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|
/***************************************************************************/
/* */
/* psaux.h */
/* */
/* Auxiliary functions and data structures related to PostScript fonts */
/* (specification). */
/* */
/* Copyright 1996-2001 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. */
/* */
/***************************************************************************/
#ifndef __PSAUX_H__
#define __PSAUX_H__
#include <ft2build.h>
#include FT_INTERNAL_OBJECTS_H
#include FT_INTERNAL_TYPE1_TYPES_H
FT_BEGIN_HEADER
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** T1_TABLE *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
typedef struct PS_Table_ PS_Table;
/*************************************************************************/
/* */
/* <Struct> */
/* PS_Table_Funcs */
/* */
/* <Description> */
/* A set of function pointers to manage PS_Table objects. */
/* */
/* <Fields> */
/* table_init :: Used to initialize a table. */
/* */
/* table_done :: Finalizes resp. destroy a given table. */
/* */
/* table_add :: Adds a new object to a table. */
/* */
/* table_release :: Releases table data, then finalizes it. */
/* */
typedef struct PS_Table_Funcs_
{
FT_Error
(*init)( PS_Table* table,
FT_Int count,
FT_Memory memory );
void
(*done)( PS_Table* table );
FT_Error
(*add)( PS_Table* table,
FT_Int index,
void* object,
FT_Int length );
void
(*release)( PS_Table* table );
} PS_Table_Funcs;
/*************************************************************************/
/* */
/* <Struct> */
/* PS_Table */
/* */
/* <Description> */
/* A PS_Table is a simple object used to store an array of objects in */
/* a single memory block. */
/* */
/* <Fields> */
/* block :: The address in memory of the growheap's block. This */
/* can change between two object adds, due to */
/* reallocation. */
/* */
/* cursor :: The current top of the grow heap within its block. */
/* */
/* capacity :: The current size of the heap block. Increments by */
/* 1kByte chunks. */
/* */
/* max_elems :: The maximum number of elements in table. */
/* */
/* num_elems :: The current number of elements in table. */
/* */
/* elements :: A table of element addresses within the block. */
/* */
/* lengths :: A table of element sizes within the block. */
/* */
/* memory :: The object used for memory operations */
/* (alloc/realloc). */
/* */
/* funcs :: A table of method pointers for this object. */
/* */
struct PS_Table_
{
FT_Byte* block; /* current memory block */
FT_Offset cursor; /* current cursor in memory block */
FT_Offset capacity; /* current size of memory block */
FT_Long init;
FT_Int max_elems;
FT_Int num_elems;
FT_Byte** elements; /* addresses of table elements */
FT_Int* lengths; /* lengths of table elements */
FT_Memory memory;
PS_Table_Funcs funcs;
};
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** T1 FIELDS & TOKENS *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
typedef struct T1_Parser_ T1_Parser;
/* simple enumeration type used to identify token types */
typedef enum T1_Token_Type_
{
t1_token_none = 0,
t1_token_any,
t1_token_string,
t1_token_array,
/* do not remove */
t1_token_max
} T1_Token_Type;
/* a simple structure used to identify tokens */
typedef struct T1_Token_
{
FT_Byte* start; /* first character of token in input stream */
FT_Byte* limit; /* first character after the token */
T1_Token_Type type; /* type of token */
} T1_Token;
/* enumeration type used to identify object fields */
typedef enum T1_Field_Type_
{
t1_field_none = 0,
t1_field_bool,
t1_field_integer,
t1_field_fixed,
t1_field_string,
t1_field_integer_array,
t1_field_fixed_array,
t1_field_callback,
/* do not remove */
t1_field_max
} T1_Field_Type;
typedef enum T1_Field_Location_
{
t1_field_cid_info,
t1_field_font_dict,
t1_field_font_info,
t1_field_private,
/* do not remove */
t1_field_location_max
} T1_Field_Location;
typedef void
(*T1_Field_Parser)( FT_Face face,
FT_Pointer parser );
/* structure type used to model object fields */
typedef struct T1_Field_
{
const char* ident; /* field identifier */
T1_Field_Location location;
T1_Field_Type type; /* type of field */
T1_Field_Parser reader;
FT_UInt offset; /* offset of field in object */
FT_Byte size; /* size of field in bytes */
FT_UInt array_max; /* maximal number of elements for */
/* array */
FT_UInt count_offset; /* offset of element count for */
/* arrays */
} T1_Field;
#define T1_NEW_SIMPLE_FIELD( _ident, _type, _fname ) \
{ \
_ident, T1CODE, _type, \
0, \
FT_FIELD_OFFSET( _fname ), \
FT_FIELD_SIZE( _fname ), \
0, 0 \
},
#define T1_NEW_CALLBACK_FIELD( _ident, _reader ) \
{ \
_ident, T1CODE, t1_field_callback, \
(T1_Field_Parser)_reader, \
0, 0, \
0, 0 \
},
#define T1_NEW_TABLE_FIELD( _ident, _type, _fname, _max ) \
{ \
_ident, T1CODE, _type, \
0, \
FT_FIELD_OFFSET( _fname ), \
FT_FIELD_SIZE_DELTA( _fname ), \
_max, \
FT_FIELD_OFFSET( num_ ## _fname ) \
},
#define T1_NEW_TABLE_FIELD2( _ident, _type, _fname, _max ) \
{ \
_ident, T1CODE, _type, \
0, \
FT_FIELD_OFFSET( _fname ), \
FT_FIELD_SIZE_DELTA( _fname ), \
_max, 0 \
},
#define T1_FIELD_BOOL( _ident, _fname ) \
T1_NEW_SIMPLE_FIELD( _ident, t1_field_bool, _fname )
#define T1_FIELD_NUM( _ident, _fname ) \
T1_NEW_SIMPLE_FIELD( _ident, t1_field_integer, _fname )
#define T1_FIELD_FIXED( _ident, _fname ) \
T1_NEW_SIMPLE_FIELD( _ident, t1_field_fixed, _fname )
#define T1_FIELD_STRING( _ident, _fname ) \
T1_NEW_SIMPLE_FIELD( _ident, t1_field_string, _fname )
#define T1_FIELD_NUM_TABLE( _ident, _fname, _fmax ) \
T1_NEW_TABLE_FIELD( _ident, t1_field_integer_array, \
_fname, _fmax )
#define T1_FIELD_FIXED_TABLE( _ident, _fname, _fmax ) \
T1_NEW_TABLE_FIELD( _ident, t1_field_fixed_array, \
_fname, _fmax )
#define T1_FIELD_NUM_TABLE2( _ident, _fname, _fmax ) \
T1_NEW_TABLE_FIELD2( _ident, t1_field_integer_array, \
_fname, _fmax )
#define T1_FIELD_FIXED_TABLE2( _ident, _fname, _fmax ) \
T1_NEW_TABLE_FIELD2( _ident, t1_field_fixed_array, \
_fname, _fmax )
#define T1_FIELD_CALLBACK( _ident, _name ) \
T1_NEW_CALLBACK_FIELD( _ident, _name )
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** T1 PARSER *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
typedef struct T1_Parser_Funcs_
{
void
(*init)( T1_Parser* parser,
FT_Byte* base,
FT_Byte* limit,
FT_Memory memory );
void
(*done)( T1_Parser* parser );
void
(*skip_spaces)( T1_Parser* parser );
void
(*skip_alpha)( T1_Parser* parser );
FT_Long
(*to_int)( T1_Parser* parser );
FT_Fixed
(*to_fixed)( T1_Parser* parser,
FT_Int power_ten );
FT_Int
(*to_coord_array)( T1_Parser* parser,
FT_Int max_coords,
FT_Short* coords );
FT_Int
(*to_fixed_array)( T1_Parser* parser,
FT_Int max_values,
FT_Fixed* values,
FT_Int power_ten );
void
(*to_token)( T1_Parser* parser,
T1_Token* token );
void
(*to_token_array)( T1_Parser* parser,
T1_Token* tokens,
FT_UInt max_tokens,
FT_Int* pnum_tokens );
FT_Error
(*load_field)( T1_Parser* parser,
const T1_Field* field,
void** objects,
FT_UInt max_objects,
FT_ULong* pflags );
FT_Error
(*load_field_table)( T1_Parser* parser,
const T1_Field* field,
void** objects,
FT_UInt max_objects,
FT_ULong* pflags );
} T1_Parser_Funcs;
/*************************************************************************/
/* */
/* <Struct> */
/* T1_Parser */
/* */
/* <Description> */
/* A T1_Parser is an object used to parse a Type 1 font very quickly. */
/* */
/* <Fields> */
/* cursor :: The current position in the text. */
/* */
/* base :: Start of the processed text. */
/* */
/* limit :: End of the processed text. */
/* */
/* error :: The last error returned. */
/* */
/* memory :: The object used for memory operations (alloc/realloc). */
/* */
/* funcs :: A table of functions for the parser. */
/* */
struct T1_Parser_
{
FT_Byte* cursor;
FT_Byte* base;
FT_Byte* limit;
FT_Error error;
FT_Memory memory;
T1_Parser_Funcs funcs;
};
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** T1 BUILDER *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
typedef struct T1_Builder_ T1_Builder;
typedef FT_Error
(*T1_Builder_Check_Points_Func)( T1_Builder* builder,
FT_Int count );
typedef void
(*T1_Builder_Add_Point_Func)( T1_Builder* builder,
FT_Pos x,
FT_Pos y,
FT_Byte flag );
typedef FT_Error
(*T1_Builder_Add_Point1_Func)( T1_Builder* builder,
FT_Pos x,
FT_Pos y );
typedef FT_Error
(*T1_Builder_Add_Contour_Func)( T1_Builder* builder );
typedef FT_Error
(*T1_Builder_Start_Point_Func)( T1_Builder* builder,
FT_Pos x,
FT_Pos y );
typedef void
(*T1_Builder_Close_Contour_Func)( T1_Builder* builder );
typedef struct T1_Builder_Funcs_
{
void
(*init)( T1_Builder* builder,
FT_Face face,
FT_Size size,
FT_GlyphSlot slot,
FT_Bool hinting );
void
(*done)( T1_Builder* builder );
T1_Builder_Check_Points_Func check_points;
T1_Builder_Add_Point_Func add_point;
T1_Builder_Add_Point1_Func add_point1;
T1_Builder_Add_Contour_Func add_contour;
T1_Builder_Start_Point_Func start_point;
T1_Builder_Close_Contour_Func close_contour;
} T1_Builder_Funcs;
/*************************************************************************/
/* */
/* <Structure> */
/* T1_Builder */
/* */
/* <Description> */
/* A structure used during glyph loading to store its outline. */
/* */
/* <Fields> */
/* memory :: The current memory object. */
/* */
/* face :: The current face object. */
/* */
/* glyph :: The current glyph slot. */
/* */
/* loader :: XXX */
/* */
/* base :: The base glyph outline. */
/* */
/* current :: The current glyph outline. */
/* */
/* max_points :: maximum points in builder outline */
/* */
/* max_contours :: Maximal number of contours in builder outline. */
/* */
/* last :: The last point position. */
/* */
/* scale_x :: The horizontal scale (FUnits to sub-pixels). */
/* */
/* scale_y :: The vertical scale (FUnits to sub-pixels). */
/* */
/* pos_x :: The horizontal translation (if composite glyph). */
/* */
/* pos_y :: The vertical translation (if composite glyph). */
/* */
/* left_bearing :: The left side bearing point. */
/* */
/* advance :: The horizontal advance vector. */
/* */
/* bbox :: Unused. */
/* */
/* path_begun :: A flag which indicates that a new path has begun. */
/* */
/* load_points :: If this flag is not set, no points are loaded. */
/* */
/* no_recurse :: Set but not used. */
/* */
/* error :: An error code that is only used to report memory */
/* allocation problems. */
/* */
/* metrics_only :: A boolean indicating that we only want to compute */
/* the metrics of a given glyph, not load all of its */
/* points. */
/* */
/* funcs :: An array of function pointers for the builder. */
/* */
struct T1_Builder_
{
FT_Memory memory;
FT_Face face;
FT_GlyphSlot glyph;
FT_GlyphLoader* loader;
FT_Outline* base;
FT_Outline* current;
FT_Vector last;
FT_Fixed scale_x;
FT_Fixed scale_y;
FT_Pos pos_x;
FT_Pos pos_y;
FT_Vector left_bearing;
FT_Vector advance;
FT_BBox bbox; /* bounding box */
FT_Bool path_begun;
FT_Bool load_points;
FT_Bool no_recurse;
FT_Bool shift;
FT_Error error; /* only used for memory errors */
FT_Bool metrics_only;
void* hints_funcs; /* hinter-specific */
void* hints_globals; /* hinter-specific */
T1_Builder_Funcs funcs;
};
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** T1 DECODER *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
#if 0
/*************************************************************************/
/* */
/* T1_MAX_SUBRS_CALLS details the maximum number of nested sub-routine */
/* calls during glyph loading. */
/* */
#define T1_MAX_SUBRS_CALLS 8
/*************************************************************************/
/* */
/* T1_MAX_CHARSTRING_OPERANDS is the charstring stack's capacity. A */
/* minimum of 16 is required. */
/* */
#define T1_MAX_CHARSTRINGS_OPERANDS 32
#endif /* 0 */
typedef struct T1_Decoder_Zone_
{
FT_Byte* cursor;
FT_Byte* base;
FT_Byte* limit;
} T1_Decoder_Zone;
typedef struct T1_Decoder_ T1_Decoder;
typedef struct T1_Decoder_Funcs_ T1_Decoder_Funcs;
typedef FT_Error
(*T1_Decoder_Callback)( T1_Decoder* decoder,
FT_UInt glyph_index );
struct T1_Decoder_Funcs_
{
FT_Error
(*init) ( T1_Decoder* decoder,
FT_Face face,
FT_Size size,
FT_GlyphSlot slot,
FT_Byte** glyph_names,
T1_Blend* blend,
FT_Bool hinting,
T1_Decoder_Callback callback );
void
(*done) ( T1_Decoder* decoder );
FT_Error
(*parse_charstrings)( T1_Decoder* decoder,
FT_Byte* base,
FT_UInt len );
};
struct T1_Decoder_
{
T1_Builder builder;
FT_Long stack[T1_MAX_CHARSTRINGS_OPERANDS];
FT_Long* top;
T1_Decoder_Zone zones[T1_MAX_SUBRS_CALLS + 1];
T1_Decoder_Zone* zone;
PSNames_Interface* psnames; /* for seac */
FT_UInt num_glyphs;
FT_Byte** glyph_names;
FT_Int lenIV; /* internal for sub routine calls */
FT_UInt num_subrs;
FT_Byte** subrs;
FT_Int* subrs_len; /* array of subrs length (optional) */
FT_Matrix font_matrix;
FT_Vector font_offset;
FT_Int flex_state;
FT_Int num_flex_vectors;
FT_Vector flex_vectors[7];
T1_Blend* blend; /* for multiple master support */
T1_Decoder_Callback parse_callback;
T1_Decoder_Funcs funcs;
};
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** PSAux Module Interface *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
typedef struct PSAux_Interface_
{
const PS_Table_Funcs* ps_table_funcs;
const T1_Parser_Funcs* t1_parser_funcs;
const T1_Builder_Funcs* t1_builder_funcs;
const T1_Decoder_Funcs* t1_decoder_funcs;
void
(*t1_decrypt)( FT_Byte* buffer,
FT_Offset length,
FT_UShort seed );
} PSAux_Interface;
FT_END_HEADER
#endif /* __PSAUX_H__ */
/* END */
|
