTER_AXIS);
  if (!event)
    return;
 
  event->seat = seat;
  event->window = window;
  event->x = (uint32_t)lround(seat->sx);
  event->y = (uint32_t)lround(seat->sy);
  event->axis = axis;
  event->value = value;
}
 
static void pointer_frame(void* data, struct wl_pointer* wl_pointer)
{
  UwacPointerFrameEvent* event = NULL;
  UwacSeat* seat = data;
  assert(seat);
 
  UwacWindow* window = seat->pointer_focus;
 
  if (!window)
    return;
 
  event = (UwacPointerFrameEvent*)UwacDisplayNewEvent(seat->display, UWAC_EVENT_POINTER_FRAME);
  if (!event)
    return;
 
  event->seat = seat;
  event->window = window;
}
 
static void pointer_axis_source(void* data, struct wl_pointer* wl_pointer, uint32_t axis_source)
{
  UwacPointerSourceEvent* event = NULL;
  UwacSeat* seat = data;
  assert(seat);
 
  UwacWindow* window = seat->pointer_focus;
 
  if (!window)
    return;
 
  event = (UwacPointerSourceEvent*)UwacDisplayNewEvent(seat->display, UWAC_EVENT_POINTER_SOURCE);
  if (!event)
    return;
 
  event->seat = seat;
  event->window = window;
  event->axis_source = axis_source;
}
 
static void pointer_axis_stop(void* data, struct wl_pointer* wl_pointer, uint32_t time,
                              uint32_t axis)
{
  UwacSeat* seat = data;
  assert(seat);
}
 
static void pointer_axis_discrete(void* data, struct wl_pointer* wl_pointer, uint32_t axis,
                                  int32_t discrete)
{
  /*UwacSeat *seat = data;*/
  UwacPointerAxisEvent* event = NULL;
  UwacSeat* seat = data;
  assert(seat);
 
  UwacWindow* window = seat->pointer_focus;
 
  if (!window)
    return;
 
  event =
      (UwacPointerAxisEvent*)UwacDisplayNewEvent(seat->display, UWAC_EVENT_POINTER_AXIS_DISCRETE);
  if (!event)
    return;
 
  event->seat = seat;
  event->window = window;
  event->x = (uint32_t)lround(seat->sx);
  event->y = (uint32_t)lround(seat->sy);
  event->axis = axis;
  event->value = discrete;
}
 
static void pointer_axis_value120(void* data, struct wl_pointer* wl_pointer, uint32_t axis,
                                  int32_t value120)
{
  /*UwacSeat *seat = data;*/
  UwacPointerAxisEvent* event = NULL;
  UwacSeat* seat = data;
  assert(seat);
 
  UwacWindow* window = seat->pointer_focus;
 
  if (!window)
    return;
 
  event =
      (UwacPointerAxisEvent*)UwacDisplayNewEvent(seat->display, UWAC_EVENT_POINTER_AXIS_DISCRETE);
  if (!event)
    return;
 
  event->seat = seat;
  event->window = window;
  event->x = (uint32_t)lround(seat->sx);
  event->y = (uint32_t)lround(seat->sy);
  event->axis = axis;
  event->value = value120 / 120;
}
 
static const struct wl_pointer_listener pointer_listener = {
  pointer_handle_enter,  pointer_handle_leave, pointer_handle_motion, pointer_handle_button,
  pointer_handle_axis,   pointer_frame,        pointer_axis_source,   pointer_axis_stop,
  pointer_axis_discrete, pointer_axis_value120
};
 
static void seat_handle_capabilities(void* data, struct wl_seat* seat, uint32_t caps)
{
  UwacSeat* input = data;
  assert(input);
 
  if ((caps & WL_SEAT_CAPABILITY_POINTER) && !input->pointer)
  {
    input->pointer = wl_seat_get_pointer(seat);
    wl_pointer_set_user_data(input->pointer, input);
    wl_pointer_add_listener(input->pointer, &pointer_listener, input);
 
    input->cursor_theme = wl_cursor_theme_load(NULL, 32, input->display->shm);
    if (!input->cursor_theme)
    {
      assert(uwacErrorHandler(input->display, UWAC_ERROR_NOMEMORY,
                              "unable to get wayland cursor theme\n"));
      return;
    }
 
    input->default_cursor = wl_cursor_theme_get_cursor(input->cursor_theme, "left_ptr");
    if (!input->default_cursor)
    {
      assert(uwacErrorHandler(input->display, UWAC_ERROR_NOMEMORY,
                              "unable to get wayland cursor left_ptr\n"));
      return;
    }
  }
  else if (!(caps & WL_SEAT_CAPABILITY_POINTER) && input->pointer)
  {
#ifdef WL_POINTER_RELEASE_SINCE_VERSION
    if (input->seat_version >= WL_POINTER_RELEASE_SINCE_VERSION)
      wl_pointer_release(input->pointer);
    else
#endif
      wl_pointer_destroy(input->pointer);
    if (input->cursor_theme)
      wl_cursor_theme_destroy(input->cursor_theme);
 
    input->default_cursor = NULL;
    input->cursor_theme = NULL;
    input->pointer = NULL;
  }
 
  if ((caps & WL_SEAT_CAPABILITY_KEYBOARD) && !input->keyboard)
  {
    input->keyboard = wl_seat_get_keyboard(seat);
    wl_keyboard_set_user_data(input->keyboard, input);
    wl_keyboard_add_listener(input->keyboard, &keyboard_listener, input);
  }
  else if (!(caps & WL_SEAT_CAPABILITY_KEYBOARD) && input->keyboard)
  {
#ifdef WL_KEYBOARD_RELEASE_SINCE_VERSION
    if (input->seat_version >= WL_KEYBOARD_RELEASE_SINCE_VERSION)
      wl_keyboard_release(input->keyboard);
    else
#endif
      wl_keyboard_destroy(input->keyboard);
    input->keyboard = NULL;
  }
 
  if ((caps & WL_SEAT_CAPABILITY_TOUCH) && !input->touch)
  {
    input->touch = wl_seat_get_touch(seat);
    wl_touch_set_user_data(input->touch, input);
    wl_touch_add_listener(input->touch, &touch_listener, input);
  }
  else if (!(caps & WL_SEAT_CAPABILITY_TOUCH) && input->touch)
  {
#ifdef WL_TOUCH_RELEASE_SINCE_VERSION
    if (input->seat_version >= WL_TOUCH_RELEASE_SINCE_VERSION)
      wl_touch_release(input->touch);
    else
#endif
      wl_touch_destroy(input->touch);
    input->touch = NULL;
  }
}
 
static void seat_handle_name(void* data, struct wl_seat* seat, const char* name)
{
  UwacSeat* input = data;
  assert(input);
 
  if (input->name)
    free(input->name);
 
  input->name = strdup(name);
  if (!input->name)
    assert(uwacErrorHandler(input->display, UWAC_ERROR_NOMEMORY,
                            "unable to strdup seat's name\n"));
}
 
static const struct wl_seat_listener seat_listener = { seat_handle_capabilities, seat_handle_name };
 
UwacSeat* UwacSeatNew(UwacDisplay* d, uint32_t id, uint32_t version)
{
  UwacSeat* ret = xzalloc(sizeof(UwacSeat));
  if (!ret)
    return NULL;
 
  ret->display = d;
  ret->seat_id = id;
  ret->seat_version = version;
 
  wl_array_init(&ret->pressed_keys);
  ret->xkb_context = xkb_context_new(0);
  if (!ret->xkb_context)
  {
    (void)fprintf(stderr, "%s: unable to allocate a xkb_context\n", __func__);
    goto fail;
  }
 
  ret->seat = wl_registry_bind(d->registry, id, &wl_seat_interface, version);
  wl_seat_add_listener(ret->seat, &seat_listener, ret);
  wl_seat_set_user_data(ret->seat, ret);
 
  ret->repeat_timer_fd = timerfd_create(CLOCK_MONOTONIC, TFD_CLOEXEC | TFD_NONBLOCK);
  if (ret->repeat_timer_fd < 0)
  {
    (void)fprintf(stderr, "%s: error creating repeat timer\n", __func__);
    goto fail;
  }
  ret->repeat_task.run = keyboard_repeat_func;
  if (UwacDisplayWatchFd(d, ret->repeat_timer_fd, EPOLLIN, &ret->repeat_task) < 0)
  {
    (void)fprintf(stderr, "%s: error polling repeat timer\n", __func__);
    goto fail;
  }
 
  wl_list_insert(d->seats.prev, &ret->link);
  return ret;
 
fail:
  UwacSeatDestroy(ret);
  return NULL;
}
 
void UwacSeatDestroy(UwacSeat* s)
{
  if (!s)
    return;
 
  UwacSeatInhibitShortcuts(s, false);
  if (s->seat)
  {
#ifdef WL_SEAT_RELEASE_SINCE_VERSION
    if (s->seat_version >= WL_SEAT_RELEASE_SINCE_VERSION)
      wl_seat_release(s->seat);
    else
#endif
      wl_seat_destroy(s->seat);
  }
  s->seat = NULL;
 
  free(s->name);
  wl_array_release(&s->pressed_keys);
 
  xkb_state_unref(s->xkb.state);
  xkb_context_unref(s->xkb_context);
 
  if (s->pointer)
  {
#ifdef WL_POINTER_RELEASE_SINCE_VERSION
    if (s->seat_version >= WL_POINTER_RELEASE_SINCE_VERSION)
      wl_pointer_release(s->pointer);
    else
#endif
      wl_pointer_destroy(s->pointer);
  }
 
  if (s->touch)
  {
#ifdef WL_TOUCH_RELEASE_SINCE_VERSION
    if (s->seat_version >= WL_TOUCH_RELEASE_SINCE_VERSION)
      wl_touch_release(s->touch);
    else
#endif
      wl_touch_destroy(s->touch);
  }
 
  if (s->keyboard)
  {
#ifdef WL_KEYBOARD_RELEASE_SINCE_VERSION
    if (s->seat_version >= WL_KEYBOARD_RELEASE_SINCE_VERSION)
      wl_keyboard_release(s->keyboard);
    else
#endif
      wl_keyboard_destroy(s->keyboard);
  }
 
  if (s->data_device)
    wl_data_device_destroy(s->data_device);
 
  if (s->data_source)
    wl_data_source_destroy(s->data_source);
 
  if (s->pointer_surface)
    wl_surface_destroy(s->pointer_surface);
 
  free(s->pointer_image);
  free(s->pointer_data);
 
  wl_list_remove(&s->link);
  free(s);
}
 
const char* UwacSeatGetName(const UwacSeat* seat)
{
  assert(seat);
  return seat->name;
}
 
UwacSeatId UwacSeatGetId(const UwacSeat* seat)
{
  assert(seat);
  return seat->seat_id;
}
 
UwacReturnCode UwacSeatInhibitShortcuts(UwacSeat* s, bool inhibit)
{
  if (!s)
    return UWAC_ERROR_CLOSED;
 
  if (s->keyboard_inhibitor)
  {
    zwp_keyboard_shortcuts_inhibitor_v1_destroy(s->keyboard_inhibitor);
    s->keyboard_inhibitor = NULL;
  }
  if (inhibit && s->display && s->display->keyboard_inhibit_manager)
    s->keyboard_inhibitor = zwp_keyboard_shortcuts_inhibit_manager_v1_inhibit_shortcuts(
        s->display->keyboard_inhibit_manager, s->keyboard_focus->surface, s->seat);
 
  if (inhibit && !s->keyboard_inhibitor)
    return UWAC_ERROR_INTERNAL;
  return UWAC_SUCCESS;
}
 
UwacReturnCode UwacSeatSetMouseCursor(UwacSeat* seat, const void* data, size_t length, size_t width,
                                      size_t height, size_t hot_x, size_t hot_y)
{
  if (!seat)
    return UWAC_ERROR_CLOSED;
 
  free(seat->pointer_image);
  seat->pointer_image = NULL;
 
  free(seat->pointer_data);
  seat->pointer_data = NULL;
  seat->pointer_size = 0;
 
  /* There is a cursor provided */
  if ((data != NULL) && (length != 0))
  {
    seat->pointer_image = xzalloc(sizeof(struct wl_cursor_image));
    if (!seat->pointer_image)
      return UWAC_ERROR_NOMEMORY;
    seat->pointer_image->width = width;
    seat->pointer_image->height = height;
    seat->pointer_image->hotspot_x = hot_x;
    seat->pointer_image->hotspot_y = hot_y;
 
    free(seat->pointer_data);
    seat->pointer_data = xmalloc(length);
    memcpy(seat->pointer_data, data, length);
    seat->pointer_size = length;
 
    seat->pointer_type = 2;
  }
  /* We want to use the system cursor */
  else if (length != 0)
  {
    seat->pointer_type = 0;
  }
  /* Hide the cursor */
  else
  {
    seat->pointer_type = 1;
  }
  if (seat && !seat->default_cursor)
    return UWAC_SUCCESS;
  return set_cursor_image(seat, seat->display->pointer_focus_serial);
}