1/*
2 * Copyright (c) 2011, 2013, 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
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 */
49class CStrikeDisposer extends FontStrikeDisposer {
50
51    long pNativeScalerContext;
52
53    public CStrikeDisposer(Font2D font2D, FontStrikeDesc desc,
54                               long pContext, int[] images)
55    {
56        super(font2D, desc, 0L, images);
57        pNativeScalerContext = pContext;
58    }
59
60    public CStrikeDisposer(Font2D font2D, FontStrikeDesc desc,
61                               long pContext, long[] images)
62    {
63        super(font2D, desc, 0L, images);
64        pNativeScalerContext = pContext;
65    }
66
67    public CStrikeDisposer(Font2D font2D, FontStrikeDesc desc,
68                               long pContext)
69    {
70        super(font2D, desc, 0L);
71        pNativeScalerContext = pContext;
72    }
73
74    public CStrikeDisposer(Font2D font2D, FontStrikeDesc desc) {
75        super(font2D, desc);
76    }
77
78    public synchronized void dispose() {
79        if (!disposed) {
80            if (pNativeScalerContext != 0L) {
81                freeNativeScalerContext(pNativeScalerContext);
82            }
83            super.dispose();
84        }
85    }
86
87    private native void freeNativeScalerContext(long pContext);
88
89    protected static native void removeGlyphInfoFromCache(long glyphInfo);
90}
91