| /* Copyright (C) 2000, 2002 Free Software Foundation |
| |
| This file is part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| GNU Classpath is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| package java.awt.image; |
| |
| /* This is one of several classes that are nearly identical. Maybe we |
| should have a central template and generate all these files. This |
| is one of the cases where templates or macros would have been |
| useful to have in Java. |
| |
| This file has been created using search-replace. My only fear is |
| that these classes will grow out-of-sync as of a result of changes |
| that are not propagated to the other files. As always, mirroring |
| code is a maintenance nightmare. */ |
| |
| /** |
| * @author Rolf W. Rasmussen (rolfwr@ii.uib.no) |
| */ |
| public final class DataBufferByte extends DataBuffer |
| { |
| private byte[] data; |
| private byte[][] bankData; |
| |
| /** |
| * Creates a new data buffer with a single data bank containing the |
| * specified number of <code>byte</code> elements. |
| * |
| * @param size the number of elements in the data bank. |
| */ |
| public DataBufferByte(int size) |
| { |
| super(TYPE_BYTE, size, 1, 0); |
| bankData = new byte[1][]; |
| data = new byte[size]; |
| bankData[0] = data; |
| } |
| |
| /** |
| * Creates a new data buffer with the specified number of data banks, |
| * each containing the specified number of <code>byte</code> elements. |
| * |
| * @param size the number of elements in the data bank. |
| * @param numBanks the number of data banks. |
| */ |
| public DataBufferByte(int size, int numBanks) |
| { |
| super(TYPE_BYTE, size, numBanks); |
| bankData = new byte[numBanks][size]; |
| data = bankData[0]; |
| } |
| |
| /** |
| * Creates a new data buffer backed by the specified data bank. |
| * <p> |
| * Note: there is no exception when <code>dataArray</code> is |
| * <code>null</code>, but in that case an exception will be thrown |
| * later if you attempt to access the data buffer. |
| * |
| * @param dataArray the data bank. |
| * @param size the number of elements in the data bank. |
| */ |
| public DataBufferByte(byte[] dataArray, int size) |
| { |
| super(TYPE_BYTE, size, 1, 0); |
| bankData = new byte[1][]; |
| data = dataArray; |
| bankData[0] = data; |
| } |
| |
| /** |
| * Creates a new data buffer backed by the specified data bank, with |
| * the specified offset to the first element. |
| * <p> |
| * Note: there is no exception when <code>dataArray</code> is |
| * <code>null</code>, but in that case an exception will be thrown |
| * later if you attempt to access the data buffer. |
| * |
| * @param dataArray the data bank. |
| * @param size the number of elements in the data bank. |
| * @param offset the offset to the first element in the array. |
| */ |
| public DataBufferByte(byte[] dataArray, int size, int offset) |
| { |
| super(TYPE_BYTE, size, 1, offset); |
| bankData = new byte[1][]; |
| data = dataArray; |
| bankData[0] = data; |
| } |
| |
| /** |
| * Creates a new data buffer backed by the specified data banks. |
| * |
| * @param dataArray the data banks. |
| * @param size the number of elements in the data bank. |
| * |
| * @throws NullPointerException if <code>dataArray</code> is |
| * <code>null</code>. |
| */ |
| public DataBufferByte(byte[][] dataArray, int size) |
| { |
| super(TYPE_BYTE, size, dataArray.length); |
| bankData = dataArray; |
| data = bankData[0]; |
| } |
| |
| /** |
| * Creates a new data buffer backed by the specified data banks, with |
| * the specified offsets to the first element in each bank. |
| * |
| * @param dataArray the data banks. |
| * @param size the number of elements in the data bank. |
| * @param offsets the offsets to the first element in each data bank. |
| * |
| * @throws NullPointerException if <code>dataArray</code> is |
| * <code>null</code>. |
| */ |
| public DataBufferByte(byte[][] dataArray, int size, int[] offsets) |
| { |
| super(TYPE_BYTE, size, dataArray.length, offsets); |
| bankData = dataArray; |
| data = bankData[0]; |
| } |
| |
| /** |
| * Returns the first data bank. |
| * |
| * @return The first data bank. |
| */ |
| public byte[] getData() |
| { |
| return data; |
| } |
| |
| /** |
| * Returns a data bank. |
| * |
| * @param bank the bank index. |
| * @return A data bank. |
| */ |
| public byte[] getData(int bank) |
| { |
| return bankData[bank]; |
| } |
| |
| /** |
| * Returns the array underlying this <code>DataBuffer</code>. |
| * |
| * @return The data banks. |
| */ |
| public byte[][] getBankData() |
| { |
| return bankData; |
| } |
| |
| /** |
| * Returns an element from the first data bank. The offset (specified in |
| * the constructor) is added to <code>i</code> before accessing the |
| * underlying data array. |
| * |
| * @param i the element index. |
| * @return The element. |
| */ |
| public int getElem(int i) |
| { |
| return data[i+offset] & 0xff; // get unsigned byte as int |
| } |
| |
| /** |
| * Returns an element from a particular data bank. The offset (specified in |
| * the constructor) is added to <code>i</code> before accessing the |
| * underlying data array. |
| * |
| * @param bank the bank index. |
| * @param i the element index. |
| * @return The element. |
| */ |
| public int getElem(int bank, int i) |
| { |
| // get unsigned byte as int |
| return bankData[bank][i+offsets[bank]] & 0xff; |
| } |
| |
| /** |
| * Sets an element in the first data bank. The offset (specified in the |
| * constructor) is added to <code>i</code> before updating the underlying |
| * data array. |
| * |
| * @param i the element index. |
| * @param val the new element value. |
| */ |
| public void setElem(int i, int val) |
| { |
| data[i+offset] = (byte) val; |
| } |
| |
| /** |
| * Sets an element in a particular data bank. The offset (specified in the |
| * constructor) is added to <code>i</code> before updating the underlying |
| * data array. |
| * |
| * @param bank the data bank index. |
| * @param i the element index. |
| * @param val the new element value. |
| */ |
| public void setElem(int bank, int i, int val) |
| { |
| bankData[bank][i+offsets[bank]] = (byte) val; |
| } |
| } |