javax.imageio

Class ImageTypeSpecifier

java.lang.Object

javax.imageio.ImageTypeSpecifier

public class ImageTypeSpecifier
extends Object

A class that allows the format of an image (in particular, its SampleModel and ColorModel) to be specified in a convenient manner.

Field Summary

Fields

Modifier and Type	Field and Description
protected ColorModel	colorModel The ColorModel to be used as a prototype.
protected SampleModel	sampleModel A SampleModel to be used as a prototype.

Constructor Summary

Constructors

Constructor and Description
ImageTypeSpecifier(ColorModel colorModel, SampleModel sampleModel) Constructs an ImageTypeSpecifier directly from a ColorModel and a SampleModel.
ImageTypeSpecifier(RenderedImage image) Constructs an ImageTypeSpecifier from a RenderedImage.

Method Summary

Modifier and Type	Method and Description
static ImageTypeSpecifier	createBanded(ColorSpace colorSpace, int[] bankIndices, int[] bandOffsets, int dataType, boolean hasAlpha, boolean isAlphaPremultiplied) Returns a specifier for a banded image format that will use a ComponentColorModel and a BandedSampleModel to store each channel in a separate array.
BufferedImage	createBufferedImage(int width, int height) Creates a BufferedImage with a given width and height according to the specification embodied in this object.
static ImageTypeSpecifier	createFromBufferedImageType(int bufferedImageType) Returns an ImageTypeSpecifier that encodes one of the standard BufferedImage types (other than TYPE_CUSTOM).
static ImageTypeSpecifier	createFromRenderedImage(RenderedImage image) Returns an ImageTypeSpecifier that encodes the layout of a RenderedImage (which may be a BufferedImage).
static ImageTypeSpecifier	createGrayscale(int bits, int dataType, boolean isSigned) Returns a specifier for a grayscale image format that will pack pixels of the given bit depth into array elements of the specified data type.
static ImageTypeSpecifier	createGrayscale(int bits, int dataType, boolean isSigned, boolean isAlphaPremultiplied) Returns a specifier for a grayscale plus alpha image format that will pack pixels of the given bit depth into array elements of the specified data type.
static ImageTypeSpecifier	createIndexed(byte[] redLUT, byte[] greenLUT, byte[] blueLUT, byte[] alphaLUT, int bits, int dataType) Returns a specifier for an indexed-color image format that will pack index values of the given bit depth into array elements of the specified data type.
static ImageTypeSpecifier	createInterleaved(ColorSpace colorSpace, int[] bandOffsets, int dataType, boolean hasAlpha, boolean isAlphaPremultiplied) Returns a specifier for an interleaved image format that will use a ComponentColorModel and a PixelInterleavedSampleModel to store each pixel component in a separate byte, short, or int.
static ImageTypeSpecifier	createPacked(ColorSpace colorSpace, int redMask, int greenMask, int blueMask, int alphaMask, int transferType, boolean isAlphaPremultiplied) Returns a specifier for a packed image format that will use a DirectColorModel and a packed SampleModel to store each pixel packed into in a single byte, short, or int.
boolean	equals(Object o) Returns true if the given Object is an ImageTypeSpecifier and has a SampleModel and ColorModel that are equal to those of this object.
int	getBitsPerBand(int band) Return the number of bits used to represent samples of the given band.
int	getBufferedImageType() Returns an int containing one of the enumerated constant values describing image formats from BufferedImage.
ColorModel	getColorModel() Returns the ColorModel specified by this object.
int	getNumBands() Return the number of bands specified by this object.
int	getNumComponents() Return the number of color components specified by this object.
SampleModel	getSampleModel() Returns a SampleModel based on the settings encapsulated within this object.
SampleModel	getSampleModel(int width, int height) Returns a SampleModel based on the settings encapsulated within this object.
int	hashCode() Returns the hash code for this ImageTypeSpecifier.

Methods inherited from class java.lang.Object

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

Field Detail

colorModel

protected ColorModel colorModel

The ColorModel to be used as a prototype.

sampleModel

protected SampleModel sampleModel

A SampleModel to be used as a prototype.

Constructor Detail

ImageTypeSpecifier

public ImageTypeSpecifier(ColorModel colorModel,
                          SampleModel sampleModel)

Constructs an ImageTypeSpecifier directly from a ColorModel and a SampleModel. It is the caller's responsibility to supply compatible parameters.

Parameters:

colorModel - a ColorModel.

sampleModel - a SampleModel.

Throws:

IllegalArgumentException - if either parameter is null.

IllegalArgumentException - if sampleModel is not compatible with colorModel.

ImageTypeSpecifier

public ImageTypeSpecifier(RenderedImage image)

Constructs an ImageTypeSpecifier from a RenderedImage. If a BufferedImage is being used, one of the factory methods createFromRenderedImage or createFromBufferedImageType should be used instead in order to get a more accurate result.

Parameters:

image - a RenderedImage.

Throws:

IllegalArgumentException - if the argument is null.

Method Detail

createPacked

public static ImageTypeSpecifier createPacked(ColorSpace colorSpace,
                                              int redMask,
                                              int greenMask,
                                              int blueMask,
                                              int alphaMask,
                                              int transferType,
                                              boolean isAlphaPremultiplied)

Returns a specifier for a packed image format that will use a DirectColorModel and a packed SampleModel to store each pixel packed into in a single byte, short, or int.

Parameters:

colorSpace - the desired ColorSpace.

redMask - a contiguous mask indicated the position of the red channel.

greenMask - a contiguous mask indicated the position of the green channel.

blueMask - a contiguous mask indicated the position of the blue channel.

alphaMask - a contiguous mask indicated the position of the alpha channel.

transferType - the desired SampleModel transfer type.

isAlphaPremultiplied - true if the color channels will be premultipled by the alpha channel.

Returns:

an ImageTypeSpecifier with the desired characteristics.

Throws:

IllegalArgumentException - if colorSpace is null.

IllegalArgumentException - if colorSpace is not of type TYPE_RGB.

IllegalArgumentException - if no mask has at least 1 bit set.

IllegalArgumentException - if transferType if not one of DataBuffer.TYPE_BYTE, DataBuffer.TYPE_USHORT, or DataBuffer.TYPE_INT.

createInterleaved

public static ImageTypeSpecifier createInterleaved(ColorSpace colorSpace,
                                                   int[] bandOffsets,
                                                   int dataType,
                                                   boolean hasAlpha,
                                                   boolean isAlphaPremultiplied)

Returns a specifier for an interleaved image format that will use a ComponentColorModel and a PixelInterleavedSampleModel to store each pixel component in a separate byte, short, or int.

Parameters:

colorSpace - the desired ColorSpace.

bandOffsets - an array of ints indicating the offsets for each band.

dataType - the desired data type, as one of the enumerations from the DataBuffer class.

hasAlpha - true if an alpha channel is desired.

isAlphaPremultiplied - true if the color channels will be premultipled by the alpha channel.

Returns:

an ImageTypeSpecifier with the desired characteristics.

Throws:

IllegalArgumentException - if colorSpace is null.

IllegalArgumentException - if bandOffsets is null.

IllegalArgumentException - if dataType is not one of the legal DataBuffer.TYPE_* constants.

IllegalArgumentException - if bandOffsets.length does not equal the number of color space components, plus 1 if hasAlpha is true.

createBanded

public static ImageTypeSpecifier createBanded(ColorSpace colorSpace,
                                              int[] bankIndices,
                                              int[] bandOffsets,
                                              int dataType,
                                              boolean hasAlpha,
                                              boolean isAlphaPremultiplied)

Returns a specifier for a banded image format that will use a ComponentColorModel and a BandedSampleModel to store each channel in a separate array.

Parameters:

colorSpace - the desired ColorSpace.

bankIndices - an array of ints indicating the bank in which each band will be stored.

bandOffsets - an array of ints indicating the starting offset of each band within its bank.

dataType - the desired data type, as one of the enumerations from the DataBuffer class.

hasAlpha - true if an alpha channel is desired.

isAlphaPremultiplied - true if the color channels will be premultipled by the alpha channel.

Returns:

an ImageTypeSpecifier with the desired characteristics.

Throws:

IllegalArgumentException - if colorSpace is null.

IllegalArgumentException - if bankIndices is null.

IllegalArgumentException - if bandOffsets is null.

IllegalArgumentException - if the lengths of bankIndices and bandOffsets differ.

IllegalArgumentException - if bandOffsets.length does not equal the number of color space components, plus 1 if hasAlpha is true.

IllegalArgumentException - if dataType is not one of the legal DataBuffer.TYPE_* constants.

createGrayscale

public static ImageTypeSpecifier createGrayscale(int bits,
                                                 int dataType,
                                                 boolean isSigned)

Returns a specifier for a grayscale image format that will pack pixels of the given bit depth into array elements of the specified data type.

Parameters:

bits - the number of bits per gray value (1, 2, 4, 8, or 16).

dataType - the desired data type, as one of the enumerations from the DataBuffer class.

isSigned - true if negative values are to be represented.

Returns:

an ImageTypeSpecifier with the desired characteristics.

Throws:

IllegalArgumentException - if bits is not one of 1, 2, 4, 8, or 16.

IllegalArgumentException - if dataType is not one of DataBuffer.TYPE_BYTE, DataBuffer.TYPE_SHORT, or DataBuffer.TYPE_USHORT.

IllegalArgumentException - if bits is larger than the bit size of the given dataType.

createGrayscale

public static ImageTypeSpecifier createGrayscale(int bits,
                                                 int dataType,
                                                 boolean isSigned,
                                                 boolean isAlphaPremultiplied)

Returns a specifier for a grayscale plus alpha image format that will pack pixels of the given bit depth into array elements of the specified data type.

Parameters:

bits - the number of bits per gray value (1, 2, 4, 8, or 16).

dataType - the desired data type, as one of the enumerations from the DataBuffer class.

isSigned - true if negative values are to be represented.

isAlphaPremultiplied - true if the luminance channel will be premultipled by the alpha channel.

Returns:

an ImageTypeSpecifier with the desired characteristics.

Throws:

IllegalArgumentException - if bits is not one of 1, 2, 4, 8, or 16.

IllegalArgumentException - if dataType is not one of DataBuffer.TYPE_BYTE, DataBuffer.TYPE_SHORT, or DataBuffer.TYPE_USHORT.

IllegalArgumentException - if bits is larger than the bit size of the given dataType.

createIndexed

public static ImageTypeSpecifier createIndexed(byte[] redLUT,
                                               byte[] greenLUT,
                                               byte[] blueLUT,
                                               byte[] alphaLUT,
                                               int bits,
                                               int dataType)

Returns a specifier for an indexed-color image format that will pack index values of the given bit depth into array elements of the specified data type.

Parameters:

redLUT - an array of bytes containing the red values for each index.

greenLUT - an array of bytes containing * the green values for each index.

blueLUT - an array of bytes containing the blue values for each index.

alphaLUT - an array of bytes containing the alpha values for each index, or null to create a fully opaque LUT.

bits - the number of bits in each index.

dataType - the desired output type, as one of the enumerations from the DataBuffer class.

Returns:

an ImageTypeSpecifier with the desired characteristics.

Throws:

IllegalArgumentException - if redLUT is null.

IllegalArgumentException - if greenLUT is null.

IllegalArgumentException - if blueLUT is null.

IllegalArgumentException - if bits is not one of 1, 2, 4, 8, or 16.

IllegalArgumentException - if the non-null LUT parameters do not have lengths of exactly 1 << bits.

IllegalArgumentException - if dataType is not one of DataBuffer.TYPE_BYTE, DataBuffer.TYPE_SHORT, DataBuffer.TYPE_USHORT, or DataBuffer.TYPE_INT.

IllegalArgumentException - if bits is larger than the bit size of the given dataType.

createFromBufferedImageType

public static ImageTypeSpecifier createFromBufferedImageType(int bufferedImageType)

Returns an ImageTypeSpecifier that encodes one of the standard BufferedImage types (other than TYPE_CUSTOM).

Parameters:

bufferedImageType - an int representing one of the standard BufferedImage types.

Returns:

an ImageTypeSpecifier with the desired characteristics.

Throws:

IllegalArgumentException - if bufferedImageType is not one of the standard types, or is equal to TYPE_CUSTOM.

See Also:

BufferedImage, BufferedImage.TYPE_INT_RGB, BufferedImage.TYPE_INT_ARGB, BufferedImage.TYPE_INT_ARGB_PRE, BufferedImage.TYPE_INT_BGR, BufferedImage.TYPE_3BYTE_BGR, BufferedImage.TYPE_4BYTE_ABGR, BufferedImage.TYPE_4BYTE_ABGR_PRE, BufferedImage.TYPE_USHORT_565_RGB, BufferedImage.TYPE_USHORT_555_RGB, BufferedImage.TYPE_BYTE_GRAY, BufferedImage.TYPE_USHORT_GRAY, BufferedImage.TYPE_BYTE_BINARY, BufferedImage.TYPE_BYTE_INDEXED

createFromRenderedImage

public static ImageTypeSpecifier createFromRenderedImage(RenderedImage image)

Returns an ImageTypeSpecifier that encodes the layout of a RenderedImage (which may be a BufferedImage).

Parameters:

image - a RenderedImage.

Returns:

an ImageTypeSpecifier with the desired characteristics.

Throws:

IllegalArgumentException - if image is null.

getBufferedImageType

public int getBufferedImageType()

Returns an int containing one of the enumerated constant values describing image formats from BufferedImage.

Returns:

an int representing a BufferedImage type.

See Also:

BufferedImage, BufferedImage.TYPE_CUSTOM, BufferedImage.TYPE_INT_RGB, BufferedImage.TYPE_INT_ARGB, BufferedImage.TYPE_INT_ARGB_PRE, BufferedImage.TYPE_INT_BGR, BufferedImage.TYPE_3BYTE_BGR, BufferedImage.TYPE_4BYTE_ABGR, BufferedImage.TYPE_4BYTE_ABGR_PRE, BufferedImage.TYPE_USHORT_565_RGB, BufferedImage.TYPE_USHORT_555_RGB, BufferedImage.TYPE_BYTE_GRAY, BufferedImage.TYPE_USHORT_GRAY, BufferedImage.TYPE_BYTE_BINARY, BufferedImage.TYPE_BYTE_INDEXED

getNumComponents

public int getNumComponents()

Return the number of color components specified by this object. This is the same value as returned by ColorModel.getNumComponents

Returns:

the number of components in the image.

getNumBands

public int getNumBands()

Return the number of bands specified by this object. This is the same value as returned by SampleModel.getNumBands

Returns:

the number of bands in the image.

getBitsPerBand

public int getBitsPerBand(int band)

Return the number of bits used to represent samples of the given band.

Parameters:

band - the index of the band to be queried, as an int.

Returns:

an int specifying a number of bits.

Throws:

IllegalArgumentException - if band is negative or greater than the largest band index.

getSampleModel

public SampleModel getSampleModel()

Returns a SampleModel based on the settings encapsulated within this object. The width and height of the SampleModel will be set to arbitrary values.

Returns:

a SampleModel with arbitrary dimensions.

getSampleModel

public SampleModel getSampleModel(int width,
                                  int height)

Returns a SampleModel based on the settings encapsulated within this object. The width and height of the SampleModel will be set to the supplied values.

Parameters:

width - the desired width of the returned SampleModel.

height - the desired height of the returned SampleModel.

Returns:

a SampleModel with the given dimensions.

Throws:

IllegalArgumentException - if either width or height are negative or zero.

IllegalArgumentException - if the product of width and height is greater than Integer.MAX_VALUE

getColorModel

public ColorModel getColorModel()

Returns the ColorModel specified by this object.

Returns:

a ColorModel.

createBufferedImage

public BufferedImage createBufferedImage(int width,
                                         int height)

Creates a BufferedImage with a given width and height according to the specification embodied in this object.

Parameters:

width - the desired width of the returned BufferedImage.

height - the desired height of the returned BufferedImage.

Returns:

a new BufferedImage

Throws:

IllegalArgumentException - if either width or height are negative or zero.

IllegalArgumentException - if the product of width and height is greater than Integer.MAX_VALUE, or if the number of array elements needed to store the image is greater than Integer.MAX_VALUE.

equals

public boolean equals(Object o)

Returns true if the given Object is an ImageTypeSpecifier and has a SampleModel and ColorModel that are equal to those of this object.

Overrides:

equals in class Object

Parameters:

o - the Object to be compared for equality.

Returns:

true if the given object is an equivalent ImageTypeSpecifier.

See Also:

Object.hashCode(), HashMap

hashCode

public int hashCode()

Returns the hash code for this ImageTypeSpecifier.

Overrides:

hashCode in class Object

Returns:

a hash code for this ImageTypeSpecifier

See Also:

Object.equals(java.lang.Object), System.identityHashCode(java.lang.Object)