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docie.ps
% Copyright (C) 2001-2021 Artifex Software, Inc. % 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. % % Refer to licensing information at http://www.artifex.com or contact % Artifex Software, Inc., 1305 Grant Avenue - Suite 200, Novato, % CA 94945, U.S.A., +1(415)492-9861, for further information. % % docie.ps % Emulate CIE algorithms in PostScript. % ---------------- Auxiliary procedures ---------------- % /r1default [0 1] def /r3default [0 1 0 1 0 1] def /apply3 % <u> <v> <w> [<pu> <pv> <pw>] apply3 <u'> <v'> <w'> { { 4 -1 roll exch exec } forall } bind def /restrict % <u> <min> <max> restrict <u'> { 3 1 roll .max .min } bind def /restrict3 % <u> <v> <w> [<minu> ... <maxw>] restrict3 <u'> <v'> <w'> { 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 % <u> <min> <max> rescale <u'> { 1 index sub 3 1 roll sub exch div 0 .max 1 .min } bind def /rescale3 % <u> <v> <w> [<minu> ... <maxw>] rescale3 <u'> <v'> <w'> { 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 % <u> <v> <w> [<uu> <uv> ... <wv> <ww>] mmult3 % <u'> <v'> <w'> { 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 % [<uu> <uv> ... <wv> <ww>] minvert3 % [<uu'> <uv'> ... <wv'> <ww'>] { 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 % <csdict> <l> <m> <n> csmap <csdict> <x> <y> <z> { 3 index /RangeLMN .knownget not { r3default } if restrict3 DOCIEDEBUG { (After RangeLMN Decode: ) print3 } if 3 index /DecodeLMN .knownget { apply3 } if DOCIEDEBUG { (After DecodeLMN Decode: ) print3 } if 3 index /MatrixLMN .knownget { mmult3 } if DOCIEDEBUG { (After MatrixLMN Decode: ) print3 } if } bind def /csciea % <csdict> <a> csciea <csdict> <x> <y> <z> { 1 index /RangeA .knownget not { r1default aload pop } if restrict DOCIEDEBUG { (After RangeA Decode: ) print1 } if 1 index /DecodeA .knownget { exec } if DOCIEDEBUG { (After DecodeA Decode: ) print1 } if 1 index /MatrixA .knownget { { 1 index mul exch } forall pop } { dup dup } ifelse DOCIEDEBUG { (After MatrixA Decode: ) print3 } if csmap } bind def /cscieabc % <csdict> <a> <b> <c> cscieabc <csdict> <x> <y> <z> { 3 index /RangeABC .knownget not { r3default } if restrict3 DOCIEDEBUG { (After RangeABC Decode: ) print3 } if 3 index /DecodeABC .knownget { apply3 } if DOCIEDEBUG { (After DecodeABC Decode: ) print3 } if 3 index /MatrixABC .knownget { mmult3 } if DOCIEDEBUG { (After MatrixABC Decode: ) print3 } if csmap } bind def % ---------------- Rendering from XYZ ---------------- % /lookup3 % <rtable> <a[0..1]> <b[0..1]> <c[0..1]> lookup3 % <rtable> <bytes> { 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 DOCIEDEBUG { (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 DOCIEDEBUG { (RenderTable values: ) print (<) print (%stdout) (w) file 1 index writehexstring (>) = } if } bind def /bpdefault [0 0 0] def /crmap % <csdict> <crdict> <x> <y> <z> crmap <v1> ... { DOCIEDEBUG { (CIE XYZ = ) print3 } if 3 index /MatrixPQR .knownget { mmult3 } if DOCIEDEBUG { (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 DOCIEDEBUG { (After TransformPQR: ) print3 } if 3 index /MatrixPQR .knownget { minvert3 mmult3 } if DOCIEDEBUG { (After MatrixPQR': ) print3 } if 3 index /MatrixLMN .knownget { mmult3 } if DOCIEDEBUG { (After MatrixLMN Encode: ) print3 } if 3 index /EncodeLMN .knownget { apply3 } if DOCIEDEBUG { (After EncodeLMN Encode: ) print3 } if 3 index /RangeLMN .knownget not { r3default } if restrict3 DOCIEDEBUG { (After RangeLMN Encode: ) print3 } if 3 index /MatrixABC .knownget { mmult3 } if DOCIEDEBUG { (After MatrixABC Encode: ) print3 } if 3 index /EncodeABC .knownget { apply3 } if DOCIEDEBUG { (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 DOCIEDEBUG { (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 DOCIEDEBUG { (After RenderTableT: ) print ] dup == aload pop } if } { restrict3 DOCIEDEBUG { (After RangeABC Encode: ) print3 } if } ifelse } bind def % ---------------- Top level control ---------------- % /mapdict mark /CIEBasedA { 1 get exch csciea currentcolorrendering 4 1 roll crmap } bind /DeviceGray { pop /DefaultGray /ColorSpace findresource 1 get exch csciea currentcolorrendering 4 1 roll crmap } bind /CIEBasedABC { 1 get 4 1 roll cscieabc currentcolorrendering 4 1 roll crmap } bind /DeviceRGB { pop /DefaultRGB /ColorSpace findresource 1 get 4 1 roll cscieabc currentcolorrendering 4 1 roll crmap } bind .dicttomark def /mapcie % <a> mapcie <v1> ... % <a> <b> <c> mapcie <v1> ... { currentcolorspace dup 0 get //mapdict exch get exec } bind def
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