DataBufferNIOInt.java

/*
 * Copyright (c) 2011, 2018, 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
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 */

package sun.java2d;

import java.awt.image.DataBuffer;
import java.nio.*;

public final class DataBufferNIOInt extends DataBuffer {

    /** The default data bank. */
    IntBuffer data;

    /** All data banks */
    IntBuffer[] bankdata;

    /**
     * Constructs an integer-based {@code DataBuffer} with a single bank
     * and the specified size.
     *
     * @param size The size of the {@code DataBuffer}.
     */
    public DataBufferNIOInt(int size) {
        super(TYPE_INT,size);
        //+++gdb how to get sizeof(int) in java? Using 4 for now.
        data = getBufferOfSize(size * 4).asIntBuffer();
        bankdata = new IntBuffer[1];
        bankdata[0] = data;
    }

    /**
     * Returns the default (first) IntBuffer in {@code DataBuffer}.
     *
     * @return The first IntBuffer.
     */
    public IntBuffer getBuffer() {
        return data;
    }

    /**
     * Returns the Buffer for the specified bank.
     *
     * @param bank The bank whose Buffer you want to get.
     * @return The Buffer for the specified bank.
     */
    public IntBuffer getBuffer(int bank) {
        return bankdata[bank];
    }

    /**
     * Returns the default (first) int data array in {@code DataBuffer}.
     *
     * @return The first integer data array.
     */
    public int[] getData() {
        return data.array();
    }

    /**
     * Returns the data array for the specified bank.
     *
     * @param bank The bank whose data array you want to get.
     * @return The data array for the specified bank.
     */
    public int[] getData(int bank) {
        return bankdata[bank].array();
    }

    /**
     * Returns the data arrays for all banks.
     * @return All of the data arrays.
     */
    public int[][] getBankData() {
        // Unsupported.
        return null;
    }

    /**
     * Returns the requested data array element from the first (default) bank.
     *
     * @param i The data array element you want to get.
     * @return The requested data array element as an integer.
     * @see #setElem(int, int)
     * @see #setElem(int, int, int)
     */
    public int getElem(int i) {
        return data.get(i+offset);
    }

    /**
     * Returns the requested data array element from the specified bank.
     *
     * @param bank The bank from which you want to get a data array element.
     * @param i The data array element you want to get.
     * @return The requested data array element as an integer.
     * @see #setElem(int, int)
     * @see #setElem(int, int, int)
     */
    public int getElem(int bank, int i) {
        return bankdata[bank].get(i+offsets[bank]);
    }

    /**
     * Sets the requested data array element in the first (default) bank
     * to the specified value.
     *
     * @param i The data array element you want to set.
     * @param val The integer value to which you want to set the data array element.
     * @see #getElem(int)
     * @see #getElem(int, int)
     */
    public void setElem(int i, int val) {
        data.put(i+offset, val);
    }

    /**
     * Sets the requested data array element in the specified bank
     * to the integer value {@code i}.
     * @param bank The bank in which you want to set the data array element.
     * @param i The data array element you want to set.
     * @param val The integer value to which you want to set the specified data array element.
     * @see #getElem(int)
     * @see #getElem(int, int)
     */
    public void setElem(int bank, int i, int val) {
        bankdata[bank].put(i+offsets[bank], val);
    }

    ByteBuffer getBufferOfSize(int size)
    {
        ByteBuffer buffer = ByteBuffer.allocateDirect(size);
        buffer.order(ByteOrder.nativeOrder());
        return buffer;
    }
}