Initial revision

From-SVN: r102074

libjava/classpath/java/awt/image/ImageObserver.java

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+/* ImageObserver.java -- Java interface for asynchronous updates to an image
+   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;
+
+import java.awt.Image;
+
+/**
+ * An object implementing the <code>ImageObserver</code> interface can
+ * receive updates on image construction from an
+ * <code>ImageProducer</code> asynchronously.
+ *
+ * @see ImageProducer
+ * @author C. Brian Jones (cbj@gnu.org) 
+ */
+public interface ImageObserver
+{
+    /**
+     * The width of the image has been provided as the
+     * <code>width</code> argument to <code>imageUpdate</code>.
+     *
+     * @see #imageUpdate 
+     */
+    int WIDTH = 1;
+
+    /**
+     * The height of the image has been provided as the
+     * <code>height</code> argument to <code>imageUpdate</code>.
+     *
+     * @see #imageUpdate 
+     */
+    int HEIGHT = 2;
+
+    /**
+     * The properties of the image have been provided.
+     *
+     * @see #imageUpdate
+     * @see java.awt.Image#getProperty (java.lang.String, java.awt.image.ImageObserver)
+     */
+    int PROPERTIES = 4;
+
+    /**
+     * More pixels are now available for drawing a scaled variation of
+     * the image.
+     *
+     * @see #imageUpdate 
+     */
+    int SOMEBITS = 8;
+
+    /**
+     * All the pixels needed to draw a complete frame of a multi-frame
+     * image are available.
+     *
+     * @see #imageUpdate 
+     */
+    int FRAMEBITS = 16;
+
+    /**
+     * An image with a single frame, a static image, is complete.
+     *
+     * @see #imageUpdate
+     */
+    int ALLBITS = 32;
+
+    /**
+     * An error was encountered while producing the image.
+     *
+     * @see #imageUpdate
+     */
+    int ERROR = 64;
+
+    /**
+     * Production of the image was aborted.
+     *
+     * @see #imageUpdate
+     */
+    int ABORT = 128;
+
+    /**
+     * This is a callback method for an asynchronous image producer to
+     * provide updates on the production of the image as it happens.
+     *
+     * @param image the image the update refers to
+     * @param flags a bit mask indicating what is provided with this update
+     * @param x the x coordinate of the image
+     * @param y the y coordinate of the image
+     * @param width the width of the image
+     * @param height the height of the image
+     * 
+     * @see java.awt.Image 
+     */
+    boolean imageUpdate(Image image, int flags, int x, 
+					int y, int width, int height);
+}