From 55296643e9ba982c2c00a52e0066c4f3722706b6 Mon Sep 17 00:00:00 2001
From: Consolatis <35009135+Consolatis@users.noreply.github.com>
Date: Mon, 27 Mar 2023 04:12:21 +0200
Subject: [PATCH] implement xdg-decoration-unstable-v1

This allows requesting server side decorations if supported by the
compositor. Adds a new config option `window.decorations` with values
- `yes`  (always request server side decorations)
- `no`   (always request client side decorations, e.g. no decorations)
- `auto` (tell the compositor to use whatever it prefers)

The new setting defaults to `auto`.
---
 .gitignore |  1 +
 Makefile   |  7 ++++---
 havoc.cfg  |  3 +++
 main.c     | 45 +++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 53 insertions(+), 3 deletions(-)

diff --git a/.gitignore b/.gitignore
index c0934ed..dbcb83c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,4 +2,5 @@
 *.a
 xdg-shell.[ch]
 gtk-primary-selection.[ch]
+xdg-decoration-unstable-v1.[ch]
 havoc
diff --git a/Makefile b/Makefile
index 53a1d5d..e3e2518 100644
--- a/Makefile
+++ b/Makefile
@@ -9,10 +9,11 @@ VERSION="0.4.0-git"
 CFLAGS ?= -Wall -Wextra -Wno-unused-parameter -Wno-parentheses
 override CFLAGS += -DVERSION=\"$(VERSION)\"
 
-VPATH=$(WAYLAND_PROTOCOLS_DIR)/stable/xdg-shell
+VPATH=$(WAYLAND_PROTOCOLS_DIR)/stable/xdg-shell:$(WAYLAND_PROTOCOLS_DIR)/unstable/xdg-decoration
 LIBS=-lrt -lm -lutil -lwayland-client -lwayland-cursor -lxkbcommon -Ltsm -lhtsm
-OBJ=xdg-shell.o gtk-primary-selection.o glyph.o main.o
-GEN=xdg-shell.c xdg-shell.h gtk-primary-selection.c gtk-primary-selection.h
+OBJ=xdg-shell.o xdg-decoration-unstable-v1.o gtk-primary-selection.o glyph.o main.o
+GEN=xdg-shell.c xdg-shell.h xdg-decoration-unstable-v1.c \
+	xdg-decoration-unstable-v1.h gtk-primary-selection.c gtk-primary-selection.h
 
 havoc: tsm $(OBJ)
 	$(CC) $(LDFLAGS) -o $@ $(OBJ) $(LIBS)
diff --git a/havoc.cfg b/havoc.cfg
index abb3d59..f1d9150 100644
--- a/havoc.cfg
+++ b/havoc.cfg
@@ -9,6 +9,9 @@ opacity=230
 # render a margin to exactly match window size hints from the compositor
 margin=no
 
+# request server side decorations if available by the compositor [yes|no|auto]
+decorations=auto
+
 [terminal]
 # size of terminal
 rows=16
diff --git a/main.c b/main.c
index 29064f7..97a2c0e 100644
--- a/main.c
+++ b/main.c
@@ -23,6 +23,7 @@
 #include "tsm/libtsm.h"
 #include "xdg-shell.h"
 #include "gtk-primary-selection.h"
+#include "xdg-decoration-unstable-v1.h"
 
 #define ARRAY_LENGTH(a) (sizeof (a) / sizeof (a)[0])
 
@@ -30,6 +31,12 @@ int font_init(int, char *, int *, int *);
 void font_deinit(void);
 unsigned char *get_glyph(uint32_t, uint32_t, int);
 
+enum deco {
+	DECO_AUTO,
+	DECO_SERVER,
+	DECO_NONE
+};
+
 static struct {
 	bool die;
 	bool configured;
@@ -132,6 +139,11 @@ static struct {
 		bool active;
 	} paste;
 
+	struct {
+		struct zxdg_decoration_manager_v1 *manager;
+		struct zxdg_toplevel_decoration_v1 *deco;
+	} deco;
+
 	struct {
 		bool linger;
 		char *config;
@@ -152,6 +164,7 @@ static struct {
 		int scrollback;
 		bool margin;
 		unsigned char opacity;
+		enum deco decorations;
 		int font_size;
 		char font_path[512];
 		uint8_t colors[TSM_COLOR_NUM][3];
@@ -163,6 +176,7 @@ static struct {
 	.cfg.scrollback = 0,
 	.cfg.margin = false,
 	.cfg.opacity = 0xff,
+	.cfg.decorations = DECO_AUTO,
 	.cfg.font_size = 18,
 	.cfg.font_path = "",
 	.cfg.colors = {
@@ -1503,6 +1517,26 @@ static void registry_get(void *data, struct wl_registry *r, uint32_t id,
 	} else if (strcmp(i, "gtk_primary_selection_device_manager") == 0) {
 		term.ps_dm = wl_registry_bind(r, id,
 			&gtk_primary_selection_device_manager_interface, 1);
+	} else if (strcmp(i, "zxdg_decoration_manager_v1") == 0) {
+		term.deco.manager = wl_registry_bind(r, id,
+			&zxdg_decoration_manager_v1_interface, 1);
+	}
+}
+
+static void setup_deco(void)
+{
+	if (term.deco.manager) {
+		term.deco.deco =
+			zxdg_decoration_manager_v1_get_toplevel_decoration(
+				term.deco.manager, term.toplvl);
+
+		if (term.cfg.decorations == DECO_AUTO)
+			zxdg_toplevel_decoration_v1_unset_mode(term.deco.deco);
+		else
+			zxdg_toplevel_decoration_v1_set_mode(term.deco.deco,
+				term.cfg.decorations == DECO_NONE
+				? ZXDG_TOPLEVEL_DECORATION_V1_MODE_CLIENT_SIDE
+				: ZXDG_TOPLEVEL_DECORATION_V1_MODE_SERVER_SIDE);
 	}
 }
 
@@ -1626,6 +1660,9 @@ static void window_config(char *key, char *val)
 		term.cfg.opacity = cfg_num(val, 10, 0, 255);
 	else if (strcmp(key, "margin") == 0)
 		term.cfg.margin = strcmp(val, "yes") == 0;
+	else if (strcmp(key, "decorations") == 0)
+		term.cfg.decorations = strcmp(val, "yes") == 0 ? DECO_SERVER
+			: (strcmp(val, "no") == 0 ? DECO_NONE : DECO_AUTO);
 }
 
 static void terminal_config(char *key, char *val)
@@ -1937,6 +1974,8 @@ int main(int argc, char *argv[])
 	xdg_toplevel_set_title(term.toplvl, "havoc");
 	xdg_toplevel_set_app_id(term.toplvl, term.opt.app_id);
 
+	setup_deco();
+
 	wl_surface_commit(term.surf);
 	term.can_redraw = true;
 
@@ -2005,6 +2044,12 @@ int main(int argc, char *argv[])
 	if (term.kbd)
 		wl_keyboard_release(term.kbd);
 
+	if (term.deco.deco)
+		zxdg_toplevel_decoration_v1_destroy(term.deco.deco);
+
+	if (term.deco.manager)
+		zxdg_decoration_manager_v1_destroy(term.deco.manager);
+
 	xdg_toplevel_destroy(term.toplvl);
 etoplvl:
 	xdg_surface_destroy(term.xdgsurf);