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1 files changed, 226 insertions, 0 deletions

diff --git a/libjava/classpath/java/awt/image/ImageFilter.java b/libjava/classpath/java/awt/image/ImageFilter.java
new file mode 100644
index 000000000..10df82e25
--- /dev/null
+++ b/libjava/classpath/java/awt/image/ImageFilter.java
@@ -0,0 +1,226 @@
+/* ImageFilter.java -- Java class for filtering images
+   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.util.Hashtable;
+
+/**
+ * The <code>ImageFilter</code> class is a base class which can be
+ * extended to provide different types of filters for an image.  By
+ * default this class does nothing to an image passing through it.
+ *
+ * @author C. Brian Jones (cbj@gnu.org)
+ */
+public class ImageFilter implements ImageConsumer, Cloneable
+{
+  /**
+   * The consumer this filter is filtering an image data stream for.
+   * It is initialized in the method <code>getFilterInstance</code>.
+   */
+  protected ImageConsumer consumer = null;
+
+  /**
+   * The <code>ImageConsumer</code> can use this method to request
+   * the pixels be delivered in top-down, left-right order.
+   * <br>
+   * The filter can respond in three different ways.
+   * <ul>
+   *   <li>The default behavior is to forward the request to the
+   *       <code>ImageProducer</code>
+   *       using the method <code>requestTopDownLeftRightResend</code>
+   *       and using the filter as the consumer.</li>
+   *   <li>The filter has the pixels and can retransmit them in the
+   *       top-down, left-right order.</li>
+   *   <li>The filter can do nothing when this method is called.</li>
+   * </ul>
+   */
+  public void resendTopDownLeftRight(ImageProducer ip)
+  {
+    ip.requestTopDownLeftRightResend(this);
+  }
+
+  /**
+   * By default, returns a shallow copy of the object created by
+   * <code>Object.clone()</code>
+   *
+   * @see java.lang.Object#clone ()
+   */
+  public Object clone()
+  {
+    try
+      {
+        return super.clone();
+      }
+    catch (CloneNotSupportedException e)
+      {
+        // This should never happen as this class implements the
+        // Cloneable interface.
+        throw new InternalError ();
+      }
+  }
+
+  /**
+   * This is the only method which can set the
+   * <code>ImageConsumer</code> for this filter.  By default a clone
+   * of this filter with the appropriate consumer set is returned.
+   *
+   * @see #clone ()
+   */
+  public ImageFilter getFilterInstance(ImageConsumer ic)
+  {
+    ImageFilter f = (ImageFilter)clone();
+    f.consumer = ic;
+    return f;
+  }
+
+  /**
+   * An <code>ImageProducer</code> indicates the size of the image
+   * being produced using this method.  A filter can override this
+   * method to intercept these calls from the producer in order to
+   * change either the width or the height before in turn calling
+   * the consumer's <code>setDimensions</code> method.
+   *
+   * @param width the width of the image
+   * @param height the height of the image
+   */
+  public void setDimensions(int width, int height)
+  {
+    consumer.setDimensions(width, height);
+  }
+
+  /**
+   * An <code>ImageProducer</code> can set a list of properties
+   * associated with this image by using this method.
+   *
+   * @param props the list of properties associated with this image
+   */
+  public void setProperties(Hashtable<?,?> props)
+  {
+    Hashtable copy = (Hashtable) props.clone();
+    Object o = copy.get("filters");
+    if (o == null)
+      copy.put("filters", toString());
+    else if (o instanceof String)
+      copy.put("filters", ((String) o) + toString());
+
+    consumer.setProperties(copy);
+  }
+
+  /**
+   * Override this method to process calls to this method from the
+   * <code>ImageProducer</code>.  By default the <code>setColorModel</code>
+   * method of the consumer is called with the specified <code>model</code>.
+   *
+   * @param model the color model to be used most often by setPixels
+   *
+   * @see ColorModel
+   */
+  public void setColorModel(ColorModel model)
+  {
+    consumer.setColorModel(model);
+  }
+
+  /**
+   * The <code>ImageProducer</code> should call this method with a
+   * bit mask of hints from any of <code>RANDOMPIXELORDER</code>,
+   * <code>TOPDOWNLEFTRIGHT</code>, <code>COMPLETESCANLINES</code>,
+   * <code>SINGLEPASS</code>, <code>SINGLEFRAME</code> from the
+   * <code>ImageConsumer</code> interface.
+   *
+   * @param flags a bit mask of hints
+   * @see ImageConsumer
+   */
+  public void setHints(int flags)
+  {
+    consumer.setHints(flags);
+  }
+
+  /**
+   * This function delivers a rectangle of pixels where any
+   * pixel(m,n) is stored in the array as a <code>byte</code> at
+   * index (n * scansize + m + offset).
+   *
+   * @param x the x coordinate of the rectangle
+   * @param y the y coordinate of the rectangle
+   * @param w the width of the rectangle
+   * @param h the height of the rectangle
+   * @param model the <code>ColorModel</code> used to translate the pixels
+   * @param pixels the array of pixel values
+   * @param offset the index of the first pixels in the <code>pixels</code> array
+   * @param scansize the width to use in extracting pixels from the <code>pixels</code> array
+   */
+  public void setPixels(int x, int y, int w, int h,
+                        ColorModel model, byte[] pixels, int offset,
+                        int scansize)
+  {
+    consumer.setPixels(x, y, w, h, model, pixels, offset, scansize);
+  }
+
+  /**
+   * This function delivers a rectangle of pixels where any
+   * pixel(m,n) is stored in the array as an <code>int</code> at
+   * index (n * scansize + m + offset).
+   *
+   * @param x the x coordinate of the rectangle
+   * @param y the y coordinate of the rectangle
+   * @param w the width of the rectangle
+   * @param h the height of the rectangle
+   * @param model the <code>ColorModel</code> used to translate the pixels
+   * @param pixels the array of pixel values
+   * @param offset the index of the first pixels in the <code>pixels</code> array
+   * @param scansize the width to use in extracting pixels from the <code>pixels</code> array
+   */
+  public void setPixels(int x, int y, int w, int h,
+                        ColorModel model, int[] pixels, int offset,
+                        int scansize)
+  {
+    consumer.setPixels(x, y, w, h, model, pixels, offset, scansize);
+  }
+
+  /**
+   * The <code>ImageProducer</code> calls this method to indicate a
+   * single frame or the entire image is complete.  The method is
+   * also used to indicate an error in loading or producing the
+   * image.
+   */
+  public void imageComplete(int status)
+  {
+    consumer.imageComplete(status);
+  }
+}