winit/wayland: Apply scale when creating drag surface

winit/src/platform_specific/mod.rs

@@ -151,14 +151,15 @@ impl PlatformSpecific {
         surface: &dyn HasWindowHandle,
         width: u32,
         height: u32,
+        scale: f64,
         data: &[u8],
         offset: Vector,
     ) {
         #[cfg(all(feature = "wayland", target_os = "linux"))]
         {
-            return self
-                .wayland
-                .update_surface_shm(surface, width, height, data, offset);
+            return self.wayland.update_surface_shm(
+                surface, width, height, scale, data, offset,
+            );
         }
     }
 }

winit/src/platform_specific/wayland/mod.rs

@@ -261,8 +261,9 @@ impl WaylandSpecific {
                 let surface =
                     WlSurface::from_id(self.conn.as_ref().unwrap(), id)
                         .unwrap();
-                subsurface_state
-                    .update_surface_shm(&surface, width, height, data, offset);
+                subsurface_state.update_surface_shm(
+                    &surface, width, height, scale, data, offset,
+                );
             }
         }
     }

winit/src/platform_specific/wayland/subsurface_widget.rs

@@ -378,9 +378,15 @@ impl SubsurfaceState {
         surface: &WlSurface,
         width: u32,
         height: u32,
+        scale: f64,
         data: &[u8],
         offset: Vector,
     ) {
+        let wp_viewport = self.wp_viewporter.get_viewport(
+            &surface,
+            &self.qh,
+            cctk::sctk::globals::GlobalData,
+        );
         let shm = ShmGlobal(&self.wl_shm);
         let mut pool =
             SlotPool::new(width as usize * height as usize * 4, &shm).unwrap();
@@ -396,7 +402,12 @@ impl SubsurfaceState {
         surface.damage_buffer(0, 0, width as i32, height as i32);
         buffer.attach_to(&surface);
         surface.offset(offset.x as i32, offset.y as i32);
+        wp_viewport.set_destination(
+            (width as f64 / scale) as i32,
+            (height as f64 / scale) as i32,
+        );
         surface.commit();
+        wp_viewport.destroy();
     }
 
     fn create_subsurface(&self, parent: &WlSurface) -> SubsurfaceInstance {