% Copyright (C) 1995 Aladdin Enterprises. All rights reserved. % % This file is part of AFPL Ghostscript. % % AFPL 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 Free Public License (the % "License") for full details. % % Every copy of AFPL 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 AFPL 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. % $Id: docie.ps,v 1.2 2000/09/19 18:29:11 lpd Exp $ % docie.ps % Emulate CIE algorithms in PostScript. % ---------------- Auxiliary procedures ---------------- % /r1default [0 1] def /r3default [0 1 0 1 0 1] def /apply3 % [ ] apply3 { { 4 -1 roll exch exec } forall } bind def /restrict % restrict { 3 1 roll .max .min } bind def /restrict3 % [ ... ] restrict3 { aload pop 7 -1 roll 3 1 roll restrict 7 1 roll 5 -1 roll 3 1 roll restrict 5 1 roll restrict 3 1 roll } bind def /rescale % rescale { 1 index sub 3 1 roll sub exch div 0 .max 1 .min } bind def /rescale3 % [ ... ] rescale3 { aload pop 7 -1 roll 3 1 roll rescale 7 1 roll 5 -1 roll 3 1 roll rescale 5 1 roll rescale 3 1 roll } bind def /mmult3 % [ ... ] mmult3 % { 4 -1 roll dup dup 6 -1 roll dup dup 8 -1 roll dup dup 10 -1 roll { 10 -1 roll mul } forall % Stack: u1 v1 w1 u2 v2 w2 u3 v3 w3 4 -1 roll add 6 -1 roll add % Stack: u1 v1 u2 v2 u3 v3 w' 7 1 roll 3 -1 roll add 4 -1 roll add % Stack: w' u1 u2 u3 v' 5 1 roll add add 3 1 roll } bind def /minvert3 % [ ... ] minvert3 % [ ... ] { 16 dict begin aload pop { I H G F E D C B A } { exch def } forall /coa E I mul F H mul sub def /cob F G mul D I mul sub def /coc D H mul E G mul sub def /det A coa mul B cob mul add C coc mul add def [ coa det div C H mul B I mul sub det div B F mul C E mul sub det div cob det div A I mul C G mul sub det div C D mul A F mul sub det div coc det div B G mul A H mul sub det div A E mul B D mul sub det div ] end } bind def /print1 { print dup == } bind def /print3 { print 3 array astore dup == aload pop } bind def % ---------------- Mapping to XYZ ---------------- % /csmap % csmap { 3 index /RangeLMN .knownget not { r3default } if restrict3 DEBUG { (After RangeLMN Decode: ) print3 } if 3 index /DecodeLMN .knownget { apply3 } if DEBUG { (After DecodeLMN Decode: ) print3 } if 3 index /MatrixLMN .knownget { mmult3 } if DEBUG { (After MatrixLMN Decode: ) print3 } if } bind def /csciea % csciea { 1 index /RangeA .knownget not { r1default } if restrict DEBUG { (After RangeA Decode: ) print1 } if 1 index /DecodeA .knownget { exec } if DEBUG { (After DecodeA Decode: ) print1 } if 1 index /MatrixA .knownget { { 1 index mul exch } forall pop } { dup dup } ifelse DEBUG { (After MatrixA Decode: ) print3 } if csmap } bind def /cscieabc % cscieabc { 3 index /RangeABC .knownget not { r3default } if restrict3 DEBUG { (After RangeABC Decode: ) print3 } if 3 index /DecodeABC .knownget { apply3 } if DEBUG { (After DecodeABC Decode: ) print3 } if 3 index /MatrixABC .knownget { mmult3 } if DEBUG { (After MatrixABC Decode: ) print3 } if csmap } bind def % ---------------- Rendering from XYZ ---------------- % /lookup3 % lookup3 % { 3 -1 roll 3 index 0 get 1 sub mul 3 -1 roll 3 index 1 get 1 sub mul 3 -1 roll 3 index 2 get 1 sub mul % Stack: rtable ia ib ic DEBUG { (RenderTable indices: ) print3 mark 5 1 roll } if 3 -1 roll round cvi 3 index 3 get exch get % Stack: rtable ib ic string 3 -1 roll round cvi 3 index 2 get mul % Stack: rtable ic string ib*nc 3 -1 roll round cvi add 2 index 4 get mul % Stack: rtable string index 2 index 4 get getinterval % Stack: rtable bytes DEBUG { (RenderTable values: ) print (<) print (%stdout) (w) file 1 index writehexstring (>) = } if } bind def /bpdefault [0 0 0] def /crmap % crmap ... { DEBUG { (CIE XYZ = ) print3 } if 3 index /MatrixPQR .knownget { mmult3 } if DEBUG { (After MatrixPQR: ) print3 } if 4 index /WhitePoint get 5 index /BlackPoint .knownget not { bpdefault } if 5 index /WhitePoint get 6 index /BlackPoint .knownget not { bpdefault } if 4 { 4 -1 roll aload pop % Stack: csdict crdict x y z pt pt pt px py pz 3 copy 12 index /MatrixPQR .knownget { mmult3 } if 6 array astore } repeat % Stack: csdict crdict x y z wps+ bps+ wpd+ bpd+ 9 -1 roll pop % get rid of csdict 7 4 roll 7 index /TransformPQR get { % Stack: crdict wps+ bps+ wpd+ bpd+ u v w proc 8 copy exch pop exch pop exec exch pop 4 -1 roll pop } forall 7 3 roll pop pop pop pop % get rid of White/BlackPoints DEBUG { (After TransformPQR: ) print3 } if 3 index /MatrixPQR .knownget { minvert3 mmult3 } if DEBUG { (After MatrixPQR': ) print3 } if 3 index /MatrixLMN .knownget { mmult3 } if DEBUG { (After MatrixLMN Encode: ) print3 } if 3 index /EncodeLMN .knownget { apply3 } if DEBUG { (After EncodeLMN Encode: ) print3 } if 3 index /RangeLMN .knownget not { r3default } if restrict3 DEBUG { (After RangeLMN Encode: ) print3 } if 3 index /MatrixABC .knownget { mmult3 } if DEBUG { (After MatrixABC Encode: ) print3 } if 3 index /EncodeABC .knownget { apply3 } if DEBUG { (After EncodeABC Encode: ) print3 } if 3 index /RangeABC .knownget not { r3default } if 5 -1 roll /RenderTable .knownget { % Stack: u v w ranges rtable 5 1 roll rescale3 DEBUG { (Rescaled ABC: ) print3 } if % Stack: rtable a b c lookup3 % Stack: rtable bytes 0 1 3 index 4 get 1 sub { % Stack: values rtable bytes c 2 copy get 255 div % Stack: values rtable bytes c v 3 index 3 -1 roll 5 add get exec 3 1 roll } for pop pop DEBUG { (After RenderTableT: ) print ] dup == aload pop } if } { restrict3 DEBUG { (After RangeABC Encode: ) print3 } if } ifelse } bind def % ---------------- Top level control ---------------- % /mapdict mark /CIEBasedA { 1 get exch csciea currentcolorrendering 4 1 roll crmap } bind /CIEBasedABC { 1 get 4 1 roll cscieabc currentcolorrendering 4 1 roll crmap } bind .dicttomark def /mapcie % mapcie ... % mapcie ... { currentcolorspace dup 0 get //mapdict exch get exec } bind def