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/*
* Modification History
*
* 2000-December-21 Jason Rohrer
* Created.
*/
#ifndef THRESHOLD_FILTER_INCLUDED
#define THRESHOLD_FILTER_INCLUDED
#include "minorGems/graphics/ChannelFilter.h"
/**
* Threshold filter.
*
* @author Jason Rohrer
*/
class ThresholdFilter : public ChannelFilter {
public:
/**
* Constructs a threshold filter.
*
* @param inThreshold threshold value. Channel values
* above or equal to inThreshold are set to 1, while
* all other values are set to 0.
*/
ThresholdFilter( double inThreshold );
/**
* Sets the threshold.
*
* @param inThreshold threshold value. Channel values
* above or equal to inThreshold are set to 1, while
* all other values are set to 0.
*/
void setThreshold( double inThreshold );
// implements the ChannelFilter interface
void apply( double *inChannel, int inWidth, int inHeight );
private:
double mThreshold;
};
inline ThresholdFilter::ThresholdFilter( double inThreshold )
: mThreshold( inThreshold ) {
}
inline void ThresholdFilter::setThreshold( double inThreshold ) {
mThreshold = inThreshold;
}
inline void ThresholdFilter::apply( double *inChannel,
int inWidth, int inHeight ) {
int numPixels = inWidth * inHeight;
for( int i=0; i<numPixels; i++ ) {
if( inChannel[i] >= mThreshold ) {
inChannel[i] = 1.0;
}
else {
inChannel[i] = 0.0;
}
}
}
#endif
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