Splines: Add a method for reversing a Spline

This moved the spline reversing logic out of the Curve Reverse geometry
node and into the spline class. This allows a spline to reverse itself
with a call to `my_spline.reverse()`

The base class will reverse position, radii & tilt, while specialized
versions are created for Bezier and Nurbs splines to reverse the
additional data that these classes encapsulate.

Differential Revision: https://developer.blender.org/D12501

1 files changed, 11 insertions, 0 deletions

diff --git a/source/blender/blenkernel/intern/spline_bezier.cc b/source/blender/blenkernel/intern/spline_bezier.cc
index b6764f65631..79d2137ee84 100644
--- a/source/blender/blenkernel/intern/spline_bezier.cc
+++ b/source/blender/blenkernel/intern/spline_bezier.cc
@@ -166,6 +166,17 @@ MutableSpan<float3> BezierSpline::handle_positions_right()
   return handle_positions_right_;
 }
 
+void BezierSpline::reverse_impl()
+{
+  this->handle_positions_left().reverse();
+  this->handle_positions_right().reverse();
+  std::swap(this->handle_positions_left_, this->handle_positions_right_);
+
+  this->handle_types_left().reverse();
+  this->handle_types_right().reverse();
+  std::swap(this->handle_types_left_, this->handle_types_right_);
+}
+
 static float3 previous_position(Span<float3> positions, const bool cyclic, const int i)
 {
   if (i == 0) {