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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/java/awt/image/Kernel.java | |
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Diffstat (limited to 'libjava/classpath/java/awt/image/Kernel.java')
-rw-r--r-- | libjava/classpath/java/awt/image/Kernel.java | 171 |
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 + } + } +} |