API Overview API Index Package Overview Direct link to this page
JDK 1.6
  java.awt.image. BandCombineOp View Javadoc
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272

/*
 * @(#)BandCombineOp.java	1.41 05/11/30
 *
 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

package java.awt.image;

import java.awt.GraphicsEnvironment;
import java.awt.color.ICC_Profile;
import java.awt.geom.Rectangle2D;
import java.awt.Rectangle;
import java.awt.geom.Point2D;
import java.awt.RenderingHints;
import sun.awt.image.ImagingLib;
import java.util.Arrays;

/**
 * This class performs an arbitrary linear combination of the bands 
 * in a <CODE>Raster</CODE>, using a specified matrix.  
 * <p>
 * The width of the matrix must be equal to the number of bands in the
 * source <CODE>Raster</CODE>, optionally plus one.  If there is one more 
 * column in the matrix than the number of bands, there is an implied 1 at the
 * end of the vector of band samples representing a pixel.  The height
 * of the matrix must be equal to the number of bands in the destination.
 * <p>
 * For example, a 3-banded <CODE>Raster</CODE> might have the following 
 * transformation applied to each pixel in order to invert the second band of 
 * the <CODE>Raster</CODE>.
 * <pre>
 *   [ 1.0   0.0   0.0    0.0  ]     [ b1 ]    
 *   [ 0.0  -1.0   0.0  255.0  ]  x  [ b2 ]
 *   [ 0.0   0.0   1.0    0.0  ]     [ b3 ]
 *                                   [ 1 ]
 * </pre>
 *
 * <p>
 * Note that the source and destination can be the same object.
 * @version 10 Feb 1997
 */
public class BandCombineOp implements  RasterOp {
    float[][] matrix;
    int nrows = 0;
    int ncols = 0;
    RenderingHints hints;
    
    /**
     * Constructs a <CODE>BandCombineOp</CODE> with the specified matrix.
     * The width of the matrix must be equal to the number of bands in 
     * the source <CODE>Raster</CODE>, optionally plus one.  If there is one 
     * more column in the matrix than the number of bands, there is an implied 
     * 1 at the end of the vector of band samples representing a pixel.  The 
     * height of the matrix must be equal to the number of bands in the 
     * destination.
     * <p>
     * The first subscript is the row index and the second
     * is the column index.  This operation uses none of the currently
     * defined rendering hints; the <CODE>RenderingHints</CODE> argument can be 
     * null.
     * 
     * @param matrix The matrix to use for the band combine operation.
     * @param hints The <CODE>RenderingHints</CODE> object for this operation. 
     * Not currently used so it can be null.
     */
    public BandCombineOp (float[][] matrix, RenderingHints hints) {
        nrows = matrix.length;
        ncols = matrix[0].length;
        this.matrix = new float[nrows][];
        for (int i=0; i < nrows; i++) {
            /* Arrays.copyOf is forgiving of the source array being
             * too short, but it is also faster than other cloning
             * methods, so we provide our own protection for short
             * matrix rows.
             */
            if (ncols > matrix[i].length) {
                throw new IndexOutOfBoundsException("row "+i+" too short");
            }
            this.matrix[i] = Arrays.copyOf(matrix[i], ncols);
        }
        this.hints  = hints;
    }

    /**
     * Returns a copy of the linear combination matrix.
     *
     * @return The matrix associated with this band combine operation.
     */
    public final float[][] getMatrix() {
        float[][] ret = new float[nrows][];
        for (int i = 0; i < nrows; i++) {
            ret[i] = Arrays.copyOf(matrix[i], ncols);
        }
        return ret;
    }
    
    /**
     * Transforms the <CODE>Raster</CODE> using the matrix specified in the 
     * constructor. An <CODE>IllegalArgumentException</CODE> may be thrown if 
     * the number of bands in the source or destination is incompatible with 
     * the matrix.  See the class comments for more details.  
     * <p>
     * If the destination is null, it will be created with a number of bands 
     * equalling the number of rows in the matrix. No exception is thrown
     * if the operation causes a data overflow.
     *
     * @param src The <CODE>Raster</CODE> to be filtered.
     * @param dst The <CODE>Raster</CODE> in which to store the results 
     * of the filter operation.
     *
     * @return The filtered <CODE>Raster</CODE>.
     *
     * @throws IllegalArgumentException If the number of bands in the 
     * source or destination is incompatible with the matrix.
     */
    public WritableRaster filter(Raster src, WritableRaster dst) {
        int nBands = src.getNumBands();
        if (ncols != nBands && ncols != (nBands+1)) {
            throw new IllegalArgumentException("Number of columns in the "+
                                               "matrix ("+ncols+
                                               ") must be equal to the number"+
                                               " of bands ([+1]) in src ("+
                                               nBands+").");
        }
        if (dst == null) {
            dst = createCompatibleDestRaster(src);
        }
        else if (nrows != dst.getNumBands()) {
            throw new IllegalArgumentException("Number of rows in the "+
                                               "matrix ("+nrows+
                                               ") must be equal to the number"+
                                               " of bands ([+1]) in dst ("+
                                               nBands+").");
        }

        if (ImagingLib.filter(this, src, dst) != null) {
            return dst;
        }

        int[] pixel = null;
        int[] dstPixel = new int[dst.getNumBands()];
        float accum;
        int sminX = src.getMinX();
        int sY = src.getMinY();
        int dminX = dst.getMinX();
        int dY = dst.getMinY();
        int sX;
        int dX;
        if (ncols == nBands) {
            for (int y=0; y < src.getHeight(); y++, sY++, dY++) {
                dX = dminX;
                sX = sminX;
                for (int x=0; x < src.getWidth(); x++, sX++, dX++) {
                    pixel = src.getPixel(sX, sY, pixel);
                    for (int r=0; r < nrows; r++) {
                        accum = 0.f;
                        for (int c=0; c < ncols; c++) {
                            accum += matrix[r][c]*pixel[c];
                        }
                        dstPixel[r] = (int) accum;
                    }
                    dst.setPixel(dX, dY, dstPixel);
                }
            }
        }
        else {
            // Need to add constant
            for (int y=0; y < src.getHeight(); y++, sY++, dY++) {
                dX = dminX;
                sX = sminX;
                for (int x=0; x < src.getWidth(); x++, sX++, dX++) {
                    pixel = src.getPixel(sX, sY, pixel);
                    for (int r=0; r < nrows; r++) {
                        accum = 0.f;
                        for (int c=0; c < nBands; c++) {
                            accum += matrix[r][c]*pixel[c];
                        }
                        dstPixel[r] = (int) (accum+matrix[r][nBands]);
                    }
                    dst.setPixel(dX, dY, dstPixel);
                }
            }
        }

        return dst;
    }

    /**
     * Returns the bounding box of the transformed destination.  Since
     * this is not a geometric operation, the bounding box is the same for
     * the source and destination.
     * An <CODE>IllegalArgumentException</CODE> may be thrown if the number of
     * bands in the source is incompatible with the matrix.  See
     * the class comments for more details.
     *
     * @param src The <CODE>Raster</CODE> to be filtered.
     *
     * @return The <CODE>Rectangle2D</CODE> representing the destination 
     * image's bounding box.
     *
     * @throws IllegalArgumentException If the number of bands in the source
     * is incompatible with the matrix.
     */
    public final Rectangle2D getBounds2D (Raster src) {
	return src.getBounds();
    }

    
    /**
     * Creates a zeroed destination <CODE>Raster</CODE> with the correct size 
     * and number of bands.
     * An <CODE>IllegalArgumentException</CODE> may be thrown if the number of
     * bands in the source is incompatible with the matrix.  See
     * the class comments for more details.
     *
     * @param src The <CODE>Raster</CODE> to be filtered.
     *
     * @return The zeroed destination <CODE>Raster</CODE>.
     */
    public WritableRaster createCompatibleDestRaster (Raster src) {
        int nBands = src.getNumBands();
        if ((ncols != nBands) && (ncols != (nBands+1))) {
            throw new IllegalArgumentException("Number of columns in the "+
                                               "matrix ("+ncols+
                                               ") must be equal to the number"+
                                               " of bands ([+1]) in src ("+
                                               nBands+").");
        }
        if (src.getNumBands() == nrows) {
            return src.createCompatibleWritableRaster();
        }
        else {
            throw new IllegalArgumentException("Don't know how to create a "+
                                               " compatible Raster with "+
                                               nrows+" bands.");
        }
    }

    /**
     * Returns the location of the corresponding destination point given a
     * point in the source <CODE>Raster</CODE>.  If <CODE>dstPt</CODE> is 
     * specified, it is used to hold the return value.
     * Since this is not a geometric operation, the point returned 
     * is the same as the specified <CODE>srcPt</CODE>.
     *
     * @param srcPt The <code>Point2D</code> that represents the point in
     *              the source <code>Raster</code>
     * @param dstPt The <CODE>Point2D</CODE> in which to store the result.
     *
     * @return The <CODE>Point2D</CODE> in the destination image that 
     * corresponds to the specified point in the source image.     
     */
    public final Point2D getPoint2D (Point2D srcPt, Point2D dstPt) {
        if (dstPt == null) {
            dstPt = new Point2D.Float();
        }
	dstPt.setLocation(srcPt.getX(), srcPt.getY());

        return dstPt;
    }
    
    /**
     * Returns the rendering hints for this operation. 
     *
     * @return The <CODE>RenderingHints</CODE> object associated with this
     * operation.  Returns null if no hints have been set.
     */
    public final RenderingHints getRenderingHints() {
        return hints;
    }
}

Generated By: JavaOnTracks Doclet 0.1.4     ©Thibaut Colar