    001/* ===========================================================
    002 * JFreeChart : a free chart library for the Java(tm) platform
    003 * ===========================================================
    004 *
    005 * (C) Copyright 2000-2011, by Object Refinery Limited and Contributors.
    006 *
    007 * Project Info:  http://www.jfree.org/jfreechart/index.html
    008 *
    009 * This library is free software; you can redistribute it and/or modify it
    010 * under the terms of the GNU Lesser General Public License as published by
    011 * the Free Software Foundation; either version 2.1 of the License, or
    012 * (at your option) any later version.
    013 *
    014 * This library is distributed in the hope that it will be useful, but
    015 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
    016 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
    017 * License for more details.
    018 *
    019 * You should have received a copy of the GNU Lesser General Public
    020 * License along with this library; if not, write to the Free Software
    021 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
    022 * USA.
    023 *
    024 * [Oracle and Java are registered trademarks of Oracle and/or its affiliates.
    025 * Other names may be trademarks of their respective owners.]
    026 *
    027 * ------------------------------
    028 * KeypointPNGEncoderAdapter.java
    029 * ------------------------------
    030 * (C) Copyright 2004-2008, by Richard Atkinson and Contributors.
    031 *
    032 * Original Author:  Richard Atkinson;
    033 * Contributor(s):   -;
    034 *
    035 * Changes
    036 * -------
    037 * 01-Aug-2004 : Initial version (RA);
    038 * 02-Feb-2007 : Removed author tags all over JFreeChart sources (DG);
    039 *
    040 */
    041
    042package org.jfree.chart.encoders;
    043
    044import java.awt.image.BufferedImage;
    045import java.io.IOException;
    046import java.io.OutputStream;
    047
    048import com.keypoint.PngEncoder;
    049
    050/**
    051 * Adapter class for the Keypoint PNG Encoder.  The ImageEncoderFactory will
    052 * only return a reference to this class by default if the library has been
    053 * compiled under a JDK < 1.4 or is being run using a JDK < 1.4.
    054 */
    055public class KeypointPNGEncoderAdapter implements ImageEncoder {
    056
    057    /** The quality setting. */
    058    private int quality = 9;
    059
    060    /** Encode alpha? */
    061    private boolean encodingAlpha = false;
    062
    063    /**
    064     * Get the quality of the image encoding.  The underlying encoder uses int
    065     * values:  0 for no compression, and values 1 through 9 for various levels
    066     * of compression (1 is best speed, 9 is best compression).
    067     *
    068     * @return A float representing the quality.
    069     */
    070    public float getQuality() {
    071        return this.quality;
    072    }
    073
    074    /**
    075     * Set the quality of the image encoding (supported).  The underlying
    076     * encoder uses int values:  0 for no compression, and values 1 through 9
    077     * for various levels of compression (1 is best speed, 9 is best
    078     * compression).
    079     *
    080     * @param quality  A float representing the quality.
    081     */
    082    public void setQuality(float quality) {
    083        this.quality = (int) quality;
    084    }
    085
    086    /**
    087     * Get whether the encoder should encode alpha transparency.
    088     *
    089     * @return Whether the encoder is encoding alpha transparency.
    090     */
    091    public boolean isEncodingAlpha() {
    092        return this.encodingAlpha;
    093    }
    094
    095    /**
    096     * Set whether the encoder should encode alpha transparency (supported).
    097     *
    098     * @param encodingAlpha  Whether the encoder should encode alpha
    099     *                       transparency.
    100     */
    101    public void setEncodingAlpha(boolean encodingAlpha) {
    102        this.encodingAlpha = encodingAlpha;
    103    }
    104
    105    /**
    106     * Encodes an image in PNG format.
    107     *
    108     * @param bufferedImage  The image to be encoded.
    109     * @return The byte[] that is the encoded image.
    110     * @throws IOException
    111     */
    112    public byte[] encode(BufferedImage bufferedImage) throws IOException {
    113        if (bufferedImage == null) {
    114            throw new IllegalArgumentException("Null 'image' argument.");
    115        }
    116        PngEncoder encoder = new PngEncoder(bufferedImage, this.encodingAlpha,
    117                0, this.quality);
    118        return encoder.pngEncode();
    119    }
    120
    121    /**
    122     * Encodes an image in PNG format and writes it to an
    123     * <code>OutputStream</code>.
    124     *
    125     * @param bufferedImage  The image to be encoded.
    126     * @param outputStream  The OutputStream to write the encoded image to.
    127     * @throws IOException
    128     */
    129    public void encode(BufferedImage bufferedImage, OutputStream outputStream)
    130        throws IOException {
    131        if (bufferedImage == null) {
    132            throw new IllegalArgumentException("Null 'image' argument.");
    133        }
    134        if (outputStream == null) {
    135            throw new IllegalArgumentException("Null 'outputStream' argument.");
    136        }
    137        PngEncoder encoder = new PngEncoder(bufferedImage, this.encodingAlpha,
    138                0, this.quality);
    139        outputStream.write(encoder.pngEncode());
    140    }
    141
    142}