thumbs_blend.cc

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/* SPDX-FileCopyrightText: 2024 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */
 
#include <cstdio>
#include <cstdlib>
#include <cstring>
 
#include "BLI_listbase.h" /* Needed due to import of BLO_readfile.hh */
#include "BLI_utildefines.h"
 
#include "BLO_readfile.hh"
 
#include "BKE_idtype.hh"
#include "BKE_main.hh"
#include "BKE_preview_image.hh"
 
#include "IMB_imbuf_types.hh"
#include "IMB_thumbs.hh"
 
#include "MEM_guardedalloc.h"
 
/* NOTE: we should handle all previews for a same group at once, would avoid reopening
 * `.blend` file for each and every ID. However, this adds some complexity,
 * so keep it for later. */
static ImBuf *imb_thumb_load_from_blend_id(const char *blen_path,
                                           const char *blen_group,
                                           const char *blen_id)
{
  ImBuf *ima = nullptr;
  BlendFileReadReport bf_reports = {};
  bf_reports.reports = nullptr;
 
  BlendHandle *libfiledata = BLO_blendhandle_from_file(blen_path, &bf_reports);
  if (libfiledata == nullptr) {
    return nullptr;
  }
 
  int idcode = BKE_idtype_idcode_from_name(blen_group);
  PreviewImage *preview = BLO_blendhandle_get_preview_for_id(libfiledata, idcode, blen_id);
  BLO_blendhandle_close(libfiledata);
 
  if (preview) {
    ima = BKE_previewimg_to_imbuf(preview, ICON_SIZE_PREVIEW);
    BKE_previewimg_freefunc(preview);
  }
  return ima;
}
 
static ImBuf *imb_thumb_load_from_blendfile(const char *blen_path)
{
  BlendThumbnail *data = BLO_thumbnail_from_file(blen_path);
  ImBuf *ima = BKE_main_thumbnail_to_imbuf(nullptr, data);
 
  if (data) {
    MEM_freeN(data);
  }
  return ima;
}
 
ImBuf *IMB_thumb_load_blend(const char *blen_path, const char *blen_group, const char *blen_id)
{
  if (blen_group && blen_id) {
    return imb_thumb_load_from_blend_id(blen_path, blen_group, blen_id);
  }
  return imb_thumb_load_from_blendfile(blen_path);
}