| 1 |
#ifndef lint |
| 2 |
static const char RCSid[] = "$Id: text.c,v 2.22 2003/05/13 17:58:33 greg Exp $"; |
| 3 |
#endif |
| 4 |
/* |
| 5 |
* text.c - functions for text patterns and mixtures. |
| 6 |
*/ |
| 7 |
|
| 8 |
#include "copyright.h" |
| 9 |
|
| 10 |
#include "ray.h" |
| 11 |
|
| 12 |
#include "otypes.h" |
| 13 |
|
| 14 |
#include "font.h" |
| 15 |
|
| 16 |
/* |
| 17 |
* A text pattern is specified as the text (a file or line), |
| 18 |
* the upper left anchor point, the right motion vector, the down |
| 19 |
* motion vector, and the foreground and background brightness. |
| 20 |
* For a file, the description is as follows: |
| 21 |
* |
| 22 |
* modifier brighttext id |
| 23 |
* 2 fontfile textfile |
| 24 |
* 0 |
| 25 |
* 11+ |
| 26 |
* Ax Ay Az |
| 27 |
* Rx Ry Rz |
| 28 |
* Dx Dy Dz |
| 29 |
* foreground background |
| 30 |
* [spacing] |
| 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 |
* [spacing] |
| 43 |
* |
| 44 |
* Colortext is identical, except colors are given rather than |
| 45 |
* brightnesses. |
| 46 |
* |
| 47 |
* Mixtext has foreground and background modifiers: |
| 48 |
* |
| 49 |
* modifier mixtext id |
| 50 |
* 4+ foremod backmod fontfile text.. |
| 51 |
* 0 |
| 52 |
* 9+ |
| 53 |
* Ax Ay Az |
| 54 |
* Rx Ry Rz |
| 55 |
* Dx Dy Dz |
| 56 |
* [spacing] |
| 57 |
*/ |
| 58 |
|
| 59 |
#define fndx(m) ((m)->otype==MIX_TEXT ? 2 : 0) |
| 60 |
#define tndx(m) ((m)->otype==MIX_TEXT ? 3 : 1) |
| 61 |
#define sndx(m) ((m)->otype==PAT_BTEXT ? 11 : \ |
| 62 |
(m)->otype==PAT_CTEXT ? 15 : 9) |
| 63 |
|
| 64 |
typedef struct tline { |
| 65 |
struct tline *next; /* pointer to next line */ |
| 66 |
short *spc; /* character spacing */ |
| 67 |
int width; /* total line width */ |
| 68 |
/* followed by the string */ |
| 69 |
} TLINE; |
| 70 |
|
| 71 |
#define TLSTR(l) ((char *)((l)+1)) |
| 72 |
|
| 73 |
typedef struct { |
| 74 |
FVECT right, down; /* right and down unit vectors */ |
| 75 |
FONT *f; /* our font */ |
| 76 |
TLINE tl; /* line list */ |
| 77 |
} TEXT; |
| 78 |
|
| 79 |
TEXT *gettext(); |
| 80 |
|
| 81 |
TLINE *tlalloc(); |
| 82 |
|
| 83 |
|
| 84 |
do_text(m, r) |
| 85 |
register OBJREC *m; |
| 86 |
RAY *r; |
| 87 |
{ |
| 88 |
FVECT v; |
| 89 |
int foreground; |
| 90 |
/* get transformed position */ |
| 91 |
if (r->rox != NULL) |
| 92 |
multp3(v, r->rop, r->rox->b.xfm); |
| 93 |
else |
| 94 |
VCOPY(v, r->rop); |
| 95 |
/* check if we are within a text glyph */ |
| 96 |
foreground = intext(v, m); |
| 97 |
/* modify */ |
| 98 |
if (m->otype == MIX_TEXT) { |
| 99 |
OBJECT omod; |
| 100 |
char *modname = m->oargs.sarg[foreground ? 0 : 1]; |
| 101 |
if (!strcmp(modname, VOIDID)) |
| 102 |
omod = OVOID; |
| 103 |
else if ((omod = lastmod(objndx(m), modname)) == OVOID) { |
| 104 |
sprintf(errmsg, "undefined modifier \"%s\"", modname); |
| 105 |
objerror(m, USER, errmsg); |
| 106 |
} |
| 107 |
if (rayshade(r, omod)) { |
| 108 |
if (m->omod != OVOID) |
| 109 |
objerror(m, USER, "inappropriate modifier"); |
| 110 |
return(1); |
| 111 |
} |
| 112 |
} else if (m->otype == PAT_BTEXT) { |
| 113 |
if (foreground) |
| 114 |
scalecolor(r->pcol, m->oargs.farg[9]); |
| 115 |
else |
| 116 |
scalecolor(r->pcol, m->oargs.farg[10]); |
| 117 |
} else { /* PAT_CTEXT */ |
| 118 |
COLOR cval; |
| 119 |
if (foreground) |
| 120 |
setcolor(cval, m->oargs.farg[9], |
| 121 |
m->oargs.farg[10], |
| 122 |
m->oargs.farg[11]); |
| 123 |
else |
| 124 |
setcolor(cval, m->oargs.farg[12], |
| 125 |
m->oargs.farg[13], |
| 126 |
m->oargs.farg[14]); |
| 127 |
multcolor(r->pcol, cval); |
| 128 |
} |
| 129 |
return(0); |
| 130 |
} |
| 131 |
|
| 132 |
|
| 133 |
TLINE * |
| 134 |
tlalloc(s) /* allocate and assign text line */ |
| 135 |
char *s; |
| 136 |
{ |
| 137 |
register int siz; |
| 138 |
register TLINE *tl; |
| 139 |
|
| 140 |
siz = strlen(s) + 1; |
| 141 |
if ((tl=(TLINE *)malloc(sizeof(TLINE)+siz)) == NULL || |
| 142 |
(tl->spc=(short *)malloc(siz*sizeof(short))) == NULL) |
| 143 |
error(SYSTEM, "out of memory in tlalloc"); |
| 144 |
tl->next = NULL; |
| 145 |
strcpy(TLSTR(tl), s); |
| 146 |
return(tl); |
| 147 |
} |
| 148 |
|
| 149 |
|
| 150 |
TEXT * |
| 151 |
gettext(tm) /* get text structure for material */ |
| 152 |
register OBJREC *tm; |
| 153 |
{ |
| 154 |
#define R (tm->oargs.farg+3) |
| 155 |
#define D (tm->oargs.farg+6) |
| 156 |
FVECT DxR; |
| 157 |
double d; |
| 158 |
FILE *fp; |
| 159 |
char linbuf[512]; |
| 160 |
TEXT *t; |
| 161 |
register int i; |
| 162 |
register TLINE *tlp; |
| 163 |
register char *s; |
| 164 |
|
| 165 |
if ((t = (TEXT *)tm->os) != NULL) |
| 166 |
return(t); |
| 167 |
/* check arguments */ |
| 168 |
if (tm->oargs.nsargs - tndx(tm) < 1 || tm->oargs.nfargs < sndx(tm)) |
| 169 |
objerror(tm, USER, "bad # arguments"); |
| 170 |
if ((t = (TEXT *)malloc(sizeof(TEXT))) == NULL) |
| 171 |
error(SYSTEM, "out of memory in gettext"); |
| 172 |
/* compute vectors */ |
| 173 |
fcross(DxR, D, R); |
| 174 |
fcross(t->right, DxR, D); |
| 175 |
d = DOT(t->right,t->right); |
| 176 |
if (d <= FTINY*FTINY*FTINY*FTINY) |
| 177 |
objerror(tm, USER, "illegal motion vector"); |
| 178 |
d = DOT(D,D)/d; |
| 179 |
for (i = 0; i < 3; i++) |
| 180 |
t->right[i] *= d; |
| 181 |
fcross(t->down, R, DxR); |
| 182 |
d = DOT(R,R)/DOT(t->down,t->down); |
| 183 |
for (i = 0; i < 3; i++) |
| 184 |
t->down[i] *= d; |
| 185 |
/* get text */ |
| 186 |
tlp = &t->tl; |
| 187 |
if (tm->oargs.nsargs - tndx(tm) > 1) { /* single line */ |
| 188 |
s = linbuf; |
| 189 |
for (i = tndx(tm)+1; i < tm->oargs.nsargs; i++) { |
| 190 |
strcpy(s, tm->oargs.sarg[i]); |
| 191 |
s += strlen(s); |
| 192 |
*s++ = ' '; |
| 193 |
} |
| 194 |
*--s = '\0'; |
| 195 |
tlp->next = tlalloc(linbuf); |
| 196 |
tlp = tlp->next; |
| 197 |
} else { /* text file */ |
| 198 |
if ((s = getpath(tm->oargs.sarg[tndx(tm)], |
| 199 |
getrlibpath(), R_OK)) == NULL) { |
| 200 |
sprintf(errmsg, "cannot find text file \"%s\"", |
| 201 |
tm->oargs.sarg[tndx(tm)]); |
| 202 |
error(USER, errmsg); |
| 203 |
} |
| 204 |
if ((fp = fopen(s, "r")) == NULL) { |
| 205 |
sprintf(errmsg, "cannot open text file \"%s\"", s); |
| 206 |
error(SYSTEM, errmsg); |
| 207 |
} |
| 208 |
while (fgets(linbuf, sizeof(linbuf), fp) != NULL) { |
| 209 |
s = linbuf + strlen(linbuf) - 1; |
| 210 |
if (*s == '\n') |
| 211 |
*s = '\0'; |
| 212 |
tlp->next = tlalloc(linbuf); |
| 213 |
tlp = tlp->next; |
| 214 |
} |
| 215 |
fclose(fp); |
| 216 |
} |
| 217 |
tlp->next = NULL; |
| 218 |
/* get the font */ |
| 219 |
t->f = getfont(tm->oargs.sarg[fndx(tm)]); |
| 220 |
/* compute character spacing */ |
| 221 |
i = sndx(tm); |
| 222 |
d = i < tm->oargs.nfargs ? tm->oargs.farg[i] : 0.0; |
| 223 |
i = d * 255.0; |
| 224 |
t->tl.width = 0; |
| 225 |
for (tlp = t->tl.next; tlp != NULL; tlp = tlp->next) { |
| 226 |
if (i < 0) |
| 227 |
tlp->width = squeeztext(tlp->spc, TLSTR(tlp), t->f, -i); |
| 228 |
else if (i > 0) |
| 229 |
tlp->width = proptext(tlp->spc, TLSTR(tlp), t->f, i, 3); |
| 230 |
else |
| 231 |
tlp->width = uniftext(tlp->spc, TLSTR(tlp), t->f); |
| 232 |
if (tlp->width > t->tl.width) |
| 233 |
t->tl.width = tlp->width; |
| 234 |
} |
| 235 |
/* we're done */ |
| 236 |
tm->os = (char *)t; |
| 237 |
return(t); |
| 238 |
#undef R |
| 239 |
#undef D |
| 240 |
} |
| 241 |
|
| 242 |
|
| 243 |
freetext(m) /* free text structures associated with m */ |
| 244 |
OBJREC *m; |
| 245 |
{ |
| 246 |
register TEXT *tp; |
| 247 |
register TLINE *tlp; |
| 248 |
|
| 249 |
tp = (TEXT *)m->os; |
| 250 |
if (tp == NULL) |
| 251 |
return; |
| 252 |
while ((tlp = tp->tl.next) != NULL) { |
| 253 |
tp->tl.next = tlp->next; |
| 254 |
free((void *)tlp->spc); |
| 255 |
free((void *)tlp); |
| 256 |
} |
| 257 |
freefont(tp->f); /* release font reference */ |
| 258 |
free((void *)tp); |
| 259 |
m->os = NULL; |
| 260 |
} |
| 261 |
|
| 262 |
|
| 263 |
intext(p, m) /* check to see if p is in text glyph */ |
| 264 |
FVECT p; |
| 265 |
OBJREC *m; |
| 266 |
{ |
| 267 |
register TEXT *tp; |
| 268 |
register TLINE *tlp; |
| 269 |
FVECT v; |
| 270 |
double y, x; |
| 271 |
register int i, h; |
| 272 |
/* first, compute position in text */ |
| 273 |
tp = gettext(m); |
| 274 |
v[0] = p[0] - m->oargs.farg[0]; |
| 275 |
v[1] = p[1] - m->oargs.farg[1]; |
| 276 |
v[2] = p[2] - m->oargs.farg[2]; |
| 277 |
x = DOT(v, tp->right); |
| 278 |
i = sndx(m); |
| 279 |
if (i < m->oargs.nfargs) |
| 280 |
x *= tp->f->mwidth + 255.*fabs(m->oargs.farg[i]); |
| 281 |
else |
| 282 |
x *= 255.; |
| 283 |
h = x; |
| 284 |
i = y = DOT(v, tp->down); |
| 285 |
if (x < 0.0 || y < 0.0) |
| 286 |
return(0); |
| 287 |
x -= (double)h; |
| 288 |
y = ((i+1) - y)*255.; |
| 289 |
/* find the line position */ |
| 290 |
for (tlp = tp->tl.next; tlp != NULL; tlp = tlp->next) |
| 291 |
if (--i < 0) |
| 292 |
break; |
| 293 |
if (tlp == NULL || h >= tlp->width) |
| 294 |
return(0); |
| 295 |
for (i = 0; (h -= tlp->spc[i]) >= 0; i++) |
| 296 |
if (h < 255 && inglyph(h+x, y, |
| 297 |
tp->f->fg[TLSTR(tlp)[i]&0xff])) |
| 298 |
return(1); |
| 299 |
return(0); |
| 300 |
} |
| 301 |
|
| 302 |
|
| 303 |
inglyph(x, y, gl) /* (x,y) within font glyph gl? */ |
| 304 |
double x, y; /* real coordinates in range [0,255) */ |
| 305 |
register GLYPH *gl; |
| 306 |
{ |
| 307 |
int n, ncross; |
| 308 |
int xlb, ylb; |
| 309 |
int tv; |
| 310 |
register GORD *p0, *p1; |
| 311 |
|
| 312 |
if (gl == NULL) |
| 313 |
return(0); |
| 314 |
xlb = x; |
| 315 |
ylb = y; |
| 316 |
if (gl->left > xlb || gl->right <= xlb || /* check extent */ |
| 317 |
gl->bottom > ylb || gl->top <= ylb) |
| 318 |
return(0); |
| 319 |
xlb = xlb<<1 | 1; /* add 1/2 to test points... */ |
| 320 |
ylb = ylb<<1 | 1; /* ...so no equal comparisons */ |
| 321 |
n = gl->nverts; /* get # of vertices */ |
| 322 |
p0 = gvlist(gl) + 2*(n-1); /* connect last to first */ |
| 323 |
p1 = gvlist(gl); |
| 324 |
ncross = 0; |
| 325 |
/* positive x axis cross test */ |
| 326 |
while (n--) { |
| 327 |
if ((p0[1]<<1 > ylb) ^ (p1[1]<<1 > ylb)) { |
| 328 |
tv = (p0[0]<<1 > xlb) | ((p1[0]<<1 > xlb) << 1); |
| 329 |
if (tv == 03) |
| 330 |
ncross++; |
| 331 |
else if (tv) |
| 332 |
ncross += (p1[1] > p0[1]) ^ |
| 333 |
((p0[1]-y)*(p1[0]-x) > |
| 334 |
(p0[0]-x)*(p1[1]-y)); |
| 335 |
} |
| 336 |
p0 = p1; |
| 337 |
p1 += 2; |
| 338 |
} |
| 339 |
return(ncross & 01); |
| 340 |
} |
