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/***************************************************************************/
/* */
/* ftgxval.h */
/* */
/* FreeType API for validating TrueTypeGX/AAT tables (specification). */
/* */
/* Copyright 2004-2017 by */
/* Masatake YAMATO, Redhat K.K, */
/* 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. */
/* */
/***************************************************************************/
/***************************************************************************/
/* */
/* gxvalid is derived from both gxlayout module and otvalid module. */
/* Development of gxlayout is supported by the Information-technology */
/* Promotion Agency(IPA), Japan. */
/* */
/***************************************************************************/
#ifndef FTGXVAL_H_
#define FTGXVAL_H_
#include <ft2build.h>
#include FT_FREETYPE_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> */
/* gx_validation */
/* */
/* <Title> */
/* TrueTypeGX/AAT Validation */
/* */
/* <Abstract> */
/* An API to validate TrueTypeGX/AAT tables. */
/* */
/* <Description> */
/* This section contains the declaration of functions to validate */
/* some TrueTypeGX tables (feat, mort, morx, bsln, just, kern, opbd, */
/* trak, prop, lcar). */
/* */
/* <Order> */
/* FT_TrueTypeGX_Validate */
/* FT_TrueTypeGX_Free */
/* */
/* FT_ClassicKern_Validate */
/* FT_ClassicKern_Free */
/* */
/* FT_VALIDATE_GX_LENGTH */
/* FT_VALIDATE_GXXXX */
/* FT_VALIDATE_CKERNXXX */
/* */
/*************************************************************************/
/*************************************************************************/
/* */
/* */
/* Warning: Use FT_VALIDATE_XXX to validate a table. */
/* Following definitions are for gxvalid developers. */
/* */
/* */
/*************************************************************************/
#define FT_VALIDATE_feat_INDEX 0
#define FT_VALIDATE_mort_INDEX 1
#define FT_VALIDATE_morx_INDEX 2
#define FT_VALIDATE_bsln_INDEX 3
#define FT_VALIDATE_just_INDEX 4
#define FT_VALIDATE_kern_INDEX 5
#define FT_VALIDATE_opbd_INDEX 6
#define FT_VALIDATE_trak_INDEX 7
#define FT_VALIDATE_prop_INDEX 8
#define FT_VALIDATE_lcar_INDEX 9
#define FT_VALIDATE_GX_LAST_INDEX FT_VALIDATE_lcar_INDEX
/*************************************************************************
*
* @macro:
* FT_VALIDATE_GX_LENGTH
*
* @description:
* The number of tables checked in this module. Use it as a parameter
* for the `table-length' argument of function @FT_TrueTypeGX_Validate.
*/
#define FT_VALIDATE_GX_LENGTH (FT_VALIDATE_GX_LAST_INDEX + 1)
/* */
/* Up to 0x1000 is used by otvalid.
Ox2xxx is reserved for feature OT extension. */
#define FT_VALIDATE_GX_START 0x4000
#define FT_VALIDATE_GX_BITFIELD( tag ) \
( FT_VALIDATE_GX_START << FT_VALIDATE_##tag##_INDEX )
/**********************************************************************
*
* @enum:
* FT_VALIDATE_GXXXX
*
* @description:
* A list of bit-field constants used with @FT_TrueTypeGX_Validate to
* indicate which TrueTypeGX/AAT Type tables should be validated.
*
* @values:
* FT_VALIDATE_feat ::
* Validate `feat' table.
*
* FT_VALIDATE_mort ::
* Validate `mort' table.
*
* FT_VALIDATE_morx ::
* Validate `morx' table.
*
* FT_VALIDATE_bsln ::
* Validate `bsln' table.
*
* FT_VALIDATE_just ::
* Validate `just' table.
*
* FT_VALIDATE_kern ::
* Validate `kern' table.
*
* FT_VALIDATE_opbd ::
* Validate `opbd' table.
*
* FT_VALIDATE_trak ::
* Validate `trak' table.
*
* FT_VALIDATE_prop ::
* Validate `prop' table.
*
* FT_VALIDATE_lcar ::
* Validate `lcar' table.
*
* FT_VALIDATE_GX ::
* Validate all TrueTypeGX tables (feat, mort, morx, bsln, just, kern,
* opbd, trak, prop and lcar).
*
*/
#define FT_VALIDATE_feat FT_VALIDATE_GX_BITFIELD( feat )
#define FT_VALIDATE_mort FT_VALIDATE_GX_BITFIELD( mort )
#define FT_VALIDATE_morx FT_VALIDATE_GX_BITFIELD( morx )
#define FT_VALIDATE_bsln FT_VALIDATE_GX_BITFIELD( bsln )
#define FT_VALIDATE_just FT_VALIDATE_GX_BITFIELD( just )
#define FT_VALIDATE_kern FT_VALIDATE_GX_BITFIELD( kern )
#define FT_VALIDATE_opbd FT_VALIDATE_GX_BITFIELD( opbd )
#define FT_VALIDATE_trak FT_VALIDATE_GX_BITFIELD( trak )
#define FT_VALIDATE_prop FT_VALIDATE_GX_BITFIELD( prop )
#define FT_VALIDATE_lcar FT_VALIDATE_GX_BITFIELD( lcar )
#define FT_VALIDATE_GX ( FT_VALIDATE_feat | \
FT_VALIDATE_mort | \
FT_VALIDATE_morx | \
FT_VALIDATE_bsln | \
FT_VALIDATE_just | \
FT_VALIDATE_kern | \
FT_VALIDATE_opbd | \
FT_VALIDATE_trak | \
FT_VALIDATE_prop | \
FT_VALIDATE_lcar )
/**********************************************************************
*
* @function:
* FT_TrueTypeGX_Validate
*
* @description:
* Validate various TrueTypeGX tables to assure that all offsets and
* indices are valid. The idea is that a higher-level library that
* actually does the text layout can access those tables without
* error checking (which can be quite time consuming).
*
* @input:
* face ::
* A handle to the input face.
*
* validation_flags ::
* A bit field that specifies the tables to be validated. See
* @FT_VALIDATE_GXXXX for possible values.
*
* table_length ::
* The size of the `tables' array. Normally, @FT_VALIDATE_GX_LENGTH
* should be passed.
*
* @output:
* tables ::
* The array where all validated sfnt tables are stored.
* The array itself must be allocated by a client.
*
* @return:
* FreeType error code. 0~means success.
*
* @note:
* This function only works with TrueTypeGX fonts, returning an error
* otherwise.
*
* After use, the application should deallocate the buffers pointed to by
* each `tables' element, by calling @FT_TrueTypeGX_Free. A NULL value
* indicates that the table either doesn't exist in the font, the
* application hasn't asked for validation, or the validator doesn't have
* the ability to validate the sfnt table.
*/
FT_EXPORT( FT_Error )
FT_TrueTypeGX_Validate( FT_Face face,
FT_UInt validation_flags,
FT_Bytes tables[FT_VALIDATE_GX_LENGTH],
FT_UInt table_length );
/**********************************************************************
*
* @function:
* FT_TrueTypeGX_Free
*
* @description:
* Free the buffer allocated by TrueTypeGX validator.
*
* @input:
* face ::
* A handle to the input face.
*
* table ::
* The pointer to the buffer allocated by
* @FT_TrueTypeGX_Validate.
*
* @note:
* This function must be used to free the buffer allocated by
* @FT_TrueTypeGX_Validate only.
*/
FT_EXPORT( void )
FT_TrueTypeGX_Free( FT_Face face,
FT_Bytes table );
/**********************************************************************
*
* @enum:
* FT_VALIDATE_CKERNXXX
*
* @description:
* A list of bit-field constants used with @FT_ClassicKern_Validate
* to indicate the classic kern dialect or dialects. If the selected
* type doesn't fit, @FT_ClassicKern_Validate regards the table as
* invalid.
*
* @values:
* FT_VALIDATE_MS ::
* Handle the `kern' table as a classic Microsoft kern table.
*
* FT_VALIDATE_APPLE ::
* Handle the `kern' table as a classic Apple kern table.
*
* FT_VALIDATE_CKERN ::
* Handle the `kern' as either classic Apple or Microsoft kern table.
*/
#define FT_VALIDATE_MS ( FT_VALIDATE_GX_START << 0 )
#define FT_VALIDATE_APPLE ( FT_VALIDATE_GX_START << 1 )
#define FT_VALIDATE_CKERN ( FT_VALIDATE_MS | FT_VALIDATE_APPLE )
/**********************************************************************
*
* @function:
* FT_ClassicKern_Validate
*
* @description:
* Validate classic (16-bit format) kern table to assure that the offsets
* and indices are valid. The idea is that a higher-level library that
* actually does the text layout can access those tables without error
* checking (which can be quite time consuming).
*
* The `kern' table validator in @FT_TrueTypeGX_Validate deals with both
* the new 32-bit format and the classic 16-bit format, while
* FT_ClassicKern_Validate only supports the classic 16-bit format.
*
* @input:
* face ::
* A handle to the input face.
*
* validation_flags ::
* A bit field that specifies the dialect to be validated. See
* @FT_VALIDATE_CKERNXXX for possible values.
*
* @output:
* ckern_table ::
* A pointer to the kern table.
*
* @return:
* FreeType error code. 0~means success.
*
* @note:
* After use, the application should deallocate the buffers pointed to by
* `ckern_table', by calling @FT_ClassicKern_Free. A NULL value
* indicates that the table doesn't exist in the font.
*/
FT_EXPORT( FT_Error )
FT_ClassicKern_Validate( FT_Face face,
FT_UInt validation_flags,
FT_Bytes *ckern_table );
/**********************************************************************
*
* @function:
* FT_ClassicKern_Free
*
* @description:
* Free the buffer allocated by classic Kern validator.
*
* @input:
* face ::
* A handle to the input face.
*
* table ::
* The pointer to the buffer that is allocated by
* @FT_ClassicKern_Validate.
*
* @note:
* This function must be used to free the buffer allocated by
* @FT_ClassicKern_Validate only.
*/
FT_EXPORT( void )
FT_ClassicKern_Free( FT_Face face,
FT_Bytes table );
/* */
FT_END_HEADER
#endif /* FTGXVAL_H_ */
/* END */