1 /*
2 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
24 */
25
26 package java.awt.image;
27
28
29 /**
30 * The {@code Kernel} class defines a matrix that describes how a
31 * specified pixel and its surrounding pixels affect the value
32 * computed for the pixel's position in the output image of a filtering
33 * operation. The X origin and Y origin indicate the kernel matrix element
34 * that corresponds to the pixel position for which an output value is
35 * being computed.
36 *
37 * @see ConvolveOp
38 */
39 public class Kernel implements Cloneable {
40 private int width;
41 private int height;
42 private int xOrigin;
43 private int yOrigin;
44 private float data[];
45
46 private static native void initIDs();
47 static {
48 ColorModel.loadLibraries();
49 initIDs();
50 }
51
52 /**
53 * Constructs a {@code Kernel} object from an array of floats.
54 * The first {@code width}*{@code height} elements of
55 * the {@code data} array are copied.
56 * If the length of the {@code data} array is less
57 * than width*height, an {@code IllegalArgumentException} is thrown.
58 * The X origin is (width-1)/2 and the Y origin is (height-1)/2.
59 * @param width width of the kernel
60 * @param height height of the kernel
61 * @param data kernel data in row major order
62 * @throws IllegalArgumentException if the length of {@code data}
63 * is less than the product of {@code width} and
64 * {@code height}
65 */
66 public Kernel(int width, int height, float data[]) {
67 this.width = width;
68 this.height = height;
69 this.xOrigin = (width-1)>>1;
70 this.yOrigin = (height-1)>>1;
71 int len = width*height;
72 if (data.length < len) {
73 throw new IllegalArgumentException("Data array too small "+
74 "(is "+data.length+
75 " and should be "+len);
76 }
77 this.data = new float[len];
78 System.arraycopy(data, 0, this.data, 0, len);
79
80 }
81
82 /**
83 * Returns the X origin of this {@code Kernel}.
84 * @return the X origin.
85 */
86 public final int getXOrigin(){
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1 /*
2 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
24 */
25
26 package java.awt.image;
27
28
29 /**
30 * The {@code Kernel} class defines a matrix that describes how a
31 * specified pixel and its surrounding pixels affect the value
32 * computed for the pixel's position in the output image of a filtering
33 * operation. The X origin and Y origin indicate the kernel matrix element
34 * that corresponds to the pixel position for which an output value is
35 * being computed.
36 *
37 * @see ConvolveOp
38 */
39 public class Kernel implements Cloneable {
40 private int width;
41 private int height;
42 private int xOrigin;
43 private int yOrigin;
44 private float[] data;
45
46 private static native void initIDs();
47 static {
48 ColorModel.loadLibraries();
49 initIDs();
50 }
51
52 /**
53 * Constructs a {@code Kernel} object from an array of floats.
54 * The first {@code width}*{@code height} elements of
55 * the {@code data} array are copied.
56 * If the length of the {@code data} array is less
57 * than width*height, an {@code IllegalArgumentException} is thrown.
58 * The X origin is (width-1)/2 and the Y origin is (height-1)/2.
59 * @param width width of the kernel
60 * @param height height of the kernel
61 * @param data kernel data in row major order
62 * @throws IllegalArgumentException if the length of {@code data}
63 * is less than the product of {@code width} and
64 * {@code height}
65 */
66 public Kernel(int width, int height, float[] data) {
67 this.width = width;
68 this.height = height;
69 this.xOrigin = (width-1)>>1;
70 this.yOrigin = (height-1)>>1;
71 int len = width*height;
72 if (data.length < len) {
73 throw new IllegalArgumentException("Data array too small "+
74 "(is "+data.length+
75 " and should be "+len);
76 }
77 this.data = new float[len];
78 System.arraycopy(data, 0, this.data, 0, len);
79
80 }
81
82 /**
83 * Returns the X origin of this {@code Kernel}.
84 * @return the X origin.
85 */
86 public final int getXOrigin(){
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