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% Copyright (C) 1995, 1996, 1998, 1999 Aladdin Enterprises. All rights reserved.
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%
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% This software is provided AS-IS with no warranty, either express or
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% implied.
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%
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% This software is distributed under license and may not be copied,
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% modified or distributed except as expressly authorized under the terms
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% of the license contained in the file LICENSE in this distribution.
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%
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% For more information about licensing, please refer to
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% http://www.ghostscript.com/licensing/. For information on
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% commercial licensing, go to http://www.artifex.com/licensing/ or
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% contact Artifex Software, Inc., 101 Lucas Valley Road #110,
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% San Rafael, CA 94903, U.S.A., +1(415)492-9861.
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% $Id: gs_fform.ps,v 1.4 2002/02/21 21:49:28 giles Exp $
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% Form caching implemented in PostScript.
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% This implementation doesn't do the right thing about halftone or
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% Pattern phase, but the Pattern cache doesn't either....
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% The Form cache key is the Form dictionary; the value is an array
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% of 2 elements [CTM pattern_instance].
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%
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% In order to prevent restore from clearing the cache, we explicitly
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% push the cache entries on the stack before a restore and reinstall them.
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currentglobal false setglobal
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/.formcachedict 20 dict def % must be local
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true setglobal
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/restore {
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mark .formcachedict { } forall
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counttomark 1 add index { //restore } .internalstopped
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{ cleartomark //restore }
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{ counttomark 2 idiv { .formcachedict 3 1 roll put } repeat pop pop }
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ifelse
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} bind odef
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/.execform1 {
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dup /Implementation known not {
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dup /FormType get 1 ne { /rangecheck signalerror } if
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% The Implementation is a Pattern that will draw the form.
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currentglobal 1 index gcheck setglobal
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% Stack: form global
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10 dict begin
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/PatternType 1 def
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/PaintType 1 def % colored
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/TilingType 1 def % irrelevant
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% Copy the BBox to the correct VM.
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/BBox 2 index /BBox get 4 array copy exch 1 index def
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% Set XStep and YStep to very large numbers,
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% so we won't get multiple copies of the form.
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/XStep 1 index dup 2 get exch 0 get sub 100 mul def
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/YStep exch dup 3 get exch 1 get sub 100 mul def
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/PaintProc 2 index /PaintProc get def
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currentdict end readonly
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% Stack: form global impl
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exch setglobal
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1 index /Implementation 3 -1 roll .forceput
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} if
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.formcachedict 1 index .knownget {
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% Check whether we can use the cached value.
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% Stack: form cachevalue
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matrix currentmatrix true 0 1 3 {
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% Stack: form cachevalue curmat true index
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3 index 0 get 1 index get exch 3 index exch get ne {
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pop pop false exit
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} if
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} for exch pop
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} {
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false
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} ifelse not
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{ % Make a new cache entry.
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gsave
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matrix currentmatrix dup 4 0 put dup 5 0 put dup setmatrix
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% Stack: form mat
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1 index /Implementation get
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2 index /Matrix get
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makepattern 2 array astore
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.formcachedict 2 index 2 index put
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grestore
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} if
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% Stack: form cachevalue
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-1 0 0 transform
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2 { exch round cvi } repeat .setscreenphase
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1 get setpattern
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/BBox get aload pop
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exch 3 index sub exch 2 index sub rectfill
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} .bind odef % must bind .forceput
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.formtypes 1 /.execform1 load put
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setglobal
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