dupli_parent_finder.cc

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/* SPDX-FileCopyrightText: 2020 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */
 
#include "dupli_parent_finder.hh"
 
#include "BLI_assert.h"
 
#include "DNA_object_types.h"
 
namespace blender::io {
 
void DupliParentFinder::insert(const DupliObject *dupli_ob)
{
  dupli_set_.add(dupli_ob->ob);
 
  PersistentID dupli_pid(dupli_ob);
  pid_to_dupli_.add(dupli_pid, dupli_ob);
  instancer_pid_to_duplis_.lookup_or_add(dupli_pid.instancer_pid(), {}).add(dupli_ob);
}
 
bool DupliParentFinder::is_duplicated(const Object *object) const
{
  return dupli_set_.contains(object);
}
 
const DupliObject *DupliParentFinder::find_suitable_export_parent(
    const DupliObject *dupli_ob) const
{
  if (dupli_ob->ob->parent != nullptr) {
    const DupliObject *parent = find_duplicated_parent(dupli_ob);
    if (parent != nullptr) {
      return parent;
    }
  }
 
  return find_instancer(dupli_ob);
}
 
const DupliObject *DupliParentFinder::find_duplicated_parent(const DupliObject *dupli_ob) const
{
  const PersistentID dupli_pid(dupli_ob);
  PersistentID parent_pid = dupli_pid.instancer_pid();
 
  const Object *parent_ob = dupli_ob->ob->parent;
  BLI_assert(parent_ob != nullptr);
 
  const blender::Set<const DupliObject *> *found = instancer_pid_to_duplis_.lookup_ptr(parent_pid);
  if (!found) {
    /* Unexpected, as there should be at least one entry here, for the dupli_ob itself. */
    return nullptr;
  }
 
  for (const DupliObject *potential_parent_dupli : *found) {
    if (potential_parent_dupli->ob != parent_ob) {
      continue;
    }
 
    PersistentID potential_parent_pid(potential_parent_dupli);
    if (potential_parent_pid.is_from_same_instancer_as(dupli_pid)) {
      return potential_parent_dupli;
    }
  }
  return nullptr;
}
 
const DupliObject *DupliParentFinder::find_instancer(const DupliObject *dupli_ob) const
{
  PersistentID dupli_pid(dupli_ob);
  PersistentID parent_pid = dupli_pid.instancer_pid();
 
  const DupliObject *const *found = pid_to_dupli_.lookup_ptr(parent_pid);
  if (!found) {
    return nullptr;
  }
 
  const DupliObject *instancer_dupli = *found;
  return instancer_dupli;
}
 
}  // namespace blender::io