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% Copyright (C) 1989, 1992, 1993, 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: viewgif.ps,v 1.5 2003/04/12 18:08:18 ray Exp $
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% viewgif.ps
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% Display a GIF file.
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/read1 % <file> read1 <int>
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{ read pop
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} bind def
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/read2 % <file> read2 <int>
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{ dup read1 exch read1 8 bitshift add
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} bind def
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/readGIFheader % <file> readGIFheader <dict>
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{ 20 dict begin
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dup 6 string readstring pop
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dup (GIF87a) eq exch (GIF89a) eq or not
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{ (Not a GIF file.\n) print cleartomark stop
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} if
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dup read2 /Width exch def
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dup read2 /Height exch def
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dup read1
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dup 128 ge /GlobalColor exch def
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dup -4 bitshift 7 and 1 add /BitsPerPixel exch def %***BOGUS?***
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dup 8 and 0 ne /PaletteSorted exch def
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7 and 1 add dup /BitsPerPixel exch def
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1 exch bitshift /PaletteSize exch def
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dup read1 /BackgroundIndex exch def
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dup read1 15 add 64 div /AspectRatio exch def
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GlobalColor
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{ PaletteSize 3 mul string readstring pop
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/GlobalPalette exch def
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} if
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currentdict end
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} bind def
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/readGIFimageHeader % <file> readGIFimageHeader <dict>
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% Note: GIF header must be on dict stack
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{ 10 dict begin
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{ dup read1
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dup (!) 0 get ne { exit } if pop % extension
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dup read1 pop
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{ dup read1 dup 0 eq { pop exit } if { dup read1 pop } repeat
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} loop
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} loop
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(,) 0 get ne
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{ (Not a GIF image.\n) print stop
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} if
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dup read2 /Left exch def
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dup read2 /Top exch def
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dup read2 /Width exch def
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dup read2 /Height exch def
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dup read1
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dup 128 ge /LocalColor exch def
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dup 64 and 0 ne /Interlaced exch def
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LocalColor
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{ 7 and 1 add /BitsPerPixel exch def
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1 BitsPerPixel bitshift 3 mul string readstring pop
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/Palette exch def
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}
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{ pop pop /Palette GlobalPalette def
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}
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ifelse
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currentdict end
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} bind def
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/imageGIF % <imagedict> imageGIF
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{ /ImageOut where
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{ pop
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% We know BitsPerComponent = 8, Decode = [0 255].
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% and there is only a single data source which is
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% either a filter or a string whose size is exactly
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% the width of the row.
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dup /DataSource get dup type /stringtype eq
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{ ImageOut exch writestring
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}
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{ pop dup /Width get string
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1 index /Height get
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{ 1 index /DataSource get 1 index readstring pop
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ImageOut exch writestring
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}
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repeat pop pop
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}
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ifelse
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}
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{ image
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}
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ifelse
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} bind def
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/viewGIF % <file|string> viewGIF -
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{ save 20 dict begin
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/saved exch def
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dup type /stringtype eq { (r) file } if
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/F exch def
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/ImageOutFile where { /ImageOut ImageOutFile (w) file def } if
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F readGIFheader /Header exch def
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currentdict Header end begin begin
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VGIFDEBUG { Header { exch == == } forall (----------------\n) print flush } if
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F readGIFimageHeader /ImageHeader exch def
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currentdict ImageHeader end begin begin
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VGIFDEBUG { ImageHeader { exch == == } forall (----------------\n) print flush } if
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/D F
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<< /InitialCodeLength F read1
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/FirstBitLowOrder true
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/BlockData true
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/EarlyChange 0
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>> /LZWDecode filter def
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[/Indexed /DeviceRGB 1 BitsPerPixel bitshift 1 sub Palette] setcolorspace
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matrix currentmatrix
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setmatrix
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<< /ImageType 1
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/ImageMatrix [1 0 0 -1 0 Height]
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/BitsPerComponent 8
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/Decode [0 255]
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Interlaced
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{ /Width Width /Height 1
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/row Width string def
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/DataSource row
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>> /I exch def
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/inter % <num> <denom> inter -
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{ /denom exch def /num exch def
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gsave
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/lines Height denom 1 sub add num sub denom idiv def
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Height exch denom mul num add sub
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I /ImageMatrix get 5 3 -1 roll put
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D row readstring pop pop
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I imageGIF
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} for
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grestore
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}
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bind def
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4 8 inter
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2 4 inter
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1 2 inter
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}
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{ /Width Width /Height Height
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/DataSource D
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>> imageGIF
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}
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ifelse
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saved end end end restore
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} bind def
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