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java.lang.Object | +--java.awt.image.ColorModel | +--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.
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 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.
ColorModel
,
ColorModel.getRGBdefault()
Fields inherited from class java.awt.image.ColorModel |
pixel_bits |
Constructor Summary | |
DirectColorModel(int bits,
int rmask,
int gmask,
int bmask)
Constructs a DirectColorModel from the specified masks
that indicate which bits in an int pixel representation
contain the red, green and blue color samples. |
|
DirectColorModel(int bits,
int rmask,
int gmask,
int bmask,
int amask)
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. |
Method Summary | |
int |
getAlpha(int pixel)
Returns the alpha component for the specified pixel, scaled from 0 to 255. |
int |
getAlphaMask()
Returns the mask indicating which bits in an int pixel
representation contain the alpha component. |
int |
getBlue(int pixel)
Returns the blue color component for the specified pixel, scaled from 0 to 255 in the default RGB. |
int |
getBlueMask()
Returns the mask indicating which bits in an int pixel
representation contain the blue color component. |
int |
getGreen(int pixel)
Returns the green color component for the specified pixel, scaled from 0 to 255 in the default RGB. |
int |
getGreenMask()
Returns the mask indicating which bits in an int pixel
representation contain the green color component. |
int |
getRed(int pixel)
Returns the red color component for the specified pixel, scaled from 0 to 255 in the default RGB. |
int |
getRedMask()
Returns the mask indicating which bits in an int pixel
representation contain the red color component. |
int |
getRGB(int pixel)
Returns the color/alpha components of the pixel in the default RGB color model format. |
java.lang.String |
toString()
Returns a String that represents this
DirectColorModel . |
Methods inherited from class java.awt.image.ColorModel |
equals, finalize, getPixelSize, getRGBdefault, hasAlpha, hashCode, isAlphaPremultiplied |
Methods inherited from class java.lang.Object |
getClass, notify, notifyAll, wait, wait, wait |
Constructor Detail |
public DirectColorModel(int bits, int rmask, int gmask, int bmask)
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 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 componentgmask
- specifies a mask indicating which bits in an
integer pixel contain the green componentbmask
- specifies a mask indicating which bits in an
integer pixel contain the blue componentpublic DirectColorModel(int bits, int rmask, int gmask, int bmask, int amask)
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 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 componentgmask
- specifies a mask indicating which bits in an
integer pixel contain the green componentbmask
- specifies a mask indicating which bits in an
integer pixel contain the blue componentamask
- specifies a mask indicating which bits in an
integer pixel contain the alpha componentMethod Detail |
public final int getRedMask()
int
pixel
representation contain the red color component.int
pixel representation contain the red color sample.public final int getGreenMask()
int
pixel
representation contain the green color component.int
pixel representation contain the green color sample.public final int getBlueMask()
int
pixel
representation contain the blue color component.int
pixel representation contain the blue color sample.public final int getAlphaMask()
int
pixel
representation contain the alpha component.int
pixel representation contain the alpha sample.public final int getRed(int pixel)
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.getRed
in class ColorModel
pixel
- the specified pixelpublic final int getGreen(int pixel)
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.getGreen
in class ColorModel
pixel
- the specified pixelpublic final int getBlue(int pixel)
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.getBlue
in class ColorModel
pixel
- the specified pixelpublic final int getAlpha(int pixel)
int
.getAlpha
in class ColorModel
pixel
- the specified pixelpixel
from 0 to 255.public final int getRGB(int pixel)
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.getRGB
in class ColorModel
pixel
- the specified pixelColorModel.getRGBdefault()
public java.lang.String toString()
String
that represents this
DirectColorModel
.toString
in class ColorModel
String
representing this
DirectColorModel
.
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