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gs_type1.ps

% Copyright (C) 2001-2019 Artifex Software, Inc.
% All Rights Reserved.
%
% This software is provided AS-IS with no warranty, either express or
% implied.
%
% This software is distributed under license and may not be copied,
% modified or distributed except as expressly authorized under the terms
% of the license contained in the file LICENSE in this distribution.
%
% Refer to licensing information at http://www.artifex.com or contact
% Artifex Software, Inc.,  1305 Grant Avenue - Suite 200, Novato,
% CA 94945, U.S.A., +1(415)492-9861, for further information.
%

% Type 1 font support code.

% The standard representation for PostScript compatible fonts is described
% in the book "Adobe Type 1 Font Format", published by Adobe Systems Inc.

/t1_glyph_equivalence mark   % Exported for pf2afm.ps
  /Odblacute /Ohungarumlaut
  /Udblacute /Uhungarumlaut
  /odblacute /ohungarumlaut
  /udblacute /uhungarumlaut
.dicttomark def

% Define an augmented version of .buildfont1 that inserts UnderlinePosition
% and UnderlineThickness entries in FontInfo if they aren't there already,
% and FontBBox isn't degenerate.
% (This works around the incorrect assumption, made by many word processors,
% that these entries are present in the built-in fonts.)
% Also add alternative names to some glyphs.
/.buildfont1
 {
   .currentglobal 3 1 roll
   dup .gcheck .setglobal
   dup .fontbbox {
     pop pop pop pop
     dup /FontInfo known not
      { //.growfontdict exec dup /FontInfo 2 dict put }
     if
     dup dup /FontInfo get dup dup
     /UnderlinePosition known exch /UnderlineThickness known and
      { pop pop		% entries already present
      }
      { dup length 2 add dict .copydict
        dup /UnderlinePosition known not
         { dup /UnderlinePosition 3 index /FontBBox get
           1 get 2 div put 			% 1/2 the font descent
         }
        if
        dup /UnderlineThickness known not
         { dup /UnderlineThickness 3 index /FontBBox get
           dup 3 get exch 1 get sub 20 div put 	% 1/20 the font height
         }
        if
        1 index /FontInfo get wcheck not { readonly } if
        /FontInfo exch put
      }
     ifelse
   } if

% We want to skip this process if we've already done it, and
 % not do it for embedded fonts.
 dup /.AGLprocessed~GS known not 1 index /PathLoad known and
 {
 dup /CharStrings get
 % Provide all known aliases for each glyph if
 % substitution is allowed (pf2afm.ps has code
 % to disables it by modifying t1_glyph_equivalence).
 t1_glyph_equivalence length 0 ne
 {
 % 16 byte scratch string
 % 16 bytes is arbitrary, but should be large enough to hold any "uniXXXX" style name
 //ReverseAdobeGlyphList //AdobeGlyphList 3 -1 roll
 % scratch(string) RAGL(dict) AGL(dict) CharStrings(dict)
 dup
 { % scratch(string) RAGL(dict) AGL(dict) CharStrings(dict) gname cstring
 exch dup % scratch(string) RAGL(dict) AGL(dict) CharStrings(dict) cstring gname gname
 4 index exch .knownget
 { //true}
 { % scratch(string) RAGL(dict) AGL(dict) CharStrings(dict) cstring gname
 dup length 16 gt
 { //false }
 {
 % if we couldn't derive the code point from the AGL, we might derive it
 % from a formatted "uniXXXX" name.
 dup <00000000000000000000000000000000> cvs dup flush (uni) anchorsearch
 {
 % as luck would have it, we can just replace the "uni" with "16#"
 % to get something we can convert to a number
 pop pop dup 0 (16#) putinterval {cvi} //.internalstopped exec
 { pop //false}
 { % scratch(string) RAGL(dict) AGL(dict) CharStrings(dict) cstring gname cpoint
 dup 5 index exch known
 { //true }
 { pop //false }
 ifelse
 } ifelse
 }
 { pop pop //false}
 ifelse
 } ifelse
 } ifelse

{
                                                             % scratch(string) RAGL(dict) AGL(dict) CharStrings(dict) cstring gname cpoint
             % loop through the array of names for this codepoint
             % if the CharStrings dict doesn't contain an entry for the name
             % create one.
             5 index exch .knownget
             {                                                   % scratch(string) RAGL(dict) AGL(dict) CharStrings(dict) cstring gname aglnames(array)
               {                                                 % scratch(string) RAGL(dict) AGL(dict) CharStrings(dict) cstring gname aglname
                 dup 4 index exch known not
                 {                                               % scratch(string) RAGL(dict) AGL(dict) CharStrings(dict) cstring gname aglname
                   CFFDEBUG { (\nsetting alias: ) print dup ==only
                         ( to be the same as glyph: ) print 1 index //== exec } if
                   3 index exch 3 index .forceput
                                                                 % scratch(string) RAGL(dict) AGL(dict) CharStrings(dict) cstring gname
                 }executeonly
                 {pop} ifelse
               } executeonly forall
               pop pop
             } executeonly
             {
               pop pop pop
             } ifelse
           } executeonly
           {
                                                               % scratch(string) RAGL(dict) AGL(dict) CharStrings(dict) cstring gname
             pop pop
           } ifelse
         } executeonly forall
         3 1 roll pop pop
     } executeonly if
     pop
     dup /.AGLprocessed~GS //true .forceput
   } executeonly if

%% We need to excute the C .buildfont1 in a stopped context so that, if there
   %% are errors we can put the stack back sanely and exit. Otherwise callers won't
   %% be able to execute this redefinied .buildfont1 in a stopped context and still
   %% usefully continue (because the stack will be altered, which it shold not be).
   %%
   %% Uncovered working on bug #696306 and fixed as part of that bug.
   %%
   {//.buildfont1} stopped
   4 3 roll .setglobal
   {//.buildfont1 $error /errorname get signalerror} if
 } .bind executeonly def	% hide .forceput

% container for CloseSource flag (default //true to prevent buildup of file handles)
 /closesourcedict mark
 /CloseSource //true
 .dicttomark readonly def
/.loadfont1 {		% <file> .loadfont1 <errorflag>
 {	% We would like to use `false /PFBDecode filter',
 % but this occasionally produces a whitespace character as
 % the first of an eexec section, so we can't do it.
 % Also, since the real input file never reaches EOF if we are using
 % a PFBDecode filter (the filter stops just after reading the last
 % character), we must explicitly close the real file in this case.
 % Since the file might leave garbage on the operand stack,
 % we have to create a procedure to close the file reliably.
 dup read not { -1 } if
 2 copy .unread 16#80 eq {
 dup //closesourcedict //true /PFBDecode filter cvx
 exch .currentresourcefile eq {
 dup /.execasresource .systemvar
 } {
 {exec}
 } ifelse
 2 index cvlit
 /closefile .systemvar 3 .execn
 } {
 cvx exec
 } ifelse
 } stopped
} bind executeonly def

% If the diskfont feature isn't included, define a dummy .loadfontdict.
/.loadfontdict where
 { pop }
 { /.loadfontdict 0 dict readonly def }
ifelse
/.loadfontfile		% <file> .loadfontfile -
 { mark exch

% In order to load fonts reliably, we should push systemdict
        % here.  However, Ed Taft says that Adobe implementations
        % push userdict and nothing else!
        % We really would just like systemdict on the stack,
        % but fonts produced by Fontographer require a writable dictionary.
        % However, we can't use any of the other well-known dictionaries
        % (such as userdict), since the whole point of pushing systemdict
        % is to make sure that nothing important has been redefined.
   32 dict begin
        % We can't just use `run', because we want to check for .PFB files.
   currentpacking
    { //false setpacking //.loadfont1 exec //true setpacking }
    { //.loadfont1 exec }
   ifelse
    end
    { stop } if
   cleartomark
 } bind def
% undefine stuff that is only used internally, and is immediately bound
currentdict /closesourcedict .undef
currentdict /.loadfont1 .undef

% Note: this procedure is used for both Type 1 and Type 2 fonts.
/.type1build {		% <code|name> <name> .type1build
 % <code|name> <name> <charstring>
 2 index begin
 dup CharStrings exch .knownget not {
 2 copy eq { exch pop /.notdef exch } if
 QUIET not
 { (Substituting .notdef for ) print
 =string cvs print ( in the font ) print
 1 index /FontName get = flush
 }
 { pop }
 ifelse
 /.notdef CharStrings /.notdef get
 } if
 end
} bind def

% Here are the BuildChar and BuildGlyph implementation for Type 1 fonts.
% The names %Type1BuildChar and %Type1BuildGlyph are known to the interpreter.
% The real work is done in an operator:
%	 <code|name> <name> <charstring> .type1execchar -

(%Type1BuildChar) cvn {	% <code> %Type1BuildChar -
 1 index /Encoding get 1 index get //.type1build exec .type1execchar
} bind executeonly def
(%Type1BuildGlyph) cvn {	% <name> %Type1BuildGlyph -
 dup //.type1build exec .type1execchar
} bind executeonly def

1183615869 internaldict begin
% CCRun is an undocumented procedure provided for Type 4 and Type 0 fonts.
% Apparently there are two different argument lists for CCRun.
% Handling the one with the extra Private dictionary requires fabricating
% a Type 1 font on the fly, since we aren't currently prepared to parse the
% dictionary any other way.
/CCRun {	% <code|name> <charstring> CCRun -
 % <code|name> <charstring> <Private> CCRun -
 dup type /dicttype eq {
 dup 4 index /Private .knownget { ne } { pop //true } ifelse {
 % The Private dictionary was supplied, and is different
 % from the Private dictionary of the font. Fabricate a
 % Type 1 font with this Private dictionary. Most of the
 % font entries are arbitrary or not needed.
 .currentglobal //false .setglobal 10 dict exch .setglobal begin
 /Private exch def
 /FontType 1 def
 /FontMatrix 3 index /FontMatrix get def
 /Encoding 3 index /Encoding .knownget not { StandardEncoding } if def
 /FontBBox 3 index /FontBBox .knownget not { {0 0 0 0} } if def
 /PaintType 0 def
 /CharStrings 1 dict dup /.notdef () put def
 3 -1 roll pop () currentdict end .buildfont1 exch pop 3 1 roll
 } {
 pop
 } ifelse
 } if
 1 index dup type /integertype eq {
 3 index /Encoding get exch get
 } if exch .type1execchar
} bind def

% setweightvector is an undocumented procedure that force writes
% weight vector to the font. Do extra checks for safety.
/setweightvector { % <vector> setweightvector -
 dup type dup /arraytype ne exch /packedarraytype ne and
 2 index type /dicttype ne or {
 /setweightvector cvx /typecheck signalerror
 } if
 1 index /FontType known not {
 /setweightvector cvx /invalidfont signalerror
 } if
 dup gcheck 2 index gcheck not and {
 /setweightvector cvx /invalidaccess signalerror
 } if
 2 copy /WeightVector exch .forceput
 .setweightvector
} .bind executeonly odef
end

% Register the font types for definefont.
buildfontdict 1 /.buildfont1 cvx put
buildfontdict 4 /.buildfont4 cvx put

% Add Type 2 support if applicable.
/.buildfont2 where not { (%END2) .skipeof } if
pop
(%Type2BuildChar) cvn {	% <code> %Type2BuildChar -
 1 index /Encoding get 1 index get //.type1build exec .type2execchar
} bind executeonly def
(%Type2BuildGlyph) cvn {	% <name> %Type2BuildGlyph -
 dup //.type1build exec .type2execchar
} bind executeonly def
buildfontdict 2 /.buildfont2 cvx put
%END2

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