wip: apply scale to lock surface

sctk/src/application.rs

@@ -810,6 +810,7 @@ where
                             }
 
                             state.set_logical_size(configure.new_size.0 as f32 , configure.new_size.1 as f32);
+                            state.frame_pending = false;
                         }
 
                     }
@@ -824,6 +825,18 @@ where
                             destroyed_surface_ids.insert(surface.id(), surface_id);
                         }
                     }
+                    SctkEvent::SessionLockSurfaceScaleFactorChanged { surface, scale_factor, viewport } => {
+                        if let Some(state) = surface_ids
+                            .get(&surface.id())
+                            .and_then(|id| states.get_mut(&id.inner()))
+                        {
+                            // XXX we need to wait for the next configure event to redraw
+                            state.frame_pending = true;
+
+                            state.wp_viewport = viewport;
+                            state.set_scale_factor(scale_factor);
+                        }
+                    }
                     _ => {}
                 }
             }
@@ -2365,6 +2378,9 @@ where
         SctkEvent::SessionLockSurfaceDone { surface } => {
             &surface.id() == object_id
         }
+        SctkEvent::SessionLockSurfaceScaleFactorChanged { surface, .. } => {
+            &surface.id() == object_id
+        }
         SctkEvent::SessionUnlocked => false,
     }
 }

sctk/src/event_loop/mod.rs

@@ -516,6 +516,9 @@ where
                     | SctkEvent::WindowEvent {
                         variant: WindowEventVariant::ScaleFactorChanged(..),
                         ..
+                    }
+                    | SctkEvent::SessionLockSurfaceScaleFactorChanged {
+                        ..
                     } => true,
                     // ignore other events that shouldn't be in this buffer
                     event => {

sctk/src/event_loop/state.rs

@@ -8,7 +8,7 @@ use crate::{
     application::Event,
     dpi::LogicalSize,
     handlers::{
-        wp_fractional_scaling::FractionalScalingManager,
+        shell::layer, wp_fractional_scaling::FractionalScalingManager,
         wp_viewporter::ViewporterState,
     },
     sctk_event::{
@@ -240,6 +240,9 @@ pub struct SctkLockSurface {
     pub(crate) id: window::Id,
     pub(crate) session_lock_surface: SessionLockSurface,
     pub(crate) last_configure: Option<SessionLockSurfaceConfigure>,
+    pub(crate) scale_factor: Option<f64>,
+    pub(crate) wp_fractional_scale: Option<WpFractionalScaleV1>,
+    pub(crate) wp_viewport: Option<WpViewport>,
 }
 
 pub struct Dnd<T> {
@@ -460,6 +463,27 @@ impl<T> SctkState<T> {
             });
         }
 
+        if let Some(l) = self
+            .lock_surfaces
+            .iter_mut()
+            .find(|l| l.session_lock_surface.wl_surface() == surface)
+        {
+            if legacy && self.fractional_scaling_manager.is_some() {
+                return;
+            }
+            l.scale_factor = Some(scale_factor);
+            let wl_surface = l.session_lock_surface.wl_surface();
+            if legacy {
+                let _ = wl_surface.set_buffer_scale(scale_factor as i32);
+            }
+            self.compositor_updates.push(
+                SctkEvent::SessionLockSurfaceScaleFactorChanged {
+                    surface: wl_surface.clone(),
+                    scale_factor,
+                    viewport: l.wp_viewport.clone(),
+                },
+            );
+        }
         // TODO winit sets cursor size after handling the change for the window, so maybe that should be done as well.
     }
 }
@@ -864,10 +888,26 @@ where
                 output,
                 &self.queue_handle,
             );
+            let wp_viewport = self.viewporter_state.as_ref().map(|state| {
+                state.get_viewport(
+                    session_lock_surface.wl_surface(),
+                    &self.queue_handle,
+                )
+            });
+            let wp_fractional_scale =
+                self.fractional_scaling_manager.as_ref().map(|fsm| {
+                    fsm.fractional_scaling(
+                        session_lock_surface.wl_surface(),
+                        &self.queue_handle,
+                    )
+                });
             self.lock_surfaces.push(SctkLockSurface {
                 id,
                 session_lock_surface,
                 last_configure: None,
+                wp_viewport,
+                wp_fractional_scale,
+                scale_factor: None,
             });
             Some(wl_surface)
         } else {

sctk/src/sctk_event.rs

@@ -215,6 +215,11 @@ pub enum SctkEvent {
     SessionLockSurfaceDone {
         surface: WlSurface,
     },
+    SessionLockSurfaceScaleFactorChanged {
+        surface: WlSurface,
+        scale_factor: f64,
+        viewport: Option<WpViewport>,
+    },
     SessionUnlocked,
 }
 
@@ -988,6 +993,7 @@ impl SctkEvent {
                 .into_iter()
                 .collect()
             }
+            SctkEvent::SessionLockSurfaceScaleFactorChanged { .. } => vec![],
         }
     }
 }