Run Iris examples on desktop and Android

examples/bench_images/desktop.rs

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+use iris::prelude::*;
+use winit::event::WindowEvent;
+
+#[path = "lib.rs"]
+mod app;
+use app::*;
+
+const SETTLE_FRAMES: usize = 4;
+const FRAMES: usize = 6;
+
+#[derive(DesktopUiState)]
+struct State {
+    ui_state: DesktopUiState,
+    span: WeakWidget<Span>,
+    frame: usize,
+    appended: bool,
+}
+
+impl DesktopAppState for State {
+    fn new(mut ui_state: DesktopUiState, rsc: &mut StdRsc<Self>, _: Proxy<Self::Event>) -> Self {
+        let span = build(rsc, &mut ui_state);
+        Self {
+            ui_state,
+            span,
+            frame: 0,
+            appended: false,
+        }
+    }
+
+    fn window_event(&mut self, event: WindowEvent, rsc: &mut StdRsc<Self>) {
+        if !matches!(event, WindowEvent::RedrawRequested) {
+            return;
+        }
+        self.frame += 1;
+        let creates = self.ui_state.renderer.ui.take_image_bind_group_creates();
+        println!(
+            "BENCH_IMAGES frame={} bind_group_creates={creates}",
+            self.frame
+        );
+        if self.frame == SETTLE_FRAMES && !self.appended {
+            self.appended = true;
+            let img = iris::image::DynamicImage::new_rgba8(32, 32);
+            let widget = image::<StdRsc<Self>>(img)(rsc);
+            let widget = rsc.ui.widgets.add_strong(widget);
+            rsc.ui
+                .widgets
+                .get_mut(&self.span)
+                .unwrap()
+                .push(widget.any());
+            println!("BENCH_IMAGES appended one image after settling");
+        }
+        if self.frame < FRAMES {
+            self.ui_state.window.request_redraw();
+        } else {
+            std::process::exit(0);
+        }
+    }
+}
+
+fn main() {
+    DesktopApp::<State>::run();
+}