From 2c4e03cc82d5c7779ba4436fbccc9ad5269ae583 Mon Sep 17 00:00:00 2001
From: Arti Zirk <arti.zirk@gmail.com>
Date: Sun, 3 Jan 2021 19:42:20 +0200
Subject: [PATCH] Add server side decoration to the window

---
 .gitignore |  1 +
 Makefile   | 14 +++++++++++---
 surface.c  | 17 +++++++++++++++++
 3 files changed, 29 insertions(+), 3 deletions(-)

diff --git a/.gitignore b/.gitignore
index 0057990..614b27d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 .idea/
 surface
 xdg-shell*
+xdg-decoration*
diff --git a/Makefile b/Makefile
index 8be4cfb..22ec99f 100644
--- a/Makefile
+++ b/Makefile
@@ -4,9 +4,10 @@ WAYLAND_SCANNER = $(shell pkg-config --variable=wayland_scanner wayland-scanner)
 CFLAGS ?= -std=c11 -Wall -Wextra -Werror -Wno-unused-parameter -ggdb
 
 XDG_SHELL_PROTOCOL = $(WAYLAND_PROTOCOLS_DIR)/stable/xdg-shell/xdg-shell.xml
+XDG_DECORATION_PROTOCOL = $(WAYLAND_PROTOCOLS_DIR)/unstable/xdg-decoration/xdg-decoration-unstable-v1.xml
 
-HEADERS=xdg-shell-client-protocol.h
-SOURCES=surface.c xdg-shell-protocol.c
+HEADERS=xdg-shell-client-protocol.h xdg-decoration-client-protocol.h
+SOURCES=surface.c xdg-shell-protocol.c xdg-decoration-protocol.c
 
 all: surface
 
@@ -19,7 +20,14 @@ xdg-shell-client-protocol.h:
 xdg-shell-protocol.c:
 	$(WAYLAND_SCANNER) private-code $(XDG_SHELL_PROTOCOL) xdg-shell-protocol.c
 
+xdg-decoration-client-protocol.h:
+	$(WAYLAND_SCANNER) client-header $(XDG_DECORATION_PROTOCOL) xdg-decoration-client-protocol.h
+
+xdg-decoration-protocol.c:
+	$(WAYLAND_SCANNER) private-code $(XDG_DECORATION_PROTOCOL) xdg-decoration-protocol.c
 
 .PHONY: clean
 clean:
-	$(RM) surface xdg-shell-protocol.c xdg-shell-client-protocol.h
\ No newline at end of file
+	$(RM) surface \
+		xdg-shell-protocol.c xdg-shell-client-protocol.h \
+		xdg-decoration-protocol.c xdg-decoration-client-protocol.h
\ No newline at end of file
diff --git a/surface.c b/surface.c
index 76659dc..8315a72 100644
--- a/surface.c
+++ b/surface.c
@@ -6,6 +6,7 @@
 //#include <wayland-server.h>
 #include <wayland-client-protocol.h>
 #include "xdg-shell-client-protocol.h"
+#include "xdg-decoration-client-protocol.h"
 #include <fcntl.h>
 #include <sys/mman.h>
 #include <errno.h>
@@ -20,6 +21,7 @@ struct client_state {
     struct wl_compositor *wl_compositor;
     struct wl_shm *wl_shm;
     struct xdg_wm_base *xdg_wm_base;
+    struct zxdg_decoration_manager_v1 *zxdg_decoration_manager_v1;
     /* Objects */
     struct wl_buffer *wl_buffer;
     struct wl_surface *wl_surface;
@@ -202,6 +204,9 @@ global_registry_handler(void *data, struct wl_registry *registry, uint32_t id,
         state->xdg_wm_base = wl_registry_bind(registry, id,
                                               &xdg_wm_base_interface, 1);
         xdg_wm_base_add_listener(state->xdg_wm_base, &xdg_wm_base_listener, state);
+    } else if (strcmp(interface, zxdg_decoration_manager_v1_interface.name) == 0) {
+        state->zxdg_decoration_manager_v1 = wl_registry_bind(registry, id,
+                                &zxdg_decoration_manager_v1_interface, 1);
     }
 }
 
@@ -304,6 +309,18 @@ int main(int argc, char **argv) {
     } else {
         fprintf(stderr, "got xdg_toplevel\n");
     }
+
+    if (state.zxdg_decoration_manager_v1 != NULL){
+        struct zxdg_toplevel_decoration_v1 *decoration = \
+                    zxdg_decoration_manager_v1_get_toplevel_decoration(state.zxdg_decoration_manager_v1,
+                                                           state.xdg_toplevel);
+        zxdg_toplevel_decoration_v1_set_mode(decoration, ZXDG_TOPLEVEL_DECORATION_V1_MODE_SERVER_SIDE);
+        fprintf(stderr, "Using serverside decorations");
+    } else {
+        fprintf(stderr, "Serverside decoration not available");
+    }
+
+
     xdg_toplevel_add_listener(state.xdg_toplevel, &xdg_toplevel_listener, &state);
     xdg_toplevel_set_title(state.xdg_toplevel, "A surface");
     wl_surface_commit(state.wl_surface);