Category : EmTeX is a TeX/LaTeX document editor
Archive   : DVIPS54.ZIP
Filename : TFMLOAD.C

/*
* Loads a tfm file. It marks the characters as undefined.
*/
#include "structures.h" /* The copyright notice in that file is included too! */
/*
* These are the external routines it calls:
*/
extern void error() ;
extern integer scalewidth() ;
extern FILE *search() ;
/*
* Here are the external variables we use:
*/
extern real conv ;
extern real vconv ;
extern real alpha ;
extern char *tfmpath ;
extern char errbuf[] ;
extern integer fsizetol ;
/*
* Our static variables:
*/
static FILE *tfmfile ;
static char name[50] ;

/*
* Tries to open a tfm file. Aborts job if unsuccessful.
*/
void
tfmopen(fd)
register fontdesctype *fd ;
{
register char *d, *n ;

d = fd->area ;
n = fd->name ;
if (*d==0)
d = tfmpath ;
(void)sprintf(name, "%s.tfm", n) ;
if ((tfmfile=search(d, name, READBIN))==NULL) {
(void)sprintf(errbuf, "! Can't open font metric file %s%s",
fd->area, name) ;
error(errbuf) ;
}
}

shalfword
tfmbyte ()
{
return(getc(tfmfile)) ;
}

halfword
tfm16 ()
{
register halfword a ;
a = tfmbyte () ;
return ( a * 256 + tfmbyte () ) ;
}

integer
tfm32 ()
{
register integer a ;
a = tfm16 () ;
if (a > 32767) a -= 65536 ;
return ( a * 65536 + tfm16 () ) ;
}

void
tfmload(curfnt)
register fontdesctype *curfnt ;
{
register shalfword i ;
register integer li ;
integer scaledsize ;
shalfword nw, hd ;
shalfword bc, ec ;
integer scaled[256] ;
halfword chardat[256] ;

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() ;
li = tfm32() ; li = tfm32() ; li = tfm32() ; li = tfm16() ;
li = tfm32() ;
if (li && curfnt->checksum)
if (li!=curfnt->checksum) {
(void)sprintf(errbuf,"Checksum mismatch in %s", name) ;
error(errbuf) ;
}
li = (integer)(alpha * (real)tfm32()) ;
if (li > curfnt->designsize + fsizetol ||
li < curfnt->designsize - fsizetol) {
(void)sprintf(errbuf,"Design size mismatch in %s", name) ;
error(errbuf) ;
}
for (i=2; i li = tfm32() ;
for (i=0; i<256; i++)
chardat[i] = 256 ;
for (i=bc; i<=ec; i++) {
chardat[i] = tfmbyte() ;
li = tfm16() ;
li = tfmbyte() ;
}
scaledsize = curfnt->scaledsize ;
for (i=0; i scaled[i] = scalewidth(tfm32(), scaledsize) ;
(void)fclose(tfmfile) ;
for (i=0; i<256; i++)
if (chardat[i]!= 256) {
li = scaled[chardat[i]] ;
curfnt->chardesc[i].TFMwidth = li ;
curfnt->chardesc[i].pixelwidth = ((integer)(conv*li+0.5)) ;
curfnt->chardesc[i].flags = (curfnt->resfont ? EXISTS : 0) ;
}
curfnt->loaded = 1 ;
}