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package org.pdfbox.pdmodel.graphics.xobject;
import java.awt.image.BufferedImage;
import java.io.InputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;
import javax.imageio.ImageIO;
import org.pdfbox.cos.COSDictionary;
import org.pdfbox.cos.COSName;
import org.pdfbox.pdmodel.PDDocument;
import org.pdfbox.pdmodel.common.PDStream;
import org.pdfbox.pdmodel.graphics.color.PDDeviceRGB;
/**
* An image class for JPegs.
*
* @author mathiak
* @version $Revision: 1.5 $
*/
public class PDJpeg extends PDXObjectImage
{
private static final List DCT_FILTERS = new ArrayList();
static
{
DCT_FILTERS.add( COSName.DCT_DECODE.getName() );
DCT_FILTERS.add( COSName.DCT_DECODE_ABBREVIATION.getName() );
}
/**
* Standard constructor.
*
* @param jpeg The COSStream from which to extract the JPeg
*/
public PDJpeg(PDStream jpeg)
{
super(jpeg, "jpg");
}
/**
* Construct from a stream.
*
* @param doc The document to create the image as part of.
* @param is The stream that contains the jpeg data.
* @throws IOException If there is an error reading the jpeg data.
*/
public PDJpeg( PDDocument doc, InputStream is ) throws IOException
{
super( new PDStream( doc, is, true ), "jpg" );
COSDictionary dic = getCOSStream();
dic.setItem( COSName.FILTER, COSName.DCT_DECODE );
dic.setItem( COSName.SUBTYPE, COSName.IMAGE);
dic.setItem( COSName.TYPE, COSName.getPDFName( "XObject" ) );
BufferedImage image = getRGBImage();
setBitsPerComponent( 8 );
setColorSpace( PDDeviceRGB.INSTANCE );
setHeight( image.getHeight() );
setWidth( image.getWidth() );
}
/**
* Construct from a buffered image.
*
* @param doc The document to create the image as part of.
* @param bi The image to convert to a jpeg
* @throws IOException If there is an error processing the jpeg data.
*/
public PDJpeg( PDDocument doc, BufferedImage bi ) throws IOException
{
super( new PDStream( doc ), "jpg" );
java.io.OutputStream os = getCOSStream().createFilteredStream();
try
{
ImageIO.write(bi,"jpeg",os);
COSDictionary dic = getCOSStream();
dic.setItem( COSName.FILTER, COSName.DCT_DECODE );
dic.setItem( COSName.SUBTYPE, COSName.IMAGE);
dic.setItem( COSName.TYPE, COSName.getPDFName( "XObject" ) );
setBitsPerComponent( 8 );
setColorSpace( PDDeviceRGB.INSTANCE );
setHeight( bi.getHeight() );
setWidth( bi.getWidth() );
}
finally
{
os.close();
}
}
/**
* Returns an image of the JPeg, or null if JPegs are not supported. (They should be. )
* {@inheritDoc}
*/
public BufferedImage getRGBImage() throws IOException
{
return ImageIO.read(getPDStream().getPartiallyFilteredStream( DCT_FILTERS ));
}
/**
* This writes the JPeg to out.
* {@inheritDoc}
*/
public void write2OutputStream(OutputStream out) throws IOException
{
InputStream data = getPDStream().getPartiallyFilteredStream( DCT_FILTERS );
byte[] buf = new byte[1024];
int amountRead = -1;
while( (amountRead = data.read( buf )) != -1 )
{
out.write( buf, 0, amountRead );
}
}
}