| J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2003-2005 Sun Microsystems, Inc. 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. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * 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 | } |