1 /*
2 * Copyright (c) 2000, 2001, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26
27 package sun.awt.image;
28
29 import java.awt.image.DataBuffer;
30 import sun.java2d.SurfaceData;
31 import java.awt.Rectangle;
32
33 /**
34 * This class extends {@code DataBuffer} and allows access to
35 * native data via the DataBuffer methods. Note that, unlike other
36 * DataBuffer classes, the data is not stored in this class but
37 * has been created and stored elsewhere and this class is used
38 * merely to access that data. Note also that this class subclasses
39 * from DataBuffer and not from any of the standard subclasses
40 * (e.g., DataBufferInt); those subclasses allow the user to
41 * get a pointer to the data and manipulate it directly. That
42 * operation may not be possible or wise with native data.
43 * One important use of this DataBuffer class is in accessing the
44 * data stored in an offscreen vram surface, such as that created
45 * by the createVolatileImage() method.
46 */
47
48 public class DataBufferNative extends DataBuffer
49 {
50 protected SurfaceData surfaceData;
51 protected int width;
52
53 /**
54 * Constructor. The constructor of this object requires a
55 * SurfaceData object; that surfaceData object will be used
56 * to access the actual pixel data in native code.
57 */
58 public DataBufferNative(SurfaceData sData, int type, int width, int height) {
59 super(type, width*height);
60 this.width = width;
61 this.surfaceData = sData;
62 }
63
64 protected native int getElem(int x, int y, SurfaceData sData);
65
66 /**
67 * getElem returns the pixel value for a given index into the
68 * dataBuffer array. The bank value is currently ignored (the
69 * type of data accessed through this class is not stored in
70 * separate banks). The x and y coordinates of a pixel are calculated
71 * from the index value and the native getElem() method is
72 * called with the internal surfaceData object.
73 */
74 public int getElem(int bank, int i) {
75 return getElem(i % width, i / width, surfaceData);
76 }
77
78 protected native void setElem(int x, int y, int val, SurfaceData sData);
79
80 /**
81 * setElem sets the pixel value of a given index into the
82 * dataBuffer array. The bank value is currently ignored (the
83 * type of data accessed through this class is not stored in
84 * separate banks). The x and y coordinates of a pixel are calculated
85 * from the index value and the native setElem() method is
86 * called with the internal surfaceData object.
87 */
88 public void setElem(int bank, int i, int val) {
89 setElem(i % width, i / width, val, surfaceData);
90 }
91
92 }
--- EOF ---