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tetex-bin  3.0
Functions | Variables
scanpage.c File Reference
#include "dvips.h"
#include "protos.h"

Go to the source code of this file.

Functions

Boolean prescanchar P1C (chardesctype *, cd)
Boolean preselectfont P1C (fontdesctype *, f)
short scanpage P1H (void)

Variables

integer firstboploc
integer debug_flag
fontdesctypecurfnt
fontmaptypeffont
quarterwordcurpos
quarterwordcurlim
integer fontmem
integer pagecount
integer pagenum
Boolean compressed
FILEdvifile
char errbuf []
frametype frames []
integer pagecost
Boolean noomega

Function Documentation

Boolean prescanchar P1C ( chardesctype ,
cd   
)

Definition at line 42 of file scanpage.c.

{
   register quarterword *cras ;
   register integer thischar ;

   if ((cd->flags & (PREVPAGE | THISPAGE)) == 0) {
      /* the character hasn't been used before in the current section */
      cras = cd->packptr ;
      if (curfnt->resfont) {
         thischar = PSCHARCOST ;
         cd->flags |= THISPAGE ;
      } else if (cras != NULL) {
         thischar = CHARCOST ;
         if (cd->flags & BIGCHAR)
            thischar += 43 ;
         if (compressed) {
            if ((cd->flags & REPACKED) == 0) {
               repack(cd) ;
               cras = cd->packptr ;
            }
            if ((*cras & 4))
               if ((*cras & 7) == 7)
                  thischar += getlong(cras + 17) ;
               else
                  thischar += getlong(cras + 9) ;
            else
               thischar += getlong(cras + 5) ;
         } else {
            if ((*cras & 4))
               if ((*cras & 7) == 7)
                  thischar += getlong(cras + 1)
                                          * ((getlong(cras + 5) + 7) >> 3) ;
               else
                  thischar += (cras[3] * 256L + cras[4]) *
                                 ((cras[1] * 256L + cras[2] + 7) >> 3) ;
            else
               thischar += ((long)(cras[2] * ((cras[1] + 7) >> 3))) ;
         }
         cd->flags |= THISPAGE ;
      } else
         thischar = 0 ;
      fontmem -= thischar ;
      if (fontmem <= pagecost) {
         if (pagecount > 0)
            return(0) ;
      }
   }
   return(1) ;
}
Boolean preselectfont P1C ( fontdesctype ,
f   
)

Definition at line 98 of file scanpage.c.

{
   curfnt = f ;
   if (curfnt->loaded == 0 || curfnt->loaded == 3) {
      if (!residentfont(curfnt))
         if (!virtualfont(curfnt))
            loadfont(curfnt) ;
   }
   if (curfnt->psname == 0) {
      if (curfnt->loaded < 2) /* virtual font costs nothing (yet) */
         if (curfnt->resfont)
            fontmem -= PSFONTCOST ;
         else {
            fontmem -= FONTCOST + curfnt->maxchars ;
            if (curfnt->loadeddpi != curfnt->dpi)
               fontmem -= 48 ; /* for the new font matrix */
         }
      curfnt->psname = 1 ;
      if (fontmem <= pagecost) {
         if (pagecount > 0)
            return(0) ;
      }
   }
   return(1) ;
}
short scanpage P1H ( void  ) [read]

Definition at line 127 of file scanpage.c.

{
   register shalfword cmd ;
   register chardesctype *cd ;
   register fontmaptype *cfnt = 0 ;
   integer fnt ;
   integer mychar ;
   register frametype *frp = frames ;

  if (firstboploc == 0)
     firstboploc = ftell(dvifile) ;
   pagecost = 0 ;
#ifdef DEBUG
   if (dd(D_PAGE))
#ifdef SHORTINT
   (void)fprintf(stderr,"Scanning page %ld\n", pagenum) ;
#else   /* ~SHORTINT */
   (void)fprintf(stderr,"Scanning page %d\n", pagenum) ;
#endif  /* ~SHORTINT */
#endif  /* DEBUG */
   curfnt = NULL ;
   curpos = NULL ;

   bopcolor(0) ; /* IBM: color - put current colorstack to bopstackdepth */
 
   while (1) {
      switch (cmd=dvibyte()) {
case 130: case 131: case 135: case 136: case 139:
case 247: case 248: case 249: case 250: case 251: case 252: case 253:
case 254: case 255: /* unimplemented or illegal commands */
         (void)sprintf(errbuf,
            "! DVI file contains unexpected command (%d)",cmd) ;
         error(errbuf) ;
case 132: case 137: /* eight-byte commands setrule, putrule */
         (void)dvibyte() ;
         (void)dvibyte() ;
         (void)dvibyte() ;
         (void)dvibyte() ;
case 146: case 151: case 156: case 160: case 165: case 170:
   /* four-byte commands right4, w4, x4, down4, y4, z4 */
         (void)dvibyte() ;
case 145: case 150: case 155: case 159: case 164: case 169:
   /* three-byte commands right3, w3, x3, down3, y3, z3 */
         (void)dvibyte() ;
case 144: case 149: case 154: case 158: case 163: case 168:
   /* two-byte commands right2, w2, x2, down2, y2, z2 */
         (void)dvibyte() ;
case 143: case 148: case 153: case 157: case 162: case 167:
   /* one-byte commands right1, w1, x1, down1, y1, z1 */
         (void)dvibyte() ;
case 147: case 152: case 161: case 166: /* w0, x0, y0, z0 */
case 138: case 141: case 142: /* nop, push, pop */
         break ;
case 134: case 129: /* set2, put2 */
         if (noomega) {
            (void)sprintf(errbuf,
               "! DVI file contains unexpected Omega command (%d)",cmd) ;
            error(errbuf) ;
         }
         mychar = dvibyte() ; mychar = (mychar << 8) + dvibyte() ;
         goto dochar ;
case 133: case 128: cmd = dvibyte() ; /* set1 commands drops through */
default:    /* these are commands 0 (setchar0) thru 127 (setchar 127) */
        mychar = cmd ;
dochar:
/*
 *   We are going to approximate that each string of consecutive characters
 *   requires (length of string) bytes of PostScript VM.
 */
         if (curfnt==NULL)
            error("! Bad DVI file: no font selected") ;
         if (mychar>=curfnt->maxchars) {
            (void)sprintf(errbuf,"! invalid char %d from font %s", mychar, curfnt->name) ;
            error(errbuf) ;
         }
         if (curfnt->loaded == 2) { /* scanning a virtual font character */
            frp->curp = curpos ;
            frp->curl = curlim ;
            frp->ff = ffont ;
            frp->curf = curfnt ;
            if (++frp == &frames[MAXFRAME] )
               error("! virtual recursion stack overflow") ;
            cd = curfnt->chardesc + mychar ;
            if (cd->packptr == 0)
 error("! a non-existent virtual character is being used; check vf/tfm files") ;
            curpos = cd->packptr + 2 ;
            curlim = curpos + (256*(long)(*cd->packptr)+(*(cd->packptr+1))) ;
            ffont = curfnt->localfonts ;
            if (ffont==NULL)
               curfnt = NULL ;
            else if (!preselectfont(ffont->desc))
               goto outofmem ;
         } else {
            pagecost++ ;
            if (!prescanchar(curfnt->chardesc + mychar))
               goto outofmem ;
         }
         break ;        
case 171: case 172: case 173: case 174: case 175: case 176: case 177:
case 178: case 179: case 180: case 181: case 182: case 183: case 184:
case 185: case 186: case 187: case 188: case 189: case 190: case 191:
case 192: case 193: case 194: case 195: case 196: case 197: case 198:
case 199: case 200: case 201: case 202: case 203: case 204: case 205:
case 206: case 207: case 208: case 209: case 210: case 211: case 212:
case 213: case 214: case 215: case 216: case 217: case 218: case 219:
case 220: case 221: case 222: case 223: case 224: case 225: case 226:
case 227: case 228: case 229: case 230: case 231: case 232: case 233:
case 234: case 235: case 236: case 237: case 238: /* font selection commands */
         if (cmd < 235) fnt = cmd - 171 ; /* fntnum0 thru fntnum63 */
         else {
            fnt = dvibyte() ; /* fnt1 */
            while (cmd-- > 235)
               fnt = (fnt << 8) + dvibyte() ;
         }
         for (cfnt=ffont; cfnt; cfnt = cfnt->next)
            if (cfnt->fontnum == fnt) goto fontfound ;
         printf("Font number %d not found\n", fnt) ;
         error("! no font selected") ;
fontfound: curfnt = cfnt->desc ;
         if (!preselectfont(curfnt))
              goto outofmem ;
         break ;
case 239: predospecial((integer)dvibyte(), 1) ; break ; /* xxx1 */
case 240: predospecial((integer)twobytes(), 1) ; break ; /* xxx2 */
case 241: predospecial(threebytes(), 1) ; break ; /* xxx3 */
case 242: predospecial(signedquad(), 1) ; break ; /* xxx4 */
case 243: case 244: case 245: case 246: fontdef(cmd-242) ; break ; /* fntdef1 */
case 140: /* eop or end of virtual char */
         if (curpos) {
            --frp ;
            curfnt = frp->curf ;
            ffont = frp->ff ;
            curlim = frp->curl ;
            curpos = frp->curp ;
            break ;
         }
         goto endofpage ; /* eop */
      }
   }
endofpage:
   if (fontmem > pagecost)
      return(1) ;
   if (pagecount > 0) {
      return(0) ;
    }  /* IBM: color */
#ifdef SHORTINT
      (void)fprintf(stderr, "Page %ld may be too complex to print\n", pagenum) ;
#else   /* ~SHORTINT */
      (void)fprintf(stderr, "Page %d may be too complex to print\n", pagenum) ;
#endif  /* ~SHORTINT */
/*
 *   This case should be rare indeed.  Even with only 200K of virtual memory,
 *   at 11 bytes per char, you can have 18K characters on a page.
 */
   return(2) ;
outofmem:
   if (frp != frames) {
      curpos = frames->curp ;
      curlim = frames->curl ;
      ffont = frames->ff ;
      curfnt = frames->curf ;
   }
   return 0 ;
}

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Variable Documentation

Definition at line 58 of file dvips.c.

Definition at line 54 of file dvips.c.

Definition at line 95 of file dvips.c.

Definition at line 94 of file dvips.c.

Definition at line 199 of file dvips.c.

Definition at line 93 of file dvips.c.

char errbuf[]

Definition at line 42 of file loadfont.c.

Definition at line 96 of file dvips.c.

Definition at line 85 of file dvips.c.

Definition at line 109 of file dvips.c.

Definition at line 179 of file dvips.c.

Definition at line 115 of file dvips.c.

Definition at line 180 of file dvips.c.

Definition at line 110 of file dvips.c.

Definition at line 111 of file dvips.c.