sway/input/cursor: implement pointer-warp-v1

Ref: https://gitlab.freedesktop.org/wlroots/wlroots/-/merge_requests/5367

Author: llyyr

include/sway/input/cursor.h

@@ -147,4 +147,5 @@ const char *get_mouse_button_name(uint32_t button);
 
 void handle_request_set_cursor_shape(struct wl_listener *listener, void *data);
 
+void handle_pointer_warp(struct wl_listener *listener, void *data);
 #endif

include/sway/server.h

@@ -81,6 +81,9 @@ struct sway_server {
 	struct wlr_pointer_constraints_v1 *pointer_constraints;
 	struct wl_listener pointer_constraint;
 
+	struct wlr_pointer_warp_v1 *pointer_warp_v1;
+	struct wl_listener pointer_warp;
+
 	struct wlr_xdg_output_manager_v1 *xdg_output_manager_v1;
 
 	struct wlr_output_manager_v1 *output_manager_v1;

sway/input/cursor.c

@@ -9,6 +9,7 @@
 #include <wlr/types/wlr_cursor_shape_v1.h>
 #include <wlr/types/wlr_pointer.h>
 #include <wlr/types/wlr_relative_pointer_v1.h>
+#include <wlr/types/wlr_pointer_warp_v1.h>
 #include <wlr/types/wlr_touch.h>
 #include <wlr/types/wlr_tablet_v2.h>
 #include <wlr/types/wlr_tablet_pad.h>
@@ -1415,3 +1416,43 @@ void handle_request_set_cursor_shape(struct wl_listener *listener, void *data) {
 
 	cursor_set_image(seat->cursor, wlr_cursor_shape_v1_name(event->shape), focused_client);
 }
+
+void handle_pointer_warp(struct wl_listener *listener, void *data) {
+	const struct wlr_pointer_warp_v1_event_warp *event = data;
+	struct sway_seat *seat = event->seat_client->seat->data;
+	struct sway_cursor *cursor = seat->cursor;
+
+	struct wl_client *focused_client = NULL;
+	struct wlr_surface *focused_surface =
+		seat->wlr_seat->pointer_state.focused_surface;
+	if (focused_surface != NULL) {
+		focused_client = wl_resource_get_client(focused_surface->resource);
+	}
+
+	if (focused_client == NULL || event->seat_client->client != focused_client) {
+		sway_log(SWAY_DEBUG, "denying request to warp cursor from unfocused client");
+		return;
+	}
+
+	struct wlr_box surface_box = {
+		.width = event->surface->current.width,
+		.height = event->surface->current.height,
+	};
+
+	if (!wlr_box_contains_point(&surface_box, event->x, event->y)) {
+		sway_log(SWAY_DEBUG, "denying request to warp cursor out of surface");
+		return;
+	}
+
+	struct sway_view *view = view_from_wlr_surface(event->surface);
+	if (view == NULL) {
+		sway_log(SWAY_DEBUG, "unsupported surface for cursor warp");
+		return;
+	}
+
+	struct sway_container *con = view->container;
+	double lx = event->x + con->pending.content_x - view->geometry.x;
+	double ly = event->y + con->pending.content_y - view->geometry.y;
+	wlr_cursor_warp(cursor->cursor, NULL, lx, ly);
+	cursor_rebase(cursor);
+}

sway/server.c

@@ -33,6 +33,7 @@
 #include <wlr/types/wlr_output_management_v1.h>
 #include <wlr/types/wlr_output_power_management_v1.h>
 #include <wlr/types/wlr_pointer_constraints_v1.h>
+#include <wlr/types/wlr_pointer_warp_v1.h>
 #include <wlr/types/wlr_presentation_time.h>
 #include <wlr/types/wlr_primary_selection_v1.h>
 #include <wlr/types/wlr_relative_pointer_v1.h>
@@ -79,6 +80,7 @@
 #define SWAY_FOREIGN_TOPLEVEL_LIST_VERSION 1
 #define SWAY_PRESENTATION_VERSION 2
 #define SWAY_XDG_DECORATION_VERSION 2
+#define SWAY_POINTER_WARP_VERSION 1
 
 bool unsupported_gpu_detected = false;
 
@@ -426,6 +428,14 @@ bool server_init(struct sway_server *server) {
 	wl_signal_add(&server->pointer_constraints->events.new_constraint,
 		&server->pointer_constraint);
 
+	server->pointer_warp_v1 = wlr_pointer_warp_v1_create(server->wl_display, SWAY_POINTER_WARP_VERSION);
+	if (!server->pointer_warp_v1) {
+		sway_log(SWAY_ERROR, "Failed to create pointer warp");
+		return false;
+	}
+	server->pointer_warp.notify = handle_pointer_warp;
+	wl_signal_add(&server->pointer_warp_v1->events.warp, &server->pointer_warp);
+
 	if (!wlr_presentation_create(server->wl_display, server->backend, SWAY_PRESENTATION_VERSION)) {
 		sway_log(SWAY_ERROR, "Failed to create presentation");
 		return false;
@@ -724,6 +734,7 @@ void server_fini(struct sway_server *server) {
 	wl_list_remove(&server->server_decoration.link);
 	wl_list_remove(&server->xdg_decoration.link);
 	wl_list_remove(&server->pointer_constraint.link);
+	wl_list_remove(&server->pointer_warp.link);
 	wl_list_remove(&server->output_manager_apply.link);
 	wl_list_remove(&server->output_manager_test.link);
 	wl_list_remove(&server->output_power_manager_set_mode.link);