📄 ftobjs.h
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/***************************************************************************/
/* */
/* ftobjs.h */
/* */
/* The FreeType private base classes (specification). */
/* */
/* Copyright 1996-2001, 2002, 2003, 2004 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. */
/* */
/***************************************************************************/
/*************************************************************************/
/* */
/* This file contains the definition of all internal FreeType classes. */
/* */
/*************************************************************************/
#ifndef __FTOBJS_H__
#define __FTOBJS_H__
#include <ft2build.h>
#include FT_CONFIG_STANDARD_LIBRARY_H /* for ft_setjmp and ft_longjmp */
#include FT_RENDER_H
#include FT_SIZES_H
#include FT_INTERNAL_MEMORY_H
#include FT_INTERNAL_GLYPH_LOADER_H
#include FT_INTERNAL_DRIVER_H
#include FT_INTERNAL_AUTOHINT_H
#include FT_INTERNAL_SERVICE_H
#ifdef FT_CONFIG_OPTION_INCREMENTAL
#include FT_INCREMENTAL_H
#endif
FT_BEGIN_HEADER
/*************************************************************************/
/* */
/* Some generic definitions. */
/* */
#ifndef TRUE
#define TRUE 1
#endif
#ifndef FALSE
#define FALSE 0
#endif
#ifndef NULL
#define NULL (void*)0
#endif
/*************************************************************************/
/* */
/* The min and max functions missing in C. As usual, be careful not to */
/* write things like FT_MIN( a++, b++ ) to avoid side effects. */
/* */
#define FT_MIN( a, b ) ( (a) < (b) ? (a) : (b) )
#define FT_MAX( a, b ) ( (a) > (b) ? (a) : (b) )
#define FT_ABS( a ) ( (a) < 0 ? -(a) : (a) )
#define FT_PAD_FLOOR( x, n ) ( (x) & ~((n)-1) )
#define FT_PAD_ROUND( x, n ) FT_PAD_FLOOR( (x) + ((n)/2), n )
#define FT_PAD_CEIL( x, n ) FT_PAD_FLOOR( (x) + ((n)-1), n )
#define FT_PIX_FLOOR( x ) ( (x) & ~63 )
#define FT_PIX_ROUND( x ) FT_PIX_FLOOR( (x) + 32 )
#define FT_PIX_CEIL( x ) FT_PIX_FLOOR( (x) + 63 )
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/**** ****/
/**** ****/
/**** V A L I D A T I O N ****/
/**** ****/
/**** ****/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/* handle to a validation object */
typedef struct FT_ValidatorRec_* FT_Validator;
/*************************************************************************/
/* */
/* There are three distinct validation levels defined here: */
/* */
/* FT_VALIDATE_DEFAULT :: */
/* A table that passes this validation level can be used reliably by */
/* FreeType. It generally means that all offsets have been checked to */
/* prevent out-of-bound reads, array counts are correct, etc. */
/* */
/* FT_VALIDATE_TIGHT :: */
/* A table that passes this validation level can be used reliably and */
/* doesn't contain invalid data. For example, a charmap table that */
/* returns invalid glyph indices will not pass, even though it can */
/* be used with FreeType in default mode (the library will simply */
/* return an error later when trying to load the glyph). */
/* */
/* It also check that fields that must be a multiple of 2, 4, or 8 */
/* don't have incorrect values, etc. */
/* */
/* FT_VALIDATE_PARANOID :: */
/* Only for font debugging. Checks that a table follows the */
/* specification by 100%. Very few fonts will be able to pass this */
/* level anyway but it can be useful for certain tools like font */
/* editors/converters. */
/* */
typedef enum FT_ValidationLevel_
{
FT_VALIDATE_DEFAULT = 0,
FT_VALIDATE_TIGHT,
FT_VALIDATE_PARANOID
} FT_ValidationLevel;
/* validator structure */
typedef struct FT_ValidatorRec_
{
const FT_Byte* base; /* address of table in memory */
const FT_Byte* limit; /* `base' + sizeof(table) in memory */
FT_ValidationLevel level; /* validation level */
FT_Error error; /* error returned. 0 means success */
ft_jmp_buf jump_buffer; /* used for exception handling */
} FT_ValidatorRec;
#define FT_VALIDATOR( x ) ((FT_Validator)( x ))
FT_BASE( void )
ft_validator_init( FT_Validator valid,
const FT_Byte* base,
const FT_Byte* limit,
FT_ValidationLevel level );
FT_BASE( FT_Int )
ft_validator_run( FT_Validator valid );
/* Sets the error field in a validator, then calls `longjmp' to return */
/* to high-level caller. Using `setjmp/longjmp' avoids many stupid */
/* error checks within the validation routines. */
/* */
FT_BASE( void )
ft_validator_error( FT_Validator valid,
FT_Error error );
/* Calls ft_validate_error. Assumes that the `valid' local variable */
/* holds a pointer to the current validator object. */
/* */
#define FT_INVALID( _error ) ft_validator_error( valid, _error )
/* called when a broken table is detected */
#define FT_INVALID_TOO_SHORT FT_INVALID( FT_Err_Invalid_Table )
/* called when an invalid offset is detected */
#define FT_INVALID_OFFSET FT_INVALID( FT_Err_Invalid_Offset )
/* called when an invalid format/value is detected */
#define FT_INVALID_FORMAT FT_INVALID( FT_Err_Invalid_Table )
/* called when an invalid glyph index is detected */
#define FT_INVALID_GLYPH_ID FT_INVALID( FT_Err_Invalid_Glyph_Index )
/* called when an invalid field value is detected */
#define FT_INVALID_DATA FT_INVALID( FT_Err_Invalid_Table )
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/**** ****/
/**** ****/
/**** C H A R M A P S ****/
/**** ****/
/**** ****/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/* handle to internal charmap object */
typedef struct FT_CMapRec_* FT_CMap;
/* handle to charmap class structure */
typedef const struct FT_CMap_ClassRec_* FT_CMap_Class;
/* internal charmap object structure */
typedef struct FT_CMapRec_
{
FT_CharMapRec charmap;
FT_CMap_Class clazz;
} FT_CMapRec;
/* typecase any pointer to a charmap handle */
#define FT_CMAP( x ) ((FT_CMap)( x ))
/* obvious macros */
#define FT_CMAP_PLATFORM_ID( x ) FT_CMAP( x )->charmap.platform_id
#define FT_CMAP_ENCODING_ID( x ) FT_CMAP( x )->charmap.encoding_id
#define FT_CMAP_ENCODING( x ) FT_CMAP( x )->charmap.encoding
#define FT_CMAP_FACE( x ) FT_CMAP( x )->charmap.face
/* class method definitions */
typedef FT_Error
(*FT_CMap_InitFunc)( FT_CMap cmap,
FT_Pointer init_data );
typedef void
(*FT_CMap_DoneFunc)( FT_CMap cmap );
typedef FT_UInt
(*FT_CMap_CharIndexFunc)( FT_CMap cmap,
FT_UInt32 char_code );
typedef FT_UInt
(*FT_CMap_CharNextFunc)( FT_CMap cmap,
FT_UInt32 *achar_code );
typedef struct FT_CMap_ClassRec_
{
FT_ULong size;
FT_CMap_InitFunc init;
FT_CMap_DoneFunc done;
FT_CMap_CharIndexFunc char_index;
FT_CMap_CharNextFunc char_next;
} FT_CMap_ClassRec;
/* create a new charmap and add it to charmap->face */
FT_BASE( FT_Error )
FT_CMap_New( FT_CMap_Class clazz,
FT_Pointer init_data,
FT_CharMap charmap,
FT_CMap *acmap );
/* destroy a charmap (don't remove it from face's list though) */
FT_BASE( void )
FT_CMap_Done( FT_CMap cmap );
/*************************************************************************/
/* */
/* <Struct> */
/* FT_Face_InternalRec */
/* */
/* <Description> */
/* This structure contains the internal fields of each FT_Face */
/* object. These fields may change between different releases of */
/* FreeType. */
/* */
/* <Fields> */
/* max_points :: */
/* The maximal number of points used to store the vectorial outline */
/* of any glyph in this face. If this value cannot be known in */
/* advance, or if the face isn't scalable, this should be set to 0. */
/* Only relevant for scalable formats. */
/* */
/* max_contours :: */
/* The maximal number of contours used to store the vectorial */
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