001 /* PixelInterleavedSampleModel.java
002 Copyright (C) 2004, 2005 Free Software Foundation, Inc.
003
004 This file is part of GNU Classpath.
005
006 GNU Classpath is free software; you can redistribute it and/or modify
007 it under the terms of the GNU General Public License as published by
008 the Free Software Foundation; either version 2, or (at your option)
009 any later version.
010
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012 WITHOUT ANY WARRANTY; without even the implied warranty of
013 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
014 General Public License for more details.
015
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017 along with GNU Classpath; see the file COPYING. If not, write to the
018 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
019 02110-1301 USA.
020
021 Linking this library statically or dynamically with other modules is
022 making a combined work based on this library. Thus, the terms and
023 conditions of the GNU General Public License cover the whole
024 combination.
025
026 As a special exception, the copyright holders of this library give you
027 permission to link this library with independent modules to produce an
028 executable, regardless of the license terms of these independent
029 modules, and to copy and distribute the resulting executable under
030 terms of your choice, provided that you also meet, for each linked
031 independent module, the terms and conditions of the license of that
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033 or based on this library. If you modify this library, you may extend
034 this exception to your version of the library, but you are not
035 obligated to do so. If you do not wish to do so, delete this
036 exception statement from your version. */
037
038 package java.awt.image;
039
040
041 /**
042 * A <code>SampleModel</code> that uses exactly one element of the
043 * raster’s {@link DataBuffer} per pixel, holds all bands in a
044 * single bank, and stores band data in pixel-interleaved manner.
045 *
046 * @since 1.2
047 *
048 * @author Sascha Brawer (brawer@dandelis.ch)
049 */
050 public class PixelInterleavedSampleModel
051 extends ComponentSampleModel
052 {
053 public PixelInterleavedSampleModel(int dataType, int width, int height,
054 int pixelStride, int scanlineStride,
055 int[] bandOffsets)
056 {
057 super(dataType, width, height, pixelStride, scanlineStride,
058 bandOffsets);
059 }
060
061
062 /**
063 * Creates a new <code>SampleModel</code> that is like this one, but
064 * uses the specified width and height.
065 *
066 * @param width the number of pixels in the horizontal direction.
067 *
068 * @param height the number of pixels in the vertical direction.
069 */
070 public SampleModel createCompatibleSampleModel(int width, int height)
071 {
072 // Find minimum band offset.
073 int minBandoff = bandOffsets[0];
074 int numBands = bandOffsets.length;
075 for (int i = 1; i < numBands; i++)
076 {
077 if (bandOffsets[i] < minBandoff)
078 {
079 minBandoff = bandOffsets[i];
080 }
081 }
082 // Adjust band offsets so that minimum offset is at 0.
083 int[] bandOff;
084 if (minBandoff > 0)
085 {
086 bandOff = new int[numBands];
087 for (int i = 0; i < numBands; i++)
088 {
089 bandOff[i] = bandOffsets[i] - minBandoff;
090 }
091 }
092 else
093 {
094 bandOff = bandOffsets;
095 }
096 // Adjust scanline stride for new width.
097 return new PixelInterleavedSampleModel(dataType, width, height,
098 pixelStride, pixelStride * width,
099 bandOff);
100 }
101
102
103 /**
104 * Creates a new <code>SampleModel</code> that is like this one, but
105 * uses only a subset of its bands.
106 *
107 * @param bands an array whose elements indicate which bands shall
108 * be part of the subset. For example, <code>[0, 2, 3]</code> would
109 * create a SampleModel containing bands #0, #2 and #3.
110 */
111 public SampleModel createSubsetSampleModel(int[] bands)
112 {
113 int[] subOffsets;
114
115 subOffsets = new int[bands.length];
116 for (int i = 0; i < bands.length; i++)
117 subOffsets[i] = bandOffsets[bands[i]];
118
119 return new PixelInterleavedSampleModel(dataType, width, height,
120 pixelStride, scanlineStride,
121 subOffsets);
122 }
123 }