xdg-shell: drop automatic surface configuration

Compositors now are expected to wait for an initial commit by checking
wlr_xdg_surface.initial_commit on every surface commit and send
(schedule) configure events manually.

include/types/wlr_xdg_shell.h

@@ -21,7 +21,6 @@ void create_xdg_popup(struct wlr_xdg_surface *surface,
 void reset_xdg_popup(struct wlr_xdg_popup *popup);
 void destroy_xdg_popup(struct wlr_xdg_popup *popup);
 void handle_xdg_popup_client_commit(struct wlr_xdg_popup *popup);
-void handle_xdg_popup_committed(struct wlr_xdg_popup *popup);
 struct wlr_xdg_popup_configure *send_xdg_popup_configure(
 	struct wlr_xdg_popup *popup);
 void handle_xdg_popup_ack_configure(struct wlr_xdg_popup *popup,
@@ -32,7 +31,6 @@ void create_xdg_toplevel(struct wlr_xdg_surface *surface,
 void reset_xdg_toplevel(struct wlr_xdg_toplevel *toplevel);
 void destroy_xdg_toplevel(struct wlr_xdg_toplevel *toplevel);
 void handle_xdg_toplevel_client_commit(struct wlr_xdg_toplevel *toplevel);
-void handle_xdg_toplevel_committed(struct wlr_xdg_toplevel *toplevel);
 struct wlr_xdg_toplevel_configure *send_xdg_toplevel_configure(
 	struct wlr_xdg_toplevel *toplevel);
 void handle_xdg_toplevel_ack_configure(struct wlr_xdg_toplevel *toplevel,

include/wlr/types/wlr_xdg_shell.h

@@ -95,7 +95,6 @@ struct wlr_xdg_popup {
 	struct wl_list link;
 
 	struct wl_resource *resource;
-	bool sent_initial_configure;
 	struct wlr_surface *parent;
 	struct wlr_seat *seat;
 

tinywl/tinywl.c

@@ -86,6 +86,7 @@ struct tinywl_toplevel {
 	struct wlr_scene_tree *scene_tree;
 	struct wl_listener map;
 	struct wl_listener unmap;
+	struct wl_listener commit;
 	struct wl_listener destroy;
 	struct wl_listener request_move;
 	struct wl_listener request_resize;
@@ -93,6 +94,12 @@ struct tinywl_toplevel {
 	struct wl_listener request_fullscreen;
 };
 
+struct tinywl_popup {
+	struct wlr_xdg_popup *xdg_popup;
+	struct wl_listener commit;
+	struct wl_listener destroy;
+};
+
 struct tinywl_keyboard {
 	struct wl_list link;
 	struct tinywl_server *server;
@@ -672,12 +679,26 @@ static void xdg_toplevel_unmap(struct wl_listener *listener, void *data) {
 	wl_list_remove(&toplevel->link);
 }
 
+static void xdg_toplevel_commit(struct wl_listener *listener, void *data) {
+	/* Called when a new surface state is committed. */
+	struct tinywl_toplevel *toplevel = wl_container_of(listener, toplevel, commit);
+
+	if (toplevel->xdg_toplevel->base->initial_commit) {
+		/* When an xdg_surface performs an initial commit, the compositor must
+		 * reply with a configure so the client can map the surface. tinywl
+		 * configures the xdg_toplevel with 0,0 size to let the client pick the
+		 * dimensions itself. */
+		wlr_xdg_toplevel_set_size(toplevel->xdg_toplevel, 0, 0);
+	}
+}
+
 static void xdg_toplevel_destroy(struct wl_listener *listener, void *data) {
 	/* Called when the xdg_toplevel is destroyed. */
 	struct tinywl_toplevel *toplevel = wl_container_of(listener, toplevel, destroy);
 
 	wl_list_remove(&toplevel->map.link);
 	wl_list_remove(&toplevel->unmap.link);
+	wl_list_remove(&toplevel->commit.link);
 	wl_list_remove(&toplevel->destroy.link);
 	wl_list_remove(&toplevel->request_move.link);
 	wl_list_remove(&toplevel->request_resize.link);
@@ -793,6 +814,8 @@ static void server_new_xdg_toplevel(struct wl_listener *listener, void *data) {
 	wl_signal_add(&xdg_toplevel->base->surface->events.map, &toplevel->map);
 	toplevel->unmap.notify = xdg_toplevel_unmap;
 	wl_signal_add(&xdg_toplevel->base->surface->events.unmap, &toplevel->unmap);
+	toplevel->commit.notify = xdg_toplevel_commit;
+	wl_signal_add(&xdg_toplevel->base->surface->events.commit, &toplevel->commit);
 
 	toplevel->destroy.notify = xdg_toplevel_destroy;
 	wl_signal_add(&xdg_toplevel->events.destroy, &toplevel->destroy);
@@ -808,10 +831,37 @@ static void server_new_xdg_toplevel(struct wl_listener *listener, void *data) {
 	wl_signal_add(&xdg_toplevel->events.request_fullscreen, &toplevel->request_fullscreen);
 }
 
+static void xdg_popup_commit(struct wl_listener *listener, void *data) {
+	/* Called when a new surface state is committed. */
+	struct tinywl_popup *popup = wl_container_of(listener, popup, commit);
+
+	if (popup->xdg_popup->base->initial_commit) {
+		/* When an xdg_surface performs an initial commit, the compositor must
+		 * reply with a configure so the client can map the surface.
+		 * tinywl sends an empty configure. A more sophisticated compositor
+		 * might change an xdg_popup's geometry to ensure it's not positioned
+		 * off-screen, for example. */
+		wlr_xdg_surface_schedule_configure(popup->xdg_popup->base);
+	}
+}
+
+static void xdg_popup_destroy(struct wl_listener *listener, void *data) {
+	/* Called when the xdg_popup is destroyed. */
+	struct tinywl_popup *popup = wl_container_of(listener, popup, destroy);
+
+	wl_list_remove(&popup->commit.link);
+	wl_list_remove(&popup->destroy.link);
+
+	free(popup);
+}
+
 static void server_new_xdg_popup(struct wl_listener *listener, void *data) {
 	/* This event is raised when a client creates a new popup. */
 	struct wlr_xdg_popup *xdg_popup = data;
 
+	struct tinywl_popup *popup = calloc(1, sizeof(*popup));
+	popup->xdg_popup = xdg_popup;
+
 	/* We must add xdg popups to the scene graph so they get rendered. The
 	 * wlroots scene graph provides a helper for this, but to use it we must
 	 * provide the proper parent scene node of the xdg popup. To enable this,
@@ -821,6 +871,12 @@ static void server_new_xdg_popup(struct wl_listener *listener, void *data) {
 	assert(parent != NULL);
 	struct wlr_scene_tree *parent_tree = parent->data;
 	xdg_popup->base->data = wlr_scene_xdg_surface_create(parent_tree, xdg_popup->base);
+
+	popup->commit.notify = xdg_popup_commit;
+	wl_signal_add(&xdg_popup->base->surface->events.commit, &popup->commit);
+
+	popup->destroy.notify = xdg_popup_destroy;
+	wl_signal_add(&xdg_popup->events.destroy, &popup->destroy);
 }
 
 int main(int argc, char *argv[]) {

types/xdg_shell/wlr_xdg_popup.c

@@ -246,13 +246,6 @@ void handle_xdg_popup_client_commit(struct wlr_xdg_popup *popup) {
 	}
 }
 
-void handle_xdg_popup_committed(struct wlr_xdg_popup *popup) {
-	if (popup->base->initial_commit && !popup->sent_initial_configure) {
-		wlr_xdg_surface_schedule_configure(popup->base);
-		popup->sent_initial_configure = true;
-	}
-}
-
 static const struct xdg_popup_interface xdg_popup_implementation;
 
 struct wlr_xdg_popup *wlr_xdg_popup_from_resource(
@@ -285,7 +278,7 @@ static void xdg_popup_handle_grab(struct wl_client *client,
 		wlr_xdg_popup_destroy(popup);
 		return;
 	}
-	if (popup->sent_initial_configure) {
+	if (popup->base->surface->mapped) {
 		wl_resource_post_error(popup->resource,
 			XDG_POPUP_ERROR_INVALID_GRAB,
 			"xdg_popup is already mapped");
@@ -472,8 +465,6 @@ void reset_xdg_popup(struct wlr_xdg_popup *popup) {
 
 		popup->seat = NULL;
 	}
-
-	popup->sent_initial_configure = false;
 }
 
 void destroy_xdg_popup(struct wlr_xdg_popup *popup) {

types/xdg_shell/wlr_xdg_surface.c

@@ -309,16 +309,12 @@ static void xdg_surface_role_commit(struct wlr_surface *wlr_surface) {
 		assert(0 && "not reached");
 		return;
 	case WLR_XDG_SURFACE_ROLE_TOPLEVEL:
-		if (surface->toplevel != NULL) {
+		if (surface->toplevel == NULL) {
-			handle_xdg_toplevel_committed(surface->toplevel);
-		} else {
 			return;
 		}
 		break;
 	case WLR_XDG_SURFACE_ROLE_POPUP:
-		if (surface->popup != NULL) {
+		if (surface->popup == NULL) {
-			handle_xdg_popup_committed(surface->popup);
-		} else {
 			return;
 		}
 		break;

types/xdg_shell/wlr_xdg_toplevel.c

@@ -131,24 +131,6 @@ void handle_xdg_toplevel_client_commit(struct wlr_xdg_toplevel *toplevel) {
 	}
 }
 
-void handle_xdg_toplevel_committed(struct wlr_xdg_toplevel *toplevel) {
-	if (toplevel->base->initial_commit) {
-		// On the initial commit, send a configure request to tell the client it
-		// is added
-		wlr_xdg_surface_schedule_configure(toplevel->base);
-
-		if (toplevel->base->client->shell->version >=
-				XDG_TOPLEVEL_WM_CAPABILITIES_SINCE_VERSION) {
-			// The first configure event must carry WM capabilities
-			wlr_xdg_toplevel_set_wm_capabilities(toplevel,
-				WLR_XDG_TOPLEVEL_WM_CAPABILITIES_WINDOW_MENU |
-				WLR_XDG_TOPLEVEL_WM_CAPABILITIES_MAXIMIZE |
-				WLR_XDG_TOPLEVEL_WM_CAPABILITIES_FULLSCREEN |
-				WLR_XDG_TOPLEVEL_WM_CAPABILITIES_MINIMIZE);
-		}
-	}
-}
-
 static const struct xdg_toplevel_interface xdg_toplevel_implementation;
 
 struct wlr_xdg_toplevel *wlr_xdg_toplevel_from_resource(
@@ -506,6 +488,16 @@ void create_xdg_toplevel(struct wlr_xdg_surface *surface,
 
 	set_xdg_surface_role_object(surface, surface->toplevel->resource);
 
+	if (surface->client->shell->version >= XDG_TOPLEVEL_WM_CAPABILITIES_SINCE_VERSION) {
+		// The first configure event must carry WM capabilities
+		surface->toplevel->scheduled.wm_capabilities =
+			WLR_XDG_TOPLEVEL_WM_CAPABILITIES_WINDOW_MENU |
+			WLR_XDG_TOPLEVEL_WM_CAPABILITIES_MAXIMIZE |
+			WLR_XDG_TOPLEVEL_WM_CAPABILITIES_FULLSCREEN |
+			WLR_XDG_TOPLEVEL_WM_CAPABILITIES_MINIMIZE;
+		surface->toplevel->scheduled.fields |= WLR_XDG_TOPLEVEL_CONFIGURE_WM_CAPABILITIES;
+	}
+
 	wl_signal_emit_mutable(&surface->client->shell->events.new_toplevel, surface->toplevel);
 
 	return;