✏️ Editing: docie.ps Read Only

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% implied.
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% This software is distributed under license and may not be copied,
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% of the license contained in the file LICENSE in this distribution.
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% 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		% <v> <w> [<pu> <pv> <pw>] apply3 <u'> <v'> <w'>
 { { 4 -1 roll exch exec } forall
 } bind def

/restrict	% <min> <max> restrict <u'>
 { 3 1 roll .max .min
 } bind def

/restrict3	% <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	% <min> <max> rescale <u'>
 { 1 index sub 3 1 roll sub exch div 0 .max 1 .min
 } bind def

/rescale3	% <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		% <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> <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> <c> mapcie <v1> ...
 { currentcolorspace dup 0 get //mapdict exch get exec
 } bind def

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