harvey/sys/src/cmd/gs/lib/gs_type1.ps

%    Copyright (C) 1994, 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_type1.ps,v 1.5 2001/08/06 16:47:43 igorm Exp $
% 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.

% 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.)
/.buildfont1
 {
   false 1 index /FontBBox .knownget {
     { 0 ne { not exit } if } forall
   } if
   { dup /FontInfo known not
      { .growfontdict 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 .knownget
            { 1 get 2 div }			% 1/2 the font descent
	    { -100 } ifelse put
         }
        if
        dup /UnderlineThickness known not
         { dup /UnderlineThickness 3 index /FontBBox .knownget
            { dup 3 get exch 1 get sub 20 div }	% 1/20 the font height
    	    { 50 } ifelse put
         }
        if
        1 index /FontInfo get wcheck not { readonly } if
        /FontInfo exch put
      }
     ifelse
   } if
   //.buildfont1
 } bind 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
   DISKFONTS { .loadfontdict begin } if
	% 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.
   userdict begin
	% We can't just use `run', because we want to check for .PFB files.
   currentpacking
    { false setpacking .loadfont1 true setpacking }
    { .loadfont1 }
   ifelse end
    { stop } if
   DISKFONTS { end } if
   cleartomark
 } bind 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 true /PFBDecode filter cvx
	exch .currentresourcefile eq {
	  dup /.execasresource .systemvar
	} {
	  {exec}
	} ifelse
	2 index cvlit
	/closefile .systemvar 3 .execn
      } {
	cvx exec
    } ifelse
  } stopped
} 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:
%	<font> <code|name> <name> <charstring> .type1execchar -

(%Type1BuildChar)  cvn {	% <font> <code> %Type1BuildChar -
  1 index /Encoding get 1 index get .type1build .type1execchar
} bind def
(%Type1BuildGlyph) cvn {	% <font> <name> %Type1BuildGlyph -
  dup .type1build .type1execchar
} bind def
% Note: this procedure is used for both Type 1 and Type 2 fonts.
/.type1build {		% <font> <code|name> <name> .type1build
			%   <font> <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 = flush }
	{ pop }
       ifelse
       /.notdef CharStrings /.notdef get
    } if
  end
} bind def
% CCRun is an undocumented procedure provided for Type 4 and Type 0 fonts.
1183615869 internaldict begin
% 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 {	% <font> <code|name> <charstring> CCRun -
		% <font> <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
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 {	% <font> <code> %Type2BuildChar -
  1 index /Encoding get 1 index get .type1build .type2execchar
} bind def
(%Type2BuildGlyph) cvn {	% <font> <name> %Type2BuildGlyph -
  dup .type1build .type2execchar
} bind def
buildfontdict 2 /.buildfont2 cvx put
%END2