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-% Copyright (C) 1992, 1995, 1996, 1998, 1999 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: viewpbm.ps 6300 2005-12-28 19:56:24Z giles $
-% viewpbm.ps
-% Display a PBM/PGM/PPM file.
-% Requires the Level 2 `image' operator (to handle variable pixel widths).
-% If SCALE is defined, maps input pixels to output pixels with that scale;
-% if SCALE is undefined, scales the image to fit the page.
-
-/s 100 string def
-/readmaxv { % <file> readmaxv -
- 10 string readline pop cvx exec /maxv exch def
-} bind def
-/readrow { % <file> <row> readrow <row>
- 0 1 2 index length 1 sub {
- 1 index exch 3 index token pop put
- } for exch pop
-} bind def
-/read01 { % <file> <count> read01 <byte>
- 0 exch {
- 1 index read pop 48 xor dup 1 le { exch dup add add } { pop } ifelse
- } repeat
-} bind def
-/readrow01 { % <file> <row> readrow01 <row>
- 0 1 w 8 idiv {
- 1 index exch 3 index 8 read01 put
- } for
- wrem 0 ne {
- dup rsize 1 sub wrem read01 8 wrem sub bitshift put
- } if
- exch pop
-} bind def
-/readwh { % <file> readwh <w> <h>
- dup s readline pop % check for comment
- (#) anchorsearch {
- pop pop dup s readline pop
- } if
- cvx exec
-} bind def
-/pbmtypes mark
-% The procedures in this dictionary are called as
-% <file> Pn <w> <h> <readproc>
-/P1 { % ASCII 1-bit white/black
- /bpc 1 def /maxv 1 def /rsize w 7 add 8 idiv def
- /wrem w 8 mod def
- /ncomp 1 def /invert true def /DeviceGray setcolorspace
- readwh
- { readrow01 }
-} bind
-/P2 { % ASCII 8-bit gray
- readwh
- /bpc 8 def 2 index readmaxv /rsize 2 index def
- /ncomp 1 def /invert false def /DeviceGray setcolorspace
- { readrow }
-} bind
-/P3 { % ASCII 8-bit RGB
- readwh
- /bpc 8 def 2 index readmaxv /rsize 2 index 3 mul def
- /ncomp 3 def /invert false def /DeviceRGB setcolorspace
- { readrow }
-} bind
-/P4 { % Binary 1-bit white/black
- readwh
- /bpc 1 def /maxv 1 def /rsize 2 index 7 add 8 idiv def
- /ncomp 1 def /invert true def /DeviceGray setcolorspace
- { readstring pop }
-} bind
-/P5 { % Binary 8-bit gray
- readwh
- /bpc 8 def 2 index readmaxv /rsize 2 index def
- /ncomp 1 def /invert false def /DeviceGray setcolorspace
- { readstring pop }
-} bind
-/P6 { % Binary 8-bit RGB
- readwh
- /bpc 8 def 2 index readmaxv /rsize 2 index 3 mul def
- /ncomp 3 def /invert false def /DeviceRGB setcolorspace
- { readstring pop }
-} bind
-.dicttomark readonly def
-/pbmsetup { % <file> <w> <h> <readproc> runpbm -
- /readproc exch def
- /h exch def
- /w exch def
- /f exch def
- 20 dict begin % image dictionary
- /ImageType 1 def
- /Width w def
- /Height h def
- /ImageMatrix [w 0 0 h neg 0 h] def
- /BitsPerComponent bpc def
- /Decode [ 0 255 maxv div invert { exch } if ncomp 1 sub { 2 copy } repeat ] def
- /DataSource [ f rsize string /readproc load /exec load ] cvx def
- currentdict end
-} def
-/imagescale { % <imagedict> imagescale -
- begin
- /SCALE where {
- pop
- % Map pixels SCALE-for-1. Assume orthogonal transformation.
- Width 1 0 dtransform add abs div SCALE mul
- Height 0 1 dtransform add abs div SCALE mul
- } {
- % Scale the image (uniformly) to fit the page.
- clippath pathbbox pop pop translate
- pathbbox .min exch pop exch pop ceiling
- dup Height Width gt {
- Width mul Height div exch
- } {
- Height mul Width div
- } ifelse
- }
- ifelse scale
- end
-} def
-
-% Image a PBM file page by page.
-/viewpbm { % <filename> viewpbm -
- 20 dict begin
- (r) file /pf exch def {
- pf token not { exit } if
- pbmtypes exch get pf exch exec pbmsetup
- dup imagescale image showpage
- } loop
- end
-} def
-
-% Reassemble a composite PBM file from the CMYK separations.
-/viewpsm {
- 20 dict begin
- /fname exch def
- /sources [ 0 1 3 {
- /plane exch def
- /pf fname (r) file def
- pf pbmtypes pf token pop get exec
- % Stack: pf w h readproc
- plane {
- /readproc exch def /h exch def /w exch def pop
- /row rsize string def
- h { pf row readproc pop } repeat
- pf pbmtypes pf token pop get exec
- } repeat
- pbmsetup
- } for ] def
- /datas [ sources { /DataSource get 0 get } forall ] def
- /decode sources 0 get /Decode get
- dup 0 get exch 1 get add cvi 0 exch
- 2 copy 4 copy 8 array astore def
- sources 0 get
- dup /MultipleDataSources true put
- dup /DataSource datas put
- dup /Decode decode put
- /DeviceCMYK setcolorspace
- dup imagescale image showpage
- end
-} def
-
-% If the program was invoked from the command line, run it now.
-[ shellarguments
- { counttomark 1 ge
- { ] { viewpbm } forall
- }
- { cleartomark
- (Usage: gs [--] viewpbm.ps filename.p*m ...\n) print
- ( e.g.: gs [--] viewpbm.ps my.ppm another.ppm\n) print flush
- }
- ifelse
- }
- { pop
- }
-ifelse