/*****************************************************************************
* Copyright (C) The Apache Software Foundation. All rights reserved. *
* ------------------------------------------------------------------------- *
* This software is published under the terms of the Apache Software License *
* version 1.1, a copy of which has been included with this distribution in *
* the LICENSE file. *
*****************************************************************************/
package org.apache.batik.ext.awt.image.spi;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.awt.image.ColorModel;
import java.awt.image.WritableRaster;
import java.io.IOException;
import java.io.InputStream;
import org.apache.batik.ext.awt.image.codec.PNGDecodeParam;
import org.apache.batik.ext.awt.image.codec.PNGRed;
import org.apache.batik.ext.awt.image.GraphicsUtil;
import org.apache.batik.ext.awt.image.renderable.DeferRable;
import org.apache.batik.ext.awt.image.renderable.Filter;
import org.apache.batik.ext.awt.image.renderable.RedRable;
import org.apache.batik.ext.awt.image.rendered.Any2sRGBRed;
import org.apache.batik.ext.awt.image.rendered.CachableRed;
import org.apache.batik.ext.awt.image.rendered.FormatRed;
import org.apache.batik.util.ParsedURL;
public class PNGRegistryEntry
extends MagicNumberRegistryEntry {
static final byte [] signature = {(byte)0x89, 80, 78, 71, 13, 10, 26, 10};
public PNGRegistryEntry() {
super("PNG", "png", "image/png", 0, signature);
}
/**
* Decode the Stream into a RenderableImage
*
* @param is The input stream that contains the image.
* @param origURL The original URL, if any, for documentation
* purposes only. This may be null.
* @param needRawData If true the image returned should not have
* any default color correction the file may
* specify applied. */
public Filter handleStream(InputStream inIS,
ParsedURL origURL,
boolean needRawData) {
final DeferRable dr = new DeferRable();
final InputStream is = inIS;
final boolean raw = needRawData;
final String errCode;
final Object [] errParam;
if (origURL != null) {
errCode = ERR_URL_FORMAT_UNREADABLE;
errParam = new Object[] {"PNG", origURL};
} else {
errCode = ERR_STREAM_FORMAT_UNREADABLE;
errParam = new Object[] {"PNG"};
}
Thread t = new Thread() {
public void run() {
Filter filt;
try {
PNGDecodeParam param = new PNGDecodeParam();
param.setExpandPalette(true);
if (raw)
param.setPerformGammaCorrection(false);
else {
param.setPerformGammaCorrection(true);
param.setDisplayExponent(2.2f); // sRGB gamma
}
CachableRed cr = new PNGRed(is, param);
dr.setBounds(new Rectangle2D.Double
(0, 0, cr.getWidth(), cr.getHeight()));
cr = new Any2sRGBRed(cr);
cr = new FormatRed(cr, GraphicsUtil.sRGB_Unpre);
WritableRaster wr = (WritableRaster)cr.getData();
ColorModel cm = cr.getColorModel();
BufferedImage image;
image = new BufferedImage
(cm, wr, cm.isAlphaPremultiplied(), null);
cr = GraphicsUtil.wrap(image);
filt = new RedRable(cr);
} catch (IOException ioe) {
filt = ImageTagRegistry.getBrokenLinkImage
(this, errCode, errParam);
} catch (Throwable t) {
filt = ImageTagRegistry.getBrokenLinkImage
(this, errCode, errParam);
}
dr.setSource(filt);
}
};
t.start();
return dr;
}
}