org.apache.pdfbox.jbig2.image

Class Bitmaps

java.lang.Object

org.apache.pdfbox.jbig2.image.Bitmaps

public class Bitmaps
extends Object

Constructor Summary

Constructors

Constructor and Description
Bitmaps()

Method Summary

Modifier and Type	Method and Description
static BufferedImage	asBufferedImage(Bitmap bitmap) Returns the given bitmap as buffered image.
static BufferedImage	asBufferedImage(Bitmap bitmap, FilterType filterType) Returns the given bitmap as buffered image.
static BufferedImage	asBufferedImage(Bitmap bitmap, ImageReadParam param, FilterType filterType) Returns the given bitmap as buffered image.
static WritableRaster	asRaster(Bitmap bitmap) Returns the given bitmap as writable raster.
static WritableRaster	asRaster(Bitmap bitmap, FilterType filterType) Returns the given bitmap as writable raster.
static WritableRaster	asRaster(Bitmap bitmap, ImageReadParam param, FilterType filterType) Returns the given bitmap as writable raster.
static void	blit(Bitmap src, Bitmap dst, int x, int y, CombinationOperator combinationOperator) This method combines a given bitmap with the current instance.
static byte	combineBytes(byte value1, byte value2, CombinationOperator op) The method combines two given bytes with an logical operator.
static Bitmap	extract(Rectangle roi, Bitmap src) Returns the specified rectangle area of the bitmap.
static Bitmap	subsample(Bitmap src, ImageReadParam param)
static Bitmap	subsampleX(Bitmap src, int xSubsampling, int xSubsamplingOffset)
static Bitmap	subsampleY(Bitmap src, int ySubsampling, int ySubsamplingOffset)

Methods inherited from class java.lang.Object

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

Constructor Detail

Bitmaps

public Bitmaps()

Method Detail

asRaster

public static WritableRaster asRaster(Bitmap bitmap)

Returns the given bitmap as writable raster.

Parameters:

bitmap - the given bitmap

Returns:

the raster representation of the bitmap

asRaster

public static WritableRaster asRaster(Bitmap bitmap,
                                      FilterType filterType)

Returns the given bitmap as writable raster.

Parameters:

bitmap - the given bitmap

filterType - type of filter which is used when creating the writable raster

Returns:

the raster representation of the bitmap

asRaster

public static WritableRaster asRaster(Bitmap bitmap,
                                      ImageReadParam param,
                                      FilterType filterType)

Returns the given bitmap as writable raster.

Parameters:

bitmap - the given bitmap

param - ImageReadParam to be used when creating the writable raster

filterType - type of filter which is used when creating the writable raster

Returns:

the raster representation of the bitmap

asBufferedImage

public static BufferedImage asBufferedImage(Bitmap bitmap)

Returns the given bitmap as buffered image.

Parameters:

bitmap - the given bitmap

Returns:

the image representation of the bitmap

asBufferedImage

public static BufferedImage asBufferedImage(Bitmap bitmap,
                                            FilterType filterType)

Returns the given bitmap as buffered image.

Parameters:

bitmap - the given bitmap

filterType - type of filter which is used when creating the buffered image

Returns:

the image representation of the bitmap

asBufferedImage

public static BufferedImage asBufferedImage(Bitmap bitmap,
                                            ImageReadParam param,
                                            FilterType filterType)

Returns the given bitmap as buffered image.

Parameters:

bitmap - the given bitmap

param - ImageReadParam to be used when creating the buffered image

filterType - type of filter which is used when creating the buffered image

Returns:

the image representation of the bitmap

extract

public static Bitmap extract(Rectangle roi,
                             Bitmap src)

Returns the specified rectangle area of the bitmap.

Parameters:

roi - - A Rectangle that specifies the requested image section.

src - the given bitmap

Returns:

A Bitmap that represents the requested image section.

subsample

public static Bitmap subsample(Bitmap src,
                               ImageReadParam param)

subsampleX

public static Bitmap subsampleX(Bitmap src,
                                int xSubsampling,
                                int xSubsamplingOffset)

subsampleY

public static Bitmap subsampleY(Bitmap src,
                                int ySubsampling,
                                int ySubsamplingOffset)

combineBytes

public static byte combineBytes(byte value1,
                                byte value2,
                                CombinationOperator op)

The method combines two given bytes with an logical operator.

The JBIG2 Standard specifies 5 possible combinations of bytes.

Hint: Please take a look at ISO/IEC 14492:2001 (E) for detailed definition and description of the operators.

Parameters:

value1 - - The value that should be combined with value2.

value2 - - The value that should be combined with value1.

op - - The specified combination operator.

Returns:

The combination result.

blit

public static void blit(Bitmap src,
                        Bitmap dst,
                        int x,
                        int y,
                        CombinationOperator combinationOperator)

This method combines a given bitmap with the current instance.

Parts of the bitmap to blit that are outside of the target bitmap will be ignored.

Parameters:

src - - The bitmap that should be combined with the one of the current instance.

dst - - The destination bitmap.

x - - The x coordinate where the upper left corner of the bitmap to blit should be positioned.

y - - The y coordinate where the upper left corner of the bitmap to blit should be positioned.

combinationOperator - - The combination operator for combining two pixels.