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  *getlibpath();

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


FONT *
getfont(fname)                          /* return font fname */
char  *fname;
{
        FILE  *fp;
        char  *pathname, *err;
        unsigned  wsum, hsum, ngly;
        int  gn, ngv, 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 ((ngv = fgetval(fp, 'i', &gn)) != EOF) {  /* get each glyph */
                if (ngv == 0)
                        goto nonint;
                if (gn < 1 || gn > 255) {
                        err = "illegal";
                        goto fonterr;
                }
                if (f->fg[gn] != NULL) {
                        err = "duplicate";
                        goto fonterr;
                }
                if (fgetval(fp, 'i', &ngv) <= 0 || ngv < 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 (fgetval(fp, 'i', &gv) <= 0 || gv < 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++ = 255;
        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:	2.11
Committed:	Fri Jun 30 16:06:40 1995 UTC (28 years, 10 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.10:	+6 -12 lines
Log Message:	added comments to font file using new fgetval() routine
#	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	2.11	extern char *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			FILE *fp;
28			char pathname, err;
29	greg	2.3	unsigned wsum, hsum, ngly;
30	greg	2.11	int gn, ngv, gv;
31	greg	2.5	register GLYPH *g;
32	greg	2.1	GORD *gp;
33			register FONT *f;
34
35			for (f = fontlist; f != NULL; f = f->next)
36			if (!strcmp(f->name, fname))
37			return(f);
38			/* load the font file */
39	greg	2.9	if ((pathname = getpath(fname, getlibpath(), R_OK)) == NULL) {
40	greg	2.1	sprintf(errmsg, "cannot find font file \"%s\"", fname);
41			error(USER, errmsg);
42			}
43			f = (FONT *)calloc(1, sizeof(FONT));
44			if (f == NULL)
45			goto memerr;
46			f->name = savestr(fname);
47			if ((fp = fopen(pathname, "r")) == NULL) {
48			sprintf(errmsg, "cannot open font file \"%s\"",
49			pathname);
50			error(SYSTEM, errmsg);
51			}
52	greg	2.3	wsum = hsum = ngly = 0;
53	greg	2.11	while ((ngv = fgetval(fp, 'i', &gn)) != EOF) { /* get each glyph */
54			if (ngv == 0)
55	greg	2.1	goto nonint;
56	greg	2.3	if (gn < 1 \|\| gn > 255) {
57	greg	2.1	err = "illegal";
58			goto fonterr;
59			}
60			if (f->fg[gn] != NULL) {
61			err = "duplicate";
62			goto fonterr;
63			}
64	greg	2.11	if (fgetval(fp, 'i', &ngv) <= 0 \|\| ngv < 0 \|\| ngv > 32000) {
65	greg	2.1	err = "bad # vertices for";
66			goto fonterr;
67			}
68			g = galloc(ngv);
69			if (g == NULL)
70			goto memerr;
71			g->nverts = ngv;
72	greg	2.2	g->left = g->right = g->top = g->bottom = 128;
73	greg	2.1	ngv *= 2;
74			gp = gvlist(g);
75			while (ngv--) {
76	greg	2.11	if (fgetval(fp, 'i', &gv) <= 0 \|\| gv < 0 \|\| gv > 255) {
77	greg	2.1	err = "bad vertex for";
78			goto fonterr;
79			}
80			*gp++ = gv;
81	greg	2.2	if (ngv & 1) { /* follow x limits */
82			if (gv < g->left)
83			g->left = gv;
84			else if (gv > g->right)
85			g->right = gv;
86			} else { /* follow y limits */
87			if (gv < g->bottom)
88			g->bottom = gv;
89			else if (gv > g->top)
90			g->top = gv;
91			}
92	greg	2.1	}
93	greg	2.3	if (g->right - g->left && g->top - g->bottom) {
94			ngly++;
95			wsum += g->right - g->left;
96			hsum += g->top - g->bottom;
97			}
98	greg	2.1	f->fg[gn] = g;
99			}
100			fclose(fp);
101	greg	2.3	if (ngly) {
102			f->mwidth = wsum / ngly;
103			f->mheight = hsum / ngly;
104			}
105	greg	2.1	f->next = fontlist;
106			return(fontlist = f);
107			nonint:
108			sprintf(errmsg, "non-integer in font file \"%s\"", pathname);
109			error(USER, errmsg);
110			fonterr:
111			sprintf(errmsg, "%s character (%d) in font file \"%s\"",
112			err, gn, pathname);
113			error(USER, errmsg);
114			memerr:
115			error(SYSTEM, "out of memory in fontglyph");
116			}
117	greg	2.2
118
119	greg	2.6	freefont(fname) /* free a font (free all if fname==NULL) */
120			char *fname;
121			{
122			FONT head;
123			register FONT fl, f;
124			register int i;
125
126			head.next = fontlist;
127			fl = &head;
128			while ((f = fl->next) != NULL)
129			if (fname == NULL \|\| !strcmp(fname, f->name)) {
130			fl->next = f->next;
131			for (i = 0; i < 256; i++)
132			if (f->fg[i] != NULL)
133			free((char *)f->fg[i]);
134			freestr(f->name);
135			free((char *)f);
136			} else
137			fl = f;
138			fontlist = head.next;
139			}
140
141
142	greg	2.2	int
143	greg	2.3	uniftext(sp, tp, f) /* uniformly space text line */
144	greg	2.5	register short sp; / returned character spacing */
145	greg	2.3	register char tp; / text line */
146			register FONT f; / font */
147			{
148			int linelen;
149
150			linelen = *sp++ = 0;
151			while (*tp)
152			if (f->fg[*tp++&0xff] == NULL)
153			*sp++ = 0;
154			else
155	greg	2.10	linelen += *sp++ = 255;
156	greg	2.3	return(linelen);
157			}
158
159
160			int
161	greg	2.2	squeeztext(sp, tp, f, cis) /* squeeze text line */
162			short sp; / returned character spacing */
163			char tp; / text line */
164			FONT f; / font */
165			int cis; /* intercharacter spacing */
166			{
167			int linelen;
168	greg	2.5	register GLYPH *gp;
169	greg	2.2
170	greg	2.8	linelen = 0;
171	greg	2.2	gp = NULL;
172			while (tp && (gp = f->fg[tp++&0xff]) == NULL)
173			*sp++ = 0;
174			cis /= 2;
175	greg	2.8	*sp = cis;
176	greg	2.2	while (gp != NULL) {
177			if (gp->nverts) { /* regular character */
178			linelen += *sp++ += cis - gp->left;
179			*sp = gp->right + cis;
180			} else { /* space */
181			linelen += *sp++;
182	greg	2.3	*sp = f->mwidth;
183	greg	2.2	}
184			gp = NULL;
185			while (tp && (gp = f->fg[tp++&0xff]) == NULL) {
186			linelen += *sp++;
187			*sp = 0;
188			}
189			}
190	greg	2.3	linelen += *sp += cis;
191	greg	2.2	return(linelen);
192			}
193
194
195	greg	2.3	int
196	greg	2.2	proptext(sp, tp, f, cis, nsi) /* space line proportionally */
197			short sp; / returned character spacing */
198			char tp; / text line */
199			FONT f; / font */
200			int cis; /* target intercharacter spacing */
201			int nsi; /* minimum number of spaces for indent */
202			{
203	greg	2.3	register char end, tab;
204			GLYPH *gp;
205			short *nsp;
206			int alen, len, width;
207			/* start by squeezing it */
208			squeeztext(sp, tp, f, cis);
209			/* now, realign spacing */
210	greg	2.7	width = *sp++;
211	greg	2.3	while (*tp) {
212	greg	2.7	len = alen = 0;
213	greg	2.3	nsp = sp;
214			for (end = tp; *end; end = tab) {
215			tab = end + 1;
216			alen += *nsp++;
217			if (f->fg[*end&0xff]) {
218			while ((gp = f->fg[*tab&0xff]) != NULL &&
219			gp->nverts == 0) { /* tab in */
220			alen += *nsp++;
221			tab++;
222			}
223			len += tab - end;
224			}
225	greg	2.4	if (nsi && tab - end > nsi)
226	greg	2.3	break;
227			}
228			len = f->mwidth + cis; / compute target length */
229			width += len;
230			len -= alen; /* necessary adjustment */
231			while (sp < nsp) {
232			alen = len/(nsp-sp);
233			*sp++ += alen;
234			len -= alen;
235			}
236			tp = tab;
237			}
238			return(width);
239	greg	2.2	}