Curves: Support set origin and apply transform operators

Add support for the Curves object to the "Set Origin" and "Apply Object
Tansform" operators. Also change the automatic handle calculation to
avoid adding Bezier attributes if they don't need to be added.

Differential Revision: https://developer.blender.org/D14526

source/blender/blenkernel/intern/curves_geometry.cc

@@ -772,6 +772,10 @@ void CurvesGeometry::calculate_bezier_auto_handles()
   if (types.is_single() && types.get_internal_single() != CURVE_TYPE_BEZIER) {
     return;
   }
+  if (std::as_const(*this).handle_positions_left().is_empty() ||
+      std::as_const(*this).handle_positions_right().is_empty()) {
+    return;
+  }
   const VArray<bool> cyclic = std::as_const(*this).cyclic();
   const Span<int8_t> types_left = this->handle_types_left();
   const Span<int8_t> types_right = this->handle_types_right();

source/blender/editors/object/object_transform.cc

@@ -7,6 +7,7 @@
 
 #include <cstdlib>
 #include <cstring>
+#include <numeric>
 
 #include "DNA_anim_types.h"
 #include "DNA_armature_types.h"
@@ -29,6 +30,7 @@
 #include "BKE_armature.h"
 #include "BKE_context.h"
 #include "BKE_curve.h"
+#include "BKE_curves.hh"
 #include "BKE_editmesh.h"
 #include "BKE_gpencil.h"
 #include "BKE_gpencil_geom.h"
@@ -68,6 +70,7 @@
 
 using blender::Array;
 using blender::float2;
+using blender::float3;
 using blender::Vector;
 
 /* -------------------------------------------------------------------- */
@@ -691,7 +694,8 @@ static int apply_objects_internal(bContext *C,
              OB_CURVES_LEGACY,
              OB_SURF,
              OB_FONT,
-             OB_GPENCIL)) {
+             OB_GPENCIL,
+             OB_CURVES)) {
       ID *obdata = static_cast<ID *>(ob->data);
       if (!do_multi_user && ID_REAL_USERS(obdata) > 1) {
         BKE_reportf(reports,
@@ -923,6 +927,11 @@ static int apply_objects_internal(bContext *C,
       bGPdata *gpd = static_cast<bGPdata *>(ob->data);
       BKE_gpencil_transform(gpd, mat);
     }
+    else if (ob->type == OB_CURVES) {
+      Curves &curves = *static_cast<Curves *>(ob->data);
+      blender::bke::CurvesGeometry::wrap(curves.geometry).transform(mat);
+      blender::bke::CurvesGeometry::wrap(curves.geometry).calculate_bezier_auto_handles();
+    }
     else if (ob->type == OB_CAMERA) {
       MovieClip *clip = BKE_object_movieclip_get(scene, ob, false);
 
@@ -1185,7 +1194,7 @@ static int object_origin_set_exec(bContext *C, wmOperator *op)
   Object *obact = CTX_data_active_object(C);
   Object *obedit = CTX_data_edit_object(C);
   Depsgraph *depsgraph = CTX_data_ensure_evaluated_depsgraph(C);
-  float cent[3], cent_neg[3], centn[3];
+  float3 cent, cent_neg, centn;
   const float *cursor = scene->cursor.location;
   int centermode = RNA_enum_get(op->ptr, "type");
 
@@ -1574,6 +1583,42 @@ static int object_origin_set_exec(bContext *C, wmOperator *op)
         }
       }
     }
+    else if (ob->type == OB_CURVES) {
+      using namespace blender;
+      Curves &curves_id = *static_cast<Curves *>(ob->data);
+      bke::CurvesGeometry &curves = bke::CurvesGeometry::wrap(curves_id.geometry);
+      if (ELEM(centermode, ORIGIN_TO_CENTER_OF_MASS_SURFACE, ORIGIN_TO_CENTER_OF_MASS_VOLUME) ||
+          !ELEM(around, V3D_AROUND_CENTER_BOUNDS, V3D_AROUND_CENTER_MEDIAN)) {
+        BKE_report(
+            op->reports, RPT_WARNING, "Curves Object does not support this set origin operation");
+        continue;
+      }
+
+      if (curves.points_num() == 0) {
+        continue;
+      }
+
+      if (centermode == ORIGIN_TO_CURSOR) {
+        /* done */
+      }
+      else if (around == V3D_AROUND_CENTER_BOUNDS) {
+        float3 min;
+        float3 max;
+        if (curves.bounds_min_max(min, max)) {
+          cent = math::midpoint(min, max);
+        }
+      }
+      else if (around == V3D_AROUND_CENTER_MEDIAN) {
+        Span<float3> positions = curves.positions();
+        cent = std::accumulate(positions.begin(), positions.end(), float3(0)) /
+               curves.points_num();
+      }
+
+      tot_change++;
+      curves.translate(-cent);
+      curves_id.id.tag |= LIB_TAG_DOIT;
+      do_inverse_offset = true;
+    }
 
     /* offset other selected objects */
     if (do_inverse_offset && (centermode != GEOMETRY_TO_ORIGIN)) {