Remove Vec from Shadow::render()

src/layout/mod.rs

@@ -3994,12 +3994,12 @@ impl<W: LayoutElement> Layout<W> {
         }
     }
 
-    pub fn render_floating_for_output<R: NiriRenderer>(
-        &self,
+    pub fn render_floating_for_output<'a, R: NiriRenderer + 'a>(
+        &'a self,
         renderer: &mut R,
         output: &Output,
         target: RenderTarget,
-    ) -> impl Iterator<Item = TileRenderElement<R>> {
+    ) -> impl Iterator<Item = TileRenderElement<R>> + 'a {
         if self.update_render_elements_time != self.clock.now() {
             error!("clock moved between updating render elements and rendering");
         }

src/layout/shadow.rs

@@ -157,26 +157,19 @@ impl Shadow {
         &self,
         renderer: &mut impl NiriRenderer,
         location: Point<f64, Logical>,
-    ) -> impl Iterator<Item = ShadowRenderElement> {
-        let mut rv = Vec::new();
-
+    ) -> impl Iterator<Item = ShadowRenderElement> + '_ {
         if !self.config.on {
-            return rv.into_iter();
+            return None.into_iter().flatten();
         }
 
         let has_shadow_shader = ShadowRenderElement::has_shader(renderer);
         if !has_shadow_shader {
-            return rv.into_iter();
+            return None.into_iter().flatten();
         }
 
-        let mut push = |shader: &ShadowRenderElement, location: Point<f64, Logical>| {
-            rv.push(shader.clone().with_location(location));
-        };
+        let rv = zip(&self.shaders, &self.shader_rects)
+            .map(move |(shader, rect)| shader.clone().with_location(location + rect.loc));
 
-        for (shader, rect) in zip(&self.shaders, &self.shader_rects) {
-            push(shader, location + rect.loc);
-        }
-
-        rv.into_iter()
+        Some(rv).into_iter().flatten()
     }
 }

src/layout/tile.rs

@@ -710,14 +710,14 @@ impl<W: LayoutElement> Tile<W> {
             .unwrap_or_else(|| !self.window.has_ssd())
     }
 
-    fn render_inner<R: NiriRenderer>(
-        &self,
+    fn render_inner<'a, R: NiriRenderer + 'a>(
+        &'a self,
         renderer: &mut R,
         location: Point<f64, Logical>,
         scale: Scale<f64>,
         focus_ring: bool,
         target: RenderTarget,
-    ) -> impl Iterator<Item = TileRenderElement<R>> {
+    ) -> impl Iterator<Item = TileRenderElement<R>> + 'a {
         let _span = tracy_client::span!("Tile::render_inner");
 
         let alpha = if self.is_fullscreen {
@@ -926,14 +926,14 @@ impl<W: LayoutElement> Tile<W> {
         rv.chain(self.shadow.render(renderer, location).map(Into::into))
     }
 
-    pub fn render<R: NiriRenderer>(
-        &self,
+    pub fn render<'a, R: NiriRenderer + 'a>(
+        &'a self,
         renderer: &mut R,
         location: Point<f64, Logical>,
         scale: Scale<f64>,
         focus_ring: bool,
         target: RenderTarget,
-    ) -> impl Iterator<Item = TileRenderElement<R>> {
+    ) -> impl Iterator<Item = TileRenderElement<R>> + 'a {
         let _span = tracy_client::span!("Tile::render");
 
         let mut open_anim_elem = None;