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org.ydp.jai
Class FloatDoubleColorModel  

java.lang.Object
  java.awt.image.ColorModel
      java.awt.image.ComponentColorModel
          org.ydp.jai.FloatDoubleColorModel

All Implemented Interfaces:

java.awt.Transparency

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public class FloatDoubleColorModel

extends java.awt.image.ComponentColorModel

A ColorModel class that works with pixel values that represent color and alpha information as separate samples, using float or double elements. This class can be used with an arbitrary ColorSpace. The number of color samples in the pixel values must be same as the number of color components in the ColorSpace. There may be a single alpha sample.

Sample values are taken as ranging from 0.0 to 1.0; that is, when converting to 8-bit RGB, a multiplication by 255 is performed and values outside of the range 0-255 are clamped at the closest endpoint.

For maximum efficiency, pixel data being interpreted by this class should be in the sRGB color space. This will result in only the trivial conversion (scaling by 255 and dividing by any premultiplied alpha) to be performed. Other color spaces require more general conversions.

For those methods that use a primitive array pixel representation of type transferType, the array length is the same as the number of color and alpha samples. Color samples are stored first in the array followed by the alpha sample, if present. The order of the color samples is specified by the ColorSpace. 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. The transfer types supported are DataBuffer.TYPE_FLOAT, DataBuffer.TYPE_DOUBLE.

The translation from pixel values to color/alpha components for display or processing purposes is a one-to-one correspondence of samples to components.

Methods that use a single int pixel representation throw an IllegalArgumentException.

A FloatDoubleColorModel can be used in conjunction with a ComponentSampleModelJAI.

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Field Summary
(package private)  java.awt.color.ColorSpace	colorSpace
(package private)  int	colorSpaceType
(package private)  boolean	hasAlpha
(package private)  boolean	isAlphaPremultiplied
(package private)  int	numColorComponents
(package private)  int	numComponents
(package private)  int	transparency

 

Fields inherited from class java.awt.image.ColorModel

pixel_bits, transferType

 

Fields inherited from interface java.awt.Transparency

BITMASK, OPAQUE, TRANSLUCENT

 

Constructor Summary

FloatDoubleColorModel(java.awt.color.ColorSpace colorSpace, boolean hasAlpha, boolean isAlphaPremultiplied, int transparency, int transferType)           Constructs a ComponentColorModel from the specified parameters.

 

Method Summary
private static int[]	bitsHelper(int transferType, java.awt.color.ColorSpace colorSpace, boolean hasAlpha)
private  int	clamp(double value)
private  int	clamp(float value)
java.awt.image.ColorModel	coerceData(java.awt.image.WritableRaster raster, boolean isAlphaPremultiplied)           Forces the raster data to match the state specified in the isAlphaPremultiplied variable, assuming the data is currently correctly described by this ColorModel.
java.awt.image.SampleModel	createCompatibleSampleModel(int w, int h)           Creates a SampleModel with the specified width and height that has a data layout compatible with this ColorModel.
java.awt.image.WritableRaster	createCompatibleWritableRaster(int w, int h)           Creates a WritableRaster with the specified width and height, that has a data layout (SampleModel) compatible with this ColorModel.
int	getAlpha(int pixel)           Throws an IllegalArgumentException, since pixel values for this ColorModel are not conveniently representable as a single int.
int	getAlpha(java.lang.Object inData)           Returns the alpha component for the specified pixel, scaled from 0 to 255.
int	getBlue(int pixel)           Throws an IllegalArgumentException, since pixel values for this ColorModel are not conveniently representable as a single int.
int	getBlue(java.lang.Object inData)           Returns the blue color component for the specified pixel, scaled from 0 to 255 in the default RGB ColorSpace, sRGB.
int[]	getComponents(int pixel, int[] components, int offset)           Throws an IllegalArgumentException, since pixel values for this ColorModel are not conveniently representable as a single int.
int[]	getComponents(java.lang.Object pixel, int[] components, int offset)           Throws an IllegalArgumentException since the pixel values cannot be placed into an int array.
int	getDataElement(int[] components, int offset)           Throws an IllegalArgumentException, since pixel values for this ColorModel are not conveniently representable as a single int.
java.lang.Object	getDataElements(int[] components, int offset, java.lang.Object obj)           Returns a data element array representation of a pixel in this ColorModel, given an array of unnormalized color/alpha components.
java.lang.Object	getDataElements(int rgb, java.lang.Object pixel)           Returns a data element array representation of a pixel in this ColorModel, given an integer pixel representation in the default RGB color model.
int	getGreen(int pixel)           Throws an IllegalArgumentException, since pixel values for this ColorModel are not conveniently representable as a single int.
int	getGreen(java.lang.Object inData)           Returns the green color component for the specified pixel, scaled from 0 to 255 in the default RGB ColorSpace, sRGB.
int	getRed(int pixel)           Throws an IllegalArgumentException, since pixel values for this ColorModel are not conveniently representable as a single int.
int	getRed(java.lang.Object inData)           Returns the red color component for the specified pixel, scaled from 0 to 255 in the default RGB ColorSpace, sRGB.
int	getRGB(int pixel)           Throws an IllegalArgumentException, since pixel values for this ColorModel are not conveniently representable as a single int.
int	getRGB(java.lang.Object inData)           Returns the color/alpha components for the specified pixel in the default RGB color model format.
private  int	getSample(java.lang.Object inData, int sample)
boolean	isCompatibleRaster(java.awt.image.Raster raster)           Returns true if the supplied Raster's SampleModel is compatible with this FloatDoubleColorModel.
boolean	isCompatibleSampleModel(java.awt.image.SampleModel sm)           Checks whether or not the specified SampleModel is compatible with this ColorModel.
java.lang.String	toString()           Returns a String containing the values of all valid fields.

 

Methods inherited from class java.awt.image.ComponentColorModel

equals, getAlphaRaster

 

Methods inherited from class java.awt.image.ColorModel

finalize, getColorSpace, getComponentSize, getComponentSize, getDataElement, getDataElements, getNormalizedComponents, getNormalizedComponents, getNumColorComponents, getNumComponents, getPixelSize, getRGBdefault, getTransferType, getTransparency, getUnnormalizedComponents, hasAlpha, isAlphaPremultiplied

 

Methods inherited from class java.lang.Object

clone, getClass, hashCode, notify, notifyAll, wait, wait, wait

 

Field Detail

colorSpace

java.awt.color.ColorSpace colorSpace

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colorSpaceType

int colorSpaceType

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numColorComponents

int numColorComponents

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numComponents

int numComponents

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transparency

int transparency

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hasAlpha

boolean hasAlpha

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isAlphaPremultiplied

boolean isAlphaPremultiplied

Constructor Detail

FloatDoubleColorModel

public FloatDoubleColorModel(java.awt.color.ColorSpace colorSpace,
                             boolean hasAlpha,
                             boolean isAlphaPremultiplied,
                             int transparency,
                             int transferType)

Constructs a ComponentColorModel from the specified parameters. Color components will be in the specified ColorSpace. hasAlpha indicates whether alpha information is present. If hasAlpha is true, then 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 specifies what alpha values can be represented by this color model. The transferType is the type of primitive array used to represent pixel values.

Method Detail

bitsHelper

private static int[] bitsHelper(int transferType,
                                java.awt.color.ColorSpace colorSpace,
                                boolean hasAlpha)

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getRed

public int getRed(int pixel)

Throws an IllegalArgumentException, since pixel values for this ColorModel are not conveniently representable as a single int.

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getGreen

public int getGreen(int pixel)

Throws an IllegalArgumentException, since pixel values for this ColorModel are not conveniently representable as a single int.

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getBlue

public int getBlue(int pixel)

Throws an IllegalArgumentException, since pixel values for this ColorModel are not conveniently representable as a single int.

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getAlpha

public int getAlpha(int pixel)

Throws an IllegalArgumentException, since pixel values for this ColorModel are not conveniently representable as a single int.

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getRGB

public int getRGB(int pixel)

Throws an IllegalArgumentException, since pixel values for this ColorModel are not conveniently representable as a single int.

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clamp

private int clamp(float value)

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clamp

private int clamp(double value)

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getSample

private int getSample(java.lang.Object inData,
                      int sample)

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getRed

public int getRed(java.lang.Object inData)

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 will be a non pre-multiplied value. If the alpha is premultiplied, this method divides it out before returning the value (if the alpha value is 0, the red value will be 0).

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getGreen

public int getGreen(java.lang.Object inData)

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 will be a non pre-multiplied value. If the alpha is premultiplied, this method divides it out before returning the value (if the alpha value is 0, the green value will be 0).

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getBlue

public int getBlue(java.lang.Object inData)

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 will be a non pre-multiplied value. 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).

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getAlpha

public int getAlpha(java.lang.Object inData)

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 the ColorModel does not have alpha, 255 is returned.

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getRGB

public int getRGB(java.lang.Object inData)

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. The returned value is in a non pre-multiplied format. If the alpha is premultiplied, this method divides it out of the color components (if the alpha value is 0, the color values will be 0).

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getDataElements

public java.lang.Object getDataElements(int rgb,
                                        java.lang.Object pixel)

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 parameter is null, a new array is allocated.

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getComponents

public int[] getComponents(int pixel,
                           int[] components,
                           int offset)

Throws an IllegalArgumentException, since pixel values for this ColorModel are not conveniently representable as a single int.

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getComponents

public int[] getComponents(java.lang.Object pixel,
                           int[] components,
                           int offset)

Throws an IllegalArgumentException since the pixel values cannot be placed into an int array.

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getDataElement

public int getDataElement(int[] components,
                          int offset)

Throws an IllegalArgumentException, since pixel values for this ColorModel are not conveniently representable as a single int.

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getDataElements

public java.lang.Object getDataElements(int[] components,
                                        int offset,
                                        java.lang.Object obj)

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.

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coerceData

public java.awt.image.ColorModel coerceData(java.awt.image.WritableRaster raster,
                                            boolean isAlphaPremultiplied)

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 also returns an instance of FloatDoubleColorModel with the isAlphaPremultiplied flag set appropriately.

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isCompatibleRaster

public boolean isCompatibleRaster(java.awt.image.Raster raster)

Returns true if the supplied Raster's SampleModel is compatible with this FloatDoubleColorModel.

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createCompatibleWritableRaster

public java.awt.image.WritableRaster createCompatibleWritableRaster(int w,
                                                                    int h)

Creates a WritableRaster with the specified width and height, that has a data layout (SampleModel) compatible with this ColorModel. The returned WritableRaster's SampleModel will be an instance of ComponentSampleModel.

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createCompatibleSampleModel

public java.awt.image.SampleModel createCompatibleSampleModel(int w,
                                                              int h)

Creates a SampleModel with the specified width and height that has a data layout compatible with this ColorModel. The returned SampleModel will be an instance of ComponentSampleModel.

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isCompatibleSampleModel

public boolean isCompatibleSampleModel(java.awt.image.SampleModel sm)

Checks whether or not the specified SampleModel is compatible with this ColorModel. A SampleModel is compatible if it is an instance of ComponentSampleModel, has the sample number of bands as the total nomber of components (including alpha) in the ColorSpace used by this ColorModel, and has the same data type (float or double) as this ColorModel.

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toString

public java.lang.String toString()

Returns a String containing the values of all valid fields.

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Overview  Package   Class  Use  Deprecated  Index
Home >> All >> org >> ydp >> [ jai overview ]	PREV CLASS  NEXT CLASS
SUMMARY:  JAVADOC |  SOURCE |  DOWNLOAD | NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

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