01: /*
02: * Copyright 2000-2001 Sun Microsystems, Inc. All Rights Reserved.
03: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
04: *
05: * This code is free software; you can redistribute it and/or modify it
06: * under the terms of the GNU General Public License version 2 only, as
07: * published by the Free Software Foundation. Sun designates this
08: * particular file as subject to the "Classpath" exception as provided
09: * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
22: * CA 95054 USA or visit www.sun.com if you need additional information or
23: * have any questions.
24: */
25:
26: package sun.awt.image;
27:
28: import java.awt.image.DataBuffer;
29: import sun.java2d.SurfaceData;
30: import java.awt.Rectangle;
31:
32: /**
33: * This class extends <CODE>DataBuffer</CODE> and allows access to
34: * native data via the DataBuffer methods. Note that, unlike other
35: * DataBuffer classes, the data is not stored in this class but
36: * has been created and stored elsewhere and this class is used
37: * merely to access that data. Note also that this class subclasses
38: * from DataBuffer and not from any of the standard subclasses
39: * (e.g., DataBufferInt); those subclasses allow the user to
40: * get a pointer to the data and manipulate it directly. That
41: * operation may not be possible or wise with native data.
42: * One important use of this DataBuffer class is in accessing the
43: * data stored in an offscreen vram surface, such as that created
44: * by the createVolatileImage() method.
45: */
46:
47: public class DataBufferNative extends DataBuffer {
48: protected SurfaceData surfaceData;
49: protected int width;
50:
51: /**
52: * Constructor. The constructor of this object requires a
53: * SurfaceData object; that surfaceData object will be used
54: * to access the actual pixel data in native code.
55: */
56: public DataBufferNative(SurfaceData sData, int type, int width,
57: int height) {
58: super (type, width * height);
59: this .width = width;
60: this .surfaceData = sData;
61: }
62:
63: protected native int getElem(int x, int y, SurfaceData sData);
64:
65: /**
66: * getElem returns the pixel value for a given index into the
67: * dataBuffer array. The bank value is currently ignored (the
68: * type of data accessed through this class is not stored in
69: * separate banks). The x and y coordinates of a pixel are calculated
70: * from the index value and the native getElem() method is
71: * called with the internal surfaceData object.
72: */
73: public int getElem(int bank, int i) {
74: return getElem(i % width, i / width, surfaceData);
75: }
76:
77: protected native void setElem(int x, int y, int val,
78: 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: }
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