274 lines
7.6 KiB
C
274 lines
7.6 KiB
C
/****************************************************************************
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*
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* ftsnames.h
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*
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* Simple interface to access SFNT 'name' tables (which are used
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* to hold font names, copyright info, notices, etc.) (specification).
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*
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* This is _not_ used to retrieve glyph names!
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*
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* Copyright (C) 1996-2020 by
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* David Turner, Robert Wilhelm, and Werner Lemberg.
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*
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* This file is part of the FreeType project, and may only be used,
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* modified, and distributed under the terms of the FreeType project
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* license, LICENSE.TXT. By continuing to use, modify, or distribute
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* this file you indicate that you have read the license and
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* understand and accept it fully.
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*
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*/
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#ifndef FTSNAMES_H_
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#define FTSNAMES_H_
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#include <ft2build.h>
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#include FT_FREETYPE_H
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#include FT_PARAMETER_TAGS_H
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#ifdef FREETYPE_H
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#error "freetype.h of FreeType 1 has been loaded!"
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#error "Please fix the directory search order for header files"
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#error "so that freetype.h of FreeType 2 is found first."
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#endif
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FT_BEGIN_HEADER
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/**************************************************************************
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*
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* @section:
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* sfnt_names
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*
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* @title:
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* SFNT Names
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*
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* @abstract:
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* Access the names embedded in TrueType and OpenType files.
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*
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* @description:
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* The TrueType and OpenType specifications allow the inclusion of a
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* special names table ('name') in font files. This table contains
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* textual (and internationalized) information regarding the font, like
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* family name, copyright, version, etc.
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*
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* The definitions below are used to access them if available.
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*
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* Note that this has nothing to do with glyph names!
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*
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*/
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/**************************************************************************
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*
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* @struct:
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* FT_SfntName
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*
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* @description:
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* A structure used to model an SFNT 'name' table entry.
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*
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* @fields:
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* platform_id ::
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* The platform ID for `string`. See @TT_PLATFORM_XXX for possible
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* values.
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*
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* encoding_id ::
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* The encoding ID for `string`. See @TT_APPLE_ID_XXX, @TT_MAC_ID_XXX,
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* @TT_ISO_ID_XXX, @TT_MS_ID_XXX, and @TT_ADOBE_ID_XXX for possible
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* values.
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*
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* language_id ::
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* The language ID for `string`. See @TT_MAC_LANGID_XXX and
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* @TT_MS_LANGID_XXX for possible values.
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*
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* Registered OpenType values for `language_id` are always smaller than
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* 0x8000; values equal or larger than 0x8000 usually indicate a
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* language tag string (introduced in OpenType version 1.6). Use
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* function @FT_Get_Sfnt_LangTag with `language_id` as its argument to
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* retrieve the associated language tag.
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*
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* name_id ::
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* An identifier for `string`. See @TT_NAME_ID_XXX for possible
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* values.
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*
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* string ::
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* The 'name' string. Note that its format differs depending on the
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* (platform,encoding) pair, being either a string of bytes (without a
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* terminating `NULL` byte) or containing UTF-16BE entities.
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*
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* string_len ::
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* The length of `string` in bytes.
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*
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* @note:
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* Please refer to the TrueType or OpenType specification for more
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* details.
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*/
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typedef struct FT_SfntName_
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{
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FT_UShort platform_id;
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FT_UShort encoding_id;
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FT_UShort language_id;
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FT_UShort name_id;
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FT_Byte* string; /* this string is *not* null-terminated! */
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FT_UInt string_len; /* in bytes */
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} FT_SfntName;
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/**************************************************************************
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*
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* @function:
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* FT_Get_Sfnt_Name_Count
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*
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* @description:
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* Retrieve the number of name strings in the SFNT 'name' table.
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*
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* @input:
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* face ::
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* A handle to the source face.
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*
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* @return:
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* The number of strings in the 'name' table.
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*
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* @note:
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* This function always returns an error if the config macro
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* `TT_CONFIG_OPTION_SFNT_NAMES` is not defined in `ftoption.h`.
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*/
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FT_EXPORT( FT_UInt )
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FT_Get_Sfnt_Name_Count( FT_Face face );
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/**************************************************************************
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*
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* @function:
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* FT_Get_Sfnt_Name
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*
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* @description:
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* Retrieve a string of the SFNT 'name' table for a given index.
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*
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* @input:
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* face ::
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* A handle to the source face.
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*
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* idx ::
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* The index of the 'name' string.
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*
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* @output:
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* aname ::
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* The indexed @FT_SfntName structure.
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*
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* @return:
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* FreeType error code. 0~means success.
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*
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* @note:
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* The `string` array returned in the `aname` structure is not
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* null-terminated. Note that you don't have to deallocate `string` by
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* yourself; FreeType takes care of it if you call @FT_Done_Face.
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*
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* Use @FT_Get_Sfnt_Name_Count to get the total number of available
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* 'name' table entries, then do a loop until you get the right platform,
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* encoding, and name ID.
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*
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* 'name' table format~1 entries can use language tags also, see
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* @FT_Get_Sfnt_LangTag.
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*
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* This function always returns an error if the config macro
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* `TT_CONFIG_OPTION_SFNT_NAMES` is not defined in `ftoption.h`.
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*/
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FT_EXPORT( FT_Error )
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FT_Get_Sfnt_Name( FT_Face face,
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FT_UInt idx,
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FT_SfntName *aname );
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/**************************************************************************
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*
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* @struct:
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* FT_SfntLangTag
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*
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* @description:
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* A structure to model a language tag entry from an SFNT 'name' table.
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*
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* @fields:
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* string ::
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* The language tag string, encoded in UTF-16BE (without trailing
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* `NULL` bytes).
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*
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* string_len ::
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* The length of `string` in **bytes**.
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*
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* @note:
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* Please refer to the TrueType or OpenType specification for more
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* details.
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*
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* @since:
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* 2.8
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*/
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typedef struct FT_SfntLangTag_
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{
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FT_Byte* string; /* this string is *not* null-terminated! */
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FT_UInt string_len; /* in bytes */
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} FT_SfntLangTag;
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/**************************************************************************
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*
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* @function:
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* FT_Get_Sfnt_LangTag
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*
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* @description:
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* Retrieve the language tag associated with a language ID of an SFNT
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* 'name' table entry.
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*
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* @input:
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* face ::
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* A handle to the source face.
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*
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* langID ::
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* The language ID, as returned by @FT_Get_Sfnt_Name. This is always a
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* value larger than 0x8000.
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*
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* @output:
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* alangTag ::
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* The language tag associated with the 'name' table entry's language
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* ID.
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*
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* @return:
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* FreeType error code. 0~means success.
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*
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* @note:
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* The `string` array returned in the `alangTag` structure is not
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* null-terminated. Note that you don't have to deallocate `string` by
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* yourself; FreeType takes care of it if you call @FT_Done_Face.
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*
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* Only 'name' table format~1 supports language tags. For format~0
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* tables, this function always returns FT_Err_Invalid_Table. For
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* invalid format~1 language ID values, FT_Err_Invalid_Argument is
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* returned.
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*
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* This function always returns an error if the config macro
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* `TT_CONFIG_OPTION_SFNT_NAMES` is not defined in `ftoption.h`.
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*
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* @since:
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* 2.8
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*/
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FT_EXPORT( FT_Error )
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FT_Get_Sfnt_LangTag( FT_Face face,
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FT_UInt langID,
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FT_SfntLangTag *alangTag );
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/* */
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FT_END_HEADER
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#endif /* FTSNAMES_H_ */
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/* END */
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