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- % Copyright (C) 1996 Aladdin Enterprises. All rights reserved.
- %
- % This file is part of Ghostscript.
- %
- % Ghostscript is distributed in the hope that it will be useful, but
- % WITHOUT ANY WARRANTY. No author or distributor accepts responsibility
- % to anyone for the consequences of using it or for whether it serves any
- % particular purpose or works at all, unless he says so in writing. Refer
- % to the Ghostscript General Public License for full details.
- %
- % Everyone is granted permission to copy, modify and redistribute
- % Ghostscript, but only under the conditions described in the Ghostscript
- % General Public License. A copy of this license is supposed to have been
- % given to you along with Ghostscript so you can know your rights and
- % responsibilities. It should be in a file named COPYING. Among other
- % things, the copyright notice and this notice must be preserved on all
- % copies.
-
- % viewpcx.ps
- % Display a PCX 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.
- % ****NOTE: Requires RLE compression; does not handle multi-plane
- % ****images with palette.
-
- /get2 % <string> <index> get2 <int>
- { 2 copy get 3 1 roll 1 add get 8 bitshift add
- } bind def
- /dsproc
- { df s readstring pop % s gets filled in
- s1 () ne { df s1 readstring pop pop } if % discard padding bytes
- } def % don't bind, must be writable
- /viewpcx % <filename> viewpcx -
- { 100 dict begin
- /fname 1 index def
- /f exch (r) file def
- % Read and unpack the header.
- /header f 128 string readstring pop def
- /version header 1 get def
- /bpp header 3 get def
- /w header 8 get2 header 4 get2 sub 1 add def
- /h header 10 get2 header 6 get2 sub 1 add def
- /nplanes header 65 get def
- /bpl header 66 get2 def
- /palinfo header 68 get2 def
- /nbits bpp nplanes mul def
- version 5 eq
- { nbits 8 le
- { /cspace
- [/Indexed /DeviceRGB 1 bpp bitshift 1 sub
- f fileposition
- 1 nbits bitshift 3 mul string
- fname status pop pop pop exch pop
- 1 index length sub f exch setfileposition
- f exch readstring pop
- exch f exch setfileposition
- ] def
- /decode [0 cspace 2 get] def
- }
- { /cspace /DeviceRGB def
- /decode [0 1 0 1 0 1] def
- }
- ifelse
- }
- { /cspace
- [/Indexed /DeviceRGB 1 bpp bitshift 1 sub
- header 16 1 nbits bitshift 16 min 3 mul getinterval
- ] def
- /decode [0 cspace 2 get] def
- }
- ifelse
- % Set up scaling.
- /SCALE where
- { pop
- % Map pixels SCALE-for-1. Assume orthogonal transformation.
- w 1 0 dtransform add abs div SCALE mul
- h 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 h w gt { w mul h div exch } { h mul w div } ifelse
- }
- ifelse scale
- % Since the number of bytes per line is always even,
- % it may not match the width specification.
- /wbpl w bpp mul 7 add 8 idiv def
- % Define the data source procedure.
- /s1 bpl wbpl sub string def
- /df f /PCXDecode filter def
- /dsource [ nplanes
- { /dsproc load copyarray
- dup 1 wbpl string put
- cvx bind readonly
- }
- repeat ] def
- % Construct the image dictionary.
- 20 dict begin % image dictionary
- /ImageType 1 def
- /Width w def
- /Height h def
- /ImageMatrix [w 0 0 h neg 0 h] def
- /BitsPerComponent bpp def
- /Decode decode def
- /DataSource dsource dup length 1 gt
- { /MultipleDataSources true def }
- { 0 get }
- ifelse def
- currentdict end
- % Finally, display the image.
- cspace setcolorspace
- image
- showpage
- df closefile
- f closefile
- end
- } bind def
-
- % If the program was invoked from the command line, run it now.
- [ shellarguments
- { counttomark 1 ge
- { ] { viewpcx } forall
- }
- { cleartomark
- (Usage: gs -- viewpcx.ps filename.pcx ...\n) print
- ( e.g.: gs -- viewpcx.ps my.pcx another.pcx\n) print flush
- }
- ifelse
- }
- { pop
- }
- ifelse
-