Java BufferedImage to RGB imageToRGBABuffer(BufferedImage img)

Description

image To RGBA Buffer

License

Open Source License

Declaration

public static ByteBuffer imageToRGBABuffer(BufferedImage img) throws IOException 

Method Source Code

//package com.java2s;
/*/*  ww  w.ja v a 2s .c om*/
 * The MIT License (MIT)
 *
 * Copyright (c) 2014 The Voxel Plugineering Team
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

import java.awt.image.BufferedImage;
import java.awt.image.DataBufferByte;

import java.io.IOException;
import java.nio.ByteBuffer;

public class Main {
    public static ByteBuffer imageToRGBABuffer(BufferedImage img) throws IOException {
        ByteBuffer buf = null;

        // Decode the PNG file in a ByteBuffer
        buf = ByteBuffer.allocateDirect(4 * img.getWidth() * img.getHeight());
        byte[] pixels = ((DataBufferByte) img.getRaster().getDataBuffer()).getData();
        boolean hasAlpha = img.getAlphaRaster() != null;

        for (int pixel = 0; pixel < pixels.length; pixel += (hasAlpha ? 4 : 3)) {
            int offset = hasAlpha ? 1 : 0;
            buf.put(pixels[pixel + 2 + offset]);
            buf.put(pixels[pixel + 1 + offset]);
            buf.put(pixels[pixel + offset]);
            if (hasAlpha) {
                buf.put(pixels[pixel]);
            } else {
                buf.put((byte) 0);
            }
        }

        buf.flip();
        return buf;
    }
}

Related

1. getRGB(BufferedImage img)
2. getRgbFromImage(BufferedImage image)
3. getRGBPixels(BufferedImage img)
4. imageToMatrix(BufferedImage image)
5. imageToPixels(BufferedImage image)
6. imageToRgbaBufferedImage(final Image image)