001/* ImageProducer.java -- Java interface for image production 002 Copyright (C) 1999 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.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 */ 050public 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} 085