harvey/sys/src/cmd/gs/lib/font2pcl.ps

%    Copyright (C) 1993, 1994, 1995, 1997 Aladdin Enterprises.  All rights reserved.
% 
% This file is part of AFPL Ghostscript.
% 
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% 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: font2pcl.ps,v 1.2 2000/09/19 18:29:11 lpd Exp $
% font2pcl.ps
% Write out a font as a PCL bitmap font.

/pcldict 60 dict def

% Write out the current font as a PCL bitmap font.
% The current transformation matrix defines the font size and orientation.

/WriteResolution? false def	% true=use "resolution bound font" format,
				% false=use older format

/LJ4 false def			% true=use LJ4 Typeface code
				% false=use LJIIP/IID/IIIx Typeface code

pcldict begin		% internal procedures

/findstring	% <string> <substring> findstring <bool>
 { search { pop pop pop true } { pop false } ifelse
 } def

	% Determine which set of keywords is present in a string.
	% The last keyword set must be empty.

/keysearch	% <string> <array of arrays of keywords> keysearch <index>
 { 0 1 2 index length 1 sub
    { 2 copy get true exch
       {	% Stack: <string> <a.a.k.> <index> <bool> <keyword>
         4 index exch findstring and
       }
      forall
       { 0 exch getinterval exit
       }
      if pop
    }
   for
   exch pop length	% invalid index if missing
 } def

	% Determine the device height of a string in quarter-dots.

/charheight		% <string> charheight <int>
 { gsave newpath 0 0 moveto false charpath
   pathbbox exch pop exch sub exch pop 0 exch grestore
   dtransform add abs 4 mul cvi
 } def

	% Compute an integer version of the transformed FontBBox.

/inflate		% <num> inflate <num>
 { dup 0 gt { ceiling } { floor } ifelse
 } def
/ixbbox			% - ixbbox <llx> <lly> <urx> <ury>
 { /FontBBox load aload pop		% might be executable or literal
   4 2 roll transform exch truncate cvi exch truncate cvi
   4 2 roll transform exch inflate cvi exch inflate cvi
 } def

	% Determine the original font of a possibly transformed font.
	% Since some badly behaved PostScript files construct transformed
	% fonts "by hand", we can't just rely on the OrigFont pointers.
	% Instead, if a font with the given name exists, and if its
	% entries for FontType and UniqueID match those of the font we
	% obtain by following the OrigFont chain, we use that font.

/origfont
 {  { dup /OrigFont known not { exit } if /OrigFont get } loop
   FontDirectory 1 index /FontName get .knownget
    {		% Stack: origfont namedfont
      1 index /FontType get 1 index /FontType get eq
       { 1 index /UniqueID .knownget
	  { 1 index /UniqueID .knownget
	     { eq { exch } if }
	     { pop }
            ifelse
	  }
	 if
       }
      if pop
    }
   if
 } def


	% Determine the bounding box of the current device's image.
	% Free variables: row, zerow.

/devbbox		% <rw> <rh> devbbox <ymin> <ymax1> <xmin> <xmax1>
 {		% Find top and bottom whitespace.
   dup
    { dup 0 eq { exit } if 1 sub
      dup currentdevice exch row copyscanlines
      zerow ne { 1 add exit } if
    }
   loop		% ymax1
   0
    { 2 copy eq { exit } if
      dup currentdevice exch row copyscanlines
      zerow ne { exit } if
      1 add
    }
   loop		% ymin
   exch
		% Find left and right whitespace.
   3 index 0
		% Stack: rw rh ymin ymax1 xmin xmax1
   3 index 1 4 index 1 sub
    { currentdevice exch row copyscanlines .findzeros
      exch 4 1 roll max 3 1 roll min exch
    }
   for		% xmin xmax1
		% Special check: xmin > xmax1 if height = 0
   2 copy gt { exch pop dup } if
   6 -2 roll pop pop

 } def

	% Write values on outfile.

 /w1 { 255 and outfile exch write } def
 /w2 { dup -8 bitshift w1 w1 } def
 /wbyte			% <byte> <label> wbyte
  { VDEBUG { print ( =byte= ) print dup == flush } { pop } ifelse w1
  } def
 /wword			% <word16> <label> wword
  { VDEBUG { print ( =word= ) print dup == flush } { pop } ifelse w2
  } def
 /wdword		% <word32> <label> wdword
  { VDEBUG { print ( =dword= ) print dup == flush } { pop } ifelse
    dup -16 bitshift w2 w2
  } def

/style.posture.keys
 [ { (Italic) } { (Oblique) }
   { }
 ] def
/style.posture.values <010100> def

/style.appearance.width.keys
 [ { (Ultra) (Compressed) }
   { (Extra) (Compressed) }
   { (Extra) (Condensed) }
   { (Extra) (Extended) }
   { (Extra) (Expanded) }
   { (Compressed) }
   { (Condensed) }
   { (Extended) }
   { (Expanded) }
   { }
 ] def
/style.appearance.width.values <04030207070201060600> def

/width.type.keys
 [ { (Ultra) (Compressed) }
   { (Extra) (Compressed) }
   { (Extra) (Condensed) }
   { (Extra) (Expanded) }
   { (Compressed) }
   { (Condensed) }
   { (Expanded) }
   { }
 ] def
/width.type.values <fbfcfd03fdfe0200> def

/stroke.weight.keys
 [ { (Ultra) (Thin) }
   { (Ultra) (Black) }
   { (Extra) (Thin) }
   { (Extra) (Light) }
   { (Extra) (Bold) }
   { (Extra) (Black) }
   { (Demi) (Light) }
   { (Demi) (Bold) }
   { (Semi) (Light) }
   { (Semi) (Bold) }
   { (Thin) }
   { (Light) }
   { (Bold) }
   { (Black) }
   { }
 ] def
/stroke.weight.values <f907fafc0406fe02ff01fbfd030500> def

/vendor.keys
 [ { (Agfa) }
   { (Bitstream) }
   { (Linotype) }
   { (Monotype) }
   { (Adobe) }
   { }
 ] def
/vendor.default.index 4 def		% might as well be Adobe
/old.vendor.values <020406080a00> def
/new.vendor.values <010203040500> def
/vendor.initials (CBLMA\000) def

currentdict readonly end pop		% pcldict


% Convert and write a PCL font for the current font and transformation.

% Write the font header.  We split this off only to avoid overflowing
% the limit on the maximum size of a procedure.
% Free variables: outfile uury u0y rw rh orientation uh ully
/writefontheader
 { outfile (\033\)s) writestring
   outfile 64 WriteResolution? { 4 add } if
     Copyright length add write==only
   outfile (W) writestring
   WriteResolution? { 20 68 } { 0 64 } ifelse
     (Font Descriptor Size) wword
     (Header Format) wbyte
   1 (Font Type) wbyte
   FullName style.posture.keys keysearch style.posture.values exch get
   FullName style.appearance.width.keys keysearch
     style.appearance.width.values exch get 4 mul add
   PaintType 2 eq { 32 add } if
     /style exch def
   style -8 bitshift (Style MSB) wbyte
   0 (Reserved) wbyte
   /baseline uury 1 sub u0y sub def
     baseline (Baseline Position) wword
   rw (Cell Width) wword
   rh (Cell Height) wword
   orientation (Orientation) wbyte
   FontInfo /isFixedPitch .knownget not { false } if
    { 0 } { 1 } ifelse (Spacing) wbyte
	% Use loop/exit to fake a multiple-exit block.
    { Encoding StandardEncoding eq { 10 (J) exit } if
      Encoding ISOLatin1Encoding eq { 11 (J) exit } if
      Encoding SymbolEncoding eq { 19 (M) exit } if
      Encoding DingbatsEncoding eq { 10 (L) exit } if
%      (Warning: unknown Encoding, using ISOLatin1.\n) print flush
      11 (J) exit
    }
   loop
   0 get 64 sub exch 32 mul add (Symbol Set) wword
   ( ) stringwidth pop 0 dtransform add abs 4 mul
     /pitch exch def
   pitch cvi (Pitch) wword
   uh 4 mul (Height) wword			% Height
   (x) charheight (x-Height) wword
   FullName width.type.keys keysearch
     width.type.values exch get (Width Type) wbyte
   style 255 and (Style LSB) wbyte
   FullName stroke.weight.keys keysearch
     stroke.weight.values exch get (Stroke Weight) wbyte
   FullName vendor.keys keysearch
     dup vendor.initials exch get 0 eq
      {		% No vendor in FullName, try Notice
        pop Copyright vendor.keys keysearch
	dup vendor.initials exch get 0 eq { pop vendor.default.index } if
      }
     if
     /vendor.index exch def
   0 (Typeface LSB) wbyte		% punt
   0 (Typeface MSB) wbyte		% punt
   0 (Serif Style) wbyte		% punt
   2 (Quality) wbyte
   0 (Placement) wbyte
   gsave FontMatrix concat rot neg rotate
   /ulwidth
     FontInfo /UnderlineThickness .knownget
      { 0 exch dtransform exch pop abs }
      { resolution 100 div }
     ifelse def
   FontInfo /UnderlinePosition .knownget
    { 0 exch transform exch pop negY ulwidth 2 div add }
    { ully ulwidth add }
   ifelse u0y sub
   round cvi 1 max 255 min (Underline Position) wbyte
   ulwidth round cvi 1 max 255 min (Underline Thickness) wbyte
   grestore
   uh 1.2 mul 4 mul cvi (Text Height) wword
   (average lowercase character) dup stringwidth
     pop 0 dtransform add abs
     exch length div 4 mul cvi (Text Width) wword
   0
    { dup Encoding exch get /.notdef ne { exit } if
      1 add
    }
   loop (First Code) wword
   255
    { dup Encoding exch get /.notdef ne { exit } if
      1 sub
    }
   loop (Last Code) wword
   pitch dup cvi sub 256 mul cvi (Pitch Extended) wbyte
   0 (Height Extended) wbyte
   0 (Cap Height) wword			% (default)
   currentfont /UniqueID known { UniqueID } { 0 } ifelse
     16#c1000000 add (Font Number (Adobe UniqueID)) wdword
   FontName length 16 max string
     dup FontName exch cvs pop
     outfile exch 0 16 getinterval writestring	% Font Name
   WriteResolution?
    { resolution dup (X Resolution) wword (Y Resolution) wword
    }
   if
   outfile Copyright writestring	% Copyright
 } def

/writePCL		% <fontfile> <resolution> writePCL -
 {
   save
   currentfont begin
   pcldict begin
   80 dict begin		% allow for recursion
     /saved exch def
     /resolution exch def
     /outfile exch def
   matrix currentmatrix dup 4 0 put dup 5 0 put setmatrix

	% Supply some default values so we don't have to check later.

   currentfont /FontInfo known not { /FontInfo 1 dict def } if
   currentfont /FontName known not { /FontName () def } if
   /Copyright   FontInfo /Notice .knownget not { () } if   def
   /FullName
     FontInfo /FullName .knownget not
      { FontName dup length string cvs }
     if def

	% Determine the original font, and its relationship to this one.

   /OrigFont currentfont origfont def
   /OrigMatrix OrigFont /FontMatrix get def
   /OrigMatrixInverse OrigMatrix matrix invertmatrix def
   /ScaleMatrix matrix currentfont OrigFont ne
    { FontMatrix exch OrigMatrixInverse exch concatmatrix
    } if
   def
   /CurrentScaleMatrix
     matrix currentmatrix
     matrix defaultmatrix
     dup 0 get 1 index 3 get mul 0 lt
     1 index dup 1 get exch 2 get mul 0 gt or
       /flipY exch def
     dup invertmatrix
     dup concatmatrix
   def
   /negY flipY { {neg} } { {} } ifelse def

	% Print debugging information.

   /CDEBUG where { pop } { /CDEBUG false def } ifelse
   /VDEBUG where { pop } { /VDEBUG false def } ifelse
   CDEBUG { /VDEBUG true def } if
   DEBUG
    { (currentmatrix: ) print matrix currentmatrix ==
      (defaultmatrix: ) print matrix defaultmatrix ==
      (flipY: ) print flipY ==
      (scaling matrix: ) print CurrentScaleMatrix ==
      (FontMatrix: ) print FontMatrix ==
      (FontBBox: ) print /FontBBox load ==
      currentfont OrigFont ne
       { OrigFont /FontName .knownget { (orig FontName: ) print == } if
         (orig FontMatrix: ) print OrigMatrix ==
       } if
      currentfont /ScaleMatrix .knownget { (ScaleMatrix: ) print == } if
      gsave
	FontMatrix concat
	(combined matrix: ) print matrix currentmatrix ==
      grestore
      flush
    } if

	% Determine the orientation.

   ScaleMatrix matrix currentmatrix dup concatmatrix
   0 1 3
    { 1 index 1 get 0 eq 2 index 2 get 0 eq and 2 index 0 get 0 gt and
       { exit } if
      pop -90 matrix rotate exch dup concatmatrix
    }
   for
   dup type /integertype ne
    { (Only rotations by multiples of 90 degrees are supported:\n) print
      == flush
      saved end end end restore stop
    }
   if
   /orientation exch def
   /rot orientation 90 mul def
   DEBUG { (orientation: ) print orientation == flush } if

   dup dup 0 get exch 3 get negY sub abs 0.5 ge
    { (Only identical scaling in X and Y is supported:\n) print
      exch flipY 3 array astore ==
      currentdevice .devicename ==
      matrix defaultmatrix == flush
      saved end end end restore stop
    }
   if pop

	% Determine the font metrics, in the PCL character coordinate system,
	% which has +Y going towards the top of the page.

   gsave
   FontMatrix concat
     0 0 transform
     negY round cvi /r0y exch def
     round cvi /r0x exch def
   ixbbox
     negY /rury exch def  /rurx exch def
     negY /rlly exch def  /rllx exch def
     /rminx rllx rurx min def
     /rminy rlly negY rury negY min def
     /rw rurx rllx sub abs def
     /rh rury rlly sub abs def
   gsave rot neg rotate
     0 0 transform
     negY round cvi /u0y exch def
     round cvi /u0x exch def
   ixbbox
     negY /uury exch def   /uurx exch def
     negY /ully exch def   /ullx exch def
     /uw uurx ullx sub def
     /uh uury ully sub def
   grestore
   DEBUG 
    { (rmatrix: ) print matrix currentmatrix ==
      (rFontBBox: ) print [rllx rlly rurx rury] ==
      (uFontBBox: ) print [ullx ully uurx uury] ==
      flush
    } if
   grestore

	% Disable the character cache, to avoid excessive allocation
	% and memory sandbars.

   mark cachestatus   /upper exch def
   cleartomark 0 setcachelimit
   
	% Write the font header.

   writefontheader

	% Establish an image device for rasterizing characters.

   matrix currentmatrix
     dup 4 rminx neg put
     dup 5 rminy neg put
	% Round the width up to a multiple of 8
	% so we don't get garbage bits in the last byte of each row.
   rw 7 add -8 and rh <ff 00> makeimagedevice
     /cdevice exch def
   nulldevice			% prevent page device switching
   cdevice setdevice

	% Rasterize each character in turn.

   /raster   rw 7 add 8 idiv   def
   /row   raster string   def
   /zerow   row length string   def
   0 1 Encoding length 1 sub
    { /cindex exch def
      Encoding cindex get /.notdef ne
       { VDEBUG { Encoding cindex get == flush } if
         erasepage initgraphics
	 0 0 moveto currentpoint transform add
	 ( ) dup 0 cindex put show
	 currentpoint transform add exch sub round cvi
	   /cwidth exch abs def
	 rw rh devbbox
	 VDEBUG
	  { (image bbox: ) print 4 copy 4 2 roll 4 array astore == flush
	  } if
		% Save the device bounding box.
		% Note that this is in current device coordinates,
		% not PCL (right-handed) coordinates.
	 /bqx exch def  /bpx exch def  /bqy exch def  /bpy exch def
		% Re-render with the character justified to (0,0).
		% This may be either the lower left or the upper left corner.
	 bpx neg bpy neg idtransform moveto
	 erasepage
	 VDEBUG { (show point: ) print [ currentpoint transform ] == flush } if
	 ( ) dup 0 cindex put show
		% Find the bounding box.  Note that xmin and ymin are now 0,
		% xmax1 = xw, and ymax1 = yh.
	 rw rh devbbox
	   /xw exch def
		% xmin or ymin can be non-zero only if the character is blank.
	   xw 0 eq
	    { pop }
	    { dup 0 ne { (Non-zero xmin! ) print = } { pop } ifelse }
	   ifelse
	   /yh exch def
	   yh 0 eq
	    { pop }
	    { dup 0 ne { (Non-zero ymin! ) print = } { pop } ifelse }
	   ifelse

	 /xbw xw 7 add 8 idiv def
	 /xright raster 8 mul xw sub def
		% Write the Character Code command.
	 outfile (\033*c) writestring
	 outfile cindex write==only
	 outfile (E) writestring
	 	% Write the Character Definition command.
	 outfile (\033\(s) writestring
	 yh xbw mul 16 add
	 outfile exch write=only
		% Record the character position for the .PCM file.
	 /cfpos outfile fileposition 1 add def
	 outfile (W\004\000\016\001) writestring
	 orientation (Orientation) wbyte 0 (Reserved) wbyte
	 rminx bpx add r0x sub (Left Offset) wword
	 flipY { rminy bpy add neg } { rminy bqy add } ifelse r0y sub
	   (Top Offset) wword
	 xw (Character Width) wword
	 yh (Character Height) wword
	 cwidth orientation 2 ge { neg } if 4 mul (Delta X) wword
		% Write the character data.
	 flipY { 0 1 yh 1 sub } { yh 1 sub -1 0 } ifelse
	  { cdevice exch row copyscanlines
	    0 xbw getinterval
	    CDEBUG
	     { dup
	        { 8
		   { dup 128 ge { (+) } { (.) } ifelse print
		     127 and 1 bitshift
		   }
		  repeat pop
	        }
	       forall (\n) print
	     }
	    if
	    outfile exch writestring
	  }
	 for
       }
       { /bpx 0 def   /bpy 0 def   /bqx 0 def   /bqy 0 def
	 /cwidth 0 def
	 /cfpos 0 def
       }
      ifelse

    }
   for

	% Wrap up.

   upper setcachelimit
   outfile closefile

   nulldevice			% prevent page device switching
   saved end end end restore

 } def

% Provide definitions for testing with older or non-custom interpreters.

/.findzeros where { pop (%END) .skipeof } if
/.findzeros
 { userdict begin   /zs exch def   /zl zs length def
   0 { dup zl ge { exit } if dup zs exch get 0 ne { exit } if 1 add } loop
   zl { dup 0 eq { exit } if dup 1 sub zs exch get 0 ne { exit } if 1 sub } loop
   exch 3 bitshift exch 3 bitshift
   2 copy lt
    { exch zs 1 index -3 bitshift get
       { dup 16#80 and 0 ne { exit } if exch 1 add exch 1 bitshift } loop pop
      exch zs 1 index -3 bitshift 1 sub get
       { dup 1 and 0 ne { exit } if exch 1 sub exch -1 bitshift } loop pop
    }
   if end
 } bind def
%END

/write=only where { pop (%END) .skipeof } if
/w=s 128 string def
/write=only
 { w=s cvs writestring
 } bind def
%END

%**************** Test
/PCLTEST where {
  pop
  /DEBUG true def
  /CDEBUG true def
  /VDEBUG true def
  /Times-Roman findfont 10 scalefont setfont
  (t.pcf) (w) file
  300 72 div dup scale
  300 writePCL
  flush quit
} if