From 2aa4a82499d4becd2284cdb482213d541b8804dd Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 28 Apr 2024 16:29:10 +0200
Subject: Adding upstream version 86.0.1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 third_party/rust/euclid/src/homogen.rs | 215 +++++++++++++++++++++++++++++++++
 1 file changed, 215 insertions(+)
 create mode 100644 third_party/rust/euclid/src/homogen.rs

(limited to 'third_party/rust/euclid/src/homogen.rs')

diff --git a/third_party/rust/euclid/src/homogen.rs b/third_party/rust/euclid/src/homogen.rs
new file mode 100644
index 0000000000..850726bb2f
--- /dev/null
+++ b/third_party/rust/euclid/src/homogen.rs
@@ -0,0 +1,215 @@
+// Copyright 2018 The Servo Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use crate::point::{Point2D, Point3D};
+use crate::vector::{Vector2D, Vector3D};
+
+use crate::num::{One, Zero};
+
+use core::cmp::{Eq, PartialEq};
+use core::fmt;
+use core::hash::Hash;
+use core::marker::PhantomData;
+use core::ops::Div;
+#[cfg(feature = "serde")]
+use serde;
+
+/// Homogeneous vector in 3D space.
+#[repr(C)]
+pub struct HomogeneousVector<T, U> {
+    pub x: T,
+    pub y: T,
+    pub z: T,
+    pub w: T,
+    #[doc(hidden)]
+    pub _unit: PhantomData<U>,
+}
+
+impl<T: Copy, U> Copy for HomogeneousVector<T, U> {}
+
+impl<T: Clone, U> Clone for HomogeneousVector<T, U> {
+    fn clone(&self) -> Self {
+        HomogeneousVector {
+            x: self.x.clone(),
+            y: self.y.clone(),
+            z: self.z.clone(),
+            w: self.w.clone(),
+            _unit: PhantomData,
+        }
+    }
+}
+
+#[cfg(feature = "serde")]
+impl<'de, T, U> serde::Deserialize<'de> for HomogeneousVector<T, U>
+where
+    T: serde::Deserialize<'de>,
+{
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: serde::Deserializer<'de>,
+    {
+        let (x, y, z, w) = serde::Deserialize::deserialize(deserializer)?;
+        Ok(HomogeneousVector {
+            x,
+            y,
+            z,
+            w,
+            _unit: PhantomData,
+        })
+    }
+}
+
+#[cfg(feature = "serde")]
+impl<T, U> serde::Serialize for HomogeneousVector<T, U>
+where
+    T: serde::Serialize,
+{
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: serde::Serializer,
+    {
+        (&self.x, &self.y, &self.z, &self.w).serialize(serializer)
+    }
+}
+
+impl<T, U> Eq for HomogeneousVector<T, U> where T: Eq {}
+
+impl<T, U> PartialEq for HomogeneousVector<T, U>
+where
+    T: PartialEq,
+{
+    fn eq(&self, other: &Self) -> bool {
+        self.x == other.x && self.y == other.y && self.z == other.z && self.w == other.w
+    }
+}
+
+impl<T, U> Hash for HomogeneousVector<T, U>
+where
+    T: Hash,
+{
+    fn hash<H: core::hash::Hasher>(&self, h: &mut H) {
+        self.x.hash(h);
+        self.y.hash(h);
+        self.z.hash(h);
+        self.w.hash(h);
+    }
+}
+
+impl<T, U> HomogeneousVector<T, U> {
+    /// Constructor taking scalar values directly.
+    #[inline]
+    pub const fn new(x: T, y: T, z: T, w: T) -> Self {
+        HomogeneousVector {
+            x,
+            y,
+            z,
+            w,
+            _unit: PhantomData,
+        }
+    }
+}
+
+impl<T: Copy + Div<T, Output = T> + Zero + PartialOrd, U> HomogeneousVector<T, U> {
+    /// Convert into Cartesian 2D point.
+    ///
+    /// Returns None if the point is on or behind the W=0 hemisphere.
+    #[inline]
+    pub fn to_point2d(self) -> Option<Point2D<T, U>> {
+        if self.w > T::zero() {
+            Some(Point2D::new(self.x / self.w, self.y / self.w))
+        } else {
+            None
+        }
+    }
+
+    /// Convert into Cartesian 3D point.
+    ///
+    /// Returns None if the point is on or behind the W=0 hemisphere.
+    #[inline]
+    pub fn to_point3d(self) -> Option<Point3D<T, U>> {
+        if self.w > T::zero() {
+            Some(Point3D::new(
+                self.x / self.w,
+                self.y / self.w,
+                self.z / self.w,
+            ))
+        } else {
+            None
+        }
+    }
+}
+
+impl<T: Zero, U> From<Vector2D<T, U>> for HomogeneousVector<T, U> {
+    #[inline]
+    fn from(v: Vector2D<T, U>) -> Self {
+        HomogeneousVector::new(v.x, v.y, T::zero(), T::zero())
+    }
+}
+
+impl<T: Zero, U> From<Vector3D<T, U>> for HomogeneousVector<T, U> {
+    #[inline]
+    fn from(v: Vector3D<T, U>) -> Self {
+        HomogeneousVector::new(v.x, v.y, v.z, T::zero())
+    }
+}
+
+impl<T: Zero + One, U> From<Point2D<T, U>> for HomogeneousVector<T, U> {
+    #[inline]
+    fn from(p: Point2D<T, U>) -> Self {
+        HomogeneousVector::new(p.x, p.y, T::zero(), T::one())
+    }
+}
+
+impl<T: One, U> From<Point3D<T, U>> for HomogeneousVector<T, U> {
+    #[inline]
+    fn from(p: Point3D<T, U>) -> Self {
+        HomogeneousVector::new(p.x, p.y, p.z, T::one())
+    }
+}
+
+impl<T: fmt::Debug, U> fmt::Debug for HomogeneousVector<T, U> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        f.debug_tuple("")
+            .field(&self.x)
+            .field(&self.y)
+            .field(&self.z)
+            .field(&self.w)
+            .finish()
+    }
+}
+
+#[cfg(test)]
+mod homogeneous {
+    use super::HomogeneousVector;
+    use crate::default::{Point2D, Point3D};
+
+    #[test]
+    fn roundtrip() {
+        assert_eq!(
+            Some(Point2D::new(1.0, 2.0)),
+            HomogeneousVector::from(Point2D::new(1.0, 2.0)).to_point2d()
+        );
+        assert_eq!(
+            Some(Point3D::new(1.0, -2.0, 0.1)),
+            HomogeneousVector::from(Point3D::new(1.0, -2.0, 0.1)).to_point3d()
+        );
+    }
+
+    #[test]
+    fn negative() {
+        assert_eq!(
+            None,
+            HomogeneousVector::<f32, ()>::new(1.0, 2.0, 3.0, 0.0).to_point2d()
+        );
+        assert_eq!(
+            None,
+            HomogeneousVector::<f32, ()>::new(1.0, -2.0, -3.0, -2.0).to_point3d()
+        );
+    }
+}
-- 
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