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| 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</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 | +} | |