Make compatible_window mandatory in Compositor

graphics/src/compositor.rs

@@ -22,7 +22,7 @@ pub trait Compositor: Sized {
     /// Creates a new [`Compositor`].
     fn new<W: Window + Clone>(
         settings: Self::Settings,
-        compatible_window: Option<W>,
+        compatible_window: W,
     ) -> Result<Self, Error>;
 
     /// Creates a [`Self::Renderer`] for the [`Compositor`].

renderer/src/compositor.rs

@@ -24,7 +24,7 @@ impl<Theme> crate::graphics::Compositor for Compositor<Theme> {
 
     fn new<W: Window + Clone>(
         settings: Self::Settings,
-        compatible_window: Option<W>,
+        compatible_window: W,
     ) -> Result<Self, Error> {
         let candidates =
             Candidate::list_from_env().unwrap_or(Candidate::default_list());
@@ -228,7 +228,7 @@ impl Candidate {
     fn build<Theme, W: Window>(
         self,
         settings: Settings,
-        _compatible_window: Option<W>,
+        _compatible_window: W,
     ) -> Result<Compositor<Theme>, Error> {
         match self {
             Self::TinySkia => {

tiny_skia/src/window/compositor.rs

@@ -9,7 +9,7 @@ use std::marker::PhantomData;
 use std::num::NonZeroU32;
 
 pub struct Compositor<Theme> {
-    context: Option<softbuffer::Context<Box<dyn compositor::Window>>>,
+    context: softbuffer::Context<Box<dyn compositor::Window>>,
     settings: Settings,
     _theme: PhantomData<Theme>,
 }
@@ -32,7 +32,7 @@ impl<Theme> crate::graphics::Compositor for Compositor<Theme> {
 
     fn new<W: compositor::Window>(
         settings: Self::Settings,
-        compatible_window: Option<W>,
+        compatible_window: W,
     ) -> Result<Self, Error> {
         Ok(new(settings, compatible_window))
     }
@@ -51,17 +51,11 @@ impl<Theme> crate::graphics::Compositor for Compositor<Theme> {
         width: u32,
         height: u32,
     ) -> Surface {
-        let window = if let Some(context) = self.context.as_ref() {
-            softbuffer::Surface::new(context, Box::new(window.clone()) as _)
-                .expect("Create softbuffer surface for window")
-        } else {
-            let context =
-                softbuffer::Context::new(Box::new(window.clone()) as _)
-                    .expect("Create softbuffer context for window");
-
-            softbuffer::Surface::new(&context, Box::new(window.clone()) as _)
-                .expect("Create softbuffer surface for window")
-        };
+        let window = softbuffer::Surface::new(
+            &self.context,
+            Box::new(window.clone()) as _,
+        )
+        .expect("Create softbuffer surface for window");
 
         Surface {
             window,
@@ -133,11 +127,11 @@ impl<Theme> crate::graphics::Compositor for Compositor<Theme> {
 
 pub fn new<W: compositor::Window, Theme>(
     settings: Settings,
-    compatible_window: Option<W>,
+    compatible_window: W,
 ) -> Compositor<Theme> {
     #[allow(unsafe_code)]
-    let context = compatible_window
-        .and_then(|w| softbuffer::Context::new(Box::new(w) as _).ok());
+    let context = softbuffer::Context::new(Box::new(compatible_window) as _)
+        .expect("Create softbuffer context");
 
     Compositor {
         context,

wgpu/src/window/compositor.rs

@@ -137,11 +137,11 @@ impl<Theme> Compositor<Theme> {
 /// window.
 pub fn new<W: compositor::Window, Theme>(
     settings: Settings,
-    compatible_window: Option<W>,
+    compatible_window: W,
 ) -> Result<Compositor<Theme>, Error> {
     let compositor = futures::executor::block_on(Compositor::request(
         settings,
-        compatible_window,
+        Some(compatible_window),
     ))
     .ok_or(Error::GraphicsAdapterNotFound)?;
 
@@ -210,7 +210,7 @@ impl<Theme> graphics::Compositor for Compositor<Theme> {
 
     fn new<W: compositor::Window>(
         settings: Self::Settings,
-        compatible_window: Option<W>,
+        compatible_window: W,
     ) -> Result<Self, Error> {
         new(settings, compatible_window)
     }

winit/src/application.rs

@@ -187,7 +187,7 @@ where
         };
     }
 
-    let compositor = C::new(compositor_settings, Some(window.clone()))?;
+    let compositor = C::new(compositor_settings, window.clone())?;
     let mut renderer = compositor.create_renderer();
 
     for font in settings.fonts {

winit/src/multi_window.rs

@@ -187,8 +187,7 @@ where
         };
     }
 
-    let mut compositor =
-        C::new(compositor_settings, Some(main_window.clone()))?;
+    let mut compositor = C::new(compositor_settings, main_window.clone())?;
 
     let mut window_manager = WindowManager::new();
     let _ = window_manager.insert(