/* @(#)fontcache.h 9.2 88/01/19 SMI	 */

/*
 * Copyright (c) 1985 by Sun Microsystems, Inc.
 */

/*-
	Definitions for the font cacheing mechanism

	fontcache.h, Mon Dec  2 11:23:37 1985

		James Gosling,
		Sun Microsystems
 */

#ifndef FONTHASHSIZE

#ifndef NEW_FONT_MAGIC
#include "font.h"
#endif

struct cachedfont {		/* A cached font */
    int         hash;		/* The matrix hash for this font */
    char        valid;		/* True iff the font part of this cachedfont
				 * is valid */
    short       refcnt;		/* Pad out to 32 bits for compatibility with
				 * machines that do long word int alignment */
    struct cachedfont *next;	/* Next font in same hash bucket */
    struct font font;		/* The actual font in this cache entry */
};


#define FONTHASHSIZE 37		/* Prime numbers are good */
#define FONTTABLESIZE 73

#define HASHFONT(m) ((m)[0][0]+(m)[0][1]+(m)[1][0]+(m)[1][1])

/*
 * The fonts in a font family are indexed two ways.  First there is a chained
 * hash table where the encoding and transformation matrix are used as the
 * key.  It is used for general font lookup.  Second is a table of fonts which
 * all have the property that their transformation matrix is of the form [s 0
 * 0 s] - uniform scaling with no rotation.  This table is indexed by
 * roundfr(s).  No slot of this table will ever be nil - "best match"
 * computations will have already been done.
 */
struct fontfamily {
    union {
	int         magic;	/* FONTFAMILYMAGIC */
	int         (*buildchar) ();	/* Set if this font has a BuildChar */
    }           m;
    char       *FamilyName;	/* eg. "Times-Roman" */
    char       *directory;	/* The directory that this family came from
				 * (only used when validiating cache entries) */
    struct cachedfont *printermatched;	/* printer matching table */
    struct cachedfont *hash[FONTHASHSIZE];
    struct cachedfont *table[FONTTABLESIZE];
};


#define FONTFAMILYMAGIC  0x137A2947

struct psfont {
    struct fontfamily *family;
    fract       matrix[2][2];
    char        simplescale;	/* true iff matrix==[s 0 0 s] */
    int		refcnt;		/* Number of references to this font */
    unsigned short *remap;	/* points to a translation table if this is
				 * just a remapped font */
    short       revision;	/* Matched against the last transform that
				 * lasthit was validated against */
    struct cachedfont *lasthit;
};

#define psf_incref(psf) ((psf)->refcnt++)
#define psf_decref(psf) {if (--(psf)->refcnt<=0) { qtfree(psf); }}
#endif