java.awt.image

Class PixelInterleavedSampleModel

java.lang.Object

java.awt.image.SampleModel

java.awt.image.ComponentSampleModel

java.awt.image.PixelInterleavedSampleModel

public class PixelInterleavedSampleModel
extends ComponentSampleModel

This class represents image data which is stored in a pixel interleaved fashion and for which each sample of a pixel occupies one data element of the DataBuffer. It subclasses ComponentSampleModel but provides a more efficent implementation for accessing pixel interleaved image data than is provided by ComponentSampleModel. This class stores sample data for all bands in a single bank of the DataBuffer. Accessor methods are provided so that image data can be manipulated directly. Pixel stride is the number of data array elements between two samples for the same band on the same scanline. Scanline stride is the number of data array elements between a given sample and the corresponding sample in the same column of the next scanline. Band offsets denote the number of data array elements from the first data array element of the bank of the DataBuffer holding each band to the first sample of the band. The bands are numbered from 0 to N-1. Bank indices denote the correspondence between a bank of the data buffer and a band of image data. This class supports TYPE_BYTE, TYPE_USHORT, TYPE_SHORT, TYPE_INT, TYPE_FLOAT and TYPE_DOUBLE datatypes.

Field Summary

Fields inherited from class java.awt.image.ComponentSampleModel

bandOffsets, bankIndices, numBands, numBanks, pixelStride, scanlineStride

Fields inherited from class java.awt.image.SampleModel

dataType, height, width

Constructor Summary

Constructors

Constructor and Description
PixelInterleavedSampleModel(int dataType, int w, int h, int pixelStride, int scanlineStride, int[] bandOffsets) Constructs a PixelInterleavedSampleModel with the specified parameters.

Method Summary

Methods

Modifier and Type	Method and Description
SampleModel	createCompatibleSampleModel(int w, int h) Creates a new PixelInterleavedSampleModel with the specified width and height.
SampleModel	createSubsetSampleModel(int[] bands) Creates a new PixelInterleavedSampleModel with a subset of the bands of this PixelInterleavedSampleModel.
int	hashCode() Returns a hash code value for the object.

Methods inherited from class java.awt.image.ComponentSampleModel

createDataBuffer, equals, getBandOffsets, getBankIndices, getDataElements, getNumDataElements, getOffset, getOffset, getPixel, getPixels, getPixelStride, getSample, getSampleDouble, getSampleFloat, getSamples, getSampleSize, getSampleSize, getScanlineStride, setDataElements, setPixel, setPixels, setSample, setSample, setSample, setSamples

Methods inherited from class java.awt.image.SampleModel

getDataElements, getDataType, getHeight, getNumBands, getPixel, getPixel, getPixels, getPixels, getSamples, getSamples, getTransferType, getWidth, setDataElements, setPixel, setPixel, setPixels, setPixels, setSamples, setSamples

Methods inherited from class java.lang.Object

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

Constructor Detail

PixelInterleavedSampleModel

public PixelInterleavedSampleModel(int dataType,
                           int w,
                           int h,
                           int pixelStride,
                           int scanlineStride,
                           int[] bandOffsets)

Constructs a PixelInterleavedSampleModel with the specified parameters. The number of bands will be given by the length of the bandOffsets array.

Parameters:

dataType - The data type for storing samples.

w - The width (in pixels) of the region of image data described.

h - The height (in pixels) of the region of image data described.

pixelStride - The pixel stride of the image data.

scanlineStride - The line stride of the image data.

bandOffsets - The offsets of all bands.

Throws:

IllegalArgumentException - if w or h is not greater than 0

IllegalArgumentException - if any offset between bands is greater than the scanline stride

IllegalArgumentException - if the product of pixelStride and w is greater than scanlineStride

IllegalArgumentException - if pixelStride is less than any offset between bands

IllegalArgumentException - if dataType is not one of the supported data types

Method Detail

createCompatibleSampleModel

public SampleModel createCompatibleSampleModel(int w,
                                      int h)

Creates a new PixelInterleavedSampleModel with the specified width and height. The new PixelInterleavedSampleModel will have the same number of bands, storage data type, and pixel stride as this PixelInterleavedSampleModel. The band offsets may be compressed such that the minimum of all of the band offsets is zero.

Overrides:

createCompatibleSampleModel in class ComponentSampleModel

Parameters:

w - the width of the resulting SampleModel

h - the height of the resulting SampleModel

Returns:

a new SampleModel with the specified width and height.

Throws:

IllegalArgumentException - if w or h is not greater than 0

createSubsetSampleModel

public SampleModel createSubsetSampleModel(int[] bands)

Creates a new PixelInterleavedSampleModel with a subset of the bands of this PixelInterleavedSampleModel. The new PixelInterleavedSampleModel can be used with any DataBuffer that the existing PixelInterleavedSampleModel can be used with. The new PixelInterleavedSampleModel/DataBuffer combination will represent an image with a subset of the bands of the original PixelInterleavedSampleModel/DataBuffer combination.

Overrides:

createSubsetSampleModel in class ComponentSampleModel

Parameters:

bands - a subset of bands from this ComponentSampleModel

Returns:

a ComponentSampleModel created with a subset of bands from this ComponentSampleModel.

hashCode

public int hashCode()

Description copied from class: Object

Returns a hash code value for the object. This method is supported for the benefit of hashtables such as those provided by java.util.Hashtable.

The general contract of hashCode is:

• Whenever it is invoked on the same object more than once during an execution of a Java application, the hashCode method must consistently return the same integer, provided no information used in equals comparisons on the object is modified. This integer need not remain consistent from one execution of an application to another execution of the same application.
• If two objects are equal according to the equals(Object) method, then calling the hashCode method on each of the two objects must produce the same integer result.
• It is not required that if two objects are unequal according to the Object.equals(java.lang.Object) method, then calling the hashCode method on each of the two objects must produce distinct integer results. However, the programmer should be aware that producing distinct integer results for unequal objects may improve the performance of hashtables.

As much as is reasonably practical, the hashCode method defined by class Object does return distinct integers for distinct objects. (This is typically implemented by converting the internal address of the object into an integer, but this implementation technique is not required by the Java^TM programming language.)

Overrides:

hashCode in class ComponentSampleModel

Returns:

a hash code value for this object.

See Also:

Object.equals(java.lang.Object), Hashtable