blender-archive/source/blender/blenloader/BLO_blend_defs.h

/*
 * 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.
 */
#pragma once

/** \file
 * \ingroup blenloader
 * \brief defines for blend-file codes.
 */

/* INTEGER CODES */
#ifdef __BIG_ENDIAN__
/* Big Endian */
#  define BLEND_MAKE_ID(a, b, c, d) ((int)(a) << 24 | (int)(b) << 16 | (c) << 8 | (d))
#else
/* Little Endian */
#  define BLEND_MAKE_ID(a, b, c, d) ((int)(d) << 24 | (int)(c) << 16 | (b) << 8 | (a))
#endif

/**
 * Codes used for #BHead.code.
 *
 * These coexist with ID codes such as #ID_OB, #ID_SCE ... etc.
 */
enum {
  /**
   * Arbitrary allocated memory
   * (typically owned by #ID's, will be freed when there are no users).
   */
  DATA = BLEND_MAKE_ID('D', 'A', 'T', 'A'),
  /**
   * Used for #Global struct.
   */
  GLOB = BLEND_MAKE_ID('G', 'L', 'O', 'B'),
  /**
   * Used for storing the encoded SDNA string
   * (decoded into an #SDNA on load).
   */
  DNA1 = BLEND_MAKE_ID('D', 'N', 'A', '1'),
  /**
   * Used to store thumbnail previews, written between #REND and #GLOB blocks,
   * (ignored for regular file reading).
   */
  TEST = BLEND_MAKE_ID('T', 'E', 'S', 'T'),
  /**
   * Used for #RenderInfo, basic Scene and frame range info,
   * can be easily read by other applications without writing a full blend file parser.
   */
  REND = BLEND_MAKE_ID('R', 'E', 'N', 'D'),
  /**
   * Used for #UserDef, (user-preferences data).
   * (written to #BLENDER_STARTUP_FILE & #BLENDER_USERPREF_FILE).
   */
  USER = BLEND_MAKE_ID('U', 'S', 'E', 'R'),
  /**
   * Terminate reading (no data).
   */
  ENDB = BLEND_MAKE_ID('E', 'N', 'D', 'B'),
};

#define BLEN_THUMB_MEMSIZE_FILE(_x, _y) (sizeof(int) * (2 + (size_t)(_x) * (size_t)(_y)))