001 /* ImageProducer.java -- Java interface for image production
002 Copyright (C) 1999 Free Software Foundation, Inc.
003
004 This file is part of GNU Classpath.
005
006 GNU Classpath is free software; you can redistribute it and/or modify
007 it under the terms of the GNU General Public License as published by
008 the Free Software Foundation; either version 2, or (at your option)
009 any later version.
010
011 GNU Classpath is distributed in the hope that it will be useful, but
012 WITHOUT ANY WARRANTY; without even the implied warranty of
013 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
014 General Public License for more details.
015
016 You should have received a copy of the GNU General Public License
017 along with GNU Classpath; see the file COPYING. If not, write to the
018 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
019 02110-1301 USA.
020
021 Linking this library statically or dynamically with other modules is
022 making a combined work based on this library. Thus, the terms and
023 conditions of the GNU General Public License cover the whole
024 combination.
025
026 As a special exception, the copyright holders of this library give you
027 permission to link this library with independent modules to produce an
028 executable, regardless of the license terms of these independent
029 modules, and to copy and distribute the resulting executable under
030 terms of your choice, provided that you also meet, for each linked
031 independent module, the terms and conditions of the license of that
032 module. An independent module is a module which is not derived from
033 or based on this library. If you modify this library, you may extend
034 this exception to your version of the library, but you are not
035 obligated to do so. If you do not wish to do so, delete this
036 exception statement from your version. */
037
038
039 package java.awt.image;
040
041 /**
042 * An object implementing the <code>ImageProducer</code> interface can
043 * produce data for images. Each image has a corresponding
044 * <code>ImageProducer</code> which is needed for things such as
045 * resizing the image.
046 *
047 * @see ImageConsumer
048 * @author C. Brian Jones (cbj@gnu.org)
049 */
050 public interface ImageProducer
051 {
052 /**
053 * Used to register an <code>ImageConsumer</code> with this
054 * <code>ImageProducer</code>.
055 */
056 void addConsumer(ImageConsumer ic);
057
058 /**
059 * Used to determine if the given <code>ImageConsumer</code> is
060 * already registered with this <code>ImageProducer</code>.
061 */
062 boolean isConsumer(ImageConsumer ic);
063
064 /**
065 * Used to remove an <code>ImageConsumer</code> from the list of
066 * registered consumers for this <code>ImageProducer</code>.
067 */
068 void removeConsumer(ImageConsumer ic);
069
070 /**
071 * Used to register an <code>ImageConsumer</code> with this
072 * <code>ImageProducer</code> and then immediately start
073 * reconstruction of the image data to be delivered to all
074 * registered consumers.
075 */
076 void startProduction(ImageConsumer ic);
077
078 /**
079 * Used to register an <code>ImageConsumer</code> with this
080 * <code>ImageProducer</code> and then request that this producer
081 * resend the image data in the order top-down, left-right.
082 */
083 void requestTopDownLeftRightResend(ImageConsumer ic);
084 }