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% Copyright (C) 1998 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: viewmiff.ps,v 1.4 2002/02/21 21:49:28 giles Exp $
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% viewmiff.ps
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% Display a MIFF file. You would think the 'display' command would do this,
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% but many versions of 'display' either core-dump or require unacceptably
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% large amounts of memory.
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% Recognize MIFF keywords.
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/miffwords mark
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/class { cvn /class exch def }
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/colors { cvi /colors exch def }
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/columns { cvi /Width exch def }
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/compression { cvn /compression exch def }
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/depth { cvi /depth exch def }
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/packets { cvi /packets exch def }
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/rows { cvi /Height exch def }
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.dicttomark readonly def
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% Recognize MIFF image classes.
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/miffclasses mark
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/DirectClass {
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/DeviceRGB setcolorspace
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/BitsPerComponent depth def
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/Decode [ 0 1 0 1 0 1 ] def
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}
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/PseudoClass {
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[ /Indexed
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% The MIFF documentation lies about the size of pixels
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% for this case: the pixel size is determined only by
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% the number of colors, and is not affected by the image
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% depth. Specifically, if there are 256 or fewer colors
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% but the depth (of color map entries) is 16, each pixel
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% is still only 1 byte, not 2.
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currentdict /colors known {
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/DeviceRGB colors 1 sub
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/BitsPerComponent colors 256 le { 8 } { 16 } ifelse def
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colors 3 mul string depth 8 eq {
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f exch readstring pop
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} {
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% 16-bit color map entries: take only the high-order byte.
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f read pop 2 index 3 1 roll put f read pop pop
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} for
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} ifelse
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} {
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/colors 256 def
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/DeviceGray 255
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256 string 0 1 255 { 1 index exch dup put } for
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} ifelse
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] setcolorspace
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/Decode [ 0 1 BitsPerComponent bitshift 1 sub ] def
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}
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.dicttomark readonly def
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% Recognize MIFF compression methods.
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/rlstring 768 string def
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/rlread {
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% packets is not reliable -- disregard it.
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dup rlstring 0 3 getinterval readstring {
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pop read pop 3 mul 3 3 2 index {
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rlstring exch rlstring 0 3 getinterval putinterval
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} for
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rlstring 0 3 -1 roll 3 add getinterval
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} {
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pop pop ()
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} ifelse
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} bind def
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/miffcompress mark
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/Uncompressed { f }
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/RunLengthEncoded { { f rlread } }
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/Zip { [ f /FlateDecode filter cvlit /rlread cvx ] cvx }
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.dicttomark readonly def
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% Read a MIFF file and display the image.
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/viewmiff { % <filename> viewmiff -
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50 dict begin
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/fname 1 index def
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/f exch (r) file def
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% Set defaults.
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/ImageType 1 def
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/class /DirectClass def
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/compression /Uncompressed def
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/depth 8 def
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/packets 16#7fffffff def
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% Read and parse the header.
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{ f token pop
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dup (:) eq { pop exit } if
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dup type /nametype eq {
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.namestring (=) search {
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exch pop miffwords exch .knownget { exec } { pop } ifelse
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} {
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pop % who knows?
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} ifelse
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} {
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pop % probably a comment in braces
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} ifelse
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} loop
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% Read and display the image.
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miffclasses class get exec
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/DataSource miffcompress compression get exec def
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/ImageMatrix [Width 0 0 Height neg 0 Height] def
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currentpagedevice /PageSize get
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dup 0 get exch 1 get scale
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gsave 0.8 setgray 0 0 1 1 rectfill grestore % provide background
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currentdict image
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showpage
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% Clean up.
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f closefile
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end
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} bind def
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