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Edit File : ftotval.h \| Size : 7.41 KB
/**************************************************************************/ / / / ftotval.h / / / / FreeType API for validating OpenType tables (specification). / / / / Copyright 2004-2018 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. / / / /************************************************************************/ /************************************************************************/ / / / / / Warning: This module might be moved to a different library in the / / future to avoid a tight dependency between FreeType and the / / OpenType specification. / / / / / /************************************************************************/ #ifndef FTOTVAL_H_ #define FTOTVAL_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> / / ot_validation / / / / <Title> / / OpenType Validation / / / / <Abstract> / / An API to validate OpenType tables. / / / / <Description> / / This section contains the declaration of functions to validate / / some OpenType tables (BASE, GDEF, GPOS, GSUB, JSTF, MATH). / / / / <Order> / / FT_OpenType_Validate / / FT_OpenType_Free / / / / FT_VALIDATE_OTXXX / / / /**********************************************************************/ /******************************************************************** * * @enum: * FT_VALIDATE_OTXXX * * @description: * A list of bit-field constants used with @FT_OpenType_Validate to * indicate which OpenType tables should be validated. * * @values: * FT_VALIDATE_BASE :: * Validate BASE table. * * FT_VALIDATE_GDEF :: * Validate GDEF table. * * FT_VALIDATE_GPOS :: * Validate GPOS table. * * FT_VALIDATE_GSUB :: * Validate GSUB table. * * FT_VALIDATE_JSTF :: * Validate JSTF table. * * FT_VALIDATE_MATH :: * Validate MATH table. * * FT_VALIDATE_OT :: * Validate all OpenType tables (BASE, GDEF, GPOS, GSUB, JSTF, MATH). * / #define FT_VALIDATE_BASE 0x0100 #define FT_VALIDATE_GDEF 0x0200 #define FT_VALIDATE_GPOS 0x0400 #define FT_VALIDATE_GSUB 0x0800 #define FT_VALIDATE_JSTF 0x1000 #define FT_VALIDATE_MATH 0x2000 #define FT_VALIDATE_OT ( FT_VALIDATE_BASE \| \ FT_VALIDATE_GDEF \| \ FT_VALIDATE_GPOS \| \ FT_VALIDATE_GSUB \| \ FT_VALIDATE_JSTF \| \ FT_VALIDATE_MATH ) /********************************************************************* * * @function: * FT_OpenType_Validate * * @description: * Validate various OpenType 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_OTXXX for possible values. * * @output: * BASE_table :: * A pointer to the BASE table. * * GDEF_table :: * A pointer to the GDEF table. * * GPOS_table :: * A pointer to the GPOS table. * * GSUB_table :: * A pointer to the GSUB table. * * JSTF_table :: * A pointer to the JSTF table. * * @return: * FreeType error code. 0~means success. * * @note: * This function only works with OpenType fonts, returning an error * otherwise. * * After use, the application should deallocate the five tables with * @FT_OpenType_Free. A NULL value indicates that the table either * doesn't exist in the font, or the application hasn't asked for * validation. / FT_EXPORT( FT_Error ) FT_OpenType_Validate( FT_Face face, FT_UInt validation_flags, FT_Bytes BASE_table, FT_Bytes GDEF_table, FT_Bytes GPOS_table, FT_Bytes GSUB_table, FT_Bytes JSTF_table ); /********************************************************************** * * @function: * FT_OpenType_Free * * @description: * Free the buffer allocated by OpenType validator. * * @input: * face :: * A handle to the input face. * * table :: * The pointer to the buffer that is allocated by * @FT_OpenType_Validate. * * @note: * This function must be used to free the buffer allocated by * @FT_OpenType_Validate only. / FT_EXPORT( void ) FT_OpenType_Free( FT_Face face, FT_Bytes table ); / / FT_END_HEADER #endif / FTOTVAL_H_ / / END */ Back

Edit File : ftotval.h | Size : 7.41 KB

/***************************************************************************/
/*                                                                         */
/*  ftotval.h                                                              */
/*                                                                         */
/*    FreeType API for validating OpenType tables (specification).         */
/*                                                                         */
/*  Copyright 2004-2018 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.                                        */
/*                                                                         */
/***************************************************************************/

/***************************************************************************/
/*                                                                         */
/*                                                                         */
/* Warning: This module might be moved to a different library in the       */
/*          future to avoid a tight dependency between FreeType and the    */
/*          OpenType specification.                                        */
/*                                                                         */
/*                                                                         */
/***************************************************************************/

#ifndef FTOTVAL_H_
#define FTOTVAL_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>                                                             */
  /*    ot_validation                                                      */
  /*                                                                       */
  /* <Title>                                                               */
  /*    OpenType Validation                                                */
  /*                                                                       */
  /* <Abstract>                                                            */
  /*    An API to validate OpenType tables.                                */
  /*                                                                       */
  /* <Description>                                                         */
  /*    This section contains the declaration of functions to validate     */
  /*    some OpenType tables (BASE, GDEF, GPOS, GSUB, JSTF, MATH).         */
  /*                                                                       */
  /* <Order>                                                               */
  /*    FT_OpenType_Validate                                               */
  /*    FT_OpenType_Free                                                   */
  /*                                                                       */
  /*    FT_VALIDATE_OTXXX                                                  */
  /*                                                                       */
  /*************************************************************************/

/**********************************************************************
  *
  * @enum:
  *    FT_VALIDATE_OTXXX
  *
  * @description:
  *    A list of bit-field constants used with @FT_OpenType_Validate to
  *    indicate which OpenType tables should be validated.
  *
  * @values:
  *    FT_VALIDATE_BASE ::
  *      Validate BASE table.
  *
  *    FT_VALIDATE_GDEF ::
  *      Validate GDEF table.
  *
  *    FT_VALIDATE_GPOS ::
  *      Validate GPOS table.
  *
  *    FT_VALIDATE_GSUB ::
  *      Validate GSUB table.
  *
  *    FT_VALIDATE_JSTF ::
  *      Validate JSTF table.
  *
  *    FT_VALIDATE_MATH ::
  *      Validate MATH table.
  *
  *    FT_VALIDATE_OT ::
  *      Validate all OpenType tables (BASE, GDEF, GPOS, GSUB, JSTF, MATH).
  *
  */
#define FT_VALIDATE_BASE  0x0100
#define FT_VALIDATE_GDEF  0x0200
#define FT_VALIDATE_GPOS  0x0400
#define FT_VALIDATE_GSUB  0x0800
#define FT_VALIDATE_JSTF  0x1000
#define FT_VALIDATE_MATH  0x2000

#define FT_VALIDATE_OT  ( FT_VALIDATE_BASE | \
                          FT_VALIDATE_GDEF | \
                          FT_VALIDATE_GPOS | \
                          FT_VALIDATE_GSUB | \
                          FT_VALIDATE_JSTF | \
                          FT_VALIDATE_MATH )

/**********************************************************************
  *
  * @function:
  *    FT_OpenType_Validate
  *
  * @description:
  *    Validate various OpenType 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_OTXXX for possible values.
  *
  * @output:
  *    BASE_table ::
  *       A pointer to the BASE table.
  *
  *    GDEF_table ::
  *       A pointer to the GDEF table.
  *
  *    GPOS_table ::
  *       A pointer to the GPOS table.
  *
  *    GSUB_table ::
  *       A pointer to the GSUB table.
  *
  *    JSTF_table ::
  *       A pointer to the JSTF table.
  *
  * @return:
  *   FreeType error code.  0~means success.
  *
  * @note:
  *   This function only works with OpenType fonts, returning an error
  *   otherwise.
  *
  *   After use, the application should deallocate the five tables with
  *   @FT_OpenType_Free.  A NULL value indicates that the table either
  *   doesn't exist in the font, or the application hasn't asked for
  *   validation.
  */
  FT_EXPORT( FT_Error )
  FT_OpenType_Validate( FT_Face    face,
                        FT_UInt    validation_flags,
                        FT_Bytes  *BASE_table,
                        FT_Bytes  *GDEF_table,
                        FT_Bytes  *GPOS_table,
                        FT_Bytes  *GSUB_table,
                        FT_Bytes  *JSTF_table );

/**********************************************************************
  *
  * @function:
  *    FT_OpenType_Free
  *
  * @description:
  *    Free the buffer allocated by OpenType validator.
  *
  * @input:
  *    face ::
  *       A handle to the input face.
  *
  *    table ::
  *       The pointer to the buffer that is allocated by
  *       @FT_OpenType_Validate.
  *
  * @note:
  *   This function must be used to free the buffer allocated by
  *   @FT_OpenType_Validate only.
  */
  FT_EXPORT( void )
  FT_OpenType_Free( FT_Face   face,
                    FT_Bytes  table );

/* */

FT_END_HEADER

#endif /* FTOTVAL_H_ */

/* END */

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