spline.h

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/* This code is based upon work that bore the legend:
 *
 * Copyright (C) 1997 David Mosberger
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */
 
#pragma once
 
#include "ardour/libardour_visibility.h"
 
#include <cstdint>
 
#ifdef __cplusplus
extern "C" {
#endif
 
typedef struct _spline Spline;
typedef struct _spline_point SplinePoint;
 
struct LIBARDOUR_API _spline_point
{
        float x;
        float y;
};
 
Spline *spline_new (void);
void    spline_free (Spline *);
 
void    spline_set (Spline *, uint32_t n, SplinePoint *);
void    spline_add (Spline *, uint32_t n, SplinePoint *);
void    spline_solve (Spline *);
float   spline_eval (Spline *, float val);
void    spline_fill (Spline *, float x0, float x1, float *vec, uint32_t veclen);
float   spline_get_max_x (Spline *);
float   spline_get_min_x (Spline *);
 
struct LIBARDOUR_API _spline
{
        float        *deriv2;
        float        *x;
        float        *y;
        float         max_x;
        float         min_x;
        SplinePoint  *points;
        uint32_t      npoints;
        uint32_t      space;
 
#ifdef  __cplusplus
 
        void set (uint32_t n, SplinePoint *points) {
                spline_set (this, n, points);
        }
 
        void add (uint32_t n, SplinePoint *points) {
                spline_add (this, n, points);
        }
 
        void solve () {
                spline_solve (this);
        }
 
        float eval (float val) {
                return spline_eval (this, val);
        }
 
        void fill (float x0, float x1, float *vec, uint32_t veclen) {
                spline_fill (this, x0, x1, vec, veclen);
        }
 
#endif /* __cplusplus */
 
};
 
 
#ifdef __cplusplus
}
#endif