javax.media.jai
Class ComponentSampleModelJAI

java.lang.Object
  extended byjava.awt.image.SampleModel
      extended byjava.awt.image.ComponentSampleModel
          extended byjavax.media.jai.ComponentSampleModelJAI

public class ComponentSampleModelJAI
extends ComponentSampleModel

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 the dataTypes enumerated in java.awt.image.DataBuffer (all samples of a given ComponentSampleModel are stored with the same precision) . This class adds support for Double and Float data types in addition to those supported by the ComponentSampleModel class in Java 2D. All strides and offsets must be non-negative.

See Also:
ComponentSampleModel

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
ComponentSampleModelJAI(int dataType, int w, int h, int pixelStride, int scanlineStride, int[] bandOffsets)
          Constructs a ComponentSampleModel with the specified parameters.
ComponentSampleModelJAI(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.
 Object getDataElements(int x, int y, int w, int h, Object obj, DataBuffer data)
          Returns the pixel data for the specified rectangle of pixels in a primitive array of type TransferType.
 Object getDataElements(int x, int y, Object obj, DataBuffer data)
          Returns data for a single pixel in a primitive array of type TransferType.
 double[] getPixels(int x, int y, int w, int h, double[] dArray, DataBuffer data)
          Returns all samples for a rectangle of pixels in a double array, one sample per array element.
 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.
 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.
 void setDataElements(int x, int y, int w, int h, Object obj, DataBuffer data)
          Sets the data for a rectangle of pixels in the specified DataBuffer from a primitive array of type TransferType.
 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 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.
 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.
 String toString()
          Returns a String containing the values of all valid fields.
 
Methods inherited from class java.awt.image.ComponentSampleModel
equals, getBandOffsets, getBankIndices, getNumDataElements, getOffset, getOffset, getPixel, getPixels, getPixelStride, getSample, getSamples, getSampleSize, getSampleSize, getScanlineStride, hashCode, setPixel, setPixels, setSample, setSamples
 
Methods inherited from class java.awt.image.SampleModel
getDataType, getHeight, getNumBands, getPixel, getPixel, getPixels, getSamples, getSamples, getTransferType, getWidth, setPixel, setPixel, setPixels, setPixels, setSamples, setSamples
 
Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
 

Constructor Detail

ComponentSampleModelJAI

public ComponentSampleModelJAI(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.

ComponentSampleModelJAI

public ComponentSampleModelJAI(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.
bankIndices - 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.

Parameters:
w - The width in pixels.
h - The height in pixels

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.

Parameters:
bands - subset of bands of this ComponentSampleModel

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.


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.

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.
Throws:
ClassCastException - if obj is non-null and is not a primitive array of type TransferType.
ArrayIndexOutOfBoundsException - if the coordinates are not in bounds, or if obj is non-null and is not large enough to hold the pixel data.

getDataElements

public Object getDataElements(int x,
                              int y,
                              int w,
                              int h,
                              Object obj,
                              DataBuffer data)
Returns the pixel data for the specified rectangle of pixels in a primitive array of type TransferType. For image data supported by the Java 2D API, this will be one of the dataTypes supported by java.awt.image.DataBuffer. Data may be returned in a packed format, thus increasing efficiency for data transfers. 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 a rectangular region of pixels from DataBuffer db1, whose storage layout is described by SampleModel sm1, to DataBuffer db2, whose storage layout is described by SampleModel sm2. The transfer will generally be more efficient than using getPixels/setPixels.

       SampleModel sm1, sm2;
       DataBuffer db1, db2;
       sm2.setDataElements(x, y, w, h, sm1.getDataElements(x, y, w,
                           h, 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.

Parameters:
x - The minimum X coordinate of the pixel rectangle.
y - The minimum Y coordinate of the pixel rectangle.
w - The width of the pixel rectangle.
h - The height of the pixel rectangle.
obj - If non-null, a primitive array in which to return the pixel data.
data - The DataBuffer containing the image data.
Throws:
ClassCastException - if obj is non-null and is not a primitive array of type TransferType.
ArrayIndexOutOfBoundsException - if the coordinates are not in bounds, or if obj is non-null and is not large enough to hold the pixel data.
See Also:
ComponentSampleModel.getNumDataElements(), SampleModel.getTransferType(), DataBuffer

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.

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.
Throws:
ClassCastException - if obj is non-null and is not a primitive array of type TransferType.
ArrayIndexOutOfBoundsException - if the coordinates are not in bounds, or if obj is non-null and is not large enough to hold the pixel data.

setDataElements

public void setDataElements(int x,
                            int y,
                            int w,
                            int h,
                            Object obj,
                            DataBuffer data)
Sets the data for a rectangle of pixels in the specified DataBuffer from a primitive array of type TransferType. For image data supported by the Java 2D API, this will be one of the dataTypes supported by java.awt.image.DataBuffer. Data in the array may be in a packed format, thus increasing efficiency for data transfers.

The following code illustrates transferring data for a rectangular region of pixels from DataBuffer db1, whose storage layout is described by SampleModel sm1, to DataBuffer db2, whose storage layout is described by SampleModel sm2. The transfer will generally be more efficient than using getPixels/setPixels.

       SampleModel sm1, sm2;
       DataBuffer db1, db2;
       sm2.setDataElements(x, y, w, h, sm1.getDataElements(x, y, w, h,
                           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.

Parameters:
x - The minimum X coordinate of the pixel rectangle.
y - The minimum Y coordinate of the pixel rectangle.
w - The width of the pixel rectangle.
h - The height of the pixel rectangle.
obj - A primitive array containing pixel data.
data - The DataBuffer containing the image data.
Throws:
ClassCastException - if obj is non-null and is not a primitive array of type TransferType.
ArrayIndexOutOfBoundsException - if the coordinates are not in bounds, or if obj is non-null and is not large enough to hold the pixel data.
See Also:
ComponentSampleModel.getNumDataElements(), SampleModel.getTransferType(), DataBuffer

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.

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.
Throws:
ArrayIndexOutOfBoundsException - if coordinates are not in bounds

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.

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:
sample The floating point sample value
Throws:
ArrayIndexOutOfBoundsException - if coordinates are not in bounds

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.

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.
Throws:
ArrayIndexOutOfBoundsException - if coordinates are not in bounds

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.

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:
sample The double sample value
Throws:
ArrayIndexOutOfBoundsException - if coordinates are not in bounds

getPixels

public double[] getPixels(int x,
                          int y,
                          int w,
                          int h,
                          double[] dArray,
                          DataBuffer data)
Returns all samples for a rectangle of pixels in a double 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.
dArray - If non-null, returns the samples in this array.
data - The DataBuffer containing the image data.
Throws:
ArrayIndexOutOfBoundsException - if coordinates are not in bounds

toString

public String toString()
Returns a String containing the values of all valid fields.