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diff --git a/awt/java/awt/image/ImageObserver.java b/awt/java/awt/image/ImageObserver.java
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+/*
+ *  Licensed to the Apache Software Foundation (ASF) under one or more
+ *  contributor license agreements.  See the NOTICE file distributed with
+ *  this work for additional information regarding copyright ownership.
+ *  The ASF licenses this file to You under the Apache License, Version 2.0
+ *  (the "License"); you may not use this file except in compliance with
+ *  the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+/**
+ * @author Igor V. Stolyarov
+ * @version $Revision$
+ */
+package java.awt.image;
+
+import java.awt.Image;
+
+/**
+ * the ImageObserver interface is an asynchronous update interface 
+ * for receiving notifications about Image construction status.
+ */
+public interface ImageObserver {
+
+    /** 
+     * The Constant WIDTH indicates that the width of the image is 
+     * available. 
+     */
+    public static final int WIDTH = 1;
+
+    /** 
+     * The Constant HEIGHT indicates that the width of the image is 
+     * available.
+     */
+    public static final int HEIGHT = 2;
+
+    /** 
+     * The Constant PROPERTIES indicates that the properties of the image
+     * are available. 
+     */
+    public static final int PROPERTIES = 4;
+
+    /**
+     *  The Constant SOMEBITS indicates that more bits needed for 
+     *  drawing a scaled variation of the image pixels are available.
+     */
+    public static final int SOMEBITS = 8;
+
+    /** 
+     * The Constant FRAMEBITS indicates that complete frame of 
+     * a image which was previously drawn is now available
+     * for drawing again. 
+     */
+    public static final int FRAMEBITS = 16;
+
+    /** 
+     * The Constant ALLBITS indicates that an image which 
+     * was previously drawn is now complete and can be drawn again. 
+     */
+    public static final int ALLBITS = 32;
+
+    /** 
+     * The Constant ERROR indicates that error occured. 
+     */
+    public static final int ERROR = 64;
+
+    /** 
+     * The Constant ABORT indicates that the image producing is 
+     * aborted.
+     */
+    public static final int ABORT = 128;
+
+    /**
+     * This method is called when information about an Image
+     * interface becomes available. This method returns true 
+     * if further updates are needed, false if not.
+     * 
+     * @param img the image to be observed.
+     * @param infoflags the bitwise OR combination of information flags:
+     * ABORT, ALLBITS, ERROR, FRAMEBITS, HEIGHT, PROPERTIES, SOMEBITS, 
+     * WIDTH.
+     * @param x the X coordinate.
+     * @param y the Y coordinate.
+     * @param width the width.
+     * @param height the height.
+     * 
+     * @return true if further updates are needed, false if not.
+     */
+    public boolean imageUpdate(Image img, int infoflags, int x, int y,
+            int width, int height);
+
+}
+