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Add conversion from float to fixed-point i16

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To encode float values between -1 and 1.

PR #3369 <https://github.com/Genymobile/scrcpy/pull/3369>
This commit is contained in:
Romain Vimont 2022-08-03 13:04:15 +02:00
parent 1ab6c19486
commit 1f138aef41
4 changed files with 68 additions and 0 deletions
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15
app/src/util/binary.h
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@ -58,4 +58,19 @@ sc_float_to_u16fp(float f) {
return (uint16_t) u;
}
/**
* Convert a float between -1 and 1 to a signed 16-bit fixed-point value
*/
static inline int16_t
sc_float_to_i16fp(float f) {
assert(f >= -1.0f && f <= 1.0f);
int32_t i = f * 0x1p15f; // 2^15
assert(i >= -0x8000);
if (i >= 0x7fff) {
assert(i == 0x8000); // for f == 1.0f
i = 0x7fff;
}
return (int16_t) i;
}
#endif