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package org.eclipse.swt.graphics;
/*
* Licensed Materials - Property of IBM,
* (c) Copyright IBM Corp. 1998, 2001 All Rights Reserved
*/
import org.eclipse.swt.*;
/**
* Instances of this class describe the color data used by an image.
* <p>
* Depending on the depth of the image, the PaletteData can take one
* of two forms, indicated by the isDirect field:
* </p>
* <dl>
* <dt>
* <em>isDirect is false</em>
* </dt>
* <dd>
* If isDirect is <code>false</code>, this palette is an indexed
* palette which maps pixel values to RGBs. The actual RGB values
* may be retrieved by using the getRGBs() method.
* </dd>
* <dt>
* <em>isDirect is true</em>
* </dt>
* <dd>
* If isDirect is <code>true</code>, 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.
* <p>
* 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.
* </p>
* </dd>
* </dl>
*
* @see Image
* @see RGB
*/
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