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- % Copyright (C) 1995 Aladdin Enterprises. All rights reserved.
- %
- % This file is part of Aladdin Ghostscript.
- %
- % Aladdin Ghostscript is distributed with NO WARRANTY OF ANY KIND. No author
- % or distributor accepts any responsibility for the consequences of using it,
- % or for whether it serves any particular purpose or works at all, unless he
- % or she says so in writing. Refer to the Aladdin Ghostscript Free Public
- % License (the "License") for full details.
- %
- % Every copy of Aladdin Ghostscript must include a copy of the License,
- % normally in a plain ASCII text file named PUBLIC. The License grants you
- % the right to copy, modify and redistribute Aladdin Ghostscript, but only
- % under certain conditions described in the License. Among other things, the
- % License requires that the copyright notice and this notice be preserved on
- % all copies.
-
- % 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.
-
- /currentglobal where
- { pop currentglobal { setglobal } true setglobal }
- { { } }
- ifelse
-
- 7 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
- { 3 index
- { -
- { 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
- }
- }
- exch get aload pop counttomark -1 roll
- }
- { /exec load 3 -1 roll
- % -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 /packedarray where
- { pop { counttomark packedarray exch pop } }
- { { ] readonly } }
- ifelse bind def
-
- /.csinextbits % - .csinextbits <bits>
- % Uses b, nb, i, row, mask, BitsPerComponent;
- % sets b, nb, i.
- { /nb nb
- { dup BitsPerComponent ge { exit } if
- /b b 8 bitshift row i get add def
- /i i 1 add def 8 add
- }
- loop
- BitsPerComponent sub def
- b nb neg bitshift mask and
- } bind def
-
- /colorspaceimage % <width> <height> <bits/comp> <matrix>
- % <datasrc> <decode> <colorspace> colorspaceimage -
- { save 8 1 roll 20 dict begin
- cvlit /colorspace exch def cvlit /Decode exch def
- /DataSource exch def cvlit /ImageMatrix exch def
- /BitsPerComponent exch def /Height exch def /Width exch def
- colorspace dup 0 get .csncompdict exch get exec
- /setpixelcolor exch def /ncomp exch def pop
- /bpp ncomp BitsPerComponent mul def
- /row bpp Width mul 7 add 8 idiv string def
- languagelevel 2 gt %****** ge
- { colorspace setcolorspace /ImageType 1 def
- currentdict image
- }
- { /mask 1 BitsPerComponent bitshift 1 sub def
- /nextbits BitsPerComponent 8 eq
- { mark row { i get /i i 1 add def } aload pop .packtomark cvx }
- { /.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 row readstring pop pop }
- /DataSource load dup type
- dup /arraytype eq exch /packedarraytype eq or
- { % Must be { <file> <string> readhexstring pop }
- 0 get row /readhexstring load /pop load
- 4 array astore cvx exch pop
- }
- { pop
- }
- ifelse def
- ImageMatrix matrix invertmatrix concat
- 0 1 Height 1 sub
- { gsave 0 exch translate
- readrow
- /b 0 def /nb 0 def /i 0 def
- Width
- { nextpixel
- 1 1 true {1 0 0 1 0 0} {<80>} imagemask
- 1 0 translate
- }
- repeat grestore
- }
- for
- }
- ifelse end restore
- } bind def
-
- % 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
- /colorimage % <width> <height> <bits/comp> <matrix>
- % <datasrc> false <ncomp> colorimage -
- { 1 index { /colorimage load /rangecheck signalerror } if exch pop
- //.cincompdict exch get exec colorspaceimage
- } bind odef
- /image
- { dup type /dicttype ne
- { //image }
- { begin /Width load /Height load /BitsPerComponent load
- /ImageMatrix load /DataSource load /Decode load currentcolorspace
- end colorspaceimage
- }
- ifelse
- } bind odef
-
- exec
-