IlvFixedQuantizer Class Reference

Fixed Colormap Quantizer base class. More...

#include <ilviews/bitmaps/fixquant.h>

Inheritance diagram for IlvFixedQuantizer:

Public Member Functions
	IlvFixedQuantizer (IlvColorMap *cmap=0)
	Constructor. More...
	~IlvFixedQuantizer ()
	Destructor. More...
IlvColorMap *	computeColorMap (const IlvBitmapData *data, IlUInt numcolors)
	Returns the colormap. More...
Public Member Functions inherited from IlvQuantizer
virtual IlBoolean	hasDithering () const
	Returns whether the instance uses Floyd-Steinberg dithering. More...
virtual IlvIndexedBitmapData *	quantize (const IlvBitmapData *data, IlUInt numcols)
	Creates indexed bitmap data from true color bitmap data using the requested number of colors (this number can be ignored by the actual quantizer). The default implementation calls computeColorMap and then remap. More...
virtual IlvIndexedBitmapData *	remap (const IlvBitmapData *data, const IlvColorMap *colormap, IlBoolean fsdither=IlTrue)
	Remaps the true colors to the indexed colors. More...
void	setDithering (IlBoolean dither)
	Sets whether the instance uses Floyd-Steinberg dithering. More...

Detailed Description

Fixed Colormap Quantizer base class.

Library: xviews or winviews or mviews (mutually exclusive)

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

Constructor & Destructor Documentation

IlvFixedQuantizer::IlvFixedQuantizer

(

IlvColorMap *

cmap = 0

)

Constructor.

Parameters

cmap	The colormap to use.

IlvFixedQuantizer::~IlvFixedQuantizer

(

)

Destructor.

The default implementation unlocks the colormap.

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.