Class JPEGLosslessDecoderWrapper

java.lang.Object

com.twelvemonkeys.imageio.plugins.jpeg.JPEGLosslessDecoderWrapper

final class JPEGLosslessDecoderWrapper
extends Object

This class provides the conversion of input data containing a JPEG Lossless to an BufferedImage.

Take care, that only the following lossless formats are supported: 1.2.840.10008.1.2.4.57 JPEG Lossless, Nonhierarchical (Processes 14) 1.2.840.10008.1.2.4.70 JPEG Lossless, Nonhierarchical (Processes 14 [Selection 1])

Currently the following conversions are supported - 24Bit, RGB -> BufferedImage.TYPE_INT_RGB - 8Bit, Grayscale -> BufferedImage.TYPE_BYTE_GRAY - 16Bit, Grayscale -> BufferedImage.TYPE_USHORT_GRAY

Field Summary

Fields

Modifier and Type	Field	Description
private final JPEGImageReader	listenerDelegate

Constructor Summary

Constructors

Constructor	Description
JPEGLosslessDecoderWrapper(JPEGImageReader listenerDelegate)

Method Summary

Modifier and Type	Method	Description
(package private) BufferedImage	readImage(List<Segment> segments, ImageInputStream input)	Decodes a JPEG Lossless stream to a BufferedImage.
(package private) Raster	readRaster(List<Segment> segments, ImageInputStream input)
private BufferedImage	to16Bit1ComponentGrayScale(int[][] decoded, int precision, int width, int height)	Converts the decoded buffer into a BufferedImage.
private BufferedImage	to24Bit3ComponentRGB(int[][] decoded, int width, int height)	Converts the decoded buffer into a BufferedImage.
private BufferedImage	to8Bit1ComponentGrayScale(int[][] decoded, int width, int height)	Converts the decoded buffer into a BufferedImage.

Methods inherited from class Object

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

Field Details

listenerDelegate

private final JPEGImageReader listenerDelegate

Constructor Details

JPEGLosslessDecoderWrapper

JPEGLosslessDecoderWrapper(JPEGImageReader listenerDelegate)

Method Details

readImage

BufferedImage readImage(List<Segment> segments,
 ImageInputStream input)
                 throws IOException

Decodes a JPEG Lossless stream to a BufferedImage. Currently the following conversions are supported: - 24Bit, RGB -> BufferedImage.TYPE_3BYTE_BGR - 8Bit, Grayscale -> BufferedImage.TYPE_BYTE_GRAY - 16Bit, Grayscale -> BufferedImage.TYPE_USHORT_GRAY

Parameters:

segments - segments

input - input stream which contains JPEG Lossless data

Returns:

if successfully a BufferedImage is returned

Throws:

IOException - is thrown if the decoder failed or a conversion is not supported

readRaster

Raster readRaster(List<Segment> segments,
 ImageInputStream input)
           throws IOException

Throws:

IOException

to16Bit1ComponentGrayScale

private BufferedImage to16Bit1ComponentGrayScale(int[][] decoded,
 int precision,
 int width,
 int height)

Converts the decoded buffer into a BufferedImage. precision: 16 bit, componentCount = 1

Parameters:

decoded - data buffer

precision -

width - of the image

height - of the image @return a BufferedImage.TYPE_USHORT_GRAY

to8Bit1ComponentGrayScale

private BufferedImage to8Bit1ComponentGrayScale(int[][] decoded,
 int width,
 int height)

Converts the decoded buffer into a BufferedImage. precision: 8 bit, componentCount = 1

Parameters:

decoded - data buffer

width - of the image

height - of the image

Returns:

a BufferedImage.TYPE_BYTE_GRAY

to24Bit3ComponentRGB

private BufferedImage to24Bit3ComponentRGB(int[][] decoded,
 int width,
 int height)

Converts the decoded buffer into a BufferedImage. precision: 8 bit, componentCount = 3

Parameters:

decoded - data buffer

width - of the image

height - of the image

Returns:

a BufferedImage.TYPE_3BYTE_RGB