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;
        v[0] = r->rop[0] - ap[0];
        v[1] = r->rop[1] - ap[1];
        v[2] = r->rop[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)) == 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)) == 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:	1.1
Committed:	Thu Feb 2 10:41:47 1989 UTC (35 years, 3 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Log Message:	Initial revision
#	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			v[0] = r->rop[0] - ap[0];
93			v[1] = r->rop[1] - ap[1];
94			v[2] = r->rop[2] - ap[2];
95			col = x = DOT(v, ap+3) / DOT(ap+3, ap+3);
96			lno = y = DOT(v, ap+6) / DOT(ap+6, ap+6);
97			x -= col;
98			y = (lno+1) - y;
99			/* get the font character, check it */
100			if ((g = getglyph(m, lno, col)) == NULL)
101			foreground = 0;
102			else
103			foreground = inglyph(x, y, g);
104			/* modify */
105			if (m->otype == MIX_TEXT) {
106			OBJECT omod;
107			char *modname = m->oargs.sarg[foreground ? 0 : 1];
108			if (!strcmp(modname, VOIDID))
109			omod = OVOID;
110			else if ((omod = modifier(modname)) == OVOID) {
111			sprintf(errmsg, "undefined modifier \"%s\"", modname);
112			objerror(m, USER, errmsg);
113			}
114			raymixture(r, omod, OVOID, 1.0);
115			} else if (m->otype == PAT_BTEXT) {
116			if (foreground)
117			scalecolor(r->pcol, ap[9]);
118			else
119			scalecolor(r->pcol, ap[10]);
120			} else { /* PAT_CTEXT */
121			COLOR cval;
122			if (foreground)
123			setcolor(cval, ap[9], ap[10], ap[11]);
124			else
125			setcolor(cval, ap[12], ap[13], ap[14]);
126			multcolor(r->pcol, cval);
127			}
128			}
129
130
131			GLYPH *
132			getglyph(tm, lno, col) /* get a glyph from a text description */
133			register OBJREC *tm;
134			int lno;
135			int col;
136			{
137			extern char strcpy(), fgets();
138			FILE *fp;
139			char linbuf[512];
140			register int i;
141			register char **txt;
142			register char *s;
143
144			if (lno < 0 \|\| col < 0)
145			return(NULL);
146			if (tm->os == NULL) {
147			txt = (char *)malloc(2sizeof(char **));
148			if (txt == NULL)
149			goto memerr;
150			if (tm->oargs.nsargs - tndx(tm) > 1) { /* single line */
151			s = linbuf;
152			for (i = tndx(tm)+1; i < tm->oargs.nsargs; i++) {
153			strcpy(s, tm->oargs.sarg[i]);
154			s += strlen(s);
155			*s++ = ' ';
156			}
157			*--s = '\0';
158			txt[0] = savqstr(linbuf);
159			txt[1] = NULL;
160			} else { /* text file */
161			if ((s = getpath(tm->oargs.sarg[tndx(tm)],
162			libpath)) == NULL) {
163			sprintf(errmsg, "cannot find text file \"%s\"",
164			tm->oargs.sarg[tndx(tm)]);
165			error(USER, errmsg);
166			}
167			if ((fp = fopen(s, "r")) == NULL) {
168			sprintf(errmsg, "cannot open text file \"%s\"",
169			s);
170			error(SYSTEM, errmsg);
171			}
172			for (i=0; fgets(linbuf,sizeof(linbuf),fp)!=NULL; i++) {
173			s = linbuf + strlen(linbuf) - 1;
174			if (*s == '\n')
175			*s = '\0';
176			txt=(char *)realloc(txt,(i+2)sizeof(char **));
177			if (txt == NULL)
178			goto memerr;
179			txt[i] = savqstr(linbuf);
180			}
181			txt[i] = NULL;
182			fclose(fp);
183			}
184			tm->os = (char *)txt;
185			}
186			txt = (char **)tm->os;
187			for (i = 0; i < lno; i++)
188			if (txt[i] == NULL)
189			break;
190			if ((s = txt[i]) == NULL \|\| col >= strlen(s))
191			return(NULL);
192			else
193			return(getfont(tm->oargs.sarg[fndx(tm)])->fg[s[col]]);
194			memerr:
195			error(SYSTEM, "out of memory in getglyph");
196			}
197
198
199			FONT *
200			getfont(fname) /* return font fname */
201			char *fname;
202			{
203			FILE *fp;
204			char pathname, err;
205			int gn, ngv, gv;
206			register GLYPH *g;
207			register FONT *f;
208
209			for (f = fontlist; f != NULL; f = f->next)
210			if (!strcmp(f->name, fname))
211			return(f);
212			/* load the font file */
213			if ((pathname = getpath(fname, libpath)) == NULL) {
214			sprintf(errmsg, "cannot find font file \"%s\"", fname);
215			error(USER, errmsg);
216			}
217			f = (FONT *)calloc(1, sizeof(FONT));
218			if (f == NULL)
219			goto memerr;
220			f->name = savestr(fname);
221			if ((fp = fopen(pathname, "r")) == NULL) {
222			sprintf(errmsg, "cannot open font file \"%s\"",
223			pathname);
224			error(SYSTEM, errmsg);
225			}
226			while (fscanf(fp, "%d", &gn) == 1) { /* get each glyph */
227			if (gn < 0 \|\| gn > 255) {
228			err = "illegal";
229			goto fonterr;
230			}
231			if (f->fg[gn] != NULL) {
232			err = "duplicate";
233			goto fonterr;
234			}
235			if (fscanf(fp, "%d", &ngv) != 1 \|\|
236			ngv < 0 \|\| ngv > 255) {
237			err = "bad # vertices for";
238			goto fonterr;
239			}
240			g = (GLYPH )malloc((2ngv+1)*sizeof(GLYPH));
241			if (g == NULL)
242			goto memerr;
243			f->fg[gn] = g;
244			*g++ = ngv;
245			ngv *= 2;
246			while (ngv--) {
247			if (fscanf(fp, "%d", &gv) != 1 \|\|
248			gv < 0 \|\| gv > 255) {
249			err = "bad vertex for";
250			goto fonterr;
251			}
252			*g++ = gv;
253			}
254			}
255			fclose(fp);
256			f->next = fontlist;
257			return(fontlist = f);
258			fonterr:
259			sprintf(errmsg, "%s character (%d) in font file \"%s\"",
260			err, gn, pathname);
261			error(USER, errmsg);
262			memerr:
263			error(SYSTEM, "out of memory in fontglyph");
264			}
265
266
267			inglyph(x, y, gl) /* (x,y) within font glyph gl? */
268			double x, y;
269			GLYPH *gl;
270			{
271			int n, ncross;
272			int xlb, ylb;
273			register GLYPH p0, p1;
274
275			if (x < 0.0 \|\| y < 0.0)
276			return(0);
277			xlb = x = 255.0; / get glyph coordinates */
278			ylb = y *= 255.0;
279			n = gl++; / get # of vertices */
280			p0 = gl + 2(n-1); / connect last to first */
281			p1 = gl;
282			ncross = 0;
283			/* positive x axis cross test */
284			while (n--) {
285			if ((p0[1] > ylb) ^ (p1[1] > ylb))
286			if (p0[0] > xlb && p1[0] > xlb)
287			ncross++;
288			else if (p0[0] > xlb \|\| p1[0] > xlb)
289			ncross += (p1[1] > p0[1]) ^
290			((p0[1]-y)*(p1[0]-x) >
291			(p0[0]-x)*(p1[1]-y));
292			p0 = p1;
293			p1 += 2;
294			}
295			return(ncross & 01);
296			}