readfile_tempload.cc

Go to the documentation of this file.

/* SPDX-FileCopyrightText: 2023 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */
 
#include "BLO_readfile.hh"
 
#include "MEM_guardedalloc.h"
 
#include "BLI_string.h"
 
#include "BKE_main.hh"
 
#include "DNA_ID.h"
 
TempLibraryContext *BLO_library_temp_load_id(Main *real_main,
                                             const char *blend_file_path,
                                             const short idcode,
                                             const char *idname,
                                             ReportList *reports)
{
  TempLibraryContext *temp_lib_ctx = static_cast<TempLibraryContext *>(
      MEM_callocN(sizeof(*temp_lib_ctx), __func__));
  temp_lib_ctx->bmain_base = BKE_main_new();
  temp_lib_ctx->bf_reports.reports = reports;
 
  /* Copy the file path so any path remapping is performed properly. */
  STRNCPY(temp_lib_ctx->bmain_base->filepath, real_main->filepath);
 
  temp_lib_ctx->blendhandle = BLO_blendhandle_from_file(blend_file_path,
                                                        &temp_lib_ctx->bf_reports);
 
  BLO_library_link_params_init(
      &temp_lib_ctx->liblink_params, temp_lib_ctx->bmain_base, 0, ID_TAG_TEMP_MAIN);
 
  temp_lib_ctx->bmain_lib = BLO_library_link_begin(
      &temp_lib_ctx->blendhandle, blend_file_path, &temp_lib_ctx->liblink_params);
 
  temp_lib_ctx->temp_id = BLO_library_link_named_part(temp_lib_ctx->bmain_lib,
                                                      &temp_lib_ctx->blendhandle,
                                                      idcode,
                                                      idname,
                                                      &temp_lib_ctx->liblink_params);
 
  return temp_lib_ctx;
}
 
void BLO_library_temp_free(TempLibraryContext *temp_lib_ctx)
{
  /* This moves the temporary ID and any indirectly loaded data into `bmain_base`
   * only to free `bmain_base`, while redundant this is the typical code-path for library linking,
   * it's more convenient to follow this convention rather than create a new code-path for this
   * one-off use case. */
  BLO_library_link_end(
      temp_lib_ctx->bmain_lib, &temp_lib_ctx->blendhandle, &temp_lib_ctx->liblink_params);
  BLO_blendhandle_close(temp_lib_ctx->blendhandle);
  BKE_main_free(temp_lib_ctx->bmain_base);
  MEM_freeN(temp_lib_ctx);
}