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ps2epsi.ps
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% 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. % % Convert an arbitrary PostScript file to an EPSI file. % % Please do not contact these users if you have questions. They no longer % have the time, interest, or current expertise to keep this code working. % If you find bugs, please send proposed fixes to bug-gs@ghostscript.com. % % Bug fix 2002-04-20 by rayjj: Bounding box was incorrect since it depended % on the dither pattern and gray shade at the boundary. Changed to use % 8-bit grayscale preview image to allow correct bounding box (at the % expense of a 8x larger preview image). Also moved .setsafe until after % the device and file operations are complete (but still before the input % file is processed. % Bug fix 2000-04-11 by lpd: if a font didn't have a FontName (which is the % case for bitmap fonts produced by recent versions of dvips), setfont % caused an error. % Bug fix 8/21/99 by lpd: many of the margin and width computations were % wrong (off by 1). The code only "worked" because the bugs were % (mostly) in conservative directions. % Modified 3/17/98 by lpd to make it possible to run this file without % running the ps2epsi script first, for debugging. % Bug fix 9/29/97 by lpd <ghost@aladdin.com>: if the page size wasn't an % exact multiple of 8 bits, an incorrect bounding box (or a rangecheck % error) could occur. % Patched 7/26/95 by % Greg P. Kochanski <gpk@bell-labs.com> % to add many new DSC comments and make the comments conforming. % Original version contributed by % George Cameron <george@bio-medical-physics.aberdeen.ac.uk> % % Initialize, and redefine copypage and showpage. % ps2edict is normally defined in the pre-loaded code created by the % ps2epsi script. /ps2edict where { pop } { /ps2edict 25 dict def } ifelse ps2edict begin % The main procedure /ps2epsi { % bbox written to outfile by bbox device from ps2epsi command file outfile (r) file /epsifile exch def /BBoxString epsifile 256 string readline pop def /HiresBBoxString epsifile 256 string readline pop def epsifile closefile % Open the file outfile (w) file /epsifile exch def % Get the device parameters currentdevice getdeviceprops .dicttomark /HWSize get aload pop /devheight exch def /devwidth exch def matrix defaultmatrix /devmatrix exch def % Make a corresponding 8-bit deep memory device devmatrix devwidth devheight 256 string 0 1 255 { 1 index exch dup 255 exch sub put } for makeimagedevice /arraydevice exch def arraydevice % Turn on anti-aliasing mark /TextAlphaBits 4 /GraphicsAlphaBits 4 6 -1 roll putdeviceprops setdevice % (does an erasepage) /rowwidth devwidth def /row rowwidth string def /zerorow rowwidth string def % all zero % Replace the definition of showpage userdict /showpage { ps2edict begin epsipage end } bind put userdict /setfont { ps2edict begin epsisetfont end } bind put userdict /setpagedevice /pop load put } bind def /epsifontdict 100 dict def /epsisetfont { % code here keeps a list of font names in dictionary epsifontdict /tmpfont exch def tmpfont /FontName known { /tmpfontname tmpfont /FontName get def epsifontdict tmpfontname known not { epsifontdict tmpfontname 0 put } if epsifontdict tmpfontname 2 copy get 1 add put } if tmpfont setfont } bind def % Get a scan line from the memory device, zeroing any bits beyond % the device width. /getscanline { % <device> <y> <string> getscanline <string> dup 4 1 roll copyscanlines pop 16#ff00 devwidth 7 and neg bitshift 255 and dup 0 ne { 1 index dup length 1 sub 2 copy get 4 -1 roll and put } { pop } ifelse } bind def /margintest { % <y-start> <step> <y-limit> margintest <y-non-blank> % <y-start> <step> <y-limit> margintest - { dup arraydevice exch row getscanline zerorow ne { exit } if pop } for } bind def /epsiNameStr 200 string def /epsiNpages 0 def /epsiNpageStr 20 string def /epsipage { /epsiNpages epsiNpages 1 add def /loopcount devheight 1 sub def % Find top margin -- minimum Y of non-blank scan line. -1 0 1 loopcount margintest dup -1 eq { (blank page!!\n) print quit }{ exch pop } ifelse /tm exch def % Find bottom margin -- maximum Y of non-blank scan line. loopcount -1 0 margintest /bm exch def % Initialise limit variables /loopcount rowwidth 1 sub def /lm loopcount def /rm 0 def % Find left and right boundaries of image tm 1 bm { % Get more data arraydevice exch row getscanline pop % Scan from left to find first non-zero element % We save first the element, then the index -1 0 1 loopcount { dup row exch get 0 ne { exch pop exit }{ pop } ifelse } for % If we found -1, row is blank .. dup -1 ne { % Find the leftmost index dup lm lt % If the new index is less, we save index and element { /lm exch def } { pop } ifelse % Now find the rightmost index loopcount -1 0 { dup row exch get 0 ne { exit }{ pop } ifelse } for dup rm gt % If the new index is greater, we save index and element { /rm exch def } { pop } ifelse } { pop } ifelse } for % Write out the magic string and bounding box information epsifile (%!PS-Adobe-2.0 EPSF-1.2\n) writestring /epsititle where { pop epsifile epsititle writestring } if /epsicreator where { pop epsifile epsicreator writestring } if /epsicrdt where { pop epsifile epsicrdt writestring } if /epsifor where { pop epsifile epsifor writestring } if epsifile flushfile % Write out the page count: epsifile (%%Pages: ) writestring epsifile epsiNpages epsiNpageStr cvs writestring epsifile (\n) writestring epsifile flushfile % Write out the list of used fonts: epsifile (%%DocumentFonts:) writestring epsifontdict { epsifile ( ) writestring pop epsiNameStr cvs epsifile exch writestring } forall epsifile (\n) writestring epsifile flushfile epsifile BBoxString writestring epsifile (\n) writestring epsifile HiresBBoxString writestring epsifile (\n) writestring % Define character and bit widths for the output line buffer: /cwidth rm lm sub 1 add def /out cwidth string def epsifile (%%EndComments\n\n) writestring epsifile (%%BeginProlog\n) writestring epsifile (%%BeginPreview: ) writestring epsifile cwidth write==only epsifile ( ) writestring epsifile bm tm sub 1 add write==only epsifile ( 8 ) writestring epsifile bm tm sub 1 add cwidth 39 add 40 idiv mul write== epsifile flushfile gsave tm 1 bm { % Get a scan line interval from the array device arraydevice exch row copyscanlines lm cwidth getinterval % Write out the hex data as 40 bytes per line (82 chars) 0 40 cwidth { epsifile (% ) writestring epsifile exch 2 index exch dup cwidth exch sub 40 .min getinterval writehexstring epsifile (\n) writestring } for pop } for epsifile (%%EndImage\n) writestring epsifile (%%EndPreview\n) writestring epsifile flushfile grestore erasepage initgraphics DonePage 0 1 put } bind def (outfile) getenv { /outfile exch def ps2epsi /DonePage 1 string def (%stdin) (r) file cvx execute0 DonePage 0 get 0 eq { showpage } if } if end quit