FFmpeg
hermite.h
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1 /*
2  * This file is part of FFmpeg.
3  *
4  * FFmpeg is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * FFmpeg is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with FFmpeg; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17  */
18 
19 #ifndef AVFILTER_HERMITE_H
20 #define AVFILTER_HERMITE_H
21 
22 static inline double hermite_interpolation(double x, double x0, double x1,
23  double p0, double p1,
24  double m0, double m1)
25 {
26  double width = x1 - x0;
27  double t = (x - x0) / width;
28  double t2, t3;
29  double ct0, ct1, ct2, ct3;
30 
31  m0 *= width;
32  m1 *= width;
33 
34  t2 = t*t;
35  t3 = t2*t;
36  ct0 = p0;
37  ct1 = m0;
38 
39  ct2 = -3 * p0 - 2 * m0 + 3 * p1 - m1;
40  ct3 = 2 * p0 + m0 - 2 * p1 + m1;
41 
42  return ct3 * t3 + ct2 * t2 + ct1 * t + ct0;
43 }
44 
45 #endif /* AVFILTER_HERMITE_H */
#define t3
Definition: regdef.h:31
static double hermite_interpolation(double x, double x0, double x1, double p0, double p1, double m0, double m1)
Definition: hermite.h:22
#define width
#define t2
Definition: regdef.h:30