// **********************************************************************// // <copyright>// //  BBN Technologies//  10 Moulton Street//  Cambridge, MA 02138//  (617) 873-8000// //  Copyright (C) BBNT Solutions LLC. All rights reserved.// // </copyright>// **********************************************************************// // $Source: /cvs/distapps/openmap/src/openmap/com/bbn/openmap/image/JPEGHelper.java,v $// $RCSfile: JPEGHelper.java,v $// $Revision: 1.2.2.1 $// $Date: 2004/10/14 18:26:59 $// $Author: dietrick $// // **********************************************************************package com.bbn.openmap.image;import com.sun.image.codec.jpeg.*;import java.io.*;import java.awt.image.*;import java.net.URL;import com.bbn.openmap.util.Debug;/** * This class provides some utility methods for creating jpeg encoded * images. It relies on the Sun JDK/SDK JPEG codec classes. */public class JPEGHelper {    /**     * This class has only static methods, so there is no need to     * construct anything.     */    private JPEGHelper() {};    /**     * Return a byte array that contains the JPEG encoded image.     *      * @param image the image to encode     * @param quality the JPEG quality factor to use in encoding     * @exception IOException an error occured in encoding the image     */    public static byte[] encodeJPEG(BufferedImage image, float quality)            throws IOException {        ByteArrayOutputStream out = new ByteArrayOutputStream();        if (Debug.debugging("jpeghelper")) {            Debug.output("Got output stream..." + out);        }        JPEGEncodeParam param = JPEGCodec.getDefaultJPEGEncodeParam(image);        param.setQuality(quality, true);        if (Debug.debugging("jpeghelper")) {            Debug.output("Got encode params...");        }        JPEGImageEncoder enc = JPEGCodec.createJPEGEncoder(out, param);        if (Debug.debugging("jpeghelper")) {            Debug.output("Got jpeg encoder...");        }        enc.encode(image);        if (Debug.debugging("jpeghelper")) {            Debug.output("encoded?");        }        return out.toByteArray();    }    /**     * Return a byte array that contains the JPEG encoded image.     *      * @param w the width of the image     * @param h the height of the image     * @param pixels the array of pixels in RGB directcolor     * @param quality the JPEG quality factor to use in encoding     * @exception IOException an error occured in encoding the image     */    public static byte[] encodeJPEG(int w, int h, int[] pixels, float quality)            throws IOException {        BufferedImage bi = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);        bi.setRGB(0, 0, w, h, pixels, 0, w);        pixels = null;        return encodeJPEG(bi, quality);    }    /**     * A test main that encodes an image url at various jpeg quality     * factors.     *      * @param args url [width height]     */    public static void main(String args[]) throws Exception {        if (args.length == 0) {            System.out.println("java jpeg url [width height]");            System.exit(-1);        }        Debug.init();        int uw = -1;        int uh = -1;        if (args.length > 1) {            uw = Integer.parseInt(args[1]);            uh = Integer.parseInt(args[2]);        }        String urlsource = args[0];        int lastslash = urlsource.lastIndexOf('/');        if (lastslash == -1) {            lastslash = 0;        } else {            lastslash++;        }        int lastdot = urlsource.lastIndexOf('.');        if (lastdot == -1) {            lastdot = 0;        }        String filebase = urlsource.substring(lastslash, lastdot);        Debug.output("url=" + urlsource + " filebase=" + filebase);        BufferedImage bi = BufferedImageHelper.getBufferedImage(new URL(urlsource),                0,                0,                uw,                uh);        if (bi == null) {            Debug.error("JPEGHelper: Image load failed");        } else {            PrintStream html = new PrintStream(new FileOutputStream(new File(filebase                    + ".html")));            html.println("Source url = " + urlsource + " <br>");            html.println(" width = " + uw + " height=" + uh + " pixels=" + uw                    * uh + " <hr>");            for (int i = 0; i < 20; i++) {                File f = new File(filebase + ((i < 10) ? "0" : "") + i + ".jpg");                float quality = 0.0499f * i;                byte data[] = encodeJPEG(bi, quality);                OutputStream writef = new FileOutputStream(f);                writef.write(data);                writef.close();                html.println("Image Quality Factor: " + quality + " <br>");                html.println("Image Size (bytes) : " + data.length + " <br>");                html.println("<img src=\"" + f.getName() + "\"> <hr>");            }            html.close();        }        System.exit(-1); //awt stinks    }}