Implement KDE's server-side decoration protocol

include/sway/extensions.h

@@ -42,8 +42,15 @@ struct swaylock_state {
 	wlc_resource surface;
 };
 
+struct decoration_state {
+	list_t *csd_resources;
+};
+
 extern struct desktop_shell_state desktop_shell;
+extern struct decoration_state decoration_state;
 
 void register_extensions(void);
 
+void server_decoration_enable_csd(wlc_handle handle);
+
 #endif

protocols/CMakeLists.txt

@@ -27,6 +27,11 @@ WAYLAND_ADD_PROTOCOL_SERVER(proto-server-gamma-control
 	gamma-control
 )
 
+WAYLAND_ADD_PROTOCOL_SERVER(proto-server-server-decoration
+	server-decoration.xml
+	server-decoration
+)
+
 add_library(sway-protocols STATIC
 	${proto-client-xdg-shell}
 	${proto-client-desktop-shell}
@@ -34,6 +39,7 @@ add_library(sway-protocols STATIC
 	${proto-client-swaylock}
 	${proto-server-swaylock}
 	${proto-server-gamma-control}
+	${proto-server-server-decoration}
 	)
 
 set(PROTOCOLS_INCLUDE_DIRS ${CMAKE_BINARY_DIR}/protocols PARENT_SCOPE)

protocols/server-decoration.xml

@@ -0,0 +1,94 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<protocol name="server_decoration">
+  <copyright><![CDATA[
+    Copyright (C) 2015 Martin Gräßlin
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation, either version 2.1 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+  ]]></copyright>
+  <interface  name="org_kde_kwin_server_decoration_manager" version="1">
+      <description summary="Server side window decoration manager">
+        This interface allows to coordinate whether the server should create
+        a server-side window decoration around a wl_surface representing a
+        shell surface (wl_shell_surface or similar). By announcing support
+        for this interface the server indicates that it supports server
+        side decorations.
+      </description>
+      <request name="create">
+        <description summary="Create a server-side decoration object for a given surface">
+            When a client creates a server-side decoration object it indicates
+            that it supports the protocol. The client is supposed to tell the
+            server whether it wants server-side decorations or will provide
+            client-side decorations.
+
+            If the client does not create a server-side decoration object for
+            a surface the server interprets this as lack of support for this
+            protocol and considers it as client-side decorated. Nevertheless a
+            client-side decorated surface should use this protocol to indicate
+            to the server that it does not want a server-side deco.
+        </description>
+        <arg name="id" type="new_id" interface="org_kde_kwin_server_decoration"/>
+        <arg name="surface" type="object" interface="wl_surface"/>
+      </request>
+      <enum name="mode">
+            <description summary="Possible values to use in request_mode and the event mode."/>
+            <entry name="None" value="0" summary="Undecorated: The surface is not decorated at all, neither server nor client-side. An example is a popup surface which should not be decorated."/>
+            <entry name="Client" value="1" summary="Client-side decoration: The decoration is part of the surface and the client."/>
+            <entry name="Server" value="2" summary="Server-side decoration: The server embeds the surface into a decoration frame."/>
+      </enum>
+      <event name="default_mode">
+          <description summary="The default mode used on the server">
+              This event is emitted directly after binding the interface. It contains
+              the default mode for the decoration. When a new server decoration object
+              is created this new object will be in the default mode until the first
+              request_mode is requested.
+
+              The server may change the default mode at any time.
+          </description>
+          <arg name="mode" type="uint" summary="The default decoration mode applied to newly created server decorations."/>
+      </event>
+  </interface>
+  <interface name="org_kde_kwin_server_decoration" version="1">
+      <request name="release" type="destructor">
+        <description summary="release the server decoration object"/>
+      </request>
+      <enum name="mode">
+            <description summary="Possible values to use in request_mode and the event mode."/>
+            <entry name="None" value="0" summary="Undecorated: The surface is not decorated at all, neither server nor client-side. An example is a popup surface which should not be decorated."/>
+            <entry name="Client" value="1" summary="Client-side decoration: The decoration is part of the surface and the client."/>
+            <entry name="Server" value="2" summary="Server-side decoration: The server embeds the surface into a decoration frame."/>
+      </enum>
+      <request name="request_mode">
+          <description summary="The decoration mode the surface wants to use."/>
+          <arg name="mode" type="uint" summary="The mode this surface wants to use."/>
+      </request>
+      <event name="mode">
+          <description summary="The new decoration mode applied by the server">
+              This event is emitted directly after the decoration is created and
+              represents the base decoration policy by the server. E.g. a server
+              which wants all surfaces to be client-side decorated will send Client,
+              a server which wants server-side decoration will send Server.
+
+              The client can request a different mode through the decoration request.
+              The server will acknowledge this by another event with the same mode. So
+              even if a server prefers server-side decoration it's possible to force a
+              client-side decoration.
+
+              The server may emit this event at any time. In this case the client can
+              again request a different mode. It's the responsibility of the server to
+              prevent a feedback loop.
+          </description>
+          <arg name="mode" type="uint" summary="The decoration mode applied to the surface by the server."/>
+      </event>
+  </interface>
+</protocol>

sway/extensions.c

@@ -5,6 +5,7 @@
 #include "wayland-desktop-shell-server-protocol.h"
 #include "wayland-swaylock-server-protocol.h"
 #include "wayland-gamma-control-server-protocol.h"
+#include "wayland-server-decoration-server-protocol.h"
 #include "sway/layout.h"
 #include "sway/input_state.h"
 #include "sway/extensions.h"
@@ -13,6 +14,7 @@
 #include "log.h"
 
 struct desktop_shell_state desktop_shell;
+struct decoration_state decoration_state;
 
 static struct panel_config *find_or_create_panel_config(struct wl_resource *resource) {
 	for (int i = 0; i < desktop_shell.panels->length; i++) {
@@ -173,7 +175,7 @@ static struct desktop_shell_interface desktop_shell_implementation = {
 };
 
 static void desktop_shell_bind(struct wl_client *client, void *data,
-		unsigned int version, unsigned int id) {
+		uint32_t version, uint32_t id) {
 	if (version > 3) {
 		// Unsupported version
 		return;
@@ -232,7 +234,7 @@ static struct lock_interface swaylock_implementation = {
 };
 
 static void swaylock_bind(struct wl_client *client, void *data,
-		unsigned int version, unsigned int id) {
+		uint32_t version, uint32_t id) {
 	if (version > 1) {
 		// Unsupported version
 		return;
@@ -305,28 +307,101 @@ static struct gamma_control_manager_interface gamma_manager_implementation = {
 };
 
 static void gamma_control_manager_bind(struct wl_client *client, void *data,
-		unsigned int version, unsigned int fd) {
+		uint32_t version, uint32_t id) {
 	if (version > 1) {
 		// Unsupported version
 		return;
 	}
-
 	struct wl_resource *resource = wl_resource_create(client,
-			&gamma_control_manager_interface, version, fd);
+			&gamma_control_manager_interface, version, id);
 	if (!resource) {
 		wl_client_post_no_memory(client);
 	}
-
 	wl_resource_set_implementation(resource, &gamma_manager_implementation, NULL, NULL);
 }
 
+static void server_decoration_release(struct wl_client *client,
+		struct wl_resource *resource) {
+	wl_resource_destroy(resource);
+}
+
+void server_decoration_enable_csd(wlc_handle handle) {
+	swayc_t *view = swayc_by_handle(handle);
+	if (!view) {
+		sway_log(L_DEBUG, "view invalid");
+		return;
+	}
+	sway_log(L_DEBUG, "%s requested client side decorations", view->name);
+	view->border_type = B_NONE;
+	update_geometry(view);
+}
+
+static void server_decoration_request_mode(struct wl_client *client,
+		struct wl_resource *resource, uint32_t mode) {
+	sway_log(L_DEBUG, "Client requested server decoration mode %d", mode);
+	if (mode == ORG_KDE_KWIN_SERVER_DECORATION_MODE_SERVER) {
+		return;
+	}
+	struct wl_resource *surface = wl_resource_get_user_data(resource);
+	if (!surface) {
+		sway_log(L_DEBUG, "surface invalid");
+		return;
+	}
+	wlc_handle handle = wlc_handle_from_wl_surface_resource(surface);
+	if (!handle) {
+		list_add(decoration_state.csd_resources, surface);
+		return;
+	}
+	server_decoration_enable_csd(handle);
+}
+
+static struct org_kde_kwin_server_decoration_interface server_decoration_implementation = {
+	.release = server_decoration_release,
+	.request_mode = server_decoration_request_mode,
+};
+
+static void server_decoration_manager_create(struct wl_client *client,
+		struct wl_resource *resource, uint32_t id, struct wl_resource *surface) {
+	sway_log(L_DEBUG, "Client requested server decoration manager");
+	struct wl_resource *manager = wl_resource_create(client,
+			&org_kde_kwin_server_decoration_interface, 1, id);
+	if (!manager) {
+		wl_client_post_no_memory(client);
+	}
+	wl_resource_set_implementation(manager, &server_decoration_implementation, surface, NULL);
+}
+
+// Jesus christ KDE, these names are whack as hell
+static struct org_kde_kwin_server_decoration_manager_interface server_decoration_manager_implementation = {
+	.create = server_decoration_manager_create,
+};
+
+static void server_decoration_manager_bind(struct wl_client *client, void *data,
+		uint32_t version, uint32_t id) {
+	if (version > 1) {
+		// Unsupported version
+		return;
+	}
+	struct wl_resource *resource = wl_resource_create(client,
+			&org_kde_kwin_server_decoration_manager_interface, version, id);
+	if (!resource) {
+		wl_client_post_no_memory(client);
+	}
+	wl_resource_set_implementation(resource, &server_decoration_manager_implementation, NULL, NULL);
+	org_kde_kwin_server_decoration_manager_send_default_mode(resource,
+			ORG_KDE_KWIN_SERVER_DECORATION_MODE_SERVER);
+}
+
 void register_extensions(void) {
 	wl_global_create(wlc_get_wl_display(), &desktop_shell_interface, 3, NULL, desktop_shell_bind);
 	desktop_shell.backgrounds = create_list();
 	desktop_shell.panels = create_list();
 	desktop_shell.lock_surfaces = create_list();
 	desktop_shell.is_locked = false;
+	decoration_state.csd_resources = create_list();
 	wl_global_create(wlc_get_wl_display(), &lock_interface, 1, NULL, swaylock_bind);
 	wl_global_create(wlc_get_wl_display(), &gamma_control_manager_interface, 1,
 			NULL, gamma_control_manager_bind);
+	wl_global_create(wlc_get_wl_display(), &org_kde_kwin_server_decoration_manager_interface ,
+			1, NULL, server_decoration_manager_bind);
 }

sway/handlers.c

@@ -345,6 +345,8 @@ static bool handle_view_created(wlc_handle handle) {
 	swayc_t *current_ws = swayc_active_workspace();
 	bool return_to_workspace = false;
 	struct wl_client *client = wlc_view_get_wl_client(handle);
+	struct wl_resource *resource = wlc_surface_get_wl_resource(
+		wlc_view_get_surface(handle));
 	pid_t pid;
 	struct panel_config *panel_config = NULL;
 	struct background_config *background_config = NULL;
@@ -483,6 +485,14 @@ static bool handle_view_created(wlc_handle handle) {
 		if (workspace && workspace->fullscreen) {
 			set_focused_container(workspace->fullscreen);
 		}
+		for (int i = 0; i < decoration_state.csd_resources->length; ++i) {
+			struct wl_resource *res = decoration_state.csd_resources->items[i];
+			if (res == resource) {
+				list_del(decoration_state.csd_resources, i);
+				server_decoration_enable_csd(handle);
+				break;
+			}
+		}
 	} else {
 		swayc_t *output = swayc_parent_by_type(focused, C_OUTPUT);
 		wlc_handle *h = malloc(sizeof(wlc_handle));