freetype2/include/freetype/ftotval.h

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/***************************************************************************/
/* */
/* ftotval.h */
/* */
/* FreeType API for validating OpenType tables (specification). */
/* */
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/* Copyright 2004-2016 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 */
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/* some OpenType tables (BASE, GDEF, GPOS, GSUB, JSTF, MATH). */
/* */
/* <Order> */
/* FT_OpenType_Validate */
/* FT_OpenType_Free */
/* */
/* FT_VALIDATE_OTXXX */
/* */
/*************************************************************************/
/**********************************************************************
*
* @enum:
Add gxvalid module to validate TrueType GX/AAT tables. Modifications on existing files: * Jamfile: Register gxvalid module. * src/base/Jamfile: Register ftgxval.c. * src/base/rule.mk: Register ftgxval.c. * docs/INSTALL.ANY: Register gxvalid/gxvalid.c. * include/freetype/config/ftheader.h: Add macro to include gxvalid header file, FT_GX_VALIDATE_H. * include/freetype/config/ftmodule.h: Register gxv_module_class. * include/freetype/ftchapters.h: Add comment about gx_validation. * include/freetype/ftotval.h: Change keyword FT_VALIDATE_XXX to FT_VALIDATE_OTXXX to co-exist gxvalid. * include/freetype/tttags.h: Add tag for TrueType GX/AAT tables. * include/freetype/internal/ftserv.h: Add macro to use gxvalid service, FT_SERVICE_GX_VALIDATE_H * include/freetype/internal/fttrace.h: Add trace facilities for gxvalid. New files on existing directories: * include/freetype/internal/services/svgxval.h: Registration of validation service for TrueType GX/AAT and classic kern table. * include/freetype/ftgxval.h: Public API definition to use gxvalid. * src/base/ftgxval.c: Public API of gxvalid. New files under src/gxvalid/: * src/gxvalid/Jamfile src/gxvalid/README src/gxvalid/module.mk src/gxvalid/rules.mk src/gxvalid/gxvalid.c src/gxvalid/gxvalid.h src/gxvalid/gxvbsln.c src/gxvalid/gxvcommn.c src/gxvalid/gxvcommn.h src/gxvalid/gxverror.h src/gxvalid/gxvfeat.c src/gxvalid/gxvfgen.c src/gxvalid/gxvjust.c src/gxvalid/gxvkern.c src/gxvalid/gxvlcar.c src/gxvalid/gxvmod.c src/gxvalid/gxvmod.h src/gxvalid/gxvmort.c src/gxvalid/gxvmort.h src/gxvalid/gxvmort0.c src/gxvalid/gxvmort1.c src/gxvalid/gxvmort2.c src/gxvalid/gxvmort4.c src/gxvalid/gxvmort5.c src/gxvalid/gxvmorx.c src/gxvalid/gxvmorx.h src/gxvalid/gxvmorx0.c src/gxvalid/gxvmorx1.c src/gxvalid/gxvmorx2.c src/gxvalid/gxvmorx4.c src/gxvalid/gxvmorx5.c src/gxvalid/gxvopbd.c src/gxvalid/gxvprop.c src/gxvalid/gxvtrak.c: New files, gxvalid body.
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* 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
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#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
Add gxvalid module to validate TrueType GX/AAT tables. Modifications on existing files: * Jamfile: Register gxvalid module. * src/base/Jamfile: Register ftgxval.c. * src/base/rule.mk: Register ftgxval.c. * docs/INSTALL.ANY: Register gxvalid/gxvalid.c. * include/freetype/config/ftheader.h: Add macro to include gxvalid header file, FT_GX_VALIDATE_H. * include/freetype/config/ftmodule.h: Register gxv_module_class. * include/freetype/ftchapters.h: Add comment about gx_validation. * include/freetype/ftotval.h: Change keyword FT_VALIDATE_XXX to FT_VALIDATE_OTXXX to co-exist gxvalid. * include/freetype/tttags.h: Add tag for TrueType GX/AAT tables. * include/freetype/internal/ftserv.h: Add macro to use gxvalid service, FT_SERVICE_GX_VALIDATE_H * include/freetype/internal/fttrace.h: Add trace facilities for gxvalid. New files on existing directories: * include/freetype/internal/services/svgxval.h: Registration of validation service for TrueType GX/AAT and classic kern table. * include/freetype/ftgxval.h: Public API definition to use gxvalid. * src/base/ftgxval.c: Public API of gxvalid. New files under src/gxvalid/: * src/gxvalid/Jamfile src/gxvalid/README src/gxvalid/module.mk src/gxvalid/rules.mk src/gxvalid/gxvalid.c src/gxvalid/gxvalid.h src/gxvalid/gxvbsln.c src/gxvalid/gxvcommn.c src/gxvalid/gxvcommn.h src/gxvalid/gxverror.h src/gxvalid/gxvfeat.c src/gxvalid/gxvfgen.c src/gxvalid/gxvjust.c src/gxvalid/gxvkern.c src/gxvalid/gxvlcar.c src/gxvalid/gxvmod.c src/gxvalid/gxvmod.h src/gxvalid/gxvmort.c src/gxvalid/gxvmort.h src/gxvalid/gxvmort0.c src/gxvalid/gxvmort1.c src/gxvalid/gxvmort2.c src/gxvalid/gxvmort4.c src/gxvalid/gxvmort5.c src/gxvalid/gxvmorx.c src/gxvalid/gxvmorx.h src/gxvalid/gxvmorx0.c src/gxvalid/gxvmorx1.c src/gxvalid/gxvmorx2.c src/gxvalid/gxvmorx4.c src/gxvalid/gxvmorx5.c src/gxvalid/gxvopbd.c src/gxvalid/gxvprop.c src/gxvalid/gxvtrak.c: New files, gxvalid body.
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* @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 */