Edit File: gs_l2img.ps
% Copyright (C) 1995, 1996 Aladdin Enterprises. 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. % % For more information about licensing, please refer to % http://www.ghostscript.com/licensing/. For information on % commercial licensing, go to http://www.artifex.com/licensing/ or % contact Artifex Software, Inc., 101 Lucas Valley Road #110, % San Rafael, CA 94903, U.S.A., +1(415)492-9861. % $Id: gs_l2img.ps 8954 2008-08-08 04:22:38Z ray $ % Emulate the Level 2 dictionary-based image operator in Level 1, % except for Interpolate (ignored) and MultipleDataSources = true; % also, we require that the data source be either a procedure of a % particular form or a stream, not a string or a general procedure. % pdf2ps copies the portion of this file from %BEGIN to %END if Level 1 % compatible output is requested. /currentglobal where { pop currentglobal { setglobal } true setglobal } { { } } ifelse /packedarray where { pop } { /packedarray { array astore readonly } bind def } ifelse %BEGIN 11 dict /.csncompdict 1 index def begin /DeviceGray { 1 /setgray load } bind def /DeviceRGB { 3 /setrgbcolor load } bind def /DeviceCMYK { 4 /setcmykcolor load } bind def /Indexed { dup 1 index 1 get //.csncompdict exch get exec % Stack: [/Indexed base hival map] ncomp basesetcolor 3 -1 roll 3 get mark 3 1 roll % Stack: ncomp -mark- basesetcolor map dup type /stringtype eq { { - { exch round cvi get 255 div } - { exch round cvi 3 mul 2 copy 2 copy get 255 div 3 1 roll 1 add get 255 div 4 2 roll 2 add get 255 div } { exch round cvi 4 mul 2 copy 2 copy 2 copy get 255 div 3 1 roll 1 add get 255 div 4 2 roll 2 add get 255 div 5 3 roll 3 add get 255 div } } 4 index get aload pop counttomark -1 roll } { /exec load 3 -1 roll % Stack: -mark- mapproc --exec-- basesetcolor } ifelse .packtomark cvx exch pop 1 exch } bind def /Separation { dup 2 index //.csncompdict exch get exec % Stack: [/Separation name alt xform] ncomp altsetcolor 3 -1 roll 3 get /exec load 3 -1 roll 3 array astore readonly cvx exch pop 1 exch } bind def % Substitute device spaces for CIE spaces. /CIEBasedA /DeviceGray load def /CIEBasedABC /DeviceRGB load def /CIEBasedDEF /DeviceRGB load def /CIEBasedDEFG /DeviceCMYK load def end /.packtomark { counttomark packedarray exch pop } bind def /.csinextbits % - .csinextbits <bits> % Uses b, nnb, i, row, mask, BitsPerComponent; % sets b, nnb, i. { /nnb nnb BitsPerComponent add { dup 0 le { exit } if /b b 8 bitshift row i get add def /i i 1 add def 8 sub } loop def b nnb bitshift mask and } bind def % Note that the ColorSpace key must be present in the image dictionary. /.colorspaceimage % <imagedict> .colorspaceimage - { save exch dup length 15 add dict begin { cvlit def } forall ColorSpace dup dup type /nametype ne { 0 get } if .csncompdict exch get exec /setpixelcolor exch def /ncomp exch def pop /row ncomp BitsPerComponent mul Width mul 7 add 8 idiv string def /mask 1 BitsPerComponent bitshift 1 sub def /nextbits BitsPerComponent 8 eq { { row i get /i i 1 add def } } { /.csinextbits load } ifelse def /nextpixel mark 0 2 ncomp 1 sub 2 mul { /nextbits cvx exch Decode exch 2 getinterval dup aload pop exch sub dup mask eq { pop } { mask div /mul load 3 -1 roll } ifelse 0 get dup 0 eq { pop } { /sub load 3 -1 roll } ifelse } for /setpixelcolor load dup type /operatortype ne { /exec load } if .packtomark cvx def /readrow /DataSource load dup type dup /arraytype eq exch /packedarraytype eq or { % Must be { <file> <string> ... } aload length 1 add array /pop load exch astore dup 1 row put cvx } { pop % Adobe requires readstring to signal an error if given % an empty string. Work around this nonsense here. row length 0 eq { { } } { { DataSource row readstring pop pop } } ifelse } ifelse def ImageMatrix matrix invertmatrix concat /imat matrix def 0 1 Height 1 sub { imat 5 3 -1 roll neg put readrow /b 0 def /nnb 0 def /i 0 def 0 1 Width 1 sub { imat 4 3 -1 roll neg put nextpixel 1 1 true imat {<80>} imagemask } for } for end restore } bind def %END exec currentfile closefile % Patch for testing. /.cincompdict 3 dict begin 1 { {0 1} {/DeviceGray} } def 3 { {0 1 0 1 0 1} {/DeviceRGB} } def 4 { {0 1 0 1 0 1 0 1} {/DeviceCMYK} } def currentdict end def /.imagekeys [ /Decode /DataSource /ImageMatrix /BitsPerComponent /Height /Width ] def /colorimage % <width> <height> <bits/comp> <matrix> % <datasrc> false <ncomp> colorimage - { 1 index { /colorimage .systemvar /rangecheck signalerror } if exch pop //.cincompdict exch get exec 7 dict begin /ColorSpace exch cvlit def .imagekeys { exch cvlit def } forall currentdict end .colorspaceimage } bind odef /image { dup type /dicttype ne { 7 dict begin /ColorSpace /DeviceGray def [0 1] .imagekeys { exch cvlit def } forall currentdict end } { dup length 1 add dict .copydict dup /ColorSpace currentcolorspace put } ifelse .colorspaceimage } bind odef exec
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