mirror of git://gcc.gnu.org/git/gcc.git
438 lines
13 KiB
Java
438 lines
13 KiB
Java
/* Copyright (C) 2000, 2002, 2005 Free Software Foundation
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.awt.image;
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/**
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* Class that manages arrays of data elements. A data buffer consists
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* of one or more banks. A bank is a continuous region of data
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* elements.
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*
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* @author Rolf W. Rasmussen (rolfwr@ii.uib.no)
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*/
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public abstract class DataBuffer
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{
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/**
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* A constant representing a data type that uses <code>byte</code> primitives
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* as the storage unit.
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*/
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public static final int TYPE_BYTE = 0;
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/**
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* A constant representing a data type that uses <code>short</code>
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* primitives as the storage unit.
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*/
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public static final int TYPE_USHORT = 1;
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/**
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* A constant representing a data type that uses <code>short</code>
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* primitives as the storage unit.
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*/
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public static final int TYPE_SHORT = 2;
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/**
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* A constant representing a data type that uses <code>int</code>
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* primitives as the storage unit.
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*/
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public static final int TYPE_INT = 3;
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/**
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* A constant representing a data type that uses <code>float</code>
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* primitives as the storage unit.
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*/
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public static final int TYPE_FLOAT = 4;
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/**
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* A constant representing a data type that uses <code>double</code>
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* primitives as the storage unit.
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*/
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public static final int TYPE_DOUBLE = 5;
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/**
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* A constant representing an undefined data type.
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*/
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public static final int TYPE_UNDEFINED = 32;
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/** The type of the data elements stored in the data buffer. */
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protected int dataType;
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/** The number of banks in this buffer. */
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protected int banks = 1;
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/** Offset into the default (0'th) bank). */
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protected int offset; // FIXME: Is offsets[0] always mirrored in offset?
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/** The size of the banks. */
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protected int size;
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/** Offset into each bank. */
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protected int[] offsets;
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/**
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* Creates a new <code>DataBuffer</code> with the specified data type and
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* size. The <code>dataType</code> should be one of the constants
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* {@link #TYPE_BYTE}, {@link #TYPE_SHORT}, {@link #TYPE_USHORT},
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* {@link #TYPE_INT}, {@link #TYPE_FLOAT} and {@link #TYPE_DOUBLE}.
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* <p>
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* The physical (array-based) storage is allocated by a subclass.
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*
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* @param dataType the data type.
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* @param size the number of elements in the buffer.
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*/
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protected DataBuffer(int dataType, int size)
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{
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this(dataType, size, 1);
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}
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/**
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* Creates a new <code>DataBuffer</code> with the specified data type,
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* size and number of banks. The <code>dataType</code> should be one of
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* the constants {@link #TYPE_BYTE}, {@link #TYPE_SHORT},
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* {@link #TYPE_USHORT}, {@link #TYPE_INT}, {@link #TYPE_FLOAT} and
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* {@link #TYPE_DOUBLE}.
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* <p>
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* The physical (array-based) storage is allocated by a subclass.
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*
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* @param dataType the data type.
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* @param size the number of elements in the buffer.
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* @param numBanks the number of data banks.
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*/
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protected DataBuffer(int dataType, int size, int numBanks) {
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this(dataType, size, numBanks, 0);
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}
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/**
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* Creates a new <code>DataBuffer</code> with the specified data type,
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* size and number of banks. An offset (which applies to all banks) is
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* also specified. The <code>dataType</code> should be one of
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* the constants {@link #TYPE_BYTE}, {@link #TYPE_SHORT},
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* {@link #TYPE_USHORT}, {@link #TYPE_INT}, {@link #TYPE_FLOAT} and
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* {@link #TYPE_DOUBLE}.
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* <p>
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* The physical (array-based) storage is allocated by a subclass.
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*
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* @param dataType the data type.
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* @param size the number of elements in the buffer.
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* @param numBanks the number of data banks.
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* @param offset the offset to the first element for all banks.
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*/
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protected DataBuffer(int dataType, int size, int numBanks, int offset) {
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banks = numBanks;
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this.dataType = dataType;
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this.size = size;
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this.offset = offset;
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offsets = new int[ numBanks ];
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for(int i = 0; i < numBanks; i++ )
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offsets[i] = offset;
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}
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/**
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* Creates a new <code>DataBuffer</code> with the specified data type,
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* size and number of banks. An offset (which applies to all banks) is
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* also specified. The <code>dataType</code> should be one of
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* the constants {@link #TYPE_BYTE}, {@link #TYPE_SHORT},
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* {@link #TYPE_USHORT}, {@link #TYPE_INT}, {@link #TYPE_FLOAT} and
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* {@link #TYPE_DOUBLE}.
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* <p>
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* The physical (array-based) storage is allocated by a subclass.
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*
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* @param dataType the data type.
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* @param size the number of elements in the buffer.
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* @param numBanks the number of data banks.
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* @param offsets the offsets to the first element for all banks.
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*
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* @throws ArrayIndexOutOfBoundsException if
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* <code>numBanks != offsets.length</code>.
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*/
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protected DataBuffer(int dataType, int size, int numBanks, int[] offsets) {
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if (numBanks != offsets.length)
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throw new ArrayIndexOutOfBoundsException();
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this.dataType = dataType;
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this.size = size;
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banks = numBanks;
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this.offsets = offsets;
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offset = offsets[0];
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}
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/**
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* Returns the size (number of bits) of the specified data type. Valid types
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* are defined by the constants {@link #TYPE_BYTE}, {@link #TYPE_SHORT},
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* {@link #TYPE_USHORT}, {@link #TYPE_INT}, {@link #TYPE_FLOAT} and
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* {@link #TYPE_DOUBLE}.
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*
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* @param dataType the data type.
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* @return The number of bits for the specified data type.
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* @throws IllegalArgumentException if <code>dataType < 0</code> or
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* <code>dataType > TYPE_DOUBLE</code>.
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*/
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public static int getDataTypeSize(int dataType) {
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// Maybe this should be a lookup table instead.
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switch (dataType)
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{
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case TYPE_BYTE:
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return 8;
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case TYPE_USHORT:
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case TYPE_SHORT:
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return 16;
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case TYPE_INT:
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case TYPE_FLOAT:
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return 32;
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case TYPE_DOUBLE:
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return 64;
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default:
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throw new IllegalArgumentException();
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}
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}
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/**
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* Returns the type of the data elements in the data buffer. Valid types
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* are defined by the constants {@link #TYPE_BYTE}, {@link #TYPE_SHORT},
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* {@link #TYPE_USHORT}, {@link #TYPE_INT}, {@link #TYPE_FLOAT} and
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* {@link #TYPE_DOUBLE}.
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*
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* @return The type.
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*/
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public int getDataType()
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{
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return dataType;
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}
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/**
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* Returns the size of the data buffer.
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*
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* @return The size.
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*/
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public int getSize()
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{
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return size;
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}
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/**
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* Returns the element offset for the first data bank.
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*
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* @return The element offset.
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*/
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public int getOffset()
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{
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return offset;
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}
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/**
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* Returns the offsets for all the data banks used by this
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* <code>DataBuffer</code>.
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*
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* @return The offsets.
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*/
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public int[] getOffsets()
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{
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if (offsets == null)
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{
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// is this necessary?
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offsets = new int[1];
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offsets[0] = offset;
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}
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return offsets;
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}
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/**
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* Returns the number of data banks for this <code>DataBuffer</code>.
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* @return The number of data banks.
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*/
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public int getNumBanks()
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{
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return banks;
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}
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/**
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* Returns an element from the first data bank. The offset (specified in
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* the constructor) is added to <code>i</code> before accessing the
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* underlying data array.
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*
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* @param i the element index.
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* @return The element.
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*/
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public int getElem(int i)
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{
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return getElem(0, i);
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}
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/**
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* Returns an element from a particular data bank. The offset (specified in
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* the constructor) is added to <code>i</code> before accessing the
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* underlying data array.
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*
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* @param bank the bank index.
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* @param i the element index.
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* @return The element.
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*/
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public abstract int getElem(int bank, int i);
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/**
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* Sets an element in the first data bank. The offset (specified in the
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* constructor) is added to <code>i</code> before updating the underlying
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* data array.
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*
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* @param i the element index.
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* @param val the new element value.
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*/
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public void setElem(int i, int val)
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{
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setElem(0, i, val);
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}
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/**
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* Sets an element in a particular data bank. The offset (specified in the
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* constructor) is added to <code>i</code> before updating the underlying
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* data array.
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*
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* @param bank the data bank index.
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* @param i the element index.
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* @param val the new element value.
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*/
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public abstract void setElem(int bank, int i, int val);
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/**
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* Returns an element from the first data bank, converted to a
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* <code>float</code>. The offset (specified in the constructor) is added
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* to <code>i</code> before accessing the underlying data array.
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*
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* @param i the element index.
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* @return The element.
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*/
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public float getElemFloat(int i)
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{
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return getElem(i);
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}
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/**
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* Returns an element from a particular data bank, converted to a
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* <code>float</code>. The offset (specified in the constructor) is
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* added to <code>i</code> before accessing the underlying data array.
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*
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* @param bank the bank index.
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* @param i the element index.
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* @return The element.
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*/
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public float getElemFloat(int bank, int i)
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{
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return getElem(bank, i);
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}
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/**
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* Sets an element in the first data bank. The offset (specified in the
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* constructor) is added to <code>i</code> before updating the underlying
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* data array.
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*
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* @param i the element index.
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* @param val the new element value.
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*/
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public void setElemFloat(int i, float val)
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{
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setElem(i, (int) val);
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}
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/**
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* Sets an element in a particular data bank. The offset (specified in the
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* constructor) is added to <code>i</code> before updating the underlying
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* data array.
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*
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* @param bank the data bank index.
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* @param i the element index.
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* @param val the new element value.
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*/
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public void setElemFloat(int bank, int i, float val)
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{
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setElem(bank, i, (int) val);
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}
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/**
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* Returns an element from the first data bank, converted to a
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* <code>double</code>. The offset (specified in the constructor) is added
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* to <code>i</code> before accessing the underlying data array.
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*
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* @param i the element index.
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* @return The element.
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*/
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public double getElemDouble(int i)
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{
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return getElem(i);
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}
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/**
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* Returns an element from a particular data bank, converted to a
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* <code>double</code>. The offset (specified in the constructor) is
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* added to <code>i</code> before accessing the underlying data array.
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*
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* @param bank the bank index.
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* @param i the element index.
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* @return The element.
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*/
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public double getElemDouble(int bank, int i)
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{
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return getElem(bank, i);
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}
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/**
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* Sets an element in the first data bank. The offset (specified in the
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* constructor) is added to <code>i</code> before updating the underlying
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* data array.
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*
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* @param i the element index.
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* @param val the new element value.
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*/
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public void setElemDouble(int i, double val)
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{
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setElem(i, (int) val);
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}
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/**
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* Sets an element in a particular data bank. The offset (specified in the
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* constructor) is added to <code>i</code> before updating the underlying
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* data array.
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*
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* @param bank the data bank index.
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* @param i the element index.
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* @param val the new element value.
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*/
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public void setElemDouble(int bank, int i, double val)
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{
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setElem(bank, i, (int) val);
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}
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}
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