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% Copyright (C) 1992, 1995, 1996, 1998, 1999 Aladdin Enterprises. All rights reserved.
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%
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% This software is provided AS-IS with no warranty, either express or
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% implied.
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%
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% This software is distributed under license and may not be copied,
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% modified or distributed except as expressly authorized under the terms
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% of the license contained in the file LICENSE in this distribution.
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%
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% For more information about licensing, please refer to
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% http://www.ghostscript.com/licensing/. For information on
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% commercial licensing, go to http://www.artifex.com/licensing/ or
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% contact Artifex Software, Inc., 101 Lucas Valley Road #110,
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% San Rafael, CA 94903, U.S.A., +1(415)492-9861.
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% $Id: viewpbm.ps,v 1.5 2002/06/02 12:03:28 mpsuzuki Exp $
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% viewpbm.ps
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% Display a PBM/PGM/PPM file.
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% Requires the Level 2 `image' operator (to handle variable pixel widths).
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% If SCALE is defined, maps input pixels to output pixels with that scale;
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% if SCALE is undefined, scales the image to fit the page.
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/s 100 string def
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/readmaxv { % <file> readmaxv -
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10 string readline pop cvx exec /maxv exch def
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} bind def
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/readrow { % <file> <row> readrow <row>
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1 index exch 3 index token pop put
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} for exch pop
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} bind def
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/read01 { % <file> <count> read01 <byte>
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1 index read pop 48 xor dup 1 le { exch dup add add } { pop } ifelse
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} repeat
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} bind def
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/readrow01 { % <file> <row> readrow01 <row>
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1 index exch 3 index 8 read01 put
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} for
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wrem 0 ne {
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dup rsize 1 sub wrem read01 8 wrem sub bitshift put
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} if
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exch pop
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} bind def
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/readwh { % <file> readwh <w> <h>
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dup s readline pop % check for comment
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(#) anchorsearch {
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pop pop dup s readline pop
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} if
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cvx exec
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} bind def
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/pbmtypes mark
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% The procedures in this dictionary are called as
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% <file> Pn <w> <h> <readproc>
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/P1 { % ASCII 1-bit white/black
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/bpc 1 def /maxv 1 def /rsize w 7 add 8 idiv def
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/wrem w 8 mod def
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/ncomp 1 def /invert true def /DeviceGray setcolorspace
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readwh
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{ readrow01 }
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} bind
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/P2 { % ASCII 8-bit gray
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readwh
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/bpc 8 def 2 index readmaxv /rsize 2 index def
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/ncomp 1 def /invert false def /DeviceGray setcolorspace
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{ readrow }
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} bind
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/P3 { % ASCII 8-bit RGB
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readwh
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/bpc 8 def 2 index readmaxv /rsize 2 index 3 mul def
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/ncomp 3 def /invert false def /DeviceRGB setcolorspace
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{ readrow }
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} bind
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/P4 { % Binary 1-bit white/black
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readwh
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/bpc 1 def /maxv 1 def /rsize 2 index 7 add 8 idiv def
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/ncomp 1 def /invert true def /DeviceGray setcolorspace
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{ readstring pop }
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} bind
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/P5 { % Binary 8-bit gray
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readwh
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/bpc 8 def 2 index readmaxv /rsize 2 index def
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/ncomp 1 def /invert false def /DeviceGray setcolorspace
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{ readstring pop }
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} bind
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/P6 { % Binary 8-bit RGB
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readwh
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/bpc 8 def 2 index readmaxv /rsize 2 index 3 mul def
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/ncomp 3 def /invert false def /DeviceRGB setcolorspace
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{ readstring pop }
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} bind
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.dicttomark readonly def
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/pbmsetup { % <file> <w> <h> <readproc> runpbm -
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/readproc exch def
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/h exch def
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/w exch def
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/f exch def
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20 dict begin % image dictionary
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/ImageType 1 def
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/Width w def
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/Height h def
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/ImageMatrix [w 0 0 h neg 0 h] def
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/BitsPerComponent bpc def
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/Decode [ 0 255 maxv div invert { exch } if ncomp 1 sub { 2 copy } repeat ] def
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/DataSource [ f rsize string /readproc load /exec load ] cvx def
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currentdict end
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} def
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/imagescale { % <imagedict> imagescale -
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begin
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/SCALE where {
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pop
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% Map pixels SCALE-for-1. Assume orthogonal transformation.
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Width 1 0 dtransform add abs div SCALE mul
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Height 0 1 dtransform add abs div SCALE mul
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} {
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% Scale the image (uniformly) to fit the page.
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clippath pathbbox pop pop translate
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pathbbox .min exch pop exch pop ceiling
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dup Height Width gt {
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Width mul Height div exch
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} {
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Height mul Width div
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} ifelse
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}
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ifelse scale
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end
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} def
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% Image a PBM file page by page.
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/viewpbm { % <filename> viewpbm -
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20 dict begin
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(r) file /pf exch def {
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pf token not { exit } if
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pbmtypes exch get pf exch exec pbmsetup
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dup imagescale image showpage
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} loop
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end
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} def
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% Reassemble a composite PBM file from the CMYK separations.
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/viewpsm {
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20 dict begin
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/fname exch def
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/sources [ 0 1 3 {
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/plane exch def
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/pf fname (r) file def
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pf pbmtypes pf token pop get exec
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% Stack: pf w h readproc
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plane {
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/readproc exch def /h exch def /w exch def pop
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/row rsize string def
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h { pf row readproc pop } repeat
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pf pbmtypes pf token pop get exec
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} repeat
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pbmsetup
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} for ] def
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/datas [ sources { /DataSource get 0 get } forall ] def
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/decode sources 0 get /Decode get
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dup 0 get exch 1 get add cvi 0 exch
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2 copy 4 copy 8 array astore def
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sources 0 get
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dup /MultipleDataSources true put
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dup /DataSource datas put
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dup /Decode decode put
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/DeviceCMYK setcolorspace
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dup imagescale image showpage
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end
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} def
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% If the program was invoked from the command line, run it now.
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[ shellarguments
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{ counttomark 1 ge
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{ ] { viewpbm } forall
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}
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{ cleartomark
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(Usage: gs [--] viewpbm.ps filename.p*m ...\n) print
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( e.g.: gs [--] viewpbm.ps my.ppm another.ppm\n) print flush
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}
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ifelse
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}
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{ pop
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}
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ifelse
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