xwayland: Introduce a private struct for XWayland interface

libweston-desktop implements this private struct.

Signed-off-by: Quentin Glidic <sardemff7+git@sardemff7.net>
Reviewed-by: Jonas Ådahl <jadahl@gmail.com>
Acked-by: Giulio Camuffo <giulio.camuffo@kdab.com>

Differential Revision: https://phabricator.freedesktop.org/D1208

Makefile.am

@@ -1028,6 +1028,7 @@ xwayland_la_CFLAGS =				\
 	$(CAIRO_CFLAGS)
 xwayland_la_SOURCES =				\
 	xwayland/xwayland.h			\
+	xwayland/xwayland-internal-interface.h	\
 	xwayland/window-manager.c		\
 	xwayland/selection.c			\
 	xwayland/dnd.c				\

libweston-desktop/xwayland.c

@@ -35,6 +35,7 @@
 
 #include "libweston-desktop.h"
 #include "internal.h"
+#include "xwayland/xwayland-internal-interface.h"
 
 enum weston_desktop_xwayland_surface_state {
 	NONE,
@@ -51,13 +52,13 @@ struct weston_desktop_xwayland {
 	struct weston_layer layer;
 };
 
-struct shell_surface {
+struct weston_desktop_xwayland_surface {
 	struct weston_desktop_xwayland *xwayland;
 	struct weston_desktop *desktop;
 	struct weston_desktop_surface *surface;
 	struct wl_listener resource_destroy_listener;
 	struct weston_view *view;
-	const struct weston_shell_client *client;
+	const struct weston_xwayland_client_interface *client_interface;
 	struct weston_geometry next_geometry;
 	bool has_next_geometry;
 	bool added;
@@ -65,7 +66,7 @@ struct shell_surface {
 };
 
 static void
-weston_desktop_xwayland_surface_change_state(struct shell_surface *surface,
+weston_desktop_xwayland_surface_change_state(struct weston_desktop_xwayland_surface *surface,
 					     enum weston_desktop_xwayland_surface_state state,
 					     struct weston_desktop_surface *parent,
 					     int32_t x, int32_t y)
@@ -114,7 +115,7 @@ weston_desktop_xwayland_surface_committed(struct weston_desktop_surface *dsurfac
 					  void *user_data, bool new_buffer,
 					  int32_t sx, int32_t sy)
 {
-	struct shell_surface *surface = user_data;
+	struct weston_desktop_xwayland_surface *surface = user_data;
 
 	if (surface->has_next_geometry) {
 		surface->has_next_geometry = false;
@@ -132,17 +133,18 @@ weston_desktop_xwayland_surface_set_size(struct weston_desktop_surface *dsurface
 					 void *user_data,
 					 int32_t width, int32_t height)
 {
-	struct shell_surface *surface = user_data;
+	struct weston_desktop_xwayland_surface *surface = user_data;
+	struct weston_surface *wsurface =
+		weston_desktop_surface_get_surface(surface->surface);
 
-	surface->client->send_configure(weston_desktop_surface_get_surface(surface->surface),
-				       width, height);
+	surface->client_interface->send_configure(wsurface, width, height);
 }
 
 static void
 weston_desktop_xwayland_surface_destroy(struct weston_desktop_surface *dsurface,
 					void *user_data)
 {
-	struct shell_surface *surface = user_data;
+	struct weston_desktop_xwayland_surface *surface = user_data;
 
 	wl_list_remove(&surface->resource_destroy_listener.link);
 
@@ -160,7 +162,7 @@ static bool
 weston_desktop_xwayland_surface_get_maximized(struct weston_desktop_surface *dsurface,
 					      void *user_data)
 {
-	struct shell_surface *surface = user_data;
+	struct weston_desktop_xwayland_surface *surface = user_data;
 
 	return surface->state == MAXIMIZED;
 }
@@ -169,7 +171,7 @@ static bool
 weston_desktop_xwayland_surface_get_fullscreen(struct weston_desktop_surface *dsurface,
 					       void *user_data)
 {
-	struct shell_surface *surface = user_data;
+	struct weston_desktop_xwayland_surface *surface = user_data;
 
 	return surface->state == FULLSCREEN;
 }
@@ -188,27 +190,26 @@ static void
 weston_destop_xwayland_resource_destroyed(struct wl_listener *listener,
 					  void *data)
 {
-	struct shell_surface *surface =
+	struct weston_desktop_xwayland_surface *surface =
 		wl_container_of(listener, surface, resource_destroy_listener);
 
 	weston_desktop_surface_destroy(surface->surface);
 }
 
-static struct shell_surface *
-create_shell_surface(void *shell,
+static struct weston_desktop_xwayland_surface *
+create_surface(struct weston_desktop_xwayland *xwayland,
 	       struct weston_surface *wsurface,
-		     const struct weston_shell_client *client)
+	       const struct weston_xwayland_client_interface *client_interface)
 {
-	struct weston_desktop_xwayland *xwayland = shell;
-	struct shell_surface *surface;
+	struct weston_desktop_xwayland_surface *surface;
 
-	surface = zalloc(sizeof(struct shell_surface));
+	surface = zalloc(sizeof(struct weston_desktop_xwayland_surface));
 	if (surface == NULL)
 		return NULL;
 
 	surface->xwayland = xwayland;
 	surface->desktop = xwayland->desktop;
-	surface->client = client;
+	surface->client_interface = client_interface;
 
 	surface->surface =
 		weston_desktop_surface_create(surface->desktop,
@@ -229,15 +230,15 @@ create_shell_surface(void *shell,
 }
 
 static void
-set_toplevel(struct shell_surface *surface)
+set_toplevel(struct weston_desktop_xwayland_surface *surface)
 {
 	weston_desktop_xwayland_surface_change_state(surface, TOPLEVEL, NULL,
 						     0, 0);
 }
 
 static void
-set_transient(struct shell_surface *surface,
-	      struct weston_surface *wparent, int x, int y, uint32_t flags)
+set_parent(struct weston_desktop_xwayland_surface *surface,
+	   struct weston_surface *wparent)
 {
 	struct weston_desktop_surface *parent;
 
@@ -245,20 +246,26 @@ set_transient(struct shell_surface *surface,
 		return;
 
 	parent = weston_surface_get_desktop_surface(wparent);
-	if (flags & WL_SHELL_SURFACE_TRANSIENT_INACTIVE) {
-		weston_desktop_xwayland_surface_change_state(surface, TRANSIENT,
-							     parent, x, y);
-	} else {
-		weston_desktop_xwayland_surface_change_state(surface, TOPLEVEL,
-							     NULL, 0, 0);
-		weston_desktop_api_set_parent(surface->desktop,
-					      surface->surface, parent);
+	weston_desktop_api_set_parent(surface->desktop, surface->surface, parent);
 }
+
+static void
+set_transient(struct weston_desktop_xwayland_surface *surface,
+	      struct weston_surface *wparent, int x, int y)
+{
+	struct weston_desktop_surface *parent;
+
+	if (!weston_surface_is_desktop_surface(wparent))
+		return;
+
+	parent = weston_surface_get_desktop_surface(wparent);
+	weston_desktop_xwayland_surface_change_state(surface, TRANSIENT, parent,
+						     x, y);
 }
 
 static void
-set_fullscreen(struct shell_surface *surface, uint32_t method,
-	       uint32_t framerate, struct weston_output *output)
+set_fullscreen(struct weston_desktop_xwayland_surface *surface,
+	       struct weston_output *output)
 {
 	weston_desktop_xwayland_surface_change_state(surface, FULLSCREEN, NULL,
 						     0, 0);
@@ -267,15 +274,14 @@ set_fullscreen(struct shell_surface *surface, uint32_t method,
 }
 
 static void
-set_xwayland(struct shell_surface *surface, int x, int y,
-	     uint32_t flags)
+set_xwayland(struct weston_desktop_xwayland_surface *surface, int x, int y)
 {
 	weston_desktop_xwayland_surface_change_state(surface, XWAYLAND, NULL,
 						     x, y);
 }
 
 static int
-move(struct shell_surface *surface,
+move(struct weston_desktop_xwayland_surface *surface,
      struct weston_pointer *pointer)
 {
 	if (surface->state == TOPLEVEL ||
@@ -287,7 +293,7 @@ move(struct shell_surface *surface,
 }
 
 static int
-resize(struct shell_surface *surface,
+resize(struct weston_desktop_xwayland_surface *surface,
        struct weston_pointer *pointer, uint32_t edges)
 {
 	if (surface->state == TOPLEVEL ||
@@ -300,13 +306,13 @@ resize(struct shell_surface *surface,
 }
 
 static void
-set_title(struct shell_surface *surface, const char *title)
+set_title(struct weston_desktop_xwayland_surface *surface, const char *title)
 {
 	weston_desktop_surface_set_title(surface->surface, title);
 }
 
 static void
-set_window_geometry(struct shell_surface *surface,
+set_window_geometry(struct weston_desktop_xwayland_surface *surface,
 		    int32_t x, int32_t y, int32_t width, int32_t height)
 {
 	surface->has_next_geometry = true;
@@ -317,7 +323,7 @@ set_window_geometry(struct shell_surface *surface,
 }
 
 static void
-set_maximized(struct shell_surface *surface)
+set_maximized(struct weston_desktop_xwayland_surface *surface)
 {
 	weston_desktop_xwayland_surface_change_state(surface, MAXIMIZED, NULL,
 						     0, 0);
@@ -326,10 +332,26 @@ set_maximized(struct shell_surface *surface)
 }
 
 static void
-set_pid(struct shell_surface *surface, pid_t pid)
+set_pid(struct weston_desktop_xwayland_surface *surface, pid_t pid)
 {
+	weston_desktop_surface_set_pid(surface->surface, pid);
 }
 
+static const struct weston_desktop_xwayland_interface weston_desktop_xwayland_interface = {
+	.create_surface = create_surface,
+	.set_toplevel = set_toplevel,
+	.set_parent = set_parent,
+	.set_transient = set_transient,
+	.set_fullscreen = set_fullscreen,
+	.set_xwayland = set_xwayland,
+	.move = move,
+	.resize = resize,
+	.set_title = set_title,
+	.set_window_geometry = set_window_geometry,
+	.set_maximized = set_maximized,
+	.set_pid = set_pid,
+};
+
 void
 weston_desktop_xwayland_init(struct weston_desktop *desktop)
 {
@@ -345,16 +367,6 @@ weston_desktop_xwayland_init(struct weston_desktop *desktop)
 
 	weston_layer_init(&xwayland->layer, &compositor->cursor_layer.link);
 
-	compositor->shell_interface.shell = xwayland;
-	compositor->shell_interface.create_shell_surface = create_shell_surface;
-	compositor->shell_interface.set_toplevel = set_toplevel;
-	compositor->shell_interface.set_transient = set_transient;
-	compositor->shell_interface.set_fullscreen = set_fullscreen;
-	compositor->shell_interface.set_xwayland = set_xwayland;
-	compositor->shell_interface.move = move;
-	compositor->shell_interface.resize = resize;
-	compositor->shell_interface.set_title = set_title;
-	compositor->shell_interface.set_window_geometry = set_window_geometry;
-	compositor->shell_interface.set_maximized = set_maximized;
-	compositor->shell_interface.set_pid = set_pid;
+	compositor->xwayland = xwayland;
+	compositor->xwayland_interface = &weston_desktop_xwayland_interface;
 }

libweston/compositor.h

@@ -778,10 +778,15 @@ struct weston_backend {
 	void (*restore)(struct weston_compositor *compositor);
 };
 
+struct weston_desktop_xwayland;
+struct weston_desktop_xwayland_interface;
+
 struct weston_compositor {
 	struct wl_signal destroy_signal;
 
 	struct wl_display *wl_display;
+	struct weston_desktop_xwayland *xwayland;
+	const struct weston_desktop_xwayland_interface *xwayland_interface;
 	struct weston_shell_interface shell_interface;
 
 	/* surface signals */

xwayland/launcher.c

@@ -341,6 +341,7 @@ const struct weston_xwayland_api api = {
 	weston_xwayland_xserver_loaded,
 	weston_xwayland_xserver_exited,
 };
+extern const struct weston_xwayland_surface_api surface_api;
 
 WL_EXPORT int
 module_init(struct weston_compositor *compositor,
@@ -357,6 +358,13 @@ module_init(struct weston_compositor *compositor,
 	wxs->wl_display = display;
 	wxs->compositor = compositor;
 
+	if (weston_xwayland_get_api(compositor) != NULL ||
+	    weston_xwayland_surface_get_api(compositor) != NULL) {
+		weston_log("The xwayland module APIs are already loaded.\n");
+		free(wxs);
+		return -1;
+	}
+
 	ret = weston_plugin_api_register(compositor, WESTON_XWAYLAND_API_NAME,
 					 &api, sizeof(api));
 	if (ret < 0) {
@@ -365,6 +373,15 @@ module_init(struct weston_compositor *compositor,
 		return -1;
 	}
 
+	ret = weston_plugin_api_register(compositor,
+					 WESTON_XWAYLAND_SURFACE_API_NAME,
+					 &surface_api, sizeof(surface_api));
+	if (ret < 0) {
+		weston_log("Failed to register the xwayland surface API.\n");
+		free(wxs);
+		return -1;
+	}
+
 	wxs->destroy_listener.notify = weston_xserver_destroy;
 	wl_signal_add(&compositor->destroy_signal, &wxs->destroy_listener);
 

xwayland/window-manager.c

@@ -39,6 +39,7 @@
 #include <linux/input.h>
 
 #include "xwayland.h"
+#include "xwayland-internal-interface.h"
 
 #include "cairo-util.h"
 #include "compositor.h"
@@ -132,7 +133,7 @@ struct weston_wm_window {
 	cairo_surface_t *cairo_surface;
 	uint32_t surface_id;
 	struct weston_surface *surface;
-	struct shell_surface *shsurf;
+	struct weston_desktop_xwayland_surface *shsurf;
 	struct wl_listener surface_destroy_listener;
 	struct wl_event_source *repaint_source;
 	struct wl_event_source *configure_source;
@@ -395,8 +396,8 @@ static void
 weston_wm_window_read_properties(struct weston_wm_window *window)
 {
 	struct weston_wm *wm = window->wm;
-	struct weston_shell_interface *shell_interface =
-		&wm->server->compositor->shell_interface;
+	const struct weston_desktop_xwayland_interface *xwayland_interface =
+		wm->server->compositor->xwayland_interface;
 
 #define F(field) offsetof(struct weston_wm_window, field)
 	const struct {
@@ -540,11 +541,11 @@ weston_wm_window_read_properties(struct weston_wm_window *window)
 	}
 
 	if (window->shsurf && window->name)
-		shell_interface->set_title(window->shsurf, window->name);
+		xwayland_interface->set_title(window->shsurf, window->name);
 	if (window->frame && window->name)
 		frame_set_title(window->frame, window->name);
 	if (window->shsurf && window->pid > 0)
-		shell_interface->set_pid(window->shsurf, window->pid);
+		xwayland_interface->set_pid(window->shsurf, window->pid);
 }
 
 static void
@@ -1043,8 +1044,8 @@ weston_wm_window_draw_decoration(void *data)
 	cairo_t *cr;
 	int x, y, width, height;
 	int32_t input_x, input_y, input_w, input_h;
-	struct weston_shell_interface *shell_interface =
-		&wm->server->compositor->shell_interface;
+	const struct weston_desktop_xwayland_interface *xwayland_interface =
+		wm->server->compositor->xwayland_interface;
 	uint32_t flags = 0;
 	struct weston_view *view;
 
@@ -1106,7 +1107,7 @@ weston_wm_window_draw_decoration(void *data)
 		pixman_region32_init_rect(&window->surface->pending.input,
 					  input_x, input_y, input_w, input_h);
 
-		shell_interface->set_window_geometry(window->shsurf,
+		xwayland_interface->set_window_geometry(window->shsurf,
 							input_x, input_y, input_w, input_h);
 	}
 }
@@ -1352,8 +1353,8 @@ weston_wm_window_handle_moveresize(struct weston_wm_window *window,
 	struct weston_seat *seat = weston_wm_pick_seat_for_window(window);
 	struct weston_pointer *pointer = weston_seat_get_pointer(seat);
 	int detail;
-	struct weston_shell_interface *shell_interface =
-		&wm->server->compositor->shell_interface;
+	const struct weston_desktop_xwayland_interface *xwayland_interface =
+		wm->server->compositor->xwayland_interface;
 
 	if (!pointer || pointer->button_count != 1
 	    || !pointer->focus
@@ -1363,7 +1364,7 @@ weston_wm_window_handle_moveresize(struct weston_wm_window *window,
 	detail = client_message->data.data32[2];
 	switch (detail) {
 	case _NET_WM_MOVERESIZE_MOVE:
-		shell_interface->move(window->shsurf, pointer);
+		xwayland_interface->move(window->shsurf, pointer);
 		break;
 	case _NET_WM_MOVERESIZE_SIZE_TOPLEFT:
 	case _NET_WM_MOVERESIZE_SIZE_TOP:
@@ -1373,7 +1374,7 @@ weston_wm_window_handle_moveresize(struct weston_wm_window *window,
 	case _NET_WM_MOVERESIZE_SIZE_BOTTOM:
 	case _NET_WM_MOVERESIZE_SIZE_BOTTOMLEFT:
 	case _NET_WM_MOVERESIZE_SIZE_LEFT:
-		shell_interface->resize(window->shsurf, pointer, map[detail]);
+		xwayland_interface->resize(window->shsurf, pointer, map[detail]);
 		break;
 	case _NET_WM_MOVERESIZE_CANCEL:
 		break;
@@ -1415,10 +1416,10 @@ weston_wm_window_configure(void *data);
 static void
 weston_wm_window_set_toplevel(struct weston_wm_window *window)
 {
-	struct weston_shell_interface *shell_interface =
-		&window->wm->server->compositor->shell_interface;
+	const struct weston_desktop_xwayland_interface *xwayland_interface =
+		window->wm->server->compositor->xwayland_interface;
 
-	shell_interface->set_toplevel(window->shsurf);
+	xwayland_interface->set_toplevel(window->shsurf);
 	window->width = window->saved_width;
 	window->height = window->saved_height;
 	if (window->frame)
@@ -1439,8 +1440,8 @@ weston_wm_window_handle_state(struct weston_wm_window *window,
 			      xcb_client_message_event_t *client_message)
 {
 	struct weston_wm *wm = window->wm;
-	struct weston_shell_interface *shell_interface =
-		&wm->server->compositor->shell_interface;
+	const struct weston_desktop_xwayland_interface *xwayland_interface =
+		wm->server->compositor->xwayland_interface;
 	uint32_t action, property;
 	int maximized = weston_wm_window_is_maximized(window);
 
@@ -1455,9 +1456,8 @@ weston_wm_window_handle_state(struct weston_wm_window *window,
 			window->saved_height = window->height;
 
 			if (window->shsurf)
-				shell_interface->set_fullscreen(window->shsurf,
-								WL_SHELL_SURFACE_FULLSCREEN_METHOD_DEFAULT,
-								0, NULL);
+				xwayland_interface->set_fullscreen(window->shsurf,
+								   NULL);
 		} else {
 			if (window->shsurf)
 				weston_wm_window_set_toplevel(window);
@@ -1476,7 +1476,7 @@ weston_wm_window_handle_state(struct weston_wm_window *window,
 				window->saved_height = window->height;
 
 				if (window->shsurf)
-					shell_interface->set_maximized(window->shsurf);
+					xwayland_interface->set_maximized(window->shsurf);
 			} else if (window->shsurf) {
 				weston_wm_window_set_toplevel(window);
 			}
@@ -1753,8 +1753,8 @@ static void
 weston_wm_handle_button(struct weston_wm *wm, xcb_generic_event_t *event)
 {
 	xcb_button_press_event_t *button = (xcb_button_press_event_t *) event;
-	struct weston_shell_interface *shell_interface =
-		&wm->server->compositor->shell_interface;
+	const struct weston_desktop_xwayland_interface *xwayland_interface =
+		wm->server->compositor->xwayland_interface;
 	struct weston_seat *seat;
 	struct weston_pointer *pointer;
 	struct weston_wm_window *window;
@@ -1794,13 +1794,13 @@ weston_wm_handle_button(struct weston_wm *wm, xcb_generic_event_t *event)
 
 	if (frame_status(window->frame) & FRAME_STATUS_MOVE) {
 		if (pointer)
-			shell_interface->move(window->shsurf, pointer);
+			xwayland_interface->move(window->shsurf, pointer);
 		frame_status_clear(window->frame, FRAME_STATUS_MOVE);
 	}
 
 	if (frame_status(window->frame) & FRAME_STATUS_RESIZE) {
 		if (pointer)
-			shell_interface->resize(window->shsurf, pointer, location);
+			xwayland_interface->resize(window->shsurf, pointer, location);
 		frame_status_clear(window->frame, FRAME_STATUS_RESIZE);
 	}
 
@@ -1815,7 +1815,7 @@ weston_wm_handle_button(struct weston_wm *wm, xcb_generic_event_t *event)
 		if (weston_wm_window_is_maximized(window)) {
 			window->saved_width = window->width;
 			window->saved_height = window->height;
-			shell_interface->set_maximized(window->shsurf);
+			xwayland_interface->set_maximized(window->shsurf);
 		} else {
 			weston_wm_window_set_toplevel(window);
 		}
@@ -2333,6 +2333,12 @@ get_wm_window(struct weston_surface *surface)
 	return NULL;
 }
 
+static bool
+is_wm_window(struct weston_surface *surface)
+{
+	return get_wm_window(surface) != NULL;
+}
+
 static void
 weston_wm_window_configure(void *data)
 {
@@ -2431,9 +2437,8 @@ send_position(struct weston_surface *surface, int32_t x, int32_t y)
 	}
 }
 
-static const struct weston_shell_client shell_client = {
+static const struct weston_xwayland_client_interface shell_client = {
 	send_configure,
-	send_position
 };
 
 static int
@@ -2500,11 +2505,12 @@ xserver_map_shell_surface(struct weston_wm_window *window,
 			  struct weston_surface *surface)
 {
 	struct weston_wm *wm = window->wm;
-	struct weston_shell_interface *shell_interface =
-		&wm->server->compositor->shell_interface;
+	struct weston_desktop_xwayland *xwayland =
+		wm->server->compositor->xwayland;
+	const struct weston_desktop_xwayland_interface *xwayland_interface =
+		wm->server->compositor->xwayland_interface;
 	struct weston_output *output;
 	struct weston_wm_window *parent;
-	int flags = 0;
 
 	weston_wm_window_read_properties(window);
 
@@ -2521,7 +2527,7 @@ xserver_map_shell_surface(struct weston_wm_window *window,
 
 	weston_wm_window_schedule_repaint(window);
 
-	if (!shell_interface->create_shell_surface)
+	if (!xwayland_interface)
 		return;
 
 	if (window->surface->committed) {
@@ -2532,50 +2538,52 @@ xserver_map_shell_surface(struct weston_wm_window *window,
 	}
 
 	window->shsurf =
-		shell_interface->create_shell_surface(shell_interface->shell,
+		xwayland_interface->create_surface(xwayland,
 						   window->surface,
 						   &shell_client);
 
 	if (window->name)
-		shell_interface->set_title(window->shsurf, window->name);
+		xwayland_interface->set_title(window->shsurf, window->name);
 	if (window->pid > 0)
-		shell_interface->set_pid(window->shsurf, window->pid);
+		xwayland_interface->set_pid(window->shsurf, window->pid);
 
 	if (window->fullscreen) {
 		window->saved_width = window->width;
 		window->saved_height = window->height;
-		shell_interface->set_fullscreen(window->shsurf,
-						WL_SHELL_SURFACE_FULLSCREEN_METHOD_DEFAULT,
-						0, NULL);
+		xwayland_interface->set_fullscreen(window->shsurf, NULL);
 		return;
 	} else if (legacy_fullscreen(wm, window, &output)) {
 		window->fullscreen = 1;
-		shell_interface->set_fullscreen(window->shsurf,
-						WL_SHELL_SURFACE_FULLSCREEN_METHOD_DEFAULT,
-						0, output);
+		xwayland_interface->set_fullscreen(window->shsurf, output);
 	} else if (window->override_redirect) {
-		shell_interface->set_xwayland(window->shsurf,
-					      window->x,
-					      window->y,
-					      WL_SHELL_SURFACE_TRANSIENT_INACTIVE);
+		xwayland_interface->set_xwayland(window->shsurf,
+						 window->x, window->y);
 	} else if (window->transient_for && window->transient_for->surface) {
 		parent = window->transient_for;
-		if (weston_wm_window_type_inactive(window))
-			flags = WL_SHELL_SURFACE_TRANSIENT_INACTIVE;
-		shell_interface->set_transient(window->shsurf,
+		if (weston_wm_window_type_inactive(window)) {
+			xwayland_interface->set_transient(window->shsurf,
 							  parent->surface,
 							  window->x - parent->x,
-					       window->y - parent->y, flags);
+							  window->y - parent->y);
+		} else {
+			xwayland_interface->set_toplevel(window->shsurf);
+			xwayland_interface->set_parent(window->shsurf,
+						       parent->surface);
+		}
 	} else if (weston_wm_window_is_maximized(window)) {
-		shell_interface->set_maximized(window->shsurf);
+		xwayland_interface->set_maximized(window->shsurf);
 	} else {
 		if (weston_wm_window_type_inactive(window)) {
-			shell_interface->set_xwayland(window->shsurf,
+			xwayland_interface->set_xwayland(window->shsurf,
 							 window->x,
-							window->y,
-							WL_SHELL_SURFACE_TRANSIENT_INACTIVE);
+							 window->y);
 		} else {
-			shell_interface->set_toplevel(window->shsurf);
+			xwayland_interface->set_toplevel(window->shsurf);
 		}
 	}
 }
+
+const struct weston_xwayland_surface_api surface_api = {
+	is_wm_window,
+	send_position,
+};

xwayland/xwayland-api.h

@@ -38,6 +38,7 @@ struct weston_compositor;
 struct weston_xwayland;
 
 #define WESTON_XWAYLAND_API_NAME "weston_xwayland_v1"
+#define WESTON_XWAYLAND_SURFACE_API_NAME "weston_xwayland_surface_v1"
 
 typedef pid_t
 (*weston_xwayland_spawn_xserver_func_t)(
@@ -127,6 +128,47 @@ weston_xwayland_get_api(struct weston_compositor *compositor)
 	return (const struct weston_xwayland_api *)api;
 }
 
+/** The libweston Xwayland surface API
+ *
+ * This API allows control of the Xwayland libweston module surfaces.
+ * The module must be loaded at runtime with \a weston_compositor_load_xwayland,
+ * after which the API can be retrieved by using
+ * \a weston_xwayland_surface_get_api.
+ */
+struct weston_xwayland_surface_api {
+	/** Check if the surface is an Xwayland surface
+	 *
+	 * \param surface The surface.
+	 */
+	bool
+	(*is_xwayland_surface)(struct weston_surface *surface);
+	/** Notify the Xwayland surface that its position changed.
+	 *
+	 * \param surface The Xwayland surface.
+	 * \param x The x-axis position.
+	 * \param y The y-axis position.
+	 */
+	void
+	(*send_position)(struct weston_surface *surface, int32_t x, int32_t y);
+};
+
+/** Retrieve the API object for the libweston Xwayland surface.
+ *
+ * The module must have been previously loaded by calling
+ * \a weston_compositor_load_xwayland.
+ *
+ * \param compositor The compositor instance.
+ */
+static inline const struct weston_xwayland_surface_api *
+weston_xwayland_surface_get_api(struct weston_compositor *compositor)
+{
+	const void *api;
+	api = weston_plugin_api_get(compositor, WESTON_XWAYLAND_SURFACE_API_NAME,
+				    sizeof(struct weston_xwayland_surface_api));
+	/* The cast is necessary to use this function in C++ code */
+	return (const struct weston_xwayland_surface_api *)api;
+}
+
 #ifdef  __cplusplus
 }
 #endif

xwayland/xwayland-internal-interface.h

@@ -0,0 +1,62 @@
+/*
+ * Copyright © 2016 Quentin "Sardem FF7" Glidic
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial
+ * portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#ifndef XWAYLAND_INTERNAL_INTERFACE_H
+#define XWAYLAND_INTERNAL_INTERFACE_H
+
+struct weston_desktop_xwayland;
+struct weston_desktop_xwayland_surface;
+
+struct weston_xwayland_client_interface {
+	void (*send_configure)(struct weston_surface *surface, int32_t width, int32_t height);
+};
+
+struct weston_desktop_xwayland_interface {
+	struct weston_desktop_xwayland_surface *(*create_surface)(struct weston_desktop_xwayland *xwayland,
+						      struct weston_surface *surface,
+						      const struct weston_xwayland_client_interface *client);
+	void (*set_toplevel)(struct weston_desktop_xwayland_surface *shsurf);
+	void (*set_parent)(struct weston_desktop_xwayland_surface *shsurf,
+			   struct weston_surface *parent);
+	void (*set_transient)(struct weston_desktop_xwayland_surface *shsurf,
+			      struct weston_surface *parent, int x, int y);
+	void (*set_fullscreen)(struct weston_desktop_xwayland_surface *shsurf,
+			       struct weston_output *output);
+	void (*set_xwayland)(struct weston_desktop_xwayland_surface *shsurf,
+			     int x, int y);
+	int (*move)(struct weston_desktop_xwayland_surface *shsurf,
+		    struct weston_pointer *pointer);
+	int (*resize)(struct weston_desktop_xwayland_surface *shsurf,
+		      struct weston_pointer *pointer, uint32_t edges);
+	void (*set_title)(struct weston_desktop_xwayland_surface *shsurf,
+	                  const char *title);
+	void (*set_window_geometry)(struct weston_desktop_xwayland_surface *shsurf,
+				    int32_t x, int32_t y,
+				    int32_t width, int32_t height);
+	void (*set_maximized)(struct weston_desktop_xwayland_surface *shsurf);
+	void (*set_pid)(struct weston_desktop_xwayland_surface *shsurf, pid_t pid);
+};
+
+#endif