Provide `compatible_surface` in `iced_wgpu::Compositor`

graphics/src/window/compositor.rs

@@ -17,7 +17,10 @@ pub trait Compositor: Sized {
     type SwapChain;
 
     /// Creates a new [`Compositor`].
-    fn new(settings: Self::Settings) -> Result<(Self, Self::Renderer), Error>;
+    fn new<W: HasRawWindowHandle>(
+        settings: Self::Settings,
+        compatible_window: Option<&W>,
+    ) -> Result<(Self, Self::Renderer), Error>;
 
     /// Crates a new [`Surface`] for the given window.
     ///

rustfmt.toml

@@ -1 +1,2 @@
 max_width=80
+edition="2018"

wgpu/src/window/compositor.rs

@@ -21,9 +21,16 @@ impl Compositor {
     /// Requests a new [`Compositor`] with the given [`Settings`].
     ///
     /// Returns `None` if no compatible graphics adapter could be found.
-    pub async fn request(settings: Settings) -> Option<Self> {
+    pub async fn request<W: HasRawWindowHandle>(
+        settings: Settings,
+        compatible_window: Option<&W>,
+    ) -> Option<Self> {
         let instance = wgpu::Instance::new(settings.internal_backend);
 
+        #[allow(unsafe_code)]
+        let compatible_surface = compatible_window
+            .map(|window| unsafe { instance.create_surface(window) });
+
         let adapter = instance
             .request_adapter(&wgpu::RequestAdapterOptions {
                 power_preference: if settings.antialiasing.is_none() {
@@ -31,7 +38,7 @@ impl Compositor {
                 } else {
                     wgpu::PowerPreference::HighPerformance
                 },
-                compatible_surface: None,
+                compatible_surface: compatible_surface.as_ref(),
             })
             .await?;
 
@@ -77,8 +84,14 @@ impl iced_graphics::window::Compositor for Compositor {
     type Surface = wgpu::Surface;
     type SwapChain = wgpu::SwapChain;
 
-    fn new(settings: Self::Settings) -> Result<(Self, Renderer), Error> {
-        let compositor = futures::executor::block_on(Self::request(settings))
+    fn new<W: HasRawWindowHandle>(
+        settings: Self::Settings,
+        compatible_window: Option<&W>,
+    ) -> Result<(Self, Renderer), Error> {
+        let compositor = futures::executor::block_on(Self::request(
+            settings,
+            compatible_window,
+        ))
         .ok_or(Error::AdapterNotFound)?;
 
         let backend = compositor.create_backend();

winit/src/application.rs

@@ -118,8 +118,6 @@ where
     let mut debug = Debug::new();
     debug.startup_started();
 
-    let (compositor, renderer) = C::new(compositor_settings)?;
-
     let event_loop = EventLoop::with_user_event();
 
     let mut runtime = {
@@ -150,6 +148,8 @@ where
         .build(&event_loop)
         .map_err(Error::WindowCreationFailed)?;
 
+    let (compositor, renderer) = C::new(compositor_settings, Some(&window))?;
+
     let (mut sender, receiver) = mpsc::unbounded();
 
     let mut instance = Box::pin(run_instance::<A, E, C>(