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org.eclipse.swt.graphics
Class PaletteData  

java.lang.Object
  org.eclipse.swt.graphics.PaletteData

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public final class PaletteData

extends java.lang.Object

Instances of this class describe the color data used by an image.

Depending on the depth of the image, the PaletteData can take one of two forms, indicated by the isDirect field:

isDirect is false

If isDirect is false, this palette is an indexed palette which maps pixel values to RGBs. The actual RGB values may be retrieved by using the getRGBs() method.

isDirect is true

If isDirect is true, this palette is a direct color palette. Instead of containing RGB values, it contains red, green and blue mask and shift information which indicates how the color components may be extracted from a given pixel. This means that the RGB value is actually encoded in the pixel value.

In this case, the shift data is the number of bits required to shift the RGB value to the left in order to align the high bit of the corresponding mask with the high bit of the first byte. This number may be negative, so care must be taken when shifting. For example, with a red mask of 0xFF0000, the red shift would be -16. With a red mask of 0x1F, the red shift would be 3.

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Field Summary
int	blueMask           the blue mask for a direct palette
int	blueShift           the blue shift for a direct palette
RGB[]	colors           the RGB values for an indexed palette, where the indices of the array correspond to pixel values
int	greenMask           the green mask for a direct palette
int	greenShift           the green shift for a direct palette
boolean	isDirect           true if the receiver is a direct palette, and false otherwise
int	redMask           the red mask for a direct palette
int	redShift           the red shift for a direct palette

 

Constructor Summary

PaletteData(int redMask, int greenMask, int blueMask)           Constructs a new direct palette given the red, green and blue masks.

PaletteData(RGB[] colors)           Constructs a new indexed palette given an array of RGB values.

 

Method Summary
int	getPixel(RGB rgb)           Returns the pixel value corresponding to the given RBG.
RGB	getRGB(int pixel)           Returns an RGB corresponding to the given pixel value.
RGB[]	getRGBs()           Returns all the RGB values in the receiver if it is an indexed palette, or null if it is a direct palette.
(package private)  int	shiftForMask(int mask)           Computes the shift value for a given mask.

 

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

 

Field Detail

isDirect

public boolean isDirect

true if the receiver is a direct palette, and false otherwise

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colors

public RGB[] colors

the RGB values for an indexed palette, where the indices of the array correspond to pixel values

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redMask

public int redMask

the red mask for a direct palette

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greenMask

public int greenMask

the green mask for a direct palette

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blueMask

public int blueMask

the blue mask for a direct palette

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redShift

public int redShift

the red shift for a direct palette

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greenShift

public int greenShift

the green shift for a direct palette

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blueShift

public int blueShift

the blue shift for a direct palette

Constructor Detail

PaletteData

public PaletteData(RGB[] colors)

Constructs a new indexed palette given an array of RGB values.

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PaletteData

public PaletteData(int redMask,
                   int greenMask,
                   int blueMask)

Constructs a new direct palette given the red, green and blue masks.

Method Detail

getPixel

public int getPixel(RGB rgb)

Returns the pixel value corresponding to the given RBG.

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getRGB

public RGB getRGB(int pixel)

Returns an RGB corresponding to the given pixel value.

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getRGBs

public RGB[] getRGBs()

Returns all the RGB values in the receiver if it is an indexed palette, or null if it is a direct palette.

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shiftForMask

int shiftForMask(int mask)

Computes the shift value for a given mask.

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