Draft custom layout engine based on druid

native/src/size.rs

@@ -0,0 +1,25 @@
+use std::f32;
+
+#[derive(Debug, Clone, Copy, PartialEq)]
+pub struct Size {
+    /// The width.
+    pub width: f32,
+    /// The height.
+    pub height: f32,
+}
+
+impl Size {
+    pub const ZERO: Size = Size::new(0., 0.);
+    pub const INFINITY: Size = Size::new(f32::INFINITY, f32::INFINITY);
+
+    pub const fn new(width: f32, height: f32) -> Self {
+        Size { width, height }
+    }
+
+    pub fn pad(&self, padding: f32) -> Self {
+        Size {
+            width: self.width + padding * 2.0,
+            height: self.height + padding * 2.0,
+        }
+    }
+}