refactor(layouts): add darwin feature gate and expand win32 feature gate

This commit builds on the newly introduced komorebi-layouts crate to
make it suitable for wholesale adoption in komorebi for Mac.

komorebi-layouts/src/rect.rs

@@ -4,6 +4,15 @@ use serde::Serialize;
 #[cfg(feature = "win32")]
 use windows::Win32::Foundation::RECT;
 
+#[cfg(feature = "darwin")]
+use objc2_core_foundation::CGFloat;
+#[cfg(feature = "darwin")]
+use objc2_core_foundation::CGPoint;
+#[cfg(feature = "darwin")]
+use objc2_core_foundation::CGRect;
+#[cfg(feature = "darwin")]
+use objc2_core_foundation::CGSize;
+
 #[derive(Debug, Default, Clone, Copy, Serialize, Deserialize, Eq, PartialEq)]
 #[cfg_attr(feature = "schemars", derive(schemars::JsonSchema))]
 /// Rectangle dimensions
@@ -42,6 +51,53 @@ impl From<Rect> for RECT {
     }
 }
 
+#[cfg(feature = "darwin")]
+impl From<CGSize> for Rect {
+    fn from(value: CGSize) -> Self {
+        Self {
+            left: 0,
+            top: 0,
+            right: value.width as i32,
+            bottom: value.height as i32,
+        }
+    }
+}
+
+#[cfg(feature = "darwin")]
+impl From<CGRect> for Rect {
+    fn from(value: CGRect) -> Self {
+        Self {
+            left: value.origin.x as i32,
+            top: value.origin.y as i32,
+            right: value.size.width as i32,
+            bottom: value.size.height as i32,
+        }
+    }
+}
+
+#[cfg(feature = "darwin")]
+impl From<&Rect> for CGRect {
+    fn from(value: &Rect) -> Self {
+        Self {
+            origin: CGPoint {
+                x: value.left as CGFloat,
+                y: value.top as CGFloat,
+            },
+            size: CGSize {
+                width: value.right as CGFloat,
+                height: value.bottom as CGFloat,
+            },
+        }
+    }
+}
+
+#[cfg(feature = "darwin")]
+impl From<Rect> for CGRect {
+    fn from(value: Rect) -> Self {
+        CGRect::from(&value)
+    }
+}
+
 impl Rect {
     pub fn is_same_size_as(&self, rhs: &Self) -> bool {
         self.right == rhs.right && self.bottom == rhs.bottom
@@ -110,4 +166,19 @@ impl Rect {
             bottom: self.top + self.bottom,
         }
     }
+
+    #[cfg(feature = "darwin")]
+    #[must_use]
+    pub fn percentage_within_horizontal_bounds(&self, other: &Rect) -> f64 {
+        let overlap_left = self.left.max(other.left);
+        let overlap_right = (self.left + self.right).min(other.left + other.right);
+
+        let overlap_width = overlap_right - overlap_left;
+
+        if overlap_width <= 0 {
+            0.0
+        } else {
+            (overlap_width as f64) / (other.right as f64) * 100.0
+        }
+    }
 }