1 /*
2 * Copyright (c) 2003, 2006, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package sun.font;
27
28 import sun.java2d.Disposer;
29 import sun.java2d.DisposerRecord;
30
31 /*
32 * This keeps track of data that needs to be cleaned up once a
33 * strike is freed.
34 * a) The native memory that is the glyph image cache.
35 * b) removing the "desc" key from the strike's map.
36 * This is safe to do because this disposer is invoked only when the
37 * reference object has been cleared, which means the value indexed by
38 * this key is just an empty reference object.
39 * It is possible that a new FontStrike has been created that would
40 * be referenced by the same (equals) key. If it is placed in the map
41 * before this disposer is executed, then we do not want to remove that
42 * object. We should only remove an object where the value is null.
43 * So we first verify that the key still points to a cleared reference.
44 * Updates to the map thus need to be synchronized.
45 *
46 * A WeakHashmap will automatically clean up, but we might maintain a
47 * reference to the "desc" key in the FontStrike (value) which would
48 * prevent the keys from being discarded. And since the strike is the only
49 * place is likely we would maintain such a strong reference, then the map
50 * entries would be removed much more promptly than we need.
51 */
52
53 class FontStrikeDisposer
54 implements DisposerRecord, Disposer.PollDisposable {
55
56 Font2D font2D;
57 FontStrikeDesc desc;
58 long[] longGlyphImages;
59 int [] intGlyphImages;
60 int [][] segIntGlyphImages;
61 long[][] segLongGlyphImages;
62 long pScalerContext = 0L;
63 boolean disposed = false;
64 boolean comp = false;
65
66 public FontStrikeDisposer(Font2D font2D, FontStrikeDesc desc,
67 long pContext, int[] images) {
68 this.font2D = font2D;
69 this.desc = desc;
70 this.pScalerContext = pContext;
71 this.intGlyphImages = images;
72 }
73
74 public FontStrikeDisposer(Font2D font2D, FontStrikeDesc desc,
75 long pContext, long[] images) {
76 this.font2D = font2D;
77 this.desc = desc;
78 this.pScalerContext = pContext;
79 this.longGlyphImages = images;
80 }
81
82 public FontStrikeDisposer(Font2D font2D, FontStrikeDesc desc,
83 long pContext) {
84 this.font2D = font2D;
85 this.desc = desc;
86 this.pScalerContext = pContext;
87 }
88
89 public FontStrikeDisposer(Font2D font2D, FontStrikeDesc desc) {
90 this.font2D = font2D;
91 this.desc = desc;
92 this.comp = true;
93 }
94
95 public synchronized void dispose() {
96 if (!disposed) {
97 font2D.removeFromCache(desc);
98 StrikeCache.disposeStrike(this);
99 disposed = true;
100 }
101 }
102 }