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cleanup: move interpolate inline function to its own header file

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This is not really related to struct dive, so let's move it.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
This commit is contained in:
Berthold Stoeger 2020-10-25 18:14:23 +01:00 • committed by Dirk Hohndel
parent f9c3227975
commit f728923c79
8 changed files with 22 additions and 11 deletions
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16
core/interpolate.h Normal file
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// SPDX-License-Identifier: GPL-2.0
#ifndef INTERPOLATE_H
#define INTERPOLATE_H
/* Linear interpolation between 'a' and 'b', when we are 'part'way into the 'whole' distance from a to b */
static inline int interpolate(int a, int b, int part, int whole)
{
/* It is doubtful that we actually need floating point for this, but whatever */
if (whole) {
double x = (double)a * (whole - part) + (double)b * part;
return (int)lrint(x / whole);
}
return (a+b)/2;
}
#endif