/*
* $Id: JpegImage.java,v 1.1 2001/09/18 08:17:07 keiron Exp $
* Copyright (C) 2001 The Apache Software Foundation. All rights reserved.
* For details on use and redistribution please refer to the
* LICENSE file included with these sources.
*/
package org.apache.fop.image;
// Java
import java.net.URL;
import java.awt.image.ImageProducer;
import java.awt.image.ColorModel;
import java.awt.image.IndexColorModel;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
// FOP
import org.apache.fop.datatypes.ColorSpace;
import org.apache.fop.pdf.PDFColor;
import org.apache.fop.pdf.DCTFilter;
import org.apache.fop.image.analyser.ImageReader;
/**
* FopImage object for JPEG images, Using Java native classes.
* @author Eric Dalquist
* @see AbstractFopImage
* @see FopImage
*/
public class JpegImage extends AbstractFopImage {
public JpegImage(URL href) throws FopImageException {
super(href);
}
public JpegImage(URL href,
ImageReader imgReader) throws FopImageException {
super(href, imgReader);
}
protected void loadImage() throws FopImageException {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
InputStream inStream;
byte[] readBuf = new byte[4096];
int bytes_read;
int index = 0;
boolean cont = true;
this.m_compressionType = new DCTFilter();
this.m_compressionType.setApplied(true);
try {
inStream = this.m_href.openStream();
while ((bytes_read = inStream.read(readBuf)) != -1) {
baos.write(readBuf, 0, bytes_read);
}
} catch (java.io.IOException ex) {
throw new FopImageException("Error while loading image " +
this.m_href.toString() + " : " + ex.getClass() +
" - " + ex.getMessage());
}
this.m_bitmaps = baos.toByteArray();
this.m_bitsPerPixel = 8;
this.m_isTransparent = false;
if (this.m_bitmaps.length > (index + 2) &&
uByte(this.m_bitmaps[index]) == 255 &&
uByte(this.m_bitmaps[index + 1]) == 216) {
index += 2;
while (index < this.m_bitmaps.length && cont) {
//check to be sure this is the begining of a header
if (this.m_bitmaps.length > (index + 2) &&
uByte(this.m_bitmaps[index]) == 255) {
//192 or 194 are the header bytes that contain the jpeg width height and color depth.
if (uByte(this.m_bitmaps[index + 1]) == 192 ||
uByte(this.m_bitmaps[index + 1]) == 194) {
this.m_height = calcBytes(this.m_bitmaps[index + 5],
this.m_bitmaps[index + 6]);
this.m_width = calcBytes(this.m_bitmaps[index + 7],
this.m_bitmaps[index + 8]);
if (this.m_bitmaps[index + 9] == 1) {
this.m_colorSpace = new ColorSpace(
ColorSpace.DEVICE_GRAY);
} else if (this.m_bitmaps[index + 9] == 3) {
this.m_colorSpace =
new ColorSpace(ColorSpace.DEVICE_RGB);
} else {
cont = false;
throw new FopImageException(
"\n2 Error while loading image " +
this.m_href.toString() +
" : JpegImage - Invalid JPEG Header (bad color space " +
this.m_bitmaps[index + 9] + ").");
}
cont = false;
break;
} else { // if (uByte(this.m_bitmaps[index + 1]) == headers[headerIndex]) {
index += calcBytes(this.m_bitmaps[index + 2],
this.m_bitmaps[index + 3]) + 2;
}
} else {
cont = false;
throw new FopImageException(
"\n2 Error while loading image " +
this.m_href.toString() + " : JpegImage - Invalid JPEG Header (bad header byte).");
}
}
} else {
throw new FopImageException( "\n1 Error while loading image " +
this.m_href.toString() + " : JpegImage - Invalid JPEG Header.");
}
}
private int calcBytes(byte bOne, byte bTwo) {
return (uByte(bOne) * 256) + uByte(bTwo);
}
private int uByte(byte bIn) {
if (bIn < 0) {
return 256 + bIn;
} else {
return bIn;
}
}
}