IlvFixedQuantizer Class Reference

Fixed Colormap Quantizer base class. More...

#include <ilviews/bitmaps/fixquant.h>

Inheritance diagram for IlvFixedQuantizer:

List of all members.

Public Member Functions
	IlvFixedQuantizer (IlvColorMap *cmap=0)
	Constructor.
	~IlvFixedQuantizer ()
	Destructor.
IlvColorMap *	computeColorMap (const IlvBitmapData *data, IlUInt numcolors)
	Returns the colormap.

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Detailed Description

Fixed Colormap Quantizer base class.

Library: display

This class provides methods to convert true color images to indexed images using a fixed colormap (The colormap is not computed from the source image). This class has two subclasses:

• IlvQuickQuantizer to remap to colors well distributed in the color cube (colors are computed using 3 bits for red and green and 2 bits for blue).
• IlvNetscapeQuantizer to remap to the predefined Netscape colormap (it uses 216 colors).

See also:

IlvFixedQuantizer, IlvQuickQuantizer, IlvWUQuantizer, IlvNetscapeQuantizer

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Constructor & Destructor Documentation

IlvFixedQuantizer::IlvFixedQuantizer

(

IlvColorMap *

cmap = 0

)

Constructor.

Parameters:

cmap

The colormap to use.

IlvFixedQuantizer::~IlvFixedQuantizer

(

)

Destructor.

The default implementation unlocks the colormap.

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Member Function Documentation

IlvColorMap* IlvFixedQuantizer::computeColorMap	(	const IlvBitmapData *	data,
		IlUInt	numcolors
	)			[virtual]

Returns the colormap.

Parameters:

	data	The original true color bitmap data.
	numcolors	The requested number of colors, ignored as the colormap is precomputed.

Returns:

The computed colormap.

Implements IlvQuantizer.