Curves: Add method to access cyclic attribute

Avoids the need to use the attribute API to access this commonly
used builtin attribute.

1 files changed, 18 insertions, 0 deletions

diff --git a/source/blender/blenkernel/intern/curves_geometry.cc b/source/blender/blenkernel/intern/curves_geometry.cc
index 68797942b56..3eea579230a 100644
--- a/source/blender/blenkernel/intern/curves_geometry.cc
+++ b/source/blender/blenkernel/intern/curves_geometry.cc
@@ -18,6 +18,7 @@ namespace blender::bke {
 static const std::string ATTR_POSITION = "position";
 static const std::string ATTR_RADIUS = "radius";
 static const std::string ATTR_CURVE_TYPE = "curve_type";
+static const std::string ATTR_CYCLIC = "cyclic";
 
 /* -------------------------------------------------------------------- */
 /** \name Constructors/Destructor
@@ -168,6 +169,23 @@ Span<int> CurvesGeometry::offsets() const
   return {this->curve_offsets, this->curve_size + 1};
 }
 
+VArray<bool> CurvesGeometry::cyclic() const
+{
+  const bool *data = (const bool *)CustomData_get_layer_named(
+      &this->curve_data, CD_PROP_INT8, ATTR_CURVE_TYPE.c_str());
+  if (data != nullptr) {
+    return VArray<bool>::ForSpan(Span(data, this->curve_size));
+  }
+  return VArray<bool>::ForSingle(false, this->curve_size);
+}
+
+MutableSpan<bool> CurvesGeometry::cyclic()
+{
+  bool *data = (bool *)CustomData_add_layer_named(
+      &this->curve_data, CD_PROP_BOOL, CD_CALLOC, nullptr, this->curve_size, ATTR_CYCLIC.c_str());
+  return {data, this->curve_size};
+}
+
 void CurvesGeometry::resize(const int point_size, const int curve_size)
 {
   if (point_size != this->point_size) {