java.lang.Object | |||
↳ | java.awt.image.ColorModel | ||
↳ | java.awt.image.PackedColorModel | ||
↳ | java.awt.image.DirectColorModel |
The DirectColorModel
class is a ColorModel
class that works with pixel values that represent RGB
color and alpha information as separate samples and that pack all
samples for a single pixel into a single int, short, or byte quantity.
This class can be used only with ColorSpaces of type ColorSpace.TYPE_RGB.
In addition, for each component of the ColorSpace, the minimum
normalized component value obtained via the getMinValue()
method of ColorSpace must be 0.0, and the maximum value obtained via
the getMaxValue()
method must be 1.0 (these min/max
values are typical for RGB spaces).
There must be three color samples in the pixel values and there can
be a single alpha sample. For those methods that use a primitive array
pixel representation of type transferType
, the array
length is always one. The transfer
types supported are DataBuffer.TYPE_BYTE,
DataBuffer.TYPE_USHORT, and DataBuffer.TYPE_INT.
Color and alpha samples are stored in the single
element of the array in bits indicated by bit masks. Each bit mask
must be contiguous and masks must not overlap. The same masks apply to
the single int pixel representation used by other methods. The
correspondence of masks and color/alpha samples is as follows:
The translation from pixel values to color/alpha components for
display or processing purposes is a one-to-one correspondence of
samples to components. A DirectColorModel
is
typically used with image data which uses masks to define packed
samples. For example, a DirectColorModel
can be used in
conjunction with a SinglePixelPackedSampleModel
to
construct a BufferedImage
. Normally the masks used by the
SampleModel
and the ColorModel
would be the
same. However, if they are different, the color interpretation
of pixel data will be done according to the masks of the
ColorModel
.
A single int pixel representation is valid for all objects of this
class, since it is always possible to represent pixel values used with
this class in a single int. Therefore, methods which use this
representation will not throw an IllegalArgumentException
due to an invalid pixel value.
This color model is similar to an X11 TrueColor visual.
The default RGB ColorModel specified by the
getRGBdefault
method is a
DirectColorModel
with the following parameters:
Number of bits: 32 Red mask: 0x00ff0000 Green mask: 0x0000ff00 Blue mask: 0x000000ff Alpha mask: 0xff000000 Color space: sRGB isAlphaPremultiplied: False Transparency: Transparency.TRANSLUCENT transferType: DataBuffer.TYPE_INT
Many of the methods in this class are final. This is because the underlying native graphics code makes assumptions about the layout and operation of this class and those assumptions are reflected in the implementations of the methods here that are marked final. You can subclass this class for other reasons, but you cannot override or modify the behavior of those methods.
[Expand]
Inherited Constants | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
From interface
java.awt.Transparency
|
[Expand]
Inherited Fields | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
From class
java.awt.image.ColorModel
|
Public Constructors | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Constructs a
DirectColorModel from the specified masks
that indicate which bits in an int pixel representation
contain the red, green and blue color samples. | |||||||||||
Constructs a
DirectColorModel from the specified masks
that indicate which bits in an int pixel representation
contain the red, green and blue color samples and the alpha sample,
if present. | |||||||||||
Constructs a
DirectColorModel from the specified
parameters. |
Public Methods | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Forces the raster data to match the state specified in the
isAlphaPremultiplied variable, assuming the data is
currently correctly described by this ColorModel . | |||||||||||
Creates a
WritableRaster with the specified width and
height that has a data layout (SampleModel ) compatible
with this ColorModel . | |||||||||||
Returns the alpha component for the specified pixel, scaled
from 0 to 255.
| |||||||||||
Returns the alpha component for the specified pixel, scaled
from 0 to 255.
| |||||||||||
Returns the mask indicating which bits in an
int pixel
representation contain the alpha component. | |||||||||||
Returns the blue color component for the specified pixel, scaled
from 0 to 255 in the default RGB
ColorSpace , sRGB. | |||||||||||
Returns the blue color component for the specified pixel, scaled
from 0 to 255 in the default RGB
ColorSpace , sRGB. | |||||||||||
Returns the mask indicating which bits in an
int pixel
representation contain the blue color component. | |||||||||||
Returns an array of unnormalized color/alpha components given a pixel
in this
ColorModel . | |||||||||||
Returns an array of unnormalized color/alpha components given a pixel
in this
ColorModel . | |||||||||||
Returns a pixel value represented as an
int in this
ColorModel , given an array of unnormalized color/alpha
components. | |||||||||||
Returns a data element array representation of a pixel in this
ColorModel , given an array of unnormalized color/alpha
components. | |||||||||||
Returns a data element array representation of a pixel in this
ColorModel , given an integer pixel representation in the
default RGB color model. | |||||||||||
Returns the green color component for the specified pixel, scaled
from 0 to 255 in the default RGB
ColorSpace , sRGB. | |||||||||||
Returns the green color component for the specified pixel, scaled
from 0 to 255 in the default RGB
ColorSpace , sRGB. | |||||||||||
Returns the mask indicating which bits in an
int pixel
representation contain the green color component. | |||||||||||
Returns the color/alpha components for the specified pixel in the
default RGB color model format.
| |||||||||||
Returns the color/alpha components of the pixel in the default
RGB color model format.
| |||||||||||
Returns the red color component for the specified pixel, scaled
from 0 to 255 in the default RGB
ColorSpace , sRGB. | |||||||||||
Returns the red color component for the specified pixel, scaled
from 0 to 255 in the default RGB
ColorSpace , sRGB. | |||||||||||
Returns the mask indicating which bits in an
int pixel
representation contain the red color component. | |||||||||||
Returns
true if raster is compatible
with this ColorModel and false if it is
not. | |||||||||||
Returns a
String that represents this
DirectColorModel . |
[Expand]
Inherited Methods | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
From class
java.awt.image.PackedColorModel
| |||||||||||
From class
java.awt.image.ColorModel
| |||||||||||
From class
java.lang.Object
| |||||||||||
From interface
java.awt.Transparency
|
Constructs a DirectColorModel
from the specified masks
that indicate which bits in an int
pixel representation
contain the red, green and blue color samples. As pixel values do not
contain alpha information, all pixels are treated as opaque, which
means that alpha = 1.0. All of the bits
in each mask must be contiguous and fit in the specified number
of least significant bits of an int
pixel representation.
The ColorSpace
is the default sRGB space. The
transparency value is Transparency.OPAQUE. The transfer type
is the smallest of DataBuffer.TYPE_BYTE, DataBuffer.TYPE_USHORT,
or DataBuffer.TYPE_INT that can hold a single pixel.
bits | the number of bits in the pixel values; for example, the sum of the number of bits in the masks. |
---|---|
rmask | specifies a mask indicating which bits in an integer pixel contain the red component |
gmask | specifies a mask indicating which bits in an integer pixel contain the green component |
bmask | specifies a mask indicating which bits in an integer pixel contain the blue component |
Constructs a DirectColorModel
from the specified masks
that indicate which bits in an int
pixel representation
contain the red, green and blue color samples and the alpha sample,
if present. If amask
is 0, pixel values do not contain
alpha information and all pixels are treated as opaque, which means
that alpha = 1.0. All of the bits in each mask must
be contiguous and fit in the specified number of least significant bits
of an int
pixel representation. Alpha, if present, is not
premultiplied. The ColorSpace
is the default sRGB space.
The transparency value is Transparency.OPAQUE if no alpha is
present, or Transparency.TRANSLUCENT otherwise. The transfer type
is the smallest of DataBuffer.TYPE_BYTE, DataBuffer.TYPE_USHORT,
or DataBuffer.TYPE_INT that can hold a single pixel.
bits | the number of bits in the pixel values; for example, the sum of the number of bits in the masks. |
---|---|
rmask | specifies a mask indicating which bits in an integer pixel contain the red component |
gmask | specifies a mask indicating which bits in an integer pixel contain the green component |
bmask | specifies a mask indicating which bits in an integer pixel contain the blue component |
amask | specifies a mask indicating which bits in an integer pixel contain the alpha component |
Constructs a DirectColorModel
from the specified
parameters. Color components are in the specified
ColorSpace
, which must be of type ColorSpace.TYPE_RGB
and have minimum normalized component values which are all 0.0
and maximum values which are all 1.0.
The masks specify which bits in an int
pixel
representation contain the red, green and blue color samples and
the alpha sample, if present. If amask
is 0, pixel
values do not contain alpha information and all pixels are treated
as opaque, which means that alpha = 1.0. All of the
bits in each mask must be contiguous and fit in the specified number
of least significant bits of an int
pixel
representation. If there is alpha, the boolean
isAlphaPremultiplied
specifies how to interpret
color and alpha samples in pixel values. If the boolean
is true
, color samples are assumed to have been
multiplied by the alpha sample. The transparency value is
Transparency.OPAQUE, if no alpha is present, or
Transparency.TRANSLUCENT otherwise. The transfer type
is the type of primitive array used to represent pixel values and
must be one of DataBuffer.TYPE_BYTE, DataBuffer.TYPE_USHORT, or
DataBuffer.TYPE_INT.
space | the specified ColorSpace |
---|---|
bits | the number of bits in the pixel values; for example, the sum of the number of bits in the masks. |
rmask | specifies a mask indicating which bits in an integer pixel contain the red component |
gmask | specifies a mask indicating which bits in an integer pixel contain the green component |
bmask | specifies a mask indicating which bits in an integer pixel contain the blue component |
amask | specifies a mask indicating which bits in an integer pixel contain the alpha component |
isAlphaPremultiplied | true if color samples are
premultiplied by the alpha sample; false otherwise |
transferType | the type of array used to represent pixel values |
IllegalArgumentException | if space is not a
TYPE_RGB space or if the min/max normalized component
values are not 0.0/1.0.
|
---|
Forces the raster data to match the state specified in the
isAlphaPremultiplied
variable, assuming the data is
currently correctly described by this ColorModel
. 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 this
ColorModel
with the isAlphaPremultiplied
flag set appropriately. This method will throw a
UnsupportedOperationException
if this transferType is
not supported by this ColorModel
. Since
ColorModel
can be subclassed, subclasses inherit the
implementation of this method and if they don't override it then
they throw an exception if they use an unsupported transferType.
raster | the WritableRaster data |
---|---|
isAlphaPremultiplied | true if the alpha is
premultiplied; false otherwise |
ColorModel
object that represents the
coerced data.UnsupportedOperationException | if this
transferType is not supported by this
color model
|
---|
Creates a WritableRaster
with the specified width and
height that has a data layout (SampleModel
) compatible
with this ColorModel
.
w | the width to apply to the new WritableRaster |
---|---|
h | the height to apply to the new WritableRaster |
WritableRaster
object with the specified
width and height.IllegalArgumentException | if w or h
is less than or equal to zero |
---|
Returns the alpha component for the specified pixel, scaled
from 0 to 255. The pixel value is specified as an int
.
pixel | the specified pixel |
---|
pixel
from 0 to 255.
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
, a ClassCastException
is
thrown. An ArrayIndexOutOfBoundsException
is
thrown if inData
is not large enough to hold a pixel
value for this ColorModel
. Since
DirectColorModel
can be subclassed, subclasses inherit
the implementation of this method and if they don't override it
then they throw an exception if they use an unsupported
transferType
.
If this transferType
is not supported, an
UnsupportedOperationException
is thrown.
inData | the specified pixel |
---|
if inData
is not a primitive array of type transferType |
|
if
inData is not large enough to hold a pixel value
for this ColorModel |
|
if this
tranferType is not supported by this
ColorModel
|
Returns the mask indicating which bits in an int
pixel
representation contain the alpha component.
int
pixel representation contain the alpha sample.
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
.
The returned value is a non pre-multiplied value. Thus, if the
alpha is premultiplied, this method divides it out before returning
the value. If the alpha value is 0, for example, the blue value
is 0.
pixel | the specified pixel |
---|
ColorSpace
.
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
by an array of data elements of type transferType
passed
in as an object reference.
The returned value is a non pre-multiplied value. Thus, if the
alpha is premultiplied, this method divides it out before returning
the value. If the alpha value is 0, for example, the blue value
is 0. If inData
is not a primitive array of type
transferType
, a ClassCastException
is thrown.
An ArrayIndexOutOfBoundsException
is
thrown if inData
is not large enough to hold a pixel
value for this ColorModel
. Since
DirectColorModel
can be subclassed, subclasses inherit
the implementation of this method and if they don't override it
then they throw an exception if they use an unsupported
transferType
.
An UnsupportedOperationException
is
thrown if this transferType
is not supported by this
ColorModel
.
inData | the array containing the pixel value |
---|
ArrayIndexOutOfBoundsException | if inData is not
large enough to hold a pixel value for this color model |
---|---|
ClassCastException | if inData is not a
primitive array of type transferType |
UnsupportedOperationException | if this transferType
is not supported by this color model
|
Returns the mask indicating which bits in an int
pixel
representation contain the blue color component.
int
pixel representation contain the blue color sample.
Returns an array of unnormalized color/alpha components given a pixel
in this ColorModel
. 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
, a ClassCastException
is thrown. An ArrayIndexOutOfBoundsException
is
thrown if pixel
is not large enough to hold a
pixel value for this ColorModel
. If the
components
array is null
, a new
array is allocated. The components
array is returned.
Color/alpha components are stored in the components
array
starting at offset
, even if the array is allocated by
this method. An ArrayIndexOutOfBoundsException
is thrown if the components
array is not
null
and is not large enough to hold all the color and
alpha components, starting at offset
.
Since DirectColorModel
can be subclassed, subclasses
inherit the implementation of this method and if they don't
override it then they throw an exception if they use an unsupported
transferType
.
pixel | the specified pixel |
---|---|
components | the array to receive the color and alpha components of the specified pixel |
offset | the offset into the components array at
which to start storing the color and alpha components |
ClassCastException | if pixel
is not a primitive array of type transferType |
---|---|
ArrayIndexOutOfBoundsException | if
pixel is not large enough to hold a pixel value
for this ColorModel , or if components
is not null and is not large enough to hold all the
color and alpha components, starting at offset |
UnsupportedOperationException | if this
transferType is not supported by this
color model
|
Returns an array of unnormalized color/alpha components given a pixel
in this ColorModel
. The pixel value is specified as an
int
. If the components
array is
null
, a new array is allocated. The
components
array is returned. Color/alpha components are
stored in the components
array starting at
offset
, even if the array is allocated by this method.
An ArrayIndexOutOfBoundsException
is thrown if the
components
array is not null
and is not large
enough to hold all the color and alpha components, starting at
offset
.
pixel | the specified pixel |
---|---|
components | the array to receive the color and alpha components of the specified pixel |
offset | the offset into the components array at
which to start storing the color and alpha components |
Returns a pixel value represented as an int
in this
ColorModel
, given an array of unnormalized color/alpha
components. An ArrayIndexOutOfBoundsException
is
thrown if the components
array is
not large enough to hold all the color and alpha components, starting
at offset
.
components | an array of unnormalized color and alpha components |
---|---|
offset | the index into components at which to
begin retrieving the color and alpha components |
int
pixel value in this
ColorModel
corresponding to the specified components.if
the components array is not large enough to
hold all of the color and alpha components starting at
offset
|
Returns a data element array representation of a pixel in this
ColorModel
, given an array of unnormalized color/alpha
components.
This array can then be passed to the setDataElements
method of a WritableRaster
object.
An ArrayIndexOutOfBoundsException
is thrown if the
components
array
is not large enough to hold all the color and alpha components,
starting at offset. If the obj
variable is
null
, a new array is allocated. If obj
is
not null
, it must be a primitive array
of type transferType
; otherwise, a
ClassCastException
is thrown.
An ArrayIndexOutOfBoundsException
is thrown if
obj
is not large enough to hold a pixel value for this
ColorModel
.
Since DirectColorModel
can be subclassed, subclasses
inherit the implementation of this method and if they don't
override it then they throw an exception if they use an unsupported
transferType
.
components | an array of unnormalized color and alpha components |
---|---|
offset | the index into components at which to
begin retrieving color and alpha components |
obj | the Object representing an array of color
and alpha components |
Object
representing an array of color and
alpha components.if obj
is not a primitive array of type transferType |
|
if
obj is not large enough to hold a pixel value
for this ColorModel or the components
array is not large enough to hold all of the color and alpha
components starting at offset |
|
UnsupportedOperationException | if this
transferType is not supported by this
color model |
Returns a data element array representation of a pixel in this
ColorModel
, given an integer pixel representation in the
default RGB color model.
This array can then be passed to the setDataElements
method of a WritableRaster
object. If the pixel variable
is null
, a new array is allocated. If pixel
is not null
, it must be a primitive array of type
transferType
; otherwise, a
ClassCastException
is thrown. An
ArrayIndexOutOfBoundsException
is
thrown if pixel
is not large enough to hold a pixel
value for this ColorModel
. The pixel array is returned.
Since DirectColorModel
can be subclassed, subclasses
inherit the implementation of this method and if they don't
override it then they throw an exception if they use an unsupported
transferType
.
rgb | the integer pixel representation in the default RGB color model |
---|---|
pixel | the specified pixel |
ColorModel
ClassCastException | if pixel
is not a primitive array of type transferType |
---|---|
ArrayIndexOutOfBoundsException | if
pixel is not large enough to hold a pixel value
for this ColorModel |
UnsupportedOperationException | if this
transferType is not supported by this
ColorModel |
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
.
The returned value is a non pre-multiplied value. Thus, if the
alpha is premultiplied, this method divides it out before returning
the value. If the alpha value is 0, for example, the green value
is 0.
pixel | the specified pixel |
---|
ColorSpace
.
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
by an array of data elements of type transferType
passed
in as an object reference.
The returned value is a non pre-multiplied value. Thus, if the
alpha is premultiplied, this method divides it out before returning
the value. If the alpha value is 0, for example, the green value
is 0. If inData
is not a primitive array of type
transferType
, a ClassCastException
is thrown.
An ArrayIndexOutOfBoundsException
is
thrown if inData
is not large enough to hold a pixel
value for this ColorModel
. Since
DirectColorModel
can be subclassed, subclasses inherit
the implementation of this method and if they don't override it
then they throw an exception if they use an unsupported
transferType
.
An UnsupportedOperationException
is
thrown if this transferType
is not supported by this
ColorModel
.
inData | the array containing the pixel value |
---|
ArrayIndexOutOfBoundsException | if inData is not
large enough to hold a pixel value for this color model |
---|---|
ClassCastException | if inData is not a
primitive array of type transferType |
UnsupportedOperationException | if this transferType
is not supported by this color model
|
Returns the mask indicating which bits in an int
pixel
representation contain the green color component.
int
pixel representation contain the green color sample.
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
, a ClassCastException
is
thrown. An ArrayIndexOutOfBoundsException
is
thrown if inData
is not large enough to hold a pixel
value for this ColorModel
.
The returned value is in a non pre-multiplied format. Thus, if
the alpha is premultiplied, this method divides it out of the
color components. If the alpha value is 0, for example, the color
values is 0. Since DirectColorModel
can be
subclassed, subclasses inherit the implementation of this method
and if they don't override it then
they throw an exception if they use an unsupported
transferType
.
inData | the specified pixel |
---|
UnsupportedOperationException | if this
transferType is not supported by this
ColorModel |
---|
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
.
The returned value is in a non pre-multiplied format. Thus, if
the alpha is premultiplied, this method divides it out of the
color components. If the alpha value is 0, for example, the color
values are each 0.
pixel | the specified 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
.
The returned value is a non pre-multiplied value. Thus, if the
alpha is premultiplied, this method divides it out before returning
the value. If the alpha value is 0, for example, the red value
is 0.
pixel | the specified pixel |
---|
ColorSpace
.
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
by an array of data elements of type transferType
passed
in as an object reference.
The returned value is a non pre-multiplied value. Thus, if the
alpha is premultiplied, this method divides it out before returning
the value. If the alpha value is 0, for example, the red value
is 0.
If inData
is not a primitive array of type
transferType
, a ClassCastException
is
thrown. An ArrayIndexOutOfBoundsException
is
thrown if inData
is not large enough to hold a
pixel value for this ColorModel
. Since
DirectColorModel
can be subclassed, subclasses inherit
the implementation of this method and if they don't override it
then they throw an exception if they use an unsupported
transferType
.
An UnsupportedOperationException
is thrown if this
transferType
is not supported by this
ColorModel
.
inData | the array containing the pixel value |
---|
ArrayIndexOutOfBoundsException | if inData is not
large enough to hold a pixel value for this color model |
---|---|
ClassCastException | if inData is not a
primitive array of type transferType |
UnsupportedOperationException | if this transferType
is not supported by this color model
|
Returns the mask indicating which bits in an int
pixel
representation contain the red color component.
int
pixel representation contain the red color sample.
Returns true
if raster
is compatible
with this ColorModel
and false
if it is
not.
raster | the Raster object to test for compatibility |
---|
true
if raster
is compatible
with this ColorModel
; false
otherwise.
Returns a String
that represents this
DirectColorModel
.
String
representing this
DirectColorModel
.