J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2000-2001 Sun Microsystems, Inc. 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. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * 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 | |
| 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</CODE> 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 | } |