JavaTM 2 Platform
Std. Ed. v1.3.1

java.awt.image
Class MultiPixelPackedSampleModel

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

public class MultiPixelPackedSampleModel
extends SampleModel

The MultiPixelPackedSampleModel class represents one-banded images and can pack multiple one-sample pixels into one data element. Pixels are not allowed to span data elements. The data type can be DataBuffer.TYPE_BYTE, DataBuffer.TYPE_USHORT, or DataBuffer.TYPE_INT. Each pixel must be a power of 2 number of bits and a power of 2 number of pixels must fit exactly in one data element. Pixel bit stride is equal to the number of bits per pixel. Scanline stride is in data elements and the last several data elements might be padded with unused pixels. Data bit offset is the offset in bits from the beginning of the DataBuffer to the first pixel and must be a multiple of pixel bit stride.

The following code illustrates extracting the bits for pixel x, y from DataBuffer data and storing the pixel data in data elements of type dataType:

      int dataElementSize = DataBuffer.getDataTypeSize(dataType);
      int bitnum = dataBitOffset + x*pixelBitStride;
      int element = data.getElem(y*scanlineStride + bitnum/dataElementSize);
      int shift = dataElementSize - (bitnum & (dataElementSize-1))
                  - pixelBitStride;
      int pixel = (element >> shift) & ((1 << pixelBitStride) - 1);
 


Fields inherited from class java.awt.image.SampleModel
dataType, height, numBands, width
 
Constructor Summary
MultiPixelPackedSampleModel(int dataType, int w, int h, int numberOfBits)
          Constructs a MultiPixelPackedSampleModel with the specified data type, width, height and number of bits per pixel.
MultiPixelPackedSampleModel(int dataType, int w, int h, int numberOfBits, int scanlineStride, int dataBitOffset)
          Constructs a MultiPixelPackedSampleModel with specified data type, width, height, number of bits per pixel, scanline stride and data bit offset.
 
Method Summary
 SampleModel createCompatibleSampleModel(int w, int h)
          Creates a new MultiPixelPackedSampleModel with the specified width and height.
 DataBuffer createDataBuffer()
          Creates a DataBuffer that corresponds to this MultiPixelPackedSampleModel.
 SampleModel createSubsetSampleModel(int[] bands)
          Creates a new MultiPixelPackedSampleModel with a subset of the bands of this MultiPixelPackedSampleModel.
 int getBitOffset(int x)
          Returns the offset, in bits, into the data element in which it is stored for the xth pixel of a scanline.
 int getDataBitOffset()
          Returns the data bit offset in bits.
 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 one pixel via the getDataElements(int, int, java.lang.Object, java.awt.image.DataBuffer) and setDataElements(int, int, java.lang.Object, java.awt.image.DataBuffer) methods.
 int getOffset(int x, int y)
          Returns the offset of pixel (x, y) in data array elements.
 int[] getPixel(int x, int y, int[] iArray, DataBuffer data)
          Returns the specified single band pixel in the first element of an int array.
 int getPixelBitStride()
          Returns the pixel bit stride in bits.
 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[] 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.
 int getTransferType()
          Returns the TransferType used to transfer pixels by way of the getDataElements and setDataElements methods.
 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 for input.
 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.
 
Methods inherited from class java.awt.image.SampleModel
getDataElements, getDataType, getHeight, getNumBands, getPixel, getPixel, getPixels, getPixels, getPixels, getSampleDouble, getSampleFloat, getSamples, getSamples, getSamples, getWidth, setDataElements, setPixel, setPixel, setPixels, setPixels, setPixels, setSample, setSample, setSamples, setSamples, setSamples
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

MultiPixelPackedSampleModel

public MultiPixelPackedSampleModel(int dataType,
                                   int w,
                                   int h,
                                   int numberOfBits)
Constructs a MultiPixelPackedSampleModel with the specified data type, width, height and number of bits per pixel.
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
numberOfBits - the number of bits per pixel
Throws:
IllegalArgumentException - if dataType is not either DataBuffer.TYPE_BYTE, DataBuffer.TYPE_USHORT, or DataBuffer.TYPE_INT

MultiPixelPackedSampleModel

public MultiPixelPackedSampleModel(int dataType,
                                   int w,
                                   int h,
                                   int numberOfBits,
                                   int scanlineStride,
                                   int dataBitOffset)
Constructs a MultiPixelPackedSampleModel with specified data type, width, height, number of bits per pixel, scanline stride and data bit offset.
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
numberOfBits - the number of bits per pixel
scanlineStride - the line stride of the image data
dataBitOffset - the data bit offset for the region of image data described
Throws:
RasterFormatException - if the number of bits per pixel is not a power of 2 or if a power of 2 number of pixels do not fit in one data element.
IllegalArgumentException - if w or h is not greater than 0
IllegalArgumentException - if dataType is not either DataBuffer.TYPE_BYTE, DataBuffer.TYPE_USHORT, or DataBuffer.TYPE_INT
Method Detail

createCompatibleSampleModel

public SampleModel createCompatibleSampleModel(int w,
                                               int h)
Creates a new MultiPixelPackedSampleModel with the specified width and height. The new MultiPixelPackedSampleModel has the same storage data type and number of bits per pixel as this MultiPixelPackedSampleModel.
Overrides:
createCompatibleSampleModel in class SampleModel
Parameters:
w - the specified width
h - the specified height
Returns:
a SampleModel with the specified width and height and with the same storage data type and number of bits per pixel as this MultiPixelPackedSampleModel.
Throws:
IllegalArgumentException - if w or h is not greater than 0

createDataBuffer

public DataBuffer createDataBuffer()
Creates a DataBuffer that corresponds to this MultiPixelPackedSampleModel. The DataBuffer object's data type and size is consistent with this MultiPixelPackedSampleModel. The DataBuffer has a single bank.
Overrides:
createDataBuffer in class SampleModel
Returns:
a DataBuffer with the same data type and size as this MultiPixelPackedSampleModel.

getNumDataElements

public int getNumDataElements()
Returns the number of data elements needed to transfer one pixel via the getDataElements(int, int, java.lang.Object, java.awt.image.DataBuffer) and setDataElements(int, int, java.lang.Object, java.awt.image.DataBuffer) methods. For a MultiPixelPackedSampleModel, this is one.
Overrides:
getNumDataElements in class SampleModel
Returns:
the number of data elements.

getSampleSize

public int[] getSampleSize()
Returns the number of bits per sample for all bands.
Overrides:
getSampleSize in class SampleModel
Returns:
the number of bits per sample.

getSampleSize

public int getSampleSize(int band)
Returns the number of bits per sample for the specified band.
Overrides:
getSampleSize in class SampleModel
Parameters:
band - the specified band
Returns:
the number of bits per sample for the specified band.

getOffset

public int getOffset(int x,
                     int y)
Returns the offset of pixel (x, y) in data array elements.
Parameters:
x, y - the specified pixel
Returns:
the offset of the specified pixel.

getBitOffset

public int getBitOffset(int x)
Returns the offset, in bits, into the data element in which it is stored for the xth pixel of a scanline. This offset is the same for all scanlines.
Parameters:
x - the specified pixel
Returns:
the bit offset of the specified pixel.

getScanlineStride

public int getScanlineStride()
Returns the scanline stride.
Returns:
the scanline stride of this MultiPixelPackedSampleModel.

getPixelBitStride

public int getPixelBitStride()
Returns the pixel bit stride in bits. This value is the same as the number of bits per pixel.
Returns:
the pixelBitStride of this MultiPixelPackedSampleModel.

getDataBitOffset

public int getDataBitOffset()
Returns the data bit offset in bits.
Returns:
the dataBitOffset of this MultiPixelPackedSampleModel.

getTransferType

public int getTransferType()
Returns the TransferType used to transfer pixels by way of the getDataElements and setDataElements methods. The TransferType might or might not be the same as the storage DataType. The TransferType is one of DataBuffer.TYPE_BYTE, DataBuffer.TYPE_USHORT, or DataBuffer.TYPE_INT.
Overrides:
getTransferType in class SampleModel
Returns:
the transfertype.

createSubsetSampleModel

public SampleModel createSubsetSampleModel(int[] bands)
Creates a new MultiPixelPackedSampleModel with a subset of the bands of this MultiPixelPackedSampleModel. Since a MultiPixelPackedSampleModel only has one band, the bands argument must have a length of one and indicate the zeroth band.
Overrides:
createSubsetSampleModel in class SampleModel
Parameters:
bands - the specified bands
Returns:
a new SampleModel with a subset of bands of this MultiPixelPackedSampleModel.
Throws:
RasterFormatException - if the number of bands requested is not one.
IllegalArgumentException - if w or h is not greater than 0

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). An ArrayIndexOutOfBoundsException is thrown if the coordinates are not in bounds.
Overrides:
getSample in class SampleModel
Parameters:
x, y - the coordinates of the specified pixel
b - the band to return, which is assumed to be 0
data - the DataBuffer containing the image data
Returns:
the specified band containing the sample of the specified pixel.
Throws:
ArrayIndexOutOfBoundException - if the specified coordinates are not in bounds.

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. An ArrayIndexOutOfBoundsException is thrown if the coordinates are not in bounds.
Overrides:
setSample in class SampleModel
Parameters:
x, y - the coordinates of the specified pixel
b - the band to return, which is assumed to be 0
s - the input sample as an int
data - the DataBuffer where image data is stored
Throws:
ArrayIndexOutOfBoundsException - if the coordinates are not in bounds.

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 MultiPixelPackedSampleModel, the array has one element, and the type is the smallest of DataBuffer.TYPE_BYTE, DataBuffer.TYPE_USHORT, or DataBuffer.TYPE_INT that can hold a single pixel. Generally, obj should be passed in as null, so that the Object is created automatically and is the correct primitive data type.

The following code illustrates transferring data for one pixel from DataBuffer db1, whose storage layout is described by MultiPixelPackedSampleModel mppsm1, to DataBuffer db2, whose storage layout is described by MultiPixelPackedSampleModel mppsm2. The transfer is generally more efficient than using getPixel or setPixel.

 	     MultiPixelPackedSampleModel mppsm1, mppsm2;
	     DataBufferInt db1, db2;
 	     mppsm2.setDataElements(x, y, mppsm1.getDataElements(x, y, null,
                              db1), db2);
 
Using getDataElements or 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 not null, it should be a primitive array of type TransferType. Otherwise, a ClassCastException is thrown. An ArrayIndexOutOfBoundsException is thrown if the coordinates are not in bounds, or if obj is not null and is not large enough to hold the pixel data.

Overrides:
getDataElements in class SampleModel
Parameters:
x, y - coordinates of the pixel location.
obj - a primitive array in which to return the pixel data or null.
data - the DataBuffer containing the image data.
Returns:
an Object containing data for the specified pixel.
Throws:
ClassCastException - if obj is not a primitive array of type TransferType or is not null
ArrayIndexOutOfBoundsException - if the coordinates are not in bounds, or if obj is not null or not large enough to hold the pixel data

getPixel

public int[] getPixel(int x,
                      int y,
                      int[] iArray,
                      DataBuffer data)
Returns the specified single band pixel in the first element of an int array. ArrayIndexOutOfBoundsException is thrown if the coordinates are not in bounds.
Overrides:
getPixel in class SampleModel
Parameters:
x, y - the coordinates of the pixel location
iArray - the array containing the pixel to be returned or null
data - the DataBuffer where image data is stored
Returns:
an array containing the specified pixel.
Throws:
ArrayIndexOutOfBoundsException - if the coordinates are not in bounds

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 MultiPixelPackedSampleModel, only the first element of the array holds valid data, and the type must be the smallest of DataBuffer.TYPE_BYTE, DataBuffer.TYPE_USHORT, or DataBuffer.TYPE_INT that can hold a single pixel.

The following code illustrates transferring data for one pixel from DataBuffer db1, whose storage layout is described by MultiPixelPackedSampleModel mppsm1, to DataBuffer db2, whose storage layout is described by MultiPixelPackedSampleModel mppsm2. The transfer is generally more efficient than using getPixel or setPixel.

 	     MultiPixelPackedSampleModel mppsm1, mppsm2;
	     DataBufferInt db1, db2;
 	     mppsm2.setDataElements(x, y, mppsm1.getDataElements(x, y, null,
                              db1), db2);
 
Using getDataElements or setDataElements to transfer between two DataBuffer/SampleModel pairs is legitimate if the SampleModel objects 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 is thrown if the coordinates are not in bounds, or if obj is not large enough to hold the pixel data.

Overrides:
setDataElements in class SampleModel
Parameters:
x, y - the coordinates of the pixel location
obj - a primitive array containing pixel data
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 for input. ArrayIndexOutOfBoundsException is thrown if the coordinates are not in bounds.
Overrides:
setPixel in class SampleModel
Parameters:
x, y - the coordinates of the pixel location
iArray - the input pixel in an int array
data - the DataBuffer containing the image data

JavaTM 2 Platform
Std. Ed. v1.3.1

Submit a bug or feature
For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

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