File: gs_ll3.ps

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%    Copyright (C) 1997, 2000 Aladdin Enterprises.  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.
% 
% For more information about licensing, please refer to
% http://www.ghostscript.com/licensing/. For information on
% commercial licensing, go to http://www.artifex.com/licensing/ or
% contact Artifex Software, Inc., 101 Lucas Valley Road #110,
% San Rafael, CA  94903, U.S.A., +1(415)492-9861.

% $Id: gs_ll3.ps 10300 2009-11-09 18:42:04Z alexcher $
% Initialization file for PostScript LanguageLevel 3 functions.
% This file must be loaded after gs_lev2.ps and gs_res.ps.
% These definitions go into ll3dict or various ProcSets.
% NOTE: the interpreter creates ll3dict.

ll3dict begin

% We need LanguageLevel 2 or higher in order to have setuserparams and
% defineresource.
languagelevel dup 2 .max .setlanguagelevel

% ------ Idiom recognition ------ %

/IdiomRecognition false .definepsuserparam

% Modify `bind' to apply idiom recognition afterwards.
/.bindscratch 128 string def
% Note that since this definition of `bind' may get bound in,
% it has to function properly even at lower language levels,
% where IdiomRecognition may not be defined.
/.bind_ {		% <proc> .bind <proc'>
  //.bind currentuserparams /IdiomRecognition
  .knownget not { false } if {
    (*) {
      /IdiomSet findresource
      false exch {
		% Stack: proc false dummykey [template substitute]
	exch pop dup 1 get exch 0 get
		% Stack: proc false substitute template
	3 index .eqproc {
	  2 index gcheck 1 index gcheck not and {
	    pop
	  } {
	    3 -1 roll pop exch not exit
	  } ifelse
	} {
	  pop
	} ifelse
      } forall { exit } if
    } //.bindscratch /IdiomSet resourceforall
  } if
} def
/.bind /.bind_ load odef	% note that .bind_ will get bound
currentdict /.bindscratch .undef

DELAYBIND NOBIND or not { 
% We can't just do
%   /bind /.bind load def
% because then /bind load == prints --.bind-- .
  /bind {//.bind_ exec} odef
} if
currentdict /.bind_ undef

% ------ HalftoneTypes 6, 10, 16 and HalftoneMode ------ %

% This code depends on an internal HalftoneType 7 with the following keys:
%	Width, Height, Width2, Height2, TransferFunction:
%	  as for HalftoneType 16.
%	Thresholds: a string or bytestring holding the thresholds,
%	  (Width x Height + Width2 x Height2) x BitsPerSample / 8 bytes,
%	  as for HalftoneType 16 except that the samples may be either
%	  8 or 16 bits wide.
%	BitsPerSample: 8 or 16.

% Note that this HalftoneType never appears in halftone dictionaries given
% to sethalftone, only as a component in those given to .sethalftone5,
% so its numeric value can be chosen ad lib as long as it differs from the
% other values that are legal in component dictionaries for .sethalftone5
% (currently only 1 and 3).

/.makehalftone7 {	% <dict> <dict> <source> <Width> <Height>
			%   (<Width2> <Height2> | null) <BPS> .makehalftone7
			%   <setdict> <dict5> { .sethalftone5 }
  8 dict begin
  /HalftoneType 7 def
  /BitsPerSample exch def
  dup null eq {
    pop 0
  } {
    /Height2 1 index def /Width2 2 index def mul
  } ifelse 3 1 roll
  /Height 1 index def
  /Width 2 index def
  mul add BitsPerSample 8 idiv mul .bigstring
		% Stack: dict dict source str
  dup type /stringtype eq { readstring } { .readbytestring } ifelse
  not { /sethalftone .systemvar /rangecheck signalerror exit } if
  readonly /Thresholds exch def
  /TransferFunction .knownget { /TransferFunction exch def } if
		% If the original Thresholds was a file, replace it with
		% a new one.
  dup /Thresholds get type /filetype eq {
    dup /Thresholds [ Thresholds ] cvx 0 () .subfiledecode put
  } if
  mark /HalftoneType 5 /Default currentdict end .dicttomark
  { .sethalftone5 }
} bind def

/.bigstring {	% <size> .bigstring <string|bytestring>
  dup 65400 gt { .bytestring } { string } ifelse
} bind def

/.readbytestring {	% <source> <bytestring> .readbytestring
			%   <bytestring> <filled>
		% Note that since bytestrings don't implement getinterval,
		% if filled is false, there is no way to tell how much
		% was read.
  true exch 0 1 2 index length 1 sub {
		% Stack: source true str index
    3 index read not { pop exch not exch exit } if
    3 copy put pop pop
  } for 3 -1 roll pop exch
} bind def

/.sethalftone6 {	% <dict> <dict> .sethalftone6 <setdict> <dict5>
			%   { .sethalftone5 }
			% Keys: Width, Height, Thresholds, T'Function
  dup /Thresholds get
  1 index /Width get 2 index /Height get
  null 8 .makehalftone7
} bind def

/.sethalftone10 {	% <dict> <dict> .sethalftone10 <setdict> <dict5>
			%   { .sethalftone5 }
			% Keys: Xsquare, Ysquare, Thresholds, T'Function
		% Note that this is the only one of these three HalftoneTypes
		% that allows either a file or a string for Thresholds.
  dup /Thresholds get dup type /stringtype eq { 0 () .subfiledecode } if
  1 index /Xsquare get dup 3 index /Ysquare get dup
  8 .makehalftone7
} bind def

/.sethalftone16 {	% <dict> <dict> .sethalftone16 <setdict> <dict5>
			%   { .sethalftone5 }
			% Keys: Width, Height, Width2, Height2,
			%   Thresholds, T'Function
  dup /Thresholds get
  1 index /Width get 2 index /Height get
  3 index /Width2 .knownget {  % 2-rectangle case
    4 index /Height2 get
  } {			% 1-rectangle case
    null
  } ifelse 16 .makehalftone7
} bind def

.halftonetypes begin
  6 /.sethalftone6 load def
  10 /.sethalftone10 load def
  16 /.sethalftone16 load def
end

% Redefine the halftone-setting operators to honor HalftoneMode.
/setcolorscreen {
  /HalftoneMode getuserparam 0 eq {
    //setcolorscreen
  } {
    12 { pop } repeat .getdefaulthalftone
    { //sethalftone }
    { .setdefaulthalftone }
    ifelse
  } ifelse
} odef
/setscreen {
  /HalftoneMode getuserparam 0 eq {
    //setscreen
  } {
    pop pop pop .getdefaulthalftone
    { //sethalftone }
    { .setdefaulthalftone }
    ifelse
  } ifelse
} odef
/sethalftone {
  /HalftoneMode getuserparam 0 eq {
    //sethalftone
  } {
    gsave //sethalftone grestore
    .getdefaulthalftone
    { //sethalftone }
    { .setdefaulthalftone }
    ifelse
  } ifelse
} odef

% ------ ImageTypes 3 and 4 (masked images) ------ %

% Put the new data source in the requested dictionary.
% Copy the updated dictionary because it nay be used elsewhere.
% <dict> <data> <name> update_image3 <dict'>
/update_image3 {
  3 -1 roll dup length dict copy dup  % [data] /name <<image>> <<image>>
  2 index get                         % [data] /name <<image>> <<sub-image>>
  dup length dict copy dup            % [data] /name <<image>> <<sub-image>> <<sub-image>>
  /DataSource 6 -1 roll put           % /name <<image>> <<sub-image>>
  exch dup                            % /name <<sub-image>> <<image>> <<image>>
  4 2 roll                            % <<image>> <<image>> /name <<sub-image>>
  put                                 % <<image>>
} bind def

% Copy mask data source to a reusable stream
% <dict> <source> buffer_mask <dict> <file>
/buffer_mask {
  1 index /MaskDict get
  dup /Width get
  1 index /BitsPerComponent get mul 7 add 8 idiv
  exch /Height get mul () /SubFileDecode filter
  /ReusableStreamDecode filter
} bind def

% Data type vs. mask type decission table.
% All procedures have the signature:
% <image dict> <data DataSource> <mask DataSource> proc <image dict'>
/data_mask_dict mark
  /stringtype mark % data is a string
    /stringtype { pop pop } bind
    /arraytype { % convert data to proc, don't buffer mask
      pop
      dup type dup /arraytype eq exch /packedarraytype eq or {
        [ exch { 1 array astore cvx } forall ]
      } {
        1 array astore cvx
      } ifelse
      /DataDict //update_image3 exec
    } bind
    /packedarraytype 1 index
    /filetype { % convert data to file, don't buffer mask
      pop
      dup type dup /arraytype eq exch /packedarraytype eq or {
        [ exch { 1 array astore cvx 0 () /SubFileDecode filter } forall ]
      } {
        1 array astore cvx 0 () /SubFileDecode filter
      } ifelse
      /DataDict //update_image3 exec
    } bind
  .dicttomark readonly
  /arraytype mark  % data is a proc
    /stringtype { % convert mask to proc
      exch pop
      1 array astore cvx
      /MaskDict //update_image3 exec
    } bind
    /arraytype { % buffer mask in reusable stream and convert back to proc
      exch pop
      //buffer_mask exec
      500 string
      { readstring pop } aload pop
      4 packedarray cvx
      /MaskDict //update_image3 exec
    } bind
    /packedarraytype 1 index
    /filetype 1 index
  .dicttomark readonly
  /packedarraytype 1 index
  /filetype mark  % data is a file
    /stringtype { % convert mask to file
      exch pop
      1 array astore cvx 0 () /SubFileDecode filter
      /MaskDict //update_image3 exec
    } bind
    /arraytype { % buffer the mask and convert to file
      exch pop
      //buffer_mask exec
      /MaskDict //update_image3 exec
    } bind
    /packedarraytype 1 index
    /filetype {
      //systemdict /userdict get /PDFTopSave known {
        pop pop   % mask is already buffered by PDF interpreter
      } {
        exch pop  % buffer the mask
        //buffer_mask exec
        /MaskDict //update_image3 exec
      } ifelse
    } bind
  .dicttomark readonly
.dicttomark readonly def

.imagetypes
  dup 3 {
    dup /InterleaveType get 3 eq {
      % .image3 requires data sources of the image and mask to be of the
      % same type. Work around this restriction here.
      dup /DataDict get /DataSource get
      1 index /MaskDict get /DataSource get  % <<>> data mask
      dup type                               % <<>> data mask mask_type
      2 index
      4 index /DataDict get /MultipleDataSources .knownget {
        { 0 get } if
      } if
      type                                   % <<>> data mask mask_type data_type
      //data_mask_dict exch .knownget {
        exch .knownget {
          exec
        } {
          pop pop   % pass wrong type as is to .image3
        } ifelse
      } {
        pop pop pop % pass wrong type as is to .image3
      } ifelse
    } if
    .image3
  } bind put
  dup 4 /.image4 load put
% We also detect ImageType 103 here: it isn't worth making a separate file
% just for this.
  /.image3x where { pop dup 103 /.image3x load put } if
pop

currentdict /data_mask_dict undef
currentdict /update_image3 undef
currentdict /buffer_mask undef

% ------ Functions ------ %

% Define the FunctionType resource category.
/Generic /Category findresource dup maxlength 3 add dict .copydict begin
  /InstanceType /integertype def
/FunctionType currentdict end /Category defineresource pop

{0 2 3} { dup /FunctionType defineresource pop } forall

% ------ Smooth shading ------ %

% Define the ShadingType resource category.
/Generic /Category findresource dup maxlength 3 add dict .copydict begin
  /InstanceType /integertype def
/ShadingType currentdict end /Category defineresource pop

systemdict /.shadingtypes mark		% not ll3dict
  1 /.buildshading1 load
  2 /.buildshading2 load
  3 /.buildshading3 load
  4 /.buildshading4 load
  5 /.buildshading5 load
  6 /.buildshading6 load
  7 /.buildshading7 load
.dicttomark put

systemdict /.reuseparamdict mark
  /Intent 2
  /AsyncRead false
  /CloseSource true
.dicttomark readonly put
/.buildshading {	% <shadingdict> .buildshading <shading>
  dup rcheck not {
      % Adobe seems to access ColorSpace first and CET 12-14c checks this.
      /$error .systemvar /errorinfo [ /ColorSpace null ] put
      /shfill .systemvar /invalidaccess signalerror
  } if
        % Unfortunately, we always need to make the DataSource reusable,
        % because if clipping is involved, even shfill may need to read
        % the source data multiple times.  If it weren't for this,
        % we would only need to create a reusable stream if the ultimate
        % source of the data is a procedure (since the library can't
        % suspend shading to do a procedure callout).
  dup /DataSource .knownget {
    dup type /filetype eq {
      //.reuseparamdict /ReusableStreamDecode filter
      % Copy the dictionary to replace the DataSource, but make sure the
      % copy is in the same VM as the original.
      .currentglobal 2 index gcheck .setglobal
		% Stack: shdict rsdfile saveglobal
      2 index dup length dict copy exch .setglobal
      dup /DataSource 4 -1 roll put exch pop
    } {
      pop
    } ifelse
  } if
	% The .buildshading operators use the current color space
	% for ColorSpace.
  dup /ShadingType .knownget not { % error handling for CET 12-14b conformance
     /$error .systemvar /errorinfo [ /ShadingType //null ] put
     /shfill .systemvar /undefined signalerror
  } if
  dup type /integertype ne {
     /$error .systemvar /errorinfo [ /ShadingType 4 index ] put
     /shfill .systemvar /typecheck signalerror
  } if
  //.shadingtypes 1 index .knownget not {
     /$error .systemvar /errorinfo [ /ShadingType 4 index ] put
     /shfill .systemvar /rangecheck signalerror
  } if
  exch pop 1 index /ColorSpace .knownget {
    { setcolorspace } stopped {
       /$error .systemvar /errorinfo [ /ColorSpace 4 index ] put
       /shfill .systemvar /$error .systemvar /errorname get signalerror
    } if
    exec
  } { 
    /$error .systemvar /errorinfo [ /ColorSpace //null ] put
    /shfill .systemvar /undefined signalerror
  } ifelse
} bind def
systemdict /.reuseparamdict undef

/.buildpattern2 {	% <template> <matrix> .buildpattern2
			%   <template> <pattern>
	% We want to build the pattern without doing gsave/grestore,
	% since we want it to load the CIE caches.
  1 index /Shading get
  mark currentcolor currentcolorspace
  counttomark 4 add -3 roll mark 4 1 roll
	% Stack: -mark- ..color.. cspace -mark- template matrix shadingdict
  { .buildshading } stopped {
    cleartomark setcolorspace setcolor pop stop
  } if
  .buildshadingpattern
  3 -1 roll pop counttomark 1 add 2 roll setcolorspace setcolor pop
} bind def

.patterntypes
  2 /.buildpattern2 load put

/shfill {		% <shadingdict> shfill -
	% Currently, .shfill requires that the color space
	% in the pattern be the current color space.
	% Disable overprintmode for shfill
  { dup gsave 0 .setoverprintmode .buildshading .shfill } stopped
  grestore {
    /$error .systemvar /errorinfo 2 copy known {
      pop pop
    } {
      //null put  % CET 12-14c
    } ifelse
    stop
  } if
  pop
} odef

% Establish an initial smoothness value that matches Adobe RIPs.
0.02 setsmoothness

% ------ DeviceN color space ------ %
% gs_res.ps uses these entries in colorspacedict
% to populate the ColorSpaceFamily resource, so we need
% to add the supported spaces.
%
systemdict /colorspacedict get begin
/CIEBasedDEF [] def
/CIEBasedDEFG [] def
/DeviceN [] def
end

% ------ Miscellaneous ------ %

% Make the setoverprintmode and currentoverprintmode operators visible (3015)
% Because of the requirements of PDF, the .currentoverprintmode and
% .setoverprintmode operators have integer parameters.  Thus we need to
% convert the Postscript bool parameters to integers.
%
/setoverprintmode 		% bool setoverprint -
{
  { 1 } { 0 } ifelse		% convert bool to integer
  //.setoverprintmode
} odef

/currentoverprintmode 		% - currentoverprintmode bool
{
  //.currentoverprintmode
  0 ne				% convert integers to bool
} odef

% Define additional user and system parameters.
/HalftoneMode 0 .definepsuserparam
/MaxSuperScreen 1016 .definepsuserparam
pssystemparams begin		% read-only, so use .forcedef
  /MaxDisplayAndSourceList 160000 .forcedef
end

% Define the IdiomSet resource category.
{ /IdiomSet } {
  /Generic /Category findresource dup maxlength 3 add dict .copydict begin
    /InstanceType /dicttype def
  currentdict end /Category defineresource pop
} forall

/languagelevel 3 def
% When running in LanguageLevel 3 mode, this interpreter is supposed to be
% compatible with Adobe version 3010.
/version (3010) readonly def

.setlanguagelevel

end			% ll3dict