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downloading a git-generated archive based on the 'upstream' tag
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1 files changed, 171 insertions, 0 deletions

diff --git a/libjava/classpath/java/awt/image/Kernel.java b/libjava/classpath/java/awt/image/Kernel.java
new file mode 100644
index 000000000..ae0ff1469
--- /dev/null
+++ b/libjava/classpath/java/awt/image/Kernel.java
@@ -0,0 +1,171 @@
+/* Kernel.java -- Java class for an image processing kernel
+   Copyright (C) 2004, 2005, 2006,  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)
+ */
+public class Kernel implements Cloneable
+{
+  /** The kernel width. */
+  private final int width;
+
+  /** The kernel height. */
+  private final int height;
+
+  /** Internal storage for the kernel's values. */
+  private final float[] data;
+
+  /**
+   * Creates a new <code>Kernel</code> instance with the specified dimensions
+   * and values.  The first <code>width * height</code> values in the specified
+   * <code>data</code> array are copied to internal storage.
+   *
+   * @param width  the kernel width.
+   * @param height  the kernel height.
+   * @param data  the source data array (<code>null</code> not permitted).
+   *
+   * @throws IllegalArgumentException if <code>data.length</code> is less than
+   *     <code>width * height</code>.
+   * @throws IllegalArgumentException if <code>width</code> or
+   *      <code>height</code> is less than zero.
+   * @throws NullPointerException if <code>data</code> is <code>null</code>.
+   */
+  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);
+  }
+
+  /**
+   * Returns the x-origin for the kernel, which is calculated as
+   * <code>(width - 1) / 2</code>.
+   *
+   * @return The x-origin for the kernel.
+   */
+  public final int getXOrigin()
+  {
+    return (width - 1) / 2;
+  }
+
+  /**
+   * Returns the y-origin for the kernel, which is calculated as
+   * <code>(height - 1) / 2</code>.
+   *
+   * @return The y-origin for the kernel.
+   */
+  public final int getYOrigin()
+  {
+    return (height - 1) / 2;
+  }
+
+  /**
+   * Returns the kernel width (as supplied to the constructor).
+   *
+   * @return The kernel width.
+   */
+  public final int getWidth()
+  {
+    return width;
+  }
+
+  /**
+   * Returns the kernel height (as supplied to the constructor).
+   *
+   * @return The kernel height.
+   */
+  public final int getHeight()
+  {
+    return height;
+  }
+
+  /**
+   * Returns an array containing a copy of the kernel data.  If the
+   * <code>data</code> argument is non-<code>null</code>, the kernel values
+   * are copied into it and then <code>data</code> is returned as the result.
+   * If the <code>data</code> argument is <code>null</code>, this method
+   * allocates a new array then populates and returns it.
+   *
+   * @param data  an array to copy the return values into (if
+   *     <code>null</code>, a new array is allocated).
+   *
+   * @return The array with copied values.
+   *
+   * @throws IllegalArgumentException if <code>data.length</code> is less than
+   *     the kernel's <code>width * height</code>.
+   */
+  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;
+  }
+
+  /**
+   * Returns a clone of this kernel.
+   *
+   * @return a clone of this Kernel.
+   */
+  public Object clone()
+  {
+    try
+      {
+        return super.clone();
+      }
+    catch (CloneNotSupportedException e)
+      {
+        throw (Error) new InternalError().initCause(e); // Impossible
+      }
+  }
+}