Java™ Platform
Standard Ed. 6

java.awt.image
Class Raster

java.lang.Object
  extended by java.awt.image.Raster
Direct Known Subclasses:
WritableRaster

public class Raster
extends Object

A class representing a rectangular array of pixels. A Raster encapsulates a DataBuffer that stores the sample values and a SampleModel that describes how to locate a given sample value in a DataBuffer.

A Raster defines values for pixels occupying a particular rectangular area of the plane, not necessarily including (0, 0). The rectangle, known as the Raster's bounding rectangle and available by means of the getBounds method, is defined by minX, minY, width, and height values. The minX and minY values define the coordinate of the upper left corner of the Raster. References to pixels outside of the bounding rectangle may result in an exception being thrown, or may result in references to unintended elements of the Raster's associated DataBuffer. It is the user's responsibility to avoid accessing such pixels.

A SampleModel describes how samples of a Raster are stored in the primitive array elements of a DataBuffer. Samples may be stored one per data element, as in a PixelInterleavedSampleModel or BandedSampleModel, or packed several to an element, as in a SinglePixelPackedSampleModel or MultiPixelPackedSampleModel. The SampleModel is also controls whether samples are sign extended, allowing unsigned data to be stored in signed Java data types such as byte, short, and int.

Although a Raster may live anywhere in the plane, a SampleModel makes use of a simple coordinate system that starts at (0, 0). A Raster therefore contains a translation factor that allows pixel locations to be mapped between the Raster's coordinate system and that of the SampleModel. The translation from the SampleModel coordinate system to that of the Raster may be obtained by the getSampleModelTranslateX and getSampleModelTranslateY methods.

A Raster may share a DataBuffer with another Raster either by explicit construction or by the use of the createChild and createTranslatedChild methods. Rasters created by these methods can return a reference to the Raster they were created from by means of the getParent method. For a Raster that was not constructed by means of a call to createTranslatedChild or createChild, getParent will return null.

The createTranslatedChild method returns a new Raster that shares all of the data of the current Raster, but occupies a bounding rectangle of the same width and height but with a different starting point. For example, if the parent Raster occupied the region (10, 10) to (100, 100), and the translated Raster was defined to start at (50, 50), then pixel (20, 20) of the parent and pixel (60, 60) of the child occupy the same location in the DataBuffer shared by the two Rasters. In the first case, (-10, -10) should be added to a pixel coordinate to obtain the corresponding SampleModel coordinate, and in the second case (-50, -50) should be added.

The translation between a parent and child Raster may be determined by subtracting the child's sampleModelTranslateX and sampleModelTranslateY values from those of the parent.

The createChild method may be used to create a new Raster occupying only a subset of its parent's bounding rectangle (with the same or a translated coordinate system) or with a subset of the bands of its parent.

All constructors are protected. The correct way to create a Raster is to use one of the static create methods defined in this class. These methods create instances of Raster that use the standard Interleaved, Banded, and Packed SampleModels and that may be processed more efficiently than a Raster created by combining an externally generated SampleModel and DataBuffer.

See Also:
DataBuffer, SampleModel, PixelInterleavedSampleModel, BandedSampleModel, SinglePixelPackedSampleModel, MultiPixelPackedSampleModel

Field Summary
protected  DataBuffer dataBuffer
          The DataBuffer that stores the image data.
protected  int height
          The height of this Raster.
protected  int minX
          The X coordinate of the upper-left pixel of this Raster.
protected  int minY
          The Y coordinate of the upper-left pixel of this Raster.
protected  int numBands
          The number of bands in the Raster.
protected  int numDataElements
          The number of DataBuffer data elements per pixel.
protected  Raster parent
          The parent of this Raster, or null.
protected  SampleModel sampleModel
          The SampleModel that describes how pixels from this Raster are stored in the DataBuffer.
protected  int sampleModelTranslateX
          The X translation from the coordinate space of the Raster's SampleModel to that of the Raster.
protected  int sampleModelTranslateY
          The Y translation from the coordinate space of the Raster's SampleModel to that of the Raster.
protected  int width
          The width of this Raster.
 
Constructor Summary
protected Raster(SampleModel sampleModel, DataBuffer dataBuffer, Point origin)
          Constructs a Raster with the given SampleModel and DataBuffer.
protected Raster(SampleModel sampleModel, DataBuffer dataBuffer, Rectangle aRegion, Point sampleModelTranslate, Raster parent)
          Constructs a Raster with the given SampleModel, DataBuffer, and parent.
protected Raster(SampleModel sampleModel, Point origin)
          Constructs a Raster with the given SampleModel.
 
Method Summary
static WritableRaster createBandedRaster(DataBuffer dataBuffer, int w, int h, int scanlineStride, int[] bankIndices, int[] bandOffsets, Point location)
          Creates a Raster based on a BandedSampleModel with the specified DataBuffer, width, height, scanline stride, bank indices, and band offsets.
static WritableRaster createBandedRaster(int dataType, int w, int h, int scanlineStride, int[] bankIndices, int[] bandOffsets, Point location)
          Creates a Raster based on a BandedSampleModel with the specified data type, width, height, scanline stride, bank indices and band offsets.
static WritableRaster createBandedRaster(int dataType, int w, int h, int bands, Point location)
          Creates a Raster based on a BandedSampleModel with the specified data type, width, height, and number of bands.
 Raster createChild(int parentX, int parentY, int width, int height, int childMinX, int childMinY, int[] bandList)
          Returns a new Raster which shares all or part of this Raster's DataBuffer.
 WritableRaster createCompatibleWritableRaster()
          Create a compatible WritableRaster the same size as this Raster with the same SampleModel and a new initialized DataBuffer.
 WritableRaster createCompatibleWritableRaster(int w, int h)
          Create a compatible WritableRaster with the specified size, a new SampleModel, and a new initialized DataBuffer.
 WritableRaster createCompatibleWritableRaster(int x, int y, int w, int h)
          Create a compatible WritableRaster with the specified location (minX, minY) and size (width, height), a new SampleModel, and a new initialized DataBuffer.
 WritableRaster createCompatibleWritableRaster(Rectangle rect)
          Create a compatible WritableRaster with location (minX, minY) and size (width, height) specified by rect, a new SampleModel, and a new initialized DataBuffer.
static WritableRaster createInterleavedRaster(DataBuffer dataBuffer, int w, int h, int scanlineStride, int pixelStride, int[] bandOffsets, Point location)
          Creates a Raster based on a PixelInterleavedSampleModel with the specified DataBuffer, width, height, scanline stride, pixel stride, and band offsets.
static WritableRaster createInterleavedRaster(int dataType, int w, int h, int scanlineStride, int pixelStride, int[] bandOffsets, Point location)
          Creates a Raster based on a PixelInterleavedSampleModel with the specified data type, width, height, scanline stride, pixel stride, and band offsets.
static WritableRaster createInterleavedRaster(int dataType, int w, int h, int bands, Point location)
          Creates a Raster based on a PixelInterleavedSampleModel with the specified data type, width, height, and number of bands.
static WritableRaster createPackedRaster(DataBuffer dataBuffer, int w, int h, int scanlineStride, int[] bandMasks, Point location)
          Creates a Raster based on a SinglePixelPackedSampleModel with the specified DataBuffer, width, height, scanline stride, and band masks.
static WritableRaster createPackedRaster(DataBuffer dataBuffer, int w, int h, int bitsPerPixel, Point location)
          Creates a Raster based on a MultiPixelPackedSampleModel with the specified DataBuffer, width, height, and bits per pixel.
static WritableRaster createPackedRaster(int dataType, int w, int h, int[] bandMasks, Point location)
          Creates a Raster based on a SinglePixelPackedSampleModel with the specified data type, width, height, and band masks.
static WritableRaster createPackedRaster(int dataType, int w, int h, int bands, int bitsPerBand, Point location)
          Creates a Raster based on a packed SampleModel with the specified data type, width, height, number of bands, and bits per band.
static Raster createRaster(SampleModel sm, DataBuffer db, Point location)
          Creates a Raster with the specified SampleModel and DataBuffer.
 Raster createTranslatedChild(int childMinX, int childMinY)
          Create a Raster with the same size, SampleModel and DataBuffer as this one, but with a different location.
static WritableRaster createWritableRaster(SampleModel sm, DataBuffer db, Point location)
          Creates a WritableRaster with the specified SampleModel and DataBuffer.
static WritableRaster createWritableRaster(SampleModel sm, Point location)
          Creates a WritableRaster with the specified SampleModel.
 Rectangle getBounds()
          Returns the bounding Rectangle of this Raster.
 DataBuffer getDataBuffer()
          Returns the DataBuffer associated with this Raster.
 Object getDataElements(int x, int y, int w, int h, Object outData)
          Returns the pixel data for the specified rectangle of pixels in a primitive array of type TransferType.
 Object getDataElements(int x, int y, Object outData)
          Returns data for a single pixel in a primitive array of type TransferType.
 int getHeight()
          Returns the height in pixels of the Raster.
 int getMinX()
          Returns the minimum valid X coordinate of the Raster.
 int getMinY()
          Returns the minimum valid Y coordinate of the Raster.
 int getNumBands()
          Returns the number of bands (samples per pixel) in this Raster.
 int getNumDataElements()
          Returns the number of data elements needed to transfer one pixel via the getDataElements and setDataElements methods.
 Raster getParent()
          Returns the parent Raster (if any) of this Raster or null.
 double[] getPixel(int x, int y, double[] dArray)
          Returns the samples in an array of double for the specified pixel.
 float[] getPixel(int x, int y, float[] fArray)
          Returns the samples in an array of float for the specified pixel.
 int[] getPixel(int x, int y, int[] iArray)
          Returns the samples in an array of int for the specified pixel.
 double[] getPixels(int x, int y, int w, int h, double[] dArray)
          Returns a double array containing all samples for a rectangle of pixels, one sample per array element.
 float[] getPixels(int x, int y, int w, int h, float[] fArray)
          Returns a float array containing all samples for a rectangle of pixels, one sample per array element.
 int[] getPixels(int x, int y, int w, int h, int[] iArray)
          Returns an int array containing all samples for a rectangle of pixels, one sample per array element.
 int getSample(int x, int y, int b)
          Returns the sample in a specified band for the pixel located at (x,y) as an int.
 double getSampleDouble(int x, int y, int b)
          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)
          Returns the sample in a specified band for the pixel located at (x,y) as a float.
 SampleModel getSampleModel()
          Returns the SampleModel that describes the layout of the image data.
 int getSampleModelTranslateX()
          Returns the X translation from the coordinate system of the SampleModel to that of the Raster.
 int getSampleModelTranslateY()
          Returns the Y translation from the coordinate system of the SampleModel to that of the Raster.
 double[] getSamples(int x, int y, int w, int h, int b, double[] dArray)
          Returns the samples for a specified band for a specified rectangle of pixels in a double array, one sample per array element.
 float[] getSamples(int x, int y, int w, int h, int b, float[] fArray)
          Returns the samples for a specified band for the specified rectangle of pixels in a float array, one sample per array element.
 int[] getSamples(int x, int y, int w, int h, int b, int[] iArray)
          Returns the samples for a specified band for the specified rectangle of pixels in an int array, one sample per array element.
 int getTransferType()
          Returns the TransferType used to transfer pixels via the getDataElements and setDataElements methods.
 int getWidth()
          Returns the width in pixels of the Raster.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

sampleModel

protected SampleModel sampleModel
The SampleModel that describes how pixels from this Raster are stored in the DataBuffer.


dataBuffer

protected DataBuffer dataBuffer
The DataBuffer that stores the image data.


minX

protected int minX
The X coordinate of the upper-left pixel of this Raster.


minY

protected int minY
The Y coordinate of the upper-left pixel of this Raster.


width

protected int width
The width of this Raster.


height

protected int height
The height of this Raster.


sampleModelTranslateX

protected int sampleModelTranslateX
The X translation from the coordinate space of the Raster's SampleModel to that of the Raster.


sampleModelTranslateY

protected int sampleModelTranslateY
The Y translation from the coordinate space of the Raster's SampleModel to that of the Raster.


numBands

protected int numBands
The number of bands in the Raster.


numDataElements

protected int numDataElements
The number of DataBuffer data elements per pixel.


parent

protected Raster parent
The parent of this Raster, or null.

Constructor Detail

Raster

protected Raster(SampleModel sampleModel,
                 Point origin)
Constructs a Raster with the given SampleModel. The Raster's upper left corner is origin and it is the same size as the SampleModel. A DataBuffer large enough to describe the Raster is automatically created.

Parameters:
sampleModel - The SampleModel that specifies the layout
origin - The Point that specified the origin
Throws:
RasterFormatException - if computing either origin.x + sampleModel.getWidth() or origin.y + sampleModel.getHeight() results in integer overflow
NullPointerException - either sampleModel or origin is null

Raster

protected Raster(SampleModel sampleModel,
                 DataBuffer dataBuffer,
                 Point origin)
Constructs a Raster with the given SampleModel and DataBuffer. The Raster's upper left corner is origin and it is the same size as the SampleModel. The DataBuffer is not initialized and must be compatible with SampleModel.

Parameters:
sampleModel - The SampleModel that specifies the layout
dataBuffer - The DataBuffer that contains the image data
origin - The Point that specifies the origin
Throws:
RasterFormatException - if computing either origin.x + sampleModel.getWidth() or origin.y + sampleModel.getHeight() results in integer overflow
NullPointerException - either sampleModel or origin is null

Raster

protected Raster(SampleModel sampleModel,
                 DataBuffer dataBuffer,
                 Rectangle aRegion,
                 Point sampleModelTranslate,
                 Raster parent)
Constructs a Raster with the given SampleModel, DataBuffer, and parent. aRegion specifies the bounding rectangle of the new Raster. When translated into the base Raster's coordinate system, aRegion must be contained by the base Raster. (The base Raster is the Raster's ancestor which has no parent.) sampleModelTranslate specifies the sampleModelTranslateX and sampleModelTranslateY values of the new Raster. Note that this constructor should generally be called by other constructors or create methods, it should not be used directly.

Parameters:
sampleModel - The SampleModel that specifies the layout
dataBuffer - The DataBuffer that contains the image data
aRegion - The Rectangle that specifies the image area
sampleModelTranslate - The Point that specifies the translation from SampleModel to Raster coordinates
parent - The parent (if any) of this raster
Throws:
NullPointerException - if any of sampleModel, dataBuffer, aRegion or sampleModelTranslate is null
RasterFormatException - if aRegion has width or height less than or equal to zero, or computing either aRegion.x + aRegion.width or aRegion.y + aRegion.height results in integer overflow
Method Detail

createInterleavedRaster

public static WritableRaster createInterleavedRaster(int dataType,
                                                     int w,
                                                     int h,
                                                     int bands,
                                                     Point location)
Creates a Raster based on a PixelInterleavedSampleModel with the specified data type, width, height, and number of bands.

The upper left corner of the Raster is given by the location argument. If location is null, (0, 0) will be used. The dataType parameter should be one of the enumerated values defined in the DataBuffer class.

Note that interleaved DataBuffer.TYPE_INT Rasters are not supported. To create a 1-band Raster of type DataBuffer.TYPE_INT, use Raster.createPackedRaster().

The only dataTypes supported currently are TYPE_BYTE and TYPE_USHORT.

Parameters:
dataType - the data type for storing samples
w - the width in pixels of the image data
h - the height in pixels of the image data
bands - the number of bands
location - the upper-left corner of the Raster
Returns:
a WritableRaster object with the specified data type, width, height and number of bands.
Throws:
RasterFormatException - if w or h is less than or equal to zero, or computing either location.x + w or location.y + h results in integer overflow

createInterleavedRaster

public static WritableRaster createInterleavedRaster(int dataType,
                                                     int w,
                                                     int h,
                                                     int scanlineStride,
                                                     int pixelStride,
                                                     int[] bandOffsets,
                                                     Point location)
Creates a Raster based on a PixelInterleavedSampleModel with the specified data type, width, height, scanline stride, pixel stride, and band offsets. The number of bands is inferred from bandOffsets.length.

The upper left corner of the Raster is given by the location argument. If location is null, (0, 0) will be used. The dataType parameter should be one of the enumerated values defined in the DataBuffer class.

Note that interleaved DataBuffer.TYPE_INT Rasters are not supported. To create a 1-band Raster of type DataBuffer.TYPE_INT, use Raster.createPackedRaster().

The only dataTypes supported currently are TYPE_BYTE and TYPE_USHORT.

Parameters:
dataType - the data type for storing samples
w - the width in pixels of the image data
h - the height in pixels of the image data
scanlineStride - the line stride of the image data
pixelStride - the pixel stride of the image data
bandOffsets - the offsets of all bands
location - the upper-left corner of the Raster
Returns:
a WritableRaster object with the specified data type, width, height, scanline stride, pixel stride and band offsets.
Throws:
RasterFormatException - if w or h is less than or equal to zero, or computing either location.x + w or location.y + h results in integer overflow
IllegalArgumentException - if dataType is not one of the supported data types, which are DataBuffer.TYPE_BYTE, or DataBuffer.TYPE_USHORT.

createBandedRaster

public static WritableRaster createBandedRaster(int dataType,
                                                int w,
                                                int h,
                                                int bands,
                                                Point location)
Creates a Raster based on a BandedSampleModel with the specified data type, width, height, and number of bands.

The upper left corner of the Raster is given by the location argument. If location is null, (0, 0) will be used. The dataType parameter should be one of the enumerated values defined in the DataBuffer class.

The only dataTypes supported currently are TYPE_BYTE, TYPE_USHORT, and TYPE_INT.

Parameters:
dataType - the data type for storing samples
w - the width in pixels of the image data
h - the height in pixels of the image data
bands - the number of bands
location - the upper-left corner of the Raster
Returns:
a WritableRaster object with the specified data type, width, height and number of bands.
Throws:
RasterFormatException - if w or h is less than or equal to zero, or computing either location.x + w or location.y + h results in integer overflow
ArrayIndexOutOfBoundsException - if bands is less than 1

createBandedRaster

public static WritableRaster createBandedRaster(int dataType,
                                                int w,
                                                int h,
                                                int scanlineStride,
                                                int[] bankIndices,
                                                int[] bandOffsets,
                                                Point location)
Creates a Raster based on a BandedSampleModel with the specified data type, width, height, scanline stride, bank indices and band offsets. The number of bands is inferred from bankIndices.length and bandOffsets.length, which must be the same.

The upper left corner of the Raster is given by the location argument. The dataType parameter should be one of the enumerated values defined in the DataBuffer class.

The only dataTypes supported currently are TYPE_BYTE, TYPE_USHORT, and TYPE_INT.

Parameters:
dataType - the data type for storing samples
w - the width in pixels of the image data
h - the height in pixels of the image data
scanlineStride - the line stride of the image data
bankIndices - the bank indices for each band
bandOffsets - the offsets of all bands
location - the upper-left corner of the Raster
Returns:
a WritableRaster object with the specified data type, width, height, scanline stride, bank indices and band offsets.
Throws:
RasterFormatException - if w or h is less than or equal to zero, or computing either location.x + w or location.y + h results in integer overflow
IllegalArgumentException - if dataType is not one of the supported data types, which are DataBuffer.TYPE_BYTE, DataBuffer.TYPE_USHORT or DataBuffer.TYPE_INT
ArrayIndexOutOfBoundsException - if bankIndices or bandOffsets is null

createPackedRaster

public static WritableRaster createPackedRaster(int dataType,
                                                int w,
                                                int h,
                                                int[] bandMasks,
                                                Point location)
Creates a Raster based on a SinglePixelPackedSampleModel with the specified data type, width, height, and band masks. The number of bands is inferred from bandMasks.length.

The upper left corner of the Raster is given by the location argument. If location is null, (0, 0) will be used. The dataType parameter should be one of the enumerated values defined in the DataBuffer class.

The only dataTypes supported currently are TYPE_BYTE, TYPE_USHORT, and TYPE_INT.

Parameters:
dataType - the data type for storing samples
w - the width in pixels of the image data
h - the height in pixels of the image data
bandMasks - an array containing an entry for each band
location - the upper-left corner of the Raster
Returns:
a WritableRaster object with the specified data type, width, height, and band masks.
Throws:
RasterFormatException - if w or h is less than or equal to zero, or computing either location.x + w or location.y + h results in integer overflow
IllegalArgumentException - if dataType is not one of the supported data types, which are DataBuffer.TYPE_BYTE, DataBuffer.TYPE_USHORT or DataBuffer.TYPE_INT

createPackedRaster

public static WritableRaster createPackedRaster(int dataType,
                                                int w,
                                                int h,
                                                int bands,
                                                int bitsPerBand,
                                                Point location)
Creates a Raster based on a packed SampleModel with the specified data type, width, height, number of bands, and bits per band. If the number of bands is one, the SampleModel will be a MultiPixelPackedSampleModel.

If the number of bands is more than one, the SampleModel will be a SinglePixelPackedSampleModel, with each band having bitsPerBand bits. In either case, the requirements on dataType and bitsPerBand imposed by the corresponding SampleModel must be met.

The upper left corner of the Raster is given by the location argument. If location is null, (0, 0) will be used. The dataType parameter should be one of the enumerated values defined in the DataBuffer class.

The only dataTypes supported currently are TYPE_BYTE, TYPE_USHORT, and TYPE_INT.

Parameters:
dataType - the data type for storing samples
w - the width in pixels of the image data
h - the height in pixels of the image data
bands - the number of bands
bitsPerBand - the number of bits per band
location - the upper-left corner of the Raster
Returns:
a WritableRaster object with the specified data type, width, height, number of bands, and bits per band.
Throws:
RasterFormatException - if w or h is less than or equal to zero, or computing either location.x + w or location.y + h results in integer overflow
IllegalArgumentException - if the product of bitsPerBand and bands is greater than the number of bits held by dataType
IllegalArgumentException - if bitsPerBand or bands is not greater than zero
IllegalArgumentException - if dataType is not one of the supported data types, which are DataBuffer.TYPE_BYTE, DataBuffer.TYPE_USHORT or DataBuffer.TYPE_INT

createInterleavedRaster

public static WritableRaster createInterleavedRaster(DataBuffer dataBuffer,
                                                     int w,
                                                     int h,
                                                     int scanlineStride,
                                                     int pixelStride,
                                                     int[] bandOffsets,
                                                     Point location)
Creates a Raster based on a PixelInterleavedSampleModel with the specified DataBuffer, width, height, scanline stride, pixel stride, and band offsets. The number of bands is inferred from bandOffsets.length. The upper left corner of the Raster is given by the location argument. If location is null, (0, 0) will be used.

Note that interleaved DataBuffer.TYPE_INT Rasters are not supported. To create a 1-band Raster of type DataBuffer.TYPE_INT, use Raster.createPackedRaster().

Parameters:
dataBuffer - the DataBuffer that contains the image data
w - the width in pixels of the image data
h - the height in pixels of the image data
scanlineStride - the line stride of the image data
pixelStride - the pixel stride of the image data
bandOffsets - the offsets of all bands
location - the upper-left corner of the Raster
Returns:
a WritableRaster object with the specified DataBuffer, width, height, scanline stride, pixel stride and band offsets.
Throws:
RasterFormatException - if w or h is less than or equal to zero, or computing either location.x + w or location.y + h results in integer overflow
IllegalArgumentException - if dataType is not one of the supported data types, which are DataBuffer.TYPE_BYTE, DataBuffer.TYPE_USHORT
RasterFormatException - if dataBuffer has more than one bank.
NullPointerException - if dataBuffer is null

createBandedRaster

public static WritableRaster createBandedRaster(DataBuffer dataBuffer,
                                                int w,
                                                int h,
                                                int scanlineStride,
                                                int[] bankIndices,
                                                int[] bandOffsets,
                                                Point location)
Creates a Raster based on a BandedSampleModel with the specified DataBuffer, width, height, scanline stride, bank indices, and band offsets. The number of bands is inferred from bankIndices.length and bandOffsets.length, which must be the same. The upper left corner of the Raster is given by the location argument. If location is null, (0, 0) will be used.

Parameters:
dataBuffer - the DataBuffer that contains the image data
w - the width in pixels of the image data
h - the height in pixels of the image data
scanlineStride - the line stride of the image data
bankIndices - the bank indices for each band
bandOffsets - the offsets of all bands
location - the upper-left corner of the Raster
Returns:
a WritableRaster object with the specified DataBuffer, width, height, scanline stride, bank indices and band offsets.
Throws:
RasterFormatException - if w or h is less than or equal to zero, or computing either location.x + w or location.y + h results in integer overflow
IllegalArgumentException - if dataType is not one of the supported data types, which are DataBuffer.TYPE_BYTE, DataBuffer.TYPE_USHORT or DataBuffer.TYPE_INT
NullPointerException - if dataBuffer is null

createPackedRaster

public static WritableRaster createPackedRaster(DataBuffer dataBuffer,
                                                int w,
                                                int h,
                                                int scanlineStride,
                                                int[] bandMasks,
                                                Point location)
Creates a Raster based on a SinglePixelPackedSampleModel with the specified DataBuffer, width, height, scanline stride, and band masks. The number of bands is inferred from bandMasks.length. The upper left corner of the Raster is given by the location argument. If location is null, (0, 0) will be used.

Parameters:
dataBuffer - the DataBuffer that contains the image data
w - the width in pixels of the image data
h - the height in pixels of the image data
scanlineStride - the line stride of the image data
bandMasks - an array containing an entry for each band
location - the upper-left corner of the Raster
Returns:
a WritableRaster object with the specified DataBuffer, width, height, scanline stride, and band masks.
Throws:
RasterFormatException - if w or h is less than or equal to zero, or computing either location.x + w or location.y + h results in integer overflow
IllegalArgumentException - if dataType is not one of the supported data types, which are DataBuffer.TYPE_BYTE, DataBuffer.TYPE_USHORT or DataBuffer.TYPE_INT
RasterFormatException - if dataBuffer has more than one bank.
NullPointerException - if dataBuffer is null

createPackedRaster

public static WritableRaster createPackedRaster(DataBuffer dataBuffer,
                                                int w,
                                                int h,
                                                int bitsPerPixel,
                                                Point location)
Creates a Raster based on a MultiPixelPackedSampleModel with the specified DataBuffer, width, height, and bits per pixel. The upper left corner of the Raster is given by the location argument. If location is null, (0, 0) will be used.

Parameters:
dataBuffer - the DataBuffer that contains the image data
w - the width in pixels of the image data
h - the height in pixels of the image data
bitsPerPixel - the number of bits for each pixel
location - the upper-left corner of the Raster
Returns:
a WritableRaster object with the specified DataBuffer, width, height, and bits per pixel.
Throws:
RasterFormatException - if w or h is less than or equal to zero, or computing either location.x + w or location.y + h results in integer overflow
IllegalArgumentException - if dataType is not one of the supported data types, which are DataBuffer.TYPE_BYTE, DataBuffer.TYPE_USHORT or DataBuffer.TYPE_INT
RasterFormatException - if dataBuffer has more than one bank.
NullPointerException - if dataBuffer is null

createRaster

public static Raster createRaster(SampleModel sm,
                                  DataBuffer db,
                                  Point location)
Creates a Raster with the specified SampleModel and DataBuffer. The upper left corner of the Raster is given by the location argument. If location is null, (0, 0) will be used.

Parameters:
sm - the specified SampleModel
db - the specified DataBuffer
location - the upper-left corner of the Raster
Returns:
a Raster with the specified SampleModel, DataBuffer, and location.
Throws:
RasterFormatException - if computing either location.x + sm.getWidth() or location.y + sm.getHeight() results in integer overflow
RasterFormatException - if dataBuffer has more than one bank and the sampleModel is PixelInterleavedSampleModel, SinglePixelPackedSampleModel, or MultiPixelPackedSampleModel.
NullPointerException - if either SampleModel or DataBuffer is null

createWritableRaster

public static WritableRaster createWritableRaster(SampleModel sm,
                                                  Point location)
Creates a WritableRaster with the specified SampleModel. The upper left corner of the Raster is given by the location argument. If location is null, (0, 0) will be used.

Parameters:
sm - the specified SampleModel
location - the upper-left corner of the WritableRaster
Returns:
a WritableRaster with the specified SampleModel and location.
Throws:
RasterFormatException - if computing either location.x + sm.getWidth() or location.y + sm.getHeight() results in integer overflow

createWritableRaster

public static WritableRaster createWritableRaster(SampleModel sm,
                                                  DataBuffer db,
                                                  Point location)
Creates a WritableRaster with the specified SampleModel and DataBuffer. The upper left corner of the Raster is given by the location argument. If location is null, (0, 0) will be used.

Parameters:
sm - the specified SampleModel
db - the specified DataBuffer
location - the upper-left corner of the WritableRaster
Returns:
a WritableRaster with the specified SampleModel, DataBuffer, and location.
Throws:
RasterFormatException - if computing either location.x + sm.getWidth() or location.y + sm.getHeight() results in integer overflow
RasterFormatException - if dataBuffer has more than one bank and the sampleModel is PixelInterleavedSampleModel, SinglePixelPackedSampleModel, or MultiPixelPackedSampleModel.
NullPointerException - if either SampleModel or DataBuffer is null

getParent

public Raster getParent()
Returns the parent Raster (if any) of this Raster or null.

Returns:
the parent Raster or null.

getSampleModelTranslateX

public final int getSampleModelTranslateX()
Returns the X translation from the coordinate system of the SampleModel to that of the Raster. To convert a pixel's X coordinate from the Raster coordinate system to the SampleModel coordinate system, this value must be subtracted.

Returns:
the X translation from the coordinate space of the Raster's SampleModel to that of the Raster.

getSampleModelTranslateY

public final int getSampleModelTranslateY()
Returns the Y translation from the coordinate system of the SampleModel to that of the Raster. To convert a pixel's Y coordinate from the Raster coordinate system to the SampleModel coordinate system, this value must be subtracted.

Returns:
the Y translation from the coordinate space of the Raster's SampleModel to that of the Raster.

createCompatibleWritableRaster

public WritableRaster createCompatibleWritableRaster()
Create a compatible WritableRaster the same size as this Raster with the same SampleModel and a new initialized DataBuffer.

Returns:
a compatible WritableRaster with the same sample model and a new data buffer.

createCompatibleWritableRaster

public WritableRaster createCompatibleWritableRaster(int w,
                                                     int h)
Create a compatible WritableRaster with the specified size, a new SampleModel, and a new initialized DataBuffer.

Parameters:
w - the specified width of the new WritableRaster
h - the specified height of the new WritableRaster
Returns:
a compatible WritableRaster with the specified size and a new sample model and data buffer.
Throws:
RasterFormatException - if the width or height is less than or equal to zero.

createCompatibleWritableRaster

public WritableRaster createCompatibleWritableRaster(Rectangle rect)
Create a compatible WritableRaster with location (minX, minY) and size (width, height) specified by rect, a new SampleModel, and a new initialized DataBuffer.

Parameters:
rect - a Rectangle that specifies the size and location of the WritableRaster
Returns:
a compatible WritableRaster with the specified size and location and a new sample model and data buffer.
Throws:
RasterFormatException - if rect has width or height less than or equal to zero, or computing either rect.x + rect.width or rect.y + rect.height results in integer overflow
NullPointerException - if rect is null

createCompatibleWritableRaster

public WritableRaster createCompatibleWritableRaster(int x,
                                                     int y,
                                                     int w,
                                                     int h)
Create a compatible WritableRaster with the specified location (minX, minY) and size (width, height), a new SampleModel, and a new initialized DataBuffer.

Parameters:
x - the X coordinate of the upper-left corner of the WritableRaster
y - the Y coordinate of the upper-left corner of the WritableRaster
w - the specified width of the WritableRaster
h - the specified height of the WritableRaster
Returns:
a compatible WritableRaster with the specified size and location and a new sample model and data buffer.
Throws:
RasterFormatException - if w or h is less than or equal to zero, or computing either x + w or y + h results in integer overflow

createTranslatedChild

public Raster createTranslatedChild(int childMinX,
                                    int childMinY)
Create a Raster with the same size, SampleModel and DataBuffer as this one, but with a different location. The new Raster will possess a reference to the current Raster, accessible through its getParent() method.

Parameters:
childMinX - the X coordinate of the upper-left corner of the new Raster
childMinY - the Y coordinate of the upper-left corner of the new Raster
Returns:
a new Raster with the same size, SampleModel, and DataBuffer as this Raster, but with the specified location.
Throws:
RasterFormatException - if computing either childMinX + this.getWidth() or childMinY + this.getHeight() results in integer overflow

createChild

public Raster createChild(int parentX,
                          int parentY,
                          int width,
                          int height,
                          int childMinX,
                          int childMinY,
                          int[] bandList)
Returns a new Raster which shares all or part of this Raster's DataBuffer. The new Raster will possess a reference to the current Raster, accessible through its getParent() method.

The parentX, parentY, width and height parameters form a Rectangle in this Raster's coordinate space, indicating the area of pixels to be shared. An error will be thrown if this Rectangle is not contained with the bounds of the current Raster.

The new Raster may additionally be translated to a different coordinate system for the plane than that used by the current Raster. The childMinX and childMinY parameters give the new (x, y) coordinate of the upper-left pixel of the returned Raster; the coordinate (childMinX, childMinY) in the new Raster will map to the same pixel as the coordinate (parentX, parentY) in the current Raster.

The new Raster may be defined to contain only a subset of the bands of the current Raster, possibly reordered, by means of the bandList parameter. If bandList is null, it is taken to include all of the bands of the current Raster in their current order.

To create a new Raster that contains a subregion of the current Raster, but shares its coordinate system and bands, this method should be called with childMinX equal to parentX, childMinY equal to parentY, and bandList equal to null.

Parameters:
parentX - The X coordinate of the upper-left corner in this Raster's coordinates
parentY - The Y coordinate of the upper-left corner in this Raster's coordinates
width - Width of the region starting at (parentX, parentY)
height - Height of the region starting at (parentX, parentY).
childMinX - The X coordinate of the upper-left corner of the returned Raster
childMinY - The Y coordinate of the upper-left corner of the returned Raster
bandList - Array of band indices, or null to use all bands
Returns:
a new Raster.
Throws:
RasterFormatException - if the specified subregion is outside of the raster bounds.
RasterFormatException - if width or height is less than or equal to zero, or computing any of parentX + width, parentY + height, childMinX + width, or childMinY + height results in integer overflow

getBounds

public Rectangle getBounds()
Returns the bounding Rectangle of this Raster. This function returns the same information as getMinX/MinY/Width/Height.

Returns:
the bounding box of this Raster.

getMinX

public final int getMinX()
Returns the minimum valid X coordinate of the Raster.

Returns:
the minimum x coordinate of this Raster.

getMinY

public final int getMinY()
Returns the minimum valid Y coordinate of the Raster.

Returns:
the minimum y coordinate of this Raster.

getWidth

public final int getWidth()
Returns the width in pixels of the Raster.

Returns:
the width of this Raster.

getHeight

public final int getHeight()
Returns the height in pixels of the Raster.

Returns:
the height of this Raster.

getNumBands

public final int getNumBands()
Returns the number of bands (samples per pixel) in this Raster.

Returns:
the number of bands of this Raster.

getNumDataElements

public final int getNumDataElements()
Returns the number of data elements needed to transfer one pixel via the getDataElements and setDataElements methods. When pixels are transferred via these methods, they may be transferred in a packed or unpacked format, depending on the implementation of the underlying SampleModel. Using these methods, pixels are transferred as an array of getNumDataElements() elements of a primitive type given by getTransferType(). The TransferType may or may not be the same as the storage data type of the DataBuffer.

Returns:
the number of data elements.

getTransferType

public final int getTransferType()
Returns the TransferType used to transfer pixels via the getDataElements and setDataElements methods. When pixels are transferred via these methods, they may be transferred in a packed or unpacked format, depending on the implementation of the underlying SampleModel. Using these methods, pixels are transferred as an array of getNumDataElements() elements of a primitive type given by getTransferType(). The TransferType may or may not be the same as the storage data type of the DataBuffer. The TransferType will be one of the types defined in DataBuffer.

Returns:
this transfer type.

getDataBuffer

public DataBuffer getDataBuffer()
Returns the DataBuffer associated with this Raster.

Returns:
the DataBuffer of this Raster.

getSampleModel

public SampleModel getSampleModel()
Returns the SampleModel that describes the layout of the image data.

Returns:
the SampleModel of this Raster.

getDataElements

public Object getDataElements(int x,
                              int y,
                              Object outData)
Returns data for a single pixel in a primitive array of type TransferType. For image data supported by the Java 2D(tm) API, this will be one of DataBuffer.TYPE_BYTE, DataBuffer.TYPE_USHORT, DataBuffer.TYPE_INT, DataBuffer.TYPE_SHORT, DataBuffer.TYPE_FLOAT, or DataBuffer.TYPE_DOUBLE. Data may be returned in a packed format, thus increasing efficiency for data transfers. An ArrayIndexOutOfBoundsException may be thrown if the coordinates are not in bounds. However, explicit bounds checking is not guaranteed. A ClassCastException will be thrown if the input object is non null and references anything other than an array of TransferType.

Parameters:
x - The X coordinate of the pixel location
y - The Y coordinate of the pixel location
outData - An object reference to an array of type defined by getTransferType() and length getNumDataElements(). If null, an array of appropriate type and size will be allocated
Returns:
An object reference to an array of type defined by getTransferType() with the requested pixel data.
Throws:
ArrayIndexOutOfBoundsException - if the coordinates are not in bounds, or if outData is too small to hold the output.
See Also:
SampleModel.getDataElements(int, int, Object, DataBuffer)

getDataElements

public Object getDataElements(int x,
                              int y,
                              int w,
                              int h,
                              Object outData)
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 DataBuffer.TYPE_BYTE, DataBuffer.TYPE_USHORT, DataBuffer.TYPE_INT, DataBuffer.TYPE_SHORT, DataBuffer.TYPE_FLOAT, or DataBuffer.TYPE_DOUBLE. Data may be returned in a packed format, thus increasing efficiency for data transfers. An ArrayIndexOutOfBoundsException may be thrown if the coordinates are not in bounds. However, explicit bounds checking is not guaranteed. A ClassCastException will be thrown if the input object is non null and references anything other than an array of TransferType.

Parameters:
x - The X coordinate of the upper-left pixel location
y - The Y coordinate of the upper-left pixel location
w - Width of the pixel rectangle
h - Height of the pixel rectangle
outData - An object reference to an array of type defined by getTransferType() and length w*h*getNumDataElements(). If null, an array of appropriate type and size will be allocated.
Returns:
An object reference to an array of type defined by getTransferType() with the requested pixel data.
Throws:
ArrayIndexOutOfBoundsException - if the coordinates are not in bounds, or if outData is too small to hold the output.
See Also:
SampleModel.getDataElements(int, int, int, int, Object, DataBuffer)

getPixel

public int[] getPixel(int x,
                      int y,
                      int[] iArray)
Returns the samples in an array of int for the specified pixel. An ArrayIndexOutOfBoundsException may be thrown if the coordinates are not in bounds. However, explicit bounds checking is not guaranteed.

Parameters:
x - The X coordinate of the pixel location
y - The Y coordinate of the pixel location
iArray - An optionally preallocated int array
Returns:
the samples for the specified pixel.
Throws:
ArrayIndexOutOfBoundsException - if the coordinates are not in bounds, or if iArray is too small to hold the output.

getPixel

public float[] getPixel(int x,
                        int y,
                        float[] fArray)
Returns the samples in an array of float for the specified pixel. An ArrayIndexOutOfBoundsException may be thrown if the coordinates are not in bounds. However, explicit bounds checking is not guaranteed.

Parameters:
x - The X coordinate of the pixel location
y - The Y coordinate of the pixel location
fArray - An optionally preallocated float array
Returns:
the samples for the specified pixel.
Throws:
ArrayIndexOutOfBoundsException - if the coordinates are not in bounds, or if fArray is too small to hold the output.

getPixel

public double[] getPixel(int x,
                         int y,
                         double[] dArray)
Returns the samples in an array of double for the specified pixel. An ArrayIndexOutOfBoundsException may be thrown if the coordinates are not in bounds. However, explicit bounds checking is not guaranteed.

Parameters:
x - The X coordinate of the pixel location
y - The Y coordinate of the pixel location
dArray - An optionally preallocated double array
Returns:
the samples for the specified pixel.
Throws:
ArrayIndexOutOfBoundsException - if the coordinates are not in bounds, or if dArray is too small to hold the output.

getPixels

public int[] getPixels(int x,
                       int y,
                       int w,
                       int h,
                       int[] iArray)
Returns an int array containing all samples for a rectangle of pixels, one sample per array element. An ArrayIndexOutOfBoundsException may be thrown if the coordinates are not in bounds. However, explicit bounds checking is not guaranteed.

Parameters:
x - The X coordinate of the upper-left pixel location
y - The Y coordinate of the upper-left pixel location
w - Width of the pixel rectangle
h - Height of the pixel rectangle
iArray - An optionally pre-allocated int array
Returns:
the samples for the specified rectangle of pixels.
Throws:
ArrayIndexOutOfBoundsException - if the coordinates are not in bounds, or if iArray is too small to hold the output.

getPixels

public float[] getPixels(int x,
                         int y,
                         int w,
                         int h,
                         float[] fArray)
Returns a float array containing all samples for a rectangle of pixels, one sample per array element. An ArrayIndexOutOfBoundsException may be thrown if the coordinates are not in bounds. However, explicit bounds checking is not guaranteed.

Parameters:
x - The X coordinate of the pixel location
y - The Y coordinate of the pixel location
w - Width of the pixel rectangle
h - Height of the pixel rectangle
fArray - An optionally pre-allocated float array
Returns:
the samples for the specified rectangle of pixels.
Throws:
ArrayIndexOutOfBoundsException - if the coordinates are not in bounds, or if fArray is too small to hold the output.

getPixels

public double[] getPixels(int x,
                          int y,
                          int w,
                          int h,
                          double[] dArray)
Returns a double array containing all samples for a rectangle of pixels, one sample per array element. An ArrayIndexOutOfBoundsException may be thrown if the coordinates are not in bounds. However, explicit bounds checking is not guaranteed.

Parameters:
x - The X coordinate of the upper-left pixel location
y - The Y coordinate of the upper-left pixel location
w - Width of the pixel rectangle
h - Height of the pixel rectangle
dArray - An optionally pre-allocated double array
Returns:
the samples for the specified rectangle of pixels.
Throws:
ArrayIndexOutOfBoundsException - if the coordinates are not in bounds, or if dArray is too small to hold the output.

getSample

public int getSample(int x,
                     int y,
                     int b)
Returns the sample in a specified band for the pixel located at (x,y) as an int. An ArrayIndexOutOfBoundsException may be thrown if the coordinates are not in bounds. However, explicit bounds checking is not guaranteed.

Parameters:
x - The X coordinate of the pixel location
y - The Y coordinate of the pixel location
b - The band to return
Returns:
the sample in the specified band for the pixel at the specified coordinate.
Throws:
ArrayIndexOutOfBoundsException - if the coordinates or the band index are not in bounds.

getSampleFloat

public float getSampleFloat(int x,
                            int y,
                            int b)
Returns the sample in a specified band for the pixel located at (x,y) as a float. An ArrayIndexOutOfBoundsException may be thrown if the coordinates are not in bounds. However, explicit bounds checking is not guaranteed.

Parameters:
x - The X coordinate of the pixel location
y - The Y coordinate of the pixel location
b - The band to return
Returns:
the sample in the specified band for the pixel at the specified coordinate.
Throws:
ArrayIndexOutOfBoundsException - if the coordinates or the band index are not in bounds.

getSampleDouble

public double getSampleDouble(int x,
                              int y,
                              int b)
Returns the sample in a specified band for a pixel located at (x,y) as a double. An ArrayIndexOutOfBoundsException may be thrown if the coordinates are not in bounds. However, explicit bounds checking is not guaranteed.

Parameters:
x - The X coordinate of the pixel location
y - The Y coordinate of the pixel location
b - The band to return
Returns:
the sample in the specified band for the pixel at the specified coordinate.
Throws:
ArrayIndexOutOfBoundsException - if the coordinates or the band index are not in bounds.

getSamples

public int[] getSamples(int x,
                        int y,
                        int w,
                        int h,
                        int b,
                        int[] iArray)
Returns the samples for a specified band for the specified rectangle of pixels in an int array, one sample per array element. An ArrayIndexOutOfBoundsException may be thrown if the coordinates are not in bounds. However, explicit bounds checking is not guaranteed.

Parameters:
x - The X coordinate of the upper-left pixel location
y - The Y coordinate of the upper-left pixel location
w - Width of the pixel rectangle
h - Height of the pixel rectangle
b - The band to return
iArray - An optionally pre-allocated int array
Returns:
the samples for the specified band for the specified rectangle of pixels.
Throws:
ArrayIndexOutOfBoundsException - if the coordinates or the band index are not in bounds, or if iArray is too small to hold the output.

getSamples

public float[] getSamples(int x,
                          int y,
                          int w,
                          int h,
                          int b,
                          float[] fArray)
Returns the samples for a specified band for the specified rectangle of pixels in a float array, one sample per array element. An ArrayIndexOutOfBoundsException may be thrown if the coordinates are not in bounds. However, explicit bounds checking is not guaranteed.

Parameters:
x - The X coordinate of the upper-left pixel location
y - The Y coordinate of the upper-left pixel location
w - Width of the pixel rectangle
h - Height of the pixel rectangle
b - The band to return
fArray - An optionally pre-allocated float array
Returns:
the samples for the specified band for the specified rectangle of pixels.
Throws:
ArrayIndexOutOfBoundsException - if the coordinates or the band index are not in bounds, or if fArray is too small to hold the output.

getSamples

public double[] getSamples(int x,
                           int y,
                           int w,
                           int h,
                           int b,
                           double[] dArray)
Returns the samples for a specified band for a specified rectangle of pixels in a double array, one sample per array element. An ArrayIndexOutOfBoundsException may be thrown if the coordinates are not in bounds. However, explicit bounds checking is not guaranteed.

Parameters:
x - The X coordinate of the upper-left pixel location
y - The Y coordinate of the upper-left pixel location
w - Width of the pixel rectangle
h - Height of the pixel rectangle
b - The band to return
dArray - An optionally pre-allocated double array
Returns:
the samples for the specified band for the specified rectangle of pixels.
Throws:
ArrayIndexOutOfBoundsException - if the coordinates or the band index are not in bounds, or if dArray is too small to hold the output.

Java™ Platform
Standard Ed. 6

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