zkoss/zk

/* PNGEncoder.java

    Purpose:
        
    Description:
        
    History:
        Tue Jun 24 16:16:24     2008, Created by tomyeh

Copyright (C) 2008 Potix Corporation. All Rights Reserved.

{{IS_RIGHT
    This program is distributed under LGPL Version 2.1 in the hope that
    it will be useful, but WITHOUT ANY WARRANTY.
}}IS_RIGHT
*/
package org.zkoss.image.encoder;

import java.io.ByteArrayOutputStream;
import java.awt.image.RenderedImage;
import javax.imageio.ImageIO;

/**
 * The encoder for encoding an image into the PNG format
 *
 * @author tomyeh
 * @since 3.0.7
 */
public class PNGEncoder implements ImageEncoder {
    public PNGEncoder() {
    }

    public byte[] encode(RenderedImage image) throws java.io.IOException {
        ByteArrayOutputStream os = new ByteArrayOutputStream();
        ImageIO.write(image, "png", os);
        return os.toByteArray();
    }
    /** Always return 1.0 since no quality degrade.
     */
    public float getQuality() {
        return 1.0f;
    }
    public void setQuality(float quality) {
    }
    public boolean isEncodingAlpha() {
        return false;
    }
    public void setEncodingAlpha(boolean encodeAlpha) {
    }
}