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103 lines
3.8 KiB
Java
103 lines
3.8 KiB
Java
/*
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* Copyright (c) 2003, 2006, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package sun.font;
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import sun.java2d.Disposer;
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import sun.java2d.DisposerRecord;
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/*
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* This keeps track of data that needs to be cleaned up once a
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* strike is freed.
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* a) The native memory that is the glyph image cache.
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* b) removing the "desc" key from the strike's map.
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* This is safe to do because this disposer is invoked only when the
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* reference object has been cleared, which means the value indexed by
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* this key is just an empty reference object.
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* It is possible that a new FontStrike has been created that would
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* be referenced by the same (equals) key. If it is placed in the map
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* before this disposer is executed, then we do not want to remove that
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* object. We should only remove an object where the value is null.
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* So we first verify that the key still points to a cleared reference.
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* Updates to the map thus need to be synchronized.
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*
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* A WeakHashmap will automatically clean up, but we might maintain a
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* reference to the "desc" key in the FontStrike (value) which would
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* prevent the keys from being discarded. And since the strike is the only
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* place is likely we would maintain such a strong reference, then the map
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* entries would be removed much more promptly than we need.
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*/
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class FontStrikeDisposer
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implements DisposerRecord, Disposer.PollDisposable {
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Font2D font2D;
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FontStrikeDesc desc;
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long[] longGlyphImages;
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int [] intGlyphImages;
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int [][] segIntGlyphImages;
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long[][] segLongGlyphImages;
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long pScalerContext = 0L;
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boolean disposed = false;
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boolean comp = false;
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public FontStrikeDisposer(Font2D font2D, FontStrikeDesc desc,
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long pContext, int[] images) {
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this.font2D = font2D;
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this.desc = desc;
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this.pScalerContext = pContext;
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this.intGlyphImages = images;
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}
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public FontStrikeDisposer(Font2D font2D, FontStrikeDesc desc,
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long pContext, long[] images) {
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this.font2D = font2D;
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this.desc = desc;
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this.pScalerContext = pContext;
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this.longGlyphImages = images;
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}
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public FontStrikeDisposer(Font2D font2D, FontStrikeDesc desc,
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long pContext) {
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this.font2D = font2D;
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this.desc = desc;
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this.pScalerContext = pContext;
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}
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public FontStrikeDisposer(Font2D font2D, FontStrikeDesc desc) {
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this.font2D = font2D;
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this.desc = desc;
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this.comp = true;
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}
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public synchronized void dispose() {
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if (!disposed) {
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font2D.removeFromCache(desc);
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StrikeCache.disposeStrike(this);
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disposed = true;
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}
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}
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}
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