Class PackedColorModel

Implemented Interfaces:
Known Direct Subclasses:

public abstract class PackedColorModel
extends ColorModel

Field Summary

Fields inherited from class java.awt.image.ColorModel

pixel_bits, transferType

Fields inherited from interface java.awt.Transparency


Constructor Summary

PackedColorModel(ColorSpace cspace, int pixelBits, int rmask, int gmask, int bmask, int amask, boolean isAlphaPremultiplied, int transparency, int transferType)
PackedColorModel(ColorSpace cspace, int pixelBits, int[] colorMaskArray, int alphaMask, boolean isAlphaPremultiplied, int transparency, int transferType)

Method Summary

createCompatibleSampleModel(int w, int h)
equals(Object obj)
Determine whether this Object is semantically equal to another Object.
getAlphaRaster(WritableRaster raster)
Subclasses must override this method if it is possible for the color model to have an alpha channel.
getMask(int index)
isCompatibleSampleModel(SampleModel sm)

Methods inherited from class java.awt.image.ColorModel

coerceData, coerceDataWorker, createCompatibleSampleModel, createCompatibleWritableRaster, equals, finalize, getAlpha, getAlpha, getAlphaRaster, getBlue, getBlue, getColorSpace, getComponentSize, getComponentSize, getComponents, getComponents, getDataElement, getDataElement, getDataElements, getDataElements, getDataElements, getGreen, getGreen, getNormalizedComponents, getNormalizedComponents, getNumColorComponents, getNumComponents, getPixelSize, getRGB, getRGB, getRGBdefault, getRed, getRed, getTransferType, getTransparency, getUnnormalizedComponents, hasAlpha, isAlphaPremultiplied, isCompatibleRaster, isCompatibleSampleModel, toString

Methods inherited from class java.lang.Object

clone, equals, extends Object> getClass, finalize, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details


public PackedColorModel(ColorSpace cspace,
                        int pixelBits,
                        int rmask,
                        int gmask,
                        int bmask,
                        int amask,
                        boolean isAlphaPremultiplied,
                        int transparency,
                        int transferType)


public PackedColorModel(ColorSpace cspace,
                        int pixelBits,
                        int[] colorMaskArray,
                        int alphaMask,
                        boolean isAlphaPremultiplied,
                        int transparency,
                        int transferType)

Method Details


public SampleModel createCompatibleSampleModel(int w,
                                               int h)
createCompatibleSampleModel in interface ColorModel


public boolean equals(Object obj)
Determine whether this Object is semantically equal to another Object.

There are some fairly strict requirements on this method which subclasses must follow:

  • It must be transitive. If a.equals(b) and b.equals(c), then a.equals(c) must be true as well.
  • It must be symmetric. a.equals(b) and b.equals(a) must have the same value.
  • It must be reflexive. a.equals(a) must always be true.
  • It must be consistent. Whichever value a.equals(b) returns on the first invocation must be the value returned on all later invocations.
  • a.equals(null) must be false.
  • It must be consistent with hashCode(). That is, a.equals(b) must imply a.hashCode() == b.hashCode(). The reverse is not true; two objects that are not equal may have the same hashcode, but that has the potential to harm hashing performance.

This is typically overridden to throw a ClassCastException if the argument is not comparable to the class performing the comparison, but that is not a requirement. It is legal for a.equals(b) to be true even though a.getClass() != b.getClass(). Also, it is typical to never cause a NullPointerException.

In general, the Collections API (java.util) use the equals method rather than the == operator to compare objects. However, IdentityHashMap is an exception to this rule, for its own good reasons.

The default implementation returns this == o.

equals in interface ColorModel
obj - the Object to compare to
whether this Object is semantically equal to another


public WritableRaster getAlphaRaster(WritableRaster raster)
Subclasses must override this method if it is possible for the color model to have an alpha channel.
getAlphaRaster in interface ColorModel
null, as per JDK 1.3 doc. Subclasses will only return null if no alpha raster exists.


public final int getMask(int index)


public final int[] getMasks()


public boolean isCompatibleSampleModel(SampleModel sm)
isCompatibleSampleModel in interface ColorModel

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