java.awt.image
class BandedSampleModel

java.lang.Object java.awt.image.SampleModel java.awt.image.ComponentSampleModel java.awt.image.BandedSampleModel

public final class BandedSampleModel
extends ComponentSampleModel

This class represents image data which is stored in a band 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 band interleaved image data than is provided by ComponentSampleModel. This class should typically be used when working with images which store sample data for each band in a different 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. The pixel stride for a BandedSampleModel is one. 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 {@link DataBuffer#TYPE_BYTE TYPE_BYTE}, {@link DataBuffer#TYPE_USHORT TYPE_USHORT}, {@link DataBuffer#TYPE_SHORT TYPE_SHORT}, {@link DataBuffer#TYPE_INT TYPE_INT}, {@link DataBuffer#TYPE_FLOAT TYPE_FLOAT}, and {@link DataBuffer#TYPE_DOUBLE TYPE_DOUBLE} datatypes

BandedSampleModel

public BandedSampleModel(int dataType,
                         int w,
                         int h,
                         int numBands)

Constructs a BandedSampleModel with the specified parameters. The pixel stride will be one data element. The scanline stride will be the same as the width. Each band will be stored in a separate bank and all band offsets will be zero.

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.

numBands - The number of bands for the image data.

BandedSampleModel

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

Constructs a BandedSampleModel with the specified parameters. The number of bands will be inferred from the lengths of the bandOffsets bankIndices arrays, which must be equal. The pixel stride will be one data element.

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.

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

bankIndices - The bank index for each band.

bandOffsets - The band offset for each band.

createCompatibleSampleModel

public SampleModel createCompatibleSampleModel(int w,
                                               int h)

Creates a new BandedSampleModel with the specified width and height. The new BandedSampleModel will have the same number of bands, storage data type, and bank indices as this BandedSampleModel. The band offsets will be compressed such that the offset between bands will be w*pixelStride and the minimum of all of the band offsets is zero.

Overrides:

createCompatibleSampleModel in class ComponentSampleModel

Parameters:

w - the width of the resulting BandedSampleModel

h - the height of the resulting BandedSampleModel

Returns:

a new BandedSampleModel with the specified width and height.

createDataBuffer

public DataBuffer createDataBuffer()

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

Overrides:

createDataBuffer in class ComponentSampleModel

createSubsetSampleModel

public SampleModel createSubsetSampleModel(int[] bands)

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

Overrides:

createSubsetSampleModel in class ComponentSampleModel

Parameters:

bands

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 BandedSampleModel, 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 BandedSampleModel bsm1, to DataBuffer db2, whose storage layout is described by BandedSampleModel bsm2. The transfer will generally be more efficient than using getPixel/setPixel.

 	     BandedSampleModel bsm1, bsm2;
	     DataBufferInt db1, db2;
 	     bsm2.setDataElements(x, y, bsm1.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.

Overrides:

getDataElements in class ComponentSampleModel

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.

Returns:

the data for the specified pixel.

getPixel

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

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

Overrides:

getPixel in class ComponentSampleModel

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

Returns:

the samples for the specified pixel.

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 data array element. ArrayIndexOutOfBoundsException may be thrown if the coordinates are not in bounds.

Overrides:

getPixels in class ComponentSampleModel

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

Returns:

the samples for the pixels within the specified region.

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.

Overrides:

getSample in class ComponentSampleModel

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

Returns:

the sample in the specified band for the specified pixel.

getSampleDouble

public double getSampleDouble(int x,
                              int y,
                              int b,
                              DataBuffer data)

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

Overrides:

getSampleDouble in class ComponentSampleModel

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

Returns:

a double value that represents the sample in the specified band for the specified pixel.

getSampleFloat

public float getSampleFloat(int x,
                            int y,
                            int b,
                            DataBuffer data)

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

Overrides:

getSampleFloat in class ComponentSampleModel

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

Returns:

a float value that represents the sample in the specified band for the specified pixel.

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.

Overrides:

getSamples in class ComponentSampleModel

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

Returns:

the samples in the specified band for the pixels within the specified region.

hashCode

public int hashCode()

Overrides:

hashCode in class ComponentSampleModel

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 BandedSampleModel, 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 BandedSampleModel bsm1, to DataBuffer db2, whose storage layout is described by BandedSampleModel bsm2. The transfer will generally be more efficient than using getPixel/setPixel.

 	     BandedSampleModel bsm1, bsm2;
	     DataBufferInt db1, db2;
 	     bsm2.setDataElements(x, y, bsm1.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.

Overrides:

setDataElements in class ComponentSampleModel

Parameters:

x - The X coordinate of the pixel location

y - The Y coordinate of the pixel location

obj - If non-null, returns the primitive array in this object

data - The DataBuffer containing the image data

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.

Overrides:

setPixel in class ComponentSampleModel

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

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.

Overrides:

setPixels in class ComponentSampleModel

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

setSample

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

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

Overrides:

setSample in class ComponentSampleModel

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 a double

data - The DataBuffer containing the image data

setSample

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

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

Overrides:

setSample in class ComponentSampleModel

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 a float

data - The DataBuffer containing the image data

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.

Overrides:

setSample in class ComponentSampleModel

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

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.

Overrides:

setSamples in class ComponentSampleModel

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 sample array

data - The DataBuffer containing the image data