gs_pdfwr.ps

GhostScript的源代码

%    Copyright (C) 1996, 1997, 1998 Aladdin Enterprises.  All rights reserved.
%
% This file is part of Aladdin Ghostscript.
% 
% Aladdin 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 Ghostscript Free Public
% License (the "License") for full details.
% 
% Every copy of Aladdin 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 Aladdin 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_pdfwr.ps $
% gs_pdfwr.ps
% PDF writer additions to systemdict.

% This file should be included iff the pdfwrite "device" is included
% in the executable.

% Redefine pdfmark to pass the data to the driver.
% We use a pseudo-parameter named /pdfmark whose value is an array:
%	key1 value1 ... CTM /type
/.pdf===dict mark
  /arraytype
   { dup xcheck { ({) (}) } { ([) (]) } ifelse
		% Stack: file obj left right
      4 1 roll 2 index exch writestring () exch
       { exch 2 index exch writestring
	 1 index exch pdfmark===only ( )
       }
      forall pop exch writestring
   } bind
  /packedarraytype 1 index
  /dicttype
   { 1 index (<<\n) writestring
      { 2 index 3 -1 roll pdfmark===only 1 index ( ) writestring
	1 index exch pdfmark===only dup (\n) writestring
      }
     forall (>>) writestring
   } bind
.dicttomark readonly def
/pdfmark===only		% <file> <obj> pdfmark===only -
 { .pdf===dict 1 index type .knownget { exec } { write==only } ifelse
 } bind def
/.pdfcvs		% <obj> .pdfcvs <string>
 {		% We can't handle long values yet.
   =string /NullEncode filter dup 2 index pdfmark===only
   dup (\n\000) writestring closefile pop
   =string (\n\000) search
    { dup length string copy exch pop exch pop }
    {		% The converted representation didn't fit.  Punt.
      pop (???)
    }
   ifelse
 } bind def
/.pdfputparams {	% -mark- <key1> <value1> ... .pdfputparams <result...>
  currentdevice null false counttomark 1 add 3 roll
		% Don't allow the page device to get cleared....
  {.putdeviceparams} .currentpagedevice pop {.setpagedevice} 3 .execn
} bind def
% The procedures in the following dictionary are called with the entire
% pdfmark operand list (including the pdfmark name) on the stack;
% they may modify this ad lib.  They should return true if all operands
% should be converted with .pdfcvs, false if the operands are key/value
% pairs and only the even-numbered ones should be converted.
/.pdfmarkparams mark
  /SP { true }
  /CLOSE { true }
	% Unpack a dictionary for PUT.
	% Eventually we should do this for streams too.
  /PUT {
    counttomark 3 eq {
      1 index type /dicttype eq { pop { } forall /.PUTDICT } if
    } if true
  } bind
	% Unpack the array for PUTINTERVAL.
  /PUTINTERVAL {
    pop aload pop /.PUTINTERVAL true
  } bind
.dicttomark readonly def
/pdfmark		% -mark- <key> <value> ... <markname> pdfmark -
 { counttomark 1 add copy
   //.pdfmarkparams 1 index .knownget { exec } { false } ifelse
   matrix currentmatrix .pdfcvs 3 1 roll
   counttomark 1 add 1 roll ] exch
    { 0 1 } { 1 2 } ifelse
   2 index length 3 sub { 2 copy 2 copy get .pdfcvs put pop } for
   mark /pdfmark 3 -1 roll .pdfputparams
   type /booleantype ne { cleartomark } if cleartomark
 } odef
userdict /pdfmark .undef
currentdict /.pdfmarkparams .undef

% Define setdistillerparams / currentdistillerparams.
% Distiller parameters are currently treated as device parameters.
/.distillerparamkeys mark
		% General parameters
  /ASCII85EncodePages { }
  /AutoRotatePages { }
  /CompatibilityLevel { }
  /CompressPages { }
  /CoreDistVersion { }
  /ImageMemory { }
  /LZWEncodePages { }
  /PreserveHalftoneInfo { }
  /PreserveOPIComments { }
  /PreserveOverprintSettings { }
  /TransferFunctionInfo { }
  /UCRandBGInfo { }
  /UseFlateCompression { }
		% Color sampled image parameters
  /ColorACSDict { }
  /AntiAliasColorImages { }
  /AutoFilterColorImages { }
  /ColorImageDepth { }
  /ColorImageDict { }
  /DownsampleColorImages { }
  /ColorImageDownsampleType { }
  /EncodeColorImages { }
  /ColorImageFilter { }
  /ColorImageResolution { }
  /ColorConversionStrategy { }
  /ConvertCMYKImagesToRGB { }
  /ConvertImagesToIndexed { }
		% Grayscale sampled image parameters
  /GrayACSDict { }
  /AntiAliasGrayImages { }
  /AutoFilterGrayImages { }
  /GrayImageDepth { }
  /GrayImageDict { }
  /DownsampleGrayImages { }
  /GrayImageDownsampleType { }
  /EncodeGrayImages { }
  /GrayImageFilter { }
  /GrayImageResolution { }
		% Monochrome sampled image parameters
  /AntiAliasMonoImages { }
  /MonoImageDepth { }
  /MonoImageDict { }
  /DownsampleMonoImages { }
  /MonoImageDownsampleType { }
  /EncodeMonoImages { }
  /MonoImageFilter { }
  /MonoImageResolution { }
		% Font embedding parameters
  /AlwaysEmbed
   { dup length 0 gt
      { dup 0 get false eq
         { dup length 1 sub 1 exch getinterval exch pop /~AlwaysEmbed exch
         } if
      } if
   }
  /NeverEmbed
   { dup length 0 gt
      { dup 0 get false eq
         { dup length 1 sub 1 exch getinterval exch pop /~NeverEmbed exch
         } if
      } if
   }
  /EmbedAllFonts { }
  /SubsetFonts { }
  /MaxSubsetPct { }
.dicttomark readonly def
/.distillerdevice
 { currentdevice .devicename /pdfwrite eq
    { currentdevice }
    { /pdfwrite finddevice }
   ifelse
 } bind def
/setdistillerparams		% <dict> setdistillerparams -
 { .distillerdevice null false mark 4 index
    { //.distillerparamkeys 2 index .knownget { exec } { pop pop } ifelse }
   forall .putdeviceparams
   type /booleantype eq { pop } { cleartomark pop pop pop } ifelse pop
 } odef
/currentdistillerparams		% - currentdistillerparams <dict>
 { .distillerdevice //.distillerparamkeys .getdeviceparams .dicttomark
 } odef

% Patch the 'show' operators to pass the data to the device.
% We use pseudo-parameters named /show and /showxxx to pass the data,
% as documented in gdevpdft.c.  THIS IS A HACK.
%
% Note that the cx/y and ax/y values are in text space, not user space.
% We also fill an empty path in order to get the clipping region and
% current color set properly.  THIS IS A BIG HACK.
/.pdfknownfonts mark
  /Courier {StandardEncoding}
  /Courier-Bold 1 index
  /Courier-Oblique 1 index
  /Courier-BoldOblique 1 index
  /Helvetica 1 index
  /Helvetica-Bold 1 index
  /Helvetica-Oblique 1 index
  /Helvetica-BoldOblique 1 index
  /Times-Roman 1 index
  /Times-Bold 1 index
  /Times-Italic 1 index
  /Times-BoldItalic 1 index
  /Symbol {SymbolEncoding}
  /ZapfDingbats {DingbatsEncoding}
.dicttomark readonly def
.currentglobal false .setglobal
/.pdfknownids 50 dict .forcedef	% .pdfknownids is local, systemdict is global
.setglobal
/.findorigfont {	% <font> .findorigfont <origfont>
			% Check for a known font with the same name,
			% or one of the 14 known names,
			% and the same UniqueID.
  dup /UniqueID .knownget {
    .pdfknownids 1 index .knownget {
      exch pop dup null ne { true } { pop false } ifelse
    } {			% We haven't looked up the UniqueID yet.
			% Register the UniqueIDs of all fonts.
      .FontDirectory {
	exch pop dup /UniqueID .knownget {
			% Stack: font uniqueid somefont somefontid
	  exch .pdfknownids 3 1 roll put
	} {
	  pop
	} ifelse
      } forall
			% Register the UniqueIDs of the 14 built-in fonts,
			% to make sure they override any other fonts
			% with the same UniqueIDs.
      .pdfknownfonts {
	pop
	//systemdict /GlobalFontDirectory .knownget not { .FontDirectory } if
	1 index .knownget {
			% Stack: font uniqueid knownname knownfont
	  dup /UniqueID get exch .pdfknownids 3 1 roll put
	} if pop
      } forall
			% Now see if the UniqueID is known.
      .pdfknownids 1 index .knownget {
	exch pop true
      } {			% Record the UniqueID as not registered.
	.pdfknownids exch null put false
      } ifelse
    } ifelse
  } {			% This font has no UniqueID.
    false
  } ifelse
			% Stack: font knownfont -true- | font -false-
  {
    exch pop
  } {
    { dup /OrigFont .knownget not { exit } if exch pop } loop
  } ifelse
} .bind def
/.pdfdoshow {		% <string> -mark- {<cxd> <cyd> <char>} {<axd> <ayd>}
			%   .pdfdoshow <bool>
%vmstatus pop =only pop (, ) print
   ] /showValues exch
%vmstatus pop =only pop (, ) print
   mark /showX currentpoint transform /showY exch /show 9 -3 roll
   currentfont .findorigfont
		% Pass the original font name.
   dup /FontName get
   /showFontName exch 3 -1 roll
		% Concatenate the "quotient" of the current FontMatrix
		% and the FontMatrix of the original font.
		% Be sure to include any translation.
   /showMatrix
     exch /FontMatrix get matrix invertmatrix
     currentfont /FontMatrix get
     1 index concatmatrix
	% The matrix on the stack is now the font scaling matrix.
	% Use it to inverse-transform cx/y and ax/y, so they will be in
	% text space.
	% Stack: -mark- /showX <px> /showY <py> /show <string>
	%   /showValues <values> /showFontName <fontname> /showMatrix <matrix>
   4 index aload	%   ... {cx cy char} {ax ay} values
   dup length {
	{pop 6 -2 roll pop pop}
	1?
	{3 -2 roll 3 index idtransform 3 2 roll astore pop}
	{4 -2 roll 4 index idtransform 4 2 roll astore pop}
	4?
	{6 -2 roll 6 index idtransform 6 2 roll
	 3 -2 roll 6 index idtransform 3 2 roll astore pop}
   } exch get exec
%vmstatus pop =only pop (, ) print
	% Now construct the combined matrix.
	% This is equivalent to:
	%	matrix currentmatrix dup 4 0 put dup 5 0 put dup concatmatrix
	% but avoids allocating another matrix.
   aload 7 1 roll
   dtransform 7 2 roll dtransform 7 2 roll dtransform 7 2 roll
   astore
	% Omit either encoding that is StandardEncoding.
   /showEncoding currentfont /Encoding .knownget not { [] } if
     dup StandardEncoding eq { pop pop } if
	% Make a reasonable guess at the base encoding.
   /showBaseEncoding .pdfknownfonts 6 index	% FontName
     .knownget { exec } { StandardEncoding } ifelse
   dup StandardEncoding eq {
     pop pop
   } {
     currentfont /CharStrings .knownget { /showCharStrings exch } if
   } ifelse
%vmstatus pop =only pop (, ) print
		% Set the clipping region and color in the output.
		% This is another hack!
   gsave newpath fill grestore
%vmstatus pop =only pop (, ) print
   .pdfputparams
%vmstatus pop =only pop () = flush
   dup type /booleantype eq
    { pop pop true }
    { dup /undefined eq
       { cleartomark pop pop pop false }
       { dup mark eq { /unknown /rangecheck } if
	 counttomark 4 add 1 roll cleartomark pop pop pop
	 /.pdfshow cvx exch signalerror
       }
      ifelse
    }
   ifelse
 } .bind def
/.pdfexecshow		% <proc> .pdfexecshow -
 {		% Prevent output, but don't switch devices, since this
		% confuses the Pattern caching mechanism.
   gsave currentpoint newpath clip moveto exec currentpoint
   grestore moveto
 } .bind def
/.pdfwrite?		% - .pdfwrite? <bool>
 { currentdevice .devicename /pdfwrite eq
   currentfont /FontType get 1 eq and
 } .bind def
% .pdfshow isn't an operator per se, but it still needs to be careful with
% the stack so that the operators will have stack protection.
/.pdfshow		% <string> -mark- {<cx> <cy> <char>} {<ax> <ay>}
			%   <showproc> .pdfshow -
 { counttomark 2 add 1 roll .pdfwrite?
    { .pdfdoshow }
    { cleartomark pop false }
   ifelse
    { .pdfexecshow }
    { exec }
   ifelse
 } .bind def
/show
 { dup mark { show } .pdfshow
 } .bind odef
/ashow
 { dup mark 4 index 4 index { ashow } .pdfshow
 } .bind odef
/widthshow
 { 4 copy mark 5 2 roll { widthshow } .pdfshow
 } .bind odef
/awidthshow
 { 6 copy mark 7 2 roll { awidthshow } .pdfshow
 } .bind odef
/glyphshow where { pop } { (%END) .skipeof } ifelse
/glyphshow
 { .pdfwrite?
    { currentfont /Encoding .knownget not { {} } if
      0 1 2 index length 1 sub
       {		% Stack: glyph encoding index
	 2 copy get 3 index eq { exch pop exch pop null exit } if pop
       }
      for null eq
       { (X) dup 0 3 index put show pop }
       { glyphshow }
      ifelse
    }
    { glyphshow
    }
   ifelse
 } .bind odef
%END
/.kshow1 {	% <index> <proc> <string> .kshow1
  (X) dup 0 3 index 6 index get put show
  2 index 1 index length 1 sub lt {
    dup 3 index get exch 4 -1 roll 1 add get
    3 -1 roll exec
  } {
    pop pop pop
  } ifelse
} .bind def
/kshow {
  .pdfwrite? {
		% Construct a closure, and work character by character.
    0 1 2 index length 1 sub 5 -2 roll
    //.kshow1 /exec cvx 4 packedarray cvx for
  } {
    kshow
  } ifelse
} .bind odef
% The remaining operators aren't implemented correctly.
/xshow where {
 pop /xshow { .pdfwrite? { 1 index show pop pop } { xshow } ifelse } .bind odef
} if
/yshow where {
 pop /yshow { .pdfwrite? { 1 index show pop pop } { yshow } ifelse } .bind odef
} if
/xyshow where {
 pop /xyshow { .pdfwrite? { 1 index show pop pop } { xyshow } ifelse } .bind odef
} if