92 lines
3.4 KiB
Java
92 lines
3.4 KiB
Java
/*
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* Copyright (c) 2003, 2008, 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;
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import sun.awt.image.SunVolatileImage;
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import sun.awt.image.VolatileSurfaceManager;
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/**
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* This factory creates platform specific VolatileSurfaceManager
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* implementations.
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*
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* There are two platform specific SurfaceManagerFactories in OpenJDK,
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* UnixSurfaceManagerFactory and WindowsSurfaceManagerFactory.
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* The actually used SurfaceManagerFactory is set by the respective platform
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* GraphicsEnvironment implementations in the static initializer.
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*/
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public abstract class SurfaceManagerFactory {
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/**
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* The single shared instance.
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*/
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private static SurfaceManagerFactory instance;
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/**
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* Returns the surface manager factory instance. This returns a factory
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* that has been set by {@link #setInstance(SurfaceManagerFactory)}.
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*
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* @return the surface manager factory
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*/
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public synchronized static SurfaceManagerFactory getInstance() {
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if (instance == null) {
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throw new IllegalStateException("No SurfaceManagerFactory set.");
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}
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return instance;
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}
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/**
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* Sets the surface manager factory. This may only be called once, and it
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* may not be set back to {@code null} when the factory is already
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* instantiated.
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*
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* @param factory the factory to set
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*/
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public synchronized static void setInstance(SurfaceManagerFactory factory) {
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if (factory == null) {
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// We don't want to allow setting this to null at any time.
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throw new IllegalArgumentException("factory must be non-null");
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}
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if (instance != null) {
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// We don't want to re-set the instance at any time.
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throw new IllegalStateException("The surface manager factory is already initialized");
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}
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instance = factory;
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}
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/**
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* Creates a new instance of a VolatileSurfaceManager given any
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* arbitrary SunVolatileImage. An optional context Object can be supplied
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* as a way for the caller to pass pipeline-specific context data to
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* the VolatileSurfaceManager (such as a backbuffer handle, for example).
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*/
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public abstract VolatileSurfaceManager
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createVolatileManager(SunVolatileImage image, Object context);
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}
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