summaryrefslogtreecommitdiff
path: root/Master/xemtex/gslib/gs_fform.ps
blob: 1042b014514fc0316ca571f5db2ce5f869ef380a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
%    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