xdg-toplevel: center fullscreen surfaces with geometry smaller than output

src/ifs/wl_surface.rs

@@ -301,6 +301,7 @@ pub struct WlSurface {
     pub extents: Cell<Rect>,
     pub buffer_abs_pos: Cell<Rect>,
     pub need_extents_update: Cell<bool>,
+    need_extents_propagation: Cell<bool>,
     pub buffer: CloneCell<Option<Rc<SurfaceBuffer>>>,
     pub shm_staging: CloneCell<Option<Rc<dyn GfxStagingBuffer>>>,
     pub shm_textures: DoubleBuffered<SurfaceShmTexture>,
@@ -650,6 +651,7 @@ impl WlSurface {
             extents: Default::default(),
             buffer_abs_pos: Cell::new(Default::default()),
             need_extents_update: Default::default(),
+            need_extents_propagation: Default::default(),
             buffer: Default::default(),
             shm_staging: Default::default(),
             shm_textures: DoubleBuffered::new(DamageQueue::new().map(|damage| SurfaceShmTexture {
@@ -904,7 +906,7 @@ impl WlSurface {
         self.ext.set(self.client.state.none_surface_ext.clone());
     }
 
-    fn calculate_extents(&self) {
+    fn calculate_extents(&self, propagate: bool) {
         let old_extents = self.extents.get();
         let mut extents = self.buffer_abs_pos.get().at_point(0, 0);
         let children = self.children.borrow();
@@ -925,7 +927,11 @@ impl WlSurface {
         self.extents.set(extents);
         self.need_extents_update.set(false);
         if old_extents != extents {
-            self.ext.get().extents_changed()
+            if propagate {
+                self.ext.get().extents_changed()
+            } else {
+                self.need_extents_propagation.set(true);
+            }
         }
     }
 
@@ -1398,7 +1404,7 @@ impl WlSurface {
                 .push(XWaylandEvent::SurfaceSerialAssigned(self.id));
         }
         if self.need_extents_update.get() {
-            self.calculate_extents();
+            self.calculate_extents(false);
         }
         if buffer_changed || transform_changed || alpha_changed {
             for (_, cursor) in &self.cursors {
@@ -1461,6 +1467,9 @@ impl WlSurface {
         {
             self.output.get().update_presentation_type();
         }
+        if self.need_extents_propagation.take() {
+            self.ext.get().extents_changed();
+        }
         self.commit_version.fetch_add(1);
         Ok(())
     }

src/ifs/wl_surface/wl_subsurface.rs

@@ -308,7 +308,7 @@ impl WlSubsurfaceRequestHandler for WlSubsurface {
                 if !parent.need_extents_update.get() {
                     break;
                 }
-                parent.calculate_extents();
+                parent.calculate_extents(true);
                 parent_opt = parent.ext.get().subsurface_parent();
             }
         }

src/ifs/wl_surface/xdg_surface.rs

@@ -24,6 +24,7 @@ use {
             WorkspaceNode,
         },
         utils::{
+            cell_ext::CellExt,
             clonecell::CloneCell,
             copyhashmap::CopyHashMap,
             hash_map_ext::HashMapExt,
@@ -90,6 +91,7 @@ pub struct XdgSurface {
     acked_serial: Cell<Option<u32>>,
     geometry: Cell<Option<Rect>>,
     extents: Cell<Rect>,
+    effective_geometry: Cell<Rect>,
     pub absolute_desired_extents: Cell<Rect>,
     ext: CloneCell<Option<Rc<dyn XdgSurfaceExt>>>,
     popup_display_stack: CloneCell<Rc<LinkedList<Rc<dyn StackedNode>>>>,
@@ -231,6 +233,10 @@ pub trait XdgSurfaceExt: Debug {
         None
     }
 
+    fn effective_geometry(&self, geometry: Rect) -> Rect {
+        geometry
+    }
+
     fn make_visible(self: Rc<Self>);
 
     fn node_layer(&self) -> NodeLayerLink;
@@ -247,6 +253,7 @@ impl XdgSurface {
             acked_serial: Cell::new(None),
             geometry: Cell::new(None),
             extents: Cell::new(surface.extents.get()),
+            effective_geometry: Default::default(),
             absolute_desired_extents: Cell::new(Default::default()),
             ext: Default::default(),
             popup_display_stack: CloneCell::new(surface.client.state.root.stacked.clone()),
@@ -262,10 +269,9 @@ impl XdgSurface {
 
     fn update_surface_position(&self) {
         let (mut x1, mut y1) = self.absolute_desired_extents.get().position();
-        if let Some(geo) = self.geometry.get() {
+        let geo = self.effective_geometry.get();
-            x1 -= geo.x1();
+        x1 -= geo.x1();
-            y1 -= geo.y1();
+        y1 -= geo.y1();
-        }
         self.surface.set_absolute_position(x1, y1);
         self.update_popup_positions();
     }
@@ -336,8 +342,8 @@ impl XdgSurface {
         self.surface.client.state.damage(extents.move_(x, y));
     }
 
-    pub fn geometry(&self) -> Option<Rect> {
+    pub fn geometry(&self) -> Rect {
-        self.geometry.get()
+        self.effective_geometry.get()
     }
 
     pub fn schedule_configure(self: &Rc<Self>) {
@@ -512,6 +518,24 @@ impl XdgSurfaceRequestHandler for XdgSurface {
 }
 
 impl XdgSurface {
+    fn update_effective_geometry(&self) {
+        let geometry = self
+            .geometry
+            .get()
+            .unwrap_or_else(|| self.surface.extents.get());
+        let mut effective_geometry = geometry;
+        let ext = self.ext.get();
+        if let Some(ext) = &ext {
+            effective_geometry = ext.effective_geometry(geometry);
+        }
+        if self.effective_geometry.replace(effective_geometry) != effective_geometry {
+            self.update_surface_position();
+            if let Some(ext) = &ext {
+                ext.geometry_changed();
+            }
+        }
+    }
+
     fn update_extents(&self) {
         let old_extents = self.extents.get();
         let mut new_extents = self.surface.extents.get();
@@ -519,19 +543,19 @@ impl XdgSurface {
             new_extents = new_extents.intersect(geometry);
         }
         self.extents.set(new_extents);
-        if old_extents != new_extents
+        if old_extents != new_extents {
-            && let Some(ext) = self.ext.get()
+            if self.geometry.is_none() {
-        {
+                self.update_effective_geometry();
-            ext.extents_changed();
+            }
+            if let Some(ext) = self.ext.get() {
+                ext.extents_changed();
+            }
         }
     }
 
     fn find_tree_at(&self, mut x: i32, mut y: i32, tree: &mut Vec<FoundNode>) -> FindTreeResult {
-        if let Some(geo) = self.geometry.get() {
+        let geo = self.effective_geometry.get();
-            let (xt, yt) = geo.translate_inv(x, y);
+        (x, y) = geo.translate_inv(x, y);
-            x = xt;
-            y = yt;
-        }
         self.surface.find_tree_at_(x, y, tree)
     }
 
@@ -604,11 +628,8 @@ impl SurfaceExt for XdgSurface {
         {
             let prev = self.geometry.replace(Some(geometry));
             if prev != Some(geometry) {
+                self.update_effective_geometry();
                 self.update_extents();
-                self.update_surface_position();
-                if let Some(ext) = self.ext.get() {
-                    ext.geometry_changed();
-                }
             }
         }
         Ok(())

src/ifs/wl_surface/xdg_surface/xdg_toplevel.rs

@@ -746,6 +746,10 @@ impl ToplevelNodeBase for XdgToplevel {
     ) -> Option<TileDragDestination> {
         default_tile_drag_destination(self, source, split, abs_bounds, x, y)
     }
+
+    fn tl_mark_fullscreen_ext(&self) {
+        self.xdg.update_effective_geometry();
+    }
 }
 
 impl XdgSurfaceExt for XdgToplevel {
@@ -776,6 +780,23 @@ impl XdgSurfaceExt for XdgToplevel {
             .damage(self.node_absolute_position());
     }
 
+    fn effective_geometry(&self, geometry: Rect) -> Rect {
+        if !self.toplevel_data.is_fullscreen.get() {
+            return geometry;
+        }
+        let output = self
+            .toplevel_data
+            .output()
+            .node_absolute_position()
+            .at_point(0, 0);
+        let x_overflow = output.width() - geometry.width();
+        let y_overflow = output.height() - geometry.height();
+        output.at_point(
+            geometry.x1() - x_overflow / 2,
+            geometry.y1() - y_overflow / 2,
+        )
+    }
+
     fn make_visible(self: Rc<Self>) {
         self.node_make_visible();
     }

src/renderer.rs

@@ -338,9 +338,8 @@ impl Renderer<'_> {
         bounds: Option<&Rect>,
     ) {
         let surface = &xdg.surface;
-        if let Some(geo) = xdg.geometry() {
+        let geo = xdg.geometry();
-            (x, y) = geo.translate(x, y);
+        (x, y) = geo.translate(x, y);
-        }
         self.render_surface(surface, x, y, bounds);
     }
 

src/tree/toplevel.rs

@@ -247,6 +247,7 @@ impl<T: ToplevelNodeBase> ToplevelNode for T {
     fn tl_mark_fullscreen(&self, fullscreen: bool) {
         self.tl_data().is_fullscreen.set(fullscreen);
         self.tl_mark_ancestor_fullscreen(fullscreen);
+        self.tl_mark_fullscreen_ext();
     }
 }
 
@@ -315,6 +316,10 @@ pub trait ToplevelNodeBase: Node {
     fn tl_mark_ancestor_fullscreen_ext(&self, fullscreen: bool) {
         let _ = fullscreen;
     }
+
+    fn tl_mark_fullscreen_ext(&self) {
+        // nothing
+    }
 }
 
 pub struct FullscreenedData {