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/* Kernel.java -- Java class for an image processing kernel

   Copyright (C) 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.image;

/**

 * Kernel represents an image processing kernel.  It gets used to hold

 * convolution filters among other purposes.  It stores an array of float

 * values representing a 2-dimensional array in row-major order.

 *

 * @author Jerry Quinn (jlquinn@optonline.net)

 * @version 1.0

 */

public class Kernel implements Cloneable

{

  private final int width;

  private final int height;

  private final float[] data;

  /**

   * Creates a new <code>Kernel</code> instance.

   *

   * @param width The 2D width of data.

   * @param height The 2D height of data.

   * @param data The source data array.

   * @exception IllegalArgumentException if width * height < data.length.

   */

  public Kernel(int width, int height, float[] data)

    throws IllegalArgumentException

  {

    this.width = width;

    this.height = height;

    if (data.length < width * height || width < 0 || height < 0)

      throw new IllegalArgumentException();

    this.data = new float[width * height];

    System.arraycopy(data, 0, this.data, 0, width * height);

  }

  /**

   * Return the X origin: (width - 1) / 2

   */

  public final int getXOrigin()

  {

    return (width - 1) / 2;

  }

  /**

   * Return the Y origin: (height - 1) / 2

   */

  public final int getYOrigin()

  {

    return (height - 1) / 2;

  }

  /**

   * @return The kernel width.

   */

  public final int getWidth()

  {

    return width;

  }

  /**

   * @return The kernel height.

   */

  public final int getHeight()

  {

    return height;

  }

  /**

   * Return the kernel data.

   *

   * If data is null, allocates a new array and returns it.  Otherwise, the

   * kernel values are copied into data.

   *

   * @param data Array to copy values into, or null.

   * @return The array with copied values.

   * @exception IllegalArgumentException if data != null and too small.

   */

  public final float[] getKernelData(float[] data)

    throws IllegalArgumentException

  {

    if (data == null)

      return (float[])this.data.clone();

    if (data.length < this.data.length)

      throw new IllegalArgumentException();

    System.arraycopy(this.data, 0, data, 0, this.data.length);

    return data;

  }

  /**

   * @return a clone of this Kernel.

   */

  public Object clone()

  {

    try

      {

        return super.clone();

      }

    catch (CloneNotSupportedException e)

      {

        throw (Error) new InternalError().initCause(e); // Impossible

      }

  }

}