001/* DataBufferUShort.java -- 002 Copyright (C) 2000, 2002, 2004, 2005 Free Software Foundation 003 004This file is part of GNU Classpath. 005 006GNU Classpath is free software; you can redistribute it and/or modify 007it under the terms of the GNU General Public License as published by 008the Free Software Foundation; either version 2, or (at your option) 009any later version. 010 011GNU Classpath is distributed in the hope that it will be useful, but 012WITHOUT ANY WARRANTY; without even the implied warranty of 013MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 014General Public License for more details. 015 016You should have received a copy of the GNU General Public License 017along with GNU Classpath; see the file COPYING. If not, write to the 018Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 01902110-1301 USA. 020 021Linking this library statically or dynamically with other modules is 022making a combined work based on this library. Thus, the terms and 023conditions of the GNU General Public License cover the whole 024combination. 025 026As a special exception, the copyright holders of this library give you 027permission to link this library with independent modules to produce an 028executable, regardless of the license terms of these independent 029modules, and to copy and distribute the resulting executable under 030terms of your choice, provided that you also meet, for each linked 031independent module, the terms and conditions of the license of that 032module. An independent module is a module which is not derived from 033or based on this library. If you modify this library, you may extend 034this exception to your version of the library, but you are not 035obligated to do so. If you do not wish to do so, delete this 036exception statement from your version. */ 037 038package java.awt.image; 039 040/* This is one of several classes that are nearly identical. Maybe we 041 should have a central template and generate all these files. This 042 is one of the cases where templates or macros would have been 043 useful to have in Java. 044 045 This file has been created using search-replace. My only fear is 046 that these classes will grow out-of-sync as of a result of changes 047 that are not propagated to the other files. As always, mirroring 048 code is a maintenance nightmare. */ 049 050/** 051 * A {@link DataBuffer} that uses an array of <code>short</code> primitives 052 * to represent each of its banks. 053 * 054 * @author Rolf W. Rasmussen (rolfwr@ii.uib.no) 055 */ 056public final class DataBufferUShort extends DataBuffer 057{ 058 private short[] data; 059 private short[][] bankData; 060 061 /** 062 * Creates a new data buffer with a single data bank containing the 063 * specified number of <code>short</code> elements. 064 * 065 * @param size the number of elements in the data bank. 066 */ 067 public DataBufferUShort(int size) 068 { 069 super(TYPE_USHORT, size, 1, 0); 070 bankData = new short[1][]; 071 data = new short[size]; 072 bankData[0] = data; 073 } 074 075 /** 076 * Creates a new data buffer with the specified number of data banks, 077 * each containing the specified number of <code>short</code> elements. 078 * 079 * @param size the number of elements in the data bank. 080 * @param numBanks the number of data banks. 081 */ 082 public DataBufferUShort(int size, int numBanks) 083 { 084 super(TYPE_USHORT, size, numBanks); 085 bankData = new short[numBanks][size]; 086 data = bankData[0]; 087 } 088 089 /** 090 * Creates a new data buffer backed by the specified data bank. 091 * 092 * @param dataArray the data bank. 093 * @param size the number of elements in the data bank. 094 * 095 * @throws NullPointerException if dataArray is null 096 */ 097 public DataBufferUShort(short[] dataArray, int size) 098 { 099 super(TYPE_USHORT, size, 1, 0); 100 if (dataArray == null) 101 throw new NullPointerException(); 102 bankData = new short[1][]; 103 data = dataArray; 104 bankData[0] = data; 105 } 106 107 /** 108 * Creates a new data buffer backed by the specified data bank, with 109 * the specified offset to the first element. 110 * 111 * @param dataArray the data bank. 112 * @param size the number of elements in the data bank. 113 * @param offset the offset to the first element in the array. 114 * 115 * @throws NullPointerException if dataArray is null 116 */ 117 public DataBufferUShort(short[] dataArray, int size, int offset) 118 { 119 super(TYPE_USHORT, size, 1, offset); 120 if (dataArray == null) 121 throw new NullPointerException(); 122 bankData = new short[1][]; 123 data = dataArray; 124 bankData[0] = data; 125 } 126 127 /** 128 * Creates a new data buffer backed by the specified data banks. 129 * 130 * @param dataArray the data banks. 131 * @param size the number of elements in the data bank. 132 * 133 * @throws NullPointerException if <code>dataArray</code> is 134 * <code>null</code>. 135 */ 136 public DataBufferUShort(short[][] dataArray, int size) 137 { 138 super(TYPE_USHORT, size, dataArray.length); 139 bankData = dataArray; 140 data = bankData[0]; 141 } 142 143 /** 144 * Creates a new data buffer backed by the specified data banks, with 145 * the specified offsets to the first element in each bank. 146 * 147 * @param dataArray the data banks. 148 * @param size the number of elements in the data bank. 149 * @param offsets the offsets to the first element in each data bank. 150 * 151 * @throws NullPointerException if <code>dataArray</code> is 152 * <code>null</code>. 153 */ 154 public DataBufferUShort(short[][] dataArray, int size, int[] offsets) 155 { 156 super(TYPE_USHORT, size, dataArray.length, offsets); 157 bankData = dataArray; 158 data = bankData[0]; 159 } 160 161 /** 162 * Returns the first data bank. 163 * 164 * @return The first data bank. 165 */ 166 public short[] getData() 167 { 168 return data; 169 } 170 171 /** 172 * Returns a data bank. 173 * 174 * @param bank the bank index. 175 * @return A data bank. 176 */ 177 public short[] getData(int bank) 178 { 179 return bankData[bank]; 180 } 181 182 /** 183 * Returns the array underlying this <code>DataBuffer</code>. 184 * 185 * @return The data banks. 186 */ 187 public short[][] getBankData() 188 { 189 return bankData; 190 } 191 192 /** 193 * Returns an element from the first data bank. The offset (specified in 194 * the constructor) is added to <code>i</code> before accessing the 195 * underlying data array. 196 * 197 * @param i the element index. 198 * @return The element. 199 */ 200 public int getElem(int i) 201 { 202 return data[i+offset] & 0xffff; // get unsigned short as int 203 } 204 205 /** 206 * Returns an element from a particular data bank. The offset (specified in 207 * the constructor) is added to <code>i</code> before accessing the 208 * underlying data array. 209 * 210 * @param bank the bank index. 211 * @param i the element index. 212 * @return The element. 213 */ 214 public int getElem(int bank, int i) 215 { 216 // get unsigned short as int 217 return bankData[bank][i+offsets[bank]] & 0xffff; 218 } 219 220 /** 221 * Sets an element in the first data bank. The offset (specified in the 222 * constructor) is added to <code>i</code> before updating the underlying 223 * data array. 224 * 225 * @param i the element index. 226 * @param val the new element value. 227 */ 228 public void setElem(int i, int val) 229 { 230 data[i+offset] = (short) val; 231 } 232 233 /** 234 * Sets an element in a particular data bank. The offset (specified in the 235 * constructor) is added to <code>i</code> before updating the underlying 236 * data array. 237 * 238 * @param bank the data bank index. 239 * @param i the element index. 240 * @param val the new element value. 241 */ 242 public void setElem(int bank, int i, int val) 243 { 244 bankData[bank][i+offsets[bank]] = (short) val; 245 } 246}