Introduce custom backend-specific primitives

graphics/src/geometry.rs

@@ -14,20 +14,10 @@ pub use text::Text;
 
 pub use crate::gradient::{self, Gradient};
 
-use crate::Primitive;
-
-/// A bunch of shapes that can be drawn.
-#[derive(Debug, Clone)]
-pub struct Geometry(pub Primitive);
-
-impl From<Geometry> for Primitive {
-    fn from(geometry: Geometry) -> Self {
-        geometry.0
-    }
-}
-
 /// A renderer capable of drawing some [`Geometry`].
 pub trait Renderer: crate::core::Renderer {
+    type Geometry;
+
     /// Draws the given layers of [`Geometry`].
-    fn draw(&mut self, layers: Vec<Geometry>);
+    fn draw(&mut self, layers: Vec<Self::Geometry>);
 }