src/common/font.c

/* Copyright (c) 1992 Regents of the University of California */

#ifndef lint
static char SCCSid[] = "$SunId$ LBL";
#endif

/*
 * Polygonal font handling routines
 */

#include "standard.h"

#include "font.h"

#define galloc(nv)      (GLYPH *)malloc(sizeof(GLYPH)+2*sizeof(GORD)*(nv))


extern char  *libpath;                  /* list of library directories */

extern char  *fgetword();

static FONT     *fontlist = NULL;       /* list of loaded fonts */


FONT *
getfont(fname)                          /* return font fname */
char  *fname;
{
        char  buf[16];
        FILE  *fp;
        char  *pathname, *err;
        unsigned  wsum, hsum, ngly;
        int  gn, ngv;
        register int  gv;
        register GLYPH  *g;
        GORD  *gp;
        register FONT  *f;

        for (f = fontlist; f != NULL; f = f->next)
                if (!strcmp(f->name, fname))
                        return(f);
                                                /* load the font file */
        if ((pathname = getpath(fname, libpath, R_OK)) == NULL) {
                sprintf(errmsg, "cannot find font file \"%s\"", fname);
                error(USER, errmsg);
        }
        f = (FONT *)calloc(1, sizeof(FONT));
        if (f == NULL)
                goto memerr;
        f->name = savestr(fname);
        if ((fp = fopen(pathname, "r")) == NULL) {
                sprintf(errmsg, "cannot open font file \"%s\"",
                                pathname);
                error(SYSTEM, errmsg);
        }
        wsum = hsum = ngly = 0;
        while (fgetword(buf,sizeof(buf),fp) != NULL) {  /* get each glyph */
                if (!isint(buf))
                        goto nonint;
                gn = atoi(buf);
                if (gn < 1 || gn > 255) {
                        err = "illegal";
                        goto fonterr;
                }
                if (f->fg[gn] != NULL) {
                        err = "duplicate";
                        goto fonterr;
                }
                if (fgetword(buf,sizeof(buf),fp) == NULL || !isint(buf) ||
                                (ngv = atoi(buf)) < 0 || ngv > 32000) {
                        err = "bad # vertices for";
                        goto fonterr;
                }
                g = galloc(ngv);
                if (g == NULL)
                        goto memerr;
                g->nverts = ngv;
                g->left = g->right = g->top = g->bottom = 128;
                ngv *= 2;
                gp = gvlist(g);
                while (ngv--) {
                        if (fgetword(buf,sizeof(buf),fp) == NULL ||
                                        !isint(buf) ||
                                        (gv = atoi(buf)) < 0 || gv > 255) {
                                err = "bad vertex for";
                                goto fonterr;
                        }
                        *gp++ = gv;
                        if (ngv & 1) {          /* follow x limits */
                                if (gv < g->left)
                                        g->left = gv;
                                else if (gv > g->right)
                                        g->right = gv;
                        } else {                /* follow y limits */
                                if (gv < g->bottom)
                                        g->bottom = gv;
                                else if (gv > g->top)
                                        g->top = gv;
                        }
                }
                if (g->right - g->left && g->top - g->bottom) {
                        ngly++;
                        wsum += g->right - g->left;
                        hsum += g->top - g->bottom;
                }
                f->fg[gn] = g;
        }
        fclose(fp);
        if (ngly) {
                f->mwidth = wsum / ngly;
                f->mheight = hsum / ngly;
        }
        f->next = fontlist;
        return(fontlist = f);
nonint:
        sprintf(errmsg, "non-integer in font file \"%s\"", pathname);
        error(USER, errmsg);
fonterr:
        sprintf(errmsg, "%s character (%d) in font file \"%s\"",
                        err, gn, pathname);
        error(USER, errmsg);
memerr:
        error(SYSTEM, "out of memory in fontglyph");
}


freefont(fname)                 /* free a font (free all if fname==NULL) */
char  *fname;
{
        FONT  head;
        register FONT  *fl, *f;
        register int  i;

        head.next = fontlist;
        fl = &head;
        while ((f = fl->next) != NULL)
                if (fname == NULL || !strcmp(fname, f->name)) {
                        fl->next = f->next;
                        for (i = 0; i < 256; i++)
                                if (f->fg[i] != NULL)
                                        free((char *)f->fg[i]);
                        freestr(f->name);
                        free((char *)f);
                } else
                        fl = f;
        fontlist = head.next;
}


int
uniftext(sp, tp, f)                     /* uniformly space text line */
register short  *sp;            /* returned character spacing */
register char  *tp;             /* text line */
register FONT  *f;              /* font */
{
        int  linelen;

        linelen = *sp++ = 0;
        while (*tp)
                if (f->fg[*tp++&0xff] == NULL)
                        *sp++ = 0;
                else
                        linelen += *sp++ = 256;
        return(linelen);
}


int
squeeztext(sp, tp, f, cis)              /* squeeze text line */
short  *sp;                     /* returned character spacing */
char  *tp;                      /* text line */
FONT  *f;                       /* font */
int  cis;                       /* intercharacter spacing */
{
        int  linelen;
        register GLYPH  *gp;

        gp = NULL;
        while (*tp && (gp = f->fg[*tp++&0xff]) == NULL)
                *sp++ = 0;
        cis /= 2;
        linelen = *sp = cis;
        while (gp != NULL) {
                if (gp->nverts) {               /* regular character */
                        linelen += *sp++ += cis - gp->left;
                        *sp = gp->right + cis;
                } else {                        /* space */
                        linelen += *sp++;
                        *sp = f->mwidth;
                }
                gp = NULL;
                while (*tp && (gp = f->fg[*tp++&0xff]) == NULL) {
                        linelen += *sp++;
                        *sp = 0;
                }
        }
        linelen += *sp += cis;
        return(linelen);
}


int
proptext(sp, tp, f, cis, nsi)           /* space line proportionally */
short  *sp;                     /* returned character spacing */
char  *tp;                      /* text line */
FONT  *f;                       /* font */
int  cis;                       /* target intercharacter spacing */
int  nsi;                       /* minimum number of spaces for indent */
{
        register char  *end, *tab;
        GLYPH  *gp;
        short  *nsp;
        int  alen, len, width;
                                        /* start by squeezing it */
        squeeztext(sp, tp, f, cis);
                                        /* now, realign spacing */
        width = *sp++;
        while (*tp) {
                len = alen = 0;
                nsp = sp;
                for (end = tp; *end; end = tab) {
                        tab = end + 1;
                        alen += *nsp++;
                        if (f->fg[*end&0xff]) {
                                while ((gp = f->fg[*tab&0xff]) != NULL &&
                                                gp->nverts == 0) { /* tab in */
                                        alen += *nsp++;
                                        tab++;
                                }
                                len += tab - end;
                        }
                        if (nsi && tab - end > nsi)
                                break;
                }
                len *= f->mwidth + cis;         /* compute target length */
                width += len;
                len -= alen;                    /* necessary adjustment */
                while (sp < nsp) {
                        alen = len/(nsp-sp);
                        *sp++ += alen;
                        len -= alen;
                }
                tp = tab;
        }
        return(width);
}
Revision:	2.7
Committed:	Fri May 14 11:30:17 1993 UTC (30 years, 11 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.6:	+2 -4 lines
Log Message:	fixed bug in proptext() that caused it to report incorrect width
#	User	Rev	Content
1	greg	2.1	/* Copyright (c) 1992 Regents of the University of California */
2
3			#ifndef lint
4			static char SCCSid[] = "$SunId$ LBL";
5			#endif
6
7			/*
8			* Polygonal font handling routines
9			*/
10
11			#include "standard.h"
12
13			#include "font.h"
14
15			#define galloc(nv) (GLYPH )malloc(sizeof(GLYPH)+2sizeof(GORD)*(nv))
16
17
18			extern char libpath; / list of library directories */
19
20	greg	2.5	extern char *fgetword();
21
22	greg	2.1	static FONT fontlist = NULL; / list of loaded fonts */
23
24
25			FONT *
26			getfont(fname) /* return font fname */
27			char *fname;
28			{
29			char buf[16];
30			FILE *fp;
31			char pathname, err;
32	greg	2.3	unsigned wsum, hsum, ngly;
33	greg	2.1	int gn, ngv;
34			register int gv;
35	greg	2.5	register GLYPH *g;
36	greg	2.1	GORD *gp;
37			register FONT *f;
38
39			for (f = fontlist; f != NULL; f = f->next)
40			if (!strcmp(f->name, fname))
41			return(f);
42			/* load the font file */
43			if ((pathname = getpath(fname, libpath, R_OK)) == NULL) {
44			sprintf(errmsg, "cannot find font file \"%s\"", fname);
45			error(USER, errmsg);
46			}
47			f = (FONT *)calloc(1, sizeof(FONT));
48			if (f == NULL)
49			goto memerr;
50			f->name = savestr(fname);
51			if ((fp = fopen(pathname, "r")) == NULL) {
52			sprintf(errmsg, "cannot open font file \"%s\"",
53			pathname);
54			error(SYSTEM, errmsg);
55			}
56	greg	2.3	wsum = hsum = ngly = 0;
57	greg	2.1	while (fgetword(buf,sizeof(buf),fp) != NULL) { /* get each glyph */
58			if (!isint(buf))
59			goto nonint;
60			gn = atoi(buf);
61	greg	2.3	if (gn < 1 \|\| gn > 255) {
62	greg	2.1	err = "illegal";
63			goto fonterr;
64			}
65			if (f->fg[gn] != NULL) {
66			err = "duplicate";
67			goto fonterr;
68			}
69			if (fgetword(buf,sizeof(buf),fp) == NULL \|\| !isint(buf) \|\|
70			(ngv = atoi(buf)) < 0 \|\| ngv > 32000) {
71			err = "bad # vertices for";
72			goto fonterr;
73			}
74			g = galloc(ngv);
75			if (g == NULL)
76			goto memerr;
77			g->nverts = ngv;
78	greg	2.2	g->left = g->right = g->top = g->bottom = 128;
79	greg	2.1	ngv *= 2;
80			gp = gvlist(g);
81			while (ngv--) {
82			if (fgetword(buf,sizeof(buf),fp) == NULL \|\|
83			!isint(buf) \|\|
84			(gv = atoi(buf)) < 0 \|\| gv > 255) {
85			err = "bad vertex for";
86			goto fonterr;
87			}
88			*gp++ = gv;
89	greg	2.2	if (ngv & 1) { /* follow x limits */
90			if (gv < g->left)
91			g->left = gv;
92			else if (gv > g->right)
93			g->right = gv;
94			} else { /* follow y limits */
95			if (gv < g->bottom)
96			g->bottom = gv;
97			else if (gv > g->top)
98			g->top = gv;
99			}
100	greg	2.1	}
101	greg	2.3	if (g->right - g->left && g->top - g->bottom) {
102			ngly++;
103			wsum += g->right - g->left;
104			hsum += g->top - g->bottom;
105			}
106	greg	2.1	f->fg[gn] = g;
107			}
108			fclose(fp);
109	greg	2.3	if (ngly) {
110			f->mwidth = wsum / ngly;
111			f->mheight = hsum / ngly;
112			}
113	greg	2.1	f->next = fontlist;
114			return(fontlist = f);
115			nonint:
116			sprintf(errmsg, "non-integer in font file \"%s\"", pathname);
117			error(USER, errmsg);
118			fonterr:
119			sprintf(errmsg, "%s character (%d) in font file \"%s\"",
120			err, gn, pathname);
121			error(USER, errmsg);
122			memerr:
123			error(SYSTEM, "out of memory in fontglyph");
124			}
125	greg	2.2
126
127	greg	2.6	freefont(fname) /* free a font (free all if fname==NULL) */
128			char *fname;
129			{
130			FONT head;
131			register FONT fl, f;
132			register int i;
133
134			head.next = fontlist;
135			fl = &head;
136			while ((f = fl->next) != NULL)
137			if (fname == NULL \|\| !strcmp(fname, f->name)) {
138			fl->next = f->next;
139			for (i = 0; i < 256; i++)
140			if (f->fg[i] != NULL)
141			free((char *)f->fg[i]);
142			freestr(f->name);
143			free((char *)f);
144			} else
145			fl = f;
146			fontlist = head.next;
147			}
148
149
150	greg	2.2	int
151	greg	2.3	uniftext(sp, tp, f) /* uniformly space text line */
152	greg	2.5	register short sp; / returned character spacing */
153	greg	2.3	register char tp; / text line */
154			register FONT f; / font */
155			{
156			int linelen;
157
158			linelen = *sp++ = 0;
159			while (*tp)
160			if (f->fg[*tp++&0xff] == NULL)
161			*sp++ = 0;
162			else
163			linelen += *sp++ = 256;
164			return(linelen);
165			}
166
167
168			int
169	greg	2.2	squeeztext(sp, tp, f, cis) /* squeeze text line */
170			short sp; / returned character spacing */
171			char tp; / text line */
172			FONT f; / font */
173			int cis; /* intercharacter spacing */
174			{
175			int linelen;
176	greg	2.5	register GLYPH *gp;
177	greg	2.2
178			gp = NULL;
179			while (tp && (gp = f->fg[tp++&0xff]) == NULL)
180			*sp++ = 0;
181			cis /= 2;
182	greg	2.3	linelen = *sp = cis;
183	greg	2.2	while (gp != NULL) {
184			if (gp->nverts) { /* regular character */
185			linelen += *sp++ += cis - gp->left;
186			*sp = gp->right + cis;
187			} else { /* space */
188			linelen += *sp++;
189	greg	2.3	*sp = f->mwidth;
190	greg	2.2	}
191			gp = NULL;
192			while (tp && (gp = f->fg[tp++&0xff]) == NULL) {
193			linelen += *sp++;
194			*sp = 0;
195			}
196			}
197	greg	2.3	linelen += *sp += cis;
198	greg	2.2	return(linelen);
199			}
200
201
202	greg	2.3	int
203	greg	2.2	proptext(sp, tp, f, cis, nsi) /* space line proportionally */
204			short sp; / returned character spacing */
205			char tp; / text line */
206			FONT f; / font */
207			int cis; /* target intercharacter spacing */
208			int nsi; /* minimum number of spaces for indent */
209			{
210	greg	2.3	register char end, tab;
211			GLYPH *gp;
212			short *nsp;
213			int alen, len, width;
214			/* start by squeezing it */
215			squeeztext(sp, tp, f, cis);
216			/* now, realign spacing */
217	greg	2.7	width = *sp++;
218	greg	2.3	while (*tp) {
219	greg	2.7	len = alen = 0;
220	greg	2.3	nsp = sp;
221			for (end = tp; *end; end = tab) {
222			tab = end + 1;
223			alen += *nsp++;
224			if (f->fg[*end&0xff]) {
225			while ((gp = f->fg[*tab&0xff]) != NULL &&
226			gp->nverts == 0) { /* tab in */
227			alen += *nsp++;
228			tab++;
229			}
230			len += tab - end;
231			}
232	greg	2.4	if (nsi && tab - end > nsi)
233	greg	2.3	break;
234			}
235			len = f->mwidth + cis; / compute target length */
236			width += len;
237			len -= alen; /* necessary adjustment */
238			while (sp < nsp) {
239			alen = len/(nsp-sp);
240			*sp++ += alen;
241			len -= alen;
242			}
243			tp = tab;
244			}
245			return(width);
246	greg	2.2	}