185 lines
5.5 KiB
PostScript
185 lines
5.5 KiB
PostScript
% Copyright (C) 1995, 1996 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: gs_l2img.ps,v 1.4 2002/02/21 21:49:28 giles Exp $
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% Emulate the Level 2 dictionary-based image operator in Level 1,
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% except for Interpolate (ignored) and MultipleDataSources = true;
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% also, we require that the data source be either a procedure of a
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% particular form or a stream, not a string or a general procedure.
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% pdf2ps copies the portion of this file from %BEGIN to %END if Level 1
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% compatible output is requested.
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/currentglobal where
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{ pop currentglobal { setglobal } true setglobal }
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{ { } }
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ifelse
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/packedarray where
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{ pop }
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{ /packedarray { array astore readonly } bind def }
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ifelse
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%BEGIN
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11 dict /.csncompdict 1 index def begin
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/DeviceGray { 1 /setgray load } bind def
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/DeviceRGB { 3 /setrgbcolor load } bind def
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/DeviceCMYK { 4 /setcmykcolor load } bind def
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/Indexed
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{ dup 1 index 1 get //.csncompdict exch get exec
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% Stack: [/Indexed base hival map] ncomp basesetcolor
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3 -1 roll 3 get mark 3 1 roll
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% Stack: ncomp -mark- basesetcolor map
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dup type /stringtype eq
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{ { -
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{ exch round cvi get 255 div
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}
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-
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{ exch round cvi 3 mul 2 copy 2 copy get 255 div
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3 1 roll 1 add get 255 div
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4 2 roll 2 add get 255 div
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}
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{ exch round cvi 4 mul 2 copy 2 copy 2 copy get 255 div
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3 1 roll 1 add get 255 div
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4 2 roll 2 add get 255 div
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5 3 roll 3 add get 255 div
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}
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}
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4 index get aload pop counttomark -1 roll
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}
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{ /exec load 3 -1 roll
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% Stack: -mark- mapproc --exec-- basesetcolor
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}
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ifelse .packtomark cvx
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exch pop 1 exch
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} bind def
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/Separation
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{ dup 2 index //.csncompdict exch get exec
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% Stack: [/Separation name alt xform] ncomp altsetcolor
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3 -1 roll 3 get /exec load 3 -1 roll 3 array astore readonly cvx
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exch pop 1 exch
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} bind def
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% Substitute device spaces for CIE spaces.
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/CIEBasedA /DeviceGray load def
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/CIEBasedABC /DeviceRGB load def
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/CIEBasedDEF /DeviceRGB load def
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/CIEBasedDEFG /DeviceCMYK load def
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end
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/.packtomark { counttomark packedarray exch pop } bind def
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/.csinextbits % - .csinextbits <bits>
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% Uses b, nnb, i, row, mask, BitsPerComponent;
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% sets b, nnb, i.
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{ /nnb nnb BitsPerComponent add
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{ dup 0 le { exit } if
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/b b 8 bitshift row i get add def
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/i i 1 add def 8 sub
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}
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loop def
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b nnb bitshift mask and
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} bind def
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% Note that the ColorSpace key must be present in the image dictionary.
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/.colorspaceimage % <imagedict> .colorspaceimage -
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{ save exch
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dup length 15 add dict begin { cvlit def } forall
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ColorSpace dup dup type /nametype ne { 0 get } if
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.csncompdict exch get exec
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/setpixelcolor exch def /ncomp exch def pop
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/row ncomp BitsPerComponent mul Width mul 7 add 8 idiv string def
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/mask 1 BitsPerComponent bitshift 1 sub def
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/nextbits BitsPerComponent 8 eq
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{ { row i get /i i 1 add def } }
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{ /.csinextbits load }
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ifelse def
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/nextpixel mark 0 2 ncomp 1 sub 2 mul
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{ /nextbits cvx exch
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Decode exch 2 getinterval
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dup aload pop exch sub
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dup mask eq { pop } { mask div /mul load 3 -1 roll } ifelse
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0 get dup 0 eq { pop } { /sub load 3 -1 roll } ifelse
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}
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for
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/setpixelcolor load dup type /operatortype ne { /exec load } if
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.packtomark cvx def
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/readrow
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/DataSource load dup type
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dup /arraytype eq exch /packedarraytype eq or
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{ % Must be { <file> <string> ... }
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aload length 1 add array /pop load exch astore
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dup 1 row put cvx
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}
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{ pop
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% Adobe requires readstring to signal an error if given
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% an empty string. Work around this nonsense here.
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row length 0 eq
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{ { } }
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{ { DataSource row readstring pop pop } }
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ifelse
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}
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ifelse def
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ImageMatrix matrix invertmatrix concat
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/imat matrix def
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0 1 Height 1 sub
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{ imat 5 3 -1 roll neg put
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readrow
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/b 0 def /nnb 0 def /i 0 def
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0 1 Width 1 sub
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{ imat 4 3 -1 roll neg put nextpixel
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1 1 true imat {<80>} imagemask
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}
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for
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}
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for
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end restore
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} bind def
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%END
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exec
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currentfile closefile
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% Patch for testing.
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/.cincompdict 3 dict begin
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1 { {0 1} {/DeviceGray} } def
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3 { {0 1 0 1 0 1} {/DeviceRGB} } def
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4 { {0 1 0 1 0 1 0 1} {/DeviceCMYK} } def
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currentdict end def
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/.imagekeys [
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/Decode /DataSource /ImageMatrix /BitsPerComponent /Height /Width
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] def
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/colorimage % <width> <height> <bits/comp> <matrix>
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% <datasrc> false <ncomp> colorimage -
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{ 1 index { /colorimage load /rangecheck signalerror } if exch pop
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//.cincompdict exch get exec
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7 dict begin /ColorSpace exch cvlit def
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.imagekeys { exch cvlit def } forall
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currentdict end .colorspaceimage
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} bind odef
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/image
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{ dup type /dicttype ne
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{ 7 dict begin /ColorSpace /DeviceGray def [0 1]
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.imagekeys { exch cvlit def } forall
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currentdict end
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}
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{ dup length 1 add dict .copydict dup /ColorSpace currentcolorspace put
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}
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ifelse
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.colorspaceimage
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} bind odef
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exec
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