Class SinglePixelPackedSampleModel
- java.lang.Object
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- java.awt.image.SampleModel
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- java.awt.image.SinglePixelPackedSampleModel
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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 supportsTYPE_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 pixelx,y
from DataBufferdata
:int sample = data.getElem(y * scanlineStride + x); sample = (sample & bitMasks[b]) >>> bitOffsets[b];
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Field Summary
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Fields inherited from class java.awt.image.SampleModel
dataType, height, numBands, width
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Constructor Summary
Constructors Constructor and Description 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.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method and Description SampleModel
createCompatibleSampleModel(int w, int h)
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.boolean
equals(Object o)
Indicates whether some other object is "equal to" this one.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.int
hashCode()
Returns a hash code value for the object.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
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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. Bit masks exceeding data type capacity are truncated.- Parameters:
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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:
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IllegalArgumentException
- ifdataType
is not eitherDataBuffer.TYPE_BYTE
,DataBuffer.TYPE_USHORT
, orDataBuffer.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. Bit masks exceeding data type capacity are truncated.- Parameters:
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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:
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IllegalArgumentException
- ifw
orh
is not greater than 0 -
IllegalArgumentException
- if any mask inbitMask
is not contiguous -
IllegalArgumentException
- ifdataType
is not eitherDataBuffer.TYPE_BYTE
,DataBuffer.TYPE_USHORT
, orDataBuffer.TYPE_INT
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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.- Specified by:
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getNumDataElements
in classSampleModel
- Returns:
- the number of data elements.
- See Also:
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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)
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.- Specified by:
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createCompatibleSampleModel
in classSampleModel
- Parameters:
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w
- the width of the resultingSampleModel
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h
- the height of the resultingSampleModel
- Returns:
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a
SinglePixelPackedSampleModel
with the specified width and height. - Throws:
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IllegalArgumentException
- ifw
orh
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.- Specified by:
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createDataBuffer
in classSampleModel
- Returns:
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a
DataBuffer
corresponding to thisSampleModel
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getSampleSize
public int[] getSampleSize()
Returns the number of bits per sample for all bands.- Specified by:
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getSampleSize
in classSampleModel
- Returns:
- the size of samples for all bands.
getSampleSize
public int getSampleSize(int band)
Returns the number of bits per sample for the specified band.- Specified by:
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getSampleSize
in classSampleModel
- Parameters:
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band
- the specified band - Returns:
- the size of the samples of the specified band.
getOffset
public int getOffset(int x, int y)
Returns the offset (in data array elements) of pixel (x,y). The data element containing pixelx,y
can be retrieved from a DataBufferdata
with a SinglePixelPackedSampleModelsppsm
as:data.getElem(sppsm.getOffset(x, y));
- Parameters:
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x
- the X coordinate of the specified pixel -
y
- the Y coordinate of the specified pixel - Returns:
- the offset of the specified pixel.
getBitOffsets
public int[] getBitOffsets()
Returns the bit offsets into the data array element representing a pixel for all bands.- Returns:
- the bit offsets representing a pixel for all bands.
getBitMasks
public int[] getBitMasks()
Returns the bit masks for all bands.- Returns:
- the bit masks for all bands.
getScanlineStride
public int getScanlineStride()
Returns the scanline stride of this SinglePixelPackedSampleModel.- Returns:
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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.- Specified by:
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createSubsetSampleModel
in classSampleModel
- Parameters:
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bands
- the subset of bands of thisSampleModel
- Returns:
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a
SampleModel
with a subset of bands of thisSampleModel
. - Throws:
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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 SinglePixelPackedSampleModelsppsm1
, to DataBufferdb2
, whose storage layout is described by SinglePixelPackedSampleModelsppsm2
. 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.
- Specified by:
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getDataElements
in classSampleModel
- Parameters:
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x
- The X coordinate of the pixel location. -
y
- The Y coordinate of the pixel location. -
obj
- If non-null, a primitive array in which to return the pixel data. -
data
- The DataBuffer containing the image data. - Returns:
- the data for the specified pixel.
- See Also:
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setDataElements(int, int, Object, DataBuffer)
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:
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getPixel
in classSampleModel
- Parameters:
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x
- The X coordinate of the pixel location. -
y
- The Y coordinate of the pixel location. -
iArray
- If non-null, returns the samples in this array -
data
- The DataBuffer containing the image data. - Returns:
- all samples for the specified pixel.
- See Also:
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setPixel(int, int, int[], DataBuffer)
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:
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getPixels
in classSampleModel
- Parameters:
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x
- The X coordinate of the upper left pixel location. -
y
- The Y coordinate of the upper left pixel location. -
w
- The width of the pixel rectangle. -
h
- The height of the pixel rectangle. -
iArray
- If non-null, returns the samples in this array. -
data
- The DataBuffer containing the image data. - Returns:
- all samples for the specified region of pixels.
- See Also:
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setPixels(int, int, int, int, int[], DataBuffer)
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.- Specified by:
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getSample
in classSampleModel
- Parameters:
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x
- The X coordinate of the pixel location. -
y
- The Y coordinate of the pixel location. -
b
- The band to return. -
data
- The DataBuffer containing the image data. - Returns:
- the sample in a specified band for the specified pixel.
- See Also:
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setSample(int, int, int, int, DataBuffer)
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:
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getSamples
in classSampleModel
- Parameters:
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x
- The X coordinate of the upper left pixel location. -
y
- The Y coordinate of the upper left pixel location. -
w
- The width of the pixel rectangle. -
h
- The height of the pixel rectangle. -
b
- The band to return. -
iArray
- If non-null, returns the samples in this array. -
data
- The DataBuffer containing the image data. - Returns:
- the samples for the specified band for the specified region of pixels.
- See Also:
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setSamples(int, int, int, int, int, int[], DataBuffer)
setDataElements
public void setDataElements(int x, int y, Object obj, DataBuffer data)
Sets the data for a single pixel in the specified DataBuffer from a primitive array of type TransferType. For a 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 SinglePixelPackedSampleModelsppsm1
, to DataBufferdb2
, whose storage layout is described by SinglePixelPackedSampleModelsppsm2
. 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.
- Specified by:
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setDataElements
in classSampleModel
- Parameters:
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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. - See Also:
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getDataElements(int, int, Object, DataBuffer)
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:
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setPixel
in classSampleModel
- Parameters:
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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. - See Also:
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getPixel(int, int, int[], DataBuffer)
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:
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setPixels
in classSampleModel
- Parameters:
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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. - See Also:
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getPixels(int, int, int, int, int[], DataBuffer)
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.- Specified by:
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setSample
in classSampleModel
- Parameters:
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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. - See Also:
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getSample(int, int, int, DataBuffer)
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:
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setSamples
in classSampleModel
- Parameters:
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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. - See Also:
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getSamples(int, int, int, int, int, int[], DataBuffer)
equals
public boolean equals(Object o)
Description copied from class:Object
Indicates whether some other object is "equal to" this one.The
equals
method implements an equivalence relation on non-null object references:- It is reflexive: for any non-null reference value
x
,x.equals(x)
should returntrue
. - It is symmetric: for any non-null reference values
x
andy
,x.equals(y)
should returntrue
if and only ify.equals(x)
returnstrue
. - It is transitive: for any non-null reference values
x
,y
, andz
, ifx.equals(y)
returnstrue
andy.equals(z)
returnstrue
, thenx.equals(z)
should returntrue
. - It is consistent: for any non-null reference values
x
andy
, multiple invocations ofx.equals(y)
consistently returntrue
or consistently returnfalse
, provided no information used inequals
comparisons on the objects is modified. - For any non-null reference value
x
,x.equals(null)
should returnfalse
.
The
equals
method for classObject
implements the most discriminating possible equivalence relation on objects; that is, for any non-null reference valuesx
andy
, this method returnstrue
if and only ifx
andy
refer to the same object (x == y
has the valuetrue
).Note that it is generally necessary to override the
hashCode
method whenever this method is overridden, so as to maintain the general contract for thehashCode
method, which states that equal objects must have equal hash codes.- Overrides:
-
equals
in classObject
- Parameters:
-
o
- the reference object with which to compare. - Returns:
-
true
if this object is the same as the obj argument;false
otherwise. - See Also:
-
Object.hashCode()
,HashMap
- It is reflexive: for any non-null reference value
hashCode
public int hashCode()
Description copied from class:Object
Returns a hash code value for the object. This method is supported for the benefit of hash tables such as those provided byHashMap
.The general contract of
hashCode
is:- Whenever it is invoked on the same object more than once during an execution of a Java application, the
hashCode
method must consistently return the same integer, provided no information used inequals
comparisons on the object is modified. This integer need not remain consistent from one execution of an application to another execution of the same application. - If two objects are equal according to the
equals(Object)
method, then calling thehashCode
method on each of the two objects must produce the same integer result. - It is not required that if two objects are unequal according to the
Object.equals(java.lang.Object)
method, then calling thehashCode
method on each of the two objects must produce distinct integer results. However, the programmer should be aware that producing distinct integer results for unequal objects may improve the performance of hash tables.
As much as is reasonably practical, the hashCode method defined by class
Object
does return distinct integers for distinct objects. (This is typically implemented by converting the internal address of the object into an integer, but this implementation technique is not required by the Java™ programming language.)- Overrides:
-
hashCode
in classObject
- Returns:
- a hash code value for this object.
- See Also:
-
Object.equals(java.lang.Object)
,System.identityHashCode(java.lang.Object)
- Whenever it is invoked on the same object more than once during an execution of a Java application, the
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Submit a bug or feature
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