File: mp2pf

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fonts-ocr-b 0.2~dfsg1-5
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#!/usr/bin/perl

#
# METAPOST to Type 1 converter
#
# THIS FILE IS PUBLIC DOMAIN NOTWITHSTANDING THE COPYRIGHT ON THE
# OVERALL TSUKURIMASHOU PACKAGE
#
# This file is based on the file "mp2pf.awk" from the METATYPE1 package,
# version 0.55.  It is a manual translation by Matthew Skala from the
# original Awk into Perl, with a lot of features irrelevant to the
# Tsukurimashou project (namely hinting, kerning, ligatures, and AFM
# files) removed to improve maintainability.
#
# The mp2pf.awk file contains no copyright-related notices of its own, but
# the README for METATYPE1 version 0.55 contains the following notices (in
# English and Polish; the slashes are verbatim from the original and
# presumably are some convention for expressing non-ASCII Polish letters in
# the ASCII file):
#
#     This is METATYPE1 package -- a tool for creating Type 1 fonts using
#     METAPOST. The package belongs to public domain (no copyrights,
#     copylefts, copyups, copydowns, etc.).
#     Version: 0.55 (16.09.2009; a tentative version, released along with
#              the sources of the Latin Modern fonts ver. 2.003)
#     Author: JNS team <JNSteam@gust.org.pl>
#
#     To jest pakiet METATYPE1 -- narz/edzie do tworzenia font/ow Type 1
#     za pomoc/a systemu METAPOST. Pakiet stanowi dobro wsp/olne
#     (/zadnych copyright/ow, copyleft/ow, copyup/ow, copydown/ow, etc.).
#     Wersja: 0.55 (16.09.2009 -- wersja opublikowana wraz z wersj/a
#             /xr/od/low/a 2.003 pakietu font/ow Latin Modern)
#     Autorstwo: JNS team <JNSteam@gust.org.pl>
#
# Although I assert my general right to claim copyright on work of my own
# that draws from public domain source materials, I nonetheless am releasing
# this file to the public domain in an effort to maintain the spirit of the
# JNS team's release above.
#
# The Adobe copyright notice in the Postscript template code below
# refers only to certain boilerplate required by the file format; it
# applies to no other part of this file and falls under the "scènes
# à faire" doctrine in jurisdictions where that is relevant.
#
# 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.
#
# Matthew Skala
# mskala@ansuz.sooke.bc.ca
#

########################################################################

# header from the Awk version (much of this is now irrelevant due to
# deleted code):

# THIS FILE BELONGS TO THE METATYPE1 PACKAGE
#
# It is an AWK script that does the main job of convertion from
# METAPOST output to (raw) Type 1 format
# History:
# 20.04.2006: 0.40, another bug fixed in set_hint (a[5] and a[6]
#             used to be used instead of a[7] and a[8], respectively).
# 24.03.2006: ver. 0.39, a bug fixed in setting vstems using the old scheme
#             (hsb was not taken into account); local variable `k'
#             introduced in `find_stem3'
# 13-20.11.2005: ver. 0.385 adaptation to the new hinting scheme -- cont.
#             global hints are not collected (needed by old interpreters);
#             BJ: hit replacement corrected (param. stemx added in
#             hint_clash; clear_hint doest not touch triple stem data);
# 26.10.2005: adaptation to the new hinting scheme -- cont. (20.5->-20.5)
# 15.10.2005: beginnig of the adaptation to the new hinting scheme
# 09.07.2005: ver. 0.38, adaptation to the possibility of writing
#             implicit encodings (like StandardEncoding) and
#             to the handling of (optional) CharSet by afm2pfm
# 15.02.2005: ver. 0.37, doubled kerns and ligatures silently ignored by
#             default; they can be reported on demand by setting the
#             parameter NQ (Non-Quiet; newly introduced) to a `true' value;
#             messages prefixed with `MP2PF:'
# 18.09.2004: ver. 0.36, awk script no longer cares for fontdimen names
# 29.04.2003: ver. 0.35, a bug in gawk circumvented (in clear_hints)
# 18.01.2003: ver. 0.34, normal round function introduced; old one
#             renamed to fround (forced round); no more mess due
#             ADL comment in PFB and Ascender and Descender ones in AFM;
#             again fun. rational: superfluously robust ;-)
# 06.01.2003: ver. 0.33, fun. rational: unlikely case included (as a comment)
# 03.01.2003: ver. 0.32, fontdimens and headerbytes handled
# 31.07.2002: banner added
# 14.07.2002: comment (question) added in `pickup_stem'
# 22.09.2001: ver. 0.31 (remarks moved to an informal readme.his file)
# 26.01.2001: an empty set of KPX pairs admitted
# 14.01.2001: functions rational and approx added

########################################################################

# General utility functions

# Find a string describing a rational approximation of a real number
# Awk version was apparently based on "code kindly sent us by
# Berthold K. P. Horn"
sub rational {
  my($x,$nlimit,$dlimit)=@_;
  my($p0,$q0,$p1,$q1,$p2,$q2,$s,$ds);
  
  # handle zero, negative, and large
  return '0 1' if $x==0;
  return '-'.&rational(-$x,$nlimit,$dlimit) if $x<0.0;
  return &round($x) if $x>$nlimit;
  
  # loop over guesses until the numerator and denominator are too large
  $p0=0; $q0=1; $p1=1; $q1=0; $s=$x;
  while (1) {
  
    # check for loop termination with best guess
    if ((int($s)!=0) &&
        (($p1>($nlimit-$p0)/int($s)) || ($q1>($dlimit-$q0)/int($s)))) {
      $p2=$p1;
      $q2=$q1;
      last;
    }
    
    # try a new guess, terminate if we're lucky and it's exact
    $p2=$p0+int($s)*$p1;
    $q2=$q0+int($s)*$q1;
    last if $p2/$q2==$x;
    $ds=$s-int($s);
    last if $ds==0;
    $p0=$p1; $q0=$q1; $p1=$p2; $q1=$q2; $s=1/$ds;    
  }
  
  return "$p2 $q2";
}

# abs() is built-in in Perl and doesn't need to be defined as a function

sub min { return $_[0]<$_[1]?$_[0]:$_[1]; }
sub max { return $_[0]>$_[1]?$_[0]:$_[1]; }

sub round { return $_[0]>=0?int($_[0]+0.5):-int(-$_[0]+0.5); }

# "forced round" - round to nearest int, but complain about it
sub fround {
  my($x)=@_;
  
  if ($x!=int($x)) {
    &mess("MP2PF: WRONG ROUNDING IN METAPOST $x IN $name");
    return $x>=0?int($x+0.5):-int(-$x+0.5);
  } else {
    return $x;
  }
}

# sort space-separated words; we use Perl's instead of the Awk
# version's homemade bubble sort
sub trivial_sort {
  return join(' ',sort { $a <=> $b } split(' ',$_[0]));
}

# write an error message - /dev/tty and log file stuff removed
sub mess {
  print STDERR $_[0]."\n";
}

########################################################################

# Functions that generate Postscript code

# Generate Postscript code for a rational approximation
sub approx {
  my($x)=@_;
  my($r,$a,$b);
  
  # Awk version says:
  #   "32767 is a limit due to old (DOS?) implementations of t1utils"
  $r=&rational($x,32767,32767);
  ($a,$b)=split(' ',$r);
  return $b==1?$a:"$r div";
}

sub make_lineto {
  my($dx,$dy)=@_;

  if (($dx!=0) || ($dy!=0)) {
    if ($dx==0) {&store_pfb("\t".&fround($dy).' vlineto');}
    elsif ($dy==0) {&store_pfb("\t".&fround($dx).' hlineto');}
    else {&store_pfb("\t".&fround($dx).' '.&fround($dy).' rlineto');}
  }
}

sub make_moveto {
  my($dx,$dy)=@_;

  if (($dx!=0) || ($dy!=0)) {
    if ($dx==0) {&store_pfb("\t".&fround($dy).' vmoveto');}
    elsif ($dy==0) {&store_pfb("\t".&fround($dx).' hmoveto');}
    else {&store_pfb("\t".&fround($dx).' '.&fround($dy).' rmoveto');}
  }
}

sub make_curveto {
  my($dx1,$dy1,$dx2,$dy2,$dx3,$dy3)=@_;

  if (($dx1+$dx2+$dx3!=0) || ($dy1+$dy2+$dy3!=0)) {
    if (($dy1==0) && ($dx3==0)) {
      &store_pfb("\t".&fround($dx1).' '.&fround($dx2).' '
        .&fround($dy2).' '.&fround($dy3).' hvcurveto');
    } elsif (($dx1==0) && ($dy3==0)) {
      &store_pfb("\t".&fround($dy1).' '.&fround($dx2).' '
        .&fround($dy2).' '.&fround($dx3).' vhcurveto');
    } else {
      &store_pfb("\t".&fround($dx1).' '.&fround($dy1).' '.&fround($dx2).' '
        .&fround($dy2).' '.&fround($dx3).' '.&fround($dy3).' rrcurveto');
    }
  }
}

########################################################################

# Other functions

# extract static data from what was pfcommon.dat
sub get_data_files {
  my($s,$key,$a);
  
  @PFB_PRO=split(/\n/,<<EOF);
%!PS-AdobeFont-1.0: ##FONT_NAME## ##VERSION##
%%CreationDate: ##CREATION_DATE## 
% Generated by MetaType1 (a MetaPost-based engine)
% ##AUTHOR##
% ADL: ##ADL_ASCENDER## ##ADL_DESCENDER## ##ADL_LINESKIP##
%%EndComments
FontDirectory/##FONT_NAME## known{/##FONT_NAME## findfont dup/UniqueID known{dup
/UniqueID get 0 eq exch/FontType get 1 eq and}{pop false}ifelse
{save true}{false}ifelse}{false}ifelse
17 dict begin
/FontInfo 9 dict dup begin
/version(##VERSION##)readonly def
/Notice(##AUTHOR##)readonly def
/FullName(##FULL_NAME##)readonly def
/FamilyName(##FAMILY_NAME##)readonly def
/Weight(##WEIGHT##)readonly def
/isFixedPitch ##FIXED_PITCH## def
/ItalicAngle ##ITALIC_ANGLE## def
/UnderlinePosition ##UNDERLINE_POSITION## def
/UnderlineThickness ##UNDERLINE_THICKNESS## def
end readonly def
/FontName /##FONT_NAME## def
##ENCODING_DATA##
/PaintType 0 def
/FontType 1 def
/StrokeWidth 0 def
/FontMatrix[0.001 0 0 0.001 0 0]readonly def
%/UniqueID 0 def
/FontBBox{##FONT_BOUNDING_BOX##}readonly def
currentdict end
currentfile eexec
dup/Private 19 dict dup begin
/RD{string currentfile exch readstring pop}executeonly def
/ND{noaccess def}executeonly def
/NP{noaccess put}executeonly def
/MinFeature{16 16}ND
%/UniqueID 0 def
/StdHW[##STDHW##]def
/StdVW[##STDVW##]def
/StemSnapH[##STEMSNAPH##]def
/StemSnapV[##STEMSNAPV##]def
/ForceBold ##FORCE_BOLD## def
/password 5839 def
% Copyright (c) 1987-1990 Adobe Systems Incorporated
% All Rights Reserved.
% This code to be used for hint replacement only
/OtherSubrs
[ { } { } { }
{
systemdict /internaldict known not
{ pop 3 }
{ 1183615869 systemdict /internaldict get exec
dup /startlock known
{ /startlock get exec }
{ dup /strtlck known
{ /strtlck get exec }
{ pop 3 }
ifelse }
ifelse }
ifelse
} executeonly
] noaccess def
/Subrs ##NUMBER_OF_SUBRS## array
dup 0 {
	3 0 callothersubr
	pop
	pop
	setcurrentpoint
	return
	} NP
dup 1 {
	0 1 callothersubr
	return
	} NP
dup 2 {
	0 2 callothersubr
	return
	} NP
dup 3 {
	return
	} NP
dup 4 {
	1 3 callothersubr
	pop
	callsubr
	return
	} NP
##SUBROUTINES##
ND
2 index
/CharStrings ##NUMBER_OF_CHARSTRINGS## dict dup begin
/.notdef {
	0 280 hsbw
	endchar
	} ND
EOF

  @PFB_TRA=split(/\n/,<<EOF);
end end readonly put put
dup/FontName get exch definefont pop
mark currentfile closefile
cleartomark
{restore}if
EOF

  open(FD,$FD);
  while (<FD>) {
    chomp;
    s/\s+$//;
    if (/^(.*?) +: *(.*?)$/) {
      $font_data{$1}=$2;
    } else {
      &mess('MP2PF: IMPROPER FONT INFO FILE');
    }
  }
  close(FD);
}

sub store_pfb { push @pfb_text,$_[0]; }

sub flush_pfb {
  my($s,$i,$n);

  open(PFB,">$PFB");

  foreach $n (0..$#PFB_PRO) {
    $_=$PFB_PRO[$n];
    foreach $i (keys %font_data) {
      while (/^(.*)##$i##(.*)$/) {
        if ($font_data{$i} eq '') {
          $_='';
        } else {
          $_=$1.$font_data{$i}.$2;
        }
      }
    }

    $_='' if /##OTHER_BLUES##/;

    if (/##ENCODING_DATA##/) {
      if ($font_data{'ENCODING_NAME'} ne '') {
        $_='/Encoding '.$font_data{'ENCODING_NAME'}.' def';
      } else {
        $_="/Encoding 256 array\n"
          ."0 1 255 {1 index exch /.notdef put} for\n";
          foreach $i (0..255) {
            if (exists $enc_name[$i]) {
              $_.="dup $i/$enc_name[$i] put\n";
            }
          }
          $_.='readonly def';
      }
    }

    s/##FONT_BOUNDING_BOX##/$mllx $mlly $murx $mury/;
    if (/##STDHW##/) {
      if ($stdhw==0) {
        $_='';
      } else {
        s/##STDHW##/$stdhw/;
      }
    }
    if (/##STDVW##/) {
      if ($stdvw==0) {
        $_='';
      } else {
        s/##STVHW##/$stdvw/;
      }
    }
    if (/##STEMSNAPH##/) {
      if ($stdhw==0) {
        $_='';
      } else {
        s/##STEMSNAPH##/&tab2str($stemsnaph)/e;
      }
    }
    if (/##STEMSNAPV##/) {
      if ($stdvw==0) {
        $_='';
      } else {
        s/##STEMSNAPV##/&tab2str($stemsnapv)/e;
      }
    }
    s/##NUMBER_OF_SUBRS##/2+$subrs_base+$#subrs/e;
    $_='' if /##SUBROUTINES##/;
    s/##NUMBER_OF_CHARSTRINGS##/$num_enc_chars+$num_oth_chars+1/e;

    if (/(##[^#]+##)/) {
      mess("MP2PF: EXTRA TAG: $1");
    }

    print PFB "$_\n" if $_ ne '';
  }

  foreach (@pfb_text) {
    print PFB "$_\n" if $_ ne '';
  }

  foreach (@PFB_TRA) {
    print PFB "$_\n" if $_ ne '';
  }
  
  close(PFB);
}

########################################################################

# Main program

$tsuversion='UNKNOWN';
open(MAKEFILE,'Makefile');
while (<MAKEFILE>) {
  $tsuversion=$1 if /^VERSION\s*=\s*(\S+)/;
}
close(MAKEFILE);

&mess("This is mp2pf from Tsukurimashou $tsuversion "
  .'(converts MP EPSes to PS Type 1 fonts)');

$NAME=shift;

if ($NAME eq '') {
  &mess('MP2PF: NAME MUST NOT BE EMPTY');
  exit(1);
}

$AFM="$NAME.afm";
$PFB="$NAME.p";
$FD="$NAME.pfi";
$KD="$NAME.kpx";
$PL='piclist.tex';
$PL=$1.$PL if $NAME=~m!^(.*/)!;

$max_font_dimen=99; $max_header_byte=99;
$mllx=10000; $mlly=10000; $murx=-10000; $mury=-10000;

&get_data_files;

# dominant stems chosen manually have the highest priority:
$vstem_stat{$font_data{'STDVW'}}=10000 if defined $font_data{'STDVW'};
$hstem_stat{$font_data{'STDHW'}}=10000 if defined $font_data{'STDHW'};

# standard empty subr has number 3==subrs_base-1
$subrs_base=4; $xsubrs{''}=-1;

# the following code must be consistent with tsufb.mp
open(PL,$PL);
while (<PL>) {
  chomp;
  if (/EPSNAMEandNumber\{.*?\}\{([0-9]+)\}/i) {
    push @file,"$NAME.$1";
  }
}
close(PL);

foreach $curr_file (@file) {
  open(CURR_FILE,$curr_file);
  while (<CURR_FILE>) {
    @F=split(/\s+/,$_);

    if (/%%BoundingBox:/) {
      print STDERR "#" if ($n++)%4==0;
      $name=''; $code=0; $hsb=0; $width=0; $x0=0; $y0=0; # sentinels
      $curr_path=0; $acc_path=0;
      $hsb=$F[1]; $llx=$F[1]; $lly=$F[2]; $urx=$F[3]; $ury=$F[4];
      $mllx=$llx if $mllx>$llx; $mlly=$lly if $mlly>$lly;
      $murx=$urx if $murx<$urx; $mury=$ury if $mury<$ury;
    }

    if (/^%GLYNFO:/) {
      if ($F[1] eq 'NAME') {$name=$F[2]; $code=$F[3];}
      if ($F[1] eq 'HSBW') {
        $width=$F[3];
        $x0=$hsb; $y0=0;
      }
      if ($F[1] eq 'ACC') {$acc_path=$F[2];}
      if ($F[1] eq 'BEGINCHAR') {
        &store_pfb("/$name {\n\t".&fround($hsb).' '.&approx($width).' hsbw');
        if ($code>=0) {
          $num_enc_chars++;
          $enc_name[$code]=$name;
        } else {
          $num_oth_chars++;
        }
      }
    }
      
    if (/lineto/) {
      &make_lineto($F[0]-$x0,$F[1]-$y0);
      $x0=$F[0]; $y0=$F[1]
    } elsif (/curveto/) {
      &make_curveto($F[0]-$x0,$F[1]-$y0,$F[2]-$F[0],$F[3]-$F[1],
                    $F[4]-$F[2],$F[5]-$F[3]);
      $x0=$F[4]; $y0=$F[5];
    } elsif (/moveto/) {
      &make_moveto($F[1]-$x0,$F[2]-$y0);
      $x0=$F[1]; $y0=$F[2]; $x_path0=$x0; $y_path0=$y0;
    }
      
    if (/closepath/) {
      if (($x0!=$x_path0) || ($y0!=$y_path0)) {
        # closing with implicit `lineto'
        &store_pfb("\tclosepath");
      }
    }

    if (/showpage/) {
      &store_pfb("\tendchar\n\t} ND");
    }
  }

  close(CURR_FILE);
}
  
print STDERR "\n";

&flush_pfb;