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% Copyright (C) 1996, 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: viewpcx.ps,v 1.5 2002/06/02 12:03:28 mpsuzuki Exp $
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% viewpcx.ps
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% Display a PCX 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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% ****NOTE: does not handle multi-plane images with palette.
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/pcxbytes [
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64 string exch 0 1 63 {
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3 copy exch put pop
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} for pop
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} for
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] readonly def
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/readpcx { % - readpcx <str>
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f % gets replaced
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dup read not {
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pop ()
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} {
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dup 192 lt {
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( ) dup 0 4 -1 roll put exch pop
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} {
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192 sub //pcxbytes 3 -1 roll read pop get exch 0 exch getinterval
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} ifelse
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} ifelse
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} def
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/get2 % <string> <index> get2 <int>
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{ 2 copy get 3 1 roll 1 add get 8 bitshift add
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} bind def
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/dsproc
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{ df s readstring pop % s gets filled in
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s1 () ne { df s1 readstring pop pop } if % discard padding bytes
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} def % don't bind, must be writable
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/viewpcx % <filename> viewpcx -
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{ 100 dict begin
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/fname 1 index def
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/f exch (r) file def
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% Read and unpack the header.
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/header f 128 string readstring pop def
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/version header 1 get def
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/bpp header 3 get def
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/w header 8 get2 header 4 get2 sub 1 add def
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/h header 10 get2 header 6 get2 sub 1 add def
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/nplanes header 65 get def
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/bpl header 66 get2 def
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/palinfo header 68 get2 def
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/nbits bpp nplanes mul def
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version 5 eq
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{ nbits 8 le
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{ /cspace
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[/Indexed /DeviceRGB 1 bpp bitshift 1 sub
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f fileposition
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1 nbits bitshift 3 mul string
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fname status pop pop pop exch pop
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1 index length sub f exch setfileposition
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f exch readstring pop
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exch f exch setfileposition
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] def
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/decode [0 cspace 2 get] def
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}
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{ /cspace /DeviceRGB def
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/decode [0 1 0 1 0 1] def
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}
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ifelse
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}
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{ /cspace
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[/Indexed /DeviceRGB 1 bpp bitshift 1 sub
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header 16 1 nbits bitshift 16 .min 3 mul getinterval
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] def
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/decode [0 cspace 2 get] def
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}
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ifelse
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% Set up scaling.
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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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w 1 0 dtransform add abs div SCALE mul
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h 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 h w gt { w mul h div exch } { h mul w div } ifelse
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}
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ifelse scale
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% Since the number of bytes per line is always even,
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% it may not match the width specification.
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/wbpl w bpp mul 7 add 8 idiv def
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% Define the data source procedure.
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/s1 bpl wbpl sub string def
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/df /readpcx load copyarray dup 0 f put cvx bind readonly
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/dsource [ nplanes
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{ /dsproc load copyarray
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dup 1 wbpl string put
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cvx bind readonly
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}
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repeat ] def
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% Construct the image dictionary.
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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 bpp def
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/Decode decode def
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/DataSource dsource dup length 1 gt
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{ /MultipleDataSources true def }
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{ 0 get }
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ifelse def
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currentdict end
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% Finally, display the image.
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cspace setcolorspace
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image
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showpage
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df closefile
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f closefile
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end
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} bind 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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{ ] { viewpcx } forall
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}
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{ cleartomark
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(Usage: gs -- viewpcx.ps filename.pcx ...\n) print
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( e.g.: gs -- viewpcx.ps my.pcx another.pcx\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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