/*
* Main page drawing procedure. Interprets the page commands. A simple
* (if lengthy) case statement interpreter.
*/
#include "dvips.h" /* The copyright notice in that file is included too! */
#include <math.h>
/*
* The external routines we use:
*/
#include "protos.h"
/*
* Now the external variables.
*/
extern fontdesctype *curfnt ;
extern fontdesctype *baseFonts[] ;
extern fontmaptype *ffont ;
extern quarterword *curpos, *curlim ;
extern integer hh, vv ;
extern integer hoff, voff ;
/*
* CONVENTION: conv -> horizontial converter
* vconv -> vertical converter
*/
extern real conv ;
extern real vconv ;
extern FILE *bitfile ;
extern int actualdpi ;
extern int vactualdpi ;
extern frametype frames[] ;
extern int maxdrift ;
extern int vmaxdrift ;
#ifdef XENIX
#define PixRound(x) ((integer)(x + (iconv >> 1)) / iconv)
#define VPixRound(x) ((integer)(x + (viconv >> 1)) / viconv)
#else
#ifdef __THINK__
#define PixRound(x) ((integer)(x + (iconv >> 1)) / iconv)
#define VPixRound(x) ((integer)(x + (viconv >> 1)) / viconv)
#else
#define PixRound(x) ((integer)(floor(((x) * conv) + 0.5)))
#define VPixRound(x) ((integer)(floor(((x) * vconv) + 0.5)))
#endif
#endif
/*
* Now we have the dopage procedure.
* Most error checking is suppressed because the prescan has already
* verified that the DVI data is OK....except for stack over/underflow.
*/
struct dvistack {
integer hh, vv ;
integer h, v, w, x, y, z ;
} stack[STACKSIZE] ;
#ifdef HPS
extern int pagecounter ;
extern Boolean HPS_FLAG ;
extern Boolean inHTMLregion ;
integer vvmem, hhmem ;
integer pushcount = 0 ;
Boolean PAGEUS_INTERUPPTUS = 0 ;
Boolean NEED_NEW_BOX = 0 ;
extern integer HREF_COUNT ;
extern int current_pushcount ;
integer H_BREAK ; /* An empirical parameter for guessing line breaks; needs
dpi dependence */
#endif
void
dopage P1H(void)
{
register shalfword cmd ;
register integer p ;
register chardesctype *cd ;
register integer h ;
register fontmaptype *cfnt ;
register frametype *frp = frames ;
integer fnt ;
#ifdef Omega
integer mychar;
#endif
int charmove ;
struct dvistack *sp = stack ;
integer v, w, x, y, z ;
integer roundpos ;
integer thinspace ;
integer vertsmallspace ;
#ifdef XENIX
integer iconv ;
integer viconv ;
iconv = (integer)(1.0 / conv + 0.5) ;
viconv = (integer)(1.0 / vconv + 0.5) ;
#else
#ifdef __THINK__
integer iconv ;
integer viconv ;
iconv = (integer)(1.0 / conv + 0.5) ;
viconv = (integer)(1.0 / vconv + 0.5) ;
#endif
#endif
#ifdef EMTEX
emclear() ;
#endif
pageinit() ;
bopcolor(1) ;
thinspace = (integer)(0.025*DPI/conv) ; /* 0.025 inches */
vertsmallspace = (integer)(0.025*VDPI/vconv) ; /* 0.025 inches */
#ifdef HPS
if (HPS_FLAG) pagecounter++ ;
H_BREAK = (30 * DPI / 400 ) ; /* 30 seems to have worked well at 400 dpi */
#endif
w = x = y = z = 0 ;
h = DPI / conv * hoff / 4736286.72 ;
v = DPI / conv * voff / 4736286.72 ;
hh = PixRound(h) ;
vv = PixRound(v) ;
curfnt = NULL ;
curpos = NULL ;
charmove = 0 ;
beginloop:
switch (cmd=dvibyte()) {
case 138: goto beginloop ; /* nop command does nuttin */
/*
* For put1 commands, we subtract the width of the character before
* dropping through to the normal character setting routines. This
*/
#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:
#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:
#endif
#ifdef HPS
if (HPS_FLAG && PAGEUS_INTERUPPTUS) {
HREF_COUNT-- ;
start_new_box() ;
PAGEUS_INTERUPPTUS = 0 ;
}
if (HPS_FLAG && NEED_NEW_BOX) {
vertical_in_hps();
NEED_NEW_BOX = 0;
}
#endif
#ifdef Omega
cd = &(curfnt->chardesc[mychar]) ;
#else
cd = &(curfnt->chardesc[cmd]) ;
#endif
if (cd->flags & EXISTS) {
if (curfnt->loaded == 2) { /* virtual character being typeset */
if (charmove) {
sp->hh = hh + cd->pixelwidth ;
sp->h = h + cd->TFMwidth ;
} else {
sp->hh = hh ; sp->h = h ;
}
sp->vv = vv ; sp-> v = v ;
sp->w = w ; sp->x = x ; sp->y = y ; sp->z = z ;
if (++sp >= &stack[STACKSIZE]) error("! Out of stack space") ;
w = x = y = z = 0 ; /* will be in relative units at new stack level */
frp->curp = curpos ;
frp->curl = curlim ;
frp->ff = ffont ;
frp->curf = curfnt ;
if (++frp == &frames[MAXFRAME] )
error("! virtual recursion stack overflow") ;
curpos = cd->packptr + 2 ;
curlim = curpos + (256*(long)(*cd->packptr)+(*(cd->packptr+1))) ;
ffont = curfnt->localfonts ;
if (ffont) {
curfnt = ffont->desc ;
thinspace = curfnt->thinspace ;
} else {
curfnt = NULL ;
thinspace = vertsmallspace ;
}
goto beginloop ;
}
#ifdef Omega
drawchar(cd, mychar) ;
#else
drawchar(cd, cmd) ;
#endif
}
if (charmove) {
h += cd->TFMwidth ;
hh += cd->pixelwidth ;
}
goto setmotion ;
#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 , rxx, ryy ;
ry = signedquad() ; rx = signedquad() ;
if (rx>0 && ry>0) {
if (curpos) {
rx = scalewidth(rx, (frp-1)->curf->scaledsize) ;
ry = scalewidth(ry, (frp-1)->curf->scaledsize) ;
}
rxx = (int)(conv * rx + 0.9999999) ;
ryy = (int)(vconv * ry + 0.9999999) ;
drawrule(rxx, ryy) ;
} else
rxx = 0 ;
if (cmd == 137) goto beginloop ;
h += rx ; hh += rxx ;
goto setmotion ;
}
case 141: /* push */
#ifdef HPS
if (HPS_FLAG) pushcount++ ;
/* if (HPS_FLAG && PAGEUS_INTERUPPTUS) {
HREF_COUNT-- ;
start_new_box() ;
PAGEUS_INTERUPPTUS = 0 ;
} */
if (HPS_FLAG && NEED_NEW_BOX) {
vertical_in_hps();
NEED_NEW_BOX = 0;
}
/* printf("push %i, %i\n", pushcount, inHTMLregion) ; */
#endif
sp->hh = hh ; sp->vv = vv ; 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") ;
goto beginloop ;
case 140: /* eop or end of virtual character */
if (curpos == NULL) { /* eop */
#ifdef HPS
if (HPS_FLAG && inHTMLregion) PAGEUS_INTERUPPTUS = 1 ;
/* printf("Page interrupted"); */
#endif
break;
}
--frp ;
curfnt = frp->curf ;
thinspace = (curfnt) ? curfnt->thinspace : vertsmallspace ;
ffont = frp->ff ;
curlim = frp->curl ;
curpos = frp->curp ;
if (hh < (sp-1)->hh+2 && hh > (sp-1)->hh-2)
(sp-1)->hh = hh; /* retain `intelligence' of pixel width, if close */
/* falls through */
case 142: /* pop */
#ifdef HPS
pushcount-- ;
/* printf("pop %i\n", pushcount) ; */
#endif
if (--sp < stack) error("! More pops than pushes") ;
#ifdef HPS
if (HPS_FLAG) {
hhmem = hh ; vvmem = vv ;
}
#endif
hh = sp->hh ; vv = sp->vv ; h = sp->h ; v = sp->v ;
w = sp->w ; x = sp->x ; y = sp->y ; z = sp->z ;
#ifdef HPS
if (HPS_FLAG && inHTMLregion && (hhmem - hh > H_BREAK) && (pushcount > 0) &&
(pushcount < current_pushcount))
end_current_box() ;
#endif
goto beginloop ;
case 143: /* right1 */
p = signedbyte() ; goto horizontalmotion ;
case 144: /* right2 */
p = signedpair() ; goto horizontalmotion ;
case 145: /* right3 */
p = signedtrio() ; goto horizontalmotion ;
case 146: /* right4 */
p = signedquad() ; goto horizontalmotion ;
case 147: /* w0 */
p = w ; goto horizontalmotion ;
case 148: /* w1 */
p = w = signedbyte() ; goto horizontalmotion ;
case 149: /* w2 */
p = w = signedpair() ; goto horizontalmotion ;
case 150: /* w3 */
p = w = signedtrio() ; goto horizontalmotion ;
case 151: /* w4 */
p = w = signedquad() ; goto horizontalmotion ;
case 152: /* x0 */
p = x ; goto horizontalmotion ;
case 153: /* x1 */
p = x = signedbyte() ; goto horizontalmotion ;
case 154: /* x2 */
p = x = signedpair() ; goto horizontalmotion ;
case 155: /* x3 */
p = x = signedtrio() ; goto horizontalmotion ;
case 156: /* x4 */
p = x = signedquad() ; goto horizontalmotion ;
case 157: /* down1 */
p = signedbyte() ; goto verticalmotion ;
case 158: /* down2 */
p = signedpair() ; goto verticalmotion ;
case 159: /* down3 */
p = signedtrio() ; goto verticalmotion ;
case 160: /* down4 */
p = signedquad() ; goto verticalmotion ;
case 161: /* y0 */
p = y ; goto verticalmotion ;
case 162: /* y1 */
p = y = signedbyte() ; goto verticalmotion ;
case 163: /* y2 */
p = y = signedpair() ; goto verticalmotion ;
case 164: /* y3 */
p = y = signedtrio() ; goto verticalmotion ;
case 165: /* y4 */
p = y = signedquad() ; goto verticalmotion ;
case 166: /* z0 */
p = z ; goto verticalmotion ;
case 167: /* z1 */
p = z = signedbyte() ; goto verticalmotion ;
case 168: /* z2 */
p = z = signedpair() ; goto verticalmotion ;
case 169: /* z3 */
p = z = signedtrio() ; goto verticalmotion ;
case 170: /* z4 */
p = z = signedquad() ; goto verticalmotion ;
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() ;
}
if (curpos || fnt > 255) {
for (cfnt=ffont; cfnt; cfnt = cfnt->next)
if (cfnt->fontnum == fnt) break ;
curfnt = cfnt->desc ;
} else
curfnt = baseFonts[fnt] ;
thinspace = curfnt->thinspace ;
goto beginloop ;
case 243: case 244: case 245: case 246: /*fntdef1 */
skipover(cmd - 230) ;
skipover(dvibyte() + dvibyte()) ;
goto beginloop ;
case 239: /* xxx1 */
p = dvibyte() ;
dospecial(p) ;
goto beginloop ;
case 240: /* xxx2 */
p = twobytes() ;
dospecial(p) ;
goto beginloop ;
case 241: /* xxx3 */
p = threebytes() ;
dospecial(p) ;
goto beginloop ;
case 242: /* xxx4 */
p = signedquad() ;
dospecial(p) ;
goto beginloop ;
/*
* The calculations here are crucial to the appearance of the document.
* If the motion is small, we round the amount of relative motion; otherwise,
* we update the position and round the new position. Then we check to
* insure that the rounded position didn't accumulate an error that was
* greater than maxdrift.
*/
verticalmotion:
/* vertical motion cases */
if (curpos)
p = scalewidth(p, (frp-1)->curf->scaledsize) ;
v += p ;
if (p >= vertsmallspace) vv = VPixRound(v) ;
else if (p <= -vertsmallspace) vv = VPixRound(v) ;
else
{ vv += VPixRound(p) ;
roundpos = VPixRound(v) ;
if (roundpos - vv > vmaxdrift) vv = roundpos - vmaxdrift ;
else if (vv - roundpos > vmaxdrift) vv = roundpos + vmaxdrift ;
}
#ifdef HPS
/* printf("Doing vertical motion: p = %i, v = %i, vv = %i\n",p,v,vv); */
/* printf("inHTMLregion %i\n", inHTMLregion) ; */
if (HPS_FLAG && inHTMLregion) NEED_NEW_BOX = 1 /* vertical_in_hps() */;
#endif
goto beginloop ;
/*
* Horizontal motion is analogous. We know the exact width of each
* character in pixels. Kerning is distinguished from space between
* words if it's less than a thinspace and not more negative than would
* occur when an accent is being positioned by backspacing.
*/
horizontalmotion:
/* horizontal motion cases */
if (curpos)
p = scalewidth(p, (frp-1)->curf->scaledsize) ;
h += p ;
if (p >= thinspace || p <= -6 * thinspace) {
hh = PixRound(h) ; goto beginloop ;
}
else hh += PixRound(p) ;
#ifdef HPS
/* printf("Doing horizontal motion: p = %i, h = %i, hh = %i\n",p,h,hh); */
#endif
setmotion:
roundpos = PixRound(h) ;
if (roundpos - hh > maxdrift) { hh = roundpos - maxdrift ; }
else if (hh - roundpos > maxdrift) { hh = roundpos + maxdrift ; }
goto beginloop ;
} /* end of the big switch */
pageend() ;
}
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