Implement ext-session-lock-v1

include/sway/input/seat.h

@@ -185,6 +185,10 @@ struct sway_workspace *seat_get_last_known_workspace(struct sway_seat *seat);
 
 struct sway_container *seat_get_focused_container(struct sway_seat *seat);
 
+// Force focus to a particular surface that is not part of the workspace
+// hierarchy (used for lockscreen)
+void sway_force_focus(struct wlr_surface *surface);
+
 /**
  * Return the last container to be focused for the seat (or the most recently
  * opened if no container has received focused) that is a child of the given

include/sway/server.h

@@ -16,6 +16,7 @@
 #include <wlr/types/wlr_output_power_management_v1.h>
 #include <wlr/types/wlr_presentation_time.h>
 #include <wlr/types/wlr_relative_pointer_v1.h>
+#include <wlr/types/wlr_session_lock_v1.h>
 #include <wlr/types/wlr_server_decoration.h>
 #include <wlr/types/wlr_text_input_v3.h>
 #include <wlr/types/wlr_xdg_shell.h>
@@ -89,6 +90,19 @@ struct sway_server {
 	struct wl_listener output_manager_apply;
 	struct wl_listener output_manager_test;
 
+	struct {
+		bool locked;
+		struct wlr_session_lock_manager_v1 *manager;
+
+		struct wlr_session_lock_v1 *lock;
+		struct wl_listener lock_new_surface;
+		struct wl_listener lock_unlock;
+		struct wl_listener lock_destroy;
+
+		struct wl_listener new_lock;
+		struct wl_listener manager_destroy;
+	} session_lock;
+
 	struct wlr_output_power_manager_v1 *output_power_manager_v1;
 	struct wl_listener output_power_manager_set_mode;
 	struct wlr_input_method_manager_v2 *input_method;
@@ -148,6 +162,7 @@ void handle_new_output(struct wl_listener *listener, void *data);
 
 void handle_idle_inhibitor_v1(struct wl_listener *listener, void *data);
 void handle_layer_shell_surface(struct wl_listener *listener, void *data);
+void sway_session_lock_init(void);
 void handle_xdg_shell_surface(struct wl_listener *listener, void *data);
 #if HAVE_XWAYLAND
 void handle_xwayland_surface(struct wl_listener *listener, void *data);

sway/desktop/output.c

@@ -275,6 +275,25 @@ static void for_each_surface_container_iterator(struct sway_container *con,
 
 static void output_for_each_surface(struct sway_output *output,
 		sway_surface_iterator_func_t iterator, void *user_data) {
+	if (server.session_lock.locked) {
+		if (server.session_lock.lock == NULL) {
+			return;
+		}
+		struct wlr_session_lock_surface_v1 *lock_surface;
+		wl_list_for_each(lock_surface, &server.session_lock.lock->surfaces, link) {
+			if (lock_surface->output != output->wlr_output) {
+				continue;
+			}
+			if (!lock_surface->mapped) {
+				continue;
+			}
+
+			output_surface_for_each_surface(output, lock_surface->surface,
+				0.0, 0.0, iterator, user_data);
+		}
+		return;
+	}
+
 	if (output_has_opaque_overlay_layer_surface(output)) {
 		goto overlay;
 	}

sway/desktop/render.c

@@ -1056,6 +1056,41 @@ void output_render(struct sway_output *output, struct timespec *when,
 		wlr_renderer_clear(renderer, (float[]){1, 1, 0, 1});
 	}
 
+	if (server.session_lock.locked) {
+		float clear_color[] = {0.0f, 0.0f, 0.0f, 1.0f};
+		if (server.session_lock.lock == NULL) {
+			// abandoned lock -> red BG
+			clear_color[0] = 1.f;
+		}
+		int nrects;
+		pixman_box32_t *rects = pixman_region32_rectangles(damage, &nrects);
+		for (int i = 0; i < nrects; ++i) {
+			scissor_output(wlr_output, &rects[i]);
+			wlr_renderer_clear(renderer, clear_color);
+		}
+
+		if (server.session_lock.lock != NULL) {
+			struct render_data data = {
+				.damage = damage,
+				.alpha = 1.0f,
+			};
+
+			struct wlr_session_lock_surface_v1 *lock_surface;
+			wl_list_for_each(lock_surface, &server.session_lock.lock->surfaces, link) {
+				if (lock_surface->output != wlr_output) {
+					continue;
+				}
+				if (!lock_surface->mapped) {
+					continue;
+				}
+
+				output_surface_for_each_surface(output, lock_surface->surface,
+					0.0, 0.0, render_surface_iterator, &data);
+			}
+		}
+		goto renderer_end;
+	}
+
 	if (output_has_opaque_overlay_layer_surface(output)) {
 		goto render_overlay;
 	}

sway/input/input-manager.c

@@ -289,6 +289,10 @@ static void handle_inhibit_deactivate(struct wl_listener *listener, void *data)
 	struct sway_input_manager *input_manager = wl_container_of(
 			listener, input_manager, inhibit_deactivate);
 	struct sway_seat *seat;
+	if (server.session_lock.locked) {
+		// Don't deactivate the grab of a screenlocker
+		return;
+	}
 	wl_list_for_each(seat, &input_manager->seats, link) {
 		seat_set_exclusive_client(seat, NULL);
 		struct sway_node *previous = seat_get_focus(seat);

sway/input/keyboard.c

@@ -409,7 +409,8 @@ static void handle_key_event(struct sway_keyboard *keyboard,
 	char *device_identifier = input_device_get_identifier(wlr_device);
 	bool exact_identifier = wlr_device->keyboard->group != NULL;
 	seat_idle_notify_activity(seat, IDLE_SOURCE_KEYBOARD);
-	bool input_inhibited = seat->exclusive_client != NULL;
+	bool input_inhibited = seat->exclusive_client != NULL ||
+		server.session_lock.locked;
 	struct sway_keyboard_shortcuts_inhibitor *sway_inhibitor =
 		keyboard_shortcuts_inhibitor_get_for_focused_surface(seat);
 	bool shortcuts_inhibited = sway_inhibitor && sway_inhibitor->inhibitor->active;

sway/input/seat.c

@@ -212,6 +212,15 @@ static void seat_send_focus(struct sway_node *node, struct sway_seat *seat) {
 	}
 }
 
+void sway_force_focus(struct wlr_surface *surface) {
+	struct sway_seat *seat;
+	wl_list_for_each(seat, &server.input->seats, link) {
+		seat_keyboard_notify_enter(seat, surface);
+		seat_tablet_pads_notify_enter(seat, surface);
+		sway_input_method_relay_set_focus(&seat->im_relay, surface);
+	}
+}
+
 void seat_for_each_node(struct sway_seat *seat,
 		void (*f)(struct sway_node *node, void *data), void *data) {
 	struct sway_seat_node *current = NULL;
@@ -814,11 +823,13 @@ static void seat_configure_keyboard(struct sway_seat *seat,
 	sway_keyboard_configure(seat_device->keyboard);
 	wlr_seat_set_keyboard(seat->wlr_seat,
 			seat_device->input_device->wlr_device->keyboard);
-	struct sway_node *focus = seat_get_focus(seat);
-	if (focus && node_is_view(focus)) {
-		// force notify reenter to pick up the new configuration
+
+	// force notify reenter to pick up the new configuration.  This reuses
+	// the current focused surface to avoid breaking input grabs.
+	struct wlr_surface *surface = seat->wlr_seat->keyboard_state.focused_surface;
+	if (surface) {
 		wlr_seat_keyboard_notify_clear_focus(seat->wlr_seat);
-		seat_keyboard_notify_enter(seat, focus->sway_container->view->surface);
+		seat_keyboard_notify_enter(seat, surface);
 	}
 }
 
@@ -1070,7 +1081,8 @@ void seat_configure_xcursor(struct sway_seat *seat) {
 bool seat_is_input_allowed(struct sway_seat *seat,
 		struct wlr_surface *surface) {
 	struct wl_client *client = wl_resource_get_client(surface->resource);
-	return !seat->exclusive_client || seat->exclusive_client == client;
+	return seat->exclusive_client == client ||
+		(seat->exclusive_client == NULL && !server.session_lock.locked);
 }
 
 static void send_unfocus(struct sway_container *con, void *data) {
@@ -1171,6 +1183,11 @@ void seat_set_focus(struct sway_seat *seat, struct sway_node *node) {
 		return;
 	}
 
+	// Deny setting focus when an input grab or lockscreen is active
+	if (container && !seat_is_input_allowed(seat, container->view->surface)) {
+		return;
+	}
+
 	struct sway_output *new_output =
 		new_workspace ? new_workspace->output : NULL;
 

sway/input/switch.c

@@ -34,7 +34,8 @@ static bool sway_switch_trigger_test(enum sway_switch_trigger trigger,
 
 static void execute_binding(struct sway_switch *sway_switch) {
 	struct sway_seat* seat = sway_switch->seat_device->sway_seat;
-	bool input_inhibited = seat->exclusive_client != NULL;
+	bool input_inhibited = seat->exclusive_client != NULL ||
+		server.session_lock.locked;
 
 	list_t *bindings = config->current_mode->switch_bindings;
 	struct sway_switch_binding *matched_binding = NULL;

sway/lock.c

@@ -0,0 +1,184 @@
+#define _POSIX_C_SOURCE 200809L
+#include <assert.h>
+#include "log.h"
+#include "sway/input/keyboard.h"
+#include "sway/input/seat.h"
+#include "sway/output.h"
+#include "sway/server.h"
+
+struct sway_session_lock_surface {
+	struct wlr_session_lock_surface_v1 *lock_surface;
+	struct sway_output *output;
+	struct wlr_surface *surface;
+	struct wl_listener map;
+	struct wl_listener destroy;
+	struct wl_listener surface_commit;
+	struct wl_listener output_mode;
+	struct wl_listener output_commit;
+};
+
+static void handle_surface_map(struct wl_listener *listener, void *data) {
+	struct sway_session_lock_surface *surf = wl_container_of(listener, surf, map);
+	sway_force_focus(surf->surface);
+	output_damage_whole(surf->output);
+}
+
+static void handle_surface_commit(struct wl_listener *listener, void *data) {
+	struct sway_session_lock_surface *surf = wl_container_of(listener, surf, surface_commit);
+	output_damage_surface(surf->output, 0, 0, surf->surface, false);
+}
+
+static void handle_output_mode(struct wl_listener *listener, void *data) {
+	struct sway_session_lock_surface *surf = wl_container_of(listener, surf, output_mode);
+	wlr_session_lock_surface_v1_configure(surf->lock_surface,
+		surf->output->width, surf->output->height);
+}
+
+static void handle_output_commit(struct wl_listener *listener, void *data) {
+	struct wlr_output_event_commit *event = data;
+	struct sway_session_lock_surface *surf = wl_container_of(listener, surf, output_commit);
+	if (event->committed & (
+			WLR_OUTPUT_STATE_MODE |
+			WLR_OUTPUT_STATE_SCALE |
+			WLR_OUTPUT_STATE_TRANSFORM)) {
+		wlr_session_lock_surface_v1_configure(surf->lock_surface,
+			surf->output->width, surf->output->height);
+	}
+}
+
+static void handle_surface_destroy(struct wl_listener *listener, void *data) {
+	struct sway_session_lock_surface *surf = wl_container_of(listener, surf, destroy);
+	wl_list_remove(&surf->map.link);
+	wl_list_remove(&surf->destroy.link);
+	wl_list_remove(&surf->surface_commit.link);
+	wl_list_remove(&surf->output_mode.link);
+	wl_list_remove(&surf->output_commit.link);
+	output_damage_whole(surf->output);
+	free(surf);
+}
+
+static void handle_new_surface(struct wl_listener *listener, void *data) {
+	struct wlr_session_lock_surface_v1 *lock_surface = data;
+	struct sway_session_lock_surface *surf = calloc(1, sizeof(*surf));
+	if (surf == NULL) {
+		return;
+	}
+
+	sway_log(SWAY_DEBUG, "new lock layer surface");
+
+	struct sway_output *output = lock_surface->output->data;
+	wlr_session_lock_surface_v1_configure(lock_surface, output->width, output->height);
+
+	surf->lock_surface = lock_surface;
+	surf->surface = lock_surface->surface;
+	surf->output = output;
+	surf->map.notify = handle_surface_map;
+	wl_signal_add(&lock_surface->events.map, &surf->map);
+	surf->destroy.notify = handle_surface_destroy;
+	wl_signal_add(&lock_surface->events.destroy, &surf->destroy);
+	surf->surface_commit.notify = handle_surface_commit;
+	wl_signal_add(&surf->surface->events.commit, &surf->surface_commit);
+	surf->output_mode.notify = handle_output_mode;
+	wl_signal_add(&output->wlr_output->events.mode, &surf->output_mode);
+	surf->output_commit.notify = handle_output_commit;
+	wl_signal_add(&output->wlr_output->events.commit, &surf->output_commit);
+}
+
+static void handle_unlock(struct wl_listener *listener, void *data) {
+	sway_log(SWAY_DEBUG, "session unlocked");
+	server.session_lock.locked = false;
+	server.session_lock.lock = NULL;
+
+	wl_list_remove(&server.session_lock.lock_new_surface.link);
+	wl_list_remove(&server.session_lock.lock_unlock.link);
+	wl_list_remove(&server.session_lock.lock_destroy.link);
+
+	struct sway_seat *seat;
+	wl_list_for_each(seat, &server.input->seats, link) {
+		seat_set_exclusive_client(seat, NULL);
+		// copied from seat_set_focus_layer -- deduplicate?
+		struct sway_node *previous = seat_get_focus_inactive(seat, &root->node);
+		if (previous) {
+			// Hack to get seat to re-focus the return value of get_focus
+			seat_set_focus(seat, NULL);
+			seat_set_focus(seat, previous);
+		}
+	}
+
+	// redraw everything
+	for (int i = 0; i < root->outputs->length; ++i) {
+		struct sway_output *output = root->outputs->items[i];
+		output_damage_whole(output);
+	}
+}
+
+static void handle_abandon(struct wl_listener *listener, void *data) {
+	sway_log(SWAY_INFO, "session lock abandoned");
+	server.session_lock.lock = NULL;
+
+	wl_list_remove(&server.session_lock.lock_new_surface.link);
+	wl_list_remove(&server.session_lock.lock_unlock.link);
+	wl_list_remove(&server.session_lock.lock_destroy.link);
+
+	struct sway_seat *seat;
+	wl_list_for_each(seat, &server.input->seats, link) {
+		seat->exclusive_client = NULL;
+	}
+
+	// redraw everything
+	for (int i = 0; i < root->outputs->length; ++i) {
+		struct sway_output *output = root->outputs->items[i];
+		output_damage_whole(output);
+	}
+}
+
+static void handle_session_lock(struct wl_listener *listener, void *data) {
+	struct wlr_session_lock_v1 *lock = data;
+	struct wl_client *client = wl_resource_get_client(lock->resource);
+
+	if (server.session_lock.lock) {
+		wlr_session_lock_v1_destroy(lock);
+		return;
+	}
+
+	sway_log(SWAY_DEBUG, "session locked");
+	server.session_lock.locked = true;
+	server.session_lock.lock = lock;
+
+	struct sway_seat *seat;
+	wl_list_for_each(seat, &server.input->seats, link) {
+		seat_set_exclusive_client(seat, client);
+	}
+
+	wl_signal_add(&lock->events.new_surface, &server.session_lock.lock_new_surface);
+	wl_signal_add(&lock->events.unlock, &server.session_lock.lock_unlock);
+	wl_signal_add(&lock->events.destroy, &server.session_lock.lock_destroy);
+
+	wlr_session_lock_v1_send_locked(lock);
+
+	// redraw everything
+	for (int i = 0; i < root->outputs->length; ++i) {
+		struct sway_output *output = root->outputs->items[i];
+		output_damage_whole(output);
+	}
+}
+
+static void handle_session_lock_destroy(struct wl_listener *listener, void *data) {
+	assert(server.session_lock.lock == NULL);
+	wl_list_remove(&server.session_lock.new_lock.link);
+	wl_list_remove(&server.session_lock.manager_destroy.link);
+}
+
+void sway_session_lock_init(void) {
+	server.session_lock.manager = wlr_session_lock_manager_v1_create(server.wl_display);
+
+	server.session_lock.lock_new_surface.notify = handle_new_surface;
+	server.session_lock.lock_unlock.notify = handle_unlock;
+	server.session_lock.lock_destroy.notify = handle_abandon;
+	server.session_lock.new_lock.notify = handle_session_lock;
+	server.session_lock.manager_destroy.notify = handle_session_lock_destroy;
+	wl_signal_add(&server.session_lock.manager->events.new_lock,
+		&server.session_lock.new_lock);
+	wl_signal_add(&server.session_lock.manager->events.destroy,
+		&server.session_lock.manager_destroy);
+}

sway/meson.build

@@ -5,6 +5,7 @@ sway_sources = files(
 	'decoration.c',
 	'ipc-json.c',
 	'ipc-server.c',
+	'lock.c',
 	'main.c',
 	'server.c',
 	'swaynag.c',

sway/server.c

@@ -183,6 +183,8 @@ bool server_init(struct sway_server *server) {
 	server->foreign_toplevel_manager =
 		wlr_foreign_toplevel_manager_v1_create(server->wl_display);
 
+	sway_session_lock_init();
+
 	server->drm_lease_manager=
 		wlr_drm_lease_v1_manager_create(server->wl_display, server->backend);
 	if (server->drm_lease_manager) {