harvey/sys/src/cmd/gs/lib/gs_fonts.ps

%    Copyright (C) 1990, 2000 Aladdin Enterprises.  All rights reserved.
% 
% This file is part of AFPL Ghostscript.
% 
% AFPL Ghostscript is distributed with NO WARRANTY OF ANY KIND.  No author or
% distributor accepts any responsibility for the consequences of using it, or
% for whether it serves any particular purpose or works at all, unless he or
% she says so in writing.  Refer to the Aladdin Free Public License (the
% "License") for full details.
% 
% Every copy of AFPL Ghostscript must include a copy of the License, normally
% in a plain ASCII text file named PUBLIC.  The License grants you the right
% to copy, modify and redistribute AFPL Ghostscript, but only under certain
% conditions described in the License.  Among other things, the License
% requires that the copyright notice and this notice be preserved on all
% copies.

% $Id: gs_fonts.ps,v 1.13.2.1 2002/01/25 06:33:09 rayjj Exp $
% Font initialization and management code.

% Define the default font.
/defaultfontname /Courier def

% Define the name of the font map file.
/defaultfontmap (Fontmap) def

% ------ End of editable parameters ------ %

% Define the UniqueIDs and organization XUID assigned to Aladdin.
% UniqueIDs 5,066,501 - 5,066,580 are assigned as follows:
%   01 and 02 for shareware Cyrillic
%   33 through 67 for Type 1 versions of the Hershey fonts
% UniqueIDs 5,115,501 - 5,115,600 are currently unassigned.
/AladdinEnterprisesXUID 107 def

% If SUBSTFONT is defined, make it the default font.
/SUBSTFONT where { pop /defaultfontname /SUBSTFONT load def } if

% Define a reliable way of accessing FontDirectory in systemdict.
/.FontDirectory
{ /FontDirectory .systemvar
} .bind odef

% If DISKFONTS is true, we load individual CharStrings as they are needed.
% (This is intended primarily for machines with very small memories.)
% In this case, we define another dictionary, parallel to FontDirectory,
% that retains an open file for every font loaded.
/FontFileDirectory 10 dict def

% Define a temporary string for local use, since using =string
% interferes with some PostScript programs.
/.fonttempstring 128 string def

% Split up a search path into individual directories or files.
/.pathlist		% <path> .pathlist <dir1|file1> ...
 {  { dup length 0 eq { pop exit } if
      .filenamelistseparator search not { exit } if
      exch pop exch
    }
   loop
 } bind def

% Load a font name -> font file name map.
userdict /Fontmap .FontDirectory maxlength dict put
/.loadFontmap {		% <file> .loadFontmap -
		% We would like to simply execute .definefontmap as we read,
		% but we have to maintain backward compatibility with an older
		% specification that makes later entries override earlier
		% ones within the same file.
   50 dict exch .readFontmap
    { .definefontmap } forall
} bind def
/.readFontmap {		% <dict> <file> .readFontmap <dict>
    { dup token not { closefile exit } if
		% stack: dict file fontname
      % This is a hack to get around the absurd habit of MS-DOS editors
      % of adding an EOF character at the end of the file.
      dup (\032) eq { pop closefile exit } if
      1 index token not
       { (Fontmap entry for ) print dup =only
	 ( has no associated file or alias name!  Giving up.) = flush
	 {.readFontmap} 0 get 1 .quit
       } if
      dup type dup /stringtype eq exch /nametype eq or not
       { (Fontmap entry for ) print 1 index =only
	 ( has an invalid file or alias name!  Giving up.) = flush
	 {.readFontmap} 0 get 1 .quit
       } if
		% stack: dict file fontname filename|aliasname
      1 index type /stringtype eq
      1 index type /nametype eq and 1 index xcheck and
      1 index /run eq 2 index /.runlibfile eq or and {
		% This is an inclusion entry.
	pop findlibfile { exch pop } { file } ifelse
	2 index exch .readFontmap pop
      } {
		% This is a real entry.
		% Read and pop tokens until a semicolon.
       { 2 index token not
	  { (Fontmap entry for ) print 1 index =only
	    ( ends prematurely!  Giving up.) = flush
	    {.loadFontmap} 0 get 1 .quit
	  } if
	 dup /; eq { pop 3 index 3 1 roll .growput exit } if
	 pop
       } loop
      } ifelse
    } loop
} bind def
% Add an entry in Fontmap.  We redefine this if the Level 2
% resource machinery is loaded.
/.definefontmap			% <fontname> <file|alias> .definefontmap -
 {		% Since Fontmap is global, make sure the values are storable.
   .currentglobal 3 1 roll true .setglobal
   dup type /stringtype eq
    { dup .gcheck not { dup length string copy } if
    }
   if
   Fontmap 3 -1 roll 2 copy .knownget
    {		% Add an element to the end of the existing value,
		% unless it's the same as the current last element.
      mark exch aload pop counttomark 4 add -1 roll
      2 copy eq { cleartomark pop pop } { ] readonly .growput } ifelse
    }
    {		% Make a new entry.
      mark 4 -1 roll ] readonly .growput
    }
   ifelse .setglobal
 } bind def

% Parse a font file just enough to find the FontName or FontType.
/.findfontvalue {	% <file> <key> .findfontvalue <value> true
			% <file> <key> .findfontvalue false
			% Closes the file in either case.
  exch dup read not { -1 } if
  2 copy unread 16#80 eq {
    dup (xxxxxx) readstring pop pop		% skip .PFB header
  } if
  {		% Stack: key file
		% Protect ourselves against syntax errors here.
    dup { token } stopped { pop false exit } if
    not { false exit } if		% end of file
    dup /eexec eq { pop false exit } if		% reached eexec section
    dup /Subrs eq { pop false exit } if		% Subrs without eexec
    dup /CharStrings eq { pop false exit } if	% CharStrings without eexec
    dup 3 index eq
     { xcheck not { dup token exit } if }	% found key
     { pop }
    ifelse
  } loop
		% Stack: key file value true   (or)
		% Stack: key file false
  dup { 4 } { 3 } ifelse -2 roll closefile pop
} bind def
/.findfontname
 { /FontName .findfontvalue
 } bind def

% If there is no FONTPATH, try to get one from the environment.
NOFONTPATH { /FONTPATH () def } if
/FONTPATH where
 { pop }
 { /FONTPATH (GS_FONTPATH) getenv not { () } if def }
ifelse
FONTPATH length 0 eq { (%END FONTPATH) .skipeof } if
/FONTPATH [ FONTPATH .pathlist ] def

% Scan directories looking for plausible fonts.  "Plausible" means that
% the file begins with %!PS-AdobeFont or %!FontType1, or with \200\001
% followed by four arbitrary bytes and then either of these strings.
% To speed up the search, we skip any file whose name appears in
% the Fontmap (with any extension and upper/lower case variation) already,
% and any file whose extension definitely indicates it is not a font.
%
% NOTE: The current implementation of this procedure is somewhat Unix/DOS-
% specific.  It assumes that '/' and '\' are directory separators, and that
% the part of a file name following the last '.' is the extension.
%
/.lowerstring		% <string> .lowerstring <lowerstring>
 { 0 1 2 index length 1 sub
    { 2 copy get dup 65 ge exch 90 le and
       { 2 copy 2 copy get 32 add put }
     if pop
    }
   for
 } bind def
/.splitfilename {	% <dir.../base.extn> .basename <base> <extn>
		% Make the file name read-only to detect aliasing bugs.
		% We really don't like doing this, but we've had one
		% such bug already.
  readonly {
    (/) search { true } { (\\) search } ifelse { pop pop } { exit } ifelse
  } loop
  dup { (.) search { pop pop } { exit } ifelse } loop
  2 copy eq {
    pop ()
  } {
    exch dup length 2 index length 1 add sub 0 exch getinterval exch
  } ifelse
} bind def
/.scanfontdict 1 dict def		% establish a binding
/.scanfontbegin
 {	% Construct the table of all file names already in Fontmap.
   currentglobal true setglobal
   .scanfontdict dup maxlength Fontmap length 2 add .max .setmaxlength
   Fontmap
    { exch pop
       { dup type /stringtype eq
	  { .splitfilename pop .fonttempstring copy .lowerstring cvn
	    .scanfontdict exch true put
	  }
	  { pop
	  }
	 ifelse
       }
      forall
    }
   forall
   setglobal
 } bind def
/.scanfontskip mark
		% Strings are converted to names anyway, so....
  /afm true
  /bat true
  /c true
  /cmd true
  /com true
  /dir true
  /dll true
  /doc true
  /drv true
  /exe true
  /fon true
  /fot true
  /h true
  /o true
  /obj true
  /pfm true
  /pss true		% Adobe Multiple Master font instances
  /txt true
.dicttomark def
/.scan1fontstring 128 string def
% %%BeginFont: is not per Adobe documentation, but a few fonts have it.
/.scanfontheaders [(%!PS-Adobe*) (%!FontType*) (%%BeginFont:*)] def
0 .scanfontheaders { length max } forall 6 add	% extra for PFB header
/.scan1fontfirst exch string def
/.scanfontdir		% <dirname> .scanfontdir -
 { currentglobal exch true setglobal
   QUIET not { (Scanning ) print dup print ( for fonts...) print flush } if
   (*) 1 index .filenamedirseparator
   dup (\\) eq { pop (\\\\) } if	% double \ for pattern match
   exch concatstrings concatstrings
   0 0 0 4 -1 roll	% found scanned files
    {		% stack: <fontcount> <scancount> <filecount> <filename>
      exch 1 add exch                   % increment filecount
      dup .splitfilename .fonttempstring copy .lowerstring
		% stack: <fontcount> <scancount> <filecount+1> <filename>
		%	<BASE> <ext>
      .scanfontskip exch known exch .scanfontdict exch known or
       { pop
		% stack: <fontcount> <scancount> <filecount+1>
       }
       { 3 -1 roll 1 add 3 1 roll
		% stack: <fontcount> <scancount+1> <filecount+1> <filename>
	 dup (r) { file } .internalstopped
	  { pop pop null ()
		% stack: <fontcount> <scancount+1> <filecount+1> <filename>
		%	null ()
	  }
	  {
		% On some platforms, the file operator will open directories,
		% but an error will occur if we try to read from one.
		% Handle this possibility here.
	    dup .scan1fontfirst { readstring } .internalstopped
	     { pop pop () }
	     { pop }
	    ifelse
		% stack: <fontcount> <scancount+1> <filecount+1>
		%	<filename> <file> <header>
	  }
	 ifelse
		% Check for PFB file header.
	 dup (\200\001????*) .stringmatch
	  { dup length 6 sub 6 exch getinterval }
	 if
		% Check for font file headers.
	 false .scanfontheaders
	  { 2 index exch .stringmatch or
	  }
	 forall exch pop
	  {	% stack: <fontcount> <scancount+1> <filecount+1> <filename>
		%	<file>
	    dup 0 setfileposition .findfontname
	     { dup Fontmap exch known
		{ pop pop
		}
		{ exch copystring exch
		  DEBUG { ( ) print dup =only flush } if
		  1 index .definefontmap
		  .splitfilename pop true .scanfontdict 3 1 roll .growput
			% Increment fontcount.
		  3 -1 roll 1 add 3 1 roll
		}
	       ifelse
	     }
	     { pop
	     }
	    ifelse
	  }
		% .findfontname will have done a closefile in the above case.
	  { dup null eq { pop } { closefile } ifelse pop
	  }
	 ifelse
       }
      ifelse
    }
   .scan1fontstring filenameforall
   QUIET
    { pop pop pop }
    { ( ) print =only ( files, ) print =only ( scanned, ) print
      =only ( new fonts.) = flush
    }
   ifelse
   setglobal
 } bind def

%END FONTPATH

% Create the dictionary that registers the .buildfont procedure (called by
% definefont) for each FontType.
/buildfontdict 20 dict def

% Register Type 3 fonts, which are always supported, for definefont.
buildfontdict 3 /.buildfont3 cvx put

% Register Type 0 fonts if they are supported.  Strictly speaking,
% we should do this in its own file (gs_type0.ps), but since this is
% the only thing that would be in that file, it's simpler to put it here.
/.buildfont0 where { pop buildfontdict 0 /.buildfont0 cvx put } if

% Define definefont.  This is a procedure built on a set of operators
% that do all the error checking and key insertion.
/.growfontdict
 {	% Grow the font dictionary, if necessary, to ensure room for an
	% added entry, making sure there is at least one slot left for FID.
   dup maxlength 1 index length sub 2 lt
    { dup dup wcheck
       { .growdict }
       { .growdictlength dict .copydict }
      ifelse
    }
    { dup wcheck not { dup maxlength dict .copydict } if
    }
   ifelse
 } bind def 
/.completefont {
  {		% Check for disabled platform fonts.
      NOPLATFONTS
       {	% Make sure we leave room for FID.
	 .growfontdict dup /ExactSize 0 put
       }
       {	% Hack: if the Encoding looks like it might be the
		% Symbol or Dingbats encoding, load those now (for the
		% benefit of platform font matching) just in case
		% the font didn't actually reference them.
		% Note that some types of font don't have an Encoding.
	 dup /Encoding .knownget {
	   dup length 65 ge {
	     64 get
	     dup /congruent eq { SymbolEncoding pop } if
	     /a9 eq { DingbatsEncoding pop } if
	   } {
	     pop
	   } ifelse
	 } if
       }
      ifelse
      true exch
		% If this is a CIDFont, CIDFontType takes precedence
		% over FontType.
      dup /CIDFontType known {
	/.buildcidfont where {
	  pop exch not exch	% true => false
	} if
      } if
      exch {
	dup /FontType get //buildfontdict exch get exec
      } {
	.buildcidfont
      } ifelse

      DISKFONTS
       { FontFileDirectory 2 index known
	  { dup /FontFile FontFileDirectory 4 index get .growput
	  }
	 if
       }
      if
      readonly		% stack: name fontdict
  } stopped { /invalidfont signalerror } if
} bind odef
/definefont
 { .completefont
		% If the current allocation mode is global, also enter
		% the font in LocalFontDirectory.
   .currentglobal
    { //systemdict /LocalFontDirectory .knownget
       { 2 index 2 index .growput }
      if
    }
   if
   dup .FontDirectory 4 -2 roll .growput
		% If the font originated as a resource, register it.
   currentfile .currentresourcefile eq { dup .registerfont } if
 } odef

% Define a procedure for defining aliased fonts.
% We use this only for explicitly aliased fonts, not substituted fonts:
% we think this matches the observed behavior of Adobe interpreters.
/.aliasfont		% <name> <font> .aliasfont <newFont>
 { .currentglobal 3 1 roll dup .gcheck .setglobal
   dup length 2 add dict
   dup 3 -1 roll { 1 index /FID eq { pop pop } { put dup } ifelse } forall
		% Stack: global fontname newfont newfont.
		% We might be defining a global font whose FontName
		% is a local string.  This is weird, but legal,
		% and doesn't cause problems anywhere else:
		% to avoid any possible problems in this case, do a cvn.
		% We might also be defining (as an alias) a global font
		% whose FontName is a local non-string, if someone passed a
		% garbage value to findfont.  In this case, just don't
		% call definefont at all.
   2 index dup type /stringtype eq exch .gcheck or 1 index .gcheck not or
    { /FontName 3 index dup type /stringtype eq { cvn } if put
		% Don't bind in definefont, since Level 2 redefines it.
      /definefont .systemvar exec
    }
    { .completefont pop exch pop
    }
   ifelse exch .setglobal
 } odef		% so findfont will bind it

% Define .loadfontfile for loading a font.  If we recognize Type 1 and/or
% TrueType fonts, gs_type1.ps and/or gs_ttf.ps will redefine this.
/.loadfontfile {
		% According to Ed Taft, Adobe interpreters push userdict
		% before loading a font, and pop it afterwards.
  userdict begin
    cvx exec
  end
} bind def
/.loadfont
 {		% Some buggy fonts leave extra junk on the stack,
		% so we have to make a closure that records the stack depth
		% in a fail-safe way.
   {{.loadfontfile} .execasresource} count 1 sub 2 .execn
   count exch sub { pop } repeat
 } bind def

% Find an alternate font to substitute for an unknown one.
% We go to some trouble to parse the font name and extract
% properties from it.  Later entries take priority over earlier.
/.substitutefaces [
	% Guess at suitable substitutions for random unknown fonts.
  [(Book) /NewCenturySchlbk 0]
  [(Grot) /Helvetica 0]
  [(Roman) /Times 0]
  [(Chancery) /ZapfChancery-MediumItalic 0]
	% If the family name appears in the font name,
	% use a font from that family.
  [(Arial) /Helvetica 0]
  [(Avant) /AvantGarde 0]
  [(Bookman) /Bookman 0]
  [(Century) /NewCenturySchlbk 0]
  [(Cour) /Courier 0]
  [(Frut) /Helvetica 0]
  [(Garamond) /Palatino 0]
  [(Geneva) /Helvetica 0]
  [(Helv) /Helvetica 0]
  [(NewYork) /Bookman 0]
  [(Pala) /Palatino 0]
  [(Schlbk) /NewCenturySchlbk 0]
  [(Swiss) /Helvetica 0]
  [(Symbol) /Symbol 0]
  [(Times) /Times 0]
	% Substitute for Adobe Multiple Master fonts.
  [(Minion) /Times 0]
  [(Myriad) /Helvetica 0]
	% If the font wants to be monospace, use Courier.
  [(Monospace) /Courier 0]
  [(Typewriter) /Courier 0]
	% Define substitutes for the other Adobe PostScript 3 fonts.
	% For some of them, the substitution is pretty bad!
  [(Albertus) /Palatino 0]
  [(AntiqueOlive) /Helvetica 0]
  [(Bodoni) /NewCenturySchlbk 0]
  [(Chicago) /Helvetica 2]
  [(Clarendon) /Bookman 0]
  [(Cooper) /NewCenturySchlbk 0]
  [(Copperplate) /AvantGarde 0]	% inappropriate, small-cap font
  [(Coronet) /ZapfChancery-MediumItalic 0]
  [(Eurostile) /Helvetica 0]
  [(Geneva) /Courier 2]		% should be fixed-pitch sans demi
  [(GillSans) /Helvetica 2]
  [(GillSans-Light) /Helvetica 0]
  [(Goudy) /Palatino 0]
  [(Hoefler) /NewCenturySchlbk 0]
  [(Joanna) /Times 0]
  [(LetterGothic) /Courier 0]	% should be fixed-pitch sans
  [(LubalinGraph-Book) /Bookman 2]
  [(LubalinGraph-Demi) /Bookman 0]
  [(Marigold) /ZapfChancery-MediumItalic 0]
  [(MonaLisa-Recut) /Palatino 0]	% inappropriate
  [(Monaco) /Courier 2]		% should be fixed-pitch sans demi
  [(Optima) /Helvetica 0]
  [(Oxford) /ZapfChancery-MediumItalic 0]
  [(Tekton) /Helvetica 0]
  [(Univers) /Helvetica 0]
] readonly def
/.substituteproperties [
  [(It) 9] [(Oblique) 1]
  [(Black) 2] [(Bd) 2] [(Bold) 2] [(bold) 2] [(Demi) 2] [(Heavy) 2] [(Sb) 2]
  [(Cn) 4] [(Cond) 4] [(Narrow) 4] [(Pkg) 4] [(Compr) 4]
  [(Serif) 8] [(Sans) -8]
] readonly def
/.fontnameproperties {		% <int> <string|name> .fontnameproperties
				%   <int'>
  .fontnamestring
  .substituteproperties {
    2 copy 0 get search {
      pop pop pop dup length 1 sub 1 exch getinterval 3 -1 roll exch {
	dup 0 ge { or } { neg not and } ifelse
      } forall exch
    } {
      pop pop
    } ifelse
  } forall pop
} bind def
/.substitutefamilies mark
  /AvantGarde
    {/AvantGarde-Book /AvantGarde-BookOblique
     /AvantGarde-Demi /AvantGarde-DemiOblique}
  /Bookman
    {/Bookman-Demi /Bookman-DemiItalic /Bookman-Light /Bookman-LightItalic}
  /Courier
    {/Courier /Courier-Oblique /Courier-Bold /Courier-BoldOblique}
  /Helvetica
    {/Helvetica /Helvetica-Oblique /Helvetica-Bold /Helvetica-BoldOblique
     /Helvetica-Narrow /Helvetica-Narrow-Oblique
     /Helvetica-Narrow-Bold /Helvetica-Narrow-BoldOblique}
  /NewCenturySchlbk
    {/NewCenturySchlbk-Roman /NewCenturySchlbk-Italic
     /NewCenturySchlbk-Bold /NewCenturySchlbk-BoldItalic}
  /Palatino
    {/Palatino-Roman /Palatino-Italic /Palatino-Bold /Palatino-BoldItalic}
  /Symbol
    {/Symbol /Symbol /Symbol /Symbol}
  /Times
    {/Times-Roman /Times-Italic /Times-Bold /Times-BoldItalic}
  /ZapfChancery-MediumItalic
    {/ZapfChancery-MediumItalic}
.dicttomark readonly def
/.nametostring {		% <name> .nametostring <string>
				% <other> .nametostring <other>
  dup type /nametype eq { .namestring } if
} bind def
/.fontnamestring {		% <fontname> .fontnamestring <string|name>
  dup type dup /nametype eq {
    pop .namestring
  } {
    /stringtype ne { pop () } if
  } ifelse
} bind def
/.substitutefontname {		% <fontname> <properties> .substitutefontname
				%   <altname|null>
	% Look for properties and/or a face name in the font name.
	% If we find any, use Times (serif) or Helvetica (sans) as the
	% base font; otherwise, use the default font.
	% Note that the "substituted" font name may be the same as
	% the requested one; the caller must check this.
  exch .fontnamestring {
    defaultfontname /Helvetica-Oblique /Helvetica-Bold /Helvetica-BoldOblique
    /Helvetica-Narrow /Helvetica-Narrow-Oblique
    /Helvetica-Narrow-Bold /Helvetica-Narrow-BoldOblique
    /Times-Roman /Times-Italic /Times-Bold /Times-BoldItalic
    /Helvetica-Narrow /Helvetica-Narrow-Oblique
    /Helvetica-Narrow-Bold /Helvetica-Narrow-BoldOblique
  } 3 1 roll
	% Stack: facelist properties fontname
	% Look for a face name.
  .substitutefaces {
    2 copy 0 get search {
      pop pop pop
	% Stack: facelist properties fontname [(pattern) family properties]
      dup 2 get 4 -1 roll or 3 1 roll
      1 get .substitutefamilies exch get
      4 -1 roll pop 3 1 roll
    } {
      pop pop
    } ifelse
  } forall pop
  1 index length mod get exec
} bind def
/.substitutefont {		% <fontname> .substitutefont <altname>
  dup 0 exch .fontnameproperties .substitutefontname
	% Only accept fonts known in the Fontmap.
   Fontmap 1 index known not { pop defaultfontname } if
} bind def

% If requested, make (and recognize) fake entries in FontDirectory for fonts
% present in Fontmap but not actually loaded.  Thanks to Ray Johnston for
% the idea behind this code.
FAKEFONTS not { (%END FAKEFONTS) .skipeof } if

% We use the presence or absence of the FontMatrix key to indicate whether
% a font is real or fake.  We must pop the arguments at the very end,
% so that stack protection will be effective.

/definefont {		% <name> <font> definefont <font>
  dup /FontMatrix known {
    //definefont
  } {
    2 copy /FontName get findfont //definefont exch pop exch pop
  } ifelse
} bind odef

/scalefont {		% <font> <scale> scalefont <font>
  1 index /FontMatrix known {
    //scalefont
  } {
    1 index /FontName get findfont 1 index //scalefont
    exch pop exch pop
  } ifelse
} bind odef

/makefont {		% <font> <matrix> makefont <font>
  1 index /FontMatrix known {
    //makefont
  } {
    1 index /FontName get findfont 1 index //makefont
    exch pop exch pop
  } ifelse
} bind odef

/setfont {		% <font> setfont -
  dup /FontMatrix known {
    //setfont
  } {
    dup /FontName get findfont //setfont pop
  } ifelse
} bind odef

%END FAKEFONTS

% Define findfont so it tries to load a font if it's not found.
% The Red Book requires that findfont be a procedure, not an operator,
% but it still needs to restore the stacks reliably if it fails,
% so we do all the work in an operator.
/.findfont {
  mark 1 index
  //systemdict begin .dofindfont
	% Define any needed aliases.
  counttomark 1 sub { .aliasfont } repeat end
  exch pop exch pop
} odef
/findfont {
  .findfont
} bind def
% Check whether the font name we are about to look for is already on the list
% of aliases we're accumulating; if so, cause an error.
/.checkalias		% -mark- <alias1> ... <name> .checkalias <<same>>
 { counttomark 1 sub -1 1
    { index 1 index eq
       { pop QUIET not
	  { (Unable to substitute for font.) = flush
	  } if
	 /findfont cvx /invalidfont signalerror
       }
      if
    }
   for
 } bind def
% Get a (non-fake) font if present in a FontDirectory.
/.fontknownget		% <fontdir> <fontname> .fontknownget <font> true
			% <fontdir> <fontname> .fontknownget false
 { .knownget
    { FAKEFONTS
       { dup /FontMatrix known { true } { pop false } ifelse }
       { true }
      ifelse
    }
    { false
    }
   ifelse
 } bind def
% This is the standard procedure for handling font substitution.
% Its location is per an Adobe newsgroup posting.
% It is called with the font name on the stack, standing in for findfont.
/.stdsubstfont {	% mark <alias1> ... <fontname> .stdsubstfont <font>
      /SUBSTFONT where {
	pop QUIET not {
	  (Substituting for font ) print dup =only
	  (.) = flush
	} if
			% No aliasing.
	cleartomark mark defaultfontname
      } {
	dup .substitutefont
	2 copy eq { pop defaultfontname } if
	.checkalias
	QUIET not {
	  SHORTERRORS {
	    (%%[) print 1 index =only
	    ( not found, substituting ) print dup =only (]%%)
	  } {
	    (Substituting font ) print dup =only
	    ( for ) print 1 index =only (.)
	  } ifelse = flush
	} if
			% Remove all the accumulated aliases.
	counttomark 1 add 1 roll cleartomark mark exch
      } ifelse
  .dofindfont
} bind def
$error /SubstituteFont { .stdsubstfont } put
% Scan the next directory on FONTPATH.
/.scannextfontdir {	% - .scannextfontdir <bool>
			% If we haven't scanned all the directories in
			% FONTPATH, scan the next one.
  null 0 1 FONTPATH length 1 sub {
    FONTPATH 1 index get null ne { exch pop exit } if pop
  } for dup null ne {
    dup 0 eq { .scanfontbegin } if
    FONTPATH 1 index get .scanfontdir
    FONTPATH exch null put true
  } {
    pop false
  } ifelse
} bind def
% Do the work of findfont, including substitution, defaulting, and
% scanning of FONTPATH.
/.dofindfont {		% <fontname> .dofindfont <font>
  .tryfindfont not {
			% We didn't find the font.  If we haven't scanned
			% all the directories in FONTPATH, scan the next one
			% now and look for the font again.
    .scannextfontdir {
			% Start over with an empty alias list.
      counttomark 1 sub { pop } repeat
      .dofindfont
    } {
			% No luck.  Make sure we're not already
			% looking for the default font.
      dup defaultfontname eq {
	QUIET not {
	  (Unable to load default font ) print
	  dup =only (!  Giving up.) = flush
	} if
	/findfont cvx /invalidfont signalerror
      } if
			% Substitute for the font.  Don't alias.
      $error /SubstituteFont get exec
    } ifelse
  } if
} bind def
% Try to find a font using only the present contents of Fontmap.
/.tryfindfont {		% <fontname> .tryfindfont <font> true
			% <fontname> .tryfindfont false
  .FontDirectory 1 index .fontknownget
    {			% Already loaded
      exch pop true
    }
    { dup Fontmap exch .knownget not
       {		% Unknown font name.  Look for a file with the
			% same name as the requested font.
	 .tryloadfont
       }
       {		% Try each element of the Fontmap in turn.
	 false exch	% (in case we exhaust the list)
			% Stack: fontname false fontmaplist
	 { exch pop
	   dup type /nametype eq
	    {			% Font alias
	      .checkalias .tryfindfont exit
	    }
	    { dup dup type dup /arraytype eq exch /packedarraytype eq or exch xcheck and
	       {		% Font with a procedural definition
		 exec		% The procedure will load the font.
				% Check to make sure this really happened.
		 .FontDirectory 1 index .knownget
		  { exch pop true exit }
		 if
	       }
	       {		% Font file name
		 .loadfontloop { true exit } if
	       }
	      ifelse
	    }
	   ifelse false
	 }
	 forall
			% Stack: font true -or- fontname false
	 { true
	 }
	 {			% None of the Fontmap entries worked.
				% Try loading a file with the same name
				% as the requested font.
	   .tryloadfont
	 }
	ifelse
       }
      ifelse
    }
   ifelse
 } bind def

% Attempt to load a font from a file.
/.tryloadfont {		% <fontname> .tryloadfont <font> true
			% <fontname> .tryloadfont false
  dup .nametostring
		% Hack: check for the presence of the resource machinery.
  /.genericrfn where {
    pop
    2 copy .fonttempstring /FontResourceDir getsystemparam .genericrfn
    .loadfontloop {
      exch pop exch pop true
    } {
      dup .nametostring .loadfontloop
    } ifelse
  } {
    .loadfontloop
  } ifelse
} bind def
/.loadfontloop {	% <fontname> <filename> .loadfontloop
			%   <font> true
			% -or-
			%   <fontname> false
			% See above regarding the use of 'loop'.
    { 			% Is the font name a string?
	dup type /stringtype ne
	 { QUIET not
	    { (Can't find font with non-string name: ) print dup =only (.) = flush
	    }
	   if pop false exit
	 }
	if
			% Can we open the file?
	findlibfile not
	 { QUIET not
	    { (Can't find \(or can't open\) font file ) print dup print
	      (.) = flush
	    }
	   if pop false exit
	 }
	if

			% Stack: fontname fontfilename fontfile
	DISKFONTS
	 { .currentglobal true .setglobal
	   2 index (r) file
	   FontFileDirectory exch 5 index exch .growput
	   .setglobal
	 }
	if
	QUIET not
	 { (Loading ) print 2 index =only
	   ( font from ) print 1 index print (... ) print flush
	 }
	if
	% If LOCALFONTS isn't set, load the font into local or global
	% VM according to FontType; if LOCALFONTS is set, load the font
	% into the current VM, which is what Adobe printers (but not
	% DPS or CPSI) do.
	LOCALFONTS { false } { /setglobal where } ifelse
	 { pop /FontType .findfontvalue { 1 eq } { false } ifelse
		% .setglobal, like setglobal, aliases FontDirectory to
		% GlobalFontDirectory if appropriate.  However, we mustn't
		% allow the current version of .setglobal to be bound in,
		% because it's different depending on language level.
	   .currentglobal exch /.setglobal .systemvar exec
		% Remove the fake definition, if any.
	   .FontDirectory 3 index .undef
	   1 index (r) file .loadfont .FontDirectory exch
	   /.setglobal .systemvar exec
	 }
	 { .loadfont .FontDirectory
	 }
	ifelse
		% Stack: fontname fontfilename fontdirectory
	QUIET not
	 { //systemdict /level2dict known
	    { .currentglobal false .setglobal vmstatus
	      true .setglobal vmstatus 3 -1 roll pop
	      6 -1 roll .setglobal 5
	    }
	    { vmstatus 3
	    }
	   ifelse { =only ( ) print } repeat
	   (done.) = flush
	 } if

		% Check to make sure the font was actually loaded.
	dup 3 index .fontknownget
	 { 4 1 roll pop pop pop true exit } if

		% Maybe the file had a different FontName.
		% See if we can get a FontName from the file, and if so,
		% whether a font by that name exists now.
	exch (r) file .findfontname
	 { 2 copy .fontknownget
	    {	% Yes.  Stack: origfontname fontdirectory filefontname fontdict
	      3 -1 roll pop exch
	      QUIET
	       { pop
	       }
	       { (Using ) print =only
	         ( font for ) print 1 index =only
	         (.) = flush
	       }
	      ifelse true exit
	    }
	   if pop
	 }
	if pop

		% The font definitely did not load correctly.
	QUIET not
	 { (Loading ) print dup =only
	   ( font failed.) = flush
	 } if
	false exit

    } loop		% end of loop

 } bind def

% Define a procedure to load all known fonts.
% This isn't likely to be very useful.
/loadallfonts
 { Fontmap { pop findfont pop } forall
 } bind def

% If requested, load all the fonts defined in the Fontmap into FontDirectory
% as "fake" fonts i.e., font dicts with only FontName and FontType defined.
% (We define FontType only for the sake of some questionable code in the
% Apple Printer Utility 2.0 font inquiry code.)
%
% Note that this procedure only creates fake fonts in the FontDirectory
% associated with the current VM.  This is because in multi-context systems,
% creating the fake fonts in local VM leads to undesirable complications.
/.definefakefonts
    {
    }
    {
      (gs_fonts FAKEFONTS) VMDEBUG
      Fontmap {
	pop dup type /stringtype eq { cvn } if
	.FontDirectory 1 index known not {
	  2 dict dup /FontName 3 index put
	  dup /FontType 1 put
	  .FontDirectory 3 1 roll put
	} {
	  pop
	} ifelse
      } forall
    }
FAKEFONTS { exch } if pop def	% don't bind, .current/setglobal get redefined

% Install initial fonts from Fontmap.
/.loadinitialfonts
 { NOFONTMAP not
    { /FONTMAP where
	  { pop [ FONTMAP .pathlist ]
	     { dup VMDEBUG findlibfile
		{ exch pop .loadFontmap }
		{ /undefinedfilename signalerror }
	       ifelse
	     }
	  }
	  { LIBPATH
	     { defaultfontmap 1 index .filenamedirseparator
	       exch concatstrings concatstrings dup VMDEBUG
	       (r) { file } .internalstopped
		{ pop pop } { .loadFontmap } ifelse
	     }
	  }
	 ifelse forall
    }
   if
   .definefakefonts	% current VM is global
 } def			% don't bind, .current/setglobal get redefined

% ---------------- Synthetic font support ---------------- %

% Create a new font by modifying an existing one.  paramdict contains
% entries with the same keys as the ones found in a Type 1 font;
% it should also contain enough empty entries to allow adding the
% corresponding non-overridden entries from the original font dictionary,
% including FID.  If paramdict includes a FontInfo entry, this will
% also override the original font's FontInfo, entry by entry;
% again, it must contain enough empty entries.

% Note that this procedure does not perform a definefont.

/.makemodifiedfont	% <fontdict> <paramdict> .makemodifiedfont <fontdict'>
 { exch
    {			% Stack: destdict key value
      1 index /FID ne
       { 2 index 2 index known
	  {		% Skip fontdict entry supplied in paramdict, but
			% handle FontInfo specially.
	    1 index /FontInfo eq
	     { 2 index 2 index get		% new FontInfo
	       1 index				% old FontInfo
		{	% Stack: destdict key value destinfo key value
		  2 index 2 index known
		   { pop pop }
		   { 2 index 3 1 roll put }
		  ifelse
		}
	       forall pop
	     }
	    if
	  }
	  {		% No override, copy the fontdict entry.
	    2 index 3 1 roll put
	    dup dup	% to match pop pop below
	  }
	 ifelse
       }
      if
      pop pop
    } forall
 } bind def

% Make a modified font and define it.  Note that unlike definefont,
% this does not leave the font on the operand stack.

/.definemodifiedfont	% <fontdict> <paramdict> .definemodifiedfont -
 { .makemodifiedfont
   dup /FontName get exch definefont pop
 } bind def