backends/native: Update keyboard a11y status in seat impl

Instead of going through the event queue, stage handling code, and
back to the input device via a vmethod call, do this directly in the
MetaSeatImpl. This is not too different from X11, where everything
happens inside the backend.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1403>

clutter/clutter/clutter-input-device.h

@@ -34,9 +34,6 @@
 
 G_BEGIN_DECLS
 
-typedef void (*ClutterEmitInputDeviceEvent) (ClutterEvent       *event,
-                                             ClutterInputDevice *device);
-
 struct _ClutterInputDeviceClass
 {
   GObjectClass parent_class;
@@ -53,11 +50,6 @@ struct _ClutterInputDeviceClass
   int (* get_pad_feature_group) (ClutterInputDevice           *device,
                                  ClutterInputDevicePadFeature  feature,
                                  int                           n_feature);
-
-  /* Keyboard accessbility */
-  void (* process_kbd_a11y_event) (ClutterEvent               *event,
-                                   ClutterInputDevice         *device,
-                                   ClutterEmitInputDeviceEvent emit_event_func);
 };
 
 #define CLUTTER_TYPE_INPUT_DEVICE               (clutter_input_device_get_type ())

clutter/clutter/clutter-main.c

@@ -1488,7 +1488,7 @@ emit_touch_event (ClutterEvent       *event,
 }
 
 static inline void
-emit_keyboard_event (ClutterEvent       *event,
+process_key_event (ClutterEvent       *event,
                    ClutterInputDevice *device)
 {
   if (_clutter_event_process_filters (event))
@@ -1500,21 +1500,6 @@ emit_keyboard_event (ClutterEvent       *event,
     emit_event_chain (event);
 }
 
-static inline void
-process_key_event (ClutterEvent       *event,
-                   ClutterInputDevice *device)
-{
-  ClutterInputDeviceClass *device_class = CLUTTER_INPUT_DEVICE_GET_CLASS (device);
-
-  if (device_class->process_kbd_a11y_event)
-    {
-      device_class->process_kbd_a11y_event (event, device, emit_keyboard_event);
-      return;
-    }
-
-  emit_keyboard_event (event, device);
-}
-
 static gboolean
 is_off_stage (ClutterActor *stage,
               gfloat        x,

src/backends/native/meta-input-device-native.c

@@ -48,7 +48,6 @@ typedef struct _SlowKeysEventPending
 {
   MetaInputDeviceNative *device;
   ClutterEvent *event;
-  ClutterEmitInputDeviceEvent emit_event_func;
   guint timer;
 } SlowKeysEventPending;
 
@@ -242,8 +241,7 @@ trigger_slow_keys (gpointer data)
 
   /* 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_event_push (slow_keys_event->event, TRUE);
-                                    CLUTTER_INPUT_DEVICE (device));
 
   /* Then remote the pending event */
   device->slow_keys_list = g_list_remove (device->slow_keys_list, slow_keys_event);
@@ -266,21 +264,19 @@ find_pending_event_by_keycode (gconstpointer a,
   return kb->hardware_keycode - ka->hardware_keycode;
 }
 
-static void
+static gboolean
 start_slow_keys (ClutterEvent          *event,
-                 MetaInputDeviceNative       *device,
+                 MetaInputDeviceNative *device)
-                 ClutterEmitInputDeviceEvent  emit_event_func)
 {
   SlowKeysEventPending *slow_keys_event;
   ClutterKeyEvent *key_event = (ClutterKeyEvent *) event;
 
   if (key_event->flags & CLUTTER_EVENT_FLAG_REPEATED)
-    return;
+    return TRUE;
 
   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,
@@ -289,12 +285,13 @@ start_slow_keys (ClutterEvent                *event,
 
   if (device->a11y_flags & META_A11Y_SLOW_KEYS_BEEP_PRESS)
     meta_input_device_native_bell_notify (device);
+
+  return TRUE;
 }
 
-static void
+static gboolean
 stop_slow_keys (ClutterEvent          *event,
-                MetaInputDeviceNative       *device,
+                MetaInputDeviceNative *device)
-                ClutterEmitInputDeviceEvent  emit_event_func)
 {
   GList *item;
 
@@ -310,11 +307,11 @@ stop_slow_keys (ClutterEvent                *event,
       if (device->a11y_flags & META_A11Y_SLOW_KEYS_BEEP_REJECT)
         meta_input_device_native_bell_notify (device);
 
-      return;
+      return TRUE;
     }
 
   /* If no key press event was pending, just emit the key release as-is */
-  emit_event_func (event, CLUTTER_INPUT_DEVICE (device));
+  return FALSE;
 }
 
 static guint
@@ -1105,17 +1102,12 @@ handle_mousekeys_release (ClutterEvent          *event,
   return FALSE;
 }
 
-static void
+gboolean
-meta_input_device_native_process_kbd_a11y_event (ClutterEvent               *event,
+meta_input_device_native_process_kbd_a11y_event (ClutterInputDevice *device,
-                                                 ClutterInputDevice         *device,
+                                                 ClutterEvent       *event)
-                                                 ClutterEmitInputDeviceEvent emit_event_func)
 {
   MetaInputDeviceNative *device_evdev = META_INPUT_DEVICE_NATIVE (device);
 
-  /* Ignore key events injected from IM */
-  if (event->key.flags & CLUTTER_EVENT_FLAG_INPUT_METHOD)
-    goto emit_event;
-
   if (device_evdev->a11y_flags & META_A11Y_KEYBOARD_ENABLED)
     {
       if (event->type == CLUTTER_KEY_PRESS)
@@ -1128,10 +1120,10 @@ meta_input_device_native_process_kbd_a11y_event (ClutterEvent               *eve
     {
       if (event->type == CLUTTER_KEY_PRESS &&
           handle_mousekeys_press (event, device_evdev))
-        return; /* swallow event */
+        return TRUE; /* swallow event */
       if (event->type == CLUTTER_KEY_RELEASE &&
           handle_mousekeys_release (event, device_evdev))
-        return; /* swallow event */
+        return TRUE; /* swallow event */
     }
 
   if ((device_evdev->a11y_flags & META_A11Y_BOUNCE_KEYS_ENABLED) &&
@@ -1141,7 +1133,7 @@ meta_input_device_native_process_kbd_a11y_event (ClutterEvent               *eve
         {
           notify_bounce_keys_reject (device_evdev);
 
-          return;
+          return TRUE;
         }
       else if (event->type == CLUTTER_KEY_RELEASE)
         start_bounce_keys (event, device_evdev);
@@ -1151,11 +1143,9 @@ meta_input_device_native_process_kbd_a11y_event (ClutterEvent               *eve
       (get_slow_keys_delay (device) != 0))
     {
       if (event->type == CLUTTER_KEY_PRESS)
-        start_slow_keys (event, device_evdev, emit_event_func);
+        return start_slow_keys (event, device_evdev);
       else if (event->type == CLUTTER_KEY_RELEASE)
-        stop_slow_keys (event, device_evdev, emit_event_func);
+        return stop_slow_keys (event, device_evdev);
-
-      return;
     }
 
   if (device_evdev->a11y_flags & META_A11Y_STICKY_KEYS_ENABLED)
@@ -1166,8 +1156,7 @@ meta_input_device_native_process_kbd_a11y_event (ClutterEvent               *eve
         handle_stickykeys_release (event, device_evdev);
     }
 
-emit_event:
+  return FALSE;
-  emit_event_func (event, device);
 }
 
 void
@@ -1230,7 +1219,6 @@ meta_input_device_native_class_init (MetaInputDeviceNativeClass *klass)
   device_class->get_group_n_modes = meta_input_device_native_get_group_n_modes;
   device_class->is_grouped = meta_input_device_native_is_grouped;
   device_class->get_pad_feature_group = meta_input_device_native_get_pad_feature_group;
-  device_class->process_kbd_a11y_event = meta_input_device_native_process_kbd_a11y_event;
 
   obj_props[PROP_DEVICE_MATRIX] =
     g_param_spec_boxed ("device-matrix",

src/backends/native/meta-input-device-native.h

@@ -149,5 +149,7 @@ void                     meta_input_device_native_set_coords (MetaInputDeviceNat
 void                     meta_input_device_native_get_coords (MetaInputDeviceNative *device_native,
                                                               float                 *x,
                                                               float                 *y);
+gboolean                 meta_input_device_native_process_kbd_a11y_event (ClutterInputDevice *device,
+                                                                          ClutterEvent       *event);
 
 #endif /* META_INPUT_DEVICE_NATIVE_H */

src/backends/native/meta-seat-impl.c

@@ -320,6 +320,7 @@ meta_seat_impl_notify_key (MetaSeatImpl       *seat_impl,
 {
   ClutterEvent *event = NULL;
   enum xkb_state_component changed_state;
+  uint32_t keycode;
 
   if (state != AUTOREPEAT_VALUE)
     {
@@ -342,12 +343,13 @@ meta_seat_impl_notify_key (MetaSeatImpl       *seat_impl,
                                          us2ms (time_us), key, state);
   meta_event_native_set_event_code (event, key);
 
+  keycode = meta_xkb_evdev_to_keycode (key);
+
   /* We must be careful and not pass multiple releases to xkb, otherwise it gets
      confused and locks the modifiers */
   if (state != AUTOREPEAT_VALUE)
     {
-      changed_state = xkb_state_update_key (seat_impl->xkb,
+      changed_state = xkb_state_update_key (seat_impl->xkb, keycode,
-                                            event->key.hardware_keycode,
                                             state ? XKB_KEY_DOWN : XKB_KEY_UP);
     }
   else
@@ -356,7 +358,11 @@ meta_seat_impl_notify_key (MetaSeatImpl       *seat_impl,
       clutter_event_set_flags (event, CLUTTER_EVENT_FLAG_REPEATED);
     }
 
+  if (!meta_input_device_native_process_kbd_a11y_event (seat_impl->core_keyboard,
+                                                        event))
     queue_event (seat_impl, event);
+  else
+    clutter_event_free (event);
 
   if (update_keys && (changed_state & XKB_STATE_LEDS))
     {
@@ -380,7 +386,7 @@ meta_seat_impl_notify_key (MetaSeatImpl       *seat_impl,
   if (state == 0 ||             /* key release */
       !seat_impl->repeat ||
       !xkb_keymap_key_repeats (xkb_state_get_keymap (seat_impl->xkb),
-                               event->key.hardware_keycode))
+                               keycode))
     {
       meta_seat_impl_clear_repeat_timer (seat_impl);
       return;

src/backends/native/meta-xkb-utils.c

@@ -62,7 +62,7 @@ meta_key_event_new_from_evdev (ClutterInputDevice *device,
    * 0, whereas X11's minimum keycode, for really stupid reasons, is 8.
    * So the evdev XKB rules are based on the keycodes all being shifted
    * upwards by 8. */
-  key += 8;
+  key = meta_xkb_evdev_to_keycode (key);
 
   n = xkb_key_get_syms (xkb_state, key, &syms);
   if (n == 1)
@@ -128,3 +128,10 @@ meta_xkb_keycode_to_evdev (uint32_t xkb_keycode)
    */
   return xkb_keycode - 8;
 }
+
+uint32_t
+meta_xkb_evdev_to_keycode (uint32_t evcode)
+{
+  /* The inverse of meta_xkb_keycode_to_evdev */
+  return evcode + 8;
+}

src/backends/native/meta-xkb-utils.h

@@ -38,5 +38,6 @@ void               meta_xkb_translate_state     (ClutterEvent       *event,
 ClutterModifierType meta_xkb_translate_modifiers (struct xkb_state    *state,
                                                   ClutterModifierType  button_state);
 uint32_t meta_xkb_keycode_to_evdev (uint32_t hardware_keycode);
+uint32_t meta_xkb_evdev_to_keycode (uint32_t evcode);
 
 #endif /* META_XKB_UTILS_H */