Introduce custom backend-specific primitives

tiny_skia/src/primitive.rs

@@ -0,0 +1,48 @@
+use crate::core::Rectangle;
+use crate::graphics::Damage;
+
+pub type Primitive = crate::graphics::Primitive<Custom>;
+
+#[derive(Debug, Clone, PartialEq)]
+pub enum Custom {
+    /// A path filled with some paint.
+    Fill {
+        /// The path to fill.
+        path: tiny_skia::Path,
+        /// The paint to use.
+        paint: tiny_skia::Paint<'static>,
+        /// The fill rule to follow.
+        rule: tiny_skia::FillRule,
+        /// The transform to apply to the path.
+        transform: tiny_skia::Transform,
+    },
+    /// A path stroked with some paint.
+    Stroke {
+        /// The path to stroke.
+        path: tiny_skia::Path,
+        /// The paint to use.
+        paint: tiny_skia::Paint<'static>,
+        /// The stroke settings.
+        stroke: tiny_skia::Stroke,
+        /// The transform to apply to the path.
+        transform: tiny_skia::Transform,
+    },
+}
+
+impl Damage for Custom {
+    fn bounds(&self) -> Rectangle {
+        match self {
+            Self::Fill { path, .. } | Self::Stroke { path, .. } => {
+                let bounds = path.bounds();
+
+                Rectangle {
+                    x: bounds.x(),
+                    y: bounds.y(),
+                    width: bounds.width(),
+                    height: bounds.height(),
+                }
+                .expand(1.0)
+            }
+        }
+    }
+}