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Fix "improved_map" from Servo.cpp and use this is in core implementation.

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Greatly reduces error rate (half, or 0 zero errors, depends on in/out ranges) for round-trip mapping at the same performance.
This commit is contained in:
Dirk O. Kaar 2020-01-21 11:28:14 +01:00
parent 14f627218b
commit 58829022ed
1 changed files with 5 additions and 5 deletions
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10
cores/esp8266/WMath.cpp
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@ -70,11 +70,11 @@ long secureRandom(long howsmall, long howbig) {
}
long map(long x, long in_min, long in_max, long out_min, long out_max) {
long divisor = (in_max - in_min);
if(divisor == 0){
return -1; //AVR returns -1, SAM returns 0
}
return (x - in_min) * (out_max - out_min) / divisor + out_min;
const long dividend = out_max - out_min;
const long divisor = in_max - in_min;
const long delta = x - in_min;
return (delta * dividend + (divisor / 2)) / divisor + out_min;
}
unsigned int makeWord(unsigned int w) {