From 126133ead775fda064a6c23503e9a552a10dc2c5 Mon Sep 17 00:00:00 2001
From: Héctor Ramón Jiménez <hector0193@gmail.com>
Date: Sat, 22 Feb 2020 18:03:49 +0100
Subject: Fix `Clip` primitive intersection in `iced_wgpu`

---
 core/src/rectangle.rs | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)

(limited to 'core/src/rectangle.rs')

diff --git a/core/src/rectangle.rs b/core/src/rectangle.rs
index ee1e3807..7ed3d2df 100644
--- a/core/src/rectangle.rs
+++ b/core/src/rectangle.rs
@@ -27,6 +27,34 @@ impl Rectangle<f32> {
             && self.y <= point.y
             && point.y <= self.y + self.height
     }
+
+    /// Computes the intersection with the given [`Rectangle`].
+    ///
+    /// [`Rectangle`]: struct.Rectangle.html
+    pub fn intersection(
+        &self,
+        other: &Rectangle<f32>,
+    ) -> Option<Rectangle<f32>> {
+        let x = self.x.max(other.x);
+        let y = self.y.max(other.y);
+
+        let lower_right_x = (self.x + self.width).min(other.x + other.width);
+        let lower_right_y = (self.y + self.height).min(other.y + other.height);
+
+        let width = lower_right_x - x;
+        let height = lower_right_y - y;
+
+        if width > 0.0 && height > 0.0 {
+            Some(Rectangle {
+                x,
+                y,
+                width,
+                height,
+            })
+        } else {
+            None
+        }
+    }
 }
 
 impl std::ops::Mul<f32> for Rectangle<u32> {
@@ -41,3 +69,25 @@ impl std::ops::Mul<f32> for Rectangle<u32> {
         }
     }
 }
+
+impl From<Rectangle<u32>> for Rectangle<f32> {
+    fn from(rectangle: Rectangle<u32>) -> Rectangle<f32> {
+        Rectangle {
+            x: rectangle.x as f32,
+            y: rectangle.y as f32,
+            width: rectangle.width as f32,
+            height: rectangle.height as f32,
+        }
+    }
+}
+
+impl From<Rectangle<f32>> for Rectangle<u32> {
+    fn from(rectangle: Rectangle<f32>) -> Rectangle<u32> {
+        Rectangle {
+            x: rectangle.x as u32,
+            y: rectangle.y as u32,
+            width: rectangle.width.ceil() as u32,
+            height: rectangle.height.ceil() as u32,
+        }
+    }
+}
-- 
cgit