src/rt/text.c

/* Copyright (c) 1990 Regents of the University of California */

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

/*
 *  text.c - functions for text patterns and mixtures.
 *
 *     11/12/86
 */

#include  "ray.h"

#include  "otypes.h"

/*
 *      A text pattern is specified as the text (a file or line),
 *  the upper left anchor point, the right motion vector, the down
 *  motion vector, and the foreground and background brightness.
 *  For a file, the description is as follows:
 *
 *      modifier brighttext id
 *      2 fontfile textfile
 *      0
 *      11
 *              Ax Ay Az
 *              Rx Ry Rz
 *              Dx Dy Dz
 *              foreground background
 *
 *  For a single line, we use:
 *
 *      modifier brighttext id
 *      N+2 fontfile . This is a line with N words...
 *      0
 *      11
 *              Ax Ay Az
 *              Rx Ry Rz
 *              Dx Dy Dz
 *              foreground background
 *
 *  Colortext is identical, except colors are given rather than
 *  brightnesses.  Mixtext has foreground and background modifiers:
 *
 *      modifier mixtext id
 *      4+ foremod backmod fontfile text..
 *      0
 *      9
 *              Ax Ay Az
 *              Rx Ry Rz
 *              Dx Dy Dz
 */

#define  fndx(m)        ((m)->otype==MIX_TEXT ? 2 : 0)
#define  tndx(m)        ((m)->otype==MIX_TEXT ? 3 : 1)

extern char  *libpath;                  /* library search path */

typedef unsigned char  GLYPH;

typedef struct font {
        GLYPH  *fg[256];                /* font glyphs */
        char  *name;                    /* font file name */
        struct font  *next;             /* next font in list */
}  FONT;

extern char  *fgetword();

extern GLYPH  *getglyph();

extern FONT  *getfont();

static FONT  *fontlist = NULL;          /* our font list */


text(m, r)
register OBJREC  *m;
RAY  *r;
{
        double  v[3], y, x;
        int  col, lno;
        int  foreground;
        GLYPH  *g;
        register double  *ap;

        if (m->oargs.nsargs - tndx(m) < 1 ||
                        m->oargs.nfargs != (m->otype == PAT_BTEXT ? 11 :
                                        m->otype == PAT_CTEXT ? 15 : 9))
                objerror(m, USER, "bad # arguments");

                                /* first, discover position in text */
        ap = m->oargs.farg;
        if (r->rox != NULL)
                multp3(v, r->rop, r->rox->b.xfm);
        else
                VCOPY(v, r->rop);
        v[0] -= ap[0];
        v[1] -= ap[1];
        v[2] -= ap[2];
        col = x = DOT(v, ap+3) / DOT(ap+3, ap+3);
        lno = y = DOT(v, ap+6) / DOT(ap+6, ap+6);
        x -= col;
        y = (lno+1) - y;
                                /* get the font character, check it */
        if ((g = getglyph(m, lno, col)) == NULL)
                foreground = 0;
        else
                foreground = inglyph(x, y, g);
                                /* modify */
        if (m->otype == MIX_TEXT) {
                OBJECT  omod;
                char  *modname = m->oargs.sarg[foreground ? 0 : 1];
                if (!strcmp(modname, VOIDID))
                        omod = OVOID;
                else if ((omod = modifier(modname)) == OVOID) {
                        sprintf(errmsg, "undefined modifier \"%s\"", modname);
                        objerror(m, USER, errmsg);
                }
                raymixture(r, omod, OVOID, 1.0);
        } else if (m->otype == PAT_BTEXT) {
                if (foreground)
                        scalecolor(r->pcol, ap[9]);
                else
                        scalecolor(r->pcol, ap[10]);
        } else { /* PAT_CTEXT */
                COLOR  cval;
                if (foreground)
                        setcolor(cval, ap[9], ap[10], ap[11]);
                else
                        setcolor(cval, ap[12], ap[13], ap[14]);
                multcolor(r->pcol, cval);
        }
}


GLYPH *
getglyph(tm, lno, col)          /* get a glyph from a text description */
register OBJREC  *tm;
int  lno;
int  col;
{
        extern char  *strcpy(), *fgets();
        FILE  *fp;
        char  linbuf[512];
        register int  i;
        register char  **txt;
        register char  *s;

        if (lno < 0 || col < 0)
                return(NULL);
        if (tm->os == NULL) {
                txt = (char **)malloc(2*sizeof(char **));
                if (txt == NULL)
                        goto memerr;
                if (tm->oargs.nsargs - tndx(tm) > 1) {  /* single line */
                        s = linbuf;
                        for (i = tndx(tm)+1; i < tm->oargs.nsargs; i++) {
                                strcpy(s, tm->oargs.sarg[i]);
                                s += strlen(s);
                                *s++ = ' ';
                        }
                        *--s = '\0';
                        txt[0] = savqstr(linbuf);
                        txt[1] = NULL;
                } else {                                /* text file */
                        if ((s = getpath(tm->oargs.sarg[tndx(tm)],
                                        libpath, R_OK)) == NULL) {
                                sprintf(errmsg, "cannot find text file \"%s\"",
                                                tm->oargs.sarg[tndx(tm)]);
                                error(USER, errmsg);
                        }
                        if ((fp = fopen(s, "r")) == NULL) {
                                sprintf(errmsg, "cannot open text file \"%s\"",
                                                s);
                                error(SYSTEM, errmsg);
                        }
                        for (i=0; fgets(linbuf,sizeof(linbuf),fp)!=NULL; i++) {
                                s = linbuf + strlen(linbuf) - 1;
                                if (*s == '\n')
                                        *s = '\0';
                                txt=(char **)realloc(txt,(i+2)*sizeof(char **));
                                if (txt == NULL)
                                        goto memerr;
                                txt[i] = savqstr(linbuf);
                        }
                        txt[i] = NULL;
                        fclose(fp);
                }
                tm->os = (char *)txt;
        }
        txt = (char **)tm->os;
        for (i = 0; i < lno; i++)
                if (txt[i] == NULL)
                        break;
        if ((s = txt[i]) == NULL || col >= strlen(s))
                return(NULL);
        else
                return(getfont(tm->oargs.sarg[fndx(tm)])->fg[s[col]]);
memerr:
        error(SYSTEM, "out of memory in getglyph");
}


FONT *
getfont(fname)                          /* return font fname */
char  *fname;
{
        char  buf[16];
        FILE  *fp;
        char  *pathname, *err;
        int  gn, ngv, gv;
        register GLYPH  *g;
        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);
        }
        while (fgetword(buf,sizeof(buf),fp) != NULL) {  /* get each glyph */
                if (!isint(buf))
                        goto nonint;
                gn = atoi(buf);
                if (gn < 0 || 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 > 255) {
                        err = "bad # vertices for";
                        goto fonterr;
                }
                g = (GLYPH *)malloc((2*ngv+1)*sizeof(GLYPH));
                if (g == NULL)
                        goto memerr;
                f->fg[gn] = g;
                *g++ = ngv;
                ngv *= 2;
                while (ngv--) {
                        if (fgetword(buf,sizeof(buf),fp) == NULL ||
                                        !isint(buf) ||
                                        (gv = atoi(buf)) < 0 || gv > 255) {
                                err = "bad vertex for";
                                goto fonterr;
                        }
                        *g++ = gv;
                }
        }
        fclose(fp);
        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");
}


inglyph(x, y, gl)               /* (x,y) within font glyph gl? */
double  x, y;
GLYPH  *gl;
{
        int  n, ncross;
        int  xlb, ylb;
        register GLYPH  *p0, *p1;

        if (x < 0.0 || y < 0.0)
                return(0);
        x *= 256.0;                     /* get glyph coordinates */
        y *= 256.0;
        xlb = x + 0.5;
        ylb = y + 0.5;
        n = *gl++;                      /* get # of vertices */
        p0 = gl + 2*(n-1);              /* connect last to first */
        p1 = gl;
        ncross = 0;
                                        /* positive x axis cross test */
        while (n--) {
                if ((p0[1] > ylb) ^ (p1[1] > ylb))
                        if (p0[0] > xlb && p1[0] > xlb)
                                ncross++;
                        else if (p0[0] > xlb || p1[0] > xlb)
                                ncross += (p1[1] > p0[1]) ^
                                                ((p0[1]-y)*(p1[0]-x) >
                                                (p0[0]-x)*(p1[1]-y));
                p0 = p1;
                p1 += 2;
        }
        return(ncross & 01);
}
Revision:	1.6
Committed:	Mon Jul 22 13:02:27 1991 UTC (32 years, 9 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 1.5:	+15 -5 lines
Log Message:	got rid of scanf() calls
#	Content
1	/* Copyright (c) 1990 Regents of the University of California */
2
3	#ifndef lint
4	static char SCCSid[] = "$SunId$ LBL";
5	#endif
6
7	/*
8	* text.c - functions for text patterns and mixtures.
9	*
10	* 11/12/86
11	*/
12
13	#include "ray.h"
14
15	#include "otypes.h"
16
17	/*
18	* A text pattern is specified as the text (a file or line),
19	* the upper left anchor point, the right motion vector, the down
20	* motion vector, and the foreground and background brightness.
21	* For a file, the description is as follows:
22	*
23	* modifier brighttext id
24	* 2 fontfile textfile
25	* 0
26	* 11
27	* Ax Ay Az
28	* Rx Ry Rz
29	* Dx Dy Dz
30	* foreground background
31	*
32	* For a single line, we use:
33	*
34	* modifier brighttext id
35	* N+2 fontfile . This is a line with N words...
36	* 0
37	* 11
38	* Ax Ay Az
39	* Rx Ry Rz
40	* Dx Dy Dz
41	* foreground background
42	*
43	* Colortext is identical, except colors are given rather than
44	* brightnesses. Mixtext has foreground and background modifiers:
45	*
46	* modifier mixtext id
47	* 4+ foremod backmod fontfile text..
48	* 0
49	* 9
50	* Ax Ay Az
51	* Rx Ry Rz
52	* Dx Dy Dz
53	*/
54
55	#define fndx(m) ((m)->otype==MIX_TEXT ? 2 : 0)
56	#define tndx(m) ((m)->otype==MIX_TEXT ? 3 : 1)
57
58	extern char libpath; / library search path */
59
60	typedef unsigned char GLYPH;
61
62	typedef struct font {
63	GLYPH fg[256]; / font glyphs */
64	char name; / font file name */
65	struct font next; / next font in list */
66	} FONT;
67
68	extern char *fgetword();
69
70	extern GLYPH *getglyph();
71
72	extern FONT *getfont();
73
74	static FONT fontlist = NULL; / our font list */
75
76
77	text(m, r)
78	register OBJREC *m;
79	RAY *r;
80	{
81	double v[3], y, x;
82	int col, lno;
83	int foreground;
84	GLYPH *g;
85	register double *ap;
86
87	if (m->oargs.nsargs - tndx(m) < 1 \|\|
88	m->oargs.nfargs != (m->otype == PAT_BTEXT ? 11 :
89	m->otype == PAT_CTEXT ? 15 : 9))
90	objerror(m, USER, "bad # arguments");
91
92	/* first, discover position in text */
93	ap = m->oargs.farg;
94	if (r->rox != NULL)
95	multp3(v, r->rop, r->rox->b.xfm);
96	else
97	VCOPY(v, r->rop);
98	v[0] -= ap[0];
99	v[1] -= ap[1];
100	v[2] -= ap[2];
101	col = x = DOT(v, ap+3) / DOT(ap+3, ap+3);
102	lno = y = DOT(v, ap+6) / DOT(ap+6, ap+6);
103	x -= col;
104	y = (lno+1) - y;
105	/* get the font character, check it */
106	if ((g = getglyph(m, lno, col)) == NULL)
107	foreground = 0;
108	else
109	foreground = inglyph(x, y, g);
110	/* modify */
111	if (m->otype == MIX_TEXT) {
112	OBJECT omod;
113	char *modname = m->oargs.sarg[foreground ? 0 : 1];
114	if (!strcmp(modname, VOIDID))
115	omod = OVOID;
116	else if ((omod = modifier(modname)) == OVOID) {
117	sprintf(errmsg, "undefined modifier \"%s\"", modname);
118	objerror(m, USER, errmsg);
119	}
120	raymixture(r, omod, OVOID, 1.0);
121	} else if (m->otype == PAT_BTEXT) {
122	if (foreground)
123	scalecolor(r->pcol, ap[9]);
124	else
125	scalecolor(r->pcol, ap[10]);
126	} else { /* PAT_CTEXT */
127	COLOR cval;
128	if (foreground)
129	setcolor(cval, ap[9], ap[10], ap[11]);
130	else
131	setcolor(cval, ap[12], ap[13], ap[14]);
132	multcolor(r->pcol, cval);
133	}
134	}
135
136
137	GLYPH *
138	getglyph(tm, lno, col) /* get a glyph from a text description */
139	register OBJREC *tm;
140	int lno;
141	int col;
142	{
143	extern char strcpy(), fgets();
144	FILE *fp;
145	char linbuf[512];
146	register int i;
147	register char **txt;
148	register char *s;
149
150	if (lno < 0 \|\| col < 0)
151	return(NULL);
152	if (tm->os == NULL) {
153	txt = (char *)malloc(2sizeof(char **));
154	if (txt == NULL)
155	goto memerr;
156	if (tm->oargs.nsargs - tndx(tm) > 1) { /* single line */
157	s = linbuf;
158	for (i = tndx(tm)+1; i < tm->oargs.nsargs; i++) {
159	strcpy(s, tm->oargs.sarg[i]);
160	s += strlen(s);
161	*s++ = ' ';
162	}
163	*--s = '\0';
164	txt[0] = savqstr(linbuf);
165	txt[1] = NULL;
166	} else { /* text file */
167	if ((s = getpath(tm->oargs.sarg[tndx(tm)],
168	libpath, R_OK)) == NULL) {
169	sprintf(errmsg, "cannot find text file \"%s\"",
170	tm->oargs.sarg[tndx(tm)]);
171	error(USER, errmsg);
172	}
173	if ((fp = fopen(s, "r")) == NULL) {
174	sprintf(errmsg, "cannot open text file \"%s\"",
175	s);
176	error(SYSTEM, errmsg);
177	}
178	for (i=0; fgets(linbuf,sizeof(linbuf),fp)!=NULL; i++) {
179	s = linbuf + strlen(linbuf) - 1;
180	if (*s == '\n')
181	*s = '\0';
182	txt=(char *)realloc(txt,(i+2)sizeof(char **));
183	if (txt == NULL)
184	goto memerr;
185	txt[i] = savqstr(linbuf);
186	}
187	txt[i] = NULL;
188	fclose(fp);
189	}
190	tm->os = (char *)txt;
191	}
192	txt = (char **)tm->os;
193	for (i = 0; i < lno; i++)
194	if (txt[i] == NULL)
195	break;
196	if ((s = txt[i]) == NULL \|\| col >= strlen(s))
197	return(NULL);
198	else
199	return(getfont(tm->oargs.sarg[fndx(tm)])->fg[s[col]]);
200	memerr:
201	error(SYSTEM, "out of memory in getglyph");
202	}
203
204
205	FONT *
206	getfont(fname) /* return font fname */
207	char *fname;
208	{
209	char buf[16];
210	FILE *fp;
211	char pathname, err;
212	int gn, ngv, gv;
213	register GLYPH *g;
214	register FONT *f;
215
216	for (f = fontlist; f != NULL; f = f->next)
217	if (!strcmp(f->name, fname))
218	return(f);
219	/* load the font file */
220	if ((pathname = getpath(fname, libpath, R_OK)) == NULL) {
221	sprintf(errmsg, "cannot find font file \"%s\"", fname);
222	error(USER, errmsg);
223	}
224	f = (FONT *)calloc(1, sizeof(FONT));
225	if (f == NULL)
226	goto memerr;
227	f->name = savestr(fname);
228	if ((fp = fopen(pathname, "r")) == NULL) {
229	sprintf(errmsg, "cannot open font file \"%s\"",
230	pathname);
231	error(SYSTEM, errmsg);
232	}
233	while (fgetword(buf,sizeof(buf),fp) != NULL) { /* get each glyph */
234	if (!isint(buf))
235	goto nonint;
236	gn = atoi(buf);
237	if (gn < 0 \|\| gn > 255) {
238	err = "illegal";
239	goto fonterr;
240	}
241	if (f->fg[gn] != NULL) {
242	err = "duplicate";
243	goto fonterr;
244	}
245	if (fgetword(buf,sizeof(buf),fp) == NULL \|\| !isint(buf) \|\|
246	(ngv = atoi(buf)) < 0 \|\| ngv > 255) {
247	err = "bad # vertices for";
248	goto fonterr;
249	}
250	g = (GLYPH )malloc((2ngv+1)*sizeof(GLYPH));
251	if (g == NULL)
252	goto memerr;
253	f->fg[gn] = g;
254	*g++ = ngv;
255	ngv *= 2;
256	while (ngv--) {
257	if (fgetword(buf,sizeof(buf),fp) == NULL \|\|
258	!isint(buf) \|\|
259	(gv = atoi(buf)) < 0 \|\| gv > 255) {
260	err = "bad vertex for";
261	goto fonterr;
262	}
263	*g++ = gv;
264	}
265	}
266	fclose(fp);
267	f->next = fontlist;
268	return(fontlist = f);
269	nonint:
270	sprintf(errmsg, "non-integer in font file \"%s\"", pathname);
271	error(USER, errmsg);
272	fonterr:
273	sprintf(errmsg, "%s character (%d) in font file \"%s\"",
274	err, gn, pathname);
275	error(USER, errmsg);
276	memerr:
277	error(SYSTEM, "out of memory in fontglyph");
278	}
279
280
281	inglyph(x, y, gl) /* (x,y) within font glyph gl? */
282	double x, y;
283	GLYPH *gl;
284	{
285	int n, ncross;
286	int xlb, ylb;
287	register GLYPH p0, p1;
288
289	if (x < 0.0 \|\| y < 0.0)
290	return(0);
291	x = 256.0; / get glyph coordinates */
292	y *= 256.0;
293	xlb = x + 0.5;
294	ylb = y + 0.5;
295	n = gl++; / get # of vertices */
296	p0 = gl + 2(n-1); / connect last to first */
297	p1 = gl;
298	ncross = 0;
299	/* positive x axis cross test */
300	while (n--) {
301	if ((p0[1] > ylb) ^ (p1[1] > ylb))
302	if (p0[0] > xlb && p1[0] > xlb)
303	ncross++;
304	else if (p0[0] > xlb \|\| p1[0] > xlb)
305	ncross += (p1[1] > p0[1]) ^
306	((p0[1]-y)*(p1[0]-x) >
307	(p0[0]-x)*(p1[1]-y));
308	p0 = p1;
309	p1 += 2;
310	}
311	return(ncross & 01);
312	}