Curves: New tools for curves sculpt mode.

This commit contains various new features for curves sculpt mode
that have been developed in parallel.

* Selection:
  * Operator to select points/curves randomly.
  * Operator to select endpoints of curves.
  * Operator to grow/shrink an existing selection.
* New Brushes:
  * Pinch: Moves points towards the brush center.
  * Smooth: Makes individual curves straight without changing the root
    or tip position.
  * Puff: Makes curves stand up, aligning them with the surface normal.
  * Density: Add or remove curves to achieve a certain density defined
    by a minimum distance value.
  * Slide: Move root points on the surface.

Differential Revision: https://developer.blender.org/D15134

1 files changed, 7 insertions, 1 deletions

diff --git a/source/blender/editors/include/ED_curves.h b/source/blender/editors/include/ED_curves.h
index 9233b65b2ce..68e09fd1b12 100644
--- a/source/blender/editors/include/ED_curves.h
+++ b/source/blender/editors/include/ED_curves.h
@@ -6,6 +6,8 @@
 
 #pragma once
 
+struct bContext;
+
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -19,10 +21,14 @@ void ED_operatortypes_curves(void);
 #ifdef __cplusplus
 
 #  include "BKE_curves.hh"
+#  include "BLI_vector_set.hh"
 
 namespace blender::ed::curves {
 
 bke::CurvesGeometry primitive_random_sphere(int curves_size, int points_per_curve);
+bool selection_operator_poll(bContext *C);
+bool has_anything_selected(const Curves &curves_id);
+VectorSet<Curves *> get_unique_editable_curves(const bContext &C);
 
-}
+}  // namespace blender::ed::curves
 #endif