001 /* =========================================================== 002 * JFreeChart : a free chart library for the Java(tm) platform 003 * =========================================================== 004 * 005 * (C) Copyright 2000-2007, 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 * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 025 * in the United States and other countries.] 026 * 027 * ------------------------- 028 * SunPNGEncoderAdapter.java 029 * ------------------------- 030 * (C) Copyright 2004, 2007, by Richard Atkinson and Contributors. 031 * 032 * Original Author: Richard Atkinson; 033 * Contributor(s): -; 034 * 035 * $Id: SunPNGEncoderAdapter.java,v 1.3.2.3 2007/02/02 14:51:22 mungady Exp $ 036 * 037 * Changes 038 * ------- 039 * 01-Aug-2004 : Initial version (RA); 040 * 02-Feb-2007 : Removed author tags all over JFreeChart sources (DG); 041 * 042 */ 043 044 package org.jfree.chart.encoders; 045 046 import javax.imageio.ImageIO; 047 import java.awt.image.BufferedImage; 048 import java.io.OutputStream; 049 import java.io.ByteArrayOutputStream; 050 import java.io.IOException; 051 052 /** 053 * Adapter class for the Sun PNG Encoder. The ImageEncoderFactory will only 054 * return a reference to this class by default if the library has been compiled 055 * under a JDK 1.4+ and is being run using a JDK 1.4+. 056 */ 057 public class SunPNGEncoderAdapter implements ImageEncoder { 058 059 /** 060 * Get the quality of the image encoding (always 0.0). 061 * 062 * @return A float representing the quality. 063 */ 064 public float getQuality() { 065 return 0.0f; 066 } 067 068 /** 069 * Set the quality of the image encoding (not supported in this 070 * ImageEncoder). 071 * 072 * @param quality A float representing the quality. 073 */ 074 public void setQuality(float quality) { 075 // No op 076 } 077 078 /** 079 * Get whether the encoder should encode alpha transparency (always false). 080 * 081 * @return Whether the encoder is encoding alpha transparency. 082 */ 083 public boolean isEncodingAlpha() { 084 return false; 085 } 086 087 /** 088 * Set whether the encoder should encode alpha transparency (not 089 * supported in this ImageEncoder). 090 * 091 * @param encodingAlpha Whether the encoder should encode alpha 092 * transparency. 093 */ 094 public void setEncodingAlpha(boolean encodingAlpha) { 095 // No op 096 } 097 098 /** 099 * Encodes an image in PNG format. 100 * 101 * @param bufferedImage The image to be encoded. 102 * 103 * @return The byte[] that is the encoded image. 104 * 105 * @throws IOException 106 */ 107 public byte[] encode(BufferedImage bufferedImage) throws IOException { 108 ByteArrayOutputStream outputStream = new ByteArrayOutputStream(); 109 encode(bufferedImage, outputStream); 110 return outputStream.toByteArray(); 111 } 112 113 /** 114 * Encodes an image in PNG format and writes it to an OutputStream. 115 * 116 * @param bufferedImage The image to be encoded. 117 * @param outputStream The OutputStream to write the encoded image to. 118 * @throws IOException 119 */ 120 public void encode(BufferedImage bufferedImage, OutputStream outputStream) 121 throws IOException { 122 if (bufferedImage == null) { 123 throw new IllegalArgumentException("Null 'image' argument."); 124 } 125 if (outputStream == null) { 126 throw new IllegalArgumentException("Null 'outputStream' argument."); 127 } 128 ImageIO.write(bufferedImage, ImageFormat.PNG, outputStream); 129 } 130 131 }