Edit: gs_ll3.ps
% Copyright (C) 2001-2019 Artifex Software, Inc. % 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. % % Refer to licensing information at http://www.artifex.com or contact % Artifex Software, Inc., 1305 Grant Avenue - Suite 200, Novato, % CA 94945, U.S.A., +1(415)492-9861, for further information. % % 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 { //false /IdiomSet //.findcategory exec .Instances { exch pop % pop the IdiomSet identifying key. Stack /proc /false [-dict- status size] 0 get % get resource instance, a dictionary. Stack : /proc false -dict- { exch pop % pop the instance identifying key % Stack: proc //false [template substitute] dup 1 get exch 0 get % Stack: proc //false substitute template 3 index .eqproc { % Stack: proc //false substitute 3 -1 roll pop exch not % Stack: substitute true } { pop % Stack: proc //false } ifelse } forall dup {exit} if % Stack proc <bool> } forall not % Not matched in global resources currentglobal not and % must not match local resources if currentglobal is true { //false .LocalInstances { exch pop % pop IdiomSet identifying key. Stack /proc /false [-dict- status size] 0 get % get resource instance, a dictionary Stack : /proc false -dict- { exch pop % pop instance identifier key % Stack: proc //false [template substitute] dup 1 get exch 0 get % Stack: proc //false substitute template 3 index .eqproc { % Stack: proc //false substitute 2 index gcheck % Stack: proc //false substitute _global?_ 1 index gcheck not and % Stack: proc //false substitute _global?_ _global?_ { % must not match if candidate in global VM and substitute in local pop % Stack: proc //false } { % Stack: proc //false substitute 3 -1 roll pop exch not % Stack: substitute true }ifelse } { pop % Stack: proc //false } ifelse } forall dup {exit} if } forall pop % Stack: proc/substitute } if end % .findcategory makes the category dictionary the current dict, so we must pop it from dict stack } if } def /.bind /.bind_ load odef % note that .bind_ will get bound currentdict /.bindscratch .undef DELAYBIND not { % We can't just do % /bind /.bind load def % because then /bind load == prints --.bind-- . /bind {//.bind_ exec} odef } if currentdict /.bind_ undef /.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 /.bigstring { % <size> .bigstring <string|bytestring> count 1 lt { /.bigstring /stackunderflow signalerror } if dup type /integertype ne { /.bigstring /typecheck signalerror } if dup 65400 gt { .bytestring } { string } ifelse } bind def % ------ 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 exec % Stack: dict dict source str dup type /stringtype eq { readstring } { //.readbytestring exec} 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 /.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 exec } 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 exec } 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 exec } bind def .halftonetypes begin 6 //.sethalftone6 def 10 //.sethalftone10 def 16 //.sethalftone16 def end % Redefine the halftone-setting operators to honor HalftoneMode. /setcolorscreen { /HalftoneMode getuserparam 0 eq { //setcolorscreen } { 12 { pop } repeat //.getdefaulthalftone exec { //sethalftone } { .setdefaulthalftone } ifelse } ifelse } odef /setscreen { /HalftoneMode getuserparam 0 eq { //setscreen } { pop pop pop //.getdefaulthalftone exec { //sethalftone } { .setdefaulthalftone } ifelse } ifelse } odef /sethalftone { /HalftoneMode getuserparam 0 eq { //sethalftone } { gsave //sethalftone grestore //.getdefaulthalftone exec { //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 } { /$error .systemvar /errorinfo [ /ColorSpace //null ] put /shfill .systemvar /undefined signalerror } ifelse } bind def /.buildshading_and_shfill { //.buildshading exec .shfill } bind def systemdict /.reuseparamdict undef /.buildpattern2 { % <template> <matrix> .buildpattern2 % <template> <pattern> % We want to build the pattern without doing gsave/grestore, % since we want it to load the CIE caches. 1 index /Shading get mark currentcolor currentcolorspace counttomark 4 add -3 roll mark 4 1 roll % Stack: -mark- ..color.. cspace -mark- template matrix shadingdict { //.buildshading exec} stopped { cleartomark setcolorspace setcolor pop stop } if .buildshadingpattern 3 -1 roll pop counttomark 1 add 2 roll setcolorspace setcolor pop } bind def .patterntypes 2 //.buildpattern2 put /shfill { % <shadingdict> shfill - % Currently, .shfill requires that the color space % in the pattern be the current color space. % Disable overprintmode for shfill { dup gsave 0 .setoverprintmode .buildshading_and_shfill } stopped grestore { /$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 % read-only, so use .forceput pssystemparams /MaxDisplayAndSourceList 160000 .forceput % 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 (*) { dup type /nametype eq not { cvn } if /IdiomSet findresource pop } 256 string /IdiomSet resourceforall /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 % undefine things defined (or used) in this file and not referenced elsewhere [ /.buildpattern2 /.buildshading /.buildshading1 /.buildshading2 /.buildshading3 /.buildshading4 /.buildshading5 /.buildshading6 /.buildshading7 /.buildshadingpattern /.makehalftone7 /.sethalftone6 /.sethalftone10 /.sethalftone16 /.readbytestring /.bigstring ] dup {currentdict exch .forceundef} forall {systemdict exch .forceundef} forall end % ll3dict
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