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 */ DataBufferNative(SurfaceData sData, int type, int width, int height)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 getElem(int x, int y, SurfaceData sData)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 */ getElem(int bank, int i)74 public int getElem(int bank, int i) { 75 return getElem(i % width, i / width, surfaceData); 76 } 77 setElem(int x, int y, int val, SurfaceData sData)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 */ setElem(int bank, int i, int val)88 public void setElem(int bank, int i, int val) { 89 setElem(i % width, i / width, val, surfaceData); 90 } 91 92 } 93