/* * Copyright (c) 2000, 2001, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation.  Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */  package sun.awt.image; import java.awt.image.DataBuffer;import sun.java2d.SurfaceData;import java.awt.Rectangle; /** * This class extends <CODE>DataBuffer</CODE> and allows access to * native data via the DataBuffer methods.  Note that, unlike other * DataBuffer classes, the data is not stored in this class but * has been created and stored elsewhere and this class is used * merely to access that data.  Note also that this class subclasses * from DataBuffer and not from any of the standard subclasses * (e.g., DataBufferInt); those subclasses allow the user to * get a pointer to the data and manipulate it directly.  That * operation may not be possible or wise with native data. * One important use of this DataBuffer class is in accessing the * data stored in an offscreen vram surface, such as that created * by the createVolatileImage() method. */ public class DataBufferNative extends DataBuffer{    protected SurfaceData surfaceData;    protected int width;     /**     * Constructor.  The constructor of this object requires a     * SurfaceData object; that surfaceData object will be used     * to access the actual pixel data in native code.     */    public DataBufferNative(SurfaceData sData, int type, int width, int height) {        super(type, width*height);        this.width = width;        this.surfaceData = sData;    }     protected native int getElem(int x, int y, SurfaceData sData);     /**     * getElem returns the pixel value for a given index into the     * dataBuffer array.  The bank value is currently ignored (the     * type of data accessed through this class is not stored in     * separate banks).  The x and y coordinates of a pixel are calculated     * from the index value and the native getElem() method is     * called with the internal surfaceData object.     */    public int getElem(int bank, int i) {        return getElem(i % width, i / width, surfaceData);    }     protected native void setElem(int x, int y, int val, SurfaceData sData);     /**     * setElem sets the pixel value of a given index into the     * dataBuffer array.  The bank value is currently ignored (the     * type of data accessed through this class is not stored in     * separate banks).  The x and y coordinates of a pixel are calculated     * from the index value and the native setElem() method is     * called with the internal surfaceData object.     */    public void setElem(int bank, int i, int val) {        setElem(i % width, i / width, val, surfaceData);    } }