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% Copyright (C) 1995, 1996, 1998, 1999 Aladdin Enterprises. All rights reserved.
%
% This file is part of AFPL Ghostscript.
%
% AFPL Ghostscript is distributed with NO WARRANTY OF ANY KIND. No author or
% distributor accepts any responsibility for the consequences of using it, or
% for whether it serves any particular purpose or works at all, unless he or
% she says so in writing. Refer to the Aladdin Free Public License (the
% "License") for full details.
%
% Every copy of AFPL Ghostscript must include a copy of the License, normally
% in a plain ASCII text file named PUBLIC. The License grants you the right
% to copy, modify and redistribute AFPL Ghostscript, but only under certain
% conditions described in the License. Among other things, the License
% requires that the copyright notice and this notice be preserved on all
% copies.
% $Id$
% 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
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