Showing the changes to java/pkg/sun/java2d/loops/RenderCache.java (1 of 18352 files). Show all
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| 1 | +/* | |
| 2 | + * Copyright (c) 1999, 2004, Oracle and/or its affiliates. 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. Oracle designates this | |
| 8 | + * particular file as subject to the "Classpath" exception as provided | |
| 9 | + * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 22 | + * or visit www.oracle.com if you need additional information or have any | |
| 23 | + * questions. | |
| 24 | + */ | |
| 25 | + | |
| 26 | +package sun.java2d.loops; | |
| 27 | + | |
| 28 | +public final class RenderCache { | |
| 29 | + final class Entry { | |
| 30 | + private SurfaceType src; | |
| 31 | + private CompositeType comp; | |
| 32 | + private SurfaceType dst; | |
| 33 | + private Object value; | |
| 34 | + | |
| 35 | + public Entry(SurfaceType src, | |
| 36 | + CompositeType comp, | |
| 37 | + SurfaceType dst, | |
| 38 | + Object value) | |
| 39 | + { | |
| 40 | + this.src = src; | |
| 41 | + this.comp = comp; | |
| 42 | + this.dst = dst; | |
| 43 | + this.value = value; | |
| 44 | + } | |
| 45 | + | |
| 46 | + public boolean matches(SurfaceType src, | |
| 47 | + CompositeType comp, | |
| 48 | + SurfaceType dst) | |
| 49 | + { | |
| 50 | + // bug 4725045: using equals() causes different SurfaceType | |
| 51 | + // objects with the same strings to match in the cache, which is | |
| 52 | + // not the behavior we want. Constrain the match to succeed only | |
| 53 | + // on object matches instead. | |
| 54 | + return ((this.src == src) && | |
| 55 | + (this.comp == comp) && | |
| 56 | + (this.dst == dst)); | |
| 57 | + } | |
| 58 | + | |
| 59 | + public Object getValue() { | |
| 60 | + return value; | |
| 61 | + } | |
| 62 | + } | |
| 63 | + | |
| 64 | + private Entry entries[]; | |
| 65 | + | |
| 66 | + public RenderCache(int size) { | |
| 67 | + entries = new Entry[size]; | |
| 68 | + } | |
| 69 | + | |
| 70 | + public synchronized Object get(SurfaceType src, | |
| 71 | + CompositeType comp, | |
| 72 | + SurfaceType dst) | |
| 73 | + { | |
| 74 | + int max = entries.length - 1; | |
| 75 | + for (int i = max; i >= 0; i--) { | |
| 76 | + Entry e = entries[i]; | |
| 77 | + if (e == null) { | |
| 78 | + break; | |
| 79 | + } | |
| 80 | + if (e.matches(src, comp, dst)) { | |
| 81 | + if (i < max - 4) { | |
| 82 | + System.arraycopy(entries, i+1, entries, i, max - i); | |
| 83 | + entries[max] = e; | |
| 84 | + } | |
| 85 | + return e.getValue(); | |
| 86 | + } | |
| 87 | + } | |
| 88 | + | |
| 89 | + return null; | |
| 90 | + } | |
| 91 | + | |
| 92 | + public synchronized void put(SurfaceType src, | |
| 93 | + CompositeType comp, | |
| 94 | + SurfaceType dst, | |
| 95 | + Object value) | |
| 96 | + { | |
| 97 | + Entry e = new Entry(src, comp, dst, value); | |
| 98 | + | |
| 99 | + int num = entries.length; | |
| 100 | + System.arraycopy(entries, 1, entries, 0, num - 1); | |
| 101 | + entries[num - 1] = e; | |
| 102 | + } | |
| 103 | +} | |