104 lines
3.4 KiB
Java
104 lines
3.4 KiB
Java
/*
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* Copyright (c) 1999, 2004, 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.java2d.loops;
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public final class RenderCache {
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final class Entry {
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private SurfaceType src;
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private CompositeType comp;
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private SurfaceType dst;
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private Object value;
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public Entry(SurfaceType src,
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CompositeType comp,
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SurfaceType dst,
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Object value)
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{
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this.src = src;
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this.comp = comp;
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this.dst = dst;
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this.value = value;
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}
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public boolean matches(SurfaceType src,
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CompositeType comp,
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SurfaceType dst)
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{
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// bug 4725045: using equals() causes different SurfaceType
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// objects with the same strings to match in the cache, which is
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// not the behavior we want. Constrain the match to succeed only
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// on object matches instead.
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return ((this.src == src) &&
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(this.comp == comp) &&
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(this.dst == dst));
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}
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public Object getValue() {
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return value;
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}
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}
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private Entry entries[];
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public RenderCache(int size) {
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entries = new Entry[size];
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}
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public synchronized Object get(SurfaceType src,
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CompositeType comp,
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SurfaceType dst)
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{
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int max = entries.length - 1;
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for (int i = max; i >= 0; i--) {
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Entry e = entries[i];
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if (e == null) {
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break;
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}
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if (e.matches(src, comp, dst)) {
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if (i < max - 4) {
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System.arraycopy(entries, i+1, entries, i, max - i);
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entries[max] = e;
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}
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return e.getValue();
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}
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}
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return null;
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}
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public synchronized void put(SurfaceType src,
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CompositeType comp,
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SurfaceType dst,
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Object value)
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{
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Entry e = new Entry(src, comp, dst, value);
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int num = entries.length;
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System.arraycopy(entries, 1, entries, 0, num - 1);
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entries[num - 1] = e;
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}
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}
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