JavaTM 2 Platform
Std. Ed. v1.3.1

java.awt.image
Class SinglePixelPackedSampleModel

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

public class SinglePixelPackedSampleModel
extends SampleModel

This class represents pixel data packed such that the N samples which make up a single pixel are stored in a single data array element, and each data data array element holds samples for only one pixel. This class supports TYPE_BYTE, TYPE_USHORT, TYPE_INT data types. All data array elements reside in the first bank of a DataBuffer. Accessor methods are provided so that the image data can be manipulated directly. 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. Bit masks are the masks required to extract the samples representing the bands of the pixel. Bit offsets are the offsets in bits into the data array element of the samples representing the bands of the pixel.

The following code illustrates extracting the bits of the sample representing band b for pixel x,y from DataBuffer data:

      int sample = data.getElem(y * scanlineStride + x);
      sample = (sample & bitMasks[b]) >>> bitOffsets[b];
 


Fields inherited from class java.awt.image.SampleModel
dataType, height, numBands, width
 
Constructor Summary
SinglePixelPackedSampleModel(int dataType, int w, int h, int[] bitMasks)
          Constructs a SinglePixelPackedSampleModel with bitMasks.length bands.
SinglePixelPackedSampleModel(int dataType, int w, int h, int scanlineStride, int[] bitMasks)
          Constructs a SinglePixelPackedSampleModel with bitMasks.length bands and a scanline stride equal to scanlineStride data array elements.
 
Method Summary
 SampleModel createCompatibleSampleModel(int w, int h)
          This creates a new SinglePixelPackedSampleModel with the specified width and height.
 DataBuffer createDataBuffer()
          Creates a DataBuffer that corresponds to this SinglePixelPackedSampleModel.
 SampleModel createSubsetSampleModel(int[] bands)
          This creates a new SinglePixelPackedSampleModel with a subset of the bands of this SinglePixelPackedSampleModel.
 int[] getBitMasks()
          Returns the bit masks for all bands.
 int[] getBitOffsets()
          Returns the bit offsets into the data array element representing a pixel 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 one pixel via the getDataElements and setDataElements methods.
 int getOffset(int x, int y)
          Returns the offset (in data array elements) of pixel (x,y).
 int[] getPixel(int x, int y, int[] iArray, DataBuffer data)
          Returns all samples in for the specified pixel in an int array.
 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 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 for a specified band for the specified rectangle of pixels in an int array, one sample per 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 SinglePixelPackedSampleModel.
 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 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
 

Constructor Detail

SinglePixelPackedSampleModel

public SinglePixelPackedSampleModel(int dataType,
                                    int w,
                                    int h,
                                    int[] bitMasks)
Constructs a SinglePixelPackedSampleModel with bitMasks.length bands. Each sample is stored in a data array element in the position of its corresponding bit mask. Each bit mask must be contiguous and masks must not overlap.
Parameters:
dataType - The data type for storing samples.
w - The width (in pixels) of the region of the image data described.
h - The height (in pixels) of the region of the image data described.
bitMasks - The bit masks for all bands.
Throws:
IllegalArgumentException - if dataType is not either DataBuffer.TYPE_BYTE, DataBuffer.TYPE_USHORT, or DataBuffer.TYPE_INT

SinglePixelPackedSampleModel

public SinglePixelPackedSampleModel(int dataType,
                                    int w,
                                    int h,
                                    int scanlineStride,
                                    int[] bitMasks)
Constructs a SinglePixelPackedSampleModel with bitMasks.length bands and a scanline stride equal to scanlineStride data array elements. Each sample is stored in a data array element in the position of its corresponding bit mask. Each bit mask must be contiguous and masks must not overlap.
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 image data.
bitMasks - The bit masks for all bands.
Throws:
IllegalArgumentException - if w or h is not greater than 0
IllegalArgumentException - if any mask in bitMask is not contiguous
IllegalArgumentException - if dataType is not either DataBuffer.TYPE_BYTE, DataBuffer.TYPE_USHORT, or DataBuffer.TYPE_INT
Method Detail

getNumDataElements

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

createCompatibleSampleModel

public SampleModel createCompatibleSampleModel(int w,
                                               int h)
This creates a new SinglePixelPackedSampleModel with the specified width and height. The new SinglePixelPackedSampleModel will have the same storage data type and bit masks as this SinglePixelPackedSampleModel.
Overrides:
createCompatibleSampleModel in class SampleModel
Parameters:
w - the width of the resulting SampleModel
h - the height of the resulting SampleModel
Throws:
IllegalArgumentException - if w or h is not greater than 0

createDataBuffer

public DataBuffer createDataBuffer()
Creates a DataBuffer that corresponds to this SinglePixelPackedSampleModel. The DataBuffer's data type and size will be consistent with this SinglePixelPackedSampleModel. The DataBuffer will have a single bank.
Overrides:
createDataBuffer in class SampleModel

getSampleSize

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

getSampleSize

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

getOffset

public int getOffset(int x,
                     int y)
Returns the offset (in data array elements) of pixel (x,y). The data element containing pixel x,y can be retrieved from a DataBuffer data with a SinglePixelPackedSampleModel sppsm as:
        data.getElem(sppsm.getOffset(x, y));
 

getBitOffsets

public int[] getBitOffsets()
Returns the bit offsets into the data array element representing a pixel for all bands.

getBitMasks

public int[] getBitMasks()
Returns the bit masks for all bands.

getScanlineStride

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

createSubsetSampleModel

public SampleModel createSubsetSampleModel(int[] bands)
This creates a new SinglePixelPackedSampleModel with a subset of the bands of this SinglePixelPackedSampleModel. The new SinglePixelPackedSampleModel can be used with any DataBuffer that the existing SinglePixelPackedSampleModel can be used with. The new SinglePixelPackedSampleModel/DataBuffer combination will represent an image with a subset of the bands of the original SinglePixelPackedSampleModel/DataBuffer combination.
Overrides:
createSubsetSampleModel in class SampleModel
Throws:
RasterFormatException - if the length of the bands argument is greater than the number of bands in the sample model.

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 SinglePixelPackedSampleModel, the array will have one element, and the type will be the same as the storage data type. 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 SinglePixelPackedSampleModel sppsm1, to DataBuffer db2, whose storage layout is described by SinglePixelPackedSampleModel sppsm2. The transfer will generally be more efficient than using getPixel/setPixel.

 	     SinglePixelPackedSampleModel sppsm1, sppsm2;
	     DataBufferInt db1, db2;
 	     sppsm2.setDataElements(x, y, sppsm1.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 SampleModel
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.

getPixel

public int[] getPixel(int x,
                      int y,
                      int[] iArray,
                      DataBuffer data)
Returns all samples in for the specified pixel in an int array. ArrayIndexOutOfBoundsException may be thrown if the coordinates are not in bounds.
Overrides:
getPixel in class SampleModel
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.

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.
Overrides:
getPixels in class SampleModel
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.

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 SampleModel
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.

getSamples

public int[] getSamples(int x,
                        int y,
                        int w,
                        int h,
                        int b,
                        int[] iArray,
                        DataBuffer data)
Returns the samples for a specified band 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.
Overrides:
getSamples in class SampleModel
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.

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 SinglePixelPackedSampleModel, only the first element of the array will hold valid data, and the type of the array must be the same as the storage data type of the SinglePixelPackedSampleModel.

The following code illustrates transferring data for one pixel from DataBuffer db1, whose storage layout is described by SinglePixelPackedSampleModel sppsm1, to DataBuffer db2, whose storage layout is described by SinglePixelPackedSampleModel sppsm2. The transfer will generally be more efficient than using getPixel/setPixel.

 	     SinglePixelPackedSampleModel sppsm1, sppsm2;
	     DataBufferInt db1, db2;
 	     sppsm2.setDataElements(x, y, sppsm1.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 SampleModel
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.

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 SampleModel
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 SampleModel
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,
                      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 SampleModel
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 array element. ArrayIndexOutOfBoundsException may be thrown if the coordinates are not in bounds.
Overrides:
setSamples in class SampleModel
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.

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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