imageutil.java

java servlet著名论坛源代码

/*
 * $Header: /cvsroot/mvnforum/myvietnam/src/net/myvietnam/mvncore/util/ImageUtil.java,v 1.12 2004/06/01 13:00:03 skoehler Exp $
 * $Author: skoehler $
 * $Revision: 1.12 $
 * $Date: 2004/06/01 13:00:03 $
 *
 * ====================================================================
 *
 * Copyright (C) 2002-2004 by MyVietnam.net
 *
 * 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 2
 * of the License, or any later version.
 *
 * All copyright notices regarding MyVietnam and MyVietnam CoreLib
 * MUST remain intact in the scripts and source code.
 *
 * 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * Correspondence and Marketing Questions can be sent to:
 * [e-mail]
 *
 * @author: Minh Nguyen  [e-mail]
 * @author: Mai  Nguyen  [e-mail]
 */
package net.myvietnam.mvncore.util;

import java.io.*;
import java.awt.image.BufferedImage;
import java.awt.geom.AffineTransform;
import java.awt.*;
import java.awt.image.*;
import javax.swing.ImageIcon;
import com.sun.image.codec.jpeg.*;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import net.myvietnam.mvncore.thirdparty.JpegEncoder;
import net.myvietnam.mvncore.exception.*;
import net.myvietnam.mvncore.util.FileUtil;

public final class ImageUtil {

    private static Log log = LogFactory.getLog(ImageUtil.class);

    private ImageUtil() {// prevent instantiation
    }

    /**
     * @todo: xem lai ham nay, neu kich thuoc nho hon max thi ta luu truc tiep
     *          inputStream xuong thumbnailFile luon
     *
     * This method create a thumbnail and reserve the ratio of the output image
     * NOTE: This method closes the inputStream after it have done its work.
     *
     * @param inputStream     the stream of a jpeg file
     * @param thumbnailFile   the output file, must have the ".jpg" extension
     * @param maxWidth        the maximun width of the image
     * @param maxHeight       the maximun height of the image
     * @throws IOException
     * @throws BadInputException
     * @throws AssertionException
     */
    public static void createThumbnail(InputStream inputStream, String thumbnailFile, int maxWidth, int maxHeight)
        throws IOException, BadInputException, AssertionException {
        //boolean useSun = false;
        String lowerName = thumbnailFile.toLowerCase();
        if (!lowerName.endsWith(".jpg")) throw new BadInputException("Cannot create a thumbnail with the extension other than '.jpg'.");

        OutputStream outputStream = null;
        try {
            //JPEGImageDecoder decoder = JPEGCodec.createJPEGDecoder(inputStream);
            //BufferedImage srcImage = decoder.decodeAsBufferedImage();
            byte[] srcByte = FileUtil.getBytes(inputStream);
            ImageIcon imageIcon = new ImageIcon(srcByte);
            Image srcImage = imageIcon.getImage();

            int imgWidth  = srcImage.getWidth(null);
            int imgHeight = srcImage.getHeight(null);
            //log.trace("width = " + imgWidth + " height = " + imgHeight);
            if ( (imgWidth <= 0) || (imgHeight <= 0) ) {
                // imgWidth or imgHeight could be -1, which is considered as an assertion
                throw new AssertionException("Assertion: ImageUtil: cannot get the image size.");
            }

            // Set the scale.
            AffineTransform tx = new AffineTransform();
            if ((imgWidth > maxWidth) || (imgHeight > maxHeight)) {
                double scaleX = (double)maxWidth/imgWidth;
                double scaleY = (double)maxHeight/imgHeight;
                double scaleRatio = (scaleX < scaleY) ? scaleX : scaleY;
                imgWidth  = (int)(imgWidth  * scaleRatio);
                imgHeight = (int)(imgHeight * scaleRatio);
                // scale as needed
                tx.scale(scaleRatio, scaleRatio);
            } else {// we dont need any transform here, just save it to file and return
                outputStream = new FileOutputStream(thumbnailFile);
                outputStream.write(srcByte);
                return;
            }

            // create thumbnail image
            BufferedImage bufferedImage = new BufferedImage(imgWidth, imgHeight, BufferedImage.TYPE_INT_RGB);

            Graphics2D g = bufferedImage.createGraphics();
            boolean useTransform = false;
            if (useTransform) {// use transfrom to draw
                //log.trace("use transform");
                g.drawImage(srcImage, tx, null);
            } else {// use java filter
                //log.trace("use filter");
                Image scaleImage = getScaledInstance(srcImage, imgWidth, imgHeight);
                g.drawImage(scaleImage, 0, 0, null);
            }
            g.dispose();// free resource

            // write it to disk
            outputStream = new FileOutputStream(thumbnailFile);
            JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(outputStream);
            encoder.encode(bufferedImage);
        } catch (IOException e) {
            log.error("Error", e);
            throw e;
        } finally {// this finally is very important
            inputStream.close();
            if (outputStream != null) outputStream.close();
        }
    }

    /**
     * This method returns a fit-sized image for a source image,
     * this method retains the ratio of the source image
     */
    public static Image getFitSizeImage(Image srcImage, int fitWidth, int fitHeight)
        throws IOException {
        if ((fitWidth < 100) || (fitHeight < 100)) throw new IllegalArgumentException("Cannot accept values < 100");

        int srcWidth  = srcImage.getWidth(null);//xem lai cho nay vi neu dung BufferedImage thi khong can null
        int srcHeight = srcImage.getHeight(null);
        //log.trace("src w = " + srcWidth + " h = " + srcHeight);

        // dont need any transforms
        if ((srcWidth == fitWidth) && (srcHeight == fitHeight)) return srcImage;

        int newWidth  = srcWidth;
        int newHeight = srcHeight;

        double fitRatio = (double)fitWidth / fitHeight;
        double srcRatio = (double)srcWidth / srcHeight;
        if (srcRatio > fitRatio) {// must cut the width of the source image
            newWidth = (int)(srcHeight * fitRatio);
        } else {// must cut the height of the source image
            newHeight = (int)(srcWidth / fitRatio);
        }
        //log.trace("new w = " + newWidth + " h = " + newHeight);

        ImageFilter cropFilter = new CropImageFilter((srcWidth-newWidth)/2, (srcHeight-newHeight)/2, newWidth, newHeight);
        ImageProducer cropProd = new FilteredImageSource(srcImage.getSource(), cropFilter);
        Image cropImage = Toolkit.getDefaultToolkit().createImage(cropProd);

        Image retImage = new ImageIcon(getScaledInstance(cropImage, fitWidth, fitHeight)).getImage();

        return retImage;
    }

    /**
     * This method returns a fit-sized image for a source image,
     * this method retains the ratio of the source image
     */
    public static Image getFitSizeImage(InputStream inputStream, int fitWidth, int fitHeight)
        throws IOException {
        try {
            JPEGImageDecoder decoder = JPEGCodec.createJPEGDecoder(inputStream);
            BufferedImage srcImage = decoder.decodeAsBufferedImage();

            return getFitSizeImage(srcImage, fitWidth, fitHeight);
        } catch (IOException e) {
            log.error("Cannot run getFitSizeImage", e);
            throw e;
        } finally {// this finally is very important
            inputStream.close();
        }
    }

    /**
     * This method write the image to a stream.
     * It auto detect the image is Image or BufferedImage.
     * This method close the output stream before it return.
     *
     * @param image Image
     * @param outputStream OutputStream
     * @throws IOException
     */
    public static void writeJpegImage_Sun(Image image, OutputStream outputStream) throws IOException {

        if (outputStream == null) {
            return;
        }

        try {
            BufferedImage bufferedImage = null;
            if (image instanceof BufferedImage) {
                bufferedImage = (BufferedImage)image;
            } else {
                // 30% cpu resource
                bufferedImage = new BufferedImage(image.getWidth(null), image.getHeight(null),
                                                  BufferedImage.TYPE_INT_RGB);

                // 7.5 cpu
                Graphics2D g = bufferedImage.createGraphics();

                // 50% cpu
                g.drawImage(image, 0, 0, null);
                g.dispose(); // free resource
            }

            // write it to disk
            // 12% cpu
            JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(outputStream);
            encoder.encode(bufferedImage);
        } finally {
            try {
                if (outputStream != null) {
                    outputStream.close();
                }
            } catch (IOException ex1) {
            }
        }
    }

    public static void writeJpegImage_Sun(Image image, String fileName) throws IOException {
        OutputStream outputStream = new FileOutputStream(fileName);
        writeJpegImage_Sun(image, outputStream);
    }

    /**
     * This method write image to output stream, then it close the stream before return
     *
     * @param image Image
     * @param outputStream OutputStream
     * @throws IOException
     */
    public static void writeJpegImage_nonSun(Image image, OutputStream outputStream) throws IOException {
        if (outputStream == null) {
            return;
        }
        try {
            JpegEncoder encoder = new JpegEncoder(image, 80, outputStream);
            encoder.Compress();
        } catch (Exception ex) {
        } finally {
            try {
                if (outputStream != null) {
                    outputStream.close();
                }
            } catch (IOException ex1) {
            }
        }
    }

    public static void writeJpegImage_nonSun(Image image, String fileName) throws IOException {
        OutputStream outputStream = new FileOutputStream(fileName);

        //this method will close the stream before it returns so no need to close
        writeJpegImage_nonSun(image, outputStream);
    }

    public static Image getScaledInstance(Image srcImage, int width, int height) {
        boolean useSun = false;
        ImageFilter filter;
        if (useSun){
            //log.trace("use sun scalefilter");
            filter = new java.awt.image.AreaAveragingScaleFilter(width, height);
        } else {
            //log.trace("use nguoimau scalefilter");
            filter = new net.myvietnam.mvncore.util.AreaAveragingScaleFilter(width, height);
        }
        ImageProducer prod = new FilteredImageSource(srcImage.getSource(), filter);
        Image newImage = Toolkit.getDefaultToolkit().createImage(prod);
        ImageIcon imageIcon = new ImageIcon(newImage);
        return imageIcon.getImage();
    }
/*
    public static void main(String[] args) {
        try {
            FileInputStream is = new FileInputStream("c:\\PUTTY.RND");
            createThumbnail(is, "c:\\out.jpg", 120, 120);