PC World Komputer 1996 February

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Text File | 1994-08-02 | 32.2 KB | 1,090 lines

% Copyright (C) 1989, 1992, 1993, 1994 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. % Initialization file for the interpreter. % When this is run, systemdict is still writable. % Comment lines of the form % %% Replace <n> <file(s)> % indicate places where the next <n> lines should be replaced by % the contents of <file(s)>, when creating a single merged init file. % Check the interpreter revision. NOTE: the interpreter code requires % that the first non-comment token in this file be an integer % that matches the interpreter's revision. 3000 dup revision ne { (gs: Interpreter revision $) print revision 10 string cvs print ($ does not match gs_init.ps revision $) print 10 string cvs print ($.\n) print flush null 1 .quit } if pop % Acquire userdict. currentdict dup 200 .setmaxlength % userdict systemdict begin /userdict exch def % Define true and false. /true 0 0 eq def /false 0 1 eq def % Define dummy local/global operators if needed. systemdict /.setglobal known { true .setglobal } { /.setglobal { pop } def /.currentglobal { false } def /.gcheck { pop false } def } ifelse % Define .languagelevel if needed. systemdict /.languagelevel known not { /.languagelevel 1 def } if % Optionally choose a default paper size other than U.S. letter. % (a4) /PAPERSIZE where { pop pop } { /PAPERSIZE exch def } ifelse % Turn on array packing for the rest of initialization. true setpacking % Acquire the debugging flags. currentdict /DEBUG known /DEBUG exch def /VMDEBUG DEBUG {{print mark systemdict /level2dict known { .currentglobal false .setglobal vmstatus true .setglobal vmstatus 3 -1 roll pop 6 -2 roll pop .setglobal } { vmstatus 3 -1 roll pop } ifelse counttomark { ( ) print ( ) cvs print } repeat pop ( ) print systemdict length ( ) cvs print ( <) print count ( ) cvs print (>\n) print flush }} {{pop }} ifelse def currentdict /DISKFONTS known /DISKFONTS exch def currentdict /ESTACKPRINT known /ESTACKPRINT exch def currentdict /NOBIND known /NOBIND exch def /.bind /bind load def NOBIND { /bind { } def } if currentdict /NOCACHE known /NOCACHE exch def currentdict /NODISPLAY known not /DISPLAYING exch def currentdict /NOPAUSE known /NOPAUSE exch def currentdict /NOPLATFONTS known /NOPLATFONTS exch def currentdict /OSTACKPRINT known /OSTACKPRINT exch def currentdict /OUTPUTFILE known % obsolete { /OutputFile /OUTPUTFILE load def currentdict /OUTPUTFILE undef } if currentdict /QUIET known /QUIET exch def currentdict /SAFER known /SAFER exch def currentdict /WRITESYSTEMDICT known /WRITESYSTEMDICT exch def % Acquire environment variables. currentdict /DEVICE known not { (GS_DEVICE) getenv { /DEVICE exch def } if } if (START) VMDEBUG % Acquire the standard files. /.stdin (%stdin) (r) file def /.stdout (%stdout) (w) file def /.stderr (%stderr) (w) file def % Define a procedure for skipping over an unneeded section of code. % This avoids allocating space for the skipped procedures. /.skipeof % string -> { { dup currentfile =string readline pop eq { exit } if } loop pop } bind def % Define =string, which is used by some PostScript programs even though % it isn't documented anywhere. /=string 128 string def % Print the greeting. /printgreeting { mark product (Ghostscript) search { pop pop pop (This software comes with NO WARRANTY: see the file PUBLIC for details.\n) } { pop } ifelse ( All rights reserved.\n) copyright (\)\n) revisiondate 10000 idiv (/) revisiondate 100 mod (/) revisiondate 100 idiv 100 mod ( \() revision 1000 div ( ) product counttomark { =string cvs print } repeat pop } bind def QUIET not { printgreeting flush } if % Define a special version of def for making operator procedures. /odef {1 index exch .makeoperator def} bind def %**************** BACKWARD COMPATIBILITY /getdeviceprops { null .getdeviceparams } bind odef /.putdeviceprops { null counttomark 1 add 2 roll .putdeviceparams dup type /nametype eq { counttomark 3 add 1 roll cleartomark pop pop /.putdeviceprops load exch signalerror } if } bind odef /.devicenamedict 1 dict dup /OutputDevice dup put def /.devicename { //.devicenamedict .getdeviceparams exch pop exch pop } bind odef % Define predefined procedures substituting for operators, % in alphabetical order. userdict /#copies 1 put /[ /mark load def /] {counttomark array astore exch pop} odef /abs {dup 0 lt {neg} if} odef % .beginpage is an operator in Level 2. /.beginpage { } odef /copypage { 1 .endpage { 1 false .outputpage (>>copypage, press <return> to continue<<\n) .confirm } if .beginpage } odef /setcolorscreen where { pop % not in all Level 1 configurations /currentcolorscreen { .currenthalftone { { 60 exch 0 exch 3 copy 6 copy } % halftone { 3 copy 6 copy } % screen { } % colorscreen } exch get exec } odef } if /currentscreen { .currenthalftone { { 60 exch 0 exch } % halftone { } % screen { 12 3 roll 9 { pop } repeat } % colorscreen } exch get exec } odef /defaultmatrix {currentdevice exch deviceinitialmatrix} odef /.echo /echo load def userdict /.echo.mode true put /echo {dup /.echo.mode exch store .echo} odef /eexec { 55665 .filter_eexecDecode cvx systemdict begin stopped % Only pop systemdict if it is still the top element, % because this is apparently what Adobe interpreters do. currentdict systemdict eq { end } if { stop } if } odef % .endpage is an operator in Level 2. /.endpage { 2 ne } odef % erasepage mustn't use gsave/grestore, because we call it before % the graphics state stack has been fully initialized. /erasepage { /currentcolor where { pop currentcolor currentcolorspace { setcolorspace setcolor } } { /currentcmykcolor where { pop currentcmykcolor { setcmykcolor } } { currentrgbcolor { setrgbcolor } } ifelse } ifelse 1 setgray .fillpage exec } odef /executive { { prompt { (%statementedit) (r) file } stopped { exit } if cvx execute } loop } odef /handleerror {errordict /handleerror get exec} bind def /identmatrix [1.0 0.0 0.0 1.0 0.0 0.0] readonly def /identmatrix { //identmatrix exch copy} odef /initgraphics {initmatrix newpath initclip 1 setlinewidth 0 setlinecap 0 setlinejoin [] 0 setdash 0 setgray 10 setmiterlimit} odef /languagelevel 1 def % gs_lev2.ps may change this /matrix {6 array identmatrix} odef /prompt {flush flushpage (GS) print count 0 ne {(<) print count =only} if (>) print flush} bind def /pstack {0 1 count 3 sub {index ==} for} bind def /putdeviceprops { .putdeviceprops { erasepage } if } odef /quit {/quit load 0 .quit} odef /run {dup type /filetype ne { (r) file } if cvx execute} odef /setdevice { .setdevice { erasepage } if } odef /showpage { 0 .endpage { #copies true .outputpage (>>showpage, press <return> to continue<<\n) .confirm erasepage } if initgraphics .beginpage } odef % Code output by Adobe Illustrator relies on the fact that % `stack' is a procedure, not an operator!!! /stack {0 1 count 3 sub {index =} for} bind def /start { executive } def /stop { true .stop } odef /stopped { false .stopped } odef /store { 1 index where { 3 1 roll put } { def } ifelse } odef % When running in Level 1 mode, this interpreter is supposed to be % compatible with PostScript "version" 54.0 (I think). /version (54.0) def % Define some additional built-in procedures (beyond the ones defined by % the PostScript Language Reference Manual). % Warning: these are not guaranteed to stay the same from one release % to the next! /concatstrings { exch dup length 2 index length add string % str2 str1 new dup dup 4 2 roll copy % str2 new new new1 length 4 -1 roll putinterval } bind def /copyarray { dup length array copy } bind def /copystring { dup length string copy } bind def /.dicttomark % (the Level 2 >> operator) { counttomark 2 idiv dup dict begin { def } repeat pop currentdict end } bind def /finddevice { systemdict /devicedict get exch get } bind def /.growdictlength % get size for growing a dictionary { length 3 mul 2 idiv 1 add } bind def /.growdict % grow a dictionary { dup .growdictlength .setmaxlength } bind def /.growput % put, grow the dictionary if needed { 2 index length 3 index maxlength eq { 3 copy pop known not { 2 index .growdict } if } if put } bind def /.packtomark { counttomark packedarray exch pop } bind def /runlibfile { findlibfile { exch pop run } { /undefinedfilename signalerror } ifelse } bind def /selectdevice { finddevice setdevice } bind def /signalerror % <object> <errorname> signalerror - { errordict exch get exec } bind def % Define the =[only] procedures. Also define =print, % which is used by some PostScript programs even though % it isn't documented anywhere. /write=only { { .writecvs } null .stopped null ne { pop (--nostringval--) writestring } if } bind def /write= { 1 index exch write=only (\n) writestring } bind def /=only { .stdout exch write=only } bind def /= { =only (\n) print } bind def /=print /=only load def % Temporarily define == as = for the sake of runlibfile0. /== /= load def % Define the filter operator. /.filterstring (.filter_01234567890123456789) def /.filterstring1 .filterstring 8 .filterstring length 8 sub getinterval def /filter { //.filterstring exch 0 exch //.filterstring1 cvs length 8 add getinterval cvn load exec } odef % Define procedures for getting and setting the current device resolution. /gsgetdeviceprop { 1 index getdeviceprops { 1 index counttomark 1 add index eq { exit } if pop pop } loop dup mark eq % if true, not found { pop dup /undefined signalerror } { counttomark 1 add 1 roll cleartomark exch pop exch pop } ifelse } bind def /gscurrentresolution { currentdevice /HWResolution gsgetdeviceprop } bind def /gssetresolution { 2 array astore mark exch /HWResolution exch currentdevice copydevice putdeviceprops setdevice } bind def % Define auxiliary procedures needed for the above. /shellarguments % -> shell_arguments true (or) false { /ARGUMENTS where { /ARGUMENTS get dup type /arraytype eq { aload pop /ARGUMENTS null store true } { pop false } ifelse } { false } ifelse } bind def /.confirm {DISPLAYING NOPAUSE not and {% Print a message and wait for the user to type something. % If the user just types a newline, flush it. print flush .echo.mode false echo .stdin dup read {dup (\n) 0 get eq {pop pop} {unread} ifelse} {pop} ifelse echo} {pop} ifelse} bind def % Define the procedure used by the C executive for executing user input, % and also by the run operator. % This is called with a procedure or file on the operand stack. /execute {stopped $error /newerror get and {handleerror} if} odef % Define an execute analogue of runlibfile0. /execute0 { stopped $error /newerror get and { handleerror flush /execute0 cvx 1 .quit } if } bind def % Define the procedure that the C code uses for running files % named on the command line. /.runfile /runlibfile load def % Define a special version of runlibfile that aborts on errors. /runlibfile0 { cvlit dup /.currentfilename exch def { findlibfile not { stop } if } stopped { (Can't find (or open) initialization file ) print .currentfilename == flush /runlibfile0 cvx 1 .quit } if exch pop cvx stopped { (While reading ) print .currentfilename print (:\n) print flush handleerror /runlibfile0 1 .quit } if } bind def % Temporarily substitute it for the real runlibfile. /.runlibfile /runlibfile load def /runlibfile /runlibfile0 load def % Create the error handling machinery. % Define the standard error handlers. % The interpreter has created the ErrorNames array. /.unstoppederrorhandler % <command> <errorname> .unstoppederrorhandler - { % This is the handler that gets used for recursive errors, % or errors outside the scope of a 'stopped'. (Unrecoverable error: ) print dup =only flush ( in ) print 1 index = flush count 2 gt { (Operand stack:\n ) print 2 1 count 3 sub { ( ) print index =only flush } for (\n) print flush } if -1 0 1 //ErrorNames length 1 sub { dup //ErrorNames exch get 3 index eq { not exch pop exit } { pop } ifelse } for exch pop .quit } bind def /.errorhandler % <command> <errorname> .errorhandler - { % Detect an internal 'stopped'. .instopped { null eq { pop pop stop } if } if $error /.inerror get .instopped { pop } { pop true } ifelse { .unstoppederrorhandler } if % detect error recursion $error /globalmode .currentglobal false .setglobal put $error /.inerror true put $error /newerror true put $error exch /errorname exch put $error exch /command exch put $error /recordstacks get $error /errorname get /VMerror ne and { % Attempt to store the stack contents atomically. count array astore dup $error /ostack 4 -1 roll countexecstack array execstack $error /estack 3 -1 roll countdictstack array dictstack $error /dstack 3 -1 roll put put put aload pop } { $error /dstack undef $error /estack undef $error /ostack undef } ifelse $error /position currentfile status { currentfile { fileposition } null .stopped null ne { pop null } if } { null } ifelse put % During initialization, we don't reset the allocation % mode on errors. $error /globalmode get $error /.nosetlocal get and .setglobal $error /.inerror false put stop } bind def % Define the standard handleerror. We break out the printing procedure % (.printerror) so that it can be extended for binary output % if the Level 2 facilities are present. /.printerror { (Error: ) print $error begin errorname ==only flush ( in ) print /command load ==only flush currentdict /errorinfo .knownget { (\nAdditional information: ) print ==only flush } if % Push the (anonymous) stack printing procedure. % <heading> <==flag> <override-name> <stackname> proc { currentdict exch .knownget % stackname defined in errordict? { 4 1 roll % stack: <stack> <head> <==flag> <over> currentdict exch .knownget % overridename defined? { exch pop exch pop exec } % call override with <stack> { exch print exch % print heading. stack <==flag> <stack> { ( ) print dup type /dicttype eq { (--dict:) print dup length =only (/) print maxlength =only (--) print } { dup type /stringtype eq 2 index or { ==only } { =only } ifelse } ifelse } forall pop } ifelse % overridden } { pop pop pop } ifelse % stack known } (\nOperand stack:\n ) OSTACKPRINT /.printostack /ostack 4 index exec (\nExecution stack:\n ) ESTACKPRINT /.printestack /estack 4 index exec (\nBacktrace:\n ) true /.printbacktrace /backtrace 4 index exec (\nDictionary stack:\n ) true /.printdstack /dstack 4 index exec (\n) print pop % printing procedure errorname /VMerror eq { (VM status:) print mark vmstatus counttomark { ( ) print counttomark -1 roll dup =only } repeat cleartomark (\n) print } if .languagelevel 2 ge { (Current allocation mode is ) print globalmode { (global\n) } { (local\n) } ifelse print } if .oserrno dup 0 ne { (Last OS error: ) print errorname /VMerror ne { dup .oserrorstring { = pop } { = } ifelse } { = } ifelse } { pop } ifelse position null ne { (Current file position is ) print position = } if .clearerror end flush } bind def % Define a procedure for clearing the error indication. /.clearerror { $error /newerror false put $error /errorinfo undef 0 .setoserrno } bind def % Define $error. This must be in local VM. .currentglobal false .setglobal /$error 40 dict def % newerror, errorname, command, errorinfo, % ostack, estack, dstack, recordstacks, % binary, globalmode, % .inerror, .nosetlocal, position, % plus extra space for badly designed error handers. $error begin /newerror false def /recordstacks true def /binary false def /globalmode .currentglobal def /.inerror false def /.nosetlocal true def /position null def end % Define errordict similarly. It has one entry per error name, % plus handleerror. /errordict ErrorNames length 1 add dict def errordict begin ErrorNames { [ 1 index systemdict /.errorhandler get /exec load ] cvx def } forall /handleerror { systemdict /.printerror get exec } bind def end .setglobal % Define the [write]==[only] procedures. /.dict 26 dict dup begin def /.cvp {1 index exch .writecvs} bind def /.nop {exch pop .p} bind def /.p {1 index exch writestring} bind def /.p1 {2 index exch writestring} bind def /.p2 {3 index exch writestring} bind def /.print { dup type .dict exch .knownget { dup type /stringtype eq { .nop } { exec } ifelse } { (-) .p1 type .cvp (-) .p } ifelse } bind def /.pstring { { dup dup 32 lt exch 127 ge or { (\\) .p1 2 copy -6 bitshift 48 add write 2 copy -3 bitshift 7 and 48 add write 7 and 48 add } { dup dup -2 and 40 eq exch 92 eq or {(\\) .p1} if } ifelse 1 index exch write } forall } bind def /booleantype /.cvp load def /conditiontype (-condition-) def /devicetype (-device-) def /dicttype (-dict-) def /filetype (-file-) def /fonttype (-fontID-) def /gstatetype (-gstate-) def /integertype /.cvp load def /locktype (-lock-) def /marktype (-mark-) def /nulltype (-null-) def /realtype /.cvp load def /savetype (-save-) def /nametype {dup xcheck not {(/) .p1} if 1 index exch .writecvs} bind def /arraytype {dup rcheck {() exch dup xcheck {({) .p2 {exch .p1 1 index exch .print pop ( )} forall (})} {([) .p2 {exch .p1 1 index exch .print pop ( )} forall (])} ifelse exch pop .p} {(-array-) .nop} ifelse} bind def /operatortype {(--) .p1 .cvp (--) .p} bind def /packedarraytype { dup rcheck { arraytype } { (-packedarray-) .nop } ifelse } bind def /stringtype { dup rcheck { ($) .p1 dup length 200 le { .pstring } { 0 200 getinterval .pstring (...) .p } ifelse ($) .p } { (-string-) .nop } ifelse } bind def {//.dict begin .print pop end} bind cvx end /write==only exch def /write== {1 index exch write==only (\n) writestring} bind def /==only {.stdout exch write==only} bind def /== {==only (\n) print} bind def (END PROCS) VMDEBUG % Define the font directory. % Make it big to leave room for transformed fonts. /FontDirectory false .setglobal 100 dict true .setglobal def % Define the encoding dictionary. /.encodingdict 5 dict def % leave 1 extra for KanjiSubEncoding % Define findencoding. (This is redefined in Level 2.) /.findencoding { //.encodingdict exch get exec } bind def /.defineencoding { //.encodingdict 3 1 roll put } bind def % Load StandardEncoding. %% Replace 1 (gs_std_e.ps) (gs_std_e.ps) dup runlibfile VMDEBUG % Load ISOLatin1Encoding. %% Replace 1 (gs_iso_e.ps) (gs_iso_e.ps) dup runlibfile VMDEBUG % Define stubs for the Symbol and Dingbats encodings. % Note that the first element of the procedure must be the file name, % since gs_lev2.ps extracts it to set up the Encoding resource category. /SymbolEncoding { /SymbolEncoding .findencoding } bind def %% Replace 3 (gs_sym_e.ps) .encodingdict /SymbolEncoding { (gs_sym_e.ps) systemdict begin runlibfile SymbolEncoding end } bind put /DingbatsEncoding { /DingbatsEncoding .findencoding } bind def %% Replace 3 (gs_dbt_e.ps) .encodingdict /DingbatsEncoding { (gs_dbt_e.ps) systemdict begin runlibfile DingbatsEncoding end } bind put (END FONTDIR/ENCS) VMDEBUG % Construct a dictionary of all available devices. mark % Loop until the .getdevice gets a rangecheck. errordict /rangecheck 2 copy get errordict /rangecheck { pop stop } put % pop the command 0 { {dup .getdevice exch 1 add} loop} stopped pop dict /devicedict exch def devicedict begin % 2nd copy of count is on stack { dup .devicename dup 3 -1 roll def counttomark 1 roll } repeat end put counttomark packedarray /devicenames exch def pop .clearerror (END DEVS) VMDEBUG % Define statusdict, for the benefit of programs % that think they are running on a LaserWriter or similar printer. %% Replace 1 (gs_statd.ps) (gs_statd.ps) runlibfile (END STATD) VMDEBUG % Load the standard font environment. %% Replace 1 (gs_fonts.ps) (gs_fonts.ps) runlibfile (END GS_FONTS) VMDEBUG % Create a null font. This is the initial font. 8 dict dup begin /FontMatrix [ 1 0 0 1 0 0 ] readonly def /FontType 3 def /FontName () def /Encoding StandardEncoding def /FontBBox { 0 0 0 0 } readonly def % executable is bogus, but customary ... /BuildChar { pop pop 0 0 setcharwidth } bind def /PaintType 0 def % shouldn't be needed! end /NullFont exch definefont setfont % Define NullFont as the font, but remove it from FontDirectory. /NullFont currentfont def FontDirectory /NullFont undef (END FONTS) VMDEBUG % Load the initialization files for optional features. %% Replace 4 INITFILES systemdict /INITFILES known { INITFILES { dup runlibfile VMDEBUG } forall } if % If Level 2 functionality is implemented, enable it now. /.setlanguagelevel where { pop 2 .setlanguagelevel } if (END INITFILES) VMDEBUG % Restore the real definition of runlibfile. /runlibfile /.runlibfile load def currentdict /.runlibfile undef % Bind all the operators defined as procedures. /.bindoperators % binds operators in currentdict { % Temporarily disable the typecheck error. errordict /typecheck 2 copy get errordict /typecheck { pop } put % pop the command currentdict { dup type /operatortype eq { % This might be a real operator, so bind might cause a typecheck, % but we've made the error a no-op temporarily. .bind % do a real bind even if NOBIND is set } if pop pop } forall put } def NOBIND not { .bindoperators } if % Establish a default environment. DISPLAYING not { nulldevice (%END DISPLAYING) .skipeof } if /defaultdevice 0 .getdevice systemdict /DEVICE known { pop devicedict DEVICE known not { (Unknown device: ) print DEVICE = flush /defaultdevice cvx 1 .quit } if DEVICE finddevice } if def defaultdevice systemdict /DEVICEWIDTH known systemdict /DEVICEHEIGHT known or systemdict /DEVICEWIDTHPOINTS known or systemdict /DEVICEHEIGHTPOINTS known or systemdict /DEVICEXRESOLUTION known or systemdict /DEVICEYRESOLUTION known or systemdict /PAPERSIZE known or not { (%END DEVICE) .skipeof } if systemdict /PAPERSIZE known { % Convert the paper size to device dimensions. true statusdict /.pagetypenames get { PAPERSIZE eq { PAPERSIZE load dup 0 get /DEVICEWIDTHPOINTS exch def 1 get /DEVICEHEIGHTPOINTS exch def pop false exit } if } forall { (Unknown paper size: ) print PAPERSIZE ==only (.\n) print } if } if % Adjust the device parameters per the command line. getdeviceprops .dicttomark begin 6 dict begin /dw HWSize 0 get def /dh HWSize 1 get def /dmat InitialMatrix def /dxres HWResolution 0 get def /dyres HWResolution 1 get def /DEVICEXRESOLUTION where { pop /drq DEVICEXRESOLUTION dxres div def 0 2 4 { dup dmat exch get drq mul dmat 3 1 roll put } for dw drq mul round cvi /dw exch def /dxres DEVICEXRESOLUTION def } if /DEVICEYRESOLUTION where { pop /drq DEVICEYRESOLUTION dyres div def 1 2 5 { dup dmat exch get drq mul dmat 3 1 roll put } for dh drq mul round cvi /dh exch def /dyres DEVICEYRESOLUTION def } if % Check for device sizes specified in pixels. /DEVICEWIDTH where { pop /dw DEVICEWIDTH def } if /DEVICEHEIGHT where { pop /dh DEVICEHEIGHT def } if % Check for device sizes specified in points. /DEVICEWIDTHPOINTS where { pop /dw DEVICEWIDTHPOINTS dxres mul 72 div round cvi def } if /DEVICEHEIGHTPOINTS where { pop /dh DEVICEHEIGHTPOINTS dyres mul 72 div round cvi def } if mark /HWSize [ dw dh ] /HWResolution [ dxres dyres ] %/InitialMatrix dmat defaultdevice putdeviceprops end end %END DEVICE % Set any device properties defined on the command line. dup getdeviceprops counttomark 2 idiv { systemdict 2 index known { pop dup load counttomark 2 roll } { pop pop } ifelse } repeat systemdict /BufferSpace known systemdict /MaxBitmap known not and { /MaxBitmap BufferSpace } if counttomark dup 0 ne { 2 add -1 roll putdeviceprops } { pop pop } ifelse setdevice % does an erasepage %END DISPLAYING (END DEVICE) VMDEBUG % Establish a default upper limit in the character cache, % namely, enough room for a 1/4" x 1/4" character at the resolution % of the default device, or for 5 x the "average" character size, % whichever is larger. mark % Compute limit based on character size. 18 18 dtransform % 1/4" x 1/4" exch abs cvi 31 add 32 idiv 4 mul % X raster exch abs cvi mul % Y % Compute limit based on allocated space. cachestatus 5 2 roll pop pop pop pop div 5 mul cvi exch pop max dup 10 idiv exch setcacheparams % Conditionally disable the character cache. NOCACHE { 0 setcachelimit } if (END CONFIG) VMDEBUG % Establish an appropriate halftone screen. /.transfermatrix matrix def 72 72 dtransform abs exch abs min % min(|dpi x|,|dpi y|) dup 150 lt systemdict /DITHERPPI known not and { % Low-res device, use ordered dither spot function % The following 'ordered dither' spot function was contributed by % Gregg Townsend. Thanks, Gregg! 16.001 div 0 % not 16: avoids rounding problems { 1 add 7.9999 mul cvi exch 1 add 7.9999 mul cvi 16 mul add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exch get 256 div } bind setscreen { } % transfer true % strokeadjust } { % Hi-res device, use 45 degree dot spot function. % According to information published by Hewlett-Packard, % they use a 60 line screen on 300 DPI printers and % an 85 line screen on 600 DPI printers. % 46 was suggested as a good frequency value for printers % between 200 and 400 DPI, so we use it for lower resolutions. systemdict /DITHERPPI known { DITHERPPI } { dup cvi 100 idiv 6 min {null 46 46 60 60 60 85} exch get } ifelse 1 index 4.01 div min % at least a 4x4 cell 45 % The following screen algorithm is used by permission of the author. { 1 add 180 mul cos 1 0.08 add mul exch 2 add 180 mul cos 1 0.08 sub mul add 2 div % (C) 1989 Berthold K.P. Horn } bind % Ghostscript currently doesn't use correct, per-plane halftones % unless setcolorscreen has been executed. Since these are % computationally much more expensive than binary halftones, % we check to make sure they are really warranted, i.e., we have % a high-resolution CMYK device (i.e., not a display) with % fewer than 5 bits per plane (i.e., not a true-color device). 4 -1 roll 150 ge { /setcolorscreen where { pop defaultdevice getdeviceprops .dicttomark dup dup dup /RedValues known exch /GreenValues known and exch /BlueValues known and { dup dup /RedValues get 32 lt exch /GreenValues get 32 lt and exch /BlueValues get 32 lt and { 3 copy 6 copy setcolorscreen } { setscreen } ifelse } { pop setscreen } ifelse } { setscreen } ifelse } { setscreen } ifelse % Set the transfer function to lighten up the grays. % We correct at the high end so that very light grays % don't disappear completely if they darken <1 screen pixel. % Parameter values closer to 1 are better for devices with % less dot spreading; lower values are better with more spreading. % The value 0.8 is a compromise that will probably please no one! { 0.8 exp dup dup 0.9375 gt exch 0.995 lt and % > 15/16 { currentscreen pop pop 72 exch div dup //.transfermatrix defaultmatrix dtransform cvi exch cvi mul abs % # of pixels in halftone cell 1 sub % tweak to avoid boundary 1 exch div 1 exch sub min } if } % transfer false % strokeadjust } ifelse /setstrokeadjust where { pop setstrokeadjust } { pop } ifelse settransfer initgraphics % The interpreter relies on there being at least 2 entries % on the graphics stack. Establish the second one now. gsave % Define some control sequences as no-ops. % This is a hack to get around problems % in some common PostScript-generating applications. <04> cvn { } def % Apple job separator <0404> cvn { } def % two of the same <1b> cvn { } def % MS Windows LaserJet 4 prologue <041b> cvn { } def % MS Windows LaserJet 4 epilogue % If we want a "safer" system, disable some obvious ways to cause havoc. SAFER not { (%END SAFER) .skipeof } if /file { dup (r) eq { file } { /invalidfileaccess signalerror } ifelse } bind odef /renamefile { /invalidfileaccess signalerror } odef /deletefile { /invalidfileaccess signalerror } odef /putdeviceprops { counttomark dup 2 mod 0 eq { pop /rangecheck signalerror } if 3 2 3 2 roll { dup index /OutputFile eq { -2 roll dup () ne { /putdeviceprops load /invalidfileaccess signalerror } if 3 -1 roll } { pop } ifelse } for putdeviceprops } bind odef %END SAFER % Turn off array packing, since some PostScript code assumes that % procedures are writable. false setpacking % Close up systemdict. end WRITESYSTEMDICT not { systemdict readonly pop } if (END INIT) VMDEBUG % Establish local VM as the default. false .setglobal $error /.nosetlocal false put % Clean up VM, and enable GC. /vmreclaim where { pop 2 vmreclaim 0 vmreclaim } if (END GC) VMDEBUG % The interpreter will run the initial procedure (start).