src/common/font.c

#ifndef lint
static const char       RCSid[] = "$Id: font.c,v 2.17 2003/11/14 17:22:06 schorsch Exp $";
#endif
/*
 * Polygonal font handling routines
 */

#include "copyright.h"

#include <stdlib.h>

#include "rtio.h"
#include "rterror.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 = NULL;
        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 = NULL;
        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:	2.18
Committed:	Fri Mar 26 21:29:19 2004 UTC (20 years, 1 month ago) by schorsch
Content type:	text/plain
Branch:	MAIN
Changes since 2.17:	+3 -1 lines
Log Message:	Small fixes to reduce warnings. Added bmpfile.c to SConscript.
#	User	Rev	Content
1	greg	2.1	#ifndef lint
2	schorsch	2.18	static const char RCSid[] = "$Id: font.c,v 2.17 2003/11/14 17:22:06 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	schorsch	2.18	#include <stdlib.h>
11
12	schorsch	2.17	#include "rtio.h"
13			#include "rterror.h"
14	greg	2.1	#include "font.h"
15
16			#define galloc(nv) (GLYPH )malloc(sizeof(GLYPH)+2sizeof(GORD)*(nv))
17
18
19	greg	2.12	int retainfonts = 0; /* retain loaded fonts? */
20	greg	2.1
21			static FONT fontlist = NULL; / list of loaded fonts */
22
23
24			FONT *
25			getfont(fname) /* return font fname */
26			char *fname;
27			{
28			FILE *fp;
29	schorsch	2.17	char pathname, err = NULL;
30	greg	2.3	unsigned wsum, hsum, ngly;
31	greg	2.11	int gn, ngv, gv;
32	greg	2.5	register GLYPH *g;
33	greg	2.1	GORD *gp;
34			register FONT *f;
35
36			for (f = fontlist; f != NULL; f = f->next)
37	greg	2.12	if (!strcmp(f->name, fname)) {
38			f->nref++;
39	greg	2.1	return(f);
40	greg	2.12	}
41	greg	2.1	/* load the font file */
42	greg	2.14	if ((pathname = getpath(fname, getrlibpath(), R_OK)) == NULL) {
43	greg	2.1	sprintf(errmsg, "cannot find font file \"%s\"", fname);
44			error(USER, errmsg);
45			}
46			f = (FONT *)calloc(1, sizeof(FONT));
47			if (f == NULL)
48			goto memerr;
49			f->name = savestr(fname);
50	greg	2.12	f->nref = 1;
51	greg	2.1	if ((fp = fopen(pathname, "r")) == NULL) {
52			sprintf(errmsg, "cannot open font file \"%s\"",
53			pathname);
54			error(SYSTEM, errmsg);
55			}
56	greg	2.12	wsum = hsum = ngly = 0; /* get each glyph */
57			while ((ngv = fgetval(fp, 'i', (char *)&gn)) != EOF) {
58	greg	2.11	if (ngv == 0)
59	greg	2.1	goto nonint;
60	greg	2.3	if (gn < 1 \|\| gn > 255) {
61	greg	2.1	err = "illegal";
62			goto fonterr;
63			}
64			if (f->fg[gn] != NULL) {
65			err = "duplicate";
66			goto fonterr;
67			}
68	greg	2.12	if (fgetval(fp, 'i', (char *)&ngv) <= 0 \|\|
69			ngv < 0 \|\| ngv > 32000) {
70	greg	2.1	err = "bad # vertices for";
71			goto fonterr;
72			}
73			g = galloc(ngv);
74			if (g == NULL)
75			goto memerr;
76			g->nverts = ngv;
77	greg	2.2	g->left = g->right = g->top = g->bottom = 128;
78	greg	2.1	ngv *= 2;
79			gp = gvlist(g);
80			while (ngv--) {
81	greg	2.12	if (fgetval(fp, 'i', (char *)&gv) <= 0 \|\|
82			gv < 0 \|\| gv > 255) {
83	greg	2.1	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	schorsch	2.15	return NULL; /* pro forma return */
123	greg	2.1	}
124	greg	2.2
125
126	greg	2.12	void
127			freefont(fnt) /* release a font (free all if NULL) */
128			FONT *fnt;
129	greg	2.6	{
130			FONT head;
131			register FONT fl, f;
132			register int i;
133	greg	2.12	/* check reference count */
134	schorsch	2.16	if (fnt != NULL && ((fnt->nref-- > 1) \| retainfonts))
135	greg	2.12	return;
136	greg	2.6	head.next = fontlist;
137			fl = &head;
138			while ((f = fl->next) != NULL)
139	schorsch	2.16	if ((fnt == NULL) \| (fnt == f)) {
140	greg	2.6	fl->next = f->next;
141			for (i = 0; i < 256; i++)
142			if (f->fg[i] != NULL)
143	greg	2.12	free((void *)f->fg[i]);
144	greg	2.6	freestr(f->name);
145	greg	2.12	free((void *)f);
146	greg	2.6	} else
147			fl = f;
148			fontlist = head.next;
149			}
150
151
152	greg	2.2	int
153	greg	2.3	uniftext(sp, tp, f) /* uniformly space text line */
154	greg	2.5	register short sp; / returned character spacing */
155	greg	2.3	register char tp; / text line */
156			register FONT f; / font */
157			{
158			int linelen;
159
160			linelen = *sp++ = 0;
161			while (*tp)
162			if (f->fg[*tp++&0xff] == NULL)
163			*sp++ = 0;
164			else
165	greg	2.10	linelen += *sp++ = 255;
166	greg	2.3	return(linelen);
167			}
168
169
170			int
171	greg	2.2	squeeztext(sp, tp, f, cis) /* squeeze text line */
172			short sp; / returned character spacing */
173			char tp; / text line */
174			FONT f; / font */
175			int cis; /* intercharacter spacing */
176			{
177			int linelen;
178	greg	2.5	register GLYPH *gp;
179	greg	2.2
180	greg	2.8	linelen = 0;
181	greg	2.2	gp = NULL;
182			while (tp && (gp = f->fg[tp++&0xff]) == NULL)
183			*sp++ = 0;
184			cis /= 2;
185	greg	2.8	*sp = cis;
186	greg	2.2	while (gp != NULL) {
187			if (gp->nverts) { /* regular character */
188			linelen += *sp++ += cis - gp->left;
189			*sp = gp->right + cis;
190			} else { /* space */
191			linelen += *sp++;
192	greg	2.3	*sp = f->mwidth;
193	greg	2.2	}
194			gp = NULL;
195			while (tp && (gp = f->fg[tp++&0xff]) == NULL) {
196			linelen += *sp++;
197			*sp = 0;
198			}
199			}
200	greg	2.3	linelen += *sp += cis;
201	greg	2.2	return(linelen);
202			}
203
204
205	greg	2.3	int
206	greg	2.2	proptext(sp, tp, f, cis, nsi) /* space line proportionally */
207			short sp; / returned character spacing */
208			char tp; / text line */
209			FONT f; / font */
210			int cis; /* target intercharacter spacing */
211			int nsi; /* minimum number of spaces for indent */
212			{
213	schorsch	2.17	register char end, tab = NULL;
214	greg	2.3	GLYPH *gp;
215			short *nsp;
216			int alen, len, width;
217			/* start by squeezing it */
218			squeeztext(sp, tp, f, cis);
219			/* now, realign spacing */
220	greg	2.7	width = *sp++;
221	greg	2.3	while (*tp) {
222	greg	2.7	len = alen = 0;
223	greg	2.3	nsp = sp;
224			for (end = tp; *end; end = tab) {
225			tab = end + 1;
226			alen += *nsp++;
227			if (f->fg[*end&0xff]) {
228			while ((gp = f->fg[*tab&0xff]) != NULL &&
229			gp->nverts == 0) { /* tab in */
230			alen += *nsp++;
231			tab++;
232			}
233			len += tab - end;
234			}
235	greg	2.4	if (nsi && tab - end > nsi)
236	greg	2.3	break;
237			}
238			len = f->mwidth + cis; / compute target length */
239			width += len;
240			len -= alen; /* necessary adjustment */
241			while (sp < nsp) {
242			alen = len/(nsp-sp);
243			*sp++ += alen;
244			len -= alen;
245			}
246			tp = tab;
247			}
248			return(width);
249	greg	2.2	}