Merge branch 'pointer-warp' into 'master'

Draft: seat/pointer: add wl_pointer.warp event support

See merge request wlroots/wlroots!5237

backend/wayland/pointer.c

@@ -211,6 +211,22 @@ static void pointer_handle_axis_relative_direction(void *data,
 	pointer->axis_relative_direction = direction;
 }
 
+static void pointer_handle_warp(void *data, struct wl_pointer *wl_pointer,
+		wl_fixed_t sx, wl_fixed_t sy) {
+	struct wlr_wl_seat *seat = data;
+	struct wlr_wl_pointer *pointer = seat->active_pointer;
+	if (pointer == NULL) {
+		return;
+	}
+
+	struct wlr_pointer_warp_event event = {
+		.pointer = &pointer->wlr_pointer,
+		.sx = wl_fixed_to_double(sx),
+		.sy = wl_fixed_to_double(sy),
+	};
+	wl_signal_emit_mutable(&pointer->wlr_pointer.events.warp, &event);
+}
+
 static const struct wl_pointer_listener pointer_listener = {
 	.enter = pointer_handle_enter,
 	.leave = pointer_handle_leave,
@@ -223,6 +239,7 @@ static const struct wl_pointer_listener pointer_listener = {
 	.axis_discrete = pointer_handle_axis_discrete,
 	.axis_value120 = pointer_handle_axis_value120,
 	.axis_relative_direction = pointer_handle_axis_relative_direction,
+	.warp = pointer_handle_warp,
 };
 
 static void gesture_swipe_begin(void *data,

include/wlr/types/wlr_pointer.h

@@ -34,6 +34,7 @@ struct wlr_pointer {
 		struct wl_signal button; // struct wlr_pointer_button_event
 		struct wl_signal axis; // struct wlr_pointer_axis_event
 		struct wl_signal frame;
+		struct wl_signal warp; // struct wlr_pointer_warp_event
 
 		struct wl_signal swipe_begin; // struct wlr_pointer_swipe_begin_event
 		struct wl_signal swipe_update; // struct wlr_pointer_swipe_update_event
@@ -82,7 +83,10 @@ struct wlr_pointer_axis_event {
 	double delta;
 	int32_t delta_discrete;
 };
-
+struct wlr_pointer_warp_event {
+	struct wlr_pointer *pointer;
+	double sx, sy;
+};
 struct wlr_pointer_swipe_begin_event {
 	struct wlr_pointer *pointer;
 	uint32_t time_msec;

include/wlr/types/wlr_seat.h

@@ -432,6 +432,15 @@ void wlr_seat_pointer_send_axis(struct wlr_seat *wlr_seat, uint32_t time_msec,
  */
 void wlr_seat_pointer_send_frame(struct wlr_seat *wlr_seat);
 
+/**
+ * Send a warp event to the surface with pointer focus. This notifies the client
+ * that the pointer location has changed due to surface movement or compositor
+ * action, rather than input device motion. Coordinates are surface-local.
+ * This function does not respect pointer grabs.
+ */
+void wlr_seat_pointer_send_warp(struct wlr_seat *wlr_seat,
+		double sx, double sy);
+
 /**
  * Notify the seat of a pointer enter event to the given surface and request it
  * to be the focused surface for the pointer. Pass surface-local coordinates

types/seat/wlr_seat.c

@@ -11,7 +11,7 @@
 #include "types/wlr_seat.h"
 #include "util/global.h"
 
-#define SEAT_VERSION 9
+#define SEAT_VERSION 11
 
 static void seat_handle_get_pointer(struct wl_client *client,
 		struct wl_resource *seat_resource, uint32_t id) {

types/seat/wlr_seat_pointer.c

@@ -410,6 +410,28 @@ void wlr_seat_pointer_send_frame(struct wlr_seat *wlr_seat) {
 	}
 }
 
+void wlr_seat_pointer_send_warp(struct wlr_seat *wlr_seat,
+		double sx, double sy) {
+	struct wlr_seat_client *client = wlr_seat->pointer_state.focused_client;
+	if (client == NULL) {
+		return;
+	}
+
+	struct wl_resource *resource;
+	wl_resource_for_each(resource, &client->pointers) {
+		if (wlr_seat_client_from_pointer_resource(resource) == NULL) {
+			continue;
+		}
+
+		uint32_t version = wl_resource_get_version(resource);
+		if (version >= 11) { // WL_POINTER_WARP_SINCE_VERSION
+			wl_pointer_send_warp(resource,
+				wl_fixed_from_double(sx),
+				wl_fixed_from_double(sy));
+		}
+	}
+}
+
 void wlr_seat_pointer_start_grab(struct wlr_seat *wlr_seat,
 		struct wlr_seat_pointer_grab *grab) {
 	assert(wlr_seat);