01: /*
02: * Copyright 2003-2005 Sun Microsystems, Inc. All Rights Reserved.
03: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
04: *
05: * This code is free software; you can redistribute it and/or modify it
06: * under the terms of the GNU General Public License version 2 only, as
07: * published by the Free Software Foundation. Sun designates this
08: * particular file as subject to the "Classpath" exception as provided
09: * by Sun in the LICENSE file that accompanied this code.
10: *
11: * This code is distributed in the hope that it will be useful, but WITHOUT
12: * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13: * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14: * version 2 for more details (a copy is included in the LICENSE file that
15: * accompanied this code).
16: *
17: * You should have received a copy of the GNU General Public License version
18: * 2 along with this work; if not, write to the Free Software Foundation,
19: * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20: *
21: * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
22: * CA 95054 USA or visit www.sun.com if you need additional information or
23: * have any questions.
24: */
25:
26: package sun.font;
27:
28: /*
29: * This keeps track of data that needs to be cleaned up once a
30: * strike is freed.
31: * a) The native memory that is the glyph image cache.
32: * b) removing the "desc" key from the strike's map.
33: * This is safe to do because this disposer is invoked only when the
34: * reference object has been cleared, which means the value indexed by
35: * this key is just an empty reference object.
36: * It is possible that a new FontStrike has been created that would
37: * be referenced by the same (equals) key. If it is placed in the map
38: * before this disposer is executed, then we do not want to remove that
39: * object. We should only remove an object where the value is null.
40: * So we first verify that the key still points to a cleared reference.
41: * Updates to the map thus need to be synchronized.
42: *
43: * A WeakHashmap will automatically clean up, but we might maintain a
44: * reference to the "desc" key in the FontStrike (value) which would
45: * prevent the keys from being discarded. And since the strike is the only
46: * place is likely we would maintain such a strong reference, then the map
47: * entries would be removed much more promptly than we need.
48: */
49:
50: class NativeStrikeDisposer extends FontStrikeDisposer {
51:
52: long pNativeScalerContext;
53:
54: public NativeStrikeDisposer(Font2D font2D, FontStrikeDesc desc,
55: long pContext, int[] images) {
56: super (font2D, desc, 0L, images);
57: pNativeScalerContext = pContext;
58: }
59:
60: public NativeStrikeDisposer(Font2D font2D, FontStrikeDesc desc,
61: long pContext, long[] images) {
62: super (font2D, desc, 0L, images);
63: pNativeScalerContext = pContext;
64: }
65:
66: public NativeStrikeDisposer(Font2D font2D, FontStrikeDesc desc,
67: long pContext) {
68: super (font2D, desc, 0L);
69: pNativeScalerContext = pContext;
70: }
71:
72: public NativeStrikeDisposer(Font2D font2D, FontStrikeDesc desc) {
73: super (font2D, desc);
74: }
75:
76: public synchronized void dispose() {
77: if (!disposed) {
78: if (pNativeScalerContext != 0L) {
79: freeNativeScalerContext(pNativeScalerContext);
80: }
81: super .dispose();
82: }
83: }
84:
85: private native void freeNativeScalerContext(long pContext);
86: }
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