src/rt/text.c

/* Copyright (c) 1991 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;

typedef struct {
        char  **t;                      /* text array */
        FVECT  right, down;             /* right and down unit vectors */
        FONT  *f;                       /* our font */
}  TEXT;

extern char  *fgetword();

TEXT  *gettext();

FONT  *getfont();

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


text(m, r)
register OBJREC  *m;
RAY  *r;
{
        double  v[3];
        int  foreground;
                                /* get transformed position */
        if (r->rox != NULL)
                multp3(v, r->rop, r->rox->b.xfm);
        else
                VCOPY(v, r->rop);
                                /* check if we are within a text glyph */
        foreground = intext(v, m);
                                /* 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);
                }
                raytexture(r, omod);
        } else if (m->otype == PAT_BTEXT) {
                if (foreground)
                        scalecolor(r->pcol, m->oargs.farg[9]);
                else
                        scalecolor(r->pcol, m->oargs.farg[10]);
        } else { /* PAT_CTEXT */
                COLOR  cval;
                if (foreground)
                        setcolor(cval, m->oargs.farg[9],
                                        m->oargs.farg[10],
                                        m->oargs.farg[11]);
                else
                        setcolor(cval, m->oargs.farg[12],
                                        m->oargs.farg[13],
                                        m->oargs.farg[14]);
                multcolor(r->pcol, cval);
        }
}


TEXT *
gettext(tm)                     /* get text structure for material */
register OBJREC  *tm;
{
#define  R      (tm->oargs.farg+3)
#define  D      (tm->oargs.farg+6)
        extern char  *strcpy(), *fgets();
        FVECT  DxR;
        double  d;
        FILE  *fp;
        char  linbuf[512];
        register TEXT  *t;
        register int  i;
        register char  *s;

        if ((t = (TEXT *)tm->os) != NULL)
                return(t);
                                                /* check arguments */
        if (tm->oargs.nsargs - tndx(tm) < 1 ||
                        tm->oargs.nfargs != (tm->otype == PAT_BTEXT ? 11 :
                                        tm->otype == PAT_CTEXT ? 15 : 9))
                objerror(tm, USER, "bad # arguments");
        if ((t = (TEXT *)malloc(sizeof(TEXT))) == NULL)
                goto memerr;
                                                /* compute vectors */
        fcross(DxR, D, R);
        fcross(t->right, DxR, D);
        d = DOT(D,D) / DOT(t->right,t->right);
        for (i = 0; i < 3; i++)
                t->right[i] *= d;
        fcross(t->down, R, DxR);
        d = DOT(R,R) / DOT(t->down,t->down);
        for (i = 0; i < 3; i++)
                t->down[i] *= d;
                                                /* get text */
        t->t = (char **)malloc(2*sizeof(char **));
        if (t->t == 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';
                t->t[0] = savqstr(linbuf);
                t->t[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';
                        t->t=(char **)realloc((char *)t->t,
                                        (i+2)*sizeof(char **));
                        if (t->t == NULL)
                                goto memerr;
                        t->t[i] = savqstr(linbuf);
                }
                t->t[i] = NULL;
                fclose(fp);
        }
                                                /* get the font */
        t->f = getfont(tm->oargs.sarg[fndx(tm)]);
                                                /* we're done */
        tm->os = (char *)t;
        return(t);
memerr:
        error(SYSTEM, "out of memory in gettext");
#undef  R
#undef  D
}


freetext(m)                     /* free text structures associated with m */
OBJREC  *m;
{
        register TEXT  *tp;
        register int  i;

        tp = (TEXT *)m->os;
        if (tp == NULL)
                return;
        for (i = 0; tp->t[i] != NULL; i++)
                freeqstr(tp->t[i]);
        free((char *)tp->t);
        free((char *)tp);
        m->os = NULL;
}


intext(p, m)                    /* check to see if p is in text glyph */
FVECT  p;
register OBJREC  *m;
{
        register TEXT  *tp;
        register int  i;
        double  v[3], y, x;
        int  col, lno;
                                /* first, compute position in text */
        v[0] = p[0] - m->oargs.farg[0];
        v[1] = p[1] - m->oargs.farg[1];
        v[2] = p[2] - m->oargs.farg[2];
        col = x = DOT(v, tp->right);
        lno = y = DOT(v, tp->down);
        if (x < 0.0 || y < 0.0)
                return(0);
        x -= (double)col;
        y = (lno+1) - y;
                                /* get the font character */
        tp = gettext(m);
        for (i = 0; i < lno; i++)
                if (tp->t[i] == NULL)
                        return(0);
        if (col >= strlen(tp->t[i]))
                return(0);
        return(inglyph(x, y, tp->f->fg[tp->t[i][col]]));
}


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 (gl == NULL)
                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:	1.7
Committed:	Mon Aug 5 09:32:12 1991 UTC (34 years, 3 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 1.6:	+140 -87 lines
Log Message:	fixed long-standing bug in slanted text
#	User	Rev	Content
1	greg	1.7	/* Copyright (c) 1991 Regents of the University of California */
2	greg	1.1
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	greg	1.7	typedef struct {
69			char *t; / text array */
70			FVECT right, down; /* right and down unit vectors */
71			FONT f; / our font */
72			} TEXT;
73
74	greg	1.6	extern char *fgetword();
75
76	greg	1.7	TEXT *gettext();
77	greg	1.1
78	greg	1.7	FONT *getfont();
79	greg	1.1
80			static FONT fontlist = NULL; / our font list */
81
82
83			text(m, r)
84			register OBJREC *m;
85			RAY *r;
86			{
87	greg	1.7	double v[3];
88	greg	1.1	int foreground;
89	greg	1.7	/* get transformed position */
90	greg	1.4	if (r->rox != NULL)
91			multp3(v, r->rop, r->rox->b.xfm);
92			else
93			VCOPY(v, r->rop);
94	greg	1.7	/* check if we are within a text glyph */
95			foreground = intext(v, m);
96	greg	1.1	/* modify */
97			if (m->otype == MIX_TEXT) {
98			OBJECT omod;
99			char *modname = m->oargs.sarg[foreground ? 0 : 1];
100			if (!strcmp(modname, VOIDID))
101			omod = OVOID;
102			else if ((omod = modifier(modname)) == OVOID) {
103			sprintf(errmsg, "undefined modifier \"%s\"", modname);
104			objerror(m, USER, errmsg);
105			}
106	greg	1.7	raytexture(r, omod);
107	greg	1.1	} else if (m->otype == PAT_BTEXT) {
108			if (foreground)
109	greg	1.7	scalecolor(r->pcol, m->oargs.farg[9]);
110	greg	1.1	else
111	greg	1.7	scalecolor(r->pcol, m->oargs.farg[10]);
112	greg	1.1	} else { /* PAT_CTEXT */
113			COLOR cval;
114			if (foreground)
115	greg	1.7	setcolor(cval, m->oargs.farg[9],
116			m->oargs.farg[10],
117			m->oargs.farg[11]);
118	greg	1.1	else
119	greg	1.7	setcolor(cval, m->oargs.farg[12],
120			m->oargs.farg[13],
121			m->oargs.farg[14]);
122	greg	1.1	multcolor(r->pcol, cval);
123			}
124			}
125
126
127	greg	1.7	TEXT *
128			gettext(tm) /* get text structure for material */
129	greg	1.1	register OBJREC *tm;
130			{
131	greg	1.7	#define R (tm->oargs.farg+3)
132			#define D (tm->oargs.farg+6)
133	greg	1.1	extern char strcpy(), fgets();
134	greg	1.7	FVECT DxR;
135			double d;
136	greg	1.1	FILE *fp;
137			char linbuf[512];
138	greg	1.7	register TEXT *t;
139	greg	1.1	register int i;
140			register char *s;
141
142	greg	1.7	if ((t = (TEXT *)tm->os) != NULL)
143			return(t);
144			/* check arguments */
145			if (tm->oargs.nsargs - tndx(tm) < 1 \|\|
146			tm->oargs.nfargs != (tm->otype == PAT_BTEXT ? 11 :
147			tm->otype == PAT_CTEXT ? 15 : 9))
148			objerror(tm, USER, "bad # arguments");
149			if ((t = (TEXT *)malloc(sizeof(TEXT))) == NULL)
150			goto memerr;
151			/* compute vectors */
152			fcross(DxR, D, R);
153			fcross(t->right, DxR, D);
154			d = DOT(D,D) / DOT(t->right,t->right);
155			for (i = 0; i < 3; i++)
156			t->right[i] *= d;
157			fcross(t->down, R, DxR);
158			d = DOT(R,R) / DOT(t->down,t->down);
159			for (i = 0; i < 3; i++)
160			t->down[i] *= d;
161			/* get text */
162			t->t = (char *)malloc(2sizeof(char **));
163			if (t->t == NULL)
164			goto memerr;
165			if (tm->oargs.nsargs - tndx(tm) > 1) { /* single line */
166			s = linbuf;
167			for (i = tndx(tm)+1; i < tm->oargs.nsargs; i++) {
168			strcpy(s, tm->oargs.sarg[i]);
169			s += strlen(s);
170			*s++ = ' ';
171	greg	1.1	}
172	greg	1.7	*--s = '\0';
173			t->t[0] = savqstr(linbuf);
174			t->t[1] = NULL;
175			} else { /* text file */
176			if ((s = getpath(tm->oargs.sarg[tndx(tm)],
177			libpath, R_OK)) == NULL) {
178			sprintf(errmsg, "cannot find text file \"%s\"",
179			tm->oargs.sarg[tndx(tm)]);
180			error(USER, errmsg);
181			}
182			if ((fp = fopen(s, "r")) == NULL) {
183			sprintf(errmsg, "cannot open text file \"%s\"",
184			s);
185			error(SYSTEM, errmsg);
186			}
187			for (i=0; fgets(linbuf,sizeof(linbuf),fp)!=NULL; i++) {
188			s = linbuf + strlen(linbuf) - 1;
189			if (*s == '\n')
190			*s = '\0';
191			t->t=(char *)realloc((char )t->t,
192			(i+2)sizeof(char *));
193			if (t->t == NULL)
194			goto memerr;
195			t->t[i] = savqstr(linbuf);
196			}
197			t->t[i] = NULL;
198			fclose(fp);
199	greg	1.1	}
200	greg	1.7	/* get the font */
201			t->f = getfont(tm->oargs.sarg[fndx(tm)]);
202			/* we're done */
203			tm->os = (char *)t;
204			return(t);
205	greg	1.1	memerr:
206	greg	1.7	error(SYSTEM, "out of memory in gettext");
207			#undef R
208			#undef D
209	greg	1.1	}
210
211
212	greg	1.7	freetext(m) /* free text structures associated with m */
213			OBJREC *m;
214			{
215			register TEXT *tp;
216			register int i;
217
218			tp = (TEXT *)m->os;
219			if (tp == NULL)
220			return;
221			for (i = 0; tp->t[i] != NULL; i++)
222			freeqstr(tp->t[i]);
223			free((char *)tp->t);
224			free((char *)tp);
225			m->os = NULL;
226			}
227
228
229			intext(p, m) /* check to see if p is in text glyph */
230			FVECT p;
231			register OBJREC *m;
232			{
233			register TEXT *tp;
234			register int i;
235			double v[3], y, x;
236			int col, lno;
237			/* first, compute position in text */
238			v[0] = p[0] - m->oargs.farg[0];
239			v[1] = p[1] - m->oargs.farg[1];
240			v[2] = p[2] - m->oargs.farg[2];
241			col = x = DOT(v, tp->right);
242			lno = y = DOT(v, tp->down);
243			if (x < 0.0 \|\| y < 0.0)
244			return(0);
245			x -= (double)col;
246			y = (lno+1) - y;
247			/* get the font character */
248			tp = gettext(m);
249			for (i = 0; i < lno; i++)
250			if (tp->t[i] == NULL)
251			return(0);
252			if (col >= strlen(tp->t[i]))
253			return(0);
254			return(inglyph(x, y, tp->f->fg[tp->t[i][col]]));
255			}
256
257
258	greg	1.1	FONT *
259			getfont(fname) /* return font fname */
260			char *fname;
261			{
262	greg	1.6	char buf[16];
263	greg	1.1	FILE *fp;
264			char pathname, err;
265			int gn, ngv, gv;
266			register GLYPH *g;
267			register FONT *f;
268
269			for (f = fontlist; f != NULL; f = f->next)
270			if (!strcmp(f->name, fname))
271			return(f);
272			/* load the font file */
273	greg	1.3	if ((pathname = getpath(fname, libpath, R_OK)) == NULL) {
274	greg	1.1	sprintf(errmsg, "cannot find font file \"%s\"", fname);
275			error(USER, errmsg);
276			}
277			f = (FONT *)calloc(1, sizeof(FONT));
278			if (f == NULL)
279			goto memerr;
280			f->name = savestr(fname);
281			if ((fp = fopen(pathname, "r")) == NULL) {
282			sprintf(errmsg, "cannot open font file \"%s\"",
283			pathname);
284			error(SYSTEM, errmsg);
285			}
286	greg	1.6	while (fgetword(buf,sizeof(buf),fp) != NULL) { /* get each glyph */
287			if (!isint(buf))
288			goto nonint;
289			gn = atoi(buf);
290	greg	1.1	if (gn < 0 \|\| gn > 255) {
291			err = "illegal";
292			goto fonterr;
293			}
294			if (f->fg[gn] != NULL) {
295			err = "duplicate";
296			goto fonterr;
297			}
298	greg	1.6	if (fgetword(buf,sizeof(buf),fp) == NULL \|\| !isint(buf) \|\|
299			(ngv = atoi(buf)) < 0 \|\| ngv > 255) {
300	greg	1.1	err = "bad # vertices for";
301			goto fonterr;
302			}
303			g = (GLYPH )malloc((2ngv+1)*sizeof(GLYPH));
304			if (g == NULL)
305			goto memerr;
306			f->fg[gn] = g;
307			*g++ = ngv;
308			ngv *= 2;
309			while (ngv--) {
310	greg	1.6	if (fgetword(buf,sizeof(buf),fp) == NULL \|\|
311			!isint(buf) \|\|
312			(gv = atoi(buf)) < 0 \|\| gv > 255) {
313	greg	1.1	err = "bad vertex for";
314			goto fonterr;
315			}
316			*g++ = gv;
317			}
318			}
319			fclose(fp);
320			f->next = fontlist;
321			return(fontlist = f);
322	greg	1.6	nonint:
323			sprintf(errmsg, "non-integer in font file \"%s\"", pathname);
324			error(USER, errmsg);
325	greg	1.1	fonterr:
326			sprintf(errmsg, "%s character (%d) in font file \"%s\"",
327			err, gn, pathname);
328			error(USER, errmsg);
329			memerr:
330			error(SYSTEM, "out of memory in fontglyph");
331			}
332
333
334			inglyph(x, y, gl) /* (x,y) within font glyph gl? */
335			double x, y;
336			GLYPH *gl;
337			{
338			int n, ncross;
339			int xlb, ylb;
340			register GLYPH p0, p1;
341
342	greg	1.7	if (gl == NULL)
343	greg	1.1	return(0);
344	greg	1.5	x = 256.0; / get glyph coordinates */
345			y *= 256.0;
346			xlb = x + 0.5;
347			ylb = y + 0.5;
348	greg	1.1	n = gl++; / get # of vertices */
349			p0 = gl + 2(n-1); / connect last to first */
350			p1 = gl;
351			ncross = 0;
352			/* positive x axis cross test */
353			while (n--) {
354			if ((p0[1] > ylb) ^ (p1[1] > ylb))
355			if (p0[0] > xlb && p1[0] > xlb)
356			ncross++;
357			else if (p0[0] > xlb \|\| p1[0] > xlb)
358			ncross += (p1[1] > p0[1]) ^
359			((p0[1]-y)*(p1[0]-x) >
360			(p0[0]-x)*(p1[1]-y));
361			p0 = p1;
362			p1 += 2;
363			}
364			return(ncross & 01);
365			}