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From-SVN: r102074
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Tom Tromey
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libjava/classpath/java/awt/image/DataBufferInt.java
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libjava/classpath/java/awt/image/DataBufferInt.java
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/* 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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/* This is one of several classes that are nearly identical. Maybe we
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should have a central template and generate all these files. This
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is one of the cases where templates or macros would have been
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useful to have in Java.
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This file has been created using search-replace. My only fear is
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that these classes will grow out-of-sync as of a result of changes
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that are not propagated to the other files. As always, mirroring
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code is a maintenance nightmare. */
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/**
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* A {@link DataBuffer} that uses an array of <code>int</code> primitives
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* to represent each of its banks.
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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 final class DataBufferInt extends DataBuffer
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{
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private int[] data;
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private int[][] bankData;
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/**
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* Creates a new data buffer with a single data bank containing the
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* specified number of <code>int</code> elements.
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*
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* @param size the number of elements in the data bank.
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*/
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public DataBufferInt(int size)
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{
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super(TYPE_INT, size, 1, 0);
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bankData = new int[1][];
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data = new int[size];
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bankData[0] = data;
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}
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/**
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* Creates a new data buffer with the specified number of data banks,
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* each containing the specified number of <code>int</code> elements.
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*
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* @param size the number of elements in the data bank.
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* @param numBanks the number of data banks.
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*/
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public DataBufferInt(int size, int numBanks)
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{
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super(TYPE_INT, size, numBanks);
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bankData = new int[numBanks][size];
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data = bankData[0];
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}
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/**
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* Creates a new data buffer backed by the specified data bank.
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* <p>
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* Note: there is no exception when <code>dataArray</code> is
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* <code>null</code>, but in that case an exception will be thrown
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* later if you attempt to access the data buffer.
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*
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* @param dataArray the data bank.
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* @param size the number of elements in the data bank.
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*/
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public DataBufferInt(int[] dataArray, int size)
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{
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super(TYPE_INT, size, 1, 0);
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bankData = new int[1][];
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data = dataArray;
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bankData[0] = data;
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}
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/**
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* Creates a new data buffer backed by the specified data bank, with
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* the specified offset to the first element.
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* <p>
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* Note: there is no exception when <code>dataArray</code> is
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* <code>null</code>, but in that case an exception will be thrown
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* later if you attempt to access the data buffer.
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*
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* @param dataArray the data bank.
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* @param size the number of elements in the data bank.
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* @param offset the offset to the first element in the array.
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*/
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public DataBufferInt(int[] dataArray, int size, int offset)
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{
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super(TYPE_INT, size, 1, offset);
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bankData = new int[1][];
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data = dataArray;
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bankData[0] = data;
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}
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/**
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* Creates a new data buffer backed by the specified data banks.
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*
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* @param dataArray the data banks.
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* @param size the number of elements in the data bank.
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*
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* @throws NullPointerException if <code>dataArray</code> is
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* <code>null</code>.
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*/
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public DataBufferInt(int[][] dataArray, int size)
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{
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super(TYPE_INT, size, dataArray.length);
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bankData = dataArray;
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data = bankData[0];
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}
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/**
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* Creates a new data buffer backed by the specified data banks, with
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* the specified offsets to the first element in each bank.
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*
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* @param dataArray the data banks.
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* @param size the number of elements in the data bank.
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* @param offsets the offsets to the first element in each data bank.
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*
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* @throws NullPointerException if <code>dataArray</code> is
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* <code>null</code>.
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*/
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public DataBufferInt(int[][] dataArray, int size, int[] offsets)
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{
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super(TYPE_INT, size, dataArray.length, offsets);
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bankData = dataArray;
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data = bankData[0];
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}
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/**
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* Returns the first data bank.
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*
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* @return The first data bank.
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*/
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public int[] getData()
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{
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return data;
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}
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/**
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* Returns a data bank.
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*
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* @param bank the bank index.
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* @return A data bank.
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*/
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public int[] getData(int bank)
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{
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return bankData[bank];
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}
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/**
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* Returns the array underlying this <code>DataBuffer</code>.
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*
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* @return The data banks.
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*/
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public int[][] getBankData()
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{
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return bankData;
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}
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/**
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* Returns an element from the first data bank. The <code>offset</code> is
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* added to the specified index 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 int getElem(int i)
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{
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return data[i+offset];
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}
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/**
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* Returns an element from a particular data bank. The <code>offset</code>
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* is added to the specified index before accessing the underlying data
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* 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 int getElem(int bank, int i)
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{
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// get unsigned int as int
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return bankData[bank][i+offsets[bank]];
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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 setElem(int i, int val)
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{
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data[i+offset] = 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 setElem(int bank, int i, int val)
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{
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bankData[bank][i+offsets[bank]] = val;
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}
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}
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