summaryrefslogtreecommitdiff
path: root/libjava/classpath/java/awt/image/DataBuffer.java
blob: 78bc75ba510f815188c5d56fc99ff779b4d27eb0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
/* Copyright (C) 2000, 2002, 2005  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., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 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;

/**
 * Class that manages arrays of data elements. A data buffer consists
 * of one or more banks.  A bank is a continuous region of data
 * elements.
 *
 * @author Rolf W. Rasmussen (rolfwr@ii.uib.no)
 */
public abstract class DataBuffer
{
  /**
   * A constant representing a data type that uses <code>byte</code> primitives
   * as the storage unit.
   */
  public static final int TYPE_BYTE      =  0;

  /**
   * A constant representing a data type that uses <code>short</code>
   * primitives as the storage unit.
   */
  public static final int TYPE_USHORT    =  1;

  /**
   * A constant representing a data type that uses <code>short</code>
   * primitives as the storage unit.
   */
  public static final int TYPE_SHORT     =  2;

  /**
   * A constant representing a data type that uses <code>int</code>
   * primitives as the storage unit.
   */
  public static final int TYPE_INT       =  3;

  /**
   * A constant representing a data type that uses <code>float</code>
   * primitives as the storage unit.
   */
  public static final int TYPE_FLOAT     =  4;

  /**
   * A constant representing a data type that uses <code>double</code>
   * primitives as the storage unit.
   */
  public static final int TYPE_DOUBLE    =  5;

  /**
   * A constant representing an undefined data type.
   */
  public static final int TYPE_UNDEFINED = 32;

  /** The type of the data elements stored in the data buffer.  */
  protected int dataType;

  /** The number of banks in this buffer.  */
  protected int banks = 1;

  /** Offset into the default (0'th) bank). */
  protected int offset; // FIXME: Is offsets[0] always mirrored in offset?

  /** The size of the banks.  */
  protected int size;

  /** Offset into each bank.  */
  protected int[] offsets;

  /**
   * Creates a new <code>DataBuffer</code> with the specified data type and
   * size.  The <code>dataType</code> should be one of the constants
   * {@link #TYPE_BYTE}, {@link #TYPE_SHORT}, {@link #TYPE_USHORT},
   * {@link #TYPE_INT}, {@link #TYPE_FLOAT} and {@link #TYPE_DOUBLE}.
   * <p>
   * The physical (array-based) storage is allocated by a subclass.
   *
   * @param dataType the data type.
   * @param size the number of elements in the buffer.
   */
  protected DataBuffer(int dataType, int size)
  {
    this(dataType, size, 1);
  }

  /**
   * Creates a new <code>DataBuffer</code> with the specified data type,
   * size and number of banks.  The <code>dataType</code> should be one of
   * the constants {@link #TYPE_BYTE}, {@link #TYPE_SHORT},
   * {@link #TYPE_USHORT}, {@link #TYPE_INT}, {@link #TYPE_FLOAT} and
   * {@link #TYPE_DOUBLE}.
   * <p>
   * The physical (array-based) storage is allocated by a subclass.
   *
   * @param dataType the data type.
   * @param size the number of elements in the buffer.
   * @param numBanks the number of data banks.
   */
  protected DataBuffer(int dataType, int size, int numBanks) {
    this(dataType, size, numBanks, 0);
  }

  /**
   * Creates a new <code>DataBuffer</code> with the specified data type,
   * size and number of banks.  An offset (which applies to all banks) is
   * also specified.  The <code>dataType</code> should be one of
   * the constants {@link #TYPE_BYTE}, {@link #TYPE_SHORT},
   * {@link #TYPE_USHORT}, {@link #TYPE_INT}, {@link #TYPE_FLOAT} and
   * {@link #TYPE_DOUBLE}.
   * <p>
   * The physical (array-based) storage is allocated by a subclass.
   *
   * @param dataType the data type.
   * @param size the number of elements in the buffer.
   * @param numBanks the number of data banks.
   * @param offset the offset to the first element for all banks.
   */
  protected DataBuffer(int dataType, int size, int numBanks, int offset) {
    banks = numBanks;
    this.dataType = dataType;
    this.size = size;
    this.offset = offset;

    offsets = new int[ numBanks ];
    for(int i = 0; i < numBanks; i++ )
      offsets[i] = offset;
  }

  /**
   * Creates a new <code>DataBuffer</code> with the specified data type,
   * size and number of banks.  An offset (which applies to all banks) is
   * also specified.  The <code>dataType</code> should be one of
   * the constants {@link #TYPE_BYTE}, {@link #TYPE_SHORT},
   * {@link #TYPE_USHORT}, {@link #TYPE_INT}, {@link #TYPE_FLOAT} and
   * {@link #TYPE_DOUBLE}.
   * <p>
   * The physical (array-based) storage is allocated by a subclass.
   *
   * @param dataType the data type.
   * @param size the number of elements in the buffer.
   * @param numBanks the number of data banks.
   * @param offsets the offsets to the first element for all banks.
   *
   * @throws ArrayIndexOutOfBoundsException if
   *         <code>numBanks != offsets.length</code>.
   */
  protected DataBuffer(int dataType, int size, int numBanks, int[] offsets) {
    if (numBanks != offsets.length)
      throw new ArrayIndexOutOfBoundsException();

    this.dataType = dataType;
    this.size = size;
    banks = numBanks;
    this.offsets = offsets;

    offset = offsets[0];
  }

  /**
   * Returns the size (number of bits) of the specified data type. Valid types
   * are defined by the constants {@link #TYPE_BYTE}, {@link #TYPE_SHORT},
   * {@link #TYPE_USHORT}, {@link #TYPE_INT}, {@link #TYPE_FLOAT} and
   * {@link #TYPE_DOUBLE}.
   *
   * @param dataType the data type.
   * @return The number of bits for the specified data type.
   * @throws IllegalArgumentException if <code>dataType < 0</code> or
   *         <code>dataType > TYPE_DOUBLE</code>.
   */
  public static int getDataTypeSize(int dataType) {
    // Maybe this should be a lookup table instead.
    switch (dataType)
      {
      case TYPE_BYTE:
        return 8;
      case TYPE_USHORT:
      case TYPE_SHORT:
        return 16;
      case TYPE_INT:
      case TYPE_FLOAT:
        return 32;
      case TYPE_DOUBLE:
        return 64;
      default:
        throw new IllegalArgumentException();
      }
  }

  /**
   * Returns the type of the data elements in the data buffer.  Valid types
   * are defined by the constants {@link #TYPE_BYTE}, {@link #TYPE_SHORT},
   * {@link #TYPE_USHORT}, {@link #TYPE_INT}, {@link #TYPE_FLOAT} and
   * {@link #TYPE_DOUBLE}.
   *
   * @return The type.
   */
  public int getDataType()
  {
    return dataType;
  }

  /**
   * Returns the size of the data buffer.
   *
   * @return The size.
   */
  public int getSize()
  {
    return size;
  }

  /**
   * Returns the element offset for the first data bank.
   *
   * @return The element offset.
   */
  public int getOffset()
  {
    return offset;
  }

  /**
   * Returns the offsets for all the data banks used by this
   * <code>DataBuffer</code>.
   *
   * @return The offsets.
   */
  public int[] getOffsets()
  {
    if (offsets == null)
    {
      // is this necessary?
      offsets = new int[1];
      offsets[0] = offset;
    }
    return offsets;
  }

  /**
   * Returns the number of data banks for this <code>DataBuffer</code>.
   * @return The number of data banks.
   */
  public int getNumBanks()
  {
    return banks;
  }

  /**
   * 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 getElem(0, i);
  }

  /**
   * 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 abstract int getElem(int bank, int i);

  /**
   * 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)
  {
    setElem(0, i, 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 abstract void setElem(int bank, int i, int val);

  /**
   * Returns an element from the first data bank, converted to a
   * <code>float</code>.  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 float getElemFloat(int i)
  {
    return getElem(i);
  }

  /**
   * Returns an element from a particular data bank, converted to a
   * <code>float</code>.  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 float getElemFloat(int bank, int i)
  {
    return getElem(bank, i);
  }

  /**
   * 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 setElemFloat(int i, float val)
  {
    setElem(i, (int) 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 setElemFloat(int bank, int i, float val)
  {
    setElem(bank, i, (int) val);
  }

  /**
   * Returns an element from the first data bank, converted to a
   * <code>double</code>.  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 double getElemDouble(int i)
  {
    return getElem(i);
  }

  /**
   * Returns an element from a particular data bank, converted to a
   * <code>double</code>.  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 double getElemDouble(int bank, int i)
  {
    return getElem(bank, i);
  }

  /**
   * 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 setElemDouble(int i, double val)
  {
    setElem(i, (int) 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 setElemDouble(int bank, int i, double val)
  {
    setElem(bank, i, (int) val);
  }
}