/*
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
 * All rights reserved.
 */

/** \file
 * \ingroup bke
 *
 * Contains management of ID's and libraries
 * allocate and free of all library data
 */

#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <stdlib.h>
#include <stddef.h>
#include <assert.h>

#include "CLG_log.h"

#include "MEM_guardedalloc.h"

/* all types are needed here, in order to do memory operations */
#include "DNA_anim_types.h"
#include "DNA_armature_types.h"
#include "DNA_brush_types.h"
#include "DNA_cachefile_types.h"
#include "DNA_camera_types.h"
#include "DNA_collection_types.h"
#include "DNA_gpencil_types.h"
#include "DNA_ipo_types.h"
#include "DNA_key_types.h"
#include "DNA_light_types.h"
#include "DNA_lattice_types.h"
#include "DNA_linestyle_types.h"
#include "DNA_material_types.h"
#include "DNA_mesh_types.h"
#include "DNA_meta_types.h"
#include "DNA_modifier_types.h"
#include "DNA_movieclip_types.h"
#include "DNA_mask_types.h"
#include "DNA_node_types.h"
#include "DNA_object_types.h"
#include "DNA_lightprobe_types.h"
#include "DNA_rigidbody_types.h"
#include "DNA_scene_types.h"
#include "DNA_screen_types.h"
#include "DNA_speaker_types.h"
#include "DNA_sound_types.h"
#include "DNA_text_types.h"
#include "DNA_vfont_types.h"
#include "DNA_windowmanager_types.h"
#include "DNA_world_types.h"
#include "DNA_workspace_types.h"

#include "BLI_blenlib.h"
#include "BLI_utildefines.h"
#include "BLI_ghash.h"
#include "BLI_linklist.h"
#include "BLI_memarena.h"
#include "BLI_string_utils.h"

#include "BLT_translation.h"

#include "BKE_action.h"
#include "BKE_animsys.h"
#include "BKE_armature.h"
#include "BKE_bpath.h"
#include "BKE_brush.h"
#include "BKE_camera.h"
#include "BKE_cachefile.h"
#include "BKE_collection.h"
#include "BKE_context.h"
#include "BKE_curve.h"
#include "BKE_font.h"
#include "BKE_global.h"
#include "BKE_gpencil.h"
#include "BKE_idcode.h"
#include "BKE_idprop.h"
#include "BKE_image.h"
#include "BKE_key.h"
#include "BKE_light.h"
#include "BKE_lattice.h"
#include "BKE_library.h"
#include "BKE_library_query.h"
#include "BKE_library_remap.h"
#include "BKE_linestyle.h"
#include "BKE_mesh.h"
#include "BKE_mesh_runtime.h"
#include "BKE_material.h"
#include "BKE_main.h"
#include "BKE_mball.h"
#include "BKE_mask.h"
#include "BKE_movieclip.h"
#include "BKE_node.h"
#include "BKE_object.h"
#include "BKE_paint.h"
#include "BKE_particle.h"
#include "BKE_packedFile.h"
#include "BKE_lightprobe.h"
#include "BKE_rigidbody.h"
#include "BKE_sound.h"
#include "BKE_speaker.h"
#include "BKE_scene.h"
#include "BKE_text.h"
#include "BKE_texture.h"
#include "BKE_world.h"

#include "DEG_depsgraph.h"

#include "RNA_access.h"

#include "IMB_imbuf.h"
#include "IMB_imbuf_types.h"

#include "atomic_ops.h"

//#define DEBUG_TIME

#ifdef DEBUG_TIME
#  include "PIL_time_utildefines.h"
#endif

static CLG_LogRef LOG = {"bke.library"};

/* GS reads the memory pointed at in a specific ordering.
 * only use this definition, makes little and big endian systems
 * work fine, in conjunction with MAKE_ID */

/* ************* general ************************ */

/* this has to be called from each make_local_* func, we could call
 * from id_make_local() but then the make local functions would not be self
 * contained.
 * also note that the id _must_ have a library - campbell */
void BKE_id_lib_local_paths(Main *bmain, Library *lib, ID *id)
{
  const char *bpath_user_data[2] = {BKE_main_blendfile_path(bmain), lib->filepath};

  BKE_bpath_traverse_id(bmain,
                        id,
                        BKE_bpath_relocate_visitor,
                        BKE_BPATH_TRAVERSE_SKIP_MULTIFILE,
                        (void *)bpath_user_data);
}

void id_lib_extern(ID *id)
{
  if (id && ID_IS_LINKED(id)) {
    BLI_assert(BKE_idcode_is_linkable(GS(id->name)));
    if (id->tag & LIB_TAG_INDIRECT) {
      id->tag &= ~LIB_TAG_INDIRECT;
      id->flag &= ~LIB_INDIRECT_WEAK_LINK;
      id->tag |= LIB_TAG_EXTERN;
      id->lib->parent = NULL;
    }
  }
}

void id_lib_indirect_weak_link(ID *id)
{
  if (id && ID_IS_LINKED(id)) {
    BLI_assert(BKE_idcode_is_linkable(GS(id->name)));
    if (id->tag & LIB_TAG_INDIRECT) {
      id->flag |= LIB_INDIRECT_WEAK_LINK;
    }
  }
}

/**
 * Ensure we have a real user
 *
 * \note Now that we have flags, we could get rid of the 'fake_user' special case,
 * flags are enough to ensure we always have a real user.
 * However, #ID_REAL_USERS is used in several places outside of core library.c,
 * so think we can wait later to make this change.
 */
void id_us_ensure_real(ID *id)
{
  if (id) {
    const int limit = ID_FAKE_USERS(id);
    id->tag |= LIB_TAG_EXTRAUSER;
    if (id->us <= limit) {
      if (id->us < limit || ((id->us == limit) && (id->tag & LIB_TAG_EXTRAUSER_SET))) {
        CLOG_ERROR(&LOG,
                   "ID user count error: %s (from '%s')",
                   id->name,
                   id->lib ? id->lib->filepath : "[Main]");
        BLI_assert(0);
      }
      id->us = limit + 1;
      id->tag |= LIB_TAG_EXTRAUSER_SET;
    }
  }
}

void id_us_clear_real(ID *id)
{
  if (id && (id->tag & LIB_TAG_EXTRAUSER)) {
    if (id->tag & LIB_TAG_EXTRAUSER_SET) {
      id->us--;
      BLI_assert(id->us >= ID_FAKE_USERS(id));
    }
    id->tag &= ~(LIB_TAG_EXTRAUSER | LIB_TAG_EXTRAUSER_SET);
  }
}

/**
 * Same as \a id_us_plus, but does not handle lib indirect -> extern.
 * Only used by readfile.c so far, but simpler/safer to keep it here nonetheless.
 */
void id_us_plus_no_lib(ID *id)
{
  if (id) {
    if ((id->tag & LIB_TAG_EXTRAUSER) && (id->tag & LIB_TAG_EXTRAUSER_SET)) {
      BLI_assert(id->us >= 1);
      /* No need to increase count, just tag extra user as no more set.
       * Avoids annoying & inconsistent +1 in user count. */
      id->tag &= ~LIB_TAG_EXTRAUSER_SET;
    }
    else {
      BLI_assert(id->us >= 0);
      id->us++;
    }
  }
}

void id_us_plus(ID *id)
{
  if (id) {
    id_us_plus_no_lib(id);
    id_lib_extern(id);
  }
}

/* decrements the user count for *id. */
void id_us_min(ID *id)
{
  if (id) {
    const int limit = ID_FAKE_USERS(id);

    if (id->us <= limit) {
      CLOG_ERROR(&LOG,
                 "ID user decrement error: %s (from '%s'): %d <= %d",
                 id->name,
                 id->lib ? id->lib->filepath : "[Main]",
                 id->us,
                 limit);
      BLI_assert(0);
      id->us = limit;
    }
    else {
      id->us--;
    }

    if ((id->us == limit) && (id->tag & LIB_TAG_EXTRAUSER)) {
      /* We need an extra user here, but never actually incremented user count for it so far,
       * do it now. */
      id_us_ensure_real(id);
    }
  }
}

void id_fake_user_set(ID *id)
{
  if (id && !(id->flag & LIB_FAKEUSER)) {
    id->flag |= LIB_FAKEUSER;
    id_us_plus(id);
  }
}

void id_fake_user_clear(ID *id)
{
  if (id && (id->flag & LIB_FAKEUSER)) {
    id->flag &= ~LIB_FAKEUSER;
    id_us_min(id);
  }
}

void BKE_id_clear_newpoin(ID *id)
{
  if (id->newid) {
    id->newid->tag &= ~LIB_TAG_NEW;
  }
  id->newid = NULL;
}

static int id_expand_local_callback(void *UNUSED(user_data),
                                    struct ID *id_self,
                                    struct ID **id_pointer,
                                    int cb_flag)
{
  if (cb_flag & IDWALK_CB_PRIVATE) {
    return IDWALK_RET_NOP;
  }

  /* Can happen that we get un-linkable ID here, e.g. with shape-key referring to itself
   * (through drivers)...
   * Just skip it, shape key can only be either indirectly linked, or fully local, period.
   * And let's curse one more time that stupid useless shapekey ID type! */
  if (*id_pointer && *id_pointer != id_self && BKE_idcode_is_linkable(GS((*id_pointer)->name))) {
    id_lib_extern(*id_pointer);
  }

  return IDWALK_RET_NOP;
}

/**
 * Expand ID usages of given id as 'extern' (and no more indirect) linked data.
 * Used by ID copy/make_local functions.
 */
void BKE_id_expand_local(Main *bmain, ID *id)
{
  BKE_library_foreach_ID_link(bmain, id, id_expand_local_callback, NULL, IDWALK_READONLY);
}

/**
 * Ensure new (copied) ID is fully made local.
 */
void BKE_id_copy_ensure_local(Main *bmain, const ID *old_id, ID *new_id)
{
  if (ID_IS_LINKED(old_id)) {
    BKE_id_expand_local(bmain, new_id);
    BKE_id_lib_local_paths(bmain, old_id->lib, new_id);
  }
}

/**
 * Generic 'make local' function, works for most of data-block types...
 */
void BKE_id_make_local_generic(Main *bmain,
                               ID *id,
                               const bool id_in_mainlist,
                               const bool lib_local)
{
  bool is_local = false, is_lib = false;

  /* - only lib users: do nothing (unless force_local is set)
   * - only local users: set flag
   * - mixed: make copy
   * In case we make a whole lib's content local,
   * we always want to localize, and we skip remapping (done later).
   */

  if (!ID_IS_LINKED(id)) {
    return;
  }

  BKE_library_ID_test_usages(bmain, id, &is_local, &is_lib);

  if (lib_local || is_local) {
    if (!is_lib) {
      id_clear_lib_data_ex(bmain, id, id_in_mainlist);
      BKE_id_expand_local(bmain, id);
    }
    else {
      ID *id_new;

      /* Should not fail in expected use cases,
       * but a few ID types cannot be copied (LIB, WM, SCR...). */
      if (BKE_id_copy(bmain, id, &id_new)) {
        id_new->us = 0;

        /* setting newid is mandatory for complex make_lib_local logic... */
        ID_NEW_SET(id, id_new);
        Key *key = BKE_key_from_id(id), *key_new = BKE_key_from_id(id);
        if (key && key_new) {
          ID_NEW_SET(key, key_new);
        }
        bNodeTree *ntree = ntreeFromID(id), *ntree_new = ntreeFromID(id_new);
        if (ntree && ntree_new) {
          ID_NEW_SET(ntree, ntree_new);
        }

        if (!lib_local) {
          BKE_libblock_remap(bmain, id, id_new, ID_REMAP_SKIP_INDIRECT_USAGE);
        }
      }
    }
  }
}

/**
 * Calls the appropriate make_local method for the block, unless test is set.
 *
 * \note Always set ID->newid pointer in case it gets duplicated...
 *
 * \param lib_local: Special flag used when making a whole library's content local,
 * it needs specific handling.
 *
 * \return true if the block can be made local.
 */
bool id_make_local(Main *bmain, ID *id, const bool test, const bool lib_local)
{
  /* We don't care whether ID is directly or indirectly linked
   * in case we are making a whole lib local... */
  if (!lib_local && (id->tag & LIB_TAG_INDIRECT)) {
    return false;
  }

  switch ((ID_Type)GS(id->name)) {
    case ID_SCE:
      if (!test) {
        BKE_scene_make_local(bmain, (Scene *)id, lib_local);
      }
      return true;
    case ID_OB:
      if (!test) {
        BKE_object_make_local(bmain, (Object *)id, lib_local);
      }
      return true;
    case ID_ME:
      if (!test) {
        BKE_mesh_make_local(bmain, (Mesh *)id, lib_local);
      }
      return true;
    case ID_CU:
      if (!test) {
        BKE_curve_make_local(bmain, (Curve *)id, lib_local);
      }
      return true;
    case ID_MB:
      if (!test) {
        BKE_mball_make_local(bmain, (MetaBall *)id, lib_local);
      }
      return true;
    case ID_MA:
      if (!test) {
        BKE_material_make_local(bmain, (Material *)id, lib_local);
      }
      return true;
    case ID_TE:
      if (!test) {
        BKE_texture_make_local(bmain, (Tex *)id, lib_local);
      }
      return true;
    case ID_IM:
      if (!test) {
        BKE_image_make_local(bmain, (Image *)id, lib_local);
      }
      return true;
    case ID_LT:
      if (!test) {
        BKE_lattice_make_local(bmain, (Lattice *)id, lib_local);
      }
      return true;
    case ID_LA:
      if (!test) {
        BKE_light_make_local(bmain, (Light *)id, lib_local);
      }
      return true;
    case ID_CA:
      if (!test) {
        BKE_camera_make_local(bmain, (Camera *)id, lib_local);
      }
      return true;
    case ID_SPK:
      if (!test) {
        BKE_speaker_make_local(bmain, (Speaker *)id, lib_local);
      }
      return true;
    case ID_LP:
      if (!test) {
        BKE_lightprobe_make_local(bmain, (LightProbe *)id, lib_local);
      }
      return true;
    case ID_WO:
      if (!test) {
        BKE_world_make_local(bmain, (World *)id, lib_local);
      }
      return true;
    case ID_VF:
      if (!test) {
        BKE_vfont_make_local(bmain, (VFont *)id, lib_local);
      }
      return true;
    case ID_TXT:
      if (!test) {
        BKE_text_make_local(bmain, (Text *)id, lib_local);
      }
      return true;
    case ID_SO:
      if (!test) {
        BKE_sound_make_local(bmain, (bSound *)id, lib_local);
      }
      return true;
    case ID_GR:
      if (!test) {
        BKE_collection_make_local(bmain, (Collection *)id, lib_local);
      }
      return true;
    case ID_AR:
      if (!test) {
        BKE_armature_make_local(bmain, (bArmature *)id, lib_local);
      }
      return true;
    case ID_AC:
      if (!test) {
        BKE_action_make_local(bmain, (bAction *)id, lib_local);
      }
      return true;
    case ID_NT:
      if (!test) {
        ntreeMakeLocal(bmain, (bNodeTree *)id, true, lib_local);
      }
      return true;
    case ID_BR:
      if (!test) {
        BKE_brush_make_local(bmain, (Brush *)id, lib_local);
      }
      return true;
    case ID_PA:
      if (!test) {
        BKE_particlesettings_make_local(bmain, (ParticleSettings *)id, lib_local);
      }
      return true;
    case ID_GD:
      if (!test) {
        BKE_gpencil_make_local(bmain, (bGPdata *)id, lib_local);
      }
      return true;
    case ID_MC:
      if (!test) {
        BKE_movieclip_make_local(bmain, (MovieClip *)id, lib_local);
      }
      return true;
    case ID_MSK:
      if (!test) {
        BKE_mask_make_local(bmain, (Mask *)id, lib_local);
      }
      return true;
    case ID_LS:
      if (!test) {
        BKE_linestyle_make_local(bmain, (FreestyleLineStyle *)id, lib_local);
      }
      return true;
    case ID_PAL:
      if (!test) {
        BKE_palette_make_local(bmain, (Palette *)id, lib_local);
      }
      return true;
    case ID_PC:
      if (!test) {
        BKE_paint_curve_make_local(bmain, (PaintCurve *)id, lib_local);
      }
      return true;
    case ID_CF:
      if (!test) {
        BKE_cachefile_make_local(bmain, (CacheFile *)id, lib_local);
      }
      return true;
    case ID_WS:
    case ID_SCR:
      /* A bit special: can be appended but not linked. Return false
       * since supporting make-local doesn't make much sense. */
      return false;
    case ID_LI:
    case ID_KE:
    case ID_WM:
      return false; /* can't be linked */
    case ID_IP:
      return false; /* deprecated */
  }

  return false;
}

struct IDCopyLibManagementData {
  const ID *id_src;
  ID *id_dst;
  int flag;
};

/* Increases usercount as required, and remap self ID pointers. */
static int id_copy_libmanagement_cb(void *user_data,
                                    ID *UNUSED(id_self),
                                    ID **id_pointer,
                                    int cb_flag)
{
  struct IDCopyLibManagementData *data = user_data;
  ID *id = *id_pointer;

  /* Remap self-references to new copied ID. */
  if (id == data->id_src) {
    /* We cannot use id_self here, it is not *always* id_dst (thanks to $£!+@#&/? nodetrees). */
    id = *id_pointer = data->id_dst;
  }

  /* Increase used IDs refcount if needed and required. */
  if ((data->flag & LIB_ID_CREATE_NO_USER_REFCOUNT) == 0 && (cb_flag & IDWALK_CB_USER)) {
    id_us_plus(id);
  }

  return IDWALK_RET_NOP;
}

bool BKE_id_copy_is_allowed(const ID *id)
{
#define LIB_ID_TYPES_NOCOPY \
  ID_LI, ID_SCR, ID_WM, ID_WS, /* Not supported */ \
      ID_IP                    /* Deprecated */

  return !ELEM(GS(id->name), LIB_ID_TYPES_NOCOPY);

#undef LIB_ID_TYPES_NOCOPY
}

/**
 * Generic entry point for copying a data-block (new API).
 *
 * \note Copy is only affecting given data-block
 * (no ID used by copied one will be affected, besides usercount).
 * There is only one exception, if #LIB_ID_COPY_ACTIONS is defined,
 * actions used by animdata will be duplicated.
 *
 * \note Usercount of new copy is always set to 1.
 *
 * \param bmain: Main database, may be NULL only if LIB_ID_CREATE_NO_MAIN is specified.
 * \param id: Source data-block.
 * \param r_newid: Pointer to new (copied) ID pointer.
 * \param flag: Set of copy options, see DNA_ID.h enum for details
 * (leave to zero for default, full copy).
 * \return False when copying that ID type is not supported, true otherwise.
 */
bool BKE_id_copy_ex(Main *bmain, const ID *id, ID **r_newid, const int flag)
{
  BLI_assert(r_newid != NULL);
  /* Make sure destination pointer is all good. */
  if ((flag & LIB_ID_CREATE_NO_ALLOCATE) == 0) {
    *r_newid = NULL;
  }
  else {
    if (*r_newid != NULL) {
      /* Allow some garbage non-initialized memory to go in, and clean it up here. */
      const size_t size = BKE_libblock_get_alloc_info(GS(id->name), NULL);
      memset(*r_newid, 0, size);
    }
  }

  /* Early output is source is NULL. */
  if (id == NULL) {
    return false;
  }
  if (!BKE_id_copy_is_allowed(id)) {
    return false;
  }

  BKE_libblock_copy_ex(bmain, id, r_newid, flag);

  switch ((ID_Type)GS(id->name)) {
    case ID_SCE:
      BKE_scene_copy_data(bmain, (Scene *)*r_newid, (Scene *)id, flag);
      break;
    case ID_OB:
      BKE_object_copy_data(bmain, (Object *)*r_newid, (Object *)id, flag);
      break;
    case ID_ME:
      BKE_mesh_copy_data(bmain, (Mesh *)*r_newid, (Mesh *)id, flag);
      break;
    case ID_CU:
      BKE_curve_copy_data(bmain, (Curve *)*r_newid, (Curve *)id, flag);
      break;
    case ID_MB:
      BKE_mball_copy_data(bmain, (MetaBall *)*r_newid, (MetaBall *)id, flag);
      break;
    case ID_MA:
      BKE_material_copy_data(bmain, (Material *)*r_newid, (Material *)id, flag);
      break;
    case ID_TE:
      BKE_texture_copy_data(bmain, (Tex *)*r_newid, (Tex *)id, flag);
      break;
    case ID_IM:
      BKE_image_copy_data(bmain, (Image *)*r_newid, (Image *)id, flag);
      break;
    case ID_LT:
      BKE_lattice_copy_data(bmain, (Lattice *)*r_newid, (Lattice *)id, flag);
      break;
    case ID_LA:
      BKE_light_copy_data(bmain, (Light *)*r_newid, (Light *)id, flag);
      break;
    case ID_SPK:
      BKE_speaker_copy_data(bmain, (Speaker *)*r_newid, (Speaker *)id, flag);
      break;
    case ID_LP:
      BKE_lightprobe_copy_data(bmain, (LightProbe *)*r_newid, (LightProbe *)id, flag);
      break;
    case ID_CA:
      BKE_camera_copy_data(bmain, (Camera *)*r_newid, (Camera *)id, flag);
      break;
    case ID_KE:
      BKE_key_copy_data(bmain, (Key *)*r_newid, (Key *)id, flag);
      break;
    case ID_WO:
      BKE_world_copy_data(bmain, (World *)*r_newid, (World *)id, flag);
      break;
    case ID_TXT:
      BKE_text_copy_data(bmain, (Text *)*r_newid, (Text *)id, flag);
      break;
    case ID_GR:
      BKE_collection_copy_data(bmain, (Collection *)*r_newid, (Collection *)id, flag);
      break;
    case ID_AR:
      BKE_armature_copy_data(bmain, (bArmature *)*r_newid, (bArmature *)id, flag);
      break;
    case ID_AC:
      BKE_action_copy_data(bmain, (bAction *)*r_newid, (bAction *)id, flag);
      break;
    case ID_NT:
      BKE_node_tree_copy_data(bmain, (bNodeTree *)*r_newid, (bNodeTree *)id, flag);
      break;
    case ID_BR:
      BKE_brush_copy_data(bmain, (Brush *)*r_newid, (Brush *)id, flag);
      break;
    case ID_PA:
      BKE_particlesettings_copy_data(
          bmain, (ParticleSettings *)*r_newid, (ParticleSettings *)id, flag);
      break;
    case ID_GD:
      BKE_gpencil_copy_data((bGPdata *)*r_newid, (bGPdata *)id, flag);
      break;
    case ID_MC:
      BKE_movieclip_copy_data(bmain, (MovieClip *)*r_newid, (MovieClip *)id, flag);
      break;
    case ID_MSK:
      BKE_mask_copy_data(bmain, (Mask *)*r_newid, (Mask *)id, flag);
      break;
    case ID_LS:
      BKE_linestyle_copy_data(
          bmain, (FreestyleLineStyle *)*r_newid, (FreestyleLineStyle *)id, flag);
      break;
    case ID_PAL:
      BKE_palette_copy_data(bmain, (Palette *)*r_newid, (Palette *)id, flag);
      break;
    case ID_PC:
      BKE_paint_curve_copy_data(bmain, (PaintCurve *)*r_newid, (PaintCurve *)id, flag);
      break;
    case ID_CF:
      BKE_cachefile_copy_data(bmain, (CacheFile *)*r_newid, (CacheFile *)id, flag);
      break;
    case ID_SO:
      BKE_sound_copy_data(bmain, (bSound *)*r_newid, (bSound *)id, flag);
      break;
    case ID_VF:
      BKE_vfont_copy_data(bmain, (VFont *)*r_newid, (VFont *)id, flag);
      break;
    case ID_LI:
    case ID_SCR:
    case ID_WM:
    case ID_WS:
    case ID_IP:
      BLI_assert(0); /* Should have been rejected at start of function! */
      break;
  }

  /* Update ID refcount, remap pointers to self in new ID. */
  struct IDCopyLibManagementData data = {
      .id_src = id,
      .id_dst = *r_newid,
      .flag = flag,
  };
  BKE_library_foreach_ID_link(bmain, *r_newid, id_copy_libmanagement_cb, &data, IDWALK_NOP);

  /* Do not make new copy local in case we are copying outside of main...
   * XXX TODO: is this behavior OK, or should we need own flag to control that? */
  if ((flag & LIB_ID_CREATE_NO_MAIN) == 0) {
    BLI_assert((flag & LIB_ID_COPY_KEEP_LIB) == 0);
    BKE_id_copy_ensure_local(bmain, id, *r_newid);
  }
  else {
    (*r_newid)->lib = id->lib;
  }

  return true;
}

/**
 * Invokes the appropriate copy method for the block and returns the result in
 * newid, unless test. Returns true if the block can be copied.
 */
bool BKE_id_copy(Main *bmain, const ID *id, ID **newid)
{
  return BKE_id_copy_ex(bmain, id, newid, LIB_ID_COPY_DEFAULT);
}

/** Does a mere memory swap over the whole IDs data (including type-specific memory).
 * \note Most internal ID data itself is not swapped (only IDProperties are). */
void BKE_id_swap(Main *bmain, ID *id_a, ID *id_b)
{
  BLI_assert(GS(id_a->name) == GS(id_b->name));

  const ID id_a_back = *id_a;
  const ID id_b_back = *id_b;

#define CASE_SWAP(_gs, _type) \
  case _gs: \
    SWAP(_type, *(_type *)id_a, *(_type *)id_b); \
    break

  switch ((ID_Type)GS(id_a->name)) {
    CASE_SWAP(ID_SCE, Scene);
    CASE_SWAP(ID_LI, Library);
    CASE_SWAP(ID_OB, Object);
    CASE_SWAP(ID_ME, Mesh);
    CASE_SWAP(ID_CU, Curve);
    CASE_SWAP(ID_MB, MetaBall);
    CASE_SWAP(ID_MA, Material);
    CASE_SWAP(ID_TE, Tex);
    CASE_SWAP(ID_IM, Image);
    CASE_SWAP(ID_LT, Lattice);
    CASE_SWAP(ID_LA, Light);
    CASE_SWAP(ID_LP, LightProbe);
    CASE_SWAP(ID_CA, Camera);
    CASE_SWAP(ID_KE, Key);
    CASE_SWAP(ID_WO, World);
    CASE_SWAP(ID_SCR, bScreen);
    CASE_SWAP(ID_VF, VFont);
    CASE_SWAP(ID_TXT, Text);
    CASE_SWAP(ID_SPK, Speaker);
    CASE_SWAP(ID_SO, bSound);
    CASE_SWAP(ID_GR, Collection);
    CASE_SWAP(ID_AR, bArmature);
    CASE_SWAP(ID_AC, bAction);
    CASE_SWAP(ID_NT, bNodeTree);
    CASE_SWAP(ID_BR, Brush);
    CASE_SWAP(ID_PA, ParticleSettings);
    CASE_SWAP(ID_WM, wmWindowManager);
    CASE_SWAP(ID_WS, WorkSpace);
    CASE_SWAP(ID_GD, bGPdata);
    CASE_SWAP(ID_MC, MovieClip);
    CASE_SWAP(ID_MSK, Mask);
    CASE_SWAP(ID_LS, FreestyleLineStyle);
    CASE_SWAP(ID_PAL, Palette);
    CASE_SWAP(ID_PC, PaintCurve);
    CASE_SWAP(ID_CF, CacheFile);
    case ID_IP:
      break; /* Deprecated. */
  }

#undef CASE_SWAP

  /* Restore original ID's internal data. */
  *id_a = id_a_back;
  *id_b = id_b_back;

  /* Exception: IDProperties. */
  id_a->properties = id_b_back.properties;
  id_b->properties = id_a_back.properties;

  /* Swap will have broken internal references to itself, restore them. */
  BKE_libblock_relink_ex(bmain, id_a, id_b, id_a, ID_REMAP_SKIP_NEVER_NULL_USAGE);
  BKE_libblock_relink_ex(bmain, id_b, id_a, id_b, ID_REMAP_SKIP_NEVER_NULL_USAGE);
}

/** Does *not* set ID->newid pointer. */
bool id_single_user(bContext *C, ID *id, PointerRNA *ptr, PropertyRNA *prop)
{
  ID *newid = NULL;
  PointerRNA idptr;

  if (id) {
    /* If property isn't editable,
     * we're going to have an extra block hanging around until we save. */
    if (RNA_property_editable(ptr, prop)) {
      Main *bmain = CTX_data_main(C);
      /* copy animation actions too */
      if (BKE_id_copy_ex(bmain, id, &newid, LIB_ID_COPY_DEFAULT | LIB_ID_COPY_ACTIONS) && newid) {
        /* us is 1 by convention with new IDs, but RNA_property_pointer_set
         * will also increment it, decrement it here. */
        id_us_min(newid);

        /* assign copy */
        RNA_id_pointer_create(newid, &idptr);
        RNA_property_pointer_set(ptr, prop, idptr, NULL);
        RNA_property_update(C, ptr, prop);

        /* tag grease pencil data-block and disable onion */
        if (GS(id->name) == ID_GD) {
          DEG_id_tag_update(id, ID_RECALC_TRANSFORM | ID_RECALC_GEOMETRY);
          DEG_id_tag_update(newid, ID_RECALC_TRANSFORM | ID_RECALC_GEOMETRY);
          bGPdata *gpd = (bGPdata *)newid;
          gpd->flag &= ~GP_DATA_SHOW_ONIONSKINS;
        }

        return true;
      }
    }
  }

  return false;
}

static int libblock_management_us_plus(void *UNUSED(user_data),
                                       ID *UNUSED(id_self),
                                       ID **id_pointer,
                                       int cb_flag)
{
  if (cb_flag & IDWALK_CB_USER) {
    id_us_plus(*id_pointer);
  }
  if (cb_flag & IDWALK_CB_USER_ONE) {
    id_us_ensure_real(*id_pointer);
  }

  return IDWALK_RET_NOP;
}

static int libblock_management_us_min(void *UNUSED(user_data),
                                      ID *UNUSED(id_self),
                                      ID **id_pointer,
                                      int cb_flag)
{
  if (cb_flag & IDWALK_CB_USER) {
    id_us_min(*id_pointer);
  }
  /* We can do nothing in IDWALK_CB_USER_ONE case! */

  return IDWALK_RET_NOP;
}

/** Add a 'NO_MAIN' data-block to given main (also sets usercounts of its IDs if needed). */
void BKE_libblock_management_main_add(Main *bmain, void *idv)
{
  ID *id = idv;

  BLI_assert(bmain != NULL);
  if ((id->tag & LIB_TAG_NO_MAIN) == 0) {
    return;
  }

  if ((id->tag & LIB_TAG_NOT_ALLOCATED) != 0) {
    /* We cannot add non-allocated ID to Main! */
    return;
  }

  /* We cannot allow non-userrefcounting IDs in Main database! */
  if ((id->tag & LIB_TAG_NO_USER_REFCOUNT) != 0) {
    BKE_library_foreach_ID_link(bmain, id, libblock_management_us_plus, NULL, IDWALK_NOP);
  }

  ListBase *lb = which_libbase(bmain, GS(id->name));
  BKE_main_lock(bmain);
  BLI_addtail(lb, id);
  BKE_id_new_name_validate(lb, id, NULL);
  /* alphabetic insertion: is in new_id */
  id->tag &= ~(LIB_TAG_NO_MAIN | LIB_TAG_NO_USER_REFCOUNT);
  bmain->is_memfile_undo_written = false;
  BKE_main_unlock(bmain);
}

/** Remove a data-block from given main (set it to 'NO_MAIN' status). */
void BKE_libblock_management_main_remove(Main *bmain, void *idv)
{
  ID *id = idv;

  BLI_assert(bmain != NULL);
  if ((id->tag & LIB_TAG_NO_MAIN) != 0) {
    return;
  }

  /* For now, allow userrefcounting IDs to get out of Main - can be handy in some cases... */

  ListBase *lb = which_libbase(bmain, GS(id->name));
  BKE_main_lock(bmain);
  BLI_remlink(lb, id);
  id->tag |= LIB_TAG_NO_MAIN;
  bmain->is_memfile_undo_written = false;
  BKE_main_unlock(bmain);
}

void BKE_libblock_management_usercounts_set(Main *bmain, void *idv)
{
  ID *id = idv;

  if ((id->tag & LIB_TAG_NO_USER_REFCOUNT) == 0) {
    return;
  }

  BKE_library_foreach_ID_link(bmain, id, libblock_management_us_plus, NULL, IDWALK_NOP);
  id->tag &= ~LIB_TAG_NO_USER_REFCOUNT;
}

void BKE_libblock_management_usercounts_clear(Main *bmain, void *idv)
{
  ID *id = idv;

  /* We do not allow IDs in Main database to not be userrefcounting. */
  if ((id->tag & LIB_TAG_NO_USER_REFCOUNT) != 0 || (id->tag & LIB_TAG_NO_MAIN) != 0) {
    return;
  }

  BKE_library_foreach_ID_link(bmain, id, libblock_management_us_min, NULL, IDWALK_NOP);
  id->tag |= LIB_TAG_NO_USER_REFCOUNT;
}

/**
 * Clear or set given tags for all ids in listbase (runtime tags).
 */
void BKE_main_id_tag_listbase(ListBase *lb, const int tag, const bool value)
{
  ID *id;
  if (value) {
    for (id = lb->first; id; id = id->next) {
      id->tag |= tag;
    }
  }
  else {
    const int ntag = ~tag;
    for (id = lb->first; id; id = id->next) {
      id->tag &= ntag;
    }
  }
}

/**
 * Clear or set given tags for all ids of given type in bmain (runtime tags).
 */
void BKE_main_id_tag_idcode(struct Main *mainvar,
                            const short type,
                            const int tag,
                            const bool value)
{
  ListBase *lb = which_libbase(mainvar, type);

  BKE_main_id_tag_listbase(lb, tag, value);
}

/**
 * Clear or set given tags for all ids in bmain (runtime tags).
 */
void BKE_main_id_tag_all(struct Main *mainvar, const int tag, const bool value)
{
  ListBase *lbarray[MAX_LIBARRAY];
  int a;

  a = set_listbasepointers(mainvar, lbarray);
  while (a--) {
    BKE_main_id_tag_listbase(lbarray[a], tag, value);
  }
}

/**
 * Clear or set given flags for all ids in listbase (persistent flags).
 */
void BKE_main_id_flag_listbase(ListBase *lb, const int flag, const bool value)
{
  ID *id;
  if (value) {
    for (id = lb->first; id; id = id->next) {
      id->tag |= flag;
    }
  }
  else {
    const int nflag = ~flag;
    for (id = lb->first; id; id = id->next) {
      id->tag &= nflag;
    }
  }
}

/**
 * Clear or set given flags for all ids in bmain (persistent flags).
 */
void BKE_main_id_flag_all(Main *bmain, const int flag, const bool value)
{
  ListBase *lbarray[MAX_LIBARRAY];
  int a;
  a = set_listbasepointers(bmain, lbarray);
  while (a--) {
    BKE_main_id_flag_listbase(lbarray[a], flag, value);
  }
}

void BKE_main_id_repair_duplicate_names_listbase(ListBase *lb)
{
  int lb_len = 0;
  for (ID *id = lb->first; id; id = id->next) {
    if (id->lib == NULL) {
      lb_len += 1;
    }
  }
  if (lb_len <= 1) {
    return;
  }

  /* Fill an array because renaming sorts. */
  ID **id_array = MEM_mallocN(sizeof(*id_array) * lb_len, __func__);
  GSet *gset = BLI_gset_str_new_ex(__func__, lb_len);
  int i = 0;
  for (ID *id = lb->first; id; id = id->next) {
    if (id->lib == NULL) {
      id_array[i] = id;
      i++;
    }
  }
  for (i = 0; i < lb_len; i++) {
    if (!BLI_gset_add(gset, id_array[i]->name + 2)) {
      BKE_id_new_name_validate(lb, id_array[i], NULL);
    }
  }
  BLI_gset_free(gset, NULL);
  MEM_freeN(id_array);
}

void BKE_main_lib_objects_recalc_all(Main *bmain)
{
  Object *ob;

  /* flag for full recalc */
  for (ob = bmain->objects.first; ob; ob = ob->id.next) {
    if (ID_IS_LINKED(ob)) {
      DEG_id_tag_update(&ob->id, ID_RECALC_TRANSFORM | ID_RECALC_GEOMETRY | ID_RECALC_ANIMATION);
    }
  }

  DEG_id_type_tag(bmain, ID_OB);
}

/* *********** ALLOC AND FREE *****************
 *
 * BKE_libblock_free(ListBase *lb, ID *id )
 * provide a list-basis and data-block, but only ID is read
 *
 * void *BKE_libblock_alloc(ListBase *lb, type, name)
 * inserts in list and returns a new ID
 *
 * **************************** */

/**
 * Get allocation size of a given data-block type and optionally allocation name.
 */
size_t BKE_libblock_get_alloc_info(short type, const char **name)
{
#define CASE_RETURN(id_code, type) \
  case id_code: \
    do { \
      if (name != NULL) { \
        *name = #type; \
      } \
      return sizeof(type); \
    } while (0)

  switch ((ID_Type)type) {
    CASE_RETURN(ID_SCE, Scene);
    CASE_RETURN(ID_LI, Library);
    CASE_RETURN(ID_OB, Object);
    CASE_RETURN(ID_ME, Mesh);
    CASE_RETURN(ID_CU, Curve);
    CASE_RETURN(ID_MB, MetaBall);
    CASE_RETURN(ID_MA, Material);
    CASE_RETURN(ID_TE, Tex);
    CASE_RETURN(ID_IM, Image);
    CASE_RETURN(ID_LT, Lattice);
    CASE_RETURN(ID_LA, Light);
    CASE_RETURN(ID_CA, Camera);
    CASE_RETURN(ID_IP, Ipo);
    CASE_RETURN(ID_KE, Key);
    CASE_RETURN(ID_WO, World);
    CASE_RETURN(ID_SCR, bScreen);
    CASE_RETURN(ID_VF, VFont);
    CASE_RETURN(ID_TXT, Text);
    CASE_RETURN(ID_SPK, Speaker);
    CASE_RETURN(ID_LP, LightProbe);
    CASE_RETURN(ID_SO, bSound);
    CASE_RETURN(ID_GR, Collection);
    CASE_RETURN(ID_AR, bArmature);
    CASE_RETURN(ID_AC, bAction);
    CASE_RETURN(ID_NT, bNodeTree);
    CASE_RETURN(ID_BR, Brush);
    CASE_RETURN(ID_PA, ParticleSettings);
    CASE_RETURN(ID_WM, wmWindowManager);
    CASE_RETURN(ID_GD, bGPdata);
    CASE_RETURN(ID_MC, MovieClip);
    CASE_RETURN(ID_MSK, Mask);
    CASE_RETURN(ID_LS, FreestyleLineStyle);
    CASE_RETURN(ID_PAL, Palette);
    CASE_RETURN(ID_PC, PaintCurve);
    CASE_RETURN(ID_CF, CacheFile);
    CASE_RETURN(ID_WS, WorkSpace);
  }
  return 0;
#undef CASE_RETURN
}

/**
 * Allocates and returns memory of the right size for the specified block type,
 * initialized to zero.
 */
void *BKE_libblock_alloc_notest(short type)
{
  const char *name;
  size_t size = BKE_libblock_get_alloc_info(type, &name);
  if (size != 0) {
    return MEM_callocN(size, name);
  }
  BLI_assert(!"Request to allocate unknown data type");
  return NULL;
}

/**
 * Allocates and returns a block of the specified type, with the specified name
 * (adjusted as necessary to ensure uniqueness), and appended to the specified list.
 * The user count is set to 1, all other content (apart from name and links) being
 * initialized to zero.
 */
void *BKE_libblock_alloc(Main *bmain, short type, const char *name, const int flag)
{
  BLI_assert((flag & LIB_ID_CREATE_NO_ALLOCATE) == 0);

  ID *id = BKE_libblock_alloc_notest(type);

  if (id) {
    if ((flag & LIB_ID_CREATE_NO_MAIN) != 0) {
      id->tag |= LIB_TAG_NO_MAIN;
    }
    if ((flag & LIB_ID_CREATE_NO_USER_REFCOUNT) != 0) {
      id->tag |= LIB_TAG_NO_USER_REFCOUNT;
    }

    id->icon_id = 0;
    *((short *)id->name) = type;
    if ((flag & LIB_ID_CREATE_NO_USER_REFCOUNT) == 0) {
      id->us = 1;
    }
    if ((flag & LIB_ID_CREATE_NO_MAIN) == 0) {
      ListBase *lb = which_libbase(bmain, type);

      BKE_main_lock(bmain);
      BLI_addtail(lb, id);
      BKE_id_new_name_validate(lb, id, name);
      bmain->is_memfile_undo_written = false;
      /* alphabetic insertion: is in new_id */
      BKE_main_unlock(bmain);

      /* TODO to be removed from here! */
      if ((flag & LIB_ID_CREATE_NO_DEG_TAG) == 0) {
        DEG_id_type_tag(bmain, type);
      }
    }
    else {
      BLI_strncpy(id->name + 2, name, sizeof(id->name) - 2);
    }
  }

  return id;
}

/**
 * Initialize an ID of given type, such that it has valid 'empty' data.
 * ID is assumed to be just calloc'ed.
 */
void BKE_libblock_init_empty(ID *id)
{
  /* Note that only ID types that are not valid when filled of zero should have a callback here. */
  switch ((ID_Type)GS(id->name)) {
    case ID_SCE:
      BKE_scene_init((Scene *)id);
      break;
    case ID_LI:
      /* Nothing to do. */
      break;
    case ID_OB: {
      Object *ob = (Object *)id;
      BKE_object_init(ob, OB_EMPTY);
      break;
    }
    case ID_ME:
      BKE_mesh_init((Mesh *)id);
      break;
    case ID_CU:
      BKE_curve_init((Curve *)id, 0);
      break;
    case ID_MB:
      BKE_mball_init((MetaBall *)id);
      break;
    case ID_MA:
      BKE_material_init((Material *)id);
      break;
    case ID_TE:
      BKE_texture_default((Tex *)id);
      break;
    case ID_IM:
      BKE_image_init((Image *)id);
      break;
    case ID_LT:
      BKE_lattice_init((Lattice *)id);
      break;
    case ID_LA:
      BKE_light_init((Light *)id);
      break;
    case ID_SPK:
      BKE_speaker_init((Speaker *)id);
      break;
    case ID_LP:
      BKE_lightprobe_init((LightProbe *)id);
      break;
    case ID_CA:
      BKE_camera_init((Camera *)id);
      break;
    case ID_WO:
      BKE_world_init((World *)id);
      break;
    case ID_SCR:
      /* Nothing to do. */
      break;
    case ID_VF:
      BKE_vfont_init((VFont *)id);
      break;
    case ID_TXT:
      BKE_text_init((Text *)id);
      break;
    case ID_SO:
      /* Another fuzzy case, think NULLified content is OK here... */
      break;
    case ID_GR:
      /* Nothing to do. */
      break;
    case ID_AR:
      /* Nothing to do. */
      break;
    case ID_AC:
      /* Nothing to do. */
      break;
    case ID_NT:
      ntreeInitDefault((bNodeTree *)id);
      break;
    case ID_BR:
      BKE_brush_init((Brush *)id);
      break;
    case ID_PA:
      /* Nothing to do. */
      break;
    case ID_PC:
      /* Nothing to do. */
      break;
    case ID_GD:
      /* Nothing to do. */
      break;
    case ID_MSK:
      /* Nothing to do. */
      break;
    case ID_LS:
      BKE_linestyle_init((FreestyleLineStyle *)id);
      break;
    case ID_CF:
      BKE_cachefile_init((CacheFile *)id);
      break;
    case ID_KE:
      /* Shapekeys are a complex topic too - they depend on their 'user' data type...
       * They are not linkable, though, so it should never reach here anyway. */
      BLI_assert(0);
      break;
    case ID_WM:
      /* We should never reach this. */
      BLI_assert(0);
      break;
    case ID_IP:
      /* Should not be needed - animation from lib pre-2.5 is broken anyway. */
      BLI_assert(0);
      break;
    case ID_PAL:
      BKE_palette_init((Palette *)id);
      break;
    default:
      BLI_assert(0); /* Should never reach this point... */
  }
}

/** Generic helper to create a new empty data-block of given type in given \a bmain database.
 *
 * \param name: can be NULL, in which case we get default name for this ID type. */
void *BKE_id_new(Main *bmain, const short type, const char *name)
{
  BLI_assert(bmain != NULL);

  if (name == NULL) {
    name = DATA_(BKE_idcode_to_name(type));
  }

  ID *id = BKE_libblock_alloc(bmain, type, name, 0);
  BKE_libblock_init_empty(id);

  return id;
}

/**
 * Generic helper to create a new temporary empty data-block of given type,
 * *outside* of any Main database.
 *
 * \param name: can be NULL, in which case we get default name for this ID type. */
void *BKE_id_new_nomain(const short type, const char *name)
{
  if (name == NULL) {
    name = DATA_(BKE_idcode_to_name(type));
  }

  ID *id = BKE_libblock_alloc(NULL,
                              type,
                              name,
                              LIB_ID_CREATE_NO_MAIN | LIB_ID_CREATE_NO_USER_REFCOUNT |
                                  LIB_ID_CREATE_NO_DEG_TAG);
  BKE_libblock_init_empty(id);

  return id;
}

void BKE_libblock_copy_ex(Main *bmain, const ID *id, ID **r_newid, const int orig_flag)
{
  ID *new_id = *r_newid;
  int flag = orig_flag;

  const bool is_private_id_data = (id->flag & LIB_PRIVATE_DATA) != 0;

  BLI_assert((flag & LIB_ID_CREATE_NO_MAIN) != 0 || bmain != NULL);
  BLI_assert((flag & LIB_ID_CREATE_NO_MAIN) != 0 || (flag & LIB_ID_CREATE_NO_ALLOCATE) == 0);
  if (!is_private_id_data) {
    /* When we are handling private ID data, we might still want to manage usercounts, even though
     * that ID data-block is actually outside of Main... */
    BLI_assert((flag & LIB_ID_CREATE_NO_MAIN) == 0 ||
               (flag & LIB_ID_CREATE_NO_USER_REFCOUNT) != 0);
  }
  /* Never implicitly copy shapekeys when generating temp data outside of Main database. */
  BLI_assert((flag & LIB_ID_CREATE_NO_MAIN) == 0 || (flag & LIB_ID_COPY_SHAPEKEY) == 0);

  /* 'Private ID' data handling. */
  if ((bmain != NULL) && is_private_id_data) {
    flag |= LIB_ID_CREATE_NO_MAIN;
  }

  /* The id->flag bits to copy over. */
  const int copy_idflag_mask = LIB_PRIVATE_DATA;

  if ((flag & LIB_ID_CREATE_NO_ALLOCATE) != 0) {
    /* r_newid already contains pointer to allocated memory. */
    /* TODO do we want to memset(0) whole mem before filling it? */
    BLI_strncpy(new_id->name, id->name, sizeof(new_id->name));
    new_id->us = 0;
    new_id->tag |= LIB_TAG_NOT_ALLOCATED | LIB_TAG_NO_MAIN | LIB_TAG_NO_USER_REFCOUNT;
    /* TODO Do we want/need to copy more from ID struct itself? */
  }
  else {
    new_id = BKE_libblock_alloc(bmain, GS(id->name), id->name + 2, flag);
  }
  BLI_assert(new_id != NULL);

  const size_t id_len = BKE_libblock_get_alloc_info(GS(new_id->name), NULL);
  const size_t id_offset = sizeof(ID);
  if ((int)id_len - (int)id_offset > 0) { /* signed to allow neg result */ /* XXX ????? */
    const char *cp = (const char *)id;
    char *cpn = (char *)new_id;

    memcpy(cpn + id_offset, cp + id_offset, id_len - id_offset);
  }

  new_id->flag = (new_id->flag & ~copy_idflag_mask) | (id->flag & copy_idflag_mask);

  if (id->properties) {
    new_id->properties = IDP_CopyProperty_ex(id->properties, flag);
  }

  /* XXX Again... We need a way to control what we copy in a much more refined way.
   * We cannot always copy this, some internal copying will die on it! */
  /* For now, upper level code will have to do that itself when required. */
#if 0
  if (id->override != NULL) {
    BKE_override_copy(new_id, id);
  }
#endif

  if (id_can_have_animdata(new_id)) {
    IdAdtTemplate *iat = (IdAdtTemplate *)new_id;

    /* the duplicate should get a copy of the animdata */
    if ((flag & LIB_ID_COPY_NO_ANIMDATA) == 0) {
      /* Note that even though horrors like root nodetrees are not in bmain, the actions they use
       * in their anim data *are* in bmain... super-mega-hooray. */
      int animdata_flag = orig_flag;
      BLI_assert((animdata_flag & LIB_ID_COPY_ACTIONS) == 0 ||
                 (animdata_flag & LIB_ID_CREATE_NO_MAIN) == 0);
      iat->adt = BKE_animdata_copy(bmain, iat->adt, animdata_flag);
    }
    else {
      iat->adt = NULL;
    }
  }

  if ((flag & LIB_ID_CREATE_NO_DEG_TAG) == 0 && (flag & LIB_ID_CREATE_NO_MAIN) == 0) {
    DEG_id_type_tag(bmain, GS(new_id->name));
  }

  *r_newid = new_id;
}

/* used everywhere in blenkernel */
void *BKE_libblock_copy(Main *bmain, const ID *id)
{
  ID *idn;

  BKE_libblock_copy_ex(bmain, id, &idn, 0);

  return idn;
}

/* XXX TODO: get rid of this useless wrapper at some point... */
void *BKE_libblock_copy_for_localize(const ID *id)
{
  ID *idn;
  BKE_libblock_copy_ex(NULL, id, &idn, LIB_ID_COPY_LOCALIZE | LIB_ID_COPY_NO_ANIMDATA);
  return idn;
}

void BKE_library_free(Library *lib)
{
  if (lib->packedfile) {
    BKE_packedfile_free(lib->packedfile);
  }
}

/* ***************** ID ************************ */
ID *BKE_libblock_find_name(struct Main *bmain, const short type, const char *name)
{
  ListBase *lb = which_libbase(bmain, type);
  BLI_assert(lb != NULL);
  return BLI_findstring(lb, name, offsetof(ID, name) + 2);
}

void id_sort_by_name(ListBase *lb, ID *id)
{
  ID *idtest;

  /* insert alphabetically */
  if (lb->first != lb->last) {
    BLI_remlink(lb, id);

    idtest = lb->first;
    while (idtest) {
      if (BLI_strcasecmp(idtest->name, id->name) > 0 || (idtest->lib && !id->lib)) {
        BLI_insertlinkbefore(lb, idtest, id);
        break;
      }
      idtest = idtest->next;
    }
    /* as last */
    if (idtest == NULL) {
      BLI_addtail(lb, id);
    }
  }
}

/**
 * Check to see if there is an ID with the same name as 'name'.
 * Returns the ID if so, if not, returns NULL
 */
static ID *is_dupid(ListBase *lb, ID *id, const char *name)
{
  ID *idtest = NULL;

  for (idtest = lb->first; idtest; idtest = idtest->next) {
    /* if idtest is not a lib */
    if (id != idtest && !ID_IS_LINKED(idtest)) {
      /* do not test alphabetic! */
      /* optimized */
      if (idtest->name[2] == name[0]) {
        if (STREQ(name, idtest->name + 2)) {
          break;
        }
      }
    }
  }

  return idtest;
}

/**
 * Check to see if an ID name is already used, and find a new one if so.
 * Return true if created a new name (returned in name).
 *
 * Normally the ID that's being check is already in the ListBase, so ID *id
 * points at the new entry.  The Python Library module needs to know what
 * the name of a data-block will be before it is appended; in this case ID *id
 * id is NULL
 */

static bool check_for_dupid(ListBase *lb, ID *id, char *name)
{
  ID *idtest;
  int nr = 0, a;
  size_t left_len;
#define MAX_IN_USE 64
  bool in_use[MAX_IN_USE];
  /* to speed up finding unused numbers within [1 .. MAX_IN_USE - 1] */

  char left[MAX_ID_NAME + 8], leftest[MAX_ID_NAME + 8];

  while (true) {

    /* phase 1: id already exists? */
    idtest = is_dupid(lb, id, name);

    /* if there is no double, done */
    if (idtest == NULL) {
      return false;
    }

    /* we have a dup; need to make a new name */
    /* quick check so we can reuse one of first MAX_IN_USE - 1 ids if vacant */
    memset(in_use, false, sizeof(in_use));

    /* get name portion, number portion ("name.number") */
    left_len = BLI_split_name_num(left, &nr, name, '.');

    /* if new name will be too long, truncate it */
    if (nr > 999 && left_len > (MAX_ID_NAME - 8)) { /* assumption: won't go beyond 9999 */
      left[MAX_ID_NAME - 8] = '\0';
      left_len = MAX_ID_NAME - 8;
    }
    else if (left_len > (MAX_ID_NAME - 7)) {
      left[MAX_ID_NAME - 7] = '\0';
      left_len = MAX_ID_NAME - 7;
    }

    /* Code above may have generated invalid utf-8 string, due to raw truncation.
     * Ensure we get a valid one now! */
    left_len -= (size_t)BLI_utf8_invalid_strip(left, left_len);

    for (idtest = lb->first; idtest; idtest = idtest->next) {
      int nrtest;
      if ((id != idtest) && !ID_IS_LINKED(idtest) && (*name == *(idtest->name + 2)) &&
          STREQLEN(name, idtest->name + 2, left_len) &&
          (BLI_split_name_num(leftest, &nrtest, idtest->name + 2, '.') == left_len)) {
        /* will get here at least once, otherwise is_dupid call above would have returned NULL */
        if (nrtest < MAX_IN_USE) {
          in_use[nrtest] = true; /* mark as used */
        }
        if (nr <= nrtest) {
          nr = nrtest + 1; /* track largest unused */
        }
      }
    }
    /* At this point, 'nr' will typically be at least 1. (but not always) */
    // BLI_assert(nr >= 1);

    /* decide which value of nr to use */
    for (a = 0; a < MAX_IN_USE; a++) {
      if (a >= nr) {
        break; /* stop when we've checked up to biggest */ /* redundant check */
      }
      if (!in_use[a]) { /* found an unused value */
        nr = a;
        /* can only be zero if all potential duplicate names had
         * nonzero numeric suffixes, which means name itself has
         * nonzero numeric suffix (else no name conflict and wouldn't
         * have got here), which means name[left_len] is not a null */
        break;
      }
    }
    /* At this point, nr is either the lowest unused number within [0 .. MAX_IN_USE - 1],
     * or 1 greater than the largest used number if all those low ones are taken.
     * We can't be bothered to look for the lowest unused number beyond (MAX_IN_USE - 1). */

    /* If the original name has no numeric suffix,
     * rather than just chopping and adding numbers,
     * shave off the end chars until we have a unique name.
     * Check the null terminators match as well so we don't get Cube.000 -> Cube.00 */
    if (nr == 0 && name[left_len] == '\0') {
      size_t len;
      /* FIXME: this code will never be executed, because either nr will be
       * at least 1, or name will not end at left_len! */
      BLI_assert(0);

      len = left_len - 1;
      idtest = is_dupid(lb, id, name);

      while (idtest && len > 1) {
        name[len--] = '\0';
        idtest = is_dupid(lb, id, name);
      }
      if (idtest == NULL) {
        return true;
      }
      /* otherwise just continue and use a number suffix */
    }

    if (nr > 999 && left_len > (MAX_ID_NAME - 8)) {
      /* this would overflow name buffer */
      left[MAX_ID_NAME - 8] = 0;
      /* left_len = MAX_ID_NAME - 8; */ /* for now this isn't used again */
      memcpy(name, left, sizeof(char) * (MAX_ID_NAME - 7));
      continue;
    }
    /* this format specifier is from hell... */
    BLI_snprintf(name, sizeof(id->name) - 2, "%s.%.3d", left, nr);

    return true;
  }

#undef MAX_IN_USE
}

/**
 * Ensures given ID has a unique name in given listbase.
 *
 * Only for local IDs (linked ones already have a unique ID in their library).
 *
 * \return true if a new name had to be created.
 */
bool BKE_id_new_name_validate(ListBase *lb, ID *id, const char *tname)
{
  bool result;
  char name[MAX_ID_NAME - 2];

  /* if library, don't rename */
  if (ID_IS_LINKED(id)) {
    return false;
  }

  /* if no name given, use name of current ID
   * else make a copy (tname args can be const) */
  if (tname == NULL) {
    tname = id->name + 2;
  }

  BLI_strncpy(name, tname, sizeof(name));

  if (name[0] == '\0') {
    /* Disallow empty names. */
    BLI_strncpy(name, DATA_(BKE_idcode_to_name(GS(id->name))), sizeof(name));
  }
  else {
    /* disallow non utf8 chars,
     * the interface checks for this but new ID's based on file names don't */
    BLI_utf8_invalid_strip(name, strlen(name));
  }

  result = check_for_dupid(lb, id, name);
  strcpy(id->name + 2, name);

  /* This was in 2.43 and previous releases
   * however all data in blender should be sorted, not just duplicate names
   * sorting should not hurt, but noting just in case it alters the way other
   * functions work, so sort every time. */
#if 0
  if (result) {
    id_sort_by_name(lb, id);
  }
#endif

  id_sort_by_name(lb, id);

  return result;
}

/**
 * Pull an ID out of a library (make it local). Only call this for IDs that
 * don't have other library users.
 */
void id_clear_lib_data_ex(Main *bmain, ID *id, const bool id_in_mainlist)
{
  bNodeTree *ntree = NULL;
  Key *key = NULL;

  BKE_id_lib_local_paths(bmain, id->lib, id);

  id_fake_user_clear(id);

  id->lib = NULL;
  id->tag &= ~(LIB_TAG_INDIRECT | LIB_TAG_EXTERN);
  id->flag &= ~LIB_INDIRECT_WEAK_LINK;
  if (id_in_mainlist) {
    if (BKE_id_new_name_validate(which_libbase(bmain, GS(id->name)), id, NULL)) {
      bmain->is_memfile_undo_written = false;
    }
  }

  /* Internal bNodeTree blocks inside data-blocks also stores id->lib,
   * make sure this stays in sync. */
  if ((ntree = ntreeFromID(id))) {
    id_clear_lib_data_ex(bmain, &ntree->id, false); /* Datablocks' nodetree is never in Main. */
  }

  /* Same goes for shapekeys. */
  if ((key = BKE_key_from_id(id))) {
    id_clear_lib_data_ex(bmain, &key->id, id_in_mainlist); /* sigh, why are keys in Main? */
  }
}

void id_clear_lib_data(Main *bmain, ID *id)
{
  id_clear_lib_data_ex(bmain, id, true);
}

/* next to indirect usage in read/writefile also in editobject.c scene.c */
void BKE_main_id_clear_newpoins(Main *bmain)
{
  ID *id;

  FOREACH_MAIN_ID_BEGIN (bmain, id) {
    id->newid = NULL;
    id->tag &= ~LIB_TAG_NEW;
  }
  FOREACH_MAIN_ID_END;
}

static int id_refcount_recompute_callback(void *user_data,
                                          struct ID *UNUSED(id_self),
                                          struct ID **id_pointer,
                                          int cb_flag)
{
  const bool do_linked_only = (bool)POINTER_AS_INT(user_data);

  if (*id_pointer == NULL) {
    return IDWALK_RET_NOP;
  }
  if (do_linked_only && !ID_IS_LINKED(*id_pointer)) {
    return IDWALK_RET_NOP;
  }

  if (cb_flag & IDWALK_CB_USER) {
    /* Do not touch to direct/indirect linked status here... */
    id_us_plus_no_lib(*id_pointer);
  }
  if (cb_flag & IDWALK_CB_USER_ONE) {
    id_us_ensure_real(*id_pointer);
  }

  return IDWALK_RET_NOP;
}

void BKE_main_id_refcount_recompute(struct Main *bmain, const bool do_linked_only)
{
  ID *id;

  FOREACH_MAIN_ID_BEGIN (bmain, id) {
    if (!ID_IS_LINKED(id) && do_linked_only) {
      continue;
    }
    id->us = ID_FAKE_USERS(id);
    /* Note that we keep EXTRAUSER tag here, since some UI users may define it too... */
    if (id->tag & LIB_TAG_EXTRAUSER) {
      id->tag &= ~(LIB_TAG_EXTRAUSER | LIB_TAG_EXTRAUSER_SET);
      id_us_ensure_real(id);
    }
  }
  FOREACH_MAIN_ID_END;

  /* Go over whole Main database to re-generate proper usercounts... */
  FOREACH_MAIN_ID_BEGIN (bmain, id) {
    BKE_library_foreach_ID_link(bmain,
                                id,
                                id_refcount_recompute_callback,
                                POINTER_FROM_INT((int)do_linked_only),
                                IDWALK_READONLY);
  }
  FOREACH_MAIN_ID_END;
}

static void library_make_local_copying_check(ID *id,
                                             GSet *loop_tags,
                                             MainIDRelations *id_relations,
                                             GSet *done_ids)
{
  if (BLI_gset_haskey(done_ids, id)) {
    return; /* Already checked, nothing else to do. */
  }

  MainIDRelationsEntry *entry = BLI_ghash_lookup(id_relations->id_used_to_user, id);
  BLI_gset_insert(loop_tags, id);
  for (; entry != NULL; entry = entry->next) {

    /* Used_to_user stores ID pointer, not pointer to ID pointer. */
    ID *par_id = (ID *)entry->id_pointer;

    /* Our oh-so-beloved 'from' pointers... */
    if (entry->usage_flag & IDWALK_CB_LOOPBACK) {
      /* We totally disregard Object->proxy_from 'usage' here,
       * this one would only generate fake positives. */
      if (GS(par_id->name) == ID_OB) {
        BLI_assert(((Object *)par_id)->proxy_from == (Object *)id);
        continue;
      }

      /* Shapekeys are considered 'private' to their owner ID here, and never tagged
       * (since they cannot be linked), * so we have to switch effective parent to their owner.
       */
      if (GS(par_id->name) == ID_KE) {
        par_id = ((Key *)par_id)->from;
      }
    }

    if (par_id->lib == NULL) {
      /* Local user, early out to avoid some gset querying... */
      continue;
    }
    if (!BLI_gset_haskey(done_ids, par_id)) {
      if (BLI_gset_haskey(loop_tags, par_id)) {
        /* We are in a 'dependency loop' of IDs, this does not say us anything, skip it.
         * Note that this is the situation that can lead to archipelagoes of linked data-blocks
         * (since all of them have non-local users, they would all be duplicated,
         * leading to a loop of unused linked data-blocks that cannot be freed since they all use
         * each other...). */
        continue;
      }
      /* Else, recursively check that user ID. */
      library_make_local_copying_check(par_id, loop_tags, id_relations, done_ids);
    }

    if (par_id->tag & LIB_TAG_DOIT) {
      /* This user will be fully local in future, so far so good,
       * nothing to do here but check next user. */
    }
    else {
      /* This user won't be fully local in future, so current ID won't be either.
       * And we are done checking it. */
      id->tag &= ~LIB_TAG_DOIT;
      break;
    }
  }
  BLI_gset_add(done_ids, id);
  BLI_gset_remove(loop_tags, id, NULL);
}

/** Make linked data-blocks local.
 *
 * \param bmain: Almost certainly global main.
 * \param lib: If not NULL, only make local data-blocks from this library.
 * \param untagged_only: If true, only make local data-blocks not tagged with
 * LIB_TAG_PRE_EXISTING.
 * \param set_fake: If true, set fake user on all localized data-blocks
 * (except group and objects ones).
 */
/* Note: Old (2.77) version was simply making (tagging) data-blocks as local,
 * without actually making any check whether they were also indirectly used or not...
 *
 * Current version uses regular id_make_local callback, with advanced pre-processing step to
 * detect all cases of IDs currently indirectly used, but which will be used by local data only
 * once this function is finished.  This allows to avoid any unneeded duplication of IDs, and
 * hence all time lost afterwards to remove orphaned linked data-blocks...
 */
void BKE_library_make_local(Main *bmain,
                            const Library *lib,
                            GHash *old_to_new_ids,
                            const bool untagged_only,
                            const bool set_fake)
{
  ListBase *lbarray[MAX_LIBARRAY];

  LinkNode *todo_ids = NULL;
  LinkNode *copied_ids = NULL;
  MemArena *linklist_mem = BLI_memarena_new(512 * sizeof(*todo_ids), __func__);

  GSet *done_ids = BLI_gset_ptr_new(__func__);

#ifdef DEBUG_TIME
  TIMEIT_START(make_local);
#endif

  BKE_main_relations_create(bmain);

#ifdef DEBUG_TIME
  printf("Pre-compute current ID relations: Done.\n");
  TIMEIT_VALUE_PRINT(make_local);
#endif

  /* Step 1: Detect data-blocks to make local. */
  for (int a = set_listbasepointers(bmain, lbarray); a--;) {
    ID *id = lbarray[a]->first;

    /* Do not explicitly make local non-linkable IDs (shapekeys, in fact),
     * they are assumed to be handled by real data-blocks responsible of them. */
    const bool do_skip = (id && !BKE_idcode_is_linkable(GS(id->name)));

    for (; id; id = id->next) {
      ID *ntree = (ID *)ntreeFromID(id);

      id->tag &= ~LIB_TAG_DOIT;
      if (ntree != NULL) {
        ntree->tag &= ~LIB_TAG_DOIT;
      }

      if (id->lib == NULL) {
        id->tag &= ~(LIB_TAG_EXTERN | LIB_TAG_INDIRECT | LIB_TAG_NEW);
        id->flag &= ~LIB_INDIRECT_WEAK_LINK;
      }
      /* The check on the fourth line (LIB_TAG_PRE_EXISTING) is done so it's possible to tag data
       * you don't want to be made local, used for appending data,
       * so any libdata already linked wont become local (very nasty
       * to discover all your links are lost after appending).
       * Also, never ever make proxified objects local, would not make any sense. */
      /* Some more notes:
       *   - Shapekeys are never tagged here (since they are not linkable).
       *   - Nodetrees used in materials etc. have to be tagged manually,
       *     since they do not exist in Main (!).
       * This is ok-ish on 'make local' side of things
       * (since those are handled by their 'owner' IDs),
       * but complicates slightly the pre-processing of relations between IDs at step 2... */
      else if (!do_skip && id->tag & (LIB_TAG_EXTERN | LIB_TAG_INDIRECT | LIB_TAG_NEW) &&
               ELEM(lib, NULL, id->lib) &&
               !(GS(id->name) == ID_OB && ((Object *)id)->proxy_from != NULL) &&
               ((untagged_only == false) || !(id->tag & LIB_TAG_PRE_EXISTING))) {
        BLI_linklist_prepend_arena(&todo_ids, id, linklist_mem);
        id->tag |= LIB_TAG_DOIT;

        /* Tag those nasty non-ID nodetrees,
         * but do not add them to todo list, making them local is handled by 'owner' ID.
         * This is needed for library_make_local_copying_check() to work OK at step 2. */
        if (ntree != NULL) {
          ntree->tag |= LIB_TAG_DOIT;
        }
      }
      else {
        /* Linked ID that we won't be making local (needed info for step 2, see below). */
        BLI_gset_add(done_ids, id);
      }
    }
  }

#ifdef DEBUG_TIME
  printf("Step 1: Detect data-blocks to make local: Done.\n");
  TIMEIT_VALUE_PRINT(make_local);
#endif

  /* Step 2: Check which data-blocks we can directly make local
   * (because they are only used by already, or future, local data),
   * others will need to be duplicated. */
  GSet *loop_tags = BLI_gset_ptr_new(__func__);
  for (LinkNode *it = todo_ids; it; it = it->next) {
    library_make_local_copying_check(it->link, loop_tags, bmain->relations, done_ids);
    BLI_assert(BLI_gset_len(loop_tags) == 0);
  }
  BLI_gset_free(loop_tags, NULL);
  BLI_gset_free(done_ids, NULL);

  /* Next step will most likely add new IDs, better to get rid of this mapping now. */
  BKE_main_relations_free(bmain);

#ifdef DEBUG_TIME
  printf("Step 2: Check which data-blocks we can directly make local: Done.\n");
  TIMEIT_VALUE_PRINT(make_local);
#endif

  /* Step 3: Make IDs local, either directly (quick and simple), or using generic process,
   * which involves more complex checks and might instead
   * create a local copy of original linked ID. */
  for (LinkNode *it = todo_ids, *it_next; it; it = it_next) {
    it_next = it->next;
    ID *id = it->link;

    if (id->tag & LIB_TAG_DOIT) {
      /* We know all users of this object are local or will be made fully local, even if
       * currently there are some indirect usages. So instead of making a copy that we'll likely
       * get rid of later, directly make that data block local.
       * Saves a tremendous amount of time with complex scenes... */
      id_clear_lib_data_ex(bmain, id, true);
      BKE_id_expand_local(bmain, id);
      id->tag &= ~LIB_TAG_DOIT;

      if (GS(id->name) == ID_OB) {
        BKE_rigidbody_ensure_local_object(bmain, (Object *)id);
      }
    }
    else {
      /* In this specific case, we do want to make ID local even if it has no local usage yet...
       */
      if (GS(id->name) == ID_OB) {
        /* Special case for objects because we don't want proxy pointers to be
         * cleared yet. This will happen down the road in this function.
         */
        BKE_object_make_local_ex(bmain, (Object *)id, true, false);
      }
      else {
        id_make_local(bmain, id, false, true);
      }

      if (id->newid) {
        if (GS(id->newid->name) == ID_OB) {
          BKE_rigidbody_ensure_local_object(bmain, (Object *)id->newid);
        }

        /* Reuse already allocated LinkNode (transferring it from todo_ids to copied_ids). */
        BLI_linklist_prepend_nlink(&copied_ids, id, it);
      }
    }

    if (set_fake) {
      if (!ELEM(GS(id->name), ID_OB, ID_GR)) {
        /* do not set fake user on objects, groups (instancing) */
        id_fake_user_set(id);
      }
    }
  }

#ifdef DEBUG_TIME
  printf("Step 3: Make IDs local: Done.\n");
  TIMEIT_VALUE_PRINT(make_local);
#endif

  /* At this point, we are done with directly made local IDs.
   * Now we have to handle duplicated ones, since their
   * remaining linked original counterpart may not be needed anymore... */
  todo_ids = NULL;

  /* Step 4: We have to remap local usages of old (linked) ID to new (local)
   * ID in a separated loop,
   * as lbarray ordering is not enough to ensure us we did catch all dependencies
   * (e.g. if making local a parent object before its child...). See T48907. */
  /* TODO This is now the biggest step by far (in term of processing time).
   * We may be able to gain here by using again main->relations mapping, but...
   * this implies BKE_libblock_remap & co to be able to update main->relations on the fly.
   * Have to think about it a bit more, and see whether new code is OK first, anyway. */
  for (LinkNode *it = copied_ids; it; it = it->next) {
    ID *id = it->link;

    BLI_assert(id->newid != NULL);
    BLI_assert(id->lib != NULL);

    BKE_libblock_remap(bmain, id, id->newid, ID_REMAP_SKIP_INDIRECT_USAGE);
    if (old_to_new_ids) {
      BLI_ghash_insert(old_to_new_ids, id, id->newid);
    }

    /* Special hack for groups... Thing is, since we can't instantiate them here, we need to
     * ensure they remain 'alive' (only instantiation is a real group 'user'... *sigh* See
     * T49722. */
    if (GS(id->name) == ID_GR && (id->tag & LIB_TAG_INDIRECT) != 0) {
      id_us_ensure_real(id->newid);
    }
  }

#ifdef DEBUG_TIME
  printf("Step 4: Remap local usages of old (linked) ID to new (local) ID: Done.\n");
  TIMEIT_VALUE_PRINT(make_local);
#endif

  /* Step 5: proxy 'remapping' hack. */
  for (LinkNode *it = copied_ids; it; it = it->next) {
    ID *id = it->link;

    /* Attempt to re-link copied proxy objects. This allows appending of an entire scene
     * from another blend file into this one, even when that blend file contains proxified
     * armatures that have local references. Since the proxified object needs to be linked
     * (not local), this will only work when the "Localize all" checkbox is disabled.
     * TL;DR: this is a dirty hack on top of an already weak feature (proxies). */
    if (GS(id->name) == ID_OB && ((Object *)id)->proxy != NULL) {
      Object *ob = (Object *)id;
      Object *ob_new = (Object *)id->newid;
      bool is_local = false, is_lib = false;

      /* Proxies only work when the proxified object is linked-in from a library. */
      if (ob->proxy->id.lib == NULL) {
        CLOG_WARN(&LOG,
                  "proxy object %s will loose its link to %s, because the "
                  "proxified object is local.",
                  id->newid->name,
                  ob->proxy->id.name);
        continue;
      }

      BKE_library_ID_test_usages(bmain, id, &is_local, &is_lib);

      /* We can only switch the proxy'ing to a made-local proxy if it is no longer
       * referred to from a library. Not checking for local use; if new local proxy
       * was not used locally would be a nasty bug! */
      if (is_local || is_lib) {
        CLOG_WARN(&LOG,
                  "made-local proxy object %s will loose its link to %s, "
                  "because the linked-in proxy is referenced (is_local=%i, is_lib=%i).",
                  id->newid->name,
                  ob->proxy->id.name,
                  is_local,
                  is_lib);
      }
      else {
        /* we can switch the proxy'ing from the linked-in to the made-local proxy.
         * BKE_object_make_proxy() shouldn't be used here, as it allocates memory that
         * was already allocated by BKE_object_make_local_ex() (which called BKE_object_copy). */
        ob_new->proxy = ob->proxy;
        ob_new->proxy_group = ob->proxy_group;
        ob_new->proxy_from = ob->proxy_from;
        ob_new->proxy->proxy_from = ob_new;
        ob->proxy = ob->proxy_from = ob->proxy_group = NULL;
      }
    }
  }

#ifdef DEBUG_TIME
  printf("Step 5: Proxy 'remapping' hack: Done.\n");
  TIMEIT_VALUE_PRINT(make_local);
#endif

  /* This is probably more of a hack than something we should do here, but...
   * Issue is, the whole copying + remapping done in complex cases above may leave pose-channels
   * of armatures in complete invalid state (more precisely, the bone pointers of the
   * pose-channels - very crappy cross-data-blocks relationship), se we tag it to be fully
   * recomputed, but this does not seems to be enough in some cases, and evaluation code ends up
   * trying to evaluate a not-yet-updated armature object's deformations.
   * Try "make all local" in 04_01_H.lighting.blend from Agent327 without this, e.g. */
  for (Object *ob = bmain->objects.first; ob; ob = ob->id.next) {
    if (ob->data != NULL && ob->type == OB_ARMATURE && ob->pose != NULL &&
        ob->pose->flag & POSE_RECALC) {
      BKE_pose_rebuild(bmain, ob, ob->data, true);
    }
  }

#ifdef DEBUG_TIME
  printf("Hack: Forcefully rebuild armature object poses: Done.\n");
  TIMEIT_VALUE_PRINT(make_local);
#endif

  BKE_main_id_clear_newpoins(bmain);
  BLI_memarena_free(linklist_mem);

#ifdef DEBUG_TIME
  printf("Cleanup and finish: Done.\n");
  TIMEIT_END(make_local);
#endif
}

/**
 * Use after setting the ID's name
 * When name exists: call 'new_id'
 */
void BLI_libblock_ensure_unique_name(Main *bmain, const char *name)
{
  ListBase *lb;
  ID *idtest;

  lb = which_libbase(bmain, GS(name));
  if (lb == NULL) {
    return;
  }

  /* search for id */
  idtest = BLI_findstring(lb, name + 2, offsetof(ID, name) + 2);
  if (idtest != NULL) {
    /* BKE_id_new_name_validate also takes care of sorting. */
    BKE_id_new_name_validate(lb, idtest, NULL);
    bmain->is_memfile_undo_written = false;
  }
}

/**
 * Sets the name of a block to name, suitably adjusted for uniqueness.
 */
void BKE_libblock_rename(Main *bmain, ID *id, const char *name)
{
  ListBase *lb = which_libbase(bmain, GS(id->name));
  if (BKE_id_new_name_validate(lb, id, name)) {
    bmain->is_memfile_undo_written = false;
  }
}

/**
 * Generate full name of the data-block (without ID code, but with library if any).
 *
 * \note Result is unique to a given ID type in a given Main database.
 *
 * \param name: An allocated string of minimal length #MAX_ID_FULL_NAME,
 * will be filled with generated string.
 */
void BKE_id_full_name_get(char name[MAX_ID_FULL_NAME], const ID *id)
{
  strcpy(name, id->name + 2);

  if (id->lib != NULL) {
    const size_t idname_len = strlen(id->name + 2);
    const size_t libname_len = strlen(id->lib->id.name + 2);

    name[idname_len] = ' ';
    name[idname_len + 1] = '[';
    strcpy(name + idname_len + 2, id->lib->id.name + 2);
    name[idname_len + 2 + libname_len] = ']';
    name[idname_len + 2 + libname_len + 1] = '\0';
  }
}

/**
 * Generate full name of the data-block (without ID code, but with library if any),
 * with a 3-character prefix prepended indicating whether it comes from a library,
 * is overriding, has a fake or no user, etc.
 *
 * \note Result is unique to a given ID type in a given Main database.
 *
 * \param name: An allocated string of minimal length #MAX_ID_FULL_NAME_UI,
 * will be filled with generated string.
 */
void BKE_id_full_name_ui_prefix_get(char name[MAX_ID_FULL_NAME_UI], const ID *id)
{
  name[0] = id->lib ? (ID_MISSING(id) ? 'M' : 'L') : ID_IS_OVERRIDE_LIBRARY(id) ? 'O' : ' ';
  name[1] = (id->flag & LIB_FAKEUSER) ? 'F' : ((id->us == 0) ? '0' : ' ');
  name[2] = ' ';

  BKE_id_full_name_get(name + 3, id);
}

/**
 * Generate a concatenation of ID name (including two-chars type code) and its lib name, if any.
 *
 * \return A unique allocated string key for any ID in the whole Main database.
 */
char *BKE_id_to_unique_string_key(const struct ID *id)
{
  if (id->lib == NULL) {
    return BLI_strdup(id->name);
  }
  else {
    /* Prefix with an ascii character in the range of 32..96 (visible)
     * this ensures we can't have a library ID pair that collide.
     * Where 'LIfooOBbarOBbaz' could be ('LIfoo, OBbarOBbaz') or ('LIfooOBbar', 'OBbaz'). */
    const char ascii_len = strlen(id->lib->id.name + 2) + 32;
    return BLI_sprintfN("%c%s%s", ascii_len, id->lib->id.name, id->name);
  }
}

void BKE_library_filepath_set(Main *bmain, Library *lib, const char *filepath)
{
  /* in some cases this is used to update the absolute path from the
   * relative */
  if (lib->name != filepath) {
    BLI_strncpy(lib->name, filepath, sizeof(lib->name));
  }

  BLI_strncpy(lib->filepath, filepath, sizeof(lib->filepath));

  /* not essential but set filepath is an absolute copy of value which
   * is more useful if its kept in sync */
  if (BLI_path_is_rel(lib->filepath)) {
    /* note that the file may be unsaved, in this case, setting the
     * filepath on an indirectly linked path is not allowed from the
     * outliner, and its not really supported but allow from here for now
     * since making local could cause this to be directly linked - campbell
     */
    /* Never make paths relative to parent lib - reading code (blenloader) always set *all*
     * lib->name relative to current main, not to their parent for indirectly linked ones. */
    const char *basepath = BKE_main_blendfile_path(bmain);
    BLI_path_abs(lib->filepath, basepath);
  }
}

void BKE_id_tag_set_atomic(ID *id, int tag)
{
  atomic_fetch_and_or_int32(&id->tag, tag);
}

void BKE_id_tag_clear_atomic(ID *id, int tag)
{
  atomic_fetch_and_and_int32(&id->tag, ~tag);
}

/** Check that given ID pointer actually is in G_MAIN.
 * Main intended use is for debug asserts in places we cannot easily get rid of G_Main... */
bool BKE_id_is_in_global_main(ID *id)
{
  /* We do not want to fail when id is NULL here, even though this is a bit strange behavior...
   */
  return (id == NULL || BLI_findindex(which_libbase(G_MAIN, GS(id->name)), id) != -1);
}

/************************* Datablock order in UI **************************/

static int *id_order_get(ID *id)
{
  /* Only for workspace tabs currently. */
  switch (GS(id->name)) {
    case ID_WS:
      return &((WorkSpace *)id)->order;
    default:
      return NULL;
  }
}

static int id_order_compare(const void *a, const void *b)
{
  ID *id_a = ((LinkData *)a)->data;
  ID *id_b = ((LinkData *)b)->data;

  int *order_a = id_order_get(id_a);
  int *order_b = id_order_get(id_b);

  if (order_a && order_b) {
    if (*order_a < *order_b) {
      return -1;
    }
    else if (*order_a > *order_b) {
      return 1;
    }
  }

  return strcmp(id_a->name, id_b->name);
}

/**
 * Returns ordered list of data-blocks for display in the UI.
 * Result is list of LinkData of IDs that must be freed.
 */
void BKE_id_ordered_list(ListBase *ordered_lb, const ListBase *lb)
{
  BLI_listbase_clear(ordered_lb);

  for (ID *id = lb->first; id; id = id->next) {
    BLI_addtail(ordered_lb, BLI_genericNodeN(id));
  }

  BLI_listbase_sort(ordered_lb, id_order_compare);

  int num = 0;
  for (LinkData *link = ordered_lb->first; link; link = link->next) {
    int *order = id_order_get(link->data);
    if (order) {
      *order = num++;
    }
  }
}

/**
 * Reorder ID in the list, before or after the "relative" ID.
 */
void BKE_id_reorder(const ListBase *lb, ID *id, ID *relative, bool after)
{
  int *id_order = id_order_get(id);
  int relative_order;

  if (relative) {
    relative_order = *id_order_get(relative);
  }
  else {
    relative_order = (after) ? BLI_listbase_count(lb) : 0;
  }

  if (after) {
    /* Insert after. */
    for (ID *other = lb->first; other; other = other->next) {
      int *order = id_order_get(other);
      if (*order > relative_order) {
        (*order)++;
      }
    }

    *id_order = relative_order + 1;
  }
  else {
    /* Insert before. */
    for (ID *other = lb->first; other; other = other->next) {
      int *order = id_order_get(other);
      if (*order < relative_order) {
        (*order)--;
      }
    }

    *id_order = relative_order - 1;
  }
}