ref: aad36c645ab7b9ab376a935ca7aa63b7d303c46f
dir: /sys/src/cmd/gs/lib/ps2epsi.ps/
% Copyright (C) 1990, 2000 Aladdin Enterprises. 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.
%
% For more information about licensing, please refer to
% http://www.ghostscript.com/licensing/. For information on
% commercial licensing, go to http://www.artifex.com/licensing/ or
% contact Artifex Software, Inc., 101 Lucas Valley Road #110,
% San Rafael, CA 94903, U.S.A., +1(415)492-9861.
% $Id: ps2epsi.ps,v 1.10 2003/05/07 16:37:17 ray Exp $
% 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
{ % 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
//systemdict /.setsafe known { .setsafe } if
} 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
} if
} for
% Calculate the bounding box values.
% Note that these must be corrected to produce closed-open intervals.
/llx lm def
/lly devheight bm sub 1 sub def
/urx rm 1 add def
/ury devheight tm sub def
% 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 (%%BoundingBox: ) writestring
epsifile llx write==only epsifile ( ) writestring
epsifile lly write==only epsifile ( ) writestring
epsifile urx write==only epsifile ( ) writestring
epsifile ury write==
% 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