001 /* Copyright (C) 2004, 2005 Free Software Foundation 002 003 This file is part of GNU Classpath. 004 005 GNU Classpath is free software; you can redistribute it and/or modify 006 it under the terms of the GNU General Public License as published by 007 the Free Software Foundation; either version 2, or (at your option) 008 any later version. 009 010 GNU Classpath is distributed in the hope that it will be useful, but 011 WITHOUT ANY WARRANTY; without even the implied warranty of 012 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 013 General Public License for more details. 014 015 You should have received a copy of the GNU General Public License 016 along with GNU Classpath; see the file COPYING. If not, write to the 017 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 018 02110-1301 USA. 019 020 Linking this library statically or dynamically with other modules is 021 making a combined work based on this library. Thus, the terms and 022 conditions of the GNU General Public License cover the whole 023 combination. 024 025 As a special exception, the copyright holders of this library give you 026 permission to link this library with independent modules to produce an 027 executable, regardless of the license terms of these independent 028 modules, and to copy and distribute the resulting executable under 029 terms of your choice, provided that you also meet, for each linked 030 independent module, the terms and conditions of the license of that 031 module. An independent module is a module which is not derived from 032 or based on this library. If you modify this library, you may extend 033 this exception to your version of the library, but you are not 034 obligated to do so. If you do not wish to do so, delete this 035 exception statement from your version. */ 036 037 package java.awt.image; 038 039 /* This is one of several classes that are nearly identical. Maybe we 040 should have a central template and generate all these files. This 041 is one of the cases where templates or macros would have been 042 useful to have in Java. 043 044 This file has been created using search-replace. My only fear is 045 that these classes will grow out-of-sync as of a result of changes 046 that are not propagated to the other files. As always, mirroring 047 code is a maintenance nightmare. */ 048 049 /** 050 * A {@link DataBuffer} that uses an array of <code>float</code> primitives 051 * to represent each of its banks. 052 * 053 * @author Rolf W. Rasmussen (rolfwr@ii.uib.no) 054 * @author Sascha Brawer (brawer@dandelis.ch) 055 */ 056 public final class DataBufferFloat 057 extends DataBuffer 058 { 059 private float[] data; 060 private float[][] bankData; 061 062 /** 063 * Creates a new data buffer with a single data bank containing the 064 * specified number of <code>float</code> elements. 065 * 066 * @param size the number of elements in the data bank. 067 */ 068 public DataBufferFloat(int size) 069 { 070 super(TYPE_FLOAT, size, 1, 0); 071 bankData = new float[1][]; 072 data = new float[size]; 073 bankData[0] = data; 074 } 075 076 /** 077 * Creates a new data buffer with the specified number of data banks, 078 * each containing the specified number of <code>float</code> elements. 079 * 080 * @param size the number of elements in the data bank. 081 * @param numBanks the number of data banks. 082 */ 083 public DataBufferFloat(int size, int numBanks) 084 { 085 super(TYPE_FLOAT, size, numBanks); 086 bankData = new float[numBanks][size]; 087 data = bankData[0]; 088 } 089 090 /** 091 * Creates a new data buffer backed by the specified data bank. 092 * <p> 093 * Note: there is no exception when <code>dataArray</code> is 094 * <code>null</code>, but in that case an exception will be thrown 095 * later if you attempt to access the data buffer. 096 * 097 * @param dataArray the data bank. 098 * @param size the number of elements in the data bank. 099 */ 100 public DataBufferFloat(float[] dataArray, int size) 101 { 102 super(TYPE_FLOAT, size, 1, 0); 103 bankData = new float[1][]; 104 data = dataArray; 105 bankData[0] = data; 106 } 107 108 /** 109 * Creates a new data buffer backed by the specified data bank, with 110 * the specified offset to the first element. 111 * <p> 112 * Note: there is no exception when <code>dataArray</code> is 113 * <code>null</code>, but in that case an exception will be thrown 114 * later if you attempt to access the data buffer. 115 * 116 * @param dataArray the data bank. 117 * @param size the number of elements in the data bank. 118 * @param offset the offset to the first element in the array. 119 */ 120 public DataBufferFloat(float[] dataArray, int size, int offset) 121 { 122 super(TYPE_FLOAT, size, 1, offset); 123 bankData = new float[1][]; 124 data = dataArray; 125 bankData[0] = data; 126 } 127 128 /** 129 * Creates a new data buffer backed by the specified data banks. 130 * 131 * @param dataArray the data banks. 132 * @param size the number of elements in the data bank. 133 * 134 * @throws NullPointerException if <code>dataArray</code> is 135 * <code>null</code>. 136 */ 137 public DataBufferFloat(float[][] dataArray, int size) 138 { 139 super(TYPE_FLOAT, size, dataArray.length); 140 bankData = dataArray; 141 data = bankData[0]; 142 } 143 144 /** 145 * Creates a new data buffer backed by the specified data banks, with 146 * the specified offsets to the first element in each bank. 147 * 148 * @param dataArray the data banks. 149 * @param size the number of elements in the data bank. 150 * @param offsets the offsets to the first element in each data bank. 151 * 152 * @throws NullPointerException if <code>dataArray</code> is 153 * <code>null</code>. 154 */ 155 public DataBufferFloat(float[][] dataArray, int size, int[] offsets) 156 { 157 super(TYPE_FLOAT, size, dataArray.length, offsets); 158 bankData = dataArray; 159 data = bankData[0]; 160 } 161 162 /** 163 * Returns the first data bank. 164 * 165 * @return The first data bank. 166 */ 167 public float[] getData() 168 { 169 return data; 170 } 171 172 /** 173 * Returns a data bank. 174 * 175 * @param bank the bank index. 176 * @return A data bank. 177 */ 178 public float[] getData(int bank) 179 { 180 return bankData[bank]; 181 } 182 183 /** 184 * Returns the array underlying this <code>DataBuffer</code>. 185 * 186 * @return The data banks. 187 */ 188 public float[][] getBankData() 189 { 190 return bankData; 191 } 192 193 /** 194 * Returns an element from the first data bank. The offset (specified in 195 * the constructor) is added to <code>i</code> before accessing the 196 * underlying data array. 197 * 198 * @param i the element index. 199 * @return The element. 200 */ 201 public int getElem(int i) 202 { 203 return (int) data[i+offset]; 204 } 205 206 /** 207 * Returns an element from a particular data bank. The offset (specified in 208 * the constructor) is added to <code>i</code> before accessing the 209 * underlying data array. 210 * 211 * @param bank the bank index. 212 * @param i the element index. 213 * @return The element. 214 */ 215 public int getElem(int bank, int i) 216 { 217 return (int) bankData[bank][i+offsets[bank]]; 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] = 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]] = val; 245 } 246 247 public float getElemFloat(int i) 248 { 249 return data[i+offset]; 250 } 251 252 public float getElemFloat(int bank, int i) 253 { 254 return bankData[bank][i+offsets[bank]]; 255 } 256 257 public void setElemFloat(int i, float val) 258 { 259 data[i+offset] = val; 260 } 261 262 public void setElemFloat(int bank, int i, float val) 263 { 264 bankData[bank][i+offsets[bank]] = val; 265 } 266 267 public double getElemDouble(int i) 268 { 269 return getElemFloat(i); 270 } 271 272 public double getElemDouble(int bank, int i) 273 { 274 return getElemFloat(bank, i); 275 } 276 277 public void setElemDouble(int i, double val) 278 { 279 setElemFloat(i, (float) val); 280 } 281 282 public void setElemDouble(int bank, int i, double val) 283 { 284 setElemFloat(bank, i, (float) val); 285 } 286 }