356 lines
10 KiB
C
356 lines
10 KiB
C
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/****************************************************************************
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*
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* ftgxval.h
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*
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* FreeType API for validating TrueTypeGX/AAT tables (specification).
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*
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* Copyright (C) 2004-2020 by
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* Masatake YAMATO, Redhat K.K,
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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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/****************************************************************************
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*
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* gxvalid is derived from both gxlayout module and otvalid module.
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* Development of gxlayout is supported by the Information-technology
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* Promotion Agency(IPA), Japan.
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*
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*/
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#ifndef FTGXVAL_H_
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#define FTGXVAL_H_
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#include <ft2build.h>
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#include FT_FREETYPE_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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* gx_validation
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*
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* @title:
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* TrueTypeGX/AAT Validation
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*
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* @abstract:
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* An API to validate TrueTypeGX/AAT tables.
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*
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* @description:
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* This section contains the declaration of functions to validate some
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* TrueTypeGX tables (feat, mort, morx, bsln, just, kern, opbd, trak,
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* prop, lcar).
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*
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* @order:
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* FT_TrueTypeGX_Validate
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* FT_TrueTypeGX_Free
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*
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* FT_ClassicKern_Validate
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* FT_ClassicKern_Free
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*
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* FT_VALIDATE_GX_LENGTH
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* FT_VALIDATE_GXXXX
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* FT_VALIDATE_CKERNXXX
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*
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*/
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/**************************************************************************
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*
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*
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* Warning: Use `FT_VALIDATE_XXX` to validate a table.
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* Following definitions are for gxvalid developers.
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*
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*
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*/
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#define FT_VALIDATE_feat_INDEX 0
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#define FT_VALIDATE_mort_INDEX 1
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#define FT_VALIDATE_morx_INDEX 2
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#define FT_VALIDATE_bsln_INDEX 3
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#define FT_VALIDATE_just_INDEX 4
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#define FT_VALIDATE_kern_INDEX 5
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#define FT_VALIDATE_opbd_INDEX 6
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#define FT_VALIDATE_trak_INDEX 7
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#define FT_VALIDATE_prop_INDEX 8
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#define FT_VALIDATE_lcar_INDEX 9
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#define FT_VALIDATE_GX_LAST_INDEX FT_VALIDATE_lcar_INDEX
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/**************************************************************************
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*
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* @macro:
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* FT_VALIDATE_GX_LENGTH
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*
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* @description:
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* The number of tables checked in this module. Use it as a parameter
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* for the `table-length` argument of function @FT_TrueTypeGX_Validate.
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*/
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#define FT_VALIDATE_GX_LENGTH ( FT_VALIDATE_GX_LAST_INDEX + 1 )
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/* */
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/* Up to 0x1000 is used by otvalid.
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Ox2xxx is reserved for feature OT extension. */
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#define FT_VALIDATE_GX_START 0x4000
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#define FT_VALIDATE_GX_BITFIELD( tag ) \
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( FT_VALIDATE_GX_START << FT_VALIDATE_##tag##_INDEX )
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/**************************************************************************
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*
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* @enum:
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* FT_VALIDATE_GXXXX
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*
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* @description:
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* A list of bit-field constants used with @FT_TrueTypeGX_Validate to
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* indicate which TrueTypeGX/AAT Type tables should be validated.
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*
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* @values:
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* FT_VALIDATE_feat ::
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* Validate 'feat' table.
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*
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* FT_VALIDATE_mort ::
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* Validate 'mort' table.
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*
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* FT_VALIDATE_morx ::
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* Validate 'morx' table.
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*
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* FT_VALIDATE_bsln ::
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* Validate 'bsln' table.
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*
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* FT_VALIDATE_just ::
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* Validate 'just' table.
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*
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* FT_VALIDATE_kern ::
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* Validate 'kern' table.
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*
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* FT_VALIDATE_opbd ::
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* Validate 'opbd' table.
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*
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* FT_VALIDATE_trak ::
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* Validate 'trak' table.
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*
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* FT_VALIDATE_prop ::
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* Validate 'prop' table.
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*
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* FT_VALIDATE_lcar ::
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* Validate 'lcar' table.
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*
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* FT_VALIDATE_GX ::
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* Validate all TrueTypeGX tables (feat, mort, morx, bsln, just, kern,
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* opbd, trak, prop and lcar).
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*
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*/
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#define FT_VALIDATE_feat FT_VALIDATE_GX_BITFIELD( feat )
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#define FT_VALIDATE_mort FT_VALIDATE_GX_BITFIELD( mort )
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#define FT_VALIDATE_morx FT_VALIDATE_GX_BITFIELD( morx )
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#define FT_VALIDATE_bsln FT_VALIDATE_GX_BITFIELD( bsln )
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#define FT_VALIDATE_just FT_VALIDATE_GX_BITFIELD( just )
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#define FT_VALIDATE_kern FT_VALIDATE_GX_BITFIELD( kern )
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#define FT_VALIDATE_opbd FT_VALIDATE_GX_BITFIELD( opbd )
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#define FT_VALIDATE_trak FT_VALIDATE_GX_BITFIELD( trak )
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#define FT_VALIDATE_prop FT_VALIDATE_GX_BITFIELD( prop )
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#define FT_VALIDATE_lcar FT_VALIDATE_GX_BITFIELD( lcar )
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#define FT_VALIDATE_GX ( FT_VALIDATE_feat | \
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FT_VALIDATE_mort | \
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FT_VALIDATE_morx | \
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FT_VALIDATE_bsln | \
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FT_VALIDATE_just | \
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FT_VALIDATE_kern | \
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FT_VALIDATE_opbd | \
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FT_VALIDATE_trak | \
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FT_VALIDATE_prop | \
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FT_VALIDATE_lcar )
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/**************************************************************************
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*
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* @function:
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* FT_TrueTypeGX_Validate
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*
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* @description:
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* Validate various TrueTypeGX tables to assure that all offsets and
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* indices are valid. The idea is that a higher-level library that
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* actually does the text layout can access those tables without error
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* checking (which can be quite time consuming).
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*
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* @input:
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* face ::
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* A handle to the input face.
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*
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* validation_flags ::
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* A bit field that specifies the tables to be validated. See
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* @FT_VALIDATE_GXXXX for possible values.
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*
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* table_length ::
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* The size of the `tables` array. Normally, @FT_VALIDATE_GX_LENGTH
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* should be passed.
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*
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* @output:
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* tables ::
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* The array where all validated sfnt tables are stored. The array
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* itself must be allocated by a client.
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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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* This function only works with TrueTypeGX fonts, returning an error
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* otherwise.
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*
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* After use, the application should deallocate the buffers pointed to by
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* each `tables` element, by calling @FT_TrueTypeGX_Free. A `NULL` value
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* indicates that the table either doesn't exist in the font, the
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* application hasn't asked for validation, or the validator doesn't have
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* the ability to validate the sfnt table.
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*/
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FT_EXPORT( FT_Error )
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FT_TrueTypeGX_Validate( FT_Face face,
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FT_UInt validation_flags,
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FT_Bytes tables[FT_VALIDATE_GX_LENGTH],
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FT_UInt table_length );
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/**************************************************************************
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*
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* @function:
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* FT_TrueTypeGX_Free
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*
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* @description:
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* Free the buffer allocated by TrueTypeGX validator.
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*
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* @input:
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* face ::
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* A handle to the input face.
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*
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* table ::
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* The pointer to the buffer allocated by @FT_TrueTypeGX_Validate.
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*
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* @note:
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* This function must be used to free the buffer allocated by
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* @FT_TrueTypeGX_Validate only.
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*/
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FT_EXPORT( void )
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FT_TrueTypeGX_Free( FT_Face face,
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FT_Bytes table );
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/**************************************************************************
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*
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* @enum:
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* FT_VALIDATE_CKERNXXX
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*
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* @description:
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* A list of bit-field constants used with @FT_ClassicKern_Validate to
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* indicate the classic kern dialect or dialects. If the selected type
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* doesn't fit, @FT_ClassicKern_Validate regards the table as invalid.
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*
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* @values:
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* FT_VALIDATE_MS ::
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* Handle the 'kern' table as a classic Microsoft kern table.
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*
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* FT_VALIDATE_APPLE ::
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* Handle the 'kern' table as a classic Apple kern table.
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*
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* FT_VALIDATE_CKERN ::
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* Handle the 'kern' as either classic Apple or Microsoft kern table.
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*/
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#define FT_VALIDATE_MS ( FT_VALIDATE_GX_START << 0 )
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#define FT_VALIDATE_APPLE ( FT_VALIDATE_GX_START << 1 )
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#define FT_VALIDATE_CKERN ( FT_VALIDATE_MS | FT_VALIDATE_APPLE )
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/**************************************************************************
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*
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* @function:
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* FT_ClassicKern_Validate
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*
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* @description:
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* Validate classic (16-bit format) kern table to assure that the
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* offsets and indices are valid. The idea is that a higher-level
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* library that actually does the text layout can access those tables
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* without error checking (which can be quite time consuming).
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*
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* The 'kern' table validator in @FT_TrueTypeGX_Validate deals with both
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* the new 32-bit format and the classic 16-bit format, while
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* FT_ClassicKern_Validate only supports the classic 16-bit format.
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*
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* @input:
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* face ::
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* A handle to the input face.
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*
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* validation_flags ::
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* A bit field that specifies the dialect to be validated. See
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* @FT_VALIDATE_CKERNXXX for possible values.
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*
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* @output:
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* ckern_table ::
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* A pointer to the kern table.
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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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* After use, the application should deallocate the buffers pointed to by
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* `ckern_table`, by calling @FT_ClassicKern_Free. A `NULL` value
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* indicates that the table doesn't exist in the font.
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*/
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FT_EXPORT( FT_Error )
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FT_ClassicKern_Validate( FT_Face face,
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FT_UInt validation_flags,
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FT_Bytes *ckern_table );
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/**************************************************************************
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*
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* @function:
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* FT_ClassicKern_Free
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*
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* @description:
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* Free the buffer allocated by classic Kern validator.
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*
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* @input:
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* face ::
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* A handle to the input face.
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*
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* table ::
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* The pointer to the buffer that is allocated by
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* @FT_ClassicKern_Validate.
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*
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* @note:
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* This function must be used to free the buffer allocated by
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* @FT_ClassicKern_Validate only.
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*/
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FT_EXPORT( void )
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FT_ClassicKern_Free( FT_Face face,
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FT_Bytes table );
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/* */
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FT_END_HEADER
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#endif /* FTGXVAL_H_ */
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/* END */
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