- All Implemented Interfaces:
Transparency
- Direct Known Subclasses:
ComponentColorModel
,IndexColorModel
,PackedColorModel
ColorModel
abstract class encapsulates the
methods for translating a pixel value to color components
(for example, red, green, and blue) and an alpha component.
In order to render an image to the screen, a printer, or another
image, pixel values must be converted to color and alpha components.
As arguments to or return values from methods of this class,
pixels are represented as 32-bit ints or as arrays of primitive types.
The number, order, and interpretation of color components for a
ColorModel
is specified by its ColorSpace
.
A ColorModel
used with pixel data that does not include
alpha information treats all pixels as opaque, which is an alpha
value of 1.0.
This ColorModel
class supports two representations of
pixel values. A pixel value can be a single 32-bit int or an
array of primitive types. The Java(tm) Platform 1.0 and 1.1 APIs
represented pixels as single byte
or single
int
values. For purposes of the ColorModel
class, pixel value arguments were passed as ints. The Java(tm) 2
Platform API introduced additional classes for representing images.
With BufferedImage
or RenderedImage
objects, based on Raster
and SampleModel
classes, pixel
values might not be conveniently representable as a single int.
Consequently, ColorModel
now has methods that accept
pixel values represented as arrays of primitive types. The primitive
type used by a particular ColorModel
object is called its
transfer type.
ColorModel
objects used with images for which pixel values
are not conveniently representable as a single int throw an
IllegalArgumentException
when methods taking a single int pixel
argument are called. Subclasses of ColorModel
must
specify the conditions under which this occurs. This does not
occur with DirectColorModel
or IndexColorModel
objects.
Currently, the transfer types supported by the Java 2D(tm) API are
DataBuffer.TYPE_BYTE, DataBuffer.TYPE_USHORT, DataBuffer.TYPE_INT,
DataBuffer.TYPE_SHORT, DataBuffer.TYPE_FLOAT, and DataBuffer.TYPE_DOUBLE.
Most rendering operations will perform much faster when using ColorModels
and images based on the first three of these types. In addition, some
image filtering operations are not supported for ColorModels and
images based on the latter three types.
The transfer type for a particular ColorModel
object is
specified when the object is created, either explicitly or by default.
All subclasses of ColorModel
must specify what the
possible transfer types are and how the number of elements in the
primitive arrays representing pixels is determined.
For BufferedImages
, the transfer type of its
Raster
and of the Raster
object's
SampleModel
(available from the
getTransferType
methods of these classes) must match that
of the ColorModel
. The number of elements in an array
representing a pixel for the Raster
and
SampleModel
(available from the
getNumDataElements
methods of these classes) must match
that of the ColorModel
.
The algorithm used to convert from pixel values to color and alpha
components varies by subclass. For example, there is not necessarily
a one-to-one correspondence between samples obtained from the
SampleModel
of a BufferedImage
object's
Raster
and color/alpha components. Even when
there is such a correspondence, the number of bits in a sample is not
necessarily the same as the number of bits in the corresponding color/alpha
component. Each subclass must specify how the translation from
pixel values to color/alpha components is done.
Methods in the ColorModel
class use two different
representations of color and alpha components - a normalized form
and an unnormalized form. In the normalized form, each component is a
float
value between some minimum and maximum values. For
the alpha component, the minimum is 0.0 and the maximum is 1.0. For
color components the minimum and maximum values for each component can
be obtained from the ColorSpace
object. These values
will often be 0.0 and 1.0 (e.g. normalized component values for the
default sRGB color space range from 0.0 to 1.0), but some color spaces
have component values with different upper and lower limits. These
limits can be obtained using the getMinValue
and
getMaxValue
methods of the ColorSpace
class. Normalized color component values are not premultiplied.
All ColorModels
must support the normalized form.
In the unnormalized
form, each component is an unsigned integral value between 0 and
2n - 1, where n is the number of significant bits for a
particular component. If pixel values for a particular
ColorModel
represent color samples premultiplied by
the alpha sample, unnormalized color component values are
also premultiplied. The unnormalized form is used only with instances
of ColorModel
whose ColorSpace
has minimum
component values of 0.0 for all components and maximum values of
1.0 for all components.
The unnormalized form for color and alpha components can be a convenient
representation for ColorModels
whose normalized component
values all lie
between 0.0 and 1.0. In such cases the integral value 0 maps to 0.0 and
the value 2n - 1 maps to 1.0. In other cases, such as
when the normalized component values can be either negative or positive,
the unnormalized form is not convenient. Such ColorModel
objects throw an IllegalArgumentException
when methods involving
an unnormalized argument are called. Subclasses of ColorModel
must specify the conditions under which this occurs.
- See Also:
-
Field Summary
Modifier and TypeFieldDescriptionprotected int
The total number of bits in the pixel.protected int
Data type of the array used to represent pixel values.Fields declared in interface java.awt.Transparency
BITMASK, OPAQUE, TRANSLUCENT
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Constructor Summary
ModifierConstructorDescriptionColorModel
(int bits) Constructs aColorModel
that translates pixels of the specified number of bits to color/alpha components.protected
ColorModel
(int pixel_bits, int[] bits, ColorSpace cspace, boolean hasAlpha, boolean isAlphaPremultiplied, int transparency, int transferType) Constructs aColorModel
that translates pixel values to color/alpha components. -
Method Summary
Modifier and TypeMethodDescriptioncoerceData
(WritableRaster raster, boolean isAlphaPremultiplied) Forces the raster data to match the state specified in theisAlphaPremultiplied
variable, assuming the data is currently correctly described by thisColorModel
.createCompatibleSampleModel
(int w, int h) Creates aSampleModel
with the specified width and height that has a data layout compatible with thisColorModel
.createCompatibleWritableRaster
(int w, int h) Creates aWritableRaster
with the specified width and height that has a data layout (SampleModel
) compatible with thisColorModel
.boolean
This method simply delegates to the default implementation inObject
which is identical to an==
test since this class cannot enforce the issues of a proper equality test among multiple independent subclass branches.abstract int
getAlpha
(int pixel) Returns the alpha component for the specified pixel, scaled from 0 to 255.int
Returns the alpha component for the specified pixel, scaled from 0 to 255.getAlphaRaster
(WritableRaster raster) Returns aRaster
representing the alpha channel of an image, extracted from the inputRaster
, provided that pixel values of thisColorModel
represent color and alpha information as separate spatial bands (e.g.abstract int
getBlue
(int pixel) Returns the blue color component for the specified pixel, scaled from 0 to 255 in the default RGB ColorSpace, sRGB.int
Returns the blue color component for the specified pixel, scaled from 0 to 255 in the default RGBColorSpace
, sRGB.final ColorSpace
Returns theColorSpace
associated with thisColorModel
.int[]
getComponents
(int pixel, int[] components, int offset) Returns an array of unnormalized color/alpha components given a pixel in thisColorModel
.int[]
getComponents
(Object pixel, int[] components, int offset) Returns an array of unnormalized color/alpha components given a pixel in thisColorModel
.int[]
Returns an array of the number of bits per color/alpha component.int
getComponentSize
(int componentIdx) Returns the number of bits for the specified color/alpha component.int
getDataElement
(float[] normComponents, int normOffset) Returns a pixel value represented as anint
in thisColorModel
, given an array of normalized color/alpha components.int
getDataElement
(int[] components, int offset) Returns a pixel value represented as anint
in thisColorModel
, given an array of unnormalized color/alpha components.getDataElements
(float[] normComponents, int normOffset, Object obj) Returns a data element array representation of a pixel in thisColorModel
, given an array of normalized color/alpha components.getDataElements
(int[] components, int offset, Object obj) Returns a data element array representation of a pixel in thisColorModel
, given an array of unnormalized color/alpha components.getDataElements
(int rgb, Object pixel) Returns a data element array representation of a pixel in thisColorModel
, given an integer pixel representation in the default RGB color model.abstract int
getGreen
(int pixel) Returns the green color component for the specified pixel, scaled from 0 to 255 in the default RGB ColorSpace, sRGB.int
Returns the green color component for the specified pixel, scaled from 0 to 255 in the default RGBColorSpace
, sRGB.float[]
getNormalizedComponents
(int[] components, int offset, float[] normComponents, int normOffset) Returns an array of all of the color/alpha components in normalized form, given an unnormalized component array.float[]
getNormalizedComponents
(Object pixel, float[] normComponents, int normOffset) Returns an array of all of the color/alpha components in normalized form, given a pixel in thisColorModel
.int
Returns the number of color components in thisColorModel
.int
Returns the number of components, including alpha, in thisColorModel
.int
Returns the number of bits per pixel described by thisColorModel
.abstract int
getRed
(int pixel) Returns the red color component for the specified pixel, scaled from 0 to 255 in the default RGB ColorSpace, sRGB.int
Returns the red color component for the specified pixel, scaled from 0 to 255 in the default RGBColorSpace
, sRGB.int
getRGB
(int pixel) Returns the color/alpha components of the pixel in the default RGB color model format.int
Returns the color/alpha components for the specified pixel in the default RGB color model format.static ColorModel
Returns aDirectColorModel
that describes the default format for integer RGB values used in many of the methods in the AWT image interfaces for the convenience of the programmer.final int
Returns the transfer type of thisColorModel
.int
Returns the transparency.int[]
getUnnormalizedComponents
(float[] normComponents, int normOffset, int[] components, int offset) Returns an array of all of the color/alpha components in unnormalized form, given a normalized component array.final boolean
hasAlpha()
Returns whether or not alpha is supported in thisColorModel
.int
hashCode()
This method simply delegates to the default implementation inObject
which returns the system ID for the class.final boolean
Returns whether or not the alpha has been premultiplied in the pixel values to be translated by thisColorModel
.boolean
isCompatibleRaster
(Raster raster) Returnstrue
ifraster
is compatible with thisColorModel
andfalse
if it is not.boolean
Checks if theSampleModel
is compatible with thisColorModel
.toString()
Returns theString
representation of the contents of thisColorModel
object.
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Field Details
-
pixel_bits
protected int pixel_bitsThe total number of bits in the pixel. -
transferType
protected int transferTypeData type of the array used to represent pixel values.
-
-
Constructor Details
-
ColorModel
public ColorModel(int bits) Constructs aColorModel
that translates pixels of the specified number of bits to color/alpha components. The color space is the default RGBColorSpace
, which is sRGB. Pixel values are assumed to include alpha information. If color and alpha information are represented in the pixel value as separate spatial bands, the color bands are assumed not to be premultiplied with the alpha value. The transparency type is java.awt.Transparency.TRANSLUCENT. The transfer type will be the smallest of DataBuffer.TYPE_BYTE, DataBuffer.TYPE_USHORT, or DataBuffer.TYPE_INT that can hold a single pixel (or DataBuffer.TYPE_UNDEFINED if bits is greater than 32). Since this constructor has no information about the number of bits per color and alpha component, any subclass calling this constructor should override any method that requires this information.- Parameters:
bits
- the number of bits of a pixel- Throws:
IllegalArgumentException
- if the number of bits inbits
is less than 1
-
ColorModel
protected ColorModel(int pixel_bits, int[] bits, ColorSpace cspace, boolean hasAlpha, boolean isAlphaPremultiplied, int transparency, int transferType) Constructs aColorModel
that translates pixel values to color/alpha components. Color components will be in the specifiedColorSpace
.pixel_bits
is the number of bits in the pixel values. The bits array specifies the number of significant bits per color and alpha component. Its length should be the number of components in theColorSpace
if there is no alpha information in the pixel values, or one more than this number if there is alpha information.hasAlpha
indicates whether or not alpha information is present. Theboolean
isAlphaPremultiplied
specifies how to interpret pixel values in which color and alpha information are represented as separate spatial bands. If theboolean
istrue
, color samples are assumed to have been multiplied by the alpha sample. Thetransparency
specifies what alpha values can be represented by this color model. The transfer type is the type of primitive array used to represent pixel values. Note that the bits array contains the number of significant bits per color/alpha component after the translation from pixel values. For example, for anIndexColorModel
withpixel_bits
equal to 16, the bits array might have four elements with each element set to 8.- Parameters:
pixel_bits
- the number of bits in the pixel valuesbits
- array that specifies the number of significant bits per color and alpha componentcspace
- the specifiedColorSpace
hasAlpha
-true
if alpha information is present;false
otherwiseisAlphaPremultiplied
-true
if color samples are assumed to be premultiplied by the alpha samples;false
otherwisetransparency
- what alpha values can be represented by this color modeltransferType
- the type of the array used to represent pixel values- Throws:
IllegalArgumentException
- if the length of the bit array is less than the number of color or alpha components in thisColorModel
, or if the transparency is not a valid value.IllegalArgumentException
- if the sum of the number of bits inbits
is less than 1 or if any of the elements inbits
is less than 0.- See Also:
-
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Method Details
-
getRGBdefault
Returns aDirectColorModel
that describes the default format for integer RGB values used in many of the methods in the AWT image interfaces for the convenience of the programmer. The color space is the defaultColorSpace
, sRGB. The format for the RGB values is an integer with 8 bits each of alpha, red, green, and blue color components ordered correspondingly from the most significant byte to the least significant byte, as in: 0xAARRGGBB. Color components are not premultiplied by the alpha component. This format does not necessarily represent the native or the most efficientColorModel
for a particular device or for all images. It is merely used as a common color model format.- Returns:
- a
DirectColorModel
object describing default RGB values.
-
hasAlpha
public final boolean hasAlpha()Returns whether or not alpha is supported in thisColorModel
.- Returns:
true
if alpha is supported in thisColorModel
;false
otherwise.
-
isAlphaPremultiplied
public final boolean isAlphaPremultiplied()Returns whether or not the alpha has been premultiplied in the pixel values to be translated by thisColorModel
. If the boolean istrue
, thisColorModel
is to be used to interpret pixel values in which color and alpha information are represented as separate spatial bands, and color samples are assumed to have been multiplied by the alpha sample.- Returns:
true
if the alpha values are premultiplied in the pixel values to be translated by thisColorModel
;false
otherwise.
-
getTransferType
public final int getTransferType()Returns the transfer type of thisColorModel
. The transfer type is the type of primitive array used to represent pixel values as arrays.- Returns:
- the transfer type.
- Since:
- 1.3
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getPixelSize
public int getPixelSize()Returns the number of bits per pixel described by thisColorModel
.- Returns:
- the number of bits per pixel.
-
getComponentSize
public int getComponentSize(int componentIdx) Returns the number of bits for the specified color/alpha component. Color components are indexed in the order specified by theColorSpace
. Typically, this order reflects the name of the color space type. For example, for TYPE_RGB, index 0 corresponds to red, index 1 to green, and index 2 to blue. If thisColorModel
supports alpha, the alpha component corresponds to the index following the last color component.- Parameters:
componentIdx
- the index of the color/alpha component- Returns:
- the number of bits for the color/alpha component at the specified index.
- Throws:
ArrayIndexOutOfBoundsException
- ifcomponentIdx
is greater than or equal to the number of components or less than zeroNullPointerException
- if the number of bits array isnull
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getComponentSize
public int[] getComponentSize()Returns an array of the number of bits per color/alpha component. The array contains the color components in the order specified by theColorSpace
, followed by the alpha component, if present.- Returns:
- an array of the number of bits per color/alpha component
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getTransparency
public int getTransparency()Returns the transparency. Returns either OPAQUE, BITMASK, or TRANSLUCENT.- Specified by:
getTransparency
in interfaceTransparency
- Returns:
- the transparency of this
ColorModel
. - See Also:
-
getNumComponents
public int getNumComponents()Returns the number of components, including alpha, in thisColorModel
. This is equal to the number of color components, optionally plus one, if there is an alpha component.- Returns:
- the number of components in this
ColorModel
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getNumColorComponents
public int getNumColorComponents()Returns the number of color components in thisColorModel
. This is the number of components returned byColorSpace.getNumComponents()
.- Returns:
- the number of color components in this
ColorModel
. - See Also:
-
getRed
public abstract int getRed(int pixel) Returns the red color component for the specified pixel, scaled from 0 to 255 in the default RGB ColorSpace, sRGB. A color conversion is done if necessary. The pixel value is specified as an int. AnIllegalArgumentException
is thrown if pixel values for thisColorModel
are not conveniently representable as a single int. The returned value is not a pre-multiplied value. For example, if the alpha is premultiplied, this method divides it out before returning the value. If the alpha value is 0, the red value is 0.- Parameters:
pixel
- a specified pixel- Returns:
- the value of the red component of the specified pixel.
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getGreen
public abstract int getGreen(int pixel) Returns the green color component for the specified pixel, scaled from 0 to 255 in the default RGB ColorSpace, sRGB. A color conversion is done if necessary. The pixel value is specified as an int. AnIllegalArgumentException
is thrown if pixel values for thisColorModel
are not conveniently representable as a single int. The returned value is a non pre-multiplied value. For example, if the alpha is premultiplied, this method divides it out before returning the value. If the alpha value is 0, the green value is 0.- Parameters:
pixel
- the specified pixel- Returns:
- the value of the green component of the specified pixel.
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getBlue
public abstract int getBlue(int pixel) Returns the blue color component for the specified pixel, scaled from 0 to 255 in the default RGB ColorSpace, sRGB. A color conversion is done if necessary. The pixel value is specified as an int. AnIllegalArgumentException
is thrown if pixel values for thisColorModel
are not conveniently representable as a single int. The returned value is a non pre-multiplied value, for example, if the alpha is premultiplied, this method divides it out before returning the value. If the alpha value is 0, the blue value is 0.- Parameters:
pixel
- the specified pixel- Returns:
- the value of the blue component of the specified pixel.
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getAlpha
public abstract int getAlpha(int pixel) Returns the alpha component for the specified pixel, scaled from 0 to 255. The pixel value is specified as an int. AnIllegalArgumentException
is thrown if pixel values for thisColorModel
are not conveniently representable as a single int.- Parameters:
pixel
- the specified pixel- Returns:
- the value of alpha component of the specified pixel.
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getRGB
public int getRGB(int pixel) Returns the color/alpha components of the pixel in the default RGB color model format. A color conversion is done if necessary. The pixel value is specified as an int. AnIllegalArgumentException
thrown if pixel values for thisColorModel
are not conveniently representable as a single int. The returned value is in a non pre-multiplied format. For example, if the alpha is premultiplied, this method divides it out of the color components. If the alpha value is 0, the color values are 0.- Parameters:
pixel
- the specified pixel- Returns:
- the RGB value of the color/alpha components of the specified pixel.
- See Also:
-
getRed
Returns the red color component for the specified pixel, scaled from 0 to 255 in the default RGBColorSpace
, sRGB. A color conversion is done if necessary. The pixel value is specified by an array of data elements of type transferType passed in as an object reference. The returned value is a non pre-multiplied value. For example, if alpha is premultiplied, this method divides it out before returning the value. If the alpha value is 0, the red value is 0. IfinData
is not a primitive array of type transferType, aClassCastException
is thrown. AnArrayIndexOutOfBoundsException
is thrown ifinData
is not large enough to hold a pixel value for thisColorModel
. If thistransferType
is not supported, aUnsupportedOperationException
will be thrown. SinceColorModel
is an abstract class, any instance must be an instance of a subclass. Subclasses inherit the implementation of this method and if they don't override it, this method throws an exception if the subclass uses atransferType
other thanDataBuffer.TYPE_BYTE
,DataBuffer.TYPE_USHORT
, orDataBuffer.TYPE_INT
.- Parameters:
inData
- an array of pixel values- Returns:
- the value of the red component of the specified pixel.
- Throws:
ClassCastException
- ifinData
is not a primitive array of typetransferType
ArrayIndexOutOfBoundsException
- ifinData
is not large enough to hold a pixel value for thisColorModel
UnsupportedOperationException
- if thistransferType
is not supported by thisColorModel
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getGreen
Returns the green color component for the specified pixel, scaled from 0 to 255 in the default RGBColorSpace
, sRGB. A color conversion is done if necessary. The pixel value is specified by an array of data elements of type transferType passed in as an object reference. The returned value will be a non pre-multiplied value. For example, if the alpha is premultiplied, this method divides it out before returning the value. If the alpha value is 0, the green value is 0. IfinData
is not a primitive array of type transferType, aClassCastException
is thrown. AnArrayIndexOutOfBoundsException
is thrown ifinData
is not large enough to hold a pixel value for thisColorModel
. If thistransferType
is not supported, aUnsupportedOperationException
will be thrown. SinceColorModel
is an abstract class, any instance must be an instance of a subclass. Subclasses inherit the implementation of this method and if they don't override it, this method throws an exception if the subclass uses atransferType
other thanDataBuffer.TYPE_BYTE
,DataBuffer.TYPE_USHORT
, orDataBuffer.TYPE_INT
.- Parameters:
inData
- an array of pixel values- Returns:
- the value of the green component of the specified pixel.
- Throws:
ClassCastException
- ifinData
is not a primitive array of typetransferType
ArrayIndexOutOfBoundsException
- ifinData
is not large enough to hold a pixel value for thisColorModel
UnsupportedOperationException
- if thistransferType
is not supported by thisColorModel
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getBlue
Returns the blue color component for the specified pixel, scaled from 0 to 255 in the default RGBColorSpace
, sRGB. A color conversion is done if necessary. The pixel value is specified by an array of data elements of type transferType passed in as an object reference. The returned value is a non pre-multiplied value. For example, if the alpha is premultiplied, this method divides it out before returning the value. If the alpha value is 0, the blue value will be 0. IfinData
is not a primitive array of type transferType, aClassCastException
is thrown. AnArrayIndexOutOfBoundsException
is thrown ifinData
is not large enough to hold a pixel value for thisColorModel
. If thistransferType
is not supported, aUnsupportedOperationException
will be thrown. SinceColorModel
is an abstract class, any instance must be an instance of a subclass. Subclasses inherit the implementation of this method and if they don't override it, this method throws an exception if the subclass uses atransferType
other thanDataBuffer.TYPE_BYTE
,DataBuffer.TYPE_USHORT
, orDataBuffer.TYPE_INT
.- Parameters:
inData
- an array of pixel values- Returns:
- the value of the blue component of the specified pixel.
- Throws:
ClassCastException
- ifinData
is not a primitive array of typetransferType
ArrayIndexOutOfBoundsException
- ifinData
is not large enough to hold a pixel value for thisColorModel
UnsupportedOperationException
- if thistransferType
is not supported by thisColorModel
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getAlpha
Returns the alpha component for the specified pixel, scaled from 0 to 255. The pixel value is specified by an array of data elements of type transferType passed in as an object reference. If inData is not a primitive array of type transferType, aClassCastException
is thrown. AnArrayIndexOutOfBoundsException
is thrown ifinData
is not large enough to hold a pixel value for thisColorModel
. If thistransferType
is not supported, aUnsupportedOperationException
will be thrown. SinceColorModel
is an abstract class, any instance must be an instance of a subclass. Subclasses inherit the implementation of this method and if they don't override it, this method throws an exception if the subclass uses atransferType
other thanDataBuffer.TYPE_BYTE
,DataBuffer.TYPE_USHORT
, orDataBuffer.TYPE_INT
.- Parameters:
inData
- the specified pixel- Returns:
- the alpha component of the specified pixel, scaled from 0 to 255.
- Throws:
ClassCastException
- ifinData
is not a primitive array of typetransferType
ArrayIndexOutOfBoundsException
- ifinData
is not large enough to hold a pixel value for thisColorModel
UnsupportedOperationException
- if thistranferType
is not supported by thisColorModel
-
getRGB
Returns the color/alpha components for the specified pixel in the default RGB color model format. A color conversion is done if necessary. The pixel value is specified by an array of data elements of type transferType passed in as an object reference. If inData is not a primitive array of type transferType, aClassCastException
is thrown. AnArrayIndexOutOfBoundsException
is thrown ifinData
is not large enough to hold a pixel value for thisColorModel
. The returned value will be in a non pre-multiplied format, i.e. if the alpha is premultiplied, this method will divide it out of the color components (if the alpha value is 0, the color values will be 0).- Parameters:
inData
- the specified pixel- Returns:
- the color and alpha components of the specified pixel.
- See Also:
-
getDataElements
Returns a data element array representation of a pixel in thisColorModel
, given an integer pixel representation in the default RGB color model. This array can then be passed to theWritableRaster.setDataElements(int, int, java.lang.Object)
method of aWritableRaster
object. If the pixel variable isnull
, a new array will be allocated. Ifpixel
is notnull
, it must be a primitive array of typetransferType
; otherwise, aClassCastException
is thrown. AnArrayIndexOutOfBoundsException
is thrown ifpixel
is not large enough to hold a pixel value for thisColorModel
. The pixel array is returned. If thistransferType
is not supported, aUnsupportedOperationException
will be thrown. SinceColorModel
is an abstract class, any instance is an instance of a subclass. Subclasses must override this method since the implementation in this abstract class throws anUnsupportedOperationException
.- Parameters:
rgb
- the integer pixel representation in the default RGB color modelpixel
- the specified pixel- Returns:
- an array representation of the specified pixel in this
ColorModel
. - Throws:
ClassCastException
- ifpixel
is not a primitive array of typetransferType
ArrayIndexOutOfBoundsException
- ifpixel
is not large enough to hold a pixel value for thisColorModel
UnsupportedOperationException
- if this method is not supported by thisColorModel
- See Also:
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getComponents
public int[] getComponents(int pixel, int[] components, int offset) Returns an array of unnormalized color/alpha components given a pixel in thisColorModel
. The pixel value is specified as anint
. AnIllegalArgumentException
will be thrown if pixel values for thisColorModel
are not conveniently representable as a singleint
or if color component values for thisColorModel
are not conveniently representable in the unnormalized form. For example, this method can be used to retrieve the components for a specific pixel value in aDirectColorModel
. If the components array isnull
, a new array will be allocated. The components array will be returned. Color/alpha components are stored in the components array starting atoffset
(even if the array is allocated by this method). AnArrayIndexOutOfBoundsException
is thrown if the components array is notnull
and is not large enough to hold all the color and alpha components (starting at offset). SinceColorModel
is an abstract class, any instance is an instance of a subclass. Subclasses must override this method since the implementation in this abstract class throws anUnsupportedOperationException
.- Parameters:
pixel
- the specified pixelcomponents
- the array to receive the color and alpha components of the specified pixeloffset
- the offset into thecomponents
array at which to start storing the color and alpha components- Returns:
- an array containing the color and alpha components of the specified pixel starting at the specified offset.
- Throws:
UnsupportedOperationException
- if this method is not supported by thisColorModel
-
getComponents
Returns an array of unnormalized color/alpha components given a pixel in thisColorModel
. The pixel value is specified by an array of data elements of type transferType passed in as an object reference. Ifpixel
is not a primitive array of type transferType, aClassCastException
is thrown. AnIllegalArgumentException
will be thrown if color component values for thisColorModel
are not conveniently representable in the unnormalized form. AnArrayIndexOutOfBoundsException
is thrown ifpixel
is not large enough to hold a pixel value for thisColorModel
. This method can be used to retrieve the components for a specific pixel value in anyColorModel
. If the components array isnull
, a new array will be allocated. The components array will be returned. Color/alpha components are stored in thecomponents
array starting atoffset
(even if the array is allocated by this method). AnArrayIndexOutOfBoundsException
is thrown if the components array is notnull
and is not large enough to hold all the color and alpha components (starting atoffset
). SinceColorModel
is an abstract class, any instance is an instance of a subclass. Subclasses must override this method since the implementation in this abstract class throws anUnsupportedOperationException
.- Parameters:
pixel
- the specified pixelcomponents
- an array that receives the color and alpha components of the specified pixeloffset
- the index into thecomponents
array at which to begin storing the color and alpha components of the specified pixel- Returns:
- an array containing the color and alpha components of the specified pixel starting at the specified offset.
- Throws:
UnsupportedOperationException
- if this method is not supported by thisColorModel
-
getUnnormalizedComponents
public int[] getUnnormalizedComponents(float[] normComponents, int normOffset, int[] components, int offset) Returns an array of all of the color/alpha components in unnormalized form, given a normalized component array. Unnormalized components are unsigned integral values between 0 and 2n - 1, where n is the number of bits for a particular component. Normalized components are float values between a per component minimum and maximum specified by theColorSpace
object for thisColorModel
. AnIllegalArgumentException
will be thrown if color component values for thisColorModel
are not conveniently representable in the unnormalized form. If thecomponents
array isnull
, a new array will be allocated. Thecomponents
array will be returned. Color/alpha components are stored in thecomponents
array starting atoffset
(even if the array is allocated by this method). AnArrayIndexOutOfBoundsException
is thrown if thecomponents
array is notnull
and is not large enough to hold all the color and alpha components (starting atoffset
). AnIllegalArgumentException
is thrown if thenormComponents
array is not large enough to hold all the color and alpha components starting atnormOffset
.- Parameters:
normComponents
- an array containing normalized componentsnormOffset
- the offset into thenormComponents
array at which to start retrieving normalized componentscomponents
- an array that receives the components fromnormComponents
offset
- the index intocomponents
at which to begin storing normalized components fromnormComponents
- Returns:
- an array containing unnormalized color and alpha components.
- Throws:
IllegalArgumentException
- If the component values for thisColorModel
are not conveniently representable in the unnormalized form.IllegalArgumentException
- if the length ofnormComponents
minusnormOffset
is less thannumComponents
UnsupportedOperationException
- if the constructor of thisColorModel
called thesuper(bits)
constructor, but did not override this method. See the constructor,ColorModel(int)
.
-
getNormalizedComponents
public float[] getNormalizedComponents(int[] components, int offset, float[] normComponents, int normOffset) Returns an array of all of the color/alpha components in normalized form, given an unnormalized component array. Unnormalized components are unsigned integral values between 0 and 2n - 1, where n is the number of bits for a particular component. Normalized components are float values between a per component minimum and maximum specified by theColorSpace
object for thisColorModel
. AnIllegalArgumentException
will be thrown if color component values for thisColorModel
are not conveniently representable in the unnormalized form. If thenormComponents
array isnull
, a new array will be allocated. ThenormComponents
array will be returned. Color/alpha components are stored in thenormComponents
array starting atnormOffset
(even if the array is allocated by this method). AnArrayIndexOutOfBoundsException
is thrown if thenormComponents
array is notnull
and is not large enough to hold all the color and alpha components (starting atnormOffset
). AnIllegalArgumentException
is thrown if thecomponents
array is not large enough to hold all the color and alpha components starting atoffset
.Since
ColorModel
is an abstract class, any instance is an instance of a subclass. The default implementation of this method in this abstract class assumes that component values for this class are conveniently representable in the unnormalized form. Therefore, subclasses which may have instances which do not support the unnormalized form must override this method.- Parameters:
components
- an array containing unnormalized componentsoffset
- the offset into thecomponents
array at which to start retrieving unnormalized componentsnormComponents
- an array that receives the normalized componentsnormOffset
- the index intonormComponents
at which to begin storing normalized components- Returns:
- an array containing normalized color and alpha components.
- Throws:
IllegalArgumentException
- If the component values for thisColorModel
are not conveniently representable in the unnormalized form.UnsupportedOperationException
- if the constructor of thisColorModel
called thesuper(bits)
constructor, but did not override this method. See the constructor,ColorModel(int)
.UnsupportedOperationException
- if this method is unable to determine the number of bits per component
-
getDataElement
public int getDataElement(int[] components, int offset) Returns a pixel value represented as anint
in thisColorModel
, given an array of unnormalized color/alpha components. This method will throw anIllegalArgumentException
if component values for thisColorModel
are not conveniently representable as a singleint
or if color component values for thisColorModel
are not conveniently representable in the unnormalized form. AnArrayIndexOutOfBoundsException
is thrown if thecomponents
array is not large enough to hold all the color and alpha components (starting atoffset
). SinceColorModel
is an abstract class, any instance is an instance of a subclass. Subclasses must override this method since the implementation in this abstract class throws anUnsupportedOperationException
.- Parameters:
components
- an array of unnormalized color and alpha componentsoffset
- the index intocomponents
at which to begin retrieving the color and alpha components- Returns:
- an
int
pixel value in thisColorModel
corresponding to the specified components. - Throws:
IllegalArgumentException
- if pixel values for thisColorModel
are not conveniently representable as a singleint
IllegalArgumentException
- if component values for thisColorModel
are not conveniently representable in the unnormalized formArrayIndexOutOfBoundsException
- if thecomponents
array is not large enough to hold all of the color and alpha components starting atoffset
UnsupportedOperationException
- if this method is not supported by thisColorModel
-
getDataElements
Returns a data element array representation of a pixel in thisColorModel
, given an array of unnormalized color/alpha components. This array can then be passed to thesetDataElements
method of aWritableRaster
object. This method will throw anIllegalArgumentException
if color component values for thisColorModel
are not conveniently representable in the unnormalized form. AnArrayIndexOutOfBoundsException
is thrown if thecomponents
array is not large enough to hold all the color and alpha components (starting atoffset
). If theobj
variable isnull
, a new array will be allocated. Ifobj
is notnull
, it must be a primitive array of type transferType; otherwise, aClassCastException
is thrown. AnArrayIndexOutOfBoundsException
is thrown ifobj
is not large enough to hold a pixel value for thisColorModel
. SinceColorModel
is an abstract class, any instance is an instance of a subclass. Subclasses must override this method since the implementation in this abstract class throws anUnsupportedOperationException
.- Parameters:
components
- an array of unnormalized color and alpha componentsoffset
- the index intocomponents
at which to begin retrieving color and alpha componentsobj
- theObject
representing an array of color and alpha components- Returns:
- an
Object
representing an array of color and alpha components. - Throws:
ClassCastException
- ifobj
is not a primitive array of typetransferType
ArrayIndexOutOfBoundsException
- ifobj
is not large enough to hold a pixel value for thisColorModel
or thecomponents
array is not large enough to hold all of the color and alpha components starting atoffset
IllegalArgumentException
- if component values for thisColorModel
are not conveniently representable in the unnormalized formUnsupportedOperationException
- if this method is not supported by thisColorModel
- See Also:
-
getDataElement
public int getDataElement(float[] normComponents, int normOffset) Returns a pixel value represented as anint
in thisColorModel
, given an array of normalized color/alpha components. This method will throw anIllegalArgumentException
if pixel values for thisColorModel
are not conveniently representable as a singleint
. AnArrayIndexOutOfBoundsException
is thrown if thenormComponents
array is not large enough to hold all the color and alpha components (starting atnormOffset
). SinceColorModel
is an abstract class, any instance is an instance of a subclass. The default implementation of this method in this abstract class first converts from the normalized form to the unnormalized form and then callsgetDataElement(int[], int)
. Subclasses which may have instances which do not support the unnormalized form must override this method.- Parameters:
normComponents
- an array of normalized color and alpha componentsnormOffset
- the index intonormComponents
at which to begin retrieving the color and alpha components- Returns:
- an
int
pixel value in thisColorModel
corresponding to the specified components. - Throws:
IllegalArgumentException
- if pixel values for thisColorModel
are not conveniently representable as a singleint
ArrayIndexOutOfBoundsException
- if thenormComponents
array is not large enough to hold all of the color and alpha components starting atnormOffset
- Since:
- 1.4
-
getDataElements
Returns a data element array representation of a pixel in thisColorModel
, given an array of normalized color/alpha components. This array can then be passed to thesetDataElements
method of aWritableRaster
object. AnArrayIndexOutOfBoundsException
is thrown if thenormComponents
array is not large enough to hold all the color and alpha components (starting atnormOffset
). If theobj
variable isnull
, a new array will be allocated. Ifobj
is notnull
, it must be a primitive array of type transferType; otherwise, aClassCastException
is thrown. AnArrayIndexOutOfBoundsException
is thrown ifobj
is not large enough to hold a pixel value for thisColorModel
. SinceColorModel
is an abstract class, any instance is an instance of a subclass. The default implementation of this method in this abstract class first converts from the normalized form to the unnormalized form and then callsgetDataElement(int[], int, Object)
. Subclasses which may have instances which do not support the unnormalized form must override this method.- Parameters:
normComponents
- an array of normalized color and alpha componentsnormOffset
- the index intonormComponents
at which to begin retrieving color and alpha componentsobj
- a primitive data array to hold the returned pixel- Returns:
- an
Object
which is a primitive data array representation of a pixel - Throws:
ClassCastException
- ifobj
is not a primitive array of typetransferType
ArrayIndexOutOfBoundsException
- ifobj
is not large enough to hold a pixel value for thisColorModel
or thenormComponents
array is not large enough to hold all of the color and alpha components starting atnormOffset
- Since:
- 1.4
- See Also:
-
getNormalizedComponents
Returns an array of all of the color/alpha components in normalized form, given a pixel in thisColorModel
. The pixel value is specified by an array of data elements of type transferType passed in as an object reference. If pixel is not a primitive array of type transferType, aClassCastException
is thrown. AnArrayIndexOutOfBoundsException
is thrown ifpixel
is not large enough to hold a pixel value for thisColorModel
. Normalized components are float values between a per component minimum and maximum specified by theColorSpace
object for thisColorModel
. If thenormComponents
array isnull
, a new array will be allocated. ThenormComponents
array will be returned. Color/alpha components are stored in thenormComponents
array starting atnormOffset
(even if the array is allocated by this method). AnArrayIndexOutOfBoundsException
is thrown if thenormComponents
array is notnull
and is not large enough to hold all the color and alpha components (starting atnormOffset
). SinceColorModel
is an abstract class, any instance is an instance of a subclass. The default implementation of this method in this abstract class first retrieves color and alpha components in the unnormalized form usinggetComponents(Object, int[], int)
and then callsgetNormalizedComponents(int[], int, float[], int)
. Subclasses which may have instances which do not support the unnormalized form must override this method.- Parameters:
pixel
- the specified pixelnormComponents
- an array to receive the normalized componentsnormOffset
- the offset into thenormComponents
array at which to start storing normalized components- Returns:
- an array containing normalized color and alpha components.
- Throws:
ClassCastException
- ifpixel
is not a primitive array of type transferTypeArrayIndexOutOfBoundsException
- ifnormComponents
is not large enough to hold all color and alpha components starting atnormOffset
ArrayIndexOutOfBoundsException
- ifpixel
is not large enough to hold a pixel value for thisColorModel
.UnsupportedOperationException
- if the constructor of thisColorModel
called thesuper(bits)
constructor, but did not override this method. See the constructor,ColorModel(int)
.UnsupportedOperationException
- if this method is unable to determine the number of bits per component- Since:
- 1.4
-
equals
This method simply delegates to the default implementation inObject
which is identical to an==
test since this class cannot enforce the issues of a proper equality test among multiple independent subclass branches. Subclasses are encouraged to override this method and provide equality testing for their own properties in addition to equality tests for the following common base properties ofColorModel
:- Support for alpha component.
- Is alpha premultiplied.
- Number of bits per pixel.
- Type of transparency like Opaque, Bitmask or Translucent.
- Number of components in a pixel.
ColorSpace
type.- Type of the array used to represent pixel values.
- Number of significant bits per color and alpha component.
-
hashCode
public int hashCode()This method simply delegates to the default implementation inObject
which returns the system ID for the class. Subclasses are encouraged to override this method and provide a hash for their own properties in addition to hashing the values of the following common base properties ofColorModel
:- Support for alpha component.
- Is alpha premultiplied.
- Number of bits per pixel.
- Type of transparency like Opaque, Bitmask or Translucent.
- Number of components in a pixel.
ColorSpace
type.- Type of the array used to represent pixel values.
- Number of significant bits per color and alpha component.
-
getColorSpace
Returns theColorSpace
associated with thisColorModel
.- Returns:
- the
ColorSpace
of thisColorModel
.
-
coerceData
Forces the raster data to match the state specified in theisAlphaPremultiplied
variable, assuming the data is currently correctly described by thisColorModel
. It may multiply or divide the color raster data by alpha, or do nothing if the data is in the correct state. If the data needs to be coerced, this method will also return an instance of thisColorModel
with theisAlphaPremultiplied
flag set appropriately. This method will throw aUnsupportedOperationException
if it is not supported by thisColorModel
. SinceColorModel
is an abstract class, any instance is an instance of a subclass. Subclasses must override this method since the implementation in this abstract class throws anUnsupportedOperationException
.- Parameters:
raster
- theWritableRaster
dataisAlphaPremultiplied
-true
if the alpha is premultiplied;false
otherwise- Returns:
- a
ColorModel
object that represents the coerced data.
-
isCompatibleRaster
Returnstrue
ifraster
is compatible with thisColorModel
andfalse
if it is not. SinceColorModel
is an abstract class, any instance is an instance of a subclass. Subclasses must override this method since the implementation in this abstract class throws anUnsupportedOperationException
.- Parameters:
raster
- theRaster
object to test for compatibility- Returns:
true
ifraster
is compatible with thisColorModel
.- Throws:
UnsupportedOperationException
- if this method has not been implemented for thisColorModel
-
createCompatibleWritableRaster
Creates aWritableRaster
with the specified width and height that has a data layout (SampleModel
) compatible with thisColorModel
. SinceColorModel
is an abstract class, any instance is an instance of a subclass. Subclasses must override this method since the implementation in this abstract class throws anUnsupportedOperationException
.- Parameters:
w
- the width to apply to the newWritableRaster
h
- the height to apply to the newWritableRaster
- Returns:
- a
WritableRaster
object with the specified width and height. - Throws:
UnsupportedOperationException
- if this method is not supported by thisColorModel
- See Also:
-
createCompatibleSampleModel
Creates aSampleModel
with the specified width and height that has a data layout compatible with thisColorModel
. SinceColorModel
is an abstract class, any instance is an instance of a subclass. Subclasses must override this method since the implementation in this abstract class throws anUnsupportedOperationException
.- Parameters:
w
- the width to apply to the newSampleModel
h
- the height to apply to the newSampleModel
- Returns:
- a
SampleModel
object with the specified width and height. - Throws:
UnsupportedOperationException
- if this method is not supported by thisColorModel
- See Also:
-
isCompatibleSampleModel
Checks if theSampleModel
is compatible with thisColorModel
. SinceColorModel
is an abstract class, any instance is an instance of a subclass. Subclasses must override this method since the implementation in this abstract class throws anUnsupportedOperationException
.- Parameters:
sm
- the specifiedSampleModel
- Returns:
true
if the specifiedSampleModel
is compatible with thisColorModel
;false
otherwise.- Throws:
UnsupportedOperationException
- if this method is not supported by thisColorModel
- See Also:
-
getAlphaRaster
Returns aRaster
representing the alpha channel of an image, extracted from the inputRaster
, provided that pixel values of thisColorModel
represent color and alpha information as separate spatial bands (e.g.ComponentColorModel
andDirectColorModel
). This method assumes thatRaster
objects associated with such aColorModel
store the alpha band, if present, as the last band of image data. Returnsnull
if there is no separate spatial alpha channel associated with thisColorModel
. If this is anIndexColorModel
which has alpha in the lookup table, this method will returnnull
since there is no spatially discrete alpha channel. This method will create a newRaster
(but will share the data array). SinceColorModel
is an abstract class, any instance is an instance of a subclass. Subclasses must override this method to get any behavior other than returningnull
because the implementation in this abstract class returnsnull
.- Parameters:
raster
- the specifiedRaster
- Returns:
- a
Raster
representing the alpha channel of an image, obtained from the specifiedRaster
.
-
toString
Returns theString
representation of the contents of thisColorModel
object.
-