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jeremybenn |
/* ImageFilter.java -- Java class for filtering images
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Copyright (C) 1999 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.awt.image;
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import java.util.Hashtable;
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/**
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* The <code>ImageFilter</code> class is a base class which can be
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* extended to provide different types of filters for an image. By
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* default this class does nothing to an image passing through it.
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*
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* @author C. Brian Jones (cbj@gnu.org)
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*/
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public class ImageFilter implements ImageConsumer, Cloneable
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{
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/**
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* The consumer this filter is filtering an image data stream for.
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* It is initialized in the method <code>getFilterInstance</code>.
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*/
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protected ImageConsumer consumer = null;
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/**
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* The <code>ImageConsumer</code> can use this method to request
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* the pixels be delivered in top-down, left-right order.
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* <br>
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* The filter can respond in three different ways.
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* <ul>
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* <li>The default behavior is to forward the request to the
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* <code>ImageProducer</code>
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* using the method <code>requestTopDownLeftRightResend</code>
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* and using the filter as the consumer.</li>
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* <li>The filter has the pixels and can retransmit them in the
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* top-down, left-right order.</li>
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* <li>The filter can do nothing when this method is called.</li>
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* </ul>
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*/
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public void resendTopDownLeftRight(ImageProducer ip)
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{
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ip.requestTopDownLeftRightResend(this);
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}
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/**
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* By default, returns a shallow copy of the object created by
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* <code>Object.clone()</code>
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*
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* @see java.lang.Object#clone ()
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*/
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public Object clone()
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{
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try
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{
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return super.clone();
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}
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catch (CloneNotSupportedException e)
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{
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// This should never happen as this class implements the
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// Cloneable interface.
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throw new InternalError ();
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}
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}
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/**
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* This is the only method which can set the
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* <code>ImageConsumer</code> for this filter. By default a clone
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* of this filter with the appropriate consumer set is returned.
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*
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* @see #clone ()
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*/
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public ImageFilter getFilterInstance(ImageConsumer ic)
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{
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ImageFilter f = (ImageFilter)clone();
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f.consumer = ic;
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return f;
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}
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/**
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* An <code>ImageProducer</code> indicates the size of the image
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* being produced using this method. A filter can override this
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* method to intercept these calls from the producer in order to
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* change either the width or the height before in turn calling
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* the consumer's <code>setDimensions</code> method.
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*
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* @param width the width of the image
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* @param height the height of the image
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*/
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public void setDimensions(int width, int height)
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{
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consumer.setDimensions(width, height);
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}
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/**
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* An <code>ImageProducer</code> can set a list of properties
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* associated with this image by using this method.
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*
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* @param props the list of properties associated with this image
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*/
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public void setProperties(Hashtable<?,?> props)
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{
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Hashtable copy = (Hashtable) props.clone();
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Object o = copy.get("filters");
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if (o == null)
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copy.put("filters", toString());
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else if (o instanceof String)
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copy.put("filters", ((String) o) + toString());
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consumer.setProperties(copy);
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}
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/**
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* Override this method to process calls to this method from the
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* <code>ImageProducer</code>. By default the <code>setColorModel</code>
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* method of the consumer is called with the specified <code>model</code>.
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*
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* @param model the color model to be used most often by setPixels
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*
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* @see ColorModel
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*/
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public void setColorModel(ColorModel model)
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{
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consumer.setColorModel(model);
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}
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/**
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* The <code>ImageProducer</code> should call this method with a
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* bit mask of hints from any of <code>RANDOMPIXELORDER</code>,
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* <code>TOPDOWNLEFTRIGHT</code>, <code>COMPLETESCANLINES</code>,
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* <code>SINGLEPASS</code>, <code>SINGLEFRAME</code> from the
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* <code>ImageConsumer</code> interface.
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*
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* @param flags a bit mask of hints
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* @see ImageConsumer
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*/
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public void setHints(int flags)
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{
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consumer.setHints(flags);
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}
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/**
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* This function delivers a rectangle of pixels where any
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* pixel(m,n) is stored in the array as a <code>byte</code> at
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* index (n * scansize + m + offset).
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*
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* @param x the x coordinate of the rectangle
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* @param y the y coordinate of the rectangle
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* @param w the width of the rectangle
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* @param h the height of the rectangle
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* @param model the <code>ColorModel</code> used to translate the pixels
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* @param pixels the array of pixel values
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* @param offset the index of the first pixels in the <code>pixels</code> array
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* @param scansize the width to use in extracting pixels from the <code>pixels</code> array
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*/
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public void setPixels(int x, int y, int w, int h,
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ColorModel model, byte[] pixels, int offset,
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int scansize)
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{
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consumer.setPixels(x, y, w, h, model, pixels, offset, scansize);
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}
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/**
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* This function delivers a rectangle of pixels where any
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* pixel(m,n) is stored in the array as an <code>int</code> at
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* index (n * scansize + m + offset).
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*
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* @param x the x coordinate of the rectangle
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* @param y the y coordinate of the rectangle
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* @param w the width of the rectangle
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* @param h the height of the rectangle
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* @param model the <code>ColorModel</code> used to translate the pixels
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* @param pixels the array of pixel values
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* @param offset the index of the first pixels in the <code>pixels</code> array
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* @param scansize the width to use in extracting pixels from the <code>pixels</code> array
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*/
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public void setPixels(int x, int y, int w, int h,
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ColorModel model, int[] pixels, int offset,
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int scansize)
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{
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consumer.setPixels(x, y, w, h, model, pixels, offset, scansize);
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}
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/**
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* The <code>ImageProducer</code> calls this method to indicate a
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* single frame or the entire image is complete. The method is
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* also used to indicate an error in loading or producing the
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* image.
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*/
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public void imageComplete(int status)
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{
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consumer.imageComplete(status);
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}
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}
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