001: /*
002: * Copyright 2003-2006 Sun Microsystems, Inc. All Rights Reserved.
003: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004: *
005: * This code is free software; you can redistribute it and/or modify it
006: * under the terms of the GNU General Public License version 2 only, as
007: * published by the Free Software Foundation. Sun designates this
008: * particular file as subject to the "Classpath" exception as provided
009: * by Sun in the LICENSE file that accompanied this code.
010: *
011: * This code is distributed in the hope that it will be useful, but WITHOUT
012: * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
013: * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
014: * version 2 for more details (a copy is included in the LICENSE file that
015: * accompanied this code).
016: *
017: * You should have received a copy of the GNU General Public License version
018: * 2 along with this work; if not, write to the Free Software Foundation,
019: * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
020: *
021: * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
022: * CA 95054 USA or visit www.sun.com if you need additional information or
023: * have any questions.
024: */
025:
026: package sun.font;
027:
028: import sun.java2d.DisposerRecord;
029:
030: /*
031: * This keeps track of data that needs to be cleaned up once a
032: * strike is freed.
033: * a) The native memory that is the glyph image cache.
034: * b) removing the "desc" key from the strike's map.
035: * This is safe to do because this disposer is invoked only when the
036: * reference object has been cleared, which means the value indexed by
037: * this key is just an empty reference object.
038: * It is possible that a new FontStrike has been created that would
039: * be referenced by the same (equals) key. If it is placed in the map
040: * before this disposer is executed, then we do not want to remove that
041: * object. We should only remove an object where the value is null.
042: * So we first verify that the key still points to a cleared reference.
043: * Updates to the map thus need to be synchronized.
044: *
045: * A WeakHashmap will automatically clean up, but we might maintain a
046: * reference to the "desc" key in the FontStrike (value) which would
047: * prevent the keys from being discarded. And since the strike is the only
048: * place is likely we would maintain such a strong reference, then the map
049: * entries would be removed much more promptly than we need.
050: */
051:
052: class FontStrikeDisposer implements DisposerRecord {
053:
054: Font2D font2D;
055: FontStrikeDesc desc;
056: long[] longGlyphImages;
057: int[] intGlyphImages;
058: int[][] segIntGlyphImages;
059: long[][] segLongGlyphImages;
060: long pScalerContext = 0L;
061: boolean disposed = false;
062: boolean comp = false;
063:
064: public FontStrikeDisposer(Font2D font2D, FontStrikeDesc desc,
065: long pContext, int[] images) {
066: this .font2D = font2D;
067: this .desc = desc;
068: this .pScalerContext = pContext;
069: this .intGlyphImages = images;
070: }
071:
072: public FontStrikeDisposer(Font2D font2D, FontStrikeDesc desc,
073: long pContext, long[] images) {
074: this .font2D = font2D;
075: this .desc = desc;
076: this .pScalerContext = pContext;
077: this .longGlyphImages = images;
078: }
079:
080: public FontStrikeDisposer(Font2D font2D, FontStrikeDesc desc,
081: long pContext) {
082: this .font2D = font2D;
083: this .desc = desc;
084: this .pScalerContext = pContext;
085: }
086:
087: public FontStrikeDisposer(Font2D font2D, FontStrikeDesc desc) {
088: this .font2D = font2D;
089: this .desc = desc;
090: this .comp = true;
091: }
092:
093: public synchronized void dispose() {
094: if (!disposed) {
095: font2D.removeFromCache(desc);
096: StrikeCache.disposeStrike(this );
097: disposed = true;
098: }
099: }
100: }
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