freetype2/include/freetype/ftsnames.h

/****************************************************************************
 *
 * ftsnames.h
 *
 *   Simple interface to access SFNT `name` tables (which are used
 *   to hold font names, copyright info, notices, etc.) (specification).
 *
 *   This is _not_ used to retrieve glyph names!
 *
 * Copyright 1996-2019 by
 * David Turner, Robert Wilhelm, and Werner Lemberg.
 *
 * This file is part of the FreeType project, and may only be used,
 * modified, and distributed under the terms of the FreeType project
 * license, LICENSE.TXT.  By continuing to use, modify, or distribute
 * this file you indicate that you have read the license and
 * understand and accept it fully.
 *
 */


#ifndef FTSNAMES_H_
#define FTSNAMES_H_


#include <ft2build.h>
#include FT_FREETYPE_H
#include FT_PARAMETER_TAGS_H

#ifdef FREETYPE_H
#error "freetype.h of FreeType 1 has been loaded!"
#error "Please fix the directory search order for header files"
#error "so that freetype.h of FreeType 2 is found first."
#endif


FT_BEGIN_HEADER


  /**************************************************************************
   *
   * @section:
   *   sfnt_names
   *
   * @title:
   *   SFNT Names
   *
   * @abstract:
   *   Access the names embedded in TrueType and OpenType files.
   *
   * @description:
   *   The TrueType and OpenType specifications allow the inclusion of a
   *   special names table (`name`) in font files.  This table contains
   *   textual (and internationalized) information regarding the font, like
   *   family name, copyright, version, etc.
   *
   *   The definitions below are used to access them if available.
   *
   *   Note that this has nothing to do with glyph names!
   *
   */


  /**************************************************************************
   *
   * @struct:
   *   FT_SfntName
   *
   * @description:
   *   A structure used to model an SFNT `name` table entry.
   *
   * @fields:
   *   platform_id ::
   *     The platform ID for `string`.  See @TT_PLATFORM_XXX for possible
   *     values.
   *
   *   encoding_id ::
   *     The encoding ID for `string`.  See @TT_APPLE_ID_XXX, @TT_MAC_ID_XXX,
   *     @TT_ISO_ID_XXX, @TT_MS_ID_XXX, and @TT_ADOBE_ID_XXX for possible
   *     values.
   *
   *   language_id ::
   *     The language ID for `string`.  See @TT_MAC_LANGID_XXX and
   *     @TT_MS_LANGID_XXX for possible values.
   *
   *     Registered OpenType values for `language_id` are always smaller than
   *     0x8000; values equal or larger than 0x8000 usually indicate a
   *     language tag string (introduced in OpenType version 1.6).  Use
   *     function @FT_Get_Sfnt_LangTag with `language_id` as its argument to
   *     retrieve the associated language tag.
   *
   *   name_id ::
   *     An identifier for `string`.  See @TT_NAME_ID_XXX for possible
   *     values.
   *
   *   string ::
   *     The 'name' string.  Note that its format differs depending on the
   *     (platform,encoding) pair, being either a string of bytes (without a
   *     terminating `NULL` byte) or containing UTF-16BE entities.
   *
   *   string_len ::
   *     The length of `string` in bytes.
   *
   * @note:
   *   Please refer to the TrueType or OpenType specification for more
   *   details.
   */
  typedef struct  FT_SfntName_
  {
    FT_UShort  platform_id;
    FT_UShort  encoding_id;
    FT_UShort  language_id;
    FT_UShort  name_id;

    FT_Byte*   string;      /* this string is *not* null-terminated! */
    FT_UInt    string_len;  /* in bytes                              */

  } FT_SfntName;


  /**************************************************************************
   *
   * @function:
   *   FT_Get_Sfnt_Name_Count
   *
   * @description:
   *   Retrieve the number of name strings in the SFNT `name` table.
   *
   * @input:
   *   face ::
   *     A handle to the source face.
   *
   * @return:
   *   The number of strings in the `name` table.
   *
   * @note:
   *   This function always returns an error if the config macro
   *   `TT_CONFIG_OPTION_SFNT_NAMES` is not defined in `ftoption.h`.
   */
  FT_EXPORT( FT_UInt )
  FT_Get_Sfnt_Name_Count( FT_Face  face );


  /**************************************************************************
   *
   * @function:
   *   FT_Get_Sfnt_Name
   *
   * @description:
   *   Retrieve a string of the SFNT `name` table for a given index.
   *
   * @input:
   *   face ::
   *     A handle to the source face.
   *
   *   idx ::
   *     The index of the 'name' string.
   *
   * @output:
   *   aname ::
   *     The indexed @FT_SfntName structure.
   *
   * @return:
   *   FreeType error code.  0~means success.
   *
   * @note:
   *   The `string` array returned in the `aname` structure is not
   *   null-terminated.  Note that you don't have to deallocate `string` by
   *   yourself; FreeType takes care of it if you call @FT_Done_Face.
   *
   *   Use @FT_Get_Sfnt_Name_Count to get the total number of available
   *   `name` table entries, then do a loop until you get the right platform,
   *   encoding, and name ID.
   *
   *   `name` table format~1 entries can use language tags also, see
   *   @FT_Get_Sfnt_LangTag.
   *
   *   This function always returns an error if the config macro
   *   `TT_CONFIG_OPTION_SFNT_NAMES` is not defined in `ftoption.h`.
   */
  FT_EXPORT( FT_Error )
  FT_Get_Sfnt_Name( FT_Face       face,
                    FT_UInt       idx,
                    FT_SfntName  *aname );


  /**************************************************************************
   *
   * @struct:
   *   FT_SfntLangTag
   *
   * @description:
   *   A structure to model a language tag entry from an SFNT `name` table.
   *
   * @fields:
   *   string ::
   *     The language tag string, encoded in UTF-16BE (without trailing
   *     `NULL` bytes).
   *
   *   string_len ::
   *     The length of `string` in **bytes**.
   *
   * @note:
   *   Please refer to the TrueType or OpenType specification for more
   *   details.
   *
   * @since:
   *   2.8
   */
  typedef struct  FT_SfntLangTag_
  {
    FT_Byte*  string;      /* this string is *not* null-terminated! */
    FT_UInt   string_len;  /* in bytes                              */

  } FT_SfntLangTag;


  /**************************************************************************
   *
   * @function:
   *   FT_Get_Sfnt_LangTag
   *
   * @description:
   *   Retrieve the language tag associated with a language ID of an SFNT
   *   `name` table entry.
   *
   * @input:
   *   face ::
   *     A handle to the source face.
   *
   *   langID ::
   *     The language ID, as returned by @FT_Get_Sfnt_Name.  This is always a
   *     value larger than 0x8000.
   *
   * @output:
   *   alangTag ::
   *     The language tag associated with the `name` table entry's language
   *     ID.
   *
   * @return:
   *   FreeType error code.  0~means success.
   *
   * @note:
   *   The `string` array returned in the `alangTag` structure is not
   *   null-terminated.  Note that you don't have to deallocate `string` by
   *   yourself; FreeType takes care of it if you call @FT_Done_Face.
   *
   *   Only `name` table format~1 supports language tags.  For format~0
   *   tables, this function always returns FT_Err_Invalid_Table.  For
   *   invalid format~1 language ID values, FT_Err_Invalid_Argument is
   *   returned.
   *
   *   This function always returns an error if the config macro
   *   `TT_CONFIG_OPTION_SFNT_NAMES` is not defined in `ftoption.h`.
   *
   * @since:
   *   2.8
   */
  FT_EXPORT( FT_Error )
  FT_Get_Sfnt_LangTag( FT_Face          face,
                       FT_UInt          langID,
                       FT_SfntLangTag  *alangTag );


  /* */


FT_END_HEADER

#endif /* FTSNAMES_H_ */


/* END */