diff --git a/src/deco.rs b/src/deco.rs
index 09dcc56..c1539e9 100644
--- a/src/deco.rs
+++ b/src/deco.rs
@@ -26,6 +26,7 @@ use crate::{
 #[derive(Default, Debug, Clone, PartialEq)]
 struct DecoParams {
     has_geometry: bool,
+    prefers_ssd: bool,
     is_active: bool,
     bounds: Bounds,
     restricted_edges: Edges<bool>,
@@ -34,7 +35,6 @@ struct DecoParams {
 pub struct Deco {
     last_params: RefCell<DecoParams>,
     next_params: RefCell<DecoParams>,
-    top_size: i32,
     border_size: i32,
 
     wl_surface: Rc<WlSurface>,
@@ -133,6 +133,15 @@ impl DecoSurface {
 }
 
 impl Deco {
+    fn top_size(&self) -> i32 {
+        let params = self.last_params.borrow();
+        if params.prefers_ssd {
+            self.border_size + 24
+        } else {
+            self.border_size
+        }
+    }
+
     pub fn new(
         host_surface: &Rc<WlSurface>,
         toplevel: &Rc<XdgToplevel>,
@@ -151,7 +160,6 @@ impl Deco {
         let deco = Rc::new(Deco {
             last_params: RefCell::new(Default::default()),
             next_params: RefCell::new(Default::default()),
-            top_size: args.thickness as i32, // TODO: title
             border_size: args.thickness as i32,
             wl_surface: wl_surface.clone(),
             subsurface,
@@ -200,8 +208,8 @@ impl Deco {
             height,
         };
         let width = width + self.border_size * 2;
-        let height = height + self.top_size + self.border_size;
-        (x - self.border_size, y - self.top_size, width, height)
+        let height = height + self.top_size() + self.border_size;
+        (x - self.border_size, y - self.top_size(), width, height)
     }
 
     pub fn set_restricted_edges(&self, edges: Edges<bool>) {
@@ -214,6 +222,11 @@ impl Deco {
         params.is_active = is_active;
     }
 
+    pub fn set_prefers_ssd(&self, prefers_ssd: bool) {
+        let mut params = self.next_params.borrow_mut();
+        params.prefers_ssd = prefers_ssd;
+    }
+
     pub fn handle_commit(&self) -> eyre::Result<()> {
         self.draw()
     }
@@ -221,19 +234,19 @@ impl Deco {
     pub fn transform_configure(&self, width: i32, height: i32) -> (i32, i32) {
         (
             width - self.border_size * 2,
-            height - self.top_size - self.border_size,
+            height - self.top_size() - self.border_size,
         )
     }
 
     pub fn transform_size(&self, width: i32, height: i32) -> (i32, i32) {
         (
             width + self.border_size * 2,
-            height + self.top_size + self.border_size,
+            height + self.top_size() + self.border_size,
         )
     }
 
     pub fn transform_anchor(&self, x: i32, y: i32) -> (i32, i32) {
-        (x + self.border_size, y + self.top_size)
+        (x + self.border_size, y + self.top_size())
     }
 
     fn draw(&self) -> eyre::Result<()> {
@@ -273,13 +286,13 @@ impl Deco {
         self.wl_surface.send_damage_buffer(0, 0, width, height);
         let input_region = self.globals.wl_compositor.new_send_create_region();
         input_region.set_forward_to_client(false);
-        input_region.send_add(0, 0, width, self.top_size);
+        input_region.send_add(0, 0, width, self.top_size());
         input_region.send_add(0, 0, self.border_size, height);
         input_region.send_add(width - self.border_size, 0, self.border_size, height);
         input_region.send_add(0, height - self.border_size, width, self.border_size);
         self.wl_surface.send_set_input_region(Some(&input_region));
         self.subsurface
-            .send_set_position(bounds.x - self.border_size, bounds.y - self.top_size);
+            .send_set_position(bounds.x - self.border_size, bounds.y - self.top_size());
         self.wl_surface.send_commit();
         // let _ = self.globals.wl_display.new_send_sync();
         Ok(())
diff --git a/src/main.rs b/src/main.rs
index 609dbb6..99fdb97 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -3,13 +3,16 @@ use std::{process::Command, rc::Rc, sync::OnceLock};
 use clap::{CommandFactory, Parser};
 use wl_proxy::{
     baseline::Baseline,
+    global_mapper::GlobalMapper,
     object::{ConcreteObject, Object, ObjectCoreApi, ObjectRcUtils},
     protocols::{
+        ObjectInterface,
         linux_dmabuf_v1::zwp_linux_dmabuf_v1::ZwpLinuxDmabufV1,
         wayland::{
             wl_registry::{WlRegistry, WlRegistryHandler},
             wl_shm::WlShm,
         },
+        xdg_decoration_unstable_v1::zxdg_decoration_manager_v1::ZxdgDecorationManagerV1,
         xdg_shell::xdg_wm_base::XdgWmBase,
     },
     simple::{SimpleCommandExt, SimpleProxy},
@@ -27,12 +30,16 @@ mod xdg;
 
 struct ClientWlRegistry {
     globals: Rc<Globals>,
+    globals_requested: bool,
+    mapper: GlobalMapper,
 }
 
 impl ClientWlRegistry {
     fn new(globals: &Rc<Globals>) -> Self {
         Self {
             globals: globals.clone(),
+            globals_requested: false,
+            mapper: GlobalMapper::default(),
         }
     }
 }
@@ -45,6 +52,12 @@ impl WlRegistryHandler for ClientWlRegistry {
                 .set_handler(xdg::ClientXdgWmBase {
                     globals: self.globals.clone(),
                 }),
+            ZxdgDecorationManagerV1::INTERFACE => {
+                id.set_forward_to_server(false);
+                id.downcast::<ZxdgDecorationManagerV1>()
+                    .set_handler(xdg::ClientZxdgDecorationManagerV1);
+                return;
+            }
             WlShm::INTERFACE => id
                 .downcast::<WlShm>()
                 .set_handler(client_buffer::ClientWlShm),
@@ -53,7 +66,34 @@ impl WlRegistryHandler for ClientWlRegistry {
                 .set_handler(client_buffer::ClientZwpLinuxDmabufV1),
             _ => {}
         }
-        slf.send_bind(name, id);
+        self.mapper.forward_bind(slf, name, &id);
+    }
+
+    fn handle_global(
+        &mut self,
+        slf: &Rc<WlRegistry>,
+        name: u32,
+        interface: ObjectInterface,
+        version: u32,
+    ) {
+        use ObjectInterface::*;
+        if !self.globals_requested {
+            self.globals_requested = true;
+            self.mapper
+                .add_synthetic_global(slf, ZxdgDecorationManagerV1, 1);
+        }
+        match interface {
+            ZxdgDecorationManagerV1 | WpSecurityContextManagerV1 => {
+                self.mapper.ignore_global(name);
+            }
+            _ => {
+                self.mapper.forward_global(slf, name, interface, version);
+            }
+        }
+    }
+
+    fn handle_global_remove(&mut self, slf: &Rc<WlRegistry>, name: u32) {
+        self.mapper.forward_global_remove(slf, name);
     }
 }
 
diff --git a/src/xdg.rs b/src/xdg.rs
index 155b0d2..75c7f10 100644
--- a/src/xdg.rs
+++ b/src/xdg.rs
@@ -1,13 +1,20 @@
 use std::rc::Rc;
 
 use wl_proxy::{
-    object::ObjectUtils,
+    object::{ObjectCoreApi, ObjectUtils},
     protocols::{
         wayland::{
             wl_buffer::WlBuffer,
             wl_output::{WlOutput, WlOutputTransform},
             wl_surface::{WlSurface, WlSurfaceHandler},
         },
+        xdg_decoration_unstable_v1::{
+            zxdg_decoration_manager_v1::{ZxdgDecorationManagerV1, ZxdgDecorationManagerV1Handler},
+            zxdg_toplevel_decoration_v1::{
+                ZxdgToplevelDecorationV1, ZxdgToplevelDecorationV1Handler,
+                ZxdgToplevelDecorationV1Mode,
+            },
+        },
         xdg_shell::{
             xdg_popup::XdgPopup,
             xdg_positioner::{XdgPositioner, XdgPositionerHandler},
@@ -90,6 +97,54 @@ impl WlSurfaceHandler for ClientWlSurface {
     }
 }
 
+pub struct ClientZxdgDecorationManagerV1;
+
+impl ZxdgDecorationManagerV1Handler for ClientZxdgDecorationManagerV1 {
+    fn handle_destroy(&mut self, slf: &Rc<ZxdgDecorationManagerV1>) {
+        slf.delete_id();
+    }
+
+    fn handle_get_toplevel_decoration(
+        &mut self,
+        _slf: &Rc<ZxdgDecorationManagerV1>,
+        id: &Rc<ZxdgToplevelDecorationV1>,
+        toplevel: &Rc<XdgToplevel>,
+    ) {
+        id.set_handler(ClientZxdgToplevelDecorationV1 {
+            toplevel: toplevel.clone(),
+        });
+        // TODO: send_configure here if a force mode is picked
+    }
+}
+
+pub struct ClientZxdgToplevelDecorationV1 {
+    toplevel: Rc<XdgToplevel>,
+}
+
+impl ZxdgToplevelDecorationV1Handler for ClientZxdgToplevelDecorationV1 {
+    fn handle_destroy(&mut self, slf: &Rc<ZxdgToplevelDecorationV1>) {
+        slf.delete_id();
+    }
+
+    fn handle_set_mode(
+        &mut self,
+        slf: &Rc<ZxdgToplevelDecorationV1>,
+        mode: ZxdgToplevelDecorationV1Mode,
+    ) {
+        let toplevel_handler = self.toplevel.get_handler_ref::<ClientXdgToplevel>();
+        toplevel_handler
+            .deco
+            .set_prefers_ssd(mode == ZxdgToplevelDecorationV1Mode::SERVER_SIDE);
+        slf.send_configure(mode);
+    }
+
+    fn handle_unset_mode(&mut self, slf: &Rc<ZxdgToplevelDecorationV1>) {
+        let toplevel_handler = self.toplevel.get_handler_ref::<ClientXdgToplevel>();
+        toplevel_handler.deco.set_prefers_ssd(false);
+        slf.send_configure(ZxdgToplevelDecorationV1Mode::CLIENT_SIDE);
+    }
+}
+
 pub struct ClientXdgWmBase {
     pub globals: Rc<Globals>,
 }