001/* Composite.java -- graphics formed from composite layers
002   Copyright (C) 2002, 2005  Free Software Foundation, Inc.
003
004This file is part of GNU Classpath.
005
006GNU Classpath is free software; you can redistribute it and/or modify
007it under the terms of the GNU General Public License as published by
008the Free Software Foundation; either version 2, or (at your option)
009any later version.
010
011GNU Classpath is distributed in the hope that it will be useful, but
012WITHOUT ANY WARRANTY; without even the implied warranty of
013MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014General Public License for more details.
015
016You should have received a copy of the GNU General Public License
017along with GNU Classpath; see the file COPYING.  If not, write to the
018Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
01902110-1301 USA.
020
021Linking this library statically or dynamically with other modules is
022making a combined work based on this library.  Thus, the terms and
023conditions of the GNU General Public License cover the whole
024combination.
025
026As a special exception, the copyright holders of this library give you
027permission to link this library with independent modules to produce an
028executable, regardless of the license terms of these independent
029modules, and to copy and distribute the resulting executable under
030terms of your choice, provided that you also meet, for each linked
031independent module, the terms and conditions of the license of that
032module.  An independent module is a module which is not derived from
033or based on this library.  If you modify this library, you may extend
034this exception to your version of the library, but you are not
035obligated to do so.  If you do not wish to do so, delete this
036exception statement from your version. */
037
038
039package java.awt;
040
041import java.awt.image.ColorModel;
042
043/**
044 * This interface is for graphics which are formed as composites of others.
045 * It combines {@link Graphics2D} shapes according to defined rules to form
046 * the new image. Implementations of this interface must be immutable, because
047 * they are not cloned when a Graphics2D container is cloned.
048 *
049 * <p>Since this can expose pixels to untrusted code, there is a security
050 * check on custom objects, <code>readDisplayPixels</code>, to prevent leaking
051 * restricted information graphically.
052 *
053 * @author Eric Blake (ebb9@email.byu.edu)
054 * @see AlphaComposite
055 * @see CompositeContext
056 * @see Graphics2D#setComposite(Composite)
057 * @since 1.2
058 * @status updated to 1.4
059 */
060public interface Composite
061{
062  /**
063   * Create a context state for performing the compositing operation. Several
064   * contexts may exist for this object, in a multi-threaded environment.
065   *
066   * @param srcColorModel the color model of the source
067   * @param dstColorModel the color model of the destination
068   * @param hints hints for choosing between rendering alternatives
069   */
070  CompositeContext createContext(ColorModel srcColorModel,
071                                 ColorModel dstColorModel,
072                                 RenderingHints hints);
073} // interface Composite