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package org.pdfbox.pdmodel.graphics.xobject;
import java.awt.image.BufferedImage;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import org.pdfbox.cos.COSBase;
import org.pdfbox.cos.COSName;
import org.pdfbox.pdmodel.PDDocument;
import org.pdfbox.pdmodel.common.PDStream;
import org.pdfbox.pdmodel.graphics.color.PDColorSpace;
import org.pdfbox.pdmodel.graphics.color.PDColorSpaceFactory;
import org.pdfbox.pdmodel.graphics.color.PDDeviceGray;
/**
* The prototype for all PDImages.
*
* @author <a href="mailto:ben@benlitchfield.com">Ben Litchfield</a>
* @author mathiak
* @version $Revision: 1.9 $
*/
public abstract class PDXObjectImage extends PDXObject
{
/**
* The XObject subtype.
*/
public static final String SUB_TYPE = "Image";
/**
* This contains the suffix used when writing to file.
*/
private String suffix;
/**
* Standard constuctor.
*
* @param imageStream The XObject is passed as a COSStream.
* @param fileSuffix The file suffix, jpg/png.
*/
public PDXObjectImage(PDStream imageStream, String fileSuffix)
{
super( imageStream );
suffix = fileSuffix;
}
/**
* Standard constuctor.
*
* @param doc The document to store the stream in.
* @param fileSuffix The file suffix, jpg/png.
*/
public PDXObjectImage(PDDocument doc, String fileSuffix)
{
super( doc );
getCOSStream().setName( COSName.SUBTYPE, SUB_TYPE );
suffix = fileSuffix;
}
/**
* Returns an java.awt.Image, that can be used for display etc.
*
* @return This PDF object as an AWT image.
*
* @throws IOException If there is an error creating the image.
*/
public abstract BufferedImage getRGBImage() throws IOException;
/**
* Writes the Image to out.
* @param out the OutputStream that the Image is written to.
* @throws IOException when somethings wrong with out
*/
public abstract void write2OutputStream(OutputStream out) throws IOException;
/**
* Writes the image to a file with the filename + an appropriate suffix, like "Image.jpg".
* The suffix is automatically set by the
* @param filename the filename
* @throws IOException When somethings wrong with the corresponding file.
*/
public void write2file(String filename) throws IOException
{
FileOutputStream out = null;
try
{
out = new FileOutputStream(filename + "." + suffix);
write2OutputStream(out);
out.flush();
}
finally
{
if( out != null )
{
out.close();
}
}
}
/**
* Get the height of the image.
*
* @return The height of the image.
*/
public int getHeight()
{
return getCOSStream().getInt( "Height", -1 );
}
/**
* Set the height of the image.
*
* @param height The height of the image.
*/
public void setHeight( int height )
{
getCOSStream().setInt( "Height", height );
}
/**
* Get the width of the image.
*
* @return The width of the image.
*/
public int getWidth()
{
return getCOSStream().getInt( "Width", -1 );
}
/**
* Set the width of the image.
*
* @param width The width of the image.
*/
public void setWidth( int width )
{
getCOSStream().setInt( "Width", width );
}
/**
* The bits per component of this image. This will return -1 if one has not
* been set.
*
* @return The number of bits per component.
*/
public int getBitsPerComponent()
{
return getCOSStream().getInt( new String[] { "BPC", "BitsPerComponent"}, -1 );
}
/**
* Set the number of bits per component.
*
* @param bpc The number of bits per component.
*/
public void setBitsPerComponent( int bpc )
{
getCOSStream().setInt( "BitsPerComponent", bpc );
}
/**
* This will get the color space or null if none exists.
*
* @return The color space for this image.
*
* @throws IOException If there is an error getting the colorspace.
*/
public PDColorSpace getColorSpace() throws IOException
{
COSBase cs = getCOSStream().getDictionaryObject( new String[]{ "CS", "ColorSpace" } );
PDColorSpace retval = null;
if( cs != null )
{
retval = PDColorSpaceFactory.createColorSpace( cs );
}
else
{
//there are some cases where the 'required' CS value is not present
//but we know that it will be grayscale for a CCITT filter.
COSBase filter = getCOSStream().getDictionaryObject( "Filter" );
if( COSName.CCITTFAX_DECODE.equals( filter ) ||
COSName.CCITTFAX_DECODE_ABBREVIATION.equals( filter ) )
{
retval = new PDDeviceGray();
}
}
return retval;
}
/**
* This will set the color space for this image.
*
* @param cs The color space for this image.
*/
public void setColorSpace( PDColorSpace cs )
{
COSBase base = null;
if( cs != null )
{
base = cs.getCOSObject();
}
getCOSStream().setItem( COSName.getPDFName( "ColorSpace" ), base );
}
/**
* This will get the suffix for this image type, jpg/png.
*
* @return The image suffix.
*/
public String getSuffix()
{
return suffix;
}
}