IMG/IMG_RasterSpan.h

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#ifndef __IMG_RasterSpan__
#define __IMG_RasterSpan__

#include "IMG_API.h"
//
// This class a takes raster and creates a "span" data structure that holds
// all spans where alpha is 0.
//
// The access methods will take an arbitrary pixel and then return the
// closest pixel which has an alpha value of 0.
//
// The class could be expanded to create spans based upon different criteria.
//

#include        <stdio.h>

class IMG_Raster;
class IMG_Bucket;

class IMG_API IMG_RasterSpan
{
public:
                         IMG_RasterSpan(IMG_Raster *, unsigned long min = 0,
                                              unsigned long max = 0);
                        ~IMG_RasterSpan();

    int                  getClosest(
                                int scan_line,
                                int pixel,
                                int &x);
    int                  getClosest(
                                int x,
                                int y,
                                float max,
                                int &tx,
                                int &ty,
                                float &dist,
                                float min = -1);

    void                 print(FILE *);

private:
    void                 buildSpan(IMG_Raster *);
    void                 cleanBuckets();
    void                 addBuckets(int num_buckets);

    IMG_Bucket          *myBuckets;
    int                  myBucketCount;

    float               *myDist;
    int                  myDistDim;
    unsigned long        myMin;
    unsigned long        myMax;
};

#endif // __IMG_Span__

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