harvey/sys/lib/ghostscript/pdf_ops.ps

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% $Id: pdf_ops.ps,v 1.17.2.1 2001/12/22 07:34:23 masata-y Exp $
% Definitions for most of the PDF operators.

.currentglobal true .setglobal

% Define pdfmark.  Don't allow it to be bound in.
% Also don't define it in systemdict, because this leads some Adobe code
% to think this interpreter is a distiller.
% (If this interpreter really is a distiller, don't do this.)
systemdict /pdfmark known not
 { userdict /pdfmark { cleartomark } bind put } if

userdict /GS_PDF_ProcSet 127 dict dup begin

% ---------------- Abbreviations ---------------- %

/bdef { bind def } bind def

% ---------------- Graphics state stack ---------------- %

% PDF adds a number of parameters to the graphics state.
% We implement this by pushing and popping a dictionary
% each time we do a PDF gsave or grestore.
% The keys in this dictionary are as follows:
%	self			% identifies the dictionary as one of ours
%	ClipRect		% (optional)
%	Show
%	TextSaveMatrix		% matrix at time of BT (iff within BT/ET)
% (The following correspond directly to PDF state parameters.)
%	AlphaIsShape
%	FillConstantAlpha
%	FillColor
%	FillColorSpace
%	FillOverprint
%	SoftMask
%	StrokeConstantAlpha
%	StrokeColor
%	StrokeColorSpace
%	StrokeOverprint
%	TextSpacing
%	TextHScaling
%	Leading
%	TextFont
%	TextLineMatrix
%	TextMatrix
%	TextRise
%	TextRenderingMode
%	WordSpacing

/nodict 1 dict def
nodict /self { //nodict } executeonly put
nodict readonly pop

/dictbeginpage {	% <initialdict> dictbeginpage -
  //nodict 20 dict .copydict begin { def } forall
  graphicsbeginpage textbeginpage
} bdef
/endpage {	% - endpage -
  showpage end
} bdef

/graphicsbeginpage {
  initgraphics
  currentdict /ClipRect .knownget { aload pop rectclip } if
  0 g  0 G  false op  false OP  0 OPM
  1 ca  1 CA  null SMask  false AIS  /Compatible BM  true TK
} bdef

/gput		% <value> <key> gput -
 { exch currentdict //nodict eq { /self dup load end 5 dict begin def } if
		% If we're in a Level 1 system, we need to grow the
		% dictionary explicitly.
   currentdict length currentdict maxlength ge %eq
    { currentdict dup length 3 mul 2 idiv 1 add dict .copydict end begin 
    }
   if def
 } bdef

/q {
  gsave //nodict begin
} bdef
% Some PDF files have excess Q operators!
/Q {
  currentdict /self .knownget { exec //nodict eq { end grestore } if } if
} bdef

% ---------------- Color setting ---------------- %

/fcput		% <color> <colorspace> fcput -
 { /FillColorSpace gput /FillColor gput
 } bdef
/scput		% <color> <colorspace> scput -
 { /StrokeColorSpace gput /StrokeColor gput
 } bdef

/csdevgray [/DeviceGray] readonly def
/csdevrgb [/DeviceRGB] readonly def
/csdevcmyk [/DeviceCMYK] readonly def
/cspattern [/Pattern] readonly def
/nullpattern1 mark
   /PatternType 1 /PaintType 1 /TilingType 3 /BBox [0 0 0 0]
   /XStep 1 /YStep 1 /PaintProc { }
.dicttomark readonly def
/nullpattern2 nullpattern1 dup length dict copy readonly def

% Each entry in the color space dictionary is a procedure of the form
%	<cspace> -proc- <cspace> <initial-color>
/CSdict mark
  /DeviceGray { pop //csdevgray 0 } bind
  /DeviceRGB { pop //csdevrgb [0 0 0] cvx } bind
  /DeviceCMYK { pop //csdevcmyk [0 0 0 1] cvx } bind
  /CIEBasedA { 0 } bind
  /CIEBasedABC { [0 0 0] cvx } bind
  /ICCBased { [ 1 index 1 oget /N get { 0 } repeat ] cvx } bind
  /Separation { 1 } bind
  /DeviceN {	% What is the correct value??
    [ 1 index 1 get length { 1 } repeat ] cvx
  } bind
  /Indexed { 0 } bind
  /Pattern {
    dup type /nametype eq 1 index length 1 eq or {
      pop //cspattern //nullpattern1 matrix makepattern
    } {
      //nullpattern2 matrix makepattern 1 index 1 get csset
		% Stack: patternspace nullpattern basecolor basespace
      pop [ 3 1 roll dup type /arraytype eq { aload pop } if
      counttomark -1 roll ] cvx
    } ifelse
  } bind
.dicttomark readonly def
/csset			% <cspace> csset <color> <cspace>
 { dup dup type /nametype ne { 0 get } if //CSdict exch get exec exch
 } bdef

/g { //csdevgray fcput } bdef
/G { //csdevgray scput } bdef
/rg { 3 array astore cvx //csdevrgb fcput } bdef
/RG { 3 array astore cvx //csdevrgb scput } bdef
/k { 4 array astore cvx //csdevcmyk fcput } bdef
/K { 4 array astore cvx //csdevcmyk scput } bdef
/cs { csset fcput } bdef
/CS { csset scput } bdef
/ri { pop } bdef
% We have to break up sc according to the number of operands.
/sc1 { /FillColor gput } bdef
/SC1 { /StrokeColor gput } bdef
% We have to avoid storing into a color array associated with an outer
% gsave level, so we do a kind of "copy on write".
/sc* {
  currentdict /FillColor .knownget {
    astore pop
  } {
    /FillColor load length array astore cvx /FillColor gput
  } ifelse
} bdef
/SC* {
  currentdict /StrokeColor .knownget {
    astore pop
  } {
    /StrokeColor load length array astore cvx /StrokeColor gput
  } ifelse
} bdef

% ---------------- Overprint/transparency setting ---------------- %

/op { /FillOverprint gput } bdef
/OP { /StrokeOverprint gput } bdef
/OPM {
  /.setoverprintmode where { pop .setoverprintmode } { pop } ifelse
} bdef
/ca { /FillConstantAlpha gput } bdef
/CA { /StrokeConstantAlpha gput } bdef
/SMask { /SoftMask gput } bdef
/AIS { /AlphaIsShape gput } bdef
/BM {
  /.setblendmode where {
    pop [ exch dup type /nametype ne { aload pop } if /Normal ] {
      { .setblendmode } .internalstopped not { exit } if pop
    } forall
  } {
    pop
  } ifelse
} bdef
/TK {
  /.settextknockout where { pop .settextknockout } { pop } ifelse
} bdef

% ---------------- Color installation ---------------- %

% Establish a given color (and color space) as current.
/.settransparencyparams {	% <alpha> <smask> .settransparencyparams -
  /.begintransparencymask where {
    pop AlphaIsShape {
      1 .setopacityalpha 0 .inittransparencymask exch .setshapealpha 1
    } {
      1 .setshapealpha 1 .inittransparencymask exch .setopacityalpha 0
    } ifelse
	% Set the soft mask by rendering the XObject.  Doing this every time
	% is obviously very inefficient; we'll improve it later.
    .settransparencymask    
  } {
    pop pop
  } ifelse
} bdef
/.settransparencymask {		% <paramdict> <masknum> .settransparencymask -
  exch dup null eq {
    pop .inittransparencymask
  } {
    dup /Draw get exec
  } ifelse
} bdef
% (Non-mask) images must execute setfillblend.
/setfillblend {
  FillOverprint setoverprint
  FillConstantAlpha SoftMask .settransparencyparams
} def
/setfillstate {
  FillColor FillColorSpace setgcolor setfillblend
} def
/setstrokestate {
  StrokeColor StrokeColorSpace setgcolor StrokeOverprint setoverprint
  StrokeConstantAlpha SoftMask .settransparencyparams
} def
/Cdict 15 dict dup begin	% <color...> <colorspace> -proc- -
  /DeviceGray { pop setgray } bdef
  /DeviceRGB { pop setrgbcolor } bdef
  /DeviceCMYK { pop setcmykcolor } bdef
  /CIEBasedA
   { dup currentcolorspace eq { pop } { setcolorspace } ifelse setcolor } bdef
  /CIEBasedABC /CIEBasedA load def
  /CIEBasedDEF /CIEBasedA load def
  /CIEBasedDEFG /CIEBasedA load def
  /ICCBased /CIEBasedA load def
  /Separation /CIEBasedA load def
  /DeviceN /CIEBasedA load def
  /Indexed /CIEBasedA load def
  /Pattern
   { dup currentcolorspace eq { pop } { setcolorspace } ifelse
     dup /Matrix .knownget not { matrix } if
     gsave DefaultMatrix setmatrix makepattern grestore setcolor
   } bdef
end def
/setgcolor	% (null | <color...>) <colorspace> setgcolor -
 { 1 index null eq
    { pop pop }
    { dup 0 get //Cdict exch get exec }
   ifelse
 } bdef
/fsexec		% <fillop|strokeop> fsexec -
 {		% Preserve the current point, if any.
    { currentpoint } stopped
    { $error /newerror false put   cvx exec }
    { 3 -1 roll cvx exec moveto }
   ifelse
 } bdef

% ---------------- Path painting and clipping ---------------- %

/S { setstrokestate /stroke fsexec } bdef
/f { setfillstate /fill fsexec } bdef
/f* { setfillstate /eofill fsexec } bdef
/n { newpath } bdef		% don't allow n to get bound in
/s { closepath S } bdef
/B { gsave setfillstate fill grestore S } bdef
/b { closepath B } bdef
/B* { gsave setfillstate eofill grestore S } bdef
/b* { closepath B* } bdef

% Clipping:

/Wdict 4 dict dup begin
/S { gsave setstrokestate stroke grestore n } bdef
/f { gsave setfillstate fill grestore n } bdef
/f* { gsave setfillstate eofill grestore n } bdef
/n { end clip newpath } bdef
end readonly def
/W { //Wdict begin } bdef
/W*dict 4 dict dup begin
Wdict { def } forall
/n { end eoclip newpath } bdef
end readonly def
/W* { //W*dict begin } bdef

% ---------------- Text control ---------------- %

/textbeginpage
 { /TextSpacing 0 def		% 0 Tc
   /TextLeading 0 def		% 0 TL
   /TextRenderingMode 0 def	% 0 Tr
   /TextRise 0 def		% 0 Ts
   /WordSpacing 0 def		% 0 Tw
   /TextHScaling 1.0 def	% 100 Tz
   /TextFont null def
   /Show { showfirst } def
 } bdef

% Contrary to the statement in the PDF manual, BT and ET *can* be nested,
% if the CharProc for a Type 3 font does a BT/ET itself.
% Since we always call the CharProc inside a q/Q, we simply ensure that
% the text state is saved and restored like the rest of the extended
% graphics state.

/settextmatrix {
  TextMatrix concat
  TextHScaling 1 ne { TextHScaling 1 scale } if
  TextRise 0 ne { 0 TextRise translate } if
  TextFont dup null eq { pop } { setfont } ifelse
} bdef
/settextstate {
	% The text state can be set even outside BT/ET.
  currentdict /TextSaveMatrix known {
    TextSaveMatrix setmatrix settextmatrix
  } if
} bdef
/settextposition {
		% Update the TextMatrix translation.
  gsave TextSaveMatrix setmatrix
  currentpoint TextMatrix 4 2 getinterval astore pop
		% We would like to do "grestore currentpoint translate"
		% here, but some PDF files set a singular text matrix
		% (0 0 0 0 <x> <y> Tm), so we can't do this.
  TextTempMatrix identmatrix setmatrix currentpoint
  grestore
  TextTempMatrix currentmatrix 4 2 getinterval astore pop
  TextTempMatrix setmatrix
} bdef

/BT {
  currentdict /TextLineMatrix .knownget
    { identmatrix pop TextMatrix identmatrix pop }
    { matrix /TextLineMatrix gput matrix /TextMatrix gput }
  ifelse
  { showfirst } /Show gput
  currentdict /TextSaveMatrix .knownget not {
    matrix dup /TextSaveMatrix gput
  } if currentmatrix pop settextmatrix
  matrix /TextTempMatrix gput		% see settextposition
} bdef
/ET {
  TextRenderingMode 4 ge { clip newpath } if
  TextSaveMatrix setmatrix
  currentdict /TextSaveMatrix undef
} bdef
/Tc { /TextSpacing gput { showfirst } /Show gput } bdef
/TL { /TextLeading gput } bdef
/Tr { /TextRenderingMode gput { showfirst } /Show gput } bdef
/Ts { /TextRise gput settextstate } bdef
/Tw { /WordSpacing gput { showfirst } /Show gput } bdef
/Tz { 100 div /TextHScaling gput settextstate} bdef

% ---------------- Font control ---------------- %

/Tf {		% <font> <scale> Tf -
  dup 1 eq { pop } { scalefont } ifelse
  /TextFont gput settextstate
} bdef

% Read a CFF font.
/FRD		% <resname> <file> FRD -
 { /FontSetInit /ProcSet findresource begin true ReadData
 } bdef

% Copy a font, removing its FID.  If changed is true, also remove
% the UniqueID and XUID, if any.  If the original dictionary doesn't have
% the keys being removed, don't copy it.
/.copyfontdict		% <font> <changed> .copyfontdict <dict>
 { 1 index /FID known
   1 index { 2 index /UniqueID known or 2 index /XUID known or } if
    {		% We add 1 to the length just in case the original
		% didn't have a FID.
      exch dup length 1 add dict exch
       {		% Stack: changed newfont key value
	 1 index /FID eq 4 index
	  { 2 index /UniqueID eq or 2 index /XUID eq or }
	 if not { 3 copy put } if pop pop
       }
      forall exch
    }
   if pop
 } bdef

% Insert a new Encoding or Metrics into a font if necessary.
% Return a possibly updated font, and a flag to indicate whether
% the font was actually copied.
/.updatefontmetrics {	% <font> <Metrics|null> .updatefontmetrics
			%   <font'> <copied>
  dup null ne {
    exch true .copyfontdict dup /Metrics 4 -1 roll put true
  } {
    pop false
  } ifelse
} bdef
/.updatefontencoding {	% <font> <Encoding|null> .updatefontencoding
			%   <font'> <copied>
  dup null ne { dup 2 index /Encoding get ne } { false } ifelse {
    exch false .copyfontdict dup /Encoding 4 -1 roll put true
  } {
    pop false
  } ifelse
} bdef
/.updatefont {		% <font> <Encoding|null> <Metrics|null> .updatefont
			%   <font'> <copied>
  3 -1 roll exch .updatefontmetrics
			% Stack: enc|null font' copied
  3 1 roll exch .updatefontencoding 3 -1 roll or
} bdef

% ---------------- Text positioning ---------------- %

/Td {
  TextLineMatrix transform TextLineMatrix 4 2 getinterval astore pop
  TextLineMatrix TextMatrix copy pop settextstate
} bdef
/TD { dup neg /TextLeading gput Td } bdef
/T* { 0 TextLeading neg Td } bdef
/Tm {
  TextLineMatrix astore TextMatrix copy pop settextstate
} bdef

% ---------------- Text painting ---------------- %

/Vexch {
  rootfont /WMode .knownget { 1 eq { exch } if } if
} bind def

/textrenderingprocs [		% (0 is handled specially)
	% Painting-only modes
   { tf } { tS } { tB } { tn }
	% Clipping modes
   { gsave tf grestore tW }
   { gsave tS grestore tW }
   { gsave tB grestore tW }
   { tW }
] readonly def
/setshowstate
 { WordSpacing 0 eq TextSpacing 0 eq and
    { TextRenderingMode 0 eq
       { { setfillstate show } }
       { { false charpath textrenderingprocs TextRenderingMode get exec } }
      ifelse
    }
    { TextRenderingMode 0 eq
       { WordSpacing 0 eq
          { { setfillstate TextSpacing 0 Vexch 3 -1 roll ashow } }
	  { TextSpacing 0 eq
            { { setfillstate WordSpacing 0 Vexch 32 4 -1 roll widthshow } }
            { { setfillstate WordSpacing 0 Vexch 32
                 TextSpacing 0 Vexch 6 -1 roll awidthshow } }
	    ifelse
	  }
	 ifelse
       }
       { { WordSpacing TextSpacing
			% Implement the combination of t3 and false charpath.
			% Note that we must use cshow for this, because we
			% can't parse multi-byte strings any other way.
			% Stack: string xword xchar
	    { pop pop (x) dup 0 3 index put false charpath
			% Stack: xword xchar ccode
             3 copy 32 eq { add } { exch pop } ifelse 0 Vexch rmoveto pop
	    }
	   4 -1 roll cshow pop pop
	   textrenderingprocs TextRenderingMode get exec
	 }
       }
      ifelse
    }
   ifelse /Show gput
 } bdef
/showfirst { setshowstate Show } def

/Tj {
  0 0 moveto Show settextposition
} bdef
/' { T* Tj } bdef
/" { exch Tc exch Tw T* Tj } bdef
/TJ {
  0 0 moveto {
    dup type /stringtype eq {
      Show
    } { -1000 div
      currentfont /ScaleMatrix .knownget { 0 get mul } if
      0 Vexch rmoveto
    } ifelse
  } forall settextposition
} bdef

/tf { setfillstate currentpoint fill moveto } bdef
/tn { currentpoint newpath moveto } bdef
% For stroking characters, temporarily restore the graphics CTM so that
% the line width will be transformed properly.
/Tmatrix matrix def
/tS
 { setstrokestate
   currentpoint //Tmatrix currentmatrix TextSaveMatrix setmatrix stroke
   setmatrix moveto
 } bdef
/tB { gsave tf grestore tS } bdef
% This does the wrong thing if there have been multiple text operations
% within a single BT/ET pair, but it's a start.
/tW { } bdef

end readonly put		% GS_PDF_ProcSet

.setglobal