⟦a7d4972ca⟧

TextFile

/* This file contains those portions of Ln03DVI that create
font loads. It is still being developed... 

Copyright (c) 1983, 1984, 1985, 1986, 1987 by Digital Equipment
Corporation. Author: Flavio Rose,
...!decwrl!dec-rhea!dec-dvinci!rose. 

This version of Ln03DVI is maintained by Matt Thomas.  
Please send all bug reports to either:
    ...!decwrl!thebay.dec.com!mthomas (UUCP)
    mthomas@thebay.dec.com (Internet)

Development chronology: 

11/28/84: Initial version in PL/I. Finished 11/30/84.
  3/4/85: C translation, a prelude to writing DVI2LN3.
  5/7/85: Finally got around to debugging the C translation!
  6/5/85: Convert to work with Dvi2ln3 -- minor changes.
 6/18/85: Try not to use big input array.
 6/22/85: Cleanup, try to identify longs.
11/12/85: Changed to read PXLs rather than LN03 format files. Old file
    	  called dvi2ln3nft, now renamed to dvi2ln3pxl.
11/15/85: More optimized PXL reading -- use lnf instead of the pxlbuf
    	  when reading rasters. Return just status value from add_txf_...,
    	  use ras_len_added to communicate size. Facilitate error
    	  recovery with copy_ersatz_char. LN03 file reading functionality
    	  woven back in.
 1/16/86: Embarrassing bug, forgot to close the nftf after done with it.
 3/28/86: Conditionalization for Ultrix.
  4/7/86: After moving this to 4.3bsd at MIT, a couple more 
    	  fixes to the portability.
  8/6/86: Try to make changes for Apollo. No way to test 
    	  them. #ifdef Apollo ... #endif
 11/5/86: Add error message giving PXL extension if no PXL 
    	  file can be found.     
 2/20/87: Add support for reading of PK files.  Reorganize output to be
          simpler.  Change name to Ln03DVI.
  5/5/87: Misc fixups relating to the CM fonts.  COnditionalize some code, etc.
 5/15/87: Fix NFT filename problem (accvio under VMS).  cleaup some error
	  messages.
*/

/* INTRODUCTION: When writing an LN03 driver for TeX, it
must be kept in mind that the LN03 has limited font storage
capability. The standard LN03 has just 27k bytes, and two
128k byte RAM cartridges may be added. 

For this reason, when we convert a DVI file to LN03 form, we
build a special font load that has just the glyphs that the
DVI file needs. This allows very complex files, e.g. the
first nine chapters of the Metafontbook, to be printed on
LN03s that have just one extra RAM cartridge. This approach
does, however, consume considerable resources in the VAX to
build those font loads. */ 

/* The following is customary boilerplate. */ 

#ifdef vms
#include stdio
#include errno
#else
#include <stdio.h>
#include <errno.h>
#endif
#include "pk.h"

/* In VMS we declare external variables to be globalref. 
This is not really necessary, just an old habit. */

#ifdef vms
#define GLOBAL globaldef
#define EXTERN globalref
#else
#define GLOBAL 
#define EXTERN extern
#endif

/*  errno is declared in errno.h under VMS and System V but
not under BSD 4.2.  Also we use strchr instead of index so
we conditionalize that too. */

#ifdef bsd4_2

# define index strchr
extern int errno;

#endif


/* The following symbols are declared compatibly with those
in the file Ln03DVI.c. */ 

#define maxnfonts 31
#define MAXTEXFONTS 100
#define FILESPECLEN 252
#define leftfirst 33
#define leftlast 126
#define rightfirst 161
#define rightlast 254

EXTERN FILE *outfile;
EXTERN int lastch[maxnfonts];
EXTERN unsigned char chw[maxnfonts][256];

struct txf { unsigned char chu[256]; int bc, ec; long space, design_size,
    scaled_size; int nchs; };
EXTERN struct txf *txfa[MAXTEXFONTS+1];
EXTERN long int *font_width[MAXTEXFONTS+1];

EXTERN char *font_name[MAXTEXFONTS+1];
EXTERN double conv, unmag_conv;

#ifndef vms
char *getenv();
#endif 

/* The LN03 font load we build is buffered in a fixed-size
area, slightly smaller than the maximum amount of font
memory available on an LN03. [[The code should be changed to
chain fixed-size buffers, so font loads of unlimited size
can be handled, subject only to memory availability. On
systems with limited memory, it may be desirable to use a
disk file instead of this buffer.]] */ 

#define OBUFLEN 2*256*256
GLOBAL unsigned char lnf[OBUFLEN]; 

/* While constructing the font load, we keep track of the
length of the "character definitions area" in ras_len. We
also have to keep track of the raster size measured in three
different ways, as psize (portrait), lsize (landscape), and
msize (mixed). This is required to fill certain fields in
the font load. */ 

GLOBAL long int ras_len,psize,lsize,msize; 

/* The font load that we construct consists of a number of
LN03 fonts. Each of these contains up to 94 glyphs. They may
be "left fonts", so their glyphs are invoked with codes 33
through 126; or they may be "right fonts" that respond to
codes 161 through 254. 

The font load that we construct is made up of alternating
left and right fonts (sometimes called "font pairs"). A TeX
font (represented by a txf record) is added to a font pair.
It may be split between the left and right halves of the
pair. 

The variable using_r keeps track of whether we are using a
right font. */ 

GLOBAL char using_r; 

GLOBAL unsigned int nft_first_ch,nft_last_ch,chardir_offset;
GLOBAL int lnf_chardir,ras_beg;
GLOBAL long ras_len_added; 

GLOBAL int pxlf,nftf;
GLOBAL PKFont *pkfont;

/* The purpose of add_txf_to_lnf is to read the PXL, PK, or LN03
font file corresponding to TeX font txfno and add its
rasters to the font pair referred to by lnfno. The function
returns 0 if all went well, and various negative numbers to
indicate problems. The number of bytes added to the font
load is returned in the global ras_len_added. */ 

int add_txf_to_lnf(lnfno,txfno)
int lnfno,txfno;
{
    int i,j,k,l,width;
    int first_txfc,last_txfc;
    char first_txf,last_txf;

    ras_len_added = 0;

    if (txfno < 0 || txfno > MAXTEXFONTS || txfa[txfno] == 0  ||
     	lnfno < 0 || lnfno > maxnfonts) {
	fprintf(stderr,"\nLn03DVI internal error, bad txfno or lnfno\n");
     	goto error_return;
    } 

/* Now, compute first_txfc and last_txfc, the first and last
characters codes to be copied from the TeX font. */ 

    first_txfc = -1; last_txfc = -1;
    for (i=0; i<256; i++) {
	if (txfa[txfno] -> chu[i] != 0) {
	    if (first_txfc == -1)  first_txfc = i;
	    last_txfc = i;
	}
    }
    if (first_txfc == -1 || last_txfc == -1) return(0);

/* Tell user what font is being loaded */

    printf("Font %s:\t",font_name[txfno]);
    k = (1500.0*conv*txfa[txfno] -> scaled_size)/
	    (unmag_conv*txfa[txfno] -> design_size) + 0.5;
    l = ((float)k)/15.0 + 0.5;
    if (l != 100) printf("magnified %d%%, ",l);
    fflush(stdout);

/* Now open the file from which we are getting rasters. We
look first for a PK file, the for a PXL file, and finally for a
LN03 format font file (NFT file). */

    pkfont = NULL;
    pxlf = -1;
    nftf = -1;
    open_pk_file(txfno);
    if (pkfont == NULL) open_pxl_file(txfno);
    if (pkfont == NULL && pxlf == -1) open_nft_file(txfno);

/* If neither a PXL file nor a PK file nor an LN03 format 
file could be opened, warn the user. The font load will be 
filled in with blanks nonetheless. */ 

    if (pxlf == -1 && pkfont == NULL && nftf == -1) {
	printf("not available, loading blanks, ");
	fflush(stdout);
    }

/* Now replace first_txfc and last_txfc by the character
codes into which they are going to be copied. */ 

    first_txfc = txfa[txfno] -> chu[first_txfc];
    last_txfc = txfa[txfno] -> chu[last_txfc];

/* Determine if this is the first or last TeX font that is
being copied into the current LN03 font pair. */ 

    first_txf = (first_txfc == leftfirst);
    last_txf = (last_txfc == lastch[lnfno]);

/* If this is the first TeX font for the current LN03 font
pair, then we have to initialize the LN03 font load buffer.
The initialization routine computes where the rasters begin
in the output buffer, puts in the blanks, etc. */ 

    if (first_txf) {
    	using_r = 0;
    	initialize_lnf(lnfno);
    }

/* Now go through all the characters in the TeX font and
copy their rasters into the appropriate positions in the
LN03 font pair. When we copy the the last rasters into the
left font, we write the font out and then a comma to
separate it from the next font. [[Fencepost error?]] */ 

    for (i=0; i<256; i++) {
    	if (txfa[txfno] -> chu[i] != 0) {
    	    j = txfa[txfno] -> chu[i];
    	    if (!using_r && j >= rightfirst) {
    		write_lnf();
    		fprintf(outfile,"\n,");
    		using_r = 1;
    		initialize_lnf(lnfno);
    	    }
    	    if (pxlf != -1) {
    		k = copy_pxl_char(i,j,lnfno);
    		if (k != 0) {
    		    close(pxlf);
    		    pxlf = -1;
    		}
    	    } else if (nftf != -1) {
    		k = copy_nft_char(i,j,lnfno);
    		if (k != 0) {
    		    close(nftf);
    		    nftf = -1;
    		}
    	    } else if (pkfont != NULL) {
		k = copy_pk_char(pkfont,i,txfno,j,lnfno);
		if  (k != 0) {
		    PKUnloadFont(pkfont);
		    pkfont = NULL;
		}
	    }
    	    if (pxlf == -1 && pkfont == NULL && nftf == -1) {
    		width = font_width[txfno][i]*conv+0.5;
    		k = copy_ersatz_char(j,lnfno,width);
    	    }
	}
    }

    if (nftf != -1) close(nftf);
    if (pxlf != -1) close(pxlf);
    if (pkfont != NULL) PKUnloadFont(pkfont);

/* Type and return the incremental amount of space that the
TeX font being added takes up in the output font load. */ 

    ras_len_added += 4*(txfa[txfno] -> nchs);
    printf("%d bytes\n",ras_len_added);

/* If this is the last TeX font being added to this LN03
font pair, write out the current font (right or left) from
the pair. */ 

    if (last_txf) write_lnf(); 
    
    return(0);

error_return: 
    return(-1);

}

/* A buffer is used to hold the directory part of the PXL file. */

#define PXLBUFSIZE 4*517

GLOBAL unsigned char pxlbuf[PXLBUFSIZE];
GLOBAL long pxllen;

/* The value pxlconv is computed to be the correct
conversion factor from the widths in the PXL file, which are
expressed in units of 2^-20 times the design size, to
pixels. */ 

GLOBAL float pxlconv;

/* As usual when dealing with TeX files, we have to
rearrange bytes in an overlay to combine them into
longwords. The reason for this is that bytes in TeX files
are combined into longwords the opposite way from how the
VAX combines them. 

Hence, the following overlay and macro: */

GLOBAL union lc { unsigned long int ul; 
    long int l;
    unsigned char c[4]; } lcy;

#ifdef BIG_ENDIAN
#define copy_from_lnf(i) lcy.c[3] = lnf[i]; lcy.c[2] = lnf[i+1]; \
    lcy.c[1] = lnf[i+2]; lcy.c[0] = lnf[i+3]
#define copy_to_lnf(i) lnf[i] =  lcy.c[3]; lnf[i+1] = lcy.c[2]; \
    lnf[i+2] = lcy.c[1] ; lnf[i+3] = lcy.c[0] 
#define copy_from_pxl(_x) { lcy.c[0] = pxlbuf[_x]; \
    lcy.c[1] = pxlbuf[(_x)+1]; lcy.c[2] = pxlbuf[(_x)+2]; \
    lcy.c[3] = pxlbuf[(_x)+3]; }
#else   /* not big endian */
#define copy_from_lnf(i) lcy.c[0] = lnf[i]; lcy.c[1] = lnf[i+1]; \
    lcy.c[2] = lnf[i+2]; lcy.c[3] = lnf[i+3]
#define copy_to_lnf(i) lnf[i] =  lcy.c[0]; lnf[i+1] = lcy.c[1]; \
    lnf[i+2] = lcy.c[2] ; lnf[i+3] = lcy.c[3] 
#define copy_from_pxl(_x) { lcy.c[3] = pxlbuf[_x]; \
    lcy.c[2] = pxlbuf[(_x)+1]; lcy.c[1] = pxlbuf[(_x)+2]; \
    lcy.c[0] = pxlbuf[(_x)+3]; }
#endif


/* open_pxl_file reads the last 517 longwords of the PXL
file into the pxlbuf. */ 

int open_pxl_file(txfno) 
int txfno;
{

    long i,j;
    float two_to_the_20th = 0x100000;
    int k,l,jnam,jext,target;
    char fullspec[FILESPECLEN];
#ifndef vms
    char *pxldir;
#endif

    find_filename(font_name[txfno],&jnam,&jext);
    
    fullspec[0] = '\0';
#ifdef vms
    if (jnam == 0) strcpy(fullspec,"TEX$PXLDIR:");
#else
    if (jnam == 0) {
#ifndef Apollo
    	pxldir = getenv("TEXPXLDIR");
	if  (pxldir == NULL)
	    pxldir = "/usr/lib/tex/pxldir";
#else
    	pxldir = "/usr/lib/tex/pxl";
#endif
	strcpy(fullspec,pxldir);
	if  (fullspec[strlen(fullspec)-1] != '/')
	    strcat(fullspec,"/");
    }
#endif
    strcat(fullspec,font_name[txfno]);

    l = 1000.0 * ( (float) txfa[txfno]->scaled_size / 
		(float) txfa[txfno]->design_size ) + 0.5;
    k = 0.5 + 1.5 * (conv / unmag_conv ) * (float) l ;

    l = strlen(fullspec);
    sprintf(&fullspec[l],".%dpxl\0",k);

    pxllen = 0;
    pxlf = open(fullspec,0);
    if (pxlf == -1) return(1);
    printf("loading PXL file %s%s, ",font_name[txfno],&fullspec[l]);
    fflush(stdout);

    lseek(pxlf,-517*4,2);
    i = read(pxlf,pxlbuf,517*4);
    if (i != 517*4) {
	if  (i < 0)  {
	    fflush(stdout);
	    perror("error");
	    printf("\t\t");
	} else
	    printf("error: premature EOF (%d)\n\t\t",i);
	close(pxlf);
    	pxlf = -1;
	return(1);
    }
    pxllen = 4*517;

/* Now that we have read the PXL file, check that it is in
correct format by looking for a trailing ID byte of 1001. */

    copy_from_pxl(pxllen-4);
    if (lcy.ul != 1001) {
	printf("error: invalid .PXL id %d\n\t\t",lcy.ul);
	close(pxlf);
	pxlf = -1;
	return(1);
    }

/* If the format is correct, derive a scale factor for the
widths. */ 

    copy_from_pxl(pxllen-12);
    pxlconv = lcy.ul;
    copy_from_pxl(pxllen-16);
    pxlconv = (pxlconv/two_to_the_20th)*(lcy.ul/5.0)
    	*(1.0/(72.27*two_to_the_20th));
/*    printf( "pxlconv=%g, ",pxlconv ); fflush(stdout); /**/

    return(0);

}

GLOBAL unsigned char rev_byte[256] = {
    0,128,64,192,32,160,96,224,
    16,144,80,208,48,176,112,240,
    8,136,72,200,40,168,104,232,
    24,152,88,216,56,184,120,248,
    4,132,68,196,36,164,100,228,
    20,148,84,212,52,180,116,244,
    12,140,76,204,44,172,108,236,
    28,156,92,220,60,188,124,252,
    2,130,66,194,34,162,98,226,
    18,146,82,210,50,178,114,242,
    10,138,74,202,42,170,106,234,
    26,154,90,218,58,186,122,250,
    6,134,70,198,38,166,102,230,
    22,150,86,214,54,182,118,246,
    14,142,78,206,46,174,110,238,
    30,158,94,222,62,190,126,254,
    1,129,65,193,33,161,97,225,
    17,145,81,209,49,177,113,241,
    9,137,73,201,41,169,105,233,
    25,153,89,217,57,185,121,249,
    5,133,69,197,37,165,101,229,
    21,149,85,213,53,181,117,245,
    13,141,77,205,45,173,109,237,
    29,157,93,221,61,189,125,253,
    3,131,67,195,35,163,99,227,
    19,147,83,211,51,179,115,243,
    11,139,75,203,43,171,107,235,
    27,155,91,219,59,187,123,251,
    7,135,71,199,39,167,103,231,
    23,151,87,215,55,183,119,247,
    15,143,79,207,47,175,111,239,
    31,159,95,223,63,191,127,255
    };

#define pxl_word(_x) (pxlbuf[_x]*256+pxlbuf[(_x)+1])
#define signed_pxl_word(_x) ((pxl_word(_x)>0x8000) ? \
    (pxl_word(_x)-0x10000) : pxl_word(_x))

/* Copy_pxl_char copies the rasters and character directory
information corresponding to code from in the PXL file, into
the to position of the LN03 font load buffer. */ 

int copy_pxl_char(from,to,lnfno)
unsigned char from,to;
int lnfno;
{

    unsigned long ds,rs,i,j,def_start;
    unsigned int rows,cols,k,l,m,n;
    int xoffset, yoffset;
    int width;
    char all_blank;

/* Check if the character code from is in the right range
for the PXL file. */ 

    if (from > 127) return(1);

/* Locate the definition and the rasters for from in the PXL
file. */ 

    ds = 16*from;
    copy_from_pxl(ds+8);
    rs = 4*lcy.ul;
    cols = pxl_word(ds); rows = pxl_word(ds+2);

/* If a glyph has no rasters, an "undocumented feature" of
the LN03 seems to cause the glyph to be printed incorrectly.
Because of this, we set the number of rows and columns to 1,
and put in a blank byte (below). */ 

    all_blank = ((rows == 0) & (cols == 0)) | rs == 0;
    if (all_blank) {
	cols = 1;
	rows = 1;
    }

/* Compute the width of the glyph in pixels, the xoffset,
and the yoffset. */ 

    copy_from_pxl(ds+12);
    width = pxlconv*lcy.ul+0.5;
    xoffset = signed_pxl_word(ds+4); 
    yoffset = signed_pxl_word(ds+6); 
    chw[lnfno][to] = width;

/* Check that we have enough room left in the LN03 font load
buffer. Fudge factor of 3 added because the read below may
read too much. */ 

    def_start = ras_beg+ras_len;
    if (def_start+rows*((cols+7)/32)+24+3 > OBUFLEN) {
	fprintf(stderr,"no more room in LN03 font load buffer (%ld bytes long)\n",
		OBUFLEN);
	return(1);
    }

/* Clear the character definition area in the LN03 font load
buffer. */ 

    for(i=0; i<24+rows*((cols+7)/8); i++)
      	lnf[def_start+i] = 0; 

/* Set the fields in the first six longwords of the LN03
font load character definition. The first assignment sets
the so-called "flag flag", which must be always be set
according to the Common Font File Format. A conversion
factor of 24 is used in converting pixel values, because the
values are supposed to be in centipoints in the LN03 font
load, and if we assume there are 300 pixels in an inch, then
there are 7200 centipoints in an inch. */ 

    lnf[def_start+3] = 0x80; 
    lcy.ul = 24*width;   
    copy_to_lnf(def_start+4);
    lcy.l = -24*xoffset;
    copy_to_lnf(def_start+8);
    lcy.l = -24*yoffset;
    copy_to_lnf(def_start+12);

/* The rasters are always placed in portrait into the LN03
font load, with no use of run-length encoding. Thus, the
orient field in the raster format will be 0, and the Type 1
field is set to 0x81. */ 

    lnf[def_start+17] = 0x81;
    lnf[def_start+20] = rows%256;
    lnf[def_start+21] = rows/256;
    lnf[def_start+22] = cols%256;
    lnf[def_start+23] = cols/256;

/* Now we copy the rasters themselves. As we do so, we have
to reverse the bits within each byte. */ 

    k = (cols+31)/32;
    n = (cols+7)/8;
    lseek(pxlf,rs,0);
    if (!all_blank) {
	for (l=0; l<rows; l++) {
	    read(pxlf,&lnf[def_start+24+n*l],4*k);
	}
	for (m=0; m<n*rows; m++) 
	    lnf[def_start+24+m] = rev_byte[lnf[def_start+24+m]];
    }

/* Set the character locator, increment the LN03 font load
buffer length, and recompute the three sizes. */ 

    lcy.l = def_start;
    if (to <= leftlast)  i = to-leftfirst; else i = to-rightfirst;
    copy_to_lnf(lnf_chardir+4*i);
    ras_len += 24+rows*n;
    ras_len_added += 24+rows*n;
    if (ras_len%2 == 1) {
    	lnf[ras_beg+ras_len] = 0;
    	ras_len++;
    	ras_len_added++;
    }

    i = rows*((cols+7)/8);
    psize += i;
    j = ((rows+7)/8)*cols;
    lsize += j;
    msize += (i > j) ? i : j;

    return(0);
}

/* Write a blank character of specified width (in pixels)
into LN03 font load buffer. Also, set the chw array. [[This
function is a bit excessive. If we couldn't find a
character's rasters, it would suffice just to leave the
character locator blank.]] */ 

int copy_ersatz_char(to,lnfno,width)
unsigned char to;
int lnfno,width;
{

    unsigned long ds,rs,i,j,def_start;
    unsigned int rows,cols,k,l,m,n;

    cols = 1;
    rows = 1;
    chw[lnfno][to] = width;

/* Check that we have enough room left in the LN03 font load
buffer. Return silently if not. */ 

    def_start = ras_beg+ras_len;
    if (def_start+rows*((cols+7)/32)+24 > OBUFLEN) return(1);

/* Clear the character definition area in the LN03 font load
buffer. */ 

    for(i=0; i<24+rows*((cols+7)/8); i++)
      	lnf[def_start+i] = 0; 
    lnf[def_start+3] = 0x80; 
    lcy.ul = 24*width;   
    copy_to_lnf(def_start+4);

/* The rasters are always placed in portrait into the LN03
font load, with [no use of run-length encoding. Thus, the
orient field in the raster format will be 0, and the Type 1
field is set to 0x81. */ 

    lnf[def_start+17] = 0x81;
    lnf[def_start+20] = rows%256;
    lnf[def_start+21] = rows/256;
    lnf[def_start+22] = cols%256;
    lnf[def_start+23] = cols/256;

/* Set the character locator, increment the LN03 font load
buffer length, and recompute the three sizes. */ 

    n = (cols+7)/8;
    lcy.l = def_start;
    if (to <= leftlast)  i = to-leftfirst; else i = to-rightfirst;
    copy_to_lnf(lnf_chardir+4*i);
    ras_len += 24+rows*n;
    ras_len_added += 24+rows*n;
    if (ras_len%2 == 1) {
    	lnf[ras_beg+ras_len] = 0;
    	ras_len++;
    	ras_len_added++;
    }

    i = rows*((cols+7)/8);
    psize += i;
    j = ((rows+7)/8)*cols;
    lsize += j;
    msize += (i > j) ? i : j;

    return(0);
}

/* The opening part of each NFT file is copied into the
array nfta. Nftlen keeps track of how much of the NFT file
we have read. Nftf is the file descriptor used to do the
reading. */ 

GLOBAL unsigned char nfta[480+1024];
GLOBAL long nftlen;

#define copy_from_nft(i) lcy.c[0] = nfta[i]; lcy.c[1] = nfta[i+1]; \
    lcy.c[2] = nfta[i+2]; lcy.c[3] = nfta[i+3]

/* Open_nft_file opens the NFT file and reads the opening
part into the NFT array. */ 

int open_nft_file(txfno) 
int txfno;
{
    int k,l,jnam,jext,target;
    char fullspec[FILESPECLEN];
#ifndef vms
    char *ln3dir;
#endif

    find_filename(font_name[txfno],&jnam,&jext);
    
    fullspec[0] = '\0';
#ifdef vms
    if (jnam == 0) strcpy(fullspec,"TEX$LN03DIR:");
#else
    if (jnam == 0) {
#ifndef Apollo
    	ln3dir = getenv("TEXLN03DIR");
#else
    	ln3dir = "/usr/lib/tex/ln03";
#endif
	strcpy(fullspec,ln3dir);
	strcat(fullspec,"/");
    }
#endif
    strcat(fullspec,font_name[txfno]);
    k = (100.0*conv*txfa[txfno] -> scaled_size)/
	    (unmag_conv*txfa[txfno] -> design_size) + 0.5;
    l = strlen(fullspec);
    if (k == 100) strcat(fullspec,".nft");
    else {
	if (k < 1000) sprintf(&fullspec[l],".%03d\0",k);
	else sprintf(&fullspec[l],".%d\0",k);
    }

    nftlen = 0;
    nftf = open(fullspec,0);
    if (nftf == -1) return(1);
    printf("loading NFT file %s%s, ", font_name[txfno],&fullspec[l]);
    fflush(stdout);

    if (read_nft_with_retry(nfta,480) != 0) {
	close(nftf);
    	nftf = -1;
	return(1);
    } 

/* The NFT file might be random, or it might be a Common
Font File Format file that isn't loadable into an LN03. So,
we make a few checks. 

The second longword must be 'FONT'. */ 

    if (nfta[4] != 'F' || nfta[5] != 'O' || nfta[6] != 'N' 
    	|| nfta[7] != 'T') {
    	printf("error: Bad NFT file, lacks FONT.\n\t\t");
    	close(nftf);
    	nftf = -1;
    	return(1);
    }

/* We also check that there are a full 16 bytes of character
parameters. If there are fewer, we give up: LN03s need all
sixteen, and it's too hard to figure out how to give the
missing ones reasonable values. 

Throughout this program, we define some constants beginning
with fnt__ which define byte offsets into the nft file.
[[The long prefixes of these may cause some trouble if one's
C compiler does not recognize too many significant
characters in identifiers.]] */ 

#define fnt__l_parameters_size 200

    copy_from_nft(fnt__l_parameters_size);
    if (lcy.l != 16) {
    	printf(" error: bad NFT file, not enough character parameters\n\t\t");
    	close(nftf);
    	nftf = -1;
    	return(1);
    }

/* Set the variable that tells us the starting location of
the character directory. */ 

    chardir_offset = 480;

/* Figure out what the first and last character codes in the
NFT file are. */ 

#define fnt__l_first_character 164

    copy_from_nft(fnt__l_first_character);
    nft_first_ch = lcy.l;
    copy_from_nft(fnt__l_first_character+4);
    nft_last_ch = lcy.l;

/* We must have 0 <= nft_first_ch <= nft_last_ch <= 255,
otherwise we give up on the NFT file. */ 

    if  (!((0 <= nft_first_ch) && (nft_first_ch <= nft_last_ch) &&
    	(nft_last_ch <= 255))) {
    	printf(" error: bad NFT file, bad character range.\n\t\t");
    	close(nftf);
    	nftf = -1;
    	return(1);
    }

/* Now read the character directory into the nfta. */

    target = chardir_offset+4*(nft_last_ch+1-nft_first_ch);
    if (read_nft_with_retry(&nfta[480],target) != 0) {
    	close(nftf);
    	nftf = -1;
    	return(1);
    }
    return(0);
}

/* Copy_nft_char copies the character parameters and rasters
corresponding to the from argument out of the NFT file and
into the LN03 font buffer. It also updates the chw
(character width) array. */ 

int copy_nft_char(from,to,lnfno)
unsigned char from,to;
int lnfno;
{

    int rows,columns,quo;
    long i,j,len,def_start,target;

/* Replace from by the first character code if the NFT file
has no rasters for code from. If this is done, the output
will of course be mangled. The user has already been warned
above, so no further message is needed. */ 

    if (from < nft_first_ch) from = nft_first_ch;
    if (from > nft_last_ch) from = nft_last_ch;

/* First we need to determine def_start, the byte offset of
the character definition for code from in the NFT file */ 

    copy_from_nft(chardir_offset+(from-nft_first_ch)*4);
    def_start = lcy.l;

/* If the locator is earlier in the file, just give up. Otherwise, assume
it's good, continue and give a vague error message is something goes wrong.
*/ 

    if (def_start < nftlen || read_nft_until(def_start) != 0) {
    	printf(" -- LN03 font file bad, using blanks\n");
    	return(1);
    }

/* Read the first 24 bytes of character data. */ 

    def_start = ras_beg+ras_len;
    if (read_nft_with_retry(&lnf[def_start],nftlen+24) != 0) return(1);

/* Now we need to check that the rasters are uncompressed.
LN03s can't accept compressed rasters, and this program
isn't clever enough to decompress them. */ 

    if (lnf[def_start+17] != 129) {
	printf(" -- LN03 font file bad, using blanks\n");
	return(1);
    }

/* Fill in the chw array (which holds character widths).
Centipoint to pixel conversion is necessary (there are 24
centipoints in a pixel), with rounding (hence the 12). */ 

    copy_from_lnf(def_start+4);
    chw[lnfno][to] = (lcy.l+12)/24;

/* NFT files may contain character widths which are not
integral numbers of pixels. It is necessary to round such
values to pixels when copying into the final font load -- if
sent unrounded to the LN03, the widths will be truncated and
positions will be off in the printed output. */ 

    lcy.l = 24*chw[lnfno][to];
    copy_to_lnf(def_start+4);

/* Now we need to compute the size of the rasters, and copy
that number of bytes into the LN03 font buffer. */ 

    rows = lnf[def_start+20]+256*lnf[def_start+21];
    columns = lnf[def_start+22]+256*lnf[def_start+23];

/* We have to update psize, lsize and msize to fill slots in
the format. */ 

    quo = rows/8;
    if (rows != quo*8) quo++;
    i = quo*columns;
    lsize += quo*columns;
    quo = columns/8;
    if (columns != quo*8) quo++;
    psize += quo*rows;
    if (i > quo*rows)  msize += i; else msize += quo*rows;

/* Now do the actual copy. We have to ensure that the rasters are
word-aligned in the font load (where one word = 2 bytes, of course). */ 

    if (lnf[def_start+16] % 2 == 0) len = quo*rows; else len = i;
    if (read_nft_with_retry(&lnf[def_start+24],nftlen+len) != 0)
    	return(1);
    lcy.l = def_start;
    if (to <= leftlast)  i = to-leftfirst; else i = to-rightfirst;
    copy_to_lnf(lnf_chardir+4*i);
    ras_len += len+24;
    ras_len_added += len+24;
    if (ras_len % 2 != 0) {
    	lnf[ras_beg+ras_len] = 0;
	ras_len++;
	ras_len_added++;
    }
    return(0);

}

int read_nft_with_retry(where,upto)
long upto;
char *where;
{
    long i,target;
    int l;
    
    i = 0;
    while (nftlen < upto) {
    	target = upto-nftlen;
    	l = read(nftf,&where[i],target);
    	if (l <= 0) {
	    printf(" -- LN03 font file bad, using blanks\n");
	    return(1);
	} 
    	nftlen += l;
    	i += l;
    }
    return(0);
}

int read_nft_until(pos)
long pos;
{
    char bit_bucket[512];
    int l;
    long target;
    
    while (nftlen < pos) {
    	target = pos-nftlen;
    	if (target > 512) target = 512;
    	l = read(nftf,bit_bucket,target);
    	if (l <= 0) {
	    printf(" -- LN03 font file bad, using blanks\n");
	    return(1);
	} 
    	nftlen += l;
    }
    return(0);
}

GLOBAL unsigned char preline[96];    

/* write_lnf performs the last fixups to the LN03 fnnt buffer and dumps it,
sixelized, into the output file. */ 

int write_lnf (){

    long i,j,k,rem,quo,ma;

/* We now have to fix a number of slots: size of file, length of rasters,
final 'FONT', psize, lsize, msize. */

    lcy.l = ras_beg+ras_len+8;
    copy_to_lnf(0); 
    copy_to_lnf(lcy.l-8);
    lnf[lcy.l-4] = 'F';
    lnf[lcy.l-3] = 'O';
    lnf[lcy.l-2] = 'N';
    lnf[lcy.l-1] = 'T';

/* Clear out remaining bytes up to 96 more. */

    j = 96*((lcy.l+95)/96);
    for (i=lcy.l; i<j; i++) lnf[i] = 0;

/* Length of rasters */

#define fnt__l_char_definitions_length 156

    lcy.l = ras_len;
    copy_to_lnf(fnt__l_char_definitions_length);

#define fnt__l_portrait_byte_count 228
#define fnt__l_landscape_byte_count 232
#define fnt__l_mixed_byte_count 236

    lcy.l = psize;
    copy_to_lnf(fnt__l_portrait_byte_count);

    lcy.l = lsize;
    copy_to_lnf(fnt__l_landscape_byte_count);

    lcy.l = msize;
    copy_to_lnf(fnt__l_mixed_byte_count);

/* Now sixelize and write the contents of LNF. */ 

    sixelize_and_write(ras_beg+ras_len+8);
    return(0);
}

int sixelize_and_write(howmuch)
int howmuch;
{
    int quo,i,j;

    quo = howmuch/96;
    if (howmuch > quo*96) quo++;

    for (i=0; i<quo; i++) {
	for (j=0; j<96; j++) 
	    preline[j] = lnf[96*i+j];
	write_preline();
    }

}

int write_preline() {

    char sixel_line[129];
    int i,j,ix,pllen;
    unsigned v,w;

    pllen = 96;
    ix = 0;
    sixel_line[128] = '\0';
    for (i=0; i<128; i++) sixel_line[i] = '?';
    for (i=0; i<pllen; i += 3) {
    	v = preline[i];
    	w = v>>2;
    	sixel_line[ix] = 63+w;
	ix++;
    	w = (v&3)<<4;
    	v = preline[i+1];
    	w |= v>>4;
    	sixel_line[ix] = 63+w;
	ix++;
    	w = (v&15)<<2;
    	v = preline[i+2];
    	w |= v>>6;
    	sixel_line[ix] = 63+w;
    	ix++;
    	w = v&63;
    	sixel_line[ix] = 63+w;
    	ix++;
    }
    fprintf(outfile,"\n%s",sixel_line);
}

/* Initializes the LN03 font buffer. */ 

int initialize_lnf(lnfno) 
int lnfno;
{
    int i,j;

/* The following array holds reasonable values for bytes 0-479 of an LN03
format font. These bytes were copied from a font load which the LN03 was
known to accept. The font loads generated by this program are initialized
using these values. Some of them are overwritten later, however. */ 

    static char good_opening[512] = {
	104,38,0,0,70,79,78,84,
	1,0,0,0,31,0,0,0,
	20,0,0,0,85,48,48,48,
	48,48,48,48,48,50,83,75,
	48,48,71,71,48,48,48,49,
	85,90,90,90,90,48,50,70,
	48,48,48,0,0,0,0,0,
	0,0,0,0,0,0,0,0,
	0,0,0,0,0,0,0,0,
	0,0,0,0,0,0,0,0,
	0,0,0,0,0,0,0,0,
	181,7,9,0,11,0,14,0,
	0,0,0,0,104,0,0,0,
	252,0,0,0,124,0,0,0,
	100,1,0,0,120,1,0,0,
	224,1,0,0,4,0,0,0,
	88,3,0,0,0,0,0,0,
	92,3,0,0,48,0,0,0,
	92,3,0,0,0,0,0,0,
	140,3,0,0,212,34,0,0,
	140,3,0,0,33,0,0,0,
	126,0,0,0,0,0,0,0,
	0,0,0,0,0,0,0,0,
	0,0,0,0,0,0,0,0,
	32,0,0,0,168,0,0,0,
	16,0,0,0,94,0,0,0,
	0,0,0,0,94,0,0,0,
	0,0,0,0,94,0,0,0,
	0,0,0,0,236,25,0,0,
	54,25,0,0,14,27,0,0,
	0,0,0,0,0,0,0,0,
	0,0,0,0,2,0,0,0,
	7,0,0,0,92,3,0,0,
	7,0,0,0,99,3,0,0,
	16,0,0,0,106,3,0,0,
	16,0,0,0,122,3,0,0,
	0,0,0,0,0,0,0,0,
	0,0,0,0,0,0,0,0,
	10,0,0,0,244,1,0,0,
	0,0,24,0,16,0,0,0,
	16,0,0,0,1,0,1,0,
	1,0,1,0,0,0,1,0,
	0,0,0,0,0,0,0,0,
	0,0,0,0,0,0,0,0,
	0,0,0,0,0,0,0,0,
	30,0,0,0,20,0,0,0,
	196,255,255,255,20,0,0,0,
	106,255,255,255,20,0,0,0,
	0,0,1,0,0,0,30,0,
	166,255,255,255,0,0,0,0,
	40,0,0,0,0,0,0,0,
	60,0,0,0,240,0,0,0,
	60,0,0,0,100,0,0,0,
	240,0,0,0,120,0,0,0,
	40,0,0,0,120,0,0,0,
	96,255,255,255,136,255,255,255,
	186,255,255,255,240,0,0,0,
	76,255,255,255,60,0,0,0,
	160,0,0,0,120,0,0,0,
	20,0,0,0,20,0,0,0,
	140,3,0,0,194,3,0,0,
	244,3,0,0,160,4,0,0,
	254,4,0,0,162,5,0,0,
	46,6,0,0,84,6,0,0};
    int pool_beg;

/* The character directory always begins at position 480 in the Common
Font File Format. */

    lnf_chardir = 480; 
    ras_len = 0;
    psize = 0;
    lsize = 0;
    msize = 0;

/* Copy the good values into the lnf array */

    for (i=0; i<480; i++) 
	lnf[i] = good_opening[i];

/* Set the last character if necessary */ 

#define fnt__l_first_character 164

    if (lastch[lnfno] < leftlast && !using_r) 
    	lnf[fnt__l_first_character+4] = lastch[lnfno];
    if (using_r) 
    	lnf[fnt__l_first_character+4] = lastch[lnfno]-rightfirst+
	    leftfirst;

/* Set the character counts */

#define fnt__l_infile_locators 204
#define fnt__l_character_definitions 212
#define fnt__l_raster_count 220

    i = lnf[fnt__l_first_character+4]-
	    lnf[fnt__l_first_character]+1;
    ras_beg = lnf_chardir + 4*i + 4 + 48;
    lnf[fnt__l_infile_locators] = i;
    lnf[fnt__l_character_definitions] = i;
    lnf[fnt__l_raster_count] = i;
    lnf[ras_beg-52] = lnf[ras_beg-51] = lnf[ras_beg-50] =
    	lnf[ras_beg-49] = 0;

/* Set the font file id. This id is a 31-byte string. We make it depend on
the lnfno number, and on whether this is a left or right font.
Specifically, the first seven bytes are U0000nn where nn is lnfno possibly
with a leading zero. The character set part of the ID is 1O if using_r,
otherwise the default from good_opening. */ 

#define fnt__t_font_file_id 20

    lnf[fnt__t_font_file_id+5] = lnfno/10+'0';
    lnf[fnt__t_font_file_id+6] = lnfno % 10 + '0';
    if (using_r) lnf[fnt__t_font_file_id+20] = 'O';

/* We now have to set some fields in the font format that are pointers to
where other fields begin. These pointers depend on the number of glyphs we
are placing in the font file. */ 

#define fnt__a_subset_tables 128

    lcy.l = lnf_chardir+4*i;
    copy_to_lnf(fnt__a_subset_tables);

    lcy.l = lcy.l+4;
    copy_to_lnf(fnt__a_subset_tables+8);
    copy_to_lnf(fnt__a_subset_tables+16);

    lcy.l = lcy.l+48;
    copy_to_lnf(fnt__a_subset_tables+24);

#define fnt__a_char_definitions 160 

    copy_to_lnf(fnt__a_char_definitions);

/* Set up the string pool region of the font load (48 bytes). The only
tricky part here is the character set designator at the very beginning of
the pool. Left fonts use one designator, right fonts another. [[More
explanation is needed.]] */ 

    pool_beg = ras_beg-48;
	
    lnf[pool_beg] = '0';
    lnf[pool_beg+1] = using_r ? '<':'B';
    lnf[pool_beg+2] = '\011';	    /* ascii tab */
    lnf[pool_beg+3] = 'Z';	    
    lnf[pool_beg+4] = 'Z';	    
    lnf[pool_beg+5] = 'Z';	    
    lnf[pool_beg+6] = 'Z';

/* For reasons that are beyond my comprehension, the Common Font File
Format requires us to copy the first seven characters of the font file id
into one piece of the string pool, and the first sixteen into another
place. */ 

    for (i=1; i<8; i++) 
	lnf[pool_beg+7+i-1] = lnf[fnt__t_font_file_id+i-1];
    for (i=1; i<17; i++)
	lnf[pool_beg+7+7+i-1] = ' ';
    for (i=1; i<17; i++)
	lnf[pool_beg+7+7+16+i-1] = lnf[fnt__t_font_file_id+i-1];
    lnf[pool_beg+46] = lnf[pool_beg+47] = 0;

/* Now make string descriptors point into the string pool. */

#define fnt__a_char_set 260
#define fnt__a_family_id 268
#define fnt__a_family_name 276
#define fnt__a_font_id 284

    lcy.l = pool_beg;
    copy_to_lnf(fnt__a_char_set);
    lcy.l = pool_beg+7;
    copy_to_lnf(fnt__a_family_id);
    lcy.l = pool_beg+7+7;
    copy_to_lnf(fnt__a_family_name);
    lcy.l = pool_beg+7+7+16;
    copy_to_lnf(fnt__a_font_id);

/* Mercifully, all remaining font file slots that we can fill now are
already good as received from good_opening. */ 

}

\f


/* There are only two global entry points to this code. here they are: */

extern int open_pk_file();
extern int copy_pk_char();

/* We use the following global variables (that were previously defined). */

EXTERN PKFont *pkfont;				/* in open_pk_file */
static float pkconv;				/* conversion factor */

/* This routine opens the PK file.  It really is just a jacket for the
routine PKLoadFont We also calculate the conversion factor (pkconv).  

Much of this routine is taken or adapted from open_pxl_file.  */


int open_pk_file(txfno)
int txfno;
{
    float two_to_the_20th = 0x100000;
    int magnification;

    magnification = 1000.0 * ( (float) txfa[txfno]->scaled_size / 
		(float) txfa[txfno]->design_size ) + 0.5;

    pkfont = PKLoadFont( font_name[txfno], magnification, 300 );
    if  (pkfont == NULL)  {
	if  (errno != ENOENT && errno != ENXIO)
	    fprintf( stderr, "%s\n\t\t", PKerror );
	return(-1);
    }
    printf("loading PK file %s, ", PKerror);  fflush(stdout);

    pkconv = ( (float) pkfont->design_size * (float) pkfont->magnification ) /
		( 5.0 * 72.27 * two_to_the_20th * two_to_the_20th );
#ifdef PKDEBUG
    printf( "pkconv=%g, ", pkconv ); fflush(stdout);
#endif
    return(0);
}

\f


/* This routine obtains a glyph from a PK font then copies it to the LN03
buffer.  If the glyph isn't in the font, then we call copy_ersatz_char 
to insert a blank character.  This routine has greatly adapted and/or 
stolen code from copy_pxl_char.  */

copy_pk_char(fontptr,from,txfno,to,lnfno)
PKFont *fontptr;
unsigned char from,to;
int txfno,lnfno;
{
    PKGlyph *glyphptr;
    int i,j, bytes_per_row, def_start = ras_beg + ras_len;
    int tfm_width, width;

    glyphptr = PKGetGlyph( fontptr, (int) from ); /* get the glyph */

    if  (glyphptr == NULL) {		    /* not there? */
	width = font_width[txfno][from]*conv + 0.5; /* insert a */
	return copy_ersatz_char(to,lnfno,width);    /*    blank */
    } else if  (strlen(PKerror) != 0) {	    /* error? */
	printf("%s\n\t\t",PKerror);	    /* print it out */
    }

    if (glyphptr->height == 0 || glyphptr->width == 0) {    /* kludge for LN03 */
	width = font_width[txfno][from]*conv + 0.5;	    /* insert a blank */
	return copy_ersatz_char(to,lnfno,width);
    }

/*  Copy the rasters to the LN03 buffer.  First zero the LN03 glyph header
and the copy the rasters.  */

    bytes_per_row = (glyphptr->width + 7) / 8;

    for (i = 0; i < 24; i++ )
	    lnf[def_start+i] = 0;

    for (i = 0; i < glyphptr->height*bytes_per_row; i++ )
	    lnf[def_start+i+24] = glyphptr->rasters[i];

/*  Fill in the header for the LN03 glyph */

    tfm_width = glyphptr->tfm_width*pkconv + 0.5;
    chw[lnfno][to] = glyphptr->h_escapement / 65536;
#ifdef  PKDEBUG
    if  (tfm_width != chw[lnfno][to]) {
#ifdef vms
	globalvalue  SS$_DEBUG;
	LIB$SIGNAL(SS$_DEBUG);
#else
	abort();
#endif
    }
#endif


    lnf[def_start+3] = 0x80;
    lcy.ul =  24*chw[lnfno][to];	copy_to_lnf(def_start+4);
    lcy.l  = -24*glyphptr->h_offset;	copy_to_lnf(def_start+8);
    lcy.l  = -24*glyphptr->v_offset;	copy_to_lnf(def_start+12);

    lnf[def_start+17] = 0x81;
    lnf[def_start+20] = glyphptr->height%256;
    lnf[def_start+21] = glyphptr->height*256;
    lnf[def_start+22] = glyphptr->width%256;
    lnf[def_start+23] = glyphptr->width*256;

/*  The following is copy directly from copy_pxl_char.  I have no idea what
it is really for... */

    {	int i, j; 
	lcy.l = def_start;
	if (to <= leftlast)  i = to-leftfirst; else i = to-rightfirst;
	copy_to_lnf(lnf_chardir+4*i);
	ras_len += 24 + glyphptr->height*bytes_per_row;
	ras_len_added += 24 + glyphptr->height*bytes_per_row;
	if (ras_len%2 == 1) {
	    lnf[ras_beg+ras_len] = 0;
	    ras_len++;
	    ras_len_added++;
	}

	i = glyphptr->height*((glyphptr->width+7)/8);
	psize += i;
	j = ((glyphptr->height+7)/8)*glyphptr->width;
	lsize += j;
	msize += (i > j) ? i : j;
    }
    return(0);
}
DataMuseum.dk

DKUUG/EUUG Conference tapes

⟦a7d4972ca⟧ TextFile

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