path: root/Build/source/texk/dvipdfm-x/pkfont.c

/* This is dvipdfmx, an eXtended version of dvipdfm by Mark A. Wicks.

    Copyright (C) 2002-2021 by Jin-Hwan Cho and Shunsaku Hirata,
    the dvipdfmx project team.
    
    Copyright (C) 1998, 1999 by Mark A. Wicks <mwicks@kettering.edu>

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.
    
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
    
    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include "system.h"
#include "mem.h"
#include "error.h"

#include "dpxfile.h"

#include "numbers.h"
#include "pdfobj.h"
#include "pdfdev.h" /* pdf_rect */

#include "pdfencoding.h"
#include "pdffont.h"

#include "pkfont.h"

#define ENABLE_GLYPHENC  1

#ifndef PKFONT_DPI_DEFAULT
#define PKFONT_DPI_DEFAULT 600u
#endif

static unsigned base_dpi = PKFONT_DPI_DEFAULT;

void
PKFont_set_dpi (int dpi)
{
  if (dpi <= 0)
    ERROR("Invalid DPI: %d\n", dpi);
  base_dpi = dpi;
}


/* (Only) This requires TFM to get design size... */
#include "tfm.h"

static unsigned
truedpi (const char *ident, double point_size, unsigned bdpi)
{
  unsigned  dpi = bdpi;
  double    design_size;
  int       tfm_id;

  tfm_id = tfm_open(ident, 0);
  if (tfm_id < 0)
    return  dpi;

  design_size = tfm_get_design_size(tfm_id);
  if (design_size <= 0.0)
    WARN("DESGIN_SIZE <= 0.0? (TFM=\"%s\")", ident);
  else {
    dpi  = (unsigned) ROUND(base_dpi * point_size / design_size, 1.0);
  }

  return  dpi;
}

static FILE *
dpx_open_pk_font_at (const char *ident, unsigned dpi)
{
  FILE  *fp;
  char  *fqpn;
  kpse_glyph_file_type kpse_file_info;

/* 
   If pdftex.map is used, there are cases for example ident is like
   cmr10.pfb. Because of the suffix .pfb here, mktexpk does not
   work right. So we remove the suffix .pfb, if it exists.
*/
  fqpn = strrchr(ident, '.');
  if (fqpn && strcasecmp(fqpn, ".pfb") == 0) {
    *fqpn = '\0';
  }
  fqpn = kpse_find_glyph(ident, dpi, kpse_pk_format, &kpse_file_info);
  if (!fqpn)
    return  NULL;
  fp   = MFOPEN(fqpn, FOPEN_RBIN_MODE);
  RELEASE(fqpn);

  return  fp;
}


int
pdf_font_open_pkfont (pdf_font *font, const char *ident, int index, int encoding_id, int embedding, double point_size)
{
  unsigned  dpi;
  FILE     *fp;

  if (!ident || point_size <= 0.0)
    return  -1;
  if (!embedding) {
    WARN("Ignoring no-embed option for PK font: %s", ident);
  }
  if (index != 0) {
    WARN("Ignoring font index option for PK font: %s", ident);
  }

  dpi = truedpi(ident, point_size, base_dpi);
  fp  = dpx_open_pk_font_at(ident, dpi);
  if (!fp)
    return  -1;
  MFCLOSE(fp);

  /* Type 3 fonts doesn't have FontName.
   * FontFamily is recommended for PDF 1.5.
   */
  font->fontname = NEW(strlen(ident)+1, char);
  strcpy(font->fontname, ident);

  if (encoding_id >= 0) {
    pdf_encoding_used_by_type3(encoding_id);
    WARN("PK font is found for font \"%s\" but non built-in encoding \"%s\" is specified.",
         ident, pdf_encoding_get_name(encoding_id));
#if  ENABLE_GLYPHENC
    WARN(">> Assuming this is for glyph name assignment.");
#else
    WARN(">> I can't reencode PK font. (not enough information available)");
    WARN(">> Maybe you need to install pfb/opentype/truetype font.");
#endif
  }

  return  0;
}


/* We are using Mask Image. Fill black is bit clear.
 * Optimizing those codes doesn't improve things.
 */
static uint32_t
fill_black_run (unsigned char *dp, uint32_t left, uint32_t run_count)
{
  const static unsigned char mask[8] = {
    127u, 191u, 223u, 239u, 247u, 251u, 253u, 254u
  };
  uint32_t  right = left + run_count - 1;
  for ( ; left <= right; left++) {
    dp[left / 8] &= mask[left % 8];
  }
  return  run_count;
}

/* Just skip bits. See decode_packed() */
static uint32_t
fill_white_run (uint32_t run_count)
{
  return  run_count;
}

static uint32_t
pk_packed_num (uint32_t *np, int dyn_f, unsigned char *dp, uint32_t pl)
{
  uint32_t nmbr = 0, i = *np;
  int      nyb, j;
#define get_nyb() ((i % 2) ? dp[i/2] & 0x0f : (dp[i/2] >> 4) & 0x0f)

  if (i / 2 == pl) {
    WARN("EOD reached while unpacking pk_packed_num.");
    return  0;
  }
  nyb = get_nyb(); i++;
  if (nyb == 0) {
    j = 0;
    do {
      if (i / 2 == pl) {
        WARN("EOD reached while unpacking pk_packed_num.");
        break;
      }
      nyb = get_nyb(); i++;
      j++;
    } while (nyb == 0);
    nmbr = nyb;
    while (j-- > 0) {
      if (i / 2 == pl) {
        WARN("EOD reached while unpacking pk_packed_num.");
        break;
      }
      nyb  = get_nyb(); i++;
      nmbr = nmbr * 16 + nyb;
    }
    nmbr += (13 - dyn_f) * 16 + dyn_f - 15;
  } else if (nyb <= dyn_f) {
    nmbr = nyb;
  } else if (nyb < 14) {
    if (i / 2 == pl) {
      WARN("EOD reached while unpacking pk_packed_num.");
      return  0;
    }
    nmbr = (nyb - dyn_f - 1) * 16 + get_nyb() + dyn_f + 1;
    i++;
  }

  *np = i;
  return  nmbr;
}


static void
send_out (unsigned char *rowptr, uint32_t rowbytes, pdf_obj *stream)
{
  pdf_add_stream(stream, (void *)rowptr, rowbytes);
}

static int
pk_decode_packed (pdf_obj *stream, uint32_t wd, uint32_t ht,
                  int dyn_f, int run_color, unsigned char *dp, uint32_t pl)
{
  unsigned char  *rowptr;
  uint32_t        rowbytes;
  uint32_t        i, np = 0;
  uint32_t        run_count = 0, repeat_count = 0;

  rowbytes = (wd + 7) / 8;
  rowptr   = NEW(rowbytes, unsigned char);
  /* repeat count is applied to the *current* row.
   * "run" can span across rows.
   * If there are non-zero repeat count and if run
   * spans across row, first repeat and then continue.
   */
  for (np = 0, i = 0; i < ht; i++) {
    uint32_t rowbits_left, nbits;

    repeat_count = 0;
    memset(rowptr, 0xff, rowbytes); /* 1 is white */
    rowbits_left = wd;
    /* Fill run left over from previous row */
    if (run_count > 0) {
      nbits = MIN(rowbits_left, run_count);
      switch (run_color) {
      case  0:
        rowbits_left -= fill_black_run(rowptr, 0, nbits);
        break;
      case  1:
        rowbits_left -= fill_white_run(nbits);
        break;
      }
      run_count -= nbits;
    }

    /* Read nybbles until we have a full row */
    while (np / 2 < pl && rowbits_left > 0) {
      int  nyb;

      nyb = (np % 2) ? dp[np/2] & 0x0f : (dp[np/2] >> 4) & 0x0f;
      if (nyb == 14) { /* packed number "repeat_count" follows */
        if (repeat_count != 0)
          WARN("Second repeat count for this row!");
        np++; /* Consume this nybble */
        repeat_count = pk_packed_num(&np, dyn_f, dp, pl);
      } else if (nyb == 15) {
        if (repeat_count != 0)
          WARN("Second repeat count for this row!");
        np++; /* Consume this nybble */
        repeat_count = 1;
      } else { /* run_count */
        /* Interprete current nybble as packed number */
        run_count = pk_packed_num(&np, dyn_f, dp, pl);
        nbits = MIN(rowbits_left, run_count);
        run_color  = !run_color;
        run_count -= nbits;
        switch (run_color) {
        case  0:
          rowbits_left -= fill_black_run(rowptr, wd - rowbits_left, nbits);
          break;
        case  1:
          rowbits_left -= fill_white_run(nbits);
          break;
        }
      }
    }
    /* We got bitmap row data. */
    send_out(rowptr, rowbytes, stream);
    for ( ; i < ht && repeat_count > 0; repeat_count--, i++)
      send_out(rowptr, rowbytes, stream);
    }
  RELEASE(rowptr);

  return  0;
}

static int
pk_decode_bitmap (pdf_obj *stream, uint32_t wd, uint32_t ht,
                  int dyn_f, int run_color, unsigned char *dp, uint32_t pl)
{
  unsigned char  *rowptr, c;
  uint32_t        i, j, rowbytes;
  const static unsigned char mask[8] = {
    0x80u, 0x40u, 0x20u, 0x10u, 0x08u, 0x04u, 0x02u, 0x01u
  };

  ASSERT( dyn_f == 14 );
  if (run_color != 0) {
    WARN("run_color != 0 for bitmap pk data?");
  } else if (pl < (wd * ht + 7) / 8) {
    WARN("Insufficient bitmap pk data. %ldbytes expected but only %ldbytes read.",
         (wd * ht + 7) / 8, pl);
    return  -1;
  }

  rowbytes = (wd + 7) / 8;
  rowptr   = NEW(rowbytes, unsigned char);
  memset(rowptr, 0, rowbytes);
  /* Flip. PK bitmap is not byte aligned for each rows. */
  for (i = 0, j = 0; i < ht * wd; i++) {
    c = dp[i / 8] & mask[i % 8];
    if (c == 0)
      rowptr[j / 8] |= mask[i % 8]; /* flip bit */
    j++;
    if (j == wd) {
      send_out(rowptr, rowbytes, stream);
      memset(rowptr, 0, rowbytes);
      j = 0;
    }
  }

  return  0;
}


static void
do_preamble (FILE *fp)
{
  /* Check for id byte */
  if (fgetc(fp) == 89) {
    /* Skip comment */
    skip_bytes(get_unsigned_byte(fp), fp);
    /* Skip other header info.  It's normally used for verifying this
       is the file wethink it is */
    skip_bytes(16, fp);
  } else {
    ERROR("embed_pk_font: PK ID byte is incorrect.  Are you sure this is a PK file?");
  }
  return;
}

struct pk_header_
{
  uint32_t pkt_len;
  int32_t  chrcode;
  int32_t  wd, dx, dy;
  uint32_t bm_wd, bm_ht;
  int32_t  bm_hoff, bm_voff;
  int      dyn_f, run_color;
};

static int
read_pk_char_header (struct pk_header_ *h, unsigned char opcode, FILE *fp)
{
  ASSERT(h);

  if ((opcode & 4) == 0) { /* short */
    h->pkt_len = (opcode & 3) << 8 | get_unsigned_byte(fp);
    h->chrcode = get_unsigned_byte(fp);
    h->wd = get_unsigned_triple(fp);     /* TFM width */
    h->dx = get_unsigned_byte(fp) << 16; /* horizontal escapement */
    h->dy = 0;
    h->bm_wd    = get_unsigned_byte(fp);
    h->bm_ht    = get_unsigned_byte(fp);
    h->bm_hoff  = get_signed_byte(fp);
    h->bm_voff  = get_signed_byte(fp);
    h->pkt_len -= 8;
  } else if ((opcode & 7) == 7) { /* long */
    h->pkt_len = get_positive_quad(fp, "PK", "pkt_len");
    h->chrcode = get_signed_quad(fp);
    h->wd = get_signed_quad(fp);
    h->dx = get_signed_quad(fp); /* 16.16 fixed point number in pixels */
    h->dy = get_signed_quad(fp);
    h->bm_wd    = get_positive_quad(fp, "PK", "bm_wd");
    h->bm_ht    = get_positive_quad(fp, "PK", "bm_ht");
    h->bm_hoff  = get_signed_quad(fp);
    h->bm_voff  = get_signed_quad(fp);
    h->pkt_len -= 28;
  } else { /* extended short */
    h->pkt_len = (opcode & 3) << 16 | get_unsigned_pair(fp);
    h->chrcode = get_unsigned_byte(fp);
    h->wd = get_unsigned_triple(fp);
    h->dx = get_unsigned_pair(fp) << 16;
    h->dy = 0;
    h->bm_wd    = get_unsigned_pair(fp);
    h->bm_ht    = get_unsigned_pair(fp);
    h->bm_hoff  = get_signed_pair(fp);
    h->bm_voff  = get_signed_pair(fp);
    h->pkt_len -= 13;
  }

  h->dyn_f     = opcode / 16;
  h->run_color = (opcode & 8) ? 1 : 0;

  if ((uint32_t)h->chrcode > 0xff)
  {
    WARN("Unable to handle long characters in PK files: code=0x%04x", h->chrcode);
    return  -1;
  }

  return  0;
}

/* CCITT Group 4 filter may reduce file size. */
static pdf_obj *
create_pk_CharProc_stream (struct pk_header_ *pkh,
                           double             chrwid,
                           unsigned char     *pkt_ptr, uint32_t pkt_len)
{
  pdf_obj  *stream; /* charproc */
  int32_t   llx, lly, urx, ury;
  int       len;

  llx = -pkh->bm_hoff;
  lly =  pkh->bm_voff - pkh->bm_ht;
  urx =  pkh->bm_wd - pkh->bm_hoff;
  ury =  pkh->bm_voff;

  stream = pdf_new_stream(STREAM_COMPRESS);
  /*
   * The following line is a "metric" for the PDF reader:
   *
   * PDF Reference Reference, 4th ed., p.385.
   *
   * The wx (first operand of d1) must be consistent with the corresponding
   * width in the font's Widths array. The format string of sprint() must be
   * consistent with write_number() in pdfobj.c.
   */
  len = pdf_sprint_number(work_buffer, chrwid);
  len += sprintf (work_buffer + len, " 0 %d %d %d %d d1\n", llx, lly, urx, ury);
  pdf_add_stream(stream, work_buffer, len);
  /*
   * Acrobat dislike transformation [0 0 0 0 dx dy].
   * PDF Reference, 4th ed., p.147, says,
   *
   *   Use of a noninvertible matrix when painting graphics objects can result in
   *   unpredictable behavior.
   *
   * but it does not forbid use of such transformation.
   */
  if (pkh->bm_wd != 0 && pkh->bm_ht != 0 && pkt_len > 0) {
    /* Scale and translate origin to lower left corner for raster data */
    len = sprintf (work_buffer, "q\n%u 0 0 %u %d %d cm\n", pkh->bm_wd, pkh->bm_ht, llx, lly);
    pdf_add_stream(stream, work_buffer, len);
    len = sprintf (work_buffer, "BI\n/W %u\n/H %u\n/IM true\n/BPC 1\nID ", pkh->bm_wd, pkh->bm_ht);
    pdf_add_stream(stream, work_buffer, len);
    /* Add bitmap data */
    if (pkh->dyn_f == 14) /* bitmap */
              pk_decode_bitmap(stream,
                               pkh->bm_wd, pkh->bm_ht,
                               pkh->dyn_f, pkh->run_color,
                               pkt_ptr,    pkt_len);
    else
              pk_decode_packed(stream,
                               pkh->bm_wd, pkh->bm_ht,
                               pkh->dyn_f, pkh->run_color,
                               pkt_ptr,    pkt_len);
    len = sprintf (work_buffer, "\nEI\nQ");
    pdf_add_stream(stream, work_buffer, len);
  } /* Otherwise we embed an empty stream :-( */

  return  stream;
}

#define PK_XXX1  240
#define PK_XXX2  241
#define PK_XXX3  242
#define PK_XXX4  243
#define PK_YYY   244
#define PK_POST  245
#define PK_NO_OP 246
#define PK_PRE   247

#define pk_char2name(b,c) sprintf((b), "x%02X", (unsigned char)(c))
int
pdf_font_load_pkfont (pdf_font *font)
{
  pdf_obj  *fontdict;
  char     *usedchars;
  char     *ident;
  unsigned  dpi;
  FILE     *fp;
  double    point_size, pix2charu;
  int       opcode, code, firstchar, lastchar, prev;
  pdf_obj  *charprocs, *procset, *encoding, *tmp_array;
  double    widths[256];
  pdf_rect  bbox;
  char      charavail[256];
#if  ENABLE_GLYPHENC
  int       encoding_id;
  char    **enc_vec;
#endif /* ENABLE_GLYPHENC */
  int       error = 0;

  if (!font->reference)
    return 0;

  ident       = font->filename;
  point_size  = font->point_size;
  usedchars   = font->usedchars;
#if  ENABLE_GLYPHENC
  encoding_id = font->encoding_id;
  if (encoding_id < 0)
    enc_vec = NULL;
  else {
    enc_vec = pdf_encoding_get_encoding(encoding_id);
  }
#endif /* ENABLE_GLYPHENC */

  ASSERT(ident && usedchars && point_size > 0.0);

  dpi  = truedpi(ident, point_size, base_dpi);
  fp   = dpx_open_pk_font_at(ident, dpi);
  if (!fp) {
    ERROR("Could not find/open PK font file: %s (at %udpi)", ident, dpi);
  }

  memset(charavail, 0, 256);
  charprocs  = pdf_new_dict();
  /* Include bitmap as 72dpi image:
   * There seems to be problems in "scaled" bitmap glyph
   * rendering in several viewers.
   */
  pix2charu  = 72. * 1000. / ((double) base_dpi) / point_size;
  bbox.llx = bbox.lly =  HUGE_VAL;
  bbox.urx = bbox.ury = -HUGE_VAL;
  while ((opcode = fgetc(fp)) >= 0 && opcode != PK_POST) {
    if (opcode < 240) {
      struct pk_header_  pkh;

      error = read_pk_char_header(&pkh, opcode, fp);
      if (error)
        ERROR("Error in reading PK character header.");
      else if (charavail[pkh.chrcode & 0xff])
        WARN("More than two bitmap image for single glyph?: font=\"%s\" code=0x%02x",
             ident, pkh.chrcode);

      if (!usedchars[pkh.chrcode & 0xff])
        skip_bytes(pkh.pkt_len, fp);
      else {
        char          *charname;
        pdf_obj       *charproc;
        unsigned char *pkt_ptr;
        size_t         bytesread;
        double         charwidth;

        /* Charwidth in PDF units */
        charwidth = ROUND(1000.0 * pkh.wd / (((double) (1<<20))*pix2charu), 0.1);
        widths[pkh.chrcode & 0xff] = charwidth;

        /* Update font BBox info */
        bbox.llx = MIN(bbox.llx, -pkh.bm_hoff);
        bbox.lly = MIN(bbox.lly,  (double)pkh.bm_voff - (double)pkh.bm_ht);
        bbox.urx = MAX(bbox.urx,  (double)pkh.bm_wd - (double)pkh.bm_hoff);
        bbox.ury = MAX(bbox.ury,  pkh.bm_voff);

        pkt_ptr = NEW(pkh.pkt_len, unsigned char);
        if ((bytesread = fread(pkt_ptr, 1, pkh.pkt_len, fp))!= pkh.pkt_len) {
          ERROR("Only %ld bytes PK packet read. (expected %ld bytes)",
                bytesread, pkh.pkt_len);
        }
        charproc = create_pk_CharProc_stream(&pkh, charwidth, pkt_ptr, bytesread);
        RELEASE(pkt_ptr);
        if (!charproc)
          ERROR("Unpacking PK character data failed.");
#if  ENABLE_GLYPHENC
        if (encoding_id >= 0 && enc_vec) {
          charname = (char *) enc_vec[pkh.chrcode & 0xff];
          if (!charname) {
            WARN("\".notdef\" glyph used in font (code=0x%02x): %s", pkh.chrcode, ident);
            charname = work_buffer;
            pk_char2name(charname, pkh.chrcode);
          }
        }
        else
#endif /* ENABLE_GLYPHENC */
        {
          charname = work_buffer;
          pk_char2name(charname, pkh.chrcode);
        }

        pdf_add_dict(charprocs, pdf_new_name(charname), pdf_ref_obj(charproc)); /* _FIXME_ */
        pdf_release_obj(charproc);
      }
      charavail[pkh.chrcode & 0xff] = 1;
    } else { /* A command byte */
      switch (opcode) {
      case PK_NO_OP: break;
      case PK_XXX1: case PK_XXX2: case PK_XXX3: case PK_XXX4:
      {
        int32_t len = get_unsigned_num(fp, opcode-PK_XXX1);
        if (len < 0)
          WARN("PK: Special with %d bytes???", len);
        else
          skip_bytes(len, fp);
        break;
      }
      case PK_YYY:  skip_bytes(4, fp);  break;
      case PK_PRE:  do_preamble(fp); break;
      }
    }
  }
  MFCLOSE(fp);

  /* Check if we really got all glyphs needed. */
  for (code = 0; code < 256; code++) {
    if (usedchars[code] && !charavail[code])
      WARN("Missing glyph code=0x%02x in PK font \"%s\".", code, ident);
  }

  /* Now actually fill fontdict. */
  fontdict = pdf_font_get_resource(font);

  pdf_add_dict(fontdict,
               pdf_new_name("CharProcs"), pdf_ref_obj(charprocs));
  pdf_release_obj(charprocs);

  /*
   * Resources:
   *
   *  PDF Reference 4th ed. describes it as "Optional but strongly recommended".
   *  There are no reason to put it in our case, but we will put this.
   *  We do not care about compatibility with Acrobat 2.x. (See implementation
   *  note 47, Appendix H of PDF Ref., 4th ed.).
   */
  procset   = pdf_new_dict();
  tmp_array = pdf_new_array();
  pdf_add_array(tmp_array, pdf_new_name("PDF"));
  pdf_add_array(tmp_array, pdf_new_name("ImageB"));
  pdf_add_dict(procset,
               pdf_new_name("ProcSet"), tmp_array);
  pdf_add_dict(fontdict,
               pdf_new_name("Resources"), procset);

  /* Encoding */
  tmp_array = pdf_new_array();
  prev = -2; firstchar = 255; lastchar = 0;
  for (code = 0; code < 256; code++) {
    char  *charname;
    if (usedchars[code]) {
      if (code < firstchar) firstchar = code;
      if (code > lastchar)  lastchar  = code;
      if (code != prev + 1)
        pdf_add_array(tmp_array, pdf_new_number(code));

#if  ENABLE_GLYPHENC
      if (encoding_id >= 0 && enc_vec) {
        charname = (char *) enc_vec[(unsigned char) code];
        if (!charname) {
          charname = work_buffer;
          pk_char2name(charname, code);
        }
      }
      else
#endif /* ENABLE_GLYPHENC */
      {
        charname = work_buffer;
        pk_char2name(charname, code);
      }
      pdf_add_array(tmp_array, pdf_new_name(charname));
      prev = code;
    }
  }
  if (firstchar > lastchar) {
    ERROR("Unexpected error: firstchar > lastchar (%d %d)",
          firstchar, lastchar);
    pdf_release_obj(tmp_array);
    return  -1;
  }
#if  ENABLE_GLYPHENC
  if (encoding_id < 0 || !enc_vec) {
#else
  if (1) {
#endif /* ENABLE_GLYPHENC */
    encoding  = pdf_new_dict();
    pdf_add_dict(encoding,
		 pdf_new_name("Type"), pdf_new_name("Encoding"));
    pdf_add_dict(encoding,
		 pdf_new_name("Differences"), tmp_array);
    pdf_add_dict(fontdict,
		 pdf_new_name("Encoding"),    pdf_ref_obj(encoding));
    pdf_release_obj(encoding);
  } else
    pdf_release_obj(tmp_array);

  /* FontBBox: Accurate value is important.
   */
  tmp_array = pdf_new_array();
  pdf_add_array(tmp_array, pdf_new_number(bbox.llx));
  pdf_add_array(tmp_array, pdf_new_number(bbox.lly));
  pdf_add_array(tmp_array, pdf_new_number(bbox.urx));
  pdf_add_array(tmp_array, pdf_new_number(bbox.ury));
  pdf_add_dict (fontdict , pdf_new_name("FontBBox"), tmp_array);

  /* Widths:
   *  Indirect reference preffered. (See PDF Reference)
   */
  tmp_array = pdf_new_array();
  for (code = firstchar; code <= lastchar; code++) {
    if (usedchars[code])
      pdf_add_array(tmp_array, pdf_new_number(widths[code]));
    else {
      pdf_add_array(tmp_array, pdf_new_number(0));
    }
  }
  pdf_add_dict(fontdict,
               pdf_new_name("Widths"), pdf_ref_obj(tmp_array));
  pdf_release_obj(tmp_array);

  /* FontMatrix */
  tmp_array = pdf_new_array();
  pdf_add_array(tmp_array, pdf_new_number(0.001 * pix2charu));
  pdf_add_array(tmp_array, pdf_new_number(0.0));
  pdf_add_array(tmp_array, pdf_new_number(0.0));
  pdf_add_array(tmp_array, pdf_new_number(0.001 * pix2charu));
  pdf_add_array(tmp_array, pdf_new_number(0.0));
  pdf_add_array(tmp_array, pdf_new_number(0.0));
  pdf_add_dict (fontdict , pdf_new_name("FontMatrix"), tmp_array);


  pdf_add_dict(fontdict,
               pdf_new_name("FirstChar"), pdf_new_number(firstchar));
  pdf_add_dict(fontdict,
               pdf_new_name("LastChar"),  pdf_new_number(lastchar));

  return  0;
}