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Diffstat (limited to 'core/interpolate.h')
| -rw-r--r-- | core/interpolate.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/core/interpolate.h b/core/interpolate.h new file mode 100644 index 000000000..acb213acd --- /dev/null +++ b/core/interpolate.h @@ -0,0 +1,16 @@ +// 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 |