| Current File : //usr/share/ghostscript/lib/viewpcx.ps |
% Copyright (C) 2001-2019 Artifex Software, Inc.
% 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.
%
% Refer to licensing information at http://www.artifex.com or contact
% Artifex Software, Inc., 1305 Grant Avenue - Suite 200, Novato,
% CA 94945, U.S.A., +1(415)492-9861, for further information.
%
% 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.
% If FITPAGE is true it fits the output page size to the image, honouring SCALE
% ****NOTE: does not handle multi-plane images with palette.
/pcxbytes [
0 1 255 {
64 string exch 0 1 63 {
3 copy exch put pop
} for pop
} for
] readonly def
/readpcx { % - readpcx <str>
f % gets replaced
dup read not {
pop ()
} {
dup 192 lt {
( ) dup 0 4 -1 roll put exch pop
} {
192 sub //pcxbytes 3 -1 roll read pop get exch 0 exch getinterval
} ifelse
} ifelse
} def
/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
/FITPAGE where
{
/FITPAGE get
{
5 dict begin
/SCALE where
{
pop
/Width w SCALE mul def
/Height h SCALE mul def
}
{
/Width w def
/Height h def
} ifelse
% we've already set the image color space, so
% push it on the stack, and set it again after
% setting the page size
<</PageSize [Width Height] >> setpagedevice
end
} if
}
{
/FITPAGE false def
} ifelse
/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
FITPAGE
{
% Map pixels SCALE-for-1. Assume orthogonal transformation.
w SCALE mul
h SCALE mul
}
{
% 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
} ifelse
}
{
FITPAGE
{
w h
}
{
% 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
}
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 /readpcx load copyarray dup 0 f put cvx bind readonly
0 () /SubFileDecode 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