alphacurve.h

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#ifndef _ALPHACURVE_H_
#define _ALPHACURVE_H_

#include <math.h>

//query = requested pixel alpha                 any
//maxrez x = width of the image in pixels               any
//min = minimum alpha                       min 0
//max = maximum alpha                       max 255
//focus = multiplier of focus center for curve          0-1
//concavity = multiplier from linear -> terminal(0 or 255)  0-1
//tail_mode_start = overriding slope value for start        negative = standard, 0=flat, high=vertical
//tail_mode_end = overriding slope value for start      negative = standard, 0=flat, high=vertical

int get_alpha( int _query,
               int _maxrez_x,
               int _min,
               int _max,
               double _focus,
               double _concavity,
               int _tail_mode_start,
               int _tail_mode_end );

#endif