| /* |
| * Copyright (c) 1999, 2004, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package sun.java2d.loops; |
| |
| public final class RenderCache { |
| final class Entry { |
| private SurfaceType src; |
| private CompositeType comp; |
| private SurfaceType dst; |
| private Object value; |
| |
| public Entry(SurfaceType src, |
| CompositeType comp, |
| SurfaceType dst, |
| Object value) |
| { |
| this.src = src; |
| this.comp = comp; |
| this.dst = dst; |
| this.value = value; |
| } |
| |
| public boolean matches(SurfaceType src, |
| CompositeType comp, |
| SurfaceType dst) |
| { |
| // bug 4725045: using equals() causes different SurfaceType |
| // objects with the same strings to match in the cache, which is |
| // not the behavior we want. Constrain the match to succeed only |
| // on object matches instead. |
| return ((this.src == src) && |
| (this.comp == comp) && |
| (this.dst == dst)); |
| } |
| |
| public Object getValue() { |
| return value; |
| } |
| } |
| |
| private Entry entries[]; |
| |
| public RenderCache(int size) { |
| entries = new Entry[size]; |
| } |
| |
| public synchronized Object get(SurfaceType src, |
| CompositeType comp, |
| SurfaceType dst) |
| { |
| int max = entries.length - 1; |
| for (int i = max; i >= 0; i--) { |
| Entry e = entries[i]; |
| if (e == null) { |
| break; |
| } |
| if (e.matches(src, comp, dst)) { |
| if (i < max - 4) { |
| System.arraycopy(entries, i+1, entries, i, max - i); |
| entries[max] = e; |
| } |
| return e.getValue(); |
| } |
| } |
| |
| return null; |
| } |
| |
| public synchronized void put(SurfaceType src, |
| CompositeType comp, |
| SurfaceType dst, |
| Object value) |
| { |
| Entry e = new Entry(src, comp, dst, value); |
| |
| int num = entries.length; |
| System.arraycopy(entries, 1, entries, 0, num - 1); |
| entries[num - 1] = e; |
| } |
| } |