Chip: Internet/Chip Internet.iso/viewer/gsnt/bdftops.ps

Text File | 1993-05-27 | 23KB | 749 lines

%    Copyright (C) 1990, 1991, 1993 Aladdin Enterprises.  All rights reserved.
%
% This file is part of Ghostscript.
%
% Ghostscript is distributed in the hope that it will be useful, but
% WITHOUT ANY WARRANTY.  No author or distributor accepts responsibility
% to anyone for the consequences of using it or for whether it serves any
% particular purpose or works at all, unless he says so in writing.  Refer
% to the Ghostscript General Public License for full details.
%
% Everyone is granted permission to copy, modify and redistribute
% Ghostscript, but only under the conditions described in the Ghostscript
% General Public License.  A copy of this license is supposed to have been
% given to you along with Ghostscript so you can know your rights and
% responsibilities.  It should be in a file named COPYING.  Among other
% things, the copyright notice and this notice must be preserved on all
% copies.

% bdftops.ps
% Convert a BDF file (possibly with (an) associated AFM file(s))
% to a Ghostscript font.

% Ghostscript fonts are in the same format as Adobe Type 1 fonts,
% except that they do not use eexec encryption.
% See gs_fonts.ps for more information.

/envBDF 120 dict def
envBDF begin

% "Import" the image-to-path package.
% This also brings in the Type 1 opcodes (type1ops.ps).
   (impath.ps) run

% "Import" the font-writing package.
   (wrfont.ps) run
   /encrypt_CharStrings true def

% Invert the StandardEncoding vector.
   256 dict dup begin
   0 1 255 { dup StandardEncoding exch get exch def } for
   end /decoding exch def

% Define the properties copied to FontInfo.
   mark
     (COPYRIGHT) /Notice
     (FAMILY_NAME) /FamilyName
     (FULL_NAME) /FullName
     (WEIGHT_NAME) /Weight
   .dicttomark /properties exch def

% Define the character sequences used to fill in some undefined entries
% in the standard encoding.
   mark
     (AE) [/A /E]
     (OE) [/O /E]
     (acute) [/quoteright]
     (ae) [/a /e]
     (bullet) [/asterisk]
     (cedilla) [/comma]
     (circumflex) [/asciicircum]
     (dieresis) [/quotedbl]
     (dotlessi) [/i]
     (ellipsis) [/period /period /period]
     (emdash) [/hyphen /hyphen /hyphen]
     (endash) [/hyphen /hyphen]
     (exclamdown) [/exclam]
     (fi) [/f /i]
     (fl) [/f /l]
     (florin) [/f]
     (fraction) [/slash]
     (germandbls) [/s /s]
     (grave) [/quoteleft]
     (guillemotleft) [/less /less]
     (guillemotright) [/greater /greater]
     (guilsinglleft) [/less]
     (guilsinglright) [/greater]
     (hungarumlaut) [/quotedbl]
     (oe) [/o /e]
     (periodcentered) [/asterisk]
     (questiondown) [/question]
     (quotedblbase) [/comma /comma]
     (quotedblleft) [/quotedbl]
     (quotedblright) [/quotedbl]
     (quotesinglbase) [/comma]
     (quotesingle) [/quoteright]
     (tilde) [/asciitilde]
   .dicttomark /composites exch def

% Note the characters that must be defined as subroutines.
   96 dict begin
     0 composites
      { exch pop
         { dup currentdict exch known
        { pop }
        { 1 index def 1 add }
       ifelse
     }
    forall
      }
     forall pop
     currentdict
   end /subrchars exch def

% Define the overstruck characters that can be synthesized with seac.
   mark
    [ /Aacute /Acircumflex /Adieresis /Agrave /Aring /Atilde
      /Ccedilla
      /Eacute /Ecircumflex /Edieresis /Egrave
      /Iacute /Icircumflex /Idieresis /Igrave
      /Lslash
      /Ntilde
      /Oacute /Ocircumflex /Odieresis /Ograve /Otilde
      /Scaron
      /Uacute /Ucircumflex /Udieresis /Ugrave
      /Yacute /Ydieresis
      /Zcaron
      /aacute /acircumflex /adieresis /agrave /aring /atilde
      /ccedilla
      /eacute /ecircumflex /edieresis /egrave
      /iacute /icircumflex /idieresis /igrave
      /lslash
      /ntilde
      /oacute /ocircumflex /odieresis /ograve /otilde
      /scaron
      /uacute /ucircumflex /udieresis /ugrave
      /yacute /ydieresis
      /zcaron
    ]
    { dup dup length string cvs
      [ exch dup 0 1 getinterval
        exch dup length 1 sub 1 exch getinterval
      ]
    } forall
     /cent [/c /slash]
     /daggerdbl [/bar /equal]
     /divide [/colon /hyphen]
     /sterling [/L /hyphen]
     /yen [/Y /equal]
   .dicttomark /accentedchars exch def

% ------ BDF file parsing utilities ------ %

% Define a buffer for reading the BDF file.
   /buffer 400 string def

% Read a line from the BDF file into the buffer.
% Define /keyword as the first word on the line.
% Define /args as the remainder of the line.
% If the keyword is equal to commentword, skip the line.
% (If commentword is equal to a space, never skip.)
   /nextline
    { bdfile buffer readline not
       { (Premature EOF\n) print stop } if
      ( ) search
       { /keyword exch def pop }
       { /keyword exch def () }
      ifelse
      /args exch def
      keyword commentword eq { nextline } if
    } bind def

% Get a word argument from args.  We do *not* copy the string.
   /warg        % warg -> string
    { args ( ) search
       { exch pop exch }
       { () }
      ifelse  /args exch def
    } bind def

% Get an integer argument from args.
   /iarg        % iarg -> int
    { warg cvi
    } bind def

% Get a numeric argument from args.
   /narg        % narg -> int|real
    { warg cvr
      dup dup cvi eq { cvi } if
    } bind def

% Convert the remainder of args into a string.
   /remarg        % remarg -> string
    { args copystring
    } bind def

% Get a string argument that occupies the remainder of args.
   /sarg        % sarg -> string
    { args (") anchorsearch
       { pop /args exch def } { pop } ifelse
      args args length 1 sub get (") 0 get eq
       { args 0 args length 1 sub getinterval /args exch def } if
      args copystring
    } bind def

% Check that the keyword is the expected one.
   /checkline        % (EXPECTED-KEYWORD) checkline ->
    { dup keyword ne
       { (Expected ) print =
         (Line=) print keyword print ( ) print args print (\n) print stop
       } if
      pop
    } bind def

% Read a line and check its keyword.
   /getline        % (EXPECTED-KEYWORD) getline ->
    { nextline checkline
    } bind def

% Find the first/last non-zero bit of a non-zero byte.
   /fnzb
    { 0 { exch dup 128 ge { pop exit } { dup add exch 1 add } ifelse }
      loop
    } bind def
   /lnzb
    { 7 { exch dup 1 and 0 ne { pop exit } { -1 bitshift exch 1 sub } ifelse }
      loop
    } bind def

% ------ Type 1 encoding utilities ------ %

% Parse the side bearing and width information that begins a CharString.
% Arguments: charstring.  Result: mark sbx wx substring *or*
% mark sbx sby wx wy substring.
   /parsesbw
    { mark exch lenIV
       {        % stack: mark ... string dropcount
         dup 2 index length exch sub getinterval
     dup 0 get dup 32 lt { pop exit } if
     dup 246 le
      { 139 sub exch 1 }
      { dup 250 le
         { 247 sub 8 bitshift 108 add 1 index 1 get add exch 2 }
         { dup 254 le
            { 251 sub 8 bitshift 108 add 1 index 1 get add neg exch 2 }
        { pop dup 1 get 128 xor 128 sub
          8 bitshift 1 index 2 get add
          8 bitshift 1 index 3 get add
          8 bitshift 1 index 4 get add exch 5
        } ifelse
         } ifelse
      } ifelse
       } loop
    } bind def

% Find the side bearing and width information that begins a CharString.
% Arguments: charstring.  Result: charstring sizethroughsbw.
   /findsbw
    { dup parsesbw counttomark 1 add 1 roll cleartomark skipsbw
    } bind def
   /skipsbw        % charstring sbwprefix -> sizethroughsbw
    { length 1 index length exch sub
      2 copy get 12 eq { 2 } { 1 } ifelse add
    } bind def

% Encode a number, and append it to a string.
% Arguments: str num.  Result: newstr.
   /concatnum
    { dup dup -107 ge exch 107 le and
       { 139 add 1 string dup 0 3 index put }
       { dup dup -1131 ge exch 1131 le and
          { dup 0 ge { 16#f694 } { neg 16#fa94 } ifelse add
        2 string dup 0 3 index -8 bitshift put
        dup 1 3 index 255 and put
      }
      { 5 string dup 0 255 put exch
        2 copy 1 exch -24 bitshift 255 and put
        2 copy 2 exch -16 bitshift 255 and put
        2 copy 3 exch -8 bitshift 255 and put
        2 copy 4 exch 255 and put
        exch
      }
     ifelse
       }
      ifelse exch pop concatstrings
    } bind def

% Encode a subroutine call for a given character, appending it to a string.
% Arguments: str subrindex.  Result: newstr.
   /concatcall
    { () exch concatnum
      s_callsubr concatstrings concatstrings
    } bind def

% ------ Point arithmetic utilities ------ %

   /ptadd { exch 4 -1 roll add 3 1 roll add } bind def

   /ptexch { 4 2 roll } bind def

   /ptneg { neg exch neg exch } bind def

   /ptsub { ptneg ptadd } bind def

% ------ The main program ------ %

   /readBDF        % infilename outfilename fontname encodingname
            %   uniqueID readBDF -> font
    { /uniqueID exch def
      /encoding exch def
      /fontname exch def
      /psname exch def
      /bdfname exch def
      gsave        % so we can set the CTM to the font matrix

%  Open the input files.  We don't open the output file until
%  we've done a minimal validity check on the input.
      bdfname (r) file /bdfile exch def
      /commentword ( ) def

%  Check for the STARTFONT.
      (STARTFONT) getline
      args (2.1) ne { (Not version 2.1\n) print stop } if

%  Initialize the font.
      /Font 20 dict def
      Font begin
      /FontName fontname def
      /PaintType 0 def
      /FontType 1 def
      /UniqueID uniqueID def
      /Encoding encoding cvx exec def
      /FontInfo 20 dict def
      /Private 20 dict def
      currentdict end currentdict end
      exch begin begin        % insert font above environment

%  Initialize the Private dictionary in the font.
      Private begin
      /-! {string currentfile exch readhexstring pop} readonly def
      /-| {string currentfile exch readstring pop} readonly def
      /|- {readonly def} readonly def
      /| {readonly put} readonly def
      /BlueValues [] def
      /lenIV lenIV def
      /MinFeature {16 16} def
      /password 5839 def
      /UniqueID uniqueID def
      end        % Private

%  Now open the output file.
      psname (w) file /psfile exch def

%  Put out a header compatible with the Adobe "standard".
      (%!FontType1-1.0: ) ws fontname wt (000.000) wl
      (% This is a font description converted from ) ws
        bdfname wl
      (%   by bdftops running on revision ) ws
      revision wt (of (a) ) ws
      statusdict /product get ws (.) wl

%  Copy the initial comments, up to FONT.
      true
      { nextline
        keyword (COMMENT) ne {exit} if
    { (% Here are the initial comments from the BDF file:\n%) wl
    } if false
    (%) ws remarg wl
      } loop pop
      /commentword (COMMENT) def    % do skip comments from now on

%  Read and process the FONT, SIZE, and FONTBOUNDINGBOX.
      % If we cared about FONT, we'd use it here.  If the BDF files
      % from MIT had PostScript names rather than X names, we would
      % care; but what's there is unusable, so we discard FONT.
      (FONT) checkline
      (SIZE) getline
        /pointsize iarg def   /xres iarg def   /yres iarg def
      (FONTBOUNDINGBOX) getline
        /fbbw iarg def   /fbbh iarg def   /fbbxo iarg def   /fbbyo iarg def
    /fraster fbbw 7 add 8 idiv def
      nextline

% Allocate the buffers for the bitmap and the outline,
% according to the font bounding box.
      /bits fraster fbbh mul 200 max 65535 min string def
      /outline bits length 6 mul 65535 min string def

%  The Type 1 font machinery really only works with a 1000 unit
%  character coordinate system.  Set this up here.

% Compute the factor to make the X entry in the FontMatrix
% come out at exactly 0.001.
      /fontscale   72 pointsize div xres div 1000 mul   def
      Font /FontBBox
       [ fbbxo fontscale mul
     fbbyo fontscale mul
     fbbxo fbbw add fontscale mul
     fbbyo fbbh add fontscale mul
       ] cvx readonly
      put

%  Read and process the properties.  We only care about a few of them.
      keyword (STARTPROPERTIES) eq
       { iarg
          { nextline
        properties keyword known
         { FontInfo properties keyword get sarg readonly put
         } if
      } repeat
         (ENDPROPERTIES) getline
     nextline
       } if

%  Compute and set the FontMatrix.
      Font /FontMatrix
       [ 0.001 0 0 0.001 xres mul yres div 0 0 ] readonly
      dup setmatrix put

%  Read and process the header for the bitmaps.
      (CHARS) checkline
        /ccount iarg def

%  Initialize the character subroutine table and the CharStrings dictionary.
      /subrs subrchars length array def
      /subrsbw subrchars length array def
      /subrcount 0 def
      /charstrings ccount composites length add
        accentedchars length add 1 add dict def        % 1 add for .notdef
      /isfixedwidth true def
      /fixedwidth null def

%  Read and process the bitmap data.  This reads the remainder of the file.
      ccount -1 1
       { (STARTCHAR) getline
           /charname remarg def
     (/) print charname print
       10 mod 1 eq { (\n) print flush } if
     (ENCODING) getline        % Ignore, assume StandardEncoding
     (SWIDTH) getline
       /swx iarg pointsize mul 1000 div xres mul 72 div def
       /swy iarg pointsize mul 1000 div xres mul 72 div def
     (DWIDTH) getline        % Ignore, use SWIDTH instead
     (BBX) getline
       /bbw iarg def  /bbh iarg def  /bbox iarg def  /bboy iarg def
     nextline
     keyword (ATTRIBUTES) eq
      { nextline
      } if
     (BITMAP) checkline

%  Read the bits for this character.
     bbw 7 add 8 idiv /raster exch def
% The bitmap handed to type1imagepath must have the correct height,
% because type1imagepath uses this to compute the scale factor,
% so we have to clear the unused parts of it.
     bits dup 0 1 raster fbbh mul 1 sub
      { 0 put dup } for
     pop pop
     raster fbbh bbh sub mul   raster   raster fbbh 1 sub mul
      { bits exch raster getinterval
        bdfile buffer readline not
         { (EOF in bitmap\n) print stop } if
        % stack has <bits.interval> <buffer.interval>
        0 () /SubFileDecode filter
        exch 2 copy readhexstring pop pop pop closefile
      } for
     (ENDCHAR) getline

%  Compute the font entry, converting the bitmap to an outline.
     bits 0 raster fbbh mul getinterval    % the bitmap image
     bbw   fbbh                % bitmap width & height
     swx   swy                % width x & y
     bbox neg   bboy neg            % origin x & y
         % Account for lenIV when converting the outline.
     outline  lenIV  outline length lenIV sub  getinterval
     type1imagepath
     length lenIV add
     outline exch 0 exch getinterval

% Check for a fixed width font.
     isfixedwidth
      { fixedwidth null eq
         { /fixedwidth swx def }
         { fixedwidth swx ne { /isfixedwidth false def } if }
        ifelse
      } if

% Check whether this character must be a subroutine.
% If so, strip off the initial [h]sbw, replace the endchar by a return,
% and put the charstring in the Subrs array.
     subrchars charname known
      { /charstr exch def
        /csindex subrchars charname get def
        charstr parsesbw counttomark 1 add 1 roll
          counttomark 2 eq { 0 exch 0 } if ]
          subrsbw exch csindex exch put
          charstr exch skipsbw /charend exch def pop
        charstr charstr length 1 sub c_return put
        subrs   csindex
          charstr   charend lenIV sub   dup charstr length exch sub
            getinterval copystring
        put
        charstr 0 charend getinterval
          () subrchars charname get concatcall s_endchar concatstrings
          concatstrings
        /subrcount subrcount 1 add def
      }
      { copystring }
     ifelse
     charname exch charstrings 3 1 roll put
       } for
      (ENDFONT) getline

%  Synthesize missing characters out of available ones.
%  For fixed-width fonts, only do this in the 1-for-1 case.
      composites
       { 1 index charstrings exch known
          { pop pop }
      { dup isfixedwidth
         { dup length 1 eq }
         { true }
        ifelse
        exch { charstrings exch known and } forall
         { ( /) print 1 index bits cvs print
           dup length 1 eq
            { 0 get charstrings exch get copystring }
        { % Top of stack is array of characters to combine.
          % Convert to an array of subr indices.
          [ exch { subrchars exch get } forall ]
          % The final width is the sum of the widths of all
          % the characters, minus the side bearings of all the
          % characters except the first.  After each character
          % except the last, do a setcurrentpoint of its width
          % minus its side bearing (except for the first character);
          % before each character except the first, do a 0 hmoveto.
          % Fortunately, all this information is available in subrsbw.
          /combine exch def
          lenIV string
          % Compute the total width.
          subrsbw combine 0 get get aload pop pop pop 2 copy
          combine
           { subrsbw exch get
             aload pop ptexch ptsub ptadd
           } forall
          % Encode the combined side bearing and width.
          dup 3 index or 0 eq
           { pop exch pop 2 array astore s_hsbw }
           { 4 array astore s_sbw }
          ifelse
          3 1 roll { concatnum } forall exch concatstrings
          % Encode the subroutine calls, except the last.
          subrsbw combine 0 get get aload pop ptexch pop pop
          0 1 combine length 2 sub
           { combine exch get /ccsi exch def
             2 copy 5 -1 roll ccsi concatcall
             3 -1 roll concatnum exch concatnum
             s_setcurrentpoint_hmoveto concatstrings
             subrsbw ccsi get aload pop ptexch ptsub
             5 -2 roll ptadd
           } for
          % Encode the last call.
          pop pop
          combine dup length 1 sub get concatcall
          s_endchar concatstrings
        } ifelse
           charstrings 3 1 roll put
         }
         { pop pop }
        ifelse
      }
     ifelse
       }
      forall flush

%  Synthesize accented characters with seac if needed and possible.
      accentedchars
       { aload pop /accent exch def /base exch def
         buffer cvs /accented exch def
     charstrings accented known not
     charstrings base known and
     charstrings accent known and
      { ( /) print accented print
        charstrings base get findsbw 0 exch getinterval
        /acstring exch def        % start with sbw of base
        charstrings accent get parsesbw
        counttomark 1 sub { pop } repeat    % just leave mark & sbx
        acstring exch concatnum exch pop    % pop the mark
        0 concatnum 0 concatnum        % adx ady
        decoding base get concatnum        % bchar
        decoding accent get concatnum    % achar
        s_seac concatstrings
        charstrings exch accented copystring exch put
      } if
       } forall

%  Make a CharStrings entry for .notdef.
      outline lenIV <8b8b0d0e> putinterval    % 0 0 hsbw endchar
      charstrings /.notdef outline 0 lenIV 4 add getinterval copystring put

%  Encrypt the CharStrings and Subrs (in place).
      charstrings dup begin
       { 4330 exch dup .type1encrypt exch pop
         readonly def
       }
      forall end
      0 1 subrs length 1 sub
       { dup subrs exch get dup null ne
      { 4330 exch dup .type1encrypt exch pop
        subrs 3 1 roll put
      }
      { pop pop }
     ifelse
       }
      for

%  Make most of the remaining entries in the font dictionaries.
      Font /CharStrings charstrings readonly put
      FontInfo /FullName known not
       { % Some programs insist on FullName being present.
         FontInfo /FullName FontName dup length string cvs put
       }
      if
      FontInfo /isFixedPitch isfixedwidth put
      subrcount 0 gt
       { Private /Subrs subrs readonly put
       } if

%  Determine the italic angle and underline position
%  by actually installing the font.
      save
      /_temp_ Font definefont setfont
      [1000 0 0 1000 0 0] setmatrix        % mitigate rounding problems
% The italic angle is the multiple of -5 degrees
% that minimizes the width of the 'I'.
      0 9999 0 5 85
       { dup rotate
         newpath 0 0 moveto (I) false charpath
     dup neg rotate
         pathbbox pop exch pop exch sub
     dup 3 index lt { 4 -2 roll } if
     pop pop
       }
      for pop
% The underline position is halfway between the bottom of the 'A'
% and the bottom of the FontBBox.
      newpath 0 0 moveto (A) false charpath
      FontMatrix concat
      pathbbox pop pop exch pop
%  Put the values in FontInfo.
      3 -1 roll restore
      Font /FontBBox get 1 get add 2 div cvi
      dup FontInfo /UnderlinePosition 3 -1 roll put
      2 div abs FontInfo /UnderlineThickness 3 -1 roll put
      FontInfo /ItalicAngle 3 -1 roll put

%  Clean up and finish.
      grestore
      bdfile closefile
      Font currentdict end end begin        % remove font from dict stack
      (\n) print flush

    } bind def

% ------ Reader for AFM files ------ %

% Dictionary for looking up character keywords
   /cmdict 6 dict dup begin
      /C { /c iarg def } def
      /N { /n warg copystring def } def
      /WX { /w narg def } def
      /W0X /WX load def
      /W /WX load def
      /W0 /WX load def
   end def

   /readAFM        % fontdict afmfilename readAFM -> fontdict
    { (r) file /bdfile exch def
      /Font exch def
      /commentword (Comment) def

%  Check for the StartFontMetrics.
      (StartFontMetrics) getline
      args cvr 2.0 lt { (Not version 2.0 or greater\n) print stop } if

%  Look for StartCharMetrics, then parse the character metrics.
%  The only information we care about is the X width.
      /metrics 0 dict def
       { nextline
         keyword (EndFontMetrics) eq { exit } if
     keyword (StartCharMetrics) eq
      { iarg dup dict /metrics exch def
         { /c -1 def /n null def /w null def
           nextline buffer
            { token not { exit } if
          dup cmdict exch known
           { exch /args exch def   cmdict exch get exec   args }
           { pop }
          ifelse
        } loop
           c 0 ge n null ne or w null ne and
            { n null eq { /n Font /Encoding get c get def } if
          metrics n w put
        }
           if
         }
        repeat
        (EndCharMetrics) getline
      } if
       } loop

%  Insert the metrics in the font.
       metrics length 0 ne
        { Font /Metrics metrics readonly put
    } if
      Font
    } bind def

end        % envBDF

% Enter the main program in the current dictionary.
/bdftops
 { [] exch bdfafmtops
 } bind def
/bdfafmtops        % infilename afmfilename* outfilename fontname
            %   encoding uniqueID
 { envBDF begin
     6 -2 roll exch 6 2 roll    % afm* in out fontname encoding uniqueID
     readBDF        % afm* font
     exch { readAFM } forall
     save exch
     dup /FontName get exch definefont
     setfont
     psfile writefont
     restore
     psfile closefile
   end
 } bind def

% If the program was invoked from the command line, run it now.
[ shellarguments
 { counttomark 4 ge
    { dup 0 get
      dup 48 ge exch 57 le and        % last arg starts with a digit?
       { cvi /StandardEncoding }        % no encodingname
       { cvn exch cvi exch }            % have encodingname
      ifelse
      counttomark 4 roll
      counttomark 5 sub array astore
      6 -4 roll exch
      bdfafmtops
    }
    { cleartomark
      (Usage: bdftops xx.bdf [yy1.afm ...] zz.gsf fontname uniqueID [encodingname]\n) print flush
      mark
    }
   ifelse
 }
if pop