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gs_epsf.ps
% Copyright (C) 2001-2023 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., 39 Mesa Street, Suite 108A, San Francisco, % CA 94129, USA, for further information. % % Allow the interpreter to encapsulate EPS files, to recognize MS-DOS % EPSF file headers, and skip to the PostScript section of the file. % Encapsulate EPS files and optionally resize page or rescale image. % To display an EPS file cropped to the bounding box: % gs -dEPSCrop file.eps % To display an EPS file scaled to fit the page: % gs -dEPSFitPage file.eps % To display a file without EPS encapsulation: % gs -dNOEPS file.ps % When starting to process an EPS file, state is 0. % After %%BoundingBox processed, state is 1 if OK or 2 if cropped. % After %%HiResBoundingBox processed, state is 3 if OK or 4 if cropped. % After %%EndComments processed, state is 5. /EPSBoundingBoxState 5 def /EPSBoundingBoxString () def % set if either BoundingBox is seen (even if invalid) /EPSBoundingBoxSetState { //systemdict /EPSBoundingBoxState 3 -1 roll .forceput } .bind executeonly odef % .forceput must be bound and hidden % Parse 4 numbers for a bounding box /EPSBoundingBoxParse { % (llx lly urx ury) -- llx lly urx ury true OR false mark exch token {exch token {exch token {exch token {exch pop} if} if} if} if counttomark 4 eq { 5 -1 roll pop % remove mark //true } { cleartomark //false } ifelse } bind executeonly odef % Crop the page to the BoundingBox /EPSBoundingBoxCrop { % llx lly urx ury -- EPSDEBUG { (gs_epsf.ps: Setting pagesize from EPS bounding box\n) print flush } if exch 3 index sub exch 2 index sub % stack: llx lly urx-llx ury-lly << /PageSize [ 5 -2 roll ] >> setpagedevice neg exch neg exch translate } bind executeonly odef % Rescale, translate and rotate to fit the BoundingBox on the page /EPSBoundingBoxFitPage { % llx lly urx ury -- EPSDEBUG { (gs_epsf.ps: Rescaling EPS to fit page\n) print flush } if clippath pathbbox newpath % ellx elly eurx eury pllx plly purx pury EPSDEBUG { (Page Coordinates: LLX: ) print 3 index =print (, LLY: ) print 2 index =print (, URX: ) print 1 index =print (, URY: ) print dup = flush } if % Convert box corners to coordinates of the center and box sizes 2 { % loop doing the page coordinates, the the EPS bbox coordinates 3 -1 roll exch % ... llx urx lly ury 2 { % loop doing Y then X coordnates 2 copy exch sub % ... llx urx lly ury ury-lly 3 1 roll % ... llx urx ury-lly lly ury add 2 div % ... llx urx ury-lly (lly+ury)/2 4 2 roll % ... ury-lly (lly+ury)/2 llx urx } repeat 8 4 roll } repeat % edx, edy = EPS dimension X and Y, ecx, ecy = EPS Center X and Y. % pdx and pcx, etc, are for the Page values. % edx ecx edy ecy pdx pcx pdy pcy % Move the origin to the center of the printable area. 3 -1 roll exch % edx ecx edy ecy pdx pdy pcx pcy translate % edx ecx edy ecy pdx pdy % Find orientation of the best fit. Square pages or files don't rotate. 2 copy sub % edx ecx edy ecy pdx pdy pdx-pdy EPSDEBUG { (pdx: ) print 2 index =print (, pdy: ) print 1 index =print (, pdx-pdy: ) print dup = flush } if 6 index 5 index sub EPSDEBUG { (edx: ) print 7 index =print (, edy: ) print 5 index =print (, edx-edy: ) print dup = flush } if mul % edx ecx edy ecy pdx pdy (pdx-pdy)*(edx-edy) EPSDEBUG { (product: ) print dup = flush } if 0 lt { 90 rotate exch } if % Scale to fit in the most restricting direction. 4 -1 roll div % edx ecx ecy pdx pdy/edy exch 5 -1 roll div % ecx ecy pdy/edy pdx/edx //.min exec dup scale % ecx ecy % Center the document neg exch neg exch translate } bind executeonly odef /EPSBoundingBoxProcess { % (llx lly urx ury) state -- % The following 'lt' check prioritzies HiResBoundingBox over BoundingBox % even if HiResBoundingBox occurs first in the EPS file. //systemdict /EPSBoundingBoxState get 1 index lt { % save the BBoxString for possible FitPage when EndComments is seen exch dup currentglobal //true setglobal exch dup length string copy //systemdict /EPSBoundingBoxString 3 -1 roll .forceput setglobal EPSBoundingBoxParse { //systemdict /EPSCrop known { EPSBoundingBoxCrop } { //systemdict /EPSFitPage known not { % Warn if some of the EPS file will be clipped clippath pathbbox newpath { % context for exit 5 -1 roll lt { 6 { pop } repeat //true exit } if 4 -1 roll lt { 4 { pop } repeat //true exit } if 3 -1 roll gt { 2 { pop } repeat //true exit } if exch gt { //true exit } if //false exit } loop QUIET not and /EPSBoundingBoxState .systemvar 1 and 1 eq and { (\n **** Warning: Some of the BoundingBox for the EPS file will be clipped.) = ( Use -dEPSCrop or -dEPSFitPage to avoid clipping.\n) = flush 1 add } if } { pop pop pop pop } ifelse } ifelse EPSBoundingBoxSetState } { % improperly formed BoundingBox string. QUIET not { (\n **** Warning: BoundingBox values are invalid and will be ignored: ') print EPSBoundBoxString print (') = flush } if pop % state } ifelse } { pop pop } ifelse } bind executeonly odef % Perform anchorsearch on the strings in the array until a match is found. /anchorsearchforany { % haystack [needle1 ...] --> post needle true % --> haystack false false 3 1 roll % false haystack [...] { % false haystack needle dup 3 1 roll % false needle haystack needle anchorsearch { % false needle post needle pop % false needle post 3 1 roll % post false needle exch not exch % post true needle exit } { % false needle haystack exch pop % false haystack } ifelse } forall exch % haystack false | post needle true } bind def /ProcessEPSComment { % file comment -- file comment /EPSBoundingBoxState .systemvar 3 lt { dup (%%BoundingBox:) anchorsearch { pop EPSDEBUG { (gs_epsf.ps: found %%BoundingBox\n) print flush } if 1 EPSBoundingBoxProcess } { (%%HiResBoundingBox:) anchorsearch { pop EPSDEBUG { (gs_epsf.ps: found %%HiResBoundingBox\n) print flush } if 3 EPSBoundingBoxProcess } { pop % Not interested in this DSC comment } ifelse } ifelse } if /EPSBoundingBoxState .systemvar 5 lt { dup (%%DocumentCustomColors:) anchorsearch { pop [ exch { { token not { exit } if dup type /stringtype ne { stop } if dup (atend) eq { stop } if exch } loop { counttomark 2 add index dup (123) .peekstring not { stop } if (%%+) eq { dup (123) readstring pop pop 256 string readline pop cvx exec } { pop exit } ifelse } loop } stopped { cleartomark } { counttomark 0 gt { currentpagedevice /MaxSeparations get 4 gt { ] << /SeparationColorNames 3 -1 roll >> setpagedevice } { cleartomark } ifelse } { cleartomark } ifelse } ifelse } { {(%%EndComments) (%%BeginProlog) (%%BeginSetup)} anchorsearchforany { EPSDEBUG { (EPSComment processing finished, encountered: ) print dup = } if pop pop % discard the strings from the anchorsearch % We may have seen BoundingBox or HiResBounfingBox. If so and if EPSFitPage % is set, then we do the transformation here to scale and center the page, % rotating if needed (and AllowFitPageRotation is true -- the default.) //systemdict /EPSFitPage known //systemdict /EPSBoundingBoxState get 0 gt and { EPSBoundingBoxString EPSBoundingBoxParse { EPSBoundingBoxFitPage } if } if % Ignore any following comments 5 EPSBoundingBoxSetState } { pop % Not %%EndComments -- ignore it } ifelse } ifelse } if } bind executeonly def % Install EPS handler for DSC comments, which we do later /EPSBoundingBoxInit { systemdict /NOEPS known not { % Merge ProcessEPSComment with existing handler //ProcessEPSComment /exec load currentuserparams /ProcessDSCComment get dup //null eq {pop {pop pop}} if /exec load 4 array astore cvx readonly << /ProcessDSCComment 3 -1 roll >> setuserparams } if } bind executeonly odef /.runNoEPS /run load def /.runEPS { % file OR string -- .updatematrices /runEPS_save save def /runEPS_dict_count countdictstack def /runEPS_op_count count 2 sub def /runEPS_page_count .currentshowpagecount not {0} if def 0 EPSBoundingBoxSetState //.runNoEPS .currentshowpagecount not {0} if runEPS_page_count sub 0 eq { /showpage load exec } if count runEPS_op_count sub {pop} repeat countdictstack runEPS_dict_count sub {end} repeat runEPS_save restore } bind executeonly odef /run { % file OR string -- dup type /filetype ne { (r) file } if dup (%!PS-Adobe-) .peekstring { (%!PS-Adobe-) eq { dup (%!PS-Adobe-X.X EPSF-X.X) .peekstring { (EPSF) search { pop pop pop EPSDEBUG {(runEPS: Found EPS\n) print flush} if systemdict /NOEPS known { cvx //.runNoEPS } { cvx .runEPS } ifelse } { EPSDEBUG {(runEPS: Normal DSC\n) print flush} if pop cvx //.runNoEPS } ifelse } { EPSDEBUG {(runEPS: Short DSC\n) print flush} if pop cvx //.runNoEPS } ifelse } { EPSDEBUG {(runEPS: Not DSC\n) print flush} if cvx //.runNoEPS } ifelse } { EPSDEBUG {(runEPS: Short non-DSC\n) print flush} if pop cvx //.runNoEPS } ifelse } bind odef % Handle DOS EPS files. /.runnoepsf /run load def /.epsfheader <C5D0D3C6> def /run { dup type /filetype ne { (r) file } if % Check for MS-DOS EPSF file (see Red Book p. 729). dup ( ) .peekstring { .epsfheader eq { dup ( ) readstring exch pop } { //false } ifelse } { pop //false } ifelse % Stack: file true/false { % This block is executed if the file is MS-DOS EPSF. % Build up the little-endian byte offset and length. 2 { 1 0 4 { 2 index read not { pop exit } if % if EOF, let error happen 2 index mul add exch 256 mul exch } repeat exch pop exch } repeat % Stack: offset length file % Use flushfile to skip quickly to the start of the % PostScript section. dup 4 -1 roll 12 sub () /SubFileDecode filter flushfile % Now interpret the PostScript. exch () /SubFileDecode filter cvx run } { //.runnoepsf } ifelse } odef % rebind .runstdin to use redefined run userdict begin /.runstdin { { (%stdin) run } execute0 } bind def end % undefine things defined in this file and not referenced elsewhere [ /.runNoEPS /.runnoepsf /.runEPS /EPSBoundingBoxSetState /EPSBoundingBoxString /EPSBoundingBoxCrop /EPSBoundingBoxFitPage /EPSBoundingBoxParse /EPSBoundingBoxProcess /ProcessEPSComment ] currentdict .undefinternalnames
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