IlvQuickQuantizer Class Reference

332 fixed colormap quantizer class. More...

#include <ilviews/bitmaps/qckquant.h>

Inheritance diagram for IlvQuickQuantizer:

Public Member Functions
	IlvQuickQuantizer ()
	Constructor. The constructor creates the colormap.
IlvIndexedBitmapData *	remap (const IlvBitmapData *data, const IlvColorMap *cmap, IlBoolean dither=IlTrue)
	Converts true colors to the indexed colors. This method is derived because the remapping can be done quickly using simple bit shifts instead of using the general but slow IlvQuantizer::remap() method. More...
Public Member Functions inherited from IlvFixedQuantizer
	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...
void	setDithering (IlBoolean dither)
	Sets whether the instance uses Floyd-Steinberg dithering. More...

Detailed Description

332 fixed colormap quantizer 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). The colormap is computed using 3 bits for red and green and 2 bits for blue.

See also

IlvFixedQuantizer, IlvQuantizer, IlvWUQuantizer, IlvNetscapeQuantizer

Member Function Documentation

remap()

IlvIndexedBitmapData* IlvQuickQuantizer::remap ( const IlvBitmapData *  data, const IlvColorMap *  cmap, IlBoolean  dither = IlTrue  )

virtual

Converts true colors to the indexed colors. This method is derived because the remapping can be done quickly using simple bit shifts instead of using the general but slow IlvQuantizer::remap() method.

Parameters

data	The original true color bitmap data.
cmap	The colormap to remap the bitmap data to.
dither	An IlBoolean value to indicate whether or no to use Floyd-Steinberg error diffusion.

Returns

The computed indexed bitmap data.

Reimplemented from IlvQuantizer.