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-/* BufferStrategy.java -- describes image buffering resources
- Copyright (C) 2002, 2005 Free Software Foundation, Inc.
-
-This file is part of GNU Classpath.
-
-GNU Classpath is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2, or (at your option)
-any later version.
-
-GNU Classpath 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 for more details.
-
-You should have received a copy of the GNU General Public License
-along with GNU Classpath; see the file COPYING. If not, write to the
-Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
-02110-1301 USA.
-
-Linking this library statically or dynamically with other modules is
-making a combined work based on this library. Thus, the terms and
-conditions of the GNU General Public License cover the whole
-combination.
-
-As a special exception, the copyright holders of this library give you
-permission to link this library with independent modules to produce an
-executable, regardless of the license terms of these independent
-modules, and to copy and distribute the resulting executable under
-terms of your choice, provided that you also meet, for each linked
-independent module, the terms and conditions of the license of that
-module. An independent module is a module which is not derived from
-or based on this library. If you modify this library, you may extend
-this exception to your version of the library, but you are not
-obligated to do so. If you do not wish to do so, delete this
-exception statement from your version. */
-
-
-package java.awt.image;
-
-import java.awt.BufferCapabilities;
-import java.awt.Graphics;
-
-/**
- * This class describes a strategy for managing image buffering
- * resources on a Canvas or Window. A given buffer strategy may make
- * use of hardware acceleration or take advantage of features of the
- * native graphics system. Examples of buffering strategies are
- * double or triple buffering using either flipping or blitting. For
- * the details of these algorithms see BufferCapabilities.
- *
- * To use a buffer strategy, you retrieve it from either the current
- * GraphicsConfiguration or from the Component on which you'd like to
- * draw. Then you can query the strategy's capabilities to make sure
- * they're suitable.
- *
- * If the strategy's capabilities are suitable, you can obtain a
- * graphics object and use it to draw with this strategy. Drawing
- * with a buffer strategy requires extra care, however. You'll need
- * to manually cause the next buffer to be shown on the output device.
- * And since buffer strategies are usually implemented with a
- * VolatileImage, you must frequently check that the contents of the
- * buffer are valid and that the buffer still exists.
- *
- * A buffer strategy is usually implemented using a VolatileImage.
- *
- * @see VolatileImage
- * @since 1.4
- */
-public abstract class BufferStrategy
-{
- /**
- * Creates a new buffer strategy.
- */
- public BufferStrategy()
- {
- }
-
- /**
- * Retrieves the capabilities of this buffer strategy.
- *
- * @return this buffer strategy's capabilities
- */
- public abstract BufferCapabilities getCapabilities();
-
- /**
- * Retrieves a graphics object that can be used to draw using this
- * buffer strategy. This method may not be synchronized so be
- * careful when calling it from multiple threads. You also must
- * manually dispose of this graphics object.
- *
- * @return a graphics object that can be used to draw using this
- * buffer strategy
- */
- public abstract Graphics getDrawGraphics();
-
- /**
- * Returns whether or not the buffer's resources have been reclaimed
- * by the native graphics system. If the buffer resources have been
- * lost then you'll need to obtain new resources before drawing
- * again. For details, see the documentation for VolatileImage.
- *
- * @return true if the contents were lost, false otherwise
- */
- public abstract boolean contentsLost();
-
- /**
- * Returns whether or not the buffer's resources were re-created and
- * cleared to the default background color. If the buffer's
- * resources have recently been re-created and initialized then the
- * buffer's image may need to be re-rendered. For details, see the
- * documentation for VolatileImage.
- *
- * @return true if the contents were restored, false otherwise
- */
- public abstract boolean contentsRestored();
-
- /**
- * Applies this buffer strategy. In other words, this method brings
- * the contents of the back or intermediate buffers to the front
- * buffer.
- */
- public abstract void show();
-}