src/common/font.c

#ifndef lint
static const char       RCSid[] = "$Id: font.c,v 2.15 2003/06/07 12:50:20 schorsch Exp $";
#endif
/*
 * Polygonal font handling routines
 */

#include "copyright.h"

#include "standard.h"

#include "font.h"

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


int     retainfonts = 0;                /* retain loaded fonts? */

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)) {
                        f->nref++;
                        return(f);
                }
                                                /* load the font file */
        if ((pathname = getpath(fname, getrlibpath(), 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);
        f->nref = 1;
        if ((fp = fopen(pathname, "r")) == NULL) {
                sprintf(errmsg, "cannot open font file \"%s\"",
                                pathname);
                error(SYSTEM, errmsg);
        }
        wsum = hsum = ngly = 0;                 /* get each glyph */
        while ((ngv = fgetval(fp, 'i', (char *)&gn)) != EOF) {
                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', (char *)&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', (char *)&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");
        return NULL; /* pro forma return */
}


void
freefont(fnt)                   /* release a font (free all if NULL) */
FONT *fnt;
{
        FONT  head;
        register FONT  *fl, *f;
        register int  i;
                                        /* check reference count */
        if (fnt != NULL && ((fnt->nref-- > 1) | retainfonts))
                return;
        head.next = fontlist;
        fl = &head;
        while ((f = fl->next) != NULL)
                if ((fnt == NULL) | (fnt == f)) {
                        fl->next = f->next;
                        for (i = 0; i < 256; i++)
                                if (f->fg[i] != NULL)
                                        free((void *)f->fg[i]);
                        freestr(f->name);
                        free((void *)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:	2.16
Committed:	Sun Jul 27 22:12:01 2003 UTC (22 years, 3 months ago) by schorsch
Content type:	text/plain
Branch:	MAIN
Changes since 2.15:	+3 -3 lines
Log Message:	Added grouping parens to reduce ambiguity warnings.
#	User	Rev	Content
1	greg	2.1	#ifndef lint
2	schorsch	2.16	static const char RCSid[] = "$Id: font.c,v 2.15 2003/06/07 12:50:20 schorsch Exp $";
3	greg	2.1	#endif
4			/*
5			* Polygonal font handling routines
6			*/
7
8	greg	2.13	#include "copyright.h"
9	greg	2.12
10	greg	2.1	#include "standard.h"
11
12			#include "font.h"
13
14			#define galloc(nv) (GLYPH )malloc(sizeof(GLYPH)+2sizeof(GORD)*(nv))
15
16
17	greg	2.12	int retainfonts = 0; /* retain loaded fonts? */
18	greg	2.1
19			static FONT fontlist = NULL; / list of loaded fonts */
20
21
22			FONT *
23			getfont(fname) /* return font fname */
24			char *fname;
25			{
26			FILE *fp;
27			char pathname, err;
28	greg	2.3	unsigned wsum, hsum, ngly;
29	greg	2.11	int gn, ngv, gv;
30	greg	2.5	register GLYPH *g;
31	greg	2.1	GORD *gp;
32			register FONT *f;
33
34			for (f = fontlist; f != NULL; f = f->next)
35	greg	2.12	if (!strcmp(f->name, fname)) {
36			f->nref++;
37	greg	2.1	return(f);
38	greg	2.12	}
39	greg	2.1	/* load the font file */
40	greg	2.14	if ((pathname = getpath(fname, getrlibpath(), R_OK)) == NULL) {
41	greg	2.1	sprintf(errmsg, "cannot find font file \"%s\"", fname);
42			error(USER, errmsg);
43			}
44			f = (FONT *)calloc(1, sizeof(FONT));
45			if (f == NULL)
46			goto memerr;
47			f->name = savestr(fname);
48	greg	2.12	f->nref = 1;
49	greg	2.1	if ((fp = fopen(pathname, "r")) == NULL) {
50			sprintf(errmsg, "cannot open font file \"%s\"",
51			pathname);
52			error(SYSTEM, errmsg);
53			}
54	greg	2.12	wsum = hsum = ngly = 0; /* get each glyph */
55			while ((ngv = fgetval(fp, 'i', (char *)&gn)) != EOF) {
56	greg	2.11	if (ngv == 0)
57	greg	2.1	goto nonint;
58	greg	2.3	if (gn < 1 \|\| gn > 255) {
59	greg	2.1	err = "illegal";
60			goto fonterr;
61			}
62			if (f->fg[gn] != NULL) {
63			err = "duplicate";
64			goto fonterr;
65			}
66	greg	2.12	if (fgetval(fp, 'i', (char *)&ngv) <= 0 \|\|
67			ngv < 0 \|\| ngv > 32000) {
68	greg	2.1	err = "bad # vertices for";
69			goto fonterr;
70			}
71			g = galloc(ngv);
72			if (g == NULL)
73			goto memerr;
74			g->nverts = ngv;
75	greg	2.2	g->left = g->right = g->top = g->bottom = 128;
76	greg	2.1	ngv *= 2;
77			gp = gvlist(g);
78			while (ngv--) {
79	greg	2.12	if (fgetval(fp, 'i', (char *)&gv) <= 0 \|\|
80			gv < 0 \|\| gv > 255) {
81	greg	2.1	err = "bad vertex for";
82			goto fonterr;
83			}
84			*gp++ = gv;
85	greg	2.2	if (ngv & 1) { /* follow x limits */
86			if (gv < g->left)
87			g->left = gv;
88			else if (gv > g->right)
89			g->right = gv;
90			} else { /* follow y limits */
91			if (gv < g->bottom)
92			g->bottom = gv;
93			else if (gv > g->top)
94			g->top = gv;
95			}
96	greg	2.1	}
97	greg	2.3	if (g->right - g->left && g->top - g->bottom) {
98			ngly++;
99			wsum += g->right - g->left;
100			hsum += g->top - g->bottom;
101			}
102	greg	2.1	f->fg[gn] = g;
103			}
104			fclose(fp);
105	greg	2.3	if (ngly) {
106			f->mwidth = wsum / ngly;
107			f->mheight = hsum / ngly;
108			}
109	greg	2.1	f->next = fontlist;
110			return(fontlist = f);
111			nonint:
112			sprintf(errmsg, "non-integer in font file \"%s\"", pathname);
113			error(USER, errmsg);
114			fonterr:
115			sprintf(errmsg, "%s character (%d) in font file \"%s\"",
116			err, gn, pathname);
117			error(USER, errmsg);
118			memerr:
119			error(SYSTEM, "out of memory in fontglyph");
120	schorsch	2.15	return NULL; /* pro forma return */
121	greg	2.1	}
122	greg	2.2
123
124	greg	2.12	void
125			freefont(fnt) /* release a font (free all if NULL) */
126			FONT *fnt;
127	greg	2.6	{
128			FONT head;
129			register FONT fl, f;
130			register int i;
131	greg	2.12	/* check reference count */
132	schorsch	2.16	if (fnt != NULL && ((fnt->nref-- > 1) \| retainfonts))
133	greg	2.12	return;
134	greg	2.6	head.next = fontlist;
135			fl = &head;
136			while ((f = fl->next) != NULL)
137	schorsch	2.16	if ((fnt == NULL) \| (fnt == f)) {
138	greg	2.6	fl->next = f->next;
139			for (i = 0; i < 256; i++)
140			if (f->fg[i] != NULL)
141	greg	2.12	free((void *)f->fg[i]);
142	greg	2.6	freestr(f->name);
143	greg	2.12	free((void *)f);
144	greg	2.6	} 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	greg	2.10	linelen += *sp++ = 255;
164	greg	2.3	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	greg	2.8	linelen = 0;
179	greg	2.2	gp = NULL;
180			while (tp && (gp = f->fg[tp++&0xff]) == NULL)
181			*sp++ = 0;
182			cis /= 2;
183	greg	2.8	*sp = cis;
184	greg	2.2	while (gp != NULL) {
185			if (gp->nverts) { /* regular character */
186			linelen += *sp++ += cis - gp->left;
187			*sp = gp->right + cis;
188			} else { /* space */
189			linelen += *sp++;
190	greg	2.3	*sp = f->mwidth;
191	greg	2.2	}
192			gp = NULL;
193			while (tp && (gp = f->fg[tp++&0xff]) == NULL) {
194			linelen += *sp++;
195			*sp = 0;
196			}
197			}
198	greg	2.3	linelen += *sp += cis;
199	greg	2.2	return(linelen);
200			}
201
202
203	greg	2.3	int
204	greg	2.2	proptext(sp, tp, f, cis, nsi) /* space line proportionally */
205			short sp; / returned character spacing */
206			char tp; / text line */
207			FONT f; / font */
208			int cis; /* target intercharacter spacing */
209			int nsi; /* minimum number of spaces for indent */
210			{
211	greg	2.3	register char end, tab;
212			GLYPH *gp;
213			short *nsp;
214			int alen, len, width;
215			/* start by squeezing it */
216			squeeztext(sp, tp, f, cis);
217			/* now, realign spacing */
218	greg	2.7	width = *sp++;
219	greg	2.3	while (*tp) {
220	greg	2.7	len = alen = 0;
221	greg	2.3	nsp = sp;
222			for (end = tp; *end; end = tab) {
223			tab = end + 1;
224			alen += *nsp++;
225			if (f->fg[*end&0xff]) {
226			while ((gp = f->fg[*tab&0xff]) != NULL &&
227			gp->nverts == 0) { /* tab in */
228			alen += *nsp++;
229			tab++;
230			}
231			len += tab - end;
232			}
233	greg	2.4	if (nsi && tab - end > nsi)
234	greg	2.3	break;
235			}
236			len = f->mwidth + cis; / compute target length */
237			width += len;
238			len -= alen; /* necessary adjustment */
239			while (sp < nsp) {
240			alen = len/(nsp-sp);
241			*sp++ += alen;
242			len -= alen;
243			}
244			tp = tab;
245			}
246			return(width);
247	greg	2.2	}