harvey/sys/src/cmd/gs/src/ifont.h

/* Copyright (C) 1989, 2000 Aladdin Enterprises.  All rights reserved.
  
  This file is part of AFPL Ghostscript.
  
  AFPL Ghostscript is distributed with NO WARRANTY OF ANY KIND.  No author or
  distributor accepts any responsibility for the consequences of using it, or
  for whether it serves any particular purpose or works at all, unless he or
  she says so in writing.  Refer to the Aladdin Free Public License (the
  "License") for full details.
  
  Every copy of AFPL Ghostscript must include a copy of the License, normally
  in a plain ASCII text file named PUBLIC.  The License grants you the right
  to copy, modify and redistribute AFPL Ghostscript, but only under certain
  conditions described in the License.  Among other things, the License
  requires that the copyright notice and this notice be preserved on all
  copies.
*/

/*$Id: ifont.h,v 1.6 2000/12/03 23:35:30 lpd Exp $ */
/* Interpreter internal font representation */

#ifndef ifont_INCLUDED
#  define ifont_INCLUDED

#include "gsccode.h"		/* for gs_glyph, NUM_KNOWN_ENCODINGS */
#include "gsstype.h"		/* for extern_st */

/* The external definition of fonts is given in the PostScript manual, */
/* pp. 91-93. */

/* The structure given below is 'client data' from the viewpoint */
/* of the library.  font-type objects (t_struct/st_font, "t_fontID") */
/* point directly to a gs_font.  */

typedef struct font_data_s {
    ref dict;			/* font dictionary object */
    ref BuildChar;
    ref BuildGlyph;
    ref Encoding;
    ref CharStrings;
    union _fs {
	struct _f1 {
	    ref OtherSubrs;	/* from Private dictionary */
	    ref Subrs;		/* from Private dictionary */
	    ref GlobalSubrs;	/* from Private dictionary, */
	    /* for Type 2 charstrings */
	} type1;
	struct _f42 {
	    ref sfnts;
	    ref CIDMap;		/* for CIDFontType 2 fonts */
	    ref GlyphDirectory;
	} type42;
	struct _fc0 {
	    ref GlyphDirectory;
	    ref GlyphData;	/* (if preloaded) string or array of strings */
	    ref DataSource;	/* (if not preloaded) reusable stream */
	} cid0;
    } u;
} font_data;

/*
 * Even though the interpreter's part of the font data actually
 * consists of refs, allocating it as refs tends to create sandbars;
 * since it is always allocated and freed as a unit, we can treat it
 * as an ordinary structure.
 */
/* st_font_data is exported for zdefault_make_font in zfont.c. */
extern_st(st_font_data);
#define public_st_font_data()	/* in zbfont.c */\
  gs_public_st_ref_struct(st_font_data, font_data, "font_data")
#define pfont_data(pfont) ((font_data *)((pfont)->client_data))
#define pfont_dict(pfont) (&pfont_data(pfont)->dict)

/* Registered encodings, for the benefit of platform fonts, `seac', */
/* and compiled font initialization. */
/* This is a t_array ref that points to the encodings. */
#define registered_Encodings_countof NUM_KNOWN_ENCODINGS
extern ref registered_Encodings;

#define registered_Encoding(i) (registered_Encodings.value.refs[i])
#define StandardEncoding registered_Encoding(0)

/* ================Internal procedures shared across files ================ */

/* ---------------- Exported by zchar.c ---------------- */

/*
 * Get the FontBBox from a font dictionary, if any; if none, or if invalid,
 * return 4 zeros.
 */
int font_bbox_param(P2(const ref * pfdict, double bbox[4]));

/* ---------------- Exported by zfont.c ---------------- */

#ifndef gs_font_DEFINED
#  define gs_font_DEFINED
typedef struct gs_font_s gs_font;
#endif

/*
 * Check a parameter that should be a valid font dictionary, and return
 * the gs_font stored in its FID entry.
 */
int font_param(P2(const ref * pfdict, gs_font ** ppfont));

/*
 * Mark a glyph as a PostScript name (if it isn't a CID) for the garbage
 * collector.  Return true if a mark was just added.  This procedure is
 * intended to be used as the mark_glyph procedure in the character cache.
 */
bool zfont_mark_glyph_name(P2(gs_glyph glyph, void *ignore_data));

/*
 * Return information about a font, including information from the FontInfo
 * dictionary.  This procedure is intended to be used as the font_info
 * procedure in all PostScript fonts.
 */
font_proc_font_info(zfont_info);

#endif /* ifont_INCLUDED */