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java.lang.Object org.eclipse.swt.graphics.PaletteData
public final class PaletteData
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:
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.
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.
Image
,
RGB
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 RGB . |
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. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
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public boolean isDirect
public RGB[] colors
public int redMask
public int greenMask
public int blueMask
public int redShift
public int greenShift
public int blueShift
Constructor Detail |
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public PaletteData(RGB[] colors)
colors
- the array of RGB
s for the palette
java.lang.IllegalArgumentException
- public PaletteData(int redMask, int greenMask, int blueMask)
redMask
- the red maskgreenMask
- the green maskblueMask
- the blue maskMethod Detail |
---|
public int getPixel(RGB rgb)
RGB
.
rgb
- the RGB to get the pixel value for
java.lang.IllegalArgumentException
- public RGB getRGB(int pixel)
RGB
corresponding to the given pixel value.
pixel
- the pixel to get the RGB value for
java.lang.IllegalArgumentException
- public RGB[] getRGBs()
RGB
s for the receiver or null
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