gridpacking.java

GEo 地理操作源代码

/*$************************************************************************************************
 **
 ** $Id: GridPacking.java,v 1.6 2004/04/28 19:40:26 desruisseaux Exp $
 **
 ** $Source: /cvsroot/geoapi/src/org/opengis/coverage/grid/GridPacking.java,v $
 **
 ** Copyright (C) 2003 Open GIS Consortium, Inc. All Rights Reserved. http://www.opengis.org/Legal/
 **
 *************************************************************************************************/
package org.opengis.coverage.grid;

// OpenGIS direct dependencies
import org.opengis.coverage.SampleDimensionType;  // For Javadoc


/**
 * Describes the packing of data values within grid coverages.
 * It includes the packing scheme of data values with less then 8 bits per value
 * within a byte, byte packing (Little Endian / Big Endian) for values with more
 * than 8 bits and the packing of the values within the dimensions.
 *
 * @UML abstract GC_GridPacking
 * @author <A HREF="http://www.opengis.org">OpenGIS&reg; consortium</A>
 * @version <A HREF="http://www.opengis.org/docs/01-004.pdf">Grid Coverage specification 1.0</A>
 */
public interface GridPacking {
    /**
     * Order of bytes packed in values for sample dimensions with greater than 8 bits.
     *
     * @UML mandatory byteInValuePacking
     */
    ByteInValuePacking getByteInValuePacking();

    /**
     * Order of values packed in a byte for sample dimensions with less than 8 bits.
     * This include
     * {@link SampleDimensionType#UNSIGNED_1BIT UNSIGNED_1BIT},
     * {@link SampleDimensionType#UNSIGNED_2BITS UNSIGNED_2BITS} and
     * {@link SampleDimensionType#UNSIGNED_4BITS UNSIGNED_4BITS} data types.
     *
     * @UML mandatory valueInBytePacking
     */
    ValueInBytePacking getValueInBytePacking();

    /**
     * Gives the ordinate index for the band.
     * This index indicates how to form a band-specific coordinate from a grid coordinate
     * and a sample dimension number. This indicates the order in which the grid values
     * are stored in streamed data. This packing order is used when grid values are
     * retrieved using the <code>getPackedDataBlock</code> or set using
     * <code>setPackedDataBlock</code> operations on {@link GridCoverage}.
     *
     *  bandPacking of
     *  <UL>
     *    <li>0 : the full band-specific coordinate is (b, n1, n2...)</li>
     *    <li>1 : the full band-specific coordinate is (n1, b, n2...)</li>
     *    <li>2 : the full band-specific coordinate is (n1, n2, b...)</li>
     *  </UL>
     *  Where
     *  <UL>
     *    <li>b is band</li>
     *    <li>n1 is dimension 1</li>
     *    <li>n2 is dimension 2</li>
     *  </UL>
     *  For 2 dimensional grids, band packing of 0 is referred to as band sequential,
     *  1 line interleaved and 2 pixel interleaved.
     *
     * @UML mandatory bandPacking
     *
     * @see java.awt.image.BandedSampleModel
     * @see java.awt.image.PixelInterleavedSampleModel
     */
    int getBandPacking();
}