| /**************************************************************************** |
| * |
| * ftgxval.h |
| * |
| * FreeType API for validating TrueTypeGX/AAT tables (specification). |
| * |
| * Copyright (C) 2004-2021 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 <freetype/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 */ |
