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17 lines
474 B
C
17 lines
474 B
C
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// SPDX-License-Identifier: GPL-2.0
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#ifndef INTERPOLATE_H
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#define INTERPOLATE_H
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/* Linear interpolation between 'a' and 'b', when we are 'part'way into the 'whole' distance from a to b */
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static inline int interpolate(int a, int b, int part, int whole)
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{
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/* It is doubtful that we actually need floating point for this, but whatever */
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if (whole) {
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double x = (double)a * (whole - part) + (double)b * part;
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return (int)lrint(x / whole);
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}
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return (a+b)/2;
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}
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#endif
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