Package org.loboevolution.pdfview

Class PDFImage

java.lang.Object

org.loboevolution.pdfview.PDFImage

public class PDFImage
extends Object

Encapsulates a PDF Image

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	PDFImage(PDFObject imageObj)	Create an instance of a PDFImage

Method Summary

Modifier and Type	Method	Description
static PDFImage	createImage(PDFObject obj, Map<String,PDFObject> resources, boolean useAsSMask)	Read a PDFImage from an image dictionary and stream
BufferedImage	getImage()	Get the image that this PDFImage generates.
protected BufferedImage	parseData(byte[] data, ByteBuffer jpegData)	Parse the image stream into a buffered image.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

PDFImage

protected PDFImage(PDFObject imageObj)
            throws IOException

Create an instance of a PDFImage

Parameters:

imageObj - a PDFObject object.

Throws:

IOException - if any.

Method Details

createImage

public static PDFImage createImage(PDFObject obj,
 Map<String,PDFObject> resources,
 boolean useAsSMask)
                            throws IOException

Read a PDFImage from an image dictionary and stream

Parameters:

obj - the PDFObject containing the image's dictionary and stream

resources - the current resources

useAsSMask - - flag for switching colors in case image is used as sMask internally this is needed for handling transparency in smask images.

Returns:

a PDFImage object.

Throws:

IOException - if any.

getImage

public BufferedImage getImage()
                       throws PDFImageParseException

Get the image that this PDFImage generates.

Returns:

a buffered image containing the decoded image data

Throws:

PDFImageParseException - if any.

parseData

protected BufferedImage parseData(byte[] data,
 ByteBuffer jpegData)
                           throws IOException

Parse the image stream into a buffered image. Note that this is guaranteed to be called after all the other setXXX methods have been called.

NOTE: the color convolving is extremely slow on large images. It would be good to see if it could be moved out into the rendering phases, where we might be able to scale the image down first.

Parameters:

data - the data when already completely filtered and uncompressed

jpegData - a byte buffer if data still requiring the DCDTecode filter is being used

Returns:

a BufferedImage object.

Throws:

IOException - if any.