% Copyright (C) 1997, 2000 Aladdin Enterprises. All rights reserved. % % This program is free software; you can redistribute it and/or modify it % under the terms of the GNU General Public License as published by the % Free Software Foundation; either version 2 of the License, or (at your % option) any later version. % % This program is distributed in the hope that it will be useful, but % WITHOUT ANY WARRANTY; without even the implied warranty of % MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General % Public License for more details. % % You should have received a copy of the GNU General Public License along % with this program; if not, write to the Free Software Foundation, Inc., % 59 Temple Place, Suite 330, Boston, MA, 02111-1307. % $Id: gs_ll3.ps,v 1.10.2.2.2.1 2003/04/12 14:02:38 giles 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 { % bind //.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 { % % ( | null) .makehalftone7 % { .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 { % .bigstring dup 65400 gt { .bytestring } { string } ifelse } bind def /.readbytestring { % .readbytestring % % 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 { % .sethalftone6 % { .sethalftone5 } % Keys: Width, Height, Thresholds, T'Function dup /Thresholds get 1 index /Width get 2 index /Height get null 8 .makehalftone7 } bind def /.sethalftone10 { % .sethalftone10 % { .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 { % .sethalftone16 % { .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 { % .buildshading % 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 { %