armature_add.cc

Go to the documentation of this file.

/* SPDX-FileCopyrightText: 2001-2002 NaN Holding BV. All rights reserved.
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */
 
#include "DNA_anim_types.h"
#include "DNA_armature_types.h"
#include "DNA_constraint_types.h"
#include "DNA_object_types.h"
#include "DNA_scene_types.h"
 
#include "MEM_guardedalloc.h"
 
#include "BLI_blenlib.h"
#include "BLI_ghash.h"
#include "BLI_math_matrix.h"
#include "BLI_math_rotation.h"
#include "BLI_math_vector.h"
#include "BLI_string_utils.hh"
 
#include "BLT_translation.hh"
 
#include "BKE_action.hh"
#include "BKE_armature.hh"
#include "BKE_constraint.h"
#include "BKE_context.hh"
#include "BKE_fcurve.hh"
#include "BKE_idprop.hh"
#include "BKE_layer.hh"
#include "BKE_lib_id.hh"
#include "BKE_object_types.hh"
 
#include "ANIM_action.hh"
 
#include "RNA_access.hh"
#include "RNA_define.hh"
 
#include "WM_api.hh"
#include "WM_types.hh"
 
#include "ED_armature.hh"
#include "ED_outliner.hh"
#include "ED_screen.hh"
#include "ED_view3d.hh"
 
#include "ANIM_bone_collections.hh"
 
#include "DEG_depsgraph.hh"
 
#include "armature_intern.hh"
 
using blender::Vector;
 
/* *************** Adding stuff in editmode *************** */
 
EditBone *ED_armature_ebone_add(bArmature *arm, const char *name)
{
  EditBone *bone = static_cast<EditBone *>(MEM_callocN(sizeof(EditBone), "eBone"));
 
  STRNCPY(bone->name, name);
  ED_armature_ebone_unique_name(arm->edbo, bone->name, nullptr);
 
  BLI_addtail(arm->edbo, bone);
 
  bone->flag |= BONE_TIPSEL;
  bone->weight = 1.0f;
  bone->dist = 0.25f;
  bone->xwidth = 0.1f;
  bone->zwidth = 0.1f;
  bone->rad_head = 0.10f;
  bone->rad_tail = 0.05f;
  bone->segments = 1;
 
  /* Bendy-Bone parameters */
  bone->roll1 = 0.0f;
  bone->roll2 = 0.0f;
  bone->curve_in_x = 0.0f;
  bone->curve_in_z = 0.0f;
  bone->curve_out_x = 0.0f;
  bone->curve_out_z = 0.0f;
  bone->ease1 = 1.0f;
  bone->ease2 = 1.0f;
 
  /* Prevent custom bone colors from having alpha zero.
   * Part of the fix for issue #115434. */
  bone->color.custom.solid[3] = 255;
  bone->color.custom.select[3] = 255;
  bone->color.custom.active[3] = 255;
 
  copy_v3_fl(bone->scale_in, 1.0f);
  copy_v3_fl(bone->scale_out, 1.0f);
 
  return bone;
}
 
EditBone *ED_armature_ebone_add_primitive(Object *obedit_arm, float length, bool view_aligned)
{
  bArmature *arm = static_cast<bArmature *>(obedit_arm->data);
  EditBone *bone;
 
  ED_armature_edit_deselect_all(obedit_arm);
 
  /* Create a bone */
  bone = ED_armature_ebone_add(arm, DATA_("Bone"));
 
  arm->act_edbone = bone;
 
  zero_v3(bone->head);
  zero_v3(bone->tail);
 
  bone->tail[view_aligned ? 1 : 2] = length;
 
  if (arm->runtime.active_collection) {
    ANIM_armature_bonecoll_assign_editbone(arm->runtime.active_collection, bone);
  }
 
  return bone;
}
 
static int armature_click_extrude_exec(bContext *C, wmOperator * /*op*/)
{
  bArmature *arm;
  EditBone *ebone, *newbone, *flipbone;
  float mat[3][3], imat[3][3];
  int a, to_root = 0;
  Object *obedit;
  Scene *scene;
 
  scene = CTX_data_scene(C);
  obedit = CTX_data_edit_object(C);
  arm = static_cast<bArmature *>(obedit->data);
 
  /* find the active or selected bone */
  for (ebone = static_cast<EditBone *>(arm->edbo->first); ebone; ebone = ebone->next) {
    if (EBONE_VISIBLE(arm, ebone)) {
      if (ebone->flag & BONE_TIPSEL || arm->act_edbone == ebone) {
        break;
      }
    }
  }
 
  if (ebone == nullptr) {
    for (ebone = static_cast<EditBone *>(arm->edbo->first); ebone; ebone = ebone->next) {
      if (EBONE_VISIBLE(arm, ebone)) {
        if (ebone->flag & BONE_ROOTSEL || arm->act_edbone == ebone) {
          break;
        }
      }
    }
    if (ebone == nullptr) {
      return OPERATOR_CANCELLED;
    }
 
    to_root = 1;
  }
 
  ED_armature_edit_deselect_all(obedit);
 
  /* we re-use code for mirror editing... */
  flipbone = nullptr;
  if (arm->flag & ARM_MIRROR_EDIT) {
    flipbone = ED_armature_ebone_get_mirrored(arm->edbo, ebone);
  }
 
  for (a = 0; a < 2; a++) {
    if (a == 1) {
      if (flipbone == nullptr) {
        break;
      }
      std::swap(flipbone, ebone);
    }
 
    newbone = ED_armature_ebone_add(arm, ebone->name);
    arm->act_edbone = newbone;
 
    if (to_root) {
      copy_v3_v3(newbone->head, ebone->head);
      newbone->rad_head = ebone->rad_tail;
      newbone->parent = ebone->parent;
    }
    else {
      copy_v3_v3(newbone->head, ebone->tail);
      newbone->rad_head = ebone->rad_tail;
      newbone->parent = ebone;
      newbone->flag |= BONE_CONNECTED;
    }
 
    const View3DCursor *curs = &scene->cursor;
    copy_v3_v3(newbone->tail, curs->location);
    sub_v3_v3v3(newbone->tail, newbone->tail, obedit->object_to_world().location());
 
    if (a == 1) {
      newbone->tail[0] = -newbone->tail[0];
    }
 
    copy_m3_m4(mat, obedit->object_to_world().ptr());
    invert_m3_m3(imat, mat);
    mul_m3_v3(imat, newbone->tail);
 
    newbone->length = len_v3v3(newbone->head, newbone->tail);
    newbone->rad_tail = newbone->length * 0.05f;
    newbone->dist = newbone->length * 0.25f;
  }
 
  ED_armature_edit_sync_selection(arm->edbo);
 
  WM_event_add_notifier(C, NC_OBJECT | ND_BONE_SELECT, obedit);
  DEG_id_tag_update(&obedit->id, ID_RECALC_SELECT);
  ED_outliner_select_sync_from_edit_bone_tag(C);
 
  return OPERATOR_FINISHED;
}
 
static int armature_click_extrude_invoke(bContext *C, wmOperator *op, const wmEvent *event)
{
  /* TODO: most of this code is copied from set3dcursor_invoke,
   * it would be better to reuse code in set3dcursor_invoke */
 
  /* temporarily change 3d cursor position */
  Scene *scene;
  ARegion *region;
  View3D *v3d;
  float tvec[3], oldcurs[3], mval_f[2];
 
  scene = CTX_data_scene(C);
  region = CTX_wm_region(C);
  v3d = CTX_wm_view3d(C);
 
  View3DCursor *cursor = &scene->cursor;
 
  copy_v3_v3(oldcurs, cursor->location);
 
  copy_v2fl_v2i(mval_f, event->mval);
  ED_view3d_win_to_3d(v3d, region, cursor->location, mval_f, tvec);
  copy_v3_v3(cursor->location, tvec);
 
  /* extrude to the where new cursor is and store the operation result */
  int retval = armature_click_extrude_exec(C, op);
 
  /* restore previous 3d cursor position */
  copy_v3_v3(cursor->location, oldcurs);
 
  /* Support dragging to move after extrude, see: #114282. */
  if (retval & OPERATOR_FINISHED) {
    retval |= OPERATOR_PASS_THROUGH;
  }
  return WM_operator_flag_only_pass_through_on_press(retval, event);
}
 
void ARMATURE_OT_click_extrude(wmOperatorType *ot)
{
  /* identifiers */
  ot->name = "Extrude to Cursor";
  ot->idname = "ARMATURE_OT_click_extrude";
  ot->description = "Create a new bone going from the last selected joint to the mouse position";
 
  /* api callbacks */
  ot->invoke = armature_click_extrude_invoke;
  ot->exec = armature_click_extrude_exec;
  ot->poll = ED_operator_editarmature;
 
  /* flags */
  ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO | OPTYPE_DEPENDS_ON_CURSOR;
 
  /* props */
}
 
EditBone *add_points_bone(Object *obedit, float head[3], float tail[3])
{
  EditBone *ebo;
 
  ebo = ED_armature_ebone_add(static_cast<bArmature *>(obedit->data), DATA_("Bone"));
 
  copy_v3_v3(ebo->head, head);
  copy_v3_v3(ebo->tail, tail);
 
  return ebo;
}
 
static EditBone *get_named_editbone(ListBase *edbo, const char *name)
{
  if (name) {
    LISTBASE_FOREACH (EditBone *, eBone, edbo) {
      if (STREQ(name, eBone->name)) {
        return eBone;
      }
    }
  }
 
  return nullptr;
}
 
void preEditBoneDuplicate(ListBase *editbones)
{
  /* clear temp */
  ED_armature_ebone_listbase_temp_clear(editbones);
}
 
static bPoseChannel *pchan_duplicate_map(const bPose *pose,
                                         GHash *name_map,
                                         bPoseChannel *pchan_src)
{
  bPoseChannel *pchan_dst = nullptr;
  const char *name_src = pchan_src->name;
  const char *name_dst = static_cast<const char *>(BLI_ghash_lookup(name_map, name_src));
  if (name_dst) {
    pchan_dst = BKE_pose_channel_find_name(pose, name_dst);
  }
 
  if (pchan_dst == nullptr) {
    pchan_dst = pchan_src;
  }
 
  return pchan_dst;
}
 
void postEditBoneDuplicate(ListBase *editbones, Object *ob)
{
  if (ob->pose == nullptr) {
    return;
  }
 
  BKE_pose_channels_hash_free(ob->pose);
  BKE_pose_channels_hash_ensure(ob->pose);
 
  GHash *name_map = BLI_ghash_str_new(__func__);
 
  LISTBASE_FOREACH (EditBone *, ebone_src, editbones) {
    EditBone *ebone_dst = ebone_src->temp.ebone;
    if (!ebone_dst) {
      ebone_dst = ED_armature_ebone_get_mirrored(editbones, ebone_src);
    }
 
    if (ebone_dst) {
      BLI_ghash_insert(name_map, ebone_src->name, ebone_dst->name);
    }
  }
 
  LISTBASE_FOREACH (EditBone *, ebone_src, editbones) {
    EditBone *ebone_dst = ebone_src->temp.ebone;
    if (!ebone_dst) {
      continue;
    }
 
    bPoseChannel *pchan_src = BKE_pose_channel_find_name(ob->pose, ebone_src->name);
    if (!pchan_src) {
      continue;
    }
 
    bPoseChannel *pchan_dst = BKE_pose_channel_find_name(ob->pose, ebone_dst->name);
    if (!pchan_dst) {
      continue;
    }
 
    if (pchan_src->custom_tx) {
      pchan_dst->custom_tx = pchan_duplicate_map(ob->pose, name_map, pchan_src->custom_tx);
    }
    if (pchan_src->bbone_prev) {
      pchan_dst->bbone_prev = pchan_duplicate_map(ob->pose, name_map, pchan_src->bbone_prev);
    }
    if (pchan_src->bbone_next) {
      pchan_dst->bbone_next = pchan_duplicate_map(ob->pose, name_map, pchan_src->bbone_next);
    }
  }
 
  BLI_ghash_free(name_map, nullptr, nullptr);
}
 
static void updateDuplicateSubtarget(EditBone *dup_bone,
                                     ListBase *editbones,
                                     Object *ob,
                                     bool lookup_mirror_subtarget)
{
  /* If an edit bone has been duplicated, lets update its constraints if the
   * subtarget they point to has also been duplicated.
   */
  EditBone *oldtarget, *newtarget;
  bPoseChannel *pchan;
 
  if ((pchan = BKE_pose_channel_ensure(ob->pose, dup_bone->name))) {
    ListBase *conlist = &pchan->constraints;
    LISTBASE_FOREACH (bConstraint *, curcon, conlist) {
      /* does this constraint have a subtarget in
       * this armature?
       */
      ListBase targets = {nullptr, nullptr};
 
      if (BKE_constraint_targets_get(curcon, &targets)) {
        LISTBASE_FOREACH (bConstraintTarget *, ct, &targets) {
          if ((ct->tar == ob) && (ct->subtarget[0])) {
            oldtarget = get_named_editbone(editbones, ct->subtarget);
            if (oldtarget) {
              /* was the subtarget bone duplicated too? If
               * so, update the constraint to point at the
               * duplicate of the old subtarget.
               */
              if (oldtarget->temp.ebone) {
                newtarget = oldtarget->temp.ebone;
                STRNCPY(ct->subtarget, newtarget->name);
              }
              else if (lookup_mirror_subtarget) {
                /* The subtarget was not selected for duplication, try to see if a mirror bone of
                 * the current target exists */
                char name_flip[MAXBONENAME];
 
                BLI_string_flip_side_name(name_flip, oldtarget->name, false, sizeof(name_flip));
                newtarget = get_named_editbone(editbones, name_flip);
                if (newtarget) {
                  STRNCPY(ct->subtarget, newtarget->name);
                }
              }
            }
          }
        }
 
        BKE_constraint_targets_flush(curcon, &targets, false);
      }
    }
  }
}
 
static void updateDuplicateActionConstraintSettings(
    EditBone *dup_bone, EditBone *orig_bone, Object *ob, bPoseChannel *pchan, bConstraint *curcon)
{
  bActionConstraint *act_con = (bActionConstraint *)curcon->data;
 
  float mat[4][4];
 
  bConstraintOb cob{};
  cob.depsgraph = nullptr;
  cob.scene = nullptr;
  cob.ob = ob;
  cob.pchan = pchan;
  BKE_constraint_custom_object_space_init(&cob, curcon);
 
  unit_m4(mat);
  bPoseChannel *target_pchan = BKE_pose_channel_find_name(ob->pose, act_con->subtarget);
  BKE_constraint_mat_convertspace(
      ob, target_pchan, &cob, mat, curcon->tarspace, CONSTRAINT_SPACE_LOCAL, false);
 
  float max_axis_val = 0;
  int max_axis = 0;
  /* Which axis represents X now. IE, which axis defines the mirror plane. */
  for (int i = 0; i < 3; i++) {
    float cur_val = fabsf(mat[0][i]);
    if (cur_val > max_axis_val) {
      max_axis = i;
      max_axis_val = cur_val;
    }
  }
 
  /* data->type is mapped as follows for backwards compatibility:
   * 00,01,02 - rotation (it used to be like this)
   * 10,11,12 - scaling
   * 20,21,22 - location
   */
  /* Mirror the target range */
  if (act_con->type < 10 && act_con->type != max_axis) {
    /* Y or Z rotation */
    act_con->min = -act_con->min;
    act_con->max = -act_con->max;
  }
  else if (act_con->type == max_axis + 10) {
    /* X scaling */
  }
  else if (act_con->type == max_axis + 20) {
    /* X location */
    float imat[4][4];
 
    invert_m4_m4(imat, mat);
 
    float min_vec[3], max_vec[3];
 
    zero_v3(min_vec);
    zero_v3(max_vec);
 
    min_vec[0] = act_con->min;
    max_vec[0] = act_con->max;
 
    /* convert values into local object space */
    mul_m4_v3(mat, min_vec);
    mul_m4_v3(mat, max_vec);
 
    min_vec[0] *= -1;
    max_vec[0] *= -1;
 
    /* convert back to the settings space */
    mul_m4_v3(imat, min_vec);
    mul_m4_v3(imat, max_vec);
 
    act_con->min = min_vec[0];
    act_con->max = max_vec[0];
  }
 
  /* See if there is any channels that uses this bone */
  bAction *act = (bAction *)act_con->act;
  if (act) {
    blender::animrig::Action &action = act->wrap();
    blender::animrig::ChannelBag *cbag = blender::animrig::channelbag_for_action_slot(
        action, act_con->action_slot_handle);
 
    /* Create a copy and mirror the animation */
    auto bone_name_filter = [&](const FCurve &fcurve) -> bool {
      return blender::animrig::fcurve_matches_collection_path(
          fcurve, "pose.bones[", orig_bone->name);
    };
    Vector<FCurve *> fcurves = blender::animrig::fcurves_in_action_slot_filtered(
        act, act_con->action_slot_handle, bone_name_filter);
    for (const FCurve *old_curve : fcurves) {
      FCurve *new_curve = BKE_fcurve_copy(old_curve);
      char *old_path = new_curve->rna_path;
 
      new_curve->rna_path = BLI_string_replaceN(old_path, orig_bone->name, dup_bone->name);
      MEM_freeN(old_path);
 
      /* FIXME: deal with the case where this F-Curve already exists. */
 
      /* Flip the animation */
      int i;
      BezTriple *bezt;
      for (i = 0, bezt = new_curve->bezt; i < new_curve->totvert; i++, bezt++) {
        const size_t slength = strlen(new_curve->rna_path);
        bool flip = false;
        if (BLI_strn_endswith(new_curve->rna_path, "location", slength) &&
            new_curve->array_index == 0)
        {
          flip = true;
        }
        else if (BLI_strn_endswith(new_curve->rna_path, "rotation_quaternion", slength) &&
                 ELEM(new_curve->array_index, 2, 3))
        {
          flip = true;
        }
        else if (BLI_strn_endswith(new_curve->rna_path, "rotation_euler", slength) &&
                 ELEM(new_curve->array_index, 1, 2))
        {
          flip = true;
        }
        else if (BLI_strn_endswith(new_curve->rna_path, "rotation_axis_angle", slength) &&
                 ELEM(new_curve->array_index, 2, 3))
        {
          flip = true;
        }
 
        if (flip) {
          bezt->vec[0][1] *= -1;
          bezt->vec[1][1] *= -1;
          bezt->vec[2][1] *= -1;
        }
      }
 
      if (action.is_action_legacy()) {
        /* Make sure that a action group name for the new bone exists */
        bActionGroup *agrp = BKE_action_group_find_name(act, dup_bone->name);
        if (agrp == nullptr) {
          agrp = action_groups_add_new(act, dup_bone->name);
        }
        BLI_assert(agrp != nullptr);
        action_groups_add_channel(act, agrp, new_curve);
        continue;
      }
 
      BLI_assert_msg(cbag, "If there are F-Curves for this slot, there should be a channelbag");
      bActionGroup &agrp = cbag->channel_group_ensure(dup_bone->name);
      cbag->fcurve_append(*new_curve);
      cbag->fcurve_assign_to_channel_group(*new_curve, agrp);
    }
  }
 
  /* Make depsgraph aware of our changes. */
  DEG_id_tag_update(&act->id, ID_RECALC_ANIMATION_NO_FLUSH);
}
 
static void updateDuplicateKinematicConstraintSettings(bConstraint *curcon)
{
  /* IK constraint */
  bKinematicConstraint *ik = (bKinematicConstraint *)curcon->data;
  ik->poleangle = -M_PI - ik->poleangle;
  /* Wrap the angle to the +/-180.0f range (default soft limit of the input boxes). */
  ik->poleangle = angle_wrap_rad(ik->poleangle);
}
 
static void updateDuplicateLocRotConstraintSettings(Object *ob,
                                                    bPoseChannel *pchan,
                                                    bConstraint *curcon)
{
  /* This code assumes that bRotLimitConstraint and bLocLimitConstraint have the same fields in
   * the same memory locations. */
  bRotLimitConstraint *limit = (bRotLimitConstraint *)curcon->data;
  float local_mat[4][4], imat[4][4];
 
  float min_vec[3], max_vec[3];
 
  min_vec[0] = limit->xmin;
  min_vec[1] = limit->ymin;
  min_vec[2] = limit->zmin;
 
  max_vec[0] = limit->xmax;
  max_vec[1] = limit->ymax;
  max_vec[2] = limit->zmax;
 
  unit_m4(local_mat);
 
  bConstraintOb cob{};
  cob.depsgraph = nullptr;
  cob.scene = nullptr;
  cob.ob = ob;
  cob.pchan = pchan;
  BKE_constraint_custom_object_space_init(&cob, curcon);
 
  BKE_constraint_mat_convertspace(
      ob, pchan, &cob, local_mat, curcon->ownspace, CONSTRAINT_SPACE_LOCAL, false);
 
  if (curcon->type == CONSTRAINT_TYPE_ROTLIMIT) {
    /* Zero out any location translation */
    local_mat[3][0] = local_mat[3][1] = local_mat[3][2] = 0;
  }
 
  invert_m4_m4(imat, local_mat);
  /* convert values into local object space */
  mul_m4_v3(local_mat, min_vec);
  mul_m4_v3(local_mat, max_vec);
 
  if (curcon->type == CONSTRAINT_TYPE_ROTLIMIT) {
    float min_copy[3];
 
    copy_v3_v3(min_copy, min_vec);
 
    min_vec[1] = max_vec[1] * -1;
    min_vec[2] = max_vec[2] * -1;
 
    max_vec[1] = min_copy[1] * -1;
    max_vec[2] = min_copy[2] * -1;
  }
  else {
    float min_x_copy = min_vec[0];
 
    min_vec[0] = max_vec[0] * -1;
    max_vec[0] = min_x_copy * -1;
  }
 
  /* convert back to the settings space */
  mul_m4_v3(imat, min_vec);
  mul_m4_v3(imat, max_vec);
 
  limit->xmin = min_vec[0];
  limit->ymin = min_vec[1];
  limit->zmin = min_vec[2];
 
  limit->xmax = max_vec[0];
  limit->ymax = max_vec[1];
  limit->zmax = max_vec[2];
}
 
static void updateDuplicateTransformConstraintSettings(Object *ob,
                                                       bPoseChannel *pchan,
                                                       bConstraint *curcon)
{
  bTransformConstraint *trans = (bTransformConstraint *)curcon->data;
 
  float target_mat[4][4], own_mat[4][4], imat[4][4];
 
  bConstraintOb cob{};
  cob.depsgraph = nullptr;
  cob.scene = nullptr;
  cob.ob = ob;
  cob.pchan = pchan;
  BKE_constraint_custom_object_space_init(&cob, curcon);
 
  unit_m4(own_mat);
  BKE_constraint_mat_convertspace(
      ob, pchan, &cob, own_mat, curcon->ownspace, CONSTRAINT_SPACE_LOCAL, false);
 
  /* ###Source map mirroring### */
  float old_min, old_max;
 
  /* Source location */
  invert_m4_m4(imat, own_mat);
 
  /* convert values into local object space */
  mul_m4_v3(own_mat, trans->from_min);
  mul_m4_v3(own_mat, trans->from_max);
 
  old_min = trans->from_min[0];
  old_max = trans->from_max[0];
 
  trans->from_min[0] = -old_max;
  trans->from_max[0] = -old_min;
 
  /* convert back to the settings space */
  mul_m4_v3(imat, trans->from_min);
  mul_m4_v3(imat, trans->from_max);
 
  /* Source rotation */
 
  /* Zero out any location translation */
  own_mat[3][0] = own_mat[3][1] = own_mat[3][2] = 0;
 
  invert_m4_m4(imat, own_mat);
 
  /* convert values into local object space */
  mul_m4_v3(own_mat, trans->from_min_rot);
  mul_m4_v3(own_mat, trans->from_max_rot);
 
  old_min = trans->from_min_rot[1];
  old_max = trans->from_max_rot[1];
 
  trans->from_min_rot[1] = old_max * -1;
  trans->from_max_rot[1] = old_min * -1;
 
  old_min = trans->from_min_rot[2];
  old_max = trans->from_max_rot[2];
 
  trans->from_min_rot[2] = old_max * -1;
  trans->from_max_rot[2] = old_min * -1;
 
  /* convert back to the settings space */
  mul_m4_v3(imat, trans->from_min_rot);
  mul_m4_v3(imat, trans->from_max_rot);
 
  /* Source scale does not require any mirroring */
 
  /* ###Destination map mirroring### */
  float temp_vec[3];
  float imat_rot[4][4];
 
  bPoseChannel *target_pchan = BKE_pose_channel_find_name(ob->pose, trans->subtarget);
  unit_m4(target_mat);
  BKE_constraint_mat_convertspace(
      ob, target_pchan, &cob, target_mat, curcon->tarspace, CONSTRAINT_SPACE_LOCAL, false);
 
  invert_m4_m4(imat, target_mat);
  /* convert values into local object space */
  mul_m4_v3(target_mat, trans->to_min);
  mul_m4_v3(target_mat, trans->to_max);
  mul_m4_v3(target_mat, trans->to_min_scale);
  mul_m4_v3(target_mat, trans->to_max_scale);
 
  /* Zero out any location translation */
  target_mat[3][0] = target_mat[3][1] = target_mat[3][2] = 0;
  invert_m4_m4(imat_rot, target_mat);
 
  mul_m4_v3(target_mat, trans->to_min_rot);
  mul_m4_v3(target_mat, trans->to_max_rot);
 
  /* TODO(sebpa): This does not support euler order, but doing so will make this way more complex.
   * For now we have decided to not support all corner cases and advanced setups. */
 
  /* Helper variables to denote the axis in trans->map */
  const char X = 0;
  const char Y = 1;
  const char Z = 2;
 
  switch (trans->to) {
    case TRANS_SCALE:
      copy_v3_v3(temp_vec, trans->to_max_scale);
 
      for (int i = 0; i < 3; i++) {
        if ((trans->from == TRANS_LOCATION && trans->map[i] == X) ||
            (trans->from == TRANS_ROTATION && trans->map[i] != X))
        {
          /* X Loc to X/Y/Z Scale: Min/Max Flipped */
          /* Y Rot to X/Y/Z Scale: Min/Max Flipped */
          /* Z Rot to X/Y/Z Scale: Min/Max Flipped */
          trans->to_max_scale[i] = trans->to_min_scale[i];
          trans->to_min_scale[i] = temp_vec[i];
        }
      }
      break;
    case TRANS_LOCATION:
      /* Invert the X location */
      trans->to_min[0] *= -1;
      trans->to_max[0] *= -1;
 
      copy_v3_v3(temp_vec, trans->to_max);
 
      for (int i = 0; i < 3; i++) {
        if ((trans->from == TRANS_LOCATION && trans->map[i] == X) ||
            (trans->from == TRANS_ROTATION && trans->map[i] != X))
        {
          /* X Loc to X/Y/Z Loc: Min/Max Flipped (and Inverted)
           * Y Rot to X/Y/Z Loc: Min/Max Flipped
           * Z Rot to X/Y/Z Loc: Min/Max Flipped */
          trans->to_max[i] = trans->to_min[i];
          trans->to_min[i] = temp_vec[i];
        }
      }
      break;
    case TRANS_ROTATION:
      /* Invert the Z rotation */
      trans->to_min_rot[2] *= -1;
      trans->to_max_rot[2] *= -1;
 
      if ((trans->from == TRANS_LOCATION && trans->map[1] != X) ||
          (trans->from == TRANS_ROTATION && trans->map[1] != Y) || trans->from == TRANS_SCALE)
      {
        /* Invert the Y rotation */
        trans->to_min_rot[1] *= -1;
        trans->to_max_rot[1] *= -1;
      }
 
      copy_v3_v3(temp_vec, trans->to_max_rot);
 
      for (int i = 0; i < 3; i++) {
        if ((trans->from == TRANS_LOCATION && trans->map[i] == X && i != 1) ||
            (trans->from == TRANS_ROTATION && trans->map[i] == Y && i != 1) ||
            (trans->from == TRANS_ROTATION && trans->map[i] == Z))
        {
          /* X Loc to X/Z Rot: Flipped
           * Y Rot to X/Z Rot: Flipped
           * Z Rot to X/Y/Z rot: Flipped */
          trans->to_max_rot[i] = trans->to_min_rot[i];
          trans->to_min_rot[i] = temp_vec[i];
        }
      }
 
      if (trans->from == TRANS_ROTATION && trans->map[1] == Y) {
        /* Y Rot to Y Rot: Flip and invert */
        trans->to_max_rot[1] = -trans->to_min_rot[1];
        trans->to_min_rot[1] = -temp_vec[1];
      }
 
      break;
  }
  /* convert back to the settings space */
  mul_m4_v3(imat, trans->to_min);
  mul_m4_v3(imat, trans->to_max);
  mul_m4_v3(imat_rot, trans->to_min_rot);
  mul_m4_v3(imat_rot, trans->to_max_rot);
  mul_m4_v3(imat, trans->to_min_scale);
  mul_m4_v3(imat, trans->to_max_scale);
}
 
static void track_axis_x_swap(int &value)
{
  /* Swap track axis X <> -X. */
  if (value == TRACK_X) {
    value = TRACK_nX;
  }
  else if (value == TRACK_nX) {
    value = TRACK_X;
  }
}
 
static void track_axis_x_swap(char &value)
{
  /* Swap track axis X <> -X. */
  if (value == TRACK_X) {
    value = TRACK_nX;
  }
  else if (value == TRACK_nX) {
    value = TRACK_X;
  }
}
 
static void updateDuplicateConstraintTrackToSettings(bConstraint *curcon)
{
  bTrackToConstraint *data = static_cast<bTrackToConstraint *>(curcon->data);
  track_axis_x_swap(data->reserved1);
}
 
static void updateDuplicateConstraintLockTrackSettings(bConstraint *curcon)
{
  bLockTrackConstraint *data = static_cast<bLockTrackConstraint *>(curcon->data);
  track_axis_x_swap(data->trackflag);
}
 
static void updateDuplicateConstraintDampTrackSettings(bConstraint *curcon)
{
  bDampTrackConstraint *data = static_cast<bDampTrackConstraint *>(curcon->data);
  track_axis_x_swap(data->trackflag);
}
 
static void updateDuplicateConstraintShrinkwrapSettings(bConstraint *curcon)
{
  bShrinkwrapConstraint *data = static_cast<bShrinkwrapConstraint *>(curcon->data);
  track_axis_x_swap(data->trackAxis);
}
 
static void updateDuplicateConstraintSettings(EditBone *dup_bone, EditBone *orig_bone, Object *ob)
{
  /* If an edit bone has been duplicated, lets update its constraints if the
   * subtarget they point to has also been duplicated.
   */
  bPoseChannel *pchan;
  ListBase *conlist;
 
  if ((pchan = BKE_pose_channel_ensure(ob->pose, dup_bone->name)) == nullptr ||
      (conlist = &pchan->constraints) == nullptr)
  {
    return;
  }
 
  LISTBASE_FOREACH (bConstraint *, curcon, conlist) {
    switch (curcon->type) {
      case CONSTRAINT_TYPE_ACTION:
        updateDuplicateActionConstraintSettings(dup_bone, orig_bone, ob, pchan, curcon);
        break;
      case CONSTRAINT_TYPE_KINEMATIC:
        updateDuplicateKinematicConstraintSettings(curcon);
        break;
      case CONSTRAINT_TYPE_LOCLIMIT:
      case CONSTRAINT_TYPE_ROTLIMIT:
        updateDuplicateLocRotConstraintSettings(ob, pchan, curcon);
        break;
      case CONSTRAINT_TYPE_TRANSFORM:
        updateDuplicateTransformConstraintSettings(ob, pchan, curcon);
        break;
      case CONSTRAINT_TYPE_TRACKTO:
        updateDuplicateConstraintTrackToSettings(curcon);
        break;
      case CONSTRAINT_TYPE_LOCKTRACK:
        updateDuplicateConstraintLockTrackSettings(curcon);
        break;
      case CONSTRAINT_TYPE_DAMPTRACK:
        updateDuplicateConstraintDampTrackSettings(curcon);
        break;
      case CONSTRAINT_TYPE_SHRINKWRAP:
        updateDuplicateConstraintShrinkwrapSettings(curcon);
        break;
    }
  }
}
 
static void updateDuplicateCustomBoneShapes(bContext *C, EditBone *dup_bone, Object *ob)
{
  if (ob->pose == nullptr) {
    return;
  }
  bPoseChannel *pchan;
  pchan = BKE_pose_channel_ensure(ob->pose, dup_bone->name);
 
  if (pchan->custom != nullptr) {
    Main *bmain = CTX_data_main(C);
    char name_flip[MAX_ID_NAME - 2];
 
    /* Invert the X location */
    pchan->custom_translation[0] *= -1;
    /* Invert the Y rotation */
    pchan->custom_rotation_euler[1] *= -1;
    /* Invert the Z rotation */
    pchan->custom_rotation_euler[2] *= -1;
 
    /* Skip the first two chars in the object name as those are used to store object type */
    BLI_string_flip_side_name(name_flip, pchan->custom->id.name + 2, false, sizeof(name_flip));
    Object *shape_ob = (Object *)BKE_libblock_find_name(bmain, ID_OB, name_flip);
 
    /* If name_flip doesn't exist, BKE_libblock_find_name() returns pchan->custom (best match) */
    shape_ob = shape_ob == pchan->custom ? nullptr : shape_ob;
 
    if (shape_ob != nullptr) {
      /* A flipped shape object exists, use it! */
      pchan->custom = shape_ob;
    }
    else {
      /* Flip shape */
      pchan->custom_scale_xyz[0] *= -1;
    }
  }
}
 
/* Properties should be added on a case by case basis whenever needed to avoid mirroring things
 * that shouldn't be mirrored. */
static void mirror_pose_bone(Object &ob, EditBone &ebone)
{
  bPoseChannel *pose_bone = BKE_pose_channel_find_name(ob.pose, ebone.name);
  BLI_assert(pose_bone);
  float limit_min = pose_bone->limitmin[2];
  pose_bone->limitmin[2] = -pose_bone->limitmax[2];
  pose_bone->limitmax[2] = -limit_min;
}
 
static void copy_pchan(EditBone *src_bone, EditBone *dst_bone, Object *src_ob, Object *dst_ob)
{
  /* copy the ID property */
  if (src_bone->prop) {
    dst_bone->prop = IDP_CopyProperty(src_bone->prop);
  }
 
  /* Lets duplicate the list of constraints that the
   * current bone has.
   */
  if (src_ob->pose) {
    bPoseChannel *chanold, *channew;
 
    chanold = BKE_pose_channel_ensure(src_ob->pose, src_bone->name);
    if (chanold) {
      /* WARNING: this creates a new posechannel, but there will not be an attached bone
       * yet as the new bones created here are still 'EditBones' not 'Bones'.
       */
      channew = BKE_pose_channel_ensure(dst_ob->pose, dst_bone->name);
 
      if (channew) {
        BKE_pose_channel_copy_data(channew, chanold);
      }
    }
  }
}
 
void ED_armature_ebone_copy(EditBone *dest, const EditBone *source)
{
  memcpy(dest, source, sizeof(*dest));
  BLI_duplicatelist(&dest->bone_collections, &dest->bone_collections);
}
 
EditBone *duplicateEditBoneObjects(
    EditBone *cur_bone, const char *name, ListBase *editbones, Object *src_ob, Object *dst_ob)
{
  EditBone *e_bone = static_cast<EditBone *>(MEM_mallocN(sizeof(EditBone), "addup_editbone"));
 
  /* Copy data from old bone to new bone */
  ED_armature_ebone_copy(e_bone, cur_bone);
 
  cur_bone->temp.ebone = e_bone;
  e_bone->temp.ebone = cur_bone;
 
  if (name != nullptr) {
    STRNCPY(e_bone->name, name);
  }
 
  ED_armature_ebone_unique_name(editbones, e_bone->name, nullptr);
  BLI_addtail(editbones, e_bone);
 
  copy_pchan(cur_bone, e_bone, src_ob, dst_ob);
 
  return e_bone;
}
 
EditBone *duplicateEditBone(EditBone *cur_bone, const char *name, ListBase *editbones, Object *ob)
{
  return duplicateEditBoneObjects(cur_bone, name, editbones, ob, ob);
}
 
static int armature_duplicate_selected_exec(bContext *C, wmOperator *op)
{
  const Scene *scene = CTX_data_scene(C);
  ViewLayer *view_layer = CTX_data_view_layer(C);
  const bool do_flip_names = RNA_boolean_get(op->ptr, "do_flip_names");
 
  /* cancel if nothing selected */
  if (CTX_DATA_COUNT(C, selected_bones) == 0) {
    return OPERATOR_CANCELLED;
  }
 
  Vector<Object *> objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
      scene, view_layer, CTX_wm_view3d(C));
  for (Object *ob : objects) {
    EditBone *ebone_iter;
    /* The beginning of the duplicated bones in the edbo list */
    EditBone *ebone_first_dupe = nullptr;
 
    bArmature *arm = static_cast<bArmature *>(ob->data);
 
    ED_armature_edit_sync_selection(arm->edbo); /* XXX why is this needed? */
 
    preEditBoneDuplicate(arm->edbo);
 
    /* Select mirrored bones */
    if (arm->flag & ARM_MIRROR_EDIT) {
      LISTBASE_FOREACH (EditBone *, ebone_iter, arm->edbo) {
        if (EBONE_VISIBLE(arm, ebone_iter) && (ebone_iter->flag & BONE_SELECTED)) {
          EditBone *ebone;
 
          ebone = ED_armature_ebone_get_mirrored(arm->edbo, ebone_iter);
          if (ebone) {
            ebone->flag |= BONE_SELECTED;
          }
        }
      }
    }
 
    /* Find the selected bones and duplicate them as needed */
    for (ebone_iter = static_cast<EditBone *>(arm->edbo->first);
         ebone_iter && ebone_iter != ebone_first_dupe;
         ebone_iter = ebone_iter->next)
    {
      if (EBONE_VISIBLE(arm, ebone_iter) && (ebone_iter->flag & BONE_SELECTED)) {
        EditBone *ebone;
        char new_bone_name_buff[MAXBONENAME];
        char *new_bone_name = ebone_iter->name;
 
        if (do_flip_names) {
          BLI_string_flip_side_name(
              new_bone_name_buff, ebone_iter->name, false, sizeof(new_bone_name_buff));
 
          /* Only use flipped name if not yet in use. Otherwise we'd get again inconsistent
           * namings (different numbers), better keep default behavior in this case. */
          if (ED_armature_ebone_find_name(arm->edbo, new_bone_name_buff) == nullptr) {
            new_bone_name = new_bone_name_buff;
          }
        }
 
        ebone = duplicateEditBone(ebone_iter, new_bone_name, arm->edbo, ob);
 
        if (!ebone_first_dupe) {
          ebone_first_dupe = ebone;
        }
      }
    }
 
    /* Run though the list and fix the pointers */
    for (ebone_iter = static_cast<EditBone *>(arm->edbo->first);
         ebone_iter && ebone_iter != ebone_first_dupe;
         ebone_iter = ebone_iter->next)
    {
      if (EBONE_VISIBLE(arm, ebone_iter) && (ebone_iter->flag & BONE_SELECTED)) {
        EditBone *ebone = ebone_iter->temp.ebone;
 
        if (!ebone_iter->parent) {
          /* If this bone has no parent,
           * Set the duplicate->parent to nullptr
           */
          ebone->parent = nullptr;
        }
        else if (ebone_iter->parent->temp.ebone) {
          /* If this bone has a parent that was duplicated,
           * Set the duplicate->parent to the cur_bone->parent->temp
           */
          ebone->parent = ebone_iter->parent->temp.ebone;
        }
        else {
          /* If this bone has a parent that IS not selected,
           * Set the duplicate->parent to the cur_bone->parent
           */
          ebone->parent = (EditBone *)ebone_iter->parent;
          ebone->flag &= ~BONE_CONNECTED;
        }
 
        /* Update custom handle links. */
        if (ebone_iter->bbone_prev && ebone_iter->bbone_prev->temp.ebone) {
          ebone->bbone_prev = ebone_iter->bbone_prev->temp.ebone;
        }
        if (ebone_iter->bbone_next && ebone_iter->bbone_next->temp.ebone) {
          ebone->bbone_next = ebone_iter->bbone_next->temp.ebone;
        }
 
        /* Lets try to fix any constraint sub-targets that might have been duplicated. */
        updateDuplicateSubtarget(ebone, arm->edbo, ob, false);
      }
    }
 
    /* correct the active bone */
    if (arm->act_edbone && arm->act_edbone->temp.ebone) {
      arm->act_edbone = arm->act_edbone->temp.ebone;
    }
 
    /* Deselect the old bones and select the new ones */
    for (ebone_iter = static_cast<EditBone *>(arm->edbo->first);
         ebone_iter && ebone_iter != ebone_first_dupe;
         ebone_iter = ebone_iter->next)
    {
      if (EBONE_VISIBLE(arm, ebone_iter)) {
        ebone_iter->flag &= ~(BONE_SELECTED | BONE_TIPSEL | BONE_ROOTSEL);
      }
    }
 
    postEditBoneDuplicate(arm->edbo, ob);
 
    WM_event_add_notifier(C, NC_OBJECT | ND_BONE_SELECT, ob);
    DEG_id_tag_update(&ob->id, ID_RECALC_SELECT);
  }
 
  ED_outliner_select_sync_from_edit_bone_tag(C);
 
  return OPERATOR_FINISHED;
}
 
void ARMATURE_OT_duplicate(wmOperatorType *ot)
{
  /* identifiers */
  ot->name = "Duplicate Selected Bone(s)";
  ot->idname = "ARMATURE_OT_duplicate";
  ot->description = "Make copies of the selected bones within the same armature";
 
  /* api callbacks */
  ot->exec = armature_duplicate_selected_exec;
  ot->poll = ED_operator_editarmature;
 
  /* flags */
  ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
 
  RNA_def_boolean(
      ot->srna,
      "do_flip_names",
      false,
      "Flip Names",
      "Try to flip names of the bones, if possible, instead of adding a number extension");
}
 
/* Get the duplicated or existing mirrored copy of the bone. */
static EditBone *get_symmetrized_bone(bArmature *arm, EditBone *bone)
{
  if (bone == nullptr) {
    return nullptr;
  }
  if (bone->temp.ebone != nullptr) {
    return bone->temp.ebone;
  }
 
  EditBone *mirror = ED_armature_ebone_get_mirrored(arm->edbo, bone);
  return (mirror != nullptr) ? mirror : bone;
}
 
static int armature_symmetrize_exec(bContext *C, wmOperator *op)
{
  const Scene *scene = CTX_data_scene(C);
  ViewLayer *view_layer = CTX_data_view_layer(C);
  const int direction = RNA_enum_get(op->ptr, "direction");
  const int axis = 0;
 
  /* cancel if nothing selected */
  if (CTX_DATA_COUNT(C, selected_bones) == 0) {
    return OPERATOR_CANCELLED;
  }
 
  Vector<Object *> objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
      scene, view_layer, CTX_wm_view3d(C));
  for (Object *obedit : objects) {
    EditBone *ebone_iter;
    /* The beginning of the duplicated mirrored bones in the edbo list */
    EditBone *ebone_first_dupe = nullptr;
 
    bArmature *arm = static_cast<bArmature *>(obedit->data);
 
    ED_armature_edit_sync_selection(arm->edbo); /* XXX why is this needed? */
 
    preEditBoneDuplicate(arm->edbo);
 
    /* Deselect ebones depending on input axis and direction.
     * A symmetrizable selection contains selected ebones of the input direction
     * and unique selected bones with an unique flippable name.
     *
     * Storing temp pointers to mirrored unselected ebones. */
    LISTBASE_FOREACH (EditBone *, ebone_iter, arm->edbo) {
      if (!(EBONE_VISIBLE(arm, ebone_iter) && (ebone_iter->flag & BONE_SELECTED))) {
        /* Skipping invisible selected bones. */
        continue;
      }
 
      char name_flip[MAXBONENAME];
      if (ebone_iter == nullptr) {
        continue;
      }
 
      BLI_string_flip_side_name(name_flip, ebone_iter->name, false, sizeof(name_flip));
 
      if (STREQ(name_flip, ebone_iter->name)) {
        /* Skipping ebones without flippable as they don't have the potential to be mirrored. */
        ebone_iter->flag &= ~(BONE_SELECTED | BONE_TIPSEL | BONE_ROOTSEL);
        continue;
      }
 
      EditBone *ebone = ED_armature_ebone_find_name(arm->edbo, name_flip);
 
      if (!ebone) {
        /* The ebone_iter is unique and mirror-able. */
        continue;
      }
 
      if (ebone->flag & BONE_SELECTED) {
        /* The mirrored ebone and the ebone_iter are selected.
         * Deselect based on the input direction and axis. */
        float axis_delta;
 
        axis_delta = ebone->head[axis] - ebone_iter->head[axis];
        if (axis_delta == 0.0f) {
          /* The ebone heads are overlapping. */
          axis_delta = ebone->tail[axis] - ebone_iter->tail[axis];
 
          if (axis_delta == 0.0f) {
            /* Both mirrored bones point to each other and overlap exactly.
             * In this case there's no well defined solution, so de-select both and skip. */
            ebone->flag &= ~(BONE_SELECTED | BONE_TIPSEL | BONE_ROOTSEL);
            ebone_iter->flag &= ~(BONE_SELECTED | BONE_TIPSEL | BONE_ROOTSEL);
            continue;
          }
        }
 
        /* Deselect depending on direction. */
        if (((axis_delta < 0.0f) ? -1 : 1) == direction) {
          /* Don't store temp ptr if the iter_bone gets deselected.
           * In this case, the ebone.temp should point to the ebone_iter. */
          ebone_iter->flag &= ~(BONE_SELECTED | BONE_TIPSEL | BONE_ROOTSEL);
          continue;
        }
 
        ebone->flag &= ~(BONE_SELECTED | BONE_TIPSEL | BONE_ROOTSEL);
      }
 
      /* Set temp pointer to mirrored ebones */
      ebone_iter->temp.ebone = ebone;
    }
 
    /* Find the selected bones and duplicate them as needed, with mirrored name. */
    for (ebone_iter = static_cast<EditBone *>(arm->edbo->first);
         ebone_iter && ebone_iter != ebone_first_dupe;
         ebone_iter = ebone_iter->next)
    {
      if (EBONE_VISIBLE(arm, ebone_iter) && (ebone_iter->flag & BONE_SELECTED)) {
        if (ebone_iter->temp.ebone != nullptr) {
          /* This will be set if the mirror bone already exists (no need to make a new one)
           * but we do need to make sure that the 'pchan' settings (constraints etc)
           * is synchronized. */
          bPoseChannel *pchan;
          /* Make sure we clean up the old data before overwriting it */
          pchan = BKE_pose_channel_ensure(obedit->pose, ebone_iter->temp.ebone->name);
          BKE_pose_channel_free(pchan);
          /* Sync pchan data */
          copy_pchan(ebone_iter, ebone_iter->temp.ebone, obedit, obedit);
          /* Sync scale mode */
          ebone_iter->temp.ebone->inherit_scale_mode = ebone_iter->inherit_scale_mode;
          continue;
        }
 
        char name_flip[MAXBONENAME];
 
        BLI_string_flip_side_name(name_flip, ebone_iter->name, false, sizeof(name_flip));
 
        /* mirrored bones must have a side-suffix */
        if (!STREQ(name_flip, ebone_iter->name)) {
          EditBone *ebone;
 
          ebone = duplicateEditBone(ebone_iter, name_flip, arm->edbo, obedit);
 
          if (!ebone_first_dupe) {
            ebone_first_dupe = ebone;
          }
        }
      }
    }
 
    /* Run through the list and fix the pointers. */
    for (ebone_iter = static_cast<EditBone *>(arm->edbo->first);
         ebone_iter && ebone_iter != ebone_first_dupe;
         ebone_iter = ebone_iter->next)
    {
      if (ebone_iter->temp.ebone) {
        /* copy all flags except for ... */
        const int flag_copy = int(~0) & ~(BONE_SELECTED | BONE_ROOTSEL | BONE_TIPSEL);
 
        EditBone *ebone = ebone_iter->temp.ebone;
 
        /* Copy flags in case bone is pre-existing data. */
        ebone->flag = (ebone->flag & ~flag_copy) | (ebone_iter->flag & flag_copy);
 
        if (ebone_iter->parent == nullptr) {
          /* If this bone has no parent,
           * Set the duplicate->parent to nullptr
           */
          ebone->parent = nullptr;
          ebone->flag &= ~BONE_CONNECTED;
        }
        else {
          /* the parent may have been duplicated, if not lookup the mirror parent */
          EditBone *ebone_parent = get_symmetrized_bone(arm, ebone_iter->parent);
 
          if (ebone_parent == ebone_iter->parent) {
            /* If the mirror lookup failed, (but the current bone has a parent)
             * then we can assume the parent has no L/R but is a center bone.
             * So just use the same parent for both.
             */
 
            if (ebone->head[axis] != 0.0f) {
              /* The mirrored bone doesn't start on the mirror axis, so assume that this one
               * should not be connected to the old parent */
              ebone->flag &= ~BONE_CONNECTED;
            }
          }
 
          ebone->parent = ebone_parent;
        }
 
        /* Update custom handle links. */
        ebone->bbone_prev = get_symmetrized_bone(arm, ebone_iter->bbone_prev);
        ebone->bbone_next = get_symmetrized_bone(arm, ebone_iter->bbone_next);
 
        /* Sync bbone handle types */
        ebone->bbone_prev_type = ebone_iter->bbone_prev_type;
        ebone->bbone_next_type = ebone_iter->bbone_next_type;
 
        ebone->bbone_mapping_mode = ebone_iter->bbone_mapping_mode;
        ebone->bbone_flag = ebone_iter->bbone_flag;
        ebone->bbone_prev_flag = ebone_iter->bbone_prev_flag;
        ebone->bbone_next_flag = ebone_iter->bbone_next_flag;
 
        /* Lets try to fix any constraint sub-targets that might have been duplicated. */
        updateDuplicateSubtarget(ebone, arm->edbo, obedit, true);
        /* Try to update constraint options so that they are mirrored as well
         * (need to supply bone_iter as well in case we are working with existing bones) */
        updateDuplicateConstraintSettings(ebone, ebone_iter, obedit);
        /* Mirror bone shapes if possible */
        updateDuplicateCustomBoneShapes(C, ebone, obedit);
        /* Mirror any settings on the pose bone. */
        mirror_pose_bone(*obedit, *ebone);
      }
    }
 
    ED_armature_edit_transform_mirror_update(obedit);
 
    /* Selected bones now have their 'temp' pointer set,
     * so we don't need this anymore */
 
    /* Deselect the old bones and select the new ones */
    for (ebone_iter = static_cast<EditBone *>(arm->edbo->first);
         ebone_iter && ebone_iter != ebone_first_dupe;
         ebone_iter = ebone_iter->next)
    {
      if (EBONE_VISIBLE(arm, ebone_iter)) {
        ebone_iter->flag &= ~(BONE_SELECTED | BONE_TIPSEL | BONE_ROOTSEL);
      }
    }
 
    /* New bones will be selected, but some of the bones may already exist */
    for (ebone_iter = static_cast<EditBone *>(arm->edbo->first);
         ebone_iter && ebone_iter != ebone_first_dupe;
         ebone_iter = ebone_iter->next)
    {
      EditBone *ebone = ebone_iter->temp.ebone;
      if (ebone && EBONE_SELECTABLE(arm, ebone)) {
        ED_armature_ebone_select_set(ebone, true);
      }
    }
 
    /* correct the active bone */
    if (arm->act_edbone && arm->act_edbone->temp.ebone) {
      arm->act_edbone = arm->act_edbone->temp.ebone;
    }
 
    postEditBoneDuplicate(arm->edbo, obedit);
 
    WM_event_add_notifier(C, NC_OBJECT | ND_BONE_SELECT, obedit);
    DEG_id_tag_update(&obedit->id, ID_RECALC_SELECT);
  }
 
  return OPERATOR_FINISHED;
}
 
void ARMATURE_OT_symmetrize(wmOperatorType *ot)
{
  /* NOTE: following conventions from #MESH_OT_symmetrize */
 
  /* subset of 'rna_enum_symmetrize_direction_items' */
  static const EnumPropertyItem arm_symmetrize_direction_items[] = {
      {-1, "NEGATIVE_X", 0, "-X to +X", ""},
      {+1, "POSITIVE_X", 0, "+X to -X", ""},
      {0, nullptr, 0, nullptr, nullptr},
  };
 
  /* identifiers */
  ot->name = "Symmetrize";
  ot->idname = "ARMATURE_OT_symmetrize";
  ot->description = "Enforce symmetry, make copies of the selection or use existing";
 
  /* api callbacks */
  ot->exec = armature_symmetrize_exec;
  ot->poll = ED_operator_editarmature;
 
  /* flags */
  ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
 
  ot->prop = RNA_def_enum(ot->srna,
                          "direction",
                          arm_symmetrize_direction_items,
                          -1,
                          "Direction",
                          "Which sides to copy from and to (when both are selected)");
}
 
/* ------------------------------------------ */
 
/* previously extrude_armature */
/* context; editmode armature */
/* if forked && mirror-edit: makes two bones with flipped names */
static int armature_extrude_exec(bContext *C, wmOperator *op)
{
  const Scene *scene = CTX_data_scene(C);
  ViewLayer *view_layer = CTX_data_view_layer(C);
  const bool forked = RNA_boolean_get(op->ptr, "forked");
  bool changed_multi = false;
  Vector<Object *> objects = BKE_view_layer_array_from_objects_in_edit_mode_unique_data(
      scene, view_layer, CTX_wm_view3d(C));
 
  enum ExtrudePoint {
    SKIP_EXTRUDE,
    TIP_EXTRUDE,
    ROOT_EXTRUDE,
  };
 
  for (Object *ob : objects) {
    bArmature *arm = static_cast<bArmature *>(ob->data);
    bool forked_iter = forked;
 
    EditBone *newbone = nullptr, *ebone, *flipbone, *first = nullptr;
    int a, totbone = 0;
    ExtrudePoint do_extrude;
 
    /* since we allow root extrude too, we have to make sure selection is OK */
    LISTBASE_FOREACH (EditBone *, ebone, arm->edbo) {
      if (EBONE_VISIBLE(arm, ebone)) {
        if (ebone->flag & BONE_ROOTSEL) {
          if (ebone->parent && (ebone->flag & BONE_CONNECTED)) {
            if (ebone->parent->flag & BONE_TIPSEL) {
              ebone->flag &= ~BONE_ROOTSEL;
            }
          }
        }
      }
    }
 
    /* Duplicate the necessary bones */
    for (ebone = static_cast<EditBone *>(arm->edbo->first); ((ebone) && (ebone != first));
         ebone = ebone->next)
    {
      if (EBONE_VISIBLE(arm, ebone)) {
        /* we extrude per definition the tip */
        do_extrude = SKIP_EXTRUDE;
        if (ebone->flag & (BONE_TIPSEL | BONE_SELECTED)) {
          do_extrude = TIP_EXTRUDE;
        }
        else if (ebone->flag & BONE_ROOTSEL) {
          /* but, a bone with parent deselected we do the root... */
          if (ebone->parent && (ebone->parent->flag & BONE_TIPSEL)) {
            /* pass */
          }
          else {
            do_extrude = ROOT_EXTRUDE;
          }
        }
 
        if (do_extrude) {
          /* we re-use code for mirror editing... */
          flipbone = nullptr;
          if (arm->flag & ARM_MIRROR_EDIT) {
            flipbone = ED_armature_ebone_get_mirrored(arm->edbo, ebone);
            if (flipbone) {
              forked_iter = false; /* we extrude 2 different bones */
              if (flipbone->flag & (BONE_TIPSEL | BONE_ROOTSEL | BONE_SELECTED)) {
                /* don't want this bone to be selected... */
                flipbone->flag &= ~(BONE_TIPSEL | BONE_SELECTED | BONE_ROOTSEL);
              }
            }
            if ((flipbone == nullptr) && (forked_iter)) {
              flipbone = ebone;
            }
          }
 
          for (a = 0; a < 2; a++) {
            if (a == 1) {
              if (flipbone == nullptr) {
                break;
              }
              std::swap(flipbone, ebone);
            }
 
            totbone++;
            newbone = static_cast<EditBone *>(MEM_callocN(sizeof(EditBone), "extrudebone"));
 
            if (do_extrude == TIP_EXTRUDE) {
              copy_v3_v3(newbone->head, ebone->tail);
              copy_v3_v3(newbone->tail, newbone->head);
              newbone->parent = ebone;
 
              /* copies it, in case mirrored bone */
              newbone->flag = ebone->flag & (BONE_TIPSEL | BONE_RELATIVE_PARENTING);
 
              if (newbone->parent) {
                newbone->flag |= BONE_CONNECTED;
              }
            }
            else if (do_extrude == ROOT_EXTRUDE) {
              copy_v3_v3(newbone->head, ebone->head);
              copy_v3_v3(newbone->tail, ebone->head);
              newbone->parent = ebone->parent;
 
              newbone->flag = BONE_TIPSEL;
 
              if (newbone->parent && (ebone->flag & BONE_CONNECTED)) {
                newbone->flag |= BONE_CONNECTED;
              }
            }
 
            newbone->color = ebone->color;
 
            newbone->weight = ebone->weight;
            newbone->dist = ebone->dist;
            newbone->xwidth = ebone->xwidth;
            newbone->zwidth = ebone->zwidth;
            newbone->rad_head = ebone->rad_tail; /* don't copy entire bone. */
            newbone->rad_tail = ebone->rad_tail;
            newbone->segments = 1;
            newbone->layer = ebone->layer;
 
            /* Bendy-Bone parameters */
            newbone->roll1 = ebone->roll1;
            newbone->roll2 = ebone->roll2;
            newbone->curve_in_x = ebone->curve_in_x;
            newbone->curve_in_z = ebone->curve_in_z;
            newbone->curve_out_x = ebone->curve_out_x;
            newbone->curve_out_z = ebone->curve_out_z;
            newbone->ease1 = ebone->ease1;
            newbone->ease2 = ebone->ease2;
 
            copy_v3_v3(newbone->scale_in, ebone->scale_in);
            copy_v3_v3(newbone->scale_out, ebone->scale_out);
 
            STRNCPY(newbone->name, ebone->name);
 
            if (flipbone && forked_iter) { /* only set if mirror edit */
              if (strlen(newbone->name) < (MAXBONENAME - 2)) {
                BLI_strncat(newbone->name, (a == 0) ? "_L" : "_R", sizeof(newbone->name));
              }
            }
            ED_armature_ebone_unique_name(arm->edbo, newbone->name, nullptr);
 
            /* Copy bone collection membership. */
            BLI_duplicatelist(&newbone->bone_collections, &ebone->bone_collections);
 
            /* Add the new bone to the list */
            BLI_addtail(arm->edbo, newbone);
            if (!first) {
              first = newbone;
            }
 
            /* restore ebone if we were flipping */
            if (a == 1 && flipbone) {
              std::swap(flipbone, ebone);
            }
          }
        }
 
        /* Deselect the old bone */
        ebone->flag &= ~(BONE_TIPSEL | BONE_SELECTED | BONE_ROOTSEL);
      }
    }
    /* if only one bone, make this one active */
    if (totbone == 1 && first) {
      arm->act_edbone = first;
    }
    else {
      arm->act_edbone = newbone;
    }
 
    if (totbone == 0) {
      continue;
    }
 
    changed_multi = true;
 
    /* Transform the endpoints */
    ED_armature_edit_sync_selection(arm->edbo);
 
    WM_event_add_notifier(C, NC_OBJECT | ND_BONE_SELECT, ob);
    DEG_id_tag_update(&ob->id, ID_RECALC_SELECT);
  }
 
  if (!changed_multi) {
    return OPERATOR_CANCELLED;
  }
 
  ED_outliner_select_sync_from_edit_bone_tag(C);
 
  return OPERATOR_FINISHED;
}
 
void ARMATURE_OT_extrude(wmOperatorType *ot)
{
  /* identifiers */
  ot->name = "Extrude";
  ot->idname = "ARMATURE_OT_extrude";
  ot->description = "Create new bones from the selected joints";
 
  /* api callbacks */
  ot->exec = armature_extrude_exec;
  ot->poll = ED_operator_editarmature;
 
  /* flags */
  ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
 
  /* props */
  RNA_def_boolean(ot->srna, "forked", false, "Forked", "");
}
 
/* ********************** Bone Add *************************************/
 
/* Op makes a new bone and returns it with its tip selected. */
 
static int armature_bone_primitive_add_exec(bContext *C, wmOperator *op)
{
  RegionView3D *rv3d = CTX_wm_region_view3d(C);
  Object *obedit = CTX_data_edit_object(C);
  EditBone *bone;
  float obmat[3][3], curs[3], viewmat[3][3], totmat[3][3], imat[3][3];
  char name[MAXBONENAME];
 
  RNA_string_get(op->ptr, "name", name);
 
  copy_v3_v3(curs, CTX_data_scene(C)->cursor.location);
 
  /* Get inverse point for head and orientation for tail */
  invert_m4_m4(obedit->runtime->world_to_object.ptr(), obedit->object_to_world().ptr());
  mul_m4_v3(obedit->world_to_object().ptr(), curs);
 
  if (rv3d && (U.flag & USER_ADD_VIEWALIGNED)) {
    copy_m3_m4(obmat, rv3d->viewmat);
  }
  else {
    unit_m3(obmat);
  }
 
  copy_m3_m4(viewmat, obedit->object_to_world().ptr());
  mul_m3_m3m3(totmat, obmat, viewmat);
  invert_m3_m3(imat, totmat);
 
  ED_armature_edit_deselect_all(obedit);
 
  /* Create a bone. */
  bone = ED_armature_ebone_add(static_cast<bArmature *>(obedit->data), name);
  ANIM_armature_bonecoll_assign_active(static_cast<bArmature *>(obedit->data), bone);
 
  bArmature *arm = static_cast<bArmature *>(obedit->data);
  if (!ANIM_bonecoll_is_visible_editbone(arm, bone)) {
    const BoneCollectionReference *bcoll_ref = static_cast<const BoneCollectionReference *>(
        bone->bone_collections.first);
    BLI_assert_msg(bcoll_ref,
                   "Bone that is not visible due to its bone collections MUST be assigned to at "
                   "least one of them.");
    WM_reportf(RPT_WARNING, "Bone was added to a hidden collection '%s'", bcoll_ref->bcoll->name);
  }
 
  copy_v3_v3(bone->head, curs);
 
  if (rv3d && (U.flag & USER_ADD_VIEWALIGNED)) {
    add_v3_v3v3(bone->tail, bone->head, imat[1]); /* bone with unit length 1 */
  }
  else {
    add_v3_v3v3(bone->tail, bone->head, imat[2]); /* bone with unit length 1, pointing up Z */
  }
 
  /* NOTE: notifier might evolve. */
  WM_event_add_notifier(C, NC_OBJECT | ND_BONE_SELECT, obedit);
  DEG_id_tag_update(&obedit->id, ID_RECALC_SELECT);
  ED_outliner_select_sync_from_edit_bone_tag(C);
 
  return OPERATOR_FINISHED;
}
 
void ARMATURE_OT_bone_primitive_add(wmOperatorType *ot)
{
  /* identifiers */
  ot->name = "Add Bone";
  ot->idname = "ARMATURE_OT_bone_primitive_add";
  ot->description = "Add a new bone located at the 3D cursor";
 
  /* api callbacks */
  ot->exec = armature_bone_primitive_add_exec;
  ot->poll = ED_operator_editarmature;
 
  /* flags */
  ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
 
  RNA_def_string(ot->srna, "name", nullptr, MAXBONENAME, "Name", "Name of the newly created bone");
}
 
/* ********************** Subdivide *******************************/
 
/* Subdivide Operators:
 * This group of operators all use the same 'exec' callback, but they are called
 * through several different operators - a combined menu (which just calls the exec in the
 * appropriate ways), and two separate ones.
 */
 
static int armature_subdivide_exec(bContext *C, wmOperator *op)
{
  Object *obedit = CTX_data_edit_object(C);
  EditBone *newbone;
  int cuts, i;
 
  /* there may not be a number_cuts property defined (for 'simple' subdivide) */
  cuts = RNA_int_get(op->ptr, "number_cuts");
 
  /* loop over all editable bones */
  CTX_DATA_BEGIN_WITH_ID (C, EditBone *, ebone, selected_editable_bones, bArmature *, arm) {
    /* Keep track of the last bone in the editbone list. The newly created ones
     * will be appended after this one. */
    EditBone *last_bone_before_cutting = static_cast<EditBone *>(arm->edbo->last);
    BLI_assert_msg(last_bone_before_cutting,
                   "If there is no bone before subdividing, which bone is being subdivided here?");
 
    for (i = cuts + 1; i > 1; i--) {
      /* compute cut ratio first */
      float cutratio = 1.0f / float(i);
      float cutratioI = 1.0f - cutratio;
 
      float val1[3];
      float val2[3];
      float val3[3];
 
      newbone = static_cast<EditBone *>(MEM_mallocN(sizeof(EditBone), "ebone subdiv"));
      *newbone = *ebone;
      BLI_addtail(arm->edbo, newbone);
 
      /* calculate location of newbone->head */
      copy_v3_v3(val1, ebone->head);
      copy_v3_v3(val2, ebone->tail);
      copy_v3_v3(val3, newbone->head);
 
      val3[0] = val1[0] * cutratio + val2[0] * cutratioI;
      val3[1] = val1[1] * cutratio + val2[1] * cutratioI;
      val3[2] = val1[2] * cutratio + val2[2] * cutratioI;
 
      copy_v3_v3(newbone->head, val3);
      copy_v3_v3(newbone->tail, ebone->tail);
      copy_v3_v3(ebone->tail, newbone->head);
 
      newbone->rad_head = ((ebone->rad_head * cutratio) + (ebone->rad_tail * cutratioI));
      ebone->rad_tail = newbone->rad_head;
 
      newbone->flag |= BONE_CONNECTED;
      newbone->prop = nullptr;
 
      /* correct parent bones */
      LISTBASE_FOREACH (EditBone *, tbone, arm->edbo) {
        if (tbone->parent == ebone) {
          tbone->parent = newbone;
        }
      }
      newbone->parent = ebone;
 
      /* Copy bone collection membership. */
      BLI_duplicatelist(&newbone->bone_collections, &ebone->bone_collections);
    }
 
    /* Ensure the bones are uniquely named, in the right order to ensure "Bone" is subdivided into
     * "Bone", "Bone.001", "Bone.002", etc. This has to be in the opposite order as the cuts in the
     * code above.
     *
     * The code above cuts into fractions (for cuts=3 it cuts into 1/4, then 1/3, then 1/2), which
     * means that it MUST be run in that order. Since the loop below also must run in the order it
     * is now in, and that's the opposite order of the loop above, they cannot be combined.
     *
     * If the code above were refactored, it could just calculate the final bone length and create
     * (N-1) bones of that length, which can then be done in any order. Then the code below can be
     * integrated into the code above.
     */
    ListBase new_bones;
    new_bones.first = last_bone_before_cutting->next;
    new_bones.last = static_cast<EditBone *>(arm->edbo->last);
    LISTBASE_FOREACH_BACKWARD (EditBone *, newbone, &new_bones) {
      ED_armature_ebone_unique_name(arm->edbo, newbone->name, newbone);
    }
  }
  CTX_DATA_END;
 
  /* NOTE: notifier might evolve. */
  WM_event_add_notifier(C, NC_OBJECT | ND_BONE_SELECT, obedit);
  DEG_id_tag_update(&obedit->id, ID_RECALC_SELECT);
  ED_outliner_select_sync_from_edit_bone_tag(C);
 
  return OPERATOR_FINISHED;
}
 
void ARMATURE_OT_subdivide(wmOperatorType *ot)
{
  PropertyRNA *prop;
 
  /* identifiers */
  ot->name = "Subdivide";
  ot->idname = "ARMATURE_OT_subdivide";
  ot->description = "Break selected bones into chains of smaller bones";
 
  /* api callbacks */
  ot->exec = armature_subdivide_exec;
  ot->poll = ED_operator_editarmature;
 
  /* flags */
  ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
 
  /* Properties */
  prop = RNA_def_int(ot->srna, "number_cuts", 1, 1, 1000, "Number of Cuts", "", 1, 10);
  /* Avoid re-using last var because it can cause
   * _very_ high poly meshes and annoy users (or worse crash) */
  RNA_def_property_flag(prop, PROP_SKIP_SAVE);
}