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#ifndef lint |
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static const char RCSid[] = "$Id: text.c,v 2.28 2021/11/19 22:51:31 greg Exp $"; |
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#endif |
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/* |
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* text.c - functions for text patterns and mixtures. |
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*/ |
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|
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#include "copyright.h" |
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|
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#include "ray.h" |
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#include "paths.h" |
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#include "otypes.h" |
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#include "rtotypes.h" |
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#include "font.h" |
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|
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/* |
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* A text pattern is specified as the text (a file or line), |
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* the upper left anchor point, the right motion vector, the down |
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* motion vector, and the foreground and background brightness. |
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* For a file, the description is as follows: |
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* |
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* modifier brighttext id |
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* 2 fontfile textfile |
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* 0 |
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* 11+ |
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* Ax Ay Az |
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* Rx Ry Rz |
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* Dx Dy Dz |
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* foreground background |
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* [spacing] |
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* |
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* For a single line, we use: |
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* |
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* modifier brighttext id |
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* N+2 fontfile . This is a line with N words... |
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* 0 |
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* 11+ |
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* Ax Ay Az |
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* Rx Ry Rz |
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* Dx Dy Dz |
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* foreground background |
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* [spacing] |
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* |
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* Colortext is identical, except colors are given rather than |
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* brightnesses. |
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* |
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* Mixtext has foreground and background modifiers: |
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* |
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* modifier mixtext id |
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* 4+ foremod backmod fontfile text.. |
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* 0 |
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* 9+ |
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* Ax Ay Az |
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* Rx Ry Rz |
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* Dx Dy Dz |
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* [spacing] |
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*/ |
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|
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#define fndx(m) ((m)->otype==MIX_TEXT ? 2 : 0) |
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#define tndx(m) ((m)->otype==MIX_TEXT ? 3 : 1) |
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#define sndx(m) ((m)->otype==PAT_BTEXT ? 11 : \ |
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(m)->otype==PAT_CTEXT ? 15 : 9) |
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|
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typedef struct tline { |
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struct tline *next; /* pointer to next line */ |
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short *spc; /* character spacing */ |
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int width; /* total line width */ |
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/* followed by the string */ |
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} TLINE; |
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|
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#define TLSTR(l) ((char *)((l)+1)) |
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|
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typedef struct { |
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FVECT right, down; /* right and down unit vectors */ |
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FONT *f; /* our font */ |
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TLINE tl; /* line list */ |
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} TEXT; |
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|
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static TLINE * tlalloc(char *s); |
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static TEXT * gettext(OBJREC *tm); |
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static int intext(FVECT p, OBJREC *m); |
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static int inglyph(double x, double y, GLYPH *gl); |
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|
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|
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int |
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do_text( |
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OBJREC *m, |
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RAY *r |
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) |
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{ |
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FVECT v; |
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int foreground; |
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/* get transformed position */ |
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if (r->rox != NULL) |
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multp3(v, r->rop, r->rox->b.xfm); |
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else |
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VCOPY(v, r->rop); |
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/* check if we are within a text glyph */ |
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foreground = intext(v, m); |
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/* modify */ |
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if (m->otype == MIX_TEXT) { |
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OBJECT omod; |
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char *modname = m->oargs.sarg[foreground ? 0 : 1]; |
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if (!strcmp(modname, VOIDID)) |
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omod = OVOID; |
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else if ((omod = lastmod(objndx(m), modname)) == OVOID) { |
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sprintf(errmsg, "undefined modifier \"%s\"", modname); |
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objerror(m, USER, errmsg); |
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} |
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if (rayshade(r, omod)) { |
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if (m->omod != OVOID) |
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objerror(m, USER, "inappropriate modifier"); |
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return(1); |
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} |
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} else if (m->otype == PAT_BTEXT) { |
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if (foreground) { |
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scalescolor(r->pcol, m->oargs.farg[9]); |
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} else { |
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scalescolor(r->pcol, m->oargs.farg[10]); |
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} |
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} else { /* PAT_CTEXT */ |
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SCOLOR scval; |
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if (foreground) |
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setscolor(scval, m->oargs.farg[9], |
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m->oargs.farg[10], |
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m->oargs.farg[11]); |
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else |
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setscolor(scval, m->oargs.farg[12], |
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m->oargs.farg[13], |
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m->oargs.farg[14]); |
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smultscolor(r->pcol, scval); |
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} |
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return(0); |
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} |
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|
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|
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static TLINE * |
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tlalloc( /* allocate and assign text line */ |
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char *s |
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) |
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{ |
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int siz; |
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TLINE *tl; |
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|
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siz = strlen(s) + 1; |
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if ((tl=(TLINE *)malloc(sizeof(TLINE)+siz)) == NULL || |
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(tl->spc=(short *)malloc(siz*sizeof(short))) == NULL) |
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error(SYSTEM, "out of memory in tlalloc"); |
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tl->next = NULL; |
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strcpy(TLSTR(tl), s); |
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return(tl); |
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} |
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|
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|
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static TEXT * |
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gettext( /* get text structure for material */ |
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OBJREC *tm |
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) |
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{ |
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#define R (tm->oargs.farg+3) |
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#define D (tm->oargs.farg+6) |
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FVECT DxR; |
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double d; |
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FILE *fp; |
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char linbuf[512]; |
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TEXT *t; |
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int i; |
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TLINE *tlp; |
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char *s; |
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|
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if ((t = (TEXT *)tm->os) != NULL) |
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return(t); |
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/* check arguments */ |
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if (tm->oargs.nsargs - tndx(tm) < 1 || tm->oargs.nfargs < sndx(tm)) |
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objerror(tm, USER, "bad # arguments"); |
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if ((t = (TEXT *)malloc(sizeof(TEXT))) == NULL) |
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error(SYSTEM, "out of memory in gettext"); |
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/* compute vectors */ |
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fcross(DxR, D, R); |
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fcross(t->right, DxR, D); |
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d = DOT(t->right,t->right); |
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if (d <= FTINY*FTINY*FTINY*FTINY) |
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objerror(tm, USER, "illegal motion vector"); |
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d = DOT(D,D)/d; |
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for (i = 0; i < 3; i++) |
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t->right[i] *= d; |
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fcross(t->down, R, DxR); |
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d = DOT(R,R)/DOT(t->down,t->down); |
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for (i = 0; i < 3; i++) |
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t->down[i] *= d; |
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/* get text */ |
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tlp = &t->tl; |
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if (tm->oargs.nsargs - tndx(tm) > 1) { /* single line */ |
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s = linbuf; |
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for (i = tndx(tm)+1; i < tm->oargs.nsargs; i++) { |
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strcpy(s, tm->oargs.sarg[i]); |
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s += strlen(s); |
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*s++ = ' '; |
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} |
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*--s = '\0'; |
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tlp->next = tlalloc(linbuf); |
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tlp = tlp->next; |
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} else { /* text file */ |
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if ((s = getpath(tm->oargs.sarg[tndx(tm)], |
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getrlibpath(), R_OK)) == NULL) { |
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sprintf(errmsg, "cannot find text file \"%s\"", |
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tm->oargs.sarg[tndx(tm)]); |
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error(SYSTEM, errmsg); |
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} |
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if ((fp = fopen(s, "r")) == NULL) { |
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sprintf(errmsg, "cannot open text file \"%s\"", s); |
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error(SYSTEM, errmsg); |
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} |
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while (fgets(linbuf, sizeof(linbuf), fp) != NULL) { |
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s = linbuf + strlen(linbuf) - 1; |
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if (*s == '\n') |
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*s = '\0'; |
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tlp->next = tlalloc(linbuf); |
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tlp = tlp->next; |
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} |
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fclose(fp); |
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} |
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tlp->next = NULL; |
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/* get the font */ |
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t->f = getfont(tm->oargs.sarg[fndx(tm)]); |
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if (!t->f) |
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objerror(tm, USER, "font load error"); |
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/* compute character spacing */ |
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i = sndx(tm); |
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d = i < tm->oargs.nfargs ? tm->oargs.farg[i] : 0.0; |
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i = d * 255.0; |
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t->tl.width = 0; |
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for (tlp = t->tl.next; tlp != NULL; tlp = tlp->next) { |
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if (i < 0) |
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tlp->width = squeeztext(tlp->spc, TLSTR(tlp), t->f, -i); |
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else if (i > 0) |
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tlp->width = proptext(tlp->spc, TLSTR(tlp), t->f, i, 3); |
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else |
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tlp->width = uniftext(tlp->spc, TLSTR(tlp), t->f); |
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if (tlp->width > t->tl.width) |
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t->tl.width = tlp->width; |
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} |
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/* we're done */ |
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tm->os = (char *)t; |
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return(t); |
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#undef R |
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#undef D |
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} |
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|
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|
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void |
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freetext( /* free text structures associated with m */ |
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OBJREC *m |
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) |
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{ |
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TEXT *tp; |
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TLINE *tlp; |
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|
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tp = (TEXT *)m->os; |
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if (tp == NULL) |
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return; |
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while ((tlp = tp->tl.next) != NULL) { |
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tp->tl.next = tlp->next; |
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free((void *)tlp->spc); |
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free((void *)tlp); |
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} |
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freefont(tp->f); /* release font reference */ |
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free((void *)tp); |
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m->os = NULL; |
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} |
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|
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|
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static int |
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intext( /* check to see if p is in text glyph */ |
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FVECT p, |
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OBJREC *m |
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) |
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{ |
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TEXT *tp; |
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TLINE *tlp; |
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FVECT v; |
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double y, x; |
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int i, h; |
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/* first, compute position in text */ |
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tp = gettext(m); |
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v[0] = p[0] - m->oargs.farg[0]; |
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v[1] = p[1] - m->oargs.farg[1]; |
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v[2] = p[2] - m->oargs.farg[2]; |
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x = DOT(v, tp->right); |
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i = sndx(m); |
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if (i < m->oargs.nfargs) |
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x *= tp->f->mwidth + 255.*fabs(m->oargs.farg[i]); |
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else |
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x *= 255.; |
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h = x; |
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i = y = DOT(v, tp->down); |
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if (x < 0.0 || y < 0.0) |
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return(0); |
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x -= (double)h; |
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y = ((i+1) - y)*255.; |
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/* find the line position */ |
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for (tlp = tp->tl.next; tlp != NULL; tlp = tlp->next) |
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if (--i < 0) |
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break; |
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if (tlp == NULL || h >= tlp->width) |
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return(0); |
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for (i = 0; (h -= tlp->spc[i]) >= 0; i++) |
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if (h < 255 && inglyph(h+x, y, |
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tp->f->fg[TLSTR(tlp)[i]&0xff])) |
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return(1); |
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return(0); |
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} |
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|
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|
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static int |
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inglyph( /* (x,y) within font glyph gl? */ |
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double x, /* real coordinates in range [0,255) */ |
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double y, |
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GLYPH *gl |
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) |
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{ |
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int n, ncross; |
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int xlb, ylb; |
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int tv; |
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GORD *p0, *p1; |
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|
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if (gl == NULL) |
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return(0); |
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xlb = x; |
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ylb = y; |
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if (gl->left > xlb || gl->right <= xlb || /* check extent */ |
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gl->bottom > ylb || gl->top <= ylb) |
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return(0); |
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xlb = xlb<<1 | 1; /* add 1/2 to test points... */ |
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ylb = ylb<<1 | 1; /* ...so no equal comparisons */ |
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n = gl->nverts; /* get # of vertices */ |
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p0 = gvlist(gl) + 2*(n-1); /* connect last to first */ |
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p1 = gvlist(gl); |
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ncross = 0; |
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/* positive x axis cross test */ |
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while (n--) { |
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if ((p0[1]<<1 > ylb) ^ (p1[1]<<1 > ylb)) { |
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tv = (p0[0]<<1 > xlb) | ((p1[0]<<1 > xlb) << 1); |
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if (tv == 03) |
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ncross++; |
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else if (tv) |
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ncross += (p1[1] > p0[1]) ^ |
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((p0[1]-y)*(p1[0]-x) > |
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(p0[0]-x)*(p1[1]-y)); |
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} |
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p0 = p1; |
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p1 += 2; |
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} |
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return(ncross & 01); |
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} |
