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/* * @(#)PixelInterleavedSampleModel.java 1.21 05/11/17 * * Copyright 2006 Sun Microsystems, Inc. All rights reserved. * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms. */ package java.awt.image; /** * This class represents image data which is stored in a pixel interleaved * fashion and for * which each sample of a pixel occupies one data element of the DataBuffer. * It subclasses ComponentSampleModel but provides a more efficent * implementation for accessing pixel interleaved image data than is provided * by ComponentSampleModel. This class * stores sample data for all bands in a single bank of the * DataBuffer. Accessor methods are provided so that image data can be * manipulated directly. Pixel stride is the number of * data array elements between two samples for the same band on the same * scanline. Scanline stride is the number of data array elements between * a given sample and the corresponding sample in the same column of the next * scanline. Band offsets denote the number * of data array elements from the first data array element of the bank * of the DataBuffer holding each band to the first sample of the band. * The bands are numbered from 0 to N-1. * Bank indices denote the correspondence between a bank of the data buffer * and a band of image data. * This class supports * {@link DataBuffer#TYPE_BYTE TYPE_BYTE}, * {@link DataBuffer#TYPE_USHORT TYPE_USHORT}, * {@link DataBuffer#TYPE_SHORT TYPE_SHORT}, * {@link DataBuffer#TYPE_INT TYPE_INT}, * {@link DataBuffer#TYPE_FLOAT TYPE_FLOAT} and * {@link DataBuffer#TYPE_DOUBLE TYPE_DOUBLE} datatypes. */ public class PixelInterleavedSampleModel extends ComponentSampleModel { /** * Constructs a PixelInterleavedSampleModel with the specified parameters. * The number of bands will be given by the length of the bandOffsets * array. * @param dataType The data type for storing samples. * @param w The width (in pixels) of the region of * image data described. * @param h The height (in pixels) of the region of * image data described. * @param pixelStride The pixel stride of the image data. * @param scanlineStride The line stride of the image data. * @param bandOffsets The offsets of all bands. * @throws IllegalArgumentException if <code>w</code> or * <code>h</code> is not greater than 0 * @throws IllegalArgumentException if any offset between bands is * greater than the scanline stride * @throws IllegalArgumentException if the product of * <code>pixelStride</code> and <code>w</code> is greater * than <code>scanlineStride</code> * @throws IllegalArgumentException if <code>pixelStride</code> is * less than any offset between bands * @throws IllegalArgumentException if <code>dataType</code> is not * one of the supported data types */ public PixelInterleavedSampleModel(int dataType, int w, int h, int pixelStride, int scanlineStride, int bandOffsets[]) { super(dataType, w, h, pixelStride, scanlineStride, bandOffsets); int minBandOff=bandOffsets[0]; int maxBandOff=bandOffsets[0]; for (int i=1; i<bandOffsets.length; i++) { minBandOff = Math.min(minBandOff,bandOffsets[i]); maxBandOff = Math.max(maxBandOff,bandOffsets[i]); } maxBandOff -= minBandOff; if (maxBandOff > scanlineStride) { throw new IllegalArgumentException("Offsets between bands must be"+ " less than the scanline "+ " stride"); } if (pixelStride*w > scanlineStride) { throw new IllegalArgumentException("Pixel stride times width "+ "must be less than or "+ "equal to the scanline "+ "stride"); } if (pixelStride < maxBandOff) { throw new IllegalArgumentException("Pixel stride must be greater"+ " than or equal to the offsets"+ " between bands"); } } /** * Creates a new PixelInterleavedSampleModel with the specified * width and height. The new PixelInterleavedSampleModel will have the * same number of bands, storage data type, and pixel stride * as this PixelInterleavedSampleModel. The band offsets may be * compressed such that the minimum of all of the band offsets is zero. * @param w the width of the resulting <code>SampleModel</code> * @param h the height of the resulting <code>SampleModel</code> * @return a new <code>SampleModel</code> with the specified width * and height. * @throws IllegalArgumentException if <code>w</code> or * <code>h</code> is not greater than 0 */ public SampleModel createCompatibleSampleModel(int w, int h) { int minBandoff=bandOffsets[0]; int numBands = bandOffsets.length; for (int i=1; i < numBands; i++) { if (bandOffsets[i] < minBandoff) { minBandoff = bandOffsets[i]; } } int[] bandOff; if (minBandoff > 0) { bandOff = new int[numBands]; for (int i=0; i < numBands; i++) { bandOff[i] = bandOffsets[i] - minBandoff; } } else { bandOff = bandOffsets; } return new PixelInterleavedSampleModel(dataType, w, h, pixelStride, pixelStride*w, bandOff); } /** * Creates a new PixelInterleavedSampleModel with a subset of the * bands of this PixelInterleavedSampleModel. The new * PixelInterleavedSampleModel can be used with any DataBuffer that the * existing PixelInterleavedSampleModel can be used with. The new * PixelInterleavedSampleModel/DataBuffer combination will represent * an image with a subset of the bands of the original * PixelInterleavedSampleModel/DataBuffer combination. */ public SampleModel createSubsetSampleModel(int bands[]) { int newBandOffsets[] = new int[bands.length]; for (int i=0; i<bands.length; i++) { newBandOffsets[i] = bandOffsets[bands[i]]; } return new PixelInterleavedSampleModel(this.dataType, width, height, this.pixelStride, scanlineStride, newBandOffsets); } // Differentiate hash code from other ComponentSampleModel subclasses public int hashCode() { return super.hashCode() ^ 0x1; } }