Curves: Port parameter node to the new data-block

Using the evaluated lengths cache from 72d25fa41d8c575, re-implement
the curve parameter node with the new data structure. Conceptually
it works the same way, but the code is restructured and cleaned up
a bit as well. This also adds support for Catmull Rom curves.

Differential Revision: https://developer.blender.org/D14461

1 files changed, 7 insertions, 0 deletions

diff --git a/source/blender/blenkernel/BKE_curves.hh b/source/blender/blenkernel/BKE_curves.hh
index 13b3d280bc7..29cf38421d1 100644
--- a/source/blender/blenkernel/BKE_curves.hh
+++ b/source/blender/blenkernel/BKE_curves.hh
@@ -273,6 +273,12 @@ class CurvesGeometry : public ::CurvesGeometry {
   /** Makes sure the data described by #evaluated_offsets if necessary. */
   void ensure_evaluated_offsets() const;
 
+  /**
+   * Retrieve offsets into a Bezier curve's avaluated points for each control point.
+   * Call #ensure_evaluated_offsets() first to ensure that the evaluated offsets cache is current.
+   */
+  Span<int> bezier_evaluated_offsets_for_curve(int curve_index) const;
+
   Span<float3> evaluated_positions() const;
 
   /**
@@ -285,6 +291,7 @@ class CurvesGeometry : public ::CurvesGeometry {
    * but is passed for performance reasons to avoid looking up the attribute.
    */
   Span<float> evaluated_lengths_for_curve(int curve_index, bool cyclic) const;
+  float evaluated_length_total_for_curve(int curve_index, bool cyclic) const;
 
   /** Calculates the data described by #evaluated_lengths_for_curve if necessary. */
   void ensure_evaluated_lengths() const;