ref: 930efe67e81635e632f1e6f93e1c56499c79a55f
dir: /sys/src/cmd/gs/lib/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,v 1.4 2002/02/21 21:49:28 giles Exp $
% 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 load /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