src/rt/text.c

/* Copyright (c) 1986 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 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;
        multp3(v, r->rop, r->robx);
        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;
{
        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 (fscanf(fp, "%d", &gn) == 1) {    /* get each glyph */
                if (gn < 0 || gn > 255) {
                        err = "illegal";
                        goto fonterr;
                }
                if (f->fg[gn] != NULL) {
                        err = "duplicate";
                        goto fonterr;
                }
                if (fscanf(fp, "%d", &ngv) != 1 ||
                                ngv < 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 (fscanf(fp, "%d", &gv) != 1 ||
                                        gv < 0 || gv > 255) {
                                err = "bad vertex for";
                                goto fonterr;
                        }
                        *g++ = gv;
                }
        }
        fclose(fp);
        f->next = fontlist;
        return(fontlist = f);
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);
        xlb = x *= 255.0;               /* get glyph coordinates */
        ylb = y *= 255.0;
        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:	1.3
Committed:	Thu Jul 27 22:25:17 1989 UTC (34 years, 9 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 1.2:	+2 -2 lines
Log Message:	Changed getpath to check permissions
#	User	Rev	Content
1	greg	1.1	/* Copyright (c) 1986 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 GLYPH *getglyph();
69
70			extern FONT *getfont();
71
72			static FONT fontlist = NULL; / our font list */
73
74
75			text(m, r)
76			register OBJREC *m;
77			RAY *r;
78			{
79			double v[3], y, x;
80			int col, lno;
81			int foreground;
82			GLYPH *g;
83			register double *ap;
84
85			if (m->oargs.nsargs - tndx(m) < 1 \|\|
86			m->oargs.nfargs != (m->otype == PAT_BTEXT ? 11 :
87			m->otype == PAT_CTEXT ? 15 : 9))
88			objerror(m, USER, "bad # arguments");
89
90			/* first, discover position in text */
91			ap = m->oargs.farg;
92	greg	1.2	multp3(v, r->rop, r->robx);
93			v[0] -= ap[0];
94			v[1] -= ap[1];
95			v[2] -= ap[2];
96	greg	1.1	col = x = DOT(v, ap+3) / DOT(ap+3, ap+3);
97			lno = y = DOT(v, ap+6) / DOT(ap+6, ap+6);
98			x -= col;
99			y = (lno+1) - y;
100			/* get the font character, check it */
101			if ((g = getglyph(m, lno, col)) == NULL)
102			foreground = 0;
103			else
104			foreground = inglyph(x, y, g);
105			/* modify */
106			if (m->otype == MIX_TEXT) {
107			OBJECT omod;
108			char *modname = m->oargs.sarg[foreground ? 0 : 1];
109			if (!strcmp(modname, VOIDID))
110			omod = OVOID;
111			else if ((omod = modifier(modname)) == OVOID) {
112			sprintf(errmsg, "undefined modifier \"%s\"", modname);
113			objerror(m, USER, errmsg);
114			}
115			raymixture(r, omod, OVOID, 1.0);
116			} else if (m->otype == PAT_BTEXT) {
117			if (foreground)
118			scalecolor(r->pcol, ap[9]);
119			else
120			scalecolor(r->pcol, ap[10]);
121			} else { /* PAT_CTEXT */
122			COLOR cval;
123			if (foreground)
124			setcolor(cval, ap[9], ap[10], ap[11]);
125			else
126			setcolor(cval, ap[12], ap[13], ap[14]);
127			multcolor(r->pcol, cval);
128			}
129			}
130
131
132			GLYPH *
133			getglyph(tm, lno, col) /* get a glyph from a text description */
134			register OBJREC *tm;
135			int lno;
136			int col;
137			{
138			extern char strcpy(), fgets();
139			FILE *fp;
140			char linbuf[512];
141			register int i;
142			register char **txt;
143			register char *s;
144
145			if (lno < 0 \|\| col < 0)
146			return(NULL);
147			if (tm->os == NULL) {
148			txt = (char *)malloc(2sizeof(char **));
149			if (txt == NULL)
150			goto memerr;
151			if (tm->oargs.nsargs - tndx(tm) > 1) { /* single line */
152			s = linbuf;
153			for (i = tndx(tm)+1; i < tm->oargs.nsargs; i++) {
154			strcpy(s, tm->oargs.sarg[i]);
155			s += strlen(s);
156			*s++ = ' ';
157			}
158			*--s = '\0';
159			txt[0] = savqstr(linbuf);
160			txt[1] = NULL;
161			} else { /* text file */
162			if ((s = getpath(tm->oargs.sarg[tndx(tm)],
163	greg	1.3	libpath, R_OK)) == NULL) {
164	greg	1.1	sprintf(errmsg, "cannot find text file \"%s\"",
165			tm->oargs.sarg[tndx(tm)]);
166			error(USER, errmsg);
167			}
168			if ((fp = fopen(s, "r")) == NULL) {
169			sprintf(errmsg, "cannot open text file \"%s\"",
170			s);
171			error(SYSTEM, errmsg);
172			}
173			for (i=0; fgets(linbuf,sizeof(linbuf),fp)!=NULL; i++) {
174			s = linbuf + strlen(linbuf) - 1;
175			if (*s == '\n')
176			*s = '\0';
177			txt=(char *)realloc(txt,(i+2)sizeof(char **));
178			if (txt == NULL)
179			goto memerr;
180			txt[i] = savqstr(linbuf);
181			}
182			txt[i] = NULL;
183			fclose(fp);
184			}
185			tm->os = (char *)txt;
186			}
187			txt = (char **)tm->os;
188			for (i = 0; i < lno; i++)
189			if (txt[i] == NULL)
190			break;
191			if ((s = txt[i]) == NULL \|\| col >= strlen(s))
192			return(NULL);
193			else
194			return(getfont(tm->oargs.sarg[fndx(tm)])->fg[s[col]]);
195			memerr:
196			error(SYSTEM, "out of memory in getglyph");
197			}
198
199
200			FONT *
201			getfont(fname) /* return font fname */
202			char *fname;
203			{
204			FILE *fp;
205			char pathname, err;
206			int gn, ngv, gv;
207			register GLYPH *g;
208			register FONT *f;
209
210			for (f = fontlist; f != NULL; f = f->next)
211			if (!strcmp(f->name, fname))
212			return(f);
213			/* load the font file */
214	greg	1.3	if ((pathname = getpath(fname, libpath, R_OK)) == NULL) {
215	greg	1.1	sprintf(errmsg, "cannot find font file \"%s\"", fname);
216			error(USER, errmsg);
217			}
218			f = (FONT *)calloc(1, sizeof(FONT));
219			if (f == NULL)
220			goto memerr;
221			f->name = savestr(fname);
222			if ((fp = fopen(pathname, "r")) == NULL) {
223			sprintf(errmsg, "cannot open font file \"%s\"",
224			pathname);
225			error(SYSTEM, errmsg);
226			}
227			while (fscanf(fp, "%d", &gn) == 1) { /* get each glyph */
228			if (gn < 0 \|\| gn > 255) {
229			err = "illegal";
230			goto fonterr;
231			}
232			if (f->fg[gn] != NULL) {
233			err = "duplicate";
234			goto fonterr;
235			}
236			if (fscanf(fp, "%d", &ngv) != 1 \|\|
237			ngv < 0 \|\| ngv > 255) {
238			err = "bad # vertices for";
239			goto fonterr;
240			}
241			g = (GLYPH )malloc((2ngv+1)*sizeof(GLYPH));
242			if (g == NULL)
243			goto memerr;
244			f->fg[gn] = g;
245			*g++ = ngv;
246			ngv *= 2;
247			while (ngv--) {
248			if (fscanf(fp, "%d", &gv) != 1 \|\|
249			gv < 0 \|\| gv > 255) {
250			err = "bad vertex for";
251			goto fonterr;
252			}
253			*g++ = gv;
254			}
255			}
256			fclose(fp);
257			f->next = fontlist;
258			return(fontlist = f);
259			fonterr:
260			sprintf(errmsg, "%s character (%d) in font file \"%s\"",
261			err, gn, pathname);
262			error(USER, errmsg);
263			memerr:
264			error(SYSTEM, "out of memory in fontglyph");
265			}
266
267
268			inglyph(x, y, gl) /* (x,y) within font glyph gl? */
269			double x, y;
270			GLYPH *gl;
271			{
272			int n, ncross;
273			int xlb, ylb;
274			register GLYPH p0, p1;
275
276			if (x < 0.0 \|\| y < 0.0)
277			return(0);
278			xlb = x = 255.0; / get glyph coordinates */
279			ylb = y *= 255.0;
280			n = gl++; / get # of vertices */
281			p0 = gl + 2(n-1); / connect last to first */
282			p1 = gl;
283			ncross = 0;
284			/* positive x axis cross test */
285			while (n--) {
286			if ((p0[1] > ylb) ^ (p1[1] > ylb))
287			if (p0[0] > xlb && p1[0] > xlb)
288			ncross++;
289			else if (p0[0] > xlb \|\| p1[0] > xlb)
290			ncross += (p1[1] > p0[1]) ^
291			((p0[1]-y)*(p1[0]-x) >
292			(p0[0]-x)*(p1[1]-y));
293			p0 = p1;
294			p1 += 2;
295			}
296			return(ncross & 01);
297			}