From 811ca199c444525dc4d846d38f76554f1a9b48b0 Mon Sep 17 00:00:00 2001
From: Kirill Primak <vyivel@eclair.cafe>
Date: Thu, 23 Nov 2023 16:10:39 +0300
Subject: 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.
---
 tinywl/tinywl.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)

(limited to 'tinywl')

diff --git a/tinywl/tinywl.c b/tinywl/tinywl.c
index bd21dd91..0342ec54 100644
--- a/tinywl/tinywl.c
+++ b/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[]) {
-- 
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