java.awt.image
Class ComponentSampleModel

java.lang.Object
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  +--java.awt.image.SampleModel
        |
        +--java.awt.image.ComponentSampleModel

Direct Known Subclasses:

BandedSampleModel, PixelInterleavedSampleModel

public class ComponentSampleModel

extends SampleModel

This class represents image data which is stored such that each sample of a pixel occupies one data element of the DataBuffer. It stores the N samples which make up a pixel in N separate data array elements. Different bands may be in different banks of the DataBuffer. Accessor methods are provided so that image data can be manipulated directly. This class can support different kinds of interleaving, e.g. band interleaving, scanline interleaving, and pixel interleaving. 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. This class can represent image data for which each sample is an integral number which can be stored in 8, 16, or 32 bits (all samples of a given ComponentSampleModel are stored with the same precision). All strides and offsets must be non-negative.

See Also:

PixelInterleavedSampleModel, BandedSampleModel

Field Summary

protected int[]	bandOffsets Offsets for all bands in data array elements.
protected int[]	bankIndices Index for each bank storing a band of image data.
protected int	numBands
protected int	numBanks
protected int	pixelStride Pixel stride (in data array elements) of the region of image data described by this ComponentSampleModel.
protected int	scanlineStride Line stride (in data array elements) of the region of image data described by this ComponentSampleModel.

Fields inherited from class java.awt.image.SampleModel

dataType, height, numBands, width

Constructor Summary

ComponentSampleModel(int dataType, int w, int h, int pixelStride, int scanlineStride, int[] bandOffsets)
Constructs a ComponentSampleModel with the specified parameters.

ComponentSampleModel(int dataType, int w, int h, int pixelStride, int scanlineStride, int[] bankIndices, int[] bandOffsets)
Constructs a ComponentSampleModel with the specified parameters.

Method Summary

SampleModel	createCompatibleSampleModel(int w, int h) Creates a new ComponentSampleModel with the specified width and height.
DataBuffer	createDataBuffer() Creates a DataBuffer that corresponds to this ComponentSampleModel.
SampleModel	createSubsetSampleModel(int[] bands) This creates a new ComponentSampleModel with a subset of the bands of this ComponentSampleModel.
int[]	getBandOffsets() Returns the band offset for all bands.
int[]	getBankIndices() Returns the bank indices for all bands.
Object	getDataElements(int x, int y, Object obj, DataBuffer data) Returns data for a single pixel in a primitive array of type TransferType.
int	getNumDataElements() Returns the number of data elements needed to transfer a pixel via the getDataElements and setDataElements methods.
int	getOffset(int x, int y) Gets the offset for the first band of pixel (x,y).
int	getOffset(int x, int y, int b) Gets the offset for band b of pixel (x,y).
int[]	getPixel(int x, int y, int[] iArray, DataBuffer data) Returns all samples for the specified pixel in an int array, one sample per array element.
int[]	getPixels(int x, int y, int w, int h, int[] iArray, DataBuffer data) Returns all samples for the specified rectangle of pixels in an int array, one sample per array element.
int	getPixelStride() Returns the pixel stride of this ComponentSampleModel.
int	getSample(int x, int y, int b, DataBuffer data) Returns as int the sample in a specified band for the pixel located at (x,y).
int[]	getSamples(int x, int y, int w, int h, int b, int[] iArray, DataBuffer data) Returns the samples in a specified band for the specified rectangle of pixels in an int array, one sample per data array element.
int[]	getSampleSize() Returns the number of bits per sample for all bands.
int	getSampleSize(int band) Returns the number of bits per sample for the specified band.
int	getScanlineStride() Returns the scanline stride of this ComponentSampleModel.
void	setDataElements(int x, int y, Object obj, DataBuffer data) Sets the data for a single pixel in the specified DataBuffer from a primitive array of type TransferType.
void	setPixel(int x, int y, int[] iArray, DataBuffer data) Sets a pixel in the DataBuffer using an int array of samples for input.
void	setPixels(int x, int y, int w, int h, int[] iArray, DataBuffer data) Sets all samples for a rectangle of pixels from an int array containing one sample per array element.
void	setSample(int x, int y, int b, int s, DataBuffer data) Sets a sample in the specified band for the pixel located at (x,y) in the DataBuffer using an int for input.
void	setSamples(int x, int y, int w, int h, int b, int[] iArray, DataBuffer data) Sets the samples in the specified band for the specified rectangle of pixels from an int array containing one sample per data array element.

Methods inherited from class java.awt.image.SampleModel

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

Methods inherited from class java.lang.Object

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

Field Detail

bandOffsets

protected int[] bandOffsets

Offsets for all bands in data array elements.

bankIndices

protected int[] bankIndices

Index for each bank storing a band of image data.

numBands

protected int numBands

numBanks

protected int numBanks

scanlineStride

protected int scanlineStride

Line stride (in data array elements) of the region of image data described by this ComponentSampleModel.

pixelStride

protected int pixelStride

Pixel stride (in data array elements) of the region of image data described by this ComponentSampleModel.

Constructor Detail

ComponentSampleModel

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

Constructs a ComponentSampleModel with the specified parameters. The number of bands will be given by the length of the bandOffsets array. All bands will be stored in the first bank of the DataBuffer.

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 region of image data described.

scanlineStride - The line stride of the region of image data described.

bandOffsets - The offsets of all bands.

ComponentSampleModel

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

Constructs a ComponentSampleModel with the specified parameters. The number of bands will be given by the length of the bandOffsets array. Different bands may be stored in different banks of the DataBuffer.

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 region of image data described.

scanlineStride - The line stride of the region of image data described.

bandIndices - The bank indices of all bands.

bandOffsets - The band offsets of all bands.

Method Detail

createCompatibleSampleModel

public SampleModel createCompatibleSampleModel(int w,
                                               int h)

Creates a new ComponentSampleModel with the specified width and height. The new SampleModel will have the same number of bands, storage data type, interleaving scheme, and pixel stride as this SampleModel.

Overrides:

createCompatibleSampleModel in class SampleModel

createSubsetSampleModel

public SampleModel createSubsetSampleModel(int[] bands)

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

Overrides:

createSubsetSampleModel in class SampleModel

createDataBuffer

public DataBuffer createDataBuffer()

Creates a DataBuffer that corresponds to this ComponentSampleModel. The DataBuffer's data type, number of banks, and size will be consistent with this ComponentSampleModel.

Overrides:

createDataBuffer in class SampleModel

getOffset

public int getOffset(int x,
                     int y)

Gets the offset for the first band of pixel (x,y). A sample of the first band can be retrieved from a DataBuffer data with a ComponentSampleModel csm as

        data.getElem(csm.getOffset(x, y));
 

getOffset

public int getOffset(int x,
                     int y,
                     int b)

Gets the offset for band b of pixel (x,y). A sample of band b can be retrieved from a DataBuffer data with a ComponentSampleModel csm as

       data.getElem(csm.getOffset(x, y, b));
 

getSampleSize

public final int[] getSampleSize()

Returns the number of bits per sample for all bands.

Overrides:

getSampleSize in class SampleModel

getSampleSize

public final int getSampleSize(int band)

Returns the number of bits per sample for the specified band.

Overrides:

getSampleSize in class SampleModel

getBankIndices

public final int[] getBankIndices()

Returns the bank indices for all bands.

getBandOffsets

public final int[] getBandOffsets()

Returns the band offset for all bands.

getScanlineStride

public final int getScanlineStride()

Returns the scanline stride of this ComponentSampleModel.

getPixelStride

public final int getPixelStride()

Returns the pixel stride of this ComponentSampleModel.

getNumDataElements

public final int getNumDataElements()

Returns the number of data elements needed to transfer a pixel via the getDataElements and setDataElements methods. For a ComponentSampleModel this is identical to the number of bands.

Overrides:

getNumDataElements in class SampleModel

See Also:

SampleModel.getNumDataElements()

getDataElements

public Object getDataElements(int x,
                              int y,
                              Object obj,
                              DataBuffer data)

Returns data for a single pixel in a primitive array of type TransferType. For a ComponentSampleModel, this will be the same as the data type, and samples will be returned one per array element. Generally, obj should be passed in as null, so that the Object will be created automatically and will be of the right primitive data type.

The following code illustrates transferring data for one pixel from DataBuffer db1, whose storage layout is described by ComponentSampleModel csm1, to DataBuffer db2, whose storage layout is described by ComponentSampleModel csm2. The transfer will generally be more efficient than using getPixel/setPixel.

 	     ComponentSampleModel csm1, csm2;
	     DataBufferInt db1, db2;
 	     csm2.setDataElements(x, y,
                            csm1.getDataElements(x, y, null, db1), db2);
 

Using getDataElements/setDataElements to transfer between two DataBuffer/SampleModel pairs is legitimate if the SampleModels have the same number of bands, corresponding bands have the same number of bits per sample, and the TransferTypes are the same.

If obj is non-null, it should be a primitive array of type TransferType. Otherwise, a ClassCastException is thrown. An ArrayIndexOutOfBoundsException may be thrown if the coordinates are not in bounds, or if obj is non-null and is not large enough to hold the pixel data.

Parameters:

x - The X coordinate of the pixel location.

y - The Y coordinate of the pixel location.

obj - If non-null, a primitive array in which to return the pixel data.

data - The DataBuffer containing the image data.

Overrides:

getDataElements in class SampleModel

getPixel

public int[] getPixel(int x,
                      int y,
                      int[] iArray,
                      DataBuffer data)

Returns all samples for the specified pixel in an int array, one sample per array element. ArrayIndexOutOfBoundsException may be thrown if the coordinates are not in bounds.

Parameters:

x - The X coordinate of the pixel location.

y - The Y coordinate of the pixel location.

iArray - If non-null, returns the samples in this array.

data - The DataBuffer containing the image data.

Overrides:

getPixel in class SampleModel

getPixels

public int[] getPixels(int x,
                       int y,
                       int w,
                       int h,
                       int[] iArray,
                       DataBuffer data)

Returns all samples for the specified rectangle of pixels in an int array, one sample per array element. ArrayIndexOutOfBoundsException may be thrown if the coordinates are not in bounds.

Parameters:

x - The X coordinate of the upper left pixel location.

y - The Y coordinate of the upper left pixel location.

w - The width of the pixel rectangle.

h - The height of the pixel rectangle.

iArray - If non-null, returns the samples in this array.

data - The DataBuffer containing the image data.

Overrides:

getPixels in class SampleModel

getSample

public int getSample(int x,
                     int y,
                     int b,
                     DataBuffer data)

Returns as int the sample in a specified band for the pixel located at (x,y). ArrayIndexOutOfBoundsException may be thrown if the coordinates are not in bounds.

Parameters:

x - The X coordinate of the pixel location.

y - The Y coordinate of the pixel location.

b - The band to return.

data - The DataBuffer containing the image data.

Overrides:

getSample in class SampleModel

getSamples

public int[] getSamples(int x,
                        int y,
                        int w,
                        int h,
                        int b,
                        int[] iArray,
                        DataBuffer data)

Returns the samples in a specified band for the specified rectangle of pixels in an int array, one sample per data array element. ArrayIndexOutOfBoundsException may be thrown if the coordinates are not in bounds.

Parameters:

x - The X coordinate of the upper left pixel location.

y - The Y coordinate of the upper left pixel location.

w - The width of the pixel rectangle.

h - The height of the pixel rectangle.

b - The band to return.

iArray - If non-null, returns the samples in this array.

data - The DataBuffer containing the image data.

Overrides:

getSamples in class SampleModel

setDataElements

public void setDataElements(int x,
                            int y,
                            Object obj,
                            DataBuffer data)

Sets the data for a single pixel in the specified DataBuffer from a primitive array of type TransferType. For a ComponentSampleModel, this will be the same as the data type, and samples are transferred one per array element.

The following code illustrates transferring data for one pixel from DataBuffer db1, whose storage layout is described by ComponentSampleModel csm1, to DataBuffer db2, whose storage layout is described by ComponentSampleModel csm2. The transfer will generally be more efficient than using getPixel/setPixel.

 	     ComponentSampleModel csm1, csm2;
	     DataBufferInt db1, db2;
 	     csm2.setDataElements(x, y, csm1.getDataElements(x, y, null, db1),
                            db2);
 

Using getDataElements/setDataElements to transfer between two DataBuffer/SampleModel pairs is legitimate if the SampleModels have the same number of bands, corresponding bands have the same number of bits per sample, and the TransferTypes are the same.

obj must be a primitive array of type TransferType. Otherwise, a ClassCastException is thrown. An ArrayIndexOutOfBoundsException may be thrown if the coordinates are not in bounds, or if obj is not large enough to hold the pixel data.

Parameters:

x - The X coordinate of the pixel location.

y - The Y coordinate of the pixel location.

obj - A primitive array containing pixel data.

data - The DataBuffer containing the image data.

Overrides:

setDataElements in class SampleModel

setPixel

public void setPixel(int x,
                     int y,
                     int[] iArray,
                     DataBuffer data)

Sets a pixel in the DataBuffer using an int array of samples for input. ArrayIndexOutOfBoundsException may be thrown if the coordinates are not in bounds.

Parameters:

x - The X coordinate of the pixel location.

y - The Y coordinate of the pixel location.

iArray - The input samples in an int array.

data - The DataBuffer containing the image data.

Overrides:

setPixel in class SampleModel

setPixels

public void setPixels(int x,
                      int y,
                      int w,
                      int h,
                      int[] iArray,
                      DataBuffer data)

Sets all samples for a rectangle of pixels from an int array containing one sample per array element. ArrayIndexOutOfBoundsException may be thrown if the coordinates are not in bounds.

Parameters:

x - The X coordinate of the upper left pixel location.

y - The Y coordinate of the upper left pixel location.

w - The width of the pixel rectangle.

h - The height of the pixel rectangle.

iArray - The input samples in an int array.

data - The DataBuffer containing the image data.

Overrides:

setPixels in class SampleModel

setSample

public void setSample(int x,
                      int y,
                      int b,
                      int s,
                      DataBuffer data)

Sets a sample in the specified band for the pixel located at (x,y) in the DataBuffer using an int for input. ArrayIndexOutOfBoundsException may be thrown if the coordinates are not in bounds.

Parameters:

x - The X coordinate of the pixel location.

y - The Y coordinate of the pixel location.

b - The band to set.

s - The input sample as an int.

data - The DataBuffer containing the image data.

Overrides:

setSample in class SampleModel

setSamples

public void setSamples(int x,
                       int y,
                       int w,
                       int h,
                       int b,
                       int[] iArray,
                       DataBuffer data)

Sets the samples in the specified band for the specified rectangle of pixels from an int array containing one sample per data array element. ArrayIndexOutOfBoundsException may be thrown if the coordinates are not in bounds.

Parameters:

x - The X coordinate of the upper left pixel location.

y - The Y coordinate of the upper left pixel location.

w - The width of the pixel rectangle.

h - The height of the pixel rectangle.

b - The band to set.

iArray - The input samples in an int array.

data - The DataBuffer containing the image data.

Overrides:

setSamples in class SampleModel