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/* ttf.h -- header file that defines the top level abstraction of a True Type font, as
* well as the usual typedefs in TTF spec.
* Copyright (C) 1996-1998 Li-Da Lho, All right reserved.
*/
#ifndef __TTF_H
#define __TTF_H
#include <stdio.h>
#ifndef WIN32
#include <unistd.h>
#endif
#include "config.h"
/* $Id: ttf.h,v 1.3 1998/07/06 06:07:01 werner Exp $ */
typedef unsigned char BYTE;
typedef signed char CHAR;
typedef unsigned short USHORT;
typedef signed short SHORT;
#if SIZEOF_INT==4
typedef unsigned int ULONG;
typedef signed int LONG;
#else
#error "Unsupported size of `int' type!"
#endif
typedef ULONG Fixed; /* 16.16 fixed point number used for
* version information */
typedef USHORT FUnit;
typedef SHORT FWord; /* pixel position in the unit of FUnit */
typedef USHORT uFWord;
typedef SHORT F2Dot14; /* 2.14 fixed point number used for
* unit vectors */
typedef LONG F26Dot6; /* 26.6 fixed point number to specify
* pixel positions */
BYTE ttfGetBYTE(FILE *fp);
CHAR ttfGetCHAR(FILE *fp);
USHORT ttfGetUSHORT(FILE *fp);
SHORT ttfGetSHORT(FILE *fp);
ULONG ttfGetULONG(FILE *fp);
LONG ttfGetLONG(FILE *fp);
Fixed ttfGetFixed(FILE *fp);
FUnit ttfGetFUnit(FILE *fp);
FWord ttfGetFWord(FILE *fp);
uFWord ttfGetuFWord(FILE *fp);
F2Dot14 ttfGetF2Dot14(FILE *fp);
/* Read arrays. */
void ttfReadUSHORT(USHORT *array, size_t nelem, FILE *fp);
void ttfReadULONG(ULONG *array, size_t nelem, FILE *fp);
void ttfReadFWord(FWord *array, size_t nelem, FILE *fp);
/* Allocate and read arrays. */
BYTE *ttfMakeBYTE(size_t nelem, FILE *fp);
USHORT *ttfMakeUSHORT(size_t nelem, FILE *fp);
SHORT *ttfMakeSHORT(size_t nelem, FILE *fp);
ULONG *ttfMakeULONG(size_t nelem, FILE *fp);
LONG *ttfMakeLONG(size_t nelem, FILE *fp);
#include "tables.h"
#include "gcache.h"
#include "gstate.h"
typedef struct
{
BYTE opcode;
BYTE *iStream;
}
InstructionDef;
typedef struct
{
BYTE fun;
BYTE *iStream;
}
FunctionDef;
typedef struct
{
/* data for instructions */
BYTE *iStream; /* instruction stream */
USHORT ip; /* instruction pointer */
USHORT insLength; /* instruction length */
LONG *StorageArea; /* storage area */
LONG *Stack; /* stack */
USHORT sp; /* stack pointer */
USHORT stklimit; /* stack limit */
/* data about point size and resolution */
ULONG ppem; /* pixel per em */
ULONG xres; /* x resolution in dpi */
ULONG yres; /* y resolution in dpi */
F26Dot6 pointsize; /* the point size of the font */
/* data for grahpics stat and cvt */
F26Dot6 *cvt; /* Control value table, scaled form cvt in
* TTFont */
GraphicsState gstate; /* graphics state used for instructions */
GraphicsState gstate_init; /* initial graphics state after fpgm and cvt
* programs are executed */
#if 0
/* user definded instructions and functions */
InstructionDef iDef; /* instruction definitions */
FunctionDef fDef; /* function definitions */
#endif
int Error_State; /* error state indicate the error */
}
VirtualMachine;
typedef struct
{
/* misc informations */
FILE *fp;
char *ttfname;
int *refcount; /* how many instances of this font */
Fixed version;
USHORT numTables; /* it seems not necessary to hold all the
* OffsetTables */
ULONG glyphOffset; /* where the glyph table starts */
TableDirPtr dir; /* Pointer to Table Directories */
SubTablePtr encoding; /* `encoding' is the currently used encoding
* table */
USHORT numCacheElements; /* number of glyph cache elements */
VirtualMachine vm; /* the virtual machine */
GlyphCachePtr gcache; /* pointer to glyph cache */
/* required tables */
CMAPPtr cmap;
HEADPtr head;
HHEAPtr hhea;
HMTXPtr hmtx;
LOCAPtr loca;
MAXPPtr maxp;
NAMEPtr name;
POSTPtr post;
OS_2Ptr os2;
/* optional tables */
FWord *cvt; /* control value table, not scaled yet */
USHORT cvtLength; /* number of FWords of CVT */
BYTE *fpgm; /* font program */
USHORT fpgmLength; /* number of bytes of fpgm */
BYTE *prep; /* cvt program */
USHORT prepLength; /* number of bytes of prep */
/* those optional tables seem not to be necessary for a True Type font
* server */
GASPPtr gasp;
HDMXPtr hdmx;
KERNPtr kern;
LTSHPtr ltsh;
PCLTPtr pclt;
VDMXPtr vdmx;
VHEAPtr vhea;
VMTXPtr vmtx;
}
TTFont, *TTFontPtr;
TTFontPtr ttfInitFont(char *filename);
void ttfLoadFont(TTFontPtr font, ULONG offset);
void ttfFreeFont(TTFontPtr font);
#include "loadtable.h"
#endif /* __TTF_H */
/* end of ttf.h */
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