Source Code Cross Referenced for PixelInterleavedSampleModel.java in  » 6.0-JDK-Core » AWT » java » awt » image » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Core » AWT » java.awt.image 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001        /*
002         * Copyright 1998-2001 Sun Microsystems, Inc.  All Rights Reserved.
003         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004         *
005         * This code is free software; you can redistribute it and/or modify it
006         * under the terms of the GNU General Public License version 2 only, as
007         * published by the Free Software Foundation.  Sun designates this
008         * particular file as subject to the "Classpath" exception as provided
009         * by Sun in the LICENSE file that accompanied this code.
010         *
011         * This code is distributed in the hope that it will be useful, but WITHOUT
012         * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
013         * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
014         * version 2 for more details (a copy is included in the LICENSE file that
015         * accompanied this code).
016         *
017         * You should have received a copy of the GNU General Public License version
018         * 2 along with this work; if not, write to the Free Software Foundation,
019         * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
020         *
021         * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
022         * CA 95054 USA or visit www.sun.com if you need additional information or
023         * have any questions.
024         */
025
026        package java.awt.image;
027
028        /**
029         *  This class represents image data which is stored in a pixel interleaved
030         *  fashion and for
031         *  which each sample of a pixel occupies one data element of the DataBuffer.
032         *  It subclasses ComponentSampleModel but provides a more efficent
033         *  implementation for accessing pixel interleaved image data than is provided
034         *  by ComponentSampleModel.  This class 
035         *  stores sample data for all bands in a single bank of the
036         *  DataBuffer. Accessor methods are provided so that image data can be
037         *  manipulated directly. Pixel stride is the number of
038         *  data array elements between two samples for the same band on the same
039         *  scanline. Scanline stride is the number of data array elements between
040         *  a given sample and the corresponding sample in the same column of the next
041         *  scanline.  Band offsets denote the number
042         *  of data array elements from the first data array element of the bank
043         *  of the DataBuffer holding each band to the first sample of the band.
044         *  The bands are numbered from 0 to N-1.
045         *  Bank indices denote the correspondence between a bank of the data buffer
046         *  and a band of image data.
047         *  This class supports
048         *  {@link DataBuffer#TYPE_BYTE TYPE_BYTE},
049         *  {@link DataBuffer#TYPE_USHORT TYPE_USHORT},
050         *  {@link DataBuffer#TYPE_SHORT TYPE_SHORT},
051         *  {@link DataBuffer#TYPE_INT TYPE_INT},
052         *  {@link DataBuffer#TYPE_FLOAT TYPE_FLOAT} and
053         *  {@link DataBuffer#TYPE_DOUBLE TYPE_DOUBLE} datatypes.  
054         */
055
056        public class PixelInterleavedSampleModel extends ComponentSampleModel {
057            /**
058             * Constructs a PixelInterleavedSampleModel with the specified parameters.
059             * The number of bands will be given by the length of the bandOffsets 
060             * array.
061             * @param dataType  The data type for storing samples.
062             * @param w         The width (in pixels) of the region of
063             *                  image data described.
064             * @param h         The height (in pixels) of the region of
065             *                  image data described.
066             * @param pixelStride The pixel stride of the image data.
067             * @param scanlineStride The line stride of the image data.
068             * @param bandOffsets The offsets of all bands.
069             * @throws IllegalArgumentException if <code>w</code> or
070             *         <code>h</code> is not greater than 0
071             * @throws IllegalArgumentException if any offset between bands is
072             *         greater than the scanline stride
073             * @throws IllegalArgumentException if the product of 
074             *         <code>pixelStride</code> and <code>w</code> is greater
075             *         than <code>scanlineStride</code>
076             * @throws IllegalArgumentException if <code>pixelStride</code> is 
077             *         less than any offset between bands
078             * @throws IllegalArgumentException if <code>dataType</code> is not
079             *         one of the supported data types
080             */
081            public PixelInterleavedSampleModel(int dataType, int w, int h,
082                    int pixelStride, int scanlineStride, int bandOffsets[]) {
083                super (dataType, w, h, pixelStride, scanlineStride, bandOffsets);
084                int minBandOff = bandOffsets[0];
085                int maxBandOff = bandOffsets[0];
086                for (int i = 1; i < bandOffsets.length; i++) {
087                    minBandOff = Math.min(minBandOff, bandOffsets[i]);
088                    maxBandOff = Math.max(maxBandOff, bandOffsets[i]);
089                }
090                maxBandOff -= minBandOff;
091                if (maxBandOff > scanlineStride) {
092                    throw new IllegalArgumentException(
093                            "Offsets between bands must be"
094                                    + " less than the scanline " + " stride");
095                }
096                if (pixelStride * w > scanlineStride) {
097                    throw new IllegalArgumentException(
098                            "Pixel stride times width "
099                                    + "must be less than or "
100                                    + "equal to the scanline " + "stride");
101                }
102                if (pixelStride < maxBandOff) {
103                    throw new IllegalArgumentException(
104                            "Pixel stride must be greater"
105                                    + " than or equal to the offsets"
106                                    + " between bands");
107                }
108            }
109
110            /**
111             * Creates a new PixelInterleavedSampleModel with the specified
112             * width and height.  The new PixelInterleavedSampleModel will have the
113             * same number of bands, storage data type, and pixel stride
114             * as this PixelInterleavedSampleModel.  The band offsets may be
115             * compressed such that the minimum of all of the band offsets is zero.
116             * @param w the width of the resulting <code>SampleModel</code>
117             * @param h the height of the resulting <code>SampleModel</code>
118             * @return a new <code>SampleModel</code> with the specified width
119             *         and height.
120             * @throws IllegalArgumentException if <code>w</code> or
121             *         <code>h</code> is not greater than 0
122             */
123            public SampleModel createCompatibleSampleModel(int w, int h) {
124                int minBandoff = bandOffsets[0];
125                int numBands = bandOffsets.length;
126                for (int i = 1; i < numBands; i++) {
127                    if (bandOffsets[i] < minBandoff) {
128                        minBandoff = bandOffsets[i];
129                    }
130                }
131                int[] bandOff;
132                if (minBandoff > 0) {
133                    bandOff = new int[numBands];
134                    for (int i = 0; i < numBands; i++) {
135                        bandOff[i] = bandOffsets[i] - minBandoff;
136                    }
137                } else {
138                    bandOff = bandOffsets;
139                }
140                return new PixelInterleavedSampleModel(dataType, w, h,
141                        pixelStride, pixelStride * w, bandOff);
142            }
143
144            /**
145             * Creates a new PixelInterleavedSampleModel with a subset of the
146             * bands of this PixelInterleavedSampleModel.  The new
147             * PixelInterleavedSampleModel can be used with any DataBuffer that the
148             * existing PixelInterleavedSampleModel can be used with.  The new
149             * PixelInterleavedSampleModel/DataBuffer combination will represent
150             * an image with a subset of the bands of the original
151             * PixelInterleavedSampleModel/DataBuffer combination.
152             */
153            public SampleModel createSubsetSampleModel(int bands[]) {
154                int newBandOffsets[] = new int[bands.length];
155                for (int i = 0; i < bands.length; i++) {
156                    newBandOffsets[i] = bandOffsets[bands[i]];
157                }
158                return new PixelInterleavedSampleModel(this .dataType, width,
159                        height, this .pixelStride, scanlineStride,
160                        newBandOffsets);
161            }
162
163            // Differentiate hash code from other ComponentSampleModel subclasses
164            public int hashCode() {
165                return super .hashCode() ^ 0x1;
166            }
167        }
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