harvey/sys/lib/ghostscript/gs_ll3.ps

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% 
% This file is part of AFPL Ghostscript.
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% "License") for full details.
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% 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_ll3.ps,v 1.10 2001/07/12 05:47:07 lpd Exp $
% 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
% Do the right thing if NOBIND or DELAYBIND is in effect.
% Note also 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 load /.bind load ne
/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
} odef
{ /.bind /bind load def
  /bind { } def
} if
currentdict /.bindscratch .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 load /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
  } {
    pop .getdefaulthalftone
    { //sethalftone }
    { .setdefaulthalftone }
    ifelse
  } ifelse
} odef

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

.imagetypes
  dup 3 /.image3 load 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

% ------ 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>
        % 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
      .currentglobal 1 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 get //.shadingtypes exch get
  1 index /ColorSpace get setcolorspace exec
} 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.
  dup gsave { .buildshading .shfill } stopped grestore { stop } if
  pop
} odef

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

% ------ UseCIEColor ------ %

% The library maintains and detects the UseCIEColor device parameter,
% but it doesn't have access to the resource dictionaries.  We also
% want color space substitution to work in systems without a PostScript
% interpreter.  Therefore, we eagerly inform the library of changes in
% the (effective) ColorSpace category that might affect the operation of
% UseCIEColor.  We must notice the following events:
%	1) defineresource and undefineresource of the Default ColorSpaces.
%	2) restore.
%	3) Changes in current VM, which cause a different set of resources
%	to become visible.
% #1 is rare.  #2 is handled in C code.  If checking the ColorSpace
% category on #3 turns out to be expensive, we can cache more information
% about whether these operations actually affect UseCIEColor.

% This operator implements color space substitution in the library:
%	<index> <bool> .setsubstitutecolorspace -
% <bool> = true means substitute the current color space for the one given
% by <index>; <bool> = false means stop substituting.  Substitution is not
% affected by grestore/setgstate, but it is affected by restore.

% ColorSpace defineresource and undefineresource for the Default keys
% call .definedefaultcs and .undefinedefaultcs.  See gs_res.ps.

/.useciecolorkeydict mark
  /UseCIEColor null
.dicttomark readonly def
/.definedefaultcs {	% <index> <value> .definedefaultcs -
  currentcolorspace
	% Temporarily disable color substitution, in case the substitute
	% color space is or mentions a color space that is currently
	%  being substituted.
  currentdevice //.useciecolorkeydict .getdeviceparams exch pop exch pop
  mark 5 -2 roll
	% Stack: cspace UseCIEColor mark index value
   { setcolorspace true .setsubstitutecolorspace }
  stopped counttomark 1 add 1 roll cleartomark
	% Stack: cspace UseCIEColor stopped?
  3 1 roll
  currentdevice null true mark /UseCIEColor 6 -1 roll .putdeviceparams pop pop
  setcolorspace { stop } if
} bind def
currentdict /.useciecolorkeydict undef

/.undefinedefaultcs {	% <index> .undefinedefaultcs -
  false .setsubstitutecolorspace
} bind def

/.setdefaultcs {	% <index> <value|null> .setdefaultcs -
  dup null eq { pop .undefinedefaultcs } { .definedefaultcs } ifelse
} bind def

/.getdefaultcs {	% <key> .getdefaultcs <value|null>
  .GetInstance { 0 get } { null } ifelse
} bind def

/.setglobal {		% <bool> .setglobal -
  dup .currentglobal ne {
	% If there are no local definitions of the Default keys,
	% changing VM can't affect the definition of any resource.
    /.localcsdefaults .uservar {
	% We only want to change substitutions for color spaces
	% whose definitions are actually changing.
      /ColorSpace /Category findresource begin
      /DefaultGray .getdefaultcs
      /DefaultRGB .getdefaultcs
      /DefaultCMYK .getdefaultcs
      end
      3 index .setglobal
      /ColorSpace /Category findresource begin
      /DefaultGray .getdefaultcs
      /DefaultRGB .getdefaultcs
      /DefaultCMYK .getdefaultcs
      end
			% Stack: bool oldgray oldrgb oldcmyk
			%   newgray newrgb newcmyk
      dup 4 index ne { 2 exch .setdefaultcs } { pop } ifelse
      dup 4 index ne { 1 exch .setdefaultcs } { pop } ifelse
      dup 4 index ne { 0 exch .setdefaultcs } { pop } ifelse
      pop pop pop pop
    } {
      .setglobal
    } ifelse
  } {
    .setglobal
  } ifelse
} .bind odef		% bind in .setglobal


% Define default device color spaces to allow substitution
% on UseCIEColor == true :

/DefaultGray
[ /CIEBasedA
  3 dict begin
     /WhitePoint [ 0.9505 1.0 1.089 ] def
     /DecodeLMN  [ { 1.8 exp } { 1.8 exp } { 1.8 exp } ] def
     /MatrixLMN  [ 0.4439 0.2522 0.0436 0.3341 0.6371 0.1387 0.1725 0.1107 0.9067 ] def
  currentdict end
]
/ColorSpace defineresource pop

/DefaultRGB
[ /CIEBasedABC
  3 dict begin
     /WhitePoint [ 0.9505 1.0 1.089 ] def
     /DecodeLMN  [ { 1.8 exp } { 1.8 exp } { 1.8 exp } ]  def
     /MatrixLMN  [ 0.4439 0.2522 0.0436 0.3341 0.6371 0.1387 0.1725 0.1107 0.9067 ] def
  currentdict end
]
/ColorSpace defineresource pop

/DefaultCMYK
[ /CIEBasedDEFG
  4 dict begin
     /WhitePoint [ 0.9505 1.0 1.089 ] def
     /Table [ 2 2 2 2
            % Trivial table :
            % [
            %   [ < FFFFFF 000000 FFFF00 000000>
            %     < FF00FF 000000 FF0000 000000> ]
            %   [ < 00FFFF 000000 00FF00 000000>
            %     < 0000FF 000000 000000 000000> ]
            % ]

            % AcrobatReader-compatible table :
              [
                [ < FFFFFF 000000 FFFF00 000000>
                  < EA007F 000000 FC000F 000000> ]

                [ < 00A0C8 000000 008436 000000>
                  < 00007C 000000 000000 000000> ]
              ]
            ] def
     /DecodeLMN [ { 1.8 exp } { 1.8 exp } { 1.8 exp } ] def
     /MatrixLMN [ 0.4439 0.2522 0.0436 0.3341 0.6371 0.1387 0.1725 0.1107 0.9067 ] def
  currentdict end
]
/ColorSpace defineresource pop


% ------ DeviceN color space ------ %

% This isn't quite right, because the ColorSpaceFamily resource will exist
% even with languagelevel < 3, but it's close enough.

/.setdevicenspace where {
  pop colorspacedict /DeviceN {
    dup 2 get setcolorspace dup
    dup 1 get length		% # of components
    .converttinttransform .setdevicenspace
  } bind put
} if

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

% 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