% Copyright (C) 1995, 1996, 1998, 1999 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_fform.ps,v 1.2.6.1.2.1 2003/04/12 14:02:38 giles Exp $ % Form caching implemented in PostScript. % This implementation doesn't do the right thing about halftone or % Pattern phase, but the Pattern cache doesn't either.... % The Form cache key is the Form dictionary; the value is an array % of 2 elements [CTM pattern_instance]. % % In order to prevent restore from clearing the cache, we explicitly % push the cache entries on the stack before a restore and reinstall them. currentglobal false setglobal /.formcachedict 20 dict def % must be local true setglobal /restore { mark .formcachedict { } forall counttomark 1 add index { //restore } .internalstopped { cleartomark //restore } { counttomark 2 idiv { .formcachedict 3 1 roll put } repeat pop pop } ifelse } bind odef /.execform1 { dup /Implementation known not { dup /FormType get 1 ne { /rangecheck signalerror } if % The Implementation is a Pattern that will draw the form. currentglobal 1 index gcheck setglobal % Stack: form global 10 dict begin /PatternType 1 def /PaintType 1 def % colored /TilingType 1 def % irrelevant % Copy the BBox to the correct VM. /BBox 2 index /BBox get 4 array copy exch 1 index def % Set XStep and YStep to very large numbers, % so we won't get multiple copies of the form. /XStep 1 index dup 2 get exch 0 get sub 100 mul def /YStep exch dup 3 get exch 1 get sub 100 mul def /PaintProc 2 index /PaintProc get def currentdict end readonly % Stack: form global impl exch setglobal 1 index /Implementation 3 -1 roll .forceput } if .formcachedict 1 index .knownget { % Check whether we can use the cached value. % Stack: form cachevalue matrix currentmatrix true 0 1 3 { % Stack: form cachevalue curmat true index 3 index 0 get 1 index get exch 3 index exch get ne { pop pop false exit } if } for exch pop } { false } ifelse not { % Make a new cache entry. gsave matrix currentmatrix dup 4 0 put dup 5 0 put dup setmatrix % Stack: form mat 1 index /Implementation get 2 index /Matrix get makepattern 2 array astore .formcachedict 2 index 2 index put grestore } if % Stack: form cachevalue -1 0 0 transform 2 { exch round cvi } repeat .setscreenphase 1 get setpattern /BBox get aload pop exch 3 index sub exch 2 index sub rectfill } .bind odef % must bind .forceput .formtypes 1 /.execform1 load put setglobal