Curves extrude operator

- Array & -> MutableSpan
- Remove unnecessary `blender::`
- Remove "obj" from function dealing with just curves
- Use reference instead of pointer
- Explicitly write operator idname
- Comment style
- Expand one cryptic variable name

@@ -0,0 +12,4 @@
+
+namespace blender::ed::curves {
+
+struct CurveCopy {

@@ -0,0 +70,4 @@
+}
+
+static int sel_to_copy_ints(const IndexMask selection,
+                            const Span<int> &offsets,

@@ -0,0 +144,4 @@
+  Object *obedit = CTX_data_edit_object(C);
+  Curves *curves_id = static_cast<Curves *>(obedit->data);
+  const eAttrDomain selection_domain = eAttrDomain(curves_id->selection_domain);
+  if (selection_domain == ATTR_DOMAIN_POINT) {

@@ -0,0 +152,4 @@
+      bke::CurvesGeometry &curves = curves_id->geometry.wrap();
+
+      const int max = selection.size() * 2 + curves.curves_num() * 2;
+      int *const all_copy_intervals = static_cast<int *>(

@@ -0,0 +164,4 @@
+
+      bke::CurvesGeometry new_curves(new_points_count, curves.curves_num());
+      MutableSpan<int> offsets = new_curves.offsets_for_write();
+      const MutableSpan<int8_t> new_types = new_curves.curve_types_for_write();

@@ -0,0 +167,4 @@
+      const MutableSpan<int8_t> new_types = new_curves.curve_types_for_write();
+      const VArray<int8_t> old_types = curves.curve_types();
+
+      CustomData_copy(

@@ -0,0 +179,4 @@
+      }
+
+      bke::MutableAttributeAccessor new_attributes = new_curves.attributes_for_write();
+      bke::MutableAttributeAccessor old_attributes = curves.attributes_for_write();

@@ -0,0 +193,4 @@
+          const int last = copy.intervals[i + 1];
+          const int size = last - first + 1;
+
+          copy_attributes(old_attributes, new_attributes, first, d, size);

@@ -0,0 +217,4 @@
+void CURVES_OT_extrude(wmOperatorType *ot)
+{
+  ot->name = "Extrude";
+  ot->idname = __func__;

@@ -0,0 +156,4 @@
+    curve_intervals_[interval_offset_ + ins] = last_elem;
+    ins++;
+  }
+  // check for extrusion from one point

@@ -0,0 +208,4 @@
+  const Span<int> old_offsets = curves.offsets();
+  CurvesExtrusion curves_copy(old_offsets, extruded_points);
+
+  bke::CurvesGeometry new_curves(curves_copy.curve_offsets().last(), curves.curves_num());

@@ -0,0 +214,4 @@
+  offsets.copy_from(curves_copy.curve_offsets());
+
+  int d = 0;
+  const int *curve_intervals = curves_copy.curve_intervals();

@@ -0,0 +247,4 @@
+        const GVArraySpan src = (*src_attributes.lookup(id, meta_data.domain));
+
+        if (meta_data.domain == ATTR_DOMAIN_POINT) {
+          d = 0;

@@ -0,0 +13,4 @@
+
+namespace blender::ed::curves {
+/* Stores information need to create new curves by copying data from original ones. */
+struct CurvesCopy {

@@ -0,0 +121,4 @@
+
+void finish_curve(int &curve_index,
+                  int &interval_offset,
+                  int ins,

@@ -0,0 +144,4 @@
+  curve_index++;
+}
+
+void finish_curve_or_shallow_copy(int &curve_index,

@@ -0,0 +146,4 @@
+
+void finish_curve_or_shallow_copy(int &curve_index,
+                                  int &interval_offset,
+                                  int ins,

@@ -0,0 +216,4 @@
+{
+  Object *obedit = CTX_data_edit_object(C);
+  Curves *curves_id = static_cast<Curves *>(obedit->data);
+  const bke::AttrDomain selection_domain = bke::AttrDomain(curves_id->selection_domain);

@@ -0,0 +227,4 @@
+    return OPERATOR_FINISHED;
+  }
+
+  bke::CurvesGeometry &curves = curves_id->geometry.wrap();

@@ -0,0 +238,4 @@
+  bke::CurvesGeometry new_curves = bke::curves::copy_only_curve_domain(curves);
+  new_curves.resize(curve_offsets.last(), curves.curves_num());
+
+  MutableSpan<int> offsets = new_curves.offsets_for_write();

@@ -0,0 +246,4 @@
+                                     curves_copy.curve_intervals.size()};
+
+  bke::GSpanAttributeWriter selection = ensure_selection_attribute(
+      new_curves, selection_domain, CD_PROP_BOOL);

@@ -0,0 +249,4 @@
+      new_curves, selection_domain, CD_PROP_BOOL);
+
+  threading::parallel_for(curves.curves_range(), 256, [&](IndexRange curves_range) {
+    for (const int c : curves_range) {

@@ -0,0 +288,4 @@
+    });
+    attribute.dst.finish();
+  }
+  new_curves.update_curve_types();

@@ -0,0 +290,4 @@
+  }
+  new_curves.update_curve_types();
+
+  curves_id->geometry.wrap() = new_curves;