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[pf3gnuchains/gcc-fork.git] / libjava / classpath / java / awt / image / ImageProducer.java

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+/* ImageProducer.java -- Java interface for image production
+   Copyright (C) 1999 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;
+
+/**
+ * An object implementing the <code>ImageProducer</code> interface can
+ * produce data for images.  Each image has a corresponding
+ * <code>ImageProducer</code> which is needed for things such as
+ * resizing the image.
+ *
+ * @see ImageConsumer
+ * @author C. Brian Jones (cbj@gnu.org) 
+ */
+public interface ImageProducer
+{
+    /**
+     * Used to register an <code>ImageConsumer</code> with this
+     * <code>ImageProducer</code>.  
+     */
+    void addConsumer(ImageConsumer ic);
+
+    /**
+     * Used to determine if the given <code>ImageConsumer</code> is
+     * already registered with this <code>ImageProducer</code>.  
+     */
+    boolean isConsumer(ImageConsumer ic);
+
+    /**
+     * Used to remove an <code>ImageConsumer</code> from the list of
+     * registered consumers for this <code>ImageProducer</code>.  
+     */
+    void removeConsumer(ImageConsumer ic);
+
+    /**
+     * Used to register an <code>ImageConsumer</code> with this
+     * <code>ImageProducer</code> and then immediately start
+     * reconstruction of the image data to be delivered to all
+     * registered consumers.  
+     */
+    void startProduction(ImageConsumer ic);
+
+    /**
+     * Used to register an <code>ImageConsumer</code> with this
+     * <code>ImageProducer</code> and then request that this producer
+     * resend the image data in the order top-down, left-right.  
+     */
+    void requestTopDownLeftRightResend(ImageConsumer ic);
+}
+