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  *fgetword(), *getlibpath();

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, getlibpath(), 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;

        linelen = 0;
        gp = NULL;
        while (*tp && (gp = f->fg[*tp++&0xff]) == NULL)
                *sp++ = 0;
        cis /= 2;
        *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:	2.9
Committed:	Thu Apr 14 04:44:43 1994 UTC (30 years, 6 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.8:	+2 -4 lines
Log Message:	changed extern libpath to extern getlibpath()
#	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	greg	2.9	extern char fgetword(), getlibpath();
19	greg	2.1
20			static FONT fontlist = NULL; / list of loaded fonts */
21
22
23			FONT *
24			getfont(fname) /* return font fname */
25			char *fname;
26			{
27			char buf[16];
28			FILE *fp;
29			char pathname, err;
30	greg	2.3	unsigned wsum, hsum, ngly;
31	greg	2.1	int gn, ngv;
32			register int gv;
33	greg	2.5	register GLYPH *g;
34	greg	2.1	GORD *gp;
35			register FONT *f;
36
37			for (f = fontlist; f != NULL; f = f->next)
38			if (!strcmp(f->name, fname))
39			return(f);
40			/* load the font file */
41	greg	2.9	if ((pathname = getpath(fname, getlibpath(), R_OK)) == NULL) {
42	greg	2.1	sprintf(errmsg, "cannot find font file \"%s\"", fname);
43			error(USER, errmsg);
44			}
45			f = (FONT *)calloc(1, sizeof(FONT));
46			if (f == NULL)
47			goto memerr;
48			f->name = savestr(fname);
49			if ((fp = fopen(pathname, "r")) == NULL) {
50			sprintf(errmsg, "cannot open font file \"%s\"",
51			pathname);
52			error(SYSTEM, errmsg);
53			}
54	greg	2.3	wsum = hsum = ngly = 0;
55	greg	2.1	while (fgetword(buf,sizeof(buf),fp) != NULL) { /* get each glyph */
56			if (!isint(buf))
57			goto nonint;
58			gn = atoi(buf);
59	greg	2.3	if (gn < 1 \|\| gn > 255) {
60	greg	2.1	err = "illegal";
61			goto fonterr;
62			}
63			if (f->fg[gn] != NULL) {
64			err = "duplicate";
65			goto fonterr;
66			}
67			if (fgetword(buf,sizeof(buf),fp) == NULL \|\| !isint(buf) \|\|
68			(ngv = atoi(buf)) < 0 \|\| ngv > 32000) {
69			err = "bad # vertices for";
70			goto fonterr;
71			}
72			g = galloc(ngv);
73			if (g == NULL)
74			goto memerr;
75			g->nverts = ngv;
76	greg	2.2	g->left = g->right = g->top = g->bottom = 128;
77	greg	2.1	ngv *= 2;
78			gp = gvlist(g);
79			while (ngv--) {
80			if (fgetword(buf,sizeof(buf),fp) == NULL \|\|
81			!isint(buf) \|\|
82			(gv = atoi(buf)) < 0 \|\| gv > 255) {
83			err = "bad vertex for";
84			goto fonterr;
85			}
86			*gp++ = gv;
87	greg	2.2	if (ngv & 1) { /* follow x limits */
88			if (gv < g->left)
89			g->left = gv;
90			else if (gv > g->right)
91			g->right = gv;
92			} else { /* follow y limits */
93			if (gv < g->bottom)
94			g->bottom = gv;
95			else if (gv > g->top)
96			g->top = gv;
97			}
98	greg	2.1	}
99	greg	2.3	if (g->right - g->left && g->top - g->bottom) {
100			ngly++;
101			wsum += g->right - g->left;
102			hsum += g->top - g->bottom;
103			}
104	greg	2.1	f->fg[gn] = g;
105			}
106			fclose(fp);
107	greg	2.3	if (ngly) {
108			f->mwidth = wsum / ngly;
109			f->mheight = hsum / ngly;
110			}
111	greg	2.1	f->next = fontlist;
112			return(fontlist = f);
113			nonint:
114			sprintf(errmsg, "non-integer in font file \"%s\"", pathname);
115			error(USER, errmsg);
116			fonterr:
117			sprintf(errmsg, "%s character (%d) in font file \"%s\"",
118			err, gn, pathname);
119			error(USER, errmsg);
120			memerr:
121			error(SYSTEM, "out of memory in fontglyph");
122			}
123	greg	2.2
124
125	greg	2.6	freefont(fname) /* free a font (free all if fname==NULL) */
126			char *fname;
127			{
128			FONT head;
129			register FONT fl, f;
130			register int i;
131
132			head.next = fontlist;
133			fl = &head;
134			while ((f = fl->next) != NULL)
135			if (fname == NULL \|\| !strcmp(fname, f->name)) {
136			fl->next = f->next;
137			for (i = 0; i < 256; i++)
138			if (f->fg[i] != NULL)
139			free((char *)f->fg[i]);
140			freestr(f->name);
141			free((char *)f);
142			} else
143			fl = f;
144			fontlist = head.next;
145			}
146
147
148	greg	2.2	int
149	greg	2.3	uniftext(sp, tp, f) /* uniformly space text line */
150	greg	2.5	register short sp; / returned character spacing */
151	greg	2.3	register char tp; / text line */
152			register FONT f; / font */
153			{
154			int linelen;
155
156			linelen = *sp++ = 0;
157			while (*tp)
158			if (f->fg[*tp++&0xff] == NULL)
159			*sp++ = 0;
160			else
161			linelen += *sp++ = 256;
162			return(linelen);
163			}
164
165
166			int
167	greg	2.2	squeeztext(sp, tp, f, cis) /* squeeze text line */
168			short sp; / returned character spacing */
169			char tp; / text line */
170			FONT f; / font */
171			int cis; /* intercharacter spacing */
172			{
173			int linelen;
174	greg	2.5	register GLYPH *gp;
175	greg	2.2
176	greg	2.8	linelen = 0;
177	greg	2.2	gp = NULL;
178			while (tp && (gp = f->fg[tp++&0xff]) == NULL)
179			*sp++ = 0;
180			cis /= 2;
181	greg	2.8	*sp = cis;
182	greg	2.2	while (gp != NULL) {
183			if (gp->nverts) { /* regular character */
184			linelen += *sp++ += cis - gp->left;
185			*sp = gp->right + cis;
186			} else { /* space */
187			linelen += *sp++;
188	greg	2.3	*sp = f->mwidth;
189	greg	2.2	}
190			gp = NULL;
191			while (tp && (gp = f->fg[tp++&0xff]) == NULL) {
192			linelen += *sp++;
193			*sp = 0;
194			}
195			}
196	greg	2.3	linelen += *sp += cis;
197	greg	2.2	return(linelen);
198			}
199
200
201	greg	2.3	int
202	greg	2.2	proptext(sp, tp, f, cis, nsi) /* space line proportionally */
203			short sp; / returned character spacing */
204			char tp; / text line */
205			FONT f; / font */
206			int cis; /* target intercharacter spacing */
207			int nsi; /* minimum number of spaces for indent */
208			{
209	greg	2.3	register char end, tab;
210			GLYPH *gp;
211			short *nsp;
212			int alen, len, width;
213			/* start by squeezing it */
214			squeeztext(sp, tp, f, cis);
215			/* now, realign spacing */
216	greg	2.7	width = *sp++;
217	greg	2.3	while (*tp) {
218	greg	2.7	len = alen = 0;
219	greg	2.3	nsp = sp;
220			for (end = tp; *end; end = tab) {
221			tab = end + 1;
222			alen += *nsp++;
223			if (f->fg[*end&0xff]) {
224			while ((gp = f->fg[*tab&0xff]) != NULL &&
225			gp->nverts == 0) { /* tab in */
226			alen += *nsp++;
227			tab++;
228			}
229			len += tab - end;
230			}
231	greg	2.4	if (nsi && tab - end > nsi)
232	greg	2.3	break;
233			}
234			len = f->mwidth + cis; / compute target length */
235			width += len;
236			len -= alen; /* necessary adjustment */
237			while (sp < nsp) {
238			alen = len/(nsp-sp);
239			*sp++ += alen;
240			len -= alen;
241			}
242			tp = tab;
243			}
244			return(width);
245	greg	2.2	}