% Copyright (C) 1997, 1998 Aladdin Enterprises. All rights reserved. % % This program is free software; you can redistribute it and/or modify it % under the terms of the GNU General Public License as published by the % Free Software Foundation; either version 2 of the License, or (at your % option) any later version. % % This program is distributed in the hope that it will be useful, but % WITHOUT ANY WARRANTY; without even the implied warranty of % MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General % Public License for more details. % % You should have received a copy of the GNU General Public License along % with this program; if not, write to the Free Software Foundation, Inc., % 59 Temple Place, Suite 330, Boston, MA, 02111-1307. % $Id: gs_dpnxt.ps,v 1.2.6.1.2.1 2003/04/12 14:02:38 giles Exp $ % gs_dpnxt.ps % NeXT Display PostScript extensions % Define the operation values for compositing. These must match the values % in gsdpnext.h, which also are the ones from the NeXT documentation. % We put them in systemdict, which seems like as good a place as any. mark /Clear /Copy /Sover /Sin /Sout /Satop /Dover /Din /Dout /Datop /Xor /PlusD /PlusL /Highlight % not sure about Highlight counttomark { counttomark 1 sub def } repeat pop % We implement readimage and sizeimage using the following 3 otherwise % undocumented lower-level operators: % % .sizeimagebox % % % - .sizeimageparams % % % .getbitsrect % % NOTE: These operators are subject to change without notice! % Implement readimage using .getbitsrect. Experimentation on a NeXT system % shows that the data is always returned in order of increasing device Y, % regardless of the CTM. % % Note that we can't make stack protection work for this operator, % because it must remove its operands from the stack before calling % the supplied procedure(s). /readimage { % [... ] % readimage - .sizeimageparams exch { % multiproc = true. If N > 1, store the procedures in an array. exch pop 1 index { 1 add } if % Stack: ... string alpha? nprocs dup 1 eq { pop false % only 1 procedure, multiproc is irrelevant } { dup array 4 1 roll 3 add 2 roll astore 3 1 roll true } ifelse } { % multiproc = false. pop pop false } ifelse % Map the rectangle to device coordinates. % Stack: x y w h proc(s) str alpha? multi? 8 -4 roll matrix .sizeimagebox pop 8 4 roll % Make sure we allocate the operand array in local VM % to avoid a possible invalidaccess. .currentglobal false .setglobal 9 1 roll exch { 1 } { 0 } ifelse exch % alpha is last, if present exch 4 1 roll 8 array astore exch .setglobal { % Read out a block of scan lines and pass them to the procedure. % Stack: [x y w h alpha? proc(s) str multi?] -- we must consume this. dup 3 get 0 eq { pop exit } if aload 9 1 roll pop exch pop currentdevice 7 1 roll % Always read out the data as standard (not native) pixels. .sizeimageparams pop pop exch .getbitsrect % Stack: [x y w h alpha? proc(s) str multi?] hread substr 3 -1 roll % Stack: hread substr [x y w h alpha? proc(s) str multi?] dup 1 2 copy get 5 index add put % Stack: hread substr [x y' w h alpha? proc(s) str multi?] dup 3 2 copy get 6 -1 roll sub put % Stack: substr [x y' w h' alpha? proc(s) str multi?] dup 5 get exch 7 get { % multiproc = true, pass each plane to a different procedure. % Stack: substr procs 0 1 2 index length 1 sub { % Push 1 plane and its procedure under the top 2 elements. % Stack: ... substr procs plane# 2 index length 2 index length idiv % bytes per plane dup 2 index mul exch % Stack: ... substr procs plane# start length 4 index 3 1 roll getinterval 4 1 roll 2 copy get 4 1 roll pop } for exch pop length 2 mul .execn } { % multiproc = false, just call the procedure. exec } ifelse } //systemdict /exec get 3 packedarray cvx loop } bind odef % Implement sizeimage using lower-level operators. /sizeimage { % sizeimage % % .sizeimagebox 5 -2 roll pop pop .sizeimageparams 3 -1 roll 4 1 roll } bind odef