From bb4d9a5fd33cf1a7c08c096721e5640022de0315 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Daniel=20Ekl=C3=B6f?= <daniel@ekloef.se>
Date: Fri, 12 Feb 2021 11:29:36 +0100
Subject: [PATCH] wayland: add wayl_win_subsurface_new() and
 wayl_win_subsurface_destroy()

These are utility functions to create a Wayland subsurface associated
with the window.
---
 wayland.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 wayland.h | 14 +++++++++++++-
 2 files changed, 60 insertions(+), 1 deletion(-)

diff --git a/wayland.c b/wayland.c
index 1bb95d68..1dfd04ba 100644
--- a/wayland.c
+++ b/wayland.c
@@ -1570,3 +1570,50 @@ wayl_roundtrip(struct wayland *wayl)
         wl_display_dispatch_pending(wayl->display);
     wayl_flush(wayl);
 }
+
+bool
+wayl_win_subsurface_new_with_custom_parent(
+    struct wl_window *win, struct wl_surface *parent,
+    struct wl_surf_subsurf *surf)
+{
+    struct wayland *wayl = win->term->wl;
+
+    surf->surf = NULL;
+    surf->sub = NULL;
+
+    struct wl_surface *main = wl_compositor_create_surface(wayl->compositor);
+    if (main == NULL)
+        return false;
+
+    struct wl_subsurface *sub = wl_subcompositor_get_subsurface(
+        wayl->sub_compositor, main, parent);
+
+    if (sub == NULL) {
+        wl_surface_destroy(main);
+        return false;
+    }
+
+    wl_surface_set_user_data(main, win);
+    wl_subsurface_set_sync(sub);
+
+    surf->surf = main;
+    surf->sub = sub;
+    return true;
+}
+
+bool
+wayl_win_subsurface_new(struct wl_window *win, struct wl_surf_subsurf *surf)
+{
+    return wayl_win_subsurface_new_with_custom_parent(win, win->surface, surf);
+}
+
+void
+wayl_win_subsurface_destroy(struct wl_surf_subsurf *surf)
+{
+    if (surf == NULL)
+        return;
+    if (surf->sub != NULL)
+        wl_subsurface_destroy(surf->sub);
+    if (surf->surf != NULL)
+        wl_surface_destroy(surf->surf);
+}
diff --git a/wayland.h b/wayland.h
index bd1102c4..2e4c7037 100644
--- a/wayland.h
+++ b/wayland.h
@@ -350,6 +350,11 @@ struct monitor {
     bool use_output_release;
 };
 
+struct wl_surf_subsurf {
+    struct wl_surface *surf;
+    struct wl_subsurface *sub;
+};
+
 struct wl_url {
     const struct url *url;
     struct wl_surface *surf;
@@ -453,10 +458,17 @@ struct wayland {
 struct wayland *wayl_init(const struct config *conf, struct fdm *fdm);
 void wayl_destroy(struct wayland *wayl);
 
+bool wayl_reload_xcursor_theme(struct seat *seat, int new_scale);
+
 void wayl_flush(struct wayland *wayl);
 void wayl_roundtrip(struct wayland *wayl);
 
 struct wl_window *wayl_win_init(struct terminal *term);
 void wayl_win_destroy(struct wl_window *win);
 
-bool wayl_reload_xcursor_theme(struct seat *seat, int new_scale);
+bool wayl_win_subsurface_new(
+    struct wl_window *win, struct wl_surf_subsurf *surf);
+bool wayl_win_subsurface_new_with_custom_parent(
+    struct wl_window *win, struct wl_surface *parent,
+    struct wl_surf_subsurf *surf);
+void wayl_win_subsurface_destroy(struct wl_surf_subsurf *surf);