Import sources from 2011-03-30 iso image - sys/lib

1 files changed, 92 insertions, 0 deletions

diff --git a/sys/lib/ghostscript/gs_fform.ps b/sys/lib/ghostscript/gs_fform.ps
new file mode 100755
index 000000000..55a471acd
--- /dev/null
+++ b/sys/lib/ghostscript/gs_fform.ps
@@ -0,0 +1,92 @@
+%    Copyright (C) 1995, 1996, 1998, 1999 Aladdin Enterprises.  All rights reserved.
+% 
+% This software is provided AS-IS with no warranty, either express or
+% implied.
+% 
+% This software is distributed under license and may not be copied,
+% modified or distributed except as expressly authorized under the terms
+% of the license contained in the file LICENSE in this distribution.
+% 
+% For more information about licensing, please refer to
+% http://www.ghostscript.com/licensing/. For information on
+% commercial licensing, go to http://www.artifex.com/licensing/ or
+% contact Artifex Software, Inc., 101 Lucas Valley Road #110,
+% San Rafael, CA  94903, U.S.A., +1(415)492-9861.
+
+% $Id: gs_fform.ps,v 1.4 2002/02/21 21:49:28 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