Allow custom renderers in `Program` and `Application`

19 files changed, 162 insertions, 122 deletions

diff --git a/graphics/src/backend.rs b/graphics/src/backend.rs
index e982b54a..aa7bf4e8 100644
--- a/graphics/src/backend.rs
+++ b/graphics/src/backend.rs
@@ -2,16 +2,16 @@
 use crate::core::image;
 use crate::core::svg;
 use crate::core::Size;
-use crate::Mesh;
+use crate::{Compositor, Mesh, Renderer};
 
 use std::borrow::Cow;
 
 /// The graphics backend of a [`Renderer`].
 ///
 /// [`Renderer`]: crate::Renderer
-pub trait Backend {
+pub trait Backend: Sized {
     /// The compositor of this [`Backend`].
-    type Compositor;
+    type Compositor: Compositor<Renderer = Renderer<Self>>;
 
     /// The custom kind of primitives this [`Backend`] supports.
     type Primitive: TryFrom<Mesh, Error = &'static str>;
diff --git a/graphics/src/compositor.rs b/graphics/src/compositor.rs
index 32cea46a..4d548f30 100644
--- a/graphics/src/compositor.rs
+++ b/graphics/src/compositor.rs
@@ -1,9 +1,9 @@
 //! A compositor is responsible for initializing a renderer and managing window
 //! surfaces.
-use crate::{Error, Viewport};
-
+use crate::core;
 use crate::core::Color;
 use crate::futures::{MaybeSend, MaybeSync};
+use crate::{Error, Settings, Viewport};
 
 use raw_window_handle::{HasDisplayHandle, HasWindowHandle};
 use std::future::Future;
@@ -11,9 +11,6 @@ use thiserror::Error;
 
 /// A graphics compositor that can draw to windows.
 pub trait Compositor: Sized {
-    /// The settings of the backend.
-    type Settings: Default;
-
     /// The iced renderer of the backend.
     type Renderer;
 
@@ -22,7 +19,7 @@ pub trait Compositor: Sized {
 
     /// Creates a new [`Compositor`].
     fn new<W: Window + Clone>(
-        settings: Self::Settings,
+        settings: Settings,
         compatible_window: W,
     ) -> impl Future<Output = Result<Self, Error>>;
 
@@ -93,6 +90,12 @@ impl<T> Window for T where
 {
 }
 
+/// A renderer that supports composition.
+pub trait Renderer: core::Renderer {
+    /// The compositor of the renderer.
+    type Compositor: Compositor<Renderer = Self>;
+}
+
 /// Result of an unsuccessful call to [`Compositor::present`].
 #[derive(Clone, PartialEq, Eq, Debug, Error)]
 pub enum SurfaceError {
@@ -123,13 +126,13 @@ pub struct Information {
     pub backend: String,
 }
 
+#[cfg(debug_assertions)]
 impl Compositor for () {
-    type Settings = ();
     type Renderer = ();
     type Surface = ();
 
     async fn new<W: Window + Clone>(
-        _settings: Self::Settings,
+        _settings: Settings,
         _compatible_window: W,
     ) -> Result<Self, Error> {
         Ok(())
@@ -182,3 +185,8 @@ impl Compositor for () {
         vec![]
     }
 }
+
+#[cfg(debug_assertions)]
+impl Renderer for () {
+    type Compositor = ();
+}
diff --git a/graphics/src/lib.rs b/graphics/src/lib.rs
index a682b89b..2e476f8c 100644
--- a/graphics/src/lib.rs
+++ b/graphics/src/lib.rs
@@ -20,6 +20,7 @@ mod antialiasing;
 mod cached;
 mod error;
 mod primitive;
+mod settings;
 mod viewport;
 
 pub mod backend;
@@ -47,6 +48,7 @@ pub use gradient::Gradient;
 pub use mesh::Mesh;
 pub use primitive::Primitive;
 pub use renderer::Renderer;
+pub use settings::Settings;
 pub use viewport::Viewport;
 
 pub use iced_core as core;
diff --git a/graphics/src/renderer.rs b/graphics/src/renderer.rs
index eb720495..5de7f97f 100644
--- a/graphics/src/renderer.rs
+++ b/graphics/src/renderer.rs
@@ -1,5 +1,6 @@
 //! Create a renderer from a [`Backend`].
 use crate::backend::{self, Backend};
+use crate::compositor;
 use crate::core;
 use crate::core::image;
 use crate::core::renderer;
@@ -259,3 +260,10 @@ where
         self.draw_primitive(geometry);
     }
 }
+
+impl<B> compositor::Renderer for Renderer<B>
+where
+    B: Backend,
+{
+    type Compositor = B::Compositor;
+}
diff --git a/graphics/src/settings.rs b/graphics/src/settings.rs
new file mode 100644
index 00000000..68673536
--- /dev/null
+++ b/graphics/src/settings.rs
@@ -0,0 +1,29 @@
+use crate::core::{Font, Pixels};
+use crate::Antialiasing;
+
+/// The settings of a Backend.
+#[derive(Debug, Clone, Copy, PartialEq)]
+pub struct Settings {
+    /// The default [`Font`] to use.
+    pub default_font: Font,
+
+    /// The default size of text.
+    ///
+    /// By default, it will be set to `16.0`.
+    pub default_text_size: Pixels,
+
+    /// The antialiasing strategy that will be used for triangle primitives.
+    ///
+    /// By default, it is `None`.
+    pub antialiasing: Option<Antialiasing>,
+}
+
+impl Default for Settings {
+    fn default() -> Settings {
+        Settings {
+            default_font: Font::default(),
+            default_text_size: Pixels(16.0),
+            antialiasing: None,
+        }
+    }
+}
diff --git a/renderer/src/fallback.rs b/renderer/src/fallback.rs
index 4431606a..28e73dd8 100644
--- a/renderer/src/fallback.rs
+++ b/renderer/src/fallback.rs
@@ -200,15 +200,12 @@ impl<L, R> graphics::Compositor for Compositor<L, R>
 where
     L: graphics::Compositor,
     R: graphics::Compositor,
-    L::Settings: From<crate::Settings>,
-    R::Settings: From<crate::Settings>,
 {
-    type Settings = crate::Settings;
     type Renderer = Renderer<L::Renderer, R::Renderer>;
     type Surface = Surface<L::Surface, R::Surface>;
 
     async fn new<W: compositor::Window + Clone>(
-        settings: Self::Settings,
+        settings: graphics::Settings,
         compatible_window: W,
     ) -> Result<Self, graphics::Error> {
         if let Ok(left) = L::new(settings.into(), compatible_window.clone())
@@ -528,3 +525,11 @@ mod geometry {
         }
     }
 }
+
+impl<L, R> compositor::Renderer for Renderer<L, R>
+where
+    L: compositor::Renderer,
+    R: compositor::Renderer,
+{
+    type Compositor = Compositor<L::Compositor, R::Compositor>;
+}
diff --git a/renderer/src/lib.rs b/renderer/src/lib.rs
index 199b431e..7c48995d 100644
--- a/renderer/src/lib.rs
+++ b/renderer/src/lib.rs
@@ -6,16 +6,12 @@ pub use iced_wgpu as wgpu;
 
 pub mod fallback;
 
-mod settings;
-
 pub use iced_graphics as graphics;
 pub use iced_graphics::core;
 
 #[cfg(feature = "geometry")]
 pub use iced_graphics::geometry;
 
-pub use settings::Settings;
-
 /// The default graphics renderer for [`iced`].
 ///
 /// [`iced`]: https://github.com/iced-rs/iced
diff --git a/renderer/src/settings.rs b/renderer/src/settings.rs
deleted file mode 100644
index 27788db9..00000000
--- a/renderer/src/settings.rs
+++ /dev/null
@@ -1,55 +0,0 @@
-use crate::core::{Font, Pixels};
-use crate::graphics::Antialiasing;
-
-/// The settings of a Backend.
-#[derive(Debug, Clone, Copy, PartialEq)]
-pub struct Settings {
-    /// The default [`Font`] to use.
-    pub default_font: Font,
-
-    /// The default size of text.
-    ///
-    /// By default, it will be set to `16.0`.
-    pub default_text_size: Pixels,
-
-    /// The antialiasing strategy that will be used for triangle primitives.
-    ///
-    /// By default, it is `None`.
-    pub antialiasing: Option<Antialiasing>,
-}
-
-impl Default for Settings {
-    fn default() -> Settings {
-        Settings {
-            default_font: Font::default(),
-            default_text_size: Pixels(16.0),
-            antialiasing: None,
-        }
-    }
-}
-
-#[cfg(feature = "tiny-skia")]
-impl From<Settings> for iced_tiny_skia::Settings {
-    fn from(settings: Settings) -> Self {
-        Self {
-            default_font: settings.default_font,
-            default_text_size: settings.default_text_size,
-        }
-    }
-}
-
-#[cfg(feature = "wgpu")]
-impl From<Settings> for iced_wgpu::Settings {
-    fn from(settings: Settings) -> Self {
-        Self {
-            default_font: settings.default_font,
-            default_text_size: settings.default_text_size,
-            antialiasing: settings.antialiasing,
-            ..iced_wgpu::Settings::default()
-        }
-    }
-}
-
-impl From<Settings> for () {
-    fn from(_settings: Settings) -> Self {}
-}
diff --git a/runtime/src/program.rs b/runtime/src/program.rs
index 6c1b8f07..0ea94d3b 100644
--- a/runtime/src/program.rs
+++ b/runtime/src/program.rs
@@ -2,7 +2,7 @@
 use crate::Command;
 
 use iced_core::text;
-use iced_core::{Element, Renderer};
+use iced_core::Element;
 
 mod state;
 
@@ -11,7 +11,7 @@ pub use state::State;
 /// The core of a user interface application following The Elm Architecture.
 pub trait Program: Sized {
     /// The graphics backend to use to draw the [`Program`].
-    type Renderer: Renderer + text::Renderer;
+    type Renderer: text::Renderer;
 
     /// The theme used to draw the [`Program`].
     type Theme;
diff --git a/src/application.rs b/src/application.rs
index 8317abcb..62fe77da 100644
--- a/src/application.rs
+++ b/src/application.rs
@@ -1,4 +1,6 @@
 //! Build interactive cross-platform applications.
+use crate::core::text;
+use crate::graphics::compositor;
 use crate::shell::application;
 use crate::{Command, Element, Executor, Settings, Subscription};
 
@@ -60,7 +62,7 @@ pub use application::{Appearance, DefaultStyle};
 /// ```no_run
 /// use iced::advanced::Application;
 /// use iced::executor;
-/// use iced::{Command, Element, Settings, Theme};
+/// use iced::{Command, Element, Settings, Theme, Renderer};
 ///
 /// pub fn main() -> iced::Result {
 ///     Hello::run(Settings::default())
@@ -73,6 +75,7 @@ pub use application::{Appearance, DefaultStyle};
 ///     type Flags = ();
 ///     type Message = ();
 ///     type Theme = Theme;
+///     type Renderer = Renderer;
 ///
 ///     fn new(_flags: ()) -> (Hello, Command<Self::Message>) {
 ///         (Hello, Command::none())
@@ -109,6 +112,9 @@ where
     /// The theme of your [`Application`].
     type Theme: Default;
 
+    /// The renderer of your [`Application`].
+    type Renderer: text::Renderer + compositor::Renderer;
+
     /// The data needed to initialize your [`Application`].
     type Flags;
 
@@ -142,7 +148,7 @@ where
     /// Returns the widgets to display in the [`Application`].
     ///
     /// These widgets can produce __messages__ based on user interaction.
-    fn view(&self) -> Element<'_, Self::Message, Self::Theme, crate::Renderer>;
+    fn view(&self) -> Element<'_, Self::Message, Self::Theme, Self::Renderer>;
 
     /// Returns the current [`Theme`] of the [`Application`].
     ///
@@ -195,7 +201,7 @@ where
         Self: 'static,
     {
         #[allow(clippy::needless_update)]
-        let renderer_settings = crate::renderer::Settings {
+        let renderer_settings = crate::graphics::Settings {
             default_font: settings.default_font,
             default_text_size: settings.default_text_size,
             antialiasing: if settings.antialiasing {
@@ -203,13 +209,13 @@ where
             } else {
                 None
             },
-            ..crate::renderer::Settings::default()
+            ..crate::graphics::Settings::default()
         };
 
         let run = crate::shell::application::run::<
             Instance<Self>,
             Self::Executor,
-            crate::renderer::Compositor,
+            <Self::Renderer as compositor::Renderer>::Compositor,
         >(settings.into(), renderer_settings);
 
         #[cfg(target_arch = "wasm32")]
@@ -241,7 +247,7 @@ where
 {
     type Message = A::Message;
     type Theme = A::Theme;
-    type Renderer = crate::Renderer;
+    type Renderer = A::Renderer;
 
     fn update(&mut self, message: Self::Message) -> Command<Self::Message> {
         self.0.update(message)
diff --git a/src/lib.rs b/src/lib.rs
index 0e9566e2..171109e7 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -372,15 +372,16 @@ pub type Result = std::result::Result<(), Error>;
 ///     ]
 /// }
 /// ```
-pub fn run<State, Message, Theme>(
+pub fn run<State, Message, Theme, Renderer>(
     title: impl program::Title<State> + 'static,
     update: impl program::Update<State, Message> + 'static,
-    view: impl for<'a> program::View<'a, State, Message, Theme> + 'static,
+    view: impl for<'a> program::View<'a, State, Message, Theme, Renderer> + 'static,
 ) -> Result
 where
     State: Default + 'static,
     Message: std::fmt::Debug + Send + 'static,
     Theme: Default + program::DefaultStyle + 'static,
+    Renderer: graphics::compositor::Renderer + core::text::Renderer + 'static,
 {
     program(title, update, view).run()
 }
diff --git a/src/multi_window.rs b/src/multi_window.rs
index fca0be46..b81297dc 100644
--- a/src/multi_window.rs
+++ b/src/multi_window.rs
@@ -174,7 +174,7 @@ where
         Self: 'static,
     {
         #[allow(clippy::needless_update)]
-        let renderer_settings = crate::renderer::Settings {
+        let renderer_settings = crate::graphics::Settings {
             default_font: settings.default_font,
             default_text_size: settings.default_text_size,
             antialiasing: if settings.antialiasing {
@@ -182,7 +182,7 @@ where
             } else {
                 None
             },
-            ..crate::renderer::Settings::default()
+            ..crate::graphics::Settings::default()
         };
 
         Ok(crate::shell::multi_window::run::<
diff --git a/src/program.rs b/src/program.rs
index 7a366585..f5a2bc53 100644
--- a/src/program.rs
+++ b/src/program.rs
@@ -32,6 +32,7 @@
 //! ```
 use crate::application::Application;
 use crate::executor::{self, Executor};
+use crate::graphics::compositor;
 use crate::window;
 use crate::{Command, Element, Font, Result, Settings, Size, Subscription};
 
@@ -67,37 +68,41 @@ use std::borrow::Cow;
 ///     ]
 /// }
 /// ```
-pub fn program<State, Message, Theme>(
+pub fn program<State, Message, Theme, Renderer>(
     title: impl Title<State>,
     update: impl Update<State, Message>,
-    view: impl for<'a> self::View<'a, State, Message, Theme>,
+    view: impl for<'a> self::View<'a, State, Message, Theme, Renderer>,
 ) -> Program<impl Definition<State = State, Message = Message, Theme = Theme>>
 where
     State: 'static,
     Message: Send + std::fmt::Debug,
     Theme: Default + DefaultStyle,
+    Renderer: compositor::Renderer + crate::core::text::Renderer,
 {
     use std::marker::PhantomData;
 
-    struct Application<State, Message, Theme, Update, View> {
+    struct Application<State, Message, Theme, Renderer, Update, View> {
         update: Update,
         view: View,
         _state: PhantomData<State>,
         _message: PhantomData<Message>,
         _theme: PhantomData<Theme>,
+        _renderer: PhantomData<Renderer>,
     }
 
-    impl<State, Message, Theme, Update, View> Definition
-        for Application<State, Message, Theme, Update, View>
+    impl<State, Message, Theme, Renderer, Update, View> Definition
+        for Application<State, Message, Theme, Renderer, Update, View>
     where
         Message: Send + std::fmt::Debug,
         Theme: Default + DefaultStyle,
+        Renderer: compositor::Renderer + crate::core::text::Renderer,
         Update: self::Update<State, Message>,
-        View: for<'a> self::View<'a, State, Message, Theme>,
+        View: for<'a> self::View<'a, State, Message, Theme, Renderer>,
     {
         type State = State;
         type Message = Message;
         type Theme = Theme;
+        type Renderer = Renderer;
         type Executor = executor::Default;
 
         fn load(&self) -> Command<Self::Message> {
@@ -115,7 +120,7 @@ where
         fn view<'a>(
             &self,
             state: &'a Self::State,
-        ) -> Element<'a, Self::Message, Self::Theme> {
+        ) -> Element<'a, Self::Message, Self::Theme, Self::Renderer> {
             self.view.view(state).into()
         }
     }
@@ -127,6 +132,7 @@ where
             _state: PhantomData,
             _message: PhantomData,
             _theme: PhantomData,
+            _renderer: PhantomData,
         },
         settings: Settings::default(),
     }
@@ -184,6 +190,7 @@ impl<P: Definition> Program<P> {
         impl<P: Definition, I: Fn() -> P::State> Application for Instance<P, I> {
             type Message = P::Message;
             type Theme = P::Theme;
+            type Renderer = P::Renderer;
             type Flags = (P, I);
             type Executor = P::Executor;
 
@@ -216,7 +223,7 @@ impl<P: Definition> Program<P> {
 
             fn view(
                 &self,
-            ) -> crate::Element<'_, Self::Message, Self::Theme, crate::Renderer>
+            ) -> crate::Element<'_, Self::Message, Self::Theme, Self::Renderer>
             {
                 self.program.view(&self.state)
             }
@@ -417,6 +424,9 @@ pub trait Definition: Sized {
     /// The theme of the program.
     type Theme: Default + DefaultStyle;
 
+    /// The renderer of the program.
+    type Renderer: compositor::Renderer + crate::core::text::Renderer;
+
     /// The executor of the program.
     type Executor: Executor;
 
@@ -431,7 +441,7 @@ pub trait Definition: Sized {
     fn view<'a>(
         &self,
         state: &'a Self::State,
-    ) -> Element<'a, Self::Message, Self::Theme>;
+    ) -> Element<'a, Self::Message, Self::Theme, Self::Renderer>;
 
     fn title(&self, _state: &Self::State) -> String {
         String::from("A cool iced application!")
@@ -470,6 +480,7 @@ fn with_title<P: Definition>(
         type State = P::State;
         type Message = P::Message;
         type Theme = P::Theme;
+        type Renderer = P::Renderer;
         type Executor = P::Executor;
 
         fn load(&self) -> Command<Self::Message> {
@@ -491,7 +502,7 @@ fn with_title<P: Definition>(
         fn view<'a>(
             &self,
             state: &'a Self::State,
-        ) -> Element<'a, Self::Message, Self::Theme> {
+        ) -> Element<'a, Self::Message, Self::Theme, Self::Renderer> {
             self.program.view(state)
         }
 
@@ -534,6 +545,7 @@ fn with_load<P: Definition>(
         type State = P::State;
         type Message = P::Message;
         type Theme = P::Theme;
+        type Renderer = P::Renderer;
         type Executor = executor::Default;
 
         fn load(&self) -> Command<Self::Message> {
@@ -551,7 +563,7 @@ fn with_load<P: Definition>(
         fn view<'a>(
             &self,
             state: &'a Self::State,
-        ) -> Element<'a, Self::Message, Self::Theme> {
+        ) -> Element<'a, Self::Message, Self::Theme, Self::Renderer> {
             self.program.view(state)
         }
 
@@ -598,6 +610,7 @@ fn with_subscription<P: Definition>(
         type State = P::State;
         type Message = P::Message;
         type Theme = P::Theme;
+        type Renderer = P::Renderer;
         type Executor = executor::Default;
 
         fn subscription(
@@ -622,7 +635,7 @@ fn with_subscription<P: Definition>(
         fn view<'a>(
             &self,
             state: &'a Self::State,
-        ) -> Element<'a, Self::Message, Self::Theme> {
+        ) -> Element<'a, Self::Message, Self::Theme, Self::Renderer> {
             self.program.view(state)
         }
 
@@ -665,6 +678,7 @@ fn with_theme<P: Definition>(
         type State = P::State;
         type Message = P::Message;
         type Theme = P::Theme;
+        type Renderer = P::Renderer;
         type Executor = P::Executor;
 
         fn theme(&self, state: &Self::State) -> Self::Theme {
@@ -690,7 +704,7 @@ fn with_theme<P: Definition>(
         fn view<'a>(
             &self,
             state: &'a Self::State,
-        ) -> Element<'a, Self::Message, Self::Theme> {
+        ) -> Element<'a, Self::Message, Self::Theme, Self::Renderer> {
             self.program.view(state)
         }
 
@@ -729,6 +743,7 @@ fn with_style<P: Definition>(
         type State = P::State;
         type Message = P::Message;
         type Theme = P::Theme;
+        type Renderer = P::Renderer;
         type Executor = P::Executor;
 
         fn style(
@@ -758,7 +773,7 @@ fn with_style<P: Definition>(
         fn view<'a>(
             &self,
             state: &'a Self::State,
-        ) -> Element<'a, Self::Message, Self::Theme> {
+        ) -> Element<'a, Self::Message, Self::Theme, Self::Renderer> {
             self.program.view(state)
         }
 
@@ -834,18 +849,25 @@ where
 ///
 /// This trait allows the [`program`] builder to take any closure that
 /// returns any `Into<Element<'_, Message>>`.
-pub trait View<'a, State, Message, Theme> {
+pub trait View<'a, State, Message, Theme, Renderer> {
     /// Produces the widget of the [`Program`].
-    fn view(&self, state: &'a State) -> impl Into<Element<'a, Message, Theme>>;
+    fn view(
+        &self,
+        state: &'a State,
+    ) -> impl Into<Element<'a, Message, Theme, Renderer>>;
 }
 
-impl<'a, T, State, Message, Theme, Widget> View<'a, State, Message, Theme> for T
+impl<'a, T, State, Message, Theme, Renderer, Widget>
+    View<'a, State, Message, Theme, Renderer> for T
 where
     T: Fn(&'a State) -> Widget,
     State: 'static,
-    Widget: Into<Element<'a, Message, Theme>>,
+    Widget: Into<Element<'a, Message, Theme, Renderer>>,
 {
-    fn view(&self, state: &'a State) -> impl Into<Element<'a, Message, Theme>> {
+    fn view(
+        &self,
+        state: &'a State,
+    ) -> impl Into<Element<'a, Message, Theme, Renderer>> {
         self(state)
     }
 }
diff --git a/tiny_skia/src/settings.rs b/tiny_skia/src/settings.rs
index ec27b218..01d015b4 100644
--- a/tiny_skia/src/settings.rs
+++ b/tiny_skia/src/settings.rs
@@ -1,4 +1,5 @@
 use crate::core::{Font, Pixels};
+use crate::graphics;
 
 /// The settings of a [`Backend`].
 ///
@@ -22,3 +23,12 @@ impl Default for Settings {
         }
     }
 }
+
+impl From<graphics::Settings> for Settings {
+    fn from(settings: graphics::Settings) -> Self {
+        Self {
+            default_font: settings.default_font,
+            default_text_size: settings.default_text_size,
+        }
+    }
+}
diff --git a/tiny_skia/src/window/compositor.rs b/tiny_skia/src/window/compositor.rs
index a98825f1..0c08097b 100644
--- a/tiny_skia/src/window/compositor.rs
+++ b/tiny_skia/src/window/compositor.rs
@@ -1,7 +1,7 @@
 use crate::core::{Color, Rectangle, Size};
 use crate::graphics::compositor::{self, Information};
 use crate::graphics::damage;
-use crate::graphics::{Error, Viewport};
+use crate::graphics::{self, Error, Viewport};
 use crate::{Backend, Primitive, Renderer, Settings};
 
 use std::collections::VecDeque;
@@ -25,15 +25,14 @@ pub struct Surface {
 }
 
 impl crate::graphics::Compositor for Compositor {
-    type Settings = Settings;
     type Renderer = Renderer;
     type Surface = Surface;
 
     fn new<W: compositor::Window>(
-        settings: Self::Settings,
+        settings: graphics::Settings,
         compatible_window: W,
     ) -> impl Future<Output = Result<Self, Error>> {
-        future::ready(Ok(new(settings, compatible_window)))
+        future::ready(Ok(new(settings.into(), compatible_window)))
     }
 
     fn create_renderer(&self) -> Self::Renderer {
diff --git a/wgpu/src/settings.rs b/wgpu/src/settings.rs
index c9338fec..9943aa3e 100644
--- a/wgpu/src/settings.rs
+++ b/wgpu/src/settings.rs
@@ -1,6 +1,6 @@
 //! Configure a renderer.
 use crate::core::{Font, Pixels};
-use crate::graphics::Antialiasing;
+use crate::graphics::{self, Antialiasing};
 
 /// The settings of a [`Backend`].
 ///
@@ -64,3 +64,14 @@ impl Default for Settings {
         }
     }
 }
+
+impl From<graphics::Settings> for Settings {
+    fn from(settings: graphics::Settings) -> Self {
+        Self {
+            default_font: settings.default_font,
+            default_text_size: settings.default_text_size,
+            antialiasing: settings.antialiasing,
+            ..Settings::default()
+        }
+    }
+}
diff --git a/wgpu/src/window/compositor.rs b/wgpu/src/window/compositor.rs
index 328ad781..74dfadba 100644
--- a/wgpu/src/window/compositor.rs
+++ b/wgpu/src/window/compositor.rs
@@ -1,9 +1,8 @@
 //! Connect a window with a renderer.
 use crate::core::{Color, Size};
-use crate::graphics;
 use crate::graphics::color;
 use crate::graphics::compositor;
-use crate::graphics::{Error, Viewport};
+use crate::graphics::{self, Error, Viewport};
 use crate::{Backend, Primitive, Renderer, Settings};
 
 use std::future::Future;
@@ -225,15 +224,14 @@ pub fn present<T: AsRef<str>>(
 }
 
 impl graphics::Compositor for Compositor {
-    type Settings = Settings;
     type Renderer = Renderer;
     type Surface = wgpu::Surface<'static>;
 
     fn new<W: compositor::Window>(
-        settings: Self::Settings,
+        settings: graphics::Settings,
         compatible_window: W,
     ) -> impl Future<Output = Result<Self, Error>> {
-        new(settings, compatible_window)
+        new(settings.into(), compatible_window)
     }
 
     fn create_renderer(&self) -> Self::Renderer {
diff --git a/winit/src/application.rs b/winit/src/application.rs
index 29786b65..d68523fa 100644
--- a/winit/src/application.rs
+++ b/winit/src/application.rs
@@ -13,6 +13,7 @@ use crate::core::window;
 use crate::core::{Color, Event, Point, Size, Theme};
 use crate::futures::futures;
 use crate::futures::{Executor, Runtime, Subscription};
+use crate::graphics;
 use crate::graphics::compositor::{self, Compositor};
 use crate::runtime::clipboard;
 use crate::runtime::program::Program;
@@ -130,7 +131,7 @@ pub fn default(theme: &Theme) -> Appearance {
 /// settings.
 pub async fn run<A, E, C>(
     settings: Settings<A::Flags>,
-    compositor_settings: impl Into<C::Settings>,
+    graphics_settings: graphics::Settings,
 ) -> Result<(), Error>
 where
     A: Application + 'static,
@@ -219,7 +220,7 @@ where
         };
     }
 
-    let compositor = C::new(compositor_settings.into(), window.clone()).await?;
+    let compositor = C::new(graphics_settings, window.clone()).await?;
     let mut renderer = compositor.create_renderer();
 
     for font in settings.fonts {
diff --git a/winit/src/multi_window.rs b/winit/src/multi_window.rs
index c865b0ee..b4c25411 100644
--- a/winit/src/multi_window.rs
+++ b/winit/src/multi_window.rs
@@ -16,6 +16,7 @@ use crate::futures::futures::executor;
 use crate::futures::futures::task;
 use crate::futures::futures::{Future, StreamExt};
 use crate::futures::{Executor, Runtime, Subscription};
+use crate::graphics;
 use crate::graphics::{compositor, Compositor};
 use crate::multi_window::window_manager::WindowManager;
 use crate::runtime::command::{self, Command};
@@ -105,7 +106,7 @@ where
 /// settings.
 pub fn run<A, E, C>(
     settings: Settings<A::Flags>,
-    compositor_settings: impl Into<C::Settings>,
+    graphics_settings: graphics::Settings,
 ) -> Result<(), Error>
 where
     A: Application + 'static,
@@ -186,10 +187,8 @@ where
         };
     }
 
-    let mut compositor = executor::block_on(C::new(
-        compositor_settings.into(),
-        main_window.clone(),
-    ))?;
+    let mut compositor =
+        executor::block_on(C::new(graphics_settings, main_window.clone()))?;
 
     let mut window_manager = WindowManager::new();
     let _ = window_manager.insert(