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/*
* Calculates the bounding box for a one-page .dvi file.
* Based on a lot of other dvips stuff. Requires a total re-scan
* of the page.
*
* If you request an EPSF file and specify -a, you may end up
* processing a single page four times!
*/
#include "dvips.h"
#include <math.h>
#include "protos.h"
extern char *nextstring, errbuf[] ;
extern FILE *tfmfile, *dvifile ;
extern fontdesctype *baseFonts[] ;
extern integer firstboploc, num, den ;
extern double mag ;
extern integer hoff, voff ;
typedef struct {
integer llx, lly, urx, ury ;
} bbchardesctype ;
typedef struct {
bbchardesctype bbchardesc[256] ;
} bbfontdesctype ;
static bbfontdesctype *bbaseFonts[256] ;
integer nscalewidth P2C(register integer, a, register integer, b)
{
if (a < 0)
return - nscalewidth(-a, b) ;
else if (b < 0)
return - scalewidth(a, -b) ;
else
return scalewidth(a, b) ;
}
void bbtfmload P1C(int, n)
{
register shalfword i ;
register integer li ;
integer scaledsize ;
shalfword nw, nh, nd, ns, hd ;
shalfword bc, ec ;
integer scaled[300] ;
integer chardat[256] ;
integer slant = 0 ;
bbchardesctype *cc ;
register fontdesctype *curfnt = baseFonts[n] ;
register bbfontdesctype *bbcurfnt =
(bbfontdesctype *)mymalloc(sizeof(bbfontdesctype)) ;
bbaseFonts[n] = bbcurfnt ;
tfmopen(curfnt) ;
/*
* Next, we read the font data from the tfm file, and store it in
* our own arrays.
*/
li = tfm16() ; hd = tfm16() ;
bc = tfm16() ; ec = tfm16() ;
nw = tfm16() ; nh = tfm16() ; nd = tfm16() ;
ns = tfm16() ;
ns += tfm16() ;
ns += tfm16() ;
ns += tfm16() ;
li = tfm16() ;
li = tfm32() ;
check_checksum (li, curfnt->checksum, curfnt->name);
li = tfm32() ;
for (i=2; i<hd; i++)
li = tfm32() ;
for (i=0; i<256; i++)
chardat[i] = -1 ;
for (i=bc; i<=ec; i++) {
chardat[i] = tfm16() ;
li = tfm16() ;
}
scaledsize = curfnt->scaledsize ;
for (i=0; i<nw + nh + nd; i++)
scaled[i] = scalewidth(tfm32(), scaledsize) ;
for (i=0; i<ns; i++)
tfm32() ;
slant = tfm32() ;
(void)fclose(tfmfile) ;
for (i=0; i<256; i++) {
cc = &(bbcurfnt->bbchardesc[i]) ;
if (chardat[i] != -1) {
cc->ury = scaled[((chardat[i] >> 4) & 15) + nw] ;
cc->lly = - scaled[(chardat[i] & 15) + nw + nh] ;
cc->llx = 0 ;
cc->urx = curfnt->chardesc[i].TFMwidth ;
} else {
cc->llx = cc->lly = cc->urx = cc->ury = 0 ;
}
}
if (slant) {
for (i=0; i<256; i++) {
cc = &(bbcurfnt->bbchardesc[i]) ;
cc->llx += nscalewidth(cc->lly, slant) ;
cc->urx += nscalewidth(cc->ury, slant) ;
}
}
}
extern struct dvistack {
integer hh, vv ;
integer h, v, w, x, y, z ;
} stack[] ;
static integer llx, lly, urx, ury ;
void bbspecial P3C(integer, h, integer, v, int, nbytes)
{
float *r = bbdospecial(nbytes) ;
if (r) {
/* convert from magnified PostScript units back to scaled points */
real conv = 72.0 * (real)num / (real)den * (real)mag / 254000000.0 ;
if (llx > h + r[0] / conv)
llx = h + r[0] / conv ;
if (lly > v - r[3] / conv)
lly = v - r[3] / conv ;
if (urx < h + r[2] / conv)
urx = h + r[2] / conv ;
if (ury < v - r[1] / conv)
ury = v - r[1] / conv ;
}
}
void bbdopage()
{
register shalfword cmd ;
register bbchardesctype *bcd ;
register chardesctype *cd ;
register integer h ;
integer fnt ;
#ifdef Omega
integer mychar ;
#endif
int charmove ;
struct dvistack *sp = stack ;
integer v, w, x, y, z ;
register fontdesctype *curfnt = 0 ;
register bbfontdesctype *bbcurfnt = 0 ;
w = x = y = z = 0 ;
h = 0 ; v = 0 ;
llx = lly = 1000000000 ;
urx = ury = -1000000000 ;
charmove = 0 ;
while (1) {
switch (cmd=dvibyte()) {
case 138: break ;
#ifdef Omega
case 134: /* put2 */
mychar = dvibyte() ;
mychar = (mychar << 8) + dvibyte() ;
charmove = 0 ;
goto dochar ;
case 133: /* put1 */
mychar = dvibyte() ;
charmove = 0 ;
goto dochar ;
case 129: /* set2 */
mychar = dvibyte() ;
mychar = (mychar << 8) + dvibyte() ;
charmove = 1;
goto dochar ;
case 128: /* set1 */
mychar = dvibyte() ;
charmove = 1;
goto dochar ;
default: /* these are commands 0 (setchar0) thru 127 (setchar127) */
mychar = cmd ;
charmove = 1 ;
dochar:
cd = &(curfnt->chardesc[mychar]) ;
bcd = &(bbcurfnt->bbchardesc[mychar]) ;
if (h + bcd->llx < llx) llx = h + bcd->llx ;
if (h + bcd->urx > urx) urx = h + bcd->urx ;
if (v - bcd->ury < lly) lly = v - bcd->ury ;
if (v - bcd->lly > ury) ury = v - bcd->lly ;
#else
case 133: /* put1 */
cmd = dvibyte() ;
charmove = 0 ;
goto dochar ;
case 128: cmd = dvibyte() ; /* set1 command drops through to setchar */
default: /* these are commands 0 (setchar0) thru 127 (setchar127) */
charmove = 1 ;
dochar:
cd = &(curfnt->chardesc[cmd]) ;
bcd = &(bbcurfnt->bbchardesc[cmd]) ;
if (h + bcd->llx < llx) llx = h + bcd->llx ;
if (h + bcd->urx > urx) urx = h + bcd->urx ;
if (v - bcd->ury < lly) lly = v - bcd->ury ;
if (v - bcd->lly > ury) ury = v - bcd->lly ;
#endif
if (charmove)
h += cd->TFMwidth ;
break ;
#ifdef Omega
case 130: case 131: case 135: case 136: case 139:
#else
case 129: case 130: case 131: case 134: case 135: case 136: case 139:
#endif
case 247: case 248: case 249: case 250: case 251: case 252: case 253:
case 254: case 255: /* unimplemented or illegal commands */
error("! synch") ;
case 132: case 137: /* rules */
{ integer ry, rx ;
ry = signedquad() ; rx = signedquad() ;
if (rx>0 && ry>0) {
if (h < llx) llx = h ;
if (v - ry < lly) lly = v - ry ;
if (h + rx > urx) urx = h + rx ;
if (v > ury) ury = v ;
} else
rx = 0 ;
if (cmd != 137)
h += rx ;
break ;
}
case 141: /* push */
sp->h = h ; sp->v = v ;
sp->w = w ; sp->x = x ; sp->y = y ; sp->z = z ;
if (++sp >= &stack[STACKSIZE]) error("! Out of stack space") ;
break ;
case 140: /* eop or end of virtual character */
return ;
case 142: /* pop */
if (--sp < stack) error("! More pops than pushes") ;
h = sp->h ; v = sp->v ;
w = sp->w ; x = sp->x ; y = sp->y ; z = sp->z ;
break ;
case 143: h += signedbyte() ; break ;
case 144: h += signedpair() ; break ;
case 145: h += signedtrio() ; break ;
case 146: h += signedquad() ; break ;
case 147: h += w ; break ;
case 148: h += (w = signedbyte()) ; break ;
case 149: h += (w = signedpair()) ; break ;
case 150: h += (w = signedtrio()) ; break ;
case 151: h += (w = signedquad()) ; break ;
case 152: h += x ; break ;
case 153: h += (x = signedbyte()) ; break ;
case 154: h += (x = signedpair()) ; break ;
case 155: h += (x = signedtrio()) ; break ;
case 156: h += (x = signedquad()) ; break ;
case 157: v += signedbyte() ; break ;
case 158: v += signedpair() ; break ;
case 159: v += signedtrio() ; break ;
case 160: v += signedquad() ; break ;
case 161: v += y ; break ;
case 162: v += (y = signedbyte()) ; break ;
case 163: v += (y = signedpair()) ; break ;
case 164: v += (y = signedtrio()) ; break ;
case 165: v += (y = signedquad()) ; break ;
case 166: v += z ; break ;
case 167: v += (z = signedbyte()) ; break ;
case 168: v += (z = signedpair()) ; break ;
case 169: v += (z = signedtrio()) ; break ;
case 170: v += (z = signedquad()) ; 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() ;
while (cmd-- > 235)
fnt = (fnt << 8) + dvibyte() ;
}
curfnt = baseFonts[fnt] ;
bbcurfnt = bbaseFonts[fnt] ;
if (bbcurfnt == 0) {
bbtfmload(fnt) ;
bbcurfnt = bbaseFonts[fnt] ;
}
break ;
case 243: case 244: case 245: case 246: /*fntdef1 */
skipover(cmd - 230) ;
skipover(dvibyte() + dvibyte()) ;
break ;
case 239: bbspecial(h, v, (int)dvibyte()) ; break ;
case 240: bbspecial(h, v, (int)twobytes()) ; break ;
case 241: bbspecial(h, v, (int)threebytes()) ; break ;
case 242: bbspecial(h, v, (int)signedquad()) ; break ;
}
}
}
void findbb P1C(integer, bop)
{
integer curpos = ftell(dvifile) ;
real conv = 72.0 * (real)num / (real)den * (real)mag / 254000000.0 ;
real off = 72.0 / conv ;
real margin = 1.0 / conv ;
real vsize = 792.0 / conv ;
real hadj = -72.0 * hoff / 4736286.72 ;
real vadj = 72.0 * voff / 4736286.72 ;
fseek(dvifile, bop, 0) ;
bbdopage() ;
fseek(dvifile, curpos, 0) ;
lly = vsize - 2 * off - lly ;
ury = vsize - 2 * off - ury ;
llx = (int)floor((llx + off - margin) * conv - hadj + 0.5) ;
lly = (int)floor((lly + off + margin) * conv - vadj + 0.5) ;
urx = (int)floor((urx + off + margin) * conv - hadj + 0.5) ;
ury = (int)floor((ury + off - margin) * conv - vadj + 0.5) ;
/* no marks on the page? */
if (llx >= urx || lly <= ury)
llx = lly = urx = ury = 72 ;
#ifdef SHORTINT
sprintf(nextstring, "%ld %ld %ld %ld", llx, ury, urx, lly) ;
#else
sprintf(nextstring, "%d %d %d %d", llx, ury, urx, lly) ;
#endif
}
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