Java Image to BufferedImage toBufferedImage(Image image)

Description

Returns a buffered image with the contents of an image Adapted from: http://www.exampledepot.com/egs/java.awt.image/HasAlpha.html

License

Open Source License

Parameter

Parameter	Description
image	a parameter

Declaration

public static BufferedImage toBufferedImage(Image image) 

Method Source Code

//package com.java2s;
/*/*w  ww  . ja v a  2 s .  c  o m*/
 * Copyright (C) 2010-2011 Pedro J Rivera
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This program 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 for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 * 
 */

import java.awt.Graphics;
import java.awt.GraphicsConfiguration;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import java.awt.HeadlessException;
import java.awt.Image;
import java.awt.Transparency;
import java.awt.image.BufferedImage;
import java.awt.image.ColorModel;
import java.awt.image.PixelGrabber;

import javax.swing.ImageIcon;

public class Main {
    /**
     * Returns a buffered image with the contents of an image
     * 
     * Adapted from: http://www.exampledepot.com/egs/java.awt.image/HasAlpha.html
     * 
     * @param image
     * @return
     */
    public static BufferedImage toBufferedImage(Image image) {
        if (image instanceof BufferedImage) {
            return (BufferedImage) image;
        }

        /*
         * This code ensures that all the pixels in the image are loaded
         */
        image = new ImageIcon(image).getImage();

        /*
         * Determine if the image has transparent pixels; for this method's
         * implementation, see Determining If an Image Has Transparent Pixels
         */
        boolean hasAlpha = hasAlpha(image);

        /*
         *  Create a buffered image with a format that's compatible with the screen
         */
        BufferedImage bimage = null;
        GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
        try {

            /*
             *  Determine the type of transparency of the new buffered image
             */
            int transparency = Transparency.OPAQUE;
            if (hasAlpha) {
                transparency = Transparency.BITMASK;
            }

            /*
             *  Create the buffered image
             */
            GraphicsDevice gs = ge.getDefaultScreenDevice();
            GraphicsConfiguration gc = gs.getDefaultConfiguration();
            bimage = gc.createCompatibleImage(image.getWidth(null), image.getHeight(null), transparency);
        } catch (HeadlessException e) {
            // The system does not have a screen
        }

        if (bimage == null) {
            /*
             * Create a buffered image using the default color model
             */
            int type = BufferedImage.TYPE_INT_RGB;
            if (hasAlpha) {
                type = BufferedImage.TYPE_INT_ARGB;
            }
            bimage = new BufferedImage(image.getWidth(null), image.getHeight(null), type);
        }

        /*
         *  Copy image to buffered image
         */
        Graphics g = bimage.createGraphics();

        /*
         *  Paint the image onto the buffered image
         */
        g.drawImage(image, 0, 0, null);
        g.dispose();

        return bimage;
    }

    /**
     * Returns true if the specified image has transparent pixels
     * 
     * Adapted from: http://www.exampledepot.com/egs/java.awt.image/Image2Buf.html
     *  
     * @param image
     * @return
     */
    public static boolean hasAlpha(Image image) {

        /*
         *  If buffered image, the color model is readily available
         */
        if (image instanceof BufferedImage) {
            BufferedImage bimage = (BufferedImage) image;
            return bimage.getColorModel().hasAlpha();
        }

        /*
         * Use a pixel grabber to retrieve the image's color model;
         * grabbing a single pixel is usually sufficient
         */
        PixelGrabber pg = new PixelGrabber(image, 0, 0, 1, 1, false);
        try {
            pg.grabPixels();
        } catch (InterruptedException e) {
        }

        /*
         *  Get the image's color model
         */
        ColorModel cm = pg.getColorModel();
        return cm.hasAlpha();
    }
}

Related

1. makeRGBABufferedImageFromImage( Image image)
2. toBufferedImage(Image i)
3. toBufferedImage(Image image)
4. toBufferedImage(Image image)
5. toBufferedImage(Image image)
6. toBufferedImage(Image image)
7. toBufferedImage(Image image)
8. toBufferedImage(Image image)
9. toBufferedImage(Image image)