4 files changed, 32 insertions, 7 deletions
diff --git a/native/src/lib.rs b/native/src/lib.rs
index fa72a553..86bfb3ca 100644
--- a/native/src/lib.rs
+++ b/native/src/lib.rs
@@ -206,6 +206,7 @@ mod element;
 mod event;
 mod hasher;
 mod layout;
+mod metrics;
 mod mouse_cursor;
 mod node;
 mod style;
@@ -224,6 +225,7 @@ pub use element::Element;
 pub use event::Event;
 pub use hasher::Hasher;
 pub use layout::Layout;
+pub use metrics::Metrics;
 pub use mouse_cursor::MouseCursor;
 pub use node::Node;
 pub use renderer::Renderer;
diff --git a/native/src/metrics.rs b/native/src/metrics.rs
new file mode 100644
index 00000000..7c344b9b
--- /dev/null
+++ b/native/src/metrics.rs
@@ -0,0 +1,11 @@
+use std::time;
+
+/// A bunch of metrics about an Iced application.
+#[derive(Debug, Clone, Copy)]
+pub struct Metrics {
+    pub startup_time: time::Duration,
+    pub update_time: time::Duration,
+    pub view_time: time::Duration,
+    pub renderer_output_time: time::Duration,
+    pub message_count: usize,
+}
diff --git a/native/src/renderer.rs b/native/src/renderer.rs
index afe1b09a..5963d577 100644
--- a/native/src/renderer.rs
+++ b/native/src/renderer.rs
@@ -24,7 +24,7 @@ mod debugger;
 mod windowed;
 
 pub use debugger::Debugger;
-pub use windowed::Windowed;
+pub use windowed::{Target, Windowed};
 
 pub trait Renderer {
     type Output;
diff --git a/native/src/renderer/windowed.rs b/native/src/renderer/windowed.rs
index bcf37964..0499ca70 100644
--- a/native/src/renderer/windowed.rs
+++ b/native/src/renderer/windowed.rs
@@ -1,17 +1,29 @@
-use crate::MouseCursor;
+use crate::{Metrics, MouseCursor};
 
 use raw_window_handle::HasRawWindowHandle;
 
-pub trait Windowed: super::Renderer {
-    type Target;
+pub trait Windowed: super::Renderer + Sized {
+    type Target: Target<Renderer = Self>;
 
-    fn new<W: HasRawWindowHandle>(window: &W) -> Self;
-
-    fn target(&self, width: u16, height: u16) -> Self::Target;
+    fn new() -> Self;
 
     fn draw(
         &mut self,
         output: &Self::Output,
+        metrics: Option<Metrics>,
         target: &mut Self::Target,
     ) -> MouseCursor;
 }
+
+pub trait Target {
+    type Renderer;
+
+    fn new<W: HasRawWindowHandle>(
+        window: &W,
+        width: u16,
+        height: u16,
+        renderer: &Self::Renderer,
+    ) -> Self;
+
+    fn resize(&mut self, width: u16, height: u16, renderer: &Self::Renderer);
+}