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+/* Image.java -- superclass for images
+   Copyright (C) 1999, 2002, 2004, 2005  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;
+
+import java.awt.image.FilteredImageSource;
+import java.awt.image.ImageObserver;
+import java.awt.image.ImageProducer;
+import java.awt.image.ReplicateScaleFilter;
+
+/**
+ * This is the abstract superclass of all image objects in Java.
+ *
+ * @author Aaron M. Renn (arenn@urbanophile.com)
+ * @since 1.0
+ * @status updated to 1.4
+ */
+public abstract class Image
+{
+  /**
+   * This variable is returned whenever a property that is not defined
+   * is requested.
+   */
+  // For debug purposes, this might as well be a unique string.
+  public static final Object UndefinedProperty
+    = new String("undefined property");
+
+  /**
+   * Constant indicating that the default scaling algorithm should be used.
+   *
+   * @since 1.1
+   */
+  public static final int SCALE_DEFAULT = 1;
+
+  /**
+   * Constant indicating that a fast scaling algorithm should be used.
+   *
+   * @since 1.1
+   */
+  public static final int SCALE_FAST = 2;
+
+  /**
+   * Constant indicating that a smooth scaling algorithm should be used.
+   *
+   * @since 1.1
+   */
+  public static final int SCALE_SMOOTH = 4;
+
+  /**
+   * Constant indicating that the <code>ReplicateScaleFilter</code> class
+   * algorithm should be used for scaling.
+   *
+   * @see ReplicateScaleFilter
+   * @since 1.1
+   */
+  public static final int SCALE_REPLICATE = 8;
+
+  /**
+   * Constant indicating that the area averaging scaling algorithm should be
+   * used.
+   *
+   * @see java.awt.image.AreaAveragingScaleFilter
+   * @since 1.1
+   */
+  public static final int SCALE_AREA_AVERAGING = 16;
+
+  /**
+   * A default constructor for subclasses.
+   */
+  public Image()
+  {
+  }
+
+  /**
+   * Returns the width of the image, or -1 if it is unknown.  If the
+   * image width is unknown, the observer object will be notified when
+   * the value is known.
+   *
+   * @param observer the image observer for this object
+   * @return the width in pixels
+   * @see #getHeight(ImageObserver)
+   */
+  public abstract int getWidth(ImageObserver observer);
+
+  /**
+   * Returns the height of the image, or -1 if it is unknown.  If the
+   * image height is unknown, the observer object will be notified when
+   * the value is known.
+   *
+   * @param observer the image observer for this object
+   * @return the height in pixels
+   * @see #getWidth(ImageObserver)
+   */
+  public abstract int getHeight(ImageObserver observer);
+
+  /**
+   * Returns the image producer object for this object. The producer is the
+   * object which generates pixels for this image.
+   *
+   * @return the image producer for this object
+   */
+  public abstract ImageProducer getSource();
+
+  /**
+   * Returns a graphics context object for drawing an off-screen object.
+   * This method is only valid for off-screen objects.
+   *
+   * @return a graphics context object for an off-screen object
+   * @see Graphics#getcreateImage(int, int)
+   */
+  public abstract Graphics getGraphics();
+
+  /**
+   * This method requests a named property for an object.  The value of the
+   * property is returned. The value <code>UndefinedProperty</code> is
+   * returned if there is no property with the specified name.  The value
+   * <code>null</code> is returned if the properties for the object are
+   * not yet known.  In this case, the specified image observer is notified
+   * when the properties are known.
+   *
+   * @param name the requested property name
+   * @param observer the image observer for this object
+   * @return the named property, if available
+   * @see #UndefinedProperty
+   */
+  public abstract Object getProperty(String name, ImageObserver observer);
+
+  /**
+   * Scales the image to the requested dimension. A new Image with asynchronous
+   * loading will be produced according to the hints of the algorithm
+   * requested. If either the width or height is non-positive, it is adjusted
+   * to preserve the original aspect ratio.
+   *
+   * @param width the width of the scaled image
+   * @param height the height of the scaled image
+   * @param flags a value indicating the algorithm to use
+   * @return the scaled <code>Image</code> object
+   * @see #SCALE_DEFAULT
+   * @see #SCALE_FAST
+   * @see #SCALE_SMOOTH
+   * @see #SCALE_REPLICATE
+   * @see #SCALE_AREA_AVERAGING
+   * @since 1.1
+   */
+  public Image getScaledInstance(int width, int height, int flags)
+  {
+    switch (flags)
+    {
+      case SCALE_DEFAULT:
+      case SCALE_FAST:
+      case SCALE_REPLICATE:
+        ImageProducer producer =
+          new FilteredImageSource(this.getSource(),
+                                  new ReplicateScaleFilter(width, height));
+        return Toolkit.getDefaultToolkit().createImage(producer);
+      case SCALE_SMOOTH:
+      case SCALE_AREA_AVERAGING:
+      default:
+        throw new Error("not implemented");
+    }
+  }
+
+  /**
+   * Flushes (that is, destroys) any resources used for this image.  This
+   * includes the actual image data.
+   */
+  public abstract void flush();
+} // class Image