1 /* 2 * Copyright (c) 2003, 2008, 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; 27 28 import sun.awt.image.SunVolatileImage; 29 import sun.awt.image.VolatileSurfaceManager; 30 31 /** 32 * This factory creates platform specific VolatileSurfaceManager 33 * implementations. 34 * 35 * There are two platform specific SurfaceManagerFactories in OpenJDK, 36 * UnixSurfaceManagerFactory and WindowsSurfaceManagerFactory. 37 * The actually used SurfaceManagerFactory is set by the respective platform 38 * GraphicsEnvironment implementations in the static initializer. 39 */ 40 public abstract class SurfaceManagerFactory { 41 42 /** 43 * The single shared instance. 44 */ 45 private static SurfaceManagerFactory instance; 46 47 /** 48 * Returns the surface manager factory instance. This returns a factory 49 * that has been set by {@link #setInstance(SurfaceManagerFactory)}. 50 * 51 * @return the surface manager factory 52 */ 53 public synchronized static SurfaceManagerFactory getInstance() { 54 55 if (instance == null) { 56 throw new IllegalStateException("No SurfaceManagerFactory set."); 57 } 58 return instance; 59 } 60 61 /** 62 * Sets the surface manager factory. This may only be called once, and it 63 * may not be set back to {@code null} when the factory is already 64 * instantiated. 65 * 66 * @param factory the factory to set 67 */ 68 public synchronized static void setInstance(SurfaceManagerFactory factory) { 69 70 if (factory == null) { 71 // We don't want to allow setting this to null at any time. 72 throw new IllegalArgumentException("factory must be non-null"); 73 } 74 75 if (instance != null) { 76 // We don't want to re-set the instance at any time. 77 throw new IllegalStateException("The surface manager factory is already initialized"); 78 } 79 80 instance = factory; 81 } 82 83 /** 84 * Creates a new instance of a VolatileSurfaceManager given any 85 * arbitrary SunVolatileImage. An optional context Object can be supplied 86 * as a way for the caller to pass pipeline-specific context data to 87 * the VolatileSurfaceManager (such as a backbuffer handle, for example). 88 */ 89 public abstract VolatileSurfaceManager 90 createVolatileManager(SunVolatileImage image, Object context); 91 }