Implement window closing animations

niri-visual-tests/src/test_window.rs

@@ -2,9 +2,11 @@ use std::cell::RefCell;
 use std::cmp::{max, min};
 use std::rc::Rc;
 
-use niri::layout::{LayoutElement, LayoutElementRenderElement};
+use niri::layout::{
+    LayoutElement, LayoutElementRenderElement, LayoutElementSnapshotRenderElements,
+};
 use niri::render_helpers::renderer::NiriRenderer;
-use niri::render_helpers::RenderTarget;
+use niri::render_helpers::{RenderSnapshot, RenderTarget};
 use niri::window::ResolvedWindowRules;
 use smithay::backend::renderer::element::solid::{SolidColorBuffer, SolidColorRenderElement};
 use smithay::backend::renderer::element::{Id, Kind};
@@ -173,6 +175,10 @@ impl LayoutElement for TestWindow {
         ]
     }
 
+    fn take_last_render(&self) -> RenderSnapshot<LayoutElementSnapshotRenderElements> {
+        RenderSnapshot::default()
+    }
+
     fn request_size(&self, size: Size<i32, Logical>) {
         self.inner.borrow_mut().requested_size = Some(size);
         self.inner.borrow_mut().pending_fullscreen = false;