Implement Canvas support for iced_tiny_skia

tiny_skia/src/primitive.rs

@@ -0,0 +1,82 @@
+use crate::{Rectangle, Vector};
+
+use std::sync::Arc;
+
+#[derive(Debug, Clone)]
+pub enum Primitive {
+    /// A group of primitives
+    Group {
+        /// The primitives of the group
+        primitives: Vec<Primitive>,
+    },
+    /// A clip primitive
+    Clip {
+        /// The bounds of the clip
+        bounds: Rectangle,
+        /// The content of the clip
+        content: Box<Primitive>,
+    },
+    /// A primitive that applies a translation
+    Translate {
+        /// The translation vector
+        translation: Vector,
+
+        /// The primitive to translate
+        content: Box<Primitive>,
+    },
+    /// A cached primitive.
+    ///
+    /// This can be useful if you are implementing a widget where primitive
+    /// generation is expensive.
+    Cached {
+        /// The cached primitive
+        cache: Arc<Primitive>,
+    },
+    /// A basic primitive.
+    Basic(iced_graphics::Primitive),
+}
+
+impl iced_graphics::backend::Primitive for Primitive {
+    fn translate(self, translation: Vector) -> Self {
+        Self::Translate {
+            translation,
+            content: Box::new(self),
+        }
+    }
+
+    fn clip(self, bounds: Rectangle) -> Self {
+        Self::Clip {
+            bounds,
+            content: Box::new(self),
+        }
+    }
+}
+
+#[derive(Debug, Clone, Default)]
+pub struct Recording(pub(crate) Vec<Primitive>);
+
+impl iced_graphics::backend::Recording for Recording {
+    type Primitive = Primitive;
+
+    fn push(&mut self, primitive: Primitive) {
+        self.0.push(primitive);
+    }
+
+    fn push_basic(&mut self, basic: iced_graphics::Primitive) {
+        self.0.push(Primitive::Basic(basic));
+    }
+
+    fn group(self) -> Self::Primitive {
+        Primitive::Group { primitives: self.0 }
+    }
+
+    fn clear(&mut self) {
+        self.0.clear();
+    }
+}
+
+impl Recording {
+    pub fn primitives(&self) -> &[Primitive] {
+        &self.0
+    }
+}