Support custom renderers in `iced_test` through `renderer::Headless` trait

3 files changed, 20 insertions, 10 deletions

diff --git a/core/src/lib.rs b/core/src/lib.rs
index df599f45..645f7a90 100644
--- a/core/src/lib.rs
+++ b/core/src/lib.rs
@@ -40,6 +40,7 @@ mod pixels;
 mod point;
 mod rectangle;
 mod rotation;
+mod settings;
 mod shadow;
 mod shell;
 mod size;
@@ -67,6 +68,7 @@ pub use point::Point;
 pub use rectangle::Rectangle;
 pub use renderer::Renderer;
 pub use rotation::Rotation;
+pub use settings::Settings;
 pub use shadow::Shadow;
 pub use shell::Shell;
 pub use size::Size;
diff --git a/core/src/renderer.rs b/core/src/renderer.rs
index 6684517f..68e070e8 100644
--- a/core/src/renderer.rs
+++ b/core/src/renderer.rs
@@ -3,7 +3,8 @@
 mod null;
 
 use crate::{
-    Background, Border, Color, Rectangle, Shadow, Size, Transformation, Vector,
+    Background, Border, Color, Font, Pixels, Rectangle, Shadow, Size,
+    Transformation, Vector,
 };
 
 /// A component that can be used by widgets to draw themselves on a screen.
@@ -100,3 +101,19 @@ impl Default for Style {
         }
     }
 }
+
+/// A headless renderer is a renderer that can render offscreen without
+/// a window nor a compositor.
+pub trait Headless {
+    /// Creates a new [`Headless`] renderer;
+    fn new(default_font: Font, default_text_size: Pixels) -> Self;
+
+    /// Draws offscreen into a screenshot, returning a collection of
+    /// bytes representing the rendered pixels in RGBA order.
+    fn screenshot(
+        &mut self,
+        size: Size<u32>,
+        scale_factor: f32,
+        background_color: Color,
+    ) -> Vec<u8>;
+}
diff --git a/src/settings.rs b/core/src/settings.rs
index ebac7a86..36bbb699 100644
--- a/src/settings.rs
+++ b/core/src/settings.rs
@@ -48,12 +48,3 @@ impl Default for Settings {
         }
     }
 }
-
-impl From<Settings> for iced_winit::Settings {
-    fn from(settings: Settings) -> iced_winit::Settings {
-        iced_winit::Settings {
-            id: settings.id,
-            fonts: settings.fonts,
-        }
-    }
-}