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
26package sun.font;
27
28import sun.java2d.Disposer;
29import 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
53class 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}
103