Fix T81743: Changed behaviour in RGB Curves node interpolation

Restore the old `correct_bezpart()` (pre-rBda95d1d851b4) function as
`BKE_curve_correct_bezpart()`, and use that where the old behaviour was
desired (that is, curve maps like used by the RGB Curves shader node).

The new (post-rBda95d1d851b4) function is also renamed to
`BKE_fcurve_correct_bezpart()` to avoid confusion.

1 files changed, 2 insertions, 0 deletions

diff --git a/source/blender/blenkernel/BKE_curve.h b/source/blender/blenkernel/BKE_curve.h
index d9138db2769..dcb4a993da1 100644
--- a/source/blender/blenkernel/BKE_curve.h
+++ b/source/blender/blenkernel/BKE_curve.h
@@ -158,6 +158,8 @@ void BKE_curve_rect_from_textbox(const struct Curve *cu,
                                  const struct TextBox *tb,
                                  struct rctf *r_rect);
 
+void BKE_curve_correct_bezpart(const float v1[2], float v2[2], float v3[2], const float v4[2]);
+
 /* ** Nurbs ** */
 
 bool BKE_nurbList_index_get_co(struct ListBase *editnurb, const int index, float r_co[3]);