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+% 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